Usermode/Applications/axwin3_src/WM/ipc.c

   1 /*
   2  * Acess2 GUI (AxWin) Version 3
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * ipc.c
   6  * - Interprocess communication
   7  */
   8 #include <common.h>
   9 #include <acess/sys.h>
  10 #include <net.h>
  11 #include <string.h>
  12 #include <ipcmessages.h>
  13 #include <stdio.h>
  14 #include <wm.h>
  15 #include <wm_internals.h>
  16 #include <wm_hotkeys.h>
  17
  18 #define AXWIN_PORT      4101
  19
  20 #define STATICBUF_SIZE  64
  21 #define MAX_WINDOWS_PER_APP     128
  22
  23 // === TYPES ===
  24 typedef struct sIPC_Type        tIPC_Type;
  25
  26 struct sIPC_Type
  27 {
  28          int    (*GetIdentSize)(const void *Ident);
  29          int    (*CompareIdent)(const void *Ident1, const void *Ident2);
  30         void    (*SendMessage)(const void *Ident, size_t Length, const void *Data);
  31 };
  32
  33 struct sIPC_Client
  34 {
  35         const tIPC_Type *IPCType;
  36         const void      *Ident; // Stored after structure
  37
  38          int    nWindows;
  39         tWindow **Windows;
  40 };
  41
  42 // === IMPORTS ===
  43 extern tWindow  *gpWM_FocusedWindow;    // Needed for _FocusWindow
  44
  45 // === PROTOTYPES ===
  46 void    IPC_Init(void);
  47 void    IPC_FillSelect(int *nfds, fd_set *set);
  48 void    IPC_HandleSelect(fd_set *set);
  49  int    IPC_Type_Datagram_GetSize(const void *Ident);
  50  int    IPC_Type_Datagram_Compare(const void *Ident1, const void *Ident2);
  51 void    IPC_Type_Datagram_Send(const void *Ident, size_t Length, const void *Data);
  52  int    IPC_Type_Sys_GetSize(const void *Ident);
  53  int    IPC_Type_Sys_Compare(const void *Ident1, const void *Ident2);
  54 void    IPC_Type_Sys_Send(const void *Ident, size_t Length, const void *Data);
  55 void    IPC_Handle(const tIPC_Type *IPCType, const void *Ident, size_t MsgLen, tAxWin_IPCMessage *Msg);
  56
  57 // === GLOBALS ===
  58 const tIPC_Type gIPC_Type_Datagram = {
  59         IPC_Type_Datagram_GetSize,
  60         IPC_Type_Datagram_Compare,
  61         IPC_Type_Datagram_Send
  62 };
  63 const tIPC_Type gIPC_Type_SysMessage = {
  64         IPC_Type_Sys_GetSize,
  65         IPC_Type_Sys_Compare,
  66         IPC_Type_Sys_Send
  67 };
  68  int    giNetworkFileHandle = -1;
  69  int    giMessagesFileHandle = -1;
  70  int    giIPC_ClientCount;
  71 tIPC_Client     **gIPC_Clients;
  72
  73 // === CODE ===
  74 void IPC_Init(void)
  75 {
  76          int    tmp;
  77         // TODO: Check this
  78         giNetworkFileHandle = open("/Devices/ip/loop/udp", OPENFLAG_READ);
  79         if( giNetworkFileHandle != -1 )
  80         {
  81                 tmp = AXWIN_PORT;
  82                 ioctl(giNetworkFileHandle, 4, &tmp);    // TODO: Don't hard-code IOCtl number
  83         }
  84 }
  85
  86 void IPC_FillSelect(int *nfds, fd_set *set)
  87 {
  88         if( giNetworkFileHandle != -1 )
  89         {
  90                 if( giNetworkFileHandle > *nfds )       *nfds = giNetworkFileHandle;
  91                 FD_SET(giNetworkFileHandle, set);
  92         }
  93 }
  94
  95 void IPC_HandleSelect(fd_set *set)
  96 {
  97         if( giNetworkFileHandle != -1 )
  98         {
  99                 if( FD_ISSET(giNetworkFileHandle, set) )
 100                 {
 101                         char    staticBuf[STATICBUF_SIZE];
 102                          int    readlen, identlen;
 103                         char    *msg;
 104
 105                         readlen = read(giNetworkFileHandle, staticBuf, sizeof(staticBuf));
 106
 107                         identlen = 4 + Net_GetAddressSize( ((uint16_t*)staticBuf)[1] );
 108                         msg = staticBuf + identlen;
 109
 110                         IPC_Handle(&gIPC_Type_Datagram, staticBuf, readlen - identlen, (void*)msg);
 111 //                      _SysDebug("IPC_HandleSelect: UDP handled");
 112                 }
 113         }
 114
 115         size_t  len;
 116         pid_t   tid;
 117         while( (len = SysGetMessage(&tid, 0, NULL)) )
 118         {
 119                 char    data[len];
 120                 SysGetMessage(NULL, len, data);
 121
 122                 IPC_Handle(&gIPC_Type_SysMessage, &tid, len, (void*)data);
 123 //              _SysDebug("IPC_HandleSelect: Message handled");
 124         }
 125 }
 126
 127 int IPC_Type_Datagram_GetSize(const void *Ident)
 128 {
 129         return 4 + Net_GetAddressSize( ((const uint16_t*)Ident)[1] );
 130 }
 131
 132 int IPC_Type_Datagram_Compare(const void *Ident1, const void *Ident2)
 133 {
 134         // Pass the buck :)
 135         // - No need to worry about mis-matching sizes, as the size is computed
 136         //   from the 3rd/4th bytes, hence it will differ before the size is hit.
 137         return memcmp(Ident1, Ident2, IPC_Type_Datagram_GetSize(Ident1));
 138 }
 139
 140 void IPC_Type_Datagram_Send(const void *Ident, size_t Length, const void *Data)
 141 {
 142          int    identlen = IPC_Type_Datagram_GetSize(Ident);
 143         char    tmpbuf[ identlen + Length ];
 144         memcpy(tmpbuf, Ident, identlen);        // Header
 145         memcpy(tmpbuf + identlen, Data, Length);        // Data
 146         // TODO: Handle fragmented packets
 147         write(giNetworkFileHandle, tmpbuf, sizeof(tmpbuf));
 148 }
 149
 150 int IPC_Type_Sys_GetSize(const void *Ident)
 151 {
 152         return sizeof(pid_t);
 153 }
 154
 155 int IPC_Type_Sys_Compare(const void *Ident1, const void *Ident2)
 156 {
 157         return *(const tid_t*)Ident1 - *(const tid_t*)Ident2;
 158 }
 159
 160 void IPC_Type_Sys_Send(const void *Ident, size_t Length, const void *Data)
 161 {
 162         SysSendMessage( *(const tid_t*)Ident, Length, Data );
 163 }
 164
 165 // --- Client -> Window Mappings
 166 int _CompareClientPtrs(const void *_a, const void *_b)
 167 {
 168         tIPC_Client     *a = *(tIPC_Client**)_a;
 169         tIPC_Client     *b = *(tIPC_Client**)_b;
 170
 171         if(a->IPCType < b->IPCType)     return -1;
 172         if(a->IPCType > b->IPCType)     return 1;
 173
 174         return a->IPCType->CompareIdent(a->Ident, b->Ident);
 175 }
 176
 177 tIPC_Client *IPC_int_GetClient(const tIPC_Type *IPCType, const void *Ident)
 178 {
 179          int    pos = 0;        // Position where the new client will be inserted
 180          int    ident_size;
 181         tIPC_Client     *ret;
 182
 183         // - Search list of registered clients
 184         if(giIPC_ClientCount > 0)
 185         {
 186                 tIPC_Client     target;
 187                  int    div;
 188                  int    cmp = -1;
 189
 190                 target.IPCType = IPCType;
 191                 target.Ident = Ident;
 192                 ret = &target;  // Abuse ret to get a pointer
 193
 194                 div = giIPC_ClientCount;
 195                 pos = div/2;
 196                 while(div > 0)
 197                 {
 198                         div /= 2;
 199                         cmp = _CompareClientPtrs(&ret, &gIPC_Clients[pos]);
 200 //                      _SysDebug("Checking against %i gives %i", pos, cmp);
 201                         if(cmp == 0)    break;
 202                         if(cmp < 0)
 203                                 pos -= div;
 204                         else
 205                                 pos += div;
 206                 }
 207
 208                 // - Return if found
 209                 if(cmp == 0)
 210                         return gIPC_Clients[pos];
 211
 212                 // Adjust pos to be the index where the new client will be placed
 213                 if(cmp > 0)     pos ++;
 214         }
 215
 216
 217         // - Create a new client entry
 218         ident_size = IPCType->GetIdentSize(Ident);
 219 //      _SysDebug("ident_size = %i", ident_size);
 220         ret = malloc( sizeof(tIPC_Client) + ident_size );
 221         if(!ret)        return NULL;
 222         ret->IPCType = IPCType;
 223         ret->Ident = ret + 1;   // Get the end of the structure
 224         memcpy( (void*)ret->Ident, Ident, ident_size );
 225         ret->nWindows = 0;
 226         ret->Windows = NULL;
 227
 228         // TODO: Register some way of detecting the client disconnecting
 229         //       > Wait on the thread / register with kernel somehow
 230         //       > Sockets are easier, but UDP is harder. Might get rid of it
 231
 232         // - Insert
 233         giIPC_ClientCount ++;
 234         gIPC_Clients = realloc(gIPC_Clients, giIPC_ClientCount*sizeof(tIPC_Client*));
 235         memmove(&gIPC_Clients[pos+1], &gIPC_Clients[pos], (giIPC_ClientCount-pos-1) * sizeof(tIPC_Client*));
 236         gIPC_Clients[pos] = ret;
 237
 238         return ret;
 239 }
 240
 241 tWindow *IPC_int_GetWindow(tIPC_Client *Client, uint32_t WindowID)
 242 {
 243         if( WindowID == -1 )
 244                 return NULL;
 245
 246         if( WindowID >= Client->nWindows ) {
 247                 return NULL;
 248         }
 249
 250         return Client->Windows[WindowID];
 251 }
 252
 253 void IPC_int_SetWindow(tIPC_Client *Client, uint32_t WindowID, tWindow *WindowPtr)
 254 {
 255         if( WindowID >= MAX_WINDOWS_PER_APP )
 256                 return ;
 257
 258         if( WindowID >= Client->nWindows )
 259         {
 260                  int    oldCount = Client->nWindows;
 261                 Client->nWindows = WindowID + 1;
 262                 Client->Windows = realloc(Client->Windows, Client->nWindows*sizeof(tWindow*));
 263                 memset( &Client->Windows[oldCount],  0, (Client->nWindows-oldCount)*sizeof(tWindow*) );
 264                 _SysDebug("Expanded %p's window list from %i to %i", Client, oldCount, Client->nWindows);
 265         }
 266
 267         _SysDebug("Assigned %p to window %i for %p", WindowPtr, WindowID, Client);
 268         Client->Windows[WindowID] = WindowPtr;
 269 }
 270
 271 // --- IPC Message Handlers ---
 272 int IPC_Msg_Ping(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 273 {
 274         ASSERT(Msg->ID == IPCMSG_PING);
 275
 276         if( !(Msg->Flags & IPCMSG_FLAG_RETURN) )        return 0;
 277
 278         if( Msg->Size < 4 )     return -1;
 279
 280         tIPCMsg_ReturnInt       *ret = (void*)Msg->Data;
 281         Msg->ID = IPCMSG_PING;
 282         Msg->Size = sizeof(*ret);
 283         ret->Value = AXWIN_VERSION;
 284         Client->IPCType->SendMessage(Client->Ident, sizeof(*Msg)+sizeof(*ret), Msg);
 285         return 0;
 286 }
 287
 288 int IPC_Msg_GetDisplayCount(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 289 {
 290         tAxWin_IPCMessage       *ret_hdr;
 291         tIPCMsg_ReturnInt       *ret;
 292         char    buf[sizeof(*ret_hdr)+sizeof(*ret)];
 293
 294         ASSERT(Msg->ID == IPCMSG_GETDISPLAYCOUNT);
 295
 296         if( !(Msg->Flags & IPCMSG_FLAG_RETURN) )        return 0;
 297
 298         ret_hdr = (void*)buf;
 299         ret_hdr->ID = IPCMSG_GETDISPLAYCOUNT;
 300         ret_hdr->Flags = 0;
 301         ret_hdr->Window = -1;
 302         ret_hdr->Size = sizeof(*ret);
 303         ret = (void*)ret_hdr->Data;
 304         ret->Value = 1; // HARD CODE - Current version only supports one display
 305
 306         Client->IPCType->SendMessage(Client->Ident, sizeof(buf), buf);
 307         return 0;
 308 }
 309
 310 int IPC_Msg_GetDisplayDims(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 311 {
 312         tIPCMsg_GetDisplayDims  *info;
 313         tAxWin_IPCMessage       *ret_hdr;
 314         tIPCMsg_RetDisplayDims  *ret;
 315         char    buf[sizeof(*ret_hdr)+sizeof(*ret)];
 316
 317         ASSERT(Msg->ID == IPCMSG_GETDISPLAYDIMS);
 318
 319         if( !(Msg->Flags & IPCMSG_FLAG_RETURN) )        return 0;
 320
 321         info = (void*)Msg->Data;
 322
 323         ret_hdr = (void*)buf;
 324         ret_hdr->ID = IPCMSG_GETDISPLAYDIMS;
 325         ret_hdr->Flags = 0;
 326         ret_hdr->Window = -1;
 327         ret_hdr->Size = sizeof(*ret);
 328         ret = (void*)ret_hdr->Data;
 329
 330         // HARD CODE! Only one display supported
 331         if( info->DisplayID == 0 )
 332         {
 333                 ret->X = 0;
 334                 ret->Y = 0;
 335                 ret->W = giScreenWidth;
 336                 ret->H = giScreenHeight;
 337         }
 338         else
 339         {
 340                 ret->X = 0;     ret->Y = 0;
 341                 ret->W = 0;     ret->H = 0;
 342         }
 343
 344         Client->IPCType->SendMessage(Client->Ident, sizeof(buf), buf);
 345         return 0;
 346 }
 347
 348 int IPC_Msg_SendMsg(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 349 {
 350         tIPCMsg_SendMsg *info = (void*)Msg->Data;
 351         tWindow *src, *dest;
 352
 353         ASSERT(Msg->ID == IPCMSG_SENDMSG);
 354
 355         // - Sanity checks
 356         if( Msg->Size < sizeof(tIPCMsg_SendMsg) )
 357                 return -1;
 358         if( Msg->Size < sizeof(tIPCMsg_SendMsg) + info->Length )
 359                 return -1;
 360
 361         src = IPC_int_GetWindow(Client, Msg->Window);
 362         if(!src)        return 1;
 363         dest = IPC_int_GetWindow(Client, info->Remote);
 364         if(!dest)       return 1;
 365
 366         WM_SendMessage(src, dest, info->ID, info->Length, info->Data);
 367
 368         return 0;
 369 }
 370
 371 int IPC_Msg_CreateWin(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 372 {
 373         tIPCMsg_CreateWin       *info = (void*)Msg->Data;
 374         tWindow *newwin, *parent;
 375
 376         ASSERT(Msg->ID == IPCMSG_CREATEWIN);
 377
 378         // - Sanity checks
 379         //  > +1 is for NULL byte on string
 380         if( Msg->Size < sizeof(*info) + 1 ) {
 381                 _SysDebug("IPC_Msg_CreateWin: Size check 1 failed");
 382                 return -1;
 383         }
 384         if( info->Renderer[Msg->Size - sizeof(*info) - 1] != '\0' ) {
 385                 _SysDebug("IPC_Msg_CreateWin: Size check 2 failed");
 386                 _SysDebug("info = {");
 387                 _SysDebug("  .NewWinID = %i", info->NewWinID);
 388                 _SysDebug("  .RendererArg = %i", info->RendererArg);
 389                 _SysDebug("  .Renderer = '%.*s'", Msg->Size - sizeof(*info), info->Renderer);
 390                 _SysDebug("}");
 391                 return -1;
 392         }
 393
 394         // - Get the parent window ID
 395         parent = IPC_int_GetWindow(Client, Msg->Window);
 396
 397         // Catch creating a window with an existing ID
 398         if( IPC_int_GetWindow(Client, info->NewWinID) )
 399                 return 1;
 400
 401         // - Create the new window, and save its pointer
 402         newwin = WM_CreateWindow(parent, Client, info->NewWinID, info->RendererArg, info->Renderer);
 403         IPC_int_SetWindow(Client, info->NewWinID, newwin);
 404
 405         return 0;
 406 }
 407
 408 int IPC_Msg_SetWindowTitle(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 409 {
 410         tWindow *win;
 411
 412         ASSERT(Msg->ID == IPCMSG_SETWINTITLE);
 413
 414         if( Msg->Size < 1 )     return -1;
 415         if( Msg->Data[ Msg->Size-1 ] != '\0' )  return -1;
 416
 417         win = IPC_int_GetWindow(Client, Msg->Window);
 418         if(!win)        return 1;
 419
 420         WM_SetWindowTitle(win, Msg->Data);
 421
 422         return 0;
 423 }
 424
 425 int IPC_Msg_ShowWindow(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 426 {
 427         tIPCMsg_Boolean *info = (void*)Msg->Data;
 428         tWindow *win;
 429
 430         ASSERT(Msg->ID == IPCMSG_SHOWWINDOW);
 431
 432         if( Msg->Size < sizeof(*info) ) return -1;
 433
 434         win = IPC_int_GetWindow(Client, Msg->Window);
 435         if(!win)        return 1;
 436
 437         WM_ShowWindow(win, !!info->Value);
 438
 439         return 0;
 440 }
 441
 442 int IPC_Msg_DecorateWindow(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 443 {
 444         tIPCMsg_Boolean *info = (void*)Msg->Data;
 445         tWindow *win;
 446
 447         if( Msg->Size < sizeof(*info) ) return -1;
 448
 449         win = IPC_int_GetWindow(Client, Msg->Window);
 450         if(!win)        return 1;
 451
 452         WM_DecorateWindow(win, !!info->Value);
 453         return 0;
 454 }
 455
 456 int IPC_Msg_FocusWindow(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 457 {
 458         tWindow *win;
 459
 460         ASSERT(Msg->ID == IPCMSG_FOCUSWINDOW);
 461
 462         // Don't allow the focus to be changed unless the client has the focus
 463         if(!gpWM_FocusedWindow) return 1;
 464         if(gpWM_FocusedWindow->Client != Client)        return 1;
 465
 466         win = IPC_int_GetWindow(Client, Msg->Window);
 467         if(!win)        return 1;
 468
 469         WM_FocusWindow(win);
 470
 471         return 0;
 472 }
 473
 474 int IPC_Msg_SetWinPos(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 475 {
 476         tIPCMsg_SetWindowPos    *info = (void*)Msg->Data;
 477         tWindow *win;
 478
 479         ASSERT(Msg->ID == IPCMSG_SETWINPOS);
 480
 481         if(Msg->Size < sizeof(*info))   return -1;
 482
 483         win = IPC_int_GetWindow(Client, Msg->Window);
 484         if(!win)        return 1;
 485
 486         _SysDebug("info = {..., bSetPos=%i,bSetDims=%i}", info->bSetPos, info->bSetDims);
 487
 488         if(info->bSetPos)
 489                 WM_MoveWindow(win, info->X, info->Y);
 490         if(info->bSetDims)
 491                 WM_ResizeWindow(win, info->W, info->H);
 492
 493         return 0;
 494 }
 495
 496 int IPC_Msg_RegisterAction(tIPC_Client *Client, tAxWin_IPCMessage *Msg)
 497 {
 498         tIPCMsg_RegAction       *info = (void*)Msg->Data;
 499         tWindow *win;
 500
 501         ASSERT(Msg->ID == IPCMSG_REGACTION);
 502
 503         if( Msg->Size < sizeof(*info) + 1 )
 504                 return -1;
 505
 506         win = IPC_int_GetWindow(Client, Msg->Window);
 507         if(!win)        return 1;
 508
 509         if( strnlen(info->Action, Msg->Size - sizeof(*info)) == Msg->Size - sizeof(*info) )
 510                 return 1;
 511
 512         _SysDebug("RegisterAction %p:%i [%i]\"%s\"",
 513                 Client, Msg->Window, info->Index, info->Action
 514                 );
 515
 516         WM_Hotkey_RegisterAction(info->Action, win, info->Index);
 517
 518         return 0;
 519 }
 520
 521 int (*gIPC_MessageHandlers[])(tIPC_Client *Client, tAxWin_IPCMessage *Msg) = {
 522         IPC_Msg_Ping,
 523         IPC_Msg_GetDisplayCount,
 524         IPC_Msg_GetDisplayDims,
 525         IPC_Msg_SendMsg,
 526         IPC_Msg_CreateWin,
 527         NULL,   // Destroy window
 528         IPC_Msg_SetWindowTitle,
 529         IPC_Msg_ShowWindow,
 530         IPC_Msg_DecorateWindow,
 531         IPC_Msg_FocusWindow,
 532         IPC_Msg_SetWinPos,
 533         IPC_Msg_RegisterAction
 534 };
 535 const int giIPC_NumMessageHandlers = sizeof(gIPC_MessageHandlers)/sizeof(gIPC_MessageHandlers[0]);
 536
 537 void IPC_Handle(const tIPC_Type *IPCType, const void *Ident, size_t MsgLen, tAxWin_IPCMessage *Msg)
 538 {
 539         tIPC_Client     *client;
 540          int    rv = 0;
 541
 542         _SysDebug("IPC_Handle: (IPCType=%p, Ident=%p, MsgLen=%i, Msg=%p)",
 543                 IPCType, Ident, MsgLen, Msg);
 544
 545         if( MsgLen < sizeof(tAxWin_IPCMessage) )
 546                 return ;
 547         if( MsgLen < sizeof(tAxWin_IPCMessage) + Msg->Size )
 548                 return ;
 549
 550         client = IPC_int_GetClient(IPCType, Ident);
 551
 552         if( Msg->ID >= giIPC_NumMessageHandlers ) {
 553                 fprintf(stderr, "WARNING: Unknown message %i (%p)\n", Msg->ID, IPCType);
 554                 _SysDebug("WARNING: Unknown message %i (%p)", Msg->ID, IPCType);
 555                 return ;
 556         }
 557
 558         if( !gIPC_MessageHandlers[ Msg->ID ] ) {
 559                 fprintf(stderr, "WARNING: Message %i does not have a handler\n", Msg->ID);
 560                 _SysDebug("WARNING: Message %i does not have a handler", Msg->ID);
 561                 return ;
 562         }
 563
 564         _SysDebug("IPC_Handle: Msg->ID = %i", Msg->ID);
 565         rv = gIPC_MessageHandlers[Msg->ID](client, Msg);
 566         _SysDebug("IPC_Handle: rv = %i", rv);
 567 }
 568
 569 // --- Server->Client replies
 570 void IPC_SendWMMessage(tIPC_Client *Client, uint32_t Src, uint32_t Dst, int MsgID, int Len, void *Data)
 571 {
 572         tAxWin_IPCMessage       *hdr;
 573         tIPCMsg_SendMsg         *msg;
 574         char    buf[sizeof(*hdr)+sizeof(*msg)+Len];
 575
 576         hdr = (void*)buf;
 577         msg = (void*)hdr->Data;
 578
 579         hdr->ID = IPCMSG_SENDMSG;
 580         hdr->Flags = 0;
 581         hdr->Size = sizeof(*msg) + Len;
 582         hdr->Window = Dst;
 583
 584         msg->Remote = Src;
 585         msg->ID = MsgID;
 586         msg->Length = Len;
 587         memcpy(msg->Data, Data, Len);
 588
 589         Client->IPCType->SendMessage(Client->Ident, sizeof(buf), buf);
 590 }
 591