dll/win32/dhcpcsvc/dhcp/adapter.c

   1 #include "rosdhcp.h"
   2
   3 static 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 = NULL;
 149     PCHAR IPAddress = NULL, Netmask = NULL, DefaultGateway = NULL;
 150     NTSTATUS Status = STATUS_SUCCESS;
 151     DWORD Error = ERROR_SUCCESS;
 152
 153     Adapter->DhclientState.config = &Adapter->DhclientConfig;
 154     strncpy(Adapter->DhclientInfo.name, (char*)Adapter->IfMib.bDescr,
 155             sizeof(Adapter->DhclientInfo.name));
 156
 157     AdapterKey = FindAdapterKey( Adapter );
 158     if( AdapterKey )
 159         IPAddress = RegReadString( AdapterKey, NULL, "IPAddress" );
 160
 161     if( IPAddress && strcmp( IPAddress, "0.0.0.0" ) ) {
 162         /* Non-automatic case */
 163         DH_DbgPrint
 164             (MID_TRACE,("Adapter Name: [%s] (Bind Status %x) (static %s)\n",
 165                         Adapter->DhclientInfo.name,
 166                         Adapter->BindStatus,
 167                         IPAddress));
 168
 169         Adapter->DhclientState.state = S_STATIC;
 170
 171         Netmask = RegReadString( AdapterKey, NULL, "Subnetmask" );
 172
 173         Status = AddIPAddress( inet_addr( IPAddress ),
 174                                inet_addr( Netmask ? Netmask : "255.255.255.0" ),
 175                                Adapter->IfMib.dwIndex,
 176                                &Adapter->NteContext,
 177                                &Adapter->NteInstance );
 178
 179         DefaultGateway = RegReadString( AdapterKey, NULL, "DefaultGateway" );
 180
 181         if( DefaultGateway ) {
 182             Adapter->RouterMib.dwForwardDest = 0;
 183             Adapter->RouterMib.dwForwardMask = 0;
 184             Adapter->RouterMib.dwForwardMetric1 = 1;
 185             Adapter->RouterMib.dwForwardIfIndex = Adapter->IfMib.dwIndex;
 186             Adapter->RouterMib.dwForwardNextHop = inet_addr(DefaultGateway);
 187             Error = CreateIpForwardEntry( &Adapter->RouterMib );
 188             if( Error )
 189                 warning("Failed to set default gateway %s: %ld\n",
 190                         DefaultGateway, Error);
 191         }
 192
 193         if( DefaultGateway ) free( DefaultGateway );
 194         if( Netmask ) free( Netmask );
 195     } else {
 196         /* Automatic case */
 197         DH_DbgPrint
 198             (MID_TRACE,("Adapter Name: [%s] (Bind Status %x) (dynamic)\n",
 199                         Adapter->DhclientInfo.name,
 200                         Adapter->BindStatus));
 201
 202         Adapter->DhclientInfo.client->state = S_INIT;
 203     }
 204
 205     if( IPAddress ) free( IPAddress );
 206
 207     return TRUE;
 208 }
 209
 210 void AdapterInit() {
 211     WSAStartup(0x0101,&wsd);
 212
 213     InitializeListHead( &AdapterList );
 214 }
 215
 216 int
 217 InterfaceConnected(MIB_IFROW IfEntry)
 218 {
 219     if (IfEntry.dwOperStatus == IF_OPER_STATUS_CONNECTED ||
 220         IfEntry.dwOperStatus == IF_OPER_STATUS_OPERATIONAL)
 221         return 1;
 222
 223     DH_DbgPrint(MID_TRACE,("Interface %d is down\n", IfEntry.dwIndex));
 224     return 0;
 225 }
 226
 227 /*
 228  * XXX Figure out the way to bind a specific adapter to a socket.
 229  */
 230 DWORD WINAPI AdapterDiscoveryThread(LPVOID Unused) {
 231     PMIB_IFTABLE Table = (PMIB_IFTABLE) malloc(sizeof(MIB_IFTABLE));
 232     DWORD Error, Size = sizeof(MIB_IFTABLE);
 233     PDHCP_ADAPTER Adapter = NULL;
 234     struct interface_info *ifi = NULL;
 235     int i;
 236
 237     /* FIXME: Kill this thread when the service is stopped */
 238
 239     do {
 240        DH_DbgPrint(MID_TRACE,("Getting Adapter List...\n"));
 241
 242        while( (Error = GetIfTable(Table, &Size, 0 )) ==
 243                ERROR_INSUFFICIENT_BUFFER ) {
 244            DH_DbgPrint(MID_TRACE,("Error %d, New Buffer Size: %d\n", Error, Size));
 245            free( Table );
 246            Table = (PMIB_IFTABLE) malloc( Size );
 247        }
 248
 249        if( Error != NO_ERROR )
 250            break;
 251
 252        DH_DbgPrint(MID_TRACE,("Got Adapter List (%d entries)\n", Table->dwNumEntries));
 253
 254        for( i = Table->dwNumEntries - 1; i >= 0; i-- ) {
 255             DH_DbgPrint(MID_TRACE,("Getting adapter %d attributes\n",
 256                                    Table->table[i].dwIndex));
 257
 258             ApiLock();
 259
 260             if ((Adapter = AdapterFindByHardwareAddress(Table->table[i].bPhysAddr, Table->table[i].dwPhysAddrLen)))
 261             {
 262                 /* This is an existing adapter */
 263                 if (InterfaceConnected(Table->table[i])) {
 264                     /* We're still active so we stay in the list */
 265                     ifi = &Adapter->DhclientInfo;
 266                 } else {
 267                     /* We've lost our link so out we go */
 268                     RemoveEntryList(&Adapter->ListEntry);
 269                     free(Adapter);
 270                 }
 271
 272                 ApiUnlock();
 273
 274                 continue;
 275             }
 276
 277             ApiUnlock();
 278
 279             Adapter = (DHCP_ADAPTER*) calloc( sizeof( DHCP_ADAPTER ) + Table->table[i].dwMtu, 1 );
 280
 281             if( Adapter && Table->table[i].dwType == MIB_IF_TYPE_ETHERNET && InterfaceConnected(Table->table[i])) {
 282                 memcpy( &Adapter->IfMib, &Table->table[i],
 283                         sizeof(Adapter->IfMib) );
 284                 Adapter->DhclientInfo.client = &Adapter->DhclientState;
 285                 Adapter->DhclientInfo.rbuf = Adapter->recv_buf;
 286                 Adapter->DhclientInfo.rbuf_max = Table->table[i].dwMtu;
 287                 Adapter->DhclientInfo.rbuf_len =
 288                     Adapter->DhclientInfo.rbuf_offset = 0;
 289                 memcpy(Adapter->DhclientInfo.hw_address.haddr,
 290                        Adapter->IfMib.bPhysAddr,
 291                        Adapter->IfMib.dwPhysAddrLen);
 292                 Adapter->DhclientInfo.hw_address.hlen = Adapter->IfMib.dwPhysAddrLen;
 293
 294                 /* I'm not sure where else to set this, but
 295                    some DHCP servers won't take a zero.
 296                    We checked the hardware type earlier in
 297                    the if statement. */
 298                 Adapter->DhclientInfo.hw_address.htype = HTYPE_ETHER;
 299
 300                 if( DhcpSocket == INVALID_SOCKET ) {
 301                     DhcpSocket =
 302                         Adapter->DhclientInfo.rfdesc =
 303                         Adapter->DhclientInfo.wfdesc =
 304                         socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
 305
 306                     if (DhcpSocket != INVALID_SOCKET) {
 307                         Adapter->ListenAddr.sin_family = AF_INET;
 308                         Adapter->ListenAddr.sin_port = htons(LOCAL_PORT);
 309                         Adapter->BindStatus =
 310                              (bind( Adapter->DhclientInfo.rfdesc,
 311                                     (struct sockaddr *)&Adapter->ListenAddr,
 312                                     sizeof(Adapter->ListenAddr) ) == 0) ?
 313                              0 : WSAGetLastError();
 314                     } else {
 315                         error("socket() failed: %d\n", WSAGetLastError());
 316                     }
 317                 } else {
 318                     Adapter->DhclientInfo.rfdesc =
 319                         Adapter->DhclientInfo.wfdesc = DhcpSocket;
 320                 }
 321
 322                 Adapter->DhclientConfig.timeout = DHCP_PANIC_TIMEOUT;
 323                 Adapter->DhclientConfig.initial_interval = DHCP_DISCOVER_INTERVAL;
 324                 Adapter->DhclientConfig.retry_interval = DHCP_DISCOVER_INTERVAL;
 325                 Adapter->DhclientConfig.select_interval = 1;
 326                 Adapter->DhclientConfig.reboot_timeout = DHCP_REBOOT_TIMEOUT;
 327                 Adapter->DhclientConfig.backoff_cutoff = DHCP_BACKOFF_MAX;
 328                 Adapter->DhclientState.interval =
 329                     Adapter->DhclientConfig.retry_interval;
 330
 331                 if( PrepareAdapterForService( Adapter ) ) {
 332                     Adapter->DhclientInfo.next = ifi;
 333                     ifi = &Adapter->DhclientInfo;
 334
 335                     read_client_conf(&Adapter->DhclientInfo);
 336
 337                     if (Adapter->DhclientInfo.client->state == S_INIT)
 338                     {
 339                         add_protocol(Adapter->DhclientInfo.name,
 340                                      Adapter->DhclientInfo.rfdesc,
 341                                      got_one, &Adapter->DhclientInfo);
 342
 343                         state_init(&Adapter->DhclientInfo);
 344                     }
 345
 346                     ApiLock();
 347                     InsertTailList( &AdapterList, &Adapter->ListEntry );
 348                     ApiUnlock();
 349                 } else { free( Adapter ); Adapter = 0; }
 350             } else { free( Adapter ); Adapter = 0; }
 351
 352             if( !Adapter )
 353                 DH_DbgPrint(MID_TRACE,("Adapter %d was rejected\n",
 354                                        Table->table[i].dwIndex));
 355         }
 356     } while ((Error = NotifyAddrChange(NULL, NULL)) == NO_ERROR);
 357
 358     DbgPrint("DHCPCSVC: Adapter discovery thread is terminating! (Error: %d)\n", Error);
 359
 360     if( Table ) free( Table );
 361     return Error;
 362 }
 363
 364 BOOLEAN StartAdapterDiscovery(VOID) {
 365     HANDLE ThreadHandle;
 366
 367     ThreadHandle = CreateThread(NULL,
 368                                 0,
 369                                 AdapterDiscoveryThread,
 370                                 NULL,
 371                                 0,
 372                                 NULL);
 373
 374     if (ThreadHandle == NULL)
 375         return FALSE;
 376
 377     CloseHandle(ThreadHandle);
 378
 379     return TRUE;
 380 }
 381
 382 void AdapterStop() {
 383     PLIST_ENTRY ListEntry;
 384     PDHCP_ADAPTER Adapter;
 385     ApiLock();
 386     while( !IsListEmpty( &AdapterList ) ) {
 387         ListEntry = (PLIST_ENTRY)RemoveHeadList( &AdapterList );
 388         Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 389         free( Adapter );
 390     }
 391     ApiUnlock();
 392     WSACleanup();
 393 }
 394
 395 PDHCP_ADAPTER AdapterFindIndex( unsigned int indx ) {
 396     PDHCP_ADAPTER Adapter;
 397     PLIST_ENTRY ListEntry;
 398
 399     for( ListEntry = AdapterList.Flink;
 400          ListEntry != &AdapterList;
 401          ListEntry = ListEntry->Flink ) {
 402         Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 403         if( Adapter->IfMib.dwIndex == indx ) return Adapter;
 404     }
 405
 406     return NULL;
 407 }
 408
 409 PDHCP_ADAPTER AdapterFindName( const WCHAR *name ) {
 410     PDHCP_ADAPTER Adapter;
 411     PLIST_ENTRY ListEntry;
 412
 413     for( ListEntry = AdapterList.Flink;
 414          ListEntry != &AdapterList;
 415          ListEntry = ListEntry->Flink ) {
 416         Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 417         if( !wcsicmp( Adapter->IfMib.wszName, name ) ) return Adapter;
 418     }
 419
 420     return NULL;
 421 }
 422
 423 PDHCP_ADAPTER AdapterFindInfo( struct interface_info *ip ) {
 424     PDHCP_ADAPTER Adapter;
 425     PLIST_ENTRY ListEntry;
 426
 427     for( ListEntry = AdapterList.Flink;
 428          ListEntry != &AdapterList;
 429          ListEntry = ListEntry->Flink ) {
 430         Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 431         if( ip == &Adapter->DhclientInfo ) return Adapter;
 432     }
 433
 434     return NULL;
 435 }
 436
 437 PDHCP_ADAPTER AdapterFindByHardwareAddress( u_int8_t haddr[16], u_int8_t hlen ) {
 438     PDHCP_ADAPTER Adapter;
 439     PLIST_ENTRY ListEntry;
 440
 441     for(ListEntry = AdapterList.Flink;
 442         ListEntry != &AdapterList;
 443         ListEntry = ListEntry->Flink) {
 444        Adapter = CONTAINING_RECORD( ListEntry, DHCP_ADAPTER, ListEntry );
 445        if (Adapter->DhclientInfo.hw_address.hlen == hlen &&
 446            !memcmp(Adapter->DhclientInfo.hw_address.haddr,
 447                   haddr,
 448                   hlen)) return Adapter;
 449     }
 450
 451     return NULL;
 452 }
 453
 454 PDHCP_ADAPTER AdapterGetFirst() {
 455     if( IsListEmpty( &AdapterList ) ) return NULL; else {
 456         return CONTAINING_RECORD
 457             ( AdapterList.Flink, DHCP_ADAPTER, ListEntry );
 458     }
 459 }
 460
 461 PDHCP_ADAPTER AdapterGetNext( PDHCP_ADAPTER This )
 462 {
 463     if( This->ListEntry.Flink == &AdapterList ) return NULL;
 464     return CONTAINING_RECORD
 465         ( This->ListEntry.Flink, DHCP_ADAPTER, ListEntry );
 466 }
 467
 468 void if_register_send(struct interface_info *ip) {
 469
 470 }
 471
 472 void if_register_receive(struct interface_info *ip) {
 473 }