1 /*
2 * Copyright (c) 1988-1990 The Regents of the University of California.
3 * 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
22 #ifndef lint
23 static char rcsid[] =
24 "@(#) $Header: /usr/staff/martinh/tcpview/RCS/print-arp.c,v 1.3 1993/04/22 20:27:45 martinh Exp $ (LBL)";
25 #endif
26
27 #include <sys/param.h>
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <net/if.h>
31 #include <netinet/in.h>
32 #include <netinet/if_ether.h>
33
34 #ifdef TCPVIEW
35 #include "tcpview.h"
36 #endif
37
38 #include "addrtoname.h"
39 #include "interface.h"
40
arp_print(ap,length,caplen)41 void arp_print(ap, length, caplen)
42 register struct ether_arp *ap;
43 int length;
44 int caplen;
45 {
46 short hrd, pro, op;
47 if ((u_char *)(ap + 1) > snapend) {
48 printf("[|arp]");
49 return;
50 }
51 if (length < sizeof(struct ether_arp)) {
52 (void)printf("truncated-arp");
53 default_print((u_short *)ap, length);
54 return;
55 }
56
57 hrd = ntohs(ap->arp_hrd);
58 pro = ntohs(ap->arp_pro);
59 op = ntohs(ap->arp_op);
60
61 if (hrd != ARPHRD_ETHER || (pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
62 || ap->arp_hln != sizeof(SHA(ap)) || ap->arp_pln != sizeof(SPA(ap))) {
63 (void)printf("arp-req #%d for proto #%d (%d) hardware %d (%d)",
64 op, pro, ap->arp_pln, hrd, ap->arp_hln);
65 return;
66 }
67 if (pro == ETHERTYPE_TRAIL)
68 (void)printf("trailer");
69 switch (op) {
70
71 case ARPOP_REQUEST:
72 (void)printf("arp who-has %s tell %s",
73 ipaddr_string(TPA(ap)),
74 ipaddr_string(SPA(ap)));
75 break;
76
77 case ARPOP_REPLY:
78 (void)printf("arp reply %s is-at %s",
79 ipaddr_string(SPA(ap)),
80 etheraddr_string(SHA(ap)));
81 break;
82
83 case REVARP_REQUEST:
84 (void)printf("rarp who-is %s tell %s",
85 etheraddr_string(THA(ap)),
86 etheraddr_string(SHA(ap)));
87 break;
88
89 case REVARP_REPLY:
90 (void)printf("rarp reply %s at %s",
91 etheraddr_string(THA(ap)),
92 ipaddr_string(TPA(ap)));
93 break;
94
95 default:
96 (void)printf("arp-%d", op);
97 default_print((u_short *)ap, caplen);
98 break;
99 }
100 }
101