From: Holger Schemel Date: Tue, 21 Aug 2018 09:32:51 +0000 (+0200) Subject: completely refactored client and server side network protocol code X-Git-Tag: 4.1.1.0~66 X-Git-Url: https://git.artsoft.org/?a=commitdiff_plain;h=45c910a978cabc8e8dd40fac47b17b7d402c91aa;p=rocksndiamonds.git completely refactored client and server side network protocol code --- diff --git a/src/netserv.c b/src/netserv.c index 4b846f9d..551772a0 100644 --- a/src/netserv.c +++ b/src/netserv.c @@ -20,22 +20,20 @@ #include "main.h" -static int clients = 0; -static int onceonly = 0; +static int num_clients = 0; +static boolean run_server_only_once = FALSE; struct NetworkServerPlayerInfo { TCPsocket fd; - char player_name[16]; - unsigned char number; - struct NetworkServerPlayerInfo *next; - char active; - char introduced; - unsigned char readbuffer[MAX_BUFFER_SIZE]; - unsigned char writbuffer[MAX_BUFFER_SIZE]; - int nread, nwrite; + char player_name[MAX_PLAYER_NAME_LEN + 1]; + int number; + boolean active; + boolean introduced; byte action; boolean action_received; + + struct NetworkServerPlayerInfo *next; }; static struct NetworkServerPlayerInfo *first_player = NULL; @@ -47,96 +45,354 @@ static TCPsocket lfd; /* listening TCP socket */ static UDPsocket udp; /* listening UDP socket */ static SDLNet_SocketSet fds; /* socket set */ -static unsigned char realbuffer[512], *buffer = realbuffer + 4; - -static int interrupt; +static struct NetworkBuffer *read_buffer = NULL; +static struct NetworkBuffer *write_buffer = NULL; static unsigned int ServerFrameCounter = 0; -static void addtobuffer(struct NetworkServerPlayerInfo *player, - unsigned char *b, int len) + +int getNetwork8BitInteger(byte *ptr) +{ + return ptr[0]; +} + +int putNetwork8BitInteger(byte *ptr, int value) +{ + ptr[0] = value; + + return 1; +} + +int getNetwork16BitInteger(byte *ptr) +{ + return ((ptr[0] << 8) | + (ptr[1] << 0)); +} + +int putNetwork16BitInteger(byte *ptr, int value) +{ + ptr[0] = (value >> 8) & 0xff; + ptr[1] = (value >> 0) & 0xff; + + return 2; +} + +int getNetwork32BitInteger(byte *ptr) +{ + return ((ptr[0] << 24) | + (ptr[1] << 16) | + (ptr[2] << 8) | + (ptr[3] << 0)); +} + +int putNetwork32BitInteger(byte *ptr, int value) +{ + ptr[0] = (value >> 24) & 0xff; + ptr[1] = (value >> 16) & 0xff; + ptr[2] = (value >> 8) & 0xff; + ptr[3] = (value >> 0) & 0xff; + + return 4; +} + +char *getNetworkString(byte *ptr) +{ + return (char *)ptr; +} + +int putNetworkString(byte *ptr, char *s) { - if (player->nwrite + len >= MAX_BUFFER_SIZE) - Error(ERR_EXIT_NETWORK_SERVER, - "internal error: network send buffer overflow"); + strcpy((char *)ptr, s); - memcpy(player->writbuffer + player->nwrite, b, len); - player->nwrite += len; + return strlen(s) + 1; } -static void flushuser(struct NetworkServerPlayerInfo *player) +struct NetworkBuffer *newNetworkBuffer() { - if (player->nwrite) + struct NetworkBuffer *new = checked_calloc(sizeof(struct NetworkBuffer)); + + new->max_size = MAX_BUFFER_SIZE; + new->size = 0; + new->pos = 0; + + new->buffer = checked_calloc(new->max_size); + + return new; +} + +static void resetNetworkBufferForReading(struct NetworkBuffer *nb) +{ + nb->pos = 0; +} + +static void resetNetworkBufferForWriting(struct NetworkBuffer *nb) +{ + nb->size = 0; + nb->pos = 0; +} + +void initNetworkBufferForReceiving(struct NetworkBuffer *nb) +{ + resetNetworkBufferForWriting(nb); +} + +void initNetworkBufferForReading(struct NetworkBuffer *nb) +{ + resetNetworkBufferForReading(nb); + + /* skip message length header */ + getNetworkBuffer32BitInteger(nb); +} + +void initNetworkBufferForWriting(struct NetworkBuffer *nb, int message_type, + int player_nr) +{ + resetNetworkBufferForWriting(nb); + + /* will be replaced with message length before sending */ + putNetworkBuffer32BitInteger(nb, 0); + + putNetworkBuffer8BitInteger(nb, message_type); + putNetworkBuffer8BitInteger(nb, player_nr); +} + +static void copyNetworkBufferForWriting(struct NetworkBuffer *nb_from, + struct NetworkBuffer *nb_to, + int player_nr) +{ + initNetworkBufferForReading(nb_from); + + int message_type = getNetworkBuffer8BitInteger(nb_from); + + /* skip player number */ + getNetworkBuffer8BitInteger(nb_from); + + initNetworkBufferForWriting(nb_to, message_type, player_nr); + + while (nb_from->pos < nb_from->size) { - SDLNet_TCP_Send(player->fd, player->writbuffer, player->nwrite); + int b = getNetworkBuffer8BitInteger(nb_from); - player->nwrite = 0; + putNetworkBuffer8BitInteger(nb_to, b); } } -static void broadcast(struct NetworkServerPlayerInfo *except, - int len, int activeonly) +static void increaseNetworkBuffer(struct NetworkBuffer *nb, int additional_size) +{ + /* add some more buffer size than is really required this time */ + nb->max_size += additional_size + MAX_BUFFER_SIZE; + nb->buffer = checked_realloc(nb->buffer, nb->max_size); +} + +int receiveNetworkBufferBytes(struct NetworkBuffer *nb, TCPsocket socket, + int num_bytes) +{ + if (nb->pos + num_bytes > nb->max_size) + increaseNetworkBuffer(nb, num_bytes); + + int result = SDLNet_TCP_Recv(socket, &nb->buffer[nb->pos], num_bytes); + + if (result != num_bytes) + return result; + + nb->pos += num_bytes; + nb->size = nb->pos; + + return num_bytes; +} + +int receiveNetworkBufferPacket(struct NetworkBuffer *nb, TCPsocket socket) +{ + int num_bytes, num_bytes_head, num_bytes_body; + + num_bytes_head = 4; + num_bytes = receiveNetworkBufferBytes(nb, socket, num_bytes_head); + + if (num_bytes != num_bytes_head) + return num_bytes; + + num_bytes_body = getNetwork32BitInteger(nb->buffer); + num_bytes = receiveNetworkBufferBytes(nb, socket, num_bytes_body); + + return num_bytes; +} + +int getNetworkBuffer8BitInteger(struct NetworkBuffer *nb) +{ + int num_bytes = 1; + + if (nb->pos + num_bytes > nb->size) + return 0; + + int value = getNetwork8BitInteger(&nb->buffer[nb->pos]); + + nb->pos += num_bytes; + + return value; +} + +void putNetworkBuffer8BitInteger(struct NetworkBuffer *nb, int value) +{ + int num_bytes = 1; + + if (nb->pos + num_bytes > nb->max_size) + increaseNetworkBuffer(nb, num_bytes); + + nb->pos += putNetwork8BitInteger(&nb->buffer[nb->pos], value); + nb->size = nb->pos; +} + +int getNetworkBuffer16BitInteger(struct NetworkBuffer *nb) +{ + int num_bytes = 2; + + if (nb->pos + num_bytes > nb->size) + return 0; + + int value = getNetwork16BitInteger(&nb->buffer[nb->pos]); + + nb->pos += num_bytes; + + return value; +} + +void putNetworkBuffer16BitInteger(struct NetworkBuffer *nb, int value) +{ + int num_bytes = 2; + + if (nb->pos + num_bytes > nb->max_size) + increaseNetworkBuffer(nb, num_bytes); + + nb->pos += putNetwork16BitInteger(&nb->buffer[nb->pos], value); + nb->size = nb->pos; +} + +int getNetworkBuffer32BitInteger(struct NetworkBuffer *nb) +{ + int num_bytes = 4; + + if (nb->pos + num_bytes > nb->size) + return 0; + + int value = getNetwork32BitInteger(&nb->buffer[nb->pos]); + + nb->pos += num_bytes; + + return value; +} + +void putNetworkBuffer32BitInteger(struct NetworkBuffer *nb, int value) +{ + int num_bytes = 4; + + if (nb->pos + num_bytes > nb->max_size) + increaseNetworkBuffer(nb, num_bytes); + + nb->pos += putNetwork32BitInteger(&nb->buffer[nb->pos], value); + nb->size = nb->pos; +} + +char *getNetworkBufferString(struct NetworkBuffer *nb) +{ + char *s = getNetworkString(&nb->buffer[nb->pos]); + + nb->pos += strlen(s) + 1; + + return s; +} + +void putNetworkBufferString(struct NetworkBuffer *nb, char *s) +{ + int num_bytes = strlen(s) + 1; + + if (nb->pos + num_bytes > nb->max_size) + increaseNetworkBuffer(nb, num_bytes); + + nb->pos += putNetworkString(&nb->buffer[nb->pos], s); + nb->size = nb->pos; +} + +static void SendNetworkBufferToAllButOne(struct NetworkBuffer *nb, + struct NetworkServerPlayerInfo *except) { struct NetworkServerPlayerInfo *player; - realbuffer[0] = realbuffer[1] = realbuffer[2] = 0; - realbuffer[3] = (unsigned char)len; - for (player = first_player; player; player = player->next) - if (player != except && player->introduced && - (player->active || !activeonly)) - addtobuffer(player, realbuffer, 4 + len); + /* set message length header */ + putNetwork32BitInteger(nb->buffer, nb->size - 4); + + for (player = first_player; player != NULL; player = player->next) + { + if (player != except && player->introduced) + { + /* directly send the buffer to the network client */ + SDLNet_TCP_Send(player->fd, nb->buffer, nb->size); + } + } } -static void sendtoone(struct NetworkServerPlayerInfo *to, int len) +static void SendNetworkBufferToAll(struct NetworkBuffer *nb) { - realbuffer[0] = realbuffer[1] = realbuffer[2] = 0; - realbuffer[3] = (unsigned char)len; - addtobuffer(to, realbuffer, 4 + len); + SendNetworkBufferToAllButOne(nb, NULL); +} + +static void SendNetworkBufferToClient(struct NetworkBuffer *nb, + struct NetworkServerPlayerInfo *player) +{ + /* set message length header */ + putNetwork32BitInteger(nb->buffer, nb->size - 4); + + /* directly send the buffer to the network client */ + SDLNet_TCP_Send(player->fd, nb->buffer, nb->size); } static void RemovePlayer(struct NetworkServerPlayerInfo *player) { - struct NetworkServerPlayerInfo *v; - if (options.verbose) Error(ERR_NETWORK_SERVER, "dropping client %d (%s)", player->number, player->player_name); + SDLNet_TCP_DelSocket(fds, player->fd); + SDLNet_TCP_Close(player->fd); + if (player == first_player) + { first_player = player->next; + } else { - for (v = first_player; v; v = v->next) + struct NetworkServerPlayerInfo *p; + + for (p = first_player; p != NULL; p = p->next) { - if (v->next && v->next == player) + if (p->next && p->next == player) { - v->next = player->next; + p->next = player->next; + break; } } } - SDLNet_TCP_DelSocket(fds, player->fd); - SDLNet_TCP_Close(player->fd); - if (player->introduced) { - buffer[0] = player->number; - buffer[1] = OP_PLAYER_DISCONNECTED; - broadcast(player, 2, 0); + initNetworkBufferForWriting(write_buffer, OP_PLAYER_DISCONNECTED, + player->number); + + SendNetworkBufferToAllButOne(write_buffer, player); } free(player); - clients--; + num_clients--; #if 0 /* do not terminate network server if last player disconnected */ - if (onceonly && clients == 0) + if (run_server_only_once && num_clients == 0) { if (options.verbose) { Error(ERR_NETWORK_SERVER, "no clients left"); Error(ERR_NETWORK_SERVER, "aborting"); } + exit(0); } #endif @@ -144,103 +400,110 @@ static void RemovePlayer(struct NetworkServerPlayerInfo *player) static void AddPlayer(TCPsocket fd) { - struct NetworkServerPlayerInfo *player, *v; - unsigned char nxn; + struct NetworkServerPlayerInfo *player, *p; + int number = 1; boolean again = TRUE; - player = checked_malloc(sizeof (struct NetworkServerPlayerInfo)); + SDLNet_TCP_AddSocket(fds, fd); + + player = checked_calloc(sizeof(struct NetworkServerPlayerInfo)); player->fd = fd; player->player_name[0] = 0; - player->next = first_player; - player->active = 0; - player->nread = 0; - player->nwrite = 0; - player->introduced = 0; + player->active = FALSE; + player->introduced = FALSE; player->action = 0; player->action_received = FALSE; - - SDLNet_TCP_AddSocket(fds, fd); + player->next = first_player; first_player = player; - nxn = 1; - while (again) { again = FALSE; - v = player->next; + p = player->next; - while (v) + while (p) { - if (v->number == nxn) + if (p->number == number) { - nxn++; + number++; again = TRUE; + break; } - v = v->next; + + p = p->next; } } - player->number = nxn; - clients++; + player->number = number; + num_clients++; - buffer[0] = 0; - buffer[1] = OP_YOUR_NUMBER; - buffer[2] = player->number; - sendtoone(player, 3); + initNetworkBufferForWriting(write_buffer, OP_YOUR_NUMBER, 0); + + putNetworkBuffer8BitInteger(write_buffer, player->number); + + SendNetworkBufferToClient(write_buffer, player); } -static void Handle_OP_PROTOCOL_VERSION(struct NetworkServerPlayerInfo *player, - unsigned int len) +static void Handle_OP_PROTOCOL_VERSION(struct NetworkServerPlayerInfo *player) { - if (len != 5 || - buffer[2] != PROTOCOL_VERSION_1 || - buffer[3] != PROTOCOL_VERSION_2) + int protocol_version_major = getNetworkBuffer8BitInteger(read_buffer); + int protocol_version_minor = getNetworkBuffer8BitInteger(read_buffer); + int protocol_version_patch = getNetworkBuffer8BitInteger(read_buffer); + + if (protocol_version_major != PROTOCOL_VERSION_MAJOR || + protocol_version_minor != PROTOCOL_VERSION_MINOR) { if (options.verbose) Error(ERR_NETWORK_SERVER, "client %d (%s) has wrong protocol version %d.%d.%d", - player->number, player->player_name, buffer[2], buffer[3], buffer[4]); + player->number, player->player_name, + protocol_version_major, + protocol_version_minor, + protocol_version_patch); + + initNetworkBufferForWriting(write_buffer, OP_BAD_PROTOCOL_VERSION, 0); - buffer[0] = 0; - buffer[1] = OP_BAD_PROTOCOL_VERSION; - buffer[2] = PROTOCOL_VERSION_1; - buffer[3] = PROTOCOL_VERSION_2; - buffer[4] = PROTOCOL_VERSION_3; - sendtoone(player, 5); - flushuser(player); + putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MAJOR); + putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MINOR); + putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_PATCH); + + SendNetworkBufferToClient(write_buffer, player); RemovePlayer(player); - interrupt = 1; } else { if (options.verbose) Error(ERR_NETWORK_SERVER, "client %d (%s) uses protocol version %d.%d.%d", - player->number, player->player_name, buffer[2], buffer[3], buffer[4]); + player->number, player->player_name, + protocol_version_major, + protocol_version_minor, + protocol_version_patch); } } static void Handle_OP_NUMBER_WANTED(struct NetworkServerPlayerInfo *player) { - struct NetworkServerPlayerInfo *v; + int nr_wanted = getNetworkBuffer8BitInteger(read_buffer); int client_nr = player->number; - int nr_wanted = buffer[2]; - int nr_is_free = 1; + boolean nr_is_free = TRUE; + struct NetworkServerPlayerInfo *p; if (options.verbose) Error(ERR_NETWORK_SERVER, "client %d (%s) wants to switch to # %d", player->number, player->player_name, nr_wanted); - for (v = first_player; v; v = v->next) + for (p = first_player; p != NULL; p = p->next) { - if (v->number == nr_wanted) + if (p->number == nr_wanted) { - nr_is_free = 0; + nr_is_free = FALSE; + break; } } @@ -262,86 +525,87 @@ static void Handle_OP_NUMBER_WANTED(struct NetworkServerPlayerInfo *player) if (nr_is_free) player->number = nr_wanted; - buffer[0] = client_nr; - buffer[1] = OP_NUMBER_WANTED; - buffer[2] = nr_wanted; - buffer[3] = player->number; + initNetworkBufferForWriting(write_buffer, OP_NUMBER_WANTED, client_nr); - /* - sendtoone(player, 4); - */ + putNetworkBuffer8BitInteger(write_buffer, nr_wanted); + putNetworkBuffer8BitInteger(write_buffer, player->number); - broadcast(NULL, 4, 0); + SendNetworkBufferToAll(write_buffer); } -static void Handle_OP_PLAYER_NAME(struct NetworkServerPlayerInfo *player, - unsigned int len) +static void Handle_OP_PLAYER_NAME(struct NetworkServerPlayerInfo *player) { - struct NetworkServerPlayerInfo *v; + char *player_name = getNetworkBufferString(read_buffer); int i; - if (len>16) - len=16; - memcpy(player->player_name, &buffer[2], len-2); - player->player_name[len-2] = 0; - for (i = 0; i < len - 2; i++) + strncpy(player->player_name, player_name, MAX_PLAYER_NAME_LEN); + player->player_name[MAX_PLAYER_NAME_LEN] = '\0'; + + for (i = 0; i < MAX_PLAYER_NAME_LEN; i++) { - if (player->player_name[i] < ' ' || + if (player->player_name[i] < ' ' || ((unsigned char)(player->player_name[i]) > 0x7e && (unsigned char)(player->player_name[i]) <= 0xa0)) { player->player_name[i] = 0; + break; } } if (!player->introduced) { - buffer[0] = player->number; - buffer[1] = OP_PLAYER_CONNECTED; - broadcast(player, 2, 0); + initNetworkBufferForWriting(write_buffer, OP_PLAYER_CONNECTED, + player->number); + + SendNetworkBufferToAllButOne(write_buffer, player); } if (options.verbose) Error(ERR_NETWORK_SERVER, "client %d calls itself \"%s\"", player->number, player->player_name); - buffer[1] = OP_PLAYER_NAME; - broadcast(player, len, 0); + + copyNetworkBufferForWriting(read_buffer, write_buffer, player->number); + + SendNetworkBufferToAllButOne(write_buffer, player); if (!player->introduced) { - for (v = first_player; v; v = v->next) + struct NetworkServerPlayerInfo *p; + + for (p = first_player; p != NULL; p = p->next) { - if (v != player && v->introduced) + if (p != player && p->introduced) { - buffer[0] = v->number; - buffer[1] = OP_PLAYER_CONNECTED; - sendtoone(player, 2); - buffer[1] = OP_PLAYER_NAME; - memcpy(&buffer[2], v->player_name, 14); - sendtoone(player, 2+strlen(v->player_name)); + initNetworkBufferForWriting(write_buffer, OP_PLAYER_CONNECTED, + p->number); + + SendNetworkBufferToClient(write_buffer, player); + + initNetworkBufferForWriting(write_buffer, OP_PLAYER_NAME, p->number); + + putNetworkBufferString(write_buffer, p->player_name); + + SendNetworkBufferToClient(write_buffer, player); } } } - player->introduced = 1; + player->introduced = TRUE; } static void Handle_OP_START_PLAYING(struct NetworkServerPlayerInfo *player) { - struct NetworkServerPlayerInfo *v, *w; + char *new_leveldir_identifier = getNetworkBufferString(read_buffer); + int level_nr = getNetworkBuffer16BitInteger(read_buffer); if (options.verbose) Error(ERR_NETWORK_SERVER, - "client %d (%s) starts game [level %d from leveldir %d (%s)]", - player->number, player->player_name, - (buffer[2] << 8) + buffer[3], - (buffer[4] << 8) + buffer[5], - &buffer[10]); + "client %d (%s) starts game [level %d from level set '%s']", + player->number, player->player_name, level_nr, + new_leveldir_identifier); - for (w = first_player; w; w = w->next) - if (w->introduced) - w->active = 1; + struct NetworkServerPlayerInfo *p; /* reset frame counter */ ServerFrameCounter = 0; @@ -349,13 +613,18 @@ static void Handle_OP_START_PLAYING(struct NetworkServerPlayerInfo *player) Error(ERR_NETWORK_SERVER, "resetting ServerFrameCounter to 0"); /* reset player actions */ - for (v = first_player; v; v = v->next) + for (p = first_player; p != NULL; p = p->next) { - v->action = 0; - v->action_received = FALSE; + p->action = 0; + p->action_received = FALSE; + + if (p->introduced) + p->active = TRUE; } - broadcast(NULL, 10 + strlen((char *)&buffer[10])+1, 0); + copyNetworkBufferForWriting(read_buffer, write_buffer, player->number); + + SendNetworkBufferToAll(write_buffer); } static void Handle_OP_PAUSE_PLAYING(struct NetworkServerPlayerInfo *player) @@ -363,7 +632,10 @@ static void Handle_OP_PAUSE_PLAYING(struct NetworkServerPlayerInfo *player) if (options.verbose) Error(ERR_NETWORK_SERVER, "client %d (%s) pauses game", player->number, player->player_name); - broadcast(NULL, 2, 0); + + copyNetworkBufferForWriting(read_buffer, write_buffer, player->number); + + SendNetworkBufferToAll(write_buffer); } static void Handle_OP_CONTINUE_PLAYING(struct NetworkServerPlayerInfo *player) @@ -371,67 +643,92 @@ static void Handle_OP_CONTINUE_PLAYING(struct NetworkServerPlayerInfo *player) if (options.verbose) Error(ERR_NETWORK_SERVER, "client %d (%s) continues game", player->number, player->player_name); - broadcast(NULL, 2, 0); + + copyNetworkBufferForWriting(read_buffer, write_buffer, player->number); + + SendNetworkBufferToAll(write_buffer); } static void Handle_OP_STOP_PLAYING(struct NetworkServerPlayerInfo *player) { - int cause_for_stopping = buffer[2]; + int cause_for_stopping = getNetworkBuffer8BitInteger(read_buffer); if (options.verbose) Error(ERR_NETWORK_SERVER, "client %d (%s) stops game [%d]", player->number, player->player_name, cause_for_stopping); - broadcast(NULL, 3, 0); + + copyNetworkBufferForWriting(read_buffer, write_buffer, player->number); + + SendNetworkBufferToAll(write_buffer); } static void Handle_OP_MOVE_PLAYER(struct NetworkServerPlayerInfo *player) { - struct NetworkServerPlayerInfo *v; + int player_action = getNetworkBuffer8BitInteger(read_buffer); int last_client_nr = 0; + struct NetworkServerPlayerInfo *p; int i; /* store player action */ - for (v = first_player; v; v = v->next) + for (p = first_player; p != NULL; p = p->next) { - if (v->number == player->number) + if (p->number == player->number) { - v->action = buffer[2]; - v->action_received = TRUE; + p->action = player_action; + p->action_received = TRUE; } } /* check if server received action from each player */ - for (v = first_player; v; v = v->next) + for (p = first_player; p != NULL; p = p->next) { - if (!v->action_received) + if (!p->action_received) return; - if (v->number > last_client_nr) - last_client_nr = v->number; + if (p->number > last_client_nr) + last_client_nr = p->number; } + int player_action_all[last_client_nr]; + /* initialize all player actions to zero */ for (i = 0; i < last_client_nr; i++) - buffer[6 + i] = 0; + player_action_all[i] = 0; /* broadcast actions of all players to all players */ - for (v = first_player; v; v = v->next) + for (p = first_player; p != NULL; p = p->next) { - buffer[6 + v->number-1] = v->action; - v->action = 0; - v->action_received = FALSE; + player_action_all[p->number - 1] = p->action; + + p->action = 0; + p->action_received = FALSE; } - buffer[2] = (unsigned char)((ServerFrameCounter >> 24) & 0xff); - buffer[3] = (unsigned char)((ServerFrameCounter >> 16) & 0xff); - buffer[4] = (unsigned char)((ServerFrameCounter >> 8) & 0xff); - buffer[5] = (unsigned char)((ServerFrameCounter >> 0) & 0xff); + initNetworkBufferForWriting(write_buffer, OP_MOVE_PLAYER, player->number); + + putNetworkBuffer32BitInteger(write_buffer, ServerFrameCounter); + + for (i = 0; i < last_client_nr; i++) + putNetworkBuffer8BitInteger(write_buffer, player_action_all[i]); - broadcast(NULL, 6 + last_client_nr, 0); + SendNetworkBufferToAll(write_buffer); ServerFrameCounter++; } +static void Handle_OP_BROADCAST_MESSAGE(struct NetworkServerPlayerInfo *player) +{ + char *message = getNetworkBufferString(read_buffer); + + if (options.verbose) + Error(ERR_NETWORK_SERVER, "client %d (%s) sends message: %s", + player->number, player->player_name, message); + + copyNetworkBufferForWriting(read_buffer, write_buffer, player->number); + + SendNetworkBufferToAllButOne(write_buffer, player); +} + void ExitNetworkServer(int exit_value) { Error(ERR_NETWORK_SERVER, "exiting network server"); @@ -452,14 +749,18 @@ int NetworkServerThread(void *ptr) void NetworkServer(int port, int serveronly) { struct NetworkServerPlayerInfo *player; - int r; - unsigned int len; IPaddress ip; #if defined(PLATFORM_UNIX) && !defined(PLATFORM_NEXT) struct sigaction sact; #endif + if (read_buffer == NULL) + read_buffer = newNetworkBuffer(); + + if (write_buffer == NULL) + write_buffer = newNetworkBuffer(); + if (port == 0) port = DEFAULT_SERVER_PORT; @@ -468,7 +769,7 @@ void NetworkServer(int port, int serveronly) signal(SIGINT, ExitNetworkServer); if (!serveronly) - onceonly = 1; + run_server_only_once = TRUE; #if defined(PLATFORM_UNIX) #if defined(PLATFORM_NEXT) @@ -509,16 +810,13 @@ void NetworkServer(int port, int serveronly) { Error(ERR_NETWORK_SERVER, "started up, listening on port %d", port); Error(ERR_NETWORK_SERVER, "using protocol version %d.%d.%d", - PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3); + PROTOCOL_VERSION_MAJOR, + PROTOCOL_VERSION_MINOR, + PROTOCOL_VERSION_PATCH); } while (1) { - interrupt = 0; - - for (player = first_player; player; player = player->next) - flushuser(player); - // wait for 100 ms for activity on open network sockets if (SDLNet_CheckSockets(fds, 100) < 1) continue; @@ -552,108 +850,89 @@ void NetworkServer(int port, int serveronly) } } - player = first_player; - - while (player && !interrupt) + for (player = first_player; player != NULL; player = player->next) { - if (SDLNet_SocketReady(player->fd)) + if (!SDLNet_SocketReady(player->fd)) + continue; + + initNetworkBufferForReceiving(read_buffer); + + int num_bytes = receiveNetworkBufferPacket(read_buffer, player->fd); + + if (num_bytes <= 0) { - /* read only 1 byte, because SDLNet blocks when we want more than is - in the buffer */ - r = SDLNet_TCP_Recv(player->fd, player->readbuffer + player->nread, 1); + if (options.verbose) + Error(ERR_NETWORK_SERVER, "EOF from client %d (%s)", + player->number, player->player_name); - if (r <= 0) - { - if (options.verbose) - Error(ERR_NETWORK_SERVER, "EOF from client %d (%s)", - player->number, player->player_name); - RemovePlayer(player); - interrupt = 1; - break; - } - player->nread += r; - while (player->nread >= 4 && player->nread >= 4 + player->readbuffer[3]) - { - len = player->readbuffer[3]; - if (player->readbuffer[0] || player->readbuffer[1] || player->readbuffer[2]) - { - if (options.verbose) - Error(ERR_NETWORK_SERVER, "crap from client %d (%s)", - player->number, player->player_name); - RemovePlayer(player); - interrupt = 1; - break; - } - memcpy(buffer, &player->readbuffer[4], len); - player->nread -= 4 + len; - memmove(player->readbuffer, player->readbuffer + 4 + len, player->nread); - - buffer[0] = player->number; - if (!player->introduced && - buffer[1] != OP_PLAYER_NAME && - buffer[1] != OP_PROTOCOL_VERSION) - { - if (options.verbose) - Error(ERR_NETWORK_SERVER, "!(client %d)->introduced && buffer[1]==%d (expected OP_PLAYER_NAME or OP_PROTOCOL_VERSION)", buffer[0], buffer[1]); - - RemovePlayer(player); - interrupt = 1; - break; - } - - switch (buffer[1]) - { - case OP_PLAYER_NAME: - Handle_OP_PLAYER_NAME(player, len); - break; - - case OP_PROTOCOL_VERSION: - Handle_OP_PROTOCOL_VERSION(player, len); - break; - - case OP_NUMBER_WANTED: - Handle_OP_NUMBER_WANTED(player); - break; - - case OP_START_PLAYING: - Handle_OP_START_PLAYING(player); - break; - - case OP_PAUSE_PLAYING: - Handle_OP_PAUSE_PLAYING(player); - break; - - case OP_CONTINUE_PLAYING: - Handle_OP_CONTINUE_PLAYING(player); - break; - - case OP_STOP_PLAYING: - Handle_OP_STOP_PLAYING(player); - break; - - case OP_MOVE_PLAYER: - Handle_OP_MOVE_PLAYER(player); - break; - - case OP_BROADCAST_MESSAGE: - buffer[len] = '\0'; - if (options.verbose) - Error(ERR_NETWORK_SERVER, "client %d (%s) sends message: %s", - player->number, player->player_name, &buffer[2]); - broadcast(player, len, 0); - break; - - default: - if (options.verbose) - Error(ERR_NETWORK_SERVER, - "unknown opcode %d from client %d (%s)", - buffer[0], player->number, player->player_name); - } - } + RemovePlayer(player); + + break; } - if (player && !interrupt) - player = player->next; + initNetworkBufferForReading(read_buffer); + + int message_type = getNetworkBuffer8BitInteger(read_buffer); + + /* skip player number */ + getNetworkBuffer8BitInteger(read_buffer); + + if (!player->introduced && + message_type != OP_PLAYER_NAME && + message_type != OP_PROTOCOL_VERSION) + { + if (options.verbose) + Error(ERR_NETWORK_SERVER, "got opcode %d for client %d which is not introduced yet (expected OP_PLAYER_NAME or OP_PROTOCOL_VERSION)", message_type, player->number); + + RemovePlayer(player); + + break; + } + + switch (message_type) + { + case OP_PROTOCOL_VERSION: + Handle_OP_PROTOCOL_VERSION(player); + break; + + case OP_NUMBER_WANTED: + Handle_OP_NUMBER_WANTED(player); + break; + + case OP_PLAYER_NAME: + Handle_OP_PLAYER_NAME(player); + break; + + case OP_START_PLAYING: + Handle_OP_START_PLAYING(player); + break; + + case OP_PAUSE_PLAYING: + Handle_OP_PAUSE_PLAYING(player); + break; + + case OP_CONTINUE_PLAYING: + Handle_OP_CONTINUE_PLAYING(player); + break; + + case OP_STOP_PLAYING: + Handle_OP_STOP_PLAYING(player); + break; + + case OP_MOVE_PLAYER: + Handle_OP_MOVE_PLAYER(player); + break; + + case OP_BROADCAST_MESSAGE: + Handle_OP_BROADCAST_MESSAGE(player); + break; + + default: + if (options.verbose) + Error(ERR_NETWORK_SERVER, + "unknown opcode %d from client %d (%s)", + message_type, player->number, player->player_name); + } } } } diff --git a/src/netserv.h b/src/netserv.h index 463b202f..6017557a 100644 --- a/src/netserv.h +++ b/src/netserv.h @@ -16,9 +16,9 @@ #define DEFAULT_SERVER_PORT 19504 -#define PROTOCOL_VERSION_1 2 -#define PROTOCOL_VERSION_2 0 -#define PROTOCOL_VERSION_3 0 +#define PROTOCOL_VERSION_MAJOR 2 +#define PROTOCOL_VERSION_MINOR 0 +#define PROTOCOL_VERSION_PATCH 0 #define OP_PROTOCOL_VERSION 1 #define OP_BAD_PROTOCOL_VERSION 2 @@ -36,6 +36,43 @@ #define MAX_BUFFER_SIZE 4096 + +struct NetworkBuffer +{ + unsigned int max_size; + unsigned int size; + unsigned int pos; + + byte *buffer; +}; + + +int getNetwork8BitInteger(byte *); +int putNetwork8BitInteger(byte *, int); +int getNetwork16BitInteger(byte *); +int putNetwork16BitInteger(byte *, int); +int getNetwork32BitInteger(byte *); +int putNetwork32BitInteger(byte *, int); +char *getNetworkString(byte *); +int putNetworkString(byte *, char *); + +struct NetworkBuffer *newNetworkBuffer(); +void initNetworkBufferForReceiving(struct NetworkBuffer *); +void initNetworkBufferForReading(struct NetworkBuffer *); +void initNetworkBufferForWriting(struct NetworkBuffer *, int, int); + +int receiveNetworkBufferBytes(struct NetworkBuffer *, TCPsocket, int); +int receiveNetworkBufferPacket(struct NetworkBuffer *, TCPsocket); + +int getNetworkBuffer8BitInteger(struct NetworkBuffer *); +void putNetworkBuffer8BitInteger(struct NetworkBuffer *, int); +int getNetworkBuffer16BitInteger(struct NetworkBuffer *); +void putNetworkBuffer16BitInteger(struct NetworkBuffer *, int); +int getNetworkBuffer32BitInteger(struct NetworkBuffer *); +void putNetworkBuffer32BitInteger(struct NetworkBuffer *, int); +char *getNetworkBufferString(struct NetworkBuffer *); +void putNetworkBufferString(struct NetworkBuffer *, char *); + int NetworkServerThread(void *); void NetworkServer(int, int); diff --git a/src/network.c b/src/network.c index b0a6a0ee..72851746 100644 --- a/src/network.c +++ b/src/network.c @@ -43,10 +43,9 @@ static TCPsocket sfd; /* TCP server socket */ static UDPsocket udp; /* UDP server socket */ static SDLNet_SocketSet rfds; /* socket set */ -static byte realbuffer[512]; -static byte readbuffer[MAX_BUFFER_SIZE], writbuffer[MAX_BUFFER_SIZE]; -static byte *buffer = realbuffer + 4; -static int nread = 0, nwrite = 0; +static struct NetworkBuffer *read_buffer = NULL; +static struct NetworkBuffer *write_buffer = NULL; + static boolean stop_network_game = FALSE; static boolean stop_network_client = FALSE; static char stop_network_client_message[MAX_OUTPUT_LINESIZE + 1]; @@ -128,24 +127,16 @@ static void DrawNetworkText_Title(char *message) DrawNetworkTextExt(message, FC_GREEN, TRUE); } -static void SendBufferToServer(int size) +static void SendNetworkBufferToServer(struct NetworkBuffer *nb) { if (!network.enabled) return; - realbuffer[0] = realbuffer[1] = realbuffer[2] = 0; - realbuffer[3] = (byte)size; - buffer[0] = 0; - - if (nwrite + 4 + size >= MAX_BUFFER_SIZE) - Error(ERR_EXIT, "internal error: network send buffer overflow"); - - memcpy(writbuffer + nwrite, realbuffer, 4 + size); - nwrite += 4 + size; + /* set message length header */ + putNetwork32BitInteger(nb->buffer, nb->size - 4); /* directly send the buffer to the network server */ - SDLNet_TCP_Send(sfd, writbuffer, nwrite); - nwrite = 0; + SDLNet_TCP_Send(sfd, nb->buffer, nb->size); } struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr) @@ -199,6 +190,12 @@ boolean ConnectToServer(char *hostname, int port) int server_host = 0; int i; + if (read_buffer == NULL) + read_buffer = newNetworkBuffer(); + + if (write_buffer == NULL) + write_buffer = newNetworkBuffer(); + DrawNetworkText_Title("Initializing Network"); if (port == 0) @@ -350,107 +347,112 @@ boolean ConnectToServer(char *hostname, int port) void SendToServer_PlayerName(char *player_name) { - int len_player_name = strlen(player_name); + initNetworkBufferForWriting(write_buffer, OP_PLAYER_NAME, 0); + + putNetworkBufferString(write_buffer, player_name); + + SendNetworkBufferToServer(write_buffer); - buffer[1] = OP_PLAYER_NAME; - memcpy(&buffer[2], player_name, len_player_name); - SendBufferToServer(2 + len_player_name); Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name); } void SendToServer_ProtocolVersion() { - buffer[1] = OP_PROTOCOL_VERSION; - buffer[2] = PROTOCOL_VERSION_1; - buffer[3] = PROTOCOL_VERSION_2; - buffer[4] = PROTOCOL_VERSION_3; + initNetworkBufferForWriting(write_buffer, OP_PROTOCOL_VERSION, 0); - SendBufferToServer(5); + putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MAJOR); + putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_MINOR); + putNetworkBuffer8BitInteger(write_buffer, PROTOCOL_VERSION_PATCH); + + SendNetworkBufferToServer(write_buffer); } void SendToServer_NrWanted(int nr_wanted) { - buffer[1] = OP_NUMBER_WANTED; - buffer[2] = nr_wanted; + initNetworkBufferForWriting(write_buffer, OP_NUMBER_WANTED, 0); + + putNetworkBuffer8BitInteger(write_buffer, nr_wanted); - SendBufferToServer(3); + SendNetworkBufferToServer(write_buffer); } void SendToServer_StartPlaying() { unsigned int new_random_seed = InitRND(level.random_seed); - int dummy = 0; /* !!! HAS NO MEANING ANYMORE !!! */ - /* the name of the level must be enough */ - - buffer[1] = OP_START_PLAYING; - buffer[2] = (byte)(level_nr >> 8); - buffer[3] = (byte)(level_nr & 0xff); - buffer[4] = (byte)(dummy >> 8); - buffer[5] = (byte)(dummy & 0xff); - - buffer[6] = (unsigned char)((new_random_seed >> 24) & 0xff); - buffer[7] = (unsigned char)((new_random_seed >> 16) & 0xff); - buffer[8] = (unsigned char)((new_random_seed >> 8) & 0xff); - buffer[9] = (unsigned char)((new_random_seed >> 0) & 0xff); + initNetworkBufferForWriting(write_buffer, OP_START_PLAYING, 0); - strcpy((char *)&buffer[10], leveldir_current->identifier); + putNetworkBufferString( write_buffer, leveldir_current->identifier); + putNetworkBuffer16BitInteger(write_buffer, level_nr); + putNetworkBuffer32BitInteger(write_buffer, new_random_seed); - SendBufferToServer(10 + strlen(leveldir_current->identifier) + 1); + SendNetworkBufferToServer(write_buffer); } void SendToServer_PausePlaying() { - buffer[1] = OP_PAUSE_PLAYING; + initNetworkBufferForWriting(write_buffer, OP_PAUSE_PLAYING, 0); - SendBufferToServer(2); + SendNetworkBufferToServer(write_buffer); } void SendToServer_ContinuePlaying() { - buffer[1] = OP_CONTINUE_PLAYING; + initNetworkBufferForWriting(write_buffer, OP_CONTINUE_PLAYING, 0); - SendBufferToServer(2); + SendNetworkBufferToServer(write_buffer); } void SendToServer_StopPlaying(int cause_for_stopping) { - buffer[1] = OP_STOP_PLAYING; - buffer[2] = cause_for_stopping; + initNetworkBufferForWriting(write_buffer, OP_STOP_PLAYING, 0); - SendBufferToServer(3); + putNetworkBuffer8BitInteger(write_buffer, cause_for_stopping); + + SendNetworkBufferToServer(write_buffer); } void SendToServer_MovePlayer(byte player_action) { - buffer[1] = OP_MOVE_PLAYER; - buffer[2] = player_action; + initNetworkBufferForWriting(write_buffer, OP_MOVE_PLAYER, 0); + + putNetworkBuffer8BitInteger(write_buffer, player_action); - SendBufferToServer(3); + SendNetworkBufferToServer(write_buffer); } static void Handle_OP_BAD_PROTOCOL_VERSION() { + int protocol_version_major = getNetworkBuffer8BitInteger(read_buffer); + int protocol_version_minor = getNetworkBuffer8BitInteger(read_buffer); + Error(ERR_WARN, "protocol version mismatch"); Error(ERR_WARN, "server expects %d.%d.x instead of %d.%d.%d", - buffer[2], buffer[3], - PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3); + protocol_version_major, + protocol_version_minor, + PROTOCOL_VERSION_MAJOR, + PROTOCOL_VERSION_MINOR, + PROTOCOL_VERSION_PATCH); sprintf(stop_network_client_message, "Network protocol version mismatch! Server expects version %d.%d.x instead of %d.%d.%d!", - buffer[2], buffer[3], - PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3); + protocol_version_major, + protocol_version_minor, + PROTOCOL_VERSION_MAJOR, + PROTOCOL_VERSION_MINOR, + PROTOCOL_VERSION_PATCH); stop_network_client = TRUE; } static void Handle_OP_YOUR_NUMBER() { - int new_client_nr = buffer[2]; + int old_client_nr = getNetworkBuffer8BitInteger(read_buffer); + int new_client_nr = getNetworkBuffer8BitInteger(read_buffer); int new_index_nr = new_client_nr - 1; struct PlayerInfo *old_local_player = local_player; struct PlayerInfo *new_local_player = &stored_player[new_index_nr]; - printf("OP_YOUR_NUMBER: %d\n", buffer[0]); + printf("OP_YOUR_NUMBER: %d\n", old_client_nr); first_player.nr = new_client_nr; if (old_local_player != new_local_player) @@ -476,16 +478,16 @@ static void Handle_OP_YOUR_NUMBER() static void Handle_OP_NUMBER_WANTED() { - int client_nr_wanted = buffer[2]; - int old_client_nr = buffer[0]; - int new_client_nr = buffer[3]; + int old_client_nr = getNetworkBuffer8BitInteger(read_buffer); + int client_nr_wanted = getNetworkBuffer8BitInteger(read_buffer); + int new_client_nr = getNetworkBuffer8BitInteger(read_buffer); int old_index_nr = old_client_nr - 1; int new_index_nr = new_client_nr - 1; int index_nr_wanted = client_nr_wanted - 1; struct PlayerInfo *old_player = &stored_player[old_index_nr]; struct PlayerInfo *new_player = &stored_player[new_index_nr]; - printf("OP_NUMBER_WANTED: %d\n", buffer[0]); + printf("OP_NUMBER_WANTED: %d\n", old_client_nr); if (new_client_nr == client_nr_wanted) /* switching succeeded */ { @@ -533,23 +535,25 @@ static void Handle_OP_NUMBER_WANTED() DrawNetworkPlayers(); } -static void Handle_OP_PLAYER_NAME(unsigned int len) +static void Handle_OP_PLAYER_NAME() { - struct NetworkClientPlayerInfo *player; - int player_nr = (int)buffer[0]; + int player_nr = getNetworkBuffer8BitInteger(read_buffer); + char *player_name = getNetworkBufferString(read_buffer); + struct NetworkClientPlayerInfo *player = getNetworkPlayer(player_nr); printf("OP_PLAYER_NAME: %d\n", player_nr); - player = getNetworkPlayer(player_nr); - buffer[len] = 0; + + strncpy(player->name, player_name, MAX_PLAYER_NAME_LEN); + player->name[MAX_PLAYER_NAME_LEN] = '\0'; + Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"", - buffer[0], &buffer[2]); - strncpy(player->name, (char *)&buffer[2], MAX_PLAYER_NAME_LEN); + player_nr, player->name); } static void Handle_OP_PLAYER_CONNECTED() { struct NetworkClientPlayerInfo *player, *last_player = NULL; - int new_client_nr = (int)buffer[0]; + int new_client_nr = getNetworkBuffer8BitInteger(read_buffer); int new_index_nr = new_client_nr - 1; printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr); @@ -575,13 +579,13 @@ static void Handle_OP_PLAYER_CONNECTED() static void Handle_OP_PLAYER_DISCONNECTED() { struct NetworkClientPlayerInfo *player, *player_disconnected; - int player_nr = (int)buffer[0]; + int player_nr = getNetworkBuffer8BitInteger(read_buffer); int index_nr = player_nr - 1; printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr); player_disconnected = getNetworkPlayer(player_nr); Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected", - player_nr, getNetworkPlayerName(buffer[0])); + player_nr, getNetworkPlayerName(player_nr)); for (player = &first_player; player; player = player->next) if (player->next == player_disconnected) @@ -612,18 +616,14 @@ static void Handle_OP_PLAYER_DISCONNECTED() static void Handle_OP_START_PLAYING() { - LevelDirTree *new_leveldir; - int new_level_nr; - unsigned int new_random_seed; - char *new_leveldir_identifier; + int player_nr = getNetworkBuffer8BitInteger(read_buffer); + char *new_leveldir_identifier = getNetworkBufferString(read_buffer); + int new_level_nr = getNetworkBuffer16BitInteger(read_buffer); + unsigned int new_random_seed = getNetworkBuffer32BitInteger(read_buffer); - new_level_nr = (buffer[2] << 8) + buffer[3]; - new_random_seed = - (buffer[6] << 24) | (buffer[7] << 16) | (buffer[8] << 8) | (buffer[9]); - new_leveldir_identifier = (char *)&buffer[10]; + LevelDirTree *new_leveldir = + getTreeInfoFromIdentifier(leveldir_first, new_leveldir_identifier); - new_leveldir = getTreeInfoFromIdentifier(leveldir_first, - new_leveldir_identifier); if (new_leveldir == NULL) { Error(ERR_WARN, "no such level identifier: '%s'", new_leveldir_identifier); @@ -633,10 +633,10 @@ static void Handle_OP_START_PLAYING() return; } - printf("OP_START_PLAYING: %d\n", buffer[0]); + printf("OP_START_PLAYING: %d\n", player_nr); Error(ERR_NETWORK_CLIENT, "client %d starts game [level %d from level identifier '%s']\n", - buffer[0], new_level_nr, new_leveldir->identifier); + player_nr, new_level_nr, new_leveldir->identifier); leveldir_current = new_leveldir; level_nr = new_level_nr; @@ -650,48 +650,56 @@ static void Handle_OP_START_PLAYING() static void Handle_OP_PAUSE_PLAYING() { - printf("OP_PAUSE_PLAYING: %d\n", buffer[0]); - Error(ERR_NETWORK_CLIENT, "client %d pauses game", buffer[0]); + int player_nr = getNetworkBuffer8BitInteger(read_buffer); + + printf("OP_PAUSE_PLAYING: %d\n", player_nr); + Error(ERR_NETWORK_CLIENT, "client %d pauses game", player_nr); if (game_status == GAME_MODE_PLAYING) { tape.pausing = TRUE; - DrawVideoDisplay(VIDEO_STATE_PAUSE_ON,0); + DrawVideoDisplay(VIDEO_STATE_PAUSE_ON, 0); } } static void Handle_OP_CONTINUE_PLAYING() { - printf("OP_CONTINUE_PLAYING: %d\n", buffer[0]); - Error(ERR_NETWORK_CLIENT, "client %d continues game", buffer[0]); + int player_nr = getNetworkBuffer8BitInteger(read_buffer); + + printf("OP_CONTINUE_PLAYING: %d\n", player_nr); + Error(ERR_NETWORK_CLIENT, "client %d continues game", player_nr); if (game_status == GAME_MODE_PLAYING) { tape.pausing = FALSE; - DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0); + DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF, 0); } } static void Handle_OP_STOP_PLAYING() { - printf("OP_STOP_PLAYING: %d [%d]\n", buffer[0], buffer[2]); - Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]", buffer[0], buffer[2]); + int client_nr = getNetworkBuffer8BitInteger(read_buffer); + int cause_for_stopping = getNetworkBuffer8BitInteger(read_buffer); + + printf("OP_STOP_PLAYING: %d [%d]\n", client_nr, cause_for_stopping); + Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]", + client_nr, cause_for_stopping); if (game_status == GAME_MODE_PLAYING) { - int client_nr = buffer[0]; int index_nr = client_nr - 1; struct PlayerInfo *client_player = &stored_player[index_nr]; boolean stopped_by_remote_player = (!client_player->connected_locally); char message[100]; - sprintf(message, (buffer[2] == NETWORK_STOP_BY_PLAYER ? + sprintf(message, (cause_for_stopping == NETWORK_STOP_BY_PLAYER ? "Network game stopped by player %d!" : - buffer[2] == NETWORK_STOP_BY_ERROR ? + cause_for_stopping == NETWORK_STOP_BY_ERROR ? "Network game stopped due to internal error!" : "Network game stopped!"), client_nr); - if (buffer[2] != NETWORK_STOP_BY_PLAYER || stopped_by_remote_player) + if (cause_for_stopping != NETWORK_STOP_BY_PLAYER || + stopped_by_remote_player) Request(message, REQ_CONFIRM | REQ_STAY_CLOSED); SetGameStatus(GAME_MODE_MAIN); @@ -700,20 +708,19 @@ static void Handle_OP_STOP_PLAYING() } } -static void Handle_OP_MOVE_PLAYER(unsigned int len) +static void Handle_OP_MOVE_PLAYER() { - int server_frame_counter; + int player_nr = getNetworkBuffer8BitInteger(read_buffer); + int server_frame_counter = getNetworkBuffer32BitInteger(read_buffer); int i; if (!network_playing) return; - server_frame_counter = - (buffer[2] << 24) | (buffer[3] << 16) | (buffer[4] << 8) | (buffer[5]); - if (server_frame_counter != FrameCounter) { - Error(ERR_INFO, "client and servers frame counters out of sync"); + Error(ERR_INFO, "frame counters of client %d and server out of sync", + player_nr); Error(ERR_INFO, "frame counter of client is %d", FrameCounter); Error(ERR_INFO, "frame counter of server is %d", server_frame_counter); Error(ERR_INFO, "this should not happen -- please debug"); @@ -723,81 +730,84 @@ static void Handle_OP_MOVE_PLAYER(unsigned int len) return; } - /* copy valid player actions */ + /* copy valid player actions (will be set to 0 for not connected players) */ for (i = 0; i < MAX_PLAYERS; i++) stored_player[i].effective_action = - (i < len - 6 ? buffer[6 + i] : 0); + getNetworkBuffer8BitInteger(read_buffer); network_player_action_received = TRUE; } -static void HandleNetworkingMessages() +static void Handle_OP_BROADCAST_MESSAGE() { - unsigned int message_length; + int player_nr = getNetworkBuffer8BitInteger(read_buffer); + + printf("OP_BROADCAST_MESSAGE: %d\n", player_nr); + Error(ERR_NETWORK_CLIENT, "client %d sends message", player_nr); +} +static void HandleNetworkingMessage() +{ stop_network_game = FALSE; - while (nread >= 4 && nread >= 4 + readbuffer[3]) + initNetworkBufferForReading(read_buffer); + + int message_type = getNetworkBuffer8BitInteger(read_buffer); + + switch (message_type) { - message_length = readbuffer[3]; - if (readbuffer[0] || readbuffer[1] || readbuffer[2]) - Error(ERR_EXIT, "wrong network server line length"); + case OP_BAD_PROTOCOL_VERSION: + Handle_OP_BAD_PROTOCOL_VERSION(); + break; - memcpy(buffer, &readbuffer[4], message_length); - nread -= 4 + message_length; - memmove(readbuffer, readbuffer + 4 + message_length, nread); + case OP_YOUR_NUMBER: + Handle_OP_YOUR_NUMBER(); + break; - switch (buffer[1]) - { - case OP_BAD_PROTOCOL_VERSION: - Handle_OP_BAD_PROTOCOL_VERSION(); - break; + case OP_NUMBER_WANTED: + Handle_OP_NUMBER_WANTED(); + break; - case OP_YOUR_NUMBER: - Handle_OP_YOUR_NUMBER(); - break; + case OP_PLAYER_NAME: + Handle_OP_PLAYER_NAME(); + break; - case OP_NUMBER_WANTED: - Handle_OP_NUMBER_WANTED(); - break; + case OP_PLAYER_CONNECTED: + Handle_OP_PLAYER_CONNECTED(); + break; - case OP_PLAYER_NAME: - Handle_OP_PLAYER_NAME(message_length); - break; + case OP_PLAYER_DISCONNECTED: + Handle_OP_PLAYER_DISCONNECTED(); + break; - case OP_PLAYER_CONNECTED: - Handle_OP_PLAYER_CONNECTED(); - break; - - case OP_PLAYER_DISCONNECTED: - Handle_OP_PLAYER_DISCONNECTED(); - break; + case OP_START_PLAYING: + Handle_OP_START_PLAYING(); + break; - case OP_START_PLAYING: - Handle_OP_START_PLAYING(); - break; + case OP_PAUSE_PLAYING: + Handle_OP_PAUSE_PLAYING(); + break; - case OP_PAUSE_PLAYING: - Handle_OP_PAUSE_PLAYING(); - break; + case OP_CONTINUE_PLAYING: + Handle_OP_CONTINUE_PLAYING(); + break; - case OP_CONTINUE_PLAYING: - Handle_OP_CONTINUE_PLAYING(); - break; + case OP_STOP_PLAYING: + Handle_OP_STOP_PLAYING(); + break; - case OP_STOP_PLAYING: - Handle_OP_STOP_PLAYING(); - break; + case OP_MOVE_PLAYER: + Handle_OP_MOVE_PLAYER(); + break; - case OP_MOVE_PLAYER: - Handle_OP_MOVE_PLAYER(message_length); - break; + case OP_BROADCAST_MESSAGE: + Handle_OP_BROADCAST_MESSAGE(); + break; - case OP_BROADCAST_MESSAGE: - printf("OP_BROADCAST_MESSAGE: %d\n", buffer[0]); - Error(ERR_NETWORK_CLIENT, "client %d sends message", buffer[0]); - break; - } + default: + if (options.verbose) + Error(ERR_NETWORK_CLIENT, + "unknown opcode %d from server", message_type); } fflush(stdout); @@ -813,7 +823,7 @@ static char *HandleNetworkingPackets() { /* ---------- check network server for activity ---------- */ - int num_active_sockets = SDLNet_CheckSockets(rfds, 1); + int num_active_sockets = SDLNet_CheckSockets(rfds, 0); if (num_active_sockets < 0) return "Error checking network sockets!"; @@ -823,7 +833,9 @@ static char *HandleNetworkingPackets() /* ---------- read packets from network server ---------- */ - int num_bytes = SDLNet_TCP_Recv(sfd, readbuffer + nread, 1); + initNetworkBufferForReceiving(read_buffer); + + int num_bytes = receiveNetworkBufferPacket(read_buffer, sfd); if (num_bytes < 0) return "Error reading from network server!"; @@ -831,9 +843,7 @@ static char *HandleNetworkingPackets() if (num_bytes == 0) return "Connection to network server lost!"; - nread += num_bytes; - - HandleNetworkingMessages(); + HandleNetworkingMessage(); if (stop_network_client) return stop_network_client_message;