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