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328 lines
16 KiB
Groff
328 lines
16 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 - 2015, 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_getinfo 3 "11 Feb 2009" "libcurl 7.19.4" "libcurl Manual"
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.SH NAME
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curl_easy_getinfo - extract information from a curl handle
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.SH SYNOPSIS
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.B #include <curl/curl.h>
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.B "CURLcode curl_easy_getinfo(CURL *curl, CURLINFO info, ... );"
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.SH DESCRIPTION
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Request internal information from the curl session with this function. The
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third argument \fBMUST\fP be a pointer to a long, a pointer to a char *, a
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pointer to a struct curl_slist * or a pointer to a double (as this
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documentation describes further down). The data pointed-to will be filled in
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accordingly and can be relied upon only if the function returns CURLE_OK. Use
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this function AFTER a performed transfer if you want to get transfer- oriented
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data.
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You should not free the memory returned by this function unless it is
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explicitly mentioned below.
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.SH AVAILABLE INFORMATION
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The following information can be extracted:
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.IP CURLINFO_EFFECTIVE_URL
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Pass a pointer to a char pointer to receive the last used effective URL.
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.IP CURLINFO_RESPONSE_CODE
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Pass a pointer to a long to receive the last received HTTP, FTP or SMTP
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response code. This option was previously known as CURLINFO_HTTP_CODE in
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libcurl 7.10.7 and earlier. The value will be zero if no server response code
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has been received. Note that a proxy's CONNECT response should be read with
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\fICURLINFO_HTTP_CONNECTCODE\fP and not this.
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Support for SMTP responses added in 7.25.0.
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.IP CURLINFO_HTTP_CONNECTCODE
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Pass a pointer to a long to receive the last received proxy response code to a
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CONNECT request.
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.IP CURLINFO_FILETIME
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Pass a pointer to a long to receive the remote time of the retrieved document
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(in number of seconds since 1 jan 1970 in the GMT/UTC time zone). If you get
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-1, it can be because of many reasons (unknown, the server hides it or the
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server doesn't support the command that tells document time etc) and the time
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of the document is unknown. Note that you must tell the server to collect this
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information before the transfer is made, by using the
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\fICURLOPT_FILETIME(3)\fP option to \fIcurl_easy_setopt(3)\fP or you will
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unconditionally get a -1 back. (Added in 7.5)
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.IP CURLINFO_TOTAL_TIME
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Pass a pointer to a double to receive the total time in seconds for the
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previous transfer, including name resolving, TCP connect etc.
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.IP CURLINFO_NAMELOOKUP_TIME
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Pass a pointer to a double to receive the time, in seconds, it took from the
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start until the name resolving was completed.
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.IP CURLINFO_CONNECT_TIME
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Pass a pointer to a double to receive the time, in seconds, it took from the
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start until the connect to the remote host (or proxy) was completed.
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.IP CURLINFO_APPCONNECT_TIME
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Pass a pointer to a double to receive the time, in seconds, it took from the
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start until the SSL/SSH connect/handshake to the remote host was completed.
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This time is most often very near to the PRETRANSFER time, except for cases
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such as HTTP pipelining where the pretransfer time can be delayed due to waits
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in line for the pipeline and more. (Added in 7.19.0)
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.IP CURLINFO_PRETRANSFER_TIME
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Pass a pointer to a double to receive the time, in seconds, it took from the
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start until the file transfer is just about to begin. This includes all
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pre-transfer commands and negotiations that are specific to the particular
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protocol(s) involved. It does \fInot\fP involve the sending of the protocol-
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specific request that triggers a transfer.
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.IP CURLINFO_STARTTRANSFER_TIME
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Pass a pointer to a double to receive the time, in seconds, it took from the
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start until the first byte is received by libcurl. This includes
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CURLINFO_PRETRANSFER_TIME and also the time the server needs to calculate the
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result.
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.IP CURLINFO_REDIRECT_TIME
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Pass a pointer to a double to receive the total time, in seconds, it took for
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all redirection steps include name lookup, connect, pretransfer and transfer
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before final transaction was started. CURLINFO_REDIRECT_TIME contains the
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complete execution time for multiple redirections. (Added in 7.9.7)
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.IP CURLINFO_REDIRECT_COUNT
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Pass a pointer to a long to receive the total number of redirections that were
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actually followed. (Added in 7.9.7)
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.IP CURLINFO_REDIRECT_URL
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Pass a pointer to a char pointer to receive the URL a redirect \fIwould\fP
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take you to if you would enable \fICURLOPT_FOLLOWLOCATION(3)\fP. This can come
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very handy if you think using the built-in libcurl redirect logic isn't good
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enough for you but you would still prefer to avoid implementing all the magic
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of figuring out the new URL. (Added in 7.18.2)
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.IP CURLINFO_SIZE_UPLOAD
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Pass a pointer to a double to receive the total amount of bytes that were
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uploaded.
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.IP CURLINFO_SIZE_DOWNLOAD
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Pass a pointer to a double to receive the total amount of bytes that were
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downloaded. The amount is only for the latest transfer and will be reset again
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for each new transfer. This counts actual payload data, what's also commonly
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called body. All meta and header data are excluded and will not be counted in
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this number.
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.IP CURLINFO_SPEED_DOWNLOAD
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Pass a pointer to a double to receive the average download speed that curl
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measured for the complete download. Measured in bytes/second.
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.IP CURLINFO_SPEED_UPLOAD
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Pass a pointer to a double to receive the average upload speed that curl
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measured for the complete upload. Measured in bytes/second.
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.IP CURLINFO_HEADER_SIZE
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Pass a pointer to a long to receive the total size of all the headers
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received. Measured in number of bytes.
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.IP CURLINFO_REQUEST_SIZE
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Pass a pointer to a long to receive the total size of the issued
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requests. This is so far only for HTTP requests. Note that this may be more
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than one request if FOLLOWLOCATION is true.
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.IP CURLINFO_SSL_VERIFYRESULT
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Pass a pointer to a long to receive the result of the certification
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verification that was requested (using the \fICURLOPT_SSL_VERIFYPEER(3)\fP
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option to \fIcurl_easy_setopt(3)\fP).
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.IP CURLINFO_SSL_ENGINES
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Pass the address of a 'struct curl_slist *' to receive a linked-list of
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OpenSSL crypto-engines supported. Note that engines are normally implemented
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in separate dynamic libraries. Hence not all the returned engines may be
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available at run-time. \fBNOTE:\fP you must call \fIcurl_slist_free_all(3)\fP
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on the list pointer once you're done with it, as libcurl will not free the
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data for you. (Added in 7.12.3)
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.IP CURLINFO_CONTENT_LENGTH_DOWNLOAD
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Pass a pointer to a double to receive the content-length of the download. This
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is the value read from the Content-Length: field. Since 7.19.4, this returns -1
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if the size isn't known.
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.IP CURLINFO_CONTENT_LENGTH_UPLOAD
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Pass a pointer to a double to receive the specified size of the upload. Since
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7.19.4, this returns -1 if the size isn't known.
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.IP CURLINFO_CONTENT_TYPE
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Pass a pointer to a char pointer to receive the content-type of the downloaded
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object. This is the value read from the Content-Type: field. If you get NULL,
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it means that the server didn't send a valid Content-Type header or that the
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protocol used doesn't support this.
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.IP CURLINFO_PRIVATE
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Pass a pointer to a char pointer to receive the pointer to the private data
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associated with the curl handle (set with the \fICURLOPT_PRIVATE(3)\fP option
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to \fIcurl_easy_setopt(3)\fP). Please note that for internal reasons, the
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value is returned as a char pointer, although effectively being a 'void *'.
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(Added in 7.10.3)
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.IP CURLINFO_HTTPAUTH_AVAIL
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Pass a pointer to a long to receive a bitmask indicating the authentication
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method(s) available. The meaning of the bits is explained in the
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\fICURLOPT_HTTPAUTH(3)\fP option for \fIcurl_easy_setopt(3)\fP. (Added in
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7.10.8)
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.IP CURLINFO_PROXYAUTH_AVAIL
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Pass a pointer to a long to receive a bitmask indicating the authentication
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method(s) available for your proxy authentication. (Added in 7.10.8)
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.IP CURLINFO_OS_ERRNO
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Pass a pointer to a long to receive the errno variable from a connect failure.
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Note that the value is only set on failure, it is not reset upon a
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successful operation. (Added in 7.12.2)
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.IP CURLINFO_NUM_CONNECTS
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Pass a pointer to a long to receive how many new connections libcurl had to
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create to achieve the previous transfer (only the successful connects are
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counted). Combined with \fICURLINFO_REDIRECT_COUNT\fP you are able to know
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how many times libcurl successfully reused existing connection(s) or not. See
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the Connection Options of \fIcurl_easy_setopt(3)\fP to see how libcurl tries
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to make persistent connections to save time. (Added in 7.12.3)
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.IP CURLINFO_PRIMARY_IP
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Pass a pointer to a char pointer to receive the pointer to a zero-terminated
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string holding the IP address of the most recent connection done with this
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\fBcurl\fP handle. This string may be IPv6 if that's enabled. Note that you
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get a pointer to a memory area that will be re-used at next request so you
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need to copy the string if you want to keep the information. (Added in 7.19.0)
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.IP CURLINFO_PRIMARY_PORT
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Pass a pointer to a long to receive the destination port of the most recent
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connection done with this \fBcurl\fP handle. (Added in 7.21.0)
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.IP CURLINFO_LOCAL_IP
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Pass a pointer to a char pointer to receive the pointer to a zero-terminated
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string holding the local (source) IP address of the most recent connection done
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with this \fBcurl\fP handle. This string may be IPv6 if that's enabled. The
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same restrictions apply as to \fICURLINFO_PRIMARY_IP\fP. (Added in 7.21.0)
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.IP CURLINFO_LOCAL_PORT
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Pass a pointer to a long to receive the local (source) port of the most recent
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connection done with this \fBcurl\fP handle. (Added in 7.21.0)
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.IP CURLINFO_COOKIELIST
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Pass a pointer to a 'struct curl_slist *' to receive a linked-list of all
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cookies cURL knows (expired ones, too). Don't forget to
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\fIcurl_slist_free_all(3)\fP the list after it has been used. If there are no
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cookies (cookies for the handle have not been enabled or simply none have been
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received) 'struct curl_slist *' will be set to point to NULL. (Added in
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7.14.1)
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.IP CURLINFO_LASTSOCKET
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Pass a pointer to a long to receive the last socket used by this curl
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session. If the socket is no longer valid, -1 is returned. When you finish
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working with the socket, you must call curl_easy_cleanup() as usual and let
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libcurl close the socket and cleanup other resources associated with the
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handle. This is typically used in combination with
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\fICURLOPT_CONNECT_ONLY(3)\fP. (Added in 7.15.2)
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NOTE: this API is not really working on win64, since the SOCKET type on win64
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is 64 bit large while its 'long' is only 32 bits.
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.IP CURLINFO_FTP_ENTRY_PATH
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Pass a pointer to a char pointer to receive a pointer to a string holding the
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path of the entry path. That is the initial path libcurl ended up in when
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logging on to the remote FTP server. This stores a NULL as pointer if
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something is wrong. (Added in 7.15.4)
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Also works for SFTP since 7.21.4
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.IP CURLINFO_CERTINFO
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Pass a pointer to a 'struct curl_certinfo *' and you'll get it set to point to
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struct that holds a number of linked lists with info about the certificate
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chain, assuming you had \fICURLOPT_CERTINFO(3)\fP enabled when the previous
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request was done. The struct reports how many certs it found and then you can
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extract info for each of those certs by following the linked lists. The info
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chain is provided in a series of data in the format "name:content" where the
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content is for the specific named data. See also the certinfo.c example. NOTE:
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this option is only available in libcurl built with OpenSSL, NSS or GSKit
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support. (Added in 7.19.1)
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.IP CURLINFO_TLS_SESSION
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Pass a pointer to a 'struct curl_tlssessioninfo *'. The pointer will be
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initialized to refer to a 'struct curl_tlssessioninfo *' that will contain an
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enum indicating the SSL library used for the handshake and the respective
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internal TLS session structure of this underlying SSL library.
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This may then be used to extract certificate information in a format
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convenient for further processing, such as manual validation. NOTE: this
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option may not be available for all SSL backends; unsupported SSL backends
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will return 'CURLSSLBACKEND_NONE' to indicate that they are not supported;
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this does not mean that no SSL backend was used. (Added in 7.34.0)
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.nf
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struct curl_tlssessioninfo {
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curl_sslbackend backend;
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void *internals;
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};
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.fi
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The \fIinternals\fP struct member will point to a TLS library specific pointer
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with the following underlying types:
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.RS
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.IP OpenSSL
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SSL_CTX *
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.IP GnuTLS
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gnutls_session_t
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.IP NSS
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PRFileDesc *
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.IP gskit
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gsk_handle
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.RE
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.IP CURLINFO_CONDITION_UNMET
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Pass a pointer to a long to receive the number 1 if the condition provided in
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the previous request didn't match (see \fICURLOPT_TIMECONDITION(3)\fP). Alas,
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if this returns a 1 you know that the reason you didn't get data in return is
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because it didn't fulfill the condition. The long ths argument points to will
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get a zero stored if the condition instead was met. (Added in 7.19.4)
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.IP CURLINFO_RTSP_SESSION_ID
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Pass a pointer to a char pointer to receive a pointer to a string holding the
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most recent RTSP Session ID.
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Applications wishing to resume an RTSP session on another connection should
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retrieve this info before closing the active connection.
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.IP CURLINFO_RTSP_CLIENT_CSEQ
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Pass a pointer to a long to receive the next CSeq that will be used by the
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application.
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.IP CURLINFO_RTSP_SERVER_CSEQ
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Pass a pointer to a long to receive the next server CSeq that will be expected
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by the application.
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\fI(NOTE: listening for server initiated requests is currently
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unimplemented).\fP
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Applications wishing to resume an RTSP session on another connection should
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retrieve this info before closing the active connection.
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.IP CURLINFO_RTSP_CSEQ_RECV
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Pass a pointer to a long to receive the most recently received CSeq from the
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server. If your application encounters a \fICURLE_RTSP_CSEQ_ERROR\fP then you
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may wish to troubleshoot and/or fix the CSeq mismatch by peeking at this value.
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.SH TIMES
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.nf
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An overview of the six time values available from curl_easy_getinfo()
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curl_easy_perform()
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|--NAMELOOKUP
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|--|--CONNECT
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|--|--|--APPCONNECT
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|--|--|--|--PRETRANSFER
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|--|--|--|--|--STARTTRANSFER
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|--|--|--|--|--|--TOTAL
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|--|--|--|--|--|--REDIRECT
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.fi
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.IP NAMELOOKUP
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\fICURLINFO_NAMELOOKUP_TIME\fP. The time it took from the start until the name
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resolving was completed.
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.IP CONNECT
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\fICURLINFO_CONNECT_TIME\fP. The time it took from the start until the connect
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to the remote host (or proxy) was completed.
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.IP APPCONNECT
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\fICURLINFO_APPCONNECT_TIME\fP. The time it took from the start until the SSL
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connect/handshake with the remote host was completed. (Added in in 7.19.0)
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.IP PRETRANSFER
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\fICURLINFO_PRETRANSFER_TIME\fP. The time it took from the start until the
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file transfer is just about to begin. This includes all pre-transfer commands
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and negotiations that are specific to the particular protocol(s) involved.
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.IP STARTTRANSFER
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\fICURLINFO_STARTTRANSFER_TIME\fP. The time it took from the start until the
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first byte is received by libcurl.
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.IP TOTAL
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\fICURLINFO_TOTAL_TIME\fP. Total time of the previous request.
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.IP REDIRECT
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\fICURLINFO_REDIRECT_TIME\fP. The time it took for all redirection steps
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include name lookup, connect, pretransfer and transfer before final
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transaction was started. So, this is zero if no redirection took place.
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.SH RETURN VALUE
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If the operation was successful, CURLE_OK is returned. Otherwise an
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appropriate error code will be returned.
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.SH "SEE ALSO"
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.BR curl_easy_setopt "(3)"
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