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    1: /***************************************************************************
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    3:  *  Project                     ___| | | |  _ \| |
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    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:  * POP3 example using SSL
   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. Note the use of
   50:      * pop3s:// rather than pop3:// to request a SSL based connection. */
   51:     curl_easy_setopt(curl, CURLOPT_URL, "pop3s://pop.example.com/1");
   52: 
   53:     /* If you want to connect to a site who isn't using a certificate that is
   54:      * signed by one of the certs in the CA bundle you have, you can skip the
   55:      * verification of the server's certificate. This makes the connection
   56:      * A LOT LESS SECURE.
   57:      *
   58:      * If you have a CA cert for the server stored someplace else than in the
   59:      * default bundle, then the CURLOPT_CAPATH option might come handy for
   60:      * you. */
   61: #ifdef SKIP_PEER_VERIFICATION
   62:     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
   63: #endif
   64: 
   65:     /* If the site you're connecting to uses a different host name that what
   66:      * they have mentioned in their server certificate's commonName (or
   67:      * subjectAltName) fields, libcurl will refuse to connect. You can skip
   68:      * this check, but this will make the connection less secure. */
   69: #ifdef SKIP_HOSTNAME_VERIFICATION
   70:     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
   71: #endif
   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: }