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

1.1       misho       1: /***************************************************************************
                      2:  *                                  _   _ ____  _
                      3:  *  Project                     ___| | | |  _ \| |
                      4:  *                             / __| | | | |_) | |
                      5:  *                            | (__| |_| |  _ <| |___
                      6:  *                             \___|\___/|_| \_\_____|
                      7:  *
                      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.
                     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 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: }