1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2014, 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 http://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 #include <stdio.h>
23 #include <string.h>
24 #include <curl/curl.h>
25 
26 /* This is a simple example showing how to expand an email mailing list.
27  *
28  * Notes:
29  *
30  * 1) This example requires libcurl 7.34.0 or above.
31  * 2) Not all email servers support this command.
32  */
33 
main(void)34 int main(void)
35 {
36   CURL *curl;
37   CURLcode res;
38   struct curl_slist *recipients = NULL;
39 
40   curl = curl_easy_init();
41   if(curl) {
42     /* This is the URL for your mailserver */
43     curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
44 
45     /* Note that the CURLOPT_MAIL_RCPT takes a list, not a char array  */
46     recipients = curl_slist_append(recipients, "Friends");
47     curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
48 
49     /* Set the EXPN command */
50     curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "EXPN");
51 
52     /* Perform the custom request */
53     res = curl_easy_perform(curl);
54 
55     /* Check for errors */
56     if(res != CURLE_OK)
57       fprintf(stderr, "curl_easy_perform() failed: %s\n",
58               curl_easy_strerror(res));
59 
60     /* Free the list of recipients */
61     curl_slist_free_all(recipients);
62 
63     /* Curl won't send the QUIT command until you call cleanup, so you should
64      * be able to re-use this connection for additional requests. It may not be
65      * a good idea to keep the connection open for a very long time though
66      * (more than a few minutes may result in the server timing out the
67      * connection) and you do want to clean up in the end.
68      */
69     curl_easy_cleanup(curl);
70   }
71 
72   return 0;
73 }
74