3 * - Acess kernel emulation on another OS using SDL and UDP
16 # include <sys/socket.h>
17 # include <netinet/in.h>
19 #include "../syscalls.h"
23 #define MAX_CLIENTS 16
28 SDL_Thread *WorkerThread;
31 tRequestHeader *CurrentRequest;
32 struct sockaddr_in ClientAddr;
39 extern tRequestHeader *SyscallRecieve(tRequestHeader *Request, int *ReturnLength);
40 extern int Threads_CreateRootProcess(void);
41 extern void Threads_SetThread(int TID);
42 // HACK: Should have these in a header
43 extern void Log_Debug(const char *Subsys, const char *Message, ...);
44 extern void Log_Notice(const char *Subsys, const char *Message, ...);
47 tClient *Server_GetClient(int ClientID);
48 int Server_WorkerThread(void *ClientPtr);
49 int SyscallServer(void);
50 int Server_ListenThread(void *Unused);
55 SOCKET gSocket = INVALID_SOCKET;
57 # define INVALID_SOCKET -1
58 int gSocket = INVALID_SOCKET;
60 tClient gaServer_Clients[MAX_CLIENTS];
61 SDL_Thread *gpServer_ListenThread;
64 int Server_GetClientID(void)
67 Uint32 thisId = SDL_ThreadID();
69 for( i = 0; i < MAX_CLIENTS; i ++ )
71 if( SDL_GetThreadID(gaServer_Clients[i].WorkerThread) == thisId )
72 return gaServer_Clients[i].ClientID;
75 fprintf(stderr, "ERROR: Server_GetClientID - Thread is not allocated\n");
80 tClient *Server_GetClient(int ClientID)
85 // Allocate an ID if needed
87 ClientID = Threads_CreateRootProcess();
89 for( i = 0; i < MAX_CLIENTS; i ++ )
91 if( gaServer_Clients[i].ClientID == ClientID ) {
92 return &gaServer_Clients[i];
94 if(!ret && gaServer_Clients[i].ClientID == 0)
95 ret = &gaServer_Clients[i];
98 // Uh oh, no free slots
99 // TODO: Dynamic allocation
103 // Allocate a thread for the process
104 ret->ClientID = ClientID;
105 ret->CurrentRequest = NULL;
107 if( !ret->WorkerThread ) {
108 ret->WaitFlag = SDL_CreateCond();
109 ret->Mutex = SDL_CreateMutex();
110 SDL_mutexP( ret->Mutex );
111 ret->WorkerThread = SDL_CreateThread( Server_WorkerThread, ret );
117 int Server_WorkerThread(void *ClientPtr)
119 tClient *Client = ClientPtr;
120 tRequestHeader *retHeader;
121 tRequestHeader errorHeader;
124 int cur_client_id = 0;
130 // Wait for something to do
131 while( Client->CurrentRequest == NULL )
132 SDL_CondWait(Client->WaitFlag, Client->Mutex);
134 if(Client->ClientID != cur_client_id) {
135 Threads_SetThread( Client->ClientID );
136 cur_client_id = Client->ClientID;
140 retHeader = SyscallRecieve(Client->CurrentRequest, &retSize);
142 Log_Debug("AcessSrv", "Client %i request %i",
143 Client->ClientID, Client->CurrentRequest->CallID);
147 // Return an error to the client
148 printf("ERROR: SyscallRecieve failed\n");
149 errorHeader.CallID = Client->CurrentRequest->CallID;
150 errorHeader.NParams = 0;
151 retHeader = &errorHeader;
152 retSize = sizeof(errorHeader);
156 retHeader->ClientID = Client->ClientID;
158 // Mark the thread as ready for another job
159 Client->CurrentRequest = 0;
161 Log_Debug("AcessSrv", "Sending %i to %x:%i (Client %i)",
162 retSize, ntohl(Client->ClientAddr.sin_addr.s_addr),
163 ntohs(Client->ClientAddr.sin_port),
168 sentSize = sendto(gSocket, retHeader, retSize, 0,
169 (struct sockaddr*)&Client->ClientAddr, sizeof(Client->ClientAddr)
171 if( sentSize != retSize ) {
172 perror("Server_WorkerThread - send");
175 // Free allocated header
176 if( retHeader != &errorHeader )
182 int SyscallServer(void)
184 struct sockaddr_in server;
187 /* Open windows connection */
188 if (WSAStartup(0x0101, &gWinsock) != 0)
190 fprintf(stderr, "Could not open Windows connection.\n");
196 // Open TCP Connection
197 gSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
199 // Open UDP Connection
200 gSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
202 if (gSocket == INVALID_SOCKET)
204 fprintf(stderr, "Could not create socket.\n");
211 // Set server address
212 memset(&server, 0, sizeof(struct sockaddr_in));
213 server.sin_family = AF_INET;
214 server.sin_port = htons(SERVER_PORT);
215 server.sin_addr.s_addr = htonl(INADDR_ANY);
218 if( bind(gSocket, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1 )
220 fprintf(stderr, "Cannot bind address to socket.\n");
221 perror("SyscallServer - bind");
223 closesocket(gSocket);
235 Log_Notice("AcessSrv", "Listening on 0.0.0.0:%i", SERVER_PORT);
236 gpServer_ListenThread = SDL_CreateThread( Server_ListenThread, NULL );
240 int Server_ListenThread(void *Unused)
242 // Wait for something to do :)
246 struct sockaddr_in client;
247 uint clientSize = sizeof(client);
248 int clientSock = accept(gSocket, (struct sockaddr*)&client, &clientSize);
249 if( clientSock < 0 ) {
250 perror("SyscallServer - accept");
254 Log("Client connection %x:%i\n",
255 ntohl(client.sin_addr), ntohs(client.sin_port)
260 tRequestHeader *req = (void*)data;
261 struct sockaddr_in addr;
262 uint clientSize = sizeof(addr);
266 length = recvfrom(gSocket, data, BUFSIZ, 0, (struct sockaddr*)&addr, &clientSize);
269 perror("SyscallServer - recv");
273 // Hand off to a worker thread
274 // - TODO: Actually have worker threads
275 printf("%i bytes from %x:%i\n", length,
276 ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
278 client = Server_GetClient(req->ClientID);
279 // NOTE: Hack - Should check if all zero
280 if( req->ClientID == 0 || client->ClientAddr.sin_port == 0 )
282 memcpy(&client->ClientAddr, &addr, sizeof(addr));
284 else if( memcmp(&client->ClientAddr, &addr, sizeof(addr)) != 0 )
286 printf("ClientID %i used by %x:%i\n",
287 client->ClientID, ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
288 printf(" actually owned by %x:%i\n",
289 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
293 if( client->CurrentRequest ) {
294 printf("Worker thread for %x:%i is busy\n",
295 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
299 Log_Debug("AcessSrv", "Message from Client %i (%p)",
300 client->ClientID, client);
302 client->CurrentRequest = req;
303 SDL_CondSignal(client->WaitFlag);