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Annotation of embedaddon/curl/docs/examples/pop3-tls.c, revision 1.1.1.1

1.1       misho       1: /***************************************************************************
                      2:  *                                  _   _ ____  _
                      3:  *  Project                     ___| | | |  _ \| |
                      4:  *                             / __| | | | |_) | |
                      5:  *                            | (__| |_| |  _ <| |___
                      6:  *                             \___|\___/|_| \_\_____|
                      7:  *
                      8:  * Copyright (C) 1998 - 2016, 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:  * POP3 example using TLS
                     25:  * </DESC>
                     26:  */
                     27: 
                     28: #include <stdio.h>
                     29: #include <curl/curl.h>
                     30: 
                     31: /* This is a simple example showing how to retrieve mail using libcurl's POP3
                     32:  * capabilities. It builds on the pop3-retr.c example adding transport
                     33:  * security to protect the authentication details from being snooped.
                     34:  *
                     35:  * Note that this example requires libcurl 7.20.0 or above.
                     36:  */
                     37: 
                     38: int main(void)
                     39: {
                     40:   CURL *curl;
                     41:   CURLcode res = CURLE_OK;
                     42: 
                     43:   curl = curl_easy_init();
                     44:   if(curl) {
                     45:     /* Set username and password */
                     46:     curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
                     47:     curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
                     48: 
                     49:     /* This will retrieve message 1 from the user's mailbox */
                     50:     curl_easy_setopt(curl, CURLOPT_URL, "pop3://pop.example.com/1");
                     51: 
                     52:     /* In this example, we'll start with a plain text connection, and upgrade
                     53:      * to Transport Layer Security (TLS) using the STLS command. Be careful of
                     54:      * using CURLUSESSL_TRY here, because if TLS upgrade fails, the transfer
                     55:      * will continue anyway - see the security discussion in the libcurl
                     56:      * tutorial for more details. */
                     57:     curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
                     58: 
                     59:     /* If your server doesn't have a valid certificate, then you can disable
                     60:      * part of the Transport Layer Security protection by setting the
                     61:      * CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST options to 0 (false).
                     62:      *   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
                     63:      *   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
                     64:      *
                     65:      * That is, in general, a bad idea. It is still better than sending your
                     66:      * authentication details in plain text though.  Instead, you should get
                     67:      * the issuer certificate (or the host certificate if the certificate is
                     68:      * self-signed) and add it to the set of certificates that are known to
                     69:      * libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH. See docs/SSLCERTS
                     70:      * for more information. */
                     71:     curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem");
                     72: 
                     73:     /* Since the traffic will be encrypted, it is very useful to turn on debug
                     74:      * information within libcurl to see what is happening during the
                     75:      * transfer */
                     76:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
                     77: 
                     78:     /* Perform the retr */
                     79:     res = curl_easy_perform(curl);
                     80: 
                     81:     /* Check for errors */
                     82:     if(res != CURLE_OK)
                     83:       fprintf(stderr, "curl_easy_perform() failed: %s\n",
                     84:               curl_easy_strerror(res));
                     85: 
                     86:     /* Always cleanup */
                     87:     curl_easy_cleanup(curl);
                     88:   }
                     89: 
                     90:   return (int)res;
                     91: }