diff --git a/programs/rtcweb.c b/programs/rtcweb.c
new file mode 100644
index 0000000..4b940ed
--- /dev/null
+++ b/programs/rtcweb.c
@@ -0,0 +1,1517 @@
+/*-
+ * Copyright (C) 2012-2013 Michael Tuexen
+ * Copyright (C) 2012-2013 Irene Ruengeler
+ *
+ * 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.
+ *
+ * $Id: rtcweb.c,v 1.26 2012-07-17 13:50:02 tuexen Exp $
+ */
+
+/*
+ * gcc -Wall -std=c99 -pedantic -o rtcweb rtcweb.c -lusrsctp
+ */
+
+#include <sys/types.h>
+#ifdef _WIN32
+#define _CRT_SECURE_NO_WARNINGS
+#include <WinSock2.h>
+#include <WS2tcpip.h>
+#include <crtdbg.h>
+#else
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <stdint.h>
+#endif
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <usrsctp.h>
+
+#define LINE_LENGTH (1024)
+#define BUFFER_SIZE (1<<16)
+#define NUMBER_OF_CHANNELS (100)
+#define NUMBER_OF_STREAMS (100)
+
+#define DATA_CHANNEL_PPID_CONTROL   50
+#define DATA_CHANNEL_PPID_DOMSTRING 51
+#define DATA_CHANNEL_PPID_BINARY    52
+
+#define DATA_CHANNEL_CLOSED     0
+#define DATA_CHANNEL_CONNECTING 1
+#define DATA_CHANNEL_OPEN       2
+#define DATA_CHANNEL_CLOSING    3
+
+#define DATA_CHANNEL_FLAGS_SEND_REQ 0x00000001
+#define DATA_CHANNEL_FLAGS_SEND_RSP 0x00000002
+#define DATA_CHANNEL_FLAGS_SEND_ACK 0x00000004
+
+struct channel {
+	uint32_t id;
+	uint32_t pr_value;
+	uint16_t pr_policy;
+	uint16_t i_stream;
+	uint16_t o_stream;
+	uint8_t unordered;
+	uint8_t state;
+	uint32_t flags;
+};
+
+struct peer_connection {
+	struct channel channels[NUMBER_OF_CHANNELS];
+	struct channel *i_stream_channel[NUMBER_OF_STREAMS];
+	struct channel *o_stream_channel[NUMBER_OF_STREAMS];
+	uint16_t o_stream_buffer[NUMBER_OF_STREAMS];
+	uint32_t o_stream_buffer_counter;
+#ifdef _WIN32
+	CRITICAL_SECTION mutex;
+#else
+	pthread_mutex_t mutex;
+#endif
+	struct socket *sock;
+} peer_connection;
+
+#define DATA_CHANNEL_OPEN_REQUEST  0
+#define DATA_CHANNEL_OPEN_RESPONSE 1
+#define DATA_CHANNEL_ACK           2
+
+#define DATA_CHANNEL_RELIABLE                0
+#define DATA_CHANNEL_RELIABLE_STREAM         1
+#define DATA_CHANNEL_UNRELIABLE              2
+#define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT 3
+#define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED  4
+
+#define DATA_CHANNEL_FLAG_OUT_OF_ORDER_ALLOWED 0x0001
+
+#ifndef _WIN32
+#define SCTP_PACKED __attribute__((packed))
+#else
+#pragma pack (push, 1)
+#define SCTP_PACKED
+#endif
+
+struct rtcweb_datachannel_open_request {
+	uint8_t msg_type; /* DATA_CHANNEL_OPEN_REQUEST */
+	uint8_t channel_type;
+	uint16_t flags;
+	uint16_t reliability_params;
+	int16_t priority;
+	char label[];
+} SCTP_PACKED;
+
+struct rtcweb_datachannel_open_response {
+	uint8_t  msg_type; /* DATA_CHANNEL_OPEN_RESPONSE */
+	uint8_t  error;
+	uint16_t flags;
+	uint16_t reverse_stream;
+} SCTP_PACKED;
+
+struct rtcweb_datachannel_ack {
+	uint8_t  msg_type; /* DATA_CHANNEL_ACK */
+} SCTP_PACKED;
+
+#ifdef _WIN32
+#pragma pack()
+#endif
+
+#undef SCTP_PACKED
+
+static void
+init_peer_connection(struct peer_connection *pc)
+{
+	uint32_t i;
+	struct channel *channel;
+
+	for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
+		channel = &(pc->channels[i]);
+		channel->id = i;
+		channel->state = DATA_CHANNEL_CLOSED;
+		channel->pr_policy = SCTP_PR_SCTP_NONE;
+		channel->pr_value = 0;
+		channel->i_stream = 0;
+		channel->o_stream = 0;
+		channel->unordered = 0;
+		channel->flags = 0;
+	}
+	for (i = 0; i < NUMBER_OF_STREAMS; i++) {
+		pc->i_stream_channel[i] = NULL;
+		pc->o_stream_channel[i] = NULL;
+		pc->o_stream_buffer[i] = 0;
+	}
+	pc->o_stream_buffer_counter = 0;
+	pc->sock = NULL;
+#ifdef _WIN32
+	InitializeCriticalSection(&(pc->mutex));
+#else
+	pthread_mutex_init(&pc->mutex, NULL);
+#endif
+}
+
+static void
+lock_peer_connection(struct peer_connection *pc)
+{
+#ifdef _WIN32
+	EnterCriticalSection(&(pc->mutex));
+#else
+	pthread_mutex_lock(&pc->mutex);
+#endif
+}
+
+static void
+unlock_peer_connection(struct peer_connection *pc)
+{
+#ifdef _WIN32
+	LeaveCriticalSection(&(pc->mutex));
+#else
+	pthread_mutex_unlock(&pc->mutex);
+#endif
+}
+
+static struct channel *
+find_channel_by_i_stream(struct peer_connection *pc, uint16_t i_stream)
+{
+	if (i_stream < NUMBER_OF_STREAMS) {
+		return (pc->i_stream_channel[i_stream]);
+	} else {
+		return (NULL);
+	}
+}
+
+static struct channel *
+find_channel_by_o_stream(struct peer_connection *pc, uint16_t o_stream)
+{
+	if (o_stream < NUMBER_OF_STREAMS) {
+		return (pc->o_stream_channel[o_stream]);
+	} else {
+		return (NULL);
+	}
+}
+
+static struct channel *
+find_free_channel(struct peer_connection *pc)
+{
+	uint32_t i;
+
+	for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
+		if (pc->channels[i].state == DATA_CHANNEL_CLOSED) {
+			break;
+		}
+	}
+	if (i == NUMBER_OF_CHANNELS) {
+		return (NULL);
+	} else {
+		return (&(pc->channels[i]));
+	}
+}
+
+static uint16_t
+find_free_o_stream(struct peer_connection *pc)
+{
+	struct sctp_status status;
+	uint32_t i, limit;
+	socklen_t len;
+
+	len = (socklen_t)sizeof(struct sctp_status);
+	if (usrsctp_getsockopt(pc->sock, IPPROTO_SCTP, SCTP_STATUS, &status, &len) < 0) {
+		perror("getsockopt");
+		return (0);
+	}
+	if (status.sstat_outstrms < NUMBER_OF_STREAMS) {
+		limit = status.sstat_outstrms;
+	} else {
+		limit = NUMBER_OF_STREAMS;
+	}
+	/* stream id 0 is reserved */
+	for (i = 1; i < limit; i++) {
+		if (pc->o_stream_channel[i] == NULL) {
+			break;
+		}
+	}
+	if (i == limit) {
+		return (0);
+	} else {
+		return ((uint16_t)i);
+	}
+}
+
+static void
+request_more_o_streams(struct peer_connection *pc)
+{
+	struct sctp_status status;
+	struct sctp_add_streams sas;
+	uint32_t i, o_streams_needed;
+	socklen_t len;
+
+	o_streams_needed = 0;
+	for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
+		if ((pc->channels[i].state == DATA_CHANNEL_CONNECTING) &&
+		    (pc->channels[i].o_stream == 0)) {
+			o_streams_needed++;
+		}
+	}
+	len = (socklen_t)sizeof(struct sctp_status);
+	if (usrsctp_getsockopt(pc->sock, IPPROTO_SCTP, SCTP_STATUS, &status, &len) < 0) {
+		perror("getsockopt");
+		return;
+	}
+	if (status.sstat_outstrms + o_streams_needed > NUMBER_OF_STREAMS) {
+		o_streams_needed = NUMBER_OF_STREAMS - status.sstat_outstrms;
+	}
+	if (o_streams_needed == 0) {
+		return;
+	}
+	memset(&sas, 0, sizeof(struct sctp_add_streams));
+	sas.sas_instrms = 0;
+	sas.sas_outstrms = (uint16_t)o_streams_needed; /* XXX eror handling */
+	if (usrsctp_setsockopt(pc->sock, IPPROTO_SCTP, SCTP_ADD_STREAMS, &sas, (socklen_t)sizeof(struct sctp_add_streams)) < 0) {
+		perror("setsockopt");
+	}
+	return;
+}
+
+static int
+send_open_request_message(struct socket *sock, uint16_t o_stream, uint8_t unordered, uint16_t pr_policy, uint32_t pr_value)
+{
+	/* XXX: This should be encoded in a better way */
+	struct rtcweb_datachannel_open_request req;
+	struct sctp_sndinfo sndinfo;
+
+	memset(&req, 0, sizeof(struct rtcweb_datachannel_open_request));
+	req.msg_type = DATA_CHANNEL_OPEN_REQUEST;
+	switch (pr_policy) {
+	case SCTP_PR_SCTP_NONE:
+		/* XXX: What about DATA_CHANNEL_RELIABLE_STREAM */
+		req.channel_type = DATA_CHANNEL_RELIABLE;
+		break;
+	case SCTP_PR_SCTP_TTL:
+		/* XXX: What about DATA_CHANNEL_UNRELIABLE */
+		req.channel_type = DATA_CHANNEL_PARTIAL_RELIABLE_TIMED;
+		break;
+	case SCTP_PR_SCTP_RTX:
+		req.channel_type = DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT;
+		break;
+	default:
+		return (0);
+	}
+	req.flags = htons(0);
+	if (unordered) {
+		req.flags |= htons(DATA_CHANNEL_FLAG_OUT_OF_ORDER_ALLOWED);
+	}
+	req.reliability_params = htons((uint16_t)pr_value); /* XXX Why 16-bit */
+	req.priority = htons(0); /* XXX: add support */
+	memset(&sndinfo, 0, sizeof(struct sctp_sndinfo));
+	sndinfo.snd_sid = o_stream;
+	sndinfo.snd_flags = SCTP_EOR;
+	sndinfo.snd_ppid = htonl(DATA_CHANNEL_PPID_CONTROL);
+	if (usrsctp_sendv(sock,
+	                  &req, sizeof(struct rtcweb_datachannel_open_request),
+	                  NULL, 0,
+	                  &sndinfo, (socklen_t)sizeof(struct sctp_sndinfo),
+	                  SCTP_SENDV_SNDINFO, 0) < 0) {
+		perror("sctp_sendv");
+		return (0);
+	} else {
+		return (1);
+	}
+}
+
+static int
+send_open_response_message(struct socket *sock, uint16_t o_stream, uint16_t i_stream)
+{
+	/* XXX: This should be encoded in a better way */
+	struct rtcweb_datachannel_open_response rsp;
+	struct sctp_sndinfo sndinfo;
+
+	memset(&rsp, 0, sizeof(struct rtcweb_datachannel_open_response));
+	rsp.msg_type = DATA_CHANNEL_OPEN_RESPONSE;
+	rsp.error = 0;
+	rsp.flags = htons(0);
+	rsp.reverse_stream = htons(i_stream);
+	memset(&sndinfo, 0, sizeof(struct sctp_sndinfo));
+	sndinfo.snd_sid = o_stream;
+	sndinfo.snd_flags = SCTP_EOR;
+	sndinfo.snd_ppid = htonl(DATA_CHANNEL_PPID_CONTROL);
+	if (usrsctp_sendv(sock,
+	                  &rsp, sizeof(struct rtcweb_datachannel_open_response),
+	                  NULL, 0,
+	                  &sndinfo, (socklen_t)sizeof(struct sctp_sndinfo),
+	                  SCTP_SENDV_SNDINFO, 0) < 0) {
+		perror("sctp_sendv");
+		return (0);
+	} else {
+		return (1);
+	}
+}
+
+static int
+send_open_ack_message(struct socket *sock, uint16_t o_stream)
+{
+	/* XXX: This should be encoded in a better way */
+	struct rtcweb_datachannel_ack ack;
+	struct sctp_sndinfo sndinfo;
+
+	memset(&ack, 0, sizeof(struct rtcweb_datachannel_ack));
+	ack.msg_type = DATA_CHANNEL_ACK;
+	memset(&sndinfo, 0, sizeof(struct sctp_sndinfo));
+	sndinfo.snd_sid = o_stream;
+	sndinfo.snd_flags = SCTP_EOR;
+	sndinfo.snd_ppid = htonl(DATA_CHANNEL_PPID_CONTROL);
+	if (usrsctp_sendv(sock,
+	                  &ack, sizeof(struct rtcweb_datachannel_ack),
+	                  NULL, 0,
+	                  &sndinfo, (socklen_t)sizeof(struct sctp_sndinfo),
+	                  SCTP_SENDV_SNDINFO, 0) < 0) {
+		perror("sctp_sendv");
+		return (0);
+	} else {
+		return (1);
+	}
+}
+
+static void
+send_deferred_messages(struct peer_connection *pc)
+{
+	uint32_t i;
+	struct channel *channel;
+
+	for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
+		channel = &(pc->channels[i]);
+		if (channel->flags & DATA_CHANNEL_FLAGS_SEND_REQ) {
+			if (send_open_request_message(pc->sock, channel->o_stream, channel->unordered, channel->pr_policy, channel->pr_value)) {
+				channel->flags &= ~DATA_CHANNEL_FLAGS_SEND_REQ;
+			} else {
+				if (errno != EAGAIN) {
+					/* XXX: error handling */
+				}
+			}
+		}
+		if (channel->flags & DATA_CHANNEL_FLAGS_SEND_RSP) {
+			if (send_open_response_message(pc->sock, channel->o_stream, channel->i_stream)) {
+				channel->flags &= ~DATA_CHANNEL_FLAGS_SEND_RSP;
+			} else {
+				if (errno != EAGAIN) {
+					/* XXX: error handling */
+				}
+			}
+		}
+		if (channel->flags & DATA_CHANNEL_FLAGS_SEND_ACK) {
+			if (send_open_ack_message(pc->sock, channel->o_stream)) {
+				channel->flags &= ~DATA_CHANNEL_FLAGS_SEND_ACK;
+			} else {
+				if (errno != EAGAIN) {
+					/* XXX: error handling */
+				}
+			}
+		}
+	}
+	return;
+}
+
+static struct channel *
+open_channel(struct peer_connection *pc, uint8_t unordered, uint16_t pr_policy, uint32_t pr_value)
+{
+	struct channel *channel;
+	uint16_t o_stream;
+
+	if ((pr_policy != SCTP_PR_SCTP_NONE) &&
+	    (pr_policy != SCTP_PR_SCTP_TTL) &&
+	    (pr_policy != SCTP_PR_SCTP_RTX)) {
+		return (NULL);
+	}
+	if ((unordered != 0) && (unordered != 1)) {
+		return (NULL);
+	}
+	if ((pr_policy == SCTP_PR_SCTP_NONE) && (pr_value != 0)) {
+		return (NULL);
+	}
+	if ((channel = find_free_channel(pc)) == NULL) {
+		return (NULL);
+	}
+	o_stream = find_free_o_stream(pc);
+	channel->state = DATA_CHANNEL_CONNECTING;
+	channel->unordered = unordered;
+	channel->pr_policy = pr_policy;
+	channel->pr_value = pr_value;
+	channel->o_stream = o_stream;
+	channel->flags = 0;
+	if (o_stream == 0) {
+		request_more_o_streams(pc);
+	} else {
+		if (send_open_request_message(pc->sock, o_stream, unordered, pr_policy, pr_value)) {
+			pc->o_stream_channel[o_stream] = channel;
+		} else {
+			if (errno == EAGAIN) {
+				pc->o_stream_channel[o_stream] = channel;
+				channel->flags |= DATA_CHANNEL_FLAGS_SEND_REQ;
+			} else {
+				channel->state = DATA_CHANNEL_CLOSED;
+				channel->unordered = 0;
+				channel->pr_policy = 0;
+				channel->pr_value = 0;
+				channel->o_stream = 0;
+				channel->flags = 0;
+				channel = NULL;
+			}
+		}
+	}
+	return (channel);
+}
+
+static int
+send_user_message(struct peer_connection *pc, struct channel *channel, char *message, size_t length)
+{
+	struct sctp_sendv_spa spa;
+
+	if (channel == NULL) {
+		return (0);
+	}
+	if ((channel->state != DATA_CHANNEL_OPEN) &&
+	    (channel->state != DATA_CHANNEL_CONNECTING)) {
+		/* XXX: What to do in other states */
+		return (0);
+	}
+
+	memset(&spa, 0, sizeof(struct sctp_sendv_spa));
+	spa.sendv_sndinfo.snd_sid = channel->o_stream;
+	if ((channel->state == DATA_CHANNEL_OPEN) &&
+	    (channel->unordered)) {
+		spa.sendv_sndinfo.snd_flags = SCTP_EOR | SCTP_UNORDERED;
+	} else {
+		spa.sendv_sndinfo.snd_flags = SCTP_EOR;
+	}
+	spa.sendv_sndinfo.snd_ppid = htonl(DATA_CHANNEL_PPID_DOMSTRING);
+	spa.sendv_flags = SCTP_SEND_SNDINFO_VALID;
+	if ((channel->pr_policy == SCTP_PR_SCTP_TTL) ||
+	    (channel->pr_policy == SCTP_PR_SCTP_RTX)) {
+		spa.sendv_prinfo.pr_policy = channel->pr_policy;
+		spa.sendv_prinfo.pr_value = channel->pr_value;
+		spa.sendv_flags |= SCTP_SEND_PRINFO_VALID;
+	}
+	if (usrsctp_sendv(pc->sock,
+	                  message, length,
+	                  NULL, 0,
+	                  &spa, (socklen_t)sizeof(struct sctp_sendv_spa),
+	                  SCTP_SENDV_SPA, 0) < 0) {
+		perror("sctp_sendv");
+		return (0);
+	} else {
+		return (1);
+	}
+}
+
+static void
+reset_outgoing_stream(struct peer_connection *pc, uint16_t o_stream)
+{
+	uint32_t i;
+
+	for (i = 0; i < pc->o_stream_buffer_counter; i++) {
+		if (pc->o_stream_buffer[i] == o_stream) {
+			return;
+		}
+	}
+	pc->o_stream_buffer[pc->o_stream_buffer_counter++] = o_stream;
+	return;
+}
+
+static void
+send_outgoing_stream_reset(struct peer_connection *pc)
+{
+	struct sctp_reset_streams *srs;
+	uint32_t i;
+	size_t len;
+
+	if (pc->o_stream_buffer_counter == 0) {
+		return;
+	}
+	len = sizeof(sctp_assoc_t) + (2 + pc->o_stream_buffer_counter) * sizeof(uint16_t);
+	srs = (struct sctp_reset_streams *)malloc(len);
+	if (srs == NULL) {
+		return;
+	}
+	memset(srs, 0, len);
+	srs->srs_flags = SCTP_STREAM_RESET_OUTGOING;
+	srs->srs_number_streams = pc->o_stream_buffer_counter;
+	for (i = 0; i < pc->o_stream_buffer_counter; i++) {
+		srs->srs_stream_list[i] = pc->o_stream_buffer[i];
+	}
+	if (usrsctp_setsockopt(pc->sock, IPPROTO_SCTP, SCTP_RESET_STREAMS, srs, (socklen_t)len) < 0) {
+		perror("setsockopt");
+	} else {
+		for (i = 0; i < pc->o_stream_buffer_counter; i++) {
+			srs->srs_stream_list[i] = 0;
+		}
+		pc->o_stream_buffer_counter = 0;
+	}
+	free(srs);
+	return;
+}
+
+static void
+close_channel(struct peer_connection *pc, struct channel *channel)
+{
+	if (channel == NULL) {
+		return;
+	}
+	if (channel->state != DATA_CHANNEL_OPEN) {
+		return;
+	}
+	reset_outgoing_stream(pc, channel->o_stream);
+	send_outgoing_stream_reset(pc);
+	channel->state = DATA_CHANNEL_CLOSING;
+	return;
+}
+
+static void
+handle_open_request_message(struct peer_connection *pc,
+                            struct rtcweb_datachannel_open_request *req,
+                            size_t length,
+                            uint16_t i_stream)
+{
+	struct channel *channel;
+	uint32_t pr_value;
+	uint16_t pr_policy;
+	uint16_t o_stream;
+	uint8_t unordered;
+
+	if ((channel = find_channel_by_i_stream(pc, i_stream))) {
+		printf("handle_open_request_message: channel %d is in state %d instead of CLOSED.\n",
+		       channel->id, channel->state);
+		/* XXX: some error handling */
+		return;
+	}
+	if ((channel = find_free_channel(pc)) == NULL) {
+		/* XXX: some error handling */
+		return;
+	}
+	switch (req->channel_type) {
+	case DATA_CHANNEL_RELIABLE:
+		pr_policy = SCTP_PR_SCTP_NONE;
+		break;
+	/* XXX Doesn't make sense */
+	case DATA_CHANNEL_RELIABLE_STREAM:
+		pr_policy = SCTP_PR_SCTP_NONE;
+		break;
+	/* XXX Doesn't make sense */
+	case DATA_CHANNEL_UNRELIABLE:
+		pr_policy = SCTP_PR_SCTP_TTL;
+		break;
+	case DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT:
+		pr_policy = SCTP_PR_SCTP_RTX;
+		break;
+	case DATA_CHANNEL_PARTIAL_RELIABLE_TIMED:
+		pr_policy = SCTP_PR_SCTP_TTL;
+		break;
+	default:
+		pr_policy = SCTP_PR_SCTP_NONE;
+		/* XXX error handling */
+		break;
+	}
+	pr_value = ntohs(req->reliability_params);
+	if (ntohs(req->flags) & DATA_CHANNEL_FLAG_OUT_OF_ORDER_ALLOWED) {
+		unordered = 1;
+	} else {
+		unordered = 0;
+	}
+	o_stream = find_free_o_stream(pc);
+	channel->state = DATA_CHANNEL_CONNECTING;
+	channel->unordered = unordered;
+	channel->pr_policy = pr_policy;
+	channel->pr_value = pr_value;
+	channel->i_stream = i_stream;
+	channel->o_stream = o_stream;
+	channel->flags = 0;
+	pc->i_stream_channel[i_stream] = channel;
+	if (o_stream == 0) {
+		request_more_o_streams(pc);
+	} else {
+		if (send_open_response_message(pc->sock, o_stream, i_stream)) {
+			pc->o_stream_channel[o_stream] = channel;
+		} else {
+			if (errno == EAGAIN) {
+				channel->flags |= DATA_CHANNEL_FLAGS_SEND_RSP;
+				pc->o_stream_channel[o_stream] = channel;
+			} else {
+				/* XXX: Signal error to the other end. */
+				pc->i_stream_channel[i_stream] = NULL;
+				channel->state = DATA_CHANNEL_CLOSED;
+				channel->unordered = 0;
+				channel->pr_policy = 0;
+				channel->pr_value = 0;
+				channel->i_stream = 0;
+				channel->o_stream = 0;
+				channel->flags = 0;
+			}
+		}
+	}
+}
+
+static void
+handle_open_response_message(struct peer_connection *pc,
+                             struct rtcweb_datachannel_open_response *rsp,
+                             size_t length, uint16_t i_stream)
+{
+	uint16_t o_stream;
+	struct channel *channel;
+
+	o_stream = ntohs(rsp->reverse_stream);
+	channel = find_channel_by_o_stream(pc, o_stream);
+	if (channel == NULL) {
+		/* XXX: improve error handling */
+		printf("handle_open_response_message: Can't find channel for outgoing steam %d.\n", o_stream);
+		return;
+	}
+	if (channel->state != DATA_CHANNEL_CONNECTING) {
+		/* XXX: improve error handling */
+		printf("handle_open_response_message: Channel with id %d for outgoing steam %d is in state %d.\n", channel->id, o_stream, channel->state);
+		return;
+	}
+	if (find_channel_by_i_stream(pc, i_stream)) {
+		/* XXX: improve error handling */
+		printf("handle_open_response_message: Channel collision for channel with id %d and streams (in/out) = (%d/%d).\n", channel->id, i_stream, o_stream);
+		return;
+	}
+	channel->i_stream = i_stream;
+	channel->state = DATA_CHANNEL_OPEN;
+	pc->i_stream_channel[i_stream] = channel;
+	if (send_open_ack_message(pc->sock, o_stream)) {
+		channel->flags = 0;
+	} else {
+		channel->flags |= DATA_CHANNEL_FLAGS_SEND_ACK;
+	}
+	return;
+}
+
+static void
+handle_open_ack_message(struct peer_connection *pc,
+                        struct rtcweb_datachannel_ack *ack,
+                        size_t length, uint16_t i_stream)
+{
+	struct channel *channel;
+
+	channel = find_channel_by_i_stream(pc, i_stream);
+	if (channel == NULL) {
+		/* XXX: some error handling */
+		return;
+	}
+	if (channel->state == DATA_CHANNEL_OPEN) {
+		return;
+	}
+	if (channel->state != DATA_CHANNEL_CONNECTING) {
+		/* XXX: error handling */
+		return;
+	}
+	channel->state = DATA_CHANNEL_OPEN;
+	return;
+}
+
+static void
+handle_unknown_message(char *msg, size_t length, uint16_t i_stream)
+{
+	/* XXX: Send an error message */
+	return;
+}
+
+static void
+handle_data_message(struct peer_connection *pc,
+                    char *buffer, size_t length, uint16_t i_stream)
+{
+	struct channel *channel;
+
+	channel = find_channel_by_i_stream(pc, i_stream);
+	if (channel == NULL) {
+		/* XXX: Some error handling */
+		return;
+	}
+	if (channel->state == DATA_CHANNEL_CONNECTING) {
+		/* Implicit ACK */
+		channel->state = DATA_CHANNEL_OPEN;
+	}
+	if (channel->state != DATA_CHANNEL_OPEN) {
+		/* XXX: What about other states? */
+		/* XXX: Some error handling */
+		return;
+	} else {
+		/* Assuming DATA_CHANNEL_PPID_DOMSTRING */
+		/* XXX: Protect for non 0 terminated buffer */
+		printf("Message received of length %zu on channel with id %d: %.*s\n",
+		       length, channel->id, (int)length, buffer);
+	}
+	return;
+}
+
+static void
+handle_message(struct peer_connection *pc, char *buffer, size_t length, uint32_t ppid, uint16_t i_stream)
+{
+	struct rtcweb_datachannel_open_request *req;
+	struct rtcweb_datachannel_open_response *rsp;
+	struct rtcweb_datachannel_ack *ack, *msg;
+
+	switch (ppid) {
+	case DATA_CHANNEL_PPID_CONTROL:
+		if (length < sizeof(struct rtcweb_datachannel_ack)) {
+			return;
+		}
+		msg = (struct rtcweb_datachannel_ack *)buffer;
+		switch (msg->msg_type) {
+		case DATA_CHANNEL_OPEN_REQUEST:
+			if (length < sizeof(struct rtcweb_datachannel_open_request)) {
+				/* XXX: error handling? */
+				return;
+			}
+			req = (struct rtcweb_datachannel_open_request *)buffer;
+			handle_open_request_message(pc, req, length, i_stream);
+			break;
+		case DATA_CHANNEL_OPEN_RESPONSE:
+			if (length < sizeof(struct rtcweb_datachannel_open_response)) {
+				/* XXX: error handling? */
+				return;
+			}
+			rsp = (struct rtcweb_datachannel_open_response *)buffer;
+			handle_open_response_message(pc, rsp, length, i_stream);
+			break;
+		case DATA_CHANNEL_ACK:
+			if (length < sizeof(struct rtcweb_datachannel_ack)) {
+				/* XXX: error handling? */
+				return;
+			}
+			ack = (struct rtcweb_datachannel_ack *)buffer;
+			handle_open_ack_message(pc, ack, length, i_stream);
+			break;
+		default:
+			handle_unknown_message(buffer, length, i_stream);
+			break;
+		}
+		break;
+	case DATA_CHANNEL_PPID_DOMSTRING:
+	case DATA_CHANNEL_PPID_BINARY:
+		handle_data_message(pc, buffer, length, i_stream);
+		break;
+	default:
+		printf("Message of length %zu, PPID %u on stream %u received.\n",
+		       length, ppid, i_stream);
+		break;
+	}
+}
+
+static void
+handle_association_change_event(struct sctp_assoc_change *sac)
+{
+	unsigned int i, n;
+
+	printf("Association change ");
+	switch (sac->sac_state) {
+	case SCTP_COMM_UP:
+		printf("SCTP_COMM_UP");
+		break;
+	case SCTP_COMM_LOST:
+		printf("SCTP_COMM_LOST");
+		break;
+	case SCTP_RESTART:
+		printf("SCTP_RESTART");
+		break;
+	case SCTP_SHUTDOWN_COMP:
+		printf("SCTP_SHUTDOWN_COMP");
+		break;
+	case SCTP_CANT_STR_ASSOC:
+		printf("SCTP_CANT_STR_ASSOC");
+		break;
+	default:
+		printf("UNKNOWN");
+		break;
+	}
+	printf(", streams (in/out) = (%u/%u)",
+	       sac->sac_inbound_streams, sac->sac_outbound_streams);
+	n = sac->sac_length - sizeof(struct sctp_assoc_change);
+	if (((sac->sac_state == SCTP_COMM_UP) ||
+	     (sac->sac_state == SCTP_RESTART)) && (n > 0)) {
+		printf(", supports");
+		for (i = 0; i < n; i++) {
+			switch (sac->sac_info[i]) {
+			case SCTP_ASSOC_SUPPORTS_PR:
+				printf(" PR");
+				break;
+			case SCTP_ASSOC_SUPPORTS_AUTH:
+				printf(" AUTH");
+				break;
+			case SCTP_ASSOC_SUPPORTS_ASCONF:
+				printf(" ASCONF");
+				break;
+			case SCTP_ASSOC_SUPPORTS_MULTIBUF:
+				printf(" MULTIBUF");
+				break;
+			case SCTP_ASSOC_SUPPORTS_RE_CONFIG:
+				printf(" RE-CONFIG");
+				break;
+			default:
+				printf(" UNKNOWN(0x%02x)", sac->sac_info[i]);
+				break;
+			}
+		}
+	} else if (((sac->sac_state == SCTP_COMM_LOST) ||
+	            (sac->sac_state == SCTP_CANT_STR_ASSOC)) && (n > 0)) {
+		printf(", ABORT =");
+		for (i = 0; i < n; i++) {
+			printf(" 0x%02x", sac->sac_info[i]);
+		}
+	}
+	printf(".\n");
+	if ((sac->sac_state == SCTP_CANT_STR_ASSOC) ||
+	    (sac->sac_state == SCTP_SHUTDOWN_COMP) ||
+	    (sac->sac_state == SCTP_COMM_LOST)) {
+		exit(0);
+	}
+	return;
+}
+
+static void
+handle_peer_address_change_event(struct sctp_paddr_change *spc)
+{
+	char addr_buf[INET6_ADDRSTRLEN];
+	const char *addr;
+	struct sockaddr_in *sin;
+	struct sockaddr_in6 *sin6;
+
+	switch (spc->spc_aaddr.ss_family) {
+	case AF_INET:
+		sin = (struct sockaddr_in *)&spc->spc_aaddr;
+		addr = inet_ntop(AF_INET, &sin->sin_addr, addr_buf, INET_ADDRSTRLEN);
+		break;
+	case AF_INET6:
+		sin6 = (struct sockaddr_in6 *)&spc->spc_aaddr;
+		addr = inet_ntop(AF_INET6, &sin6->sin6_addr, addr_buf, INET6_ADDRSTRLEN);
+		break;
+	default:
+#ifdef _WIN32
+		_snprintf(addr_buf, INET6_ADDRSTRLEN, "Unknown family %d", spc->spc_aaddr.ss_family);
+#else
+		snprintf(addr_buf, INET6_ADDRSTRLEN, "Unknown family %d", spc->spc_aaddr.ss_family);
+#endif
+		addr = addr_buf;
+		break;
+	}
+	printf("Peer address %s is now ", addr);
+	switch (spc->spc_state) {
+	case SCTP_ADDR_AVAILABLE:
+		printf("SCTP_ADDR_AVAILABLE");
+		break;
+	case SCTP_ADDR_UNREACHABLE:
+		printf("SCTP_ADDR_UNREACHABLE");
+		break;
+	case SCTP_ADDR_REMOVED:
+		printf("SCTP_ADDR_REMOVED");
+		break;
+	case SCTP_ADDR_ADDED:
+		printf("SCTP_ADDR_ADDED");
+		break;
+	case SCTP_ADDR_MADE_PRIM:
+		printf("SCTP_ADDR_MADE_PRIM");
+		break;
+	case SCTP_ADDR_CONFIRMED:
+		printf("SCTP_ADDR_CONFIRMED");
+		break;
+	default:
+		printf("UNKNOWN");
+		break;
+	}
+	printf(" (error = 0x%08x).\n", spc->spc_error);
+	return;
+}
+
+static void
+handle_adaptation_indication(struct sctp_adaptation_event *sai)
+{
+	printf("Adaptation indication: %x.\n", sai-> sai_adaptation_ind);
+	return;
+}
+
+static void
+handle_shutdown_event(struct sctp_shutdown_event *sse)
+{
+	printf("Shutdown event.\n");
+	/* XXX: notify all channels. */
+	return;
+}
+
+static void
+handle_stream_reset_event(struct peer_connection *pc, struct sctp_stream_reset_event *strrst)
+{
+	uint32_t n, i;
+	struct channel *channel;
+
+	n = (strrst->strreset_length - sizeof(struct sctp_stream_reset_event)) / sizeof(uint16_t);
+	printf("Stream reset event: flags = %x, ", strrst->strreset_flags);
+	if (strrst->strreset_flags & SCTP_STREAM_RESET_INCOMING_SSN) {
+		if (strrst->strreset_flags & SCTP_STREAM_RESET_OUTGOING_SSN) {
+			printf("incoming/");
+		}
+		printf("incoming ");
+	}
+	if (strrst->strreset_flags & SCTP_STREAM_RESET_OUTGOING_SSN) {
+		printf("outgoing ");
+	}
+	printf("stream ids = ");
+	for (i = 0; i < n; i++) {
+		if (i > 0) {
+			printf(", ");
+		}
+		printf("%d", strrst->strreset_stream_list[i]);
+	}
+	printf(".\n");
+	if (!(strrst->strreset_flags & SCTP_STREAM_RESET_DENIED) &&
+	    !(strrst->strreset_flags & SCTP_STREAM_RESET_FAILED)) {
+		for (i = 0; i < n; i++) {
+			if (strrst->strreset_flags & SCTP_STREAM_RESET_INCOMING_SSN) {
+				channel = find_channel_by_i_stream(pc, strrst->strreset_stream_list[i]);
+				if (channel != NULL) {
+					pc->i_stream_channel[channel->i_stream] = NULL;
+					channel->i_stream = 0;
+					if (channel->o_stream == 0) {
+						channel->pr_policy = SCTP_PR_SCTP_NONE;
+						channel->pr_value = 0;
+						channel->unordered = 0;
+						channel->flags = 0;
+						channel->state = DATA_CHANNEL_CLOSED;
+					} else {
+						if (channel->state == DATA_CHANNEL_OPEN) {
+							reset_outgoing_stream(pc, channel->o_stream);
+							channel->state = DATA_CHANNEL_CLOSING;
+						} else {
+							/* XXX: What to do? */
+						}
+					}
+				}
+			}
+			if (strrst->strreset_flags & SCTP_STREAM_RESET_OUTGOING_SSN) {
+				channel = find_channel_by_o_stream(pc, strrst->strreset_stream_list[i]);
+				if (channel != NULL) {
+					pc->o_stream_channel[channel->o_stream] = NULL;
+					channel->o_stream = 0;
+					if (channel->i_stream == 0) {
+						channel->pr_policy = SCTP_PR_SCTP_NONE;
+						channel->pr_value = 0;
+						channel->unordered = 0;
+						channel->flags = 0;
+						channel->state = DATA_CHANNEL_CLOSED;
+					}
+				}
+			}
+		}
+	}
+	return;
+}
+
+static void
+handle_stream_change_event(struct peer_connection *pc, struct sctp_stream_change_event *strchg)
+{
+	uint16_t o_stream;
+	uint32_t i;
+	struct channel *channel;
+
+	printf("Stream change event: streams (in/out) = (%u/%u), flags = %x.\n",
+	       strchg->strchange_instrms, strchg->strchange_outstrms, strchg->strchange_flags);
+	for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
+		channel = &(pc->channels[i]);
+		if ((channel->state == DATA_CHANNEL_CONNECTING) &&
+		    (channel->o_stream == 0)) {
+			if ((strchg->strchange_flags & SCTP_STREAM_CHANGE_DENIED) ||
+			    (strchg->strchange_flags & SCTP_STREAM_CHANGE_FAILED)) {
+				/* XXX: Signal to the other end. */
+				if (channel->i_stream != 0) {
+					pc->i_stream_channel[channel->i_stream] = NULL;
+				}
+				channel->unordered = 0;
+				channel->pr_policy = SCTP_PR_SCTP_NONE;
+				channel->pr_value = 0;
+				channel->i_stream = 0;
+				channel->o_stream = 0;
+				channel->flags = 0;
+				channel->state = DATA_CHANNEL_CLOSED;
+			} else {
+				o_stream = find_free_o_stream(pc);
+				if (o_stream != 0) {
+					channel->o_stream = o_stream;
+					pc->o_stream_channel[o_stream] = channel;
+					if (channel->i_stream == 0) {
+						channel->flags |= DATA_CHANNEL_FLAGS_SEND_REQ;
+					} else {
+						channel->flags |= DATA_CHANNEL_FLAGS_SEND_RSP;
+					}
+				} else {
+					/* We will not find more ... */
+					break;
+				}
+			}
+		}
+	}
+	return;
+}
+
+static void
+handle_remote_error_event(struct sctp_remote_error *sre)
+{
+	size_t i, n;
+
+	n = sre->sre_length - sizeof(struct sctp_remote_error);
+	printf("Remote Error (error = 0x%04x): ", sre->sre_error);
+	for (i = 0; i < n; i++) {
+		printf(" 0x%02x", sre-> sre_data[i]);
+	}
+	printf(".\n");
+	return;
+}
+
+static void
+handle_send_failed_event(struct sctp_send_failed_event *ssfe)
+{
+	size_t i, n;
+
+	if (ssfe->ssfe_flags & SCTP_DATA_UNSENT) {
+		printf("Unsent ");
+	}
+	if (ssfe->ssfe_flags & SCTP_DATA_SENT) {
+		printf("Sent ");
+	}
+	if (ssfe->ssfe_flags & ~(SCTP_DATA_SENT | SCTP_DATA_UNSENT)) {
+		printf("(flags = %x) ", ssfe->ssfe_flags);
+	}
+	printf("message with PPID = %d, SID = %d, flags: 0x%04x due to error = 0x%08x",
+	       ntohl(ssfe->ssfe_info.snd_ppid), ssfe->ssfe_info.snd_sid,
+	       ssfe->ssfe_info.snd_flags, ssfe->ssfe_error);
+	n = ssfe->ssfe_length - sizeof(struct sctp_send_failed_event);
+	for (i = 0; i < n; i++) {
+		printf(" 0x%02x", ssfe->ssfe_data[i]);
+	}
+	printf(".\n");
+	return;
+}
+
+static void
+handle_notification(struct peer_connection *pc, union sctp_notification *notif, size_t n)
+{
+	if (notif->sn_header.sn_length != (uint32_t)n) {
+		return;
+	}
+	switch (notif->sn_header.sn_type) {
+	case SCTP_ASSOC_CHANGE:
+		handle_association_change_event(&(notif->sn_assoc_change));
+		break;
+	case SCTP_PEER_ADDR_CHANGE:
+		handle_peer_address_change_event(&(notif->sn_paddr_change));
+		break;
+	case SCTP_REMOTE_ERROR:
+		handle_remote_error_event(&(notif->sn_remote_error));
+		break;
+	case SCTP_SHUTDOWN_EVENT:
+		handle_shutdown_event(&(notif->sn_shutdown_event));
+		break;
+	case SCTP_ADAPTATION_INDICATION:
+		handle_adaptation_indication(&(notif->sn_adaptation_event));
+		break;
+	case SCTP_PARTIAL_DELIVERY_EVENT:
+		break;
+	case SCTP_AUTHENTICATION_EVENT:
+		break;
+	case SCTP_SENDER_DRY_EVENT:
+		break;
+	case SCTP_NOTIFICATIONS_STOPPED_EVENT:
+		break;
+	case SCTP_SEND_FAILED_EVENT:
+		handle_send_failed_event(&(notif->sn_send_failed_event));
+		break;
+	case SCTP_STREAM_RESET_EVENT:
+		handle_stream_reset_event(pc, &(notif->sn_strreset_event));
+		send_deferred_messages(pc);
+		send_outgoing_stream_reset(pc);
+		request_more_o_streams(pc);
+		break;
+	case SCTP_ASSOC_RESET_EVENT:
+		break;
+	case SCTP_STREAM_CHANGE_EVENT:
+		handle_stream_change_event(pc, &(notif->sn_strchange_event));
+		send_deferred_messages(pc);
+		send_outgoing_stream_reset(pc);
+		request_more_o_streams(pc);
+		break;
+	default:
+		break;
+	}
+}
+
+static void
+print_status(struct peer_connection *pc)
+{
+	struct sctp_status status;
+	socklen_t len;
+	uint32_t i;
+	struct channel *channel;
+
+	len = (socklen_t)sizeof(struct sctp_status);
+	if (usrsctp_getsockopt(pc->sock, IPPROTO_SCTP, SCTP_STATUS, &status, &len) < 0) {
+		perror("getsockopt");
+		return;
+	}
+	printf("Association state: ");
+	switch (status.sstat_state) {
+	case SCTP_CLOSED:
+		printf("CLOSED\n");
+		break;
+	case SCTP_BOUND:
+		printf("BOUND\n");
+		break;
+	case SCTP_LISTEN:
+		printf("LISTEN\n");
+		break;
+	case SCTP_COOKIE_WAIT:
+		printf("COOKIE_WAIT\n");
+		break;
+	case SCTP_COOKIE_ECHOED:
+		printf("COOKIE_ECHOED\n");
+		break;
+	case SCTP_ESTABLISHED:
+		printf("ESTABLISHED\n");
+		break;
+	case SCTP_SHUTDOWN_PENDING:
+		printf("SHUTDOWN_PENDING\n");
+		break;
+	case SCTP_SHUTDOWN_SENT:
+		printf("SHUTDOWN_SENT\n");
+		break;
+	case SCTP_SHUTDOWN_RECEIVED:
+		printf("SHUTDOWN_RECEIVED\n");
+		break;
+	case SCTP_SHUTDOWN_ACK_SENT:
+		printf("SHUTDOWN_ACK_SENT\n");
+		break;
+	default:
+		printf("UNKNOWN\n");
+		break;
+	}
+	printf("Number of streams (i/o) = (%u/%u)\n",
+	       status.sstat_instrms, status.sstat_outstrms);
+	for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
+		channel = &(pc->channels[i]);
+		if (channel->state == DATA_CHANNEL_CLOSED) {
+			continue;
+		}
+		printf("Channel with id = %u: state ", channel->id);
+		switch (channel->state) {
+		case DATA_CHANNEL_CLOSED:
+			printf("CLOSED");
+			break;
+		case DATA_CHANNEL_CONNECTING:
+			printf("CONNECTING");
+			break;
+		case DATA_CHANNEL_OPEN:
+			printf("OPEN");
+			break;
+		case DATA_CHANNEL_CLOSING:
+			printf("CLOSING");
+			break;
+		default:
+			printf("UNKNOWN(%d)", channel->state);
+			break;
+		}
+		printf(", flags = 0x%08x, stream id (in/out): (%u/%u), ",
+		       channel->flags,
+		       channel->i_stream,
+		       channel->o_stream);
+		if (channel->unordered) {
+			printf("unordered, ");
+		} else {
+			printf("ordered, ");
+		}
+		switch (channel->pr_policy) {
+		case SCTP_PR_SCTP_NONE:
+			printf("reliable.\n");
+			break;
+		case SCTP_PR_SCTP_TTL:
+			printf("unreliable (timeout %ums).\n", channel->pr_value);
+			break;
+		case SCTP_PR_SCTP_RTX:
+			printf("unreliable (max. %u rtx).\n", channel->pr_value);
+			break;
+		default:
+			printf("unkown policy %u.\n", channel->pr_policy);
+			break;
+		}
+	}
+}
+
+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)
+{
+	struct peer_connection *pc;
+
+	pc = (struct peer_connection *)ulp_info;
+
+	if (data) {
+		lock_peer_connection(pc);
+		if (flags & MSG_NOTIFICATION) {
+			handle_notification(pc, (union sctp_notification *)data, datalen);
+		} else {
+			handle_message(pc, data, datalen, ntohl(rcv.rcv_ppid), rcv.rcv_sid);
+		}
+		unlock_peer_connection(pc);
+	}
+	return (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;
+	struct sockaddr_in addr;
+	socklen_t addr_len;
+	char line[LINE_LENGTH + 1];
+	unsigned int unordered, policy, value, id, seconds;
+	unsigned int i;
+	struct channel *channel;
+	const int on = 1;
+	struct sctp_assoc_value av;
+	struct sctp_event event;
+	struct sctp_udpencaps encaps;
+	struct sctp_initmsg initmsg;
+	uint16_t event_types[] = {SCTP_ASSOC_CHANGE,
+	                          SCTP_PEER_ADDR_CHANGE,
+	                          SCTP_REMOTE_ERROR,
+	                          SCTP_SHUTDOWN_EVENT,
+	                          SCTP_ADAPTATION_INDICATION,
+	                          SCTP_SEND_FAILED_EVENT,
+	                          SCTP_STREAM_RESET_EVENT,
+	                          SCTP_STREAM_CHANGE_EVENT};
+	char addrbuf[INET_ADDRSTRLEN];
+
+	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, receive_cb, NULL, 0, &peer_connection)) == NULL) {
+		perror("socket");
+	}
+	init_peer_connection(&peer_connection);
+	if (argc > 2) {
+		memset(&encaps, 0, sizeof(struct sctp_udpencaps));
+		encaps.sue_address.ss_family = AF_INET6;
+		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");
+		}
+	}
+	if (usrsctp_setsockopt(sock, IPPROTO_SCTP, SCTP_RECVRCVINFO, &on, sizeof(int)) < 0) {
+		perror("setsockopt SCTP_RECVRCVINFO");
+	}
+	if (usrsctp_setsockopt(sock, IPPROTO_SCTP, SCTP_EXPLICIT_EOR, &on, sizeof(int)) < 0) {
+		perror("setsockopt SCTP_EXPLICIT_EOR");
+	}
+	/* Allow resetting streams. */
+	av.assoc_id = SCTP_ALL_ASSOC;
+	av.assoc_value = SCTP_ENABLE_RESET_STREAM_REQ | SCTP_ENABLE_CHANGE_ASSOC_REQ;
+	if (usrsctp_setsockopt(sock, IPPROTO_SCTP, SCTP_ENABLE_STREAM_RESET, &av, sizeof(struct sctp_assoc_value)) < 0) {
+		perror("setsockopt SCTP_ENABLE_STREAM_RESET");
+	}
+	/* Enable the events of interest. */
+	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(sock, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(event)) < 0) {
+			perror("setsockopt SCTP_EVENT");
+		}
+	}
+	memset(&initmsg, 0, sizeof(struct sctp_initmsg));
+	initmsg.sinit_num_ostreams = 5;
+	initmsg.sinit_max_instreams = 65535;
+	if (usrsctp_setsockopt(sock, IPPROTO_SCTP, SCTP_INITMSG, &initmsg, sizeof(struct sctp_initmsg)) < 0) {
+		perror("setsockopt SCTP_INITMSG");
+	}
+
+	if (argc == 5) {
+		/* operating as client */
+		memset(&addr, 0, sizeof(struct sockaddr_in));
+		addr.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+		addr.sin_len = sizeof(struct sockaddr_in);
+#endif
+		if (!inet_pton(AF_INET, argv[3], &addr.sin_addr.s_addr)){
+			printf("error: invalid address\n");
+			exit(1);
+		}
+		addr.sin_port = htons(atoi(argv[4]));
+		if (usrsctp_connect(sock, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) < 0) {
+			perror("connect");
+		}
+
+		printf("Connected to %s:%d.\n", inet_ntop(AF_INET, &(addr.sin_addr), addrbuf, INET_ADDRSTRLEN), ntohs(addr.sin_port));
+	} else if (argc == 4) {
+		struct socket *conn_sock;
+
+		/* operating as server */
+		memset(&addr, 0, sizeof(struct sockaddr_in));
+		addr.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+		addr.sin_len = sizeof(struct sockaddr_in);
+#endif
+		addr.sin_addr.s_addr = INADDR_ANY;
+		addr.sin_port = htons(atoi(argv[3]));
+		if (usrsctp_bind(sock, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) < 0) {
+			perror("bind");
+		}
+		if (usrsctp_listen(sock, 1) < 0) {
+			perror("listen");
+		}
+		addr_len = (socklen_t)sizeof(struct sockaddr_in);
+		memset(&addr, 0, sizeof(struct sockaddr_in));
+		if ((conn_sock = usrsctp_accept(sock, (struct sockaddr *)&addr, &addr_len)) == NULL) {
+			perror("accept");
+		}
+		usrsctp_close(sock);
+		sock = conn_sock;
+		printf("Connected to %s:%d.\n", inet_ntop(AF_INET, &(addr.sin_addr), addrbuf, INET_ADDRSTRLEN), ntohs(addr.sin_port));
+	} else {
+		printf("Usage: %s local_udp_port remote_udp_port local_port when operating as server\n"
+		       "       %s local_udp_port remote_udp_port remote_addr remote_port when operating as client\n",
+		       argv[0], argv[0]);
+		return (0);
+	}
+
+	lock_peer_connection(&peer_connection);
+	peer_connection.sock = sock;
+	unlock_peer_connection(&peer_connection);
+
+	for (;;) {
+#ifdef _WIN32
+		if (gets_s(line, LINE_LENGTH) == NULL) {
+#else
+		if (fgets(line, LINE_LENGTH, stdin) == NULL) {
+#endif
+			if (usrsctp_shutdown(sock, SHUT_WR) < 0) {
+				perror("usrsctp_shutdown");
+			}
+			while (usrsctp_finish() != 0) {
+#ifdef _WIN32
+				Sleep(1000);
+#else
+				sleep(1);
+#endif
+			}
+			break;
+		}
+		if (strncmp(line, "?", strlen("?")) == 0 ||
+		    strncmp(line, "help", strlen("help")) == 0) {
+			printf("Commands:\n"
+			       "open unordered pr_policy pr_value - opens a channel\n"
+			       "close channel - closes the channel\n"
+			       "send channel:string - sends string using channel\n"
+			       "status - prints the status\n"
+			       "sleep n - sleep for n seconds\n"
+			       "help - this message\n");
+		} else if (strncmp(line, "status", strlen("status")) == 0) {
+			lock_peer_connection(&peer_connection);
+			print_status(&peer_connection);
+			unlock_peer_connection(&peer_connection);
+		} else if (strncmp(line, "quit", strlen("quit")) == 0) {
+			if (usrsctp_shutdown(sock, SHUT_WR) < 0) {
+				perror("usrsctp_shutdown");
+			}
+			while (usrsctp_finish() != 0) {
+#ifdef _WIN32
+				Sleep(1000);
+#else
+				sleep(1);
+#endif
+			}
+			break;
+		} else if (sscanf(line, "open %u %u %u", &unordered, &policy, &value) == 3) {
+			lock_peer_connection(&peer_connection);
+			channel = open_channel(&peer_connection, (uint8_t)unordered, (uint16_t)policy, (uint32_t)value);
+			unlock_peer_connection(&peer_connection);
+			if (channel == NULL) {
+				printf("Creating channel failed.\n");
+			} else {
+				printf("Channel with id %u created.\n", channel->id);
+			}
+		} else if (sscanf(line, "close %u", &id) == 1) {
+			if (id < NUMBER_OF_CHANNELS) {
+				lock_peer_connection(&peer_connection);
+				close_channel(&peer_connection, &peer_connection.channels[id]);
+				unlock_peer_connection(&peer_connection);
+			}
+		} else if (sscanf(line, "send %u", &id) == 1) {
+			if (id < NUMBER_OF_CHANNELS) {
+				char *msg;
+
+				msg = strstr(line, ":");
+				if (msg) {
+					msg++;
+					lock_peer_connection(&peer_connection);
+#ifdef _WIN32
+					if (send_user_message(&peer_connection, &peer_connection.channels[id], msg, strlen(msg))) {
+#else
+					if (send_user_message(&peer_connection, &peer_connection.channels[id], msg, strlen(msg) - 1)) {
+#endif
+						printf("Message sent.\n");
+					} else {
+						printf("Message sending failed.\n");
+					}
+					unlock_peer_connection(&peer_connection);
+				}
+			}
+		} else if (sscanf(line, "sleep %u", &seconds) == 1) {
+#ifdef _WIN32
+			Sleep(seconds * 1000);
+#else
+			sleep(seconds);
+#endif
+		} else {
+			printf("Unknown command: %s", line);
+		}
+	}
+	return (0);
+}