1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
| 1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
|
21 * $FreeBSD: head/contrib/tcpdump/print-arp.c 56896 2000-01-30 01:05:24Z fenner $
| 21 * $FreeBSD: head/contrib/tcpdump/print-arp.c 75118 2001-04-03 07:50:46Z fenner $
|
22 */
23
24#ifndef lint
25static const char rcsid[] =
| 22 */
23
24#ifndef lint
25static const char rcsid[] =
|
26 "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.44 1999/11/21 09:36:48 fenner Exp $ (LBL)";
| 26 "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.49 2000/10/10 05:05:07 guy Exp $ (LBL)";
|
27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
33#include <sys/param.h>
34#include <sys/time.h>
| 27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
33#include <sys/param.h>
34#include <sys/time.h>
|
35#include <sys/socket.h>
| |
36
| 35
|
37#if __STDC__
38struct mbuf;
39struct rtentry;
40#endif
41#include <net/if.h>
42#include <net/if_var.h>
43
| |
44#include <netinet/in.h>
| 36#include <netinet/in.h>
|
45#include <netinet/if_ether.h>
| |
46
| 37
|
47#ifdef HAVE_MEMORY_H
48#include <memory.h>
49#endif
| |
50#include <stdio.h>
51#include <string.h>
52
53#include "interface.h"
54#include "addrtoname.h"
| 38#include <stdio.h>
39#include <string.h>
40
41#include "interface.h"
42#include "addrtoname.h"
|
| 43#include "ether.h"
|
55#include "ethertype.h"
56#include "extract.h" /* must come after interface.h */
57
| 44#include "ethertype.h"
45#include "extract.h" /* must come after interface.h */
46
|
| 47/*
48 * Address Resolution Protocol.
49 *
50 * See RFC 826 for protocol description. ARP packets are variable
51 * in size; the arphdr structure defines the fixed-length portion.
52 * Protocol type values are the same as those for 10 Mb/s Ethernet.
53 * It is followed by the variable-sized fields ar_sha, arp_spa,
54 * arp_tha and arp_tpa in that order, according to the lengths
55 * specified. Field names used correspond to RFC 826.
56 */
57struct arphdr {
58 u_short ar_hrd; /* format of hardware address */
59#define ARPHRD_ETHER 1 /* ethernet hardware format */
60#define ARPHRD_IEEE802 6 /* token-ring hardware format */
61#define ARPHRD_FRELAY 15 /* frame relay hardware format */
62 u_short ar_pro; /* format of protocol address */
63 u_char ar_hln; /* length of hardware address */
64 u_char ar_pln; /* length of protocol address */
65 u_short ar_op; /* one of: */
66#define ARPOP_REQUEST 1 /* request to resolve address */
67#define ARPOP_REPLY 2 /* response to previous request */
68#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
69#define ARPOP_REVREPLY 4 /* response giving protocol address */
70#define ARPOP_INVREQUEST 8 /* request to identify peer */
71#define ARPOP_INVREPLY 9 /* response identifying peer */
72/*
73 * The remaining fields are variable in size,
74 * according to the sizes above.
75 */
76#ifdef COMMENT_ONLY
77 u_char ar_sha[]; /* sender hardware address */
78 u_char ar_spa[]; /* sender protocol address */
79 u_char ar_tha[]; /* target hardware address */
80 u_char ar_tpa[]; /* target protocol address */
81#endif
82};
83
84#define ARP_HDRLEN 8
85
86/*
87 * Ethernet Address Resolution Protocol.
88 *
89 * See RFC 826 for protocol description. Structure below is adapted
90 * to resolving internet addresses. Field names used correspond to
91 * RFC 826.
92 */
93struct ether_arp {
94 struct arphdr ea_hdr; /* fixed-size header */
95 u_char arp_sha[6]; /* sender hardware address */
96 u_char arp_spa[4]; /* sender protocol address */
97 u_char arp_tha[6]; /* target hardware address */
98 u_char arp_tpa[4]; /* target protocol address */
99};
100#define arp_hrd ea_hdr.ar_hrd
101#define arp_pro ea_hdr.ar_pro
102#define arp_hln ea_hdr.ar_hln
103#define arp_pln ea_hdr.ar_pln
104#define arp_op ea_hdr.ar_op
105
106#define ETHER_ARP_HDRLEN (ARP_HDRLEN + 6 + 4 + 6 + 4)
107
108#define SHA(ap) ((ap)->arp_sha)
109#define THA(ap) ((ap)->arp_tha)
110#define SPA(ap) ((ap)->arp_spa)
111#define TPA(ap) ((ap)->arp_tpa)
112
|
58/* Compatibility */
59#ifndef REVARP_REQUEST
60#define REVARP_REQUEST 3
61#endif
62#ifndef REVARP_REPLY
63#define REVARP_REPLY 4
64#endif
65
66static u_char ezero[6];
67
68void
69arp_print(register const u_char *bp, u_int length, u_int caplen)
70{
71 register const struct ether_arp *ap;
72 register const struct ether_header *eh;
73 register u_short pro, hrd, op;
74
75 ap = (struct ether_arp *)bp;
76 if ((u_char *)(ap + 1) > snapend) {
77 printf("[|arp]");
78 return;
79 }
| 113/* Compatibility */
114#ifndef REVARP_REQUEST
115#define REVARP_REQUEST 3
116#endif
117#ifndef REVARP_REPLY
118#define REVARP_REPLY 4
119#endif
120
121static u_char ezero[6];
122
123void
124arp_print(register const u_char *bp, u_int length, u_int caplen)
125{
126 register const struct ether_arp *ap;
127 register const struct ether_header *eh;
128 register u_short pro, hrd, op;
129
130 ap = (struct ether_arp *)bp;
131 if ((u_char *)(ap + 1) > snapend) {
132 printf("[|arp]");
133 return;
134 }
|
80 if (length < sizeof(struct ether_arp)) {
| 135 if (length < ETHER_ARP_HDRLEN) {
|
81 (void)printf("truncated-arp");
82 default_print((u_char *)ap, length);
83 return;
84 }
85
86 pro = EXTRACT_16BITS(&ap->arp_pro);
87 hrd = EXTRACT_16BITS(&ap->arp_hrd);
88 op = EXTRACT_16BITS(&ap->arp_op);
89
90 if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
91 || ap->arp_hln != sizeof(SHA(ap))
92 || ap->arp_pln != sizeof(SPA(ap))) {
93 (void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
94 op, pro, ap->arp_pln,
95 hrd, ap->arp_hln);
96 return;
97 }
98 if (pro == ETHERTYPE_TRAIL)
99 (void)printf("trailer-");
100 eh = (struct ether_header *)packetp;
101 switch (op) {
102
103 case ARPOP_REQUEST:
104 (void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
105 if (memcmp((char *)ezero, (char *)THA(ap), 6) != 0)
106 (void)printf(" (%s)", etheraddr_string(THA(ap)));
107 (void)printf(" tell %s", ipaddr_string(SPA(ap)));
108 if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
109 (void)printf(" (%s)", etheraddr_string(SHA(ap)));
110 break;
111
112 case ARPOP_REPLY:
113 (void)printf("arp reply %s", ipaddr_string(SPA(ap)));
114 if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
115 (void)printf(" (%s)", etheraddr_string(SHA(ap)));
116 (void)printf(" is-at %s", etheraddr_string(SHA(ap)));
117 if (memcmp((char *)EDST(eh), (char *)THA(ap), 6) != 0)
118 (void)printf(" (%s)", etheraddr_string(THA(ap)));
119 break;
120
121 case REVARP_REQUEST:
122 (void)printf("rarp who-is %s tell %s",
123 etheraddr_string(THA(ap)),
124 etheraddr_string(SHA(ap)));
125 break;
126
127 case REVARP_REPLY:
128 (void)printf("rarp reply %s at %s",
129 etheraddr_string(THA(ap)),
130 ipaddr_string(TPA(ap)));
131 break;
132
133 default:
134 (void)printf("arp-#%d", op);
135 default_print((u_char *)ap, caplen);
136 return;
137 }
138 if (hrd != ARPHRD_ETHER)
139 printf(" hardware #%d", hrd);
140}
| 136 (void)printf("truncated-arp");
137 default_print((u_char *)ap, length);
138 return;
139 }
140
141 pro = EXTRACT_16BITS(&ap->arp_pro);
142 hrd = EXTRACT_16BITS(&ap->arp_hrd);
143 op = EXTRACT_16BITS(&ap->arp_op);
144
145 if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
146 || ap->arp_hln != sizeof(SHA(ap))
147 || ap->arp_pln != sizeof(SPA(ap))) {
148 (void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
149 op, pro, ap->arp_pln,
150 hrd, ap->arp_hln);
151 return;
152 }
153 if (pro == ETHERTYPE_TRAIL)
154 (void)printf("trailer-");
155 eh = (struct ether_header *)packetp;
156 switch (op) {
157
158 case ARPOP_REQUEST:
159 (void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
160 if (memcmp((char *)ezero, (char *)THA(ap), 6) != 0)
161 (void)printf(" (%s)", etheraddr_string(THA(ap)));
162 (void)printf(" tell %s", ipaddr_string(SPA(ap)));
163 if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
164 (void)printf(" (%s)", etheraddr_string(SHA(ap)));
165 break;
166
167 case ARPOP_REPLY:
168 (void)printf("arp reply %s", ipaddr_string(SPA(ap)));
169 if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
170 (void)printf(" (%s)", etheraddr_string(SHA(ap)));
171 (void)printf(" is-at %s", etheraddr_string(SHA(ap)));
172 if (memcmp((char *)EDST(eh), (char *)THA(ap), 6) != 0)
173 (void)printf(" (%s)", etheraddr_string(THA(ap)));
174 break;
175
176 case REVARP_REQUEST:
177 (void)printf("rarp who-is %s tell %s",
178 etheraddr_string(THA(ap)),
179 etheraddr_string(SHA(ap)));
180 break;
181
182 case REVARP_REPLY:
183 (void)printf("rarp reply %s at %s",
184 etheraddr_string(THA(ap)),
185 ipaddr_string(TPA(ap)));
186 break;
187
188 default:
189 (void)printf("arp-#%d", op);
190 default_print((u_char *)ap, caplen);
191 return;
192 }
193 if (hrd != ARPHRD_ETHER)
194 printf(" hardware #%d", hrd);
195}
|