dll/win32/dhcpcsvc/dhcp/adapter.c

   1 #include "rosdhcp.h"
   2
   3 SOCKET DhcpSocket = INVALID_SOCKET;
   4 static LIST_ENTRY AdapterList;
   5 static WSADATA wsd;
   6
   7 PCHAR *GetSubkeyNames( PCHAR MainKeyName, PCHAR Append ) {
   8     int i = 0;
   9     DWORD Error;
  10     HKEY MainKey;
  11     PCHAR *Out, OutKeyName;
  12     DWORD CharTotal = 0, AppendLen = 1 + strlen(Append);
  13     DWORD MaxSubKeyLen = 0, MaxSubKeys = 0;
  14
  15     Error = RegOpenKey( HKEY_LOCAL_MACHINE, MainKeyName, &MainKey );
  16
  17     if( Error ) return NULL;
  18
  19     Error = RegQueryInfoKey
  20         ( MainKey,
  21           NULL, NULL, NULL,
  22           &MaxSubKeys, &MaxSubKeyLen,
  23           NULL, NULL, NULL, NULL, NULL, NULL );
  24
  25     DH_DbgPrint(MID_TRACE,("MaxSubKeys: %d, MaxSubKeyLen %d\n",
  26                            MaxSubKeys, MaxSubKeyLen));
  27
  28     CharTotal = (sizeof(PCHAR) + MaxSubKeyLen + AppendLen) * (MaxSubKeys + 1);
  29
  30     DH_DbgPrint(MID_TRACE,("AppendLen: %d, CharTotal: %d\n",
  31                            AppendLen, CharTotal));
  32
  33     Out = (CHAR**) malloc( CharTotal );
  34     OutKeyName = ((PCHAR)&Out[MaxSubKeys+1]);
  35
  36     if( !Out ) { RegCloseKey( MainKey ); return NULL; }
  37
  38     i = 0;
  39     do {
  40         Out[i] = OutKeyName;
  41         Error = RegEnumKey( MainKey, i, OutKeyName, MaxSubKeyLen );
  42         if( !Error ) {
  43             strcat( OutKeyName, Append );
  44             DH_DbgPrint(MID_TRACE,("[%d]: %s\n", i, OutKeyName));
  45             OutKeyName += strlen(OutKeyName) + 1;
  46             i++;
  47         } else Out[i] = 0;
  48     } while( Error == ERROR_SUCCESS );
  49
  50     RegCloseKey( MainKey );
  51
  52     return Out;
  53 }
  54
  55 PCHAR RegReadString( HKEY Root, PCHAR Subkey, PCHAR Value ) {
  56     PCHAR SubOut = NULL;
  57     DWORD SubOutLen = 0, Error = 0;
  58     HKEY  ValueKey = NULL;
  59
  60     DH_DbgPrint(MID_TRACE,("Looking in %x:%s:%s\n", Root, Subkey, Value ));
  61
  62     if( Subkey && strlen(Subkey) ) {
  63         if( RegOpenKey( Root, Subkey, &ValueKey ) != ERROR_SUCCESS )
  64             goto regerror;
  65     } else ValueKey = Root;
  66
  67     DH_DbgPrint(MID_TRACE,("Got Key %x\n", ValueKey));
  68
  69     if( (Error = RegQueryValueEx( ValueKey, Value, NULL, NULL,
  70                                   (LPBYTE)SubOut, &SubOutLen )) != ERROR_SUCCESS )
  71         goto regerror;
  72
  73     DH_DbgPrint(MID_TRACE,("Value %s has size %d\n", Value, SubOutLen));
  74
  75     if( !(SubOut = (CHAR*) malloc(SubOutLen)) )
  76         goto regerror;
  77
  78     if( (Error = RegQueryValueEx( ValueKey, Value, NULL, NULL,
  79                                   (LPBYTE)SubOut, &SubOutLen )) != ERROR_SUCCESS )
  80         goto regerror;
  81
  82     DH_DbgPrint(MID_TRACE,("Value %s is %s\n", Value, SubOut));
  83
  84     goto cleanup;
  85
  86 regerror:
  87     if( SubOut ) { free( SubOut ); SubOut = NULL; }
  88 cleanup:
  89     if( ValueKey && ValueKey != Root ) {
  90         DH_DbgPrint(MID_TRACE,("Closing key %x\n", ValueKey));
  91         RegCloseKey( ValueKey );
  92     }
  93
  94     DH_DbgPrint(MID_TRACE,("Returning %x with error %d\n", SubOut, Error));
  95
  96     return SubOut;
  97 }
  98
  99 HKEY FindAdapterKey( PDHCP_ADAPTER Adapter ) {
 100     int i = 0;
 101     PCHAR EnumKeyName =
 102         "SYSTEM\\CurrentControlSet\\Control\\Class\\"
 103         "{4D36E972-E325-11CE-BFC1-08002BE10318}";
 104     PCHAR TargetKeyNameStart =
 105         "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\";
 106     PCHAR TargetKeyName = NULL;
 107     PCHAR *EnumKeysLinkage = GetSubkeyNames( EnumKeyName, "\\Linkage" );
 108     PCHAR *EnumKeysTop     = GetSubkeyNames( EnumKeyName, "" );
 109     PCHAR RootDevice = NULL;
 110     HKEY EnumKey, OutKey = NULL;
 111     DWORD Error = ERROR_SUCCESS;
 112
 113     if( !EnumKeysLinkage || !EnumKeysTop ) goto cleanup;
 114
 115     Error = RegOpenKey( HKEY_LOCAL_MACHINE, EnumKeyName, &EnumKey );
 116
 117     if( Error ) goto cleanup;
 118
 119     for( i = 0; EnumKeysLinkage[i]; i++ ) {
 120         RootDevice = RegReadString
 121             ( EnumKey, EnumKeysLinkage[i], "RootDevice" );
 122
 123         if( RootDevice &&
 124             !strcmp( RootDevice, Adapter->DhclientInfo.name ) ) {
 125             TargetKeyName =
 126                 (CHAR*) malloc( strlen( TargetKeyNameStart ) +
 127                         strlen( RootDevice ) + 1);
 128             if( !TargetKeyName ) goto cleanup;
 129             sprintf( TargetKeyName, "%s%s",
 130                      TargetKeyNameStart, RootDevice );
 131             Error = RegCreateKeyExA( HKEY_LOCAL_MACHINE, TargetKeyName, 0, NULL, 0, KEY_READ, NULL, &OutKey, NULL );
 132             break;
 133         } else {
 134             free( RootDevice ); RootDevice = 0;
 135         }
 136     }
 137
 138 cleanup:
 139     if( RootDevice ) free( RootDevice );
 140     if( EnumKeysLinkage ) free( EnumKeysLinkage );
 141     if( EnumKeysTop ) free( EnumKeysTop );
 142     if( TargetKeyName ) free( TargetKeyName );
 143
 144     return OutKey;
 145 }
 146
 147 BOOL PrepareAdapterForService( PDHCP_ADAPTER Adapter ) {
 148     HKEY AdapterKey;
 149     DWORD Error = ERROR_SUCCESS, DhcpEnabled, Length = sizeof(DWORD);
 150
 151     Adapter->DhclientState.config = &Adapter->DhclientConfig;
 152     strncpy(Adapter->DhclientInfo.name, (char*)Adapter->IfMib.bDescr,
 153             sizeof(Adapter->DhclientInfo.name));
 154
 155     AdapterKey = FindAdapterKey( Adapter );
 156     if( AdapterKey )
 157     {
 158         Error = RegQueryValueEx(AdapterKey, "EnableDHCP", NULL, NULL, (LPBYTE)&DhcpEnabled, &Length);
 159
 160         if (Error != ERROR_SUCCESS || Length != sizeof(DWORD))
 161             DhcpEnabled = 1;
 162
 163         CloseHandle(AdapterKey);
 164     }
 165     else
 166     {
 167         /* DHCP enabled by default */
 168         DhcpEnabled = 1;
 169     }
 170
 171     if( !DhcpEnabled ) {
 172         /* Non-automatic case */
 173         DbgPrint("DHCPCSVC: Adapter Name: [%s] (static)\n", Adapter->DhclientInfo.name);
 174
 175         Adapter->DhclientState.state = S_STATIC;
 176     } else {
 177         /* Automatic case */
 178         DbgPrint("DHCPCSVC: Adapter Name: [%s] (dynamic)\n", Adapter->DhclientInfo.name);
 179
 180         Adapter->DhclientInfo.client->state = S_INIT;
 181     }
 182
 183     return TRUE;
 184 }
 185
 186 void AdapterInit() {
 187     WSAStartup(0x0101,&wsd);
 188
 189     InitializeListHead( &AdapterList );
 190 }
 191
 192 int
 193 InterfaceConnected(const MIB_IFROW* IfEntry)
 194 {
 195     if (IfEntry->dwOperStatus == IF_OPER_STATUS_CONNECTED ||
 196         IfEntry->dwOperStatus == IF_OPER_STATUS_OPERATIONAL)
 197         return 1;
 198
 199     DH_DbgPrint(MID_TRACE,("Interface %d is down\n", IfEntry->dwIndex));
 200     return 0;
 201 }
 202
 203 /*
 204  * XXX Figure out the way to bind a specific adapter to a socket.
 205  */
 206 DWORD WINAPI AdapterDiscoveryThread(LPVOID Context) {
 207     PMIB_IFTABLE Table = (PMIB_IFTABLE) malloc(sizeof(MIB_IFTABLE));
 208     DWORD Error, Size = sizeof(MIB_IFTABLE);
 209     PDHCP_ADAPTER Adapter = NULL;
 210     HANDLE AdapterStateChangedEvent = (HANDLE)Context;
 211     struct interface_info *ifi = NULL;
 212     struct protocol *proto;
 213     int i, AdapterCount = 0, Broadcast;
 214
 215     /* FIXME: Kill this thread when the service is stopped */
 216
 217     do {
 218        DH_DbgPrint(MID_TRACE,("Getting Adapter List...\n"));
 219
 220        while( (Error = GetIfTable(Table, &Size, 0 )) ==
 221                ERROR_INSUFFICIENT_BUFFER ) {
 222            DH_DbgPrint(MID_TRACE,("Error %d, New Buffer Size: %d\n", Error, Size));
 223            free( Table );
 224            Table = (PMIB_IFTABLE) malloc( Size );
 225        }
 226
 227        if( Error != NO_ERROR )
 228        {
 229            /* HACK: We are waiting until TCP/IP starts */
 230            Sleep(2000);
 231            continue;
 232        }
 233
 234        DH_DbgPrint(MID_TRACE,("Got Adapter List (%d entries)\n", Table->dwNumEntries));
 235
 236        for( i = Table->dwNumEntries - 1; i >= 0; i-- ) {
 237             DH_DbgPrint(MID_TRACE,("Getting adapter %d attributes\n",
 238                                    Table->table[i].dwIndex));
 239
 240             ApiLock();
 241
 242             if ((Adapter = AdapterFindByHardwareAddress(Table->table[i].bPhysAddr, Table->table[i].dwPhysAddrLen)))
 243             {
 244                 /* This is an existing adapter */
 245                 if (InterfaceConnected(&Table->table[i])) {
 246                     /* We're still active so we stay in the list */
 247                     ifi = &Adapter->DhclientInfo;
 248                 } else {
 249                     proto = find_protocol_by_adapter(&Adapter->DhclientInfo);
 250                     if (proto)
 251                         remove_protocol(proto);
 252
 253                     /* We've lost our link so out we go */
 254                     RemoveEntryList(&Adapter->ListEntry);
 255                     free(Adapter);
 256                 }
 257
 258                 ApiUnlock();
 259
 260                 continue;
 261             }
 262
 263             ApiUnlock();
 264
 265             Adapter = (DHCP_ADAPTER*) calloc( sizeof( DHCP_ADAPTER ) + Table->table[i].dwMtu, 1 );
 266
 267             if( Adapter && Table->table[i].dwType == MIB_IF_TYPE_ETHERNET && InterfaceConnected(&Table->table[i])) {
 268                 memcpy( &Adapter->IfMib, &Table->table[i],
 269                         sizeof(Adapter->IfMib) );
 270                 Adapter->DhclientInfo.client = &Adapter->DhclientState;
 271                 Adapter->DhclientInfo.rbuf = Adapter->recv_buf;
 272                 Adapter->DhclientInfo.rbuf_max = Table->table[i].dwMtu;
 273                 Adapter->DhclientInfo.rbuf_len =
 274                     Adapter->DhclientInfo.rbuf_offset = 0;
 275                 memcpy(Adapter->DhclientInfo.hw_address.haddr,
 276                        Adapter->IfMib.bPhysAddr,
 277                        Adapter->IfMib.dwPhysAddrLen);
 278                 Adapter->DhclientInfo.hw_address.hlen = Adapter->IfMib.dwPhysAddrLen;
 279
 280                 /* I'm not sure where else to set this, but
 281                    some DHCP servers won't take a zero.
 282                    We checked the hardware type earlier in
 283                    the if statement. */
 284                 Adapter->DhclientInfo.hw_address.htype = HTYPE_ETHER;
 285
 286                 if( DhcpSocket == INVALID_SOCKET ) {
 287                     DhcpSocket =
 288                         Adapter->DhclientInfo.rfdesc =
 289                         Adapter->DhclientInfo.wfdesc =
 290                         socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
 291
 292                     if (DhcpSocket != INVALID_SOCKET) {
 293
 294                                                 /* Allow broadcast on this socket */
 295                                                 Broadcast = 1;
 296                                                 setsockopt(DhcpSocket,
 297                                                                    SOL_SOCKET,
 298                                                                    SO_BROADCAST,
 299                                                                    (const char *)&Broadcast,
 300                                                                    sizeof(Broadcast));
 301
 302                         Adapter->ListenAddr.sin_family = AF_INET;
 303                         Adapter->ListenAddr.sin_port = htons(LOCAL_PORT);
 304                         Adapter->BindStatus =
 305                              (bind( Adapter->DhclientInfo.rfdesc,
 306                                     (struct sockaddr *)&Adapter->ListenAddr,
 307                                     sizeof(Adapter->ListenAddr) ) == 0) ?
 308                              0 : WSAGetLastError();
 309                     } else {
 310                         error("socket() failed: %d\n", WSAGetLastError());
 311                     }
 312                 } else {
 313                     Adapter->DhclientInfo.rfdesc =
 314                         Adapter->DhclientInfo.wfdesc = DhcpSocket;
 315                 }
 316
 317                 Adapter->DhclientConfig.timeout = DHCP_PANIC_TIMEOUT;
 318                 Adapter->DhclientConfig.initial_interval = DHCP_DISCOVER_INTERVAL;
 319                 Adapter->DhclientConfig.retry_interval = DHCP_DISCOVER_INTERVAL;
 320                 Adapter->DhclientConfig.select_interval = 1;
 321                 Adapter->DhclientConfig.reboot_timeout = DHCP_REBOOT_TIMEOUT;
 322                 Adapter->DhclientConfig.backoff_cutoff = DHCP_BACKOFF_MAX;
 323                 Adapter->DhclientState.interval =
 324                     Adapter->DhclientConfig.retry_interval;
 325
 326                 if( PrepareAdapterForService( Adapter ) ) {
 327                     Adapter->DhclientInfo.next = ifi;
 328                     ifi = &Adapter->DhclientInfo;
 329
 330                     read_client_conf(&Adapter->DhclientInfo);
 331
 332                     if (Adapter->DhclientInfo.client->state == S_INIT)
 333                     {
 334                         add_protocol(Adapter->DhclientInfo.name,
 335                                      Adapter->DhclientInfo.rfdesc,
 336                                      got_one, &Adapter->DhclientInfo);
 337
 338                         state_init(&Adapter->DhclientInfo);
 339                     }
 340
 341                     ApiLock();
 342                     InsertTailList( &AdapterList, &Adapter->ListEntry );
 343                     AdapterCount++;
 344                     SetEvent(AdapterStateChangedEvent);
 345                     ApiUnlock();
 346                 } else { free( Adapter ); Adapter = 0; }
 347             } else { free( Adapter ); Adapter = 0; }
 348
 349             if( !Adapter )
 350                 DH_DbgPrint(MID_TRACE,("Adapter %d was rejected\n",
 351                                        Table->table[i].dwIndex));
 352         }
 353 #if 0
 354         Error = NotifyAddrChange(NULL, NULL);
 355         if (Error != NO_ERROR)
 356             break;
 357 #else
 358         Sleep(3000);
 359 #endif
 360     } while (TRUE);
 361
 362     DbgPrint("DHCPCSVC: Adapter discovery thread is terminating! (Error: %d)\n", Error);
 363
 364     if( Table ) free( Table );
 365     return Error;
 366 }
 367
 368 HANDLE StartAdapterDiscovery(VOID) {
 369     HANDLE ThreadHandle, EventHandle;
 370
 371     EventHandle = CreateEvent(NULL,
 372                               FALSE,
 373                               FALSE,
 374                               NULL);
 375
 376     ThreadHandle = CreateThread(NULL,
 377                                 0,
 378                                 AdapterDiscoveryThread,
 379                                 (LPVOID)EventHandle,
 380                                 0,
 381                                 NULL);
 382
 383     if (ThreadHandle == NULL)
 384         return NULL;
 385
 386     CloseHandle(ThreadHandle);
 387
 388     return EventHandle;
 389 }
 390
 391 void AdapterStop() {
 392     PLIST_ENTRY ListEntry;
 393     PDHCP_ADAPTER Adapter;
 394     ApiLock();
 395     while( !IsListEmpty( &AdapterList ) ) {
 396         ListEntry = (PLIST_ENTRY)RemoveHeadList( &AdapterList );
 397         Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 398         free( Adapter );
 399     }
 400     ApiUnlock();
 401     WSACleanup();
 402 }
 403
 404 PDHCP_ADAPTER AdapterFindIndex( unsigned int indx ) {
 405     PDHCP_ADAPTER Adapter;
 406     PLIST_ENTRY ListEntry;
 407
 408     for( ListEntry = AdapterList.Flink;
 409          ListEntry != &AdapterList;
 410          ListEntry = ListEntry->Flink ) {
 411         Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 412         if( Adapter->IfMib.dwIndex == indx ) return Adapter;
 413     }
 414
 415     return NULL;
 416 }
 417
 418 PDHCP_ADAPTER AdapterFindName( const WCHAR *name ) {
 419     PDHCP_ADAPTER Adapter;
 420     PLIST_ENTRY ListEntry;
 421
 422     for( ListEntry = AdapterList.Flink;
 423          ListEntry != &AdapterList;
 424          ListEntry = ListEntry->Flink ) {
 425         Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 426         if( !wcsicmp( Adapter->IfMib.wszName, name ) ) return Adapter;
 427     }
 428
 429     return NULL;
 430 }
 431
 432 PDHCP_ADAPTER AdapterFindInfo( struct interface_info *ip ) {
 433     PDHCP_ADAPTER Adapter;
 434     PLIST_ENTRY ListEntry;
 435
 436     for( ListEntry = AdapterList.Flink;
 437          ListEntry != &AdapterList;
 438          ListEntry = ListEntry->Flink ) {
 439         Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 440         if( ip == &Adapter->DhclientInfo ) return Adapter;
 441     }
 442
 443     return NULL;
 444 }
 445
 446 PDHCP_ADAPTER AdapterFindByHardwareAddress( u_int8_t haddr[16], u_int8_t hlen ) {
 447     PDHCP_ADAPTER Adapter;
 448     PLIST_ENTRY ListEntry;
 449
 450     for(ListEntry = AdapterList.Flink;
 451         ListEntry != &AdapterList;
 452         ListEntry = ListEntry->Flink) {
 453        Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 454        if (Adapter->DhclientInfo.hw_address.hlen == hlen &&
 455            !memcmp(Adapter->DhclientInfo.hw_address.haddr,
 456                   haddr,
 457                   hlen)) return Adapter;
 458     }
 459
 460     return NULL;
 461 }
 462
 463 PDHCP_ADAPTER AdapterGetFirst() {
 464     if( IsListEmpty( &AdapterList ) ) return NULL; else {
 465         return CONTAINING_RECORD
 466             ( AdapterList.Flink, DHCP_ADAPTER, ListEntry );
 467     }
 468 }
 469
 470 PDHCP_ADAPTER AdapterGetNext( PDHCP_ADAPTER This )
 471 {
 472     if( This->ListEntry.Flink == &AdapterList ) return NULL;
 473     return CONTAINING_RECORD
 474         ( This->ListEntry.Flink, DHCP_ADAPTER, ListEntry );
 475 }
 476
 477 void if_register_send(struct interface_info *ip) {
 478
 479 }
 480
 481 void if_register_receive(struct interface_info *ip) {
 482 }