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pop3-ssl.c
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/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ /* <DESC> * POP3 example using SSL * </DESC> */ #include <stdio.h> #include <curl/curl.h> /* This is a simple example showing how to retrieve mail using libcurl's POP3 * capabilities. It builds on the pop3-retr.c example adding transport * security to protect the authentication details from being snooped. * * Note that this example requires libcurl 7.20.0 or above. */ int main(void) { CURL *curl; CURLcode res = CURLE_OK; curl = curl_easy_init(); if(curl) { /* Set username and password */ curl_easy_setopt(curl, CURLOPT_USERNAME, "user"); curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret"); /* This will retrieve message 1 from the user's mailbox. Note the use of * pop3s:// rather than pop3:// to request a SSL based connection. */ curl_easy_setopt(curl, CURLOPT_URL, "pop3s://pop.example.com/1"); /* If you want to connect to a site who isn't using a certificate that is * signed by one of the certs in the CA bundle you have, you can skip the * verification of the server's certificate. This makes the connection * A LOT LESS SECURE. * * If you have a CA cert for the server stored someplace else than in the * default bundle, then the CURLOPT_CAPATH option might come handy for * you. */ #ifdef SKIP_PEER_VERIFICATION curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L); #endif /* If the site you're connecting to uses a different host name that what * they have mentioned in their server certificate's commonName (or * subjectAltName) fields, libcurl will refuse to connect. You can skip * this check, but this will make the connection less secure. */ #ifdef SKIP_HOSTNAME_VERIFICATION curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); #endif /* Since the traffic will be encrypted, it is very useful to turn on debug * information within libcurl to see what is happening during the * transfer */ curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); /* Perform the retr */ res = curl_easy_perform(curl); /* Check for errors */ if(res != CURLE_OK) fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res)); /* Always cleanup */ curl_easy_cleanup(curl); } return (int)res; }