1 /* maybe it should be merged into print-ppp.c */
3 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
4 * The Regents of the University of California. All rights reserved.
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7 * modification, are permitted provided that: (1) source code distributions
8 * retain the above copyright notice and this paragraph in its entirety, (2)
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11 * provided with the distribution, and (3) all advertising materials mentioning
12 * features or use of this software display the following acknowledgement:
13 * ``This product includes software developed by the University of California,
14 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
15 * the University nor the names of its contributors may be used to endorse
16 * or promote products derived from this software without specific prior
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
24 static const char rcsid[] =
25 "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.2 1999/11/21 09:36:49 fenner Exp $ (LBL)";
32 #include <sys/param.h>
34 #include <sys/socket.h>
36 #include <sys/ioctl.h>
44 #include <netinet/in.h>
45 #include <netinet/in_systm.h>
46 #include <netinet/ip.h>
47 #include <netinet/if_ether.h>
54 #include <net/slcompress.h>
55 #include <net/if_ppp.h>
58 #include "interface.h"
59 #include "addrtoname.h"
62 /* XXX This goes somewhere else. */
63 #define CHDLC_HDRLEN 4
64 #define CHDLC_UNICAST 0x0f
65 #define CHDLC_BCAST 0x8f
66 #define CHDLC_TYPE_SLARP 0x8035
67 #define CHDLC_TYPE_CDP 0x2000
69 static void chdlc_slarp_print(const u_char *, u_int);
71 /* Standard CHDLC printer */
73 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
74 register const u_char *p)
76 register u_int length = h->len;
77 register u_int caplen = h->caplen;
83 if (caplen < CHDLC_HDRLEN) {
89 * Some printers want to get back at the link level addresses,
90 * and/or check that they're not walking off the end of the packet.
91 * Rather than pass them all the way down, we set these globals.
93 proto = ntohs(*(u_short *)&p[2]);
106 printf("0x%02x ", p[0]);
109 printf("%d %04x: ", length, proto);
112 length -= CHDLC_HDRLEN;
113 ip = (struct ip *)(p + CHDLC_HDRLEN);
116 ip_print((const u_char *)ip, length);
120 ip6_print((const u_char *)ip, length);
123 case CHDLC_TYPE_SLARP:
124 chdlc_slarp_print((const u_char *)ip, length);
128 chdlc_cdp_print((const u_char *)ip, length);
133 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
140 #define SLARP_REQUEST 0
141 #define SLARP_REPLY 1
142 #define SLARP_KEEPALIVE 2
162 chdlc_slarp_print(const u_char *cp, u_int length)
164 struct cisco_slarp *slarp;
166 if (length < SLARP_LEN) {
171 slarp = (struct cisco_slarp *)cp;
172 switch (ntohl(slarp->code)) {
174 printf("slarp-request");
177 printf("slarp-reply %s/%s",
178 ipaddr_string(&slarp->un.addr.addr),
179 ipaddr_string(&slarp->un.addr.mask));
181 case SLARP_KEEPALIVE:
182 printf("slarp-keepalive my=0x%x your=0x%x ",
183 (u_int32_t)ntohl(slarp->un.keep.myseq),
184 (u_int32_t)ntohl(slarp->un.keep.yourseq));
185 printf("reliability=0x%04x t1=%d.%d",
186 ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
187 ntohs(slarp->un.keep.t2));
190 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
194 if (SLARP_LEN < length && vflag)
195 printf("(trailing junk: %d bytes)", length - SLARP_LEN);