3 * - Acess kernel emulation on another OS using SDL and UDP
12 # define _WIN32_WINNT 0x0501
14 # include <winsock2.h>
15 # include <ws2tcpip.h>
16 # define close(fd) closesocket(fd)
17 typedef int socklen_t;
20 # include <sys/socket.h>
21 # include <netinet/in.h>
22 # include <arpa/inet.h> // inet_ntop
24 #define DONT_INCLUDE_SYSCALL_NAMES
25 #include "../syscalls.h"
26 #include <logdebug.h> // acess but std
30 #define MAX_CLIENTS 16
35 SDL_Thread *WorkerThread;
39 tRequestHeader *CurrentRequest;
40 struct sockaddr_in ClientAddr;
47 extern tRequestHeader *SyscallRecieve(tRequestHeader *Request, int *ReturnLength);
48 extern int Threads_CreateRootProcess(void);
49 extern void Threads_SetThread(int TID);
50 extern void *Threads_GetThread(int TID);
51 extern void Threads_PostEvent(void *Thread, uint32_t Event);
54 tClient *Server_GetClient(int ClientID);
55 int Server_WorkerThread(void *ClientPtr);
56 int SyscallServer(void);
57 int Server_ListenThread(void *Unused);
62 SOCKET gSocket = INVALID_SOCKET;
64 # define INVALID_SOCKET -1
65 int gSocket = INVALID_SOCKET;
67 tClient gaServer_Clients[MAX_CLIENTS];
68 SDL_Thread *gpServer_ListenThread;
71 int Server_GetClientID(void)
74 Uint32 thisId = SDL_ThreadID();
76 for( i = 0; i < MAX_CLIENTS; i ++ )
78 if( SDL_GetThreadID(gaServer_Clients[i].WorkerThread) == thisId )
79 return gaServer_Clients[i].ClientID;
82 fprintf(stderr, "ERROR: Server_GetClientID - Thread is not allocated\n");
87 tClient *Server_GetClient(int ClientID)
92 // Allocate an ID if needed
94 ClientID = Threads_CreateRootProcess();
96 for( i = 0; i < MAX_CLIENTS; i ++ )
98 if( gaServer_Clients[i].ClientID == ClientID ) {
99 return &gaServer_Clients[i];
101 if(!ret && gaServer_Clients[i].ClientID == 0)
102 ret = &gaServer_Clients[i];
105 // Uh oh, no free slots
106 // TODO: Dynamic allocation
110 // Allocate a thread for the process
111 ret->ClientID = ClientID;
115 ret->CurrentRequest = NULL;
118 if( !ret->WorkerThread ) {
121 ret->WaitFlag = SDL_CreateCond();
122 ret->Mutex = SDL_CreateMutex();
123 SDL_mutexP( ret->Mutex );
125 Log_Debug("Server", "Creating worker for %p", ret);
126 ret->WorkerThread = SDL_CreateThread( Server_WorkerThread, ret );
132 int Server_WorkerThread(void *ClientPtr)
134 tClient *Client = ClientPtr;
136 Log_Debug("Server", "Worker %p", ClientPtr);
140 while( *((volatile typeof(Client->Socket)*)&Client->Socket) == 0 )
142 Threads_SetThread( Client->ClientID );
144 while( Client->ClientID != -1 )
147 int nfd = Client->Socket+1;
149 FD_SET(Client->Socket, &fds);
151 int rv = select(nfd, &fds, NULL, NULL, NULL); // TODO: Timeouts?
156 Log_Debug("Server", "%p: rv=%i", Client, rv);
158 if( FD_ISSET(Client->Socket, &fds) )
160 const int ciMaxParamCount = 6;
161 char lbuf[sizeof(tRequestHeader) + ciMaxParamCount*sizeof(tRequestValue)];
162 tRequestHeader *hdr = (void*)lbuf;
163 size_t len = recv(Client->Socket, (void*)hdr, sizeof(*hdr), 0);
164 Log_Debug("Server", "%i bytes of header", len);
165 if( len == 0 ) break;
167 perror("recv header");
168 // Log_Warning("Server", "recv() error - %s", strerror(errno));
171 if( len != sizeof(*hdr) ) {
173 Log_Warning("Server", "FD%i bad sized (%i != exp %i)",
174 Client->Socket, len, sizeof(*hdr));
178 if( hdr->NParams > ciMaxParamCount ) {
180 Log_Warning("Server", "FD%i too many params (%i > max %i)",
181 Client->Socket, hdr->NParams, ciMaxParamCount);
185 if( hdr->NParams > 0 )
187 len = recv(Client->Socket, (void*)hdr->Params, hdr->NParams*sizeof(tRequestValue), 0);
188 Log_Debug("Server", "%i bytes of params", len);
189 if( len != hdr->NParams*sizeof(tRequestValue) ) {
191 perror("recv params");
192 Log_Warning("Sever", "Recieving params failed");
198 Log_Debug("Server", "No params?");
202 size_t hdrsize = sizeof(tRequestHeader) + hdr->NParams*sizeof(tRequestValue);
203 size_t bufsize = hdrsize;
205 for( i = 0; i < hdr->NParams; i ++ )
207 if( hdr->Params[i].Flags & ARG_FLAG_ZEROED )
210 bufsize += hdr->Params[i].Length;
214 // Allocate full buffer
215 hdr = malloc(bufsize);
216 memcpy(hdr, lbuf, hdrsize);
217 if( bufsize > hdrsize )
219 size_t rem = bufsize - hdrsize;
220 char *ptr = (void*)( hdr->Params + hdr->NParams );
223 len = recv(Client->Socket, ptr, rem, 0);
224 Log_Debug("Server", "%i bytes of data", len);
228 Log_Warning("Sever", "Recieving data failed");
239 Log_Debug("Server", "no data");
242 tRequestHeader *retHeader;
243 retHeader = SyscallRecieve(hdr, &retlen);
245 // Some sort of error
246 Log_Warning("Server", "SyscallRecieve failed?");
250 send(Client->Socket, (void*)retHeader, retlen, 0);
257 tRequestHeader *retHeader;
258 tRequestHeader errorHeader;
261 int cur_client_id = 0;
262 while( Client->ClientID != -1 )
264 // Wait for something to do
265 if( Client->CurrentRequest == NULL )
266 SDL_CondWait(Client->WaitFlag, Client->Mutex);
267 if( Client->CurrentRequest == NULL )
270 // Log_Debug("AcessSrv", "Worker got message %p", Client->CurrentRequest);
272 if(Client->ClientID != cur_client_id) {
273 // Log_Debug("AcessSrv", "Client thread ID changed from %i to %i",
274 // cur_client_id, Client->ClientID);
275 Threads_SetThread( Client->ClientID );
276 cur_client_id = Client->ClientID;
281 int callid = Client->CurrentRequest->CallID;
282 Log_Debug("AcessSrv", "Client %i request %i %s",
283 Client->ClientID, callid,
284 callid < N_SYSCALLS ? casSYSCALL_NAMES[callid] : "UNK"
289 retHeader = SyscallRecieve(Client->CurrentRequest, &retSize);
292 // Return an error to the client
293 printf("ERROR: SyscallRecieve failed\n");
294 errorHeader.CallID = Client->CurrentRequest->CallID;
295 errorHeader.NParams = 0;
296 retHeader = &errorHeader;
297 retSize = sizeof(errorHeader);
301 retHeader->ClientID = Client->ClientID;
303 // Mark the thread as ready for another job
304 free(Client->CurrentRequest);
305 Client->CurrentRequest = 0;
307 // Log_Debug("AcessSrv", "Sending %i to %x:%i (Client %i)",
308 // retSize, ntohl(Client->ClientAddr.sin_addr.s_addr),
309 // ntohs(Client->ClientAddr.sin_port),
314 sentSize = sendto(gSocket, retHeader, retSize, 0,
315 (struct sockaddr*)&Client->ClientAddr, sizeof(Client->ClientAddr)
317 if( sentSize != retSize ) {
318 perror("Server_WorkerThread - send");
321 // Free allocated header
322 if( retHeader != &errorHeader )
326 Log_Notice("Server", "Terminated Worker %p", ClientPtr);
330 int SyscallServer(void)
332 struct sockaddr_in server;
335 /* Open windows connection */
336 if (WSAStartup(0x0101, &gWinsock) != 0)
338 fprintf(stderr, "Could not open Windows connection.\n");
344 // Open TCP Connection
345 gSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
347 // Open UDP Connection
348 gSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
350 if (gSocket == INVALID_SOCKET)
352 fprintf(stderr, "Could not create socket.\n");
359 // Set server address
360 memset(&server, 0, sizeof(struct sockaddr_in));
361 server.sin_family = AF_INET;
362 server.sin_port = htons(SERVER_PORT);
363 server.sin_addr.s_addr = htonl(INADDR_ANY);
366 if( bind(gSocket, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1 )
368 fprintf(stderr, "Cannot bind address to socket.\n");
369 perror("SyscallServer - bind");
371 closesocket(gSocket);
383 Log_Notice("AcessSrv", "Listening on 0.0.0.0:%i", SERVER_PORT);
384 gpServer_ListenThread = SDL_CreateThread( Server_ListenThread, NULL );
388 int Server_Shutdown(void)
391 for( int i = 0; i < MAX_CLIENTS; i ++ )
393 if( gaServer_Clients[i].ClientID == 0 )
395 Threads_PostEvent( Threads_GetThread(gaServer_Clients[i].ClientID), 0 );
396 gaServer_Clients[i].ClientID = -1;
398 close(gaServer_Clients[i].Socket);
400 SDL_CondSignal(gaServer_Clients[i].WaitFlag);
406 int Server_ListenThread(void *Unused)
408 // Wait for something to do :)
412 struct sockaddr_in clientaddr;
413 socklen_t clientSize = sizeof(clientaddr);
414 int clientSock = accept(gSocket, (struct sockaddr*)&clientaddr, &clientSize);
415 if( clientSock < 0 ) {
416 perror("SyscallServer - accept");
420 char addrstr[4*8+8+1];
421 getnameinfo((struct sockaddr*)&clientaddr, sizeof(clientaddr),
422 addrstr, sizeof(addrstr), NULL, 0, NI_NUMERICHOST);
423 Log_Debug("Server", "Client connection %s:%i", addrstr, ntohs(clientaddr.sin_port));
427 tRequestAuthHdr authhdr;
428 len = recv(clientSock, (void*)&authhdr, sizeof(authhdr), 0);
429 if( len != sizeof(authhdr) ) {
430 // Some form of error?
431 Log_Warning("Server", "Client auth block bad size (%i != exp %i)",
432 len, sizeof(authhdr));
437 Log_Debug("Server", "Client assumed PID %i", authhdr.pid);
440 if( authhdr.pid == 0 ) {
441 // Allocate PID and client structure/thread
442 client = Server_GetClient(0);
443 client->Socket = clientSock;
444 authhdr.pid = client->ClientID;
447 // Get client structure and make sure it's unused
448 // - Auth token / verifcation?
449 client = Server_GetClient(authhdr.pid);
451 Log_Warning("Server", "Can't allocate a client struct for %s:%i",
452 addrstr, clientaddr.sin_port);
456 if( client->Socket != 0 ) {
457 Log_Warning("Server", "Client (%i)%p owned by FD%i but %s:%i tried to use it",
458 authhdr.pid, client, addrstr, clientaddr.sin_port);
463 client->Socket = clientSock;
466 Log_Debug("Server", "Client given PID %i - info %p", authhdr.pid, client);
468 len = send(clientSock, (void*)&authhdr, sizeof(authhdr), 0);
469 if( len != sizeof(authhdr) ) {
470 // Ok, this is an error
471 perror("Sending auth reply");
474 // All done, client thread should be watching now
478 tRequestHeader *req = (void*)data;
479 struct sockaddr_in addr;
480 uint clientSize = sizeof(addr);
484 length = recvfrom(gSocket, data, BUFSIZ, 0, (struct sockaddr*)&addr, &clientSize);
487 perror("SyscallServer - recv");
491 // Hand off to a worker thread
492 // - TODO: Actually have worker threads
493 // Log_Debug("Server", "%i bytes from %x:%i", length,
494 // ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
496 client = Server_GetClient(req->ClientID);
497 // NOTE: Hack - Should check if all zero
498 if( req->ClientID == 0 || client->ClientAddr.sin_port == 0 )
500 memcpy(&client->ClientAddr, &addr, sizeof(addr));
502 else if( memcmp(&client->ClientAddr, &addr, sizeof(addr)) != 0 )
504 printf("ClientID %i used by %x:%i\n",
505 client->ClientID, ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
506 printf(" actually owned by %x:%i\n",
507 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
511 if( client->CurrentRequest ) {
512 printf("Worker thread for %x:%i is busy\n",
513 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
517 // Log_Debug("AcessSrv", "Message from Client %i (%p)",
518 // client->ClientID, client);
520 // Make a copy of the request data
521 req = malloc(length);
522 memcpy(req, data, length);
523 client->CurrentRequest = req;
524 SDL_CondSignal(client->WaitFlag);