text: /*
   * Copyright (C) 2011-2013 Michael Tuexen
   * Copyright (C) 2011-2015 Colin Caughie
   * Copyright (C) 2011-2019 Felix Weinrank
   *
   * 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: st_client local_addr local_port remote_addr remote_port remote_sctp_port
   */
  
  #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 <sys/time.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 BUFFER_SIZE 80
  #define DISCARD_PPID 39
  #define HTTP_PPID 63
  
  #define TIMER_INTERVAL_MSECS 10
  
  static int connecting = 0;
  static int finish = 0;
  
  static unsigned int
  get_tick_count(void)
  {
  #ifdef _WIN32
  	return GetTickCount();
  #else
  	struct timeval tv;
  	unsigned int milliseconds;
  
  	gettimeofday(&tv, NULL); /* get current time */
  	milliseconds = tv.tv_sec*1000LL + tv.tv_usec/1000; /* calculate milliseconds */
  	return (milliseconds);
  #endif
  }
  
  static void
  handle_events(int sock, struct socket* s, void* sconn_addr)
  {
  	char *dump_buf;
  	ssize_t length;
  	char buf[MAX_PACKET_SIZE];
  
  	fd_set rfds;
  	struct timeval tv;
  
  	unsigned next_fire_time = get_tick_count();
  	unsigned last_fire_time = next_fire_time;
  	unsigned now = get_tick_count();
  	int wait_time;
  
  	while (!finish) {
  		if ((int) (now - next_fire_time) > 0) {
  			usrsctp_handle_timers(now - last_fire_time);
  			last_fire_time = now;
  			next_fire_time = now + TIMER_INTERVAL_MSECS;
  		}
  
  		wait_time = next_fire_time - now;
  		tv.tv_sec = wait_time / 1000;
  		tv.tv_usec = (wait_time % 1000) * 1000;
  
  		FD_ZERO(&rfds);
  		FD_SET(sock, &rfds);
  
  		select(sock + 1, &rfds, NULL, NULL, &tv);
  
  		if (FD_ISSET(sock, &rfds)) {
  			length = recv(sock, 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(sconn_addr, buf, (size_t)length, 0);
  			}
  		}
  	}
  }
  
  static void
  on_connect(struct socket* s)
  {
  	struct sctp_sndinfo sndinfo;
  	char buffer[BUFFER_SIZE];
  	int bufferlen;
  
  	/* memset(buffer, 'A', BUFFER_SIZE); */
  	/* bufferlen = BUFFER_SIZE; */
  	bufferlen = snprintf(buffer, BUFFER_SIZE, "GET / HTTP/1.0\r\nUser-agent: libusrsctp\r\nConnection: close\r\n\r\n");
  	sndinfo.snd_sid = 0;
  	sndinfo.snd_flags = 0;
  	sndinfo.snd_ppid = htonl(DISCARD_PPID);
  	sndinfo.snd_context = 0;
  	sndinfo.snd_assoc_id = 0;
  	if (usrsctp_sendv(s, buffer, bufferlen, NULL, 0, (void *)&sndinfo,
  	                  (socklen_t)sizeof(struct sctp_sndinfo), SCTP_SENDV_SNDINFO, 0) < 0) {
  		perror("usrsctp_sendv");
  	}
  }
  
  static void
  on_socket_readable(struct socket* s) {
  	char buffer[BUFFER_SIZE];
  	union sctp_sockstore addr;
  	socklen_t fromlen = sizeof(addr);
  	struct sctp_rcvinfo rcv_info;
  	socklen_t infolen = sizeof(rcv_info);
  	unsigned int infotype = 0;
  	int flags = 0;
  	ssize_t retval;
  
  	/* Keep reading until there is no more data */
  	for (;;) {
  		retval = usrsctp_recvv(s, buffer, sizeof(buffer), (struct sockaddr*) &addr,
  		                       &fromlen, &rcv_info, &infolen, &infotype, &flags);
  
  		if (retval < 0) {
  			if (errno != EWOULDBLOCK) {
  				perror("usrsctp_recvv");
  				finish = 1;
  			}
  			return;
  		} else if (retval == 0) {
  			printf("socket was disconnected\n");
  			finish = 1;
  			return;
  		}
  
  		if (flags & MSG_NOTIFICATION) {
  			printf("Notification of length %d received.\n", (int)retval);
  		} else {
  			printf("Msg of length %d received via %p:%u on stream %d with SSN %u and TSN %u, PPID %d, context %u.\n",
  			       (int)retval,
  			       addr.sconn.sconn_addr,
  			       ntohs(addr.sconn.sconn_port),
  			       rcv_info.rcv_sid,
  			       rcv_info.rcv_ssn,
  			       rcv_info.rcv_tsn,
  			       ntohl(rcv_info.rcv_ppid),
  			       rcv_info.rcv_context);
  		}
  	}
  }
  
  static void
  handle_upcall(struct socket *s, void *arg, int flags)
  {
      int events = usrsctp_get_events(s);
  
  	if (connecting) {
  		if (events & SCTP_EVENT_ERROR) {
  			connecting = 0;
  			finish = 1;
  		} else if (events & SCTP_EVENT_WRITE) {
  			connecting = 0;
  			on_connect(s);
  		}
  
  		return;
  	}
  
  	if (events & SCTP_EVENT_READ) {
  		on_socket_readable(s);
  	}
  }
  
  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);
  	}
  }
  
  /* Usage: st_client local_addr local_port remote_addr remote_port remote_sctp_port */
  int
  main(int argc, char *argv[])
  {
  	struct sockaddr_in sin;
  	struct sockaddr_conn sconn;
  #ifdef _WIN32
  	SOCKET fd;
  #else
  	int fd;
  #endif
  	struct socket *s;
  	int retval;
  #ifdef _WIN32
  	WSADATA wsaData;
  #endif
  	const int on = 1;
  
  	if (argc < 6) {
  		printf("Usage: st_client local_addr local_port remote_addr remote_port remote_sctp_port\n");
  		return (-1);
  	}
  
  #ifdef _WIN32
  	if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0) {
  		printf("WSAStartup failed\n");
  		return (-1);
  	}
  #endif
  	usrsctp_init_nothreads(0, conn_output, debug_printf);
  	/* set up a connected UDP socket */
  #ifdef _WIN32
  	if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET) {
  		printf("socket() failed with error: %ld\n", WSAGetLastError());
  		return (-1);
  	}
  #else
  	if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
  		perror("socket");
  		return (-1);
  	}
  #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");
  		return (-1);
  	}
  #ifdef _WIN32
  	if (bind(fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) == SOCKET_ERROR) {
  		printf("bind() failed with error: %ld\n", WSAGetLastError());
  		return (-1);
  	}
  #else
  	if (bind(fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) < 0) {
  		perror("bind");
  		return (-1);
  	}
  #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");
  		return (-1);
  	}
  #ifdef _WIN32
  	if (connect(fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) == SOCKET_ERROR) {
  		printf("connect() failed with error: %ld\n", WSAGetLastError());
  		return (-1);
  	}
  #else
  	if (connect(fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) < 0) {
  		perror("connect");
  		return (-1);
  	}
  #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);
  
  	if ((s = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, NULL, NULL, 0, NULL)) == NULL) {
  		perror("usrsctp_socket");
  		return (-1);
  	}
  
  	usrsctp_setsockopt(s, IPPROTO_SCTP, SCTP_RECVRCVINFO, &on, sizeof(int));
  	usrsctp_set_non_blocking(s, 1);
  	usrsctp_set_upcall(s, handle_upcall, NULL);
  
  	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(0);
  	sconn.sconn_addr = NULL;
  	if (usrsctp_bind(s, (struct sockaddr *)&sconn, sizeof(struct sockaddr_conn)) < 0) {
  		perror("usrsctp_bind");
  		return (-1);
  	}
  
  	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;
  
  	retval = usrsctp_connect(s, (struct sockaddr *)&sconn, sizeof(struct sockaddr_conn));
  
  	if (retval < 0 && errno != EWOULDBLOCK && errno != EINPROGRESS) {
  		perror("usrsctp_connect");
  		return (-1);
  	}
  
  	connecting = 1;
  
  	handle_events(fd, s, sconn.sconn_addr);
  
  	return (0);
  }
  