void NET_Query_MasterResponse(net_packet_t *packet)
{
unsigned int packet_type;
unsigned int result;
if (!NET_ReadInt16(packet, &packet_type)
|| !NET_ReadInt16(packet, &result))
{
return;
}
if (packet_type == NET_MASTER_PACKET_TYPE_ADD_RESPONSE)
{
if (result != 0)
{
// Only show the message once.
if (!registered_with_master)
{
printf("Registered with master server at %s\n",
MASTER_SERVER_ADDRESS);
registered_with_master = true;
}
}
else
{
// Always show rejections.
printf("Failed to register with master server at %s\n",
MASTER_SERVER_ADDRESS);
}
got_master_response = true;
}
}
static net_packet_t *BlockForPacket(net_addr_t *addr, unsigned int packet_type,
unsigned int timeout_ms)
{
net_packet_t *packet;
net_addr_t *packet_src;
unsigned int read_packet_type;
unsigned int start_time;
start_time = I_GetTimeMS();
while (I_GetTimeMS() < start_time + timeout_ms)
{
if (!NET_RecvPacket(query_context, &packet_src, &packet))
{
I_Sleep(20);
continue;
}
if (packet_src == addr
&& NET_ReadInt16(packet, &read_packet_type)
&& packet_type == read_packet_type)
{
return packet;
}
NET_FreePacket(packet);
}
// Timeout - no response.
return NULL;
}
static void NET_SV_MasterPacket(net_packet_t *packet)
{
unsigned int packet_type;
// Read the packet type
if (!NET_ReadInt16(packet, &packet_type))
{
NET_Log("server: error: no packet type in master server message");
return;
}
NET_Log("server: packet from master server; type %d", packet_type);
NET_LogPacket(packet);
switch (packet_type)
{
case NET_MASTER_PACKET_TYPE_ADD_RESPONSE:
NET_Query_AddResponse(packet);
break;
case NET_MASTER_PACKET_TYPE_NAT_HOLE_PUNCH:
NET_SV_ParseHolePunch(packet);
break;
}
}
static void NET_CL_ParsePacket(net_packet_t *packet)
{
unsigned int packet_type;
if (!NET_ReadInt16(packet, &packet_type))
{
return;
}
if (NET_Conn_Packet(&client_connection, packet, &packet_type))
{
// Packet eaten by the common connection code
}
else
{
switch (packet_type)
{
case NET_PACKET_TYPE_WAITING_DATA:
NET_CL_ParseWaitingData(packet);
break;
case NET_PACKET_TYPE_LAUNCH:
NET_CL_ParseLaunch(packet);
break;
case NET_PACKET_TYPE_GAMESTART:
NET_CL_ParseGameStart(packet);
break;
case NET_PACKET_TYPE_GAMEDATA:
NET_CL_ParseGameData(packet);
break;
case NET_PACKET_TYPE_GAMEDATA_RESEND:
NET_CL_ParseResendRequest(packet);
break;
case NET_PACKET_TYPE_CONSOLE_MESSAGE:
NET_CL_ParseConsoleMessage(packet);
break;
default:
break;
}
}
}
static void NET_Query_ParseMasterResponse(net_addr_t *master_addr,
net_packet_t *packet)
{
unsigned int packet_type;
query_target_t *target;
char *addr_str;
net_addr_t *addr;
// Read the header. We are only interested in query responses.
if (!NET_ReadInt16(packet, &packet_type)
|| packet_type != NET_MASTER_PACKET_TYPE_QUERY_RESPONSE)
{
return;
}
// Read a list of strings containing the addresses of servers
// that the master knows about.
for (;;)
{
addr_str = NET_ReadString(packet);
if (addr_str == NULL)
{
break;
}
// Resolve address and add to targets list if it is not already
// there.
addr = NET_ResolveAddress(query_context, addr_str);
if (addr != NULL)
{
GetTargetForAddr(addr, true);
}
}
// Mark the master as having responded.
target = GetTargetForAddr(master_addr, true);
target->state = QUERY_TARGET_RESPONDED;
}
static void NET_Query_ParseResponse(net_addr_t *addr, net_packet_t *packet,
net_query_callback_t callback,
void *user_data)
{
unsigned int packet_type;
net_querydata_t querydata;
query_target_t *target;
// Read the header
if (!NET_ReadInt16(packet, &packet_type)
|| packet_type != NET_PACKET_TYPE_QUERY_RESPONSE)
{
return;
}
// Read query data
if (!NET_ReadQueryData(packet, &querydata))
{
return;
}
// Find the target that responded.
target = GetTargetForAddr(addr, false);
// If the target is not found, it may be because we are doing
// a LAN broadcast search, in which case we need to create a
// target for the new responder.
if (target == NULL)
{
query_target_t *broadcast_target;
broadcast_target = GetTargetForAddr(NULL, false);
// Not in broadcast mode, unexpected response that came out
// of nowhere. Ignore.
if (broadcast_target == NULL
|| broadcast_target->state != QUERY_TARGET_QUERIED)
{
return;
}
// Create new target.
target = GetTargetForAddr(addr, true);
target->state = QUERY_TARGET_QUERIED;
target->query_time = broadcast_target->query_time;
}
if (target->state != QUERY_TARGET_RESPONDED)
{
target->state = QUERY_TARGET_RESPONDED;
memcpy(&target->data, &querydata, sizeof(net_querydata_t));
// Calculate RTT.
target->ping_time = I_GetTimeMS() - target->query_time;
// Invoke callback to signal that we have a new address.
callback(addr, &target->data, target->ping_time, user_data);
}
}
static void NET_SV_ParseSYN(net_packet_t *packet,
net_client_t *client,
net_addr_t *addr)
{
unsigned int magic;
unsigned int cl_gamemode, cl_gamemission;
unsigned int cl_recording_lowres;
unsigned int cl_drone;
unsigned int is_freedoom;
md5_digest_t deh_md5sum, wad_md5sum;
char *player_name;
char *client_version;
int i;
// read the magic number
if (!NET_ReadInt32(packet, &magic))
{
return;
}
if (magic != NET_MAGIC_NUMBER)
{
// invalid magic number
return;
}
// Check the client version is the same as the server
client_version = NET_ReadString(packet);
if (client_version == NULL)
{
return;
}
if (strcmp(client_version, PACKAGE_STRING) != 0)
{
//!
// @category net
//
// When running a netgame server, ignore version mismatches between
// the server and the client. Using this option may cause game
// desyncs to occur, or differences in protocol may mean the netgame
// will simply not function at all.
//
if (M_CheckParm("-ignoreversion") == 0)
{
NET_SV_SendReject(addr,
"Version mismatch: server version is: "
PACKAGE_STRING);
return;
}
}
// read the game mode and mission
if (!NET_ReadInt16(packet, &cl_gamemode)
|| !NET_ReadInt16(packet, &cl_gamemission)
|| !NET_ReadInt8(packet, &cl_recording_lowres)
|| !NET_ReadInt8(packet, &cl_drone)
|| !NET_ReadMD5Sum(packet, wad_md5sum)
|| !NET_ReadMD5Sum(packet, deh_md5sum)
|| !NET_ReadInt8(packet, &is_freedoom))
{
return;
}
if (!NET_ValidGameMode(cl_gamemode, cl_gamemission))
{
return;
}
// read the player's name
player_name = NET_ReadString(packet);
if (player_name == NULL)
{
return;
}
// received a valid SYN
// not accepting new connections?
if (server_state != SERVER_WAITING_START)
{
NET_SV_SendReject(addr, "Server is not currently accepting connections");
return;
}
// allocate a client slot if there isn't one already
if (client == NULL)
{
// find a slot, or return if none found
for (i=0; i<MAXNETNODES; ++i)
{
if (!clients[i].active)
{
client = &clients[i];
break;
}
}
if (client == NULL)
{
return;
}
}
else
{
// If this is a recently-disconnected client, deactivate
// to allow immediate reconnection
if (client->connection.state == NET_CONN_STATE_DISCONNECTED)
{
client->active = false;
}
}
// New client?
if (!client->active)
{
int num_players;
// Before accepting a new client, check that there is a slot
// free
NET_SV_AssignPlayers();
num_players = NET_SV_NumPlayers();
if ((!cl_drone && num_players >= MAXPLAYERS)
|| NET_SV_NumClients() >= MAXNETNODES)
{
NET_SV_SendReject(addr, "Server is full!");
return;
}
// TODO: Add server option to allow rejecting clients which
// set lowres_turn. This is potentially desirable as the
// presence of such clients affects turning resolution.
// Adopt the game mode and mission of the first connecting client
if (num_players == 0 && !cl_drone)
{
sv_gamemode = cl_gamemode;
sv_gamemission = cl_gamemission;
}
// Save the MD5 checksums
memcpy(client->wad_md5sum, wad_md5sum, sizeof(md5_digest_t));
memcpy(client->deh_md5sum, deh_md5sum, sizeof(md5_digest_t));
client->is_freedoom = is_freedoom;
// Check the connecting client is playing the same game as all
// the other clients
if (cl_gamemode != sv_gamemode || cl_gamemission != sv_gamemission)
{
NET_SV_SendReject(addr, "You are playing the wrong game!");
return;
}
// Activate, initialize connection
NET_SV_InitNewClient(client, addr, player_name);
client->recording_lowres = cl_recording_lowres;
client->drone = cl_drone;
}
if (client->connection.state == NET_CONN_STATE_WAITING_ACK)
{
// force an acknowledgement
client->connection.last_send_time = -1;
}
}
static void NET_SV_Packet(net_packet_t *packet, net_addr_t *addr)
{
net_client_t *client;
unsigned int packet_type;
// Response from master server?
if (addr != NULL && addr == master_server)
{
NET_Query_MasterResponse(packet);
return;
}
// Find which client this packet came from
client = NET_SV_FindClient(addr);
// Read the packet type
if (!NET_ReadInt16(packet, &packet_type))
{
// no packet type
return;
}
if (packet_type == NET_PACKET_TYPE_SYN)
{
NET_SV_ParseSYN(packet, client, addr);
}
else if (packet_type == NET_PACKET_TYPE_QUERY)
{
NET_SV_SendQueryResponse(addr);
}
else if (client == NULL)
{
// Must come from a valid client; ignore otherwise
}
else if (NET_Conn_Packet(&client->connection, packet, &packet_type))
{
// Packet was eaten by the common connection code
}
else
{
//printf("SV: %s: %i\n", NET_AddrToString(addr), packet_type);
switch (packet_type)
{
case NET_PACKET_TYPE_GAMESTART:
NET_SV_ParseGameStart(packet, client);
break;
case NET_PACKET_TYPE_GAMEDATA:
NET_SV_ParseGameData(packet, client);
break;
case NET_PACKET_TYPE_GAMEDATA_ACK:
NET_SV_ParseGameDataACK(packet, client);
break;
case NET_PACKET_TYPE_GAMEDATA_RESEND:
NET_SV_ParseResendRequest(packet, client);
break;
default:
// unknown packet type
break;
}
}
// If this address is not in the list of clients, be sure to
// free it back.
if (NET_SV_FindClient(addr) == NULL)
{
NET_FreeAddress(addr);
}
}
static void NET_SV_Packet(net_packet_t *packet, net_addr_t *addr)
{
net_client_t *client;
unsigned int packet_type;
// Response from master server?
if (addr != NULL && addr == master_server)
{
NET_SV_MasterPacket(packet);
return;
}
// Find which client this packet came from
client = NET_SV_FindClient(addr);
// Read the packet type
if (!NET_ReadInt16(packet, &packet_type))
{
// no packet type
return;
}
NET_Log("server: packet from %s; type %d", NET_AddrToString(addr),
packet_type & ~NET_RELIABLE_PACKET);
NET_LogPacket(packet);
if (packet_type == NET_PACKET_TYPE_SYN)
{
NET_SV_ParseSYN(packet, client, addr);
}
else if (packet_type == NET_PACKET_TYPE_QUERY)
{
NET_SV_SendQueryResponse(addr);
}
else if (client == NULL)
{
// Must come from a valid client; ignore otherwise
}
else if (NET_Conn_Packet(&client->connection, packet, &packet_type))
{
// Packet was eaten by the common connection code
}
else
{
//printf("SV: %s: %i\n", NET_AddrToString(addr), packet_type);
switch (packet_type)
{
case NET_PACKET_TYPE_GAMESTART:
NET_SV_ParseGameStart(packet, client);
break;
case NET_PACKET_TYPE_LAUNCH:
NET_SV_ParseLaunch(packet, client);
break;
case NET_PACKET_TYPE_GAMEDATA:
NET_SV_ParseGameData(packet, client);
break;
case NET_PACKET_TYPE_GAMEDATA_ACK:
NET_SV_ParseGameDataACK(packet, client);
break;
case NET_PACKET_TYPE_GAMEDATA_RESEND:
NET_SV_ParseResendRequest(packet, client);
break;
default:
// unknown packet type
break;
}
}
}
