/** toxmsi.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 . * * * Report bugs/suggestions at #tox-dev @ freenode.net:6667 */ #ifdef HAVE_CONFIG_H #include "config.h" #endif /* HAVE_CONFIG_H */ #include "../toxcore/logger.h" /*#define _BSD_SOURCE*/ #include "msi.h" #include "event.h" #include #include #include #include #define inline__ inline __attribute__((always_inline)) #define same(x, y) strcmp((const char*) x, (const char*) y) == 0 #define MSI_MAXMSG_SIZE 1024 #define TYPE_REQUEST 1 #define TYPE_RESPONSE 2 unsigned char *VERSION_STRING = (unsigned char *)"0.3.1"; #define VERSION_STRLEN 5 #define CT_AUDIO_HEADER_VALUE "AUDIO" #define CT_VIDEO_HEADER_VALUE "VIDEO" /* Define default timeout for a request. * There is no behavior specified by the msi on what will * client do on timeout, but to call timeout callback. */ #define m_deftout 10000 /* in milliseconds */ /** * Protocol: * * | desc. ( 1 byte ) | length ( 2 bytes ) | value ( length bytes ) | * * ie. * * | 0x1 | 0x0 0x7 | "version" * * Means: it's field value with length of 7 bytes and value of "version" * It's similar to amp protocol */ #define GENERIC_HEADER(header) \ typedef struct _MSIHeader##header { \ uint8_t* header_value; \ uint16_t size; \ } MSIHeader##header; GENERIC_HEADER ( Version ) GENERIC_HEADER ( Request ) GENERIC_HEADER ( Response ) GENERIC_HEADER ( CallType ) GENERIC_HEADER ( CallId ) GENERIC_HEADER ( Info ) GENERIC_HEADER ( Reason ) GENERIC_HEADER ( CryptoKey ) GENERIC_HEADER ( Nonce ) /** * @brief This is the message structure. It contains all of the headers and * destination/source of the message stored in friend_id. * */ typedef struct _MSIMessage { MSIHeaderVersion version; MSIHeaderRequest request; MSIHeaderResponse response; MSIHeaderCallType calltype; MSIHeaderInfo info; MSIHeaderReason reason; MSIHeaderCallId callid; MSIHeaderCryptoKey cryptokey; MSIHeaderNonce nonce; struct _MSIMessage *next; int friend_id; } MSIMessage; static struct _Callbacks { MSICallback function; void* data; } callbacks[11] = {0}; inline__ void invoke_callback(uint32_t call_index, MSICallbackID id) { /*if ( callbacks[id].function ) event.rise ( callbacks[id].function, callbacks[id].data );*/ if ( callbacks[id].function ) { LOGGER_DEBUG("Invoking callback function: %d", id); callbacks[id].function ( call_index, callbacks[id].data ); } } /*static MSICallback callbacks[10] = {0};*/ /* define strings for the identifiers */ #define VERSION_FIELD "Version" #define REQUEST_FIELD "Request" #define RESPONSE_FIELD "Response" #define INFO_FIELD "INFO" #define REASON_FIELD "Reason" #define CALLTYPE_FIELD "Call-type" #define CALLID_FIELD "Call-id" #define CRYPTOKEY_FIELD "Crypto-key" #define NONCE_FIELD "Nonce" /* protocol descriptors */ #define end_byte 0x0 #define field_byte 0x1 #define value_byte 0x2 typedef enum { invite, start, cancel, reject, end, } MSIRequest; /** * @brief Get string value for request. * * @param request The request. * @return const uint8_t* The string */ static inline__ const uint8_t *stringify_request ( MSIRequest request ) { static const uint8_t *strings[] = { ( uint8_t * ) "INVITE", ( uint8_t * ) "START", ( uint8_t * ) "CANCEL", ( uint8_t * ) "REJECT", ( uint8_t * ) "END" }; return strings[request]; } typedef enum { ringing, starting, ending, error } MSIResponse; /** * @brief Get string value for response. * * @param response The response. * @return const uint8_t* The string */ static inline__ const uint8_t *stringify_response ( MSIResponse response ) { static const uint8_t *strings[] = { ( uint8_t * ) "ringing", ( uint8_t * ) "starting", ( uint8_t * ) "ending", ( uint8_t * ) "error" }; return strings[response]; } #define ON_HEADER(iterator, header, descriptor, size_const) \ ( memcmp(iterator, descriptor, size_const) == 0){ /* Okay */ \ iterator += size_const; /* Set iterator at begining of value part */ \ if ( *iterator != value_byte ) { assert(0); return -1; }\ iterator ++;\ uint16_t _value_size = (uint16_t) *(iterator ) << 8 | \ (uint16_t) *(iterator + 1); \ header.header_value = calloc(sizeof(uint8_t), _value_size); \ header.size = _value_size; \ memcpy(header.header_value, iterator + 2, _value_size);\ iterator = iterator + 2 + _value_size; /* set iterator at new header or end_byte */ \ } /** * @brief Parse raw 'data' received from socket into MSIMessage struct. * Every message has to have end value of 'end_byte' or _undefined_ behavior * occures. The best practice is to check the end of the message at the handle_packet. * * @param msg Container. * @param data The data. * @return int * @retval -1 Error occured. * @retval 0 Success. */ int parse_raw_data ( MSIMessage *msg, const uint8_t *data, uint16_t length ) { if ( msg == NULL ) { LOGGER_ERROR("Could not parse message: no storage!"); } if ( data[length - 1] ) /* End byte must have value 0 */ return -1; const uint8_t *_it = data; while ( *_it ) {/* until end_byte is hit */ uint16_t itedlen = (_it - data) + 2; if ( *_it == field_byte && itedlen < length ) { uint16_t _size = ( uint16_t ) * ( _it + 1 ) << 8 | ( uint16_t ) * ( _it + 2 ); if ( itedlen + _size > length ) return -1; _it += 3; /* place it at the field value beginning */ switch ( _size ) { /* Compare the size of the hardcoded values ( vary fast and convenient ) */ case 4: { /* INFO header */ if ON_HEADER ( _it, msg->info, INFO_FIELD, 4 ) } break; case 5: { /* NONCE header */ if ON_HEADER ( _it, msg->nonce, NONCE_FIELD, 5 ) } break; case 6: { /* Reason header */ if ON_HEADER ( _it, msg->reason, REASON_FIELD, 6 ) } break; case 7: { /* Version, Request, Call-id headers */ if ON_HEADER ( _it, msg->version, VERSION_FIELD, 7 ) else if ON_HEADER ( _it, msg->request, REQUEST_FIELD, 7 ) else if ON_HEADER ( _it, msg->callid, CALLID_FIELD, 7 ) } break; case 8: { /* Response header */ if ON_HEADER ( _it, msg->response, RESPONSE_FIELD, 8 ) } break; case 9: { /* Call-type header */ if ON_HEADER ( _it, msg->calltype, CALLTYPE_FIELD, 9 ) } break; case 10: { /* Crypto-key headers */ if ON_HEADER ( _it, msg->cryptokey, CRYPTOKEY_FIELD, 10 ) } break; default: LOGGER_ERROR("Unkown field value"); return -1; } } else { LOGGER_ERROR("Invalid field byte or field size too large"); return -1; } /* If it's anything else return failure as the message is invalid */ } return 0; } #define ALLOCATE_HEADER( var, mheader_value, t_size) \ var.header_value = calloc(sizeof *mheader_value, t_size); \ if (var.header_value == NULL) { LOGGER_WARNING("Header allocation failed!"); } \ else { memcpy(var.header_value, mheader_value, t_size); \ var.size = t_size; } /** * @brief Speaks for it self. * * @param msg The message. * @return void */ void free_message ( MSIMessage *msg ) { if ( msg == NULL ) { LOGGER_ERROR("Tried to free empty message"); } free ( msg->calltype.header_value ); free ( msg->request.header_value ); free ( msg->response.header_value ); free ( msg->version.header_value ); free ( msg->info.header_value ); free ( msg->cryptokey.header_value ); free ( msg->nonce.header_value ); free ( msg->reason.header_value ); free ( msg->callid.header_value ); free ( msg ); } /** * @brief Create the message. * * @param type Request or response. * @param type_id Type of request/response. * @return MSIMessage* Created message. * @retval NULL Error occured. */ MSIMessage *msi_new_message ( uint8_t type, const uint8_t *type_id ) { MSIMessage *_retu = calloc ( sizeof ( MSIMessage ), 1 ); if ( _retu == NULL ) { LOGGER_WARNING("Allocation failed!"); return NULL; } if ( type == TYPE_REQUEST ) { ALLOCATE_HEADER ( _retu->request, type_id, strlen ( (const char *)type_id ) ) } else if ( type == TYPE_RESPONSE ) { ALLOCATE_HEADER ( _retu->response, type_id, strlen ( (const char *)type_id ) ) } else { free_message ( _retu ); return NULL; } ALLOCATE_HEADER ( _retu->version, VERSION_STRING, strlen ( (const char *)VERSION_STRING ) ) return _retu; } /** * @brief Parse data from handle_packet. * * @param data The data. * @return MSIMessage* Parsed message. * @retval NULL Error occured. */ MSIMessage *parse_message ( const uint8_t *data, uint16_t length ) { if ( data == NULL ) { LOGGER_WARNING("Tried to parse empty message!"); return NULL; } MSIMessage *_retu = calloc ( sizeof ( MSIMessage ), 1 ); if ( _retu == NULL ) { LOGGER_WARNING("Allocation failed!"); return NULL; } memset ( _retu, 0, sizeof ( MSIMessage ) ); if ( parse_raw_data ( _retu, data, length ) == -1 ) { free_message ( _retu ); return NULL; } if ( !_retu->version.header_value || VERSION_STRLEN != _retu->version.size || memcmp ( _retu->version.header_value, VERSION_STRING, VERSION_STRLEN ) != 0 ) { free_message ( _retu ); return NULL; } return _retu; } /** * @brief Makes clear message presentation * * @param msg Message * @param dest Dest string * @return int */ int stringify_message(MSIMessage* msg, char* dest) { #define HDR_TO_STR(__dest, __hdr) if (__hdr.header_value) {\ char nltstr[MSI_MAXMSG_SIZE]; memset(nltstr, '\0', MSI_MAXMSG_SIZE); int i = 0; \ for ( ; i < __hdr.size; i ++) nltstr[i] = (char)__hdr.header_value[i]; \ } if ( !msg || !dest ) return -1; HDR_TO_STR(dest, msg->version); HDR_TO_STR(dest, msg->request); HDR_TO_STR(dest, msg->response); HDR_TO_STR(dest, msg->reason); HDR_TO_STR(dest, msg->callid); HDR_TO_STR(dest, msg->calltype); HDR_TO_STR(dest, msg->cryptokey); HDR_TO_STR(dest, msg->nonce); // if (msg->version.header_value) { // U8_TO_NLTCHAR(msg->version.header_value, msg->version.size, nltstr, MSI_MAXMSG_SIZE); // sprintf(dest, "Version: %s\n", nltstr); // } return 0; } /** * @brief Speaks for it self. * * @param dest Container. * @param header_field Field. * @param header_value Field value. * @param value_len Length of field value. * @param length Pointer to container length. * @return uint8_t* Iterated container. */ uint8_t *append_header_to_string ( uint8_t *dest, const uint8_t *header_field, const uint8_t *header_value, uint16_t value_len, uint16_t *length ) { if ( dest == NULL ) { LOGGER_ERROR("No destination space!"); assert(dest); } if (header_value == NULL) { LOGGER_ERROR("Empty header value"); return NULL; } if ( header_field == NULL ) { LOGGER_ERROR("Empty header field"); return NULL; } const uint8_t *_hvit = header_value; uint16_t _total = 6 + value_len; /* 6 is known plus header value len + field len*/ *dest = field_byte; /* Set the first byte */ uint8_t *_getback_byte = dest + 1; /* remeber the byte we were on */ dest += 3; /* swith to 4th byte where field value starts */ /* Now set the field value and calculate it's length */ uint16_t _i = 0; for ( ; header_field[_i]; ++_i ) { *dest = header_field[_i]; ++dest; }; _total += _i; /* Now set the length of the field byte */ *_getback_byte = ( uint8_t ) _i >> 8; _getback_byte++; *_getback_byte = ( uint8_t ) _i; /* for value part do it regulary */ *dest = value_byte; dest++; *dest = ( uint8_t ) value_len >> 8; dest++; *dest = ( uint8_t ) value_len; dest++; for ( _i = value_len; _i; --_i ) { *dest = *_hvit; ++_hvit; ++dest; } *length += _total; return dest; } #define CLEAN_ASSIGN(added, var, field, header)\ if ( header.header_value ) { var = append_header_to_string(var, (const uint8_t*)field, header.header_value, header.size, &added); } /** * @brief Convert MSIMessage struct to _sendable_ string. * * @param msg The message. * @param dest Destination. * @return uint16_t It's final size. */ uint16_t message_to_send ( MSIMessage *msg, uint8_t *dest ) { if (msg == NULL) { LOGGER_ERROR("Empty message!"); return 0; } if (dest == NULL ) { LOGGER_ERROR("Empty destination!"); return 0; } uint8_t *_iterated = dest; uint16_t _size = 0; CLEAN_ASSIGN ( _size, _iterated, VERSION_FIELD, msg->version ); CLEAN_ASSIGN ( _size, _iterated, REQUEST_FIELD, msg->request ); CLEAN_ASSIGN ( _size, _iterated, RESPONSE_FIELD, msg->response ); CLEAN_ASSIGN ( _size, _iterated, CALLTYPE_FIELD, msg->calltype ); CLEAN_ASSIGN ( _size, _iterated, INFO_FIELD, msg->info ); CLEAN_ASSIGN ( _size, _iterated, CALLID_FIELD, msg->callid ); CLEAN_ASSIGN ( _size, _iterated, REASON_FIELD, msg->reason ); CLEAN_ASSIGN ( _size, _iterated, CRYPTOKEY_FIELD, msg->cryptokey ); CLEAN_ASSIGN ( _size, _iterated, NONCE_FIELD, msg->nonce ); *_iterated = end_byte; _size ++; return _size; } #define GENERIC_SETTER_DEFINITION(header) \ void msi_msg_set_##header ( MSIMessage* _msg, const uint8_t* header_value, uint16_t _size ) \ { assert(_msg); assert(header_value); \ free(_msg->header.header_value); \ ALLOCATE_HEADER( _msg->header, header_value, _size )} GENERIC_SETTER_DEFINITION ( calltype ) GENERIC_SETTER_DEFINITION ( reason ) GENERIC_SETTER_DEFINITION ( info ) GENERIC_SETTER_DEFINITION ( callid ) GENERIC_SETTER_DEFINITION ( cryptokey ) GENERIC_SETTER_DEFINITION ( nonce ) /** * @brief Generate _random_ alphanumerical string. * * @param str Destination. * @param size Size of string. * @return void */ void t_randomstr ( uint8_t *str, size_t size ) { if (str == NULL) { LOGGER_DEBUG("Empty destination!"); return; } static const uint8_t _bytes[] = "0123456789" "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz"; size_t _it = 0; for ( ; _it < size; _it++ ) { str[_it] = _bytes[ random_int() % 61 ]; } } typedef enum { error_deadcall = 1, /* has call id but it's from old call */ error_id_mismatch, /* non-existing call */ error_no_callid, /* not having call id */ error_no_call, /* no call in session */ error_no_crypto_key, /* no crypto key */ error_busy } MSICallError; /* Error codes */ /** * @brief Stringify error code. * * @param error_code The code. * @return const uint8_t* The string. */ static inline__ const uint8_t *stringify_error ( MSICallError error_code ) { static const uint8_t *strings[] = { ( uint8_t * ) "", ( uint8_t * ) "Using dead call", ( uint8_t * ) "Call id not set to any call", ( uint8_t * ) "Call id not available", ( uint8_t * ) "No active call in session", ( uint8_t * ) "No Crypto-key set", ( uint8_t * ) "Callee busy" }; return strings[error_code]; } /** * @brief Convert error_code into string. * * @param error_code The code. * @return const uint8_t* The string. */ static inline__ const uint8_t *stringify_error_code ( MSICallError error_code ) { static const uint8_t *strings[] = { ( uint8_t * ) "", ( uint8_t * ) "1", ( uint8_t * ) "2", ( uint8_t * ) "3", ( uint8_t * ) "4", ( uint8_t * ) "5", ( uint8_t * ) "6" }; return strings[error_code]; } /** * @brief Speaks for it self. * * @param session Control session. * @param msg The message. * @param to Where to. * @return int * @retval -1 Error occured. * @retval 0 Success. */ int send_message ( MSISession *session, MSICall* call, MSIMessage *msg, uint32_t to ) { msi_msg_set_callid ( msg, call->id, CALL_ID_LEN ); uint8_t _msg_string_final [MSI_MAXMSG_SIZE]; uint16_t _length = message_to_send ( msg, _msg_string_final ); if (!_length) { LOGGER_WARNING("Parsing message failed; nothing sent!"); return -1; } /* LOGGER_SCOPE( char cast[MSI_MAXMSG_SIZE]; stringify_message(msg, cast); LOGGER_DEBUG("[Call: %s] [to: %u] Sending message: len: %d\n%s", call->id, to, _length, cast); );*/ if ( m_msi_packet(session->messenger_handle, to, _msg_string_final, _length) ) { LOGGER_DEBUG("Sent message"); return 0; } return -1; } /** * @brief Determine 'bigger' call id * * @param first duh * @param second duh * @return int * @retval 0 it's first * @retval 1 it's second */ int call_id_bigger( const uint8_t* first, const uint8_t* second) { int i = 0; for (; i < CALL_ID_LEN; i ++) { if ( first[i] != second[i] ) return first[i] > second [i] ? 0 : 1; } } /** * @brief Speaks for it self. * * @param session Control session. * @param msg The message. * @param peer_id The peer. * @return void */ void flush_peer_type ( MSICall *call, MSIMessage *msg, int peer_id ) { if ( msg->calltype.header_value ) { uint8_t hdrval [MSI_MAXMSG_SIZE]; /* Make sure no overflow */ memcpy(hdrval, msg->calltype.header_value, msg->calltype.size); hdrval[msg->calltype.size] = '\0'; if ( strcmp ( ( const char * ) hdrval, CT_AUDIO_HEADER_VALUE ) == 0 ) { call->type_peer[peer_id] = type_audio; } else if ( strcmp ( ( const char * ) hdrval, CT_VIDEO_HEADER_VALUE ) == 0 ) { call->type_peer[peer_id] = type_video; } else {} /* Error */ } else {} /* Error */ } void handle_remote_connection_change(Messenger *messenger, int friend_num, uint8_t status, void *session_p) { MSISession *session = session_p; switch ( status ) { case 0: { /* Went offline */ uint32_t j =0; for ( ; j < session->max_calls; j ++ ) { if ( !session->calls[j] ) continue; int i = 0; for ( ; i < session->calls[j]->peer_count; i ++ ) if ( session->calls[j]->peers[i] == friend_num ) { invoke_callback(j, MSI_OnPeerTimeout); LOGGER_DEBUG("Remote: %d timed out!", friend_num); return; /* TODO: On group calls change behaviour */ } } } break; default: break; } } MSICall* find_call ( MSISession* session, uint8_t* call_id ) { if ( call_id == NULL ) return NULL; uint32_t i = 0; for (; i < session->max_calls; i ++ ) if ( session->calls[i] && memcmp(session->calls[i]->id, call_id, CALL_ID_LEN) == 0 ) return session->calls[i]; return NULL; } /** * @brief Sends error response to peer. * * @param session The session. * @param errid The id. * @param to Where to? * @return int * @retval 0 It's always success. */ int handle_error ( MSISession *session, MSICall* call, MSICallError errid, uint32_t to ) { LOGGER_DEBUG("Sending error: %d on call: %s", errid, call->id); MSIMessage *_msg_error = msi_new_message ( TYPE_RESPONSE, stringify_response ( error ) ); const uint8_t *_error_code_str = stringify_error_code ( errid ); msi_msg_set_reason ( _msg_error, _error_code_str, strlen ( ( const char * ) _error_code_str ) ); send_message ( session, call, _msg_error, to ); free_message ( _msg_error ); session->last_error_id = errid; session->last_error_str = stringify_error ( errid ); invoke_callback(call->call_idx, MSI_OnError); return 0; } /** * @brief Determine the error if any. * * @param session Control session. * @param msg The message. * @return int * @retval -1 No error. * @retval 0 Error occured and response sent. */ int has_call_error ( MSISession *session, MSICall* call, MSIMessage *msg ) { if ( !msg->callid.header_value ) { return handle_error ( session, call, error_no_callid, msg->friend_id ); } else if ( !call ) { return handle_error ( session, call, error_no_call, msg->friend_id ); } else if ( memcmp ( call->id, msg->callid.header_value, CALL_ID_LEN ) != 0 ) { return handle_error ( session, call, error_id_mismatch, msg->friend_id ); } return -1; } /** * @brief Function called at request timeout. If not called in thread it might cause trouble * * @param arg Control session * @return void* */ void *handle_timeout ( void *arg ) { /* TODO: Cancel might not arrive there; set up * timers on these cancels and terminate call on * their timeout */ MSICall *_call = arg; LOGGER_DEBUG("[Call: %s] Request timed out!", _call->id); invoke_callback(_call->call_idx, MSI_OnRequestTimeout); if ( _call && _call->session ) { /* TODO: Cancel all? */ /* uint16_t _it = 0; for ( ; _it < _session->call->peer_count; _it++ ) */ msi_cancel ( _call->session, _call->call_idx, _call->peers [0], "Request timed out" ); } pthread_exit(NULL); } /** * @brief Add peer to peer list. * * @param call What call. * @param peer_id Its id. * @return void */ void add_peer( MSICall *call, int peer_id ) { if ( !call->peers ) { call->peers = calloc(sizeof(int), 1); call->peer_count = 1; } else { call->peer_count ++; call->peers = realloc( call->peers, sizeof(int) * call->peer_count); } call->peers[call->peer_count - 1] = peer_id; } /** * @brief Speaks for it self. * * @param session Control session. * @param peers Amount of peers. (Currently it only supports 1) * @param ringing_timeout Ringing timeout. * @return MSICall* The created call. */ MSICall *init_call ( MSISession *session, int peers, int ringing_timeout ) { if (peers == 0) { LOGGER_ERROR("No peers!"); return NULL; } uint32_t _call_idx = 0; for (; _call_idx < session->max_calls; _call_idx ++) { if ( !session->calls[_call_idx] ) { session->calls[_call_idx] = calloc ( sizeof ( MSICall ), 1 ); break; } } if ( _call_idx == session->max_calls ) { LOGGER_WARNING("Reached maximum amount of calls!"); } MSICall *_call = session->calls[_call_idx]; _call->call_idx = _call_idx; if ( _call == NULL ) { LOGGER_WARNING("Allocation failed!"); return NULL; } _call->type_peer = calloc ( sizeof ( MSICallType ), peers ); if ( _call->type_peer == NULL ) { LOGGER_WARNING("Allocation failed!"); return NULL; } _call->session = session; /*_call->_participant_count = _peers;*/ _call->request_timer_id = 0; _call->ringing_timer_id = 0; _call->key_local = NULL; _call->key_peer = NULL; _call->nonce_local = NULL; _call->nonce_peer = NULL; _call->ringing_tout_ms = ringing_timeout; pthread_mutex_init ( &_call->mutex, NULL ); LOGGER_DEBUG("Started new call with index: %u", _call_idx); return _call; } /** * @brief Terminate the call. * * @param session Control session. * @return int * @retval -1 Error occured. * @retval 0 Success. */ int terminate_call ( MSISession *session, MSICall *call ) { if ( !call ) { LOGGER_WARNING("Tried to terminate non-existing call!"); return -1; } /* Check event loop and cancel timed events if there are any * NOTE: This has to be done before possibly * locking the mutex the second time */ event.timer_release ( call->request_timer_id ); event.timer_release ( call->ringing_timer_id ); /* Get a handle */ pthread_mutex_lock ( &call->mutex ); session->calls[call->call_idx]= NULL; free ( call->type_peer ); free ( call->key_local ); free ( call->key_peer ); free ( call->peers); /* Release handle */ pthread_mutex_unlock ( &call->mutex ); pthread_mutex_destroy ( &call->mutex ); free ( call ); return 0; } /********** Request handlers **********/ int handle_recv_invite ( MSISession *session, MSICall* call, MSIMessage *msg ) { LOGGER_DEBUG("Handling 'invite' on call: %s", call? (char*)call->id : "making new"); if ( call ) { if ( call->peers[0] == msg->friend_id ) { /* The glare case. A calls B when at the same time * B calls A. Who has advantage is set bey calculating * 'bigger' Call id and then that call id is being used in * future. User with 'bigger' Call id has the advantage * as in he will wait the reponse from the other. */ if ( call_id_bigger (call->id, msg->callid.header_value) == 1 ) { /* Peer has advantage */ terminate_call(session, call); } else { return 0; /* Wait for ringing from peer */ } } else { handle_error ( session, call, error_busy, msg->friend_id ); /* TODO: Ugh*/ return 0; } } if ( !msg->callid.header_value ) { handle_error ( session, call, error_no_callid, msg->friend_id ); return 0; } MSICall* new_call = init_call ( session, 1, 0 ); if ( !new_call ) { handle_error ( session, call, error_busy, msg->friend_id ); return 0; } memcpy ( new_call->id, msg->callid.header_value, CALL_ID_LEN ); new_call->state = call_starting; add_peer( new_call, msg->friend_id); flush_peer_type ( new_call, msg, 0 ); MSIMessage *_msg_ringing = msi_new_message ( TYPE_RESPONSE, stringify_response ( ringing ) ); send_message ( session, new_call, _msg_ringing, msg->friend_id ); free_message ( _msg_ringing ); invoke_callback(new_call->call_idx, MSI_OnInvite); return 1; } int handle_recv_start ( MSISession *session, MSICall* call, MSIMessage *msg ) { LOGGER_DEBUG("Handling 'start' on call: %s", call->id ); if ( has_call_error ( session, call, msg ) == 0 ) return -1; if ( !msg->cryptokey.header_value ) return handle_error ( session, call, error_no_crypto_key, msg->friend_id ); call->state = call_active; call->key_peer = calloc ( sizeof ( uint8_t ), crypto_secretbox_KEYBYTES ); memcpy ( call->key_peer, msg->cryptokey.header_value, crypto_secretbox_KEYBYTES ); call->nonce_peer = calloc ( sizeof ( uint8_t ), crypto_secretbox_NONCEBYTES ); memcpy ( call->nonce_peer, msg->nonce.header_value, crypto_secretbox_NONCEBYTES ); flush_peer_type ( call, msg, 0 ); invoke_callback(call->call_idx, MSI_OnStart); return 1; } int handle_recv_reject ( MSISession *session, MSICall* call, MSIMessage *msg ) { LOGGER_DEBUG("Handling 'reject' on call: %s", call->id ); if ( has_call_error ( session, call, msg ) == 0 ) return 0; MSIMessage *_msg_ending = msi_new_message ( TYPE_RESPONSE, stringify_response ( ending ) ); send_message ( session, call, _msg_ending, msg->friend_id ); free_message ( _msg_ending ); invoke_callback(call->call_idx, MSI_OnReject); /* event.timer_release ( session->call->request_timer_id ); session->call->request_timer_id = event.timer_alloc ( handle_timeout, session, m_deftout ); */ terminate_call(session, call); return 1; } int handle_recv_cancel ( MSISession *session, MSICall* call, MSIMessage *msg ) { LOGGER_DEBUG("Handling 'cancel' on call: %s", call->id ); if ( has_call_error ( session, call, msg ) == 0 ) return 0; /* Act as end message */ MSIMessage *_msg_ending = msi_new_message ( TYPE_RESPONSE, stringify_response ( ending ) ); send_message ( session, call, _msg_ending, msg->friend_id ); free_message ( _msg_ending ); invoke_callback(call->call_idx, MSI_OnCancel); terminate_call ( session, call ); return 1; } int handle_recv_end ( MSISession *session, MSICall* call, MSIMessage *msg ) { LOGGER_DEBUG("Handling 'end' on call: %s", call->id ); if ( has_call_error ( session, call, msg ) == 0 ) return 0; MSIMessage *_msg_ending = msi_new_message ( TYPE_RESPONSE, stringify_response ( ending ) ); send_message ( session, call, _msg_ending, msg->friend_id ); free_message ( _msg_ending ); invoke_callback(call->call_idx, MSI_OnEnd); terminate_call ( session, call ); return 1; } /********** Response handlers **********/ int handle_recv_ringing ( MSISession *session, MSICall* call, MSIMessage *msg ) { LOGGER_DEBUG("Handling 'ringing' on call: %s", call->id ); if ( has_call_error ( session, call, msg ) == 0 ) return 0; call->ringing_timer_id = event.timer_alloc ( handle_timeout, call, call->ringing_tout_ms ); invoke_callback(call->call_idx, MSI_OnRinging); return 1; } int handle_recv_starting ( MSISession *session, MSICall* call, MSIMessage *msg ) { LOGGER_DEBUG("Handling 'starting' on call: %s", call->id ); if ( has_call_error ( session, call, msg ) == 0 ) return 0; if ( !msg->cryptokey.header_value ) { return handle_error ( session, call, error_no_crypto_key, msg->friend_id ); } /* Generate local key/nonce to send */ call->key_local = calloc ( sizeof ( uint8_t ), crypto_secretbox_KEYBYTES ); new_symmetric_key ( call->key_local ); call->nonce_local = calloc ( sizeof ( uint8_t ), crypto_secretbox_NONCEBYTES ); new_nonce ( call->nonce_local ); /* Save peer key/nonce */ call->key_peer = calloc ( sizeof ( uint8_t ), crypto_secretbox_KEYBYTES ); memcpy ( call->key_peer, msg->cryptokey.header_value, crypto_secretbox_KEYBYTES ); call->nonce_peer = calloc ( sizeof ( uint8_t ), crypto_secretbox_NONCEBYTES ); memcpy ( call->nonce_peer, msg->nonce.header_value, crypto_secretbox_NONCEBYTES ); call->state = call_active; MSIMessage *_msg_start = msi_new_message ( TYPE_REQUEST, stringify_request ( start ) ); msi_msg_set_cryptokey ( _msg_start, call->key_local, crypto_secretbox_KEYBYTES ); msi_msg_set_nonce ( _msg_start, call->nonce_local, crypto_secretbox_NONCEBYTES ); send_message ( session, call, _msg_start, msg->friend_id ); free_message ( _msg_start ); flush_peer_type ( call, msg, 0 ); invoke_callback(call->call_idx, MSI_OnStarting); event.timer_release ( call->ringing_timer_id ); return 1; } int handle_recv_ending ( MSISession *session, MSICall* call, MSIMessage *msg ) { LOGGER_DEBUG("Handling 'ending' on call: %s", call->id ); if ( has_call_error ( session, call, msg ) == 0 ) return 0; /* Stop timer */ event.timer_release ( call->request_timer_id ); invoke_callback(call->call_idx, MSI_OnEnding); /* Terminate call */ terminate_call ( session, call ); return 1; } int handle_recv_error ( MSISession *session, MSICall* call, MSIMessage *msg ) { if ( !call ) { LOGGER_WARNING("Handling 'error' on non-existing call!"); return -1; } LOGGER_DEBUG("Handling 'error' on call: %s", call->id ); /* Handle error accordingly */ if ( msg->reason.header_value ) { session->last_error_id = atoi ( ( const char * ) msg->reason.header_value ); session->last_error_str = stringify_error ( session->last_error_id ); LOGGER_DEBUG("Error reason: %s", session->last_error_str); } invoke_callback(call->call_idx, MSI_OnEnding); terminate_call ( session, call ); return 1; } /** * @brief BASIC call flow: * * ALICE BOB * | invite --> | * | | * | <-- ringing | * | | * | <-- starting | * | | * | start --> | * | | * | <-- MEDIA TRANS --> | * | | * | end --> | * | | * | <-- ending | * * Alice calls Bob by sending invite packet. * Bob recvs the packet and sends an ringing packet; * which notifies Alice that her invite is acknowledged. * Ringing screen shown on both sides. * Bob accepts the invite for a call by sending starting packet. * Alice recvs the starting packet and sends the started packet to * inform Bob that she recved the starting packet. * Now the media transmission is established ( i.e. RTP transmission ). * Alice hangs up and sends end packet. * Bob recves the end packet and sends ending packet * as the acknowledgement that the call is ending. * * */ void msi_handle_packet ( Messenger *messenger, int source, uint8_t *data, uint16_t length, void *object ) { LOGGER_DEBUG("Got msi message"); /* Unused */ (void)messenger; MSISession *_session = object; MSIMessage *_msg; if ( !length ) { LOGGER_WARNING("Lenght param negative"); return; } _msg = parse_message ( data, length ); if ( !_msg ) { LOGGER_WARNING("Error parsing message"); return; } else { LOGGER_DEBUG("Successfully parsed message"); } _msg->friend_id = source; /* Find what call */ MSICall* _call = _msg->callid.header_value ? find_call(_session, _msg->callid.header_value ) : NULL; /* Now handle message */ if ( _msg->request.header_value ) { /* Handle request */ if ( _msg->response.size > 32 ) { LOGGER_WARNING("Header size too big"); goto free_end; } uint8_t _request_value[32]; memcpy(_request_value, _msg->request.header_value, _msg->request.size); _request_value[_msg->request.size] = '\0'; if ( same ( _request_value, stringify_request ( invite ) ) ) { handle_recv_invite ( _session, _call, _msg ); } else if ( same ( _request_value, stringify_request ( start ) ) ) { handle_recv_start ( _session, _call, _msg ); } else if ( same ( _request_value, stringify_request ( cancel ) ) ) { handle_recv_cancel ( _session, _call, _msg ); } else if ( same ( _request_value, stringify_request ( reject ) ) ) { handle_recv_reject ( _session, _call, _msg ); } else if ( same ( _request_value, stringify_request ( end ) ) ) { handle_recv_end ( _session, _call, _msg ); } else { LOGGER_WARNING("Uknown request"); goto free_end; } } else if ( _msg->response.header_value ) { /* Handle response */ if ( _msg->response.size > 32 ) { LOGGER_WARNING("Header size too big"); goto free_end; } uint8_t _response_value[32]; memcpy(_response_value, _msg->response.header_value, _msg->response.size); _response_value[_msg->response.size] = '\0'; if ( same ( _response_value, stringify_response ( ringing ) ) ) { handle_recv_ringing ( _session, _call, _msg ); } else if ( same ( _response_value, stringify_response ( starting ) ) ) { handle_recv_starting ( _session, _call, _msg ); } else if ( same ( _response_value, stringify_response ( ending ) ) ) { handle_recv_ending ( _session, _call, _msg ); } else if ( same ( _response_value, stringify_response ( error ) ) ) { handle_recv_error ( _session, _call, _msg ); } else { LOGGER_WARNING("Uknown response"); goto free_end; } /* Got response so cancel timer */ if ( _call ) event.timer_release ( _call->request_timer_id ); } else { LOGGER_WARNING("Invalid message: no resp nor requ headers"); } free_end:free_message ( _msg ); } /******************************************************************************************************************** * ******************************************************************************************************************* ******************************************************************************************************************** ******************************************************************************************************************** ******************************************************************************************************************** * * * * PUBLIC API FUNCTIONS IMPLEMENTATIONS * * * ******************************************************************************************************************** ******************************************************************************************************************** ******************************************************************************************************************** ******************************************************************************************************************** ********************************************************************************************************************/ /** * @brief Callback setter. * * @param callback The callback. * @param id The id. * @return void */ void msi_register_callback ( MSICallback callback, MSICallbackID id, void* userdata ) { callbacks[id].function = callback; callbacks[id].data = userdata; } /** * @brief Start the control session. * * @param messenger Tox* object. * @param max_calls Amount of calls possible * @return MSISession* The created session. * @retval NULL Error occured. */ MSISession *msi_init_session ( Messenger* messenger, uint32_t max_calls ) { if (messenger == NULL) { LOGGER_ERROR("Could not init session on empty messenger!"); return NULL; } if ( !max_calls) return NULL; MSISession *_retu = calloc ( sizeof ( MSISession ), 1 ); if (_retu == NULL) { LOGGER_ERROR("Allocation failed!"); return NULL; } _retu->messenger_handle = messenger; _retu->agent_handler = NULL; _retu->calls = calloc( sizeof (MSICall*), max_calls ); _retu->max_calls = max_calls; _retu->frequ = 10000; /* default value? */ _retu->call_timeout = 30000; /* default value? */ m_callback_msi_packet(messenger, msi_handle_packet, _retu ); /* This is called when remote terminates session */ m_callback_connectionstatus_internal_av(messenger, handle_remote_connection_change, _retu); LOGGER_DEBUG("New msi session: %p max calls: %u", _retu, max_calls); return _retu; } /** * @brief Terminate control session. * * @param session The session * @return int */ int msi_terminate_session ( MSISession *session ) { if (session == NULL) { LOGGER_ERROR("Tried to terminate non-existing session"); return -1; } int _status = 0; /* If have calls, cancel them */ uint32_t idx = 0; for (; idx < session->max_calls; idx ++) if ( session->calls[idx] ) { /* Cancel all? */ uint16_t _it = 0; for ( ; _it < session->calls[idx]->peer_count; _it++ ) msi_cancel ( session, idx, session->calls[idx]->peers [_it], "MSI session terminated!" ); } m_callback_msi_packet((struct Messenger *) session->messenger_handle, NULL, NULL); free ( session ); return _status; } /** * @brief Send invite request to friend_id. * * @param session Control session. * @param call_type Type of the call. Audio or Video(both audio and video) * @param rngsec Ringing timeout. * @param friend_id The friend. * @return int */ int msi_invite ( MSISession* session, uint32_t* call_index, MSICallType call_type, uint32_t rngsec, uint32_t friend_id ) { LOGGER_DEBUG("Inviting friend: %u", friend_id); MSIMessage *_msg_invite = msi_new_message ( TYPE_REQUEST, stringify_request ( invite ) ); MSICall* _call = init_call ( session, 1, rngsec ); /* Just one for now */ if ( !_call ) return -1; /* Cannot handle more calls */ *call_index = _call->call_idx; t_randomstr ( _call->id, CALL_ID_LEN ); add_peer(_call, friend_id ); _call->type_local = call_type; /* Do whatever with message */ if ( call_type == type_audio ) { msi_msg_set_calltype ( _msg_invite, ( const uint8_t * ) CT_AUDIO_HEADER_VALUE, strlen ( CT_AUDIO_HEADER_VALUE ) ); } else { msi_msg_set_calltype ( _msg_invite, ( const uint8_t * ) CT_VIDEO_HEADER_VALUE, strlen ( CT_VIDEO_HEADER_VALUE ) ); } send_message ( session, _call, _msg_invite, friend_id ); free_message ( _msg_invite ); _call->state = call_inviting; _call->request_timer_id = event.timer_alloc ( handle_timeout, _call, m_deftout ); LOGGER_DEBUG("Invite sent"); return 0; } /** * @brief Hangup active call. * * @param session Control session. * @param call_id To which call is this action handled. * @return int * @retval -1 Error occured. * @retval 0 Success. */ int msi_hangup ( MSISession* session, uint32_t call_index ) { LOGGER_DEBUG("Hanging up call: %u", call_index); if ( call_index >= session->max_calls || !session->calls[call_index] ) { LOGGER_ERROR("Invalid call index!"); return -1; } if ( !session->calls[call_index] || session->calls[call_index]->state != call_active ) { LOGGER_ERROR("No call with such index or call is not active!"); return -1; } MSIMessage *_msg_end = msi_new_message ( TYPE_REQUEST, stringify_request ( end ) ); /* hangup for each peer */ int _it = 0; for ( ; _it < session->calls[call_index]->peer_count; _it ++ ) send_message ( session, session->calls[call_index], _msg_end, session->calls[call_index]->peers[_it] ); free_message ( _msg_end ); session->calls[call_index]->request_timer_id = event.timer_alloc ( handle_timeout, session->calls[call_index], m_deftout ); return 0; } /** * @brief Answer active call request. * * @param session Control session. * @param call_id To which call is this action handled. * @param call_type Answer with Audio or Video(both). * @return int */ int msi_answer ( MSISession* session, uint32_t call_index, MSICallType call_type ) { LOGGER_DEBUG("Answering call: %u", call_index); if ( call_index >= session->max_calls || !session->calls[call_index] ){ LOGGER_ERROR("Invalid call index!"); return -1; } MSIMessage *_msg_starting = msi_new_message ( TYPE_RESPONSE, stringify_response ( starting ) ); session->calls[call_index]->type_local = call_type; if ( call_type == type_audio ) { msi_msg_set_calltype ( _msg_starting, ( const uint8_t * ) CT_AUDIO_HEADER_VALUE, strlen ( CT_AUDIO_HEADER_VALUE ) ); } else { msi_msg_set_calltype ( _msg_starting, ( const uint8_t * ) CT_VIDEO_HEADER_VALUE, strlen ( CT_VIDEO_HEADER_VALUE ) ); } /* Now set the local encryption key and pass it with STARTING message */ session->calls[call_index]->key_local = calloc ( sizeof ( uint8_t ), crypto_secretbox_KEYBYTES ); new_symmetric_key ( session->calls[call_index]->key_local ); session->calls[call_index]->nonce_local = calloc ( sizeof ( uint8_t ), crypto_secretbox_NONCEBYTES ); new_nonce ( session->calls[call_index]->nonce_local ); msi_msg_set_cryptokey ( _msg_starting, session->calls[call_index]->key_local, crypto_secretbox_KEYBYTES ); msi_msg_set_nonce ( _msg_starting, session->calls[call_index]->nonce_local, crypto_secretbox_NONCEBYTES ); send_message ( session, session->calls[call_index], _msg_starting, session->calls[call_index]->peers[session->calls[call_index]->peer_count - 1] ); free_message ( _msg_starting ); session->calls[call_index]->state = call_active; return 0; } /** * @brief Cancel request. * * @param session Control session. * @param call_id To which call is this action handled. * @param reason Set optional reason header. Pass NULL if none. * @return int */ int msi_cancel ( MSISession *session, uint32_t call_index, uint32_t peer, const char *reason ) { LOGGER_DEBUG("Canceling call: %u; reason:", call_index, reason? reason : "Unknown"); if ( call_index >= session->max_calls || !session->calls[call_index] ){ LOGGER_ERROR("Invalid call index!"); return -1; } MSIMessage *_msg_cancel = msi_new_message ( TYPE_REQUEST, stringify_request ( cancel ) ); if ( reason ) msi_msg_set_reason(_msg_cancel, (const uint8_t*)reason, strlen(reason)); send_message ( session, session->calls[call_index], _msg_cancel, peer ); free_message ( _msg_cancel ); session->calls[call_index]->request_timer_id = event.timer_alloc ( handle_timeout, session->calls[call_index], m_deftout ); return 0; } /** * @brief Reject request. * * @param session Control session. * @param call_id To which call is this action handled. * @return int */ int msi_reject ( MSISession *session, uint32_t call_index, const uint8_t *reason ) { LOGGER_DEBUG("Rejecting call: %u; reason:", call_index, reason? (char*)reason : "Unknown"); if ( call_index >= session->max_calls || !session->calls[call_index] ){ LOGGER_ERROR("Invalid call index!"); return -1; } MSIMessage *_msg_reject = msi_new_message ( TYPE_REQUEST, stringify_request ( reject ) ); if ( reason ) msi_msg_set_reason(_msg_reject, reason, strlen((const char *)reason) + 1); send_message ( session, session->calls[call_index], _msg_reject, session->calls[call_index]->peers[session->calls[call_index]->peer_count - 1] ); free_message ( _msg_reject ); session->calls[call_index]->request_timer_id = event.timer_alloc ( handle_timeout, session->calls[call_index], m_deftout ); return 0; } /** * @brief Terminate the current call. * * @param session Control session. * @param call_id To which call is this action handled. * @return int */ int msi_stopcall ( MSISession *session, uint32_t call_index ) { LOGGER_DEBUG("Stopping call index: %u", call_index); if ( call_index >= session->max_calls || !session->calls[call_index] ) return -1; /* just terminate it */ terminate_call ( session, session->calls[call_index] ); return 0; }