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 <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 (1<<20)
  #define DISCARD_PPID 39
  #define NUMBER_OF_STEPS 10
  
  #ifdef _WIN32
  static DWORD WINAPI
  #else
  static void *
  #endif
  handle_packets(void *arg)
  {
  #ifdef _WIN32
  	SOCKET *fdp;
  #else
  	int *fdp;
  #endif
  	char *dump_buf;
  	ssize_t length;
  	char buf[MAX_PACKET_SIZE];
  
  #ifdef _WIN32
  	fdp = (SOCKET *)arg;
  #else
  	fdp = (int *)arg;
  #endif
  	for (;;) {
  #if defined(__NetBSD__)
  		pthread_testcancel();
  #endif
  		length = recv(*fdp, buf, MAX_PACKET_SIZE, 0);
  		if (length > 0) {
  			if ((dump_buf = usrsctp_dumppacket(buf, (size_t)length, SCTP_DUMP_INBOUND)) != NULL) {
  				/* fprintf(stderr, "%s", dump_buf); */
  				usrsctp_freedumpbuffer(dump_buf);
  			}
  			usrsctp_conninput(fdp, buf, (size_t)length, 0);
  		}
  	}
  #ifdef _WIN32
  	return 0;
  #else
  	return (NULL);
  #endif
  }
  
  static int
  conn_output(void *addr, void *buf, size_t length, uint8_t tos, uint8_t set_df)
  {
  	char *dump_buf;
  #ifdef _WIN32
  	SOCKET *fdp;
  #else
  	int *fdp;
  #endif
  
  #ifdef _WIN32
  	fdp = (SOCKET *)addr;
  #else
  	fdp = (int *)addr;
  #endif
  	if ((dump_buf = usrsctp_dumppacket(buf, length, SCTP_DUMP_OUTBOUND)) != NULL) {
  		/* fprintf(stderr, "%s", dump_buf); */
  		usrsctp_freedumpbuffer(dump_buf);
  	}
  #ifdef _WIN32
  	if (send(*fdp, buf, (int)length, 0) == SOCKET_ERROR) {
  		return (WSAGetLastError());
  #else
  	if (send(*fdp, buf, 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)
  {
  	debug_printf("MSG RCV: %p received on sock = %p.\n", data, (void *)sock);
  	if (data) {
  		if ((flags & MSG_NOTIFICATION) == 0) {
  			debug_printf("MSG RCV: length %d, addr %p:%u, stream %u, SSN %u, TSN %u, PPID %u, context %u, %s%s.\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,
  			       (rcv.rcv_flags & SCTP_UNORDERED) ? "unordered" : "ordered",
  				   (flags & MSG_EOR) ? ", EOR" : "");
  		}
  		free(data);
  	} else {
  		usrsctp_deregister_address(ulp_info);
  		usrsctp_close(sock);
  	}
  	return (1);
  }
  
  #if 0
  static void
  print_addresses(struct socket *sock)
  {
  	int i, n;
  	struct sockaddr *addrs, *addr;
  
  	n = usrsctp_getladdrs(sock, 0, &addrs);
  	addr = addrs;
  	for (i = 0; i < n; i++) {
  		switch (addr->sa_family) {
  		case AF_INET:
  		{
  			struct sockaddr_in *sin;
  			char buf[INET_ADDRSTRLEN];
  			const char *name;
  
  			sin = (struct sockaddr_in *)addr;
  			name = inet_ntop(AF_INET, &sin->sin_addr, buf, INET_ADDRSTRLEN);
  			debug_printf("%s:%d", name, ntohs(sin->sin_port));
  			break;
  		}
  		case AF_INET6:
  		{
  			struct sockaddr_in6 *sin6;
  			char buf[INET6_ADDRSTRLEN];
  			const char *name;
  
  			sin6 = (struct sockaddr_in6 *)addr;
  			name = inet_ntop(AF_INET6, &sin6->sin6_addr, buf, INET6_ADDRSTRLEN);
  			debug_printf("%s:%d", name, ntohs(sin6->sin6_port));
  			break;
  		}
  		case AF_CONN:
  		{
  			struct sockaddr_conn *sconn;
  
  			sconn = (struct sockaddr_conn *)addr;
  			debug_printf("%p:%d", sconn->sconn_addr, ntohs(sconn->sconn_port));
  			break;
  		}
  		default:
  			debug_printf("Unknown family: %d", addr->sa_family);
  			break;
  		}
  		addr = (struct sockaddr *)((caddr_t)addr + addr->sa_len);
  		if (i != n - 1) {
  			debug_printf(",");
  		}
  	}
  	if (n > 0) {
  		usrsctp_freeladdrs(addrs);
  	}
  	debug_printf("<->");
  	n = usrsctp_getpaddrs(sock, 0, &addrs);
  	addr = addrs;
  	for (i = 0; i < n; i++) {
  		switch (addr->sa_family) {
  		case AF_INET:
  		{
  			struct sockaddr_in *sin;
  			char buf[INET_ADDRSTRLEN];
  			const char *name;
  
  			sin = (struct sockaddr_in *)addr;
  			name = inet_ntop(AF_INET, &sin->sin_addr, buf, INET_ADDRSTRLEN);
  			debug_printf("%s:%d", name, ntohs(sin->sin_port));
  			break;
  		}
  		case AF_INET6:
  		{
  			struct sockaddr_in6 *sin6;
  			char buf[INET6_ADDRSTRLEN];
  			const char *name;
  
  			sin6 = (struct sockaddr_in6 *)addr;
  			name = inet_ntop(AF_INET6, &sin6->sin6_addr, buf, INET6_ADDRSTRLEN);
  			debug_printf("%s:%d", name, ntohs(sin6->sin6_port));
  			break;
  		}
  		case AF_CONN:
  		{
  			struct sockaddr_conn *sconn;
  
  			sconn = (struct sockaddr_conn *)addr;
  			debug_printf("%p:%d", sconn->sconn_addr, ntohs(sconn->sconn_port));
  			break;
  		}
  		default:
  			debug_printf("Unknown family: %d", addr->sa_family);
  			break;
  		}
  		addr = (struct sockaddr *)((caddr_t)addr + addr->sa_len);
  		if (i != n - 1) {
  			debug_printf(",");
  		}
  	}
  	if (n > 0) {
  		usrsctp_freepaddrs(addrs);
  	}
  	debug_printf("\n");
  }
  #endif
  
  int
  main(int argc, char *argv[])
  {
  	struct sockaddr_in sin_s, sin_c;
  	struct sockaddr_conn sconn;
  #ifdef _WIN32
  	SOCKET fd_c, fd_s;
  #else
  	int fd_c, fd_s;
  #endif
  	struct socket *s_c, *s_s, *s_l;
  #ifdef _WIN32
  	HANDLE tid_c, tid_s;
  #else
  	pthread_t tid_c, tid_s;
  #endif
  	int i, j, cur_buf_size, snd_buf_size, rcv_buf_size;
  	socklen_t opt_len;
  	struct sctp_sndinfo sndinfo;
  	char *line;
  #ifdef _WIN32
  	WSADATA wsaData;
  #endif
  	uint16_t client_port = 9900;
  	uint16_t server_port = 9901;
  
  	if (argc == 3) {
  		client_port = atoi(argv[1]);
  		server_port = atoi(argv[2]);
  	}
  
  	debug_printf("starting program\n");
  
  #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_c = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET) {
  		printf("socket() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  	if ((fd_s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET) {
  		printf("socket() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  #else
  	if ((fd_c = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
  		perror("socket");
  		exit(EXIT_FAILURE);
  	}
  	if ((fd_s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
  		perror("socket");
  		exit(EXIT_FAILURE);
  	}
  #endif
  	memset(&sin_c, 0, sizeof(struct sockaddr_in));
  	sin_c.sin_family = AF_INET;
  #ifdef HAVE_SIN_LEN
  	sin_c.sin_len = sizeof(struct sockaddr_in);
  #endif
  	sin_c.sin_port = htons(client_port);
  	sin_c.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  	memset(&sin_s, 0, sizeof(struct sockaddr_in));
  	sin_s.sin_family = AF_INET;
  #ifdef HAVE_SIN_LEN
  	sin_s.sin_len = sizeof(struct sockaddr_in);
  #endif
  	sin_s.sin_port = htons(server_port);
  	sin_s.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  #ifdef _WIN32
  	if (bind(fd_c, (struct sockaddr *)&sin_c, sizeof(struct sockaddr_in)) == SOCKET_ERROR) {
  		printf("bind() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  	if (bind(fd_s, (struct sockaddr *)&sin_s, sizeof(struct sockaddr_in)) == SOCKET_ERROR) {
  		printf("bind() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  #else
  	if (bind(fd_c, (struct sockaddr *)&sin_c, sizeof(struct sockaddr_in)) < 0) {
  		perror("bind");
  		exit(EXIT_FAILURE);
  	}
  	if (bind(fd_s, (struct sockaddr *)&sin_s, sizeof(struct sockaddr_in)) < 0) {
  		perror("bind");
  		exit(EXIT_FAILURE);
  	}
  #endif
  #ifdef _WIN32
  	if (connect(fd_c, (struct sockaddr *)&sin_s, sizeof(struct sockaddr_in)) == SOCKET_ERROR) {
  		debug_printf("connect() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  	if (connect(fd_s, (struct sockaddr *)&sin_c, sizeof(struct sockaddr_in)) == SOCKET_ERROR) {
  		debug_printf("connect() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  #else
  	if (connect(fd_c, (struct sockaddr *)&sin_s, sizeof(struct sockaddr_in)) < 0) {
  		perror("connect");
  		exit(EXIT_FAILURE);
  	}
  	if (connect(fd_s, (struct sockaddr *)&sin_c, sizeof(struct sockaddr_in)) < 0) {
  		perror("connect");
  		exit(EXIT_FAILURE);
  	}
  #endif
  #ifdef _WIN32
  	tid_c = CreateThread(NULL, 0, &handle_packets, (void *)&fd_c, 0, NULL);
  	tid_s = CreateThread(NULL, 0, &handle_packets, (void *)&fd_s, 0, NULL);
  #else
  	if (pthread_create(&tid_c, NULL, &handle_packets, (void *)&fd_c)) {
  		perror("pthread_create tid_c");
  		exit(EXIT_FAILURE);
  	}
  
  	if (pthread_create(&tid_s, NULL, &handle_packets, (void *)&fd_s)) {
  		perror("pthread_create tid_s");
  		exit(EXIT_FAILURE);
  	};
  #endif
  #ifdef SCTP_DEBUG
  	usrsctp_sysctl_set_sctp_debug_on(SCTP_DEBUG_NONE);
  #endif
  	usrsctp_sysctl_set_sctp_ecn_enable(0);
  	usrsctp_register_address((void *)&fd_c);
  	usrsctp_register_address((void *)&fd_s);
  	if ((s_c = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, receive_cb, NULL, 0, &fd_c)) == NULL) {
  		perror("usrsctp_socket");
  		exit(EXIT_FAILURE);
  	}
  	opt_len = (socklen_t)sizeof(int);
  	cur_buf_size = 0;
  	if (usrsctp_getsockopt(s_c, SOL_SOCKET, SO_SNDBUF, &cur_buf_size, &opt_len) < 0) {
  		perror("usrsctp_getsockopt");
  		exit(EXIT_FAILURE);
  	}
  	debug_printf("Change send socket buffer size from %d ", cur_buf_size);
  	snd_buf_size = 1<<22; /* 4 MB */
  	if (usrsctp_setsockopt(s_c, SOL_SOCKET, SO_SNDBUF, &snd_buf_size, sizeof(int)) < 0) {
  		perror("usrsctp_setsockopt");
  		exit(EXIT_FAILURE);
  	}
  	opt_len = (socklen_t)sizeof(int);
  	cur_buf_size = 0;
  	if (usrsctp_getsockopt(s_c, SOL_SOCKET, SO_SNDBUF, &cur_buf_size, &opt_len) < 0) {
  		perror("usrsctp_getsockopt");
  		exit(EXIT_FAILURE);
  	}
  	debug_printf("to %d.\n", cur_buf_size);
  	if ((s_l = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, receive_cb, NULL, 0, &fd_s)) == NULL) {
  		perror("usrsctp_socket");
  		exit(EXIT_FAILURE);
  	}
  	opt_len = (socklen_t)sizeof(int);
  	cur_buf_size = 0;
  	if (usrsctp_getsockopt(s_l, SOL_SOCKET, SO_RCVBUF, &cur_buf_size, &opt_len) < 0) {
  		perror("usrsctp_getsockopt");
  		exit(EXIT_FAILURE);
  	}
  	debug_printf("Change receive socket buffer size from %d ", cur_buf_size);
  	rcv_buf_size = 1<<16; /* 64 KB */
  	if (usrsctp_setsockopt(s_l, SOL_SOCKET, SO_RCVBUF, &rcv_buf_size, sizeof(int)) < 0) {
  		perror("usrsctp_setsockopt");
  		exit(EXIT_FAILURE);
  	}
  	opt_len = (socklen_t)sizeof(int);
  	cur_buf_size = 0;
  	if (usrsctp_getsockopt(s_l, SOL_SOCKET, SO_RCVBUF, &cur_buf_size, &opt_len) < 0) {
  		perror("usrsctp_getsockopt");
  		exit(EXIT_FAILURE);
  	}
  	debug_printf("to %d.\n", cur_buf_size);
  	/* Bind the client side. */
  	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(5001);
  	sconn.sconn_addr = &fd_c;
  	if (usrsctp_bind(s_c, (struct sockaddr *)&sconn, sizeof(struct sockaddr_conn)) < 0) {
  		perror("usrsctp_bind");
  		exit(EXIT_FAILURE);
  	}
  	/* Bind the server side. */
  	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(5001);
  	sconn.sconn_addr = &fd_s;
  	if (usrsctp_bind(s_l, (struct sockaddr *)&sconn, sizeof(struct sockaddr_conn)) < 0) {
  		perror("usrsctp_bind");
  		exit(EXIT_FAILURE);
  	}
  	/* Make server side passive... */
  	if (usrsctp_listen(s_l, 1) < 0) {
  		perror("usrsctp_listen");
  		exit(EXIT_FAILURE);
  	}
  	/* Initiate the handshake */
  	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(5001);
  	sconn.sconn_addr = &fd_c;
  	if (usrsctp_connect(s_c, (struct sockaddr *)&sconn, sizeof(struct sockaddr_conn)) < 0) {
  		perror("usrsctp_connect");
  		exit(EXIT_FAILURE);
  	}
  	if ((s_s = usrsctp_accept(s_l, NULL, NULL)) == NULL) {
  		perror("usrsctp_accept");
  		exit(EXIT_FAILURE);
  	}
  	usrsctp_close(s_l);
  	if ((line = malloc(LINE_LENGTH)) == NULL) {
  		exit(EXIT_FAILURE);
  	}
  	memset(line, 'A', LINE_LENGTH);
  	sndinfo.snd_sid = 1;
  	sndinfo.snd_ppid = htonl(DISCARD_PPID);
  	sndinfo.snd_context = 0;
  	sndinfo.snd_assoc_id = 0;
  
  	for (i = 0; i < NUMBER_OF_STEPS; i++) {
  		j = 0;
  		if (i % 2) {
  			sndinfo.snd_flags = SCTP_UNORDERED;
  		} else {
  			sndinfo.snd_flags = 0;
  		}
  		/* Send a 1 MB message */
  		debug_printf("usrscp_sendv - step %d - call %d flags %x\n", i, ++j, sndinfo.snd_flags);
  		if (usrsctp_sendv(s_c, line, LINE_LENGTH, NULL, 0, (void *)&sndinfo,
  				 (socklen_t)sizeof(struct sctp_sndinfo), SCTP_SENDV_SNDINFO, 0) < 0) {
  			perror("usrsctp_sendv");
  			exit(EXIT_FAILURE);
  		}
  		/* Send a 1 MB message */
  		debug_printf("usrscp_sendv - step %d - call %d flags %x\n", i, ++j, sndinfo.snd_flags);
  		if (usrsctp_sendv(s_c, line, LINE_LENGTH, NULL, 0, (void *)&sndinfo,
  				 (socklen_t)sizeof(struct sctp_sndinfo), SCTP_SENDV_SNDINFO, 0) < 0) {
  			perror("usrsctp_sendv");
  			exit(EXIT_FAILURE);
  		}
  		debug_printf("Sending done, sleeping\n");
  #ifdef _WIN32
  		Sleep(10000);
  #else
  		sleep(10);
  #endif
  	}
  	free(line);
  	usrsctp_shutdown(s_c, SHUT_WR);
  
  	while (usrsctp_finish() != 0) {
  #ifdef _WIN32
  		Sleep(1000);
  #else
  		sleep(1);
  #endif
  	}
  #ifdef _WIN32
  	TerminateThread(tid_c, 0);
  	WaitForSingleObject(tid_c, INFINITE);
  	TerminateThread(tid_s, 0);
  	WaitForSingleObject(tid_s, INFINITE);
  	if (closesocket(fd_c) == SOCKET_ERROR) {
  		debug_printf("closesocket() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  	if (closesocket(fd_s) == SOCKET_ERROR) {
  		debug_printf("closesocket() failed with error: %d\n", WSAGetLastError());
  		exit(EXIT_FAILURE);
  	}
  	WSACleanup();
  #else
  	pthread_cancel(tid_c);
  	pthread_join(tid_c, NULL);
  	pthread_cancel(tid_s);
  	pthread_join(tid_s, NULL);
  	if (close(fd_c) < 0) {
  		perror("close");
  		exit(EXIT_FAILURE);
  	}
  	if (close(fd_s) < 0) {
  		perror("close");
  		exit(EXIT_FAILURE);
  	}
  #endif
  	return (0);
  }
  