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Annotation of embedaddon/curl/docs/examples/pop3-ssl.c, revision 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:  * 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: }