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.
   */
  
  /*
   * Usage: client_upcall remote_addr remote_port [local_port] [local_encaps_port] [remote_encaps_port]
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdarg.h>
  
  #if !defined(_WIN32)
  #include <unistd.h>
  #include <sys/time.h>
  #endif /* !defined(_WIN32) */
  
  #include <sys/types.h>
  
  #if !defined(_WIN32)
  #include <sys/socket.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  #else /* !defined(_WIN32) */
  #include <io.h>
  #endif
  
  #include <usrsctp.h>
  #include "programs_helper.h"
  #include <fcntl.h>
  
  #define BUFFERSIZE                 (1<<16)
  
  int done = 0, input_done = 0, connected = 0;
  
  #ifdef _WIN32
  typedef char* caddr_t;
  #endif
  
  int inputAvailable(void)
  {
  	struct timeval tv;
  	fd_set fds;
  	tv.tv_sec = 0;
  	tv.tv_usec = 0;
  	FD_ZERO(&fds);
  #if defined(_WIN32) && !defined(__MINGW32__)
  	FD_SET(_fileno(stdin), &fds);
    	select(_fileno(stdin) + 1, &fds, NULL, NULL, &tv);
  #else
  	FD_SET(STDIN_FILENO, &fds);
  	select(STDIN_FILENO+1, &fds, NULL, NULL, &tv);
  #endif
    return (FD_ISSET(0, &fds));
  }
  
  static void
  handle_upcall(struct socket *sock, void *arg, int flgs)
  {
  	int events = usrsctp_get_events(sock);
  
  	if (events & SCTP_EVENT_WRITE && !done && !connected) {
  		connected = 1;
  		printf("socket connected\n");
  		return;
  	}
  
  	while (events & SCTP_EVENT_READ && !done && connected) {
  		struct sctp_recvv_rn rn;
  		ssize_t n;
  		struct sockaddr_in addr;
  		char *buf = calloc(1, BUFFERSIZE);
  		int flags = 0;
  		socklen_t len = (socklen_t)sizeof(struct sockaddr_in);
  		unsigned int infotype = 0;
  		socklen_t infolen = sizeof(struct sctp_recvv_rn);
  		memset(&rn, 0, sizeof(struct sctp_recvv_rn));
  		n = usrsctp_recvv(sock, buf, BUFFERSIZE, (struct sockaddr *) &addr, &len, (void *)&rn,
  					 &infolen, &infotype, &flags);
  
  		if (n > 0) {
  #ifdef _WIN32
  			_write(_fileno(stdout), buf, (unsigned int)n);
  #else
  			if (write(fileno(stdout), buf, n) < 0) {
  				perror("write");
  			}
  #endif
  		} else if (n == 0) {
  			done = 1;
  			input_done = 1;
  			free(buf);
  			break;
  		} else {
  			perror("\nusrsctp_recvv");
  			free (buf);
  			break;
  		}
  		free(buf);
  		events = usrsctp_get_events(sock);
  	}
  	return;
  }
  
  int
  main(int argc, char *argv[])
  {
  	struct socket *sock;
  	struct sockaddr *addr, *addrs;
  	struct sockaddr_in addr4;
  	struct sockaddr_in6 addr6;
  	struct sctp_udpencaps encaps;
  	struct sctpstat stat;
  	char buffer[200];
  	int i, n;
  
  	if (argc > 4) {
  		usrsctp_init(atoi(argv[4]), 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);
  	usrsctp_sysctl_set_sctp_no_csum_on_loopback(0);
  
  	if ((sock = usrsctp_socket(AF_INET6, SOCK_STREAM, IPPROTO_SCTP, NULL, NULL, 0, NULL)) == NULL) {
  		perror("usrsctp_socket");
  		exit(1);
  	}
  
  	usrsctp_set_non_blocking(sock, 1);
  
  	if (argc > 3) {
  		memset((void *)&addr6, 0, sizeof(struct sockaddr_in6));
  #ifdef HAVE_SIN6_LEN
  		addr6.sin6_len = sizeof(struct sockaddr_in6);
  #endif
  		addr6.sin6_family = AF_INET6;
  		addr6.sin6_port = htons(atoi(argv[3]));
  		addr6.sin6_addr = in6addr_any;
  		if (usrsctp_bind(sock, (struct sockaddr *)&addr6, sizeof(struct sockaddr_in6)) < 0) {
  			perror("bind");
  			usrsctp_close(sock);
  			exit(1);
  		}
  	}
  	if (argc > 5) {
  		memset(&encaps, 0, sizeof(struct sctp_udpencaps));
  		encaps.sue_address.ss_family = AF_INET6;
  		encaps.sue_port = htons(atoi(argv[5]));
  		if (usrsctp_setsockopt(sock, IPPROTO_SCTP, SCTP_REMOTE_UDP_ENCAPS_PORT, (const void*)&encaps, (socklen_t)sizeof(struct sctp_udpencaps)) < 0) {
  			perror("setsockopt");
  			usrsctp_close(sock);
  			exit(1);
  		}
  	}
  
  	memset((void *)&addr4, 0, sizeof(struct sockaddr_in));
  	memset((void *)&addr6, 0, sizeof(struct sockaddr_in6));
  #ifdef HAVE_SIN_LEN
  	addr4.sin_len = sizeof(struct sockaddr_in);
  #endif
  #ifdef HAVE_SIN6_LEN
  	addr6.sin6_len = sizeof(struct sockaddr_in6);
  #endif
  	addr4.sin_family = AF_INET;
  	addr6.sin6_family = AF_INET6;
  	addr4.sin_port = htons(atoi(argv[2]));
  	addr6.sin6_port = htons(atoi(argv[2]));
  	if (inet_pton(AF_INET6, argv[1], &addr6.sin6_addr) == 1) {
  		if (usrsctp_connect(sock, (struct sockaddr *)&addr6, sizeof(struct sockaddr_in6)) < 0) {
  			perror("usrsctp_connect");
  		}
  	} else if (inet_pton(AF_INET, argv[1], &addr4.sin_addr) == 1) {
  		if (usrsctp_connect(sock, (struct sockaddr *)&addr4, sizeof(struct sockaddr_in)) < 0) {
  			perror("usrsctp_connect");
  		}
  	} else {
  		printf("Illegal destination address.\n");
  	}
  
  	usrsctp_set_upcall(sock, handle_upcall, NULL);
  	if ((n = usrsctp_getladdrs(sock, 0, &addrs)) < 0) {
  		perror("usrsctp_getladdrs");
  	} else {
  		addr = addrs;
  		printf("Local addresses: ");
  		for (i = 0; i < n; i++) {
  			if (i > 0) {
  				printf("%s", ", ");
  			}
  			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);
  				printf("%s", name);
  #ifndef HAVE_SA_LEN
  				addr = (struct sockaddr *)((caddr_t)addr + sizeof(struct sockaddr_in));
  #endif
  				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);
  				printf("%s", name);
  #ifndef HAVE_SA_LEN
  				addr = (struct sockaddr *)((caddr_t)addr + sizeof(struct sockaddr_in6));
  #endif
  				break;
  			}
  			default:
  				break;
  			}
  #ifdef HAVE_SA_LEN
  			addr = (struct sockaddr *)((caddr_t)addr + addr->sa_len);
  #endif
  		}
  		printf(".\n");
  		usrsctp_freeladdrs(addrs);
  	}
  	if ((n = usrsctp_getpaddrs(sock, 0, &addrs)) < 0) {
  		perror("usrsctp_getpaddrs");
  	} else {
  		addr = addrs;
  		printf("Peer addresses: ");
  		for (i = 0; i < n; i++) {
  			if (i > 0) {
  				printf("%s", ", ");
  			}
  			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);
  				printf("%s", name);
  #ifndef HAVE_SA_LEN
  				addr = (struct sockaddr *)((caddr_t)addr + sizeof(struct sockaddr_in));
  #endif
  				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);
  				printf("%s", name);
  #ifndef HAVE_SA_LEN
  				addr = (struct sockaddr *)((caddr_t)addr + sizeof(struct sockaddr_in6));
  #endif
  				break;
  			}
  			default:
  				break;
  			}
  #ifdef HAVE_SA_LEN
  			addr = (struct sockaddr *)((caddr_t)addr + addr->sa_len);
  #endif
  		}
  		printf(".\n");
  		usrsctp_freepaddrs(addrs);
  	}
  	while (!done && !input_done) {
  		if (inputAvailable()) {
  			if (fgets(buffer, sizeof(buffer), stdin) != NULL) {
  				buffer[strlen(buffer)] = '\0';
  				usrsctp_sendv(sock, buffer, strlen(buffer), NULL, 0, NULL, 0, SCTP_SENDV_NOINFO, 0);
  			} else {
  				if (usrsctp_shutdown(sock, SHUT_WR) < 0) {
  					perror("usrsctp_shutdown");
  				}
  				break;
  			}
  		}
  	}
  #ifdef _WIN32
  	Sleep(1000);
  #else
  	sleep(1);
  #endif
  	usrsctp_close(sock);
  
  	usrsctp_get_stat(&stat);
  	printf("Number of packets (sent/received): (%u/%u).\n",
  	       stat.sctps_outpackets, stat.sctps_inpackets);
  	while (usrsctp_finish() != 0) {
  #ifdef _WIN32
  		Sleep(1000);
  #else
  		sleep(1);
  #endif
  	}
  	printf("Client finished\n");
  	return(0);
  }
  