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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2014, 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 http://curl.haxx.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.
+ *
+ ***************************************************************************/
+#include <stdio.h>
+#include <string.h>
+#include <curl/curl.h>
+
+/* This is a simple example showing how to send mail using libcurl's SMTP
+ * capabilities. It builds on the smtp-send.c example to add authentication
+ * and, more importantly, transport security to protect the authentication
+ * details from being snooped.
+ */
+
+#define FROM "<sender@example.org>"
+#define TO "<addressee@example.net>"
+#define CC "<info@example.org>"
+
+static const char *payload_text[] = {
+ "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
+ "To: " TO "\r\n",
+ "From: " FROM "(Example User)\r\n",
+ "Cc: " CC "(Another example User)\r\n",
+ "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@rfcpedant.example.org>\r\n",
+ "Subject: SMTP TLS example message\r\n",
+ "\r\n", /* empty line to divide headers from body, see RFC5322 */
+ "The body of the message starts here.\r\n",
+ "\r\n",
+ "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
+ "Check RFC5322.\r\n",
+ NULL
+};
+
+struct upload_status {
+ int lines_read;
+};
+
+static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
+{
+ struct upload_status *upload_ctx = (struct upload_status *)userp;
+ const char *data;
+
+ if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
+ return 0;
+ }
+
+ data = payload_text[upload_ctx->lines_read];
+
+ if(data) {
+ size_t len = strlen(data);
+ memcpy(ptr, data, len);
+ upload_ctx->lines_read++;
+
+ return len;
+ }
+
+ return 0;
+}
+
+int main(void)
+{
+ CURL *curl;
+ CURLcode res = CURLE_OK;
+ struct curl_slist *recipients = NULL;
+ struct upload_status upload_ctx;
+
+ upload_ctx.lines_read = 0;
+
+ 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 is the URL for your mailserver. Note the use of smtps:// rather
+ * than smtp:// to request a SSL based connection. */
+ curl_easy_setopt(curl, CURLOPT_URL, "smtps://mainserver.example.net");
+
+ /* 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_VERFICATION
+ curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
+#endif
+
+ /* Value for envelope reverse-path */
+ curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
+
+ /* Add two recipients, in this particular case they correspond to the
+ * To: and Cc: addressees in the header, but they could be any kind of
+ * recipient. */
+ recipients = curl_slist_append(recipients, TO);
+ recipients = curl_slist_append(recipients, CC);
+ curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
+
+ /* In this case, we're using a callback function to specify the data. You
+ * could just use the CURLOPT_READDATA option to specify a FILE pointer to
+ * read from. */
+ curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
+ curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
+ curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+
+ /* 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);
+
+ /* Send the message */
+ res = curl_easy_perform(curl);
+
+ /* Check for errors */
+ if(res != CURLE_OK)
+ fprintf(stderr, "curl_easy_perform() failed: %s\n",
+ curl_easy_strerror(res));
+
+ /* Free the list of recipients */
+ curl_slist_free_all(recipients);
+
+ /* Always cleanup */
+ curl_easy_cleanup(curl);
+ }
+
+ return (int)res;
+}