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
|
/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* $Id: ipft_ef.c,v 1.14 2004/01/08 13:34:31 darrenr Exp $
*/
/*
icmp type
lnth proto source destination src port dst port
etherfind -n
60 tcp 128.250.20.20 128.250.133.13 2419 telnet
etherfind -n -t
0.32 91 04 131.170.1.10 128.250.133.13
0.33 566 udp 128.250.37.155 128.250.133.3 901 901
*/
#include "ipf.h"
#include "ipt.h"
#ifndef linux
#include <netinet/ip_var.h>
#endif
#include <netinet/tcpip.h>
#if !defined(lint)
static const char sccsid[] = "@(#)ipft_ef.c 1.6 2/4/96 (C)1995 Darren Reed";
static const char rcsid[] = "@(#)$Id: ipft_ef.c,v 1.14 2004/01/08 13:34:31 darrenr Exp $";
#endif
static int etherf_open __P((char *));
static int etherf_close __P((void));
static int etherf_readip __P((char *, int, char **, int *));
struct ipread etherf = { etherf_open, etherf_close, etherf_readip, 0 };
static FILE *efp = NULL;
static int efd = -1;
static int etherf_open(fname)
char *fname;
{
if (efd != -1)
return efd;
if (!strcmp(fname, "-")) {
efd = 0;
efp = stdin;
} else {
efd = open(fname, O_RDONLY);
efp = fdopen(efd, "r");
}
return efd;
}
static int etherf_close()
{
return close(efd);
}
static int etherf_readip(buf, cnt, ifn, dir)
char *buf, **ifn;
int cnt, *dir;
{
struct tcpiphdr pkt;
ip_t *ip = (ip_t *)&pkt;
char src[16], dst[16], sprt[16], dprt[16];
char lbuf[128], len[8], prot[8], time[8], *s;
int slen, extra = 0, i;
if (!fgets(lbuf, sizeof(lbuf) - 1, efp))
return 0;
if ((s = strchr(lbuf, '\n')))
*s = '\0';
lbuf[sizeof(lbuf)-1] = '\0';
bzero(&pkt, sizeof(pkt));
if (sscanf(lbuf, "%7s %7s %15s %15s %15s %15s", len, prot, src, dst,
sprt, dprt) != 6)
if (sscanf(lbuf, "%7s %7s %7s %15s %15s %15s %15s", time,
len, prot, src, dst, sprt, dprt) != 7)
return -1;
ip->ip_p = getproto(prot);
switch (ip->ip_p) {
case IPPROTO_TCP :
case IPPROTO_UDP :
s = strtok(NULL, " :");
ip->ip_len += atoi(s);
if (ip->ip_p == IPPROTO_TCP)
extra = sizeof(struct tcphdr);
else if (ip->ip_p == IPPROTO_UDP)
extra = sizeof(struct udphdr);
break;
#ifdef IGMP
case IPPROTO_IGMP :
extra = sizeof(struct igmp);
break;
#endif
case IPPROTO_ICMP :
extra = sizeof(struct icmp);
break;
default :
break;
}
(void) inet_aton(src, &ip->ip_src);
(void) inet_aton(dst, &ip->ip_dst);
ip->ip_len = atoi(len);
IP_HL_A(ip, sizeof(ip_t));
slen = IP_HL(ip) + extra;
i = MIN(cnt, slen);
bcopy((char *)&pkt, buf, i);
return i;
}
|