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734d081ed1
freebsd-skq/sbin/dhclient/conflex.c
pfg bd6fcb16e5 dhclient(1): correct obvious mismatch in get_char(). 
Correct switch between current and previous line buffers when
encountering a carriage return in the input.

CID:		1305719
Obtained from:	OpenBSD (CVS rev. 1.30)
MFC after:	3 days
2016-06-03 03:40:39 +00:00

530 lines
12 KiB
C
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/* $OpenBSD: conflex.c,v 1.7 2004/09/15 19:02:38 deraadt Exp $ */
/* Lexical scanner for dhcpd config file... */
/*
* Copyright (c) 1995, 1996, 1997 The Internet Software Consortium.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The Internet Software Consortium nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This software has been written for the Internet Software Consortium
* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
* Enterprises. To learn more about the Internet Software Consortium,
* see ``http://www.vix.com/isc''. To learn more about Vixie
* Enterprises, see ``http://www.vix.com''.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <ctype.h>
#include "dhcpd.h"
#include "dhctoken.h"
int lexline;
int lexchar;
char *token_line;
char *prev_line;
char *cur_line;
char *tlname;
int eol_token;
static char line1[81];
static char line2[81];
static int lpos;
static int line;
static int tlpos;
static int tline;
static int token;
static int ugflag;
static char *tval;
static char tokbuf[1500];
static int get_char(FILE *);
static int get_token(FILE *);
static void skip_to_eol(FILE *);
static int read_string(FILE *);
static int read_number(int, FILE *);
static int read_num_or_name(int, FILE *);
static int intern(char *, int);
void
new_parse(char *name)
{
tlname = name;
lpos = line = 1;
cur_line = line1;
prev_line = line2;
token_line = cur_line;
cur_line[0] = prev_line[0] = 0;
warnings_occurred = 0;
}
static int
get_char(FILE *cfile)
{
int c = getc(cfile);
if (!ugflag) {
if (c == '\n') {
if (cur_line == line1) {
cur_line = line2;
prev_line = line1;
} else {
cur_line = line1;
prev_line = line2;
}
line++;
lpos = 1;
cur_line[0] = 0;
} else if (c != EOF) {
if (lpos < sizeof(line1)) {
cur_line[lpos - 1] = c;
cur_line[lpos] = 0;
}
lpos++;
}
} else
ugflag = 0;
return (c);
}
static int
get_token(FILE *cfile)
{
int c, ttok;
static char tb[2];
int l, p;
do {
l = line;
p = lpos;
c = get_char(cfile);
if (!(c == '\n' && eol_token) && isascii(c) && isspace(c))
continue;
if (c == '#') {
skip_to_eol(cfile);
continue;
}
if (c == '"') {
lexline = l;
lexchar = p;
ttok = read_string(cfile);
break;
}
if ((isascii(c) && isdigit(c)) || c == '-') {
lexline = l;
lexchar = p;
ttok = read_number(c, cfile);
break;
} else if (isascii(c) && isalpha(c)) {
lexline = l;
lexchar = p;
ttok = read_num_or_name(c, cfile);
break;
} else {
lexline = l;
lexchar = p;
tb[0] = c;
tb[1] = 0;
tval = tb;
ttok = c;
break;
}
} while (1);
return (ttok);
}
int
next_token(char **rval, FILE *cfile)
{
int rv;
if (token) {
if (lexline != tline)
token_line = cur_line;
lexchar = tlpos;
lexline = tline;
rv = token;
token = 0;
} else {
rv = get_token(cfile);
token_line = cur_line;
}
if (rval)
*rval = tval;
return (rv);
}
int
peek_token(char **rval, FILE *cfile)
{
int x;
if (!token) {
tlpos = lexchar;
tline = lexline;
token = get_token(cfile);
if (lexline != tline)
token_line = prev_line;
x = lexchar;
lexchar = tlpos;
tlpos = x;
x = lexline;
lexline = tline;
tline = x;
}
if (rval)
*rval = tval;
return (token);
}
static void
skip_to_eol(FILE *cfile)
{
int c;
do {
c = get_char(cfile);
if (c == EOF)
return;
if (c == '\n')
return;
} while (1);
}
static int
read_string(FILE *cfile)
{
int i, c, bs = 0;
for (i = 0; i < sizeof(tokbuf); i++) {
c = get_char(cfile);
if (c == EOF) {
parse_warn("eof in string constant");
break;
}
if (bs) {
bs = 0;
i--;
tokbuf[i] = c;
} else if (c == '\\')
bs = 1;
else if (c == '"')
break;
else
tokbuf[i] = c;
}
/*
* Normally, I'd feel guilty about this, but we're talking about
* strings that'll fit in a DHCP packet here...
*/
if (i == sizeof(tokbuf)) {
parse_warn("string constant larger than internal buffer");
i--;
}
tokbuf[i] = 0;
tval = tokbuf;
return (STRING);
}
static int
read_number(int c, FILE *cfile)
{
int seenx = 0, i = 0, token = NUMBER;
tokbuf[i++] = c;
for (; i < sizeof(tokbuf); i++) {
c = get_char(cfile);
if (!seenx && c == 'x')
seenx = 1;
else if (!isascii(c) || !isxdigit(c)) {
ungetc(c, cfile);
ugflag = 1;
break;
}
tokbuf[i] = c;
}
if (i == sizeof(tokbuf)) {
parse_warn("numeric token larger than internal buffer");
i--;
}
tokbuf[i] = 0;
tval = tokbuf;
return (token);
}
static int
read_num_or_name(int c, FILE *cfile)
{
int i = 0;
int rv = NUMBER_OR_NAME;
tokbuf[i++] = c;
for (; i < sizeof(tokbuf); i++) {
c = get_char(cfile);
if (!isascii(c) || (c != '-' && c != '_' && !isalnum(c))) {
ungetc(c, cfile);
ugflag = 1;
break;
}
if (!isxdigit(c))
rv = NAME;
tokbuf[i] = c;
}
if (i == sizeof(tokbuf)) {
parse_warn("token larger than internal buffer");
i--;
}
tokbuf[i] = 0;
tval = tokbuf;
return (intern(tval, rv));
}
static int
intern(char *atom, int dfv)
{
if (!isascii(atom[0]))
return (dfv);
switch (tolower(atom[0])) {
case 'a':
if (!strcasecmp(atom + 1, "lways-reply-rfc1048"))
return (ALWAYS_REPLY_RFC1048);
if (!strcasecmp(atom + 1, "ppend"))
return (APPEND);
if (!strcasecmp(atom + 1, "llow"))
return (ALLOW);
if (!strcasecmp(atom + 1, "lias"))
return (ALIAS);
if (!strcasecmp(atom + 1, "bandoned"))
return (ABANDONED);
if (!strcasecmp(atom + 1, "uthoritative"))
return (AUTHORITATIVE);
break;
case 'b':
if (!strcasecmp(atom + 1, "ackoff-cutoff"))
return (BACKOFF_CUTOFF);
if (!strcasecmp(atom + 1, "ootp"))
return (BOOTP);
if (!strcasecmp(atom + 1, "ooting"))
return (BOOTING);
if (!strcasecmp(atom + 1, "oot-unknown-clients"))
return (BOOT_UNKNOWN_CLIENTS);
case 'c':
if (!strcasecmp(atom + 1, "lass"))
return (CLASS);
if (!strcasecmp(atom + 1, "iaddr"))
return (CIADDR);
if (!strcasecmp(atom + 1, "lient-identifier"))
return (CLIENT_IDENTIFIER);
if (!strcasecmp(atom + 1, "lient-hostname"))
return (CLIENT_HOSTNAME);
break;
case 'd':
if (!strcasecmp(atom + 1, "omain"))
return (DOMAIN);
if (!strcasecmp(atom + 1, "eny"))
return (DENY);
if (!strncasecmp(atom + 1, "efault", 6)) {
if (!atom[7])
return (DEFAULT);
if (!strcasecmp(atom + 7, "-lease-time"))
return (DEFAULT_LEASE_TIME);
break;
}
if (!strncasecmp(atom + 1, "ynamic-bootp", 12)) {
if (!atom[13])
return (DYNAMIC_BOOTP);
if (!strcasecmp(atom + 13, "-lease-cutoff"))
return (DYNAMIC_BOOTP_LEASE_CUTOFF);
if (!strcasecmp(atom + 13, "-lease-length"))
return (DYNAMIC_BOOTP_LEASE_LENGTH);
break;
}
break;
case 'e':
if (!strcasecmp(atom + 1, "thernet"))
return (ETHERNET);
if (!strcasecmp(atom + 1, "nds"))
return (ENDS);
if (!strcasecmp(atom + 1, "xpire"))
return (EXPIRE);
break;
case 'f':
if (!strcasecmp(atom + 1, "ilename"))
return (FILENAME);
if (!strcasecmp(atom + 1, "ixed-address"))
return (FIXED_ADDR);
if (!strcasecmp(atom + 1, "ddi"))
return (FDDI);
break;
case 'g':
if (!strcasecmp(atom + 1, "iaddr"))
return (GIADDR);
if (!strcasecmp(atom + 1, "roup"))
return (GROUP);
if (!strcasecmp(atom + 1, "et-lease-hostnames"))
return (GET_LEASE_HOSTNAMES);
break;
case 'h':
if (!strcasecmp(atom + 1, "ost"))
return (HOST);
if (!strcasecmp(atom + 1, "ardware"))
return (HARDWARE);
if (!strcasecmp(atom + 1, "ostname"))
return (HOSTNAME);
break;
case 'i':
if (!strcasecmp(atom + 1, "nitial-interval"))
return (INITIAL_INTERVAL);
if (!strcasecmp(atom + 1, "nterface"))
return (INTERFACE);
break;
case 'l':
if (!strcasecmp(atom + 1, "ease"))
return (LEASE);
break;
case 'm':
if (!strcasecmp(atom + 1, "ax-lease-time"))
return (MAX_LEASE_TIME);
if (!strncasecmp(atom + 1, "edi", 3)) {
if (!strcasecmp(atom + 4, "a"))
return (MEDIA);
if (!strcasecmp(atom + 4, "um"))
return (MEDIUM);
break;
}
break;
case 'n':
if (!strcasecmp(atom + 1, "ameserver"))
return (NAMESERVER);
if (!strcasecmp(atom + 1, "etmask"))
return (NETMASK);
if (!strcasecmp(atom + 1, "ext-server"))
return (NEXT_SERVER);
if (!strcasecmp(atom + 1, "ot"))
return (TOKEN_NOT);
break;
case 'o':
if (!strcasecmp(atom + 1, "ption"))
return (OPTION);
if (!strcasecmp(atom + 1, "ne-lease-per-client"))
return (ONE_LEASE_PER_CLIENT);
break;
case 'p':
if (!strcasecmp(atom + 1, "repend"))
return (PREPEND);
if (!strcasecmp(atom + 1, "acket"))
return (PACKET);
break;
case 'r':
if (!strcasecmp(atom + 1, "ange"))
return (RANGE);
if (!strcasecmp(atom + 1, "equest"))
return (REQUEST);
if (!strcasecmp(atom + 1, "equire"))
return (REQUIRE);
if (!strcasecmp(atom + 1, "etry"))
return (RETRY);
if (!strcasecmp(atom + 1, "enew"))
return (RENEW);
if (!strcasecmp(atom + 1, "ebind"))
return (REBIND);
if (!strcasecmp(atom + 1, "eboot"))
return (REBOOT);
if (!strcasecmp(atom + 1, "eject"))
return (REJECT);
break;
case 's':
if (!strcasecmp(atom + 1, "earch"))
return (SEARCH);
if (!strcasecmp(atom + 1, "tarts"))
return (STARTS);
if (!strcasecmp(atom + 1, "iaddr"))
return (SIADDR);
if (!strcasecmp(atom + 1, "ubnet"))
return (SUBNET);
if (!strcasecmp(atom + 1, "hared-network"))
return (SHARED_NETWORK);
if (!strcasecmp(atom + 1, "erver-name"))
return (SERVER_NAME);
if (!strcasecmp(atom + 1, "erver-identifier"))
return (SERVER_IDENTIFIER);
if (!strcasecmp(atom + 1, "elect-timeout"))
return (SELECT_TIMEOUT);
if (!strcasecmp(atom + 1, "end"))
return (SEND);
if (!strcasecmp(atom + 1, "cript"))
return (SCRIPT);
if (!strcasecmp(atom + 1, "upersede"))
return (SUPERSEDE);
break;
case 't':
if (!strcasecmp(atom + 1, "imestamp"))
return (TIMESTAMP);
if (!strcasecmp(atom + 1, "imeout"))
return (TIMEOUT);
if (!strcasecmp(atom + 1, "oken-ring"))
return (TOKEN_RING);
break;
case 'u':
if (!strncasecmp(atom + 1, "se", 2)) {
if (!strcasecmp(atom + 3, "r-class"))
return (USER_CLASS);
if (!strcasecmp(atom + 3, "-host-decl-names"))
return (USE_HOST_DECL_NAMES);
if (!strcasecmp(atom + 3,
"-lease-addr-for-default-route"))
return (USE_LEASE_ADDR_FOR_DEFAULT_ROUTE);
break;
}
if (!strcasecmp(atom + 1, "id"))
return (UID);
if (!strcasecmp(atom + 1, "nknown-clients"))
return (UNKNOWN_CLIENTS);
break;
case 'v':
if (!strcasecmp(atom + 1, "endor-class"))
return (VENDOR_CLASS);
break;
case 'y':
if (!strcasecmp(atom + 1, "iaddr"))
return (YIADDR);
break;
}
return (dfv);
}
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