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rtcweb.c
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rtcweb.c
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/*-
* 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
*/
#ifdef _WIN32
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#ifndef _WIN32
#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>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#include <crtdbg.h>
#endif
#include <usrsctp.h>
#include "programs_helper.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
#if defined(_WIN32) && !defined(__MINGW32__)
#pragma warning( push )
#pragma warning( disable : 4200 )
#endif /* defined(_WIN32) && !defined(__MINGW32__) */
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;
#if defined(_WIN32) && !defined(__MINGW32__)
#pragma warning( pop )
#endif /* defined(_WIN32) && !defined(__MINGW32__) */
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(pop)
#endif
#undef SCTP_PACKED
static void
lock_peer_connection(struct peer_connection *);
static void
unlock_peer_connection(struct peer_connection *);
static void
init_peer_connection(struct peer_connection *pc)
{
uint32_t i;
struct channel *channel;
#ifdef _WIN32
InitializeCriticalSection(&(pc->mutex));
#else
pthread_mutex_init(&pc->mutex, NULL);
#endif
lock_peer_connection(pc);
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;
unlock_peer_connection(pc);
}
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 error 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 %u is in state %u 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 %u for outgoing steam %u is in state %u.\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 %u and streams (in/out) = (%u/%u).\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 %u: %.*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;
case SCTP_ASSOC_SUPPORTS_INTERLEAVING:
printf(" INTERLEAVING");
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
if (_snprintf(addr_buf, INET6_ADDRSTRLEN, "Unknown family %d", spc->spc_aaddr.ss_family) < 0) {
#else
if (snprintf(addr_buf, INET6_ADDRSTRLEN, "Unknown family %d", spc->spc_aaddr.ss_family) < 0) {
#endif
addr_buf[0] = '\0';
}
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 ");
}