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Diffstat (limited to 'contrib/tcpdump/print-chdlc.c')
| -rw-r--r-- | contrib/tcpdump/print-chdlc.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-chdlc.c b/contrib/tcpdump/print-chdlc.c new file mode 100644 index 0000000..244119f --- /dev/null +++ b/contrib/tcpdump/print-chdlc.c @@ -0,0 +1,214 @@ +/* + * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 + * 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 const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.32.2.8 2005/08/23 10:29:42 hannes Exp $ (LBL)"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <tcpdump-stdinc.h> + +#include <pcap.h> +#include <stdio.h> + +#include "interface.h" +#include "addrtoname.h" +#include "ethertype.h" +#include "extract.h" +#include "ppp.h" +#include "chdlc.h" + +static void chdlc_slarp_print(const u_char *, u_int); + +/* Standard CHDLC printer */ +u_int +chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) +{ + register u_int length = h->len; + register u_int caplen = h->caplen; + + if (caplen < CHDLC_HDRLEN) { + printf("[|chdlc]"); + return (caplen); + } + return (chdlc_print(p,length)); +} + +u_int +chdlc_print(register const u_char *p, u_int length) { + u_int proto; + const struct ip *ip; + + proto = EXTRACT_16BITS(&p[2]); + if (eflag) { + switch (p[0]) { + case CHDLC_UNICAST: + printf("unicast "); + break; + case CHDLC_BCAST: + printf("bcast "); + break; + default: + printf("0x%02x ", p[0]); + break; + } + printf("%d %04x: ", length, proto); + } + + length -= CHDLC_HDRLEN; + ip = (const struct ip *)(p + CHDLC_HDRLEN); + switch (proto) { + case ETHERTYPE_IP: + ip_print(gndo, (const u_char *)ip, length); + break; +#ifdef INET6 + case ETHERTYPE_IPV6: + ip6_print((const u_char *)ip, length); + break; +#endif + case CHDLC_TYPE_SLARP: + chdlc_slarp_print((const u_char *)ip, length); + break; +#if 0 + case CHDLC_TYPE_CDP: + chdlc_cdp_print((const u_char *)ip, length); + break; +#endif + case ETHERTYPE_MPLS: + case ETHERTYPE_MPLS_MULTI: + mpls_print((const u_char *)(ip), length); + break; + case ETHERTYPE_ISO: + /* is the fudge byte set ? lets verify by spotting ISO headers */ + if (*(p+CHDLC_HDRLEN+1) == 0x81 || + *(p+CHDLC_HDRLEN+1) == 0x82 || + *(p+CHDLC_HDRLEN+1) == 0x83) + isoclns_print(p+CHDLC_HDRLEN+1, length-1, length-1); + else + isoclns_print(p+CHDLC_HDRLEN, length, length); + break; + default: + printf("unknown CHDLC protocol (0x%04x)", proto); + break; + } + + return (CHDLC_HDRLEN); +} + +/* + * The fixed-length portion of a SLARP packet. + */ +struct cisco_slarp { + u_int8_t code[4]; +#define SLARP_REQUEST 0 +#define SLARP_REPLY 1 +#define SLARP_KEEPALIVE 2 + union { + struct { + u_int8_t addr[4]; + u_int8_t mask[4]; + } addr; + struct { + u_int8_t myseq[4]; + u_int8_t yourseq[4]; + u_int8_t rel[2]; + } keep; + } un; +}; + +#define SLARP_MIN_LEN 14 +#define SLARP_MAX_LEN 18 + +static void +chdlc_slarp_print(const u_char *cp, u_int length) +{ + const struct cisco_slarp *slarp; + u_int sec,min,hrs,days; + + printf("SLARP (length: %u), ",length); + if (length < SLARP_MIN_LEN) + goto trunc; + + slarp = (const struct cisco_slarp *)cp; + TCHECK2(*slarp, SLARP_MIN_LEN); + switch (EXTRACT_32BITS(&slarp->code)) { + case SLARP_REQUEST: + printf("request"); + /* + * At least according to William "Chops" Westfield's + * message in + * + * http://www.nethelp.no/net/cisco-hdlc.txt + * + * the address and mask aren't used in requests - + * they're just zero. + */ + break; + case SLARP_REPLY: + printf("reply %s/%s", + ipaddr_string(&slarp->un.addr.addr), + ipaddr_string(&slarp->un.addr.mask)); + break; + case SLARP_KEEPALIVE: + printf("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x", + EXTRACT_32BITS(&slarp->un.keep.myseq), + EXTRACT_32BITS(&slarp->un.keep.yourseq), + EXTRACT_16BITS(&slarp->un.keep.rel)); + + if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */ + cp += SLARP_MIN_LEN; + if (!TTEST2(*cp, 4)) + goto trunc; + sec = EXTRACT_32BITS(cp) / 1000; + min = sec / 60; sec -= min * 60; + hrs = min / 60; min -= hrs * 60; + days = hrs / 24; hrs -= days * 24; + printf(", link uptime=%ud%uh%um%us",days,hrs,min,sec); + } + break; + default: + printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code)); + if (vflag <= 1) + print_unknown_data(cp+4,"\n\t",length-4); + break; + } + + if (SLARP_MAX_LEN < length && vflag) + printf(", (trailing junk: %d bytes)", length - SLARP_MAX_LEN); + if (vflag > 1) + print_unknown_data(cp+4,"\n\t",length-4); + return; + +trunc: + printf("[|slarp]"); +} + + +/* + * Local Variables: + * c-style: whitesmith + * c-basic-offset: 8 + * End: + */ |
