/* * 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 1.32.2.7 2005/04/27 14:35:56 hannes Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #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; const struct ip *ip; u_int proto; if (caplen < CHDLC_HDRLEN) { printf("[|chdlc]"); return (caplen); } 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: */