parse.c 82.6 KB
Newer Older
1 2 3 4 5
/* parse.c

   Common parser code for dhcpd and dhclient. */

/*
Ted Lemon's avatar
Ted Lemon committed
6 7 8 9 10 11
 * Copyright (c) 1996-1999 Internet Software Consortium.
 * Use is subject to license terms which appear in the file named
 * ISC-LICENSE that should have accompanied this file when you
 * received it.   If a file named ISC-LICENSE did not accompany this
 * file, or you are not sure the one you have is correct, you may
 * obtain an applicable copy of the license at:
12
 *
Ted Lemon's avatar
Ted Lemon committed
13
 *             http://www.isc.org/isc-license-1.0.html. 
14
 *
Ted Lemon's avatar
Ted Lemon committed
15 16 17
 * This file is part of the ISC DHCP distribution.   The documentation
 * associated with this file is listed in the file DOCUMENTATION,
 * included in the top-level directory of this release.
18
 *
Ted Lemon's avatar
Ted Lemon committed
19 20
 * Support and other services are available for ISC products - see
 * http://www.isc.org for more information.
21 22 23 24
 */

#ifndef lint
static char copyright[] =
Ted Lemon's avatar
Ted Lemon committed
25
"$Id: parse.c,v 1.59 2000/01/25 01:13:21 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.  All rights reserved.\n";
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
#endif /* not lint */

#include "dhcpd.h"

/* Skip to the semicolon ending the current statement.   If we encounter
   braces, the matching closing brace terminates the statement.   If we
   encounter a right brace but haven't encountered a left brace, return
   leaving the brace in the token buffer for the caller.   If we see a
   semicolon and haven't seen a left brace, return.   This lets us skip
   over:

   	statement;
	statement foo bar { }
	statement foo bar { statement { } }
	statement}
 
	...et cetera. */

void skip_to_semi (cfile)
45
	struct parse *cfile;
46 47 48 49 50
{
	skip_to_rbrace (cfile, 0);
}

void skip_to_rbrace (cfile, brace_count)
51
	struct parse *cfile;
52
	int brace_count;
53
{
54
	enum dhcp_token token;
55
	const char *val;
56

57 58 59
#if defined (DEBUG_TOKEN)
	log_error ("skip_to_rbrace: %d\n", brace_count);
#endif
60 61 62
	do {
		token = peek_token (&val, cfile);
		if (token == RBRACE) {
63
			token = next_token (&val, cfile);
64 65 66 67 68 69 70 71 72 73
			if (brace_count) {
				if (!--brace_count)
					return;
			} else
				return;
		} else if (token == LBRACE) {
			brace_count++;
		} else if (token == SEMI && !brace_count) {
			token = next_token (&val, cfile);
			return;
74 75 76 77 78 79
		} else if (token == EOL) {
			/* EOL only happens when parsing /etc/resolv.conf,
			   and we treat it like a semicolon because the
			   resolv.conf file is line-oriented. */
			token = next_token (&val, cfile);
			return;
80 81 82 83 84 85
		}
		token = next_token (&val, cfile);
	} while (token != EOF);
}

int parse_semi (cfile)
86
	struct parse *cfile;
87
{
88
	enum dhcp_token token;
89
	const char *val;
90 91 92

	token = next_token (&val, cfile);
	if (token != SEMI) {
93
		parse_warn (cfile, "semicolon expected.");
94 95 96 97 98 99 100 101 102
		skip_to_semi (cfile);
		return 0;
	}
	return 1;
}

/* string-parameter :== STRING SEMI */

char *parse_string (cfile)
103
	struct parse *cfile;
104
{
105
	const char *val;
106
	enum dhcp_token token;
107 108 109 110
	char *s;

	token = next_token (&val, cfile);
	if (token != STRING) {
111
		parse_warn (cfile, "filename must be a string");
112 113 114
		skip_to_semi (cfile);
		return (char *)0;
	}
Ted Lemon's avatar
Ted Lemon committed
115
	s = (char *)dmalloc (strlen (val) + 1, MDL);
116
	if (!s)
117
		log_fatal ("no memory for string %s.", val);
118 119 120 121 122 123 124
	strcpy (s, val);

	if (!parse_semi (cfile))
		return (char *)0;
	return s;
}

125 126 127 128 129
/*
 * hostname :== IDENTIFIER
 *		| IDENTIFIER DOT
 *		| hostname DOT IDENTIFIER
 */
130 131

char *parse_host_name (cfile)
132
	struct parse *cfile;
133
{
134
	const char *val;
135
	enum dhcp_token token;
136
	unsigned len = 0;
137 138 139 140 141 142 143
	char *s;
	char *t;
	pair c = (pair)0;
	
	/* Read a dotted hostname... */
	do {
		/* Read a token, which should be an identifier. */
Ted Lemon's avatar
Ted Lemon committed
144 145 146
		token = peek_token (&val, cfile);
		if (!is_identifier (token) && token != NUMBER)
			break;
147
		token = next_token (&val, cfile);
Ted Lemon's avatar
Ted Lemon committed
148

149
		/* Store this identifier... */
Ted Lemon's avatar
Ted Lemon committed
150
		if (!(s = (char *)dmalloc (strlen (val) + 1, MDL)))
151
			log_fatal ("can't allocate temp space for hostname.");
152 153 154 155 156 157 158 159 160 161 162
		strcpy (s, val);
		c = cons ((caddr_t)s, c);
		len += strlen (s) + 1;
		/* Look for a dot; if it's there, keep going, otherwise
		   we're done. */
		token = peek_token (&val, cfile);
		if (token == DOT)
			token = next_token (&val, cfile);
	} while (token == DOT);

	/* Assemble the hostname together into a string. */
Ted Lemon's avatar
Ted Lemon committed
163
	if (!(s = (char *)dmalloc (len, MDL)))
164
		log_fatal ("can't allocate space for hostname.");
165 166 167 168
	t = s + len;
	*--t = 0;
	while (c) {
		pair cdr = c -> cdr;
169
		unsigned l = strlen ((char *)(c -> car));
170 171 172
		t -= l;
		memcpy (t, (char *)(c -> car), l);
		/* Free up temp space. */
Ted Lemon's avatar
Ted Lemon committed
173 174
		dfree (c -> car, MDL);
		dfree (c, MDL);
175 176 177 178 179 180 181
		c = cdr;
		if (t != s)
			*--t = '.';
	}
	return s;
}

182 183 184 185 186 187 188
/* ip-addr-or-hostname :== ip-address | hostname
   ip-address :== NUMBER DOT NUMBER DOT NUMBER DOT NUMBER
   
   Parse an ip address or a hostname.   If uniform is zero, put in
   an expr_substring node to limit hostnames that evaluate to more
   than one IP address. */

189 190
int parse_ip_addr_or_hostname (expr, cfile, uniform)
	struct expression **expr;
191
	struct parse *cfile;
192 193
	int uniform;
{
194
	const char *val;
195
	enum dhcp_token token;
196
	unsigned char addr [4];
197
	unsigned len = sizeof addr;
198
	char *name;
199
	struct expression *x = (struct expression *)0;
200 201 202 203 204

	token = peek_token (&val, cfile);
	if (is_identifier (token)) {
		name = parse_host_name (cfile);
		if (!name)
205 206 207 208 209 210 211 212 213 214
			return 0;
		if (!make_host_lookup (expr, name))
			return 0;
		if (!uniform) {
			if (!make_limit (&x, *expr, 4))
				return 0;
			expression_dereference (expr,
						"parse_ip_addr_or_hostname");
			*expr = x;
		}
215 216
	} else if (token == NUMBER) {
		if (!parse_numeric_aggregate (cfile, addr, &len, DOT, 10, 8))
217 218
			return 0;
		return make_const_data (expr, addr, len, 0, 1);
219 220 221
	} else {
		if (token != RBRACE && token != LBRACE)
			token = next_token (&val, cfile);
222
		parse_warn (cfile, "%s (%d): expecting IP address or hostname",
223 224 225
			    val, token);
		if (token != SEMI)
			skip_to_semi (cfile);
226
		return 0;
227 228
	}

229
	return 1;
230 231 232 233 234 235
}	
	
/*
 * ip-address :== NUMBER DOT NUMBER DOT NUMBER DOT NUMBER
 */

236
int parse_ip_addr (cfile, addr)
237
	struct parse *cfile;
238 239
	struct iaddr *addr;
{
240
	const char *val;
241
	enum dhcp_token token;
242 243 244 245 246 247 248 249

	addr -> len = 4;
	if (parse_numeric_aggregate (cfile, addr -> iabuf,
				     &addr -> len, DOT, 10, 8))
		return 1;
	return 0;
}	

250 251 252 253
/*
 * hardware-parameter :== HARDWARE hardware-type colon-seperated-hex-list SEMI
 * hardware-type :== ETHERNET | TOKEN_RING
 */
254 255

void parse_hardware_param (cfile, hardware)
256
	struct parse *cfile;
257 258
	struct hardware *hardware;
{
259
	const char *val;
260
	enum dhcp_token token;
261
	unsigned hlen;
262 263 264 265 266
	unsigned char *t;

	token = next_token (&val, cfile);
	switch (token) {
	      case ETHERNET:
267
		hardware -> hbuf [0] = HTYPE_ETHER;
268 269
		break;
	      case TOKEN_RING:
270
		hardware -> hbuf [0] = HTYPE_IEEE802;
271
		break;
272
	      case FDDI:
273
		hardware -> hbuf [0] = HTYPE_FDDI;
274
		break;
275
	      default:
276
		parse_warn (cfile, "expecting a network hardware type");
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292
		skip_to_semi (cfile);
		return;
	}

	/* Parse the hardware address information.   Technically,
	   it would make a lot of sense to restrict the length of the
	   data we'll accept here to the length of a particular hardware
	   address type.   Unfortunately, there are some broken clients
	   out there that put bogus data in the chaddr buffer, and we accept
	   that data in the lease file rather than simply failing on such
	   clients.   Yuck. */
	hlen = 0;
	t = parse_numeric_aggregate (cfile, (unsigned char *)0, &hlen,
				     COLON, 16, 8);
	if (!t)
		return;
293
	if (hlen + 1 > sizeof hardware -> hbuf) {
Ted Lemon's avatar
Ted Lemon committed
294
		dfree (t, MDL);
295
		parse_warn (cfile, "hardware address too long");
296
	} else {
297 298 299 300 301
		hardware -> hlen = hlen + 1;
		memcpy ((unsigned char *)&hardware -> hbuf [1], t, hlen);
		if (hlen + 1 < sizeof hardware -> hbuf)
			memset (&hardware -> hbuf [hlen + 1], 0,
				(sizeof hardware -> hbuf) - hlen - 1);
Ted Lemon's avatar
Ted Lemon committed
302
		dfree (t, MDL);
303 304 305 306
	}
	
	token = next_token (&val, cfile);
	if (token != SEMI) {
307
		parse_warn (cfile, "expecting semicolon.");
308 309 310 311 312 313 314
		skip_to_semi (cfile);
	}
}

/* lease-time :== NUMBER SEMI */

void parse_lease_time (cfile, timep)
315
	struct parse *cfile;
316 317
	TIME *timep;
{
318
	const char *val;
319
	enum dhcp_token token;
320 321 322

	token = next_token (&val, cfile);
	if (token != NUMBER) {
323
		parse_warn (cfile, "Expecting numeric lease time");
324 325 326
		skip_to_semi (cfile);
		return;
	}
327
	convert_num (cfile, (unsigned char *)timep, val, 10, 32);
328 329 330 331 332 333 334 335 336 337 338 339 340 341 342
	/* Unswap the number - convert_num returns stuff in NBO. */
	*timep = ntohl (*timep); /* XXX */

	parse_semi (cfile);
}

/* No BNF for numeric aggregates - that's defined by the caller.  What
   this function does is to parse a sequence of numbers seperated by
   the token specified in seperator.  If max is zero, any number of
   numbers will be parsed; otherwise, exactly max numbers are
   expected.  Base and size tell us how to internalize the numbers
   once they've been tokenized. */

unsigned char *parse_numeric_aggregate (cfile, buf,
					max, seperator, base, size)
343
	struct parse *cfile;
344
	unsigned char *buf;
345
	unsigned *max;
346 347
	int seperator;
	int base;
348
	unsigned size;
349
{
350
	const char *val;
351
	enum dhcp_token token;
352
	unsigned char *bufp = buf, *s, *t;
353
	unsigned count = 0;
354 355 356
	pair c = (pair)0;

	if (!bufp && *max) {
Ted Lemon's avatar
Ted Lemon committed
357
		bufp = (unsigned char *)dmalloc (*max * size / 8, MDL);
358
		if (!bufp)
359 360
			log_fatal ("no space for numeric aggregate");
		s = 0;
361 362 363 364 365 366 367 368 369 370 371
	} else
		s = bufp;

	do {
		if (count) {
			token = peek_token (&val, cfile);
			if (token != seperator) {
				if (!*max)
					break;
				if (token != RBRACE && token != LBRACE)
					token = next_token (&val, cfile);
372
				parse_warn (cfile, "too few numbers.");
373 374 375 376 377 378 379 380 381
				if (token != SEMI)
					skip_to_semi (cfile);
				return (unsigned char *)0;
			}
			token = next_token (&val, cfile);
		}
		token = next_token (&val, cfile);

		if (token == EOF) {
382
			parse_warn (cfile, "unexpected end of file");
383 384 385 386 387 388
			break;
		}

		/* Allow NUMBER_OR_NAME if base is 16. */
		if (token != NUMBER &&
		    (base != 16 || token != NUMBER_OR_NAME)) {
389
			parse_warn (cfile, "expecting numeric value.");
390 391 392 393 394 395
			skip_to_semi (cfile);
			return (unsigned char *)0;
		}
		/* If we can, convert the number now; otherwise, build
		   a linked list of all the numbers. */
		if (s) {
396
			convert_num (cfile, s, val, base, size);
397 398
			s += size / 8;
		} else {
Ted Lemon's avatar
Ted Lemon committed
399
			t = (unsigned char *)dmalloc (strlen (val) + 1, MDL);
400
			if (!t)
401
				log_fatal ("no temp space for number.");
402 403
			strcpy ((char *)t, val);
			c = cons ((caddr_t)t, c);
404 405 406 407 408
		}
	} while (++count != *max);

	/* If we had to cons up a list, convert it now. */
	if (c) {
Ted Lemon's avatar
Ted Lemon committed
409
		bufp = (unsigned char *)dmalloc (count * size / 8, MDL);
410
		if (!bufp)
411
			log_fatal ("no space for numeric aggregate.");
412 413 414 415 416
		s = bufp + count - size / 8;
		*max = count;
	}
	while (c) {
		pair cdr = c -> cdr;
417
		convert_num (cfile, s, (char *)(c -> car), base, size);
418 419
		s -= size / 8;
		/* Free up temp space. */
Ted Lemon's avatar
Ted Lemon committed
420 421
		dfree (c -> car, MDL);
		dfree (c, MDL);
422 423 424 425 426
		c = cdr;
	}
	return bufp;
}

427 428
void convert_num (cfile, buf, str, base, size)
	struct parse *cfile;
429
	unsigned char *buf;
430
	const char *str;
431
	int base;
432
	unsigned size;
433
{
434
	const char *ptr = str;
435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471
	int negative = 0;
	u_int32_t val = 0;
	int tval;
	int max;

	if (*ptr == '-') {
		negative = 1;
		++ptr;
	}

	/* If base wasn't specified, figure it out from the data. */
	if (!base) {
		if (ptr [0] == '0') {
			if (ptr [1] == 'x') {
				base = 16;
				ptr += 2;
			} else if (isascii (ptr [1]) && isdigit (ptr [1])) {
				base = 8;
				ptr += 1;
			} else {
				base = 10;
			}
		} else {
			base = 10;
		}
	}

	do {
		tval = *ptr++;
		/* XXX assumes ASCII... */
		if (tval >= 'a')
			tval = tval - 'a' + 10;
		else if (tval >= 'A')
			tval = tval - 'A' + 10;
		else if (tval >= '0')
			tval -= '0';
		else {
472
			parse_warn (cfile, "Bogus number: %s.", str);
473 474 475
			break;
		}
		if (tval >= base) {
476 477
			parse_warn (cfile,
				    "Bogus number %s: digit %d not in base %d",
478
				    str, tval, base);
479 480 481 482 483 484 485 486 487 488 489 490
			break;
		}
		val = val * base + tval;
	} while (*ptr);

	if (negative)
		max = (1 << (size - 1));
	else
		max = (1 << (size - 1)) + ((1 << (size - 1)) - 1);
	if (val > max) {
		switch (base) {
		      case 8:
491
			parse_warn (cfile,
492
				    "%s%lo exceeds max (%d) for precision.",
Ted Lemon's avatar
Ted Lemon committed
493 494
				    negative ? "-" : "",
				    (unsigned long)val, max);
495 496
			break;
		      case 16:
497
			parse_warn (cfile,
498
				    "%s%lx exceeds max (%d) for precision.",
Ted Lemon's avatar
Ted Lemon committed
499 500
				    negative ? "-" : "",
				    (unsigned long)val, max);
501 502
			break;
		      default:
503
			parse_warn (cfile,
504
				    "%s%lu exceeds max (%d) for precision.",
Ted Lemon's avatar
Ted Lemon committed
505 506
				    negative ? "-" : "",
				    (unsigned long)val, max);
507 508 509 510 511 512 513 514 515 516
			break;
		}
	}

	if (negative) {
		switch (size) {
		      case 8:
			*buf = -(unsigned long)val;
			break;
		      case 16:
517
			putShort (buf, -(long)val);
518 519
			break;
		      case 32:
520
			putLong (buf, -(long)val);
521 522
			break;
		      default:
523 524
			parse_warn (cfile,
				    "Unexpected integer size: %d\n", size);
525 526 527 528 529 530 531 532 533 534 535 536 537 538
			break;
		}
	} else {
		switch (size) {
		      case 8:
			*buf = (u_int8_t)val;
			break;
		      case 16:
			putUShort (buf, (u_int16_t)val);
			break;
		      case 32:
			putULong (buf, val);
			break;
		      default:
539 540
			parse_warn (cfile,
				    "Unexpected integer size: %d\n", size);
541 542 543 544 545
			break;
		}
	}
}

546 547
/*
 * date :== NUMBER NUMBER SLASH NUMBER SLASH NUMBER 
548 549 550
 *		NUMBER COLON NUMBER COLON NUMBER SEMI |
 *          NUMBER NUMBER SLASH NUMBER SLASH NUMBER 
 *		NUMBER COLON NUMBER COLON NUMBER NUMBER SEMI |
551
 *	    NEVER
552
 *
553 554 555 556
 * Dates are stored in GMT or with a timezone offset; first number is day
 * of week; next is year/month/day; next is hours:minutes:seconds on a
 * 24-hour clock, followed by the timezone offset in seconds, which is
 * optional.
557
 */
558 559

TIME parse_date (cfile)
560
	struct parse *cfile;
561 562 563
{
	struct tm tm;
	int guess;
564
	int tzoff, wday, year, mon, mday, hour, min, sec;
565
	const char *val;
566
	enum dhcp_token token;
567 568 569
	static int months [11] = { 31, 59, 90, 120, 151, 181,
					  212, 243, 273, 304, 334 };

570
	/* Day of week, or "never"... */
571
	token = next_token (&val, cfile);
572 573 574 575 576 577
	if (token == NEVER) {
		if (!parse_semi (cfile))
			return 0;
		return MAX_TIME;
	}

578
	if (token != NUMBER) {
579
		parse_warn (cfile, "numeric day of week expected.");
580 581 582 583
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
584
	wday = atoi (val);
585 586 587 588

	/* Year... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
589
		parse_warn (cfile, "numeric year expected.");
590 591 592 593
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
594 595 596 597 598

	/* Note: the following is not a Y2K bug - it's a Y1.9K bug.   Until
	   somebody invents a time machine, I think we can safely disregard
	   it.   This actually works around a stupid Y2K bug that was present
	   in a very early beta release of dhcpd. */
599 600 601
	year = atoi (val);
	if (year > 1900)
		year -= 1900;
602 603 604 605

	/* Slash seperating year from month... */
	token = next_token (&val, cfile);
	if (token != SLASH) {
606 607
		parse_warn (cfile,
			    "expected slash seperating year from month.");
608 609 610 611 612 613 614 615
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}

	/* Month... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
616
		parse_warn (cfile, "numeric month expected.");
617 618 619 620
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
621
	mon = atoi (val) - 1;
622 623 624 625

	/* Slash seperating month from day... */
	token = next_token (&val, cfile);
	if (token != SLASH) {
626 627
		parse_warn (cfile,
			    "expected slash seperating month from day.");
628 629 630 631 632 633 634 635
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}

	/* Month... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
636
		parse_warn (cfile, "numeric day of month expected.");
637 638 639 640
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
641
	mday = atoi (val);
642 643 644 645

	/* Hour... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
646
		parse_warn (cfile, "numeric hour expected.");
647 648 649 650
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
651
	hour = atoi (val);
652 653 654 655

	/* Colon seperating hour from minute... */
	token = next_token (&val, cfile);
	if (token != COLON) {
656 657
		parse_warn (cfile,
			    "expected colon seperating hour from minute.");
658 659 660 661 662 663 664 665
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}

	/* Minute... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
666
		parse_warn (cfile, "numeric minute expected.");
667 668 669 670
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
671
	min = atoi (val);
672 673 674 675

	/* Colon seperating minute from second... */
	token = next_token (&val, cfile);
	if (token != COLON) {
676 677
		parse_warn (cfile,
			    "expected colon seperating hour from minute.");
678 679 680 681 682 683 684 685
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}

	/* Minute... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
686
		parse_warn (cfile, "numeric minute expected.");
687 688 689 690
		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
691
	sec = atoi (val);
692

693 694 695 696 697 698
	token = peek_token (&val, cfile);
	if (token == NUMBER) {
		token = next_token (&val, cfile);
		tzoff = atoi (val);
	} else
		tzoff = 0;
699 700

	/* Make sure the date ends in a semicolon... */
Ted Lemon's avatar
Ted Lemon committed
701
	if (!parse_semi (cfile))
702 703 704
		return 0;

	/* Guess the time value... */
705 706 707 708
	guess = ((((((365 * (year - 70) +	/* Days in years since '70 */
		      (year - 69) / 4 +		/* Leap days since '70 */
		      (mon			/* Days in months this year */
		       ? months [mon - 1]
709
		       : 0) +
710 711 712 713 714
		      (mon > 1 &&		/* Leap day this year */
		       !((year - 72) & 3)) +
		      mday - 1) * 24) +		/* Day of month */
		    hour) * 60) +
		  min) * 60) + sec + tzoff;
715 716 717 718 719 720 721 722 723 724 725 726

	/* This guess could be wrong because of leap seconds or other
	   weirdness we don't know about that the system does.   For
	   now, we're just going to accept the guess, but at some point
	   it might be nice to do a successive approximation here to
	   get an exact value.   Even if the error is small, if the
	   server is restarted frequently (and thus the lease database
	   is reread), the error could accumulate into something
	   significant. */

	return guess;
}
727

728 729 730 731 732
/*
 * option-name :== IDENTIFIER |
 		   IDENTIFIER . IDENTIFIER
 */

733
struct option *parse_option_name (cfile, allocate, known)
734
	struct parse *cfile;
735
	int allocate;
736
	int *known;
737
{
738
	const char *val;
739
	enum dhcp_token token;
740
	char *uname;
741 742 743 744 745
	struct universe *universe;
	struct option *option;

	token = next_token (&val, cfile);
	if (!is_identifier (token)) {
746 747
		parse_warn (cfile,
			    "expecting identifier after option keyword.");
748 749 750 751
		if (token != SEMI)
			skip_to_semi (cfile);
		return (struct option *)0;
	}
Ted Lemon's avatar
Ted Lemon committed
752
	uname = dmalloc (strlen (val) + 1, MDL);
753 754 755
	if (!uname)
		log_fatal ("no memory for uname information.");
	strcpy (uname, val);
756 757 758 759 760 761 762 763
	token = peek_token (&val, cfile);
	if (token == DOT) {
		/* Go ahead and take the DOT token... */
		token = next_token (&val, cfile);

		/* The next token should be an identifier... */
		token = next_token (&val, cfile);
		if (!is_identifier (token)) {
764
			parse_warn (cfile, "expecting identifier after '.'");
765 766 767 768 769 770
			if (token != SEMI)
				skip_to_semi (cfile);
			return (struct option *)0;
		}

		/* Look up the option name hash table for the specified
771
		   uname. */
772 773
		universe = ((struct universe *)
			    hash_lookup (&universe_hash,
774
					 (unsigned char *)uname, 0));
775 776 777
		/* If it's not there, we can't parse the rest of the
		   declaration. */
		if (!universe) {
778
			parse_warn (cfile, "no option space named %s.", uname);
779 780 781 782 783 784
			skip_to_semi (cfile);
			return (struct option *)0;
		}
	} else {
		/* Use the default hash table, which contains all the
		   standard dhcp option names. */
785
		val = uname;
786 787 788 789 790
		universe = &dhcp_universe;
	}

	/* Look up the actual option info... */
	option = (struct option *)hash_lookup (universe -> hash,
791
					       (const unsigned char *)val, 0);
792 793

	/* If we didn't get an option structure, it's an undefined option. */
794 795 796
	if (option) {
		*known = 1;
	} else {
797 798 799 800 801 802 803 804
		/* If we've been told to allocate, that means that this
		   (might) be an option code definition, so we'll create
		   an option structure just in case. */
		if (allocate) {
			option = new_option ("parse_option_name");
			if (val == uname)
				option -> name = val;
			else {
805
				char *s;
Ted Lemon's avatar
Ted Lemon committed
806 807
				dfree (uname, MDL);
				s = dmalloc (strlen (val) + 1, MDL);
808
				if (!s)
809 810
				    log_fatal ("no memory for option %s.%s",
					       universe -> name, val);
811 812
				strcpy (s, val);
				option -> name = s;
813 814
			}
			option -> universe = universe;
815
			option -> code = 0;
816 817 818
			return option;
		}
		if (val == uname)
819
			parse_warn (cfile, "no option named %s", val);
820
		else
821
			parse_warn (cfile, "no option named %s in space %s",
822
				    val, uname);
823 824 825 826 827
		skip_to_semi (cfile);
		return (struct option *)0;
	}

	/* Free the initial identifier token. */
Ted Lemon's avatar
Ted Lemon committed
828
	dfree (uname, MDL);
829 830 831
	return option;
}

832 833 834
/* IDENTIFIER SEMI */

void parse_option_space_decl (cfile)
835
	struct parse *cfile;
836 837
{
	int token;
838
	const char *val;
839
	struct universe **ua, *nu;
840
	char *s;
841 842 843 844 845

	next_token (&val, cfile);	/* Discard the SPACE token, which was
					   checked by the caller. */
	token = next_token (&val, cfile);
	if (!is_identifier (token)) {
846
		parse_warn (cfile, "expecting identifier.");
847 848 849 850 851 852 853 854
		skip_to_semi (cfile);
		return;
	}
	nu = new_universe ("parse_option_space_decl");
	if (!nu)
		log_fatal ("No memory for new option space.");

	/* Set up the server option universe... */
Ted Lemon's avatar
Ted Lemon committed
855
	s = dmalloc (strlen (val) + 1, MDL);
856
	if (!s)
857
		log_fatal ("No memory for new option space name.");
858 859
	strcpy (s, val);
	nu -> name = s;
860 861 862 863 864 865 866 867 868 869 870 871 872 873
	nu -> lookup_func = lookup_hashed_option;
	nu -> option_state_dereference =
		hashed_option_state_dereference;
	nu -> get_func = hashed_option_get;
	nu -> set_func = hashed_option_set;
	nu -> save_func = save_hashed_option;
	nu -> delete_func = delete_hashed_option;
	nu -> encapsulate = hashed_option_space_encapsulate;
	nu -> length_size = 1;
	nu -> tag_size = 1;
	nu -> store_tag = putUChar;
	nu -> store_length = putUChar;
	nu -> index = universe_count++;
	if (nu -> index >= universe_max) {
Ted Lemon's avatar
Ted Lemon committed
874
		ua = dmalloc (universe_max * 2 * sizeof *ua, MDL);
875 876 877 878
		if (!ua)
			log_fatal ("No memory to expand option space array.");
		memcpy (ua, universes, universe_max * sizeof *ua);
		universe_max *= 2;
Ted Lemon's avatar
Ted Lemon committed
879
		dfree (universes, MDL);
880 881 882 883 884 885 886
		universes = ua;
	}
	universes [nu -> index] = nu;
	nu -> hash = new_hash ();
	if (!nu -> hash)
		log_fatal ("Can't allocate %s option hash table.", nu -> name);
	add_hash (&universe_hash,
887
		  (const unsigned char *)nu -> name, 0, (unsigned char *)nu);
888 889 890
	parse_semi (cfile);
}

891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
/* This is faked up to look good right now.   Ideally, this should do a
   recursive parse and allow arbitrary data structure definitions, but for
   now it just allows you to specify a single type, an array of single types,
   a sequence of types, or an array of sequences of types.

   ocd :== NUMBER EQUALS ocsd SEMI

   ocsd :== ocsd_type |
	    ocsd_type_sequence |
	    ARRAY OF ocsd_type |
	    ARRAY OF ocsd_type_sequence

   ocsd_type :== BOOLEAN |
		 INTEGER NUMBER |
		 SIGNED INTEGER NUMBER |
		 UNSIGNED INTEGER NUMBER |
		 IP-ADDRESS |
		 TEXT |
		 STRING

   ocsd_type_sequence :== LBRACE ocsd_types RBRACE

   ocsd_type :== ocsd_type |
		 ocsd_types ocsd_type */

int parse_option_code_definition (cfile, option)
917
	struct parse *cfile;
918 919
	struct option *option;
{
920
	const char *val;
921
	enum dhcp_token token;
922
	unsigned arrayp = 0;
923 924 925
	int recordp = 0;
	int no_more_in_record = 0;
	char tokbuf [128];
926
	unsigned tokix = 0;
927 928 929
	char type;
	int code;
	int is_signed;
930
	char *s;
931 932 933 934
	
	/* Parse the option code. */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
935
		parse_warn (cfile, "expecting option code number.");
936 937 938 939 940 941 942
		skip_to_semi (cfile);
		return 0;
	}
	option -> code = atoi (val);

	token = next_token (&val, cfile);
	if (token != EQUAL) {
943
		parse_warn (cfile, "expecting \"=\"");
944 945 946 947 948 949 950 951 952
		skip_to_semi (cfile);
		return 0;
	}

	/* See if this is an array. */
	token = next_token (&val, cfile);
	if (token == ARRAY) {
		token = next_token (&val, cfile);
		if (token != OF) {
953
			parse_warn (cfile, "expecting \"of\".");
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976
			skip_to_semi (cfile);
			return 0;
		}
		arrayp = 1;
		token = next_token (&val, cfile);
	}

	if (token == LBRACE) {
		recordp = 1;
		token = next_token (&val, cfile);
	}

	/* At this point we're expecting a data type. */
      next_type:
	switch (token) {
	      case BOOLEAN:
		type = 'f';
		break;
	      case INTEGER:
		is_signed = 1;
	      parse_integer:
		token = next_token (&val, cfile);
		if (token != NUMBER) {
977
			parse_warn (cfile, "expecting number.");
978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993
			skip_to_rbrace (cfile, recordp);
			if (recordp)
				skip_to_semi (cfile);
			return 0;
		}
		switch (atoi (val)) {
		      case 8:
			type = is_signed ? 'b' : 'B';
			break;
		      case 16:
			type = is_signed ? 's' : 'S';
			break;
		      case 32:
			type = is_signed ? 'l' : 'L';
			break;
		      default:
994 995
			parse_warn (cfile,
				    "%s bit precision is not supported.", val);
996 997 998 999 1000 1001 1002 1003 1004 1005 1006
			skip_to_rbrace (cfile, recordp);
			if (recordp)
				skip_to_semi (cfile);
			return 0;
		}
		break;
	      case SIGNED:
		is_signed = 1;
	      parse_signed:
		token = next_token (&val, cfile);
		if (token != INTEGER) {
1007
			parse_warn (cfile, "expecting \"integer\" keyword.");
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
			skip_to_rbrace (cfile, recordp);
			if (recordp)
				skip_to_semi (cfile);
			return 0;
		}
		goto parse_integer;
	      case UNSIGNED:
		is_signed = 0;
		goto parse_signed;

	      case IP_ADDRESS:
		type = 'I';
		break;
	      case TEXT:
		type = 't';
	      no_arrays:
		if (arrayp) {
1025
			parse_warn (cfile, "arrays of text strings not %s",
1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
				    "yet supported.");
			skip_to_rbrace (cfile, recordp);
			if (recordp)
				skip_to_semi (cfile);
			return 0;
		}
		no_more_in_record = 1;
		break;
	      case STRING:
		type = 'X';
		goto no_arrays;

	      default:
1039
		parse_warn (cfile, "unknown data type %s", val);
1040 1041 1042 1043 1044 1045 1046
		skip_to_rbrace (cfile, recordp);
		if (recordp)
			skip_to_semi (cfile);
		return 0;
	}

	if (tokix == sizeof tokbuf) {
1047
		parse_warn (cfile, "too many types in record.");
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
		skip_to_rbrace (cfile, recordp);
		if (recordp)
			skip_to_semi (cfile);
		return 0;
	}
	tokbuf [tokix++] = type;

	if (recordp) {
		token = next_token (&val, cfile);
		if (token == COMMA) {
			if (no_more_in_record) {
1059 1060
				parse_warn (cfile,
					    "%s must be at end of record.",
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
					    type == 't' ? "text" : "string");
				skip_to_rbrace (cfile, 1);
				if (recordp)
					skip_to_semi (cfile);
				return 0;
			}
			token = next_token (&val, cfile);
			goto next_type;
		}
		if (token != RBRACE) {
1071
			parse_warn (cfile, "expecting right brace.");
1072 1073 1074 1075 1076 1077 1078
			skip_to_rbrace (cfile, 1);
			if (recordp)
				skip_to_semi (cfile);
			return 0;
		}
	}
	if (!parse_semi (cfile)) {
1079
		parse_warn (cfile, "semicolon expected.");