contrib/dhcp-3.0/common/conflex.c

   1 /* conflex.c
   2
   3    Lexical scanner for dhcpd config file... */
   4
   5 /*
   6  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 1995-2003 by Internet Software Consortium
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  19  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  *
  21  *   Internet Systems Consortium, Inc.
  22  *   950 Charter Street
  23  *   Redwood City, CA 94063
  24  *   <info@isc.org>
  25  *   http://www.isc.org/
  26  *
  27  * This software has been written for Internet Systems Consortium
  28  * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
  29  * To learn more about Internet Systems Consortium, see
  30  * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
  31  * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
  32  * ``http://www.nominum.com''.
  33  */
  34
  35 #ifndef lint
  36 static char copyright[] =
  37 "$Id: conflex.c,v 1.92.2.9 2004/11/24 17:39:15 dhankins Exp $ Copyright (c) 2004 Internet Systems Consortium.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #include "dhcpd.h"
  41 #include <ctype.h>
  42
  43 static int get_char PROTO ((struct parse *));
  44 static enum dhcp_token get_token PROTO ((struct parse *));
  45 static void skip_to_eol PROTO ((struct parse *));
  46 static enum dhcp_token read_string PROTO ((struct parse *));
  47 static enum dhcp_token read_number PROTO ((int, struct parse *));
  48 static enum dhcp_token read_num_or_name PROTO ((int, struct parse *));
  49 static enum dhcp_token intern PROTO ((char *, enum dhcp_token));
  50
  51 isc_result_t new_parse (cfile, file, inbuf, buflen, name, eolp)
  52         struct parse **cfile;
  53         int file;
  54         char *inbuf;
  55         unsigned buflen;
  56         const char *name;
  57         int eolp;
  58 {
  59         struct parse *tmp;
  60
  61         tmp = dmalloc (sizeof (struct parse), MDL);
  62         if (!tmp)
  63                 return ISC_R_NOMEMORY;
  64         memset (tmp, 0, sizeof *tmp);
  65
  66         tmp -> token = 0;
  67         tmp -> tlname = name;
  68         tmp -> lpos = tmp -> line = 1;
  69         tmp -> cur_line = tmp -> line1;
  70         tmp -> prev_line = tmp -> line2;
  71         tmp -> token_line = tmp -> cur_line;
  72         tmp -> cur_line [0] = tmp -> prev_line [0] = 0;
  73         tmp -> warnings_occurred = 0;
  74         tmp -> file = file;
  75         tmp -> eol_token = eolp;
  76
  77         tmp -> bufix = 0;
  78         tmp -> buflen = buflen;
  79         if (inbuf) {
  80                 tmp -> bufsiz = 0;
  81                 tmp -> inbuf = inbuf;
  82         } else {
  83                 tmp -> inbuf = dmalloc (8192, MDL);
  84                 if (!tmp -> inbuf) {
  85                         dfree (tmp, MDL);
  86                         return ISC_R_NOMEMORY;
  87                 }
  88                 tmp -> bufsiz = 8192;
  89         }
  90
  91         *cfile = tmp;
  92         return ISC_R_SUCCESS;
  93 }
  94
  95 isc_result_t end_parse (cfile)
  96         struct parse **cfile;
  97 {
  98         if ((*cfile) -> bufsiz)
  99                 dfree ((*cfile) -> inbuf, MDL);
 100         dfree (*cfile, MDL);
 101         *cfile = (struct parse *)0;
 102         return ISC_R_SUCCESS;
 103 }
 104
 105 static int get_char (cfile)
 106         struct parse *cfile;
 107 {
 108         /* My kingdom for WITH... */
 109         int c;
 110
 111         if (cfile -> bufix == cfile -> buflen) {
 112                 if (cfile -> file != -1) {
 113                         cfile -> buflen =
 114                                 read (cfile -> file,
 115                                       cfile -> inbuf, cfile -> bufsiz);
 116                         if (cfile -> buflen == 0) {
 117                                 c = EOF;
 118                                 cfile -> bufix = 0;
 119                         } else if (cfile -> buflen < 0) {
 120                                 c = EOF;
 121                                 cfile -> bufix = cfile -> buflen = 0;
 122                         } else {
 123                                 c = cfile -> inbuf [0];
 124                                 cfile -> bufix = 1;
 125                         }
 126                 } else
 127                         c = EOF;
 128         } else {
 129                 c = cfile -> inbuf [cfile -> bufix];
 130                 cfile -> bufix++;
 131         }
 132
 133         if (!cfile -> ugflag) {
 134                 if (c == EOL) {
 135                         if (cfile -> cur_line == cfile -> line1) {
 136                                 cfile -> cur_line = cfile -> line2;
 137                                 cfile -> prev_line = cfile -> line1;
 138                         } else {
 139                                 cfile -> cur_line = cfile -> line1;
 140                                 cfile -> prev_line = cfile -> line2;
 141                         }
 142                         cfile -> line++;
 143                         cfile -> lpos = 1;
 144                         cfile -> cur_line [0] = 0;
 145                 } else if (c != EOF) {
 146                         if (cfile -> lpos <= 80) {
 147                                 cfile -> cur_line [cfile -> lpos - 1] = c;
 148                                 cfile -> cur_line [cfile -> lpos] = 0;
 149                         }
 150                         cfile -> lpos++;
 151                 }
 152         } else
 153                 cfile -> ugflag = 0;
 154         return c;
 155 }
 156
 157 static enum dhcp_token get_token (cfile)
 158         struct parse *cfile;
 159 {
 160         int c;
 161         enum dhcp_token ttok;
 162         static char tb [2];
 163         int l, p, u;
 164
 165         do {
 166                 l = cfile -> line;
 167                 p = cfile -> lpos;
 168                 u = cfile -> ugflag;
 169
 170                 c = get_char (cfile);
 171 #ifdef OLD_LEXER
 172                 if (c == '\n' && p == 1 && !u
 173                     && cfile -> comment_index < sizeof cfile -> comments)
 174                         cfile -> comments [cfile -> comment_index++] = '\n';
 175 #endif
 176
 177                 if (!(c == '\n' && cfile -> eol_token)
 178                     && isascii (c) && isspace (c))
 179                         continue;
 180                 if (c == '#') {
 181 #ifdef OLD_LEXER
 182                         if (cfile -> comment_index < sizeof cfile -> comments)
 183                             cfile -> comments [cfile -> comment_index++] = '#';
 184 #endif
 185                         skip_to_eol (cfile);
 186                         continue;
 187                 }
 188                 if (c == '"') {
 189                         cfile -> lexline = l;
 190                         cfile -> lexchar = p;
 191                         ttok = read_string (cfile);
 192                         break;
 193                 }
 194                 if ((isascii (c) && isdigit (c)) || c == '-') {
 195                         cfile -> lexline = l;
 196                         cfile -> lexchar = p;
 197                         ttok = read_number (c, cfile);
 198                         break;
 199                 } else if (isascii (c) && isalpha (c)) {
 200                         cfile -> lexline = l;
 201                         cfile -> lexchar = p;
 202                         ttok = read_num_or_name (c, cfile);
 203                         break;
 204                 } else if (c == EOF) {
 205                         ttok = END_OF_FILE;
 206                         cfile -> tlen = 0;
 207                         break;
 208                 } else {
 209                         cfile -> lexline = l;
 210                         cfile -> lexchar = p;
 211                         tb [0] = c;
 212                         tb [1] = 0;
 213                         cfile -> tval = tb;
 214                         cfile -> tlen = 1;
 215                         ttok = c;
 216                         break;
 217                 }
 218         } while (1);
 219         return ttok;
 220 }
 221
 222 enum dhcp_token next_token (rval, rlen, cfile)
 223         const char **rval;
 224         unsigned *rlen;
 225         struct parse *cfile;
 226 {
 227         int rv;
 228
 229         if (cfile -> token) {
 230                 if (cfile -> lexline != cfile -> tline)
 231                         cfile -> token_line = cfile -> cur_line;
 232                 cfile -> lexchar = cfile -> tlpos;
 233                 cfile -> lexline = cfile -> tline;
 234                 rv = cfile -> token;
 235                 cfile -> token = 0;
 236         } else {
 237                 rv = get_token (cfile);
 238                 cfile -> token_line = cfile -> cur_line;
 239         }
 240         if (rval)
 241                 *rval = cfile -> tval;
 242         if (rlen)
 243                 *rlen = cfile -> tlen;
 244 #ifdef DEBUG_TOKENS
 245         fprintf (stderr, "%s:%d ", cfile -> tval, rv);
 246 #endif
 247         return rv;
 248 }
 249
 250 enum dhcp_token peek_token (rval, rlen, cfile)
 251         const char **rval;
 252         unsigned int *rlen;
 253         struct parse *cfile;
 254 {
 255         int x;
 256
 257         if (!cfile -> token) {
 258                 cfile -> tlpos = cfile -> lexchar;
 259                 cfile -> tline = cfile -> lexline;
 260                 cfile -> token = get_token (cfile);
 261                 if (cfile -> lexline != cfile -> tline)
 262                         cfile -> token_line = cfile -> prev_line;
 263
 264                 x = cfile -> lexchar;
 265                 cfile -> lexchar = cfile -> tlpos;
 266                 cfile -> tlpos = x;
 267
 268                 x = cfile -> lexline;
 269                 cfile -> lexline = cfile -> tline;
 270                 cfile -> tline = x;
 271         }
 272         if (rval)
 273                 *rval = cfile -> tval;
 274         if (rlen)
 275                 *rlen = cfile -> tlen;
 276 #ifdef DEBUG_TOKENS
 277         fprintf (stderr, "(%s:%d) ", cfile -> tval, cfile -> token);
 278 #endif
 279         return cfile -> token;
 280 }
 281
 282 static void skip_to_eol (cfile)
 283         struct parse *cfile;
 284 {
 285         int c;
 286         do {
 287                 c = get_char (cfile);
 288                 if (c == EOF)
 289                         return;
 290 #ifdef OLD_LEXER
 291                 if (cfile -> comment_index < sizeof (cfile -> comments))
 292                         comments [cfile -> comment_index++] = c;
 293 #endif
 294                 if (c == EOL) {
 295                         return;
 296                 }
 297         } while (1);
 298 }
 299
 300 static enum dhcp_token read_string (cfile)
 301         struct parse *cfile;
 302 {
 303         int i;
 304         int bs = 0;
 305         int c;
 306         int value = 0;
 307         int hex = 0;
 308
 309         for (i = 0; i < sizeof cfile -> tokbuf; i++) {
 310               again:
 311                 c = get_char (cfile);
 312                 if (c == EOF) {
 313                         parse_warn (cfile, "eof in string constant");
 314                         break;
 315                 }
 316                 if (bs == 1) {
 317                         switch (c) {
 318                               case 't':
 319                                 cfile -> tokbuf [i] = '\t';
 320                                 break;
 321                               case 'r':
 322                                 cfile -> tokbuf [i] = '\r';
 323                                 break;
 324                               case 'n':
 325                                 cfile -> tokbuf [i] = '\n';
 326                                 break;
 327                               case 'b':
 328                                 cfile -> tokbuf [i] = '\b';
 329                                 break;
 330                               case '0':
 331                               case '1':
 332                               case '2':
 333                               case '3':
 334                                 hex = 0;
 335                                 value = c - '0';
 336                                 ++bs;
 337                                 goto again;
 338                               case 'x':
 339                                 hex = 1;
 340                                 value = 0;
 341                                 ++bs;
 342                                 goto again;
 343                               default:
 344                                 cfile -> tokbuf [i] = c;
 345                                 bs = 0;
 346                                 break;
 347                         }
 348                         bs = 0;
 349                 } else if (bs > 1) {
 350                         if (hex) {
 351                                 if (c >= '0' && c <= '9') {
 352                                         value = value * 16 + (c - '0');
 353                                 } else if (c >= 'a' && c <= 'f') {
 354                                         value = value * 16 + (c - 'a' + 10);
 355                                 } else if (c >= 'A' && c <= 'F') {
 356                                         value = value * 16 + (c - 'A' + 10);
 357                                 } else {
 358                                         parse_warn (cfile,
 359                                                     "invalid hex digit: %x",
 360                                                     c);
 361                                         bs = 0;
 362                                         continue;
 363                                 }
 364                                 if (++bs == 4) {
 365                                         cfile -> tokbuf [i] = value;
 366                                         bs = 0;
 367                                 } else
 368                                         goto again;
 369                         } else {
 370                                 if (c >= '0' && c <= '9') {
 371                                         value = value * 8 + (c - '0');
 372                                 } else {
 373                                     if (value != 0) {
 374                                         parse_warn (cfile,
 375                                                     "invalid octal digit %x",
 376                                                     c);
 377                                         continue;
 378                                     } else
 379                                         cfile -> tokbuf [i] = 0;
 380                                     bs = 0;
 381                                 }
 382                                 if (++bs == 4) {
 383                                         cfile -> tokbuf [i] = value;
 384                                         bs = 0;
 385                                 } else
 386                                         goto again;
 387                         }
 388                 } else if (c == '\\') {
 389                         bs = 1;
 390                         goto again;
 391                 } else if (c == '"')
 392                         break;
 393                 else
 394                         cfile -> tokbuf [i] = c;
 395         }
 396         /* Normally, I'd feel guilty about this, but we're talking about
 397            strings that'll fit in a DHCP packet here... */
 398         if (i == sizeof cfile -> tokbuf) {
 399                 parse_warn (cfile,
 400                             "string constant larger than internal buffer");
 401                 --i;
 402         }
 403         cfile -> tokbuf [i] = 0;
 404         cfile -> tlen = i;
 405         cfile -> tval = cfile -> tokbuf;
 406         return STRING;
 407 }
 408
 409 static enum dhcp_token read_number (c, cfile)
 410         int c;
 411         struct parse *cfile;
 412 {
 413         int seenx = 0;
 414         int i = 0;
 415         int token = NUMBER;
 416
 417         cfile -> tokbuf [i++] = c;
 418         for (; i < sizeof cfile -> tokbuf; i++) {
 419                 c = get_char (cfile);
 420                 if (!seenx && c == 'x') {
 421                         seenx = 1;
 422 #ifndef OLD_LEXER
 423                 } else if (isascii (c) && !isxdigit (c) &&
 424                            (c == '-' || c == '_' || isalpha (c))) {
 425                         token = NAME;
 426                 } else if (isascii (c) && !isdigit (c) && isxdigit (c)) {
 427                         token = NUMBER_OR_NAME;
 428 #endif
 429                 } else if (!isascii (c) || !isxdigit (c)) {
 430                         if (c != EOF) {
 431                                 cfile -> bufix--;
 432                                 cfile -> ugflag = 1;
 433                         }
 434                         break;
 435                 }
 436                 cfile -> tokbuf [i] = c;
 437         }
 438         if (i == sizeof cfile -> tokbuf) {
 439                 parse_warn (cfile,
 440                             "numeric token larger than internal buffer");
 441                 --i;
 442         }
 443         cfile -> tokbuf [i] = 0;
 444         cfile -> tlen = i;
 445         cfile -> tval = cfile -> tokbuf;
 446         return token;
 447 }
 448
 449 static enum dhcp_token read_num_or_name (c, cfile)
 450         int c;
 451         struct parse *cfile;
 452 {
 453         int i = 0;
 454         enum dhcp_token rv = NUMBER_OR_NAME;
 455         cfile -> tokbuf [i++] = c;
 456         for (; i < sizeof cfile -> tokbuf; i++) {
 457                 c = get_char (cfile);
 458                 if (!isascii (c) ||
 459                     (c != '-' && c != '_' && !isalnum (c))) {
 460                         if (c != EOF) {
 461                                 cfile -> bufix--;
 462                                 cfile -> ugflag = 1;
 463                         }
 464                         break;
 465                 }
 466                 if (!isxdigit (c))
 467                         rv = NAME;
 468                 cfile -> tokbuf [i] = c;
 469         }
 470         if (i == sizeof cfile -> tokbuf) {
 471                 parse_warn (cfile, "token larger than internal buffer");
 472                 --i;
 473         }
 474         cfile -> tokbuf [i] = 0;
 475         cfile -> tlen = i;
 476         cfile -> tval = cfile -> tokbuf;
 477         return intern (cfile -> tval, rv);
 478 }
 479
 480 static enum dhcp_token intern (atom, dfv)
 481         char *atom;
 482         enum dhcp_token dfv;
 483 {
 484         if (!isascii (atom [0]))
 485                 return dfv;
 486
 487         switch (tolower (atom [0])) {
 488               case '-':
 489                 if (atom [1] == 0)
 490                         return MINUS;
 491                 break;
 492
 493               case 'a':
 494                 if (!strncasecmp (atom + 1, "uth", 3)) {
 495                         if (!strncasecmp (atom + 3, "uthenticat", 10)) {
 496                                 if (!strcasecmp (atom + 13, "ed"))
 497                                         return AUTHENTICATED;
 498                                 if (!strcasecmp (atom + 13, "ion"))
 499                                         return AUTHENTICATION;
 500                                 break;
 501                         }
 502                         if (!strcasecmp (atom + 1, "uthoritative"))
 503                                 return AUTHORITATIVE;
 504                         break;
 505                 }
 506                 if (!strcasecmp (atom + 1, "nd"))
 507                         return AND;
 508                 if (!strcasecmp (atom + 1, "ppend"))
 509                         return APPEND;
 510                 if (!strcasecmp (atom + 1, "llow"))
 511                         return ALLOW;
 512                 if (!strcasecmp (atom + 1, "lias"))
 513                         return ALIAS;
 514                 if (!strcasecmp (atom + 1, "lgorithm"))
 515                         return ALGORITHM;
 516                 if (!strcasecmp (atom + 1, "bandoned"))
 517                         return TOKEN_ABANDONED;
 518                 if (!strcasecmp (atom + 1, "dd"))
 519                         return TOKEN_ADD;
 520                 if (!strcasecmp (atom + 1, "ll"))
 521                         return ALL;
 522                 if (!strcasecmp (atom + 1, "t"))
 523                         return AT;
 524                 if (!strcasecmp (atom + 1, "rray"))
 525                         return ARRAY;
 526                 if (!strcasecmp (atom + 1, "ddress"))
 527                         return ADDRESS;
 528                 if (!strcasecmp (atom + 1, "ctive"))
 529                         return TOKEN_ACTIVE;
 530                 break;
 531               case 'b':
 532                 if (!strcasecmp (atom + 1, "ackup"))
 533                         return TOKEN_BACKUP;
 534                 if (!strcasecmp (atom + 1, "ootp"))
 535                         return TOKEN_BOOTP;
 536                 if (!strcasecmp (atom + 1, "inding"))
 537                         return BINDING;
 538                 if (!strcasecmp (atom + 1, "inary-to-ascii"))
 539                         return BINARY_TO_ASCII;
 540                 if (!strcasecmp (atom + 1, "ackoff-cutoff"))
 541                         return BACKOFF_CUTOFF;
 542                 if (!strcasecmp (atom + 1, "ooting"))
 543                         return BOOTING;
 544                 if (!strcasecmp (atom + 1, "oot-unknown-clients"))
 545                         return BOOT_UNKNOWN_CLIENTS;
 546                 if (!strcasecmp (atom + 1, "reak"))
 547                         return BREAK;
 548                 if (!strcasecmp (atom + 1, "illing"))
 549                         return BILLING;
 550                 if (!strcasecmp (atom + 1, "oolean"))
 551                         return BOOLEAN;
 552                 if (!strcasecmp (atom + 1, "alance"))
 553                         return BALANCE;
 554                 if (!strcasecmp (atom + 1, "ound"))
 555                         return BOUND;
 556                 break;
 557               case 'c':
 558                 if (!strcasecmp (atom + 1, "ase"))
 559                         return CASE;
 560                 if (!strcasecmp (atom + 1, "ommit"))
 561                         return COMMIT;
 562                 if (!strcasecmp (atom + 1, "ode"))
 563                         return CODE;
 564                 if (!strcasecmp (atom + 1, "onfig-option"))
 565                         return CONFIG_OPTION;
 566                 if (!strcasecmp (atom + 1, "heck"))
 567                         return CHECK;
 568                 if (!strcasecmp (atom + 1, "lass"))
 569                         return CLASS;
 570                 if (!strcasecmp (atom + 1, "lose"))
 571                         return TOKEN_CLOSE;
 572                 if (!strcasecmp (atom + 1, "reate"))
 573                         return TOKEN_CREATE;
 574                 if (!strcasecmp (atom + 1, "iaddr"))
 575                         return CIADDR;
 576                 if (!strncasecmp (atom + 1, "lient", 5)) {
 577                         if (!strcasecmp (atom + 6, "-identifier"))
 578                                 return CLIENT_IDENTIFIER;
 579                         if (!strcasecmp (atom + 6, "-hostname"))
 580                                 return CLIENT_HOSTNAME;
 581                         if (!strcasecmp (atom + 6, "-state"))
 582                                 return CLIENT_STATE;
 583                         if (!strcasecmp (atom + 6, "-updates"))
 584                                 return CLIENT_UPDATES;
 585                         if (!strcasecmp (atom + 6, "s"))
 586                                 return CLIENTS;
 587                 }
 588                 if (!strcasecmp (atom + 1, "oncat"))
 589                         return CONCAT;
 590                 if (!strcasecmp (atom + 1, "onnect"))
 591                         return CONNECT;
 592                 if (!strcasecmp (atom + 1, "ommunications-interrupted"))
 593                         return COMMUNICATIONS_INTERRUPTED;
 594                 if (!strcasecmp (atom + 1, "ltt"))
 595                         return CLTT;
 596                 break;
 597               case 'd':
 598                 if (!strcasecmp (atom + 1, "ns-update"))
 599                         return DNS_UPDATE;
 600                 if (!strcasecmp (atom + 1, "ns-delete"))
 601                         return DNS_DELETE;
 602                 if (!strcasecmp (atom + 1, "omain"))
 603                         return DOMAIN;
 604                 if (!strcasecmp (atom + 1, "omain-name"))
 605                         return DOMAIN_NAME;
 606                 if (!strcasecmp (atom + 1, "o-forward-update"))
 607                         return DO_FORWARD_UPDATE;
 608                 if (!strcasecmp (atom + 1, "ebug"))
 609                         return TOKEN_DEBUG;
 610                 if (!strcasecmp (atom + 1, "eny"))
 611                         return DENY;
 612                 if (!strcasecmp (atom + 1, "eleted"))
 613                         return TOKEN_DELETED;
 614                 if (!strcasecmp (atom + 1, "elete"))
 615                         return TOKEN_DELETE;
 616                 if (!strncasecmp (atom + 1, "efault", 6)) {
 617                         if (!atom [7])
 618                                 return DEFAULT;
 619                         if (!strcasecmp (atom + 7, "-lease-time"))
 620                                 return DEFAULT_LEASE_TIME;
 621                         break;
 622                 }
 623                 if (!strncasecmp (atom + 1, "ynamic", 6)) {
 624                         if (!atom [7])
 625                                 return DYNAMIC;
 626                         if (!strncasecmp (atom + 7, "-bootp", 6)) {
 627                                 if (!atom [13])
 628                                         return DYNAMIC_BOOTP;
 629                                 if (!strcasecmp (atom + 13, "-lease-cutoff"))
 630                                         return DYNAMIC_BOOTP_LEASE_CUTOFF;
 631                                 if (!strcasecmp (atom + 13, "-lease-length"))
 632                                         return DYNAMIC_BOOTP_LEASE_LENGTH;
 633                                 break;
 634                         }
 635                 }
 636                 if (!strcasecmp (atom + 1, "uplicates"))
 637                         return DUPLICATES;
 638                 if (!strcasecmp (atom + 1, "eclines"))
 639                         return DECLINES;
 640                 if (!strncasecmp (atom + 1, "efine", 5)) {
 641                         if (!strcasecmp (atom + 6, "d"))
 642                                 return DEFINED;
 643                         if (!atom [6])
 644                                 return DEFINE;
 645                 }
 646                 break;
 647               case 'e':
 648                 if (isascii (atom [1]) && tolower (atom [1]) == 'x') {
 649                         if (!strcasecmp (atom + 2, "tract-int"))
 650                                 return EXTRACT_INT;
 651                         if (!strcasecmp (atom + 2, "ists"))
 652                                 return EXISTS;
 653                         if (!strcasecmp (atom + 2, "piry"))
 654                                 return EXPIRY;
 655                         if (!strcasecmp (atom + 2, "pire"))
 656                                 return EXPIRE;
 657                         if (!strcasecmp (atom + 2, "pired"))
 658                                 return TOKEN_EXPIRED;
 659                 }
 660                 if (!strcasecmp (atom + 1, "ncode-int"))
 661                         return ENCODE_INT;
 662                 if (!strcasecmp (atom + 1, "thernet"))
 663                         return ETHERNET;
 664                 if (!strcasecmp (atom + 1, "nds"))
 665                         return ENDS;
 666                 if (!strncasecmp (atom + 1, "ls", 2)) {
 667                         if (!strcasecmp (atom + 3, "e"))
 668                                 return ELSE;
 669                         if (!strcasecmp (atom + 3, "if"))
 670                                 return ELSIF;
 671                         break;
 672                 }
 673                 if (!strcasecmp (atom + 1, "rror"))
 674                         return ERROR;
 675                 if (!strcasecmp (atom + 1, "val"))
 676                         return EVAL;
 677                 if (!strcasecmp (atom + 1, "ncapsulate"))
 678                         return ENCAPSULATE;
 679                 break;
 680               case 'f':
 681                 if (!strcasecmp (atom + 1, "atal"))
 682                         return FATAL;
 683                 if (!strcasecmp (atom + 1, "ilename"))
 684                         return FILENAME;
 685                 if (!strcasecmp (atom + 1, "ixed-address"))
 686                         return FIXED_ADDR;
 687                 if (!strcasecmp (atom + 1, "ddi"))
 688                         return FDDI;
 689                 if (!strcasecmp (atom + 1, "ormerr"))
 690                         return NS_FORMERR;
 691                 if (!strcasecmp (atom + 1, "unction"))
 692                         return FUNCTION;
 693                 if (!strcasecmp (atom + 1, "ailover"))
 694                         return FAILOVER;
 695                 if (!strcasecmp (atom + 1, "ree"))
 696                         return TOKEN_FREE;
 697                 break;
 698               case 'g':
 699                 if (!strcasecmp (atom + 1, "iaddr"))
 700                         return GIADDR;
 701                 if (!strcasecmp (atom + 1, "roup"))
 702                         return GROUP;
 703                 if (!strcasecmp (atom + 1, "et-lease-hostnames"))
 704                         return GET_LEASE_HOSTNAMES;
 705                 break;
 706               case 'h':
 707                 if (!strcasecmp (atom + 1, "ba"))
 708                         return HBA;
 709                 if (!strcasecmp (atom + 1, "ost"))
 710                         return HOST;
 711                 if (!strcasecmp (atom + 1, "ost-decl-name"))
 712                         return HOST_DECL_NAME;
 713                 if (!strcasecmp (atom + 1, "ardware"))
 714                         return HARDWARE;
 715                 if (!strcasecmp (atom + 1, "ostname"))
 716                         return HOSTNAME;
 717                 if (!strcasecmp (atom + 1, "elp"))
 718                         return TOKEN_HELP;
 719                 break;
 720               case 'i':
 721                 if (!strcasecmp (atom + 1, "nclude"))
 722                         return INCLUDE;
 723                 if (!strcasecmp (atom + 1, "nteger"))
 724                         return INTEGER;
 725                 if (!strcasecmp (atom + 1, "nfinite"))
 726                         return INFINITE;
 727                 if (!strcasecmp (atom + 1, "nfo"))
 728                         return INFO;
 729                 if (!strcasecmp (atom + 1, "p-address"))
 730                         return IP_ADDRESS;
 731                 if (!strcasecmp (atom + 1, "nitial-interval"))
 732                         return INITIAL_INTERVAL;
 733                 if (!strcasecmp (atom + 1, "nterface"))
 734                         return INTERFACE;
 735                 if (!strcasecmp (atom + 1, "dentifier"))
 736                         return IDENTIFIER;
 737                 if (!strcasecmp (atom + 1, "f"))
 738                         return IF;
 739                 if (!strcasecmp (atom + 1, "s"))
 740                         return IS;
 741                 if (!strcasecmp (atom + 1, "gnore"))
 742                         return IGNORE;
 743                 break;
 744               case 'k':
 745                 if (!strncasecmp (atom + 1, "nown", 4)) {
 746                         if (!strcasecmp (atom + 5, "-clients"))
 747                                 return KNOWN_CLIENTS;
 748                         if (!atom[5])
 749                                 return KNOWN;
 750                         break;
 751                 }
 752                 if (!strcasecmp (atom + 1, "ey"))
 753                         return KEY;
 754                 break;
 755               case 'l':
 756                 if (!strcasecmp (atom + 1, "ease"))
 757                         return LEASE;
 758                 if (!strcasecmp (atom + 1, "eased-address"))
 759                         return LEASED_ADDRESS;
 760                 if (!strcasecmp (atom + 1, "ease-time"))
 761                         return LEASE_TIME;
 762                 if (!strcasecmp (atom + 1, "imit"))
 763                         return LIMIT;
 764                 if (!strcasecmp (atom + 1, "et"))
 765                         return LET;
 766                 if (!strcasecmp (atom + 1, "oad"))
 767                         return LOAD;
 768                 if (!strcasecmp (atom + 1, "og"))
 769                         return LOG;
 770                 break;
 771               case 'm':
 772                 if (!strncasecmp (atom + 1, "ax", 2)) {
 773                         if (!atom [3])
 774                                 return TOKEN_MAX;
 775                         if (!strcasecmp (atom + 3, "-lease-time"))
 776                                 return MAX_LEASE_TIME;
 777                         if (!strcasecmp (atom + 3, "-transmit-idle"))
 778                                 return MAX_TRANSMIT_IDLE;
 779                         if (!strcasecmp (atom + 3, "-response-delay"))
 780                                 return MAX_RESPONSE_DELAY;
 781                         if (!strcasecmp (atom + 3, "-unacked-updates"))
 782                                 return MAX_UNACKED_UPDATES;
 783                 }
 784                 if (!strncasecmp (atom + 1, "in-", 3)) {
 785                         if (!strcasecmp (atom + 4, "lease-time"))
 786                                 return MIN_LEASE_TIME;
 787                         if (!strcasecmp (atom + 4, "secs"))
 788                                 return MIN_SECS;
 789                         break;
 790                 }
 791                 if (!strncasecmp (atom + 1, "edi", 3)) {
 792                         if (!strcasecmp (atom + 4, "a"))
 793                                 return MEDIA;
 794                         if (!strcasecmp (atom + 4, "um"))
 795                                 return MEDIUM;
 796                         break;
 797                 }
 798                 if (!strcasecmp (atom + 1, "atch"))
 799                         return MATCH;
 800                 if (!strcasecmp (atom + 1, "embers"))
 801                         return MEMBERS;
 802                 if (!strcasecmp (atom + 1, "y"))
 803                         return MY;
 804                 if (!strcasecmp (atom + 1, "clt"))
 805                         return MCLT;
 806                 break;
 807               case 'n':
 808                 if (!strcasecmp (atom + 1, "ormal"))
 809                         return NORMAL;
 810                 if (!strcasecmp (atom + 1, "ameserver"))
 811                         return NAMESERVER;
 812                 if (!strcasecmp (atom + 1, "etmask"))
 813                         return NETMASK;
 814                 if (!strcasecmp (atom + 1, "ever"))
 815                         return NEVER;
 816                 if (!strcasecmp (atom + 1, "ext-server"))
 817                         return NEXT_SERVER;
 818                 if (!strcasecmp (atom + 1, "ot"))
 819                         return TOKEN_NOT;
 820                 if (!strcasecmp (atom + 1, "o"))
 821                         return NO;
 822                 if (!strcasecmp (atom + 1, "s-update"))
 823                         return NS_UPDATE;
 824                 if (!strcasecmp (atom + 1, "oerror"))
 825                         return NS_NOERROR;
 826                 if (!strcasecmp (atom + 1, "otauth"))
 827                         return NS_NOTAUTH;
 828                 if (!strcasecmp (atom + 1, "otimp"))
 829                         return NS_NOTIMP;
 830                 if (!strcasecmp (atom + 1, "otzone"))
 831                         return NS_NOTZONE;
 832                 if (!strcasecmp (atom + 1, "xdomain"))
 833                         return NS_NXDOMAIN;
 834                 if (!strcasecmp (atom + 1, "xrrset"))
 835                         return NS_NXRRSET;
 836                 if (!strcasecmp (atom + 1, "ull"))
 837                         return TOKEN_NULL;
 838                 if (!strcasecmp (atom + 1, "ext"))
 839                         return TOKEN_NEXT;
 840                 if (!strcasecmp (atom + 1, "ew"))
 841                         return TOKEN_NEW;
 842                 break;
 843               case 'o':
 844                 if (!strcasecmp (atom + 1, "mapi"))
 845                         return OMAPI;
 846                 if (!strcasecmp (atom + 1, "r"))
 847                         return OR;
 848                 if (!strcasecmp (atom + 1, "n"))
 849                         return ON;
 850                 if (!strcasecmp (atom + 1, "pen"))
 851                         return TOKEN_OPEN;
 852                 if (!strcasecmp (atom + 1, "ption"))
 853                         return OPTION;
 854                 if (!strcasecmp (atom + 1, "ne-lease-per-client"))
 855                         return ONE_LEASE_PER_CLIENT;
 856                 if (!strcasecmp (atom + 1, "f"))
 857                         return OF;
 858                 if (!strcasecmp (atom + 1, "wner"))
 859                         return OWNER;
 860                 break;
 861               case 'p':
 862                 if (!strcasecmp (atom + 1, "repend"))
 863                         return PREPEND;
 864                 if (!strcasecmp (atom + 1, "acket"))
 865                         return PACKET;
 866                 if (!strcasecmp (atom + 1, "ool"))
 867                         return POOL;
 868                 if (!strcasecmp (atom + 1, "seudo"))
 869                         return PSEUDO;
 870                 if (!strcasecmp (atom + 1, "eer"))
 871                         return PEER;
 872                 if (!strcasecmp (atom + 1, "rimary"))
 873                         return PRIMARY;
 874                 if (!strncasecmp (atom + 1, "artner", 6)) {
 875                         if (!atom [7])
 876                                 return PARTNER;
 877                         if (!strcasecmp (atom + 7, "-down"))
 878                                 return PARTNER_DOWN;
 879                 }
 880                 if (!strcasecmp (atom + 1, "ort"))
 881                         return PORT;
 882                 if (!strcasecmp (atom + 1, "otential-conflict"))
 883                         return POTENTIAL_CONFLICT;
 884                 if (!strcasecmp (atom + 1, "ick-first-value") ||
 885                     !strcasecmp (atom + 1, "ick"))
 886                         return PICK;
 887                 if (!strcasecmp (atom + 1, "aused"))
 888                         return PAUSED;
 889                 break;
 890               case 'r':
 891                 if (!strcasecmp (atom + 1, "esolution-interrupted"))
 892                         return RESOLUTION_INTERRUPTED;
 893                 if (!strcasecmp (atom + 1, "ange"))
 894                         return RANGE;
 895                 if (!strcasecmp (atom + 1, "ecover"))
 896                         return RECOVER;
 897                 if (!strcasecmp (atom + 1, "ecover-done"))
 898                         return RECOVER_DONE;
 899                 if (!strcasecmp (atom + 1, "ecover-wait"))
 900                         return RECOVER_WAIT;
 901                 if (!strcasecmp (atom + 1, "econtact-interval"))
 902                         return RECONTACT_INTERVAL;
 903                 if (!strcasecmp (atom + 1, "equest"))
 904                         return REQUEST;
 905                 if (!strcasecmp (atom + 1, "equire"))
 906                         return REQUIRE;
 907                 if (!strcasecmp (atom + 1, "equire"))
 908                         return REQUIRE;
 909                 if (!strcasecmp (atom + 1, "etry"))
 910                         return RETRY;
 911                 if (!strcasecmp (atom + 1, "eturn"))
 912                         return RETURN;
 913                 if (!strcasecmp (atom + 1, "enew"))
 914                         return RENEW;
 915                 if (!strcasecmp (atom + 1, "ebind"))
 916                         return REBIND;
 917                 if (!strcasecmp (atom + 1, "eboot"))
 918                         return REBOOT;
 919                 if (!strcasecmp (atom + 1, "eject"))
 920                         return REJECT;
 921                 if (!strcasecmp (atom + 1, "everse"))
 922                         return REVERSE;
 923                 if (!strcasecmp (atom + 1, "elease"))
 924                         return RELEASE;
 925                 if (!strcasecmp (atom + 1, "efused"))
 926                         return NS_REFUSED;
 927                 if (!strcasecmp (atom + 1, "eleased"))
 928                         return TOKEN_RELEASED;
 929                 if (!strcasecmp (atom + 1, "eset"))
 930                         return TOKEN_RESET;
 931                 if (!strcasecmp (atom + 1, "eserved"))
 932                         return TOKEN_RESERVED;
 933                 if (!strcasecmp (atom + 1, "emove"))
 934                         return REMOVE;
 935                 if (!strcasecmp (atom + 1, "efresh"))
 936                         return REFRESH;
 937                 break;
 938               case 's':
 939                 if (!strcasecmp (atom + 1, "tate"))
 940                         return STATE;
 941                 if (!strcasecmp (atom + 1, "ecret"))
 942                         return SECRET;
 943                 if (!strcasecmp (atom + 1, "ervfail"))
 944                         return NS_SERVFAIL;
 945                 if (!strcasecmp (atom + 1, "witch"))
 946                         return SWITCH;
 947                 if (!strcasecmp (atom + 1, "igned"))
 948                         return SIGNED;
 949                 if (!strcasecmp (atom + 1, "tring"))
 950                         return STRING_TOKEN;
 951                 if (!strcasecmp (atom + 1, "uffix"))
 952                         return SUFFIX;
 953                 if (!strcasecmp (atom + 1, "earch"))
 954                         return SEARCH;
 955                 if (!strcasecmp (atom + 1, "tarts"))
 956                         return STARTS;
 957                 if (!strcasecmp (atom + 1, "iaddr"))
 958                         return SIADDR;
 959                 if (!strcasecmp (atom + 1, "hared-network"))
 960                         return SHARED_NETWORK;
 961                 if (!strcasecmp (atom + 1, "econdary"))
 962                         return SECONDARY;
 963                 if (!strcasecmp (atom + 1, "erver-name"))
 964                         return SERVER_NAME;
 965                 if (!strcasecmp (atom + 1, "erver-identifier"))
 966                         return SERVER_IDENTIFIER;
 967                 if (!strcasecmp (atom + 1, "erver"))
 968                         return SERVER;
 969                 if (!strcasecmp (atom + 1, "elect-timeout"))
 970                         return SELECT_TIMEOUT;
 971                 if (!strcasecmp (atom + 1, "elect"))
 972                         return SELECT;
 973                 if (!strcasecmp (atom + 1, "end"))
 974                         return SEND;
 975                 if (!strcasecmp (atom + 1, "cript"))
 976                         return SCRIPT;
 977                 if (!strcasecmp (atom + 1, "upersede"))
 978                         return SUPERSEDE;
 979                 if (!strncasecmp (atom + 1, "ub", 2)) {
 980                         if (!strcasecmp (atom + 3, "string"))
 981                                 return SUBSTRING;
 982                         if (!strcasecmp (atom + 3, "net"))
 983                                 return SUBNET;
 984                         if (!strcasecmp (atom + 3, "class"))
 985                                 return SUBCLASS;
 986                         break;
 987                 }
 988                 if (!strcasecmp (atom + 1, "pawn"))
 989                         return SPAWN;
 990                 if (!strcasecmp (atom + 1, "pace"))
 991                         return SPACE;
 992                 if (!strcasecmp (atom + 1, "tatic"))
 993                         return STATIC;
 994                 if (!strcasecmp (atom + 1, "plit"))
 995                         return SPLIT;
 996                 if (!strcasecmp (atom + 1, "et"))
 997                         return TOKEN_SET;
 998                 if (!strcasecmp (atom + 1, "econds"))
 999                         return SECONDS;
1000                 if (!strcasecmp (atom + 1, "hutdown"))
1001                         return SHUTDOWN;
1002                 if (!strcasecmp (atom + 1, "tartup"))
1003                         return STARTUP;
1004                 break;
1005               case 't':
1006                 if (!strcasecmp (atom + 1, "imestamp"))
1007                         return TIMESTAMP;
1008                 if (!strcasecmp (atom + 1, "imeout"))
1009                         return TIMEOUT;
1010                 if (!strcasecmp (atom + 1, "oken-ring"))
1011                         return TOKEN_RING;
1012                 if (!strcasecmp (atom + 1, "ext"))
1013                         return TEXT;
1014                 if (!strcasecmp (atom + 1, "stp"))
1015                         return TSTP;
1016                 if (!strcasecmp (atom + 1, "sfp"))
1017                         return TSFP;
1018                 if (!strcasecmp (atom + 1, "ransmission"))
1019                         return TRANSMISSION;
1020                 break;
1021               case 'u':
1022                 if (!strcasecmp (atom + 1, "nset"))
1023                         return UNSET;
1024                 if (!strcasecmp (atom + 1, "nsigned"))
1025                         return UNSIGNED;
1026                 if (!strcasecmp (atom + 1, "id"))
1027                         return UID;
1028                 if (!strncasecmp (atom + 1, "se", 2)) {
1029                         if (!strcasecmp (atom + 3, "r-class"))
1030                                 return USER_CLASS;
1031                         if (!strcasecmp (atom + 3, "-host-decl-names"))
1032                                 return USE_HOST_DECL_NAMES;
1033                         if (!strcasecmp (atom + 3,
1034                                          "-lease-addr-for-default-route"))
1035                                 return USE_LEASE_ADDR_FOR_DEFAULT_ROUTE;
1036                         break;
1037                 }
1038                 if (!strncasecmp (atom + 1, "nknown", 6)) {
1039                         if (!strcasecmp (atom + 7, "-clients"))
1040                                 return UNKNOWN_CLIENTS;
1041                         if (!strcasecmp (atom + 7, "-state"))
1042                                 return UNKNOWN_STATE;
1043                         if (!atom [7])
1044                                 return UNKNOWN;
1045                         break;
1046                 }
1047                 if (!strcasecmp (atom + 1, "nauthenticated"))
1048                         return AUTHENTICATED;
1049                 if (!strcasecmp (atom + 1, "pdated-dns-rr"))
1050                         return UPDATED_DNS_RR;
1051                 if (!strcasecmp (atom + 1, "pdate"))
1052                         return UPDATE;
1053                 break;
1054               case 'v':
1055                 if (!strcasecmp (atom + 1, "endor-class"))
1056                         return VENDOR_CLASS;
1057                 if (!strcasecmp (atom + 1, "endor"))
1058                         return VENDOR;
1059                 break;
1060               case 'w':
1061                 if (!strcasecmp (atom + 1, "ith"))
1062                         return WITH;
1063                 break;
1064               case 'y':
1065                 if (!strcasecmp (atom + 1, "iaddr"))
1066                         return YIADDR;
1067                 if (!strcasecmp (atom + 1, "xdomain"))
1068                         return NS_YXDOMAIN;
1069                 if (!strcasecmp (atom + 1, "xrrset"))
1070                         return NS_YXRRSET;
1071                 break;
1072               case 'z':
1073                 if (!strcasecmp (atom + 1, "one"))
1074                         return ZONE;
1075                 break;
1076         }
1077         return dfv;
1078 }