mirror of
https://github.com/irungentoo/toxcore.git
synced 2024-03-22 13:30:51 +08:00
8a56cb3b58
Change the custom_packet_handler callback function interface to be consistent with other callback interfaces. The new interface takes the Messenger object calling as the first parameter, and moves the user data object to be the last parameter. This makes it comparable to the callbacks for file transfer and the like, and should simplify building interfaces. The new prototype is: int (*)(Messenger *m, int32_t friendnumber, const uint8_t *data, uint32_t len, void *object)
528 lines
14 KiB
C
528 lines
14 KiB
C
/** rtp.c
|
|
*
|
|
* Copyright (C) 2013 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 */
|
|
|
|
#include "../toxcore/logger.h"
|
|
#include "../toxcore/util.h"
|
|
|
|
#include "rtp.h"
|
|
#include <stdlib.h>
|
|
void queue_message(RTPSession *_session, RTPMessage *_msg);
|
|
|
|
#define size_32 4
|
|
|
|
#define ADD_FLAG_VERSION(_h, _v) do { ( _h->flags ) &= 0x3F; ( _h->flags ) |= ( ( ( _v ) << 6 ) & 0xC0 ); } while(0)
|
|
#define ADD_FLAG_PADDING(_h, _v) do { if ( _v > 0 ) _v = 1; ( _h->flags ) &= 0xDF; ( _h->flags ) |= ( ( ( _v ) << 5 ) & 0x20 ); } while(0)
|
|
#define ADD_FLAG_EXTENSION(_h, _v) do { if ( _v > 0 ) _v = 1; ( _h->flags ) &= 0xEF;( _h->flags ) |= ( ( ( _v ) << 4 ) & 0x10 ); } while(0)
|
|
#define ADD_FLAG_CSRCC(_h, _v) do { ( _h->flags ) &= 0xF0; ( _h->flags ) |= ( ( _v ) & 0x0F ); } while(0)
|
|
#define ADD_SETTING_MARKER(_h, _v) do { if ( _v > 1 ) _v = 1; ( _h->marker_payloadt ) &= 0x7F; ( _h->marker_payloadt ) |= ( ( ( _v ) << 7 ) /*& 0x80 */ ); } while(0)
|
|
#define ADD_SETTING_PAYLOAD(_h, _v) do { if ( _v > 127 ) _v = 127; ( _h->marker_payloadt ) &= 0x80; ( _h->marker_payloadt ) |= ( ( _v ) /* & 0x7F */ ); } while(0)
|
|
|
|
#define GET_FLAG_VERSION(_h) (( _h->flags & 0xd0 ) >> 6)
|
|
#define GET_FLAG_PADDING(_h) (( _h->flags & 0x20 ) >> 5)
|
|
#define GET_FLAG_EXTENSION(_h) (( _h->flags & 0x10 ) >> 4)
|
|
#define GET_FLAG_CSRCC(_h) ( _h->flags & 0x0f )
|
|
#define GET_SETTING_MARKER(_h) (( _h->marker_payloadt ) >> 7)
|
|
#define GET_SETTING_PAYLOAD(_h) ((_h->marker_payloadt) & 0x7f)
|
|
|
|
/**
|
|
* Checks if message came in late.
|
|
*/
|
|
static int check_late_message (RTPSession *session, RTPMessage *msg)
|
|
{
|
|
/*
|
|
* Check Sequence number. If this new msg has lesser number then the session->rsequnum
|
|
* it shows that the message came in late. Also check timestamp to be 100% certain.
|
|
*
|
|
*/
|
|
return ( msg->header->sequnum < session->rsequnum && msg->header->timestamp < session->timestamp ) ? 0 : -1;
|
|
}
|
|
|
|
|
|
/**
|
|
* Extracts header from payload.
|
|
*/
|
|
RTPHeader *extract_header ( const uint8_t *payload, int length )
|
|
{
|
|
if ( !payload || !length ) {
|
|
LOGGER_WARNING("No payload to extract!");
|
|
return NULL;
|
|
}
|
|
|
|
RTPHeader *retu = calloc(1, sizeof (RTPHeader));
|
|
|
|
if ( !retu ) {
|
|
LOGGER_WARNING("Alloc failed! Program might misbehave!");
|
|
return NULL;
|
|
}
|
|
|
|
memcpy(&retu->sequnum, payload, sizeof(retu->sequnum));
|
|
retu->sequnum = ntohs(retu->sequnum);
|
|
|
|
const uint8_t *it = payload + 2;
|
|
|
|
retu->flags = *it;
|
|
++it;
|
|
|
|
/* This indicates if the first 2 bits are valid.
|
|
* Now it may happen that this is out of order but
|
|
* it cuts down chances of parsing some invalid value
|
|
*/
|
|
|
|
if ( GET_FLAG_VERSION(retu) != RTP_VERSION ) {
|
|
/* Deallocate */
|
|
LOGGER_WARNING("Invalid version!");
|
|
free(retu);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Added a check for the size of the header little sooner so
|
|
* I don't need to parse the other stuff if it's bad
|
|
*/
|
|
uint8_t cc = GET_FLAG_CSRCC ( retu );
|
|
int total = 12 /* Minimum header len */ + ( cc * 4 );
|
|
|
|
if ( length < total ) {
|
|
/* Deallocate */
|
|
LOGGER_WARNING("Length invalid!");
|
|
free(retu);
|
|
return NULL;
|
|
}
|
|
|
|
memset(retu->csrc, 0, 16 * sizeof (uint32_t));
|
|
|
|
retu->marker_payloadt = *it;
|
|
++it;
|
|
retu->length = total;
|
|
|
|
|
|
memcpy(&retu->timestamp, it, sizeof(retu->timestamp));
|
|
retu->timestamp = ntohl(retu->timestamp);
|
|
it += 4;
|
|
memcpy(&retu->ssrc, it, sizeof(retu->ssrc));
|
|
retu->ssrc = ntohl(retu->ssrc);
|
|
|
|
uint8_t x;
|
|
|
|
for ( x = 0; x < cc; x++ ) {
|
|
it += 4;
|
|
memcpy(&retu->csrc[x], it, sizeof(retu->csrc[x]));
|
|
retu->csrc[x] = ntohl(retu->csrc[x]);
|
|
}
|
|
|
|
return retu;
|
|
}
|
|
|
|
/**
|
|
* Extracts external header from payload. Must be called AFTER extract_header()!
|
|
*/
|
|
RTPExtHeader *extract_ext_header ( const uint8_t *payload, uint16_t length )
|
|
{
|
|
const uint8_t *it = payload;
|
|
|
|
RTPExtHeader *retu = calloc(1, sizeof (RTPExtHeader));
|
|
|
|
if ( !retu ) {
|
|
LOGGER_WARNING("Alloc failed! Program might misbehave!");
|
|
return NULL;
|
|
}
|
|
|
|
uint16_t ext_length;
|
|
memcpy(&ext_length, it, sizeof(ext_length));
|
|
ext_length = ntohs(ext_length);
|
|
it += 2;
|
|
|
|
|
|
if ( length < ( ext_length * sizeof(uint32_t) ) ) {
|
|
LOGGER_WARNING("Length invalid!");
|
|
free(retu);
|
|
return NULL;
|
|
}
|
|
|
|
retu->length = ext_length;
|
|
memcpy(&retu->type, it, sizeof(retu->type));
|
|
retu->type = ntohs(retu->type);
|
|
it += 2;
|
|
|
|
if ( !(retu->table = calloc(ext_length, sizeof (uint32_t))) ) {
|
|
LOGGER_WARNING("Alloc failed! Program might misbehave!");
|
|
free(retu);
|
|
return NULL;
|
|
}
|
|
|
|
uint16_t x;
|
|
|
|
for ( x = 0; x < ext_length; x++ ) {
|
|
it += 4;
|
|
memcpy(&(retu->table[x]), it, sizeof(retu->table[x]));
|
|
retu->table[x] = ntohl(retu->table[x]);
|
|
}
|
|
|
|
return retu;
|
|
}
|
|
|
|
/**
|
|
* Adds header to payload. Make sure _payload_ has enough space.
|
|
*/
|
|
uint8_t *add_header ( RTPHeader *header, uint8_t *payload )
|
|
{
|
|
uint8_t cc = GET_FLAG_CSRCC ( header );
|
|
uint8_t *it = payload;
|
|
uint16_t sequnum;
|
|
uint32_t timestamp;
|
|
uint32_t ssrc;
|
|
uint32_t csrc;
|
|
|
|
|
|
/* Add sequence number first */
|
|
sequnum = htons(header->sequnum);
|
|
memcpy(it, &sequnum, sizeof(sequnum));
|
|
it += 2;
|
|
|
|
*it = header->flags;
|
|
++it;
|
|
*it = header->marker_payloadt;
|
|
++it;
|
|
|
|
|
|
timestamp = htonl(header->timestamp);
|
|
memcpy(it, ×tamp, sizeof(timestamp));
|
|
it += 4;
|
|
ssrc = htonl(header->ssrc);
|
|
memcpy(it, &ssrc, sizeof(ssrc));
|
|
|
|
uint8_t x;
|
|
|
|
for ( x = 0; x < cc; x++ ) {
|
|
it += 4;
|
|
csrc = htonl(header->csrc[x]);
|
|
memcpy(it, &csrc, sizeof(csrc));
|
|
}
|
|
|
|
return it + 4;
|
|
}
|
|
|
|
/**
|
|
* Adds extension header to payload. Make sure _payload_ has enough space.
|
|
*/
|
|
uint8_t *add_ext_header ( RTPExtHeader *header, uint8_t *payload )
|
|
{
|
|
uint8_t *it = payload;
|
|
uint16_t length;
|
|
uint16_t type;
|
|
uint32_t entry;
|
|
|
|
length = htons(header->length);
|
|
memcpy(it, &length, sizeof(length));
|
|
it += 2;
|
|
type = htons(header->type);
|
|
memcpy(it, &type, sizeof(type));
|
|
it -= 2; /* Return to 0 position */
|
|
|
|
if ( header->table ) {
|
|
|
|
uint16_t x;
|
|
|
|
for ( x = 0; x < header->length; x++ ) {
|
|
it += 4;
|
|
entry = htonl(header->table[x]);
|
|
memcpy(it, &entry, sizeof(entry));
|
|
}
|
|
}
|
|
|
|
return it + 4;
|
|
}
|
|
|
|
/**
|
|
* Builds header from control session values.
|
|
*/
|
|
RTPHeader *build_header ( RTPSession *session )
|
|
{
|
|
RTPHeader *retu = calloc ( 1, sizeof (RTPHeader) );
|
|
|
|
if ( !retu ) {
|
|
LOGGER_WARNING("Alloc failed! Program might misbehave!");
|
|
return NULL;
|
|
}
|
|
|
|
ADD_FLAG_VERSION ( retu, session->version );
|
|
ADD_FLAG_PADDING ( retu, session->padding );
|
|
ADD_FLAG_EXTENSION ( retu, session->extension );
|
|
ADD_FLAG_CSRCC ( retu, session->cc );
|
|
ADD_SETTING_MARKER ( retu, session->marker );
|
|
ADD_SETTING_PAYLOAD ( retu, session->payload_type );
|
|
|
|
retu->sequnum = session->sequnum;
|
|
retu->timestamp = current_time_monotonic(); /* milliseconds */
|
|
retu->ssrc = session->ssrc;
|
|
|
|
int i;
|
|
|
|
for ( i = 0; i < session->cc; i++ )
|
|
retu->csrc[i] = session->csrc[i];
|
|
|
|
retu->length = 12 /* Minimum header len */ + ( session->cc * size_32 );
|
|
|
|
return retu;
|
|
}
|
|
|
|
|
|
/**
|
|
* Parses data into RTPMessage struct. Stores headers separately from the payload data
|
|
* and so the length variable is set accordingly.
|
|
*/
|
|
RTPMessage *msg_parse ( const uint8_t *data, int length )
|
|
{
|
|
RTPMessage *retu = calloc(1, sizeof (RTPMessage));
|
|
|
|
retu->header = extract_header ( data, length ); /* It allocates memory and all */
|
|
|
|
if ( !retu->header ) {
|
|
LOGGER_WARNING("Header failed to extract!");
|
|
free(retu);
|
|
return NULL;
|
|
}
|
|
|
|
uint16_t from_pos = retu->header->length;
|
|
retu->length = length - from_pos;
|
|
|
|
|
|
|
|
if ( GET_FLAG_EXTENSION ( retu->header ) ) {
|
|
retu->ext_header = extract_ext_header ( data + from_pos, length );
|
|
|
|
if ( retu->ext_header ) {
|
|
retu->length -= ( 4 /* Minimum ext header len */ + retu->ext_header->length * size_32 );
|
|
from_pos += ( 4 /* Minimum ext header len */ + retu->ext_header->length * size_32 );
|
|
} else { /* Error */
|
|
LOGGER_WARNING("Ext Header failed to extract!");
|
|
rtp_free_msg(NULL, retu);
|
|
return NULL;
|
|
}
|
|
} else {
|
|
retu->ext_header = NULL;
|
|
}
|
|
|
|
if ( length - from_pos <= MAX_RTP_SIZE )
|
|
memcpy ( retu->data, data + from_pos, length - from_pos );
|
|
else {
|
|
LOGGER_WARNING("Invalid length!");
|
|
rtp_free_msg(NULL, retu);
|
|
return NULL;
|
|
}
|
|
|
|
retu->next = NULL;
|
|
|
|
return retu;
|
|
}
|
|
|
|
/**
|
|
* Callback for networking core.
|
|
*/
|
|
int rtp_handle_packet ( Messenger* m, int32_t friendnumber, const uint8_t *data, uint32_t length, void *object )
|
|
{
|
|
RTPSession *session = object;
|
|
RTPMessage *msg;
|
|
|
|
if ( !session || length < 13 ) { /* 12 is the minimum length for rtp + desc. byte */
|
|
LOGGER_WARNING("No session or invalid length of received buffer!");
|
|
return -1;
|
|
}
|
|
|
|
msg = msg_parse ( data + 1, length - 1 );
|
|
|
|
if ( !msg ) {
|
|
LOGGER_WARNING("Could not parse message!");
|
|
return -1;
|
|
}
|
|
|
|
/* Check if message came in late */
|
|
if ( check_late_message(session, msg) < 0 ) { /* Not late */
|
|
session->rsequnum = msg->header->sequnum;
|
|
session->timestamp = msg->header->timestamp;
|
|
}
|
|
|
|
queue_message(session, msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Allocate message and store data there
|
|
*/
|
|
RTPMessage *rtp_new_message ( RTPSession *session, const uint8_t *data, uint32_t length )
|
|
{
|
|
if ( !session ) {
|
|
LOGGER_WARNING("No session!");
|
|
return NULL;
|
|
}
|
|
|
|
uint8_t *from_pos;
|
|
RTPMessage *retu = calloc(1, sizeof (RTPMessage));
|
|
|
|
if ( !retu ) {
|
|
LOGGER_WARNING("Alloc failed! Program might misbehave!");
|
|
return NULL;
|
|
}
|
|
|
|
/* Sets header values and copies the extension header in retu */
|
|
retu->header = build_header ( session ); /* It allocates memory and all */
|
|
retu->ext_header = session->ext_header;
|
|
|
|
|
|
uint32_t total_length = length + retu->header->length + 1;
|
|
|
|
retu->data[0] = session->prefix;
|
|
|
|
if ( retu->ext_header ) {
|
|
total_length += ( 4 /* Minimum ext header len */ + retu->ext_header->length * size_32 );
|
|
|
|
from_pos = add_header ( retu->header, retu->data + 1 );
|
|
from_pos = add_ext_header ( retu->ext_header, from_pos + 1 );
|
|
} else {
|
|
from_pos = add_header ( retu->header, retu->data + 1 );
|
|
}
|
|
|
|
/*
|
|
* Parses the extension header into the message
|
|
* Of course if any
|
|
*/
|
|
|
|
/* Appends data on to retu->data */
|
|
memcpy ( from_pos, data, length );
|
|
|
|
retu->length = total_length;
|
|
|
|
retu->next = NULL;
|
|
|
|
return retu;
|
|
}
|
|
|
|
|
|
|
|
int rtp_send_msg ( RTPSession *session, Messenger *messenger, const uint8_t *data, uint16_t length )
|
|
{
|
|
RTPMessage *msg = rtp_new_message (session, data, length);
|
|
|
|
if ( !msg ) return -1;
|
|
|
|
if ( -1 == send_custom_lossy_packet(messenger, session->dest, msg->data, msg->length) ) {
|
|
LOGGER_WARNING("Failed to send full packet (len: %d)! std error: %s", length, strerror(errno));
|
|
rtp_free_msg ( session, msg );
|
|
return rtp_ErrorSending;
|
|
}
|
|
|
|
|
|
/* Set sequ number */
|
|
session->sequnum = session->sequnum >= MAX_SEQU_NUM ? 0 : session->sequnum + 1;
|
|
rtp_free_msg ( session, msg );
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rtp_free_msg ( RTPSession *session, RTPMessage *msg )
|
|
{
|
|
if ( !session ) {
|
|
if ( msg->ext_header ) {
|
|
free ( msg->ext_header->table );
|
|
free ( msg->ext_header );
|
|
}
|
|
} else {
|
|
if ( msg->ext_header && session->ext_header != msg->ext_header ) {
|
|
free ( msg->ext_header->table );
|
|
free ( msg->ext_header );
|
|
}
|
|
}
|
|
|
|
free ( msg->header );
|
|
free ( msg );
|
|
}
|
|
|
|
RTPSession *rtp_new ( int payload_type, Messenger *messenger, int friend_num )
|
|
{
|
|
RTPSession *retu = calloc(1, sizeof(RTPSession));
|
|
|
|
if ( !retu ) {
|
|
LOGGER_WARNING("Alloc failed! Program might misbehave!");
|
|
return NULL;
|
|
}
|
|
|
|
if ( -1 == custom_lossy_packet_registerhandler(messenger, friend_num, payload_type, rtp_handle_packet, retu)) {
|
|
LOGGER_ERROR("Error setting custom register handler for rtp session");
|
|
free(retu);
|
|
return NULL;
|
|
}
|
|
|
|
LOGGER_DEBUG("Registered packet handler: pt: %d; fid: %d", payload_type, friend_num);
|
|
|
|
retu->version = RTP_VERSION; /* It's always 2 */
|
|
retu->padding = 0; /* If some additional data is needed about the packet */
|
|
retu->extension = 0; /* If extension to header is needed */
|
|
retu->cc = 1; /* Amount of contributors */
|
|
retu->csrc = NULL; /* Container */
|
|
retu->ssrc = random_int();
|
|
retu->marker = 0;
|
|
retu->payload_type = payload_type % 128;
|
|
|
|
retu->dest = friend_num;
|
|
|
|
retu->rsequnum = retu->sequnum = 0;
|
|
|
|
retu->ext_header = NULL; /* When needed allocate */
|
|
|
|
|
|
if ( !(retu->csrc = calloc(1, sizeof (uint32_t))) ) {
|
|
LOGGER_WARNING("Alloc failed! Program might misbehave!");
|
|
free(retu);
|
|
return NULL;
|
|
}
|
|
|
|
retu->csrc[0] = retu->ssrc; /* Set my ssrc to the list receive */
|
|
|
|
/* Also set payload type as prefix */
|
|
retu->prefix = payload_type;
|
|
|
|
/*
|
|
*
|
|
*/
|
|
return retu;
|
|
}
|
|
|
|
void rtp_kill ( RTPSession *session, Messenger *messenger )
|
|
{
|
|
if ( !session ) return;
|
|
|
|
custom_lossy_packet_registerhandler(messenger, session->dest, session->prefix, NULL, NULL);
|
|
|
|
free ( session->ext_header );
|
|
free ( session->csrc );
|
|
|
|
LOGGER_DEBUG("Terminated RTP session: %p", session);
|
|
|
|
/* And finally free session */
|
|
free ( session );
|
|
|
|
}
|