AcessNative/acesskernel_src/server.c

   1 /*
   2  * Acess2 Native Kernel
   3  * - Acess kernel emulation on another OS using SDL and UDP
   4  *
   5  * Syscall Server
   6  */
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <SDL/SDL.h>
  11 #ifdef __WIN32__
  12 # include <windows.h>
  13 # include <winsock.h>
  14 #else
  15 # include <unistd.h>
  16 # include <sys/socket.h>
  17 # include <netinet/in.h>
  18 #endif
  19 #include "../syscalls.h"
  20 //#include <debug.h>
  21
  22 #define USE_TCP 0
  23 #define MAX_CLIENTS     16
  24
  25 // === TYPES ===
  26 typedef struct {
  27          int    ClientID;
  28         SDL_Thread      *WorkerThread;
  29         #if USE_TCP
  30         #else
  31         tRequestHeader  *CurrentRequest;
  32         struct sockaddr_in      ClientAddr;
  33         SDL_cond        *WaitFlag;
  34         SDL_mutex       *Mutex;
  35         #endif
  36 }       tClient;
  37
  38 // === IMPORTS ===
  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, ...);
  45
  46 // === PROTOTYPES ===
  47 tClient *Server_GetClient(int ClientID);
  48  int    Server_WorkerThread(void *ClientPtr);
  49  int    SyscallServer(void);
  50  int    Server_ListenThread(void *Unused);
  51
  52 // === GLOBALS ===
  53 #ifdef __WIN32__
  54 WSADATA gWinsock;
  55 SOCKET  gSocket = INVALID_SOCKET;
  56 #else
  57 # define INVALID_SOCKET -1
  58  int    gSocket = INVALID_SOCKET;
  59 #endif
  60 tClient gaServer_Clients[MAX_CLIENTS];
  61 SDL_Thread      *gpServer_ListenThread;
  62
  63 // === CODE ===
  64 int Server_GetClientID(void)
  65 {
  66          int    i;
  67         Uint32  thisId = SDL_ThreadID();
  68
  69         for( i = 0; i < MAX_CLIENTS; i ++ )
  70         {
  71                 if( SDL_GetThreadID(gaServer_Clients[i].WorkerThread) == thisId )
  72                         return gaServer_Clients[i].ClientID;
  73         }
  74
  75         fprintf(stderr, "ERROR: Server_GetClientID - Thread is not allocated\n");
  76
  77         return 0;
  78 }
  79
  80 tClient *Server_GetClient(int ClientID)
  81 {
  82         tClient *ret = NULL;
  83          int    i;
  84
  85         // Allocate an ID if needed
  86         if(ClientID == 0)
  87                 ClientID = Threads_CreateRootProcess();
  88
  89         for( i = 0; i < MAX_CLIENTS; i ++ )
  90         {
  91                 if( gaServer_Clients[i].ClientID == ClientID ) {
  92                         return &gaServer_Clients[i];
  93                 }
  94                 if(!ret && gaServer_Clients[i].ClientID == 0)
  95                         ret = &gaServer_Clients[i];
  96         }
  97
  98         // Uh oh, no free slots
  99         // TODO: Dynamic allocation
 100         if( !ret )
 101                 return NULL;
 102
 103         // Allocate a thread for the process
 104         ret->ClientID = ClientID;
 105         ret->CurrentRequest = NULL;
 106
 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 );
 112         }
 113
 114         return ret;
 115 }
 116
 117 int Server_WorkerThread(void *ClientPtr)
 118 {
 119         tClient *Client = ClientPtr;
 120         tRequestHeader  *retHeader;
 121         tRequestHeader  errorHeader;
 122          int    retSize = 0;
 123          int    sentSize;
 124          int    cur_client_id = 0;
 125
 126         #if USE_TCP
 127         #else
 128         for( ;; )
 129         {
 130                 // Wait for something to do
 131                 while( Client->CurrentRequest == NULL )
 132                         SDL_CondWait(Client->WaitFlag, Client->Mutex);
 133
 134                 if(Client->ClientID != cur_client_id) {
 135                         Threads_SetThread( Client->ClientID );
 136                         cur_client_id = Client->ClientID;
 137                 }
 138
 139                 Log_Debug("AcessSrv", "Worker %i takes %p",
 140                         Client->ClientID, Client->CurrentRequest);
 141
 142                 // Get the response
 143                 retHeader = SyscallRecieve(Client->CurrentRequest, &retSize);
 144
 145                 if( !retHeader ) {
 146                         // Return an error to the client
 147                         printf("ERROR: SyscallRecieve failed\n");
 148                         errorHeader.CallID = Client->CurrentRequest->CallID;
 149                         errorHeader.NParams = 0;
 150                         retHeader = &errorHeader;
 151                         retSize = sizeof(errorHeader);
 152                 }
 153
 154                 // Set ID
 155                 retHeader->ClientID = Client->ClientID;
 156
 157                 // Mark the thread as ready for another job
 158                 Client->CurrentRequest = 0;
 159
 160                 Log_Debug("AcessSrv", "Sending %i to %x:%i (Client %i)",
 161                         retSize, ntohl(Client->ClientAddr.sin_addr.s_addr),
 162                         ntohs(Client->ClientAddr.sin_port),
 163                         Client->ClientID
 164                         );
 165
 166                 // Return the data
 167                 sentSize = sendto(gSocket, retHeader, retSize, 0,
 168                         (struct sockaddr*)&Client->ClientAddr, sizeof(Client->ClientAddr)
 169                         );
 170                 if( sentSize != retSize ) {
 171                         perror("Server_WorkerThread - send");
 172                 }
 173
 174                 // Free allocated header
 175                 if( retHeader != &errorHeader )
 176                         free( retHeader );
 177         }
 178         #endif
 179 }
 180
 181 int SyscallServer(void)
 182 {
 183         struct sockaddr_in      server;
 184
 185         #ifdef __WIN32__
 186         /* Open windows connection */
 187         if (WSAStartup(0x0101, &gWinsock) != 0)
 188         {
 189                 fprintf(stderr, "Could not open Windows connection.\n");
 190                 exit(0);
 191         }
 192         #endif
 193
 194         #if USE_TCP
 195         // Open TCP Connection
 196         gSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 197         #else
 198         // Open UDP Connection
 199         gSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 200         #endif
 201         if (gSocket == INVALID_SOCKET)
 202         {
 203                 fprintf(stderr, "Could not create socket.\n");
 204                 #if __WIN32__
 205                 WSACleanup();
 206                 #endif
 207                 exit(0);
 208         }
 209
 210         // Set server address
 211         memset(&server, 0, sizeof(struct sockaddr_in));
 212         server.sin_family = AF_INET;
 213         server.sin_port = htons(SERVER_PORT);
 214         server.sin_addr.s_addr = htonl(INADDR_ANY);
 215
 216         // Bind
 217         if( bind(gSocket, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1 )
 218         {
 219                 fprintf(stderr, "Cannot bind address to socket.\n");
 220                 perror("SyscallServer - bind");
 221                 #if __WIN32__
 222                 closesocket(gSocket);
 223                 WSACleanup();
 224                 #else
 225                 close(gSocket);
 226                 #endif
 227                 exit(0);
 228         }
 229
 230         #if USE_TCP
 231         listen(gSocket, 5);
 232         #endif
 233
 234         Log_Notice("AcessSrv", "Listening on 0.0.0.0:%i", SERVER_PORT);
 235         gpServer_ListenThread = SDL_CreateThread( Server_ListenThread, NULL );
 236         return 0;
 237 }
 238
 239 int Server_ListenThread(void *Unused)
 240 {
 241         // Wait for something to do :)
 242         for( ;; )
 243         {
 244                 #if USE_TCP
 245                 struct sockaddr_in      client;
 246                 uint    clientSize = sizeof(client);
 247                  int    clientSock = accept(gSocket, (struct sockaddr*)&client, &clientSize);
 248                 if( clientSock < 0 ) {
 249                         perror("SyscallServer - accept");
 250                         break ;
 251                 }
 252
 253                 Log("Client connection %x:%i\n",
 254                         ntohl(client.sin_addr), ntohs(client.sin_port)
 255                         );
 256
 257                 #else
 258                 char    data[BUFSIZ];
 259                 tRequestHeader  *req = (void*)data;
 260                 struct sockaddr_in      addr;
 261                 uint    clientSize = sizeof(addr);
 262                  int    length;
 263                 tClient *client;
 264
 265                 length = recvfrom(gSocket, data, BUFSIZ, 0, (struct sockaddr*)&addr, &clientSize);
 266
 267                 if( length == -1 ) {
 268                         perror("SyscallServer - recv");
 269                         break;
 270                 }
 271
 272                 // Hand off to a worker thread
 273                 // - TODO: Actually have worker threads
 274                 printf("%i bytes from %x:%i\n", length,
 275                         ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
 276
 277                 client = Server_GetClient(req->ClientID);
 278                 // NOTE: Hack - Should check if all zero
 279                 if( req->ClientID == 0 || client->ClientAddr.sin_port == 0 )
 280                 {
 281                         memcpy(&client->ClientAddr, &addr, sizeof(addr));
 282                 }
 283                 else if( memcmp(&client->ClientAddr, &addr, sizeof(addr)) != 0 )
 284                 {
 285                         printf("ClientID %i used by %x:%i\n",
 286                                 client->ClientID, ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
 287                         printf(" actually owned by %x:%i\n",
 288                                 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
 289                         continue;
 290                 }
 291
 292                 if( client->CurrentRequest ) {
 293                         printf("Worker thread for %x:%i is busy\n",
 294                                 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
 295                         continue;
 296                 }
 297
 298                 Log_Debug("AcessSrv", "Message from Client %i (%p)",
 299                         client->ClientID, client);
 300
 301                 client->CurrentRequest = req;
 302                 SDL_CondSignal(client->WaitFlag);
 303                 #endif
 304         }
 305         return -1;
 306 }