-/* maybe it should be merged into print-ppp.c */
/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.17 2002-09-20 10:02:42 hannes Exp $ (LBL)";
+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
static void chdlc_slarp_print(const u_char *, u_int);
/* Standard CHDLC printer */
-void
-chdlc_if_print(u_char *user _U_, const struct pcap_pkthdr *h,
- register const u_char *p)
+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;
-
- ++infodelay;
- ts_print(&h->ts);
-
- /*
- * Some printers want to get back at the link level addresses,
- * and/or check that they're not walking off the end of the packet.
- * Rather than pass them all the way down, we set these globals.
- */
- packetp = p;
- snapend = p + caplen;
-
- chdlc_print(p, length, caplen);
-
- putchar('\n');
- --infodelay;
- if (infoprint)
- info(0);
-}
-
-void
-chdlc_print(register const u_char *p, u_int length, u_int caplen)
-{
const struct ip *ip;
u_int proto;
if (caplen < CHDLC_HDRLEN) {
printf("[|chdlc]");
- return;
+ return (caplen);
}
proto = EXTRACT_16BITS(&p[2]);
ip = (const struct ip *)(p + CHDLC_HDRLEN);
switch (proto) {
case ETHERTYPE_IP:
- ip_print((const u_char *)ip, length);
+ ip_print(gndo, (const u_char *)ip, length);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
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:
- isoclns_print(p+CHDLC_HDRLEN, length, length, NULL, NULL);
+ /* 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;
}
- if (xflag)
- default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
+
+ 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]");
- return;
- }
+ printf("SLARP (length: %u), ",length);
+ if (length < SLARP_MIN_LEN)
+ goto trunc;
slarp = (const struct cisco_slarp *)cp;
- switch (ntohl(slarp->code)) {
+ TCHECK2(*slarp, SLARP_MIN_LEN);
+ switch (EXTRACT_32BITS(&slarp->code)) {
case SLARP_REQUEST:
- printf("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("slarp-reply %s/%s",
+ printf("reply %s/%s",
ipaddr_string(&slarp->un.addr.addr),
ipaddr_string(&slarp->un.addr.mask));
break;
case SLARP_KEEPALIVE:
- printf("slarp-keepalive my=0x%x your=0x%x ",
- (u_int32_t)ntohl(slarp->un.keep.myseq),
- (u_int32_t)ntohl(slarp->un.keep.yourseq));
- printf("reliability=0x%04x t1=%d.%d",
- ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
- ntohs(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("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
+ printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code));
+ if (vflag <= 1)
+ print_unknown_data(cp+4,"\n\t",length-4);
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