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deps/curl/docs/examples/smtp-multi.c

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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>
+ * Send SMTP email with the multi interface
+ * </DESC>
+ */
+
+#include <string.h>
+#include <curl/curl.h>
+
+/* This is an example showing how to send mail using libcurl's SMTP
+ * capabilities. It builds on the smtp-mail.c example to demonstrate how to use
+ * libcurl's multi interface.
+ */
+
+#define FROM_MAIL     "<sender@example.com>"
+#define TO_MAIL       "<recipient@example.com>"
+#define CC_MAIL       "<info@example.com>"
+
+static const char *payload_text =
+  "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n"
+  "To: " TO_MAIL "\r\n"
+  "From: " FROM_MAIL "\r\n"
+  "Cc: " CC_MAIL "\r\n"
+  "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
+  "rfcpedant.example.org>\r\n"
+  "Subject: SMTP example message\r\n"
+  "\r\n" /* empty line to divide headers from body, see RFC 5322 */
+  "The body of the message starts here.\r\n"
+  "\r\n"
+  "It could be a lot of lines, could be MIME encoded, whatever.\r\n"
+  "Check RFC 5322.\r\n";
+
+struct upload_status {
+  size_t bytes_read;
+};
+
+static size_t payload_source(char *ptr, size_t size, size_t nmemb, void *userp)
+{
+  struct upload_status *upload_ctx = (struct upload_status *)userp;
+  const char *data;
+  size_t room = size * nmemb;
+
+  if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
+    return 0;
+  }
+
+  data = &payload_text[upload_ctx->bytes_read];
+
+  if(data) {
+    size_t len = strlen(data);
+    if(room < len)
+      len = room;
+    memcpy(ptr, data, len);
+    upload_ctx->bytes_read += len;
+
+    return len;
+  }
+
+  return 0;
+}
+
+int main(void)
+{
+  CURL *curl;
+  CURLM *mcurl;
+  int still_running = 1;
+  struct curl_slist *recipients = NULL;
+  struct upload_status upload_ctx = { 0 };
+
+  curl_global_init(CURL_GLOBAL_DEFAULT);
+
+  curl = curl_easy_init();
+  if(!curl)
+    return 1;
+
+  mcurl = curl_multi_init();
+  if(!mcurl)
+    return 2;
+
+  /* This is the URL for your mailserver */
+  curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
+
+  /* Note that this option is not strictly required, omitting it will result in
+   * libcurl sending the MAIL FROM command with empty sender data. All
+   * autoresponses should have an empty reverse-path, and should be directed
+   * to the address in the reverse-path which triggered them. Otherwise, they
+   * could cause an endless loop. See RFC 5321 Section 4.5.5 for more details.
+   */
+  curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_MAIL);
+
+  /* Add two recipients, in this particular case they correspond to the
+   * To: and Cc: addressees in the header, but they could be any kind of
+   * recipient. */
+  recipients = curl_slist_append(recipients, TO_MAIL);
+  recipients = curl_slist_append(recipients, CC_MAIL);
+  curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
+
+  /* We are using a callback function to specify the payload (the headers and
+   * body of the message). You could just use the CURLOPT_READDATA option to
+   * specify a FILE pointer to read from. */
+  curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
+  curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
+  curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+
+  /* Tell the multi stack about our easy handle */
+  curl_multi_add_handle(mcurl, curl);
+
+  do {
+    CURLMcode mc = curl_multi_perform(mcurl, &still_running);
+
+    if(still_running)
+      /* wait for activity, timeout or "nothing" */
+      mc = curl_multi_poll(mcurl, NULL, 0, 1000, NULL);
+
+    if(mc)
+      break;
+
+  } while(still_running);
+
+  /* Free the list of recipients */
+  curl_slist_free_all(recipients);
+
+  /* Always cleanup */
+  curl_multi_remove_handle(mcurl, curl);
+  curl_multi_cleanup(mcurl);
+  curl_easy_cleanup(curl);
+  curl_global_cleanup();
+
+  return 0;
+}