301 lines
6.8 KiB
C
301 lines
6.8 KiB
C
/* $OpenBSD: parse.c,v 1.83 2019/07/22 17:20:06 krw Exp $ */
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/* Common parser code for dhcpd and dhclient. */
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/*
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* Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <vis.h>
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#include "dhcp.h"
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#include "dhcpd.h"
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#include "dhctoken.h"
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#include "log.h"
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/*
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* Skip to the semicolon ending the current statement. If we encounter
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* braces, the matching closing brace terminates the statement. If we
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* encounter a right brace but haven't encountered a left brace, return
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* leaving the brace in the token buffer for the caller. If we see a
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* semicolon and haven't seen a left brace, return. This lets us skip
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* over:
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*
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* statement;
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* statement foo bar { }
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* statement foo bar { statement { } }
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* statement}
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*
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* ...et cetera.
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*/
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void
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skip_to_semi(FILE *cfile)
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{
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int token;
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int brace_count = 0;
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do {
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token = peek_token(NULL, cfile);
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if (token == '}') {
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if (brace_count > 0) {
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if (--brace_count == 0) {
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token = next_token(NULL, cfile);
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return;
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}
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} else
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return;
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} else if (token == '{') {
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brace_count++;
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} else if (token == ';' && brace_count == 0) {
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token = next_token(NULL, cfile);
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return;
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}
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token = next_token(NULL, cfile);
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} while (token != EOF);
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}
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int
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parse_semi(FILE *cfile)
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{
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int token;
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token = next_token(NULL, cfile);
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if (token == ';')
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return 1;
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parse_warn("expecting semicolon.");
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skip_to_semi(cfile);
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return 0;
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}
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int
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parse_string(FILE *cfile, char **string)
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{
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static char unvisbuf[1500];
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char *val;
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int i, token;
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token = next_token(&val, cfile);
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if (token == TOK_STRING) {
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i = strnunvis(unvisbuf, val, sizeof(unvisbuf));
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if (i >= 0) {
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*string = strdup(unvisbuf);
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if (*string == NULL)
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fatal("strdup(unvisbuf)");
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return 1;
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}
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}
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parse_warn("expecting string.");
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if (token != ';')
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skip_to_semi(cfile);
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return 0;
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}
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/*
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* cidr :== ip-address "/" bit-count
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* ip-address :== NUMBER [ DOT NUMBER [ DOT NUMBER [ DOT NUMBER ] ] ]
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* bit-count :== 0..32
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*/
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int
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parse_cidr(FILE *cfile, unsigned char *cidr)
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{
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uint8_t buf[5];
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const char *errstr;
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char *val;
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long long numval;
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unsigned int i;
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int token;
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memset(buf, 0, sizeof(buf));
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i = 1; /* Last four octets hold subnet, first octet the # of bits. */
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do {
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token = next_token(&val, cfile);
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if (i == 0)
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numval = strtonum(val, 0, 32, &errstr);
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else
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numval = strtonum(val, 0, UINT8_MAX, &errstr);
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if (errstr != NULL)
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break;
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buf[i++] = numval;
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if (i == 1) {
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memcpy(cidr, buf, sizeof(buf)); /* XXX Need cidr_t */
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return 1;
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}
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token = next_token(NULL, cfile);
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if (token == '/')
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i = 0;
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if (i == sizeof(buf))
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break;
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} while (token == '.' || token == '/');
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parse_warn("expecting IPv4 CIDR block.");
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if (token != ';')
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skip_to_semi(cfile);
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return 0;
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}
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int
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parse_ip_addr(FILE *cfile, struct in_addr *addr)
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{
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struct in_addr buf;
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const char *errstr;
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char *val;
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long long numval;
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unsigned int i;
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int token;
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i = 0;
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do {
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token = next_token(&val, cfile);
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numval = strtonum(val, 0, UINT8_MAX, &errstr);
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if (errstr != NULL)
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break;
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((uint8_t *)&buf)[i++] = numval;
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if (i == sizeof(buf)) {
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memcpy(addr, &buf, sizeof(*addr));
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return 1;
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}
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token = next_token(NULL, cfile);
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} while (token == '.');
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parse_warn("expecting IPv4 address.");
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if (token != ';')
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skip_to_semi(cfile);
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return 0;
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}
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int
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parse_boolean(FILE *cfile, unsigned char *buf)
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{
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char *val;
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int token;
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token = next_token(&val, cfile);
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if (is_identifier(token) != 0) {
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if (strcasecmp(val, "true") == 0 ||
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strcasecmp(val, "on") == 0) {
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buf[0] = 1;
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return 1;
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}
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if (strcasecmp(val, "false") == 0 ||
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strcasecmp(val, "off") == 0) {
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buf[0] = 0;
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return 1;
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}
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}
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parse_warn("expecting boolean.");
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if (token != ';')
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skip_to_semi(cfile);
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return 0;
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}
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int
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parse_number(FILE *cfile, long long *number, long long low, long long high)
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{
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const char *errstr;
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char *val, *msg;
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int rslt, token;
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long long numval;
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token = next_token(&val, cfile);
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numval = strtonum(val, low, high, &errstr);
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if (errstr == NULL) {
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*number = numval;
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return 1;
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}
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rslt = asprintf(&msg, "expecting integer between %lld and %lld", low,
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high);
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if (rslt != -1) {
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parse_warn(msg);
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free(msg);
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}
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if (token != ';')
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skip_to_semi(cfile);
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return 0;
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}
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void
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parse_warn(char *msg)
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{
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static char spaces[81];
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unsigned int i;
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log_warnx("%s: %s line %d: %s", log_procname, tlname, lexline, msg);
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log_warnx("%s: %s", log_procname, token_line);
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if ((unsigned int)lexchar < sizeof(spaces)) {
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memset(spaces, 0, sizeof(spaces));
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for (i = 0; (int)i < lexchar - 1; i++) {
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if (token_line[i] == '\t')
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spaces[i] = '\t';
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else
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spaces[i] = ' ';
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}
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log_warnx("%s: %s^", log_procname, spaces);
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}
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}
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