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
|
/*
* (C)opyright 1993-1996 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#include <stdio.h>
#include <assert.h>
#include <string.h>
#if !defined(__SVR4) && !defined(__svr4__)
#include <strings.h>
#else
#include <sys/byteorder.h>
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip_var.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcpip.h>
#include <net/if.h>
#include "ip_fil_compat.h"
#include "ip_fil.h"
#include <netdb.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <resolv.h>
#include "ipf.h"
#include "ipt.h"
#include <ctype.h>
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)ipt.c 1.19 6/3/96 (C) 1993-1996 Darren Reed";
static char rcsid[] = "$Id: ipt.c,v 1.8 1997/02/11 22:23:58 kstailey Exp $";
#endif
extern int fr_check();
extern char *optarg;
extern struct frentry *ipfilter[2][2];
extern struct ipread snoop, etherf, tcpd, pcap, iptext, iphex;
extern void debug(), verbose();
struct frentry *ft_in = NULL, *ft_out = NULL;
int opts = 0;
int main(argc,argv)
int argc;
char *argv[];
{
struct ipread *r = &iptext;
struct frentry *f;
struct ip *ip;
u_long buf[64];
char c;
char *rules = NULL, *datain = NULL, *iface = NULL;
int fd, i, dir = 0;
while ((c = getopt(argc, argv, "bdEHi:I:Pr:STvX")) != -1)
switch (c)
{
case 'b' :
opts |= OPT_BRIEF;
break;
case 'd' :
opts |= OPT_DEBUG;
break;
case 'i' :
datain = optarg;
break;
case 'I' :
iface = optarg;
break;
case 'r' :
rules = optarg;
break;
case 'v' :
opts |= OPT_VERBOSE;
break;
case 'E' :
r = ðerf;
break;
case 'H' :
r = &iphex;
break;
case 'P' :
r = &pcap;
break;
case 'S' :
r = &snoop;
break;
case 'T' :
r = &tcpd;
break;
case 'X' :
r = &iptext;
break;
}
if (!rules) {
(void)fprintf(stderr,"no rule file present\n");
exit(-1);
}
initparse();
if (rules) {
struct frentry *fr;
char line[513], *s;
FILE *fp;
if (!strcmp(rules, "-"))
fp = stdin;
else if (!(fp = fopen(rules, "r"))) {
(void)fprintf(stderr, "couldn't open %s\n", rules);
exit(-1);
}
if (!(opts & OPT_BRIEF))
(void)printf("opening rule file \"%s\"\n", rules);
while (fgets(line, sizeof(line)-1, fp)) {
/*
* treat both CR and LF as EOL
*/
if ((s = index(line, '\n')))
*s = '\0';
if ((s = index(line, '\r')))
*s = '\0';
/*
* # is comment marker, everything after is a ignored
*/
if ((s = index(line, '#')))
*s = '\0';
if (!*line)
continue;
if (!(fr = parse(line)))
continue;
f = (struct frentry *)malloc(sizeof(*f));
if (fr->fr_flags & FR_INQUE) {
if (!ft_in)
ft_in = ipfilter[0][0] = f;
else
ft_in->fr_next = f, ft_in = f;
} else if (fr->fr_flags & FR_OUTQUE) {
if (!ft_out)
ft_out = ipfilter[1][0] = f;
else
ft_out->fr_next = f, ft_out = f;
}
bcopy((char *)fr, (char *)f, sizeof(*fr));
}
(void)fclose(fp);
}
if (datain)
fd = (*r->r_open)(datain);
else
fd = (*r->r_open)("-");
if (fd < 0)
exit(-1);
ip = (struct ip *)buf;
while ((i = (*r->r_readip)(buf, sizeof(buf), &iface, &dir)) > 0) {
ip->ip_off = ntohs(ip->ip_off);
ip->ip_len = ntohs(ip->ip_len);
switch (fr_check(ip, ip->ip_hl << 2, iface, dir)) /* XXX */
{
case -1 :
(void)printf("block");
break;
case 0 :
(void)printf("pass");
break;
case 1 :
(void)printf("nomatch");
break;
}
if (!(opts & OPT_BRIEF)) {
putchar(' ');
printpacket(buf);
printf("--------------");
}
putchar('\n');
dir = 0;
}
(*r->r_close)();
return 0;
}
|
