1 /* $OpenBSD: src/sbin/dhclient/parse.c,v 1.19 2010/06/26 21:14:10 krw Exp $ */
3 /* Common parser code for dhcpd and dhclient. */
6 * Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of The Internet Software Consortium nor the names
19 * of its contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
23 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
24 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
27 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
29 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
30 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
31 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * This software has been written for the Internet Software Consortium
37 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
38 * Enterprises. To learn more about the Internet Software Consortium,
39 * see ``http://www.vix.com/isc''. To learn more about Vixie
40 * Enterprises, see ``http://www.vix.com''.
47 * Skip to the semicolon ending the current statement. If we encounter
48 * braces, the matching closing brace terminates the statement. If we
49 * encounter a right brace but haven't encountered a left brace, return
50 * leaving the brace in the token buffer for the caller. If we see a
51 * semicolon and haven't seen a left brace, return. This lets us skip
55 * statement foo bar { }
56 * statement foo bar { statement { } }
62 skip_to_semi(FILE *cfile)
69 token = peek_token(&val, cfile);
72 token = next_token(&val, cfile);
77 } else if (token == '{') {
79 } else if (token == ';' && !brace_count) {
80 token = next_token(&val, cfile);
82 } else if (token == '\n') {
84 * EOL only happens when parsing
85 * /etc/resolv.conf, and we treat it like a
86 * semicolon because the resolv.conf file is
89 token = next_token(&val, cfile);
92 token = next_token(&val, cfile);
93 } while (token != EOF);
97 parse_semi(FILE *cfile)
102 token = next_token(&val, cfile);
104 parse_warn("semicolon expected.");
112 * string-parameter :== STRING SEMI
115 parse_string(FILE *cfile)
120 token = next_token(&val, cfile);
121 if (token != TOK_STRING) {
122 parse_warn("filename must be a string");
128 error("no memory for string %s.", val);
130 if (!parse_semi(cfile)) {
138 parse_ip_addr(FILE *cfile, struct iaddr *addr)
141 return (parse_numeric_aggregate(cfile, addr->iabuf, addr->len, '.',
146 * hardware-parameter :== HARDWARE ETHERNET csns SEMI
147 * csns :== NUMBER | csns COLON NUMBER
150 parse_hardware_param(FILE *cfile, struct hardware *hardware)
155 token = next_token(&val, cfile);
158 hardware->htype = HTYPE_ETHER;
162 hardware->htype = HTYPE_IEEE802;
166 hardware->htype = HTYPE_FDDI;
170 parse_warn("expecting a network hardware type");
175 if (parse_numeric_aggregate(cfile, hardware->haddr, hardware->hlen,
179 token = next_token(&val, cfile);
181 parse_warn("expecting semicolon.");
187 * lease-time :== NUMBER SEMI
190 parse_lease_time(FILE *cfile, time_t *timep)
195 token = next_token(&val, cfile);
196 if (token != TOK_NUMBER) {
197 parse_warn("Expecting numeric lease time");
201 convert_num((unsigned char *)timep, val, 10, 32);
202 /* Unswap the number - convert_num returns stuff in NBO. */
203 *timep = ntohl(*timep); /* XXX */
209 * Parse a sequence of numbers separated by the token specified in separator.
210 * Exactly max numbers are expected.
213 parse_numeric_aggregate(FILE *cfile, unsigned char *buf, int max, int separator,
219 if (buf == NULL || max == 0)
220 error("no space for numeric aggregate");
222 for (count = 0; count < max; count++, buf++) {
223 if (count && (peek_token(&val, cfile) == separator))
224 token = next_token(&val, cfile);
226 token = next_token(&val, cfile);
228 if (token == TOK_NUMBER || (base == 16 && token == TOK_NUMBER_OR_NAME))
229 /* XXX Need to check if conversion was successful. */
230 convert_num(buf, val, base, 8);
236 parse_warn("numeric aggregate too short.");
244 convert_num(unsigned char *buf, char *str, int base, int size)
246 int negative = 0, tval, max;
255 /* If base wasn't specified, figure it out from the data. */
261 } else if (isascii(ptr[1]) && isdigit(ptr[1])) {
272 /* XXX assumes ASCII... */
274 tval = tval - 'a' + 10;
275 else if (tval >= 'A')
276 tval = tval - 'A' + 10;
277 else if (tval >= '0')
280 warning("Bogus number: %s.", str);
284 warning("Bogus number: %s: digit %d not in base %d",
288 val = val * base + tval;
292 max = (1 << (size - 1));
294 max = (1 << (size - 1)) + ((1 << (size - 1)) - 1);
298 warning("value %s%o exceeds max (%d) for precision.",
299 negative ? "-" : "", val, max);
302 warning("value %s%x exceeds max (%d) for precision.",
303 negative ? "-" : "", val, max);
306 warning("value %s%u exceeds max (%d) for precision.",
307 negative ? "-" : "", val, max);
315 *buf = -(unsigned long)val;
318 putShort(buf, -(unsigned long)val);
321 putLong(buf, -(unsigned long)val);
324 warning("Unexpected integer size: %d", size);
330 *buf = (u_int8_t)val;
333 putUShort(buf, (u_int16_t)val);
339 warning("Unexpected integer size: %d", size);
345 * date :== NUMBER NUMBER SLASH NUMBER SLASH NUMBER
346 * NUMBER COLON NUMBER COLON NUMBER SEMI
348 * Dates are always in GMT; first number is day of week; next is
349 * year/month/day; next is hours:minutes:seconds on a 24-hour
353 parse_date(FILE *cfile)
355 static int months[11] = { 31, 59, 90, 120, 151, 181,
356 212, 243, 273, 304, 334 };
362 token = next_token(&val, cfile);
363 if (token != TOK_NUMBER) {
364 parse_warn("numeric day of week expected.");
369 tm.tm_wday = atoi(val);
372 token = next_token(&val, cfile);
373 if (token != TOK_NUMBER) {
374 parse_warn("numeric year expected.");
379 tm.tm_year = atoi(val);
380 if (tm.tm_year > 1900)
383 /* Slash separating year from month... */
384 token = next_token(&val, cfile);
386 parse_warn("expected slash separating year from month.");
393 token = next_token(&val, cfile);
394 if (token != TOK_NUMBER) {
395 parse_warn("numeric month expected.");
400 tm.tm_mon = atoi(val) - 1;
402 /* Slash separating month from day... */
403 token = next_token(&val, cfile);
405 parse_warn("expected slash separating month from day.");
412 token = next_token(&val, cfile);
413 if (token != TOK_NUMBER) {
414 parse_warn("numeric day of month expected.");
419 tm.tm_mday = atoi(val);
422 token = next_token(&val, cfile);
423 if (token != TOK_NUMBER) {
424 parse_warn("numeric hour expected.");
429 tm.tm_hour = atoi(val);
431 /* Colon separating hour from minute... */
432 token = next_token(&val, cfile);
434 parse_warn("expected colon separating hour from minute.");
441 token = next_token(&val, cfile);
442 if (token != TOK_NUMBER) {
443 parse_warn("numeric minute expected.");
448 tm.tm_min = atoi(val);
450 /* Colon separating minute from second... */
451 token = next_token(&val, cfile);
453 parse_warn("expected colon separating minute from second.");
460 token = next_token(&val, cfile);
461 if (token != TOK_NUMBER) {
462 parse_warn("numeric second expected.");
467 tm.tm_sec = atoi(val);
470 /* XXX: We assume that mktime does not use tm_yday. */
473 /* Make sure the date ends in a semicolon... */
474 token = next_token(&val, cfile);
476 parse_warn("semicolon expected.");
481 /* Guess the time value... */
482 guess = ((((((365 * (tm.tm_year - 70) + /* Days in years since '70 */
483 (tm.tm_year - 69) / 4 + /* Leap days since '70 */
484 (tm.tm_mon /* Days in months this year */
485 ? months[tm.tm_mon - 1] : 0) +
486 (tm.tm_mon > 1 && /* Leap day this year */
487 !((tm.tm_year - 72) & 3)) +
488 tm.tm_mday - 1) * 24) + /* Day of month */
489 tm.tm_hour) * 60) + tm.tm_min) * 60) + tm.tm_sec;
492 * This guess could be wrong because of leap seconds or other
493 * weirdness we don't know about that the system does. For
494 * now, we're just going to accept the guess, but at some point
495 * it might be nice to do a successive approximation here to get
496 * an exact value. Even if the error is small, if the server
497 * is restarted frequently (and thus the lease database is
498 * reread), the error could accumulate into something