This application demonstrates the various datagram operations possible from NetBIOS. This includes sending and receiving both directed and group datagrams as well as broadcast datagrams. The name service operates on UDP port 137 (TCP port 137 can also be used, but rarely is).
Compile
cl -o Nbdgram.exe Nbdgram.c ..\Common\Nbcommon.obj Netapi32.lib User32.lib
Command Line Options
nbdgram.exe options
- -n:NAME Register my unique name NAME
- -g:NAME Register my group name NAME
- -s I will be sending datagrams
- -c:xxx Number of datagrams to send
- -r:NAME The recipients NetBIOS name
- -b Use broadcast datagrams
- -a Receive datagrams for any NetBIOS name
- -l:xxx Send datagrams on LANA number xxx only
- -d:xxx Delay (in milliseconds) between sends
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 | #include <stdio.h> #include <windows.h> #include <stdlib.h> #include "..\Common\nbcommon.h" #define MAX_SESSIONS 254 #define MAX_NAMES 254 #define MAX_DATAGRAM_SIZE 512 BOOL bSender = FALSE, // Send or receive datagrams bRecvAny = FALSE, // Receive for any name bUniqueName = TRUE, // Register my name as unique? bBroadcast = FALSE, // Use broadcast datagrams? bOneLana = FALSE; // Use all LANAs or just one? char szLocalName[NCBNAMSZ + 1], // Local NetBIOS name szRecipientName[NCBNAMSZ + 1]; // Recipients NetBIOS name DWORD dwNumDatagrams = 25, // Number of datagrams to sen dwOneLana, // If using one LANA, which one dwDelay = 0; // Delay between datagram send // // Function: ValidateArgs // // Description: // This function parses the command line arguments // and sets various global flags indicating the selections. // void ValidateArgs(int argc, char** argv) { int i; for (i = 1; i < argc; i++) { if (strlen(argv[i]) < 2) continue; if ((argv[i][0] == '-') || (argv[i][0] == '/')) { switch (tolower(argv[i][1])) { case 'n': // Use a unique name bUniqueName = TRUE; if (strlen(argv[i]) > 2) strcpy(szLocalName, &argv[i][3]); break; case 'g': // Use a group name bUniqueName = FALSE; if (strlen(argv[i]) > 2) strcpy(szLocalName, &argv[i][3]); break; case 's': // Send datagrams bSender = TRUE; break; case 'c': // Num datagrams to send or receive if (strlen(argv[i]) > 2) dwNumDatagrams = atoi(&argv[i][3]); break; case 'r': // Recipient's name for datagrams if (strlen(argv[i]) > 2) strcpy(szRecipientName, &argv[i][3]); break; case 'b': // Use broadcast datagrams bBroadcast = TRUE; break; case 'a': // Receive datagrams on any name bRecvAny = TRUE; break; case 'l': // Operate on this LANA only bOneLana = TRUE; if (strlen(argv[i]) > 2) dwOneLana = atoi(&argv[i][3]); break; case 'd': // Delay (millisecs) between sends if (strlen(argv[i]) > 2) dwDelay = atoi(&argv[i][3]); break; default: printf("usage: nbdgram ?\n"); break; } } } return; } // // Function: DatagramSend // // Description: // Send a directed datagram to the specified recipient on the // specified LANA number from the given name number to the // specified recipient. Also specified is the data buffer and // the number of bytes to send. // int DatagramSend(int lana, int num, char* recipient, char* buffer, int buflen) { NCB ncb; ZeroMemory(&ncb, sizeof(NCB)); ncb.ncb_command = NCBDGSEND; ncb.ncb_lana_num = lana; ncb.ncb_num = num; ncb.ncb_buffer = (PUCHAR)buffer; ncb.ncb_length = buflen; memset(ncb.ncb_callname, ' ', NCBNAMSZ); strncpy(ncb.ncb_callname, recipient, strlen(recipient)); if (Netbios(&ncb) != NRC_GOODRET) { printf("Netbios: NCBDGSEND failed: %d\n", ncb.ncb_retcode); return ncb.ncb_retcode; } return NRC_GOODRET; } // // Function: DatagramSendBC // // Description: // Send a broadcast datagram on the specified LANA number from the // given name number. Also specified is the data buffer and number // of bytes to send. // int DatagramSendBC(int lana, int num, char* buffer, int buflen) { NCB ncb; ZeroMemory(&ncb, sizeof(NCB)); ncb.ncb_command = NCBDGSENDBC; ncb.ncb_lana_num = lana; ncb.ncb_num = num; ncb.ncb_buffer = (PUCHAR)buffer; ncb.ncb_length = buflen; if (Netbios(&ncb) != NRC_GOODRET) { printf("Netbios: NCBDGSENDBC failed: %d\n", ncb.ncb_retcode); return ncb.ncb_retcode; } return NRC_GOODRET; } // // Function: DatagramRecv // // Description: // Receive a datagram on the given LANA number directed towards the // name represented by num. Data is copied into the supplied buffer. // If hEvent is not zero then the receive call is made asynchronously // with the supplied event handle. If num is 0xFF then listen for a // datagram destined for any NetBIOS name registered by the process. // int DatagramRecv(PNCB pncb, int lana, int num, char* buffer, int buflen, HANDLE hEvent) { ZeroMemory(pncb, sizeof(NCB)); if (hEvent) { pncb->ncb_command = NCBDGRECV | ASYNCH; pncb->ncb_event = hEvent; } else pncb->ncb_command = NCBDGRECV; pncb->ncb_lana_num = lana; pncb->ncb_num = num; pncb->ncb_buffer = (PUCHAR)buffer; pncb->ncb_length = buflen; if (Netbios(pncb) != NRC_GOODRET) { printf("Netbos: NCBDGRECV failed: %d\n", pncb->ncb_retcode); return pncb->ncb_retcode; } return NRC_GOODRET; } // // Function: DatagramRecvBC // // Description: // Receive a broadcast datagram on the given LANA number. // Data is copied into the supplied buffer. If hEvent is not zero // then the receive call is made asynchronously with the supplied // event handle. // int DatagramRecvBC(PNCB pncb, int lana, int num, char* buffer, int buflen, HANDLE hEvent) { ZeroMemory(pncb, sizeof(NCB)); if (hEvent) { pncb->ncb_command = NCBDGRECVBC | ASYNCH; pncb->ncb_event = hEvent; } else pncb->ncb_command = NCBDGRECVBC; pncb->ncb_lana_num = lana; pncb->ncb_num = num; pncb->ncb_buffer = (PUCHAR)buffer; pncb->ncb_length = buflen; if (Netbios(pncb) != NRC_GOODRET) { printf("Netbios: NCBDGRECVBC failed: %d\n", pncb->ncb_retcode); return pncb->ncb_retcode; } return NRC_GOODRET; } // // Function: main // // Description: // Initialize the NetBIOS interface, allocate resources, and then // send or receive datagrams according to the user's options. // int main(int argc, char** argv) { LANA_ENUM lenum; int i, j; char szMessage[MAX_DATAGRAM_SIZE], szSender[NCBNAMSZ + 1]; DWORD* dwNum = NULL, dwBytesRead, dwErr; ValidateArgs(argc, argv); // // Enumerate and reset the LANA numbers // if ((dwErr = LanaEnum(&lenum)) != NRC_GOODRET) { printf("LanaEnum failed: %d\n", dwErr); return 1; } if ((dwErr = ResetAll(&lenum, (UCHAR)MAX_SESSIONS, (UCHAR)MAX_NAMES, FALSE)) != NRC_GOODRET) { printf("ResetAll failed: %d\n", dwErr); return 1; } // // This buffer holds the name number for the NetBIOS name added // to each LANA // dwNum = (DWORD*)GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, sizeof(DWORD) * lenum.length); if (dwNum == NULL) { printf("out of memory\n"); return 1; } // // If we're going to operate only on one LANA register the name // only on that specified LANA; otherwise register it on all. // if (bOneLana) { if (bUniqueName) AddName(dwOneLana, szLocalName, &dwNum[0]); else AddGroupName(dwOneLana, szLocalName, &dwNum[0]); } else { for (i = 0; i < lenum.length; i++) { if (bUniqueName) AddName(lenum.lana[i], szLocalName, &dwNum[i]); else AddGroupName(lenum.lana[i], szLocalName, &dwNum[i]); } } // We are sending datagrams // if (bSender) { // Broadcast sender // if (bBroadcast) { if (bOneLana) { // Broadcast the message on the one LANA only // for (j = 0; j < dwNumDatagrams; j++) { wsprintf(szMessage, "[%03d] Test broadcast datagram", j); if (DatagramSendBC(dwOneLana, dwNum[0], szMessage, strlen(szMessage)) != NRC_GOODRET) return 1; Sleep(dwDelay); } } else { // Broadcast the message on every LANA on the local // machine // for (j = 0; j < dwNumDatagrams; j++) { for (i = 0; i < lenum.length; i++) { wsprintf(szMessage, "[%03d] Test broadcast datagram", j); if (DatagramSendBC(lenum.lana[i], dwNum[i], szMessage, strlen(szMessage)) != NRC_GOODRET) return 1; } Sleep(dwDelay); } } } else { if (bOneLana) { // Send a directed message to the one LANA specified // for (j = 0; j < dwNumDatagrams; j++) { wsprintf(szMessage, "[%03d] Test directed datagram", j); if (DatagramSend(dwOneLana, dwNum[0], szRecipientName, szMessage, strlen(szMessage)) != NRC_GOODRET) return 1; Sleep(dwDelay); } } else { // Send a directed message to the each LANA on the // local machine // for (j = 0; j < dwNumDatagrams; j++) { for (i = 0; i < lenum.length; i++) { wsprintf(szMessage, "[%03d] Test directed datagram", j); printf("count: %d.%d\n", j, i); if (DatagramSend(lenum.lana[i], dwNum[i], szRecipientName, szMessage, strlen(szMessage)) != NRC_GOODRET) return 1; } Sleep(dwDelay); } } } } else // We are receiving datagrams { NCB* ncb = NULL; char** szMessageArray = NULL; HANDLE* hEvent = NULL; DWORD dwRet; // Allocate an array of NCB structure to submit to each recv // on each LANA // ncb = (NCB*)GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, sizeof(NCB) * lenum.length); // // Allocate an array of incoming data buffers // szMessageArray = (char**)GlobalAlloc(GMEM_FIXED, sizeof(char*) * lenum.length); for (i = 0; i < lenum.length; i++) szMessageArray[i] = (char*)GlobalAlloc(GMEM_FIXED, MAX_DATAGRAM_SIZE); // // Allocate an array of event handles for // asynchronous receives // hEvent = (HANDLE*)GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, sizeof(HANDLE) * lenum.length); for (i = 0; i < lenum.length; i++) hEvent[i] = CreateEvent(0, TRUE, FALSE, 0); if (bBroadcast) { if (bOneLana) { // Post synchronous broadcast receives on // the one LANA specified // for (j = 0; j < dwNumDatagrams; j++) { if (DatagramRecvBC(&ncb[0], dwOneLana, dwNum[0], szMessageArray[0], MAX_DATAGRAM_SIZE, NULL) != NRC_GOODRET) return 1; FormatNetbiosName(ncb[0].ncb_callname, szSender); printf("%03d [LANA %d] Message: '%s' " "received from: %s\n", j, ncb[0].ncb_lana_num, szMessageArray[0], szSender); } } else { // Post asynchronous broadcast receives on each LANA // number available. For each command that succeeded // print the message otherwise cancel the command. // for (j = 0; j < dwNumDatagrams; j++) { for (i = 0; i < lenum.length; i++) { dwBytesRead = MAX_DATAGRAM_SIZE; if (DatagramRecvBC(&ncb[i], lenum.lana[i], dwNum[i], szMessageArray[i], MAX_DATAGRAM_SIZE, hEvent[i]) != NRC_GOODRET) return 1; } dwRet = WaitForMultipleObjects(lenum.length, hEvent, FALSE, INFINITE); if (dwRet == WAIT_FAILED) { printf("WaitForMultipleObjects failed: %d\n", GetLastError()); return 1; } for (i = 0; i < lenum.length; i++) { if (ncb[i].ncb_cmd_cplt == NRC_PENDING) Cancel(&ncb[i]); else { ncb[i].ncb_buffer[ncb[i].ncb_length] = 0; FormatNetbiosName(ncb[i].ncb_callname, szSender); printf("%03d [LANA %d] Message: '%s' " "received from: %s\n", j, ncb[i].ncb_lana_num, szMessageArray[i], szSender); } ResetEvent(hEvent[i]); } } } } else { if (bOneLana) { // Make a blocking datagram receive on the specified // LANA number. // for (j = 0; j < dwNumDatagrams; j++) { if (bRecvAny) { // Receive data destined for any NetBIOS name // in this process's name table. // if (DatagramRecv(&ncb[0], dwOneLana, 0xFF, szMessageArray[0], MAX_DATAGRAM_SIZE, NULL) != NRC_GOODRET) return 1; } else { if (DatagramRecv(&ncb[0], dwOneLana, dwNum[0], szMessageArray[0], MAX_DATAGRAM_SIZE, NULL) != NRC_GOODRET) return 1; } FormatNetbiosName(ncb[0].ncb_callname, szSender); printf("%03d [LANA %d] Message: '%s' " "received from: %s\n", j, ncb[0].ncb_lana_num, szMessageArray[0], szSender); } } else { // Post asynchronous datagram receives on each LANA // available. For all those commands that succeeded, // print the data, otherwise cancel the command. // for (j = 0; j < dwNumDatagrams; j++) { for (i = 0; i < lenum.length; i++) { if (bRecvAny) { // Receive data destined for any NetBIOS // name in this process's name table. // if (DatagramRecv(&ncb[i], lenum.lana[i], 0xFF, szMessageArray[i], MAX_DATAGRAM_SIZE, hEvent[i]) != NRC_GOODRET) return 1; } else { if (DatagramRecv(&ncb[i], lenum.lana[i], dwNum[i], szMessageArray[i], MAX_DATAGRAM_SIZE, hEvent[i]) != NRC_GOODRET) return 1; } } dwRet = WaitForMultipleObjects(lenum.length, hEvent, FALSE, INFINITE); if (dwRet == WAIT_FAILED) { printf("WaitForMultipleObjects failed: %d\n", GetLastError()); return 1; } for (i = 0; i < lenum.length; i++) { if (ncb[i].ncb_cmd_cplt == NRC_PENDING) Cancel(&ncb[i]); else { ncb[i].ncb_buffer[ncb[i].ncb_length] = 0; FormatNetbiosName(ncb[i].ncb_callname, szSender); printf("%03d [LANA %d] Message: '%s' " "from: %s\n", j, ncb[i].ncb_lana_num, szMessageArray[i], szSender); } ResetEvent(hEvent[i]); } } } } // Clean up // for (i = 0; i < lenum.length; i++) { CloseHandle(hEvent[i]); GlobalFree(szMessageArray[i]); } GlobalFree(hEvent); GlobalFree(szMessageArray); } // Clean things up // if (bOneLana) DelName(dwOneLana, szLocalName); else { for (i = 0; i < lenum.length; i++) DelName(lenum.lana[i], szLocalName); } GlobalFree(dwNum); return 0; } |
