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-rw-r--r--contrib/tcpdump/print-dvmrp.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-dvmrp.c b/contrib/tcpdump/print-dvmrp.c
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+++ b/contrib/tcpdump/print-dvmrp.c
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+/*
+ * Copyright (c) 1995, 1996
+ * The Regents of the University of California. All rights reserved.
+ *
+ * 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 in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-dvmrp.c,v 1.27 2003-11-19 09:42:04 guy Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "interface.h"
+#include "extract.h"
+#include "addrtoname.h"
+
+/*
+ * 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 */
+#define DVMRP_NEIGHBORS 4 /* response to such a request */
+#define DVMRP_ASK_NEIGHBORS2 5 /* as above, want new format reply */
+#define DVMRP_NEIGHBORS2 6
+#define DVMRP_PRUNE 7 /* prune message */
+#define DVMRP_GRAFT 8 /* graft message */
+#define DVMRP_GRAFT_ACK 9 /* graft acknowledgement */
+
+/*
+ * 'flags' byte values in DVMRP_NEIGHBORS2 reply.
+ */
+#define DVMRP_NF_TUNNEL 0x01 /* neighbors reached via tunnel */
+#define DVMRP_NF_SRCRT 0x02 /* tunnel uses IP source routing */
+#define DVMRP_NF_DOWN 0x10 /* kernel state of interface */
+#define DVMRP_NF_DISABLED 0x20 /* administratively disabled */
+#define DVMRP_NF_QUERIER 0x40 /* I am the subnet's querier */
+
+static int print_probe(const u_char *, const u_char *, u_int);
+static int print_report(const u_char *, const u_char *, u_int);
+static int print_neighbors(const u_char *, const u_char *, u_int);
+static int print_neighbors2(const u_char *, const u_char *, u_int);
+static int print_prune(const u_char *);
+static int print_graft(const u_char *);
+static int print_graft_ack(const u_char *);
+
+static u_int32_t target_level;
+
+void
+dvmrp_print(register const u_char *bp, register u_int len)
+{
+ register const u_char *ep;
+ register u_char type;
+
+ ep = (const u_char *)snapend;
+ if (bp >= ep)
+ return;
+
+ TCHECK(bp[1]);
+ type = bp[1];
+
+ /* Skip IGMP header */
+ bp += 8;
+ len -= 8;
+
+ switch (type) {
+
+ case DVMRP_PROBE:
+ printf(" Probe");
+ if (vflag) {
+ if (print_probe(bp, ep, len) < 0)
+ goto trunc;
+ }
+ break;
+
+ case DVMRP_REPORT:
+ printf(" Report");
+ if (vflag > 1) {
+ if (print_report(bp, ep, len) < 0)
+ goto trunc;
+ }
+ break;
+
+ case DVMRP_ASK_NEIGHBORS:
+ printf(" Ask-neighbors(old)");
+ break;
+
+ case DVMRP_NEIGHBORS:
+ printf(" Neighbors(old)");
+ if (print_neighbors(bp, ep, len) < 0)
+ goto trunc;
+ break;
+
+ case DVMRP_ASK_NEIGHBORS2:
+ printf(" Ask-neighbors2");
+ break;
+
+ case DVMRP_NEIGHBORS2:
+ printf(" Neighbors2");
+ /*
+ * extract version and capabilities from IGMP group
+ * address field
+ */
+ bp -= 4;
+ TCHECK2(bp[0], 4);
+ target_level = (bp[0] << 24) | (bp[1] << 16) |
+ (bp[2] << 8) | bp[3];
+ bp += 4;
+ if (print_neighbors2(bp, ep, len) < 0)
+ goto trunc;
+ break;
+
+ case DVMRP_PRUNE:
+ printf(" Prune");
+ if (print_prune(bp) < 0)
+ goto trunc;
+ break;
+
+ case DVMRP_GRAFT:
+ printf(" Graft");
+ if (print_graft(bp) < 0)
+ goto trunc;
+ break;
+
+ case DVMRP_GRAFT_ACK:
+ printf(" Graft-ACK");
+ if (print_graft_ack(bp) < 0)
+ goto trunc;
+ break;
+
+ default:
+ printf(" [type %d]", type);
+ break;
+ }
+ return;
+
+trunc:
+ printf("[|dvmrp]");
+ return;
+}
+
+static int
+print_report(register const u_char *bp, register const u_char *ep,
+ register u_int len)
+{
+ register u_int32_t mask, origin;
+ register int metric, done;
+ register u_int i, width;
+
+ while (len > 0) {
+ if (len < 3) {
+ printf(" [|]");
+ return (0);
+ }
+ TCHECK2(bp[0], 3);
+ mask = (u_int32_t)0xff << 24 | bp[0] << 16 | bp[1] << 8 | bp[2];
+ width = 1;
+ if (bp[0])
+ width = 2;
+ if (bp[1])
+ width = 3;
+ if (bp[2])
+ width = 4;
+
+ printf("\n\tMask %s", intoa(htonl(mask)));
+ bp += 3;
+ len -= 3;
+ do {
+ if (bp + width + 1 > ep) {
+ printf(" [|]");
+ return (0);
+ }
+ if (len < width + 1) {
+ printf("\n\t [Truncated Report]");
+ return (0);
+ }
+ origin = 0;
+ for (i = 0; i < width; ++i) {
+ TCHECK(*bp);
+ origin = origin << 8 | *bp++;
+ }
+ for ( ; i < 4; ++i)
+ origin <<= 8;
+
+ TCHECK(*bp);
+ metric = *bp++;
+ done = metric & 0x80;
+ metric &= 0x7f;
+ printf("\n\t %s metric %d", intoa(htonl(origin)),
+ metric);
+ len -= width + 1;
+ } while (!done);
+ }
+ return (0);
+trunc:
+ return (-1);
+}
+
+static int
+print_probe(register const u_char *bp, register const u_char *ep,
+ register u_int len)
+{
+ register u_int32_t genid;
+
+ TCHECK2(bp[0], 4);
+ if ((len < 4) || ((bp + 4) > ep)) {
+ /* { (ctags) */
+ printf(" [|}");
+ return (0);
+ }
+ genid = (bp[0] << 24) | (bp[1] << 16) | (bp[2] << 8) | bp[3];
+ bp += 4;
+ len -= 4;
+ if (vflag > 1)
+ printf("\n\t");
+ else
+ printf(" ");
+ printf("genid %u", genid);
+ if (vflag < 2)
+ return (0);
+
+ while ((len > 0) && (bp < ep)) {
+ TCHECK2(bp[0], 4);
+ printf("\n\tneighbor %s", ipaddr_string(bp));
+ bp += 4; len -= 4;
+ }
+ return (0);
+trunc:
+ return (-1);
+}
+
+static int
+print_neighbors(register const u_char *bp, register const u_char *ep,
+ register u_int len)
+{
+ const u_char *laddr;
+ register u_char metric;
+ register u_char thresh;
+ register int ncount;
+
+ while (len > 0 && bp < ep) {
+ TCHECK2(bp[0], 7);
+ laddr = bp;
+ bp += 4;
+ metric = *bp++;
+ thresh = *bp++;
+ ncount = *bp++;
+ len -= 7;
+ while (--ncount >= 0) {
+ TCHECK2(bp[0], 4);
+ printf(" [%s ->", ipaddr_string(laddr));
+ printf(" %s, (%d/%d)]",
+ ipaddr_string(bp), metric, thresh);
+ bp += 4;
+ len -= 4;
+ }
+ }
+ return (0);
+trunc:
+ return (-1);
+}
+
+static int
+print_neighbors2(register const u_char *bp, register const u_char *ep,
+ register u_int len)
+{
+ const u_char *laddr;
+ register u_char metric, thresh, flags;
+ register int ncount;
+
+ printf(" (v %d.%d):",
+ (int)target_level & 0xff,
+ (int)(target_level >> 8) & 0xff);
+
+ while (len > 0 && bp < ep) {
+ TCHECK2(bp[0], 8);
+ laddr = bp;
+ bp += 4;
+ metric = *bp++;
+ thresh = *bp++;
+ flags = *bp++;
+ ncount = *bp++;
+ len -= 8;
+ while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) {
+ printf(" [%s -> ", ipaddr_string(laddr));
+ printf("%s (%d/%d", ipaddr_string(bp),
+ metric, thresh);
+ if (flags & DVMRP_NF_TUNNEL)
+ printf("/tunnel");
+ if (flags & DVMRP_NF_SRCRT)
+ printf("/srcrt");
+ if (flags & DVMRP_NF_QUERIER)
+ printf("/querier");
+ if (flags & DVMRP_NF_DISABLED)
+ printf("/disabled");
+ if (flags & DVMRP_NF_DOWN)
+ printf("/down");
+ printf(")]");
+ bp += 4;
+ len -= 4;
+ }
+ if (ncount != -1) {
+ printf(" [|]");
+ return (0);
+ }
+ }
+ return (0);
+trunc:
+ return (-1);
+}
+
+static int
+print_prune(register const u_char *bp)
+{
+ TCHECK2(bp[0], 12);
+ printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
+ bp += 8;
+ (void)printf(" timer ");
+ relts_print(EXTRACT_32BITS(bp));
+ return (0);
+trunc:
+ return (-1);
+}
+
+static int
+print_graft(register const u_char *bp)
+{
+ TCHECK2(bp[0], 8);
+ printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
+ return (0);
+trunc:
+ return (-1);
+}
+
+static int
+print_graft_ack(register const u_char *bp)
+{
+ TCHECK2(bp[0], 8);
+ printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
+ return (0);
+trunc:
+ return (-1);
+}
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