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freebsd-nq/sbin/dhclient/conflex.c
Luiz Otavio O Souza 1e7fe2fbb9 bpf: Add an ioctl to set the VLAN Priority on packets sent by bpf 
This allows the use of VLAN PCP in dhclient, which is required for
certain ISPs (such as Orange.fr).

Reviewed by:	bcr (man page)
MFC after:	1 week
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D31263
2021-07-26 23:13:31 +02:00

537 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... */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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;
static char *prev_line;
static char *cur_line;
const char *tlname;
int eol_token;
static char line1[81];
static char line2[81];
static unsigned lpos;
static unsigned 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(const 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 c, bs = 0;
unsigned i;
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, _token = NUMBER;
unsigned i = 0;
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)
{
unsigned 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);
break;
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);
if (!strcasecmp(atom + 1, "lan-pcp"))
return (VLAN_PCP);
break;
case 'y':
if (!strcasecmp(atom + 1, "iaddr"))
return (YIADDR);
break;
}
return (dfv);
}
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