add support for AS-PIC cookies

[tcpdump] / print-chdlc.c

diff --git a/print-chdlc.c b/print-chdlc.c
index 14d325a41cdb03808e651d3af08aa20a5e2cafc2..ea1a197af81328e87d608c561049583dfed71859 100644 (file)
--- a/print-chdlc.c
+++ b/print-chdlc.c
@@ -20,8 +20,8 @@
  */
 
 #ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.27 2002-12-19 09:39:11 guy 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
@@ -76,7 +76,7 @@ chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
        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:
@@ -100,9 +100,9 @@ chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
                 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, NULL, NULL);
+                    isoclns_print(p+CHDLC_HDRLEN+1, length-1, length-1);
                 else
-                    isoclns_print(p+CHDLC_HDRLEN, length, length, NULL, NULL);
+                    isoclns_print(p+CHDLC_HDRLEN, length, length);
                 break;
        default:
                 printf("unknown CHDLC protocol (0x%04x)", proto);
@@ -112,46 +112,54 @@ chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
        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;
-        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",
@@ -159,13 +167,21 @@ chdlc_slarp_print(const u_char *cp, u_int length)
                        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));
@@ -174,8 +190,20 @@ chdlc_slarp_print(const u_char *cp, u_int length)
                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:
+ */