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- /***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 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.
- *
- * SPDX-License-Identifier: curl
- *
- ***************************************************************************/
- /* <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(char *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 inits 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 an 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 gets 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;
- }
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