X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/c9d84d15c5c4dc8eca7594101fe5026080ed641e..a8c33a5850cd9d2f39e56c06b645c283225d78c4:/print-dvmrp.c

diff --git a/print-dvmrp.c b/print-dvmrp.c
index 41c5183b..7e57a49b 100644
--- a/print-dvmrp.c
+++ b/print-dvmrp.c
@@ -19,41 +19,28 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-dvmrp.c,v 1.15 1999-10-30 05:11:12 itojun Exp $ (LBL)";
-#endif
-
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
+/* \summary: Distance Vector Multicast Routing Protocol printer */
 
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/udp.h>
-#include <netinet/udp_var.h>
-#include <netinet/tcp.h>
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
 
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
+#include "netdissect-stdinc.h"
 
-#include "interface.h"
+#include "netdissect.h"
+#include "extract.h"
 #include "addrtoname.h"
 
 /*
+ * See: RFC 1075 and draft-ietf-idmr-dvmrp-v3
+ *
  * DVMRP message types and flag values shamelessly stolen from
  * mrouted/dvmrp.h.
  */
 #define DVMRP_PROBE		1	/* for finding neighbors */
 #define DVMRP_REPORT		2	/* for reporting some or all routes */
 #define DVMRP_ASK_NEIGHBORS	3	/* sent by mapper, asking for a list */
-					/*
-					 * of this router's neighbors
-					 */
+					/* of this router's neighbors */
 #define DVMRP_NEIGHBORS		4	/* response to such a request */
 #define DVMRP_ASK_NEIGHBORS2	5	/* as above, want new format reply */
 #define DVMRP_NEIGHBORS2	6
@@ -70,290 +57,322 @@ static const char rcsid[] =
 #define DVMRP_NF_DISABLED	0x20	/* administratively disabled */
 #define DVMRP_NF_QUERIER	0x40	/* I am the subnet's querier */
 
-static void print_probe(const u_char *, const u_char *, u_int);
-static void print_report(const u_char *, const u_char *, u_int);
-static void print_neighbors(const u_char *, const u_char *, u_int);
-static void print_neighbors2(const u_char *, const u_char *, u_int);
-static void print_prune(const u_char *, const u_char *, u_int);
-static void print_graft(const u_char *, const u_char *, u_int);
-static void print_graft_ack(const u_char *, const u_char *, u_int);
-
-static u_int32_t target_level;
+static int print_probe(netdissect_options *, const u_char *, const u_char *, u_int);
+static int print_report(netdissect_options *, const u_char *, const u_char *, u_int);
+static int print_neighbors(netdissect_options *, const u_char *, const u_char *, u_int);
+static int print_neighbors2(netdissect_options *, const u_char *, const u_char *, u_int, uint8_t, uint8_t);
+static int print_prune(netdissect_options *, const u_char *);
+static int print_graft(netdissect_options *, const u_char *);
+static int print_graft_ack(netdissect_options *, const u_char *);
 
 void
-dvmrp_print(register const u_char *bp, register u_int len)
+dvmrp_print(netdissect_options *ndo,
+            const u_char *bp, u_int len)
 {
-	register const u_char *ep;
-	register u_char type;
+	const u_char *ep;
+	u_char type;
+	uint8_t major_version, minor_version;
 
-	ep = (const u_char *)snapend;
+	ndo->ndo_protocol = "dvmrp";
+	ep = ndo->ndo_snapend;
 	if (bp >= ep)
 		return;
 
-	type = bp[1];
-	bp += 8;
-	/*
-	 * Skip IGMP header
-	 */
+	ND_TCHECK_1(bp + 1);
+	type = GET_U_1(bp + 1);
 
+	/* Skip IGMP header */
+	bp += 8;
 	len -= 8;
 
 	switch (type) {
 
 	case DVMRP_PROBE:
-		printf(" Probe");
-		if (vflag)
-			print_probe(bp, ep, len);
+		ND_PRINT(" Probe");
+		if (ndo->ndo_vflag) {
+			if (print_probe(ndo, bp, ep, len) < 0)
+				goto trunc;
+		}
 		break;
 
 	case DVMRP_REPORT:
-		printf(" Report");
-		if (vflag)
-			print_report(bp, ep, len);
+		ND_PRINT(" Report");
+		if (ndo->ndo_vflag > 1) {
+			if (print_report(ndo, bp, ep, len) < 0)
+				goto trunc;
+		}
 		break;
 
 	case DVMRP_ASK_NEIGHBORS:
-		printf(" Ask-neighbors(old)");
+		ND_PRINT(" Ask-neighbors(old)");
 		break;
 
 	case DVMRP_NEIGHBORS:
-		printf(" Neighbors(old)");
-		print_neighbors(bp, ep, len);
+		ND_PRINT(" Neighbors(old)");
+		if (print_neighbors(ndo, bp, ep, len) < 0)
+			goto trunc;
 		break;
 
 	case DVMRP_ASK_NEIGHBORS2:
-		printf(" Ask-neighbors2");
+		ND_PRINT(" Ask-neighbors2");
 		break;
 
 	case DVMRP_NEIGHBORS2:
-		printf(" Neighbors2");
+		ND_PRINT(" Neighbors2");
 		/*
-		 * extract version and capabilities from IGMP group
-		 * address field
+		 * extract version from IGMP group address field
 		 */
 		bp -= 4;
-		target_level = (bp[0] << 24) | (bp[1] << 16) |
-		    (bp[2] << 8) | bp[3];
+		ND_TCHECK_4(bp);
+		major_version = GET_U_1(bp + 3);
+		minor_version = GET_U_1(bp + 2);
 		bp += 4;
-		print_neighbors2(bp, ep, len);
+		if (print_neighbors2(ndo, bp, ep, len, major_version,
+		    minor_version) < 0)
+			goto trunc;
 		break;
 
 	case DVMRP_PRUNE:
-		printf(" Prune");
-		print_prune(bp, ep, len);
+		ND_PRINT(" Prune");
+		if (print_prune(ndo, bp) < 0)
+			goto trunc;
 		break;
 
 	case DVMRP_GRAFT:
-		printf(" Graft");
-		print_graft(bp, ep, len);
+		ND_PRINT(" Graft");
+		if (print_graft(ndo, bp) < 0)
+			goto trunc;
 		break;
 
 	case DVMRP_GRAFT_ACK:
-		printf(" Graft-ACK");
-		print_graft_ack(bp, ep, len);
+		ND_PRINT(" Graft-ACK");
+		if (print_graft_ack(ndo, bp) < 0)
+			goto trunc;
 		break;
 
 	default:
-		printf(" [type %d]", type);
+		ND_PRINT(" [type %u]", type);
 		break;
 	}
+	return;
+
+trunc:
+	nd_print_trunc(ndo);
+	return;
 }
 
-static void
-print_report(register const u_char *bp, register const u_char *ep,
-    register u_int len)
+static int
+print_report(netdissect_options *ndo,
+             const u_char *bp, const u_char *ep,
+             u_int len)
 {
-	register u_int32_t mask, origin;
-	register int metric, i, width, done;
+	uint32_t mask, origin;
+	u_int metric, done;
+	u_int i, width;
 
 	while (len > 0) {
 		if (len < 3) {
-			printf(" [|]");
-			return;
+			ND_PRINT(" [|]");
+			return (0);
 		}
-		mask = (u_int32_t)0xff << 24 | bp[0] << 16 | bp[1] << 8 | bp[2];
+		ND_TCHECK_3(bp);
+		mask = (uint32_t)0xff << 24 | GET_U_1(bp) << 16 |
+			GET_U_1(bp + 1) << 8 | GET_U_1(bp + 2);
 		width = 1;
-		if (bp[0])
+		if (GET_U_1(bp))
 			width = 2;
-		if (bp[1])
+		if (GET_U_1(bp + 1))
 			width = 3;
-		if (bp[2])
+		if (GET_U_1(bp + 2))
 			width = 4;
 
-		printf("\n\tMask %s", intoa(htonl(mask)));
+		ND_PRINT("\n\tMask %s", intoa(htonl(mask)));
 		bp += 3;
 		len -= 3;
 		do {
 			if (bp + width + 1 > ep) {
-				printf(" [|]");
-				return;
+				ND_PRINT(" [|]");
+				return (0);
 			}
 			if (len < width + 1) {
-				printf("\n\t  [Truncated Report]");
-				return;
+				ND_PRINT("\n\t  [Truncated Report]");
+				return (0);
 			}
 			origin = 0;
-			for (i = 0; i < width; ++i)
-				origin = origin << 8 | *bp++;
+			for (i = 0; i < width; ++i) {
+				ND_TCHECK_1(bp);
+				origin = origin << 8 | GET_U_1(bp);
+				bp++;
+			}
 			for ( ; i < 4; ++i)
 				origin <<= 8;
 
-			metric = *bp++;
+			ND_TCHECK_1(bp);
+			metric = GET_U_1(bp);
+			bp++;
 			done = metric & 0x80;
 			metric &= 0x7f;
-			printf("\n\t  %s metric %d", intoa(htonl(origin)),
+			ND_PRINT("\n\t  %s metric %u", intoa(htonl(origin)),
 				metric);
 			len -= width + 1;
 		} while (!done);
 	}
+	return (0);
+trunc:
+	return (-1);
 }
 
-#define GET_ADDR(to) (memcpy((char *)to, (char *)bp, 4), bp += 4)
-
-static void
-print_probe(register const u_char *bp, register const u_char *ep,
-    register u_int len)
+static int
+print_probe(netdissect_options *ndo,
+            const u_char *bp, const u_char *ep,
+            u_int len)
 {
-	register u_int32_t genid;
-	u_char neighbor[4];
+	uint32_t genid;
 
+	ND_TCHECK_4(bp);
 	if ((len < 4) || ((bp + 4) > ep)) {
 		/* { (ctags) */
-		printf(" [|}");
-		return;
+		ND_PRINT(" [|}");
+		return (0);
 	}
-	genid = (bp[0] << 24) | (bp[1] << 16) | (bp[2] << 8) | bp[3];
+	genid = GET_BE_U_4(bp);
 	bp += 4;
 	len -= 4;
-	printf("\n\tgenid %u", genid);
+	ND_PRINT(ndo->ndo_vflag > 1 ? "\n\t" : " ");
+	ND_PRINT("genid %u", genid);
+	if (ndo->ndo_vflag < 2)
+		return (0);
 
 	while ((len > 0) && (bp < ep)) {
-		if ((len < 4) || ((bp + 4) > ep)) {
-			printf(" [|]");
-			return;
-		}
-		GET_ADDR(neighbor);
-		len -= 4;
-		printf("\n\tneighbor %s", ipaddr_string(neighbor));
+		ND_TCHECK_4(bp);
+		ND_PRINT("\n\tneighbor %s", ipaddr_string(ndo, bp));
+		bp += 4; len -= 4;
 	}
+	return (0);
+trunc:
+	return (-1);
 }
 
-static void
-print_neighbors(register const u_char *bp, register const u_char *ep,
-    register u_int len)
+static int
+print_neighbors(netdissect_options *ndo,
+                const u_char *bp, const u_char *ep,
+                u_int len)
 {
-	u_char laddr[4], neighbor[4];
-	register u_char metric;
-	register u_char thresh;
-	register int ncount;
+	const u_char *laddr;
+	u_char metric;
+	u_char thresh;
+	int ncount;
 
 	while (len > 0 && bp < ep) {
-		if (len < 7 || (bp + 7) >= ep) {
-			printf(" [|]");
-			return;
-		}
-		GET_ADDR(laddr);
-		metric = *bp++;
-		thresh = *bp++;
-		ncount = *bp++;
+		ND_TCHECK_7(bp);
+		laddr = bp;
+		bp += 4;
+		metric = GET_U_1(bp);
+		bp++;
+		thresh = GET_U_1(bp);
+		bp++;
+		ncount = GET_U_1(bp);
+		bp++;
 		len -= 7;
-		while (--ncount >= 0 && (len >= 4) && (bp + 4) < ep) {
-			GET_ADDR(neighbor);
-			printf(" [%s ->", ipaddr_string(laddr));
-			printf(" %s, (%d/%d)]",
-				   ipaddr_string(neighbor), metric, thresh);
+		while (--ncount >= 0) {
+			ND_TCHECK_4(bp);
+			ND_PRINT(" [%s ->", ipaddr_string(ndo, laddr));
+			ND_PRINT(" %s, (%u/%u)]",
+				   ipaddr_string(ndo, bp), metric, thresh);
+			bp += 4;
 			len -= 4;
 		}
 	}
+	return (0);
+trunc:
+	return (-1);
 }
 
-static void
-print_neighbors2(register const u_char *bp, register const u_char *ep,
-    register u_int len)
+static int
+print_neighbors2(netdissect_options *ndo,
+                 const u_char *bp, const u_char *ep,
+                 u_int len, uint8_t major_version,
+                 uint8_t minor_version)
 {
-	u_char laddr[4], neighbor[4];
-	register u_char metric, thresh, flags;
-	register int ncount;
+	const u_char *laddr;
+	u_char metric, thresh, flags;
+	int ncount;
 
-	printf(" (v %d.%d):",
-	       (int)target_level & 0xff,
-	       (int)(target_level >> 8) & 0xff);
+	ND_PRINT(" (v %u.%u):", major_version, minor_version);
 
 	while (len > 0 && bp < ep) {
-		if (len < 8 || (bp + 8) >= ep) {
-			printf(" [|]");
-			return;
-		}
-		GET_ADDR(laddr);
-		metric = *bp++;
-		thresh = *bp++;
-		flags = *bp++;
-		ncount = *bp++;
+		ND_TCHECK_8(bp);
+		laddr = bp;
+		bp += 4;
+		metric = GET_U_1(bp);
+		bp++;
+		thresh = GET_U_1(bp);
+		bp++;
+		flags = GET_U_1(bp);
+		bp++;
+		ncount = GET_U_1(bp);
+		bp++;
 		len -= 8;
 		while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) {
-			GET_ADDR(neighbor);
-			printf(" [%s -> ", ipaddr_string(laddr));
-			printf("%s (%d/%d", ipaddr_string(neighbor),
+			ND_PRINT(" [%s -> ", ipaddr_string(ndo, laddr));
+			ND_PRINT("%s (%u/%u", ipaddr_string(ndo, bp),
 				     metric, thresh);
 			if (flags & DVMRP_NF_TUNNEL)
-				printf("/tunnel");
+				ND_PRINT("/tunnel");
 			if (flags & DVMRP_NF_SRCRT)
-				printf("/srcrt");
+				ND_PRINT("/srcrt");
 			if (flags & DVMRP_NF_QUERIER)
-				printf("/querier");
+				ND_PRINT("/querier");
 			if (flags & DVMRP_NF_DISABLED)
-				printf("/disabled");
+				ND_PRINT("/disabled");
 			if (flags & DVMRP_NF_DOWN)
-				printf("/down");
-			printf(")]");
+				ND_PRINT("/down");
+			ND_PRINT(")]");
+			bp += 4;
 			len -= 4;
 		}
 		if (ncount != -1) {
-			printf(" [|]");
-			return;
+			ND_PRINT(" [|]");
+			return (0);
 		}
 	}
+	return (0);
+trunc:
+	return (-1);
 }
 
-static void
-print_prune(register const u_char *bp, register const u_char *ep,
-    register u_int len)
+static int
+print_prune(netdissect_options *ndo,
+            const u_char *bp)
 {
-	union a {
-		u_char b[4];
-		u_int32_t i;
-	} prune_timer;
-
-	if (len < 12 || (bp + 12) > ep) {
-		printf(" [|]");
-		return;
-	}
-	printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
+	ND_TCHECK_LEN(bp, 12);
+	ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
 	bp += 8;
-	GET_ADDR(prune_timer.b);
-	printf(" timer %d", (int)ntohl(prune_timer.i));
+	ND_PRINT(" timer ");
+	unsigned_relts_print(ndo, GET_BE_U_4(bp));
+	return (0);
+trunc:
+	return (-1);
 }
 
-static void
-print_graft(register const u_char *bp, register const u_char *ep,
-    register u_int len)
+static int
+print_graft(netdissect_options *ndo,
+            const u_char *bp)
 {
-
-	if (len < 8 || (bp + 8) > ep) {
-		printf(" [|]");
-		return;
-	}
-	printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
+	ND_TCHECK_8(bp);
+	ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
+	return (0);
+trunc:
+	return (-1);
 }
 
-static void
-print_graft_ack(register const u_char *bp, register const u_char *ep,
-    register u_int len)
+static int
+print_graft_ack(netdissect_options *ndo,
+                const u_char *bp)
 {
-
-	if (len < 8 || (bp + 8) > ep) {
-		printf(" [|]");
-		return;
-	}
-	printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
+	ND_TCHECK_8(bp);
+	ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
+	return (0);
+trunc:
+	return (-1);
 }