#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)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.32.2.11 2005-11-29 08:57:10 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
static void chdlc_slarp_print(const u_char *, u_int);
+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)
{
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);
}
+ return (chdlc_print(p,length));
+}
+
+u_int
+chdlc_print(register const u_char *p, u_int length) {
+ u_int proto;
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);
+ printf("%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(gndo, p, length);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
- ip6_print((const u_char *)ip, length);
+ ip6_print(p, length);
break;
#endif
case CHDLC_TYPE_SLARP:
- chdlc_slarp_print((const u_char *)ip, length);
+ chdlc_slarp_print(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(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 (*(p+1) == 0x81 ||
+ *(p+1) == 0x82 ||
+ *(p+1) == 0x83)
+ isoclns_print(p+1, length-1, length-1);
else
- isoclns_print(p+CHDLC_HDRLEN, length, length);
+ isoclns_print(p, length, length);
break;
default:
- printf("unknown CHDLC protocol (0x%04x)", proto);
+ if (!eflag)
+ printf("unknown CHDLC protocol (0x%04x)", proto);
break;
}
return (CHDLC_HDRLEN);
}
+/*
+ * The fixed-length portion of a SLARP packet.
+ */
struct cisco_slarp {
- u_int32_t code;
+ u_int8_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];
+ u_int8_t addr[4];
+ u_int8_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;
+ u_int8_t myseq[4];
+ u_int8_t yourseq[4];
+ u_int8_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)
{
const struct cisco_slarp *slarp;
+ u_int sec,min,hrs,days;
- if (length < SLARP_LEN)
+ printf("SLARP (length: %u), ",length);
+ if (length < SLARP_MIN_LEN)
goto trunc;
slarp = (const struct cisco_slarp *)cp;
- TCHECK(*slarp);
- printf("SLARP (length: %u), ",length);
+ 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);
+ /*
+ * 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.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));
+ 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));
break;
}
- if (SLARP_LEN < length && vflag)
- printf(", (trailing junk: %d bytes)", length - SLARP_LEN);
+ 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:
+ */
projects / tcpdump / blobdiff