X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/69cb46af9119e8b5554bcc4bf1bf36f39cb82131..a8abce5c5e2dce2ba6dbccd5d3829da104b80f9c:/print-ripng.c

diff --git a/print-ripng.c b/print-ripng.c
index afe1c5e6..15a9aff7 100644
--- a/print-ripng.c
+++ b/print-ripng.c
@@ -19,15 +19,15 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
+/* \summary: IPv6 Routing Information Protocol (RIPng) printer */
+
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
 #endif
 
-#ifdef INET6
-
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
 
-#include "interface.h"
+#include "netdissect.h"
 #include "addrtoname.h"
 #include "extract.h"
 
@@ -65,19 +65,19 @@
 #define	RIP6_RESPONSE	2
 
 struct netinfo6 {
-	struct in6_addr	rip6_dest;
-	uint16_t	rip6_tag;
-	uint8_t		rip6_plen;
-	uint8_t		rip6_metric;
+	nd_ipv6		rip6_dest;
+	nd_uint16_t	rip6_tag;
+	nd_uint8_t	rip6_plen;
+	nd_uint8_t	rip6_metric;
 };
 
 struct	rip6 {
-	uint8_t		rip6_cmd;
-	uint8_t		rip6_vers;
-	uint8_t		rip6_res1[2];
+	nd_uint8_t	rip6_cmd;
+	nd_uint8_t	rip6_vers;
+	nd_byte		rip6_res1[2];
 	union {
 		struct	netinfo6	ru6_nets[1];
-		char	ru6_tracefile[1];
+		nd_byte	ru6_tracefile[1];
 	} rip6un;
 #define	rip6_nets	rip6un.ru6_nets
 #define	rip6_tracefile	rip6un.ru6_tracefile
@@ -85,91 +85,104 @@ struct	rip6 {
 
 #define	HOPCNT_INFINITY6	16
 
-#if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
-static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
+static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
 {
-    static const struct in6_addr in6addr_any;        /* :: */
-    return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
+    static const struct in6_addr in6addr_any_val;        /* :: */
+    return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0);
 }
-#endif
 
 static int
-rip6_entry_print(netdissect_options *ndo, register const struct netinfo6 *ni, int metric)
+rip6_entry_print(netdissect_options *ndo, const struct netinfo6 *ni, u_int metric)
 {
 	int l;
-	l = ND_PRINT((ndo, "%s/%d", ip6addr_string(ndo, &ni->rip6_dest), ni->rip6_plen));
-	if (ni->rip6_tag)
-		l += ND_PRINT((ndo, " [%d]", EXTRACT_16BITS(&ni->rip6_tag)));
+	uint16_t tag;
+
+	l = ND_PRINT("%s/%u", ip6addr_string(ndo, ni->rip6_dest),
+		     EXTRACT_U_1(ni->rip6_plen));
+	tag = EXTRACT_BE_U_2(ni->rip6_tag);
+	if (tag)
+		l += ND_PRINT(" [%u]", tag);
 	if (metric)
-		l += ND_PRINT((ndo, " (%d)", ni->rip6_metric));
+		l += ND_PRINT(" (%u)", metric);
 	return l;
 }
 
 void
 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
 {
-	register const struct rip6 *rp = (const struct rip6 *)dat;
-	register const struct netinfo6 *ni;
-	register u_int amt;
-	register u_int i;
-	int j;
-	int trunc;
-
-	if (ndo->ndo_snapend < dat)
-		return;
-	amt = ndo->ndo_snapend - dat;
-	i = min(length, amt);
-	if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
-		return;
-	i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
-
-	switch (rp->rip6_cmd) {
+	const struct rip6 *rp = (const struct rip6 *)dat;
+	uint8_t cmd;
+	const struct netinfo6 *ni;
+	unsigned int length_left;
+	u_int j;
+
+	ndo->ndo_protocol = "ripng";
+	ND_TCHECK_1(rp->rip6_cmd);
+	cmd = EXTRACT_U_1(rp->rip6_cmd);
+	switch (cmd) {
 
 	case RIP6_REQUEST:
-		j = length / sizeof(*ni);
-		if (j == 1
-		    &&  rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
-		    &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
-			ND_PRINT((ndo, " ripng-req dump"));
-			break;
+		length_left = length;
+		if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
+			goto trunc;
+		length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
+ 		j = length_left / sizeof(*ni);
+		if (j == 1) {
+			ND_TCHECK_SIZE(rp->rip6_nets);
+			if (EXTRACT_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
+			    && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
+				ND_PRINT(" ripng-req dump");
+				break;
+			}
 		}
-		if (j * sizeof(*ni) != length - 4)
-			ND_PRINT((ndo, " ripng-req %d[%u]:", j, length));
+		if (j * sizeof(*ni) != length_left)
+			ND_PRINT(" ripng-req %u[%u]:", j, length);
 		else
-			ND_PRINT((ndo, " ripng-req %d:", j));
-		trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
-		for (ni = rp->rip6_nets; i >= sizeof(*ni);
-		    i -= sizeof(*ni), ++ni) {
+			ND_PRINT(" ripng-req %u:", j);
+		for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
+		    length_left -= sizeof(*ni), ++ni) {
+			ND_TCHECK_SIZE(ni);
 			if (ndo->ndo_vflag > 1)
-				ND_PRINT((ndo, "\n\t"));
+				ND_PRINT("\n\t");
 			else
-				ND_PRINT((ndo, " "));
+				ND_PRINT(" ");
 			rip6_entry_print(ndo, ni, 0);
 		}
+		if (length_left != 0)
+			goto trunc;
 		break;
 	case RIP6_RESPONSE:
-		j = length / sizeof(*ni);
-		if (j * sizeof(*ni) != length - 4)
-			ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length));
+		length_left = length;
+		if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
+			goto trunc;
+		length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
+		j = length_left / sizeof(*ni);
+		if (j * sizeof(*ni) != length_left)
+			ND_PRINT(" ripng-resp %u[%u]:", j, length);
 		else
-			ND_PRINT((ndo, " ripng-resp %d:", j));
-		trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
-		for (ni = rp->rip6_nets; i >= sizeof(*ni);
-		    i -= sizeof(*ni), ++ni) {
+			ND_PRINT(" ripng-resp %u:", j);
+		for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
+		    length_left -= sizeof(*ni), ++ni) {
+			ND_TCHECK_SIZE(ni);
 			if (ndo->ndo_vflag > 1)
-				ND_PRINT((ndo, "\n\t"));
+				ND_PRINT("\n\t");
 			else
-				ND_PRINT((ndo, " "));
-			rip6_entry_print(ndo, ni, ni->rip6_metric);
+				ND_PRINT(" ");
+			rip6_entry_print(ndo, ni, EXTRACT_U_1(ni->rip6_metric));
 		}
-		if (trunc)
-			ND_PRINT((ndo, "[|ripng]"));
+		if (length_left != 0)
+			goto trunc;
 		break;
 	default:
-		ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length));
+		ND_PRINT(" ripng-%u ?? %u", cmd, length);
 		break;
 	}
-	if (rp->rip6_vers != RIP6_VERSION)
-		ND_PRINT((ndo, " [vers %d]", rp->rip6_vers));
+	ND_TCHECK_1(rp->rip6_vers);
+	if (EXTRACT_U_1(rp->rip6_vers) != RIP6_VERSION)
+		ND_PRINT(" [vers %u]", EXTRACT_U_1(rp->rip6_vers));
+	return;
+
+trunc:
+	nd_print_trunc(ndo);
+	return;
 }
-#endif /* INET6 */