205 lines
5.8 KiB
C
Executable File
205 lines
5.8 KiB
C
Executable File
/*
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* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ethertype.h"
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#include "extract.h"
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#include "chdlc.h"
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static void chdlc_slarp_print(netdissect_options *, const u_char *, u_int);
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static const struct tok chdlc_cast_values[] = {
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{ CHDLC_UNICAST, "unicast" },
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{ CHDLC_BCAST, "bcast" },
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{ 0, NULL}
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};
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/* Standard CHDLC printer */
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u_int
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chdlc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
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{
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register u_int length = h->len;
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register u_int caplen = h->caplen;
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if (caplen < CHDLC_HDRLEN) {
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ND_PRINT((ndo, "[|chdlc]"));
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return (caplen);
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}
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return (chdlc_print(ndo, p,length));
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}
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u_int
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chdlc_print(netdissect_options *ndo, register const u_char *p, u_int length)
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{
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u_int proto;
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proto = EXTRACT_16BITS(&p[2]);
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if (ndo->ndo_eflag) {
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ND_PRINT((ndo, "%s, ethertype %s (0x%04x), length %u: ",
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tok2str(chdlc_cast_values, "0x%02x", p[0]),
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tok2str(ethertype_values, "Unknown", proto),
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proto,
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length));
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}
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length -= CHDLC_HDRLEN;
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p += CHDLC_HDRLEN;
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switch (proto) {
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case ETHERTYPE_IP:
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ip_print(ndo, p, length);
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break;
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case ETHERTYPE_IPV6:
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ip6_print(ndo, p, length);
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break;
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case CHDLC_TYPE_SLARP:
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chdlc_slarp_print(ndo, p, length);
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break;
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#if 0
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case CHDLC_TYPE_CDP:
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chdlc_cdp_print(p, length);
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break;
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#endif
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case ETHERTYPE_MPLS:
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case ETHERTYPE_MPLS_MULTI:
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mpls_print(ndo, p, length);
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break;
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case ETHERTYPE_ISO:
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/* is the fudge byte set ? lets verify by spotting ISO headers */
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if (*(p+1) == 0x81 ||
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*(p+1) == 0x82 ||
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*(p+1) == 0x83)
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isoclns_print(ndo, p + 1, length - 1, length - 1);
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else
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isoclns_print(ndo, p, length, length);
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break;
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default:
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if (!ndo->ndo_eflag)
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ND_PRINT((ndo, "unknown CHDLC protocol (0x%04x)", proto));
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break;
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}
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return (CHDLC_HDRLEN);
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}
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/*
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* The fixed-length portion of a SLARP packet.
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*/
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struct cisco_slarp {
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uint8_t code[4];
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#define SLARP_REQUEST 0
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#define SLARP_REPLY 1
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#define SLARP_KEEPALIVE 2
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union {
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struct {
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uint8_t addr[4];
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uint8_t mask[4];
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} addr;
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struct {
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uint8_t myseq[4];
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uint8_t yourseq[4];
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uint8_t rel[2];
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} keep;
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} un;
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};
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#define SLARP_MIN_LEN 14
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#define SLARP_MAX_LEN 18
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static void
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chdlc_slarp_print(netdissect_options *ndo, const u_char *cp, u_int length)
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{
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const struct cisco_slarp *slarp;
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u_int sec,min,hrs,days;
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ND_PRINT((ndo, "SLARP (length: %u), ",length));
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if (length < SLARP_MIN_LEN)
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goto trunc;
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slarp = (const struct cisco_slarp *)cp;
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ND_TCHECK2(*slarp, SLARP_MIN_LEN);
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switch (EXTRACT_32BITS(&slarp->code)) {
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case SLARP_REQUEST:
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ND_PRINT((ndo, "request"));
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/*
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* At least according to William "Chops" Westfield's
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* message in
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*
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* http://www.nethelp.no/net/cisco-hdlc.txt
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*
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* the address and mask aren't used in requests -
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* they're just zero.
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*/
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break;
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case SLARP_REPLY:
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ND_PRINT((ndo, "reply %s/%s",
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ipaddr_string(ndo, &slarp->un.addr.addr),
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ipaddr_string(ndo, &slarp->un.addr.mask)));
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break;
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case SLARP_KEEPALIVE:
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ND_PRINT((ndo, "keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x",
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EXTRACT_32BITS(&slarp->un.keep.myseq),
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EXTRACT_32BITS(&slarp->un.keep.yourseq),
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EXTRACT_16BITS(&slarp->un.keep.rel)));
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if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */
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cp += SLARP_MIN_LEN;
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ND_TCHECK2(*cp, 4);
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sec = EXTRACT_32BITS(cp) / 1000;
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min = sec / 60; sec -= min * 60;
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hrs = min / 60; min -= hrs * 60;
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days = hrs / 24; hrs -= days * 24;
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ND_PRINT((ndo, ", link uptime=%ud%uh%um%us",days,hrs,min,sec));
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}
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break;
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default:
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ND_PRINT((ndo, "0x%02x unknown", EXTRACT_32BITS(&slarp->code)));
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if (ndo->ndo_vflag <= 1)
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print_unknown_data(ndo,cp+4,"\n\t",length-4);
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break;
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}
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if (SLARP_MAX_LEN < length && ndo->ndo_vflag)
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ND_PRINT((ndo, ", (trailing junk: %d bytes)", length - SLARP_MAX_LEN));
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if (ndo->ndo_vflag > 1)
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print_unknown_data(ndo,cp+4,"\n\t",length-4);
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return;
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trunc:
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ND_PRINT((ndo, "[|slarp]"));
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}
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/*
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* Local Variables:
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* c-style: whitesmith
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* c-basic-offset: 8
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* End:
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*/
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