| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2017, 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.haxx.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> |
| * Issue an HTTP POST and provide the data through the read callback. |
| * </DESC> |
| */ |
| #include <stdio.h> |
| #include <string.h> |
| #include <curl/curl.h> |
| |
| /* silly test data to POST */ |
| static const char data[]="Lorem ipsum dolor sit amet, consectetur adipiscing " |
| "elit. Sed vel urna neque. Ut quis leo metus. Quisque eleifend, ex at " |
| "laoreet rhoncus, odio ipsum semper metus, at tempus ante urna in mauris. " |
| "Suspendisse ornare tempor venenatis. Ut dui neque, pellentesque a varius " |
| "eget, mattis vitae ligula. Fusce ut pharetra est. Ut ullamcorper mi ac " |
| "sollicitudin semper. Praesent sit amet tellus varius, posuere nulla non, " |
| "rhoncus ipsum."; |
| |
| struct WriteThis { |
| const char *readptr; |
| size_t sizeleft; |
| }; |
| |
| static size_t read_callback(void *dest, size_t size, size_t nmemb, void *userp) |
| { |
| struct WriteThis *wt = (struct WriteThis *)userp; |
| size_t buffer_size = size*nmemb; |
| |
| if(wt->sizeleft) { |
| /* copy as much as possible from the source to the destination */ |
| size_t copy_this_much = wt->sizeleft; |
| if(copy_this_much > buffer_size) |
| copy_this_much = buffer_size; |
| memcpy(dest, wt->readptr, copy_this_much); |
| |
| wt->readptr += copy_this_much; |
| wt->sizeleft -= copy_this_much; |
| return copy_this_much; /* we copied this many bytes */ |
| } |
| |
| return 0; /* no more data left to deliver */ |
| } |
| |
| int main(void) |
| { |
| CURL *curl; |
| CURLcode res; |
| |
| struct WriteThis wt; |
| |
| wt.readptr = data; |
| wt.sizeleft = strlen(data); |
| |
| /* In windows, this will init the winsock stuff */ |
| res = curl_global_init(CURL_GLOBAL_DEFAULT); |
| /* Check for errors */ |
| if(res != CURLE_OK) { |
| fprintf(stderr, "curl_global_init() failed: %s\n", |
| curl_easy_strerror(res)); |
| return 1; |
| } |
| |
| /* get a curl handle */ |
| curl = curl_easy_init(); |
| if(curl) { |
| /* First set the URL that is about to receive our POST. */ |
| curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/index.cgi"); |
| |
| /* Now specify we want to POST data */ |
| curl_easy_setopt(curl, CURLOPT_POST, 1L); |
| |
| /* we want to use our own read function */ |
| curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback); |
| |
| /* pointer to pass to our read function */ |
| curl_easy_setopt(curl, CURLOPT_READDATA, &wt); |
| |
| /* get verbose debug output please */ |
| curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); |
| |
| /* |
| If you use POST to a HTTP 1.1 server, you can send data without knowing |
| the size before starting the POST if you use chunked encoding. You |
| enable this by adding a header like "Transfer-Encoding: chunked" with |
| CURLOPT_HTTPHEADER. With HTTP 1.0 or without chunked transfer, you must |
| specify the size in the request. |
| */ |
| #ifdef USE_CHUNKED |
| { |
| struct curl_slist *chunk = NULL; |
| |
| chunk = curl_slist_append(chunk, "Transfer-Encoding: chunked"); |
| res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk); |
| /* use curl_slist_free_all() after the *perform() call to free this |
| list again */ |
| } |
| #else |
| /* Set the expected POST size. If you want to POST large amounts of data, |
| consider CURLOPT_POSTFIELDSIZE_LARGE */ |
| curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)wt.sizeleft); |
| #endif |
| |
| #ifdef DISABLE_EXPECT |
| /* |
| Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" |
| header. You can disable this header with CURLOPT_HTTPHEADER as usual. |
| NOTE: if you want chunked transfer too, you need to combine these two |
| since you can only set one list of headers with CURLOPT_HTTPHEADER. */ |
| |
| /* A less good option would be to enforce HTTP 1.0, but that might also |
| have other implications. */ |
| { |
| struct curl_slist *chunk = NULL; |
| |
| chunk = curl_slist_append(chunk, "Expect:"); |
| res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk); |
| /* use curl_slist_free_all() after the *perform() call to free this |
| list again */ |
| } |
| #endif |
| |
| /* 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)); |
| |
| /* always cleanup */ |
| curl_easy_cleanup(curl); |
| } |
| curl_global_cleanup(); |
| return 0; |
| } |