#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.8 2001-06-15 20:52:12 fenner Exp $";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.14 2002-06-11 17:08:44 itojun Exp $";
#endif
#ifdef HAVE_CONFIG_H
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);
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 */
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] - 1);
+ (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;
printf("[|cdp]");
}
+/*
+ * 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;
+ 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 = (p[0] << 24) + (p[1] << 16) + (p[2] << 8) + p[3];
+ num = EXTRACT_32BITS(p);
p += 4;
printf(" (%d): ", num);
while (p < endp && num >= 0) {
if (p + 2 > endp)
goto trunc;
- pl = p[1];
+ pt = p[0]; /* type of "protocol" field */
+ pl = p[1]; /* length of "protocol" field */
p += 2;
- /* special case: IPv4, protocol type=0xcc, addr. length=4 */
- if (p + 3 > endp)
+ if (p + pl + 2 > endp)
goto trunc;
- if (pl == 1 && *p == 0xcc && p[1] == 0 && p[2] == 4) {
+ 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]);
+ printf("IPv4 %u.%u.%u.%u", p[0], p[1], p[2], p[3]);
p += 4;
- } else { /* generic case: just print raw data */
+ }
+#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++);
- al = (*p << 8) + *(p + 1);
- if (p + 2 + al > endp)
+ 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--;
+ if (num)
+ printf(" ");
}
return 0;
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;
+}
projects / tcpdump / blobdiff