| /* |
| * 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. |
| */ |
| |
| /* \summary: Cisco HDLC printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <netdissect-stdinc.h> |
| |
| #include "netdissect.h" |
| #include "addrtoname.h" |
| #include "ethertype.h" |
| #include "extract.h" |
| #include "chdlc.h" |
| |
| static void chdlc_slarp_print(netdissect_options *, const u_char *, u_int); |
| |
| static const struct tok chdlc_cast_values[] = { |
| { CHDLC_UNICAST, "unicast" }, |
| { CHDLC_BCAST, "bcast" }, |
| { 0, NULL} |
| }; |
| |
| |
| /* Standard CHDLC printer */ |
| u_int |
| chdlc_if_print(netdissect_options *ndo, 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) { |
| ND_PRINT((ndo, "[|chdlc]")); |
| return (caplen); |
| } |
| return (chdlc_print(ndo, p,length)); |
| } |
| |
| u_int |
| chdlc_print(netdissect_options *ndo, register const u_char *p, u_int length) |
| { |
| u_int proto; |
| |
| proto = EXTRACT_16BITS(&p[2]); |
| if (ndo->ndo_eflag) { |
| ND_PRINT((ndo, "%s, ethertype %s (0x%04x), length %u: ", |
| tok2str(chdlc_cast_values, "0x%02x", p[0]), |
| tok2str(ethertype_values, "Unknown", proto), |
| proto, |
| length)); |
| } |
| |
| length -= CHDLC_HDRLEN; |
| p += CHDLC_HDRLEN; |
| |
| switch (proto) { |
| case ETHERTYPE_IP: |
| ip_print(ndo, p, length); |
| break; |
| case ETHERTYPE_IPV6: |
| ip6_print(ndo, p, length); |
| break; |
| case CHDLC_TYPE_SLARP: |
| chdlc_slarp_print(ndo, p, length); |
| break; |
| #if 0 |
| case CHDLC_TYPE_CDP: |
| chdlc_cdp_print(p, length); |
| break; |
| #endif |
| case ETHERTYPE_MPLS: |
| case ETHERTYPE_MPLS_MULTI: |
| mpls_print(ndo, p, length); |
| break; |
| case ETHERTYPE_ISO: |
| /* is the fudge byte set ? lets verify by spotting ISO headers */ |
| if (*(p+1) == 0x81 || |
| *(p+1) == 0x82 || |
| *(p+1) == 0x83) |
| isoclns_print(ndo, p + 1, length - 1, length - 1); |
| else |
| isoclns_print(ndo, p, length, length); |
| break; |
| default: |
| if (!ndo->ndo_eflag) |
| ND_PRINT((ndo, "unknown CHDLC protocol (0x%04x)", proto)); |
| break; |
| } |
| |
| return (CHDLC_HDRLEN); |
| } |
| |
| /* |
| * The fixed-length portion of a SLARP packet. |
| */ |
| struct cisco_slarp { |
| uint8_t code[4]; |
| #define SLARP_REQUEST 0 |
| #define SLARP_REPLY 1 |
| #define SLARP_KEEPALIVE 2 |
| union { |
| struct { |
| uint8_t addr[4]; |
| uint8_t mask[4]; |
| } addr; |
| struct { |
| uint8_t myseq[4]; |
| uint8_t yourseq[4]; |
| uint8_t rel[2]; |
| } keep; |
| } un; |
| }; |
| |
| #define SLARP_MIN_LEN 14 |
| #define SLARP_MAX_LEN 18 |
| |
| static void |
| chdlc_slarp_print(netdissect_options *ndo, const u_char *cp, u_int length) |
| { |
| const struct cisco_slarp *slarp; |
| u_int sec,min,hrs,days; |
| |
| ND_PRINT((ndo, "SLARP (length: %u), ",length)); |
| if (length < SLARP_MIN_LEN) |
| goto trunc; |
| |
| slarp = (const struct cisco_slarp *)cp; |
| ND_TCHECK2(*slarp, SLARP_MIN_LEN); |
| switch (EXTRACT_32BITS(&slarp->code)) { |
| case SLARP_REQUEST: |
| ND_PRINT((ndo, "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: |
| ND_PRINT((ndo, "reply %s/%s", |
| ipaddr_string(ndo, &slarp->un.addr.addr), |
| ipaddr_string(ndo, &slarp->un.addr.mask))); |
| break; |
| case SLARP_KEEPALIVE: |
| ND_PRINT((ndo, "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; |
| ND_TCHECK2(*cp, 4); |
| sec = EXTRACT_32BITS(cp) / 1000; |
| min = sec / 60; sec -= min * 60; |
| hrs = min / 60; min -= hrs * 60; |
| days = hrs / 24; hrs -= days * 24; |
| ND_PRINT((ndo, ", link uptime=%ud%uh%um%us",days,hrs,min,sec)); |
| } |
| break; |
| default: |
| ND_PRINT((ndo, "0x%02x unknown", EXTRACT_32BITS(&slarp->code))); |
| if (ndo->ndo_vflag <= 1) |
| print_unknown_data(ndo,cp+4,"\n\t",length-4); |
| break; |
| } |
| |
| if (SLARP_MAX_LEN < length && ndo->ndo_vflag) |
| ND_PRINT((ndo, ", (trailing junk: %d bytes)", length - SLARP_MAX_LEN)); |
| if (ndo->ndo_vflag > 1) |
| print_unknown_data(ndo,cp+4,"\n\t",length-4); |
| return; |
| |
| trunc: |
| ND_PRINT((ndo, "[|slarp]")); |
| } |
| |
| |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 8 |
| * End: |
| */ |