1 /************************************************************************ 2 Copyright 1988, 1991 by Carnegie Mellon University 3 4 All Rights Reserved 5 6 Permission to use, copy, modify, and distribute this software and its 7 documentation for any purpose and without fee is hereby granted, provided 8 that the above copyright notice appear in all copies and that both that 9 copyright notice and this permission notice appear in supporting 10 documentation, and that the name of Carnegie Mellon University not be used 11 in advertising or publicity pertaining to distribution of the software 12 without specific, written prior permission. 13 14 CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS 15 SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 16 IN NO EVENT SHALL CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL 17 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 18 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 19 ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 20 SOFTWARE. 21 ************************************************************************/ 22 23 #include <sys/cdefs.h> 24 #ifndef lint 25 __RCSID("$NetBSD: readfile.c,v 1.10 2002/07/14 00:30:03 wiz Exp $"); 26 #endif 27 28 29 /* 30 * bootpd configuration file reading code. 31 * 32 * The routines in this file deal with reading, interpreting, and storing 33 * the information found in the bootpd configuration file (usually 34 * /etc/bootptab). 35 */ 36 37 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <sys/file.h> 41 #include <sys/time.h> 42 #include <netinet/in.h> 43 44 #include <errno.h> 45 #include <stdlib.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <time.h> 49 #include <ctype.h> 50 #include <assert.h> 51 #include <syslog.h> 52 53 #ifndef USE_BFUNCS 54 #include <memory.h> 55 /* Yes, memcpy is OK here (no overlapped copies). */ 56 #define bcopy(a,b,c) memcpy(b,a,c) 57 #define bzero(p,l) memset(p,0,l) 58 #define bcmp(a,b,c) memcmp(a,b,c) 59 #endif 60 61 #include "bootp.h" 62 #include "hash.h" 63 #include "hwaddr.h" 64 #include "lookup.h" 65 #include "readfile.h" 66 #include "report.h" 67 #include "tzone.h" 68 #include "bootpd.h" 69 70 #define HASHTABLESIZE 257 /* Hash table size (prime) */ 71 72 /* Non-standard hardware address type (see bootp.h) */ 73 #define HTYPE_DIRECT 0 74 75 /* Error codes returned by eval_symbol: */ 76 #define SUCCESS 0 77 #define E_END_OF_ENTRY (-1) 78 #define E_SYNTAX_ERROR (-2) 79 #define E_UNKNOWN_SYMBOL (-3) 80 #define E_BAD_IPADDR (-4) 81 #define E_BAD_HWADDR (-5) 82 #define E_BAD_LONGWORD (-6) 83 #define E_BAD_HWATYPE (-7) 84 #define E_BAD_PATHNAME (-8) 85 #define E_BAD_VALUE (-9) 86 87 /* Tag idendities. */ 88 #define SYM_NULL 0 89 #define SYM_BOOTFILE 1 90 #define SYM_COOKIE_SERVER 2 91 #define SYM_DOMAIN_SERVER 3 92 #define SYM_GATEWAY 4 93 #define SYM_HWADDR 5 94 #define SYM_HOMEDIR 6 95 #define SYM_HTYPE 7 96 #define SYM_IMPRESS_SERVER 8 97 #define SYM_IPADDR 9 98 #define SYM_LOG_SERVER 10 99 #define SYM_LPR_SERVER 11 100 #define SYM_NAME_SERVER 12 101 #define SYM_RLP_SERVER 13 102 #define SYM_SUBNET_MASK 14 103 #define SYM_TIME_OFFSET 15 104 #define SYM_TIME_SERVER 16 105 #define SYM_VENDOR_MAGIC 17 106 #define SYM_SIMILAR_ENTRY 18 107 #define SYM_NAME_SWITCH 19 108 #define SYM_BOOTSIZE 20 109 #define SYM_BOOT_SERVER 22 110 #define SYM_TFTPDIR 23 111 #define SYM_DUMP_FILE 24 112 #define SYM_DOMAIN_NAME 25 113 #define SYM_SWAP_SERVER 26 114 #define SYM_ROOT_PATH 27 115 #define SYM_EXTEN_FILE 28 116 #define SYM_REPLY_ADDR 29 117 #define SYM_NIS_DOMAIN 30 /* RFC 1533 */ 118 #define SYM_NIS_SERVER 31 /* RFC 1533 */ 119 #define SYM_NTP_SERVER 32 /* RFC 1533 */ 120 #define SYM_EXEC_FILE 33 /* YORK_EX_OPTION */ 121 #define SYM_MSG_SIZE 34 122 #define SYM_MIN_WAIT 35 123 /* XXX - Add new tags here */ 124 125 #define OP_ADDITION 1 /* Operations on tags */ 126 #define OP_DELETION 2 127 #define OP_BOOLEAN 3 128 129 #define MAXINADDRS 16 /* Max size of an IP address list */ 130 #define MAXBUFLEN 256 /* Max temp buffer space */ 131 #define MAXENTRYLEN 2048 /* Max size of an entire entry */ 132 133 134 135 /* 136 * Structure used to map a configuration-file symbol (such as "ds") to a 137 * unique integer. 138 */ 139 140 struct symbolmap { 141 char *symbol; 142 int symbolcode; 143 }; 144 145 146 struct htypename { 147 char *name; 148 byte htype; 149 }; 150 151 152 PRIVATE int nhosts; /* Number of hosts (/w hw or IP address) */ 153 PRIVATE int nentries; /* Total number of entries */ 154 PRIVATE int32 modtime = 0; /* Last modification time of bootptab */ 155 PRIVATE char *current_hostname; /* Name of the current entry. */ 156 PRIVATE char current_tagname[8]; 157 158 /* 159 * List of symbolic names used in the bootptab file. The order and actual 160 * values of the symbol codes (SYM_. . .) are unimportant, but they must 161 * all be unique. 162 */ 163 164 PRIVATE struct symbolmap symbol_list[] = { 165 {"bf", SYM_BOOTFILE}, 166 {"bs", SYM_BOOTSIZE}, 167 {"cs", SYM_COOKIE_SERVER}, 168 {"df", SYM_DUMP_FILE}, 169 {"dn", SYM_DOMAIN_NAME}, 170 {"ds", SYM_DOMAIN_SERVER}, 171 {"ef", SYM_EXTEN_FILE}, 172 {"ex", SYM_EXEC_FILE}, /* YORK_EX_OPTION */ 173 {"gw", SYM_GATEWAY}, 174 {"ha", SYM_HWADDR}, 175 {"hd", SYM_HOMEDIR}, 176 {"hn", SYM_NAME_SWITCH}, 177 {"ht", SYM_HTYPE}, 178 {"im", SYM_IMPRESS_SERVER}, 179 {"ip", SYM_IPADDR}, 180 {"lg", SYM_LOG_SERVER}, 181 {"lp", SYM_LPR_SERVER}, 182 {"ms", SYM_MSG_SIZE}, 183 {"mw", SYM_MIN_WAIT}, 184 {"ns", SYM_NAME_SERVER}, 185 {"nt", SYM_NTP_SERVER}, 186 {"ra", SYM_REPLY_ADDR}, 187 {"rl", SYM_RLP_SERVER}, 188 {"rp", SYM_ROOT_PATH}, 189 {"sa", SYM_BOOT_SERVER}, 190 {"sm", SYM_SUBNET_MASK}, 191 {"sw", SYM_SWAP_SERVER}, 192 {"tc", SYM_SIMILAR_ENTRY}, 193 {"td", SYM_TFTPDIR}, 194 {"to", SYM_TIME_OFFSET}, 195 {"ts", SYM_TIME_SERVER}, 196 {"vm", SYM_VENDOR_MAGIC}, 197 {"yd", SYM_NIS_DOMAIN}, 198 {"ys", SYM_NIS_SERVER}, 199 /* XXX - Add new tags here */ 200 }; 201 202 203 /* 204 * List of symbolic names for hardware types. Name translates into 205 * hardware type code listed with it. Names must begin with a letter 206 * and must be all lowercase. This is searched linearly, so put 207 * commonly-used entries near the beginning. 208 */ 209 210 PRIVATE struct htypename htnamemap[] = { 211 {"ethernet", HTYPE_ETHERNET}, 212 {"ethernet3", HTYPE_EXP_ETHERNET}, 213 {"ether", HTYPE_ETHERNET}, 214 {"ether3", HTYPE_EXP_ETHERNET}, 215 {"ieee802", HTYPE_IEEE802}, 216 {"tr", HTYPE_IEEE802}, 217 {"token-ring", HTYPE_IEEE802}, 218 {"pronet", HTYPE_PRONET}, 219 {"chaos", HTYPE_CHAOS}, 220 {"arcnet", HTYPE_ARCNET}, 221 {"ax.25", HTYPE_AX25}, 222 {"direct", HTYPE_DIRECT}, 223 {"serial", HTYPE_DIRECT}, 224 {"slip", HTYPE_DIRECT}, 225 {"ppp", HTYPE_DIRECT} 226 }; 227 228 229 230 /* 231 * Externals and forward declarations. 232 */ 233 234 boolean nmcmp(hash_datum *, hash_datum *); 235 236 PRIVATE void 237 adjust(char **); 238 PRIVATE void 239 del_string(struct shared_string *); 240 PRIVATE void 241 del_bindata(struct shared_bindata *); 242 PRIVATE void 243 del_iplist(struct in_addr_list *); 244 PRIVATE void 245 eat_whitespace(char **); 246 PRIVATE int 247 eval_symbol(char **, struct host *); 248 PRIVATE void 249 fill_defaults(struct host *, char **); 250 PRIVATE void 251 free_host(hash_datum *); 252 PRIVATE struct in_addr_list * 253 get_addresses(char **); 254 PRIVATE struct shared_string * 255 get_shared_string(char **); 256 PRIVATE char * 257 get_string(char **, char *, u_int *); 258 PRIVATE u_int32 259 get_u_long(char **); 260 PRIVATE boolean 261 goodname(char *); 262 PRIVATE boolean 263 hwinscmp(hash_datum *, hash_datum *); 264 PRIVATE int 265 interp_byte(char **, byte *); 266 PRIVATE void 267 makelower(char *); 268 PRIVATE boolean 269 nullcmp(hash_datum *, hash_datum *); 270 PRIVATE int 271 process_entry(struct host *, char *); 272 PRIVATE int 273 process_generic(char **, struct shared_bindata **, u_int); 274 PRIVATE byte * 275 prs_haddr(char **, u_int); 276 PRIVATE int 277 prs_inetaddr(char **, u_int32 *); 278 PRIVATE void 279 read_entry(FILE *, char *, u_int *); 280 PRIVATE char * 281 smalloc(u_int); 282 283 284 285 /* 286 * Vendor magic cookies for CMU and RFC1048 287 */ 288 u_char vm_cmu[4] = VM_CMU; 289 u_char vm_rfc1048[4] = VM_RFC1048; 290 291 /* 292 * Main hash tables 293 */ 294 hash_tbl *hwhashtable; 295 hash_tbl *iphashtable; 296 hash_tbl *nmhashtable; 297 298 /* 299 * Allocate hash tables for hardware address, ip address, and hostname 300 * (shared by bootpd and bootpef) 301 */ 302 void 303 rdtab_init(void) 304 { 305 hwhashtable = hash_Init(HASHTABLESIZE); 306 iphashtable = hash_Init(HASHTABLESIZE); 307 nmhashtable = hash_Init(HASHTABLESIZE); 308 if (!(hwhashtable && iphashtable && nmhashtable)) { 309 report(LOG_ERR, "Unable to allocate hash tables."); 310 exit(1); 311 } 312 } 313 314 315 /* 316 * Read bootptab database file. Avoid rereading the file if the 317 * write date hasn't changed since the last time we read it. 318 */ 319 320 void 321 readtab(int force) 322 { 323 struct host *hp; 324 FILE *fp; 325 struct stat st; 326 unsigned hashcode, buflen; 327 static char buffer[MAXENTRYLEN]; 328 329 /* 330 * Check the last modification time. 331 */ 332 if (stat(bootptab, &st) < 0) { 333 report(LOG_ERR, "stat on \"%s\": %s", 334 bootptab, get_errmsg()); 335 return; 336 } 337 #ifdef DEBUG 338 if (debug > 3) { 339 char timestr[28]; 340 strcpy(timestr, ctime(&(st.st_mtime))); 341 /* zap the newline */ 342 timestr[24] = '\0'; 343 report(LOG_INFO, "bootptab mtime: %s", 344 timestr); 345 } 346 #endif 347 if ((force == 0) && 348 (st.st_mtime == modtime) && 349 st.st_nlink) { 350 /* 351 * hasn't been modified or deleted yet. 352 */ 353 return; 354 } 355 if (debug) 356 report(LOG_INFO, "reading %s\"%s\"", 357 (modtime != 0L) ? "new " : "", 358 bootptab); 359 360 /* 361 * Open bootptab file. 362 */ 363 if ((fp = fopen(bootptab, "r")) == NULL) { 364 report(LOG_ERR, "error opening \"%s\": %s", bootptab, get_errmsg()); 365 return; 366 } 367 /* 368 * Record file modification time. 369 */ 370 if (fstat(fileno(fp), &st) < 0) { 371 report(LOG_ERR, "fstat: %s", get_errmsg()); 372 fclose(fp); 373 return; 374 } 375 modtime = st.st_mtime; 376 377 /* 378 * Entirely erase all hash tables. 379 */ 380 hash_Reset(hwhashtable, free_host); 381 hash_Reset(iphashtable, free_host); 382 hash_Reset(nmhashtable, free_host); 383 384 nhosts = 0; 385 nentries = 0; 386 while (TRUE) { 387 buflen = sizeof(buffer); 388 read_entry(fp, buffer, &buflen); 389 if (buflen == 0) { /* More entries? */ 390 break; 391 } 392 hp = (struct host *) smalloc(sizeof(struct host)); 393 bzero((char *) hp, sizeof(*hp)); 394 /* the link count it zero */ 395 396 /* 397 * Get individual info 398 */ 399 if (process_entry(hp, buffer) < 0) { 400 hp->linkcount = 1; 401 free_host((hash_datum *) hp); 402 continue; 403 } 404 /* 405 * If this is not a dummy entry, and the IP or HW 406 * address is not yet set, try to get them here. 407 * Dummy entries have . as first char of name. 408 */ 409 if (goodname(hp->hostname->string)) { 410 char *hn = hp->hostname->string; 411 u_int32 value; 412 if (hp->flags.iaddr == 0) { 413 if (lookup_ipa(hn, &value)) { 414 report(LOG_ERR, "can not get IP addr for %s", hn); 415 report(LOG_ERR, "(dummy names should start with '.')"); 416 } else { 417 hp->iaddr.s_addr = value; 418 hp->flags.iaddr = TRUE; 419 } 420 } 421 /* Set default subnet mask. */ 422 if (hp->flags.subnet_mask == 0) { 423 if (lookup_netmask(hp->iaddr.s_addr, &value)) { 424 report(LOG_ERR, "can not get netmask for %s", hn); 425 } else { 426 hp->subnet_mask.s_addr = value; 427 hp->flags.subnet_mask = TRUE; 428 } 429 } 430 } 431 if (hp->flags.iaddr) { 432 nhosts++; 433 } 434 /* Register by HW addr if known. */ 435 if (hp->flags.htype && hp->flags.haddr) { 436 /* We will either insert it or free it. */ 437 hp->linkcount++; 438 hashcode = hash_HashFunction(hp->haddr, haddrlength(hp->htype)); 439 if (hash_Insert(hwhashtable, hashcode, hwinscmp, hp, hp) < 0) { 440 report(LOG_NOTICE, "duplicate %s address: %s", 441 netname(hp->htype), 442 haddrtoa(hp->haddr, haddrlength(hp->htype))); 443 free_host((hash_datum *) hp); 444 continue; 445 } 446 } 447 /* Register by IP addr if known. */ 448 if (hp->flags.iaddr) { 449 hashcode = hash_HashFunction((u_char *) & (hp->iaddr.s_addr), 4); 450 if (hash_Insert(iphashtable, hashcode, nullcmp, hp, hp) < 0) { 451 report(LOG_ERR, 452 "hash_Insert() failed on IP address insertion"); 453 } else { 454 /* Just inserted the host struct in a new hash list. */ 455 hp->linkcount++; 456 } 457 } 458 /* Register by Name (always known) */ 459 hashcode = hash_HashFunction((u_char *) hp->hostname->string, 460 strlen(hp->hostname->string)); 461 if (hash_Insert(nmhashtable, hashcode, nullcmp, 462 hp->hostname->string, hp) < 0) { 463 report(LOG_ERR, 464 "hash_Insert() failed on insertion of hostname: \"%s\"", 465 hp->hostname->string); 466 } else { 467 /* Just inserted the host struct in a new hash list. */ 468 hp->linkcount++; 469 } 470 471 nentries++; 472 } 473 474 fclose(fp); 475 if (debug) 476 report(LOG_INFO, "read %d entries (%d hosts) from \"%s\"", 477 nentries, nhosts, bootptab); 478 return; 479 } 480 481 482 483 /* 484 * Read an entire host entry from the file pointed to by "fp" and insert it 485 * into the memory pointed to by "buffer". Leading whitespace and comments 486 * starting with "#" are ignored (removed). Backslashes (\) always quote 487 * the next character except that newlines preceded by a backslash cause 488 * line-continuation onto the next line. The entry is terminated by a 489 * newline character which is not preceded by a backslash. Sequences 490 * surrounded by double quotes are taken literally (including newlines, but 491 * not backslashes). 492 * 493 * The "bufsiz" parameter points to an unsigned int which specifies the 494 * maximum permitted buffer size. Upon return, this value will be replaced 495 * with the actual length of the entry (not including the null terminator). 496 * 497 * This code is a little scary. . . . I don't like using gotos in C 498 * either, but I first wrote this as an FSM diagram and gotos seemed like 499 * the easiest way to implement it. Maybe later I'll clean it up. 500 */ 501 502 PRIVATE void 503 read_entry(FILE *fp, char *buffer, unsigned int *bufsiz) 504 { 505 int c, length; 506 507 length = 0; 508 509 /* 510 * Eat whitespace, blank lines, and comment lines. 511 */ 512 top: 513 c = fgetc(fp); 514 if (c < 0) { 515 goto done; /* Exit if end-of-file */ 516 } 517 if (isspace(c)) { 518 goto top; /* Skip over whitespace */ 519 } 520 if (c == '#') { 521 while (TRUE) { /* Eat comments after # */ 522 c = fgetc(fp); 523 if (c < 0) { 524 goto done; /* Exit if end-of-file */ 525 } 526 if (c == '\n') { 527 goto top; /* Try to read the next line */ 528 } 529 } 530 } 531 ungetc(c, fp); /* Other character, push it back to reprocess it */ 532 533 534 /* 535 * Now we're actually reading a data entry. Get each character and 536 * assemble it into the data buffer, processing special characters like 537 * double quotes (") and backslashes (\). 538 */ 539 540 mainloop: 541 c = fgetc(fp); 542 switch (c) { 543 case EOF: 544 case '\n': 545 goto done; /* Exit on EOF or newline */ 546 case '\\': 547 c = fgetc(fp); /* Backslash, read a new character */ 548 if (c < 0) { 549 goto done; /* Exit on EOF */ 550 } 551 *buffer++ = c; /* Store the literal character */ 552 length++; 553 if (length < *bufsiz - 1) { 554 goto mainloop; 555 } else { 556 goto done; 557 } 558 case '"': 559 *buffer++ = '"'; /* Store double-quote */ 560 length++; 561 if (length >= *bufsiz - 1) { 562 goto done; 563 } 564 while (TRUE) { /* Special quote processing loop */ 565 c = fgetc(fp); 566 switch (c) { 567 case EOF: 568 goto done; /* Exit on EOF . . . */ 569 case '"': 570 *buffer++ = '"';/* Store matching quote */ 571 length++; 572 if (length < *bufsiz - 1) { 573 goto mainloop; /* And continue main loop */ 574 } else { 575 goto done; 576 } 577 case '\\': 578 if ((c = fgetc(fp)) < 0) { /* Backslash */ 579 goto done; /* EOF. . . .*/ 580 } /* else fall through */ 581 default: 582 *buffer++ = c; /* Other character, store it */ 583 length++; 584 if (length >= *bufsiz - 1) { 585 goto done; 586 } 587 } 588 } 589 case ':': 590 *buffer++ = c; /* Store colons */ 591 length++; 592 if (length >= *bufsiz - 1) { 593 goto done; 594 } 595 do { /* But remove whitespace after them */ 596 c = fgetc(fp); 597 if ((c < 0) || (c == '\n')) { 598 goto done; 599 } 600 } while (isspace(c)); /* Skip whitespace */ 601 602 if (c == '\\') { /* Backslash quotes next character */ 603 c = fgetc(fp); 604 if (c < 0) { 605 goto done; 606 } 607 if (c == '\n') { 608 goto top; /* Backslash-newline continuation */ 609 } 610 } 611 /* fall through if "other" character */ 612 default: 613 *buffer++ = c; /* Store other characters */ 614 length++; 615 if (length >= *bufsiz - 1) { 616 goto done; 617 } 618 } 619 goto mainloop; /* Keep going */ 620 621 done: 622 *buffer = '\0'; /* Terminate string */ 623 *bufsiz = length; /* Tell the caller its length */ 624 } 625 626 627 628 /* 629 * Parse out all the various tags and parameters in the host entry pointed 630 * to by "src". Stuff all the data into the appropriate fields of the 631 * host structure pointed to by "host". If there is any problem with the 632 * entry, an error message is reported via report(), no further processing 633 * is done, and -1 is returned. Successful calls return 0. 634 * 635 * (Some errors probably shouldn't be so completely fatal. . . .) 636 */ 637 638 PRIVATE int 639 process_entry(struct host *host, char *src) 640 { 641 int retval; 642 char *msg; 643 644 if (!host || *src == '\0') { 645 return -1; 646 } 647 host->hostname = get_shared_string(&src); 648 #if 0 649 /* Be more liberal for the benefit of dummy tag names. */ 650 if (!goodname(host->hostname->string)) { 651 report(LOG_ERR, "bad hostname: \"%s\"", host->hostname->string); 652 del_string(host->hostname); 653 return -1; 654 } 655 #endif 656 current_hostname = host->hostname->string; 657 adjust(&src); 658 while (TRUE) { 659 retval = eval_symbol(&src, host); 660 if (retval == SUCCESS) { 661 adjust(&src); 662 continue; 663 } 664 if (retval == E_END_OF_ENTRY) { 665 /* The default subnet mask is set in readtab() */ 666 return 0; 667 } 668 /* Some kind of error. */ 669 switch (retval) { 670 case E_SYNTAX_ERROR: 671 msg = "bad syntax"; 672 break; 673 case E_UNKNOWN_SYMBOL: 674 msg = "unknown symbol"; 675 break; 676 case E_BAD_IPADDR: 677 msg = "bad INET address"; 678 break; 679 case E_BAD_HWADDR: 680 msg = "bad hardware address"; 681 break; 682 case E_BAD_LONGWORD: 683 msg = "bad longword value"; 684 break; 685 case E_BAD_HWATYPE: 686 msg = "bad HW address type"; 687 break; 688 case E_BAD_PATHNAME: 689 msg = "bad pathname (need leading '/')"; 690 case E_BAD_VALUE: 691 msg = "bad value"; 692 default: 693 msg = "unkown error"; 694 break; 695 } /* switch */ 696 report(LOG_ERR, "in entry named \"%s\", symbol \"%s\": %s", 697 current_hostname, current_tagname, msg); 698 return -1; 699 } 700 } 701 702 703 /* 704 * Macros for use in the function below: 705 */ 706 707 /* Parse one INET address stored directly in MEMBER. */ 708 #define PARSE_IA1(MEMBER) do \ 709 { \ 710 if (optype == OP_BOOLEAN) \ 711 return E_SYNTAX_ERROR; \ 712 hp->flags.MEMBER = FALSE; \ 713 if (optype == OP_ADDITION) { \ 714 if (prs_inetaddr(symbol, &value) < 0) \ 715 return E_BAD_IPADDR; \ 716 hp->MEMBER.s_addr = value; \ 717 hp->flags.MEMBER = TRUE; \ 718 } \ 719 } while (0) 720 721 /* Parse a list of INET addresses pointed to by MEMBER */ 722 #define PARSE_IAL(MEMBER) do \ 723 { \ 724 if (optype == OP_BOOLEAN) \ 725 return E_SYNTAX_ERROR; \ 726 if (hp->flags.MEMBER) { \ 727 hp->flags.MEMBER = FALSE; \ 728 assert(hp->MEMBER); \ 729 del_iplist(hp->MEMBER); \ 730 hp->MEMBER = NULL; \ 731 } \ 732 if (optype == OP_ADDITION) { \ 733 hp->MEMBER = get_addresses(symbol); \ 734 if (hp->MEMBER == NULL) \ 735 return E_SYNTAX_ERROR; \ 736 hp->flags.MEMBER = TRUE; \ 737 } \ 738 } while (0) 739 740 /* Parse a shared string pointed to by MEMBER */ 741 #define PARSE_STR(MEMBER) do \ 742 { \ 743 if (optype == OP_BOOLEAN) \ 744 return E_SYNTAX_ERROR; \ 745 if (hp->flags.MEMBER) { \ 746 hp->flags.MEMBER = FALSE; \ 747 assert(hp->MEMBER); \ 748 del_string(hp->MEMBER); \ 749 hp->MEMBER = NULL; \ 750 } \ 751 if (optype == OP_ADDITION) { \ 752 hp->MEMBER = get_shared_string(symbol); \ 753 if (hp->MEMBER == NULL) \ 754 return E_SYNTAX_ERROR; \ 755 hp->flags.MEMBER = TRUE; \ 756 } \ 757 } while (0) 758 759 /* Parse an integer value for MEMBER */ 760 #define PARSE_INT(MEMBER) do \ 761 { \ 762 if (optype == OP_BOOLEAN) \ 763 return E_SYNTAX_ERROR; \ 764 hp->flags.MEMBER = FALSE; \ 765 if (optype == OP_ADDITION) { \ 766 value = get_u_long(symbol); \ 767 hp->MEMBER = value; \ 768 hp->flags.MEMBER = TRUE; \ 769 } \ 770 } while (0) 771 772 /* 773 * Evaluate the two-character tag symbol pointed to by "symbol" and place 774 * the data in the structure pointed to by "hp". The pointer pointed to 775 * by "symbol" is updated to point past the source string (but may not 776 * point to the next tag entry). 777 * 778 * Obviously, this need a few more comments. . . . 779 */ 780 PRIVATE int 781 eval_symbol(char **symbol, struct host *hp) 782 { 783 char tmpstr[MAXSTRINGLEN]; 784 byte *tmphaddr; 785 struct symbolmap *symbolptr; 786 u_int32 value; 787 int32 timeoff; 788 int i, numsymbols; 789 unsigned len; 790 int optype; /* Indicates boolean, addition, or deletion */ 791 792 eat_whitespace(symbol); 793 794 /* Make sure this is set before returning. */ 795 current_tagname[0] = (*symbol)[0]; 796 current_tagname[1] = (*symbol)[1]; 797 current_tagname[2] = 0; 798 799 if ((*symbol)[0] == '\0') { 800 return E_END_OF_ENTRY; 801 } 802 if ((*symbol)[0] == ':') { 803 return SUCCESS; 804 } 805 if ((*symbol)[0] == 'T') { /* generic symbol */ 806 (*symbol)++; 807 value = get_u_long(symbol); 808 sprintf(current_tagname, "T%d", value); 809 eat_whitespace(symbol); 810 if ((*symbol)[0] != '=') { 811 return E_SYNTAX_ERROR; 812 } 813 (*symbol)++; 814 if (!(hp->generic)) { 815 hp->generic = (struct shared_bindata *) 816 smalloc(sizeof(struct shared_bindata)); 817 } 818 if (process_generic(symbol, &(hp->generic), (byte) (value & 0xFF))) 819 return E_SYNTAX_ERROR; 820 hp->flags.generic = TRUE; 821 return SUCCESS; 822 } 823 /* 824 * Determine the type of operation to be done on this symbol 825 */ 826 switch ((*symbol)[2]) { 827 case '=': 828 optype = OP_ADDITION; 829 break; 830 case '@': 831 optype = OP_DELETION; 832 break; 833 case ':': 834 case '\0': 835 optype = OP_BOOLEAN; 836 break; 837 default: 838 return E_SYNTAX_ERROR; 839 } 840 841 symbolptr = symbol_list; 842 numsymbols = sizeof(symbol_list) / sizeof(struct symbolmap); 843 for (i = 0; i < numsymbols; i++) { 844 if (((symbolptr->symbol)[0] == (*symbol)[0]) && 845 ((symbolptr->symbol)[1] == (*symbol)[1])) { 846 break; 847 } 848 symbolptr++; 849 } 850 if (i >= numsymbols) { 851 return E_UNKNOWN_SYMBOL; 852 } 853 /* 854 * Skip past the = or @ character (to point to the data) if this 855 * isn't a boolean operation. For boolean operations, just skip 856 * over the two-character tag symbol (and nothing else. . . .). 857 */ 858 (*symbol) += (optype == OP_BOOLEAN) ? 2 : 3; 859 860 eat_whitespace(symbol); 861 862 /* The cases below are in order by symbolcode value. */ 863 switch (symbolptr->symbolcode) { 864 865 case SYM_BOOTFILE: 866 PARSE_STR(bootfile); 867 break; 868 869 case SYM_COOKIE_SERVER: 870 PARSE_IAL(cookie_server); 871 break; 872 873 case SYM_DOMAIN_SERVER: 874 PARSE_IAL(domain_server); 875 break; 876 877 case SYM_GATEWAY: 878 PARSE_IAL(gateway); 879 break; 880 881 case SYM_HWADDR: 882 if (optype == OP_BOOLEAN) 883 return E_SYNTAX_ERROR; 884 hp->flags.haddr = FALSE; 885 if (optype == OP_ADDITION) { 886 /* Default the HW type to Ethernet */ 887 if (hp->flags.htype == 0) { 888 hp->flags.htype = TRUE; 889 hp->htype = HTYPE_ETHERNET; 890 } 891 tmphaddr = prs_haddr(symbol, hp->htype); 892 if (!tmphaddr) 893 return E_BAD_HWADDR; 894 bcopy(tmphaddr, hp->haddr, haddrlength(hp->htype)); 895 hp->flags.haddr = TRUE; 896 } 897 break; 898 899 case SYM_HOMEDIR: 900 PARSE_STR(homedir); 901 break; 902 903 case SYM_HTYPE: 904 if (optype == OP_BOOLEAN) 905 return E_SYNTAX_ERROR; 906 hp->flags.htype = FALSE; 907 if (optype == OP_ADDITION) { 908 value = 0L; /* Assume an illegal value */ 909 eat_whitespace(symbol); 910 if (isdigit(**symbol)) { 911 value = get_u_long(symbol); 912 } else { 913 len = sizeof(tmpstr); 914 (void) get_string(symbol, tmpstr, &len); 915 makelower(tmpstr); 916 numsymbols = sizeof(htnamemap) / 917 sizeof(struct htypename); 918 for (i = 0; i < numsymbols; i++) { 919 if (!strcmp(htnamemap[i].name, tmpstr)) { 920 break; 921 } 922 } 923 if (i < numsymbols) { 924 value = htnamemap[i].htype; 925 } 926 } 927 if (value >= hwinfocnt) { 928 return E_BAD_HWATYPE; 929 } 930 hp->htype = (byte) (value & 0xFF); 931 hp->flags.htype = TRUE; 932 } 933 break; 934 935 case SYM_IMPRESS_SERVER: 936 PARSE_IAL(impress_server); 937 break; 938 939 case SYM_IPADDR: 940 PARSE_IA1(iaddr); 941 break; 942 943 case SYM_LOG_SERVER: 944 PARSE_IAL(log_server); 945 break; 946 947 case SYM_LPR_SERVER: 948 PARSE_IAL(lpr_server); 949 break; 950 951 case SYM_NAME_SERVER: 952 PARSE_IAL(name_server); 953 break; 954 955 case SYM_RLP_SERVER: 956 PARSE_IAL(rlp_server); 957 break; 958 959 case SYM_SUBNET_MASK: 960 PARSE_IA1(subnet_mask); 961 break; 962 963 case SYM_TIME_OFFSET: 964 if (optype == OP_BOOLEAN) 965 return E_SYNTAX_ERROR; 966 hp->flags.time_offset = FALSE; 967 if (optype == OP_ADDITION) { 968 len = sizeof(tmpstr); 969 (void) get_string(symbol, tmpstr, &len); 970 if (!strncmp(tmpstr, "auto", 4)) { 971 hp->time_offset = secondswest; 972 } else { 973 if (sscanf(tmpstr, "%d", &timeoff) != 1) 974 return E_BAD_LONGWORD; 975 hp->time_offset = timeoff; 976 } 977 hp->flags.time_offset = TRUE; 978 } 979 break; 980 981 case SYM_TIME_SERVER: 982 PARSE_IAL(time_server); 983 break; 984 985 case SYM_VENDOR_MAGIC: 986 if (optype == OP_BOOLEAN) 987 return E_SYNTAX_ERROR; 988 hp->flags.vm_cookie = FALSE; 989 if (optype == OP_ADDITION) { 990 if (strncmp(*symbol, "auto", 4)) { 991 /* The string is not "auto" */ 992 if (!strncmp(*symbol, "rfc", 3)) { 993 bcopy(vm_rfc1048, hp->vm_cookie, 4); 994 } else if (!strncmp(*symbol, "cmu", 3)) { 995 bcopy(vm_cmu, hp->vm_cookie, 4); 996 } else { 997 if (!isdigit(**symbol)) 998 return E_BAD_IPADDR; 999 if (prs_inetaddr(symbol, &value) < 0) 1000 return E_BAD_IPADDR; 1001 bcopy(&value, hp->vm_cookie, 4); 1002 } 1003 hp->flags.vm_cookie = TRUE; 1004 } 1005 } 1006 break; 1007 1008 case SYM_SIMILAR_ENTRY: 1009 switch (optype) { 1010 case OP_ADDITION: 1011 fill_defaults(hp, symbol); 1012 break; 1013 default: 1014 return E_SYNTAX_ERROR; 1015 } 1016 break; 1017 1018 case SYM_NAME_SWITCH: 1019 switch (optype) { 1020 case OP_ADDITION: 1021 return E_SYNTAX_ERROR; 1022 case OP_DELETION: 1023 hp->flags.send_name = FALSE; 1024 hp->flags.name_switch = FALSE; 1025 break; 1026 case OP_BOOLEAN: 1027 hp->flags.send_name = TRUE; 1028 hp->flags.name_switch = TRUE; 1029 break; 1030 } 1031 break; 1032 1033 case SYM_BOOTSIZE: 1034 switch (optype) { 1035 case OP_ADDITION: 1036 if (!strncmp(*symbol, "auto", 4)) { 1037 hp->flags.bootsize = TRUE; 1038 hp->flags.bootsize_auto = TRUE; 1039 } else { 1040 hp->bootsize = (unsigned int) get_u_long(symbol); 1041 hp->flags.bootsize = TRUE; 1042 hp->flags.bootsize_auto = FALSE; 1043 } 1044 break; 1045 case OP_DELETION: 1046 hp->flags.bootsize = FALSE; 1047 break; 1048 case OP_BOOLEAN: 1049 hp->flags.bootsize = TRUE; 1050 hp->flags.bootsize_auto = TRUE; 1051 break; 1052 } 1053 break; 1054 1055 case SYM_BOOT_SERVER: 1056 PARSE_IA1(bootserver); 1057 break; 1058 1059 case SYM_TFTPDIR: 1060 PARSE_STR(tftpdir); 1061 if ((hp->tftpdir != NULL) && 1062 (hp->tftpdir->string[0] != '/')) 1063 return E_BAD_PATHNAME; 1064 break; 1065 1066 case SYM_DUMP_FILE: 1067 PARSE_STR(dump_file); 1068 break; 1069 1070 case SYM_DOMAIN_NAME: 1071 PARSE_STR(domain_name); 1072 break; 1073 1074 case SYM_SWAP_SERVER: 1075 PARSE_IA1(swap_server); 1076 break; 1077 1078 case SYM_ROOT_PATH: 1079 PARSE_STR(root_path); 1080 break; 1081 1082 case SYM_EXTEN_FILE: 1083 PARSE_STR(exten_file); 1084 break; 1085 1086 case SYM_REPLY_ADDR: 1087 PARSE_IA1(reply_addr); 1088 break; 1089 1090 case SYM_NIS_DOMAIN: 1091 PARSE_STR(nis_domain); 1092 break; 1093 1094 case SYM_NIS_SERVER: 1095 PARSE_IAL(nis_server); 1096 break; 1097 1098 case SYM_NTP_SERVER: 1099 PARSE_IAL(ntp_server); 1100 break; 1101 1102 #ifdef YORK_EX_OPTION 1103 case SYM_EXEC_FILE: 1104 PARSE_STR(exec_file); 1105 break; 1106 #endif 1107 1108 case SYM_MSG_SIZE: 1109 PARSE_INT(msg_size); 1110 if (hp->msg_size < BP_MINPKTSZ || 1111 hp->msg_size > MAX_MSG_SIZE) 1112 return E_BAD_VALUE; 1113 break; 1114 1115 case SYM_MIN_WAIT: 1116 PARSE_INT(min_wait); 1117 if (hp->min_wait < 0) 1118 return E_BAD_VALUE; 1119 break; 1120 1121 /* XXX - Add new tags here */ 1122 1123 default: 1124 return E_UNKNOWN_SYMBOL; 1125 1126 } /* switch symbolcode */ 1127 1128 return SUCCESS; 1129 } 1130 #undef PARSE_IA1 1131 #undef PARSE_IAL 1132 #undef PARSE_STR 1133 1134 1135 1136 1137 /* 1138 * Read a string from the buffer indirectly pointed to through "src" and 1139 * move it into the buffer pointed to by "dest". A pointer to the maximum 1140 * allowable length of the string (including null-terminator) is passed as 1141 * "length". The actual length of the string which was read is returned in 1142 * the unsigned integer pointed to by "length". This value is the same as 1143 * that which would be returned by applying the strlen() function on the 1144 * destination string (i.e the terminating null is not counted as a 1145 * character). Trailing whitespace is removed from the string. For 1146 * convenience, the function returns the new value of "dest". 1147 * 1148 * The string is read until the maximum number of characters, an unquoted 1149 * colon (:), or a null character is read. The return string in "dest" is 1150 * null-terminated. 1151 */ 1152 1153 PRIVATE char * 1154 get_string(char **src, char *dest, unsigned int *length) 1155 { 1156 int n, len, quoteflag; 1157 1158 quoteflag = FALSE; 1159 n = 0; 1160 len = *length - 1; 1161 while ((n < len) && (**src)) { 1162 if (!quoteflag && (**src == ':')) { 1163 break; 1164 } 1165 if (**src == '"') { 1166 (*src)++; 1167 quoteflag = !quoteflag; 1168 continue; 1169 } 1170 if (**src == '\\') { 1171 (*src)++; 1172 if (!**src) { 1173 break; 1174 } 1175 } 1176 *dest++ = *(*src)++; 1177 n++; 1178 } 1179 1180 /* 1181 * Remove that troublesome trailing whitespace. . . 1182 */ 1183 while ((n > 0) && isspace(dest[-1])) { 1184 dest--; 1185 n--; 1186 } 1187 1188 *dest = '\0'; 1189 *length = n; 1190 return dest; 1191 } 1192 1193 1194 1195 /* 1196 * Read the string indirectly pointed to by "src", update the caller's 1197 * pointer, and return a pointer to a malloc'ed shared_string structure 1198 * containing the string. 1199 * 1200 * The string is read using the same rules as get_string() above. 1201 */ 1202 1203 PRIVATE struct shared_string * 1204 get_shared_string(char **src) 1205 { 1206 char retstring[MAXSTRINGLEN]; 1207 struct shared_string *s; 1208 unsigned length; 1209 1210 length = sizeof(retstring); 1211 (void) get_string(src, retstring, &length); 1212 1213 s = (struct shared_string *) smalloc(sizeof(struct shared_string) 1214 + length); 1215 s->linkcount = 1; 1216 strcpy(s->string, retstring); 1217 1218 return s; 1219 } 1220 1221 1222 1223 /* 1224 * Load RFC1048 generic information directly into a memory buffer. 1225 * 1226 * "src" indirectly points to the ASCII representation of the generic data. 1227 * "dest" points to a string structure which is updated to point to a new 1228 * string with the new data appended to the old string. The old string is 1229 * freed. 1230 * 1231 * The given tag value is inserted with the new data. 1232 * 1233 * The data may be represented as either a stream of hexadecimal numbers 1234 * representing bytes (any or all bytes may optionally start with '0x' and 1235 * be separated with periods ".") or as a quoted string of ASCII 1236 * characters (the quotes are required). 1237 */ 1238 1239 PRIVATE int 1240 process_generic(char **src, struct shared_bindata **dest, u_int tagvalue) 1241 { 1242 byte tmpbuf[MAXBUFLEN]; 1243 byte *str; 1244 struct shared_bindata *bdata; 1245 u_int newlength, oldlength; 1246 1247 str = tmpbuf; 1248 *str++ = (tagvalue & 0xFF); /* Store tag value */ 1249 str++; /* Skip over length field */ 1250 if ((*src)[0] == '"') { /* ASCII data */ 1251 newlength = sizeof(tmpbuf) - 2; /* Set maximum allowed length */ 1252 (void) get_string(src, (char *) str, &newlength); 1253 /* Do NOT include the terminating null. */ 1254 } else { /* Numeric data */ 1255 newlength = 0; 1256 while (newlength < sizeof(tmpbuf) - 2) { 1257 if (interp_byte(src, str++) < 0) 1258 break; 1259 newlength++; 1260 if (**src == '.') { 1261 (*src)++; 1262 } 1263 } 1264 } 1265 if ((*src)[0] != ':') 1266 return -1; 1267 1268 tmpbuf[1] = (newlength & 0xFF); 1269 oldlength = ((*dest)->length); 1270 bdata = (struct shared_bindata *) smalloc(sizeof(struct shared_bindata) 1271 + oldlength + newlength + 1); 1272 if (oldlength > 0) { 1273 bcopy((*dest)->data, bdata->data, oldlength); 1274 } 1275 bcopy(tmpbuf, bdata->data + oldlength, newlength + 2); 1276 bdata->length = oldlength + newlength + 2; 1277 bdata->linkcount = 1; 1278 if (*dest) { 1279 del_bindata(*dest); 1280 } 1281 *dest = bdata; 1282 return 0; 1283 } 1284 1285 1286 1287 /* 1288 * Verify that the given string makes sense as a hostname (according to 1289 * Appendix 1, page 29 of RFC882). 1290 * 1291 * Return TRUE for good names, FALSE otherwise. 1292 */ 1293 1294 PRIVATE boolean 1295 goodname(char *hostname) 1296 { 1297 do { 1298 if (!isalpha(*hostname++)) { /* First character must be a letter */ 1299 return FALSE; 1300 } 1301 while (isalnum(*hostname) || 1302 (*hostname == '-') || 1303 (*hostname == '_') ) 1304 { 1305 hostname++; /* Alphanumeric or a hyphen */ 1306 } 1307 if (!isalnum(hostname[-1])) { /* Last must be alphanumeric */ 1308 return FALSE; 1309 } 1310 if (*hostname == '\0') {/* Done? */ 1311 return TRUE; 1312 } 1313 } while (*hostname++ == '.'); /* Dot, loop for next label */ 1314 1315 return FALSE; /* If it's not a dot, lose */ 1316 } 1317 1318 1319 1320 /* 1321 * Null compare function -- always returns FALSE so an element is always 1322 * inserted into a hash table (i.e. there is never a collision with an 1323 * existing element). 1324 */ 1325 1326 PRIVATE boolean 1327 nullcmp(hash_datum *d1, hash_datum *d2) 1328 { 1329 return FALSE; 1330 } 1331 1332 1333 /* 1334 * Function for comparing a string with the hostname field of a host 1335 * structure. 1336 */ 1337 1338 boolean 1339 nmcmp(hash_datum *d1, hash_datum *d2) 1340 { 1341 char *name = (char *) d1; /* XXX - OK? */ 1342 struct host *hp = (struct host *) d2; 1343 1344 return !strcmp(name, hp->hostname->string); 1345 } 1346 1347 1348 /* 1349 * Compare function to determine whether two hardware addresses are 1350 * equivalent. Returns TRUE if "host1" and "host2" are equivalent, FALSE 1351 * otherwise. 1352 * 1353 * If the hardware addresses of "host1" and "host2" are identical, but 1354 * they are on different IP subnets, this function returns FALSE. 1355 * 1356 * This function is used when inserting elements into the hardware address 1357 * hash table. 1358 */ 1359 1360 PRIVATE boolean 1361 hwinscmp(hash_datum *d1, hash_datum *d2) 1362 { 1363 struct host *host1 = (struct host *) d1; 1364 struct host *host2 = (struct host *) d2; 1365 1366 if (host1->htype != host2->htype) { 1367 return FALSE; 1368 } 1369 if (bcmp(host1->haddr, host2->haddr, haddrlength(host1->htype))) { 1370 return FALSE; 1371 } 1372 /* XXX - Is the subnet_mask field set yet? */ 1373 if ((host1->subnet_mask.s_addr) == (host2->subnet_mask.s_addr)) { 1374 if (((host1->iaddr.s_addr) & (host1->subnet_mask.s_addr)) != 1375 ((host2->iaddr.s_addr) & (host2->subnet_mask.s_addr))) 1376 { 1377 return FALSE; 1378 } 1379 } 1380 return TRUE; 1381 } 1382 1383 1384 /* 1385 * Macros for use in the function below: 1386 */ 1387 1388 #define DUP_COPY(MEMBER) do \ 1389 { \ 1390 if (!hp->flags.MEMBER) { \ 1391 if ((hp->flags.MEMBER = hp2->flags.MEMBER) != 0) { \ 1392 hp->MEMBER = hp2->MEMBER; \ 1393 } \ 1394 } \ 1395 } while (0) 1396 1397 #define DUP_LINK(MEMBER) do \ 1398 { \ 1399 if (!hp->flags.MEMBER) { \ 1400 if ((hp->flags.MEMBER = hp2->flags.MEMBER) != 0) { \ 1401 assert(hp2->MEMBER); \ 1402 hp->MEMBER = hp2->MEMBER; \ 1403 (hp->MEMBER->linkcount)++; \ 1404 } \ 1405 } \ 1406 } while (0) 1407 1408 /* 1409 * Process the "similar entry" symbol. 1410 * 1411 * The host specified as the value of the "tc" symbol is used as a template 1412 * for the current host entry. Symbol values not explicitly set in the 1413 * current host entry are inferred from the template entry. 1414 */ 1415 PRIVATE void 1416 fill_defaults(struct host *hp, char **src) 1417 { 1418 unsigned int tlen, hashcode; 1419 struct host *hp2; 1420 char tstring[MAXSTRINGLEN]; 1421 1422 tlen = sizeof(tstring); 1423 (void) get_string(src, tstring, &tlen); 1424 hashcode = hash_HashFunction((u_char *) tstring, tlen); 1425 hp2 = (struct host *) hash_Lookup(nmhashtable, hashcode, nmcmp, tstring); 1426 1427 if (hp2 == NULL) { 1428 report(LOG_ERR, "can't find tc=\"%s\"", tstring); 1429 return; 1430 } 1431 DUP_LINK(bootfile); 1432 DUP_LINK(cookie_server); 1433 DUP_LINK(domain_server); 1434 DUP_LINK(gateway); 1435 /* haddr not copied */ 1436 DUP_LINK(homedir); 1437 DUP_COPY(htype); 1438 1439 DUP_LINK(impress_server); 1440 /* iaddr not copied */ 1441 DUP_LINK(log_server); 1442 DUP_LINK(lpr_server); 1443 DUP_LINK(name_server); 1444 DUP_LINK(rlp_server); 1445 1446 DUP_COPY(subnet_mask); 1447 DUP_COPY(time_offset); 1448 DUP_LINK(time_server); 1449 1450 if (!hp->flags.vm_cookie) { 1451 if ((hp->flags.vm_cookie = hp2->flags.vm_cookie)) { 1452 bcopy(hp2->vm_cookie, hp->vm_cookie, 4); 1453 } 1454 } 1455 if (!hp->flags.name_switch) { 1456 if ((hp->flags.name_switch = hp2->flags.name_switch)) { 1457 hp->flags.send_name = hp2->flags.send_name; 1458 } 1459 } 1460 if (!hp->flags.bootsize) { 1461 if ((hp->flags.bootsize = hp2->flags.bootsize)) { 1462 hp->flags.bootsize_auto = hp2->flags.bootsize_auto; 1463 hp->bootsize = hp2->bootsize; 1464 } 1465 } 1466 DUP_COPY(bootserver); 1467 1468 DUP_LINK(tftpdir); 1469 DUP_LINK(dump_file); 1470 DUP_LINK(domain_name); 1471 1472 DUP_COPY(swap_server); 1473 DUP_LINK(root_path); 1474 DUP_LINK(exten_file); 1475 1476 DUP_COPY(reply_addr); 1477 1478 DUP_LINK(nis_domain); 1479 DUP_LINK(nis_server); 1480 DUP_LINK(ntp_server); 1481 1482 #ifdef YORK_EX_OPTION 1483 DUP_LINK(exec_file); 1484 #endif 1485 1486 DUP_COPY(msg_size); 1487 DUP_COPY(min_wait); 1488 1489 /* XXX - Add new tags here */ 1490 1491 DUP_LINK(generic); 1492 1493 } 1494 #undef DUP_COPY 1495 #undef DUP_LINK 1496 1497 1498 1499 /* 1500 * This function adjusts the caller's pointer to point just past the 1501 * first-encountered colon. If it runs into a null character, it leaves 1502 * the pointer pointing to it. 1503 */ 1504 1505 PRIVATE void 1506 adjust(char **s) 1507 { 1508 char *t; 1509 1510 t = *s; 1511 while (*t && (*t != ':')) { 1512 t++; 1513 } 1514 if (*t) { 1515 t++; 1516 } 1517 *s = t; 1518 } 1519 1520 1521 1522 1523 /* 1524 * This function adjusts the caller's pointer to point to the first 1525 * non-whitespace character. If it runs into a null character, it leaves 1526 * the pointer pointing to it. 1527 */ 1528 1529 PRIVATE void 1530 eat_whitespace(char **s) 1531 { 1532 char *t; 1533 1534 t = *s; 1535 while (*t && isspace(*t)) { 1536 t++; 1537 } 1538 *s = t; 1539 } 1540 1541 1542 1543 /* 1544 * This function converts the given string to all lowercase. 1545 */ 1546 1547 PRIVATE void 1548 makelower(char *s) 1549 { 1550 while (*s) { 1551 if (isupper(*s)) { 1552 *s = tolower(*s); 1553 } 1554 s++; 1555 } 1556 } 1557 1558 1559 1560 /* 1561 * 1562 * N O T E : 1563 * 1564 * In many of the functions which follow, a parameter such as "src" or 1565 * "symbol" is passed as a pointer to a pointer to something. This is 1566 * done for the purpose of letting the called function update the 1567 * caller's copy of the parameter (i.e. to effect call-by-reference 1568 * parameter passing). The value of the actual parameter is only used 1569 * to locate the real parameter of interest and then update this indirect 1570 * parameter. 1571 * 1572 * I'm sure somebody out there won't like this. . . . 1573 * (Yea, because it usually makes code slower... -gwr) 1574 * 1575 */ 1576 1577 1578 1579 /* 1580 * "src" points to a character pointer which points to an ASCII string of 1581 * whitespace-separated IP addresses. A pointer to an in_addr_list 1582 * structure containing the list of addresses is returned. NULL is 1583 * returned if no addresses were found at all. The pointer pointed to by 1584 * "src" is updated to point to the first non-address (illegal) character. 1585 */ 1586 1587 PRIVATE struct in_addr_list * 1588 get_addresses(char **src) 1589 { 1590 struct in_addr tmpaddrlist[MAXINADDRS]; 1591 struct in_addr *address1, *address2; 1592 struct in_addr_list *result; 1593 unsigned addrcount, totalsize; 1594 1595 address1 = tmpaddrlist; 1596 for (addrcount = 0; addrcount < MAXINADDRS; addrcount++) { 1597 while (isspace(**src) || (**src == ',')) { 1598 (*src)++; 1599 } 1600 if (!**src) { /* Quit if nothing more */ 1601 break; 1602 } 1603 if (prs_inetaddr(src, &(address1->s_addr)) < 0) { 1604 break; 1605 } 1606 address1++; /* Point to next address slot */ 1607 } 1608 if (addrcount < 1) { 1609 result = NULL; 1610 } else { 1611 totalsize = sizeof(struct in_addr_list) 1612 + (addrcount - 1) * sizeof(struct in_addr); 1613 result = (struct in_addr_list *) smalloc(totalsize); 1614 result->linkcount = 1; 1615 result->addrcount = addrcount; 1616 address1 = tmpaddrlist; 1617 address2 = result->addr; 1618 for (; addrcount > 0; addrcount--) { 1619 address2->s_addr = address1->s_addr; 1620 address1++; 1621 address2++; 1622 } 1623 } 1624 return result; 1625 } 1626 1627 1628 1629 /* 1630 * prs_inetaddr(src, result) 1631 * 1632 * "src" is a value-result parameter; the pointer it points to is updated 1633 * to point to the next data position. "result" points to an unsigned long 1634 * in which an address is returned. 1635 * 1636 * This function parses the IP address string in ASCII "dot notation" pointed 1637 * to by (*src) and places the result (in network byte order) in the unsigned 1638 * long pointed to by "result". For malformed addresses, -1 is returned, 1639 * (*src) points to the first illegal character, and the unsigned long pointed 1640 * to by "result" is unchanged. Successful calls return 0. 1641 */ 1642 1643 PRIVATE int 1644 prs_inetaddr(char **src, u_int32 *result) 1645 { 1646 char tmpstr[MAXSTRINGLEN]; 1647 u_int32 value; 1648 u_int32 parts[4], *pp; 1649 int n; 1650 char *s, *t; 1651 1652 #if 1 /* XXX - experimental */ 1653 /* Leading alpha char causes IP addr lookup. */ 1654 if (isalpha(**src)) { 1655 /* Lookup IP address. */ 1656 s = *src; 1657 t = tmpstr; 1658 while ((isalnum(*s) || (*s == '.') || 1659 (*s == '-') || (*s == '_') ) && 1660 (t < &tmpstr[MAXSTRINGLEN - 1]) ) 1661 *t++ = *s++; 1662 *t = '\0'; 1663 *src = s; 1664 1665 n = lookup_ipa(tmpstr, result); 1666 if (n < 0) 1667 report(LOG_ERR, "can not get IP addr for %s", tmpstr); 1668 return n; 1669 } 1670 #endif 1671 1672 /* 1673 * Parse an address in Internet format: 1674 * a.b.c.d 1675 * a.b.c (with c treated as 16-bits) 1676 * a.b (with b treated as 24 bits) 1677 */ 1678 pp = parts; 1679 loop: 1680 /* If it's not a digit, return error. */ 1681 if (!isdigit(**src)) 1682 return -1; 1683 *pp++ = get_u_long(src); 1684 if (**src == '.') { 1685 if (pp < (parts + 4)) { 1686 (*src)++; 1687 goto loop; 1688 } 1689 return (-1); 1690 } 1691 #if 0 1692 /* This is handled by the caller. */ 1693 if (**src && !(isspace(**src) || (**src == ':'))) { 1694 return (-1); 1695 } 1696 #endif 1697 1698 /* 1699 * Construct the address according to 1700 * the number of parts specified. 1701 */ 1702 n = pp - parts; 1703 switch (n) { 1704 case 1: /* a -- 32 bits */ 1705 value = parts[0]; 1706 break; 1707 case 2: /* a.b -- 8.24 bits */ 1708 value = (parts[0] << 24) | (parts[1] & 0xFFFFFF); 1709 break; 1710 case 3: /* a.b.c -- 8.8.16 bits */ 1711 value = (parts[0] << 24) | ((parts[1] & 0xFF) << 16) | 1712 (parts[2] & 0xFFFF); 1713 break; 1714 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 1715 value = (parts[0] << 24) | ((parts[1] & 0xFF) << 16) | 1716 ((parts[2] & 0xFF) << 8) | (parts[3] & 0xFF); 1717 break; 1718 default: 1719 return (-1); 1720 } 1721 *result = htonl(value); 1722 return (0); 1723 } 1724 1725 1726 1727 /* 1728 * "src" points to a pointer which in turn points to a hexadecimal ASCII 1729 * string. This string is interpreted as a hardware address and returned 1730 * as a pointer to the actual hardware address, represented as an array of 1731 * bytes. 1732 * 1733 * The ASCII string must have the proper number of digits for the specified 1734 * hardware type (e.g. twelve digits for a 48-bit Ethernet address). 1735 * Two-digit sequences (bytes) may be separated with periods (.) and/or 1736 * prefixed with '0x' for readability, but this is not required. 1737 * 1738 * For bad addresses, the pointer which "src" points to is updated to point 1739 * to the start of the first two-digit sequence which was bad, and the 1740 * function returns a NULL pointer. 1741 */ 1742 1743 PRIVATE byte * 1744 prs_haddr(char **src, u_int htype) 1745 { 1746 static byte haddr[MAXHADDRLEN]; 1747 byte *hap; 1748 char tmpstr[MAXSTRINGLEN]; 1749 u_int tmplen; 1750 unsigned hal; 1751 char *p; 1752 1753 hal = haddrlength(htype); /* Get length of this address type */ 1754 if (hal <= 0) { 1755 report(LOG_ERR, "Invalid addr type for HW addr parse"); 1756 return NULL; 1757 } 1758 tmplen = sizeof(tmpstr); 1759 get_string(src, tmpstr, &tmplen); 1760 p = tmpstr; 1761 1762 #if 1 /* XXX - experimental */ 1763 /* If it's a valid host name, try to lookup the HW address. */ 1764 if (goodname(p)) { 1765 /* Lookup Hardware Address for hostname. */ 1766 if ((hap = lookup_hwa(p, htype)) != NULL) 1767 return hap; /* success */ 1768 report(LOG_ERR, "Add 0x prefix if hex value starts with A-F"); 1769 /* OK, assume it must be numeric. */ 1770 } 1771 #endif 1772 1773 hap = haddr; 1774 while (hap < haddr + hal) { 1775 if ((*p == '.') || (*p == ':')) 1776 p++; 1777 if (interp_byte(&p, hap++) < 0) { 1778 return NULL; 1779 } 1780 } 1781 return haddr; 1782 } 1783 1784 1785 1786 /* 1787 * "src" is a pointer to a character pointer which in turn points to a 1788 * hexadecimal ASCII representation of a byte. This byte is read, the 1789 * character pointer is updated, and the result is deposited into the 1790 * byte pointed to by "retbyte". 1791 * 1792 * The usual '0x' notation is allowed but not required. The number must be 1793 * a two digit hexadecimal number. If the number is invalid, "src" and 1794 * "retbyte" are left untouched and -1 is returned as the function value. 1795 * Successful calls return 0. 1796 */ 1797 1798 PRIVATE int 1799 interp_byte(char **src, byte *retbyte) 1800 { 1801 int v; 1802 1803 if ((*src)[0] == '0' && 1804 ((*src)[1] == 'x' || 1805 (*src)[1] == 'X')) { 1806 (*src) += 2; /* allow 0x for hex, but don't require it */ 1807 } 1808 if (!isxdigit((*src)[0]) || !isxdigit((*src)[1])) { 1809 return -1; 1810 } 1811 if (sscanf(*src, "%2x", &v) != 1) { 1812 return -1; 1813 } 1814 (*src) += 2; 1815 *retbyte = (byte) (v & 0xFF); 1816 return 0; 1817 } 1818 1819 1820 1821 /* 1822 * The parameter "src" points to a character pointer which points to an 1823 * ASCII string representation of an unsigned number. The number is 1824 * returned as an unsigned long and the character pointer is updated to 1825 * point to the first illegal character. 1826 */ 1827 1828 PRIVATE u_int32 1829 get_u_long(char **src) 1830 { 1831 u_int32 value, base; 1832 char c; 1833 1834 /* 1835 * Collect number up to first illegal character. Values are specified 1836 * as for C: 0x=hex, 0=octal, other=decimal. 1837 */ 1838 value = 0; 1839 base = 10; 1840 if (**src == '0') { 1841 base = 8; 1842 (*src)++; 1843 } 1844 if (**src == 'x' || **src == 'X') { 1845 base = 16; 1846 (*src)++; 1847 } 1848 while ((c = **src)) { 1849 if (isdigit(c)) { 1850 value = (value * base) + (c - '0'); 1851 (*src)++; 1852 continue; 1853 } 1854 if (base == 16 && isxdigit(c)) { 1855 value = (value << 4) + ((c & ~32) + 10 - 'A'); 1856 (*src)++; 1857 continue; 1858 } 1859 break; 1860 } 1861 return value; 1862 } 1863 1864 1865 1866 /* 1867 * Routines for deletion of data associated with the main data structure. 1868 */ 1869 1870 1871 /* 1872 * Frees the entire host data structure given. Does nothing if the passed 1873 * pointer is NULL. 1874 */ 1875 1876 PRIVATE void 1877 free_host(hash_datum *hmp) 1878 { 1879 struct host *hostptr = (struct host *) hmp; 1880 if (hostptr == NULL) 1881 return; 1882 assert(hostptr->linkcount > 0); 1883 if (--(hostptr->linkcount)) 1884 return; /* Still has references */ 1885 del_iplist(hostptr->cookie_server); 1886 del_iplist(hostptr->domain_server); 1887 del_iplist(hostptr->gateway); 1888 del_iplist(hostptr->impress_server); 1889 del_iplist(hostptr->log_server); 1890 del_iplist(hostptr->lpr_server); 1891 del_iplist(hostptr->name_server); 1892 del_iplist(hostptr->rlp_server); 1893 del_iplist(hostptr->time_server); 1894 del_iplist(hostptr->nis_server); 1895 del_iplist(hostptr->ntp_server); 1896 1897 /* 1898 * XXX - Add new tags here 1899 * (if the value is an IP list) 1900 */ 1901 1902 del_string(hostptr->hostname); 1903 del_string(hostptr->homedir); 1904 del_string(hostptr->bootfile); 1905 del_string(hostptr->tftpdir); 1906 del_string(hostptr->root_path); 1907 del_string(hostptr->domain_name); 1908 del_string(hostptr->dump_file); 1909 del_string(hostptr->exten_file); 1910 del_string(hostptr->nis_domain); 1911 1912 #ifdef YORK_EX_OPTION 1913 del_string(hostptr->exec_file); 1914 #endif 1915 1916 /* 1917 * XXX - Add new tags here 1918 * (if it is a shared string) 1919 */ 1920 1921 del_bindata(hostptr->generic); 1922 free((char *) hostptr); 1923 } 1924 1925 1926 1927 /* 1928 * Decrements the linkcount on the given IP address data structure. If the 1929 * linkcount goes to zero, the memory associated with the data is freed. 1930 */ 1931 1932 PRIVATE void 1933 del_iplist(struct in_addr_list *iplist) 1934 { 1935 if (iplist) { 1936 if (!(--(iplist->linkcount))) { 1937 free((char *) iplist); 1938 } 1939 } 1940 } 1941 1942 1943 1944 /* 1945 * Decrements the linkcount on a string data structure. If the count 1946 * goes to zero, the memory associated with the string is freed. Does 1947 * nothing if the passed pointer is NULL. 1948 */ 1949 1950 PRIVATE void 1951 del_string(struct shared_string *stringptr) 1952 { 1953 if (stringptr) { 1954 if (!(--(stringptr->linkcount))) { 1955 free((char *) stringptr); 1956 } 1957 } 1958 } 1959 1960 1961 1962 /* 1963 * Decrements the linkcount on a shared_bindata data structure. If the 1964 * count goes to zero, the memory associated with the data is freed. Does 1965 * nothing if the passed pointer is NULL. 1966 */ 1967 1968 PRIVATE void 1969 del_bindata(struct shared_bindata *dataptr) 1970 { 1971 if (dataptr) { 1972 if (!(--(dataptr->linkcount))) { 1973 free((char *) dataptr); 1974 } 1975 } 1976 } 1977 1978 1979 1980 1981 /* smalloc() -- safe malloc() 1982 * 1983 * Always returns a valid pointer (if it returns at all). The allocated 1984 * memory is initialized to all zeros. If malloc() returns an error, a 1985 * message is printed using the report() function and the program aborts 1986 * with a status of 1. 1987 */ 1988 1989 PRIVATE char * 1990 smalloc(unsigned int nbytes) 1991 { 1992 char *retvalue; 1993 1994 retvalue = malloc(nbytes); 1995 if (!retvalue) { 1996 report(LOG_ERR, "malloc() failure -- exiting"); 1997 exit(1); 1998 } 1999 bzero(retvalue, nbytes); 2000 return retvalue; 2001 } 2002 2003 2004 /* 2005 * Compare function to determine whether two hardware addresses are 2006 * equivalent. Returns TRUE if "host1" and "host2" are equivalent, FALSE 2007 * otherwise. 2008 * 2009 * This function is used when retrieving elements from the hardware address 2010 * hash table. 2011 */ 2012 2013 boolean 2014 hwlookcmp(hash_datum *d1, hash_datum *d2) 2015 { 2016 struct host *host1 = (struct host *) d1; 2017 struct host *host2 = (struct host *) d2; 2018 2019 if (host1->htype != host2->htype) { 2020 return FALSE; 2021 } 2022 if (bcmp(host1->haddr, host2->haddr, haddrlength(host1->htype))) { 2023 return FALSE; 2024 } 2025 return TRUE; 2026 } 2027 2028 2029 /* 2030 * Compare function for doing IP address hash table lookup. 2031 */ 2032 2033 boolean 2034 iplookcmp(hash_datum *d1, hash_datum *d2) 2035 { 2036 struct host *host1 = (struct host *) d1; 2037 struct host *host2 = (struct host *) d2; 2038 2039 return (host1->iaddr.s_addr == host2->iaddr.s_addr); 2040 } 2041 2042 /* 2043 * Local Variables: 2044 * tab-width: 4 2045 * c-indent-level: 4 2046 * c-argdecl-indent: 4 2047 * c-continued-statement-offset: 4 2048 * c-continued-brace-offset: -4 2049 * c-label-offset: -4 2050 * c-brace-offset: 0 2051 * End: 2052 */ 2053