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Filename :
imap-tls.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> * IMAP example using TLS * </DESC> */ #include <stdio.h> #include <curl/curl.h> /* This is a simple example showing how to fetch mail using libcurl's IMAP * capabilities. It builds on the imap-fetch.c example adding transport * security to protect the authentication details from being snooped. * * Note that this example requires libcurl 7.30.0 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 fetch message 1 from the user's inbox */ curl_easy_setopt(curl, CURLOPT_URL, "imap://imap.example.com/INBOX/;UID=1"); /* In this example, we'll start with a plain text connection, and upgrade * to Transport Layer Security (TLS) using the STARTTLS command. Be careful * of using CURLUSESSL_TRY here, because if TLS upgrade fails, the transfer * will continue anyway - see the security discussion in the libcurl * tutorial for more details. */ curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL); /* If your server doesn't have a valid certificate, then you can disable * part of the Transport Layer Security protection by setting the * CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST options to 0 (false). * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L); * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); * * That is, in general, a bad idea. It is still better than sending your * authentication details in plain text though. Instead, you should get * the issuer certificate (or the host certificate if the certificate is * self-signed) and add it to the set of certificates that are known to * libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH. See docs/SSLCERTS * for more information. */ curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem"); /* 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 fetch */ 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; }