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
|
/*
* (C)opyright 1993,1994,1995 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.
*/
/*
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 <stdio.h>
#include <string.h>
#if !defined(__SVR4) && !defined(__GNUC__)
#include <strings.h>
#endif
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/in_systm.h>
#include <netinet/ip_var.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcpip.h>
#include <net/if.h>
#include <netdb.h>
#include "ipf.h"
#include "ipt.h"
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)ipft_ef.c 1.6 2/4/96 (C)1995 Darren Reed";
static char rcsid[] = "$Id: ipft_ef.c,v 1.6 1997/02/11 22:23:48 kstailey Exp $";
#endif
static int etherf_open(), etherf_close(), etherf_readip();
struct ipread etherf = { etherf_open, etherf_close, etherf_readip };
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;
struct ip *ip = (struct ip *)&pkt;
struct protoent *p = NULL;
char src[16], dst[16], sprt[16], dprt[16];
char lbuf[128], len[8], prot[8], time[8], *s;
int slen, extra = 0, i, n;
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 ((n = sscanf(lbuf, "%s %s %s %s %s %s", len, prot, src, dst,
sprt, dprt)) != 6)
if ((n = sscanf(lbuf, "%s %s %s %s %s %s %s", time,
len, prot, src, dst, sprt, dprt)) != 7)
return -1;
ip->ip_p = atoi(prot);
if (ip->ip_p == 0) {
if (!(p = getprotobyname(prot)))
return -1;
ip->ip_p = p->p_proto;
}
switch (ip->ip_p) {
case IPPROTO_TCP :
case IPPROTO_UDP :
s = strtok(NULL, " :");
ip->ip_len += atoi(s);
if (p->p_proto == IPPROTO_TCP)
extra = sizeof(struct tcphdr);
else if (p->p_proto == 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->ip_hl = sizeof(struct ip);
slen = ip->ip_hl + extra;
i = MIN(cnt, slen);
bcopy((char *)&pkt, buf, i);
return i;
}
|
