X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/d3d90f29e50f07c62e58b30016bf169fc96e5b54..refs/heads/tcpdump-4.9:/print-chdlc.c diff --git a/print-chdlc.c b/print-chdlc.c index ec5855a2..24acfbd2 100644 --- a/print-chdlc.c +++ b/print-chdlc.c @@ -19,166 +19,192 @@ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static const char rcsid[] _U_ = - "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.31 2004-03-24 00:45:39 guy Exp $ (LBL)"; -#endif +/* \summary: Cisco HDLC printer */ #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include - -#include -#include +#include -#include "interface.h" +#include "netdissect.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); +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(const struct pcap_pkthdr *h, register const u_char *p) +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; - const struct ip *ip; - u_int proto; + return chdlc_print(ndo, p, h->len); +} - if (caplen < CHDLC_HDRLEN) { - printf("[|chdlc]"); - return (caplen); - } +u_int +chdlc_print(netdissect_options *ndo, register const u_char *p, u_int length) +{ + u_int proto; + const u_char *bp = p; + if (length < CHDLC_HDRLEN) + goto trunc; + ND_TCHECK2(*p, CHDLC_HDRLEN); 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); + 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; - ip = (const struct ip *)(p + CHDLC_HDRLEN); + p += CHDLC_HDRLEN; + switch (proto) { case ETHERTYPE_IP: - ip_print((const u_char *)ip, length); + ip_print(ndo, p, length); break; -#ifdef INET6 case ETHERTYPE_IPV6: - ip6_print((const u_char *)ip, length); + ip6_print(ndo, p, length); break; -#endif case CHDLC_TYPE_SLARP: - chdlc_slarp_print((const u_char *)ip, length); + chdlc_slarp_print(ndo, p, length); break; #if 0 case CHDLC_TYPE_CDP: - chdlc_cdp_print((const u_char *)ip, length); + chdlc_cdp_print(p, length); break; #endif case ETHERTYPE_MPLS: case ETHERTYPE_MPLS_MULTI: - mpls_print((const u_char *)(ip), length); + mpls_print(ndo, p, 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); + if (length < 2) + goto trunc; + ND_TCHECK_16BITS(p); + if (*(p+1) == 0x81 || + *(p+1) == 0x82 || + *(p+1) == 0x83) + isoclns_print(ndo, p + 1, length - 1); else - isoclns_print(p+CHDLC_HDRLEN, length, length); + isoclns_print(ndo, p, length); break; default: - printf("unknown CHDLC protocol (0x%04x)", proto); + if (!ndo->ndo_eflag) + ND_PRINT((ndo, "unknown CHDLC protocol (0x%04x)", proto)); break; } return (CHDLC_HDRLEN); + +trunc: + ND_PRINT((ndo, "[|chdlc]")); + return ndo->ndo_snapend - bp; } +/* + * The fixed-length portion of a SLARP packet. + */ struct cisco_slarp { - u_int32_t code; + uint8_t code[4]; #define SLARP_REQUEST 0 #define SLARP_REPLY 1 #define SLARP_KEEPALIVE 2 union { struct { - struct in_addr addr; - struct in_addr mask; - u_int16_t unused[3]; + uint8_t addr[4]; + uint8_t mask[4]; } addr; struct { - u_int32_t myseq; - u_int32_t yourseq; - u_int16_t rel; - u_int16_t t1; - u_int16_t t2; + uint8_t myseq[4]; + uint8_t yourseq[4]; + uint8_t rel[2]; } keep; } un; }; -#define SLARP_LEN 18 +#define SLARP_MIN_LEN 14 +#define SLARP_MAX_LEN 18 static void -chdlc_slarp_print(const u_char *cp, u_int length) +chdlc_slarp_print(netdissect_options *ndo, const u_char *cp, u_int length) { const struct cisco_slarp *slarp; + u_int sec,min,hrs,days; - if (length < SLARP_LEN) + ND_PRINT((ndo, "SLARP (length: %u), ",length)); + if (length < SLARP_MIN_LEN) goto trunc; slarp = (const struct cisco_slarp *)cp; - TCHECK(*slarp); - printf("SLARP (length: %u), ",length); + ND_TCHECK2(*slarp, SLARP_MIN_LEN); switch (EXTRACT_32BITS(&slarp->code)) { case SLARP_REQUEST: - printf("request"); - /* ok we do not know it - but lets at least dump it */ - print_unknown_data(cp+4,"\n\t",length-4); + 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: - printf("reply %s/%s", - ipaddr_string(&slarp->un.addr.addr), - ipaddr_string(&slarp->un.addr.mask)); + ND_PRINT((ndo, "reply %s/%s", + ipaddr_string(ndo, &slarp->un.addr.addr), + ipaddr_string(ndo, &slarp->un.addr.mask))); break; case SLARP_KEEPALIVE: - printf("keepalive: mineseen=0x%08x, yourseen=0x%08x", - EXTRACT_32BITS(&slarp->un.keep.myseq), - EXTRACT_32BITS(&slarp->un.keep.yourseq)); - printf(", reliability=0x%04x, t1=%d.%d", - EXTRACT_16BITS(&slarp->un.keep.rel), - EXTRACT_16BITS(&slarp->un.keep.t1), - EXTRACT_16BITS(&slarp->un.keep.t2)); + 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: - printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code)); - if (vflag <= 1) - print_unknown_data(cp+4,"\n\t",length-4); + 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_LEN < length && vflag) - printf(", (trailing junk: %d bytes)", length - SLARP_LEN); - if (vflag > 1) - print_unknown_data(cp+4,"\n\t",length-4); + 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: - printf("[|slarp]"); + ND_PRINT((ndo, "[|slarp]")); } + + +/* + * Local Variables: + * c-style: whitesmith + * c-basic-offset: 8 + * End: + */