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%{
/* $OpenBSD: scanner.l,v 1.6 1997/07/22 07:42:32 deraadt Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char rcsid[] =
"@(#) $Header: /cvs/OpenBSD/src/lib/libpcap/scanner.l,v 1.6 1997/07/22 07:42:32 deraadt Exp $ (LBL)";
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <ctype.h>
#include <unistd.h>
#include <pcap.h>
#include <pcap-namedb.h>
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#include "pcap-int.h"
#include "gencode.h"
#include "grammar.tab.h"
static int stoi(char *);
static inline int xdtoi(int);
#ifdef FLEX_SCANNER
#undef YY_INPUT
#define YY_INPUT(buf, result, max)\
{\
char *src = in_buffer;\
int i;\
\
if (*src == 0)\
result = YY_NULL;\
else {\
for (i = 0; *src && i < max; ++i)\
buf[i] = *src++;\
in_buffer += i;\
result = i;\
}\
}
#else
#undef getc
#define getc(fp) (*in_buffer == 0 ? EOF : *in_buffer++)
#endif
extern YYSTYPE yylval;
static char *in_buffer;
%}
N ([0-9]+|(0X|0x)[0-9A-Fa-f]+)
B ([0-9A-Fa-f][0-9A-Fa-f]?)
%a 3000
%%
dst return DST;
src return SRC;
link|ether|ppp|slip return LINK;
fddi return LINK;
arp return ARP;
rarp return RARP;
ip return IP;
tcp return TCP;
udp return UDP;
icmp return ICMP;
igmp return IGMP;
decnet return DECNET;
lat return LAT;
moprc return MOPRC;
mopdl return MOPDL;
host return HOST;
net return NET;
port return PORT;
proto return PROTO;
gateway return GATEWAY;
less return LESS;
greater return GREATER;
byte return BYTE;
broadcast return TK_BROADCAST;
multicast return TK_MULTICAST;
and|"&&" return AND;
or|"||" return OR;
not return '!';
len|length return LEN;
inbound return INBOUND;
outbound return OUTBOUND;
[ \n\t] ;
[+\-*/:\[\]!<>()&|=] return yytext[0];
">=" return GEQ;
"<=" return LEQ;
"!=" return NEQ;
"==" return '=';
"<<" return LSH;
">>" return RSH;
{N} { yylval.i = stoi((char *)yytext); return NUM; }
({N}\.{N})|({N}\.{N}\.{N})|({N}\.{N}\.{N}\.{N}) {
yylval.s = sdup((char *)yytext); return HID; }
{B}:{B}:{B}:{B}:{B}:{B} { yylval.e = pcap_ether_aton((char *)yytext);
return EID; }
{B}:+({B}:+)+ { bpf_error("bogus ethernet address %s", yytext); }
[A-Za-z0-9][-_.A-Za-z0-9]*[.A-Za-z0-9] {
yylval.s = sdup((char *)yytext); return ID; }
"\\"[^ !()\n\t]+ { yylval.s = sdup((char *)yytext + 1); return ID; }
[^ \[\]\t\n\-_.A-Za-z0-9!<>()&|=]+i {
bpf_error("illegal token: %s\n", yytext); }
. { bpf_error("illegal char '%c'", *yytext); }
%%
void
lex_init(buf)
char *buf;
{
in_buffer = buf;
}
/*
* Also define a yywrap. Note that if we're using flex, it will
* define a macro to map this identifier to pcap_wrap.
*/
int
yywrap()
{
return 1;
}
/* Hex digit to integer. */
static inline int
xdtoi(c)
register int c;
{
if (isdigit(c))
return c - '0';
else if (islower(c))
return c - 'a' + 10;
else
return c - 'A' + 10;
}
/*
* Convert string to integer. Just like atoi(), but checks for
* preceding 0x or 0 and uses hex or octal instead of decimal.
*/
static int
stoi(s)
char *s;
{
int base = 10;
int n = 0;
if (*s == '0') {
if (s[1] == 'x' || s[1] == 'X') {
s += 2;
base = 16;
}
else {
base = 8;
s += 1;
}
}
while (*s)
n = n * base + xdtoi(*s++);
return n;
}
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