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https://github.com/moparisthebest/curl
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It turns out that some of the constants necessary to make this feature work are missing from Snow Leopard's Security framework even though they are defined in the headers. Bug: http://curl.haxx.se/mail/lib-2013-11/0076.html Reported by: myriachan
2746 lines
136 KiB
Groff
2746 lines
136 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at http://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH curl_easy_setopt 3 "1 Jan 2010" "libcurl 7.20.0" "libcurl Manual"
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.SH NAME
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curl_easy_setopt \- set options for a curl easy handle
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLoption option, parameter);
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.SH DESCRIPTION
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curl_easy_setopt() is used to tell libcurl how to behave. By using the
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appropriate options to \fIcurl_easy_setopt\fP, you can change libcurl's
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behavior. All options are set with the \fIoption\fP followed by a
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\fIparameter\fP. That parameter can be a \fBlong\fP, a \fBfunction pointer\fP,
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an \fBobject pointer\fP or a \fBcurl_off_t\fP, depending on what the specific
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option expects. Read this manual carefully as bad input values may cause
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libcurl to behave badly! You can only set one option in each function call. A
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typical application uses many curl_easy_setopt() calls in the setup phase.
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Options set with this function call are valid for all forthcoming transfers
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performed using this \fIhandle\fP. The options are not in any way reset
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between transfers, so if you want subsequent transfers with different options,
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you must change them between the transfers. You can optionally reset all
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options back to internal default with \fIcurl_easy_reset(3)\fP.
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Strings passed to libcurl as 'char *' arguments, are copied by the library;
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thus the string storage associated to the pointer argument may be overwritten
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after curl_easy_setopt() returns. Exceptions to this rule are described in
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the option details below.
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Before version 7.17.0, strings were not copied. Instead the user was forced
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keep them available until libcurl no longer needed them.
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The \fIhandle\fP is the return code from a \fIcurl_easy_init(3)\fP or
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\fIcurl_easy_duphandle(3)\fP call.
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.SH BEHAVIOR OPTIONS
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.IP CURLOPT_VERBOSE
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Set the parameter to 1 to get the library to display a lot of verbose
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information about its operations. Very useful for libcurl and/or protocol
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debugging and understanding. The verbose information will be sent to stderr,
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or the stream set with \fICURLOPT_STDERR\fP. The default value for this
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parameter is 0.
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You hardly ever want this set in production use, you will almost always want
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this when you debug/report problems. Another neat option for debugging is the
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\fICURLOPT_DEBUGFUNCTION\fP.
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.IP CURLOPT_HEADER
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A parameter set to 1 tells the library to include the header in the body
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output. This is only relevant for protocols that actually have headers
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preceding the data (like HTTP). The default value for this parameter is 0.
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.IP CURLOPT_NOPROGRESS
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Pass a long. If set to 1, it tells the library to shut off the progress meter
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completely. It will also prevent the \fICURLOPT_PROGRESSFUNCTION\fP from
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getting called. The default value for this parameter is 1.
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Future versions of libcurl are likely to not have any built-in progress meter
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at all.
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.IP CURLOPT_NOSIGNAL
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Pass a long. If it is 1, libcurl will not use any functions that
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install signal handlers or any functions that cause signals to be sent to the
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process. This option is mainly here to allow multi-threaded unix applications
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to still set/use all timeout options etc, without risking getting signals.
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The default value for this parameter is 0.
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(Added in 7.10)
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If this option is set and libcurl has been built with the standard name
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resolver, timeouts will not occur while the name resolve takes place.
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Consider building libcurl with c-ares support to enable asynchronous DNS
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lookups, which enables nice timeouts for name resolves without signals.
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Setting \fICURLOPT_NOSIGNAL\fP to 1 makes libcurl NOT ask the system to ignore
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SIGPIPE signals, which otherwise are sent by the system when trying to send
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data to a socket which is closed in the other end. libcurl makes an effort to
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never cause such SIGPIPEs to trigger, but some operating systems have no way
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to avoid them and even on those that have there are some corner cases when
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they may still happen, contrary to our desire. In addition, using
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\fICURLAUTH_NTLM_WB\fP authentication could cause a SIGCHLD signal to be
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raised.
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.IP CURLOPT_WILDCARDMATCH
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Set this option to 1 if you want to transfer multiple files according to a
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file name pattern. The pattern can be specified as part of the
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\fICURLOPT_URL\fP option, using an fnmatch-like pattern (Shell Pattern
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Matching) in the last part of URL (file name).
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By default, libcurl uses its internal wildcard matching implementation. You
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can provide your own matching function by the \fICURLOPT_FNMATCH_FUNCTION\fP
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option.
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This feature is only supported by the FTP download for now.
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A brief introduction of its syntax follows:
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.RS
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.IP "* - ASTERISK"
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\&ftp://example.com/some/path/\fB*.txt\fP (for all txt's from the root
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directory)
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.RE
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.RS
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.IP "? - QUESTION MARK"
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Question mark matches any (exactly one) character.
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\&ftp://example.com/some/path/\fBphoto?.jpeg\fP
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.RE
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.RS
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.IP "[ - BRACKET EXPRESSION"
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The left bracket opens a bracket expression. The question mark and asterisk have
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no special meaning in a bracket expression. Each bracket expression ends by the
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right bracket and matches exactly one character. Some examples follow:
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\fB[a-zA-Z0\-9]\fP or \fB[f\-gF\-G]\fP \- character interval
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\fB[abc]\fP - character enumeration
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\fB[^abc]\fP or \fB[!abc]\fP - negation
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\fB[[:\fP\fIname\fP\fB:]]\fP class expression. Supported classes are
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\fBalnum\fP,\fBlower\fP, \fBspace\fP, \fBalpha\fP, \fBdigit\fP, \fBprint\fP,
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\fBupper\fP, \fBblank\fP, \fBgraph\fP, \fBxdigit\fP.
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\fB[][-!^]\fP - special case \- matches only '\-', ']', '[', '!' or '^'. These
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characters have no special purpose.
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\fB[\\[\\]\\\\]\fP - escape syntax. Matches '[', ']' or '\\'.
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Using the rules above, a file name pattern can be constructed:
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\&ftp://example.com/some/path/\fB[a-z[:upper:]\\\\].jpeg\fP
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.RE
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.PP
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(This was added in 7.21.0)
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.SH CALLBACK OPTIONS
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.IP CURLOPT_WRITEFUNCTION
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Pass a pointer to a function that matches the following prototype:
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\fBsize_t function( char *ptr, size_t size, size_t nmemb, void *userdata);\fP
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This function gets called by libcurl as soon as there is data received that
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needs to be saved. The size of the data pointed to by \fIptr\fP is \fIsize\fP
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multiplied with \fInmemb\fP, it will not be zero terminated. Return the number
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of bytes actually taken care of. If that amount differs from the amount passed
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to your function, it'll signal an error to the library. This will abort the
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transfer and return \fICURLE_WRITE_ERROR\fP.
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From 7.18.0, the function can return CURL_WRITEFUNC_PAUSE which then will
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cause writing to this connection to become paused. See
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\fIcurl_easy_pause(3)\fP for further details.
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This function may be called with zero bytes data if the transferred file is
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empty.
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Set this option to NULL to get the internal default function. The internal
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default function will write the data to the FILE * given with
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\fICURLOPT_WRITEDATA\fP.
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Set the \fIuserdata\fP argument with the \fICURLOPT_WRITEDATA\fP option.
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The callback function will be passed as much data as possible in all invokes,
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but you cannot possibly make any assumptions. It may be one byte, it may be
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thousands. The maximum amount of body data that can be passed to the write
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callback is defined in the curl.h header file: CURL_MAX_WRITE_SIZE (the usual
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default is 16K). If you however have \fICURLOPT_HEADER\fP set, which sends
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header data to the write callback, you can get up to
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\fICURL_MAX_HTTP_HEADER\fP bytes of header data passed into it. This usually
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means 100K.
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.IP CURLOPT_WRITEDATA
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Data pointer to pass to the file write function. If you use the
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\fICURLOPT_WRITEFUNCTION\fP option, this is the pointer you'll get as
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input. If you don't use a callback, you must pass a 'FILE *' (cast
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to 'void *') as libcurl will pass this to fwrite() when writing data.
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By default, the value of this parameter is unspecified.
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The internal \fICURLOPT_WRITEFUNCTION\fP will write the data to the FILE *
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given with this option, or to stdout if this option hasn't been set.
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If you're using libcurl as a win32 DLL, you \fBMUST\fP use the
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\fICURLOPT_WRITEFUNCTION\fP if you set this option or you will experience
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crashes.
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This option is also known with the older name \fICURLOPT_FILE\fP, the name
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\fICURLOPT_WRITEDATA\fP was introduced in 7.9.7.
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.IP CURLOPT_READFUNCTION
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Pass a pointer to a function that matches the following prototype:
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\fBsize_t function( void *ptr, size_t size, size_t nmemb, void *userdata);\fP
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This function gets called by libcurl as soon as it needs to read data in order
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to send it to the peer. The data area pointed at by the pointer \fIptr\fP may
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be filled with at most \fIsize\fP multiplied with \fInmemb\fP number of
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bytes. Your function must return the actual number of bytes that you stored in
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that memory area. Returning 0 will signal end-of-file to the library and cause
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it to stop the current transfer.
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If you stop the current transfer by returning 0 "pre-maturely" (i.e before the
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server expected it, like when you've said you will upload N bytes and you
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upload less than N bytes), you may experience that the server "hangs" waiting
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for the rest of the data that won't come.
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The read callback may return \fICURL_READFUNC_ABORT\fP to stop the current
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operation immediately, resulting in a \fICURLE_ABORTED_BY_CALLBACK\fP error
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code from the transfer (Added in 7.12.1)
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From 7.18.0, the function can return CURL_READFUNC_PAUSE which then will cause
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reading from this connection to become paused. See \fIcurl_easy_pause(3)\fP
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for further details.
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\fBBugs\fP: when doing TFTP uploads, you must return the exact amount of data
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that the callback wants, or it will be considered the final packet by the
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server end and the transfer will end there.
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If you set this callback pointer to NULL, or don't set it at all, the default
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internal read function will be used. It is doing an fread() on the FILE *
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userdata set with \fICURLOPT_READDATA\fP.
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.IP CURLOPT_READDATA
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Data pointer to pass to the file read function. If you use the
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\fICURLOPT_READFUNCTION\fP option, this is the pointer you'll get as input. If
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you don't specify a read callback but instead rely on the default internal
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read function, this data must be a valid readable FILE * (cast to 'void *').
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If you're using libcurl as a win32 DLL, you MUST use a
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\fICURLOPT_READFUNCTION\fP if you set this option.
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This option was also known by the older name \fICURLOPT_INFILE\fP, the name
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\fICURLOPT_READDATA\fP was introduced in 7.9.7.
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.IP CURLOPT_IOCTLFUNCTION
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Pass a pointer to a function that matches the following prototype:
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\fBcurlioerr function(CURL *handle, int cmd, void *clientp);\fP. This function
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gets called by libcurl when something special I/O-related needs to be done
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that the library can't do by itself. For now, rewinding the read data stream
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is the only action it can request. The rewinding of the read data stream may
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be necessary when doing a HTTP PUT or POST with a multi-pass authentication
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method. By default, this parameter is set to NULL. (Option added in 7.12.3).
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Use \fICURLOPT_SEEKFUNCTION\fP instead to provide seeking! If
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\fICURLOPT_SEEKFUNCTION\fP is set, this parameter will be ignored when seeking.
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.IP CURLOPT_IOCTLDATA
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Pass a pointer that will be untouched by libcurl and passed as the 3rd
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argument in the ioctl callback set with \fICURLOPT_IOCTLFUNCTION\fP.
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By default, the value of this parameter is unspecified. (Option added in
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7.12.3)
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.IP CURLOPT_SEEKFUNCTION
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Pass a pointer to a function that matches the following prototype: \fBint
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function(void *instream, curl_off_t offset, int origin);\fP This function gets
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called by libcurl to seek to a certain position in the input stream and can be
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used to fast forward a file in a resumed upload (instead of reading all
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uploaded bytes with the normal read function/callback). It is also called to
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rewind a stream when doing a HTTP PUT or POST with a multi-pass authentication
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method. The function shall work like "fseek" or "lseek" and accepted SEEK_SET,
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SEEK_CUR and SEEK_END as argument for origin, although libcurl currently only
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passes SEEK_SET. The callback must return 0 (CURL_SEEKFUNC_OK) on success, 1
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(CURL_SEEKFUNC_FAIL) to cause the upload operation to fail or 2
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(CURL_SEEKFUNC_CANTSEEK) to indicate that while the seek failed, libcurl is
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free to work around the problem if possible. The latter can sometimes be done
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by instead reading from the input or similar.
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By default, this parameter is unset.
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If you forward the input arguments directly to "fseek" or "lseek", note that
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the data type for \fIoffset\fP is not the same as defined for curl_off_t on
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many systems! (Option added in 7.18.0)
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.IP CURLOPT_SEEKDATA
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Data pointer to pass to the file seek function. If you use the
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\fICURLOPT_SEEKFUNCTION\fP option, this is the pointer you'll get as input. If
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you don't specify a seek callback, NULL is passed. (Option added in 7.18.0)
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.IP CURLOPT_SOCKOPTFUNCTION
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Pass a pointer to a function that matches the following prototype: \fBint
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function(void *clientp, curl_socket_t curlfd, curlsocktype purpose);\fP. By
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default, this parameter is unset. If set, this
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function gets called by libcurl after the socket() call but before the
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connect() call. The callback's \fIpurpose\fP argument identifies the exact
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purpose for this particular socket:
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\fICURLSOCKTYPE_IPCXN\fP for actively created connections or since 7.28.0
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\fICURLSOCKTYPE_ACCEPT\fP for FTP when the connection was setup with PORT/EPSV
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(in earlier versions these sockets weren't passed to this callback).
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Future versions of libcurl may support more purposes. It passes the newly
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created socket descriptor so additional setsockopt() calls can be done at the
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user's discretion. Return 0 (zero) from the callback on success. Return 1
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from the callback function to signal an unrecoverable error to the library and
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it will close the socket and return \fICURLE_COULDNT_CONNECT\fP. (Option
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added in 7.16.0)
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Added in 7.21.5, the callback function may return
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\fICURL_SOCKOPT_ALREADY_CONNECTED\fP, which tells libcurl that the socket is
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in fact already connected and then libcurl will not attempt to connect it.
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.IP CURLOPT_SOCKOPTDATA
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Pass a pointer that will be untouched by libcurl and passed as the first
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argument in the sockopt callback set with \fICURLOPT_SOCKOPTFUNCTION\fP.
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The default value of this parameter is unspecified.
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(Option added in 7.16.0)
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.IP CURLOPT_OPENSOCKETFUNCTION
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Pass a pointer to a function that matches the following prototype:
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\fBcurl_socket_t function(void *clientp, curlsocktype purpose, struct
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curl_sockaddr *address);\fP. This function gets called by libcurl instead of
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the \fIsocket(2)\fP call. The callback's \fIpurpose\fP argument identifies the
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exact purpose for this particular socket: \fICURLSOCKTYPE_IPCXN\fP is for IP
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based connections. Future versions of libcurl may support more purposes. It
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passes the resolved peer address as a \fIaddress\fP argument so the callback
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can modify the address or refuse to connect at all. The callback function
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should return the socket or \fICURL_SOCKET_BAD\fP in case no connection could
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be established or another error was detected. Any additional
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\fIsetsockopt(2)\fP calls can be done on the socket at the user's discretion.
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\fICURL_SOCKET_BAD\fP return value from the callback function will signal an
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unrecoverable error to the library and it will return
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\fICURLE_COULDNT_CONNECT\fP. This return code can be used for IP address
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blacklisting. The default behavior is:
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.nf
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return socket(addr->family, addr->socktype, addr->protocol);
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.fi
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(Option added in 7.17.1.)
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.IP CURLOPT_OPENSOCKETDATA
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Pass a pointer that will be untouched by libcurl and passed as the first
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argument in the opensocket callback set with \fICURLOPT_OPENSOCKETFUNCTION\fP.
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The default value of this parameter is unspecified.
|
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(Option added in 7.17.1.)
|
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.IP CURLOPT_CLOSESOCKETFUNCTION
|
|
Pass a pointer to a function that matches the following prototype: \fBint
|
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function(void *clientp, curl_socket_t item);\fP. This function gets called by
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|
libcurl instead of the \fIclose(3)\fP or \fIclosesocket(3)\fP call when
|
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sockets are closed (not for any other file descriptors). This is pretty much
|
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the reverse to the \fICURLOPT_OPENSOCKETFUNCTION\fP option. Return 0 to signal
|
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success and 1 if there was an error. (Option added in 7.21.7)
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.IP CURLOPT_CLOSESOCKETDATA
|
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Pass a pointer that will be untouched by libcurl and passed as the first
|
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argument in the closesocket callback set with
|
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\fICURLOPT_CLOSESOCKETFUNCTION\fP.
|
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The default value of this parameter is unspecified.
|
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(Option added in 7.21.7)
|
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.IP CURLOPT_PROGRESSFUNCTION
|
|
Pass a pointer to a function that matches the following prototype:
|
|
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\fBint function(void *clientp, double dltotal, double dlnow, double ultotal,
|
|
double ulnow);\fP
|
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|
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This function gets called by libcurl instead of its internal equivalent with a
|
|
frequent interval. While data is being transferred it will be called very
|
|
frequently, and during slow periods like when nothing is being transferred it
|
|
can slow down to about one call per second.
|
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|
|
\fIclientp\fP is the pointer set with \fICURLOPT_PROGRESSDATA\fP, it is not
|
|
actually used by libcurl but is only passed along from the application to the
|
|
callback.
|
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|
|
The callback gets told how much data libcurl will transfer and has
|
|
transferred, in number of bytes. \fIdltotal\fP is the total number of bytes
|
|
libcurl expects to download in this transfer. \fIdlnow\fP is the number of
|
|
bytes downloaded so far. \fIultotal\fP is the total number of bytes libcurl
|
|
expects to upload in this transfer. \fIulnow\fP is the number of bytes
|
|
uploaded so far.
|
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|
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Unknown/unused argument values passed to the callback will be set to zero
|
|
(like if you only download data, the upload size will remain 0). Many times
|
|
the callback will be called one or more times first, before it knows the data
|
|
sizes so a program must be made to handle that.
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|
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Returning a non-zero value from this callback will cause libcurl to abort the
|
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transfer and return \fICURLE_ABORTED_BY_CALLBACK\fP.
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If you transfer data with the multi interface, this function will not be
|
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called during periods of idleness unless you call the appropriate libcurl
|
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function that performs transfers.
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|
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\fICURLOPT_NOPROGRESS\fP must be set to 0 to make this function actually
|
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get called.
|
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.IP CURLOPT_XFERINFOFUNCTION
|
|
Pass a pointer to a function that matches the following prototype:
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|
|
.nf
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|
\fBint function(void *clientp, curl_off_t dltotal, curl_off_t dlnow,
|
|
curl_off_t ultotal, curl_off_t ulnow);\fP
|
|
.fi
|
|
|
|
This function gets called by libcurl instead of its internal equivalent with a
|
|
frequent interval. While data is being transferred it will be called very
|
|
frequently, and during slow periods like when nothing is being transferred it
|
|
can slow down to about one call per second.
|
|
|
|
\fIclientp\fP is the pointer set with \fICURLOPT_XFERINFODATA\fP, it is only
|
|
passed along from the application to the callback.
|
|
|
|
The callback gets told how much data libcurl will transfer and has
|
|
transferred, in number of bytes. \fIdltotal\fP is the total number of bytes
|
|
libcurl expects to download in this transfer. \fIdlnow\fP is the number of
|
|
bytes downloaded so far. \fIultotal\fP is the total number of bytes libcurl
|
|
expects to upload in this transfer. \fIulnow\fP is the number of bytes
|
|
uploaded so far.
|
|
|
|
Unknown/unused argument values passed to the callback will be set to zero
|
|
(like if you only download data, the upload size will remain 0). Many times
|
|
the callback will be called one or more times first, before it knows the data
|
|
sizes so a program must be made to handle that.
|
|
|
|
Returning a non-zero value from this callback will cause libcurl to abort the
|
|
transfer and return \fICURLE_ABORTED_BY_CALLBACK\fP.
|
|
|
|
If you transfer data with the multi interface, this function will not be
|
|
called during periods of idleness unless you call the appropriate libcurl
|
|
function that performs transfers.
|
|
|
|
\fICURLOPT_NOPROGRESS\fP must be set to 0 to make this function actually
|
|
get called.
|
|
|
|
(Added in 7.32.0)
|
|
.IP CURLOPT_PROGRESSDATA
|
|
Pass a pointer that will be untouched by libcurl and passed as the first
|
|
argument in the progress callback set with \fICURLOPT_PROGRESSFUNCTION\fP.
|
|
The default value of this parameter is unspecified.
|
|
.IP CURLOPT_XFERINFODATA
|
|
Pass a pointer that will be untouched by libcurl and passed as the first
|
|
argument in the progress callback set with \fICURLOPT_XFERINFOFUNCTION\fP.
|
|
The default value of this parameter is unspecified. This option is an alias
|
|
for CURLOPT_PROGRESSDATA. (Added in 7.32.0)
|
|
.IP CURLOPT_HEADERFUNCTION
|
|
Pass a pointer to a function that matches the following prototype:
|
|
\fBsize_t function( void *ptr, size_t size, size_t nmemb, void
|
|
*userdata);\fP. This function gets called by libcurl as soon as it has
|
|
received header data. The header callback will be called once for each header
|
|
and only complete header lines are passed on to the callback. Parsing headers
|
|
is very easy using this. The size of the data pointed to by \fIptr\fP is
|
|
\fIsize\fP multiplied with \fInmemb\fP. Do not assume that the header line is
|
|
zero terminated! The pointer named \fIuserdata\fP is the one you set with the
|
|
\fICURLOPT_WRITEHEADER\fP option. The callback function must return the number
|
|
of bytes actually taken care of. If that amount differs from the amount passed
|
|
to your function, it'll signal an error to the library. This will abort the
|
|
transfer and return \fICURL_WRITE_ERROR\fP.
|
|
|
|
A complete HTTP header that is passed to this function can be up to
|
|
\fICURL_MAX_HTTP_HEADER\fP (100K) bytes.
|
|
|
|
If this option is not set, or if it is set to NULL, but
|
|
\fICURLOPT_HEADERDATA\fP (\fICURLOPT_WRITEHEADER\fP) is set to anything but
|
|
NULL, the function used to accept response data will be used instead. That is,
|
|
it will be the function specified with \fICURLOPT_WRITEFUNCTION\fP, or if it
|
|
is not specified or NULL - the default, stream-writing function.
|
|
|
|
It's important to note that the callback will be invoked for the headers of
|
|
all responses received after initiating a request and not just the final
|
|
response. This includes all responses which occur during authentication
|
|
negotiation. If you need to operate on only the headers from the final
|
|
response, you will need to collect headers in the callback yourself and use
|
|
HTTP status lines, for example, to delimit response boundaries.
|
|
|
|
When a server sends a chunked encoded transfer, it may contain a trailer. That
|
|
trailer is identical to a HTTP header and if such a trailer is received it is
|
|
passed to the application using this callback as well. There are several ways
|
|
to detect it being a trailer and not an ordinary header: 1) it comes after the
|
|
response-body. 2) it comes after the final header line (CR LF) 3) a Trailer:
|
|
header among the regular response-headers mention what header(s) to expect in
|
|
the trailer.
|
|
|
|
For non-HTTP protocols like FTP, POP3, IMAP and SMTP this function will get
|
|
called with the server responses to the commands that libcurl sends.
|
|
.IP CURLOPT_WRITEHEADER
|
|
(This option is also known as \fBCURLOPT_HEADERDATA\fP) Pass a pointer to be
|
|
used to write the header part of the received data to. If you don't use
|
|
\fICURLOPT_WRITEFUNCTION\fP or \fICURLOPT_HEADERFUNCTION\fP to take care of
|
|
the writing, this must be a valid FILE * as the internal default will then be
|
|
a plain fwrite(). See also the \fICURLOPT_HEADERFUNCTION\fP option above on
|
|
how to set a custom get-all-headers callback.
|
|
.IP CURLOPT_DEBUGFUNCTION
|
|
Pass a pointer to a function that matches the following prototype: \fBint
|
|
curl_debug_callback (CURL *, curl_infotype, char *, size_t, void *);\fP
|
|
\fICURLOPT_DEBUGFUNCTION\fP replaces the standard debug function used when
|
|
\fICURLOPT_VERBOSE \fP is in effect. This callback receives debug information,
|
|
as specified with the \fBcurl_infotype\fP argument. This function must return
|
|
0. The data pointed to by the char * passed to this function WILL NOT be zero
|
|
terminated, but will be exactly of the size as told by the size_t argument.
|
|
|
|
Available curl_infotype values:
|
|
.RS
|
|
.IP CURLINFO_TEXT
|
|
The data is informational text.
|
|
.IP CURLINFO_HEADER_IN
|
|
The data is header (or header-like) data received from the peer.
|
|
.IP CURLINFO_HEADER_OUT
|
|
The data is header (or header-like) data sent to the peer.
|
|
.IP CURLINFO_DATA_IN
|
|
The data is protocol data received from the peer.
|
|
.IP CURLINFO_DATA_OUT
|
|
The data is protocol data sent to the peer.
|
|
.RE
|
|
.IP CURLOPT_DEBUGDATA
|
|
Pass a pointer to whatever you want passed in to your
|
|
\fICURLOPT_DEBUGFUNCTION\fP in the last void * argument. This pointer is not
|
|
used by libcurl, it is only passed to the callback.
|
|
.IP CURLOPT_SSL_CTX_FUNCTION
|
|
This option does only function for libcurl powered by OpenSSL. If libcurl was
|
|
built against another SSL library, this functionality is absent.
|
|
|
|
Pass a pointer to a function that matches the following prototype:
|
|
\fBCURLcode sslctxfun(CURL *curl, void *sslctx, void *parm);\fP This function
|
|
gets called by libcurl just before the initialization of a SSL connection
|
|
after having processed all other SSL related options to give a last chance to
|
|
an application to modify the behaviour of openssl's ssl initialization. The
|
|
\fIsslctx\fP parameter is actually a pointer to an openssl \fISSL_CTX\fP. If
|
|
an error is returned no attempt to establish a connection is made and the
|
|
perform operation will return the error code from this callback function. Set
|
|
the \fIparm\fP argument with the \fICURLOPT_SSL_CTX_DATA\fP option. This
|
|
option was introduced in 7.11.0.
|
|
|
|
This function will get called on all new connections made to a server, during
|
|
the SSL negotiation. The SSL_CTX pointer will be a new one every time.
|
|
|
|
To use this properly, a non-trivial amount of knowledge of the openssl
|
|
libraries is necessary. For example, using this function allows you to use
|
|
openssl callbacks to add additional validation code for certificates, and even
|
|
to change the actual URI of a HTTPS request (example used in the lib509 test
|
|
case). See also the example section for a replacement of the key, certificate
|
|
and trust file settings.
|
|
.IP CURLOPT_SSL_CTX_DATA
|
|
Data pointer to pass to the ssl context callback set by the option
|
|
\fICURLOPT_SSL_CTX_FUNCTION\fP, this is the pointer you'll get as third
|
|
parameter, otherwise \fBNULL\fP. (Added in 7.11.0)
|
|
.IP CURLOPT_CONV_TO_NETWORK_FUNCTION
|
|
.IP CURLOPT_CONV_FROM_NETWORK_FUNCTION
|
|
.IP CURLOPT_CONV_FROM_UTF8_FUNCTION
|
|
Pass a pointer to a function that matches the following prototype:
|
|
\fBCURLcode function(char *ptr, size_t length);\fP
|
|
|
|
These three options apply to non-ASCII platforms only. They are available
|
|
only if \fBCURL_DOES_CONVERSIONS\fP was defined when libcurl was built. When
|
|
this is the case, \fIcurl_version_info(3)\fP will return the CURL_VERSION_CONV
|
|
feature bit set.
|
|
|
|
The data to be converted is in a buffer pointed to by the ptr parameter. The
|
|
amount of data to convert is indicated by the length parameter. The converted
|
|
data overlays the input data in the buffer pointed to by the ptr parameter.
|
|
CURLE_OK should be returned upon successful conversion. A CURLcode return
|
|
value defined by curl.h, such as CURLE_CONV_FAILED, should be returned if an
|
|
error was encountered.
|
|
|
|
\fBCURLOPT_CONV_TO_NETWORK_FUNCTION\fP and
|
|
\fBCURLOPT_CONV_FROM_NETWORK_FUNCTION\fP convert between the host encoding and
|
|
the network encoding. They are used when commands or ASCII data are
|
|
sent/received over the network.
|
|
|
|
\fBCURLOPT_CONV_FROM_UTF8_FUNCTION\fP is called to convert from UTF8 into the
|
|
host encoding. It is required only for SSL processing.
|
|
|
|
If you set a callback pointer to NULL, or don't set it at all, the built-in
|
|
libcurl iconv functions will be used. If HAVE_ICONV was not defined when
|
|
libcurl was built, and no callback has been established, conversion will
|
|
return the CURLE_CONV_REQD error code.
|
|
|
|
If HAVE_ICONV is defined, CURL_ICONV_CODESET_OF_HOST must also be defined.
|
|
For example:
|
|
|
|
\&#define CURL_ICONV_CODESET_OF_HOST "IBM-1047"
|
|
|
|
The iconv code in libcurl will default the network and UTF8 codeset names as
|
|
follows:
|
|
|
|
\&#define CURL_ICONV_CODESET_OF_NETWORK "ISO8859-1"
|
|
|
|
\&#define CURL_ICONV_CODESET_FOR_UTF8 "UTF-8"
|
|
|
|
You will need to override these definitions if they are different on your
|
|
system.
|
|
.IP CURLOPT_INTERLEAVEFUNCTION
|
|
Pass a pointer to a function that matches the following prototype:
|
|
\fBsize_t function( void *ptr, size_t size, size_t nmemb, void
|
|
*userdata)\fP. This function gets called by libcurl as soon as it has received
|
|
interleaved RTP data. This function gets called for each $ block and therefore
|
|
contains exactly one upper-layer protocol unit (e.g. one RTP packet). Curl
|
|
writes the interleaved header as well as the included data for each call. The
|
|
first byte is always an ASCII dollar sign. The dollar sign is followed by a
|
|
one byte channel identifier and then a 2 byte integer length in network byte
|
|
order. See \fIRFC2326 Section 10.12\fP for more information on how RTP
|
|
interleaving behaves. If unset or set to NULL, curl will use the default write
|
|
function.
|
|
|
|
Interleaved RTP poses some challenges for the client application. Since the
|
|
stream data is sharing the RTSP control connection, it is critical to service
|
|
the RTP in a timely fashion. If the RTP data is not handled quickly,
|
|
subsequent response processing may become unreasonably delayed and the
|
|
connection may close. The application may use \fICURL_RTSPREQ_RECEIVE\fP to
|
|
service RTP data when no requests are desired. If the application makes a
|
|
request, (e.g. \fICURL_RTSPREQ_PAUSE\fP) then the response handler will
|
|
process any pending RTP data before marking the request as finished. (Added
|
|
in 7.20.0)
|
|
.IP CURLOPT_INTERLEAVEDATA
|
|
This is the userdata pointer that will be passed to
|
|
\fICURLOPT_INTERLEAVEFUNCTION\fP when interleaved RTP data is received. (Added
|
|
in 7.20.0)
|
|
.IP CURLOPT_CHUNK_BGN_FUNCTION
|
|
Pass a pointer to a function that matches the following prototype:
|
|
\fBlong function (const void *transfer_info, void *ptr, int remains)\fP. This
|
|
function gets called by libcurl before a part of the stream is going to be
|
|
transferred (if the transfer supports chunks).
|
|
|
|
This callback makes sense only when using the \fICURLOPT_WILDCARDMATCH\fP
|
|
option for now.
|
|
|
|
The target of transfer_info parameter is a "feature depended" structure. For
|
|
the FTP wildcard download, the target is curl_fileinfo structure (see
|
|
\fIcurl/curl.h\fP). The parameter ptr is a pointer given by
|
|
\fICURLOPT_CHUNK_DATA\fP. The parameter remains contains number of chunks
|
|
remaining per the transfer. If the feature is not available, the parameter has
|
|
zero value.
|
|
|
|
Return \fICURL_CHUNK_BGN_FUNC_OK\fP if everything is fine,
|
|
\fICURL_CHUNK_BGN_FUNC_SKIP\fP if you want to skip the concrete chunk or
|
|
\fICURL_CHUNK_BGN_FUNC_FAIL\fP to tell libcurl to stop if some error occurred.
|
|
(This was added in 7.21.0)
|
|
.IP CURLOPT_CHUNK_END_FUNCTION
|
|
Pass a pointer to a function that matches the following prototype:
|
|
\fBlong function(void *ptr)\fP. This function gets called by libcurl as soon
|
|
as a part of the stream has been transferred (or skipped).
|
|
|
|
Return \fICURL_CHUNK_END_FUNC_OK\fP if everything is fine or
|
|
\fBCURL_CHUNK_END_FUNC_FAIL\fP to tell the lib to stop if some error occurred.
|
|
(This was added in 7.21.0)
|
|
.IP CURLOPT_CHUNK_DATA
|
|
Pass a pointer that will be untouched by libcurl and passed as the ptr
|
|
argument to the \fICURL_CHUNK_BGN_FUNTION\fP and \fICURL_CHUNK_END_FUNTION\fP.
|
|
(This was added in 7.21.0)
|
|
.IP CURLOPT_FNMATCH_FUNCTION
|
|
Pass a pointer to a function that matches the following prototype: \fBint
|
|
function(void *ptr, const char *pattern, const char *string)\fP prototype (see
|
|
\fIcurl/curl.h\fP). It is used internally for the wildcard matching feature.
|
|
|
|
Return \fICURL_FNMATCHFUNC_MATCH\fP if pattern matches the string,
|
|
\fICURL_FNMATCHFUNC_NOMATCH\fP if not or \fICURL_FNMATCHFUNC_FAIL\fP if an
|
|
error occurred. (This was added in 7.21.0)
|
|
.IP CURLOPT_FNMATCH_DATA
|
|
Pass a pointer that will be untouched by libcurl and passed as the ptr argument
|
|
to the \fICURL_FNMATCH_FUNCTION\fP. (This was added in 7.21.0)
|
|
.SH ERROR OPTIONS
|
|
.IP CURLOPT_ERRORBUFFER
|
|
Pass a char * to a buffer that the libcurl may store human readable error
|
|
messages in. This may be more helpful than just the return code from
|
|
\fIcurl_easy_perform\fP. The buffer must be at least CURL_ERROR_SIZE big.
|
|
Although this argument is a 'char *', it does not describe an input string.
|
|
Therefore the (probably undefined) contents of the buffer is NOT copied by the
|
|
library. You must keep the associated storage available until libcurl no
|
|
longer needs it. Failing to do so will cause very odd behavior or even
|
|
crashes. libcurl will need it until you call \fIcurl_easy_cleanup(3)\fP or you
|
|
set the same option again to use a different pointer.
|
|
|
|
Use \fICURLOPT_VERBOSE\fP and \fICURLOPT_DEBUGFUNCTION\fP to better
|
|
debug/trace why errors happen.
|
|
|
|
If the library does not return an error, the buffer may not have been
|
|
touched. Do not rely on the contents in those cases.
|
|
|
|
.IP CURLOPT_STDERR
|
|
Pass a FILE * as parameter. Tell libcurl to use this stream instead of stderr
|
|
when showing the progress meter and displaying \fICURLOPT_VERBOSE\fP data.
|
|
.IP CURLOPT_FAILONERROR
|
|
A parameter set to 1 tells the library to fail silently if the HTTP code
|
|
returned is equal to or larger than 400. The default action would be to return
|
|
the page normally, ignoring that code.
|
|
|
|
This method is not fail-safe and there are occasions where non-successful
|
|
response codes will slip through, especially when authentication is involved
|
|
(response codes 401 and 407).
|
|
|
|
You might get some amounts of headers transferred before this situation is
|
|
detected, like when a "100-continue" is received as a response to a
|
|
POST/PUT and a 401 or 407 is received immediately afterwards.
|
|
.SH NETWORK OPTIONS
|
|
.IP CURLOPT_URL
|
|
Pass in a pointer to the actual URL to deal with. The parameter should be a
|
|
char * to a zero terminated string which must be URL-encoded in the following
|
|
format:
|
|
|
|
scheme://host:port/path
|
|
|
|
For a greater explanation of the format please see RFC3986.
|
|
|
|
If the given URL lacks the scheme (such as "http://" or "ftp://" etc) then
|
|
libcurl will attempt to resolve the protocol based on one of the following
|
|
given host names:
|
|
|
|
HTTP, FTP, DICT, LDAP, IMAP, POP3 or SMTP
|
|
|
|
(POP3 and SMTP added in 7.31.0)
|
|
|
|
Should the protocol, either that specified by the scheme or deduced by libcurl
|
|
from the host name, not be supported by libcurl then
|
|
(\fICURLE_UNSUPPORTED_PROTOCOL\fP) will be returned from either the
|
|
\fIcurl_easy_perform(3)\fP or \fIcurl_multi_perform(3)\fP functions when you
|
|
call them. Use \fIcurl_version_info(3)\fP for detailed information of which
|
|
protocols are supported by the build of libcurl you are using.
|
|
|
|
The host part of the URL contains the address of the server that you want to
|
|
connect to. This can be the fully qualified domain name of the server, the
|
|
local network name of the machine on your network or the IP address of the
|
|
server or machine represented by either an IPv4 or IPv6 address. For example:
|
|
|
|
http://www.example.com/
|
|
|
|
http://hostname/
|
|
|
|
http://192.168.0.1/
|
|
|
|
http://[2001:1890:1112:1::20]/
|
|
|
|
It is also possible to specify the user name, password and any supported login
|
|
options as part of the host, for the following protocols, when connecting to
|
|
servers that require authentication:
|
|
|
|
http://user:password@www.example.com
|
|
|
|
ftp://user:password@ftp.example.com
|
|
|
|
imap://user:password;options@mail.example.com
|
|
|
|
pop3://user:password;options@mail.example.com
|
|
|
|
smtp://user:password;options@mail.example.com
|
|
|
|
At present only IMAP, POP3 and SMTP support login options as part of the host.
|
|
For more information about the login options in URL syntax please see RFC2384,
|
|
RFC5092 and IETF draft draft-earhart-url-smtp-00.txt (Added in 7.31.0).
|
|
|
|
The port is optional and when not specified libcurl will use the default port
|
|
based on the determined or specified protocol: 80 for HTTP, 21 for FTP and 25
|
|
for SMTP, etc. The following examples show how to specify the port:
|
|
|
|
http://www.example.com:8080/ - This will connect to a web server using port
|
|
8080 rather than 80.
|
|
|
|
smtp://mail.example.com:587/ - This will connect to a SMTP server on the
|
|
alternative mail port.
|
|
|
|
The path part of the URL is protocol specific and whilst some examples are
|
|
given below this list is not conclusive:
|
|
|
|
.B HTTP
|
|
|
|
The path part of a HTTP request specifies the file to retrieve and from what
|
|
directory. If the directory is not specified then the web server's root
|
|
directory is used. If the file is omitted then the default document will be
|
|
retrieved for either the directory specified or the root directory. The
|
|
exact resource returned for each URL is entirely dependent on the server's
|
|
configuration.
|
|
|
|
http://www.example.com - This gets the main page from the web server.
|
|
|
|
http://www.example.com/index.html - This returns the main page by explicitly
|
|
requesting it.
|
|
|
|
http://www.example.com/contactus/ - This returns the default document from
|
|
the contactus directory.
|
|
|
|
.B FTP
|
|
|
|
The path part of an FTP request specifies the file to retrieve and from what
|
|
directory. If the file part is omitted then libcurl downloads the directory
|
|
listing for the directory specified. If the directory is omitted then
|
|
the directory listing for the root / home directory will be returned.
|
|
|
|
ftp://ftp.example.com - This retrieves the directory listing for the root
|
|
directory.
|
|
|
|
ftp://ftp.example.com/readme.txt - This downloads the file readme.txt from the
|
|
root directory.
|
|
|
|
ftp://ftp.example.com/libcurl/readme.txt - This downloads readme.txt from the
|
|
libcurl directory.
|
|
|
|
ftp://user:password@ftp.example.com/readme.txt - This retrieves the readme.txt
|
|
file from the user's home directory. When a username and password is
|
|
specified, everything that is specified in the path part is relative to the
|
|
user's home directory. To retrieve files from the root directory or a
|
|
directory underneath the root directory then the absolute path must be
|
|
specified by prepending an additional forward slash to the beginning of the
|
|
path.
|
|
|
|
ftp://user:password@ftp.example.com//readme.txt - This retrieves the readme.txt
|
|
from the root directory when logging in as a specified user.
|
|
|
|
.B SMTP
|
|
|
|
The path part of a SMTP request specifies the host name to present during
|
|
communication with the mail server. If the path is omitted then libcurl will
|
|
attempt to resolve the local computer's host name. However, this may not
|
|
return the fully qualified domain name that is required by some mail servers
|
|
and specifying this path allows you to set an alternative name, such as
|
|
your machine's fully qualified domain name, which you might have obtained
|
|
from an external function such as gethostname or getaddrinfo.
|
|
|
|
smtp://mail.example.com - This connects to the mail server at example.com and
|
|
sends your local computer's host name in the HELO / EHLO command.
|
|
|
|
smtp://mail.example.com/client.example.com - This will send client.example.com in
|
|
the HELO / EHLO command to the mail server at example.com.
|
|
|
|
.B POP3
|
|
|
|
The path part of a POP3 request specifies the message ID to retrieve. If the
|
|
ID is not specified then a list of waiting messages is returned instead.
|
|
|
|
pop3://user:password@mail.example.com - This lists the available messages for
|
|
the user
|
|
|
|
pop3://user:password@mail.example.com/1 - This retrieves the first message for
|
|
the user
|
|
|
|
.B IMAP
|
|
|
|
The path part of an IMAP request not only specifies the mailbox to list (Added
|
|
in 7.30.0) or select, but can also be used to check the UIDVALIDITY of the
|
|
mailbox and to specify the UID and SECTION of the message to fetch (Added in
|
|
7.30.0).
|
|
|
|
imap://user:password@mail.example.com - Performs a top level folder list
|
|
|
|
imap://user:password@mail.example.com/INBOX - Performs a folder list on the
|
|
user's inbox
|
|
|
|
imap://user:password@mail.example.com/INBOX/;UID=1 - Selects the user's inbox
|
|
and fetches message 1
|
|
|
|
imap://user:password@mail.example.com/INBOX;UIDVALIDITY=50/;UID=2 - Selects
|
|
the user's inbox, checks the UIDVALIDITY of the mailbox is 50 and fetches
|
|
message 2 if it is
|
|
|
|
imap://user:password@mail.example.com/INBOX/;UID=3/;SECTION=TEXT - Selects the
|
|
user's inbox and fetches message 3 with only the text portion of the message
|
|
|
|
For more information about the individual components of an IMAP URL please
|
|
see RFC5092.
|
|
|
|
.B SCP
|
|
|
|
The path part of a SCP request specifies the file to retrieve and from what
|
|
directory. The file part may not be omitted. The file is taken as an absolute
|
|
path from the root directory on the server. To specify a path relative to
|
|
the user's home directory on the server, prepend ~/ to the path portion.
|
|
If the user name is not embedded in the URL, it can be set with the
|
|
\fICURLOPT_USERPWD\fP or \fBCURLOPT_USERNAME\fP option.
|
|
|
|
scp://user@example.com/etc/issue - This specifies the file /etc/issue
|
|
|
|
scp://example.com/~/my-file - This specifies the file my-file in the
|
|
user's home directory on the server
|
|
|
|
.B SFTP
|
|
|
|
The path part of a SFTP request specifies the file to retrieve and from what
|
|
directory. If the file part is omitted then libcurl downloads the directory
|
|
listing for the directory specified. If the path ends in a / then a directory
|
|
listing is returned instead of a file. If the path is omitted entirely then
|
|
the directory listing for the root / home directory will be returned.
|
|
If the user name is not embedded in the URL, it can be set with the
|
|
\fICURLOPT_USERPWD\fP or \fBCURLOPT_USERNAME\fP option.
|
|
|
|
sftp://user:password@example.com/etc/issue - This specifies the file
|
|
/etc/issue
|
|
|
|
sftp://user@example.com/~/my-file - This specifies the file my-file in the
|
|
user's home directory
|
|
|
|
sftp://ssh.example.com/~/Documents/ - This requests a directory listing
|
|
of the Documents directory under the user's home directory
|
|
|
|
.B LDAP
|
|
|
|
The path part of a LDAP request can be used to specify the: Distinguished
|
|
Name, Attributes, Scope, Filter and Extension for a LDAP search. Each field
|
|
is separated by a question mark and when that field is not required an empty
|
|
string with the question mark separator should be included.
|
|
|
|
ldap://ldap.example.com/o=My%20Organisation - This will perform a LDAP search
|
|
with the DN as My Organisation.
|
|
|
|
ldap://ldap.example.com/o=My%20Organisation?postalAddress - This will perform
|
|
the same search but will only return postalAddress attributes.
|
|
|
|
ldap://ldap.example.com/?rootDomainNamingContext - This specifies an empty DN
|
|
and requests information about the rootDomainNamingContext attribute for an
|
|
Active Directory server.
|
|
|
|
For more information about the individual components of a LDAP URL please
|
|
see RFC4516.
|
|
|
|
.B RTMP
|
|
|
|
There's no official URL spec for RTMP so libcurl uses the URL syntax supported
|
|
by the underlying librtmp library. It has a syntax where it wants a
|
|
traditional URL, followed by a space and a series of space-separated
|
|
name=value pairs.
|
|
|
|
While space is not typically a "legal" letter, libcurl accepts them. When a
|
|
user wants to pass in a '#' (hash) character it will be treated as a fragment
|
|
and get cut off by libcurl if provided literally. You will instead have to
|
|
escape it by providing it as backslash and its ASCII value in hexadecimal:
|
|
"\\23".
|
|
|
|
.B NOTES
|
|
|
|
Starting with version 7.20.0, the fragment part of the URI will not be sent as
|
|
part of the path, which was previously the case.
|
|
|
|
\fICURLOPT_URL\fP is the only option that \fBmust\fP be set before
|
|
\fIcurl_easy_perform(3)\fP is called.
|
|
|
|
\fICURLOPT_PROTOCOLS\fP can be used to limit what protocols libcurl will use
|
|
for this transfer, independent of what libcurl has been compiled to
|
|
support. That may be useful if you accept the URL from an external source and
|
|
want to limit the accessibility.
|
|
.IP CURLOPT_PROTOCOLS
|
|
Pass a long that holds a bitmask of CURLPROTO_* defines. If used, this bitmask
|
|
limits what protocols libcurl may use in the transfer. This allows you to have
|
|
a libcurl built to support a wide range of protocols but still limit specific
|
|
transfers to only be allowed to use a subset of them. By default libcurl will
|
|
accept all protocols it supports. See also
|
|
\fICURLOPT_REDIR_PROTOCOLS\fP. (Added in 7.19.4)
|
|
.IP CURLOPT_REDIR_PROTOCOLS
|
|
Pass a long that holds a bitmask of CURLPROTO_* defines. If used, this bitmask
|
|
limits what protocols libcurl may use in a transfer that it follows to in a
|
|
redirect when \fICURLOPT_FOLLOWLOCATION\fP is enabled. This allows you to
|
|
limit specific transfers to only be allowed to use a subset of protocols in
|
|
redirections. By default libcurl will allow all protocols except for FILE and
|
|
SCP. This is a difference compared to pre-7.19.4 versions which
|
|
unconditionally would follow to all protocols supported. (Added in 7.19.4)
|
|
.IP CURLOPT_PROXY
|
|
Set HTTP proxy to use. The parameter should be a char * to a zero terminated
|
|
string holding the host name or dotted IP address. To specify port number in
|
|
this string, append :[port] to the end of the host name. The proxy string may
|
|
be prefixed with [protocol]:// since any such prefix will be ignored. The
|
|
proxy's port number may optionally be specified with the separate option. If
|
|
not specified, libcurl will default to using port 1080 for proxies.
|
|
\fICURLOPT_PROXYPORT\fP.
|
|
|
|
When you tell the library to use a HTTP proxy, libcurl will transparently
|
|
convert operations to HTTP even if you specify an FTP URL etc. This may have
|
|
an impact on what other features of the library you can use, such as
|
|
\fICURLOPT_QUOTE\fP and similar FTP specifics that don't work unless you
|
|
tunnel through the HTTP proxy. Such tunneling is activated with
|
|
\fICURLOPT_HTTPPROXYTUNNEL\fP.
|
|
|
|
libcurl respects the environment variables \fBhttp_proxy\fP, \fBftp_proxy\fP,
|
|
\fBall_proxy\fP etc, if any of those are set. The \fICURLOPT_PROXY\fP option
|
|
does however override any possibly set environment variables.
|
|
|
|
Setting the proxy string to "" (an empty string) will explicitly disable the
|
|
use of a proxy, even if there is an environment variable set for it.
|
|
|
|
Since 7.14.1, the proxy host string given in environment variables can be
|
|
specified the exact same way as the proxy can be set with \fICURLOPT_PROXY\fP,
|
|
include protocol prefix (http://) and embedded user + password.
|
|
|
|
Since 7.21.7, the proxy string may be specified with a protocol:// prefix to
|
|
specify alternative proxy protocols. Use socks4://, socks4a://, socks5:// or
|
|
socks5h:// (the last one to enable socks5 and asking the proxy to do the
|
|
resolving, also known as CURLPROXY_SOCKS5_HOSTNAME type) to request the
|
|
specific SOCKS version to be used. No protocol specified, http:// and all
|
|
others will be treated as HTTP proxies.
|
|
.IP CURLOPT_PROXYPORT
|
|
Pass a long with this option to set the proxy port to connect to unless it is
|
|
specified in the proxy string \fICURLOPT_PROXY\fP.
|
|
.IP CURLOPT_PROXYTYPE
|
|
Pass a long with this option to set type of the proxy. Available options for
|
|
this are \fICURLPROXY_HTTP\fP, \fICURLPROXY_HTTP_1_0\fP (added in 7.19.4),
|
|
\fICURLPROXY_SOCKS4\fP (added in 7.10), \fICURLPROXY_SOCKS5\fP,
|
|
\fICURLPROXY_SOCKS4A\fP (added in 7.18.0) and \fICURLPROXY_SOCKS5_HOSTNAME\fP
|
|
(added in 7.18.0). The HTTP type is default. (Added in 7.10)
|
|
|
|
If you set \fBCURLOPT_PROXYTYPE\fP to \fICURLPROXY_HTTP_1_0\fP, it will only
|
|
affect how libcurl speaks to a proxy when CONNECT is used. The HTTP version
|
|
used for "regular" HTTP requests is instead controlled with
|
|
\fICURLOPT_HTTP_VERSION\fP.
|
|
.IP CURLOPT_NOPROXY
|
|
Pass a pointer to a zero terminated string. The string consists of a comma
|
|
separated list of host names that do not require a proxy to get reached, even
|
|
if one is specified. The only wildcard available is a single * character,
|
|
which matches all hosts, and effectively disables the proxy. Each name in this
|
|
list is matched as either a domain which contains the hostname, or the
|
|
hostname itself. For example, example.com would match example.com,
|
|
example.com:80, and www.example.com, but not www.notanexample.com. (Added in
|
|
7.19.4)
|
|
.IP CURLOPT_HTTPPROXYTUNNEL
|
|
Set the parameter to 1 to make the library tunnel all operations through a
|
|
given HTTP proxy. There is a big difference between using a proxy and to
|
|
tunnel through it. If you don't know what this means, you probably don't want
|
|
this tunneling option.
|
|
.IP CURLOPT_SOCKS5_GSSAPI_SERVICE
|
|
Pass a char * as parameter to a string holding the name of the service. The
|
|
default service name for a SOCKS5 server is rcmd/server-fqdn. This option
|
|
allows you to change it. (Added in 7.19.4)
|
|
.IP CURLOPT_SOCKS5_GSSAPI_NEC
|
|
Pass a long set to 1 to enable or 0 to disable. As part of the gssapi
|
|
negotiation a protection mode is negotiated. The RFC1961 says in section
|
|
4.3/4.4 it should be protected, but the NEC reference implementation does not.
|
|
If enabled, this option allows the unprotected exchange of the protection mode
|
|
negotiation. (Added in 7.19.4).
|
|
.IP CURLOPT_INTERFACE
|
|
Pass a char * as parameter. This sets the interface name to use as outgoing
|
|
network interface. The name can be an interface name, an IP address, or a host
|
|
name.
|
|
|
|
Starting with 7.24.0: If the parameter starts with "if!" then it is treated as
|
|
only as interface name and no attempt will ever be named to do treat it as an
|
|
IP address or to do name resolution on it. If the parameter starts with
|
|
\&"host!" it is treated as either an IP address or a hostname. Hostnames are
|
|
resolved synchronously. Using the if! format is highly recommended when using
|
|
the multi interfaces to avoid allowing the code to block. If "if!" is
|
|
specified but the parameter does not match an existing interface,
|
|
CURLE_INTERFACE_FAILED is returned.
|
|
.IP CURLOPT_LOCALPORT
|
|
Pass a long. This sets the local port number of the socket used for
|
|
connection. This can be used in combination with \fICURLOPT_INTERFACE\fP and
|
|
you are recommended to use \fICURLOPT_LOCALPORTRANGE\fP as well when this is
|
|
set. Valid port numbers are 1 - 65535. (Added in 7.15.2)
|
|
.IP CURLOPT_LOCALPORTRANGE
|
|
Pass a long. This is the number of attempts libcurl will make to find a
|
|
working local port number. It starts with the given \fICURLOPT_LOCALPORT\fP
|
|
and adds one to the number for each retry. Setting this to 1 or below will
|
|
make libcurl do only one try for the exact port number. Port numbers by nature
|
|
are scarce resources that will be busy at times so setting this value to
|
|
something too low might cause unnecessary connection setup failures. (Added in
|
|
7.15.2)
|
|
.IP CURLOPT_DNS_CACHE_TIMEOUT
|
|
Pass a long, this sets the timeout in seconds. Name resolves will be kept in
|
|
memory for this number of seconds. Set to zero to completely disable
|
|
caching, or set to -1 to make the cached entries remain forever. By default,
|
|
libcurl caches this info for 60 seconds.
|
|
|
|
The name resolve functions of various libc implementations don't re-read name
|
|
server information unless explicitly told so (for example, by calling
|
|
\fIres_init(3)\fP). This may cause libcurl to keep using the older server even
|
|
if DHCP has updated the server info, and this may look like a DNS cache issue
|
|
to the casual libcurl-app user.
|
|
.IP CURLOPT_DNS_USE_GLOBAL_CACHE
|
|
Pass a long. If the value is 1, it tells curl to use a global DNS cache
|
|
that will survive between easy handle creations and deletions. This is not
|
|
thread-safe and this will use a global variable.
|
|
|
|
\fBWARNING:\fP this option is considered obsolete. Stop using it. Switch over
|
|
to using the share interface instead! See \fICURLOPT_SHARE\fP and
|
|
\fIcurl_share_init(3)\fP.
|
|
.IP CURLOPT_BUFFERSIZE
|
|
Pass a long specifying your preferred size (in bytes) for the receive buffer
|
|
in libcurl. The main point of this would be that the write callback gets
|
|
called more often and with smaller chunks. This is just treated as a request,
|
|
not an order. You cannot be guaranteed to actually get the given size. (Added
|
|
in 7.10)
|
|
|
|
This size is by default set as big as possible (CURL_MAX_WRITE_SIZE), so it
|
|
only makes sense to use this option if you want it smaller.
|
|
.IP CURLOPT_PORT
|
|
Pass a long specifying what remote port number to connect to, instead of the
|
|
one specified in the URL or the default port for the used protocol.
|
|
.IP CURLOPT_TCP_NODELAY
|
|
Pass a long specifying whether the TCP_NODELAY option is to be set or cleared
|
|
(1 = set, 0 = clear). The option is cleared by default. This will have no
|
|
effect after the connection has been established.
|
|
|
|
Setting this option will disable TCP's Nagle algorithm. The purpose of this
|
|
algorithm is to try to minimize the number of small packets on the network
|
|
(where "small packets" means TCP segments less than the Maximum Segment Size
|
|
(MSS) for the network).
|
|
|
|
Maximizing the amount of data sent per TCP segment is good because it
|
|
amortizes the overhead of the send. However, in some cases (most notably
|
|
telnet or rlogin) small segments may need to be sent without delay. This is
|
|
less efficient than sending larger amounts of data at a time, and can
|
|
contribute to congestion on the network if overdone.
|
|
.IP CURLOPT_ADDRESS_SCOPE
|
|
Pass a long specifying the scope_id value to use when connecting to IPv6
|
|
link-local or site-local addresses. (Added in 7.19.0)
|
|
.IP CURLOPT_TCP_KEEPALIVE
|
|
Pass a long. If set to 1, TCP keepalive probes will be sent. The delay and
|
|
frequency of these probes can be controlled by the \fICURLOPT_TCP_KEEPIDLE\fP
|
|
and \fICURLOPT_TCP_KEEPINTVL\fP options, provided the operating system supports
|
|
them. Set to 0 (default behavior) to disable keepalive probes (Added in
|
|
7.25.0).
|
|
.IP CURLOPT_TCP_KEEPIDLE
|
|
Pass a long. Sets the delay, in seconds, that the operating system will wait
|
|
while the connection is idle before sending keepalive probes. Not all operating
|
|
systems support this option. (Added in 7.25.0)
|
|
.IP CURLOPT_TCP_KEEPINTVL
|
|
Pass a long. Sets the interval, in seconds, that the operating system will wait
|
|
between sending keepalive probes. Not all operating systems support this
|
|
option. (Added in 7.25.0)
|
|
.SH NAMES and PASSWORDS OPTIONS (Authentication)
|
|
.IP CURLOPT_NETRC
|
|
This parameter controls the preference of libcurl between using user names and
|
|
passwords from your \fI~/.netrc\fP file, relative to user names and passwords
|
|
in the URL supplied with \fICURLOPT_URL\fP.
|
|
|
|
libcurl uses a user name (and supplied or prompted password) supplied with
|
|
\fICURLOPT_USERPWD\fP in preference to any of the options controlled by this
|
|
parameter.
|
|
|
|
Pass a long, set to one of the values described below.
|
|
.RS
|
|
.IP CURL_NETRC_OPTIONAL
|
|
The use of your \fI~/.netrc\fP file is optional, and information in the URL is
|
|
to be preferred. The file will be scanned for the host and user name (to
|
|
find the password only) or for the host only, to find the first user name and
|
|
password after that \fImachine\fP, which ever information is not specified in
|
|
the URL.
|
|
|
|
Undefined values of the option will have this effect.
|
|
.IP CURL_NETRC_IGNORED
|
|
The library will ignore the file and use only the information in the URL.
|
|
|
|
This is the default.
|
|
.IP CURL_NETRC_REQUIRED
|
|
This value tells the library that use of the file is required, to ignore the
|
|
information in the URL, and to search the file for the host only.
|
|
.RE
|
|
Only machine name, user name and password are taken into account
|
|
(init macros and similar things aren't supported).
|
|
|
|
libcurl does not verify that the file has the correct properties set (as the
|
|
standard Unix ftp client does). It should only be readable by user.
|
|
.IP CURLOPT_NETRC_FILE
|
|
Pass a char * as parameter, pointing to a zero terminated string containing
|
|
the full path name to the file you want libcurl to use as .netrc file. If this
|
|
option is omitted, and \fICURLOPT_NETRC\fP is set, libcurl will attempt to
|
|
find a .netrc file in the current user's home directory. (Added in 7.10.9)
|
|
.IP CURLOPT_USERPWD
|
|
Pass a char * as parameter, pointing to a zero terminated login details string
|
|
for the connection. The format of which is: [user name]:[password];[options].
|
|
|
|
When using NTLM, you can set the domain by prepending it to the user name and
|
|
separating the domain and name with a forward (/) or backward slash (\\). Like
|
|
this: "domain/user:password" or "domain\\user:password". Some HTTP servers (on
|
|
Windows) support this style even for Basic authentication.
|
|
|
|
When using HTTP and \fICURLOPT_FOLLOWLOCATION\fP, libcurl might perform
|
|
several requests to possibly different hosts. libcurl will only send this user
|
|
and password information to hosts using the initial host name (unless
|
|
\fICURLOPT_UNRESTRICTED_AUTH\fP is set), so if libcurl follows locations to
|
|
other hosts it will not send the user and password to those. This is enforced
|
|
to prevent accidental information leakage.
|
|
|
|
At present only IMAP, POP3 and SMTP support login options as part of the
|
|
details string. For more information about the login options please see
|
|
RFC2384, RFC5092 and IETF draft draft-earhart-url-smtp-00.txt (Added in 7.31.0).
|
|
|
|
Use \fICURLOPT_HTTPAUTH\fP to specify the authentication method for HTTP based
|
|
connections.
|
|
.IP CURLOPT_PROXYUSERPWD
|
|
Pass a char * as parameter, which should be [user name]:[password] to use for
|
|
the connection to the HTTP proxy.
|
|
|
|
Use \fICURLOPT_PROXYAUTH\fP to specify the authentication method.
|
|
.IP CURLOPT_USERNAME
|
|
Pass a char * as parameter, which should be pointing to the zero terminated
|
|
user name to use for the transfer.
|
|
|
|
\fBCURLOPT_USERNAME\fP sets the user name to be used in protocol
|
|
authentication. You should not use this option together with the (older)
|
|
CURLOPT_USERPWD option.
|
|
|
|
To specify the password and login options, along with the user name, use the
|
|
\fICURLOPT_PASSWORD\fP and \fICURLOPT_OPTIONS\fP options or alternatively use
|
|
the older \CURLOPT_USERPWD\fP option instead. (Added in 7.19.1)
|
|
.IP CURLOPT_PASSWORD
|
|
Pass a char * as parameter, which should be pointing to the zero terminated
|
|
password to use for the transfer.
|
|
|
|
The CURLOPT_PASSWORD option should be used in conjunction with the
|
|
\fICURLOPT_USERNAME\fP option. (Added in 7.19.1)
|
|
.IP CURLOPT_OPTIONS
|
|
Pass a char * as parameter, which should be pointing to the zero terminated
|
|
options string to use for the transfer.
|
|
|
|
\CURLOPT_OPTIONS\fP can be used to set protocol specific authentication options,
|
|
such as the preferred authentication mechanism via "AUTH=NTLM" or "AUTH=*", and
|
|
should be used in conjunction with the \fICURLOPT_USERNAME\fP option. (Added in
|
|
7.34.0)
|
|
.IP CURLOPT_PROXYUSERNAME
|
|
Pass a char * as parameter, which should be pointing to the zero terminated
|
|
user name to use for the transfer while connecting to Proxy.
|
|
|
|
The CURLOPT_PROXYUSERNAME option should be used in same way as the
|
|
\fICURLOPT_PROXYUSERPWD\fP is used. In comparison to
|
|
\fICURLOPT_PROXYUSERPWD\fP the CURLOPT_PROXYUSERNAME allows the username to
|
|
contain a colon, like in the following example: "sip:user@example.com". The
|
|
CURLOPT_PROXYUSERNAME option is an alternative way to set the user name while
|
|
connecting to Proxy. There is no meaning to use it together with the
|
|
\fICURLOPT_PROXYUSERPWD\fP option.
|
|
|
|
In order to specify the password to be used in conjunction with the user name
|
|
use the \fICURLOPT_PROXYPASSWORD\fP option. (Added in 7.19.1)
|
|
.IP CURLOPT_PROXYPASSWORD
|
|
Pass a char * as parameter, which should be pointing to the zero terminated
|
|
password to use for the transfer while connecting to Proxy.
|
|
|
|
The CURLOPT_PROXYPASSWORD option should be used in conjunction with
|
|
the \fICURLOPT_PROXYUSERNAME\fP option. (Added in 7.19.1)
|
|
.IP CURLOPT_HTTPAUTH
|
|
Pass a long as parameter, which is set to a bitmask, to tell libcurl which
|
|
authentication method(s) you want it to use. The available bits are listed
|
|
below. If more than one bit is set, libcurl will first query the site to see
|
|
which authentication methods it supports and then pick the best one you allow
|
|
it to use. For some methods, this will induce an extra network round-trip. Set
|
|
the actual name and password with the \fICURLOPT_USERPWD\fP option or
|
|
with the \fICURLOPT_USERNAME\fP and the \fICURLOPT_PASSWORD\fP options.
|
|
(Added in 7.10.6)
|
|
.RS
|
|
.IP CURLAUTH_BASIC
|
|
HTTP Basic authentication. This is the default choice, and the only method
|
|
that is in wide-spread use and supported virtually everywhere. This sends
|
|
the user name and password over the network in plain text, easily captured by
|
|
others.
|
|
.IP CURLAUTH_DIGEST
|
|
HTTP Digest authentication. Digest authentication is defined in RFC2617 and
|
|
is a more secure way to do authentication over public networks than the
|
|
regular old-fashioned Basic method.
|
|
.IP CURLAUTH_DIGEST_IE
|
|
HTTP Digest authentication with an IE flavor. Digest authentication is
|
|
defined in RFC2617 and is a more secure way to do authentication over public
|
|
networks than the regular old-fashioned Basic method. The IE flavor is simply
|
|
that libcurl will use a special "quirk" that IE is known to have used before
|
|
version 7 and that some servers require the client to use. (This define was
|
|
added in 7.19.3)
|
|
.IP CURLAUTH_GSSNEGOTIATE
|
|
HTTP GSS-Negotiate authentication. The GSS-Negotiate (also known as plain
|
|
\&"Negotiate") method was designed by Microsoft and is used in their web
|
|
applications. It is primarily meant as a support for Kerberos5 authentication
|
|
but may also be used along with other authentication methods. For more
|
|
information see IETF draft draft-brezak-spnego-http-04.txt.
|
|
|
|
You need to build libcurl with a suitable GSS-API library for this to work.
|
|
.IP CURLAUTH_NTLM
|
|
HTTP NTLM authentication. A proprietary protocol invented and used by
|
|
Microsoft. It uses a challenge-response and hash concept similar to Digest, to
|
|
prevent the password from being eavesdropped.
|
|
|
|
You need to build libcurl with either OpenSSL, GnuTLS or NSS support for this
|
|
option to work, or build libcurl on Windows with SSPI support.
|
|
.IP CURLAUTH_NTLM_WB
|
|
NTLM delegating to winbind helper. Authentication is performed by a separate
|
|
binary application that is executed when needed. The name of the application
|
|
is specified at compile time but is typically /usr/bin/ntlm_auth
|
|
(Added in 7.22.0)
|
|
|
|
Note that libcurl will fork when necessary to run the winbind application and
|
|
kill it when complete, calling waitpid() to await its exit when done. On POSIX
|
|
operating systems, killing the process will cause a SIGCHLD signal to be
|
|
raised (regardless of whether \fICURLOPT_NOSIGNAL\fP is set), which must be
|
|
handled intelligently by the application. In particular, the application must
|
|
not unconditionally call wait() in its SIGCHLD signal handler to avoid being
|
|
subject to a race condition. This behavior is subject to change in future
|
|
versions of libcurl.
|
|
.IP CURLAUTH_ANY
|
|
This is a convenience macro that sets all bits and thus makes libcurl pick any
|
|
it finds suitable. libcurl will automatically select the one it finds most
|
|
secure.
|
|
.IP CURLAUTH_ANYSAFE
|
|
This is a convenience macro that sets all bits except Basic and thus makes
|
|
libcurl pick any it finds suitable. libcurl will automatically select the one
|
|
it finds most secure.
|
|
.IP CURLAUTH_ONLY
|
|
This is a meta symbol. Or this value together with a single specific auth
|
|
value to force libcurl to probe for un-restricted auth and if not, only that
|
|
single auth algorithm is acceptable. (Added in 7.21.3)
|
|
.RE
|
|
.IP CURLOPT_TLSAUTH_TYPE
|
|
Pass a long as parameter, which is set to a bitmask, to tell libcurl which
|
|
authentication method(s) you want it to use for TLS authentication.
|
|
.RS
|
|
.IP CURLOPT_TLSAUTH_SRP
|
|
TLS-SRP authentication. Secure Remote Password authentication for TLS is
|
|
defined in RFC5054 and provides mutual authentication if both sides have a
|
|
shared secret. To use TLS-SRP, you must also set the
|
|
\fICURLOPT_TLSAUTH_USERNAME\fP and \fICURLOPT_TLSAUTH_PASSWORD\fP options.
|
|
|
|
You need to build libcurl with GnuTLS or OpenSSL with TLS-SRP support for this
|
|
to work. (Added in 7.21.4)
|
|
.RE
|
|
.IP CURLOPT_TLSAUTH_USERNAME
|
|
Pass a char * as parameter, which should point to the zero terminated username
|
|
to use for the TLS authentication method specified with the
|
|
\fICURLOPT_TLSAUTH_TYPE\fP option. Requires that the
|
|
\fICURLOPT_TLS_PASSWORD\fP option also be set. (Added in 7.21.4)
|
|
.IP CURLOPT_TLSAUTH_PASSWORD
|
|
Pass a char * as parameter, which should point to the zero terminated password
|
|
to use for the TLS authentication method specified with the
|
|
\fICURLOPT_TLSAUTH_TYPE\fP option. Requires that the
|
|
\fICURLOPT_TLS_USERNAME\fP option also be set. (Added in 7.21.4)
|
|
.IP CURLOPT_PROXYAUTH
|
|
Pass a long as parameter, which is set to a bitmask, to tell libcurl which
|
|
authentication method(s) you want it to use for your proxy authentication. If
|
|
more than one bit is set, libcurl will first query the site to see what
|
|
authentication methods it supports and then pick the best one you allow it to
|
|
use. For some methods, this will induce an extra network round-trip. Set the
|
|
actual name and password with the \fICURLOPT_PROXYUSERPWD\fP option. The
|
|
bitmask can be constructed by or'ing together the bits listed above for the
|
|
\fICURLOPT_HTTPAUTH\fP option. As of this writing, only Basic, Digest and NTLM
|
|
work. (Added in 7.10.7)
|
|
.IP CURLOPT_SASL_IR
|
|
Pass a long. If the value is 1, curl will send the initial response to the
|
|
server in the first authentication packet in order to reduce the number of
|
|
ping pong requests. Only applicable to supporting SASL authentication
|
|
mechanisms and to the IMAP, POP3 and SMTP protocols. (Added in 7.31.0)
|
|
|
|
Note: Whilst IMAP supports this option there is no need to explicitly set it,
|
|
as libcurl can determine the feature itself when the server supports the
|
|
SASL-IR CAPABILITY.
|
|
.IP CURLOPT_BEARER
|
|
Pass a char * as parameter, which should point to the zero terminated OAUTH
|
|
2.0 Bearer Access Token for use with IMAP. POP3 and SMTP servers that support
|
|
the OAUTH 2.0 Authorization Framework. (Added in 7.33.0)
|
|
|
|
Note: The user name used to generate the Bearer Token should be supplied via
|
|
the \fICURLOPT_USERNAME\fP option.
|
|
.SH HTTP OPTIONS
|
|
.IP CURLOPT_AUTOREFERER
|
|
Pass a parameter set to 1 to enable this. When enabled, libcurl will
|
|
automatically set the Referer: field in requests where it follows a Location:
|
|
redirect.
|
|
.IP CURLOPT_ACCEPT_ENCODING
|
|
Sets the contents of the Accept-Encoding: header sent in a HTTP request, and
|
|
enables decoding of a response when a Content-Encoding: header is received.
|
|
Three encodings are supported: \fIidentity\fP, which does nothing,
|
|
\fIdeflate\fP which requests the server to compress its response using the
|
|
zlib algorithm, and \fIgzip\fP which requests the gzip algorithm. If a
|
|
zero-length string is set, then an Accept-Encoding: header containing all
|
|
supported encodings is sent.
|
|
|
|
This is a request, not an order; the server may or may not do it. This option
|
|
must be set (to any non-NULL value) or else any unsolicited encoding done by
|
|
the server is ignored. See the special file lib/README.encoding for details.
|
|
|
|
(This option was called CURLOPT_ENCODING before 7.21.6)
|
|
.IP CURLOPT_TRANSFER_ENCODING
|
|
Adds a request for compressed Transfer Encoding in the outgoing HTTP
|
|
request. If the server supports this and so desires, it can respond with the
|
|
HTTP response sent using a compressed Transfer-Encoding that will be
|
|
automatically uncompressed by libcurl on reception.
|
|
|
|
Transfer-Encoding differs slightly from the Content-Encoding you ask for with
|
|
\fBCURLOPT_ACCEPT_ENCODING\fP in that a Transfer-Encoding is strictly meant to
|
|
be for the transfer and thus MUST be decoded before the data arrives in the
|
|
client. Traditionally, Transfer-Encoding has been much less used and supported
|
|
by both HTTP clients and HTTP servers.
|
|
|
|
(Added in 7.21.6)
|
|
.IP CURLOPT_FOLLOWLOCATION
|
|
A parameter set to 1 tells the library to follow any Location: header that the
|
|
server sends as part of a HTTP header.
|
|
|
|
This means that the library will re-send the same request on the new location
|
|
and follow new Location: headers all the way until no more such headers are
|
|
returned. \fICURLOPT_MAXREDIRS\fP can be used to limit the number of redirects
|
|
libcurl will follow.
|
|
|
|
Since 7.19.4, libcurl can limit what protocols it will automatically
|
|
follow. The accepted protocols are set with \fICURLOPT_REDIR_PROTOCOLS\fP and
|
|
it excludes the FILE protocol by default.
|
|
.IP CURLOPT_UNRESTRICTED_AUTH
|
|
A parameter set to 1 tells the library it can continue to send authentication
|
|
(user+password) when following locations, even when hostname changed. This
|
|
option is meaningful only when setting \fICURLOPT_FOLLOWLOCATION\fP.
|
|
.IP CURLOPT_MAXREDIRS
|
|
Pass a long. The set number will be the redirection limit. If that many
|
|
redirections have been followed, the next redirect will cause an error
|
|
(\fICURLE_TOO_MANY_REDIRECTS\fP). This option only makes sense if the
|
|
\fICURLOPT_FOLLOWLOCATION\fP is used at the same time. Added in 7.15.1:
|
|
Setting the limit to 0 will make libcurl refuse any redirect. Set it to -1 for
|
|
an infinite number of redirects (which is the default)
|
|
.IP CURLOPT_POSTREDIR
|
|
Pass a bitmask to control how libcurl acts on redirects after POSTs that get a
|
|
301, 302 or 303 response back. A parameter with bit 0 set (value
|
|
\fBCURL_REDIR_POST_301\fP) tells the library to respect RFC2616/10.3.2 and not
|
|
convert POST requests into GET requests when following a 301 redirection.
|
|
Setting bit 1 (value \fBCURL_REDIR_POST_302\fP) makes libcurl maintain the
|
|
request method after a 302 redirect whilst setting bit 2 (value
|
|
\fBCURL_REDIR_POST_303\fP) makes libcurl maintain the request method after a
|
|
303 redirect. The value \fBCURL_REDIR_POST_ALL\fP is a convenience define that
|
|
sets all three bits.
|
|
|
|
The non-RFC behaviour is ubiquitous in web browsers, so the library does the
|
|
conversion by default to maintain consistency. However, a server may require a
|
|
POST to remain a POST after such a redirection. This option is meaningful only
|
|
when setting \fICURLOPT_FOLLOWLOCATION\fP. (Added in 7.17.1) (This option was
|
|
known as CURLOPT_POST301 up to 7.19.0 as it only supported the 301 then)
|
|
.IP CURLOPT_PUT
|
|
A parameter set to 1 tells the library to use HTTP PUT to transfer data. The
|
|
data should be set with \fICURLOPT_READDATA\fP and \fICURLOPT_INFILESIZE\fP.
|
|
|
|
This option is deprecated and starting with version 7.12.1 you should instead
|
|
use \fICURLOPT_UPLOAD\fP.
|
|
.IP CURLOPT_POST
|
|
A parameter set to 1 tells the library to do a regular HTTP post. This will
|
|
also make the library use a "Content-Type:
|
|
application/x-www-form-urlencoded" header. (This is by far the most commonly
|
|
used POST method).
|
|
|
|
Use one of \fICURLOPT_POSTFIELDS\fP or \fICURLOPT_COPYPOSTFIELDS\fP options to
|
|
specify what data to post and \fICURLOPT_POSTFIELDSIZE\fP or
|
|
\fICURLOPT_POSTFIELDSIZE_LARGE\fP to set the data size.
|
|
|
|
Optionally, you can provide data to POST using the \fICURLOPT_READFUNCTION\fP
|
|
and \fICURLOPT_READDATA\fP options but then you must make sure to not set
|
|
\fICURLOPT_POSTFIELDS\fP to anything but NULL. When providing data with a
|
|
callback, you must transmit it using chunked transfer-encoding or you must set
|
|
the size of the data with the \fICURLOPT_POSTFIELDSIZE\fP or
|
|
\fICURLOPT_POSTFIELDSIZE_LARGE\fP option. To enable chunked encoding, you
|
|
simply pass in the appropriate Transfer-Encoding header, see the
|
|
post-callback.c example.
|
|
|
|
You can override the default POST Content-Type: header by setting your own
|
|
with \fICURLOPT_HTTPHEADER\fP.
|
|
|
|
Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
|
|
You can disable this header with \fICURLOPT_HTTPHEADER\fP as usual.
|
|
|
|
If you use POST to a HTTP 1.1 server, you can send data without knowing the
|
|
size before starting the POST if you use chunked encoding. You enable this by
|
|
adding a header like "Transfer-Encoding: chunked" with
|
|
\fICURLOPT_HTTPHEADER\fP. With HTTP 1.0 or without chunked transfer, you must
|
|
specify the size in the request.
|
|
|
|
When setting \fICURLOPT_POST\fP to 1, it will automatically set
|
|
\fICURLOPT_NOBODY\fP to 0 (since 7.14.1).
|
|
|
|
If you issue a POST request and then want to make a HEAD or GET using the same
|
|
re-used handle, you must explicitly set the new request type using
|
|
\fICURLOPT_NOBODY\fP or \fICURLOPT_HTTPGET\fP or similar.
|
|
.IP CURLOPT_POSTFIELDS
|
|
Pass a void * as parameter, which should be the full data to post in a HTTP
|
|
POST operation. You must make sure that the data is formatted the way you want
|
|
the server to receive it. libcurl will not convert or encode it for you. Most
|
|
web servers will assume this data to be url-encoded.
|
|
|
|
The pointed data are NOT copied by the library: as a consequence, they must
|
|
be preserved by the calling application until the transfer finishes.
|
|
|
|
This POST is a normal application/x-www-form-urlencoded kind (and libcurl will
|
|
set that Content-Type by default when this option is used), which is the most
|
|
commonly used one by HTML forms. See also the \fICURLOPT_POST\fP. Using
|
|
\fICURLOPT_POSTFIELDS\fP implies \fICURLOPT_POST\fP.
|
|
|
|
If you want to do a zero-byte POST, you need to set
|
|
\fICURLOPT_POSTFIELDSIZE\fP explicitly to zero, as simply setting
|
|
\fICURLOPT_POSTFIELDS\fP to NULL or "" just effectively disables the sending
|
|
of the specified string. libcurl will instead assume that you'll send the POST
|
|
data using the read callback!
|
|
|
|
Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
|
|
You can disable this header with \fICURLOPT_HTTPHEADER\fP as usual.
|
|
|
|
To make multipart/formdata posts (aka RFC2388-posts), check out the
|
|
\fICURLOPT_HTTPPOST\fP option.
|
|
.IP CURLOPT_POSTFIELDSIZE
|
|
If you want to post data to the server without letting libcurl do a strlen()
|
|
to measure the data size, this option must be used. When this option is used
|
|
you can post fully binary data, which otherwise is likely to fail. If this
|
|
size is set to -1, the library will use strlen() to get the size.
|
|
.IP CURLOPT_POSTFIELDSIZE_LARGE
|
|
Pass a curl_off_t as parameter. Use this to set the size of the
|
|
\fICURLOPT_POSTFIELDS\fP data to prevent libcurl from doing strlen() on the
|
|
data to figure out the size. This is the large file version of the
|
|
\fICURLOPT_POSTFIELDSIZE\fP option. (Added in 7.11.1)
|
|
.IP CURLOPT_COPYPOSTFIELDS
|
|
Pass a char * as parameter, which should be the full data to post in a HTTP
|
|
POST operation. It behaves as the \fICURLOPT_POSTFIELDS\fP option, but the
|
|
original data are copied by the library, allowing the application to overwrite
|
|
the original data after setting this option.
|
|
|
|
Because data are copied, care must be taken when using this option in
|
|
conjunction with \fICURLOPT_POSTFIELDSIZE\fP or
|
|
\fICURLOPT_POSTFIELDSIZE_LARGE\fP: If the size has not been set prior to
|
|
\fICURLOPT_COPYPOSTFIELDS\fP, the data are assumed to be a NUL-terminated
|
|
string; else the stored size informs the library about the data byte count to
|
|
copy. In any case, the size must not be changed after
|
|
\fICURLOPT_COPYPOSTFIELDS\fP, unless another \fICURLOPT_POSTFIELDS\fP or
|
|
\fICURLOPT_COPYPOSTFIELDS\fP option is issued.
|
|
(Added in 7.17.1)
|
|
.IP CURLOPT_HTTPPOST
|
|
Tells libcurl you want a multipart/formdata HTTP POST to be made and you
|
|
instruct what data to pass on to the server. Pass a pointer to a linked list
|
|
of curl_httppost structs as parameter. The easiest way to create such a
|
|
list, is to use \fIcurl_formadd(3)\fP as documented. The data in this list
|
|
must remain intact until you close this curl handle again with
|
|
\fIcurl_easy_cleanup(3)\fP.
|
|
|
|
Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
|
|
You can disable this header with \fICURLOPT_HTTPHEADER\fP as usual.
|
|
|
|
When setting \fICURLOPT_HTTPPOST\fP, it will automatically set
|
|
\fICURLOPT_NOBODY\fP to 0 (since 7.14.1).
|
|
.IP CURLOPT_REFERER
|
|
Pass a pointer to a zero terminated string as parameter. It will be used to
|
|
set the Referer: header in the http request sent to the remote server. This
|
|
can be used to fool servers or scripts. You can also set any custom header
|
|
with \fICURLOPT_HTTPHEADER\fP.
|
|
.IP CURLOPT_USERAGENT
|
|
Pass a pointer to a zero terminated string as parameter. It will be used to
|
|
set the User-Agent: header in the http request sent to the remote server. This
|
|
can be used to fool servers or scripts. You can also set any custom header
|
|
with \fICURLOPT_HTTPHEADER\fP.
|
|
.IP CURLOPT_HTTPHEADER
|
|
Pass a pointer to a linked list of HTTP headers to pass to the server in your
|
|
HTTP request. The linked list should be a fully valid list of \fBstruct
|
|
curl_slist\fP structs properly filled in. Use \fIcurl_slist_append(3)\fP to
|
|
create the list and \fIcurl_slist_free_all(3)\fP to clean up an entire
|
|
list. If you add a header that is otherwise generated and used by libcurl
|
|
internally, your added one will be used instead. If you add a header with no
|
|
content as in 'Accept:' (no data on the right side of the colon), the
|
|
internally used header will get disabled. Thus, using this option you can add
|
|
new headers, replace internal headers and remove internal headers. To add a
|
|
header with no content (nothing to the right side of the colon), use the
|
|
form 'MyHeader;' (note the ending semicolon).
|
|
|
|
The headers included in the linked list must not be CRLF-terminated, because
|
|
curl adds CRLF after each header item. Failure to comply with this will result
|
|
in strange bugs because the server will most likely ignore part of the headers
|
|
you specified.
|
|
|
|
The first line in a request (containing the method, usually a GET or POST) is
|
|
not a header and cannot be replaced using this option. Only the lines
|
|
following the request-line are headers. Adding this method line in this list
|
|
of headers will only cause your request to send an invalid header.
|
|
|
|
Pass a NULL to this to reset back to no custom headers.
|
|
|
|
The most commonly replaced headers have "shortcuts" in the options
|
|
\fICURLOPT_COOKIE\fP, \fICURLOPT_USERAGENT\fP and \fICURLOPT_REFERER\fP.
|
|
.IP CURLOPT_HTTP200ALIASES
|
|
Pass a pointer to a linked list of aliases to be treated as valid HTTP 200
|
|
responses. Some servers respond with a custom header response line. For
|
|
example, IceCast servers respond with "ICY 200 OK". By including this string
|
|
in your list of aliases, the response will be treated as a valid HTTP header
|
|
line such as "HTTP/1.0 200 OK". (Added in 7.10.3)
|
|
|
|
The linked list should be a fully valid list of struct curl_slist structs, and
|
|
be properly filled in. Use \fIcurl_slist_append(3)\fP to create the list and
|
|
\fIcurl_slist_free_all(3)\fP to clean up an entire list.
|
|
|
|
The alias itself is not parsed for any version strings. Before libcurl 7.16.3,
|
|
Libcurl used the value set by option \fICURLOPT_HTTP_VERSION\fP, but starting
|
|
with 7.16.3 the protocol is assumed to match HTTP 1.0 when an alias matched.
|
|
.IP CURLOPT_COOKIE
|
|
Pass a pointer to a zero terminated string as parameter. It will be used to
|
|
set a cookie in the http request. The format of the string should be
|
|
NAME=CONTENTS, where NAME is the cookie name and CONTENTS is what the cookie
|
|
should contain.
|
|
|
|
If you need to set multiple cookies, you need to set them all using a single
|
|
option and thus you need to concatenate them all in one single string. Set
|
|
multiple cookies in one string like this: "name1=content1; name2=content2;"
|
|
etc.
|
|
|
|
This option sets the cookie header explicitly in the outgoing request(s). If
|
|
multiple requests are done due to authentication, followed redirections or
|
|
similar, they will all get this cookie passed on.
|
|
|
|
Using this option multiple times will only make the latest string override the
|
|
previous ones.
|
|
.IP CURLOPT_COOKIEFILE
|
|
Pass a pointer to a zero terminated string as parameter. It should contain the
|
|
name of your file holding cookie data to read. The cookie data may be in
|
|
Netscape / Mozilla cookie data format or just regular HTTP-style headers
|
|
dumped to a file.
|
|
|
|
Given an empty or non-existing file or by passing the empty string (""), this
|
|
option will enable cookies for this curl handle, making it understand and
|
|
parse received cookies and then use matching cookies in future requests.
|
|
|
|
If you use this option multiple times, you just add more files to read.
|
|
Subsequent files will add more cookies.
|
|
.IP CURLOPT_COOKIEJAR
|
|
Pass a file name as char *, zero terminated. This will make libcurl write all
|
|
internally known cookies to the specified file when \fIcurl_easy_cleanup(3)\fP
|
|
is called. If no cookies are known, no file will be created. Specify "-" to
|
|
instead have the cookies written to stdout. Using this option also enables
|
|
cookies for this session, so if you for example follow a location it will make
|
|
matching cookies get sent accordingly.
|
|
|
|
If the cookie jar file can't be created or written to (when the
|
|
\fIcurl_easy_cleanup(3)\fP is called), libcurl will not and cannot report an
|
|
error for this. Using \fICURLOPT_VERBOSE\fP or \fICURLOPT_DEBUGFUNCTION\fP
|
|
will get a warning to display, but that is the only visible feedback you get
|
|
about this possibly lethal situation.
|
|
.IP CURLOPT_COOKIESESSION
|
|
Pass a long set to 1 to mark this as a new cookie "session". It will force
|
|
libcurl to ignore all cookies it is about to load that are "session cookies"
|
|
from the previous session. By default, libcurl always stores and loads all
|
|
cookies, independent if they are session cookies or not. Session cookies are
|
|
cookies without expiry date and they are meant to be alive and existing for
|
|
this "session" only.
|
|
.IP CURLOPT_COOKIELIST
|
|
Pass a char * to a cookie string. Cookie can be either in Netscape / Mozilla
|
|
format or just regular HTTP-style header (Set-Cookie: ...) format. If cURL
|
|
cookie engine was not enabled it will enable its cookie engine. Passing a
|
|
magic string \&"ALL" will erase all cookies known by cURL. (Added in 7.14.1)
|
|
Passing the special string \&"SESS" will only erase all session cookies known
|
|
by cURL. (Added in 7.15.4) Passing the special string \&"FLUSH" will write
|
|
all cookies known by cURL to the file specified by \fICURLOPT_COOKIEJAR\fP.
|
|
(Added in 7.17.1)
|
|
.IP CURLOPT_HTTPGET
|
|
Pass a long. If the long is 1, this forces the HTTP request to get back
|
|
to GET. Usable if a POST, HEAD, PUT, or a custom request has been used
|
|
previously using the same curl handle.
|
|
|
|
When setting \fICURLOPT_HTTPGET\fP to 1, it will automatically set
|
|
\fICURLOPT_NOBODY\fP to 0 and \fICURLOPT_UPLOAD\fP to 0.
|
|
.IP CURLOPT_HTTP_VERSION
|
|
Pass a long, set to one of the values described below. They force libcurl to
|
|
use the specific HTTP versions. This is not sensible to do unless you have a
|
|
good reason.
|
|
.RS
|
|
.IP CURL_HTTP_VERSION_NONE
|
|
We don't care about what version the library uses. libcurl will use whatever
|
|
it thinks fit.
|
|
.IP CURL_HTTP_VERSION_1_0
|
|
Enforce HTTP 1.0 requests.
|
|
.IP CURL_HTTP_VERSION_1_1
|
|
Enforce HTTP 1.1 requests.
|
|
.RE
|
|
.IP CURLOPT_IGNORE_CONTENT_LENGTH
|
|
Ignore the Content-Length header. This is useful for Apache 1.x (and similar
|
|
servers) which will report incorrect content length for files over 2
|
|
gigabytes. If this option is used, curl will not be able to accurately report
|
|
progress, and will simply stop the download when the server ends the
|
|
connection. (added in 7.14.1)
|
|
.IP CURLOPT_HTTP_CONTENT_DECODING
|
|
Pass a long to tell libcurl how to act on content decoding. If set to zero,
|
|
content decoding will be disabled. If set to 1 it is enabled. Libcurl has no
|
|
default content decoding but requires you to use \fICURLOPT_ACCEPT_ENCODING\fP
|
|
for that. (added in 7.16.2)
|
|
.IP CURLOPT_HTTP_TRANSFER_DECODING
|
|
Pass a long to tell libcurl how to act on transfer decoding. If set to zero,
|
|
transfer decoding will be disabled, if set to 1 it is enabled
|
|
(default). libcurl does chunked transfer decoding by default unless this
|
|
option is set to zero. (added in 7.16.2)
|
|
.SH SMTP OPTIONS
|
|
.IP CURLOPT_MAIL_FROM
|
|
Pass a pointer to a zero terminated string as parameter. This should be used
|
|
to specify the sender's email address when sending SMTP mail with libcurl.
|
|
|
|
An originator email address should be specified with angled brackets (<>)
|
|
around it, which if not specified, will be added by libcurl from version
|
|
7.21.4 onwards. Failing to provide such brackets may cause the server to
|
|
reject the email.
|
|
|
|
If this parameter is not specified then an empty address will be sent to the
|
|
mail server which may or may not cause the email to be rejected.
|
|
|
|
(Added in 7.20.0)
|
|
.IP CURLOPT_MAIL_RCPT
|
|
Pass a pointer to a linked list of recipients to pass to the server in your
|
|
SMTP mail request. The linked list should be a fully valid list of \fBstruct
|
|
curl_slist\fP structs properly filled in. Use \fIcurl_slist_append(3)\fP to
|
|
create the list and \fIcurl_slist_free_all(3)\fP to clean up an entire list.
|
|
|
|
Each recipient should be specified within a pair of angled brackets (<>),
|
|
however, should you not use an angled bracket as the first character libcurl
|
|
will assume you provided a single email address and enclose that address
|
|
within brackets for you.
|
|
|
|
(Added in 7.20.0)
|
|
.IP CURLOPT_MAIL_AUTH
|
|
Pass a pointer to a zero terminated string as parameter. This will be used
|
|
to specify the authentication address (identity) of a submitted message that
|
|
is being relayed to another server.
|
|
|
|
This optional parameter allows co-operating agents in a trusted environment to
|
|
communicate the authentication of individual messages and should only be used
|
|
by the application program, using libcurl, if the application is itself a
|
|
mail server acting in such an environment. If the application is operating as
|
|
such and the AUTH address is not known or is invalid, then an empty string
|
|
should be used for this parameter.
|
|
|
|
Unlike CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT, the address should not be
|
|
specified within a pair of angled brackets (<>). However, if an empty string
|
|
is used then a pair of brackets will be sent by libcurl as required by
|
|
RFC2554.
|
|
|
|
(Added in 7.25.0)
|
|
.SH TFTP OPTIONS
|
|
.IP CURLOPT_TFTP_BLKSIZE
|
|
Specify block size to use for TFTP data transmission. Valid range as per
|
|
RFC2348 is 8-65464 bytes. The default of 512 bytes will be used if this option
|
|
is not specified. The specified block size will only be used pending support
|
|
by the remote server. If the server does not return an option acknowledgement
|
|
or returns an option acknowledgement with no blksize, the default of 512 bytes
|
|
will be used. (added in 7.19.4)
|
|
.SH FTP OPTIONS
|
|
.IP CURLOPT_FTPPORT
|
|
Pass a pointer to a zero terminated string as parameter. It will be used to
|
|
get the IP address to use for the FTP PORT instruction. The PORT instruction
|
|
tells the remote server to connect to our specified IP address. The string may
|
|
be a plain IP address, a host name, a network interface name (under Unix) or
|
|
just a '-' symbol to let the library use your system's default IP
|
|
address. Default FTP operations are passive, and thus won't use PORT.
|
|
|
|
The address can be followed by a ':' to specify a port, optionally followed by
|
|
a '-' to specify a port range. If the port specified is 0, the operating
|
|
system will pick a free port. If a range is provided and all ports in the
|
|
range are not available, libcurl will report CURLE_FTP_PORT_FAILED for the
|
|
handle. Invalid port/range settings are ignored. IPv6 addresses followed by
|
|
a port or portrange have to be in brackets. IPv6 addresses without port/range
|
|
specifier can be in brackets. (added in 7.19.5)
|
|
|
|
Examples with specified ports:
|
|
|
|
.nf
|
|
eth0:0
|
|
192.168.1.2:32000-33000
|
|
curl.se:32123
|
|
[::1]:1234-4567
|
|
.fi
|
|
|
|
You disable PORT again and go back to using the passive version by setting
|
|
this option to NULL.
|
|
.IP CURLOPT_QUOTE
|
|
Pass a pointer to a linked list of FTP or SFTP commands to pass to the server
|
|
prior to your FTP request. This will be done before any other commands are
|
|
issued (even before the CWD command for FTP). The linked list should be a
|
|
fully valid list of 'struct curl_slist' structs properly filled in with text
|
|
strings. Use \fIcurl_slist_append(3)\fP to append strings (commands) to the
|
|
list, and clear the entire list afterwards with
|
|
\fIcurl_slist_free_all(3)\fP. Disable this operation again by setting a NULL
|
|
to this option. When speaking to a FTP (or SFTP since 7.24.0) server, prefix
|
|
the command with an asterisk (*) to make libcurl continue even if the command
|
|
fails as by default libcurl will stop at first failure.
|
|
|
|
The set of valid FTP commands depends on the server (see RFC959 for a list of
|
|
mandatory commands).
|
|
|
|
The valid SFTP commands are: chgrp, chmod, chown, ln, mkdir, pwd, rename, rm,
|
|
rmdir, symlink (see
|
|
.BR curl (1))
|
|
(SFTP support added in 7.16.3)
|
|
.IP CURLOPT_POSTQUOTE
|
|
Pass a pointer to a linked list of FTP or SFTP commands to pass to the server
|
|
after your FTP transfer request. The commands will only be run if no error
|
|
occurred. The linked list should be a fully valid list of struct curl_slist
|
|
structs properly filled in as described for \fICURLOPT_QUOTE\fP. Disable this
|
|
operation again by setting a NULL to this option.
|
|
.IP CURLOPT_PREQUOTE
|
|
Pass a pointer to a linked list of FTP commands to pass to the server after
|
|
the transfer type is set. The linked list should be a fully valid list of
|
|
struct curl_slist structs properly filled in as described for
|
|
\fICURLOPT_QUOTE\fP. Disable this operation again by setting a NULL to this
|
|
option. Before version 7.16.0, if you also set \fICURLOPT_NOBODY\fP to 1, this
|
|
option didn't work.
|
|
.IP CURLOPT_DIRLISTONLY
|
|
A parameter set to 1 tells the library to just list the names of files in a
|
|
directory, instead of doing a full directory listing that would include file
|
|
sizes, dates etc. This works for FTP and SFTP URLs.
|
|
|
|
This causes an FTP NLST command to be sent on an FTP server. Beware that some
|
|
FTP servers list only files in their response to NLST; they might not include
|
|
subdirectories and symbolic links.
|
|
|
|
Setting this option to 1 also implies a directory listing even if the URL
|
|
doesn't end with a slash, which otherwise is necessary.
|
|
|
|
Do NOT use this option if you also use \fICURLOPT_WILDCARDMATCH\fP as it will
|
|
effectively break that feature then.
|
|
|
|
(This option was known as CURLOPT_FTPLISTONLY up to 7.16.4)
|
|
.IP CURLOPT_APPEND
|
|
A parameter set to 1 tells the library to append to the remote file instead of
|
|
overwrite it. This is only useful when uploading to an FTP site.
|
|
|
|
(This option was known as CURLOPT_FTPAPPEND up to 7.16.4)
|
|
.IP CURLOPT_FTP_USE_EPRT
|
|
Pass a long. If the value is 1, it tells curl to use the EPRT (and
|
|
LPRT) command when doing active FTP downloads (which is enabled by
|
|
\fICURLOPT_FTPPORT\fP). Using EPRT means that it will first attempt to use
|
|
EPRT and then LPRT before using PORT, but if you pass zero to this
|
|
option, it will not try using EPRT or LPRT, only plain PORT. (Added in 7.10.5)
|
|
|
|
If the server is an IPv6 host, this option will have no effect as of 7.12.3.
|
|
.IP CURLOPT_FTP_USE_EPSV
|
|
Pass a long. If the value is 1, it tells curl to use the EPSV command
|
|
when doing passive FTP downloads (which it always does by default). Using EPSV
|
|
means that it will first attempt to use EPSV before using PASV, but if you
|
|
pass zero to this option, it will not try using EPSV, only plain PASV.
|
|
|
|
If the server is an IPv6 host, this option will have no effect as of 7.12.3.
|
|
.IP CURLOPT_FTP_USE_PRET
|
|
Pass a long. If the value is 1, it tells curl to send a PRET command before
|
|
PASV (and EPSV). Certain FTP servers, mainly drftpd, require this non-standard
|
|
command for directory listings as well as up and downloads in PASV mode. Has
|
|
no effect when using the active FTP transfers mode. (Added in 7.20.0)
|
|
.IP CURLOPT_FTP_CREATE_MISSING_DIRS
|
|
Pass a long. If the value is 1, curl will attempt to create any remote
|
|
directory that it fails to CWD into. CWD is the command that changes working
|
|
directory. (Added in 7.10.7)
|
|
|
|
This setting also applies to SFTP-connections. curl will attempt to create
|
|
the remote directory if it can't obtain a handle to the target-location. The
|
|
creation will fail if a file of the same name as the directory to create
|
|
already exists or lack of permissions prevents creation. (Added in 7.16.3)
|
|
|
|
Starting with 7.19.4, you can also set this value to 2, which will make
|
|
libcurl retry the CWD command again if the subsequent MKD command fails. This
|
|
is especially useful if you're doing many simultaneous connections against the
|
|
same server and they all have this option enabled, as then CWD may first fail
|
|
but then another connection does MKD before this connection and thus MKD fails
|
|
but trying CWD works! 7.19.4 also introduced the \fICURLFTP_CREATE_DIR\fP and
|
|
\fICURLFTP_CREATE_DIR_RETRY\fP enum names for these arguments.
|
|
|
|
Before version 7.19.4, libcurl will simply ignore arguments set to 2 and act
|
|
as if 1 was selected.
|
|
.IP CURLOPT_FTP_RESPONSE_TIMEOUT
|
|
Pass a long. Causes curl to set a timeout period (in seconds) on the amount
|
|
of time that the server is allowed to take in order to generate a response
|
|
message for a command before the session is considered hung. While curl is
|
|
waiting for a response, this value overrides \fICURLOPT_TIMEOUT\fP. It is
|
|
recommended that if used in conjunction with \fICURLOPT_TIMEOUT\fP, you set
|
|
\fICURLOPT_FTP_RESPONSE_TIMEOUT\fP to a value smaller than
|
|
\fICURLOPT_TIMEOUT\fP. (Added in 7.10.8)
|
|
.IP CURLOPT_FTP_ALTERNATIVE_TO_USER
|
|
Pass a char * as parameter, pointing to a string which will be used to
|
|
authenticate if the usual FTP "USER user" and "PASS password" negotiation
|
|
fails. This is currently only known to be required when connecting to
|
|
Tumbleweed's Secure Transport FTPS server using client certificates for
|
|
authentication. (Added in 7.15.5)
|
|
.IP CURLOPT_FTP_SKIP_PASV_IP
|
|
Pass a long. If set to 1, it instructs libcurl to not use the IP address the
|
|
server suggests in its 227-response to libcurl's PASV command when libcurl
|
|
connects the data connection. Instead libcurl will re-use the same IP address
|
|
it already uses for the control connection. But it will use the port number
|
|
from the 227-response. (Added in 7.14.2)
|
|
|
|
This option has no effect if PORT, EPRT or EPSV is used instead of PASV.
|
|
.IP CURLOPT_FTPSSLAUTH
|
|
Pass a long using one of the values from below, to alter how libcurl issues
|
|
\&"AUTH TLS" or "AUTH SSL" when FTP over SSL is activated (see
|
|
\fICURLOPT_USE_SSL\fP). (Added in 7.12.2)
|
|
.RS
|
|
.IP CURLFTPAUTH_DEFAULT
|
|
Allow libcurl to decide.
|
|
.IP CURLFTPAUTH_SSL
|
|
Try "AUTH SSL" first, and only if that fails try "AUTH TLS".
|
|
.IP CURLFTPAUTH_TLS
|
|
Try "AUTH TLS" first, and only if that fails try "AUTH SSL".
|
|
.RE
|
|
.IP CURLOPT_FTP_SSL_CCC
|
|
If enabled, this option makes libcurl use CCC (Clear Command Channel). It
|
|
shuts down the SSL/TLS layer after authenticating. The rest of the
|
|
control channel communication will be unencrypted. This allows NAT routers
|
|
to follow the FTP transaction. Pass a long using one of the values below.
|
|
(Added in 7.16.1)
|
|
.RS
|
|
.IP CURLFTPSSL_CCC_NONE
|
|
Don't attempt to use CCC.
|
|
.IP CURLFTPSSL_CCC_PASSIVE
|
|
Do not initiate the shutdown, but wait for the server to do it. Do not send
|
|
a reply.
|
|
.IP CURLFTPSSL_CCC_ACTIVE
|
|
Initiate the shutdown and wait for a reply.
|
|
.RE
|
|
.IP CURLOPT_FTP_ACCOUNT
|
|
Pass a pointer to a zero terminated string (or NULL to disable). When an FTP
|
|
server asks for "account data" after user name and password has been provided,
|
|
this data is sent off using the ACCT command. (Added in 7.13.0)
|
|
.IP CURLOPT_FTP_FILEMETHOD
|
|
Pass a long that should have one of the following values. This option controls
|
|
what method libcurl should use to reach a file on a FTP(S) server. The
|
|
argument should be one of the following alternatives:
|
|
.RS
|
|
.IP CURLFTPMETHOD_MULTICWD
|
|
libcurl does a single CWD operation for each path part in the given URL. For
|
|
deep hierarchies this means many commands. This is how RFC1738 says it
|
|
should be done. This is the default but the slowest behavior.
|
|
.IP CURLFTPMETHOD_NOCWD
|
|
libcurl does no CWD at all. libcurl will do SIZE, RETR, STOR etc and give a
|
|
full path to the server for all these commands. This is the fastest behavior.
|
|
.IP CURLFTPMETHOD_SINGLECWD
|
|
libcurl does one CWD with the full target directory and then operates on the
|
|
file \&"normally" (like in the multicwd case). This is somewhat more standards
|
|
compliant than 'nocwd' but without the full penalty of 'multicwd'.
|
|
.RE
|
|
(Added in 7.15.1)
|
|
.SH RTSP OPTIONS
|
|
.IP CURLOPT_RTSP_REQUEST
|
|
Tell libcurl what kind of RTSP request to make. Pass one of the following RTSP
|
|
enum values. Unless noted otherwise, commands require the Session ID to be
|
|
initialized. (Added in 7.20.0)
|
|
.RS
|
|
.IP CURL_RTSPREQ_OPTIONS
|
|
Used to retrieve the available methods of the server. The application is
|
|
responsible for parsing and obeying the response. \fB(The session ID is not
|
|
needed for this method.)\fP (Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_DESCRIBE
|
|
Used to get the low level description of a stream. The application should note
|
|
what formats it understands in the \fI'Accept:'\fP header. Unless set
|
|
manually, libcurl will automatically fill in \fI'Accept:
|
|
application/sdp'\fP. Time-condition headers will be added to Describe requests
|
|
if the \fICURLOPT_TIMECONDITION\fP option is active. \fB(The session ID is not
|
|
needed for this method)\fP (Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_ANNOUNCE
|
|
When sent by a client, this method changes the description of the session. For
|
|
example, if a client is using the server to record a meeting, the client can
|
|
use Announce to inform the server of all the meta-information about the
|
|
session. ANNOUNCE acts like a HTTP PUT or POST just like
|
|
\fICURL_RTSPREQ_SET_PARAMETER\fP (Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_SETUP
|
|
Setup is used to initialize the transport layer for the session. The
|
|
application must set the desired Transport options for a session by using the
|
|
\fICURLOPT_RTSP_TRANSPORT\fP option prior to calling setup. If no session ID
|
|
is currently set with \fICURLOPT_RTSP_SESSION_ID\fP, libcurl will extract and
|
|
use the session ID in the response to this request. \fB(The session ID is not
|
|
needed for this method).\fP (Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_PLAY
|
|
Send a Play command to the server. Use the \fICURLOPT_RANGE\fP option to
|
|
modify the playback time (e.g. 'npt=10-15'). (Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_PAUSE
|
|
Send a Pause command to the server. Use the \fICURLOPT_RANGE\fP option with a
|
|
single value to indicate when the stream should be halted. (e.g. npt='25')
|
|
(Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_TEARDOWN
|
|
This command terminates an RTSP session. Simply closing a connection does not
|
|
terminate the RTSP session since it is valid to control an RTSP session over
|
|
different connections. (Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_GET_PARAMETER
|
|
Retrieve a parameter from the server. By default, libcurl will automatically
|
|
include a \fIContent-Type: text/parameters\fP header on all non-empty requests
|
|
unless a custom one is set. GET_PARAMETER acts just like a HTTP PUT or POST
|
|
(see \fICURL_RTSPREQ_SET_PARAMETER\fP).
|
|
Applications wishing to send a heartbeat message (e.g. in the presence of a
|
|
server-specified timeout) should send use an empty GET_PARAMETER request.
|
|
(Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_SET_PARAMETER
|
|
Set a parameter on the server. By default, libcurl will automatically include
|
|
a \fIContent-Type: text/parameters\fP header unless a custom one is set. The
|
|
interaction with SET_PARAMTER is much like a HTTP PUT or POST. An application
|
|
may either use \fICURLOPT_UPLOAD\fP with \fICURLOPT_READDATA\fP like a HTTP
|
|
PUT, or it may use \fICURLOPT_POSTFIELDS\fP like a HTTP POST. No chunked
|
|
transfers are allowed, so the application must set the
|
|
\fICURLOPT_INFILESIZE\fP in the former and \fICURLOPT_POSTFIELDSIZE\fP in the
|
|
latter. Also, there is no use of multi-part POSTs within RTSP. (Added in
|
|
7.20.0)
|
|
.IP CURL_RTSPREQ_RECORD
|
|
Used to tell the server to record a session. Use the \fICURLOPT_RANGE\fP
|
|
option to modify the record time. (Added in 7.20.0)
|
|
.IP CURL_RTSPREQ_RECEIVE
|
|
This is a special request because it does not send any data to the server. The
|
|
application may call this function in order to receive interleaved RTP
|
|
data. It will return after processing one read buffer of data in order to give
|
|
the application a chance to run. (Added in 7.20.0)
|
|
.RE
|
|
.IP CURLOPT_RTSP_SESSION_ID
|
|
Pass a char * as a parameter to set the value of the current RTSP Session ID
|
|
for the handle. Useful for resuming an in-progress session. Once this value is
|
|
set to any non-NULL value, libcurl will return \fICURLE_RTSP_SESSION_ERROR\fP
|
|
if ID received from the server does not match. If unset (or set to NULL),
|
|
libcurl will automatically set the ID the first time the server sets it in a
|
|
response. (Added in 7.20.0)
|
|
.IP CURLOPT_RTSP_STREAM_URI
|
|
Set the stream URI to operate on by passing a char * . For example, a single
|
|
session may be controlling \fIrtsp://foo/twister/audio\fP and
|
|
\fIrtsp://foo/twister/video\fP and the application can switch to the
|
|
appropriate stream using this option. If unset, libcurl will default to
|
|
operating on generic server options by passing '*' in the place of the RTSP
|
|
Stream URI. This option is distinct from \fICURLOPT_URL\fP. When working with
|
|
RTSP, the \fICURLOPT_STREAM_URI\fP indicates what URL to send to the server in
|
|
the request header while the \fICURLOPT_URL\fP indicates where to make the
|
|
connection to. (e.g. the \fICURLOPT_URL\fP for the above examples might be
|
|
set to \fIrtsp://foo/twister\fP (Added in 7.20.0)
|
|
.IP CURLOPT_RTSP_TRANSPORT
|
|
Pass a char * to tell libcurl what to pass for the Transport: header for this
|
|
RTSP session. This is mainly a convenience method to avoid needing to set a
|
|
custom Transport: header for every SETUP request. The application must set a
|
|
Transport: header before issuing a SETUP request. (Added in 7.20.0)
|
|
.IP CURLOPT_RTSP_HEADER
|
|
This option is simply an alias for \fICURLOPT_HTTP_HEADER\fP. Use this to
|
|
replace the standard headers that RTSP and HTTP share. It is also valid to use
|
|
the shortcuts such as \fICURLOPT_USERAGENT\fP. (Added in 7.20.0)
|
|
.IP CURLOPT_RTSP_CLIENT_CSEQ
|
|
Manually set the the CSEQ number to issue for the next RTSP request. Useful if
|
|
the application is resuming a previously broken connection. The CSEQ will
|
|
increment from this new number henceforth. (Added in 7.20.0)
|
|
.IP CURLOPT_RTSP_SERVER_CSEQ
|
|
Manually set the CSEQ number to expect for the next RTSP Server->Client
|
|
request. At the moment, this feature (listening for Server requests) is
|
|
unimplemented. (Added in 7.20.0)
|
|
.SH PROTOCOL OPTIONS
|
|
.IP CURLOPT_TRANSFERTEXT
|
|
A parameter set to 1 tells the library to use ASCII mode for FTP transfers,
|
|
instead of the default binary transfer. For win32 systems it does not set the
|
|
stdout to binary mode. This option can be usable when transferring text data
|
|
between systems with different views on certain characters, such as newlines
|
|
or similar.
|
|
|
|
libcurl does not do a complete ASCII conversion when doing ASCII transfers
|
|
over FTP. This is a known limitation/flaw that nobody has rectified. libcurl
|
|
simply sets the mode to ASCII and performs a standard transfer.
|
|
.IP CURLOPT_PROXY_TRANSFER_MODE
|
|
Pass a long. If the value is set to 1 (one), it tells libcurl to set the
|
|
transfer mode (binary or ASCII) for FTP transfers done via a HTTP proxy, by
|
|
appending ;type=a or ;type=i to the URL. Without this setting, or it being set
|
|
to 0 (zero, the default), \fICURLOPT_TRANSFERTEXT\fP has no effect when doing
|
|
FTP via a proxy. Beware that not all proxies support this feature. (Added in
|
|
7.18.0)
|
|
.IP CURLOPT_CRLF
|
|
Pass a long. If the value is set to 1 (one), libcurl converts Unix newlines to
|
|
CRLF newlines on transfers. Disable this option again by setting the value to
|
|
0 (zero).
|
|
.IP CURLOPT_RANGE
|
|
Pass a char * as parameter, which should contain the specified range you
|
|
want. It should be in the format "X-Y", where X or Y may be left out. HTTP
|
|
transfers also support several intervals, separated with commas as in
|
|
\fI"X-Y,N-M"\fP. Using this kind of multiple intervals will cause the HTTP
|
|
server to send the response document in pieces (using standard MIME separation
|
|
techniques). For RTSP, the formatting of a range should follow RFC2326
|
|
Section 12.29. For RTSP, byte ranges are \fBnot\fP permitted. Instead, ranges
|
|
should be given in npt, utc, or smpte formats.
|
|
|
|
Pass a NULL to this option to disable the use of ranges.
|
|
|
|
Ranges work on HTTP, FTP, FILE (since 7.18.0), and RTSP (since 7.20.0)
|
|
transfers only.
|
|
.IP CURLOPT_RESUME_FROM
|
|
Pass a long as parameter. It contains the offset in number of bytes that you
|
|
want the transfer to start from. Set this option to 0 to make the transfer
|
|
start from the beginning (effectively disabling resume). For FTP, set this
|
|
option to -1 to make the transfer start from the end of the target file
|
|
(useful to continue an interrupted upload).
|
|
|
|
When doing uploads with FTP, the resume position is where in the local/source
|
|
file libcurl should try to resume the upload from and it will then append the
|
|
source file to the remote target file.
|
|
.IP CURLOPT_RESUME_FROM_LARGE
|
|
Pass a curl_off_t as parameter. It contains the offset in number of bytes that
|
|
you want the transfer to start from. (Added in 7.11.0)
|
|
.IP CURLOPT_CUSTOMREQUEST
|
|
Pass a pointer to a zero terminated string as parameter. It can be used to
|
|
specify the request instead of GET or HEAD when performing HTTP based
|
|
requests, instead of LIST and NLST when performing FTP directory listings and
|
|
instead of LIST and RETR when issuing POP3 based commands. This is
|
|
particularly useful, for example, for performing a HTTP DELETE request or a
|
|
POP3 DELE command.
|
|
|
|
Please don't perform this at will, on HTTP based requests, by making sure
|
|
your server supports the command you are sending first.
|
|
|
|
When you change the request method by setting \fBCURLOPT_CUSTOMREQUEST\fP to
|
|
something, you don't actually change how libcurl behaves or acts in regards
|
|
to the particular request method, it will only change the actual string sent
|
|
in the request.
|
|
|
|
For example:
|
|
|
|
With the HTTP protocol when you tell libcurl to do a HEAD request, but then
|
|
specify a GET though a custom request libcurl will still act as if it sent a
|
|
HEAD. To switch to a proper HEAD use \fICURLOPT_NOBODY\fP, to switch to a
|
|
proper POST use \fICURLOPT_POST\fP or \fICURLOPT_POSTFIELDS\fP and to switch
|
|
to a proper GET use CURLOPT_HTTPGET.
|
|
|
|
With the POP3 protocol when you tell libcurl to use a custom request it will
|
|
behave like a LIST or RETR command was sent where it expects data to be
|
|
returned by the server. As such \fICURLOPT_NOBODY\fP should be used when
|
|
specifying commands such as DELE and NOOP for example.
|
|
|
|
Restore to the internal default by setting this to NULL.
|
|
|
|
Many people have wrongly used this option to replace the entire request with
|
|
their own, including multiple headers and POST contents. While that might
|
|
work in many cases, it will cause libcurl to send invalid requests and it
|
|
could possibly confuse the remote server badly. Use \fICURLOPT_POST\fP and
|
|
\fICURLOPT_POSTFIELDS\fP to set POST data. Use \fICURLOPT_HTTPHEADER\fP to
|
|
replace or extend the set of headers sent by libcurl. Use
|
|
\fICURLOPT_HTTP_VERSION\fP to change HTTP version.
|
|
|
|
(Support for POP3 added in 7.26.0)
|
|
.IP CURLOPT_FILETIME
|
|
Pass a long. If it is 1, libcurl will attempt to get the modification date of
|
|
the remote document in this operation. This requires that the remote server
|
|
sends the time or replies to a time querying command. The
|
|
\fIcurl_easy_getinfo(3)\fP function with the \fICURLINFO_FILETIME\fP argument
|
|
can be used after a transfer to extract the received time (if any).
|
|
.IP CURLOPT_NOBODY
|
|
A parameter set to 1 tells the library to not include the body-part in the
|
|
output. This is only relevant for protocols that have separate header and
|
|
body parts. On HTTP(S) servers, this will make libcurl do a HEAD request.
|
|
|
|
To change request to GET, you should use \fICURLOPT_HTTPGET\fP. Change
|
|
request to POST with \fICURLOPT_POST\fP etc.
|
|
.IP CURLOPT_INFILESIZE
|
|
When uploading a file to a remote site, this option should be used to tell
|
|
libcurl what the expected size of the infile is. This value should be passed
|
|
as a long. See also \fICURLOPT_INFILESIZE_LARGE\fP.
|
|
|
|
For uploading using SCP, this option or \fICURLOPT_INFILESIZE_LARGE\fP is
|
|
mandatory.
|
|
|
|
When sending emails using SMTP, this command can be used to specify the
|
|
optional SIZE parameter for the MAIL FROM command. (Added in 7.23.0)
|
|
|
|
This option does not limit how much data libcurl will actually send, as that
|
|
is controlled entirely by what the read callback returns.
|
|
.IP CURLOPT_INFILESIZE_LARGE
|
|
When uploading a file to a remote site, this option should be used to tell
|
|
libcurl what the expected size of the infile is. This value should be passed
|
|
as a curl_off_t. (Added in 7.11.0)
|
|
|
|
For uploading using SCP, this option or \fICURLOPT_INFILESIZE\fP is mandatory.
|
|
|
|
This option does not limit how much data libcurl will actually send, as that
|
|
is controlled entirely by what the read callback returns.
|
|
.IP CURLOPT_UPLOAD
|
|
A parameter set to 1 tells the library to prepare for an upload. The
|
|
\fICURLOPT_READDATA\fP and \fICURLOPT_INFILESIZE\fP or
|
|
\fICURLOPT_INFILESIZE_LARGE\fP options are also interesting for uploads. If
|
|
the protocol is HTTP, uploading means using the PUT request unless you tell
|
|
libcurl otherwise.
|
|
|
|
Using PUT with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
|
|
You can disable this header with \fICURLOPT_HTTPHEADER\fP as usual.
|
|
|
|
If you use PUT to a HTTP 1.1 server, you can upload data without knowing the
|
|
size before starting the transfer if you use chunked encoding. You enable this
|
|
by adding a header like "Transfer-Encoding: chunked" with
|
|
\fICURLOPT_HTTPHEADER\fP. With HTTP 1.0 or without chunked transfer, you must
|
|
specify the size.
|
|
.IP CURLOPT_MAXFILESIZE
|
|
Pass a long as parameter. This allows you to specify the maximum size (in
|
|
bytes) of a file to download. If the file requested is larger than this value,
|
|
the transfer will not start and CURLE_FILESIZE_EXCEEDED will be returned.
|
|
|
|
The file size is not always known prior to download, and for such files this
|
|
option has no effect even if the file transfer ends up being larger than this
|
|
given limit. This concerns both FTP and HTTP transfers.
|
|
.IP CURLOPT_MAXFILESIZE_LARGE
|
|
Pass a curl_off_t as parameter. This allows you to specify the maximum size
|
|
(in bytes) of a file to download. If the file requested is larger than this
|
|
value, the transfer will not start and \fICURLE_FILESIZE_EXCEEDED\fP will be
|
|
returned. (Added in 7.11.0)
|
|
|
|
The file size is not always known prior to download, and for such files this
|
|
option has no effect even if the file transfer ends up being larger than this
|
|
given limit. This concerns both FTP and HTTP transfers.
|
|
.IP CURLOPT_TIMECONDITION
|
|
Pass a long as parameter. This defines how the \fICURLOPT_TIMEVALUE\fP time
|
|
value is treated. You can set this parameter to \fICURL_TIMECOND_IFMODSINCE\fP
|
|
or \fICURL_TIMECOND_IFUNMODSINCE\fP. This feature applies to HTTP, FTP, RTSP,
|
|
and FILE.
|
|
|
|
The last modification time of a file is not always known and in such instances
|
|
this feature will have no effect even if the given time condition would not
|
|
have been met. \fIcurl_easy_getinfo(3)\fP with the
|
|
\fICURLINFO_CONDITION_UNMET\fP option can be used after a transfer to learn if
|
|
a zero-byte successful "transfer" was due to this condition not matching.
|
|
.IP CURLOPT_TIMEVALUE
|
|
Pass a long as parameter. This should be the time in seconds since 1 Jan 1970,
|
|
and the time will be used in a condition as specified with
|
|
\fICURLOPT_TIMECONDITION\fP.
|
|
.SH CONNECTION OPTIONS
|
|
.IP CURLOPT_TIMEOUT
|
|
Pass a long as parameter containing the maximum time in seconds that you allow
|
|
the libcurl transfer operation to take. Normally, name lookups can take a
|
|
considerable time and limiting operations to less than a few minutes risk
|
|
aborting perfectly normal operations. This option will cause curl to use the
|
|
SIGALRM to enable time-outing system calls.
|
|
|
|
In unix-like systems, this might cause signals to be used unless
|
|
\fICURLOPT_NOSIGNAL\fP is set.
|
|
|
|
Default timeout is 0 (zero) which means it never times out.
|
|
.IP CURLOPT_TIMEOUT_MS
|
|
An alternative to \fICURLOPT_TIMEOUT\fP but takes number of milliseconds
|
|
instead. If libcurl is built to use the standard system name resolver, that
|
|
portion of the transfer will still use full-second resolution for timeouts
|
|
with a minimum timeout allowed of one second.
|
|
|
|
If both \fICURLOPT_TIMEOUT\fP and \fICURLOPT_TIMEOUT_MS\fP are set, the value
|
|
set last will be used.
|
|
|
|
(Added in 7.16.2)
|
|
.IP CURLOPT_LOW_SPEED_LIMIT
|
|
Pass a long as parameter. It contains the transfer speed in bytes per second
|
|
that the transfer should be below during \fICURLOPT_LOW_SPEED_TIME\fP seconds
|
|
for the library to consider it too slow and abort.
|
|
.IP CURLOPT_LOW_SPEED_TIME
|
|
Pass a long as parameter. It contains the time in seconds that the transfer
|
|
should be below the \fICURLOPT_LOW_SPEED_LIMIT\fP for the library to consider
|
|
it too slow and abort.
|
|
.IP CURLOPT_MAX_SEND_SPEED_LARGE
|
|
Pass a curl_off_t as parameter. If an upload exceeds this speed (counted in
|
|
bytes per second) on cumulative average during the transfer, the transfer will
|
|
pause to keep the average rate less than or equal to the parameter value.
|
|
Defaults to unlimited speed. (Added in 7.15.5)
|
|
.IP CURLOPT_MAX_RECV_SPEED_LARGE
|
|
Pass a curl_off_t as parameter. If a download exceeds this speed (counted in
|
|
bytes per second) on cumulative average during the transfer, the transfer will
|
|
pause to keep the average rate less than or equal to the parameter
|
|
value. Defaults to unlimited speed. (Added in 7.15.5)
|
|
.IP CURLOPT_MAXCONNECTS
|
|
Pass a long. The set number will be the persistent connection cache size. The
|
|
set amount will be the maximum amount of simultaneously open connections that
|
|
libcurl may cache in this easy handle. Default is 5, and there isn't much
|
|
point in changing this value unless you are perfectly aware of how this works
|
|
and changes libcurl's behaviour. This concerns connections using any of the
|
|
protocols that support persistent connections.
|
|
|
|
When reaching the maximum limit, curl closes the oldest one in the cache to
|
|
prevent increasing the number of open connections.
|
|
|
|
If you already have performed transfers with this curl handle, setting a
|
|
smaller MAXCONNECTS than before may cause open connections to get closed
|
|
unnecessarily.
|
|
|
|
If you add this easy handle to a multi handle, this setting is not
|
|
acknowledged, and you must instead use \fIcurl_multi_setopt(3)\fP and the
|
|
\fICURLMOPT_MAXCONNECTS\fP option.
|
|
.IP CURLOPT_CLOSEPOLICY
|
|
(Obsolete) This option does nothing.
|
|
.IP CURLOPT_FRESH_CONNECT
|
|
Pass a long. Set to 1 to make the next transfer use a new (fresh) connection
|
|
by force. If the connection cache is full before this connection, one of the
|
|
existing connections will be closed as according to the selected or default
|
|
policy. This option should be used with caution and only if you understand
|
|
what it does. Set this to 0 to have libcurl attempt re-using an existing
|
|
connection (default behavior).
|
|
.IP CURLOPT_FORBID_REUSE
|
|
Pass a long. Set to 1 to make the next transfer explicitly close the
|
|
connection when done. Normally, libcurl keeps all connections alive when done
|
|
with one transfer in case a succeeding one follows that can re-use them.
|
|
This option should be used with caution and only if you understand what it
|
|
does. Set to 0 to have libcurl keep the connection open for possible later
|
|
re-use (default behavior).
|
|
.IP CURLOPT_CONNECTTIMEOUT
|
|
Pass a long. It should contain the maximum time in seconds that you allow the
|
|
connection to the server to take. This only limits the connection phase, once
|
|
it has connected, this option is of no more use. Set to zero to switch to the
|
|
default built-in connection timeout - 300 seconds. See also the
|
|
\fICURLOPT_TIMEOUT\fP option.
|
|
|
|
In unix-like systems, this might cause signals to be used unless
|
|
\fICURLOPT_NOSIGNAL\fP is set.
|
|
.IP CURLOPT_CONNECTTIMEOUT_MS
|
|
Like \fICURLOPT_CONNECTTIMEOUT\fP but takes the number of milliseconds
|
|
instead. If libcurl is built to use the standard system name resolver,
|
|
that portion of the connect will still use full-second resolution for
|
|
timeouts with a minimum timeout allowed of one second.
|
|
(Added in 7.16.2)
|
|
.IP CURLOPT_IPRESOLVE
|
|
Allows an application to select what kind of IP addresses to use when
|
|
resolving host names. This is only interesting when using host names that
|
|
resolve addresses using more than one version of IP. The allowed values are:
|
|
.RS
|
|
.IP CURL_IPRESOLVE_WHATEVER
|
|
Default, resolves addresses to all IP versions that your system allows.
|
|
.IP CURL_IPRESOLVE_V4
|
|
Resolve to IPv4 addresses.
|
|
.IP CURL_IPRESOLVE_V6
|
|
Resolve to IPv6 addresses.
|
|
.RE
|
|
.IP CURLOPT_CONNECT_ONLY
|
|
Pass a long. If the parameter equals 1, it tells the library to perform all
|
|
the required proxy authentication and connection setup, but no data transfer.
|
|
This option is implemented for HTTP, SMTP and POP3.
|
|
|
|
The option can be used to simply test a connection to a server, but is more
|
|
useful when used with the \fICURLINFO_LASTSOCKET\fP option to
|
|
\fIcurl_easy_getinfo(3)\fP as the library can set up the connection and then
|
|
the application can obtain the most recently used socket for special data
|
|
transfers. (Added in 7.15.2)
|
|
.IP CURLOPT_USE_SSL
|
|
Pass a long using one of the values from below, to make libcurl use your
|
|
desired level of SSL for the transfer. (Added in 7.11.0)
|
|
|
|
This is for enabling SSL/TLS when you use FTP, SMTP, POP3, IMAP etc.
|
|
|
|
(This option was known as CURLOPT_FTP_SSL up to 7.16.4, and the constants
|
|
were known as CURLFTPSSL_*)
|
|
.RS
|
|
.IP CURLUSESSL_NONE
|
|
Don't attempt to use SSL.
|
|
.IP CURLUSESSL_TRY
|
|
Try using SSL, proceed as normal otherwise.
|
|
.IP CURLUSESSL_CONTROL
|
|
Require SSL for the control connection or fail with \fICURLE_USE_SSL_FAILED\fP.
|
|
.IP CURLUSESSL_ALL
|
|
Require SSL for all communication or fail with \fICURLE_USE_SSL_FAILED\fP.
|
|
.RE
|
|
.IP CURLOPT_RESOLVE
|
|
Pass a pointer to a linked list of strings with host name resolve information
|
|
to use for requests with this handle. The linked list should be a fully valid
|
|
list of \fBstruct curl_slist\fP structs properly filled in. Use
|
|
\fIcurl_slist_append(3)\fP to create the list and \fIcurl_slist_free_all(3)\fP
|
|
to clean up an entire list.
|
|
|
|
Each single name resolve string should be written using the format
|
|
HOST:PORT:ADDRESS where HOST is the name libcurl will try to resolve, PORT is
|
|
the port number of the service where libcurl wants to connect to the HOST and
|
|
ADDRESS is the numerical IP address. If libcurl is built to support IPv6,
|
|
ADDRESS can of course be either IPv4 or IPv6 style addressing.
|
|
|
|
This option effectively pre-populates the DNS cache with entries for the
|
|
host+port pair so redirects and everything that operations against the
|
|
HOST+PORT will instead use your provided ADDRESS. Addresses to set with
|
|
\fICURL_RESOLVE\fP will not time-out from the DNS cache like ordindary
|
|
entries.
|
|
|
|
You can remove names from the DNS cache again, to stop providing these fake
|
|
resolves, by including a string in the linked list that uses the format
|
|
\&"-HOST:PORT". The host name must be prefixed with a dash, and the host name
|
|
and port number must exactly match what was already added previously.
|
|
|
|
(Added in 7.21.3)
|
|
.IP CURLOPT_DNS_SERVERS
|
|
Set the list of DNS servers to be used instead of the system default.
|
|
The format of the dns servers option is:
|
|
|
|
host[:port][,host[:port]]...
|
|
|
|
For example:
|
|
|
|
192.168.1.100,192.168.1.101,3.4.5.6
|
|
|
|
This option requires that libcurl was built with a resolver backend that
|
|
supports this operation. The c-ares backend is the only such one.
|
|
|
|
(Added in 7.24.0)
|
|
.IP CURLOPT_DNS_INTERFACE
|
|
Pass a char * as parameter. Set the name of the network interface that
|
|
the DNS resolver should bind to. This must be an interface name (not an
|
|
address). Set this option to NULL to use the default setting (don't
|
|
bind to a specific interface).
|
|
|
|
This option requires that libcurl was built with a resolver backend that
|
|
supports this operation. The c-ares backend is the only such one.
|
|
|
|
(Added in 7.33.0)
|
|
.IP CURLOPT_DNS_LOCAL_IP4
|
|
Set the local IPv4 address that the resolver should bind to. The argument
|
|
should be of type char * and contain a single IPv4 address as a string.
|
|
Set this option to NULL to use the default setting (don't
|
|
bind to a specific IP address).
|
|
|
|
This option requires that libcurl was built with a resolver backend that
|
|
supports this operation. The c-ares backend is the only such one.
|
|
|
|
(Added in 7.33.0)
|
|
.IP CURLOPT_DNS_LOCAL_IP6
|
|
Set the local IPv6 address that the resolver should bind to. The argument
|
|
should be of type char * and contain a single IPv6 address as a string.
|
|
Set this option to NULL to use the default setting (don't
|
|
bind to a specific IP address).
|
|
|
|
This option requires that libcurl was built with a resolver backend that
|
|
supports this operation. The c-ares backend is the only such one.
|
|
|
|
(Added in 7.33.0)
|
|
.IP CURLOPT_ACCEPTTIMEOUT_MS
|
|
Pass a long telling libcurl the maximum number of milliseconds to wait for a
|
|
server to connect back to libcurl when an active FTP connection is used. If no
|
|
timeout is set, the internal default of 60000 will be used. (Added in 7.24.0)
|
|
.SH SSL and SECURITY OPTIONS
|
|
.IP CURLOPT_SSLCERT
|
|
Pass a pointer to a zero terminated string as parameter. The string should be
|
|
the file name of your certificate. The default format is "P12" on Secure
|
|
Transport and "PEM" on other engines, and can be changed with
|
|
\fICURLOPT_SSLCERTTYPE\fP.
|
|
|
|
With NSS or Secure Transport, this can also be the nickname of the certificate
|
|
you wish to authenticate with as it is named in the security database. If you
|
|
want to use a file from the current directory, please precede it with "./"
|
|
prefix, in order to avoid confusion with a nickname.
|
|
.IP CURLOPT_SSLCERTTYPE
|
|
Pass a pointer to a zero terminated string as parameter. The string should be
|
|
the format of your certificate. Supported formats are "PEM" and "DER", except
|
|
with Secure Transport. OpenSSL (versions 0.9.3 and later) and Secure Transport
|
|
(on iOS 5 or later, or OS X 10.7 or later) also support "P12" for
|
|
PKCS#12-encoded files. (Added in 7.9.3)
|
|
.IP CURLOPT_SSLKEY
|
|
Pass a pointer to a zero terminated string as parameter. The string should be
|
|
the file name of your private key. The default format is "PEM" and can be
|
|
changed with \fICURLOPT_SSLKEYTYPE\fP.
|
|
|
|
(iOS and Mac OS X only) This option is ignored if curl was built against Secure
|
|
Transport. Secure Transport expects the private key to be already present in
|
|
the keychain or PKCS#12 file containing the certificate.
|
|
.IP CURLOPT_SSLKEYTYPE
|
|
Pass a pointer to a zero terminated string as parameter. The string should be
|
|
the format of your private key. Supported formats are "PEM", "DER" and "ENG".
|
|
|
|
The format "ENG" enables you to load the private key from a crypto engine. In
|
|
this case \fICURLOPT_SSLKEY\fP is used as an identifier passed to the
|
|
engine. You have to set the crypto engine with \fICURLOPT_SSLENGINE\fP.
|
|
\&"DER" format key file currently does not work because of a bug in OpenSSL.
|
|
.IP CURLOPT_KEYPASSWD
|
|
Pass a pointer to a zero terminated string as parameter. It will be used as
|
|
the password required to use the \fICURLOPT_SSLKEY\fP or
|
|
\fICURLOPT_SSH_PRIVATE_KEYFILE\fP private key.
|
|
You never needed a pass phrase to load a certificate but you need one to
|
|
load your private key.
|
|
|
|
(This option was known as CURLOPT_SSLKEYPASSWD up to 7.16.4 and
|
|
CURLOPT_SSLCERTPASSWD up to 7.9.2)
|
|
.IP CURLOPT_SSLENGINE
|
|
Pass a pointer to a zero terminated string as parameter. It will be used as
|
|
the identifier for the crypto engine you want to use for your private
|
|
key.
|
|
|
|
If the crypto device cannot be loaded, \fICURLE_SSL_ENGINE_NOTFOUND\fP is
|
|
returned.
|
|
.IP CURLOPT_SSLENGINE_DEFAULT
|
|
Sets the actual crypto engine as the default for (asymmetric) crypto
|
|
operations.
|
|
|
|
If the crypto device cannot be set, \fICURLE_SSL_ENGINE_SETFAILED\fP is
|
|
returned.
|
|
|
|
Even though this option doesn't need any parameter, in some configurations
|
|
\fIcurl_easy_setopt\fP might be defined as a macro taking exactly three
|
|
arguments. Therefore, it's recommended to pass 1 as parameter to this option.
|
|
.IP CURLOPT_SSLVERSION
|
|
Pass a long as parameter to control what version of SSL/TLS to attempt to use.
|
|
(Added in 7.9.2)
|
|
|
|
The available options are:
|
|
.RS
|
|
.IP CURL_SSLVERSION_DEFAULT
|
|
The default action. This will attempt to figure out the remote SSL protocol
|
|
version, i.e. either SSLv3 or TLSv1 (but not SSLv2, which became disabled
|
|
by default with 7.18.1).
|
|
.IP CURL_SSLVERSION_TLSv1
|
|
Force TLSv1.x
|
|
.IP CURL_SSLVERSION_SSLv2
|
|
Force SSLv2
|
|
.IP CURL_SSLVERSION_SSLv3
|
|
Force SSLv3
|
|
.IP CURL_SSLVERSION_TLSv1_0
|
|
Force TLSv1.0 (Added in 7.34.0)
|
|
.IP CURL_SSLVERSION_TLSv1_1
|
|
Force TLSv1.1 (Added in 7.34.0)
|
|
.IP CURL_SSLVERSION_TLSv1_2
|
|
Force TLSv1.2 (Added in 7.34.0)
|
|
.RE
|
|
.IP CURLOPT_SSL_VERIFYPEER
|
|
Pass a long as parameter. By default, curl assumes a value of 1.
|
|
|
|
This option determines whether curl verifies the authenticity of the peer's
|
|
certificate. A value of 1 means curl verifies; 0 (zero) means it doesn't.
|
|
|
|
When negotiating a SSL connection, the server sends a certificate indicating
|
|
its identity. Curl verifies whether the certificate is authentic, i.e. that
|
|
you can trust that the server is who the certificate says it is. This trust
|
|
is based on a chain of digital signatures, rooted in certification authority
|
|
(CA) certificates you supply. curl uses a default bundle of CA certificates
|
|
(the path for that is determined at build time) and you can specify alternate
|
|
certificates with the \fICURLOPT_CAINFO\fP option or the \fICURLOPT_CAPATH\fP
|
|
option.
|
|
|
|
When \fICURLOPT_SSL_VERIFYPEER\fP is nonzero, and the verification fails to
|
|
prove that the certificate is authentic, the connection fails. When the
|
|
option is zero, the peer certificate verification succeeds regardless.
|
|
|
|
Authenticating the certificate is not by itself very useful. You typically
|
|
want to ensure that the server, as authentically identified by its
|
|
certificate, is the server you mean to be talking to. Use
|
|
\fICURLOPT_SSL_VERIFYHOST\fP to control that. The check that the host name in
|
|
the certificate is valid for the host name you're connecting to is done
|
|
independently of the \fICURLOPT_SSL_VERIFYPEER\fP option.
|
|
.IP CURLOPT_CAINFO
|
|
Pass a char * to a zero terminated string naming a file holding one or more
|
|
certificates to verify the peer with. This makes sense only when used in
|
|
combination with the \fICURLOPT_SSL_VERIFYPEER\fP option. If
|
|
\fICURLOPT_SSL_VERIFYPEER\fP is zero, \fICURLOPT_CAINFO\fP need not
|
|
even indicate an accessible file.
|
|
|
|
This option is by default set to the system path where libcurl's cacert bundle
|
|
is assumed to be stored, as established at build time.
|
|
|
|
If curl is built against the NSS SSL library, the NSS PEM PKCS#11 module
|
|
(libnsspem.so) needs to be available for this option to work properly.
|
|
.IP CURLOPT_ISSUERCERT
|
|
Pass a char * to a zero terminated string naming a file holding a CA
|
|
certificate in PEM format. If the option is set, an additional check against
|
|
the peer certificate is performed to verify the issuer is indeed the one
|
|
associated with the certificate provided by the option. This additional check
|
|
is useful in multi-level PKI where one needs to enforce that the peer
|
|
certificate is from a specific branch of the tree.
|
|
|
|
This option makes sense only when used in combination with the
|
|
\fICURLOPT_SSL_VERIFYPEER\fP option. Otherwise, the result of the check is not
|
|
considered as failure.
|
|
|
|
A specific error code (CURLE_SSL_ISSUER_ERROR) is defined with the option,
|
|
which is returned if the setup of the SSL/TLS session has failed due to a
|
|
mismatch with the issuer of peer certificate (\fICURLOPT_SSL_VERIFYPEER\fP has
|
|
to be set too for the check to fail). (Added in 7.19.0)
|
|
.IP CURLOPT_CAPATH
|
|
Pass a char * to a zero terminated string naming a directory holding multiple
|
|
CA certificates to verify the peer with. If libcurl is built against OpenSSL,
|
|
the certificate directory must be prepared using the openssl c_rehash utility.
|
|
This makes sense only when used in combination with the
|
|
\fICURLOPT_SSL_VERIFYPEER\fP option. If \fICURLOPT_SSL_VERIFYPEER\fP is zero,
|
|
\fICURLOPT_CAPATH\fP need not even indicate an accessible path. The
|
|
\fICURLOPT_CAPATH\fP function apparently does not work in Windows due to some
|
|
limitation in openssl. This option is OpenSSL-specific and does nothing if
|
|
libcurl is built to use GnuTLS. NSS-powered libcurl provides the option only
|
|
for backward compatibility.
|
|
.IP CURLOPT_CRLFILE
|
|
Pass a char * to a zero terminated string naming a file with the concatenation
|
|
of CRL (in PEM format) to use in the certificate validation that occurs during
|
|
the SSL exchange.
|
|
|
|
When curl is built to use NSS or GnuTLS, there is no way to influence the use
|
|
of CRL passed to help in the verification process. When libcurl is built with
|
|
OpenSSL support, X509_V_FLAG_CRL_CHECK and X509_V_FLAG_CRL_CHECK_ALL are both
|
|
set, requiring CRL check against all the elements of the certificate chain if
|
|
a CRL file is passed.
|
|
|
|
This option makes sense only when used in combination with the
|
|
\fICURLOPT_SSL_VERIFYPEER\fP option.
|
|
|
|
A specific error code (CURLE_SSL_CRL_BADFILE) is defined with the option. It
|
|
is returned when the SSL exchange fails because the CRL file cannot be loaded.
|
|
A failure in certificate verification due to a revocation information found in
|
|
the CRL does not trigger this specific error. (Added in 7.19.0)
|
|
.IP CURLOPT_SSL_VERIFYHOST
|
|
Pass a long as parameter.
|
|
|
|
This option determines whether libcurl verifies that the server cert is for
|
|
the server it is known as.
|
|
|
|
When negotiating a SSL connection, the server sends a certificate indicating
|
|
its identity.
|
|
|
|
When \fICURLOPT_SSL_VERIFYHOST\fP is 2, that certificate must indicate that
|
|
the server is the server to which you meant to connect, or the connection
|
|
fails.
|
|
|
|
Curl considers the server the intended one when the Common Name field or a
|
|
Subject Alternate Name field in the certificate matches the host name in the
|
|
URL to which you told Curl to connect.
|
|
|
|
When the value is 1, \fIcurl_easy_setopt\fP will return an error and the option
|
|
value will not be changed. It was previously (in 7.28.0 and earlier) a debug
|
|
option of some sorts, but it is no longer supported due to frequently leading
|
|
to programmer mistakes.
|
|
|
|
When the value is 0, the connection succeeds regardless of the names in the
|
|
certificate.
|
|
|
|
The default value for this option is 2.
|
|
|
|
This option controls checking the server's certificate's claimed identity.
|
|
The server could be lying. To control lying, see
|
|
\fICURLOPT_SSL_VERIFYPEER\fP. If libcurl is built against NSS and
|
|
\fICURLOPT_SSL_VERIFYPEER\fP is zero, \fICURLOPT_SSL_VERIFYHOST\fP is also set
|
|
to zero and cannot be overridden.
|
|
.IP CURLOPT_CERTINFO
|
|
Pass a long set to 1 to enable libcurl's certificate chain info gatherer. With
|
|
this enabled, libcurl (if built with OpenSSL, NSS, GSKit or QsoSSL) will
|
|
extract lots of information
|
|
and data about the certificates in the certificate chain used in the SSL
|
|
connection. This data may then be retrieved after a transfer using
|
|
\fIcurl_easy_getinfo(3)\fP and its option \fICURLINFO_CERTINFO\fP. (Added in
|
|
7.19.1)
|
|
.IP CURLOPT_RANDOM_FILE
|
|
Pass a char * to a zero terminated file name. The file will be used to read
|
|
from to seed the random engine for SSL. The more random the specified file is,
|
|
the more secure the SSL connection will become.
|
|
.IP CURLOPT_EGDSOCKET
|
|
Pass a char * to the zero terminated path name to the Entropy Gathering Daemon
|
|
socket. It will be used to seed the random engine for SSL.
|
|
.IP CURLOPT_SSL_CIPHER_LIST
|
|
Pass a char *, pointing to a zero terminated string holding the list of
|
|
ciphers to use for the SSL connection. The list must be syntactically correct,
|
|
it consists of one or more cipher strings separated by colons. Commas or
|
|
spaces are also acceptable separators but colons are normally used, \&!, \&-
|
|
and \&+ can be used as operators.
|
|
|
|
For OpenSSL and GnuTLS valid examples of cipher lists include 'RC4-SHA',
|
|
\'SHA1+DES\', 'TLSv1' and 'DEFAULT'. The default list is normally set when you
|
|
compile OpenSSL.
|
|
|
|
You'll find more details about cipher lists on this URL:
|
|
\fIhttp://www.openssl.org/docs/apps/ciphers.html\fP
|
|
|
|
For NSS, valid examples of cipher lists include 'rsa_rc4_128_md5',
|
|
\'rsa_aes_128_sha\', etc. With NSS you don't add/remove ciphers. If one uses
|
|
this option then all known ciphers are disabled and only those passed in
|
|
are enabled.
|
|
|
|
You'll find more details about the NSS cipher lists on this URL:
|
|
\fIhttp://git.fedorahosted.org/cgit/mod_nss.git/plain/docs/mod_nss.html#Directives\fP
|
|
|
|
.IP CURLOPT_SSL_SESSIONID_CACHE
|
|
Pass a long set to 0 to disable libcurl's use of SSL session-ID caching. Set
|
|
this to 1 to enable it. By default all transfers are done using the
|
|
cache. While nothing ever should get hurt by attempting to reuse SSL
|
|
session-IDs, there seem to be broken SSL implementations in the wild that may
|
|
require you to disable this in order for you to succeed. (Added in 7.16.0)
|
|
.IP CURLOPT_SSL_OPTIONS
|
|
Pass a long with a bitmask to tell libcurl about specific SSL behaviors.
|
|
|
|
CURLSSLOPT_ALLOW_BEAST is the only supported bit and by setting this the user
|
|
will tell libcurl to not attempt to use any workarounds for a security flaw
|
|
in the SSL3 and TLS1.0 protocols. If this option isn't used or this bit is
|
|
set to 0, the SSL layer libcurl uses may use a work-around for this flaw
|
|
although it might cause interoperability problems with some (older) SSL
|
|
implementations. WARNING: avoiding this work-around loosens the security, and
|
|
by setting this option to 1 you ask for exactly that. (Added in 7.25.0)
|
|
.IP CURLOPT_KRBLEVEL
|
|
Pass a char * as parameter. Set the kerberos security level for FTP; this also
|
|
enables kerberos awareness. This is a string, \&'clear', \&'safe',
|
|
\&'confidential' or \&'private'. If the string is set but doesn't match one
|
|
of these, 'private' will be used. Set the string to NULL to disable kerberos
|
|
support for FTP.
|
|
|
|
(This option was known as CURLOPT_KRB4LEVEL up to 7.16.3)
|
|
.IP CURLOPT_GSSAPI_DELEGATION
|
|
Set the parameter to CURLGSSAPI_DELEGATION_FLAG to allow unconditional GSSAPI
|
|
credential delegation. The delegation is disabled by default since 7.21.7.
|
|
Set the parameter to CURLGSSAPI_DELEGATION_POLICY_FLAG to delegate only if
|
|
the OK-AS-DELEGATE flag is set in the service ticket in case this feature is
|
|
supported by the GSSAPI implementation and the definition of
|
|
GSS_C_DELEG_POLICY_FLAG was available at compile-time.
|
|
(Added in 7.22.0)
|
|
.SH SSH OPTIONS
|
|
.IP CURLOPT_SSH_AUTH_TYPES
|
|
Pass a long set to a bitmask consisting of one or more of
|
|
CURLSSH_AUTH_PUBLICKEY, CURLSSH_AUTH_PASSWORD, CURLSSH_AUTH_HOST,
|
|
CURLSSH_AUTH_KEYBOARD and CURLSSH_AUTH_AGENT. Set CURLSSH_AUTH_ANY to let
|
|
libcurl pick a suitable one. Currently CURLSSH_AUTH_HOST has no effect. (Added
|
|
in 7.16.1) If CURLSSH_AUTH_AGENT is used, libcurl attempts to connect to
|
|
ssh-agent or pageant and let the agent attempt the authentication. (Added in
|
|
7.28.0)
|
|
.IP CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
|
|
Pass a char * pointing to a string containing 32 hexadecimal digits. The
|
|
string should be the 128 bit MD5 checksum of the remote host's public key, and
|
|
libcurl will reject the connection to the host unless the md5sums match. This
|
|
option is only for SCP and SFTP transfers. (Added in 7.17.1)
|
|
.IP CURLOPT_SSH_PUBLIC_KEYFILE
|
|
Pass a char * pointing to a file name for your public key. If not used,
|
|
libcurl defaults to \fB$HOME/.ssh/id_dsa.pub\fP if the HOME environment
|
|
variable is set, and just "id_dsa.pub" in the current directory if HOME is not
|
|
set. (Added in 7.16.1)
|
|
If an empty string is passed, libcurl will pass no public key to libssh2
|
|
which then tries to compute it from the private key, this is known to work
|
|
when libssh2 1.4.0+ is linked against OpenSSL. (Added in 7.26.0)
|
|
.IP CURLOPT_SSH_PRIVATE_KEYFILE
|
|
Pass a char * pointing to a file name for your private key. If not used,
|
|
libcurl defaults to \fB$HOME/.ssh/id_dsa\fP if the HOME environment variable
|
|
is set, and just "id_dsa" in the current directory if HOME is not set. If the
|
|
file is password-protected, set the password with
|
|
\fICURLOPT_KEYPASSWD\fP. (Added in 7.16.1)
|
|
.IP CURLOPT_SSH_KNOWNHOSTS
|
|
Pass a pointer to a zero terminated string holding the file name of the
|
|
known_host file to use. The known_hosts file should use the OpenSSH file
|
|
format as supported by libssh2. If this file is specified, libcurl will only
|
|
accept connections with hosts that are known and present in that file, with a
|
|
matching public key. Use \fICURLOPT_SSH_KEYFUNCTION\fP to alter the default
|
|
behavior on host and key (mis)matching. (Added in 7.19.6)
|
|
.IP CURLOPT_SSH_KEYFUNCTION
|
|
Pass a pointer to a curl_sshkeycallback function. It gets called when the
|
|
known_host matching has been done, to allow the application to act and decide
|
|
for libcurl how to proceed. The callback will only be called if
|
|
\fICURLOPT_SSH_KNOWNHOSTS\fP is also set.
|
|
|
|
The curl_sshkeycallback function gets passed the CURL handle, the key from the
|
|
known_hosts file, the key from the remote site, info from libcurl on the
|
|
matching status and a custom pointer (set with \fICURLOPT_SSH_KEYDATA\fP). It
|
|
MUST return one of the following return codes to tell libcurl how to act:
|
|
.RS
|
|
.IP CURLKHSTAT_FINE_ADD_TO_FILE
|
|
The host+key is accepted and libcurl will append it to the known_hosts file
|
|
before continuing with the connection. This will also add the host+key combo
|
|
to the known_host pool kept in memory if it wasn't already present there. The
|
|
adding of data to the file is done by completely replacing the file with a new
|
|
copy, so the permissions of the file must allow this.
|
|
.IP CURLKHSTAT_FINE
|
|
The host+key is accepted libcurl will continue with the connection. This will
|
|
also add the host+key combo to the known_host pool kept in memory if it wasn't
|
|
already present there.
|
|
.IP CURLKHSTAT_REJECT
|
|
The host+key is rejected. libcurl will deny the connection to continue and it
|
|
will be closed.
|
|
.IP CURLKHSTAT_DEFER
|
|
The host+key is rejected, but the SSH connection is asked to be kept alive.
|
|
This feature could be used when the app wants to somehow return back and act
|
|
on the host+key situation and then retry without needing the overhead of
|
|
setting it up from scratch again.
|
|
.RE
|
|
(Added in 7.19.6)
|
|
.IP CURLOPT_SSH_KEYDATA
|
|
Pass a void * as parameter. This pointer will be passed along verbatim to the
|
|
callback set with \fICURLOPT_SSH_KEYFUNCTION\fP. (Added in 7.19.6)
|
|
.SH OTHER OPTIONS
|
|
.IP CURLOPT_PRIVATE
|
|
Pass a void * as parameter, pointing to data that should be associated with
|
|
this curl handle. The pointer can subsequently be retrieved using
|
|
\fIcurl_easy_getinfo(3)\fP with the CURLINFO_PRIVATE option. libcurl itself
|
|
does nothing with this data. (Added in 7.10.3)
|
|
.IP CURLOPT_SHARE
|
|
Pass a share handle as a parameter. The share handle must have been created by
|
|
a previous call to \fIcurl_share_init(3)\fP. Setting this option, will make
|
|
this curl handle use the data from the shared handle instead of keeping the
|
|
data to itself. This enables several curl handles to share data. If the curl
|
|
handles are used simultaneously in multiple threads, you \fBMUST\fP use the
|
|
locking methods in the share handle. See \fIcurl_share_setopt(3)\fP for
|
|
details.
|
|
|
|
If you add a share that is set to share cookies, your easy handle will use
|
|
that cookie cache and get the cookie engine enabled. If you unshare an object
|
|
that was using cookies (or change to another object that doesn't share
|
|
cookies), the easy handle will get its cookie engine disabled.
|
|
|
|
Data that the share object is not set to share will be dealt with the usual
|
|
way, as if no share was used.
|
|
.IP CURLOPT_NEW_FILE_PERMS
|
|
Pass a long as a parameter, containing the value of the permissions that will
|
|
be assigned to newly created files on the remote server. The default value is
|
|
\fI0644\fP, but any valid value can be used. The only protocols that can use
|
|
this are \fIsftp://\fP, \fIscp://\fP, and \fIfile://\fP. (Added in 7.16.4)
|
|
.IP CURLOPT_NEW_DIRECTORY_PERMS
|
|
Pass a long as a parameter, containing the value of the permissions that will
|
|
be assigned to newly created directories on the remote server. The default
|
|
value is \fI0755\fP, but any valid value can be used. The only protocols that
|
|
can use this are \fIsftp://\fP, \fIscp://\fP, and \fIfile://\fP.
|
|
(Added in 7.16.4)
|
|
.SH TELNET OPTIONS
|
|
.IP CURLOPT_TELNETOPTIONS
|
|
Provide a pointer to a curl_slist with variables to pass to the telnet
|
|
negotiations. The variables should be in the format <option=value>. libcurl
|
|
supports the options 'TTYPE', 'XDISPLOC' and 'NEW_ENV'. See the TELNET
|
|
standard for details.
|
|
.SH RETURN VALUE
|
|
CURLE_OK (zero) means that the option was set properly, non-zero means an
|
|
error occurred as \fI<curl/curl.h>\fP defines. See the \fIlibcurl-errors(3)\fP
|
|
man page for the full list with descriptions.
|
|
|
|
If you try to set an option that libcurl doesn't know about, perhaps because
|
|
the library is too old to support it or the option was removed in a recent
|
|
version, this function will return \fICURLE_FAILED_INIT\fP.
|
|
.SH "SEE ALSO"
|
|
.BR curl_easy_init "(3), " curl_easy_cleanup "(3), " curl_easy_reset "(3)"
|