AcessNative - Now can use the `dir` CLIShell builtin
[tpg/acess2.git] / 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                 // Get the response
140                 retHeader = SyscallRecieve(Client->CurrentRequest, &retSize);
141
142                 Log_Debug("AcessSrv", "Client %i request %i",
143                         Client->ClientID, Client->CurrentRequest->CallID);
144                 
145                 
146                 if( !retHeader ) {
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);
153                 }
154                 
155                 // Set ID
156                 retHeader->ClientID = Client->ClientID;
157                 
158                 // Mark the thread as ready for another job
159                 Client->CurrentRequest = 0;
160                 
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),
164                         Client->ClientID
165                         );
166                 
167                 // Return the data
168                 sentSize = sendto(gSocket, retHeader, retSize, 0,
169                         (struct sockaddr*)&Client->ClientAddr, sizeof(Client->ClientAddr)
170                         );
171                 if( sentSize != retSize ) {
172                         perror("Server_WorkerThread - send");
173                 }
174                 
175                 // Free allocated header
176                 if( retHeader != &errorHeader )
177                         free( retHeader );
178         }
179         #endif
180 }
181
182 int SyscallServer(void)
183 {
184         struct sockaddr_in      server;
185         
186         #ifdef __WIN32__
187         /* Open windows connection */
188         if (WSAStartup(0x0101, &gWinsock) != 0)
189         {
190                 fprintf(stderr, "Could not open Windows connection.\n");
191                 exit(0);
192         }
193         #endif
194         
195         #if USE_TCP
196         // Open TCP Connection
197         gSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
198         #else
199         // Open UDP Connection
200         gSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
201         #endif
202         if (gSocket == INVALID_SOCKET)
203         {
204                 fprintf(stderr, "Could not create socket.\n");
205                 #if __WIN32__
206                 WSACleanup();
207                 #endif
208                 exit(0);
209         }
210         
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);
216         
217         // Bind
218         if( bind(gSocket, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1 )
219         {
220                 fprintf(stderr, "Cannot bind address to socket.\n");
221                 perror("SyscallServer - bind");
222                 #if __WIN32__
223                 closesocket(gSocket);
224                 WSACleanup();
225                 #else
226                 close(gSocket);
227                 #endif
228                 exit(0);
229         }
230         
231         #if USE_TCP
232         listen(gSocket, 5);
233         #endif
234         
235         Log_Notice("AcessSrv", "Listening on 0.0.0.0:%i", SERVER_PORT);
236         gpServer_ListenThread = SDL_CreateThread( Server_ListenThread, NULL );
237         return 0;
238 }
239
240 int Server_ListenThread(void *Unused)
241 {       
242         // Wait for something to do :)
243         for( ;; )
244         {
245                 #if USE_TCP
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");
251                         break ;
252                 }
253                 
254                 Log("Client connection %x:%i\n",
255                         ntohl(client.sin_addr), ntohs(client.sin_port)
256                         );
257                 
258                 #else
259                 char    data[BUFSIZ];
260                 tRequestHeader  *req = (void*)data;
261                 struct sockaddr_in      addr;
262                 uint    clientSize = sizeof(addr);
263                  int    length;
264                 tClient *client;
265                 
266                 length = recvfrom(gSocket, data, BUFSIZ, 0, (struct sockaddr*)&addr, &clientSize);
267                 
268                 if( length == -1 ) {
269                         perror("SyscallServer - recv");
270                         break;
271                 }
272                 
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));
277                 
278                 client = Server_GetClient(req->ClientID);
279                 // NOTE: Hack - Should check if all zero
280                 if( req->ClientID == 0 || client->ClientAddr.sin_port == 0 )
281                 {
282                         memcpy(&client->ClientAddr, &addr, sizeof(addr));
283                 }
284                 else if( memcmp(&client->ClientAddr, &addr, sizeof(addr)) != 0 )
285                 {
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));
290                         continue;
291                 }
292                 
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));
296                         continue;
297                 }
298                 
299                 Log_Debug("AcessSrv", "Message from Client %i (%p)",
300                         client->ClientID, client);
301                 
302                 client->CurrentRequest = req;
303                 SDL_CondSignal(client->WaitFlag);
304                 #endif
305         }
306         return -1;
307 }

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