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 <curl/curl.h>
24
25 /* This is a simple example showing how to retrieve mail using libcurl's POP3
26 * capabilities. It builds on the pop3-retr.c example adding transport
27 * security to protect the authentication details from being snooped.
28 *
29 * Note that this example requires libcurl 7.20.0 or above.
30 */
31
main(void)32 int main(void)
33 {
34 CURL *curl;
35 CURLcode res = CURLE_OK;
36
37 curl = curl_easy_init();
38 if(curl) {
39 /* Set username and password */
40 curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
41 curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
42
43 /* This will retrieve message 1 from the user's mailbox */
44 curl_easy_setopt(curl, CURLOPT_URL, "pop3://pop.example.com/1");
45
46 /* In this example, we'll start with a plain text connection, and upgrade
47 * to Transport Layer Security (TLS) using the STLS command. Be careful of
48 * using CURLUSESSL_TRY here, because if TLS upgrade fails, the transfer
49 * will continue anyway - see the security discussion in the libcurl
50 * tutorial for more details. */
51 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
52
53 /* If your server doesn't have a valid certificate, then you can disable
54 * part of the Transport Layer Security protection by setting the
55 * CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST options to 0 (false).
56 * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
57 * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
58 * That is, in general, a bad idea. It is still better than sending your
59 * authentication details in plain text though.
60 * Instead, you should get the issuer certificate (or the host certificate
61 * if the certificate is self-signed) and add it to the set of certificates
62 * that are known to libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH. See
63 * docs/SSLCERTS for more information. */
64 curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem");
65
66 /* Since the traffic will be encrypted, it is very useful to turn on debug
67 * information within libcurl to see what is happening during the
68 * transfer */
69 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
70
71 /* Perform the retr */
72 res = curl_easy_perform(curl);
73
74 /* Check for errors */
75 if(res != CURLE_OK)
76 fprintf(stderr, "curl_easy_perform() failed: %s\n",
77 curl_easy_strerror(res));
78
79 /* Always cleanup */
80 curl_easy_cleanup(curl);
81 }
82
83 return (int)res;
84 }
85