diff options
Diffstat (limited to 'docs/examples/smtp-multi.c')
-rw-r--r-- | docs/examples/smtp-multi.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/docs/examples/smtp-multi.c b/docs/examples/smtp-multi.c new file mode 100644 index 00000000..4098c7d1 --- /dev/null +++ b/docs/examples/smtp-multi.c @@ -0,0 +1,237 @@ +/*************************************************************************** + * _ _ ____ _ + * 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 <string.h> +#include <curl/curl.h> + +/* This is an example showing how to send mail using libcurl's SMTP + * capabilities. It builds on the smtp-mail.c example to demonstrate how to use + * libcurl's multi interface. + * + * Note that this example requires libcurl 7.20.0 or above. + */ + +#define FROM "<sender@example.com>" +#define TO "<recipient@example.com>" +#define CC "<info@example.com>" + +#define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000 + +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 multi 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; +} + +static struct timeval tvnow(void) +{ + struct timeval now; + + /* time() returns the value of time in seconds since the epoch */ + now.tv_sec = (long)time(NULL); + now.tv_usec = 0; + + return now; +} + +static long tvdiff(struct timeval newer, struct timeval older) +{ + return (newer.tv_sec - older.tv_sec) * 1000 + + (newer.tv_usec - older.tv_usec) / 1000; +} + +int main(void) +{ + CURL *curl; + CURLM *mcurl; + int still_running = 1; + struct timeval mp_start; + struct curl_slist *recipients = NULL; + struct upload_status upload_ctx; + + upload_ctx.lines_read = 0; + + curl_global_init(CURL_GLOBAL_DEFAULT); + + curl = curl_easy_init(); + if(!curl) + return 1; + + mcurl = curl_multi_init(); + if(!mcurl) + return 2; + + /* This is the URL for your mailserver */ + curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com"); + + /* 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); + + /* 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); + + /* 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); + + /* Tell the multi stack about our easy handle */ + curl_multi_add_handle(mcurl, curl); + + /* Record the start time which we can use later */ + mp_start = tvnow(); + + /* We start some action by calling perform right away */ + curl_multi_perform(mcurl, &still_running); + + while(still_running) { + struct timeval timeout; + fd_set fdread; + fd_set fdwrite; + fd_set fdexcep; + int maxfd = -1; + int rc; + CURLMcode mc; /* curl_multi_fdset() return code */ + + long curl_timeo = -1; + + /* Initialise the file descriptors */ + FD_ZERO(&fdread); + FD_ZERO(&fdwrite); + FD_ZERO(&fdexcep); + + /* Set a suitable timeout to play around with */ + timeout.tv_sec = 1; + timeout.tv_usec = 0; + + curl_multi_timeout(mcurl, &curl_timeo); + if(curl_timeo >= 0) { + timeout.tv_sec = curl_timeo / 1000; + if(timeout.tv_sec > 1) + timeout.tv_sec = 1; + else + timeout.tv_usec = (curl_timeo % 1000) * 1000; + } + + /* get file descriptors from the transfers */ + mc = curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd); + + if(mc != CURLM_OK) + { + fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); + break; + } + + /* On success the value of maxfd is guaranteed to be >= -1. We call + select(maxfd + 1, ...); specially in case of (maxfd == -1) there are + no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- + to sleep 100ms, which is the minimum suggested value in the + curl_multi_fdset() doc. */ + + if(maxfd == -1) { +#ifdef _WIN32 + Sleep(100); + rc = 0; +#else + /* Portable sleep for platforms other than Windows. */ + struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ + rc = select(0, NULL, NULL, NULL, &wait); +#endif + } + else { + /* Note that on some platforms 'timeout' may be modified by select(). + If you need access to the original value save a copy beforehand. */ + rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); + } + + if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) { + fprintf(stderr, + "ABORTING: Since it seems that we would have run forever.\n"); + break; + } + + switch(rc) { + case -1: /* select error */ + break; + case 0: /* timeout */ + default: /* action */ + curl_multi_perform(mcurl, &still_running); + break; + } + } + + /* Free the list of recipients */ + curl_slist_free_all(recipients); + + /* Always cleanup */ + curl_multi_remove_handle(mcurl, curl); + curl_multi_cleanup(mcurl); + curl_easy_cleanup(curl); + curl_global_cleanup(); + + return 0; +} |