1 /* $NetBSD: ndbootd.c,v 1.5 2002/04/09 02:39:14 thorpej Exp $ */ 2 3 /* ndbootd.c - the Sun Network Disk (nd) daemon: */ 4 5 /* 6 * Copyright (c) 2001 Matthew Fredette. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Matthew Fredette. 19 * 4. The name of Matthew Fredette may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 26 */ 27 28 /* <<Header: /data/home/fredette/project/THE-WEIGHT-CVS/ndbootd/ndbootd.c,v 1.9 2001/06/13 21:19:11 fredette Exp >> */ 29 30 /* 31 * <<Log: ndbootd.c,v >> 32 * Revision 1.9 2001/06/13 21:19:11 fredette 33 * (main): Don't assume that a successful, but short, read 34 * leaves a zero in errno. Instead, just check for the short 35 * read by looking at the byte count that read returned. 36 * 37 * Revision 1.8 2001/05/23 02:35:36 fredette 38 * Changed many debugging printfs to compile quietly on the 39 * alpha. Patch from Andrew Brown <atatat@atatdot.net>. 40 * 41 * Revision 1.7 2001/05/22 13:13:20 fredette 42 * Ran indent(1) with NetBSD's KNF-approximating profile. 43 * 44 * Revision 1.6 2001/05/22 12:53:40 fredette 45 * [HAVE_STRICT_ALIGNMENT]: Added code to copy packet headers 46 * between the buffer and local variables, to satisfy 47 * alignment constraints. 48 * 49 * Revision 1.5 2001/05/15 14:43:24 fredette 50 * Now have prototypes for the allocation functions. 51 * (main): Now handle boot blocks that aren't an integral 52 * multiple of the block size. 53 * 54 * Revision 1.4 2001/05/09 20:53:38 fredette 55 * (main): Now insert a small delay before sending each packet. 56 * Sending packets too quickly apparently overwhelms clients. 57 * Added new single-letter versions of all options that didn't 58 * already have them. Expanded some debug messages, and fixed 59 * others to display Ethernet addresses correctly. 60 * 61 * Revision 1.3 2001/01/31 17:35:50 fredette 62 * (main): Fixed various printf argument lists. 63 * 64 * Revision 1.2 2001/01/30 15:35:38 fredette 65 * Now, ndbootd assembles disk images for clients on-the-fly. 66 * Defined many new macros related to this. 67 * (main): Added support for the --boot2 option. Turned the 68 * original disk-image filename into the filename of the 69 * first-stage boot program. Now do better multiple-client 70 * support, especially when it comes to checking if a client 71 * is really ours. Now assemble client-specific disk images 72 * on-the-fly, potentially serving each client a different 73 * second-stage boot. 74 * 75 * Revision 1.1 2001/01/29 15:12:13 fredette 76 * Added. 77 * 78 */ 79 80 #include <sys/cdefs.h> 81 #if 0 82 static const char _ndbootd_c_rcsid[] = "<<Id: ndbootd.c,v 1.9 2001/06/13 21:19:11 fredette Exp >>"; 83 #else 84 __RCSID("$NetBSD: ndbootd.c,v 1.5 2002/04/09 02:39:14 thorpej Exp $"); 85 #endif 86 87 /* includes: */ 88 #include "ndbootd.h" 89 90 /* the number of blocks that Sun-2 PROMs load, starting from block 91 zero: */ 92 #define NDBOOTD_PROM_BLOCK_COUNT (16) 93 94 /* the first block number of the (dummy) Sun disklabel: */ 95 #define NDBOOTD_SUNDK_BLOCK_FIRST (0) 96 97 /* the number of blocks in the (dummy) Sun disklabel: */ 98 #define NDBOOTD_SUNDK_BLOCK_COUNT (1) 99 100 /* the first block number of the first-stage boot program. 101 the first-stage boot program begins right after the (dummy) 102 Sun disklabel: */ 103 #define NDBOOTD_BOOT1_BLOCK_FIRST (NDBOOTD_SUNDK_BLOCK_FIRST + NDBOOTD_SUNDK_BLOCK_COUNT) 104 105 /* the number of blocks in the first-stage boot program: */ 106 #define NDBOOTD_BOOT1_BLOCK_COUNT (NDBOOTD_PROM_BLOCK_COUNT - NDBOOTD_BOOT1_BLOCK_FIRST) 107 108 /* the first block number of any second-stage boot program. 109 any second-stage boot program begins right after the first-stage boot program: */ 110 #define NDBOOTD_BOOT2_BLOCK_FIRST (NDBOOTD_BOOT1_BLOCK_FIRST + NDBOOTD_BOOT1_BLOCK_COUNT) 111 112 /* this macro returns the number of bytes available in an object starting at a given offset: */ 113 #define NDBOOTD_BYTES_AVAIL(block_number, byte_offset, obj_block_first, obj_block_count) \ 114 ((((ssize_t) (obj_block_count) - (ssize_t) ((block_number) - (obj_block_first))) * NDBOOT_BSIZE) - (ssize_t) (byte_offset)) 115 116 /* this determines how long we can cache file descriptors and RARP 117 information: */ 118 #define NDBOOTD_CLIENT_TTL_SECONDS (10) 119 120 /* this determines how long we wait before sending a packet: */ 121 #define NDBOOTD_SEND_DELAY_USECONDS (10000) 122 123 /* this macro helps us size a struct ifreq: */ 124 #ifdef HAVE_SOCKADDR_SA_LEN 125 #define SIZEOF_IFREQ(ifr) (sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len) 126 #else /* !HAVE_SOCKADDR_SA_LEN */ 127 #define SIZEOF_IFREQ(ifr) (sizeof(ifr->ifr_name) + sizeof(struct sockaddr)) 128 #endif /* !HAVE_SOCKADDR_SA_LEN */ 129 130 /* prototypes: */ 131 void *ndbootd_malloc _NDBOOTD_P((size_t)); 132 void *ndbootd_malloc0 _NDBOOTD_P((size_t)); 133 void *ndbootd_memdup _NDBOOTD_P((void *, size_t)); 134 135 /* globals: */ 136 const char *_ndbootd_argv0; 137 #ifdef _NDBOOTD_DO_DEBUG 138 int _ndbootd_debug; 139 #endif /* _NDBOOTD_DO_DEBUG */ 140 141 /* allocators: */ 142 void * 143 ndbootd_malloc(size_t size) 144 { 145 void *buffer; 146 if ((buffer = malloc(size)) == NULL) { 147 abort(); 148 } 149 return (buffer); 150 } 151 void * 152 ndbootd_malloc0(size_t size) 153 { 154 void *buffer; 155 buffer = ndbootd_malloc(size); 156 memset(buffer, 0, size); 157 return (buffer); 158 } 159 void * 160 ndbootd_memdup(void *buffer0, size_t size) 161 { 162 void *buffer1; 163 buffer1 = ndbootd_malloc(size); 164 memcpy(buffer1, buffer0, size); 165 return (buffer1); 166 } 167 #define ndbootd_free free 168 #define ndbootd_new(t, c) ((t *) ndbootd_malloc(sizeof(t) * (c))) 169 #define ndbootd_new0(t, c) ((t *) ndbootd_malloc0(sizeof(t) * (c))) 170 #define ndbootd_dup(t, b, c) ((t *) ndbootd_memdup(b, c)) 171 172 /* this calculates an IP packet header checksum: */ 173 static void 174 _ndbootd_ip_cksum(struct ip * ip_packet) 175 { 176 u_int16_t *_word, word; 177 u_int32_t checksum; 178 unsigned int byte_count, bytes_left; 179 180 /* we assume that the IP packet header is 16-bit aligned: */ 181 assert((((unsigned long) ip_packet) % sizeof(word)) == 0); 182 183 /* initialize for the checksum: */ 184 checksum = 0; 185 186 /* sum up the packet contents: */ 187 _word = (u_int16_t *) ip_packet; 188 byte_count = ip_packet->ip_hl << 2; 189 for (bytes_left = byte_count; bytes_left >= sizeof(*_word);) { 190 checksum += *(_word++); 191 bytes_left -= sizeof(*_word); 192 } 193 word = 0; 194 memcpy(&word, _word, bytes_left); 195 checksum += word; 196 197 /* finish the checksum: */ 198 checksum = (checksum >> 16) + (checksum & 0xffff); 199 checksum += (checksum >> 16); 200 ip_packet->ip_sum = (~checksum); 201 } 202 /* this finds a network interface: */ 203 static struct ndbootd_interface * 204 _ndbootd_find_interface(const char *ifr_name_user) 205 { 206 int saved_errno; 207 int dummy_fd; 208 char ifreq_buffer[16384]; /* FIXME - magic constant. */ 209 struct ifconf ifc; 210 struct ifreq *ifr; 211 struct ifreq *ifr_user; 212 size_t ifr_offset; 213 struct sockaddr_in saved_ip_address; 214 short saved_flags; 215 #ifdef HAVE_AF_LINK 216 struct ifreq *link_ifreqs[20]; /* FIXME - magic constant. */ 217 size_t link_ifreqs_count; 218 size_t link_ifreqs_i; 219 struct sockaddr_dl *sadl; 220 #endif /* HAVE_AF_LINK */ 221 struct ndbootd_interface *interface; 222 223 /* make a dummy socket so we can read the interface list: */ 224 if ((dummy_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 225 return (NULL); 226 } 227 /* read the interface list: */ 228 ifc.ifc_len = sizeof(ifreq_buffer); 229 ifc.ifc_buf = ifreq_buffer; 230 if (ioctl(dummy_fd, SIOCGIFCONF, &ifc) < 0) { 231 saved_errno = errno; 232 close(dummy_fd); 233 errno = saved_errno; 234 return (NULL); 235 } 236 #ifdef HAVE_AF_LINK 237 /* start our list of link address ifreqs: */ 238 link_ifreqs_count = 0; 239 #endif /* HAVE_AF_LINK */ 240 241 /* walk the interface list: */ 242 ifr_user = NULL; 243 for (ifr_offset = 0;; ifr_offset += SIZEOF_IFREQ(ifr)) { 244 245 /* stop walking if we have run out of space in the buffer. 246 * note that before we can use SIZEOF_IFREQ, we have to make 247 * sure that there is a minimum number of bytes in the buffer 248 * to use it (namely, that there's a whole struct sockaddr 249 * available): */ 250 ifr = (struct ifreq *) (ifreq_buffer + ifr_offset); 251 if ((ifr_offset + sizeof(ifr->ifr_name) + sizeof(struct sockaddr)) > ifc.ifc_len 252 || (ifr_offset + SIZEOF_IFREQ(ifr)) > ifc.ifc_len) { 253 errno = ENOENT; 254 break; 255 } 256 #ifdef HAVE_AF_LINK 257 /* if this is a hardware address, save it: */ 258 if (ifr->ifr_addr.sa_family == AF_LINK) { 259 if (link_ifreqs_count < (sizeof(link_ifreqs) / sizeof(link_ifreqs[0]))) { 260 link_ifreqs[link_ifreqs_count++] = ifr; 261 } 262 continue; 263 } 264 #endif /* HAVE_AF_LINK */ 265 266 /* ignore this interface if it doesn't do IP: */ 267 if (ifr->ifr_addr.sa_family != AF_INET) { 268 continue; 269 } 270 /* get the interface flags, preserving the IP address in the 271 * struct ifreq across the call: */ 272 saved_ip_address = *((struct sockaddr_in *) & ifr->ifr_addr); 273 if (ioctl(dummy_fd, SIOCGIFFLAGS, ifr) < 0) { 274 ifr = NULL; 275 break; 276 } 277 saved_flags = ifr->ifr_flags; 278 *((struct sockaddr_in *) & ifr->ifr_addr) = saved_ip_address; 279 280 /* ignore this interface if it isn't up and running: */ 281 if ((saved_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) { 282 continue; 283 } 284 /* if we don't have an interface yet, take this one depending 285 * on whether the user asked for an interface by name or not. 286 * if he did, and this is it, take this one. if he didn't, 287 * and this isn't a loopback interface, take this one: */ 288 if (ifr_user == NULL 289 && (ifr_name_user != NULL 290 ? !strncmp(ifr->ifr_name, ifr_name_user, sizeof(ifr->ifr_name)) 291 : !(ifr->ifr_flags & IFF_LOOPBACK))) { 292 ifr_user = ifr; 293 } 294 } 295 296 /* close the dummy socket: */ 297 saved_errno = errno; 298 close(dummy_fd); 299 errno = saved_errno; 300 301 /* if we don't have an interface to return: */ 302 if (ifr_user == NULL) { 303 return (NULL); 304 } 305 /* start the interface description: */ 306 interface = ndbootd_new0(struct ndbootd_interface, 1); 307 308 #ifdef HAVE_AF_LINK 309 310 /* we must be able to find an AF_LINK ifreq that gives us the 311 * interface's Ethernet address. */ 312 ifr = NULL; 313 for (link_ifreqs_i = 0; link_ifreqs_i < link_ifreqs_count; link_ifreqs_i++) { 314 if (!strncmp(link_ifreqs[link_ifreqs_i]->ifr_name, 315 ifr_user->ifr_name, 316 sizeof(ifr_user->ifr_name))) { 317 ifr = link_ifreqs[link_ifreqs_i]; 318 break; 319 } 320 } 321 if (ifr == NULL) { 322 free(interface); 323 return (NULL); 324 } 325 /* copy out the Ethernet address: */ 326 sadl = (struct sockaddr_dl *) & ifr->ifr_addr; 327 memcpy(interface->ndbootd_interface_ether, LLADDR(sadl), sadl->sdl_alen); 328 329 #else /* !HAVE_AF_LINK */ 330 #error "must have AF_LINK for now" 331 #endif /* !HAVE_AF_LINK */ 332 333 /* finish this interface and return it: */ 334 interface->ndbootd_interface_ifreq = (struct ifreq *) ndbootd_memdup(ifr_user, SIZEOF_IFREQ(ifr_user)); 335 interface->ndbootd_interface_fd = -1; 336 return (interface); 337 } 338 339 int 340 main(int argc, char *argv[]) 341 { 342 int argv_i; 343 int show_usage; 344 const char *interface_name; 345 const char *boot1_file_name; 346 const char *boot2_x_name; 347 char *boot2_file_name; 348 int boot2_x_name_is_dir; 349 time_t last_open_time; 350 int boot1_fd; 351 int boot2_fd; 352 time_t last_rarp_time; 353 char last_client_ether[ETHER_ADDR_LEN]; 354 struct in_addr last_client_ip; 355 struct stat stat_buffer; 356 int32_t boot1_block_count; 357 int32_t boot2_block_count; 358 size_t boot1_byte_count; 359 size_t boot2_byte_count; 360 ssize_t byte_count_read; 361 struct ndbootd_interface *interface; 362 char pid_buffer[(sizeof(pid_t) * 3) + 2]; 363 unsigned char packet_buffer[sizeof(struct ether_header) + IP_MAXPACKET]; 364 unsigned char disk_buffer[NDBOOT_MAX_BYTE_COUNT]; 365 char hostname_buffer[MAXHOSTNAMELEN + 1]; 366 struct hostent *the_hostent; 367 ssize_t packet_length; 368 time_t now; 369 struct ether_header *ether_packet; 370 struct ip *ip_packet; 371 struct ndboot_packet *nd_packet; 372 #ifdef HAVE_STRICT_ALIGNMENT 373 struct ether_header ether_packet_buffer; 374 unsigned char ip_packet_buffer[IP_MAXPACKET]; 375 struct ndboot_packet nd_packet_buffer; 376 #endif /* HAVE_STRICT_ALIGNMENT */ 377 int nd_window_size; 378 int nd_window_filled; 379 off_t file_offset; 380 size_t disk_buffer_offset; 381 size_t block_number; 382 size_t byte_offset; 383 ssize_t byte_count; 384 ssize_t byte_count_wanted; 385 struct timeval send_delay; 386 int fd; 387 388 /* check our command line: */ 389 if ((_ndbootd_argv0 = strrchr(argv[0], '/')) == NULL) 390 _ndbootd_argv0 = argv[0]; 391 else 392 _ndbootd_argv0++; 393 show_usage = FALSE; 394 #ifdef _NDBOOTD_DO_DEBUG 395 _ndbootd_debug = FALSE; 396 #endif /* _NDBOOTD_DO_DEBUG */ 397 boot1_file_name = NULL; 398 boot2_x_name = NULL; 399 interface_name = NULL; 400 nd_window_size = NDBOOT_WINDOW_SIZE_DEFAULT; 401 for (argv_i = 1; argv_i < argc; argv_i++) { 402 if (argv[argv_i][0] != '-' 403 || argv[argv_i][1] == '\0') { 404 break; 405 } else if (!strcmp(argv[argv_i], "-s") 406 || !strcmp(argv[argv_i], "--boot2")) { 407 if (++argv_i < argc) { 408 boot2_x_name = argv[argv_i]; 409 } else { 410 show_usage = TRUE; 411 break; 412 } 413 } else if (!strcmp(argv[argv_i], "-i") 414 || !strcmp(argv[argv_i], "--interface")) { 415 if (++argv_i < argc) { 416 interface_name = argv[argv_i]; 417 } else { 418 show_usage = TRUE; 419 break; 420 } 421 } else if (!strcmp(argv[argv_i], "-w") 422 || !strcmp(argv[argv_i], "--window-size")) { 423 if (++argv_i == argc || (nd_window_size = atoi(argv[argv_i])) <= 0) { 424 show_usage = TRUE; 425 break; 426 } 427 } 428 #ifdef _NDBOOTD_DO_DEBUG 429 else if (!strcmp(argv[argv_i], "-d") 430 || !strcmp(argv[argv_i], "--debug")) { 431 _ndbootd_debug = TRUE; 432 } 433 #endif /* _NDBOOTD_DO_DEBUG */ 434 else { 435 if (strcmp(argv[argv_i], "-h") 436 && strcmp(argv[argv_i], "--help")) { 437 fprintf(stderr, "%s error: unknown switch '%s'\n", 438 _ndbootd_argv0, argv[argv_i]); 439 } 440 show_usage = TRUE; 441 break; 442 } 443 } 444 if (argv_i + 1 == argc) { 445 boot1_file_name = argv[argv_i]; 446 } else { 447 show_usage = TRUE; 448 } 449 450 if (show_usage) { 451 fprintf(stderr, "\ 452 usage: %s [OPTIONS] BOOT1-BIN\n\ 453 where OPTIONS are:\n\ 454 -s, --boot2 { BOOT2-BIN | DIR }\n\ 455 find a second-stage boot program in the file\n\ 456 BOOT2-BIN or in the directory DIR\n\ 457 -i, --interface NAME use interface NAME\n\ 458 -w, --window-size COUNT \n\ 459 send at most COUNT unacknowledged packets [default=%d]\n", 460 _ndbootd_argv0, 461 NDBOOT_WINDOW_SIZE_DEFAULT); 462 #ifdef _NDBOOTD_DO_DEBUG 463 fprintf(stderr, "\ 464 -d, --debug set debug mode\n"); 465 #endif /* _NDBOOTD_DO_DEBUG */ 466 exit(1); 467 } 468 /* if we have been given a name for the second-stage boot, see if it's 469 * a filename or a directory: */ 470 boot2_x_name_is_dir = FALSE; 471 if (boot2_x_name != NULL) { 472 if (stat(boot2_x_name, &stat_buffer) < 0) { 473 fprintf(stderr, "%s error: could not stat %s: %s\n", 474 _ndbootd_argv0, boot2_x_name, strerror(errno)); 475 exit(1); 476 } 477 if (S_ISDIR(stat_buffer.st_mode)) { 478 boot2_x_name_is_dir = TRUE; 479 } else if (!S_ISREG(stat_buffer.st_mode)) { 480 fprintf(stderr, "%s error: %s is neither a regular file nor a directory\n", 481 _ndbootd_argv0, boot2_x_name); 482 exit(1); 483 } 484 } 485 /* find the interface we will use: */ 486 if ((interface = _ndbootd_find_interface(interface_name)) == NULL) { 487 fprintf(stderr, "%s error: could not find the interface to use: %s\n", 488 _ndbootd_argv0, strerror(errno)); 489 exit(1); 490 } 491 _NDBOOTD_DEBUG((fp, "opening interface %s", interface->ndbootd_interface_ifreq->ifr_name)); 492 493 /* open the network interface: */ 494 if (ndbootd_raw_open(interface)) { 495 fprintf(stderr, "%s error: could not open the %s interface: %s\n", 496 _ndbootd_argv0, interface->ndbootd_interface_ifreq->ifr_name, strerror(errno)); 497 exit(1); 498 } 499 _NDBOOTD_DEBUG((fp, "opened interface %s (ip %s ether %02x:%02x:%02x:%02x:%02x:%02x)", 500 interface->ndbootd_interface_ifreq->ifr_name, 501 inet_ntoa(((struct sockaddr_in *) & interface->ndbootd_interface_ifreq->ifr_addr)->sin_addr), 502 ((unsigned char *) interface->ndbootd_interface_ether)[0], 503 ((unsigned char *) interface->ndbootd_interface_ether)[1], 504 ((unsigned char *) interface->ndbootd_interface_ether)[2], 505 ((unsigned char *) interface->ndbootd_interface_ether)[3], 506 ((unsigned char *) interface->ndbootd_interface_ether)[4], 507 ((unsigned char *) interface->ndbootd_interface_ether)[5])); 508 509 /* become a daemon: */ 510 #ifdef _NDBOOTD_DO_DEBUG 511 if (!_ndbootd_debug) 512 #endif /* _NDBOOTD_DO_DEBUG */ 513 { 514 515 /* fork and exit: */ 516 switch (fork()) { 517 case 0: 518 break; 519 case -1: 520 fprintf(stderr, "%s error: could not fork: %s\n", 521 _ndbootd_argv0, strerror(errno)); 522 exit(1); 523 default: 524 exit(0); 525 } 526 527 /* close all file descriptors: */ 528 #ifdef HAVE_GETDTABLESIZE 529 fd = getdtablesize(); 530 #else /* !HAVE_GETDTABLESIZE */ 531 fd = -1; 532 #endif /* !HAVE_GETDTABLESIZE */ 533 for (; fd >= 0; fd--) { 534 if (fd != interface->ndbootd_interface_fd) { 535 close(fd); 536 } 537 } 538 539 #ifdef HAVE_SETSID 540 /* become our own session: */ 541 setsid(); 542 #endif /* HAVE_SETSID */ 543 } 544 /* write the pid file: */ 545 if ((fd = open(NDBOOTD_PID_FILE, O_WRONLY | O_CREAT | O_TRUNC, 0644)) >= 0) { 546 sprintf(pid_buffer, "%u\n", getpid()); 547 write(fd, pid_buffer, strlen(pid_buffer)); 548 close(fd); 549 } 550 #ifdef HAVE_STRICT_ALIGNMENT 551 /* we will be dealing with all packet headers in separate buffers, to 552 * make sure everything is correctly aligned: */ 553 ether_packet = ðer_packet_buffer; 554 ip_packet = (struct ip *) & ip_packet_buffer[0]; 555 nd_packet = &nd_packet_buffer; 556 #else /* !HAVE_STRICT_ALIGNMENT */ 557 /* we will always find the Ethernet header and the IP packet at the 558 * front of the buffer: */ 559 ether_packet = (struct ether_header *) packet_buffer; 560 ip_packet = (struct ip *) (ether_packet + 1); 561 #endif /* !HAVE_STRICT_ALIGNMENT */ 562 563 /* initialize our state: */ 564 last_rarp_time = 0; 565 last_open_time = 0; 566 boot1_fd = -1; 567 boot2_file_name = NULL; 568 boot2_fd = -1; 569 570 /* loop processing packets: */ 571 for (;;) { 572 573 /* receive another packet: */ 574 packet_length = ndbootd_raw_read(interface, packet_buffer, sizeof(packet_buffer)); 575 if (packet_length < 0) { 576 _NDBOOTD_DEBUG((fp, "failed to receive packet: %s", strerror(errno))); 577 exit(1); 578 continue; 579 } 580 now = time(NULL); 581 582 /* check the Ethernet and IP parts of the packet: */ 583 if (packet_length 584 < (sizeof(struct ether_header) 585 + sizeof(struct ip) 586 + sizeof(struct ndboot_packet))) { 587 _NDBOOTD_DEBUG((fp, "ignoring a too-short packet of length %ld", (long) packet_length)); 588 continue; 589 } 590 #ifdef HAVE_STRICT_ALIGNMENT 591 memcpy(ether_packet, packet_buffer, sizeof(struct ether_header)); 592 memcpy(ip_packet, packet_buffer + sizeof(struct ether_header), 593 (((struct ip *) (packet_buffer + sizeof(struct ether_header)))->ip_hl << 2)); 594 #endif /* !HAVE_STRICT_ALIGNMENT */ 595 if (ether_packet->ether_type != htons(ETHERTYPE_IP) 596 || ip_packet->ip_p != IPPROTO_ND) { 597 _NDBOOTD_DEBUG((fp, "ignoring a packet with the wrong Ethernet or IP protocol")); 598 continue; 599 } 600 _ndbootd_ip_cksum(ip_packet); 601 if (ip_packet->ip_sum != 0) { 602 _NDBOOTD_DEBUG((fp, "ignoring a packet with a bad IP checksum")); 603 continue; 604 } 605 if (packet_length 606 != (sizeof(struct ether_header) 607 + (ip_packet->ip_hl << 2) 608 + sizeof(struct ndboot_packet))) { 609 _NDBOOTD_DEBUG((fp, "ignoring a packet with bad total length %ld", (long) packet_length)); 610 continue; 611 } 612 /* if we need to, refresh our RARP cache: */ 613 if ((last_rarp_time + NDBOOTD_CLIENT_TTL_SECONDS) < now 614 || memcmp(last_client_ether, ether_packet->ether_shost, ETHER_ADDR_LEN)) { 615 616 /* turn the Ethernet address into a hostname: */ 617 if (ether_ntohost(hostname_buffer, (struct ether_addr *) ether_packet->ether_shost)) { 618 _NDBOOTD_DEBUG((fp, "could not resolve %02x:%02x:%02x:%02x:%02x:%02x into a hostname: %s", 619 ((unsigned char *) ether_packet->ether_shost)[0], 620 ((unsigned char *) ether_packet->ether_shost)[1], 621 ((unsigned char *) ether_packet->ether_shost)[2], 622 ((unsigned char *) ether_packet->ether_shost)[3], 623 ((unsigned char *) ether_packet->ether_shost)[4], 624 ((unsigned char *) ether_packet->ether_shost)[5], 625 strerror(errno))); 626 continue; 627 } 628 /* turn the hostname into an IP address: */ 629 hostname_buffer[sizeof(hostname_buffer) - 1] = '\0'; 630 if ((the_hostent = gethostbyname(hostname_buffer)) == NULL 631 || the_hostent->h_addrtype != AF_INET) { 632 _NDBOOTD_DEBUG((fp, "could not resolve %s into an IP address: %s", 633 hostname_buffer, 634 strerror(errno))); 635 continue; 636 } 637 /* save these new results in our RARP cache: */ 638 last_rarp_time = now; 639 memcpy(last_client_ether, ether_packet->ether_shost, ETHER_ADDR_LEN); 640 memcpy(&last_client_ip, the_hostent->h_addr, sizeof(last_client_ip)); 641 _NDBOOTD_DEBUG((fp, "IP address for %02x:%02x:%02x:%02x:%02x:%02x is %s", 642 ((unsigned char *) last_client_ether)[0], 643 ((unsigned char *) last_client_ether)[1], 644 ((unsigned char *) last_client_ether)[2], 645 ((unsigned char *) last_client_ether)[3], 646 ((unsigned char *) last_client_ether)[4], 647 ((unsigned char *) last_client_ether)[5], 648 inet_ntoa(last_client_ip))); 649 650 /* this will cause the file descriptor cache to be 651 * reloaded, the next time we make it that far: */ 652 last_open_time = 0; 653 } 654 /* if this IP packet was broadcast, rewrite the source IP 655 * address to be the client, else, check that the client is 656 * using the correct IP addresses: */ 657 if (ip_packet->ip_dst.s_addr == htonl(0)) { 658 ip_packet->ip_src = last_client_ip; 659 } else { 660 if (ip_packet->ip_src.s_addr != 661 last_client_ip.s_addr) { 662 _NDBOOTD_DEBUG((fp, "machine %02x:%02x:%02x:%02x:%02x:%02x is using the wrong IP address\n", 663 ((unsigned char *) ether_packet->ether_shost)[0], 664 ((unsigned char *) ether_packet->ether_shost)[1], 665 ((unsigned char *) ether_packet->ether_shost)[2], 666 ((unsigned char *) ether_packet->ether_shost)[3], 667 ((unsigned char *) ether_packet->ether_shost)[4], 668 ((unsigned char *) ether_packet->ether_shost)[5])); 669 continue; 670 } 671 if (ip_packet->ip_dst.s_addr 672 != ((struct sockaddr_in *) & interface->ndbootd_interface_ifreq->ifr_addr)->sin_addr.s_addr) { 673 _NDBOOTD_DEBUG((fp, "machine %02x:%02x:%02x:%02x:%02x:%02x is sending to the wrong IP address\n", 674 ((unsigned char *) ether_packet->ether_shost)[0], 675 ((unsigned char *) ether_packet->ether_shost)[1], 676 ((unsigned char *) ether_packet->ether_shost)[2], 677 ((unsigned char *) ether_packet->ether_shost)[3], 678 ((unsigned char *) ether_packet->ether_shost)[4], 679 ((unsigned char *) ether_packet->ether_shost)[5])); 680 continue; 681 } 682 } 683 684 /* if we need to, refresh our "cache" of file descriptors for 685 * the boot programs: */ 686 if ((last_open_time + NDBOOTD_CLIENT_TTL_SECONDS) < now) { 687 688 /* close any previously opened programs: */ 689 if (boot1_fd >= 0) { 690 close(boot1_fd); 691 } 692 if (boot2_file_name != NULL) { 693 free(boot2_file_name); 694 } 695 if (boot2_fd >= 0) { 696 close(boot2_fd); 697 } 698 /* open the first-stage boot program: */ 699 if ((boot1_fd = open(boot1_file_name, O_RDONLY)) < 0) { 700 _NDBOOTD_DEBUG((fp, "could not open %s: %s", 701 boot1_file_name, strerror(errno))); 702 continue; 703 } 704 if (fstat(boot1_fd, &stat_buffer) < 0) { 705 _NDBOOTD_DEBUG((fp, "could not stat %s: %s", 706 boot1_file_name, strerror(errno))); 707 continue; 708 } 709 boot1_byte_count = stat_buffer.st_size; 710 boot1_block_count = (boot1_byte_count + (NDBOOT_BSIZE - 1)) / NDBOOT_BSIZE; 711 if (boot1_block_count > NDBOOTD_BOOT1_BLOCK_COUNT) { 712 _NDBOOTD_DEBUG((fp, "first-stage boot program %s has too many blocks (%d, max is %d)", 713 boot1_file_name, boot1_block_count, NDBOOTD_BOOT1_BLOCK_COUNT)); 714 } 715 _NDBOOTD_DEBUG((fp, "first-stage boot program %s has %d blocks", 716 boot1_file_name, boot1_block_count)); 717 718 /* open any second-stage boot program: */ 719 if (boot2_x_name != NULL) { 720 721 /* determine what the name of the second-stage 722 * boot program will be: */ 723 if (boot2_x_name_is_dir) { 724 if ((boot2_file_name = malloc(strlen(boot2_x_name) + strlen("/00000000.SUN2") + 1)) != NULL) { 725 sprintf(boot2_file_name, "%s/%02X%02X%02X%02X.SUN2", 726 boot2_x_name, 727 ((unsigned char *) &last_client_ip)[0], 728 ((unsigned char *) &last_client_ip)[1], 729 ((unsigned char *) &last_client_ip)[2], 730 ((unsigned char *) &last_client_ip)[3]); 731 } 732 } else { 733 boot2_file_name = strdup(boot2_x_name); 734 } 735 if (boot2_file_name == NULL) { 736 abort(); 737 } 738 /* open the second-stage boot program: */ 739 if ((boot2_fd = open(boot2_file_name, O_RDONLY)) < 0) { 740 _NDBOOTD_DEBUG((fp, "could not open %s: %s", 741 boot2_file_name, strerror(errno))); 742 continue; 743 } 744 if (fstat(boot2_fd, &stat_buffer) < 0) { 745 _NDBOOTD_DEBUG((fp, "could not stat %s: %s", 746 boot2_file_name, strerror(errno))); 747 continue; 748 } 749 boot2_byte_count = stat_buffer.st_size; 750 boot2_block_count = (boot2_byte_count + (NDBOOT_BSIZE - 1)) / NDBOOT_BSIZE; 751 _NDBOOTD_DEBUG((fp, "second-stage boot program %s has %d blocks", 752 boot2_file_name, boot2_block_count)); 753 } 754 /* success: */ 755 last_open_time = now; 756 } 757 /* check the nd packet: */ 758 #ifdef HAVE_STRICT_ALIGNMENT 759 memcpy(nd_packet, packet_buffer + sizeof(struct ether_header) + (ip_packet->ip_hl << 2), sizeof(struct ndboot_packet)); 760 #else /* !HAVE_STRICT_ALIGNMENT */ 761 nd_packet = (struct ndboot_packet *) (((char *) ip_packet) + (ip_packet->ip_hl << 2)); 762 #endif /* !HAVE_STRICT_ALIGNMENT */ 763 764 /* dump a bunch of debug information: */ 765 _NDBOOTD_DEBUG((fp, "recv: op 0x%02x minor 0x%02x error %d vers %d seq %d blk %d bcount %d off %d count %d", 766 nd_packet->ndboot_packet_op, 767 nd_packet->ndboot_packet_minor, 768 nd_packet->ndboot_packet_error, 769 nd_packet->ndboot_packet_disk_version, 770 (int) ntohl(nd_packet->ndboot_packet_sequence), 771 (int) ntohl(nd_packet->ndboot_packet_block_number), 772 (int) ntohl(nd_packet->ndboot_packet_byte_count), 773 (int) ntohl(nd_packet->ndboot_packet_current_byte_offset), 774 (int) ntohl(nd_packet->ndboot_packet_current_byte_count))); 775 776 /* ignore this packet if it has a bad opcode, a bad minor 777 * number, a bad disk version, a bad block number, a bad byte 778 * count, a bad current byte offset, or a bad current byte 779 * count: */ 780 /* FIXME - for some of these conditions, we probably should 781 * return an NDBOOT_OP_ERROR packet: */ 782 if ((nd_packet->ndboot_packet_op & NDBOOT_OP_MASK) != NDBOOT_OP_READ) { 783 _NDBOOTD_DEBUG((fp, "ignoring a packet with bad op %d", 784 nd_packet->ndboot_packet_op & NDBOOT_OP_MASK)); 785 continue; 786 } 787 if (nd_packet->ndboot_packet_minor != NDBOOT_MINOR_NDP0) { 788 _NDBOOTD_DEBUG((fp, "ignoring a packet with device minor %d", 789 nd_packet->ndboot_packet_minor)); 790 continue; 791 } 792 if (nd_packet->ndboot_packet_disk_version != 0) { 793 _NDBOOTD_DEBUG((fp, "ignoring a packet with disk version %d", 794 nd_packet->ndboot_packet_disk_version)); 795 continue; 796 } 797 if (ntohl(nd_packet->ndboot_packet_block_number) < 0) { 798 _NDBOOTD_DEBUG((fp, "ignoring a packet with bad block number %d", 799 (int) ntohl(nd_packet->ndboot_packet_block_number))); 800 continue; 801 } 802 if (ntohl(nd_packet->ndboot_packet_byte_count) <= 0 || 803 ntohl(nd_packet->ndboot_packet_byte_count) > NDBOOT_MAX_BYTE_COUNT) { 804 _NDBOOTD_DEBUG((fp, "ignoring a packet with bad byte count %d", 805 (int) ntohl(nd_packet->ndboot_packet_byte_count))); 806 continue; 807 } 808 if (ntohl(nd_packet->ndboot_packet_current_byte_offset) < 0 || 809 ntohl(nd_packet->ndboot_packet_current_byte_offset) 810 >= ntohl(nd_packet->ndboot_packet_byte_count)) { 811 _NDBOOTD_DEBUG((fp, "ignoring a packet with bad current offset %d", 812 (int) ntohl(nd_packet->ndboot_packet_current_byte_offset))); 813 continue; 814 } 815 if (ntohl(nd_packet->ndboot_packet_current_byte_count) < 0 || 816 ntohl(nd_packet->ndboot_packet_current_byte_count) 817 > (ntohl(nd_packet->ndboot_packet_byte_count) 818 - ntohl(nd_packet->ndboot_packet_current_byte_offset))) { 819 _NDBOOTD_DEBUG((fp, "ignoring a packet with bad current count %d", 820 (int) ntohl(nd_packet->ndboot_packet_current_byte_count))); 821 continue; 822 } 823 /* if we were given a current byte count of zero, rewrite it 824 * to be the maximum: */ 825 if (ntohl(nd_packet->ndboot_packet_current_byte_count) == 0) { 826 nd_packet->ndboot_packet_current_byte_count = 827 htonl(ntohl(nd_packet->ndboot_packet_byte_count) 828 - ntohl(nd_packet->ndboot_packet_current_byte_offset)); 829 } 830 /* read the data: */ 831 disk_buffer_offset = 0; 832 block_number = ntohl(nd_packet->ndboot_packet_block_number); 833 byte_offset = ntohl(nd_packet->ndboot_packet_current_byte_offset); 834 byte_count = ntohl(nd_packet->ndboot_packet_current_byte_count); 835 for (; byte_count > 0;) { 836 837 /* adjust the current block number and byte offset 838 * such that the byte offset is always < NDBOOT_BSIZE: */ 839 block_number += (byte_offset / NDBOOT_BSIZE); 840 byte_offset = byte_offset % NDBOOT_BSIZE; 841 842 /* dispatch on the beginning block number: */ 843 byte_count_read = 0; 844 845 /* the (dummy) Sun disk label: */ 846 if (block_number >= NDBOOTD_SUNDK_BLOCK_FIRST 847 && block_number < (NDBOOTD_SUNDK_BLOCK_FIRST + NDBOOTD_SUNDK_BLOCK_COUNT)) { 848 byte_count_read = MIN(NDBOOTD_BYTES_AVAIL(block_number, byte_offset, 849 NDBOOTD_SUNDK_BLOCK_FIRST, NDBOOTD_SUNDK_BLOCK_COUNT), 850 byte_count); 851 } 852 /* the first-stage boot program: */ 853 else if (block_number >= NDBOOTD_BOOT1_BLOCK_FIRST 854 && block_number < (NDBOOTD_BOOT1_BLOCK_FIRST + NDBOOTD_BOOT1_BLOCK_COUNT)) { 855 856 /* if any real part of the first-stage boot 857 * program is needed to satisfy the request, 858 * read it (otherwise we return garbage as 859 * padding): */ 860 byte_count_wanted = MIN(NDBOOTD_BYTES_AVAIL(block_number, byte_offset, 861 NDBOOTD_BOOT1_BLOCK_FIRST, boot1_block_count), 862 byte_count); 863 if (byte_count_wanted > 0) { 864 865 file_offset = ((block_number - NDBOOTD_BOOT1_BLOCK_FIRST) * NDBOOT_BSIZE) + byte_offset; 866 if (lseek(boot1_fd, file_offset, SEEK_SET) < 0) { 867 _NDBOOTD_DEBUG((fp, "could not seek %s to block %ld offset %ld: %s", 868 boot1_file_name, 869 (long) (block_number - NDBOOTD_BOOT1_BLOCK_FIRST), 870 (long) byte_offset, 871 strerror(errno))); 872 break; 873 } 874 byte_count_read = read(boot1_fd, disk_buffer + disk_buffer_offset, byte_count_wanted); 875 /* pretend that the size of the 876 * first-stage boot program is a 877 * multiple of NDBOOT_BSIZE: */ 878 if (byte_count_read != byte_count_wanted 879 && byte_count_read > 0 880 && file_offset + byte_count_read == boot1_byte_count) { 881 byte_count_read = byte_count_wanted; 882 } 883 if (byte_count_read != byte_count_wanted) { 884 _NDBOOTD_DEBUG((fp, "could not read %ld bytes at block %ld offset %ld from %s: %s (read %ld bytes)", 885 (long) byte_count_wanted, 886 (long) (block_number - NDBOOTD_BOOT1_BLOCK_FIRST), 887 (long) byte_offset, 888 boot1_file_name, 889 strerror(errno), 890 (long) byte_count_read)); 891 break; 892 } 893 } 894 /* the number of bytes we read, including any 895 * padding garbage: */ 896 byte_count_read = MIN(NDBOOTD_BYTES_AVAIL(block_number, byte_offset, 897 NDBOOTD_BOOT1_BLOCK_FIRST, NDBOOTD_BOOT1_BLOCK_COUNT), 898 byte_count); 899 } 900 /* any second-stage boot program: */ 901 else if (block_number >= NDBOOTD_BOOT2_BLOCK_FIRST) { 902 903 /* if any real part of any first-stage boot 904 * program is needed to satisfy the request, 905 * read it (otherwise we return garbage as 906 * padding): */ 907 byte_count_wanted = MIN(NDBOOTD_BYTES_AVAIL(block_number, byte_offset, 908 NDBOOTD_BOOT2_BLOCK_FIRST, boot2_block_count), 909 byte_count); 910 if (boot2_fd >= 0 911 && byte_count_wanted > 0) { 912 913 file_offset = ((block_number - NDBOOTD_BOOT2_BLOCK_FIRST) * NDBOOT_BSIZE) + byte_offset; 914 if (lseek(boot2_fd, file_offset, SEEK_SET) < 0) { 915 _NDBOOTD_DEBUG((fp, "could not seek %s to block %ld offset %ld: %s", 916 boot2_file_name, 917 (long) (block_number - NDBOOTD_BOOT2_BLOCK_FIRST), 918 (long) byte_offset, 919 strerror(errno))); 920 break; 921 } 922 byte_count_read = read(boot2_fd, disk_buffer + disk_buffer_offset, byte_count_wanted); 923 /* pretend that the size of the 924 * second-stage boot program is a 925 * multiple of NDBOOT_BSIZE: */ 926 if (byte_count_read != byte_count_wanted 927 && byte_count_read > 0 928 && file_offset + byte_count_read == boot2_byte_count) { 929 byte_count_read = byte_count_wanted; 930 } 931 if (byte_count_read != byte_count_wanted) { 932 _NDBOOTD_DEBUG((fp, "could not read %ld bytes at block %ld offset %ld from %s: %s (read %ld bytes)", 933 (long) byte_count_wanted, 934 (long) (block_number - NDBOOTD_BOOT2_BLOCK_FIRST), 935 (long) byte_offset, 936 boot2_file_name, 937 strerror(errno), 938 (long) byte_count_read)); 939 break; 940 } 941 } 942 /* the number of bytes we read, including any 943 * padding garbage: */ 944 byte_count_read = byte_count; 945 } 946 /* update for the amount that we read: */ 947 assert(byte_count_read > 0); 948 disk_buffer_offset += byte_count_read; 949 byte_offset += byte_count_read; 950 byte_count -= byte_count_read; 951 } 952 if (byte_count > 0) { 953 /* an error occurred: */ 954 continue; 955 } 956 /* set the Ethernet and IP destination and source addresses, 957 * and the IP TTL: */ 958 memcpy(ether_packet->ether_dhost, ether_packet->ether_shost, ETHER_ADDR_LEN); 959 memcpy(ether_packet->ether_shost, interface->ndbootd_interface_ether, ETHER_ADDR_LEN); 960 #ifdef HAVE_STRICT_ALIGNMENT 961 memcpy(packet_buffer, ether_packet, sizeof(struct ether_header)); 962 #endif /* !HAVE_STRICT_ALIGNMENT */ 963 ip_packet->ip_dst = ip_packet->ip_src; 964 ip_packet->ip_src = ((struct sockaddr_in *) & interface->ndbootd_interface_ifreq->ifr_addr)->sin_addr; 965 ip_packet->ip_ttl = 4; 966 967 /* return the data: */ 968 nd_window_filled = 0; 969 disk_buffer_offset = 0; 970 byte_count = ntohl(nd_packet->ndboot_packet_current_byte_count); 971 for (;;) { 972 973 /* set the byte count on this packet: */ 974 nd_packet->ndboot_packet_current_byte_count = htonl(MIN(byte_count, NDBOOT_MAX_PACKET_DATA)); 975 976 /* set our opcode. the opcode is always 977 * NDBOOT_OP_READ, ORed with NDBOOT_OP_FLAG_DONE | 978 * NDBOOT_OP_FLAG_WAIT if this packet finishes the 979 * request, or ORed with NDBOOT_OP_FLAG_WAIT if this 980 * packet fills the window: */ 981 nd_window_filled++; 982 nd_packet->ndboot_packet_op = 983 (NDBOOT_OP_READ 984 | ((ntohl(nd_packet->ndboot_packet_current_byte_offset) 985 + ntohl(nd_packet->ndboot_packet_current_byte_count)) 986 == ntohl(nd_packet->ndboot_packet_byte_count) 987 ? (NDBOOT_OP_FLAG_DONE 988 | NDBOOT_OP_FLAG_WAIT) 989 : (nd_window_filled == nd_window_size 990 ? NDBOOT_OP_FLAG_WAIT 991 : 0))); 992 993 /* copy the data into the packet: */ 994 memcpy(packet_buffer + 995 sizeof(struct ether_header) + (ip_packet->ip_hl << 2) + sizeof(struct ndboot_packet), 996 disk_buffer + disk_buffer_offset, 997 ntohl(nd_packet->ndboot_packet_current_byte_count)); 998 999 /* finish the IP packet and calculate the checksum: */ 1000 ip_packet->ip_len = htons((ip_packet->ip_hl << 2) 1001 + sizeof(struct ndboot_packet) 1002 + ntohl(nd_packet->ndboot_packet_current_byte_count)); 1003 ip_packet->ip_sum = 0; 1004 _ndbootd_ip_cksum(ip_packet); 1005 1006 #ifdef HAVE_STRICT_ALIGNMENT 1007 memcpy(packet_buffer + sizeof(struct ether_header), ip_packet, ip_packet->ip_hl << 2); 1008 memcpy(packet_buffer + sizeof(struct ether_header) + (ip_packet->ip_hl << 2), nd_packet, sizeof(struct ndboot_packet)); 1009 #endif /* !HAVE_STRICT_ALIGNMENT */ 1010 1011 /* dump a bunch of debug information: */ 1012 _NDBOOTD_DEBUG((fp, "send: op 0x%02x minor 0x%02x error %d vers %d seq %d blk %d bcount %d off %d count %d (win %d)", 1013 nd_packet->ndboot_packet_op, 1014 nd_packet->ndboot_packet_minor, 1015 nd_packet->ndboot_packet_error, 1016 nd_packet->ndboot_packet_disk_version, 1017 (int) ntohl(nd_packet->ndboot_packet_sequence), 1018 (int) ntohl(nd_packet->ndboot_packet_block_number), 1019 (int) ntohl(nd_packet->ndboot_packet_byte_count), 1020 (int) ntohl(nd_packet->ndboot_packet_current_byte_offset), 1021 (int) ntohl(nd_packet->ndboot_packet_current_byte_count), 1022 nd_window_filled - 1)); 1023 1024 /* delay before sending the packet: */ 1025 send_delay.tv_sec = 0; 1026 send_delay.tv_usec = NDBOOTD_SEND_DELAY_USECONDS; 1027 select(0, NULL, NULL, NULL, &send_delay); 1028 1029 /* transmit the packet: */ 1030 if (ndbootd_raw_write(interface, packet_buffer, 1031 sizeof(struct ether_header) + (ip_packet->ip_hl << 2) + sizeof(struct ndboot_packet) + ntohl(nd_packet->ndboot_packet_current_byte_count)) < 0) { 1032 _NDBOOTD_DEBUG((fp, "could not write a packet: %s", 1033 strerror(errno))); 1034 } 1035 /* if we set NDBOOT_OP_FLAG_DONE or 1036 * NDBOOT_OP_FLAG_WAIT in the packet we just sent, 1037 * we're done sending: */ 1038 if (nd_packet->ndboot_packet_op != NDBOOT_OP_READ) { 1039 break; 1040 } 1041 /* advance to the next packet: */ 1042 byte_count -= ntohl(nd_packet->ndboot_packet_current_byte_count); 1043 disk_buffer_offset += ntohl(nd_packet->ndboot_packet_current_byte_count); 1044 nd_packet->ndboot_packet_current_byte_offset = 1045 htonl(ntohl(nd_packet->ndboot_packet_current_byte_offset) 1046 + ntohl(nd_packet->ndboot_packet_current_byte_count)); 1047 } 1048 } 1049 /* NOTREACHED */ 1050 } 1051 /* the raw Ethernet access code: */ 1052 #include "config/ndbootd-bpf.c" 1053