toxcore/toxav/msi.c

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/** msi.c
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*
* Copyright (C) 2013-2015 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
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#include "../toxcore/logger.h"
#include "../toxcore/util.h"
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#include "msi.h"
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#include <unistd.h>
#include <string.h>
#include <stdlib.h>
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#include <stdbool.h>
#include <assert.h>
#define MSI_MAXMSG_SIZE 256
/**
* Protocol:
*
* |id [1 byte]| |size [1 byte]| |data [$size bytes]| |...{repeat}| |0 {end byte}|
*/
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typedef enum {
IDRequest = 1,
IDError,
IDCapabilities,
IDVFPSZ,
} MSIHeaderID;
typedef enum {
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requ_push,
requ_pop,
} MSIRequest;
#define GENERIC_HEADER(header, val_type) \
typedef struct { \
val_type value; \
bool exists; \
} MSIHeader##header
GENERIC_HEADER ( Request, MSIRequest );
GENERIC_HEADER ( Error, MSIError );
GENERIC_HEADER ( Capabilities, uint8_t );
GENERIC_HEADER ( VFPSZ, uint16_t );
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typedef struct {
MSIHeaderRequest request;
MSIHeaderError error;
MSIHeaderCapabilities capabilities;
MSIHeaderVFPSZ vfpsz; /* Video frame piece size. NOTE: Value must be in network b-order */
} MSIMessage;
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void msg_init (MSIMessage *dest, MSIRequest request);
int msg_parse_in ( MSIMessage *dest, const uint8_t *data, uint16_t length );
uint8_t *msg_parse_header_out ( MSIHeaderID id, uint8_t *dest, const void *value, uint8_t value_len, uint16_t *length );
int send_message ( Messenger* m, uint32_t friend_id, const MSIMessage *msg );
int send_error ( Messenger* m, uint32_t friend_id, MSIError error );
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static int invoke_callback(MSICall* call, MSICallbackID cb);
static MSICall *get_call ( MSISession *session, uint32_t friend_id );
MSICall *new_call ( MSISession *session, uint32_t friend_id );
void kill_call ( MSICall *call );
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void on_peer_status(Messenger *m, uint32_t friend_id, uint8_t status, void *data);
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void handle_push ( MSICall *call, const MSIMessage *msg );
void handle_pop ( MSICall *call, const MSIMessage *msg );
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void handle_msi_packet ( Messenger *m, uint32_t friend_id, const uint8_t *data, uint16_t length, void *object );
/**
* Public functions
*/
void msi_register_callback ( MSISession *session, MSICallbackType callback, MSICallbackID id)
{
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LOGGED_LOCK(session->mutex);
session->callbacks[id] = callback;
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LOGGED_UNLOCK(session->mutex);
}
MSISession *msi_new ( Messenger *messenger )
{
if (messenger == NULL) {
LOGGER_ERROR("Could not init session on empty messenger!");
return NULL;
}
MSISession *retu = calloc ( sizeof ( MSISession ), 1 );
if (retu == NULL) {
LOGGER_ERROR("Allocation failed! Program might misbehave!");
return NULL;
}
if (create_recursive_mutex(retu->mutex) != 0) {
LOGGER_ERROR("Failed to init mutex! Program might misbehave");
free(retu);
return NULL;
}
retu->messenger = messenger;
m_callback_msi_packet(messenger, handle_msi_packet, retu );
/* This is called when remote terminates session */
m_callback_connectionstatus_internal_av(messenger, on_peer_status, retu);
LOGGER_DEBUG("New msi session: %p ", retu);
return retu;
}
int msi_kill ( MSISession *session )
{
if (session == NULL) {
LOGGER_ERROR("Tried to terminate non-existing session");
return -1;
}
m_callback_msi_packet((struct Messenger *) session->messenger, NULL, NULL);
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LOGGED_LOCK(session->mutex);
if (session->calls) {
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MSIMessage msg;
msg_init(&msg, requ_pop);
MSICall* it = get_call(session, session->calls_head);
for (; it; it = it->next) {
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send_message(session->messenger, it->friend_id, &msg);
kill_call(it); /* This will eventually free session->calls */
}
}
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LOGGED_UNLOCK(session->mutex);
pthread_mutex_destroy(session->mutex);
LOGGER_DEBUG("Terminated session: %p", session);
free ( session );
return 0;
}
int msi_invite ( MSISession *session, MSICall **call, uint32_t friend_id, uint8_t capabilities )
{
LOGGER_DEBUG("Session: %p Inviting friend: %u", session, friend_id);
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LOGGED_LOCK(session->mutex);
if (get_call(session, friend_id) != NULL) {
LOGGER_ERROR("Already in a call");
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LOGGED_UNLOCK(session->mutex);
return -1;
}
(*call) = new_call ( session, friend_id );
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if ( *call == NULL ) {
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LOGGED_UNLOCK(session->mutex);
return -1;
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}
(*call)->self_capabilities = capabilities;
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MSIMessage msg;
msg_init(&msg, requ_push);
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msg.capabilities.exists = true;
msg.capabilities.value = capabilities;
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msg.vfpsz.exists = true;
msg.vfpsz.value = htons(VIDEOFRAME_PIECE_SIZE);
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send_message ( (*call)->session->messenger, (*call)->friend_id, &msg );
(*call)->state = msi_CallRequesting;
LOGGER_DEBUG("Invite sent");
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LOGGED_UNLOCK(session->mutex);
return 0;
}
int msi_hangup ( MSICall* call )
{
LOGGER_DEBUG("Session: %p Hanging up call with friend: %u", call->session, call->friend_id);
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MSISession* session = call->session;
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LOGGED_LOCK(session->mutex);
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MSIMessage msg;
msg_init(&msg, requ_pop);
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send_message ( session->messenger, call->friend_id, &msg );
kill_call(call);
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LOGGED_UNLOCK(session->mutex);
return 0;
}
int msi_answer ( MSICall* call, uint8_t capabilities )
{
LOGGER_DEBUG("Session: %p Answering call from: %u", call->session, call->friend_id);
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MSISession* session = call->session;
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LOGGED_LOCK(session->mutex);
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if ( call->state != msi_CallRequested ) {
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/* Though sending in invalid state will not cause anything wierd
* Its better to not do it like a maniac */
LOGGER_ERROR("Call is in invalid state!");
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LOGGED_UNLOCK(session->mutex);
return -1;
}
call->self_capabilities = capabilities;
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MSIMessage msg;
msg_init(&msg, requ_push);
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msg.capabilities.exists = true;
msg.capabilities.value = capabilities;
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msg.vfpsz.exists = true;
msg.vfpsz.value = htons(VIDEOFRAME_PIECE_SIZE);
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send_message ( session->messenger, call->friend_id, &msg );
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call->state = msi_CallActive;
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LOGGED_UNLOCK(session->mutex);
return 0;
}
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int msi_change_capabilities( MSICall* call, uint8_t capabilities )
{
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LOGGER_DEBUG("Session: %p Trying to change capabilities to friend %u", call->session, call->friend_id);
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MSISession* session = call->session;
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LOGGED_LOCK(session->mutex);
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if ( call->state != msi_CallActive ) {
/* Sending capabilities change can cause error on other side if
* the call is not active since we don't send header 'vfpsz'.
* If we were to send 'vfpsz' while call is active it would be
* ignored. However, if call is not active peer will expect
* the said header on 'push' so that it could handle the call
* like new. TODO: explain this better
*/
LOGGER_ERROR("Call is in invalid state!");
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LOGGED_UNLOCK(session->mutex);
return -1;
}
call->self_capabilities = capabilities;
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MSIMessage msg;
msg_init(&msg, requ_push);
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msg.capabilities.exists = true;
msg.capabilities.value = capabilities;
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send_message ( call->session->messenger, call->friend_id, &msg );
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LOGGED_UNLOCK(session->mutex);
return 0;
}
/**
* Private functions
*/
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void msg_init(MSIMessage* dest, MSIRequest request)
{
memset(dest, 0, sizeof(*dest));
dest->request.exists = true;
dest->request.value = request;
}
int msg_parse_in ( MSIMessage *dest, const uint8_t *data, uint16_t length )
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{
/* Parse raw data received from socket into MSIMessage struct */
#define CHECK_SIZE(bytes, constraint, size) \
if ((constraint -= (2 + size)) < 1) { LOGGER_ERROR("Read over length!"); return -1; } \
if ( bytes[1] != size ) { LOGGER_ERROR("Invalid data size!"); return -1; }
#define CHECK_ENUM_HIGH(bytes, enum_high) /* Assumes size == 1 */ \
if ( bytes[2] > enum_high ) { LOGGER_ERROR("Failed enum high limit!"); return -1; }
#define SET_UINT8(bytes, header) do { \
header.value = bytes[2]; \
header.exists = true; \
bytes += 3; \
} while(0)
#define SET_UINT16(bytes, header) do { \
memcpy(&header.value, bytes + 2, 2);\
header.exists = true; \
bytes += 4; \
} while(0)
assert(dest);
if ( length == 0 || data[length - 1] ) { /* End byte must have value 0 */
LOGGER_ERROR("Invalid end byte");
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return -1;
}
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memset(dest, 0, sizeof(*dest));
const uint8_t *it = data;
int size_constraint = length;
while ( *it ) {/* until end byte is hit */
switch (*it) {
case IDRequest:
CHECK_SIZE(it, size_constraint, 1);
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CHECK_ENUM_HIGH(it, requ_pop);
SET_UINT8(it, dest->request);
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break;
case IDError:
CHECK_SIZE(it, size_constraint, 1);
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CHECK_ENUM_HIGH(it, msi_EUndisclosed);
SET_UINT8(it, dest->error);
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break;
case IDCapabilities:
CHECK_SIZE(it, size_constraint, 1);
SET_UINT8(it, dest->capabilities);
break;
case IDVFPSZ:
CHECK_SIZE(it, size_constraint, 2);
SET_UINT16(it, dest->vfpsz);
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break;
default:
LOGGER_ERROR("Invalid id byte");
return -1;
break;
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}
}
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if (dest->request.exists == false) {
LOGGER_ERROR("Invalid request field!");
return -1;
}
return 0;
#undef CHECK_SIZE
#undef CHECK_ENUM_HIGH
#undef SET_UINT8
#undef SET_UINT16
}
uint8_t *msg_parse_header_out ( MSIHeaderID id, uint8_t *dest, const void *value, uint8_t value_len, uint16_t *length )
{
/* Parse a single header for sending */
assert(dest);
assert(value);
assert(value_len);
*dest = id;
dest ++;
*dest = value_len;
dest ++;
memcpy(dest, value, value_len);
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*length += (2 + value_len);
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return dest + value_len; /* Set to next position ready to be written */
}
int send_message ( Messenger* m, uint32_t friend_id, const MSIMessage *msg )
{
/* Parse and send message */
assert(m);
uint8_t parsed [MSI_MAXMSG_SIZE];
uint8_t *it = parsed;
uint16_t size = 0;
if (msg->request.exists) {
uint8_t cast = msg->request.value;
it = msg_parse_header_out(IDRequest, it, &cast,
sizeof(cast), &size);
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} else {
LOGGER_DEBUG("Must have request field");
return -1;
}
if (msg->error.exists) {
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uint8_t cast = msg->error.value;
it = msg_parse_header_out(IDError, it, &cast,
sizeof(cast), &size);
}
if (msg->capabilities.exists) {
it = msg_parse_header_out(IDCapabilities, it, &msg->capabilities.value,
sizeof(msg->capabilities.value), &size);
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}
if (msg->vfpsz.exists) {
it = msg_parse_header_out(IDVFPSZ, it, &msg->vfpsz.value,
sizeof(msg->vfpsz.value), &size);
}
if ( it == parsed ) {
LOGGER_WARNING("Parsing message failed; empty message");
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return -1;
}
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*it = 0;
size ++;
if ( m_msi_packet(m, friend_id, parsed, size) ) {
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LOGGER_DEBUG("Sent message");
return 0;
}
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return -1;
}
int send_error ( Messenger* m, uint32_t friend_id, MSIError error )
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{
/* Send error message */
assert(m);
LOGGER_DEBUG("Sending error: %d to friend: %d", error, friend_id);
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MSIMessage msg;
msg_init(&msg, requ_pop);
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msg.error.exists = true;
msg.error.value = error;
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send_message ( m, friend_id, &msg );
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return 0;
}
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int invoke_callback(MSICall* call, MSICallbackID cb)
{
assert(call);
if ( call->session->callbacks[cb] ) {
LOGGER_DEBUG("Invoking callback function: %d", cb);
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if ( call->session->callbacks[cb] ( call->session->av, call ) != 0 ) {
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LOGGER_WARNING("Callback state handling failed, sending error");
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goto FAILURE;
}
return 0;
}
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FAILURE:
/* If no callback present or error happened while handling,
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* an error message will be sent to friend
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*/
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if (call->error == msi_ENone)
call->error = msi_EHandle;
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return -1;
}
static MSICall *get_call ( MSISession *session, uint32_t friend_id )
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{
assert(session);
if (session->calls == NULL || session->calls_tail < friend_id)
return NULL;
return session->calls[friend_id];
}
MSICall *new_call ( MSISession *session, uint32_t friend_id )
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{
assert(session);
MSICall *rc = calloc(sizeof(MSICall), 1);
if (rc == NULL)
return NULL;
rc->session = session;
rc->friend_id = friend_id;
if (session->calls == NULL) { /* Creating */
session->calls = calloc (sizeof(MSICall*), friend_id + 1);
if (session->calls == NULL) {
free(rc);
return NULL;
}
session->calls_tail = session->calls_head = friend_id;
} else if (session->calls_tail < friend_id) { /* Appending */
void* tmp = realloc(session->calls, sizeof(MSICall*) * friend_id + 1);
if (tmp == NULL) {
free(rc);
return NULL;
}
session->calls = tmp;
/* Set fields in between to null */
int32_t i = session->calls_tail;
for (; i < friend_id; i ++)
session->calls[i] = NULL;
rc->prev = session->calls[session->calls_tail];
session->calls[session->calls_tail]->next = rc;
session->calls_tail = friend_id;
} else if (session->calls_head > friend_id) { /* Inserting at front */
rc->next = session->calls[session->calls_head];
session->calls[session->calls_head]->prev = rc;
session->calls_head = friend_id;
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}
session->calls[friend_id] = rc;
return rc;
}
void kill_call ( MSICall *call )
{
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/* Assume that session mutex is locked */
if ( call == NULL )
return;
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LOGGER_DEBUG("Killing call: %p", call);
MSISession* session = call->session;
MSICall* prev = call->prev;
MSICall* next = call->next;
if (prev)
prev->next = next;
else if (next)
session->calls_head = next->friend_id;
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else goto CLEAR_CONTAINER;
if (next)
next->prev = prev;
else if (prev)
session->calls_tail = prev->friend_id;
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else goto CLEAR_CONTAINER;
session->calls[call->friend_id] = NULL;
free(call);
return;
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CLEAR_CONTAINER:
session->calls_head = session->calls_tail = 0;
free(session->calls);
free(call);
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session->calls = NULL;
}
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void on_peer_status(Messenger* m, uint32_t friend_id, uint8_t status, void* data)
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{
(void)m;
MSISession *session = data;
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switch ( status ) {
case 0: { /* Friend is now offline */
LOGGER_DEBUG("Friend %d is now offline", friend_id);
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LOGGED_LOCK(session->mutex);
MSICall* call = get_call(session, friend_id);
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if (call == NULL) {
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LOGGED_UNLOCK(session->mutex);
return;
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}
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invoke_callback(call, msi_OnPeerTimeout); /* Failure is ignored */
kill_call(call);
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LOGGED_UNLOCK(session->mutex);
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}
break;
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default:
break;
}
}
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void handle_push ( MSICall *call, const MSIMessage *msg )
{
assert(call);
MSISession* session = call->session;
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LOGGER_DEBUG("Session: %p Handling 'push' friend: %d", call->session, call->friend_id);
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if (!msg->capabilities.exists) {
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LOGGER_WARNING("Session: %p Invalid capabilities on 'push'");
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call->error = msi_EInvalidMessage;
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goto FAILURE;
}
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if (call->state != msi_CallActive) {
if (!msg->vfpsz.exists) {
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LOGGER_WARNING("Session: %p Invalid vfpsz on 'push'");
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call->error = msi_EInvalidMessage;
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goto FAILURE;
}
call->peer_vfpsz = ntohs(msg->vfpsz.value);
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}
switch (call->state) {
case msi_CallInactive: {
LOGGER_INFO("Friend is calling us");
/* Call requested */
call->peer_capabilities = msg->capabilities.value;
call->state = msi_CallRequested;
if ( invoke_callback(call, msi_OnInvite) == -1 )
goto FAILURE;
} break;
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case msi_CallActive: {
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if (msg->vfpsz.exists) {
/* If peer sended video frame piece size
* while the call is already active it's probable
* that he is trying to re-call us while the call
* is not terminated on our side. We can assume that
* in this case we can automatically answer the re-call.
*/
if (call->peer_vfpsz != ntohs(msg->vfpsz.value)) {
LOGGER_WARNING("Friend sent invalid parameters for re-call");
call->error = msi_EInvalidParam;
invoke_callback(call, msi_OnError);
goto FAILURE;
}
LOGGER_INFO("Friend is recalling us");
MSIMessage msg;
msg_init(&msg, requ_push);
msg.capabilities.exists = true;
msg.capabilities.value = call->self_capabilities;
msg.vfpsz.exists = true;
msg.vfpsz.value = htons(VIDEOFRAME_PIECE_SIZE);
send_message ( call->session->messenger, call->friend_id, &msg );
/* If peer changed capabilities during re-call they will
* be handled accordingly during the next step
*/
}
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/* Only act if capabilities changed */
if ( call->peer_capabilities != msg->capabilities.value) {
LOGGER_INFO("Friend is changing capabilities");
call->peer_capabilities = msg->capabilities.value;
if ( invoke_callback(call, msi_OnCapabilities) == -1 )
goto FAILURE;
}
} break;
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case msi_CallRequesting: {
LOGGER_INFO("Friend answered our call");
/* Call started */
call->peer_capabilities = msg->capabilities.value;
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call->state = msi_CallActive;
if ( invoke_callback(call, msi_OnStart) == -1 )
goto FAILURE;
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} break;
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case msi_CallRequested: {
/* Consecutive pushes during initialization state are ignored */
LOGGER_WARNING("Consecutive push");
} break;
}
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return;
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FAILURE:
send_error(call->session->messenger, call->friend_id, call->error);
kill_call(call);
}
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void handle_pop ( MSICall *call, const MSIMessage *msg )
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{
assert(call);
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LOGGER_DEBUG("Session: %p Handling 'pop', friend id: %d", call->session, call->friend_id);
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/* callback errors are ignored */
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if (msg->error.exists) {
LOGGER_WARNING("Friend detected an error: %d", msg->error.value);
call->error = msg->error.value;
invoke_callback(call, msi_OnError);
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} else switch (call->state) {
case msi_CallInactive: {
LOGGER_ERROR("Handling what should be impossible case");
abort();
} break;
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case msi_CallActive: {
/* Hangup */
LOGGER_INFO("Friend hung up on us");
invoke_callback(call, msi_OnEnd);
} break;
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case msi_CallRequesting: {
/* Reject */
LOGGER_INFO("Friend rejected our call");
invoke_callback(call, msi_OnEnd);
} break;
case msi_CallRequested: {
/* Cancel */
LOGGER_INFO("Friend canceled call invite");
invoke_callback(call, msi_OnEnd);
} break;
}
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kill_call ( call );
}
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void handle_msi_packet ( Messenger* m, uint32_t friend_id, const uint8_t* data, uint16_t length, void* object )
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{
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LOGGER_DEBUG("Got msi message");
MSISession *session = object;
MSIMessage msg;
if ( msg_parse_in ( &msg, data, length ) == -1 ) {
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LOGGER_WARNING("Error parsing message");
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send_error(m, friend_id, msi_EInvalidMessage);
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return;
} else {
LOGGER_DEBUG("Successfully parsed message");
}
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LOGGED_LOCK(session->mutex);
MSICall *call = get_call(session, friend_id);
if (call == NULL) {
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if (msg.request.value != requ_push) {
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send_error(m, friend_id, msi_EStrayMessage);
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LOGGED_UNLOCK(session->mutex);
return;
}
call = new_call(session, friend_id);
if (call == NULL) {
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send_error(m, friend_id, msi_ESystem);
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LOGGED_UNLOCK(session->mutex);
return;
}
}
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if (msg.request.value == requ_push)
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handle_push(call, &msg);
else
handle_pop(call, &msg); /* always kills the call */
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LOGGED_UNLOCK(session->mutex);
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}