imap-tls.c 3.5 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394
  1. /***************************************************************************
  2. * _ _ ____ _
  3. * Project ___| | | | _ \| |
  4. * / __| | | | |_) | |
  5. * | (__| |_| | _ <| |___
  6. * \___|\___/|_| \_\_____|
  7. *
  8. * Copyright (C) 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.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. * SPDX-License-Identifier: curl
  22. *
  23. ***************************************************************************/
  24. /* <DESC>
  25. * IMAP using TLS
  26. * </DESC>
  27. */
  28. #include <stdio.h>
  29. #include <curl/curl.h>
  30. /* This is a simple example showing how to fetch mail using libcurl's IMAP
  31. * capabilities. It builds on the imap-fetch.c example adding transport
  32. * security to protect the authentication details from being snooped.
  33. *
  34. * Note that this example requires libcurl 7.30.0 or above.
  35. */
  36. int main(void)
  37. {
  38. CURL *curl;
  39. CURLcode res = CURLE_OK;
  40. curl = curl_easy_init();
  41. if(curl) {
  42. /* Set username and password */
  43. curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
  44. curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
  45. /* This fetches message 1 from the user's inbox */
  46. curl_easy_setopt(curl, CURLOPT_URL,
  47. "imap://imap.example.com/INBOX/;UID=1");
  48. /* In this example, we start with a plain text connection, and upgrade to
  49. * Transport Layer Security (TLS) using the STARTTLS command. Be careful
  50. * of using CURLUSESSL_TRY here, because if TLS upgrade fails, the
  51. * transfer continues anyway - see the security discussion in the libcurl
  52. * tutorial for more details. */
  53. curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
  54. /* If your server does not have a valid certificate, then you can disable
  55. * part of the Transport Layer Security protection by setting the
  56. * CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST options to 0 (false).
  57. * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
  58. * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
  59. *
  60. * That is, in general, a bad idea. It is still better than sending your
  61. * authentication details in plain text though. Instead, you should get
  62. * the issuer certificate (or the host certificate if the certificate is
  63. * self-signed) and add it to the set of certificates that are known to
  64. * libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH. See docs/SSLCERTS
  65. * for more information. */
  66. curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem");
  67. /* Since the traffic is encrypted, it is useful to turn on debug
  68. * information within libcurl to see what is happening during the
  69. * transfer */
  70. curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
  71. /* Perform the fetch */
  72. res = curl_easy_perform(curl);
  73. /* Check for errors */
  74. if(res != CURLE_OK)
  75. fprintf(stderr, "curl_easy_perform() failed: %s\n",
  76. curl_easy_strerror(res));
  77. /* Always cleanup */
  78. curl_easy_cleanup(curl);
  79. }
  80. return (int)res;
  81. }