Annotation of embedaddon/curl/docs/examples/smtp-tls.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: * SMTP example using TLS
! 25: * </DESC>
! 26: */
! 27:
! 28: #include <stdio.h>
! 29: #include <string.h>
! 30: #include <curl/curl.h>
! 31:
! 32: /* This is a simple example showing how to send mail using libcurl's SMTP
! 33: * capabilities. It builds on the smtp-mail.c example to add authentication
! 34: * and, more importantly, transport security to protect the authentication
! 35: * details from being snooped.
! 36: *
! 37: * Note that this example requires libcurl 7.20.0 or above.
! 38: */
! 39:
! 40: #define FROM "<sender@example.org>"
! 41: #define TO "<addressee@example.net>"
! 42: #define CC "<info@example.org>"
! 43:
! 44: static const char *payload_text[] = {
! 45: "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
! 46: "To: " TO "\r\n",
! 47: "From: " FROM " (Example User)\r\n",
! 48: "Cc: " CC " (Another example User)\r\n",
! 49: "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
! 50: "rfcpedant.example.org>\r\n",
! 51: "Subject: SMTP TLS example message\r\n",
! 52: "\r\n", /* empty line to divide headers from body, see RFC5322 */
! 53: "The body of the message starts here.\r\n",
! 54: "\r\n",
! 55: "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
! 56: "Check RFC5322.\r\n",
! 57: NULL
! 58: };
! 59:
! 60: struct upload_status {
! 61: int lines_read;
! 62: };
! 63:
! 64: static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
! 65: {
! 66: struct upload_status *upload_ctx = (struct upload_status *)userp;
! 67: const char *data;
! 68:
! 69: if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
! 70: return 0;
! 71: }
! 72:
! 73: data = payload_text[upload_ctx->lines_read];
! 74:
! 75: if(data) {
! 76: size_t len = strlen(data);
! 77: memcpy(ptr, data, len);
! 78: upload_ctx->lines_read++;
! 79:
! 80: return len;
! 81: }
! 82:
! 83: return 0;
! 84: }
! 85:
! 86: int main(void)
! 87: {
! 88: CURL *curl;
! 89: CURLcode res = CURLE_OK;
! 90: struct curl_slist *recipients = NULL;
! 91: struct upload_status upload_ctx;
! 92:
! 93: upload_ctx.lines_read = 0;
! 94:
! 95: curl = curl_easy_init();
! 96: if(curl) {
! 97: /* Set username and password */
! 98: curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
! 99: curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
! 100:
! 101: /* This is the URL for your mailserver. Note the use of port 587 here,
! 102: * instead of the normal SMTP port (25). Port 587 is commonly used for
! 103: * secure mail submission (see RFC4403), but you should use whatever
! 104: * matches your server configuration. */
! 105: curl_easy_setopt(curl, CURLOPT_URL, "smtp://mainserver.example.net:587");
! 106:
! 107: /* In this example, we'll start with a plain text connection, and upgrade
! 108: * to Transport Layer Security (TLS) using the STARTTLS command. Be careful
! 109: * of using CURLUSESSL_TRY here, because if TLS upgrade fails, the transfer
! 110: * will continue anyway - see the security discussion in the libcurl
! 111: * tutorial for more details. */
! 112: curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
! 113:
! 114: /* If your server doesn't have a valid certificate, then you can disable
! 115: * part of the Transport Layer Security protection by setting the
! 116: * CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST options to 0 (false).
! 117: * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
! 118: * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
! 119: * That is, in general, a bad idea. It is still better than sending your
! 120: * authentication details in plain text though. Instead, you should get
! 121: * the issuer certificate (or the host certificate if the certificate is
! 122: * self-signed) and add it to the set of certificates that are known to
! 123: * libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH. See docs/SSLCERTS
! 124: * for more information. */
! 125: curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem");
! 126:
! 127: /* Note that this option isn't strictly required, omitting it will result
! 128: * in libcurl sending the MAIL FROM command with empty sender data. All
! 129: * autoresponses should have an empty reverse-path, and should be directed
! 130: * to the address in the reverse-path which triggered them. Otherwise,
! 131: * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
! 132: * details.
! 133: */
! 134: curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
! 135:
! 136: /* Add two recipients, in this particular case they correspond to the
! 137: * To: and Cc: addressees in the header, but they could be any kind of
! 138: * recipient. */
! 139: recipients = curl_slist_append(recipients, TO);
! 140: recipients = curl_slist_append(recipients, CC);
! 141: curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
! 142:
! 143: /* We're using a callback function to specify the payload (the headers and
! 144: * body of the message). You could just use the CURLOPT_READDATA option to
! 145: * specify a FILE pointer to read from. */
! 146: curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
! 147: curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
! 148: curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
! 149:
! 150: /* Since the traffic will be encrypted, it is very useful to turn on debug
! 151: * information within libcurl to see what is happening during the transfer.
! 152: */
! 153: curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
! 154:
! 155: /* Send the message */
! 156: res = curl_easy_perform(curl);
! 157:
! 158: /* Check for errors */
! 159: if(res != CURLE_OK)
! 160: fprintf(stderr, "curl_easy_perform() failed: %s\n",
! 161: curl_easy_strerror(res));
! 162:
! 163: /* Free the list of recipients */
! 164: curl_slist_free_all(recipients);
! 165:
! 166: /* Always cleanup */
! 167: curl_easy_cleanup(curl);
! 168: }
! 169:
! 170: return (int)res;
! 171: }
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