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Annotation of embedaddon/curl/docs/examples/smtp-mail.c, revision 1.1.1.1

1.1       misho       1: /***************************************************************************
                      2:  *                                  _   _ ____  _
                      3:  *  Project                     ___| | | |  _ \| |
                      4:  *                             / __| | | | |_) | |
                      5:  *                            | (__| |_| |  _ <| |___
                      6:  *                             \___|\___/|_| \_\_____|
                      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: }