mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-27 12:03:44 +08:00
379 lines
8.8 KiB
C
379 lines
8.8 KiB
C
/*
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* Copyright (c) 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: Distance Vector Multicast Routing Protocol printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include "netdissect.h"
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#include "extract.h"
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#include "addrtoname.h"
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/*
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* See: RFC 1075 and draft-ietf-idmr-dvmrp-v3
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*
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* DVMRP message types and flag values shamelessly stolen from
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* mrouted/dvmrp.h.
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*/
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#define DVMRP_PROBE 1 /* for finding neighbors */
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#define DVMRP_REPORT 2 /* for reporting some or all routes */
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#define DVMRP_ASK_NEIGHBORS 3 /* sent by mapper, asking for a list */
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/* of this router's neighbors */
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#define DVMRP_NEIGHBORS 4 /* response to such a request */
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#define DVMRP_ASK_NEIGHBORS2 5 /* as above, want new format reply */
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#define DVMRP_NEIGHBORS2 6
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#define DVMRP_PRUNE 7 /* prune message */
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#define DVMRP_GRAFT 8 /* graft message */
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#define DVMRP_GRAFT_ACK 9 /* graft acknowledgement */
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/*
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* 'flags' byte values in DVMRP_NEIGHBORS2 reply.
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*/
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#define DVMRP_NF_TUNNEL 0x01 /* neighbors reached via tunnel */
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#define DVMRP_NF_SRCRT 0x02 /* tunnel uses IP source routing */
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#define DVMRP_NF_DOWN 0x10 /* kernel state of interface */
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#define DVMRP_NF_DISABLED 0x20 /* administratively disabled */
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#define DVMRP_NF_QUERIER 0x40 /* I am the subnet's querier */
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static int print_probe(netdissect_options *, const u_char *, const u_char *, u_int);
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static int print_report(netdissect_options *, const u_char *, const u_char *, u_int);
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static int print_neighbors(netdissect_options *, const u_char *, const u_char *, u_int);
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static int print_neighbors2(netdissect_options *, const u_char *, const u_char *, u_int, uint8_t, uint8_t);
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static int print_prune(netdissect_options *, const u_char *);
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static int print_graft(netdissect_options *, const u_char *);
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static int print_graft_ack(netdissect_options *, const u_char *);
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void
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dvmrp_print(netdissect_options *ndo,
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const u_char *bp, u_int len)
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{
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const u_char *ep;
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u_char type;
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uint8_t major_version, minor_version;
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ep = (const u_char *)ndo->ndo_snapend;
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if (bp >= ep)
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return;
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ND_TCHECK_1(bp + 1);
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type = EXTRACT_U_1(bp + 1);
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/* Skip IGMP header */
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bp += 8;
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len -= 8;
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switch (type) {
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case DVMRP_PROBE:
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ND_PRINT(" Probe");
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if (ndo->ndo_vflag) {
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if (print_probe(ndo, bp, ep, len) < 0)
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goto trunc;
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}
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break;
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case DVMRP_REPORT:
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ND_PRINT(" Report");
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if (ndo->ndo_vflag > 1) {
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if (print_report(ndo, bp, ep, len) < 0)
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goto trunc;
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}
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break;
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case DVMRP_ASK_NEIGHBORS:
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ND_PRINT(" Ask-neighbors(old)");
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break;
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case DVMRP_NEIGHBORS:
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ND_PRINT(" Neighbors(old)");
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if (print_neighbors(ndo, bp, ep, len) < 0)
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goto trunc;
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break;
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case DVMRP_ASK_NEIGHBORS2:
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ND_PRINT(" Ask-neighbors2");
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break;
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case DVMRP_NEIGHBORS2:
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ND_PRINT(" Neighbors2");
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/*
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* extract version from IGMP group address field
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*/
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bp -= 4;
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ND_TCHECK_4(bp);
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major_version = EXTRACT_U_1(bp + 3);
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minor_version = EXTRACT_U_1(bp + 2);
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bp += 4;
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if (print_neighbors2(ndo, bp, ep, len, major_version,
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minor_version) < 0)
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goto trunc;
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break;
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case DVMRP_PRUNE:
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ND_PRINT(" Prune");
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if (print_prune(ndo, bp) < 0)
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goto trunc;
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break;
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case DVMRP_GRAFT:
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ND_PRINT(" Graft");
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if (print_graft(ndo, bp) < 0)
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goto trunc;
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break;
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case DVMRP_GRAFT_ACK:
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ND_PRINT(" Graft-ACK");
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if (print_graft_ack(ndo, bp) < 0)
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goto trunc;
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break;
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default:
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ND_PRINT(" [type %d]", type);
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break;
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}
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return;
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trunc:
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ND_PRINT("[|dvmrp]");
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return;
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}
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static int
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print_report(netdissect_options *ndo,
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const u_char *bp, const u_char *ep,
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u_int len)
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{
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uint32_t mask, origin;
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int metric, done;
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u_int i, width;
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while (len > 0) {
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if (len < 3) {
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ND_PRINT(" [|]");
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return (0);
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}
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ND_TCHECK_3(bp);
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mask = (uint32_t)0xff << 24 | EXTRACT_U_1(bp) << 16 |
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EXTRACT_U_1(bp + 1) << 8 | EXTRACT_U_1(bp + 2);
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width = 1;
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if (EXTRACT_U_1(bp))
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width = 2;
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if (EXTRACT_U_1(bp + 1))
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width = 3;
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if (EXTRACT_U_1(bp + 2))
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width = 4;
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ND_PRINT("\n\tMask %s", intoa(htonl(mask)));
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bp += 3;
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len -= 3;
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do {
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if (bp + width + 1 > ep) {
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ND_PRINT(" [|]");
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return (0);
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}
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if (len < width + 1) {
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ND_PRINT("\n\t [Truncated Report]");
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return (0);
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}
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origin = 0;
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for (i = 0; i < width; ++i) {
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ND_TCHECK_1(bp);
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origin = origin << 8 | EXTRACT_U_1(bp);
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bp++;
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}
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for ( ; i < 4; ++i)
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origin <<= 8;
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ND_TCHECK_1(bp);
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metric = EXTRACT_U_1(bp);
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bp++;
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done = metric & 0x80;
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metric &= 0x7f;
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ND_PRINT("\n\t %s metric %d", intoa(htonl(origin)),
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metric);
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len -= width + 1;
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} while (!done);
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}
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return (0);
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trunc:
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return (-1);
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}
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static int
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print_probe(netdissect_options *ndo,
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const u_char *bp, const u_char *ep,
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u_int len)
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{
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uint32_t genid;
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ND_TCHECK_4(bp);
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if ((len < 4) || ((bp + 4) > ep)) {
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/* { (ctags) */
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ND_PRINT(" [|}");
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return (0);
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}
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genid = (EXTRACT_U_1(bp) << 24) | (EXTRACT_U_1(bp + 1) << 16) |
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(EXTRACT_U_1(bp + 2) << 8) | EXTRACT_U_1(bp + 3);
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bp += 4;
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len -= 4;
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ND_PRINT(ndo->ndo_vflag > 1 ? "\n\t" : " ");
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ND_PRINT("genid %u", genid);
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if (ndo->ndo_vflag < 2)
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return (0);
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while ((len > 0) && (bp < ep)) {
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ND_TCHECK_4(bp);
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ND_PRINT("\n\tneighbor %s", ipaddr_string(ndo, bp));
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bp += 4; len -= 4;
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}
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return (0);
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trunc:
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return (-1);
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}
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static int
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print_neighbors(netdissect_options *ndo,
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const u_char *bp, const u_char *ep,
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u_int len)
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{
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const u_char *laddr;
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u_char metric;
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u_char thresh;
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int ncount;
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while (len > 0 && bp < ep) {
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ND_TCHECK_7(bp);
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laddr = bp;
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bp += 4;
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metric = EXTRACT_U_1(bp);
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bp++;
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thresh = EXTRACT_U_1(bp);
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bp++;
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ncount = EXTRACT_U_1(bp);
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bp++;
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len -= 7;
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while (--ncount >= 0) {
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ND_TCHECK_4(bp);
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ND_PRINT(" [%s ->", ipaddr_string(ndo, laddr));
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ND_PRINT(" %s, (%d/%d)]",
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ipaddr_string(ndo, bp), metric, thresh);
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bp += 4;
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len -= 4;
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}
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}
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return (0);
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trunc:
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return (-1);
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}
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static int
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print_neighbors2(netdissect_options *ndo,
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const u_char *bp, const u_char *ep,
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u_int len, uint8_t major_version,
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uint8_t minor_version)
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{
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const u_char *laddr;
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u_char metric, thresh, flags;
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int ncount;
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ND_PRINT(" (v %u.%u):", major_version, minor_version);
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while (len > 0 && bp < ep) {
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ND_TCHECK_8(bp);
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laddr = bp;
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bp += 4;
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metric = EXTRACT_U_1(bp);
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bp++;
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thresh = EXTRACT_U_1(bp);
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bp++;
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flags = EXTRACT_U_1(bp);
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bp++;
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ncount = EXTRACT_U_1(bp);
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bp++;
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len -= 8;
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while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) {
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ND_PRINT(" [%s -> ", ipaddr_string(ndo, laddr));
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ND_PRINT("%s (%d/%d", ipaddr_string(ndo, bp),
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metric, thresh);
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if (flags & DVMRP_NF_TUNNEL)
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ND_PRINT("/tunnel");
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if (flags & DVMRP_NF_SRCRT)
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ND_PRINT("/srcrt");
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if (flags & DVMRP_NF_QUERIER)
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ND_PRINT("/querier");
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if (flags & DVMRP_NF_DISABLED)
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ND_PRINT("/disabled");
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if (flags & DVMRP_NF_DOWN)
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ND_PRINT("/down");
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ND_PRINT(")]");
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bp += 4;
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len -= 4;
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}
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if (ncount != -1) {
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ND_PRINT(" [|]");
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return (0);
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}
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}
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return (0);
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trunc:
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return (-1);
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}
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static int
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print_prune(netdissect_options *ndo,
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const u_char *bp)
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{
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ND_TCHECK_LEN(bp, 12);
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ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
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bp += 8;
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ND_PRINT(" timer ");
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unsigned_relts_print(ndo, EXTRACT_BE_U_4(bp));
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return (0);
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trunc:
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return (-1);
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}
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static int
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print_graft(netdissect_options *ndo,
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const u_char *bp)
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{
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ND_TCHECK_8(bp);
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ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
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return (0);
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trunc:
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return (-1);
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}
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static int
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print_graft_ack(netdissect_options *ndo,
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const u_char *bp)
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{
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ND_TCHECK_8(bp);
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ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
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return (0);
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trunc:
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return (-1);
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}
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