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http: add support to read and store the referrer header
- add CURLINFO_REFERER libcurl option - add --write-out '%{referer}' command-line option - extend --xattr command-line option to fill user.xdg.referrer.url extended attribute with the referrer (if there was any) Closes #xxxx
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/*************************************************************************** | ||
* _ _ ____ _ | ||
* Project ___| | | | _ \| | | ||
* / __| | | | |_) | | | ||
* | (__| |_| | _ <| |___ | ||
* \___|\___/|_| \_\_____| | ||
* | ||
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al. | ||
* | ||
* This software is licensed as described in the file COPYING, which | ||
* you should have received as part of this distribution. The terms | ||
* are also available at https://curl.se/docs/copyright.html. | ||
* | ||
* You may opt to use, copy, modify, merge, publish, distribute and/or sell | ||
* copies of the Software, and permit persons to whom the Software is | ||
* furnished to do so, under the terms of the COPYING file. | ||
* | ||
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
* KIND, either express or implied. | ||
* | ||
***************************************************************************/ | ||
/* <DESC> | ||
* Show how to extract referrer header. | ||
* </DESC> | ||
*/ | ||
#include <stdio.h> | ||
#include <curl/curl.h> | ||
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int main(void) | ||
{ | ||
CURL *curl; | ||
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curl = curl_easy_init(); | ||
if(curl) { | ||
CURLcode res; | ||
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); | ||
curl_easy_setopt(curl, CURLOPT_REFERER, "https://example.org/referrer"); | ||
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/* Perform the request, res will get the return code */ | ||
res = curl_easy_perform(curl); | ||
/* Check for errors */ | ||
if(res != CURLE_OK) | ||
fprintf(stderr, "curl_easy_perform() failed: %s\n", | ||
curl_easy_strerror(res)); | ||
else { | ||
char *hdr; | ||
res = curl_easy_getinfo(curl, CURLINFO_REFERER, &hdr); | ||
if((res == CURLE_OK) && hdr) | ||
printf("Referrer header: %s\n", hdr); | ||
} | ||
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/* always cleanup */ | ||
curl_easy_cleanup(curl); | ||
} | ||
return 0; | ||
} |
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.\" ************************************************************************** | ||
.\" * _ _ ____ _ | ||
.\" * Project ___| | | | _ \| | | ||
.\" * / __| | | | |_) | | | ||
.\" * | (__| |_| | _ <| |___ | ||
.\" * \___|\___/|_| \_\_____| | ||
.\" * | ||
.\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al. | ||
.\" * | ||
.\" * This software is licensed as described in the file COPYING, which | ||
.\" * you should have received as part of this distribution. The terms | ||
.\" * are also available at https://curl.se/docs/copyright.html. | ||
.\" * | ||
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell | ||
.\" * copies of the Software, and permit persons to whom the Software is | ||
.\" * furnished to do so, under the terms of the COPYING file. | ||
.\" * | ||
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
.\" * KIND, either express or implied. | ||
.\" * | ||
.\" ************************************************************************** | ||
.\" | ||
.TH CURLINFO_REFERER 3 "11 Feb 2021" "libcurl 7.76.0" "curl_easy_getinfo options" | ||
.SH NAME | ||
CURLINFO_REFERER \- get the referrer header | ||
.SH SYNOPSIS | ||
#include <curl/curl.h> | ||
|
||
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_REFERER, char **hdrp); | ||
.SH DESCRIPTION | ||
Pass in a pointer to a char pointer and get the referrer header. | ||
|
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The \fBhdrp\fP pointer will be NULL or pointing to private memory you MUST NOT | ||
free - it gets freed when you call \fIcurl_easy_cleanup(3)\fP on the | ||
corresponding CURL handle. | ||
.SH PROTOCOLS | ||
HTTP(S) | ||
.SH EXAMPLE | ||
.nf | ||
CURL *curl = curl_easy_init(); | ||
if(curl) { | ||
CURLcode res; | ||
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); | ||
curl_easy_setopt(curl, CURLOPT_REFERER, "https://example.org/referrer"); | ||
res = curl_easy_perform(curl); | ||
if(res == CURLE_OK) { | ||
char *hdr = NULL; | ||
curl_easy_getinfo(curl, CURLINFO_REFERER, &hdr); | ||
if(hdr) | ||
printf("Referrer header: %s\\n", hdr); | ||
} | ||
curl_easy_cleanup(curl); | ||
} | ||
.fi | ||
.SH AVAILABILITY | ||
Added in 7.76.0 | ||
.SH RETURN VALUE | ||
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. | ||
.SH "SEE ALSO" | ||
.BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), " | ||
.BR CURLOPT_REFERER "(3), " |
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