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Diffstat (limited to 'docs/examples/smtp-authzid.c')
| -rw-r--r-- | docs/examples/smtp-authzid.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/docs/examples/smtp-authzid.c b/docs/examples/smtp-authzid.c new file mode 100644 index 000000000..decdb719d --- /dev/null +++ b/docs/examples/smtp-authzid.c @@ -0,0 +1,161 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2019, 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.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. + * + ***************************************************************************/ + +/* <DESC> + * Send e-mail on behalf of another user with SMTP + * </DESC> + */ + +#include <stdio.h> +#include <string.h> +#include <curl/curl.h> + +/* + * This is a simple example show how to send an email using libcurl's SMTP + * capabilities. + * + * Note that this example requires libcurl 7.66.0 or above. + */ + +/* The libcurl options want plain addresses, the viewable headers in the mail + * can very well get a full name as well. + */ +#define FROM_ADDR "<ursel@example.org>" +#define SENDER_ADDR "<kurt@example.org>" +#define TO_ADDR "<addressee@example.net>" + +#define FROM_MAIL "Ursel " FROM_ADDR +#define SENDER_MAIL "Kurt " SENDER_ADDR +#define TO_MAIL "A Receiver " TO_ADDR + +static const char *payload_text[] = { + "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n", + "To: " TO_MAIL "\r\n", + "From: " FROM_MAIL "\r\n", + "Sender: " SENDER_MAIL "\r\n", + "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@" + "rfcpedant.example.org>\r\n", + "Subject: SMTP 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) { + /* This is the URL for your mailserver. In this example we connect to the + smtp-submission port as we require an authenticated connection. */ + curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com:587"); + + /* Set the username and password */ + curl_easy_setopt(curl, CURLOPT_USERNAME, "kurt"); + curl_easy_setopt(curl, CURLOPT_PASSWORD, "xipj3plmq"); + + /* Set the authorisation identity (identity to act as) */ + curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "ursel"); + + /* Force PLAIN authentication */ + curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=PLAIN"); + + /* Note that this option isn't strictly required, omitting it will result + * in libcurl sending the MAIL FROM command with empty sender data. All + * autoresponses should have an empty reverse-path, and should be directed + * to the address in the reverse-path which triggered them. Otherwise, + * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more + * details. + */ + curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_ADDR); + + /* Add a recipient, in this particular case it corresponds to the + * To: addressee in the header. */ + recipients = curl_slist_append(recipients, TO_ADDR); + curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients); + + /* We're using a callback function to specify the payload (the headers and + * body of the message). 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); + + /* 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); + + /* curl won't send the QUIT command until you call cleanup, so you should + * be able to re-use this connection for additional messages (setting + * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling + * curl_easy_perform() again. It may not be a good idea to keep the + * connection open for a very long time though (more than a few minutes + * may result in the server timing out the connection), and you do want to + * clean up in the end. + */ + curl_easy_cleanup(curl); + } + + return (int)res; +} |