X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/7fd1be1520c42204a6c7ec62ba34b1dd7b0884bb..refs/pull/482/head:/print-vrrp.c

diff --git a/print-vrrp.c b/print-vrrp.c
index 442823f3..a6e23143 100644
--- a/print-vrrp.c
+++ b/print-vrrp.c
@@ -2,6 +2,13 @@
  * Copyright (c) 2000 William C. Fenner.
  *                All rights reserved.
  *
+ * Kevin Steves <ks@hp.se> July 2000
+ * Modified to:
+ * - print version, type string and packet length
+ * - print IP address count if > 1 (-v)
+ * - verify checksum (-v)
+ * - print authentication string (-v)
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that: (1) source code
  * distributions retain the above copyright notice and this paragraph
@@ -16,25 +23,21 @@
  * FOR A PARTICULAR PURPOSE.
  */
 
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.1 2000-05-01 17:35:44 fenner Exp $";
-#endif
-
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
+#include <netdissect-stdinc.h>
 
-#include "interface.h"
+#include "netdissect.h"
 #include "extract.h"
 #include "addrtoname.h"
 
+#include "ip.h"
+#include "ipproto.h"
 /*
- * RFC 2338:
+ * RFC 2338 (VRRP v2):
+ *
  *     0                   1                   2                   3
  *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -54,46 +57,125 @@ static const char rcsid[] =
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    |                     Authentication Data (2)                   |
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ *
+ * RFC 5798 (VRRP v3):
+ *
+ *    0                   1                   2                   3
+ *    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |                    IPv4 Fields or IPv6 Fields                 |
+ *   ...                                                             ...
+ *    |                                                               |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |Version| Type  | Virtual Rtr ID|   Priority    |Count IPvX Addr|
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |(rsvd) |     Max Adver Int     |          Checksum             |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |                                                               |
+ *    +                                                               +
+ *    |                       IPvX Address(es)                        |
+ *    +                                                               +
+ *    |                                                               |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  */
+
+/* Type */
+#define	VRRP_TYPE_ADVERTISEMENT	1
+
+static const struct tok type2str[] = {
+	{ VRRP_TYPE_ADVERTISEMENT,	"Advertisement"	},
+	{ 0,				NULL		}
+};
+
+/* Auth Type */
+#define	VRRP_AUTH_NONE		0
+#define	VRRP_AUTH_SIMPLE	1
+#define	VRRP_AUTH_AH		2
+
+static const struct tok auth2str[] = {
+	{ VRRP_AUTH_NONE,		"none"		},
+	{ VRRP_AUTH_SIMPLE,		"simple"	},
+	{ VRRP_AUTH_AH,			"ah"		},
+	{ 0,				NULL		}
+};
+
 void
-vrrp_print(register const u_char *bp, register u_int len, int ttl)
+vrrp_print(netdissect_options *ndo,
+           register const u_char *bp, register u_int len,
+           register const u_char *bp2, int ttl)
 {
-	printf("vrrp ");
+	int version, type, auth_type = VRRP_AUTH_NONE; /* keep compiler happy */
+	const char *type_s;
+
+	ND_TCHECK(bp[0]);
+	version = (bp[0] & 0xf0) >> 4;
+	type = bp[0] & 0x0f;
+	type_s = tok2str(type2str, "unknown type (%u)", type);
+	ND_PRINT((ndo, "VRRPv%u, %s", version, type_s));
 	if (ttl != 255)
-		printf("[ttl=%d!] ", ttl);
-	TCHECK(bp[3]);
-	if ((bp[0] & 0xf0) != 0x20) {
-		printf("[v=%d]", bp[0] >> 4);
+		ND_PRINT((ndo, ", (ttl %u)", ttl));
+	if (version < 2 || version > 3 || type != VRRP_TYPE_ADVERTISEMENT)
 		return;
+	ND_TCHECK(bp[2]);
+	ND_PRINT((ndo, ", vrid %u, prio %u", bp[1], bp[2]));
+	ND_TCHECK(bp[5]);
+
+	if (version == 2) {
+		auth_type = bp[4];
+		ND_PRINT((ndo, ", authtype %s", tok2str(auth2str, NULL, auth_type)));
+		ND_PRINT((ndo, ", intvl %us, length %u", bp[5], len));
+	} else { /* version == 3 */
+		uint16_t intvl = (bp[4] & 0x0f) << 8 | bp[5];
+		ND_PRINT((ndo, ", intvl %ucs, length %u", intvl, len));
 	}
-	if ((bp[0] & 0x0f) != 1) {
-		printf("[t=%d]", bp[0] & 0x0f);
-		return;
-	}
-	printf("vrid=%d prio=%d", bp[1], bp[2]);
-	TCHECK(bp[5]);
-	if (bp[4] != 0) {
-		printf(" [authtype %d]", bp[4]);
-	}
-	printf(" intvl=%d", bp[5]);
-	if (vflag) {
+
+	if (ndo->ndo_vflag) {
 		int naddrs = bp[3];
 		int i;
 		char c;
 
-		/* check checksum? */
-		printf(" addrs:");
+		if (version == 2 && ND_TTEST2(bp[0], len)) {
+			struct cksum_vec vec[1];
+
+			vec[0].ptr = bp;
+			vec[0].len = len;
+			if (in_cksum(vec, 1))
+				ND_PRINT((ndo, ", (bad vrrp cksum %x)",
+					EXTRACT_16BITS(&bp[6])));
+		}
+
+		if (version == 3 && ND_TTEST2(bp[0], len)) {
+			uint16_t cksum = nextproto4_cksum(ndo, (const struct ip *)bp2, bp,
+				len, len, IPPROTO_VRRP);
+			if (cksum)
+				ND_PRINT((ndo, ", (bad vrrp cksum %x)",
+					EXTRACT_16BITS(&bp[6])));
+		}
+
+		ND_PRINT((ndo, ", addrs"));
+		if (naddrs > 1)
+			ND_PRINT((ndo, "(%d)", naddrs));
+		ND_PRINT((ndo, ":"));
 		c = ' ';
 		bp += 8;
 		for (i = 0; i < naddrs; i++) {
-			TCHECK(bp[3]);
-			printf("%c%s", c, ipaddr_string(bp));
+			ND_TCHECK(bp[3]);
+			ND_PRINT((ndo, "%c%s", c, ipaddr_string(ndo, bp)));
 			c = ',';
 			bp += 4;
 		}
-		/* auth data? */
+		if (version == 2 && auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
+			ND_TCHECK(bp[7]);
+			ND_PRINT((ndo, " auth \""));
+			if (fn_printn(ndo, bp, 8, ndo->ndo_snapend)) {
+				ND_PRINT((ndo, "\""));
+				goto trunc;
+			}
+			ND_PRINT((ndo, "\""));
+		}
 	}
 	return;
 trunc:
-	printf("[|vrrp]");
+	ND_PRINT((ndo, "[|vrrp]"));
 }