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    8:  * Copyright (C) 1998 - 2019, 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.
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   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 on behalf of another user with SMTP
   25:  * </DESC>
   26:  */
   27: 
   28: #include <stdio.h>
   29: #include <string.h>
   30: #include <curl/curl.h>
   31: 
   32: /*
   33:  * This is a simple example show how to send an email using libcurl's SMTP
   34:  * capabilities.
   35:  *
   36:  * Note that this example requires libcurl 7.66.0 or above.
   37:  */
   38: 
   39: /* The libcurl options want plain addresses, the viewable headers in the mail
   40:  * can very well get a full name as well.
   41:  */
   42: #define FROM_ADDR    "<ursel@example.org>"
   43: #define SENDER_ADDR  "<kurt@example.org>"
   44: #define TO_ADDR      "<addressee@example.net>"
   45: 
   46: #define FROM_MAIL    "Ursel " FROM_ADDR
   47: #define SENDER_MAIL  "Kurt " SENDER_ADDR
   48: #define TO_MAIL      "A Receiver " TO_ADDR
   49: 
   50: static const char *payload_text[] = {
   51:   "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
   52:   "To: " TO_MAIL "\r\n",
   53:   "From: " FROM_MAIL "\r\n",
   54:   "Sender: " SENDER_MAIL "\r\n",
   55:   "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
   56:   "rfcpedant.example.org>\r\n",
   57:   "Subject: SMTP example message\r\n",
   58:   "\r\n", /* empty line to divide headers from body, see RFC5322 */
   59:   "The body of the message starts here.\r\n",
   60:   "\r\n",
   61:   "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
   62:   "Check RFC5322.\r\n",
   63:   NULL
   64: };
   65: 
   66: struct upload_status {
   67:   int lines_read;
   68: };
   69: 
   70: static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
   71: {
   72:   struct upload_status *upload_ctx = (struct upload_status *)userp;
   73:   const char *data;
   74: 
   75:   if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
   76:     return 0;
   77:   }
   78: 
   79:   data = payload_text[upload_ctx->lines_read];
   80: 
   81:   if(data) {
   82:     size_t len = strlen(data);
   83:     memcpy(ptr, data, len);
   84:     upload_ctx->lines_read++;
   85: 
   86:     return len;
   87:   }
   88: 
   89:   return 0;
   90: }
   91: 
   92: int main(void)
   93: {
   94:   CURL *curl;
   95:   CURLcode res = CURLE_OK;
   96:   struct curl_slist *recipients = NULL;
   97:   struct upload_status upload_ctx;
   98: 
   99:   upload_ctx.lines_read = 0;
  100: 
  101:   curl = curl_easy_init();
  102:   if(curl) {
  103:     /* This is the URL for your mailserver. In this example we connect to the
  104:        smtp-submission port as we require an authenticated connection. */
  105:     curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com:587");
  106: 
  107:     /* Set the username and password */
  108:     curl_easy_setopt(curl, CURLOPT_USERNAME, "kurt");
  109:     curl_easy_setopt(curl, CURLOPT_PASSWORD, "xipj3plmq");
  110: 
  111:     /* Set the authorisation identity (identity to act as) */
  112:     curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "ursel");
  113: 
  114:     /* Force PLAIN authentication */
  115:     curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=PLAIN");
  116: 
  117:     /* Note that this option isn't strictly required, omitting it will result
  118:      * in libcurl sending the MAIL FROM command with empty sender data. All
  119:      * autoresponses should have an empty reverse-path, and should be directed
  120:      * to the address in the reverse-path which triggered them. Otherwise,
  121:      * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
  122:      * details.
  123:      */
  124:     curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_ADDR);
  125: 
  126:     /* Add a recipient, in this particular case it corresponds to the
  127:      * To: addressee in the header. */
  128:     recipients = curl_slist_append(recipients, TO_ADDR);
  129:     curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
  130: 
  131:     /* We're using a callback function to specify the payload (the headers and
  132:      * body of the message). You could just use the CURLOPT_READDATA option to
  133:      * specify a FILE pointer to read from. */
  134:     curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
  135:     curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
  136:     curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
  137: 
  138:     /* Send the message */
  139:     res = curl_easy_perform(curl);
  140: 
  141:     /* Check for errors */
  142:     if(res != CURLE_OK)
  143:       fprintf(stderr, "curl_easy_perform() failed: %s\n",
  144:               curl_easy_strerror(res));
  145: 
  146:     /* Free the list of recipients */
  147:     curl_slist_free_all(recipients);
  148: 
  149:     /* curl won't send the QUIT command until you call cleanup, so you should
  150:      * be able to re-use this connection for additional messages (setting
  151:      * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling
  152:      * curl_easy_perform() again. It may not be a good idea to keep the
  153:      * connection open for a very long time though (more than a few minutes
  154:      * may result in the server timing out the connection), and you do want to
  155:      * clean up in the end.
  156:      */
  157:     curl_easy_cleanup(curl);
  158:   }
  159: 
  160:   return (int)res;
  161: }