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mentioned in the current curl/curl.h header file (that aren't marked as obsolete) are present.
931 lines
49 KiB
Groff
931 lines
49 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 - 2004, 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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.\" * $Id$
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.\" **************************************************************************
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.\"
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.TH curl_easy_setopt 3 "27 Feb 2004" "libcurl 7.11.1" "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 long, a function pointer or an object
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pointer, all depending on what the specific option expects. Read this manual
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carefully as bad input values may cause libcurl to behave badly! You can only
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set one option in each function call. A typical application uses many
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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.
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\fBNOTE:\fP strings passed to libcurl as 'char *' arguments, will not be
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copied by the library. Instead you should keep them available until libcurl no
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longer needs them. Failing to do so will cause very odd behavior or even
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crashes. libcurl will need them until you call curl_easy_cleanup() or you set
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the same option again to use a different pointer.
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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 non-zero 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.
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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 non-zero parameter 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).
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.IP CURLOPT_NOPROGRESS
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A non-zero parameter tells the library to shut off the built-in progress meter
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completely.
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\fBNOTE:\fP future versions of libcurl is likely to not have any built-in
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progress meter at all.
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.IP CURLOPT_NOSIGNAL
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Pass a long. If it is non-zero, 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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(Added in 7.10)
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Consider building libcurl with ares support to enable asynchronous DNS
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lookups. It enables nice timeouts for name resolves without signals.
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.PP
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.SH CALLBACK OPTIONS
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.IP CURLOPT_WRITEFUNCTION
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Function pointer that should match the following prototype: \fBsize_t
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function( void *ptr, size_t size, size_t nmemb, void *stream);\fP This
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function gets called by libcurl as soon as there is data reveiced that needs
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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 and it will abort the
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transfer and return \fICURLE_WRITE_ERROR\fP.
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Set the \fIstream\fP argument with the \fICURLOPT_WRITEDATA\fP option.
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\fBNOTE:\fP you will be passed as much data as possible in all invokes, but
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you cannot possibly make any assumptions. It may be one byte, it may be
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thousands. The maximum amount of data that can be passed to the write callback
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is defined in the curl.h header file: CURL_MAX_WRITE_SIZE.
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.IP CURLOPT_WRITEDATA
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Data pointer to pass to the file write function. Note that if you specify the
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\fICURLOPT_WRITEFUNCTION\fP, this is the pointer you'll get as input. If you
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don't use a callback, you must pass a 'FILE *' as libcurl will pass this to
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fwrite() when writing data.
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\fBNOTE:\fP If you're using libcurl as a win32 DLL, you MUST 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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Function pointer that should match the following prototype: \fBsize_t
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function( void *ptr, size_t size, size_t nmemb, void *stream);\fP This
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function gets called by libcurl as soon as it needs to read data in order to
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send it to the peer. The data area pointed at by the pointer \fIptr\fP may be
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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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.IP CURLOPT_READDATA
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Data pointer to pass to the file read function. Note that if you specify the
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\fICURLOPT_READFUNCTION\fP, this is the pointer you'll get as input. If you
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don't specify a read callback, this must be a valid FILE *.
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\fBNOTE:\fP 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 is also known with 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_PROGRESSFUNCTION
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Function pointer that should match the \fIcurl_progress_callback\fP prototype
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found in \fI<curl/curl.h>\fP. This function gets called by libcurl instead of
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its internal equivalent with a frequent interval during data transfer.
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Unknown/unused argument values will be set to zero (like if you only download
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data, the upload size will remain 0). Returning a non-zero value from this
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callback will cause libcurl to abort the transfer and return
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\fICURLE_ABORTED_BY_CALLBACK\fP.
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Also note that \fICURLOPT_NOPROGRESS\fP must be set to FALSE to make this
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function actually get called.
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.IP CURLOPT_PROGRESSDATA
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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 progress callback set with \fICURLOPT_PROGRESSFUNCTION\fP.
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.IP CURLOPT_HEADERFUNCTION
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Function pointer that should match the following prototype: \fIsize_t
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function( void *ptr, size_t size, size_t nmemb, void *stream);\fP. This
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function gets called by libcurl as soon as there is received header data that
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needs to be written down. The headers are guaranteed to be written one-by-one
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and only complete lines are written. Parsing headers should be easy enough
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using this. The size of the data pointed to by \fIptr\fP is \fIsize\fP
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multiplied with \fInmemb\fP. The pointer named \fIstream\fP will be the one
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you passed to libcurl with the \fICURLOPT_WRITEHEADER\fP option. Return the
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number of bytes actually written or return -1 to signal error to the library
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(it will cause it to abort the transfer with a \fICURLE_WRITE_ERROR\fP return
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code).
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.IP CURLOPT_WRITEHEADER
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Pass a pointer to be used to write the header part of the received data to. If
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you don't use your own callback to take care of the writing, this must be a
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valid FILE *. See also the \fICURLOPT_HEADERFUNCTION\fP option above on how to
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set a custom get-all-headers callback.
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.IP CURLOPT_DEBUGFUNCTION
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Function pointer that should match the following prototype: \fIint
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curl_debug_callback (CURL *, curl_infotype, char *, size_t, void *);\fP
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\fICURLOPT_DEBUGFUNCTION\fP replaces the standard debug function used when
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\fICURLOPT_VERBOSE \fP is in effect. This callback receives debug information,
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as specified with the \fBcurl_infotype\fP argument. This funtion must return
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0. The data pointed to by the char * passed to this function WILL NOT be zero
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terminated, but will be exactly of the size as told by the size_t argument.
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Available curl_infotype values:
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.RS
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.IP CURLINFO_TEXT
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The data is informational text.
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.IP CURLINFO_HEADER_IN
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The data is header (or header-like) data received from the peer.
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.IP CURLINFO_HEADER_OUT
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The data is header (or header-like) data sent to the peer.
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.IP CURLINFO_DATA_IN
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The data is protocol data received from the peer.
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.IP CURLINFO_DATA_OUT
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The data is protocol data sent to the peer.
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.RE
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.IP CURLOPT_DEBUGDATA
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Pass a pointer to whatever you want passed in to your
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\fICURLOPT_DEBUGFUNCTION\fP in the last void * argument. This pointer is not
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used by libcurl, it is only passed to the callback.
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.IP CURLOPT_SSL_CTX_FUNCTION
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Function pointer that should match the following prototype: \fBCURLcode
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sslctxfun(CURL *curl, void *sslctx, void *parm);\fP This function gets called
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by libcurl just before the initialization of an SSL connection after having
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processed all other SSL related options to give a last chance to an
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application to modify the behaviour of openssl's ssl initilaization. The
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\fIsslctx\fP parameter is actually a pointer to an openssl \fISSL_CTX\fP. If
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an error is returned no attempt to establish a connection is made and the
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perform operation will return the error code from this callback function. Set
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the \fIparm\fP argument with the \fICURLOPT_SSL_CTX_DATA\fP option. This
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option was introduced in 7.11.0.
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\fBNOTE:\fP To use this properly, a non-trivial amount of knowledge of the
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openssl libraries is necessary. Using this function allows for example to use
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openssl callbacks to add additional validation code for certificates, and even
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to change the actual URI of an HTTPS request (example used in the lib509 test
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case). See also the example section for a replacement of the key, certificate
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and trust file settings.
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.IP CURLOPT_SSL_CTX_DATA
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Data pointer to pass to the ssl context callback set by the option
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\fICURLOPT_SSL_CTX_FUNCTION\fP, this is the pointer you'll get as third
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parameter, otherwise \fBNULL\fP. (Added in 7.11.0)
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.SH ERROR OPTIONS
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.IP CURLOPT_ERRORBUFFER
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Pass a char * to a buffer that the libcurl may store human readable error
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messages in. This may be more helpful than just the return code from the
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library. The buffer must be at least CURL_ERROR_SIZE big.
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Use \fICURLOPT_VERBOSE\fP and \fICURLOPT_DEBUGFUNCTION\fP to better
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debug/trace why errors happen.
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\fBNote:\fP if the library does not return an error, the buffer may not have
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been touched. Do not rely on the contents in those cases.
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.IP CURLOPT_STDERR
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Pass a FILE * as parameter. Tell libcurl to use this stream instead of stderr
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when showing the progress meter and displaying \fICURLOPT_VERBOSE\fP data.
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.IP CURLOPT_FAILONERROR
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A non-zero parameter tells the library to fail silently if the HTTP code
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returned is equal to or larger than 300. The default action would be to return
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the page normally, ignoring that code.
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.SH NETWORK OPTIONS
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.IP CURLOPT_URL
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The actual URL to deal with. The parameter should be a char * to a zero
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terminated string. The string must remain present until curl no longer needs
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it, as it doesn't copy the string.
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\fBNOTE:\fP this option is (the only one) required to be set before
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\fIcurl_easy_perform(3)\fP is called.
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.IP CURLOPT_PROXY
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Set HTTP proxy to use. The parameter should be a char * to a zero terminated
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string holding the host name or dotted IP address. To specify port number in
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this string, append :[port] to the end of the host name. The proxy string may
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be prefixed with [protocol]:// since any such prefix will be ignored. The
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proxy's port number may optionally be specified with the separate option
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\fICURLOPT_PROXYPORT\fP.
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\fBNOTE:\fP when you tell the library to use a HTTP proxy, libcurl will
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transparently convert operations to HTTP even if you specify a FTP URL
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etc. This may have an impact on what other features of the library you can
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use, such as \fICURLOPT_QUOTE\fP and similar FTP specifics that don't work
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unless you tunnel through the HTTP proxy. Such tunneling is activated with
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\fICURLOPT_HTTPPROXYTUNNEL\fP.
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\fBNOTE2:\fP libcurl respects the environment variables \fBhttp_proxy\fP,
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\fBftp_proxy\fP, \fBall_proxy\fP etc, if any of those is set.
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.IP CURLOPT_PROXYPORT
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Pass a long with this option to set the proxy port to connect to unless it is
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specified in the proxy string \fICURLOPT_PROXY\fP.
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.IP CURLOPT_PROXYTYPE
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Pass a long with this option to set type of the proxy. Available options for
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this are \fICURLPROXY_HTTP\fP and \fICURLPROXY_SOCKS5\fP, with the HTTP one
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being default. (Added in 7.10)
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.IP CURLOPT_HTTPPROXYTUNNEL
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Set the parameter to non-zero to get the library to tunnel all operations
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through a given HTTP proxy. Note that there is a big difference between using
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a proxy and to tunnel through it. If you don't know what this means, you
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probably don't want this tunneling option.
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.IP CURLOPT_INTERFACE
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Pass a char * as parameter. This set the interface name to use as outgoing
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network interface. The name can be an interface name, an IP address or a host
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name.
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.IP CURLOPT_DNS_CACHE_TIMEOUT
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Pass a long, this sets the timeout in seconds. Name resolves will be kept in
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memory for this number of seconds. Set to zero (0) to completely disable
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caching, or set to -1 to make the cached entries remain forever. By default,
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libcurl caches this info for 60 seconds.
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.IP CURLOPT_DNS_USE_GLOBAL_CACHE
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Pass a long. If the value is non-zero, it tells curl to use a global DNS cache
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that will survive between easy handle creations and deletions. This is not
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thread-safe and this will use a global varible.
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.IP CURLOPT_BUFFERSIZE
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Pass a long specifying your prefered size for the receive buffer in libcurl.
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The main point of this would be that the write callback gets called more often
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and with smaller chunks. This is just treated as a request, not an order. You
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cannot be guaranteed to actually get the given size. (Added in 7.10)
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.IP CURLOPT_PORT
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Pass a long specifying what remote port number to connect to, instead of the
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one specified in the URL or the default port for the used protocol.
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.SH NAMES and PASSWORDS OPTIONS (Authentication)
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.IP CURLOPT_NETRC
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This parameter controls the preference of libcurl between using user names and
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passwords from your \fI~/.netrc\fP file, relative to user names and passwords
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in the URL supplied with \fICURLOPT_URL\fP.
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\fBNote:\fP libcurl uses a user name (and supplied or prompted password)
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supplied with \fICURLOPT_USERPWD\fP in preference to any of the options
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controlled by this parameter.
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Pass a long, set to one of the values described below.
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.RS
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.IP CURL_NETRC_OPTIONAL
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The use of your \fI~/.netrc\fP file is optional,
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and information in the URL is to be preferred. The file will be scanned
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with the host and user name (to find the password only) or with the host only,
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to find the first user name and password after that \fImachine\fP,
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which ever information is not specified in the URL.
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Undefined values of the option will have this effect.
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.IP CURL_NETRC_IGNORED
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The library will ignore the file and use only the information in the URL.
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This is the default.
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.IP CURL_NETRC_REQUIRED
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This value tells the library that use of the file is required,
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to ignore the information in the URL,
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and to search the file with the host only.
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.RE
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Only machine name, user name and password are taken into account
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(init macros and similar things aren't supported).
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\fBNote:\fP libcurl does not verify that the file has the correct properties
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set (as the standard Unix ftp client does). It should only be readable by
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user.
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.IP CURLOPT_NETRC_FILE
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Pass a char * as parameter, pointing to a zero terminated string containing
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the full path name to the file you want libcurl to use as .netrc file. If this
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option is omitted, and CURLOPT_NETRC is set, libcurl will attempt to find the
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a .netrc file in the current user's home directory. (Added in 7.10.9)
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.IP CURLOPT_USERPWD
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Pass a char * as parameter, which should be [user name]:[password] to use for
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the connection. Use \fICURLOPT_HTTPAUTH\fP to decide authentication method.
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When using HTTP and \fICURLOPT_FOLLOWLOCATION\fP, libcurl might perform
|
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several requests to possibly different hosts. libcurl will only send this user
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and password information to hosts using the initial host name (unless
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\fICURLOPT_UNRESTRICTED_AUTH\fP is set), so if libcurl follows locations to
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other hosts it will not send the user and password to those. This is enforced
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to prevent accidental information leakage.
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.IP CURLOPT_PROXYUSERPWD
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Pass a char * as parameter, which should be [user name]:[password] to use for
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the connection to the HTTP proxy. Use \fICURLOPT_PROXYAUTH\fP to decide
|
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authentication method.
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.IP CURLOPT_HTTPAUTH
|
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Pass a long as parameter, which is set to a bitmask, to tell libcurl what
|
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authentication method(s) you want it to use. The available bits are listed
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below. If more than one bit is set, libcurl will first query the site to see
|
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what authentication methods it supports and then pick the best one you allow
|
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it to use. Note that for some methods, this will induce an extra network
|
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round-trip. Set the actual name and password with the \fICURLOPT_USERPWD\fP
|
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option. (Added in 7.10.6)
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.RS
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.IP CURLAUTH_BASIC
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|
HTTP Basic authentication. This is the default choice, and the only method
|
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that is in wide-spread use and supported virtually everywhere. This is sending
|
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the user name and password over the network in plain text, easily captured by
|
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others.
|
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.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
|
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regular old-fashioned Basic method.
|
|
.IP CURLAUTH_GSSNEGOTIATE
|
|
HTTP GSS-Negotiate authentication. The GSS-Negotiate (also known as plain
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"Negotiate") method was designed by Microsoft and is used in their web
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aplications. It is primarily meant as a support for Kerberos5 authentication
|
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but may be also used along with another authentication methods. For more
|
|
information see IETF draft draft-brezak-spnego-http-04.txt.
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\fBNOTE\fP that you need to build libcurl with a suitable GSS-API library for
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this to work.
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.IP CURLAUTH_NTLM
|
|
HTTP NTLM authentication. A proprietary protocol invented and used by
|
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Microsoft. It uses a challenge-response and hash concept similar to Digest, to
|
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prevent the password from being evesdropped.
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\fBNOTE\fP that you need to build libcurl with SSL support for this option to
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work.
|
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.IP CURLAUTH_ANY
|
|
This is a convenience macro that sets all bits and thus makes libcurl pick any
|
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it finds suitable. libcurl will automaticly select the one it finds most
|
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secure.
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.IP CURLAUTH_ANYSAFE
|
|
This is a convenience macro that sets all bits except Basic and thus makes
|
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libcurl pick any it finds suitable. libcurl will automaticly select the one it
|
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finds most secure.
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.RE
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.IP CURLOPT_PROXYAUTH
|
|
Pass a long as parameter, which is set to a bitmask, to tell libcurl what
|
|
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. Note that 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 and NTLM work. (Added in 7.10.7)
|
|
.SH HTTP OPTIONS
|
|
.IP CURLOPT_AUTOREFERER
|
|
Pass a non-zero parameter to enable this. When enabled, libcurl will
|
|
automaticly set the Referer: field in requests where it follows a Location:
|
|
redirect.
|
|
.IP CURLOPT_ENCODING
|
|
Sets the contents of the Accept-Encoding: header sent in an 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.
|
|
.IP CURLOPT_FOLLOWLOCATION
|
|
A non-zero parameter tells the library to follow any Location: header that the
|
|
server sends as part of a HTTP header.
|
|
|
|
\fBNOTE:\fP 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.
|
|
.IP CURLOPT_UNRESTRICTED_AUTH
|
|
A non-zero parameter tells the library it can continue to send authentication
|
|
(user+password) when following locations, even when hostname changed. Note
|
|
that this 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.
|
|
.IP CURLOPT_PUT
|
|
A non-zero parameter tells the library to use HTTP PUT to transfer data. The
|
|
data should be set with \fICURLOPT_READDATA\fP and \fICURLOPT_INFILESIZE\fP.
|
|
.IP CURLOPT_POST
|
|
A non-zero parameter tells the library to do a regular HTTP post. This is a
|
|
normal application/x-www-form-urlencoded kind, which is the most commonly used
|
|
one by HTML forms. See the \fICURLOPT_POSTFIELDS\fP option for how to specify
|
|
the data to post and \fICURLOPT_POSTFIELDSIZE\fP in how to set the data
|
|
size. Using the \fICURLOPT_POSTFIELDS\fP option implies this option.
|
|
.IP CURLOPT_POSTFIELDS
|
|
Pass a char * as parameter, which should be the full data to post in a HTTP
|
|
post operation. You need to 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. Take note.
|
|
|
|
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.
|
|
|
|
\fBNote:\fP to make multipart/formdata posts (aka rfc1867-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 zero, the library will use strlen() to get the size.
|
|
.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 HTTP post structs as parameter. The linked list should be a fully valid
|
|
list of 'struct HttpPost' structs properly filled in. The best and most
|
|
elegant way to do this, 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.
|
|
.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
|
|
contents 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. 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 (usually containing a GET or POST) is not a header
|
|
and cannot be replaced using this option. Only the lines following the
|
|
request-line are headers.
|
|
|
|
\fBNOTE:\fPThe 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.
|
|
|
|
\fBNOTE:\fPThe alias itself is not parsed for any version strings. So if your
|
|
alias is "MYHTTP/9.9", Libcurl will not treat the server as responding with
|
|
HTTP version 9.9. Instead Libcurl will use the value set by option
|
|
\fICURLOPT_HTTP_VERSION\fP.
|
|
.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 mulitple cookies, you need to set them all using a single
|
|
option and thus you need to concat them all in one single string. Set multiple
|
|
cookies in one string like this: "name1=content1; name2=content2;" etc.
|
|
|
|
Using this option multiple times will only make the latest string override the
|
|
previously 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, this option will enable cookies for this
|
|
curl handle, making it understand and parse received cookies and then use
|
|
matching cookies in future request.
|
|
.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.
|
|
|
|
\fBNOTE:\fP If the cookie jar file can't be created or written to (when the
|
|
curl_easy_cleanup() 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 non-zero 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 are not. Session
|
|
cookies are cookies without expiry date and they are meant to be alive and
|
|
existing for this "session" only.
|
|
.IP CURLOPT_HTTPGET
|
|
Pass a long. If the long is non-zero, this forces the HTTP request to get back
|
|
to GET. Only really usable if POST, PUT or a custom request have been used
|
|
previously using the same curl handle.
|
|
.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
|
|
.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, an network interface name (under Unix) or
|
|
just a '-' letter to let the library use your systems default IP
|
|
address. Default FTP operations are passive, and thus won't use PORT.
|
|
|
|
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 commands to pass to the server prior to
|
|
your ftp request. This will be done before any other FTP commands are issued
|
|
(even before the CWD command). The linked list should be a fully valid list of
|
|
'struct curl_slist' structs properly filled in. 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.
|
|
.IP CURLOPT_POSTQUOTE
|
|
Pass a pointer to a linked list of FTP commands to pass to the server after
|
|
your ftp transfer request. 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.
|
|
.IP CURLOPT_FTPLISTONLY
|
|
A non-zero parameter tells the library to just list the names of an ftp
|
|
directory, instead of doing a full directory listing that would include file
|
|
sizes, dates etc.
|
|
|
|
This causes an FTP NLST command to be sent. Beware that some FTP servers list
|
|
only files in their response to NLST; they might not include subdirectories
|
|
and symbolic links.
|
|
.IP CURLOPT_FTPAPPEND
|
|
A non-zero parameter tells the library to append to the remote file instead of
|
|
overwrite it. This is only useful when uploading to a ftp site.
|
|
.IP CURLOPT_FTP_USE_EPRT
|
|
Pass a long. If the value is non-zero, 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 FALSE (zero) to this
|
|
option, it will not try using EPRT or LPRT, only plain PORT. (Added in 7.10.5)
|
|
.IP CURLOPT_FTP_USE_EPSV
|
|
Pass a long. If the value is non-zero, 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 FALSE (zero) to this option, it will not try using EPSV, only plain PASV.
|
|
.IP CURLOPT_FTP_CREATE_MISSING_DIRS
|
|
Pass a long. If the value is non-zero, 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)
|
|
.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. Note that 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_SSL
|
|
Pass a long using one of the values from below, to make libcurl use your
|
|
desired level of SSL for the ftp transfer. (Added in 7.11.0)
|
|
.RS
|
|
.IP CURLFTPSSL_NONE
|
|
Don't attempt to use SSL.
|
|
.IP CURLFTPSSL_TRY
|
|
Try using SSL, proceed as normal otherwise.
|
|
.IP CURLFTPSSL_CONTROL
|
|
Require SSL for the control connection or fail with \fICURLE_FTP_SSL_FAILED\fP.
|
|
.IP CURLFTPSSL_ALL
|
|
Require SSL for all communication or fail with \fICURLE_FTP_SSL_FAILED\fP.
|
|
.RE
|
|
.SH PROTOCOL OPTIONS
|
|
.IP CURLOPT_TRANSFERTEXT
|
|
A non-zero parameter tells the library to use ASCII mode for ftp transfers,
|
|
instead of the default binary transfer. For LDAP transfers it gets the data in
|
|
plain text instead of HTML and 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.
|
|
.IP CURLOPT_CRLF
|
|
Convert Unix newlines to CRLF newlines on transfers.
|
|
.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).
|
|
.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.
|
|
.IP CURLOPT_RESUME_FROM_LARGE
|
|
Pass an 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 will be user
|
|
instead of GET or HEAD when doing a HTTP request, or instead of LIST or NLST
|
|
when doing an ftp directory listing. This is useful for doing DELETE or other
|
|
more or less obscure HTTP requests. Don't do this at will, make sure your
|
|
server supports the command first.
|
|
|
|
NOTE: 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.
|
|
.IP CURLOPT_FILETIME
|
|
Pass a long. If it is a non-zero value, 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 non-zero parameter 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.
|
|
.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.
|
|
.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)
|
|
.IP CURLOPT_UPLOAD
|
|
A non-zero parameter tells the library to prepare for an upload. The
|
|
\fICURLOPT_READDATA\fP and \fICURLOPT_INFILESIZE_LARGE\fP are also interesting
|
|
for uploads.
|
|
.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.
|
|
|
|
NOTE: 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)
|
|
|
|
NOTE: 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 and FTP.
|
|
|
|
NOTE: 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 have not been met.
|
|
.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.
|
|
|
|
\fBNOTE:\fP this is not recommended to use in unix multi-threaded programs, as
|
|
it uses signals unless \fICURLOPT_NOSIGNAL\fP (see above) is set.
|
|
.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_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. Default is 5, and there isn't much point in changing this
|
|
value unless you are perfectly aware of how this work and changes libcurl's
|
|
behaviour. This concerns connection using any of the protocols that support
|
|
persistent connections.
|
|
|
|
When reaching the maximum limit, curl uses the \fICURLOPT_CLOSEPOLICY\fP to
|
|
figure out which of the existing connections to close to prevent the number of
|
|
open connections to increase.
|
|
|
|
\fBNOTE:\fP if you already have performed transfers with this curl handle,
|
|
setting a smaller MAXCONNECTS than before may cause open connections to get
|
|
closed unnecessarily.
|
|
.IP CURLOPT_CLOSEPOLICY
|
|
Pass a long. This option sets what policy libcurl should use when the
|
|
connection cache is filled and one of the open connections has to be closed to
|
|
make room for a new connection. This must be one of the CURLCLOSEPOLICY_*
|
|
defines. Use \fICURLCLOSEPOLICY_LEAST_RECENTLY_USED\fP to make libcurl close
|
|
the connection that was least recently used, that connection is also least
|
|
likely to be capable of re-use. Use \fICURLCLOSEPOLICY_OLDEST\fP to make
|
|
libcurl close the oldest connection, the one that was created first among the
|
|
ones in the connection cache. The other close policies are not support
|
|
yet.
|
|
.IP CURLOPT_FRESH_CONNECT
|
|
Pass a long. Set to non-zero 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 non-zero to make the next transfer explicitly close the
|
|
connection when done. Normally, libcurl keep all connections alive when done
|
|
with one transfer in case there comes a succeeding one 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 possibly 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 disable
|
|
connection timeout (it will then only timeout on the system's internal
|
|
timeouts). See also the \fICURLOPT_TIMEOUT\fP option.
|
|
|
|
\fBNOTE:\fP this is not recommended to use in unix multi-threaded programs, as
|
|
it uses signals unless \fICURLOPT_NOSIGNAL\fP (see above) is set.
|
|
.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
|
|
.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 "PEM" and can be
|
|
changed with \fICURLOPT_SSLCERTTYPE\fP.
|
|
.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". (Added
|
|
in 7.9.3)
|
|
.IP CURLOPT_SSLCERTPASSWD
|
|
Pass a pointer to a zero terminated string as parameter. It will be used as
|
|
the password required to use the \fICURLOPT_SSLCERT\fP certificate.
|
|
|
|
This option is replaced by \fICURLOPT_SSLKEYPASSWD\fP and should only be used
|
|
for backward compatibility. You never needed a pass phrase to load a
|
|
certificate but you need one to load your private key.
|
|
.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.
|
|
.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".
|
|
|
|
\fBNOTE:\fPThe 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.
|
|
.IP CURLOPT_SSLKEYPASSWD
|
|
Pass a pointer to a zero terminated string as parameter. It will be used as
|
|
the password required to use the \fICURLOPT_SSLKEY\fP private key.
|
|
.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.
|
|
|
|
\fBNOTE:\fPIf 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 (asymetric) crypto
|
|
operations.
|
|
|
|
\fBNOTE:\fPIf the crypto device cannot be set,
|
|
\fICURLE_SSL_ENGINE_SETFAILED\fP is returned.
|
|
.IP CURLOPT_SSLVERSION
|
|
Pass a long as parameter. Set what version of SSL to attempt to use, 2 or
|
|
3. By default, the SSL library will try to solve this by itself although some
|
|
servers make this difficult why you at times may have to use this option.
|
|
.IP CURLOPT_SSL_VERIFYPEER
|
|
Pass a long that is set to a zero value to stop curl from verifying the peer's
|
|
certificate (7.10 starting setting this option to non-zero by default).
|
|
Alternate certificates to verify against can be specified with the
|
|
\fICURLOPT_CAINFO\fP option or a certificate directory can be specified with
|
|
the \fICURLOPT_CAPATH\fP option. As of 7.10, curl installs a default bundle.
|
|
\fICURLOPT_SSL_VERIFYHOST\fP may also need to be set to 1 or 0 if
|
|
\fICURLOPT_SSL_VERIFYPEER\fP is disabled (it defaults to 2).
|
|
.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 only makes sense when used in
|
|
combination with the \fICURLOPT_SSL_VERIFYPEER\fP option.
|
|
.IP CURLOPT_CAPATH
|
|
Pass a char * to a zero terminated string naming a directory holding multiple
|
|
CA certificates to verify the peer with. The certificate directory must be
|
|
prepared using the openssl c_rehash utility. This only makes sense when used
|
|
in combination with the \fICURLOPT_SSL_VERIFYPEER\fP option. The
|
|
\fICURLOPT_CAPATH\fP function apparently does not work in Windows due to some
|
|
limitation in openssl. (Added in 7.9.8)
|
|
.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_VERIFYHOST
|
|
Pass a long. Set if we should verify the Common name from the peer certificate
|
|
in the SSL handshake, set 1 to check existence, 2 to ensure that it matches
|
|
the provided hostname. This is by default set to 2. (default changed in 7.10)
|
|
.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 syntactly 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. 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
|
|
.IP CURLOPT_KRB4LEVEL
|
|
Pass a char * as parameter. Set the krb4 security level, this also enables
|
|
krb4 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 kerberos4. The kerberos
|
|
support only works for FTP.
|
|
.SH OTHER OPTIONS
|
|
.IP CURLOPT_PRIVATE
|
|
Pass a char * as parameter, pointing to data that should be associated with
|
|
this curl handle. The pointer can subsequently be retrieved using
|
|
\fIcurl_easy_getinfo\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, you \fBMUST\fP use the locking methods in the
|
|
share handle. See \fIcurl_share_setopt(3)\fP for details.
|
|
.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.
|
|
.SH "SEE ALSO"
|
|
.BR curl_easy_init "(3), " curl_easy_cleanup "(3), "
|