3 * - Acess kernel emulation on another OS using SDL and UDP
16 # include <sys/socket.h>
17 # include <netinet/in.h>
18 # include <arpa/inet.h> // inet_ntop
20 #include "../syscalls.h"
24 #define MAX_CLIENTS 16
29 SDL_Thread *WorkerThread;
33 tRequestHeader *CurrentRequest;
34 struct sockaddr_in ClientAddr;
41 extern tRequestHeader *SyscallRecieve(tRequestHeader *Request, int *ReturnLength);
42 extern int Threads_CreateRootProcess(void);
43 extern void Threads_SetThread(int TID);
44 // HACK: Should have these in a header
45 extern void Log_Debug(const char *Subsys, const char *Message, ...);
46 extern void Log_Notice(const char *Subsys, const char *Message, ...);
47 extern void Log_Warning(const char *Subsys, const char *Message, ...);
50 tClient *Server_GetClient(int ClientID);
51 int Server_WorkerThread(void *ClientPtr);
52 int SyscallServer(void);
53 int Server_ListenThread(void *Unused);
58 SOCKET gSocket = INVALID_SOCKET;
60 # define INVALID_SOCKET -1
61 int gSocket = INVALID_SOCKET;
63 tClient gaServer_Clients[MAX_CLIENTS];
64 SDL_Thread *gpServer_ListenThread;
67 int Server_GetClientID(void)
70 Uint32 thisId = SDL_ThreadID();
72 for( i = 0; i < MAX_CLIENTS; i ++ )
74 if( SDL_GetThreadID(gaServer_Clients[i].WorkerThread) == thisId )
75 return gaServer_Clients[i].ClientID;
78 fprintf(stderr, "ERROR: Server_GetClientID - Thread is not allocated\n");
83 tClient *Server_GetClient(int ClientID)
88 // Allocate an ID if needed
90 ClientID = Threads_CreateRootProcess();
92 for( i = 0; i < MAX_CLIENTS; i ++ )
94 if( gaServer_Clients[i].ClientID == ClientID ) {
95 return &gaServer_Clients[i];
97 if(!ret && gaServer_Clients[i].ClientID == 0)
98 ret = &gaServer_Clients[i];
101 // Uh oh, no free slots
102 // TODO: Dynamic allocation
106 // Allocate a thread for the process
107 ret->ClientID = ClientID;
111 ret->CurrentRequest = NULL;
114 if( !ret->WorkerThread ) {
117 ret->WaitFlag = SDL_CreateCond();
118 ret->Mutex = SDL_CreateMutex();
119 SDL_mutexP( ret->Mutex );
121 Log_Debug("Server", "Creating worker for %p", ret);
122 ret->WorkerThread = SDL_CreateThread( Server_WorkerThread, ret );
128 int Server_WorkerThread(void *ClientPtr)
130 tClient *Client = ClientPtr;
132 Log_Debug("Server", "Worker %p", ClientPtr);
136 while( *((volatile typeof(Client->Socket)*)&Client->Socket) == 0 )
138 Threads_SetThread( Client->ClientID );
143 int nfd = Client->Socket+1;
145 FD_SET(Client->Socket, &fds);
147 int rv = select(nfd, &fds, NULL, NULL, NULL); // TODO: Timeouts?
152 Log_Debug("Server", "%p: rv=%i", Client, rv);
154 if( FD_ISSET(Client->Socket, &fds) )
156 const int ciMaxParamCount = 6;
157 char lbuf[sizeof(tRequestHeader) + ciMaxParamCount*sizeof(tRequestValue)];
158 tRequestHeader *hdr = (void*)lbuf;
159 size_t len = recv(Client->Socket, hdr, sizeof(*hdr), 0);
160 Log_Debug("Server", "%i bytes of header", len);
161 if( len == 0 ) break;
162 if( len != sizeof(*hdr) ) {
164 Log_Warning("Server", "FD%i bad sized (%i != exp %i)",
165 Client->Socket, len, sizeof(*hdr));
169 if( hdr->NParams > ciMaxParamCount ) {
171 Log_Warning("Server", "FD%i too many params (%i > max %i)",
172 Client->Socket, hdr->NParams, ciMaxParamCount);
176 len = recv(Client->Socket, hdr->Params, hdr->NParams*sizeof(tRequestValue), 0);
177 Log_Debug("Server", "%i bytes of params", len);
178 if( len != hdr->NParams*sizeof(tRequestValue) ) {
183 size_t hdrsize = sizeof(tRequestHeader) + hdr->NParams*sizeof(tRequestValue);
184 size_t bufsize = hdrsize;
186 for( i = 0; i < hdr->NParams; i ++ )
188 if( hdr->Params[i].Flags & ARG_FLAG_ZEROED )
191 bufsize += hdr->Params[i].Length;
195 // Allocate full buffer
196 hdr = malloc(bufsize);
197 memcpy(hdr, lbuf, hdrsize);
198 if( bufsize > hdrsize )
200 len = recv(Client->Socket, hdr->Params + hdr->NParams, bufsize - hdrsize, 0);
201 Log_Debug("Server", "%i bytes of data", len);
202 if( len != bufsize - hdrsize ) {
207 Log_Debug("Server", "no data");
210 tRequestHeader *retHeader;
211 retHeader = SyscallRecieve(hdr, &retlen);
213 // Some sort of error
214 Log_Warning("Server", "SyscallRecieve failed?");
218 send(Client->Socket, retHeader, retlen, 0);
225 tRequestHeader *retHeader;
226 tRequestHeader errorHeader;
229 int cur_client_id = 0;
232 // Wait for something to do
233 while( Client->CurrentRequest == NULL )
234 SDL_CondWait(Client->WaitFlag, Client->Mutex);
236 // Log_Debug("AcessSrv", "Worker got message %p", Client->CurrentRequest);
238 if(Client->ClientID != cur_client_id) {
239 // Log_Debug("AcessSrv", "Client thread ID changed from %i to %i",
240 // cur_client_id, Client->ClientID);
241 Threads_SetThread( Client->ClientID );
242 cur_client_id = Client->ClientID;
247 int callid = Client->CurrentRequest->CallID;
248 Log_Debug("AcessSrv", "Client %i request %i %s",
249 Client->ClientID, callid,
250 callid < N_SYSCALLS ? casSYSCALL_NAMES[callid] : "UNK"
255 retHeader = SyscallRecieve(Client->CurrentRequest, &retSize);
258 // Return an error to the client
259 printf("ERROR: SyscallRecieve failed\n");
260 errorHeader.CallID = Client->CurrentRequest->CallID;
261 errorHeader.NParams = 0;
262 retHeader = &errorHeader;
263 retSize = sizeof(errorHeader);
267 retHeader->ClientID = Client->ClientID;
269 // Mark the thread as ready for another job
270 free(Client->CurrentRequest);
271 Client->CurrentRequest = 0;
273 // Log_Debug("AcessSrv", "Sending %i to %x:%i (Client %i)",
274 // retSize, ntohl(Client->ClientAddr.sin_addr.s_addr),
275 // ntohs(Client->ClientAddr.sin_port),
280 sentSize = sendto(gSocket, retHeader, retSize, 0,
281 (struct sockaddr*)&Client->ClientAddr, sizeof(Client->ClientAddr)
283 if( sentSize != retSize ) {
284 perror("Server_WorkerThread - send");
287 // Free allocated header
288 if( retHeader != &errorHeader )
292 Log_Notice("Server", "Terminated Worker %p", ClientPtr);
296 int SyscallServer(void)
298 struct sockaddr_in server;
301 /* Open windows connection */
302 if (WSAStartup(0x0101, &gWinsock) != 0)
304 fprintf(stderr, "Could not open Windows connection.\n");
310 // Open TCP Connection
311 gSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
313 // Open UDP Connection
314 gSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
316 if (gSocket == INVALID_SOCKET)
318 fprintf(stderr, "Could not create socket.\n");
325 // Set server address
326 memset(&server, 0, sizeof(struct sockaddr_in));
327 server.sin_family = AF_INET;
328 server.sin_port = htons(SERVER_PORT);
329 server.sin_addr.s_addr = htonl(INADDR_ANY);
332 if( bind(gSocket, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1 )
334 fprintf(stderr, "Cannot bind address to socket.\n");
335 perror("SyscallServer - bind");
337 closesocket(gSocket);
349 Log_Notice("AcessSrv", "Listening on 0.0.0.0:%i", SERVER_PORT);
350 gpServer_ListenThread = SDL_CreateThread( Server_ListenThread, NULL );
354 int Server_ListenThread(void *Unused)
356 // Wait for something to do :)
360 struct sockaddr_in clientaddr;
361 socklen_t clientSize = sizeof(clientaddr);
362 int clientSock = accept(gSocket, (struct sockaddr*)&clientaddr, &clientSize);
363 if( clientSock < 0 ) {
364 perror("SyscallServer - accept");
368 char addrstr[4*8+8+1];
369 inet_ntop(clientaddr.sin_family, &clientaddr.sin_addr, addrstr, sizeof(addrstr));
370 Log_Debug("Server", "Client connection %s:%i", addrstr, ntohs(clientaddr.sin_port));
374 tRequestAuthHdr authhdr;
375 len = recv(clientSock, &authhdr, sizeof(authhdr), 0);
376 if( len != sizeof(authhdr) ) {
377 // Some form of error?
378 Log_Warning("Server", "Client auth block bad size (%i != exp %i)",
379 len, sizeof(authhdr));
384 Log_Debug("Server", "Client assumed PID %i", authhdr.pid);
387 if( authhdr.pid == 0 ) {
388 // Allocate PID and client structure/thread
389 client = Server_GetClient(0);
390 client->Socket = clientSock;
391 authhdr.pid = client->ClientID;
394 // Get client structure and make sure it's unused
395 // - Auth token / verifcation?
396 client = Server_GetClient(authhdr.pid);
398 Log_Warning("Server", "Can't allocate a client struct for %s:%i",
399 addrstr, clientaddr.sin_port);
403 if( client->Socket != 0 ) {
404 Log_Warning("Server", "Client (%i)%p owned by FD%i but %s:%i tried to use it",
405 authhdr.pid, client, addrstr, clientaddr.sin_port);
410 client->Socket = clientSock;
413 Log_Debug("Server", "Client given PID %i - info %p", authhdr.pid, client);
415 len = send(clientSock, &authhdr, sizeof(authhdr), 0);
416 if( len != sizeof(authhdr) ) {
417 // Ok, this is an error
418 perror("Sending auth reply");
421 // All done, client thread should be watching now
425 tRequestHeader *req = (void*)data;
426 struct sockaddr_in addr;
427 uint clientSize = sizeof(addr);
431 length = recvfrom(gSocket, data, BUFSIZ, 0, (struct sockaddr*)&addr, &clientSize);
434 perror("SyscallServer - recv");
438 // Hand off to a worker thread
439 // - TODO: Actually have worker threads
440 // Log_Debug("Server", "%i bytes from %x:%i", length,
441 // ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
443 client = Server_GetClient(req->ClientID);
444 // NOTE: Hack - Should check if all zero
445 if( req->ClientID == 0 || client->ClientAddr.sin_port == 0 )
447 memcpy(&client->ClientAddr, &addr, sizeof(addr));
449 else if( memcmp(&client->ClientAddr, &addr, sizeof(addr)) != 0 )
451 printf("ClientID %i used by %x:%i\n",
452 client->ClientID, ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
453 printf(" actually owned by %x:%i\n",
454 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
458 if( client->CurrentRequest ) {
459 printf("Worker thread for %x:%i is busy\n",
460 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
464 // Log_Debug("AcessSrv", "Message from Client %i (%p)",
465 // client->ClientID, client);
467 // Make a copy of the request data
468 req = malloc(length);
469 memcpy(req, data, length);
470 client->CurrentRequest = req;
471 SDL_CondSignal(client->WaitFlag);