text: /*
   * Copyright (C) 2011-2013 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.
   */
  
  #ifdef _WIN32
  #define _CRT_SECURE_NO_WARNINGS
  #endif
  #include <stdarg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdarg.h>
  #include <sys/types.h>
  #ifndef _WIN32
  #include <sys/socket.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  #include <errno.h>
  #include <pthread.h>
  #include <unistd.h>
  #else
  #include <winsock2.h>
  #include <ws2tcpip.h>
  #endif
  #include <usrsctp.h>
  #include "programs_helper.h"
  
  #define MAX_PACKET_SIZE (1<<16)
  #define LINE_LENGTH 80
  #define DISCARD_PPID 39
  
  #ifdef _WIN32
  static DWORD WINAPI
  #else
  static void *
  #endif
  handle_packets(void *arg)
  {
  #ifdef _WIN32
  	SOCKET *fdp;
  #else
  	int *fdp;
  #endif
  	ssize_t length;
  	char buf[MAX_PACKET_SIZE];
  
  #ifdef _WIN32
  	fdp = (SOCKET *)arg;
  #else
  	fdp = (int *)arg;
  #endif
  	for (;;) {
  #if defined(SCTP_KERNEL_NetBSD)
  		pthread_testcancel();
  #endif
  		length = recv(*fdp, buf, MAX_PACKET_SIZE, 0);
  		if (length > 0) {
  			usrsctp_conninput(fdp, buf, (size_t)length, 0);
  		}
  	}
  #ifdef _WIN32
  	return 0;
  #else
  	return (NULL);
  #endif
  }
  
  static int
  conn_output(void *addr, void *buffer, size_t length, uint8_t tos, uint8_t set_df)
  {
  #ifdef _WIN32
  	SOCKET *fdp;
  #else
  	int *fdp;
  #endif
  
  #ifdef _WIN32
  	fdp = (SOCKET *)addr;
  #else
  	fdp = (int *)addr;
  #endif
  #ifdef _WIN32
  	if (send(*fdp, buffer, (int)length, 0) == SOCKET_ERROR) {
  		return (WSAGetLastError());
  #else
  	if (send(*fdp, buffer, length, 0) < 0) {
  		return (errno);
  #endif
  	} else {
  		return (0);
  	}
  }
  
  static int
  receive_cb(struct socket *sock, union sctp_sockstore addr, void *data,
             size_t datalen, struct sctp_rcvinfo rcv, int flags, void *ulp_info)
  {
  	if (data) {
  		if (flags & MSG_NOTIFICATION) {
  			handle_notification((union sctp_notification *)data, datalen);
  		} else {
  			printf("Msg of length %d received via %p:%u on stream %u with SSN %u and TSN %u, PPID %u, context %u.\n",
  			       (int)datalen,
  			       addr.sconn.sconn_addr,
  			       ntohs(addr.sconn.sconn_port),
  			       rcv.rcv_sid,
  			       rcv.rcv_ssn,
  			       rcv.rcv_tsn,
  			       ntohl(rcv.rcv_ppid),
  			       rcv.rcv_context);
  		}
  		free(data);
  	} else {
  		usrsctp_deregister_address(ulp_info);
  		usrsctp_close(sock);
  	}
  	return (1);
  }
  
  int
  main(int argc, char *argv[])
  {
  	struct sockaddr_in sin;
  	struct sockaddr_conn sconn;
  	struct sctp_event event;
  	uint16_t event_types[] = {SCTP_ASSOC_CHANGE,
  	                          SCTP_PEER_ADDR_CHANGE,
  	                          SCTP_SEND_FAILED_EVENT};
  	unsigned int i;
  #ifdef _WIN32
  	SOCKET fd;
  #else
  	int fd;
  #endif
  	struct socket *s;
  #ifdef _WIN32
  	HANDLE tid;
  #else
  	pthread_t tid;
  #endif
  	struct sctp_sndinfo sndinfo;
  	char line[LINE_LENGTH];
  #ifdef _WIN32
  	WSADATA wsaData;
  #endif
  
  	if (argc < 4) {
  		printf("error: this program requires 4 arguments!\n");
  		exit(EXIT_FAILURE);
  	}
  
  #ifdef _WIN32
  	if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0) {
  		printf("WSAStartup failed\n");
  		exit(EXIT_FAILURE);
  	}
  #endif
  	usrsctp_init(0, conn_output, debug_printf_stack);
  	/* set up a connected UDP socket */
  #ifdef _WIN32
  	if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET) {
  		printf("socket() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  #else
  	if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
  		perror("socket");
  		exit(EXIT_FAILURE);
  	}
  #endif
  	memset(&sin, 0, sizeof(struct sockaddr_in));
  	sin.sin_family = AF_INET;
  #ifdef HAVE_SIN_LEN
  	sin.sin_len = sizeof(struct sockaddr_in);
  #endif
  	sin.sin_port = htons(atoi(argv[2]));
  	if (!inet_pton(AF_INET, argv[1], &sin.sin_addr.s_addr)){
  		printf("error: invalid address\n");
  		exit(EXIT_FAILURE);
  	}
  #ifdef _WIN32
  	if (bind(fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) == SOCKET_ERROR) {
  		printf("bind() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  #else
  	if (bind(fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) < 0) {
  		perror("bind");
  		exit(EXIT_FAILURE);
  	}
  #endif
  	memset(&sin, 0, sizeof(struct sockaddr_in));
  	sin.sin_family = AF_INET;
  #ifdef HAVE_SIN_LEN
  	sin.sin_len = sizeof(struct sockaddr_in);
  #endif
  	sin.sin_port = htons(atoi(argv[4]));
  	if (!inet_pton(AF_INET, argv[3], &sin.sin_addr.s_addr)){
  		printf("error: invalid address\n");
  		exit(EXIT_FAILURE);
  	}
  #ifdef _WIN32
  	if (connect(fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) == SOCKET_ERROR) {
  		printf("connect() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  #else
  	if (connect(fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) < 0) {
  		perror("connect");
  		exit(EXIT_FAILURE);
  	}
  #endif
  #ifdef _WIN32
  	tid = CreateThread(NULL, 0, &handle_packets, (void *)&fd, 0, NULL);
  #else
  	pthread_create(&tid, NULL, &handle_packets, (void *)&fd);
  #endif
  #ifdef SCTP_DEBUG
  	usrsctp_sysctl_set_sctp_debug_on(SCTP_DEBUG_NONE);
  #endif
  	usrsctp_register_address((void *)&fd);
  	usrsctp_sysctl_set_sctp_ecn_enable(0);
  	if ((s = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, receive_cb, NULL, 0, &fd)) == NULL) {
  		perror("usrsctp_socket");
  	}
  	/* Enable the events of interest. */
  	if (usrsctp_set_non_blocking(s, 1) < 0) {
  		perror("usrsctp_set_non_blocking");
  	}
  	memset(&event, 0, sizeof(event));
  	event.se_assoc_id = SCTP_ALL_ASSOC;
  	event.se_on = 1;
  	for (i = 0; i < sizeof(event_types)/sizeof(uint16_t); i++) {
  		event.se_type = event_types[i];
  		if (usrsctp_setsockopt(s, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(event)) < 0) {
  			perror("setsockopt SCTP_EVENT");
  		}
  	}
  	memset(&sconn, 0, sizeof(struct sockaddr_conn));
  	sconn.sconn_family = AF_CONN;
  #ifdef HAVE_SCONN_LEN
  	sconn.sconn_len = sizeof(struct sockaddr_conn);
  #endif
  	sconn.sconn_port = htons(atoi(argv[5]));
  	sconn.sconn_addr = &fd;
  	if (usrsctp_bind(s, (struct sockaddr *)&sconn, sizeof(struct sockaddr_conn)) < 0) {
  		perror("usrsctp_bind");
  	}
  	memset(&sconn, 0, sizeof(struct sockaddr_conn));
  	sconn.sconn_family = AF_CONN;
  #ifdef HAVE_SCONN_LEN
  	sconn.sconn_len = sizeof(struct sockaddr_conn);
  #endif
  	sconn.sconn_port = htons(atoi(argv[6]));
  	sconn.sconn_addr = &fd;
  	if (usrsctp_connect(s, (struct sockaddr *)&sconn, sizeof(struct sockaddr_conn)) < 0) {
  		perror("usrsctp_connect");
  	}
  	for (;;) {
  #if defined(_WIN32) && !defined(__MINGW32__)
  		if (gets_s(line, LINE_LENGTH) == NULL) {
  #else
  		if (fgets(line, LINE_LENGTH, stdin) == NULL) {
  #endif
  			if (usrsctp_shutdown(s, SHUT_WR) < 0) {
  				perror("usrsctp_shutdown");
  			}
  			while (usrsctp_finish() != 0) {
  #ifdef _WIN32
  				Sleep(1000);
  #else
  				sleep(1);
  #endif
  			}
  			break;
  		}
  		sndinfo.snd_sid = 1;
  		sndinfo.snd_flags = 0;
  		sndinfo.snd_ppid = htonl(DISCARD_PPID);
  		sndinfo.snd_context = 0;
  		sndinfo.snd_assoc_id = 0;
  		if (usrsctp_sendv(s, line, strlen(line), NULL, 0, (void *)&sndinfo,
  	                          (socklen_t)sizeof(struct sctp_sndinfo), SCTP_SENDV_SNDINFO, 0) < 0) {
  			perror("usrsctp_sendv");
  		}
  	}
  	while (usrsctp_finish() != 0) {
  #ifdef _WIN32
  		Sleep(1000);
  #else
  		sleep(1);
  #endif
  	}
  #ifdef _WIN32
  	TerminateThread(tid, 0);
  	WaitForSingleObject(tid, INFINITE);
  	if (closesocket(fd) == SOCKET_ERROR) {
  		printf("closesocket() failed with error: %d\n", WSAGetLastError());
  	}
  	WSACleanup();
  #else
  	pthread_cancel(tid);
  	pthread_join(tid, NULL);
  	if (close(fd) < 0) {
  		perror("close");
  	}
  #endif
  	return (0);
  }
  