parse.c 85.5 KB
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/* parse.c

   Common parser code for dhcpd and dhclient. */

/*
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 * 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:
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 *
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 *             http://www.isc.org/isc-license-1.0.html. 
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 *
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 * 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.
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 *
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 * Support and other services are available for ISC products - see
 * http://www.isc.org for more information.
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 */

#ifndef lint
static char copyright[] =
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"$Id: parse.c,v 1.64 2000/02/15 19:41:01 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.  All rights reserved.\n";
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#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)
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	struct parse *cfile;
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{
	skip_to_rbrace (cfile, 0);
}

void skip_to_rbrace (cfile, brace_count)
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	struct parse *cfile;
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	int brace_count;
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{
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	enum dhcp_token token;
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	const char *val;
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#if defined (DEBUG_TOKEN)
	log_error ("skip_to_rbrace: %d\n", brace_count);
#endif
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	do {
		token = peek_token (&val, cfile);
		if (token == RBRACE) {
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			token = next_token (&val, cfile);
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			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;
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		} 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;
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		}
		token = next_token (&val, cfile);
	} while (token != EOF);
}

int parse_semi (cfile)
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	struct parse *cfile;
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{
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	enum dhcp_token token;
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	const char *val;
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	token = next_token (&val, cfile);
	if (token != SEMI) {
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		parse_warn (cfile, "semicolon expected.");
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		skip_to_semi (cfile);
		return 0;
	}
	return 1;
}

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

char *parse_string (cfile)
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	struct parse *cfile;
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{
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	const char *val;
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	enum dhcp_token token;
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	char *s;

	token = next_token (&val, cfile);
	if (token != STRING) {
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		parse_warn (cfile, "filename must be a string");
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		skip_to_semi (cfile);
		return (char *)0;
	}
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	s = (char *)dmalloc (strlen (val) + 1, MDL);
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	if (!s)
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		log_fatal ("no memory for string %s.", val);
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	strcpy (s, val);

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

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/*
 * hostname :== IDENTIFIER
 *		| IDENTIFIER DOT
 *		| hostname DOT IDENTIFIER
 */
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char *parse_host_name (cfile)
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	struct parse *cfile;
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{
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	const char *val;
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	enum dhcp_token token;
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	unsigned len = 0;
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	char *s;
	char *t;
	pair c = (pair)0;
	
	/* Read a dotted hostname... */
	do {
		/* Read a token, which should be an identifier. */
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		token = peek_token (&val, cfile);
		if (!is_identifier (token) && token != NUMBER)
			break;
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		token = next_token (&val, cfile);
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		/* Store this identifier... */
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		if (!(s = (char *)dmalloc (strlen (val) + 1, MDL)))
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			log_fatal ("can't allocate temp space for hostname.");
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		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. */
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	if (!(s = (char *)dmalloc (len, MDL)))
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		log_fatal ("can't allocate space for hostname.");
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	t = s + len;
	*--t = 0;
	while (c) {
		pair cdr = c -> cdr;
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		unsigned l = strlen ((char *)(c -> car));
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		t -= l;
		memcpy (t, (char *)(c -> car), l);
		/* Free up temp space. */
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		dfree (c -> car, MDL);
		dfree (c, MDL);
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		c = cdr;
		if (t != s)
			*--t = '.';
	}
	return s;
}

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/* 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. */

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int parse_ip_addr_or_hostname (expr, cfile, uniform)
	struct expression **expr;
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	struct parse *cfile;
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	int uniform;
{
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	const char *val;
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	enum dhcp_token token;
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	unsigned char addr [4];
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	unsigned len = sizeof addr;
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	char *name;
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	struct expression *x = (struct expression *)0;
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	token = peek_token (&val, cfile);
	if (is_identifier (token)) {
		name = parse_host_name (cfile);
		if (!name)
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			return 0;
		if (!make_host_lookup (expr, name))
			return 0;
		if (!uniform) {
			if (!make_limit (&x, *expr, 4))
				return 0;
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			expression_dereference (expr, MDL);
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			*expr = x;
		}
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	} else if (token == NUMBER) {
		if (!parse_numeric_aggregate (cfile, addr, &len, DOT, 10, 8))
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			return 0;
		return make_const_data (expr, addr, len, 0, 1);
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	} else {
		if (token != RBRACE && token != LBRACE)
			token = next_token (&val, cfile);
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		parse_warn (cfile, "%s (%d): expecting IP address or hostname",
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			    val, token);
		if (token != SEMI)
			skip_to_semi (cfile);
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		return 0;
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	}

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	return 1;
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}	
	
/*
 * ip-address :== NUMBER DOT NUMBER DOT NUMBER DOT NUMBER
 */

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int parse_ip_addr (cfile, addr)
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	struct parse *cfile;
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	struct iaddr *addr;
{
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	const char *val;
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	enum dhcp_token token;
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	addr -> len = 4;
	if (parse_numeric_aggregate (cfile, addr -> iabuf,
				     &addr -> len, DOT, 10, 8))
		return 1;
	return 0;
}	

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/*
 * hardware-parameter :== HARDWARE hardware-type colon-seperated-hex-list SEMI
 * hardware-type :== ETHERNET | TOKEN_RING
 */
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void parse_hardware_param (cfile, hardware)
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	struct parse *cfile;
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	struct hardware *hardware;
{
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	const char *val;
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	enum dhcp_token token;
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	unsigned hlen;
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	unsigned char *t;

	token = next_token (&val, cfile);
	switch (token) {
	      case ETHERNET:
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		hardware -> hbuf [0] = HTYPE_ETHER;
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		break;
	      case TOKEN_RING:
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		hardware -> hbuf [0] = HTYPE_IEEE802;
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		break;
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	      case FDDI:
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		hardware -> hbuf [0] = HTYPE_FDDI;
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		break;
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	      default:
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		parse_warn (cfile, "expecting a network hardware type");
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		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;
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	if (hlen + 1 > sizeof hardware -> hbuf) {
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		dfree (t, MDL);
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		parse_warn (cfile, "hardware address too long");
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	} else {
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		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);
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		dfree (t, MDL);
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	}
	
	token = next_token (&val, cfile);
	if (token != SEMI) {
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		parse_warn (cfile, "expecting semicolon.");
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		skip_to_semi (cfile);
	}
}

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

void parse_lease_time (cfile, timep)
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	struct parse *cfile;
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	TIME *timep;
{
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	const char *val;
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	enum dhcp_token token;
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	token = next_token (&val, cfile);
	if (token != NUMBER) {
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		parse_warn (cfile, "Expecting numeric lease time");
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		skip_to_semi (cfile);
		return;
	}
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	convert_num (cfile, (unsigned char *)timep, val, 10, 32);
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	/* 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)
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	struct parse *cfile;
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	unsigned char *buf;
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	unsigned *max;
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	int seperator;
	int base;
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	unsigned size;
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{
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	const char *val;
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	enum dhcp_token token;
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	unsigned char *bufp = buf, *s, *t;
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	unsigned count = 0;
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	pair c = (pair)0;

	if (!bufp && *max) {
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		bufp = (unsigned char *)dmalloc (*max * size / 8, MDL);
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		if (!bufp)
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			log_fatal ("no space for numeric aggregate");
		s = 0;
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	} 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);
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				parse_warn (cfile, "too few numbers.");
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				if (token != SEMI)
					skip_to_semi (cfile);
				return (unsigned char *)0;
			}
			token = next_token (&val, cfile);
		}
		token = next_token (&val, cfile);

		if (token == EOF) {
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			parse_warn (cfile, "unexpected end of file");
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			break;
		}

		/* Allow NUMBER_OR_NAME if base is 16. */
		if (token != NUMBER &&
		    (base != 16 || token != NUMBER_OR_NAME)) {
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			parse_warn (cfile, "expecting numeric value.");
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			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) {
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			convert_num (cfile, s, val, base, size);
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			s += size / 8;
		} else {
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			t = (unsigned char *)dmalloc (strlen (val) + 1, MDL);
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			if (!t)
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				log_fatal ("no temp space for number.");
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			strcpy ((char *)t, val);
			c = cons ((caddr_t)t, c);
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		}
	} while (++count != *max);

	/* If we had to cons up a list, convert it now. */
	if (c) {
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		bufp = (unsigned char *)dmalloc (count * size / 8, MDL);
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		if (!bufp)
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			log_fatal ("no space for numeric aggregate.");
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		s = bufp + count - size / 8;
		*max = count;
	}
	while (c) {
		pair cdr = c -> cdr;
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		convert_num (cfile, s, (char *)(c -> car), base, size);
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		s -= size / 8;
		/* Free up temp space. */
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		dfree (c -> car, MDL);
		dfree (c, MDL);
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		c = cdr;
	}
	return bufp;
}

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void convert_num (cfile, buf, str, base, size)
	struct parse *cfile;
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	unsigned char *buf;
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	const char *str;
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	int base;
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	unsigned size;
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{
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	const char *ptr = str;
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	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 {
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			parse_warn (cfile, "Bogus number: %s.", str);
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			break;
		}
		if (tval >= base) {
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			parse_warn (cfile,
				    "Bogus number %s: digit %d not in base %d",
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				    str, tval, base);
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			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:
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			parse_warn (cfile,
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				    "%s%lo exceeds max (%d) for precision.",
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				    negative ? "-" : "",
				    (unsigned long)val, max);
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			break;
		      case 16:
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			parse_warn (cfile,
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				    "%s%lx exceeds max (%d) for precision.",
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				    negative ? "-" : "",
				    (unsigned long)val, max);
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			break;
		      default:
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			parse_warn (cfile,
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				    "%s%lu exceeds max (%d) for precision.",
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				    negative ? "-" : "",
				    (unsigned long)val, max);
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			break;
		}
	}

	if (negative) {
		switch (size) {
		      case 8:
			*buf = -(unsigned long)val;
			break;
		      case 16:
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			putShort (buf, -(long)val);
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			break;
		      case 32:
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			putLong (buf, -(long)val);
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			break;
		      default:
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			parse_warn (cfile,
				    "Unexpected integer size: %d\n", size);
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			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:
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			parse_warn (cfile,
				    "Unexpected integer size: %d\n", size);
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			break;
		}
	}
}

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/*
 * date :== NUMBER NUMBER SLASH NUMBER SLASH NUMBER 
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 *		NUMBER COLON NUMBER COLON NUMBER SEMI |
 *          NUMBER NUMBER SLASH NUMBER SLASH NUMBER 
 *		NUMBER COLON NUMBER COLON NUMBER NUMBER SEMI |
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 *	    NEVER
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 *
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 * 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.
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 */
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TIME parse_date (cfile)
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	struct parse *cfile;
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{
	struct tm tm;
	int guess;
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	int tzoff, wday, year, mon, mday, hour, min, sec;
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	const char *val;
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	enum dhcp_token token;
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	static int months [11] = { 31, 59, 90, 120, 151, 181,
					  212, 243, 273, 304, 334 };

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	/* Day of week, or "never"... */
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	token = next_token (&val, cfile);
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	if (token == NEVER) {
		if (!parse_semi (cfile))
			return 0;
		return MAX_TIME;
	}

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	if (token != NUMBER) {
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		parse_warn (cfile, "numeric day of week expected.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
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	wday = atoi (val);
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	/* Year... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
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		parse_warn (cfile, "numeric year expected.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
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	/* 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. */
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	year = atoi (val);
	if (year > 1900)
		year -= 1900;
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	/* Slash seperating year from month... */
	token = next_token (&val, cfile);
	if (token != SLASH) {
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		parse_warn (cfile,
			    "expected slash seperating year from month.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}

	/* Month... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
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		parse_warn (cfile, "numeric month expected.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
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	mon = atoi (val) - 1;
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	/* Slash seperating month from day... */
	token = next_token (&val, cfile);
	if (token != SLASH) {
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		parse_warn (cfile,
			    "expected slash seperating month from day.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}

	/* Month... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
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		parse_warn (cfile, "numeric day of month expected.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
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	mday = atoi (val);
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	/* Hour... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
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		parse_warn (cfile, "numeric hour expected.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
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	hour = atoi (val);
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	/* Colon seperating hour from minute... */
	token = next_token (&val, cfile);
	if (token != COLON) {
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		parse_warn (cfile,
			    "expected colon seperating hour from minute.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}

	/* Minute... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
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		parse_warn (cfile, "numeric minute expected.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
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	min = atoi (val);
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	/* Colon seperating minute from second... */
	token = next_token (&val, cfile);
	if (token != COLON) {
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		parse_warn (cfile,
			    "expected colon seperating hour from minute.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}

	/* Minute... */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
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		parse_warn (cfile, "numeric minute expected.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (TIME)0;
	}
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	sec = atoi (val);
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	token = peek_token (&val, cfile);
	if (token == NUMBER) {
		token = next_token (&val, cfile);
		tzoff = atoi (val);
	} else
		tzoff = 0;
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	/* Make sure the date ends in a semicolon... */
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	if (!parse_semi (cfile))
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		return 0;

	/* Guess the time value... */
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	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]
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		       : 0) +
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		      (mon > 1 &&		/* Leap day this year */
		       !((year - 72) & 3)) +
		      mday - 1) * 24) +		/* Day of month */
		    hour) * 60) +
		  min) * 60) + sec + tzoff;
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	/* 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;
}
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/*
 * option-name :== IDENTIFIER |
 		   IDENTIFIER . IDENTIFIER
 */

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struct option *parse_option_name (cfile, allocate, known)
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	struct parse *cfile;
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	int allocate;
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	int *known;
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{
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	const char *val;
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	enum dhcp_token token;
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	char *uname;
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	struct universe *universe;
	struct option *option;

	token = next_token (&val, cfile);
	if (!is_identifier (token)) {
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		parse_warn (cfile,
			    "expecting identifier after option keyword.");
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		if (token != SEMI)
			skip_to_semi (cfile);
		return (struct option *)0;
	}
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	uname = dmalloc (strlen (val) + 1, MDL);
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	if (!uname)
		log_fatal ("no memory for uname information.");
	strcpy (uname, val);
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	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)) {
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			parse_warn (cfile, "expecting identifier after '.'");
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			if (token != SEMI)
				skip_to_semi (cfile);
			return (struct option *)0;
		}

		/* Look up the option name hash table for the specified
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		   uname. */
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		universe = ((struct universe *)
			    hash_lookup (&universe_hash,
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					 (unsigned char *)uname, 0));
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		/* If it's not there, we can't parse the rest of the
		   declaration. */
		if (!universe) {
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			parse_warn (cfile, "no option space named %s.", uname);
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			skip_to_semi (cfile);
			return (struct option *)0;
		}
	} else {
		/* Use the default hash table, which contains all the
		   standard dhcp option names. */
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		val = uname;
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		universe = &dhcp_universe;
	}

	/* Look up the actual option info... */
	option = (struct option *)hash_lookup (universe -> hash,
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					       (const unsigned char *)val, 0);
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	/* If we didn't get an option structure, it's an undefined option. */
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	if (option) {
		*known = 1;
	} else {
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		/* 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) {
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			option = new_option (MDL);
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			if (val == uname)
				option -> name = val;
			else {
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				char *s;
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				dfree (uname, MDL);
				s = dmalloc (strlen (val) + 1, MDL);
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				if (!s)
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				    log_fatal ("no memory for option %s.%s",
					       universe -> name, val);
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				strcpy (s, val);
				option -> name = s;
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			}
			option -> universe = universe;
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			option -> code = 0;
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			return option;
		}
		if (val == uname)
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			parse_warn (cfile, "no option named %s", val);
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		else
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			parse_warn (cfile, "no option named %s in space %s",
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				    val, uname);
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		skip_to_semi (cfile);
		return (struct option *)0;
	}

	/* Free the initial identifier token. */
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	dfree (uname, MDL);
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	return option;
}

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/* IDENTIFIER SEMI */

void parse_option_space_decl (cfile)
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	struct parse *cfile;
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{
	int token;
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	const char *val;
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	struct universe **ua, *nu;
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	char *s;
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	next_token (&val, cfile);	/* Discard the SPACE token, which was
					   checked by the caller. */
	token = next_token (&val, cfile);
	if (!is_identifier (token)) {
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		parse_warn (cfile, "expecting identifier.");
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		skip_to_semi (cfile);
		return;
	}
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	nu = new_universe (MDL);
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	if (!nu)
		log_fatal ("No memory for new option space.");

	/* Set up the server option universe... */
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	s = dmalloc (strlen (val) + 1, MDL);
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	if (!s)
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		log_fatal ("No memory for new option space name.");
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	strcpy (s, val);
	nu -> name = s;
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	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) {
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		ua = dmalloc (universe_max * 2 * sizeof *ua, MDL);
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		if (!ua)
			log_fatal ("No memory to expand option space array.");
		memcpy (ua, universes, universe_max * sizeof *ua);
		universe_max *= 2;
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		dfree (universes, MDL);
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		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,
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		  (const unsigned char *)nu -> name, 0, (unsigned char *)nu);
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	parse_semi (cfile);
}

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/* 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)
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	struct parse *cfile;
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	struct option *option;
{
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	const char *val;
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	enum dhcp_token token;
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	unsigned arrayp = 0;
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	int recordp = 0;
	int no_more_in_record = 0;
	char tokbuf [128];
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	unsigned tokix = 0;
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	char type;
	int code;
	int is_signed;
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	char *s;
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	/* Parse the option code. */
	token = next_token (&val, cfile);
	if (token != NUMBER) {
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		parse_warn (cfile, "expecting option code number.");
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		skip_to_semi (cfile);
		return 0;
	}
	option -> code = atoi (val);

	token = next_token (&val, cfile);
	if (token != EQUAL) {
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		parse_warn (cfile, "expecting \"=\"");
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		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) {
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			parse_warn (cfile, "expecting \"of\".");
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			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) {
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			parse_warn (cfile, "expecting number.");
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			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:
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			parse_warn (cfile,
				    "%s bit precision is not supported.", val);
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			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) {
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			parse_warn (cfile, "expecting \"integer\" keyword.");
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			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) {
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			parse_warn (cfile, "arrays of text strings not %s",
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				    "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:
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		parse_warn (cfile, "unknown data type %s", val);
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		skip_to_rbrace (cfile, recordp);
		if (recordp)
			skip_to_semi (cfile);
		return 0;
	}

	if (tokix == sizeof tokbuf) {
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		parse_warn (cfile, "too many types in record.");
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		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) {
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				parse_warn (cfile,
					    "%s must be at end of record.",
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					    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) {