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
23 # include "include/windows_helpers.h"
25 #define DONT_INCLUDE_SYSCALL_NAMES
26 #include "../syscalls.h"
27 #include <logdebug.h> // acess but std
31 #define MAX_CLIENTS 16
36 SDL_Thread *WorkerThread;
40 tRequestHeader *CurrentRequest;
41 struct sockaddr_in ClientAddr;
48 extern tRequestHeader *SyscallRecieve(tRequestHeader *Request, int *ReturnLength);
49 extern int Threads_CreateRootProcess(void);
50 extern void Threads_SetThread(int TID);
51 extern void *Threads_GetThread(int TID);
52 extern void Threads_PostEvent(void *Thread, uint32_t Event);
55 tClient *Server_GetClient(int ClientID);
56 int Server_WorkerThread(void *ClientPtr);
57 int SyscallServer(void);
58 int Server_ListenThread(void *Unused);
63 SOCKET gSocket = INVALID_SOCKET;
65 # define INVALID_SOCKET -1
66 int gSocket = INVALID_SOCKET;
68 tClient gaServer_Clients[MAX_CLIENTS];
69 SDL_Thread *gpServer_ListenThread;
72 int Server_GetClientID(void)
75 Uint32 thisId = SDL_ThreadID();
77 for( i = 0; i < MAX_CLIENTS; i ++ )
79 if( SDL_GetThreadID(gaServer_Clients[i].WorkerThread) == thisId )
80 return gaServer_Clients[i].ClientID;
83 fprintf(stderr, "ERROR: Server_GetClientID - Thread is not allocated\n");
88 tClient *Server_GetClient(int ClientID)
93 // Allocate an ID if needed
95 ClientID = Threads_CreateRootProcess();
97 for( i = 0; i < MAX_CLIENTS; i ++ )
99 if( gaServer_Clients[i].ClientID == ClientID ) {
100 return &gaServer_Clients[i];
102 if(!ret && gaServer_Clients[i].ClientID == 0)
103 ret = &gaServer_Clients[i];
106 // Uh oh, no free slots
107 // TODO: Dynamic allocation
111 // Allocate a thread for the process
112 ret->ClientID = ClientID;
116 ret->CurrentRequest = NULL;
119 if( !ret->WorkerThread ) {
122 ret->WaitFlag = SDL_CreateCond();
123 ret->Mutex = SDL_CreateMutex();
124 SDL_mutexP( ret->Mutex );
126 Log_Debug("Server", "Creating worker for %p", ret);
127 ret->WorkerThread = SDL_CreateThread( Server_WorkerThread, ret );
133 int Server_WorkerThread(void *ClientPtr)
135 tClient *Client = ClientPtr;
137 Log_Debug("Server", "Worker %p", ClientPtr);
141 while( *((volatile typeof(Client->Socket)*)&Client->Socket) == 0 )
143 Threads_SetThread( Client->ClientID );
145 while( Client->ClientID != -1 )
148 int nfd = Client->Socket+1;
150 FD_SET(Client->Socket, &fds);
152 int rv = select(nfd, &fds, NULL, NULL, NULL); // TODO: Timeouts?
157 Log_Debug("Server", "%p: rv=%i", Client, rv);
159 if( FD_ISSET(Client->Socket, &fds) )
161 const int ciMaxParamCount = 6;
162 char lbuf[sizeof(tRequestHeader) + ciMaxParamCount*sizeof(tRequestValue)];
163 tRequestHeader *hdr = (void*)lbuf;
164 size_t len = recv(Client->Socket, (void*)hdr, sizeof(*hdr), 0);
165 Log_Debug("Server", "%i bytes of header", len);
166 if( len == 0 ) break;
168 perror("recv header");
169 // Log_Warning("Server", "recv() error - %s", strerror(errno));
172 if( len != sizeof(*hdr) ) {
174 Log_Warning("Server", "FD%i bad sized (%i != exp %i)",
175 Client->Socket, len, sizeof(*hdr));
179 if( hdr->NParams > ciMaxParamCount ) {
181 Log_Warning("Server", "FD%i too many params (%i > max %i)",
182 Client->Socket, hdr->NParams, ciMaxParamCount);
186 if( hdr->NParams > 0 )
188 len = recv(Client->Socket, (void*)hdr->Params, hdr->NParams*sizeof(tRequestValue), 0);
189 Log_Debug("Server", "%i bytes of params", len);
190 if( len != hdr->NParams*sizeof(tRequestValue) ) {
192 perror("recv params");
193 Log_Warning("Sever", "Recieving params failed");
199 Log_Debug("Server", "No params?");
203 size_t hdrsize = sizeof(tRequestHeader) + hdr->NParams*sizeof(tRequestValue);
204 size_t bufsize = hdrsize;
206 for( i = 0; i < hdr->NParams; i ++ )
208 if( hdr->Params[i].Flags & ARG_FLAG_ZEROED )
211 bufsize += hdr->Params[i].Length;
215 // Allocate full buffer
216 hdr = malloc(bufsize);
217 memcpy(hdr, lbuf, hdrsize);
218 if( bufsize > hdrsize )
220 size_t rem = bufsize - hdrsize;
221 char *ptr = (void*)( hdr->Params + hdr->NParams );
224 len = recv(Client->Socket, ptr, rem, 0);
225 Log_Debug("Server", "%i bytes of data", len);
229 Log_Warning("Sever", "Recieving data failed");
240 Log_Debug("Server", "no data");
243 tRequestHeader *retHeader;
244 retHeader = SyscallRecieve(hdr, &retlen);
246 // Some sort of error
247 Log_Warning("Server", "SyscallRecieve failed?");
251 send(Client->Socket, (void*)retHeader, retlen, 0);
258 tRequestHeader *retHeader;
259 tRequestHeader errorHeader;
262 int cur_client_id = 0;
263 while( Client->ClientID != -1 )
265 // Wait for something to do
266 if( Client->CurrentRequest == NULL )
267 SDL_CondWait(Client->WaitFlag, Client->Mutex);
268 if( Client->CurrentRequest == NULL )
271 // Log_Debug("AcessSrv", "Worker got message %p", Client->CurrentRequest);
273 if(Client->ClientID != cur_client_id) {
274 // Log_Debug("AcessSrv", "Client thread ID changed from %i to %i",
275 // cur_client_id, Client->ClientID);
276 Threads_SetThread( Client->ClientID );
277 cur_client_id = Client->ClientID;
282 int callid = Client->CurrentRequest->CallID;
283 Log_Debug("AcessSrv", "Client %i request %i %s",
284 Client->ClientID, callid,
285 callid < N_SYSCALLS ? casSYSCALL_NAMES[callid] : "UNK"
290 retHeader = SyscallRecieve(Client->CurrentRequest, &retSize);
293 // Return an error to the client
294 printf("ERROR: SyscallRecieve failed\n");
295 errorHeader.CallID = Client->CurrentRequest->CallID;
296 errorHeader.NParams = 0;
297 retHeader = &errorHeader;
298 retSize = sizeof(errorHeader);
302 retHeader->ClientID = Client->ClientID;
304 // Mark the thread as ready for another job
305 free(Client->CurrentRequest);
306 Client->CurrentRequest = 0;
308 // Log_Debug("AcessSrv", "Sending %i to %x:%i (Client %i)",
309 // retSize, ntohl(Client->ClientAddr.sin_addr.s_addr),
310 // ntohs(Client->ClientAddr.sin_port),
315 sentSize = sendto(gSocket, retHeader, retSize, 0,
316 (struct sockaddr*)&Client->ClientAddr, sizeof(Client->ClientAddr)
318 if( sentSize != retSize ) {
319 perror("Server_WorkerThread - send");
322 // Free allocated header
323 if( retHeader != &errorHeader )
327 Log_Notice("Server", "Terminated Worker %p", ClientPtr);
331 int SyscallServer(void)
333 struct sockaddr_in server;
336 /* Open windows connection */
337 if (WSAStartup(0x0101, &gWinsock) != 0)
339 fprintf(stderr, "Could not open Windows connection.\n");
345 // Open TCP Connection
346 gSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
348 // Open UDP Connection
349 gSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
351 if (gSocket == INVALID_SOCKET)
353 fprintf(stderr, "Could not create socket.\n");
360 // Set server address
361 memset(&server, 0, sizeof(struct sockaddr_in));
362 server.sin_family = AF_INET;
363 server.sin_port = htons(SERVER_PORT);
364 server.sin_addr.s_addr = htonl(INADDR_ANY);
367 if( bind(gSocket, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1 )
369 fprintf(stderr, "Cannot bind address to socket.\n");
370 perror("SyscallServer - bind");
372 closesocket(gSocket);
384 Log_Notice("AcessSrv", "Listening on 0.0.0.0:%i", SERVER_PORT);
385 gpServer_ListenThread = SDL_CreateThread( Server_ListenThread, NULL );
389 int Server_Shutdown(void)
392 for( int i = 0; i < MAX_CLIENTS; i ++ )
394 if( gaServer_Clients[i].ClientID == 0 )
396 Threads_PostEvent( Threads_GetThread(gaServer_Clients[i].ClientID), 0 );
397 gaServer_Clients[i].ClientID = -1;
399 close(gaServer_Clients[i].Socket);
401 SDL_CondSignal(gaServer_Clients[i].WaitFlag);
407 int Server_ListenThread(void *Unused)
409 // Wait for something to do :)
413 struct sockaddr_in clientaddr;
414 socklen_t clientSize = sizeof(clientaddr);
415 int clientSock = accept(gSocket, (struct sockaddr*)&clientaddr, &clientSize);
416 if( clientSock < 0 ) {
417 perror("SyscallServer - accept");
421 char addrstr[4*8+8+1];
422 getnameinfo((struct sockaddr*)&clientaddr, sizeof(clientaddr),
423 addrstr, sizeof(addrstr), NULL, 0, NI_NUMERICHOST);
424 Log_Debug("Server", "Client connection %s:%i", addrstr, ntohs(clientaddr.sin_port));
428 tRequestAuthHdr authhdr;
429 len = recv(clientSock, (void*)&authhdr, sizeof(authhdr), 0);
430 if( len != sizeof(authhdr) ) {
431 // Some form of error?
432 Log_Warning("Server", "Client auth block bad size (%i != exp %i)",
433 len, sizeof(authhdr));
438 Log_Debug("Server", "Client assumed PID %i", authhdr.pid);
441 if( authhdr.pid == 0 ) {
442 // Allocate PID and client structure/thread
443 client = Server_GetClient(0);
444 client->Socket = clientSock;
445 authhdr.pid = client->ClientID;
448 // Get client structure and make sure it's unused
449 // - Auth token / verifcation?
450 client = Server_GetClient(authhdr.pid);
452 Log_Warning("Server", "Can't allocate a client struct for %s:%i",
453 addrstr, clientaddr.sin_port);
457 if( client->Socket != 0 ) {
458 Log_Warning("Server", "Client (%i)%p owned by FD%i but %s:%i tried to use it",
459 authhdr.pid, client, addrstr, clientaddr.sin_port);
464 client->Socket = clientSock;
467 Log_Debug("Server", "Client given PID %i - info %p", authhdr.pid, client);
469 len = send(clientSock, (void*)&authhdr, sizeof(authhdr), 0);
470 if( len != sizeof(authhdr) ) {
471 // Ok, this is an error
472 perror("Sending auth reply");
475 // All done, client thread should be watching now
479 tRequestHeader *req = (void*)data;
480 struct sockaddr_in addr;
481 uint clientSize = sizeof(addr);
485 length = recvfrom(gSocket, data, BUFSIZ, 0, (struct sockaddr*)&addr, &clientSize);
488 perror("SyscallServer - recv");
492 // Hand off to a worker thread
493 // - TODO: Actually have worker threads
494 // Log_Debug("Server", "%i bytes from %x:%i", length,
495 // ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
497 client = Server_GetClient(req->ClientID);
498 // NOTE: Hack - Should check if all zero
499 if( req->ClientID == 0 || client->ClientAddr.sin_port == 0 )
501 memcpy(&client->ClientAddr, &addr, sizeof(addr));
503 else if( memcmp(&client->ClientAddr, &addr, sizeof(addr)) != 0 )
505 printf("ClientID %i used by %x:%i\n",
506 client->ClientID, ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
507 printf(" actually owned by %x:%i\n",
508 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
512 if( client->CurrentRequest ) {
513 printf("Worker thread for %x:%i is busy\n",
514 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
518 // Log_Debug("AcessSrv", "Message from Client %i (%p)",
519 // client->ClientID, client);
521 // Make a copy of the request data
522 req = malloc(length);
523 memcpy(req, data, length);
524 client->CurrentRequest = req;
525 SDL_CondSignal(client->WaitFlag);