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
210
211
212
213
214
215
216
217
218
|
/**//* $OpenBSD: print-icmp.c,v 1.3 1996/06/10 07:47:36 deraadt Exp $ */
/* $NetBSD: print-icmp.c,v 1.3 1995/03/06 19:11:13 mycroft Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
* 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 char rcsid[] =
"@(#) Header: print-icmp.c,v 1.20 94/06/14 20:17:39 leres Exp (LBL)";
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <stdio.h>
#include "interface.h"
#include "addrtoname.h"
void
icmp_print(register const u_char *bp, register const u_char *bp2)
{
register const struct icmp *dp;
register const struct ip *ip;
register const char *str;
register const struct ip *oip;
register const struct udphdr *ouh;
register int hlen, dport;
register const u_char *ep;
char buf[256];
#define TCHECK(var, l) if ((u_char *)&(var) > ep - l) goto trunc
dp = (struct icmp *)bp;
ip = (struct ip *)bp2;
str = buf;
/* 'ep' points to the end of avaible data. */
ep = snapend;
(void)printf("%s > %s: ",
ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
TCHECK(dp->icmp_code, sizeof(dp->icmp_code));
switch (dp->icmp_type) {
case ICMP_ECHOREPLY:
str = "echo reply";
break;
case ICMP_UNREACH:
TCHECK(dp->icmp_ip.ip_dst, sizeof(dp->icmp_ip.ip_dst));
switch (dp->icmp_code) {
case ICMP_UNREACH_NET:
(void)sprintf(buf, "net %s unreachable",
ipaddr_string(&dp->icmp_ip.ip_dst));
break;
case ICMP_UNREACH_HOST:
(void)sprintf(buf, "host %s unreachable",
ipaddr_string(&dp->icmp_ip.ip_dst));
break;
case ICMP_UNREACH_PROTOCOL:
TCHECK(dp->icmp_ip.ip_p, sizeof(dp->icmp_ip.ip_p));
(void)sprintf(buf, "%s protocol %d unreachable",
ipaddr_string(&dp->icmp_ip.ip_dst),
dp->icmp_ip.ip_p);
break;
case ICMP_UNREACH_PORT:
TCHECK(dp->icmp_ip.ip_p, sizeof(dp->icmp_ip.ip_p));
oip = &dp->icmp_ip;
hlen = oip->ip_hl * 4;
ouh = (struct udphdr *)(((u_char *)oip) + hlen);
dport = ntohs(ouh->uh_dport);
switch (oip->ip_p) {
case IPPROTO_TCP:
(void)sprintf(buf,
"%s tcp port %s unreachable",
ipaddr_string(&oip->ip_dst),
tcpport_string(dport));
break;
case IPPROTO_UDP:
(void)sprintf(buf,
"%s udp port %s unreachable",
ipaddr_string(&oip->ip_dst),
udpport_string(dport));
break;
default:
(void)sprintf(buf,
"%s protocol %d port %d unreachable",
ipaddr_string(&oip->ip_dst),
oip->ip_p, dport);
break;
}
break;
case ICMP_UNREACH_NEEDFRAG:
(void)sprintf(buf, "%s unreachable - need to frag",
ipaddr_string(&dp->icmp_ip.ip_dst));
break;
case ICMP_UNREACH_SRCFAIL:
(void)sprintf(buf,
"%s unreachable - source route failed",
ipaddr_string(&dp->icmp_ip.ip_dst));
break;
}
break;
case ICMP_SOURCEQUENCH:
str = "source quench";
break;
case ICMP_REDIRECT:
TCHECK(dp->icmp_ip.ip_dst, sizeof(dp->icmp_ip.ip_dst));
switch (dp->icmp_code) {
case ICMP_REDIRECT_NET:
(void)sprintf(buf, "redirect %s to net %s",
ipaddr_string(&dp->icmp_ip.ip_dst),
ipaddr_string(&dp->icmp_gwaddr));
break;
case ICMP_REDIRECT_HOST:
(void)sprintf(buf, "redirect %s to host %s",
ipaddr_string(&dp->icmp_ip.ip_dst),
ipaddr_string(&dp->icmp_gwaddr));
break;
case ICMP_REDIRECT_TOSNET:
(void)sprintf(buf, "redirect-tos %s to net %s",
ipaddr_string(&dp->icmp_ip.ip_dst),
ipaddr_string(&dp->icmp_gwaddr));
break;
case ICMP_REDIRECT_TOSHOST:
(void)sprintf(buf, "redirect-tos %s to host %s",
ipaddr_string(&dp->icmp_ip.ip_dst),
ipaddr_string(&dp->icmp_gwaddr));
break;
}
break;
case ICMP_ECHO:
str = "echo request";
break;
case ICMP_TIMXCEED:
TCHECK(dp->icmp_ip.ip_dst, sizeof(dp->icmp_ip.ip_dst));
switch (dp->icmp_code) {
case ICMP_TIMXCEED_INTRANS:
str = "time exceeded in-transit";
break;
case ICMP_TIMXCEED_REASS:
str = "ip reassembly time exceeded";
break;
}
break;
case ICMP_PARAMPROB:
if (dp->icmp_code)
(void)sprintf(buf, "parameter problem - code %d",
dp->icmp_code);
else {
TCHECK(dp->icmp_pptr, sizeof(dp->icmp_pptr));
(void)sprintf(buf, "parameter problem - octet %d",
dp->icmp_pptr);
}
break;
case ICMP_TSTAMP:
str = "time stamp request";
break;
case ICMP_TSTAMPREPLY:
str = "time stamp reply";
break;
case ICMP_IREQ:
str = "information request";
break;
case ICMP_IREQREPLY:
str = "information reply";
break;
case ICMP_MASKREQ:
str = "address mask request";
break;
case ICMP_MASKREPLY:
TCHECK(dp->icmp_mask, sizeof(dp->icmp_mask));
(void)sprintf(buf, "address mask is 0x%08x",
ntohl(dp->icmp_mask));
break;
default:
(void)sprintf(buf, "type-#%d", dp->icmp_type);
break;
}
(void)printf("icmp: %s", str);
return;
trunc:
fputs("[|icmp]", stdout);
#undef TCHECK
}
|
