1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
%{
/*
* 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 const char rcsid[] =
"@(#) $Header: scanner.l,v 1.56 97/07/21 13:31:50 leres Exp $ (LBL)";
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <ctype.h>
#include <unistd.h>
#include "pcap-int.h"
#include "gencode.h"
#include <pcap-namedb.h>
#include "tokdefs.h"
#include "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
static int stoi(char *);
static inline int xdtoi(int);
#ifdef FLEX_SCANNER
#define YY_NO_UNPUT
#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
#define yylval pcap_lval
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;
igrp return IGRP;
atalk return ATALK;
decnet return DECNET;
lat return LAT;
sca return SCA;
moprc return MOPRC;
mopdl return MOPDL;
iso return ISO;
esis return ESIS;
es-is return ESIS;
isis return ISIS;
is-is return ISIS;
host return HOST;
net return NET;
mask return MASK;
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;
}
|
