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    1: /***************************************************************************
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    3:  *  Project                     ___| | | |  _ \| |
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    7:  *
    8:  * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
   13:  *
   14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   15:  * copies of the Software, and permit persons to whom the Software is
   16:  * furnished to do so, under the terms of the COPYING file.
   17:  *
   18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   19:  * KIND, either express or implied.
   20:  *
   21:  ***************************************************************************/
   22: 
   23: /* <DESC>
   24:  * Send e-mail with SMTP
   25:  * </DESC>
   26:  */
   27: 
   28: #include <stdio.h>
   29: #include <string.h>
   30: #include <curl/curl.h>
   31: 
   32: /*
   33:  * For an SMTP example using the multi interface please see smtp-multi.c.
   34:  */
   35: 
   36: /* The libcurl options want plain addresses, the viewable headers in the mail
   37:  * can very well get a full name as well.
   38:  */
   39: #define FROM_ADDR    "<sender@example.org>"
   40: #define TO_ADDR      "<addressee@example.net>"
   41: #define CC_ADDR      "<info@example.org>"
   42: 
   43: #define FROM_MAIL "Sender Person " FROM_ADDR
   44: #define TO_MAIL   "A Receiver " TO_ADDR
   45: #define CC_MAIL   "John CC Smith " CC_ADDR
   46: 
   47: static const char *payload_text[] = {
   48:   "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
   49:   "To: " TO_MAIL "\r\n",
   50:   "From: " FROM_MAIL "\r\n",
   51:   "Cc: " CC_MAIL "\r\n",
   52:   "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
   53:   "rfcpedant.example.org>\r\n",
   54:   "Subject: SMTP example message\r\n",
   55:   "\r\n", /* empty line to divide headers from body, see RFC5322 */
   56:   "The body of the message starts here.\r\n",
   57:   "\r\n",
   58:   "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
   59:   "Check RFC5322.\r\n",
   60:   NULL
   61: };
   62: 
   63: struct upload_status {
   64:   int lines_read;
   65: };
   66: 
   67: static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
   68: {
   69:   struct upload_status *upload_ctx = (struct upload_status *)userp;
   70:   const char *data;
   71: 
   72:   if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
   73:     return 0;
   74:   }
   75: 
   76:   data = payload_text[upload_ctx->lines_read];
   77: 
   78:   if(data) {
   79:     size_t len = strlen(data);
   80:     memcpy(ptr, data, len);
   81:     upload_ctx->lines_read++;
   82: 
   83:     return len;
   84:   }
   85: 
   86:   return 0;
   87: }
   88: 
   89: int main(void)
   90: {
   91:   CURL *curl;
   92:   CURLcode res = CURLE_OK;
   93:   struct curl_slist *recipients = NULL;
   94:   struct upload_status upload_ctx;
   95: 
   96:   upload_ctx.lines_read = 0;
   97: 
   98:   curl = curl_easy_init();
   99:   if(curl) {
  100:     /* This is the URL for your mailserver */
  101:     curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
  102: 
  103:     /* Note that this option isn't strictly required, omitting it will result
  104:      * in libcurl sending the MAIL FROM command with empty sender data. All
  105:      * autoresponses should have an empty reverse-path, and should be directed
  106:      * to the address in the reverse-path which triggered them. Otherwise,
  107:      * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
  108:      * details.
  109:      */
  110:     curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_ADDR);
  111: 
  112:     /* Add two recipients, in this particular case they correspond to the
  113:      * To: and Cc: addressees in the header, but they could be any kind of
  114:      * recipient. */
  115:     recipients = curl_slist_append(recipients, TO_ADDR);
  116:     recipients = curl_slist_append(recipients, CC_ADDR);
  117:     curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
  118: 
  119:     /* We're using a callback function to specify the payload (the headers and
  120:      * body of the message). You could just use the CURLOPT_READDATA option to
  121:      * specify a FILE pointer to read from. */
  122:     curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
  123:     curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
  124:     curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
  125: 
  126:     /* Send the message */
  127:     res = curl_easy_perform(curl);
  128: 
  129:     /* Check for errors */
  130:     if(res != CURLE_OK)
  131:       fprintf(stderr, "curl_easy_perform() failed: %s\n",
  132:               curl_easy_strerror(res));
  133: 
  134:     /* Free the list of recipients */
  135:     curl_slist_free_all(recipients);
  136: 
  137:     /* curl won't send the QUIT command until you call cleanup, so you should
  138:      * be able to re-use this connection for additional messages (setting
  139:      * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling
  140:      * curl_easy_perform() again. It may not be a good idea to keep the
  141:      * connection open for a very long time though (more than a few minutes
  142:      * may result in the server timing out the connection), and you do want to
  143:      * clean up in the end.
  144:      */
  145:     curl_easy_cleanup(curl);
  146:   }
  147: 
  148:   return (int)res;
  149: }