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
|
/* IP header tracing routines
* Copyright 1991 Phil Karn, KA9Q
*/
#include <stdio.h>
#include "listen.h"
#define IPLEN 20
#define MF 0x2000
#define DF 0x4000
#define CE 0x8000
#define IPIPNEW_PTCL 4
#define IPIPOLD_PTCL 94
#define TCP_PTCL 6
#define UDP_PTCL 17
#define ICMP_PTCL 1
#define AX25_PTCL 93
#define RSPF_PTCL 73
void ip_dump(unsigned char *data, int length, int hexdump)
{
int hdr_length;
int tos;
int ip_length;
int id;
int fl_offs;
int flags;
int offset;
int ttl;
int protocol;
unsigned char *source, *dest;
lprintf(T_PROTOCOL, "IP:");
/* Sneak peek at IP header and find length */
hdr_length = (data[0] & 0xf) << 2;
if (hdr_length < IPLEN) {
lprintf(T_ERROR, " bad header\n");
return;
}
tos = data[1];
ip_length = get16(data + 2);
id = get16(data + 4);
fl_offs = get16(data + 6);
flags = fl_offs & 0xE000;
offset = (fl_offs & 0x1FFF) << 3;
ttl = data[8];
protocol = data[9];
source = data + 12;
dest = data + 16;
lprintf(T_IPHDR, " len %d", ip_length);
lprintf(T_ADDR, " %d.%d.%d.%d->%d.%d.%d.%d",
source[0], source[1], source[2], source[3],
dest[0], dest[1], dest[2], dest[3]);
lprintf(T_IPHDR, " ihl %d ttl %d", hdr_length, ttl);
if (tos != 0)
lprintf(T_IPHDR, " tos %d", tos);
if (offset != 0 || (flags & MF))
lprintf(T_IPHDR, " id %d offs %d", id, offset);
if (flags & DF)
lprintf(T_IPHDR, " DF");
if (flags & MF)
lprintf(T_IPHDR, " MF");
if (flags & CE)
lprintf(T_IPHDR, " CE");
data += hdr_length;
length -= hdr_length;
if (offset != 0) {
lprintf(T_IPHDR, "\n");
if (length > 0)
data_dump(data, length, hexdump);
return;
}
switch (protocol) {
case IPIPOLD_PTCL:
case IPIPNEW_PTCL:
lprintf(T_IPHDR, " prot IP\n");
ip_dump(data, length, hexdump);
break;
case TCP_PTCL:
lprintf(T_IPHDR, " prot TCP\n");
tcp_dump(data, length, hexdump);
break;
case UDP_PTCL:
lprintf(T_IPHDR, " prot UDP\n");
udp_dump(data, length, hexdump);
break;
case ICMP_PTCL:
lprintf(T_IPHDR, " prot ICMP\n");
icmp_dump(data, length, hexdump);
break;
case AX25_PTCL:
lprintf(T_IPHDR, " prot AX25\n");
ax25_dump(data, length, hexdump);
break;
case RSPF_PTCL:
lprintf(T_IPHDR, " prot RSPF\n");
rspf_dump(data, length);
break;
default:
lprintf(T_IPHDR, " prot %d\n", protocol);
data_dump(data, length, hexdump);
break;
}
}
|
