text: /*
   * Copyright (C) 2012-2013 Michael Tuexen
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the project nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.	IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  /*
   * Usage: daytime_server [local_encaps_port] [remote_encaps_port]
   * 
   * Example
   * Server: $ ./daytime_server 11111 22222
   * Client: $ ./client 127.0.0.1 13 0 22222 11111
   */
  
  #ifdef _WIN32
  #define _CRT_SECURE_NO_WARNINGS
  #endif
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdarg.h>
  #include <sys/types.h>
  #include <time.h>
  #ifndef _WIN32
  #include <unistd.h>
  #include <sys/socket.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  #endif
  #include <usrsctp.h>
  
  #define PORT 13
  #define DAYTIME_PPID 40
  #define SLEEP 1
  
  void
  debug_printf(const char *format, ...)
  {
  	va_list ap;
  
  	va_start(ap, format);
  	vprintf(format, ap);
  	va_end(ap);
  }
  
  int
  main(int argc, char *argv[])
  {
  	struct socket *sock, *conn_sock;
  	struct sockaddr_in addr;
  	struct sctp_udpencaps encaps;
  	socklen_t addr_len;
  	char buffer[80];
  	time_t now;
  	struct sctp_sndinfo sndinfo;
  
  	if (argc > 1) {
  		usrsctp_init(atoi(argv[1]), NULL, debug_printf);
  	} else {
  		usrsctp_init(9899, NULL, debug_printf);
  	}
  #ifdef SCTP_DEBUG
  	usrsctp_sysctl_set_sctp_debug_on(SCTP_DEBUG_NONE);
  #endif
  	usrsctp_sysctl_set_sctp_blackhole(2);
  
  	if ((sock = usrsctp_socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP, NULL, NULL, 0, NULL)) == NULL) {
  		perror("usrsctp_socket");
  	}
  	if (argc > 2) {
  		memset(&encaps, 0, sizeof(struct sctp_udpencaps));
  		encaps.sue_address.ss_family = AF_INET;
  		encaps.sue_port = htons(atoi(argv[2]));
  		if (usrsctp_setsockopt(sock, IPPROTO_SCTP, SCTP_REMOTE_UDP_ENCAPS_PORT, (const void*)&encaps, (socklen_t)sizeof(struct sctp_udpencaps)) < 0) {
  			perror("setsockopt");
  		}
  	}
  	memset((void *)&addr, 0, sizeof(struct sockaddr_in));
  #ifdef HAVE_SIN_LEN
  	addr.sin_len = sizeof(struct sockaddr_in);
  #endif
  	addr.sin_family = AF_INET;
  	addr.sin_port = htons(PORT);
  	addr.sin_addr.s_addr = htonl(INADDR_ANY);
  	if (usrsctp_bind(sock, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) < 0) {
  		perror("usrsctp_bind");
  	}
  	if (usrsctp_listen(sock, 1) < 0) {
  		perror("usrsctp_listen");
  	}
  	while (1) {
  		addr_len = 0;
  		if ((conn_sock = usrsctp_accept(sock, NULL, &addr_len)) == NULL) {
  			continue;
  		}
  		time(&now);
  #ifdef _WIN32
  		_snprintf(buffer, sizeof(buffer), "%s", ctime(&now));
  #else
  		snprintf(buffer, sizeof(buffer), "%s", ctime(&now));
  #endif
  		sndinfo.snd_sid = 0;
  		sndinfo.snd_flags = 0;
  		sndinfo.snd_ppid = htonl(DAYTIME_PPID);
  		sndinfo.snd_context = 0;
  		sndinfo.snd_assoc_id = 0;
  		if (usrsctp_sendv(conn_sock, buffer, strlen(buffer), NULL, 0, (void *)&sndinfo,
  		                  (socklen_t)sizeof(struct sctp_sndinfo), SCTP_SENDV_SNDINFO, 0) < 0) {
  			perror("usrsctp_sendv");
  		}
  		usrsctp_close(conn_sock);
  	}
  	usrsctp_close(sock);
  	while (usrsctp_finish() != 0) {
  #ifdef _WIN32
  		Sleep(SLEEP * 1000);
  #else
  		sleep(SLEEP);
  #endif
  	}
  	return (0);
  }
  