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Add SunATM support, based on code from Yen Yen Lim at North Dakota State
[tcpdump] / print-cdp.c
diff --git a/print-cdp.c b/print-cdp.c
index 798b8f060d355f74bdd1a2130284ef38f872d210..c291989db67b3f9d5d89fb79b5f07907d2c40693 100644 (file)
--- a/print-cdp.c
+++ b/print-cdp.c
@@ -26,7 +26,7 @@
 
 #ifndef lint
 static const char rcsid[] =
 
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.2 2000-05-16 23:54:55 assar Exp $";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.14 2002-06-11 17:08:44 itojun Exp $";
 #endif
 
 #ifdef HAVE_CONFIG_H
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -47,129 +47,270 @@ static const char rcsid[] =
 #include "addrtoname.h"
 #include "extract.h"                   /* must come after interface.h */
 
 #include "addrtoname.h"
 #include "extract.h"                   /* must come after interface.h */
 
-static void cdp_print_addr( const u_char * p, int l );
-static void cdp_print_prefixes( const u_char * p, int l );
+static int cdp_print_addr(const u_char *, int);
+static int cdp_print_prefixes(const u_char *, int);
+static unsigned long cdp_get_number(const u_char *, int);
 
 
-/*
- * Returns non-zero IFF it succeeds in printing the header
- */
 void
 cdp_print(const u_char *p, u_int length, u_int caplen,
          const u_char *esrc, const u_char *edst)
 {
 void
 cdp_print(const u_char *p, u_int length, u_int caplen,
          const u_char *esrc, const u_char *edst)
 {
-       int i;
+       u_int i;
        int type, len;
 
        /* Cisco Discovery Protocol */
 
        int type, len;
 
        /* Cisco Discovery Protocol */
 
-
-       if ( caplen < 12 ) {
+       if (caplen < 4) {
                (void)printf("[|cdp]");
                return;
        }
 
                (void)printf("[|cdp]");
                return;
        }
 
-       i=8;            /* CDP data starts at offset 8 */
-       printf ("CDP v%d, ttl=%ds", p[i], p[i+1] );
-       i+=4;           /* skip version, TTL and chksum */
+       i = 0;          /* CDP data starts at offset 0 */
+       printf("CDP v%u, ttl=%us", p[i], p[i + 1]);
+       i += 4;         /* skip version, TTL and chksum */
 
        while (i < length) {
 
        while (i < length) {
-           if ( i+4 > caplen ) {
-               printf("[!cdp]");
-               return;
-           }
-           type = (p[i]<<8) + p[i+1];
-           len  = (p[i+2]<<8) + p[i+3];
+               if (i + 4 > caplen)
+                       goto trunc;
+               type = (p[i] <<  8) + p[i + 1];
+               len  = (p[i + 2] << 8) + p[i + 3];
 
 
-           if ( vflag )
-               printf( "\n\t%02x/%02x", type, len );
-           else
-               printf( "\n\t" );
+               if (vflag > 1)
+                       printf("\n\t");
 
 
-           if ( i+len > caplen ) {
-               printf("[!cdp]");
-               return;
-           }
-
-           switch( type )
-           {
-           case 0x01:
-               printf( " DevID '%.*s'", len-4, p+i+4 );
-               break;
-           case 0x02:
-               printf( " Addr" );
-               cdp_print_addr( p+i+4, len-4 );
-               break;
-           case 0x03:
-               printf( " PortID '%.*s'", len-4, p+i+4 );
-               break;
-           case 0x04:
-               printf( " CAP 0x%02x", (unsigned) p[i+7] );
-               break;
-           case 0x05:
-               if ( vflag )
-                   printf( " Version:\n%.*s", len-4, p+i+4 );
-               else
-                   printf( " Version: (suppressed)" );
-               break;
-           case 0x06:
-               printf( " Platform: '%.*s'", len-4, p+i+4 );
-               break;
-           case 0x07:
-               cdp_print_prefixes( p+i+4, len-4 );
-               break;
-           default:
-               printf( " unknown field type %02x, len %d", type, len );
-           }
-           i+=len;
+               if (vflag)
+                       printf(" %02x/%02x", type, len);
 
 
+               if (i + len > caplen)
+                       goto trunc;
+
+               switch (type) {
+               case 0x00:
+                       printf(" Goodbye");
+                       break;
+               case 0x01:
+                       printf(" DevID '%.*s'", len - 4, p + i + 4);
+                       break;
+               case 0x02:
+                       printf(" Addr");
+                       if (cdp_print_addr(p + i + 4, len - 4) < 0)
+                               goto trunc;
+                       break;
+               case 0x03:
+                       printf(" PortID '%.*s'", len - 4, p + i + 4);
+                       break;
+               case 0x04:
+                       printf(" CAP 0x%02x", (unsigned) p[i + 7]);
+                       break;
+               case 0x05:
+                       if (vflag > 1)
+                               printf(" Version:\n%.*s", len - 4, p + i + 4);
+                       else
+                               printf(" Version: (suppressed)");
+                       break;
+               case 0x06:
+                       printf(" Platform: '%.*s'", len - 4, p + i + 4);
+                       break;
+               case 0x07:
+                       if (cdp_print_prefixes(p + i + 4, len - 4) < 0)
+                               goto trunc;
+                       break;
+               case 0x08:              /* guess - not documented */
+                       printf(" Protocol-Hello option" );
+                       break;
+               case 0x09:              /* guess - not documented */
+                       printf(" VTP Management Domain: '%.*s'", len - 4,
+                           p + i + 4);
+                       break;
+               case 0x0a:              /* guess - not documented */
+                       printf(" Native VLAN ID: %d",
+                           (p[i + 4] << 8) + p[i + 4 + 1] );
+                       break;
+               case 0x0b:              /* guess - not documented */
+                       printf(" Duplex: %s", p[i + 4] ? "full": "half");
+                       break;
+/* http://www.cisco.com/univercd/cc/td/doc/product/voice/ata/atarn/186rn21m.htm
+ * plus more details from other sources
+ */
+               case 0x0e:              /* incomplete doc. */
+                       printf(" ATA-186 VoIP VLAN request, app %d, vlan %d",
+                               p[i + 4], EXTRACT_16BITS(&p[i+4+1]));
+                       break;
+               case 0x0f:              /* incomplete doc. */
+                       printf(" ATA-186 VoIP VLAN assignment" );
+                       break;
+               case 0x10:              /* incomplete doc. */
+                       printf(" power consumption: %1.2fW",
+                               cdp_get_number(p+i+4, len-4)/1000.0 );
+                       break;
+               case 0x11:              /* guess - not documented */
+                       printf(" MTU %u bytes", EXTRACT_32BITS(&p[i+4]));
+                       break;
+               case 0x12:              /* guess - not documented */
+                       printf(" AVVID trust bitmap 0x%02x", p[i+4] );
+                       break;
+               case 0x13:              /* guess - not documented */
+                       printf(" AVVID untrusted ports CoS: 0x%02x", p[i+4]);
+                       break;
+               case 0x14:              /* guess - not documented */
+                       printf(" sysName='%.*s'", len - 4, p + i + 4 );
+                       break;
+               case 0x15:              /* guess - not documented */
+                       printf(" sysObjectID" );                /* TODO */
+                       break;
+               case 0x16:              /* guess - not documented */
+                       printf(" management address(es)" );
+                       break;
+               case 0x17:              /* guess - not documented */
+                       printf(" phys. location 0x%02x/%.*s",
+                               p[i+4], len - 5, p + i + 5 );
+                       break;
+               default:
+                       printf(" unknown field type %02x, len %d", type, len);
+                       break;
+               }
+
+               /* avoid infinite loop */
+               if (len == 0)
+                       break;
+               i += len;
        }
        }
+
+       return;
+
+trunc:
+       printf("[|cdp]");
 }
 
 }
 
-static void
-cdp_print_addr( const u_char * p, int l )
+/*
+ * Protocol type values.
+ *
+ * PT_NLPID means that the protocol type field contains an OSI NLPID.
+ *
+ * PT_IEEE_802_2 means that the protocol type field contains an IEEE 802.2
+ * LLC header that specifies that the payload is for that protocol.
+ */
+#define PT_NLPID               1       /* OSI NLPID */
+#define PT_IEEE_802_2          2       /* IEEE 802.2 LLC header */
+
+static int
+cdp_print_addr(const u_char * p, int l)
 {
 {
-       int pl, al, num;
-       const u_char * endp = p+l;
-
-       num = (p[0] << 24) + (p[1]<<16) + (p[2]<<8)+ p[3];
-       p+=4;
-
-       printf(" (%d): ", num );
-
-       while( p < endp && num >= 0) {
-               pl=*(p+1);
-               p+=2; 
-
-               /* special case: IPv4, protocol type=0xcc, addr. length=4 */
-               if ( pl == 1 && *p == 0xcc && 
-                    p[1] == 0 && p[2] == 4 ) {
-                       p+=3;
-
-                       printf( "IPv4 %d.%d.%d.%d ", p[0], p[1], p[2], p[3] );
-                       p+=4;
-               } else {        /* generic case: just print raw data */
-                       printf("pt=0x%02x, pl=%d, pb=", *(p-2), pl);
-                       while( pl-- > 0 )
-                               printf( " %02x", *p++);
-                       al=(*p << 8) + *(p+1);
-                       printf( ", al=%d, a=", al );
-                       p+=2; 
-                       while( al-- > 0 )
-                               printf( " %02x", *p++);
+       int pt, pl, al, num;
+       const u_char *endp = p + l;
+#ifdef INET6
+       static u_char prot_ipv6[] = {
+               0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd
+       };
+#endif
+
+       num = EXTRACT_32BITS(p);
+       p += 4;
+
+       printf(" (%d): ", num);
+
+       while (p < endp && num >= 0) {
+               if (p + 2 > endp)
+                       goto trunc;
+               pt = p[0];              /* type of "protocol" field */
+               pl = p[1];              /* length of "protocol" field */
+               p += 2;
+
+               if (p + pl + 2 > endp)
+                       goto trunc;
+               al = EXTRACT_16BITS(&p[pl]);    /* address length */
+
+               if (pt == PT_NLPID && pl == 1 && *p == 0xcc && al == 4) {
+                       /*
+                        * IPv4: protocol type = NLPID, protocol length = 1
+                        * (1-byte NLPID), protocol = 0xcc (NLPID for IPv4),
+                        * address length = 4
+                        */
+                       p += 3;
+
+                       if (p + 4 > endp)
+                               goto trunc;
+                       printf("IPv4 %u.%u.%u.%u", p[0], p[1], p[2], p[3]);
+                       p += 4;
+               }
+#ifdef INET6
+               else if (pt == PT_IEEE_802_2 && pl == 8 &&
+                   memcmp(p, prot_ipv6, 8) == 0 && al == 16) {
+                       /*
+                        * IPv6: protocol type = IEEE 802.2 header,
+                        * protocol length = 8 (size of LLC+SNAP header),
+                        * protocol = LLC+SNAP header with the IPv6
+                        * Ethertype, address length = 16
+                        */
+                       p += 10;
+                       if (p + al > endp)
+                               goto trunc;
+
+                       printf("IPv6 %s", ip6addr_string(p));
+                       p += al;
+               }
+#endif
+               else {
+                       /*
+                        * Generic case: just print raw data
+                        */
+                       if (p + pl > endp)
+                               goto trunc;
+                       printf("pt=0x%02x, pl=%d, pb=", *(p - 2), pl);
+                       while (pl-- > 0)
+                               printf(" %02x", *p++);
+                       if (p + 2 > endp)
+                               goto trunc;
+                       al = (*p << 8) + *(p + 1);
+                       printf(", al=%d, a=", al);
+                       p += 2;
+                       if (p + al > endp)
+                               goto trunc;
+                       while (al-- > 0)
+                               printf(" %02x", *p++);
                }
                }
-               printf("  ");
                num--;
                num--;
+               if (num)
+                       printf(" ");
        }
        }
+
+       return 0;
+
+trunc:
+       return -1;
 }
 
 
 }
 
 
-static void
-cdp_print_prefixes( const u_char * p, int l )
+static int
+cdp_print_prefixes(const u_char * p, int l)
 {
 {
-    printf( " IPv4 Prefixes (%d):", l/5 );
+       if (l % 5)
+               goto trunc;
+
+       printf(" IPv4 Prefixes (%d):", l / 5);
+
+       while (l > 0) {
+               printf(" %u.%u.%u.%u/%u", p[0], p[1], p[2], p[3], p[4]);
+               l -= 5;
+               p += 5;
+       }
+
+       return 0;
 
 
-    while(l > 0) {
-       printf( " %d.%d.%d.%d/%d", p[0], p[1], p[2], p[3], p[4] );
-       l-=5; p+=5;
+trunc:
+       return -1;
+}
+
+/* read in a <n>-byte number, MSB first
+ * (of course this can handle max sizeof(long))
+ */
+static unsigned long cdp_get_number(const u_char * p, int l)
+{
+    unsigned long res=0;
+    while( l>0 )
+    {
+       res = (res<<8) + *p;
+       p++; l--;
     }
     }
+    return res;
 }
 }
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