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3rd-party/curl-7.52.1/docs/examples/smtp-multi.c
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3rd-party/curl-7.52.1/docs/examples/smtp-multi.c
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/***************************************************************************
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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 - 2016, 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 https://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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/* <DESC>
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* SMTP example using the multi interface
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* </DESC>
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*/
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#include <string.h>
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#include <curl/curl.h>
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/* This is an example showing how to send mail using libcurl's SMTP
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* capabilities. It builds on the smtp-mail.c example to demonstrate how to use
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* libcurl's multi interface.
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*
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* Note that this example requires libcurl 7.20.0 or above.
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*/
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#define FROM "<sender@example.com>"
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#define TO "<recipient@example.com>"
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#define CC "<info@example.com>"
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#define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000
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static const char *payload_text[] = {
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"Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
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"To: " TO "\r\n",
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"From: " FROM "(Example User)\r\n",
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"Cc: " CC "(Another example User)\r\n",
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"Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
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"rfcpedant.example.org>\r\n",
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"Subject: SMTP multi example message\r\n",
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"\r\n", /* empty line to divide headers from body, see RFC5322 */
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"The body of the message starts here.\r\n",
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"\r\n",
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"It could be a lot of lines, could be MIME encoded, whatever.\r\n",
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"Check RFC5322.\r\n",
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NULL
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};
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struct upload_status {
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int lines_read;
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};
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static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
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{
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struct upload_status *upload_ctx = (struct upload_status *)userp;
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const char *data;
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if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
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return 0;
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}
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data = payload_text[upload_ctx->lines_read];
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if(data) {
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size_t len = strlen(data);
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memcpy(ptr, data, len);
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upload_ctx->lines_read++;
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return len;
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}
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return 0;
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}
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static struct timeval tvnow(void)
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{
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struct timeval now;
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/* time() returns the value of time in seconds since the epoch */
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now.tv_sec = (long)time(NULL);
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now.tv_usec = 0;
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return now;
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}
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static long tvdiff(struct timeval newer, struct timeval older)
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{
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return (newer.tv_sec - older.tv_sec) * 1000 +
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(newer.tv_usec - older.tv_usec) / 1000;
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}
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int main(void)
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{
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CURL *curl;
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CURLM *mcurl;
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int still_running = 1;
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struct timeval mp_start;
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struct curl_slist *recipients = NULL;
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struct upload_status upload_ctx;
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upload_ctx.lines_read = 0;
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curl_global_init(CURL_GLOBAL_DEFAULT);
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curl = curl_easy_init();
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if(!curl)
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return 1;
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mcurl = curl_multi_init();
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if(!mcurl)
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return 2;
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/* This is the URL for your mailserver */
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curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
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/* Note that this option isn't strictly required, omitting it will result in
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* libcurl sending the MAIL FROM command with empty sender data. All
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* autoresponses should have an empty reverse-path, and should be directed
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* to the address in the reverse-path which triggered them. Otherwise, they
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* could cause an endless loop. See RFC 5321 Section 4.5.5 for more details.
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*/
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curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
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/* Add two recipients, in this particular case they correspond to the
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* To: and Cc: addressees in the header, but they could be any kind of
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* recipient. */
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recipients = curl_slist_append(recipients, TO);
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recipients = curl_slist_append(recipients, CC);
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curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
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/* We're using a callback function to specify the payload (the headers and
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* body of the message). You could just use the CURLOPT_READDATA option to
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* specify a FILE pointer to read from. */
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curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
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curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
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curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
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/* Tell the multi stack about our easy handle */
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curl_multi_add_handle(mcurl, curl);
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/* Record the start time which we can use later */
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mp_start = tvnow();
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/* We start some action by calling perform right away */
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curl_multi_perform(mcurl, &still_running);
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while(still_running) {
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struct timeval timeout;
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fd_set fdread;
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fd_set fdwrite;
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fd_set fdexcep;
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int maxfd = -1;
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int rc;
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CURLMcode mc; /* curl_multi_fdset() return code */
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long curl_timeo = -1;
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/* Initialise the file descriptors */
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FD_ZERO(&fdread);
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FD_ZERO(&fdwrite);
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FD_ZERO(&fdexcep);
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/* Set a suitable timeout to play around with */
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timeout.tv_sec = 1;
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timeout.tv_usec = 0;
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curl_multi_timeout(mcurl, &curl_timeo);
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if(curl_timeo >= 0) {
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timeout.tv_sec = curl_timeo / 1000;
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if(timeout.tv_sec > 1)
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timeout.tv_sec = 1;
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else
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timeout.tv_usec = (curl_timeo % 1000) * 1000;
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}
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/* get file descriptors from the transfers */
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mc = curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd);
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if(mc != CURLM_OK) {
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fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
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break;
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}
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/* On success the value of maxfd is guaranteed to be >= -1. We call
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select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
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no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
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to sleep 100ms, which is the minimum suggested value in the
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curl_multi_fdset() doc. */
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if(maxfd == -1) {
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#ifdef _WIN32
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Sleep(100);
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rc = 0;
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#else
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/* Portable sleep for platforms other than Windows. */
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struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
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rc = select(0, NULL, NULL, NULL, &wait);
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#endif
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}
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else {
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/* Note that on some platforms 'timeout' may be modified by select().
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If you need access to the original value save a copy beforehand. */
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rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
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}
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if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
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fprintf(stderr,
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"ABORTING: Since it seems that we would have run forever.\n");
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break;
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}
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switch(rc) {
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case -1: /* select error */
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break;
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case 0: /* timeout */
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default: /* action */
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curl_multi_perform(mcurl, &still_running);
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break;
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}
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}
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/* Free the list of recipients */
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curl_slist_free_all(recipients);
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/* Always cleanup */
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curl_multi_remove_handle(mcurl, curl);
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curl_multi_cleanup(mcurl);
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curl_easy_cleanup(curl);
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curl_global_cleanup();
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return 0;
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}
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