create project
This commit is contained in:
lijia
365
print-dvmrp.c
Normal file
365
print-dvmrp.c
Normal file
@@ -0,0 +1,365 @@
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include "config.h"
|
||||
#endif
|
||||
|
||||
#include <netdissect-stdinc.h>
|
||||
|
||||
#include "netdissect.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(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);
|
||||
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 *);
|
||||
|
||||
static uint32_t target_level;
|
||||
|
||||
void
|
||||
dvmrp_print(netdissect_options *ndo,
|
||||
register const u_char *bp, register u_int len)
|
||||
{
|
||||
register const u_char *ep;
|
||||
register u_char type;
|
||||
|
||||
ep = (const u_char *)ndo->ndo_snapend;
|
||||
if (bp >= ep)
|
||||
return;
|
||||
|
||||
ND_TCHECK(bp[1]);
|
||||
type = bp[1];
|
||||
|
||||
/* Skip IGMP header */
|
||||
bp += 8;
|
||||
len -= 8;
|
||||
|
||||
switch (type) {
|
||||
|
||||
case DVMRP_PROBE:
|
||||
ND_PRINT((ndo, " Probe"));
|
||||
if (ndo->ndo_vflag) {
|
||||
if (print_probe(ndo, bp, ep, len) < 0)
|
||||
goto trunc;
|
||||
}
|
||||
break;
|
||||
|
||||
case DVMRP_REPORT:
|
||||
ND_PRINT((ndo, " Report"));
|
||||
if (ndo->ndo_vflag > 1) {
|
||||
if (print_report(ndo, bp, ep, len) < 0)
|
||||
goto trunc;
|
||||
}
|
||||
break;
|
||||
|
||||
case DVMRP_ASK_NEIGHBORS:
|
||||
ND_PRINT((ndo, " Ask-neighbors(old)"));
|
||||
break;
|
||||
|
||||
case DVMRP_NEIGHBORS:
|
||||
ND_PRINT((ndo, " Neighbors(old)"));
|
||||
if (print_neighbors(ndo, bp, ep, len) < 0)
|
||||
goto trunc;
|
||||
break;
|
||||
|
||||
case DVMRP_ASK_NEIGHBORS2:
|
||||
ND_PRINT((ndo, " Ask-neighbors2"));
|
||||
break;
|
||||
|
||||
case DVMRP_NEIGHBORS2:
|
||||
ND_PRINT((ndo, " Neighbors2"));
|
||||
/*
|
||||
* extract version and capabilities from IGMP group
|
||||
* address field
|
||||
*/
|
||||
bp -= 4;
|
||||
ND_TCHECK2(bp[0], 4);
|
||||
target_level = (bp[0] << 24) | (bp[1] << 16) |
|
||||
(bp[2] << 8) | bp[3];
|
||||
bp += 4;
|
||||
if (print_neighbors2(ndo, bp, ep, len) < 0)
|
||||
goto trunc;
|
||||
break;
|
||||
|
||||
case DVMRP_PRUNE:
|
||||
ND_PRINT((ndo, " Prune"));
|
||||
if (print_prune(ndo, bp) < 0)
|
||||
goto trunc;
|
||||
break;
|
||||
|
||||
case DVMRP_GRAFT:
|
||||
ND_PRINT((ndo, " Graft"));
|
||||
if (print_graft(ndo, bp) < 0)
|
||||
goto trunc;
|
||||
break;
|
||||
|
||||
case DVMRP_GRAFT_ACK:
|
||||
ND_PRINT((ndo, " Graft-ACK"));
|
||||
if (print_graft_ack(ndo, bp) < 0)
|
||||
goto trunc;
|
||||
break;
|
||||
|
||||
default:
|
||||
ND_PRINT((ndo, " [type %d]", type));
|
||||
break;
|
||||
}
|
||||
return;
|
||||
|
||||
trunc:
|
||||
ND_PRINT((ndo, "[|dvmrp]"));
|
||||
return;
|
||||
}
|
||||
|
||||
static int
|
||||
print_report(netdissect_options *ndo,
|
||||
register const u_char *bp, register const u_char *ep,
|
||||
register u_int len)
|
||||
{
|
||||
register uint32_t mask, origin;
|
||||
register int metric, done;
|
||||
register u_int i, width;
|
||||
|
||||
while (len > 0) {
|
||||
if (len < 3) {
|
||||
ND_PRINT((ndo, " [|]"));
|
||||
return (0);
|
||||
}
|
||||
ND_TCHECK2(bp[0], 3);
|
||||
mask = (uint32_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;
|
||||
|
||||
ND_PRINT((ndo, "\n\tMask %s", intoa(htonl(mask))));
|
||||
bp += 3;
|
||||
len -= 3;
|
||||
do {
|
||||
if (bp + width + 1 > ep) {
|
||||
ND_PRINT((ndo, " [|]"));
|
||||
return (0);
|
||||
}
|
||||
if (len < width + 1) {
|
||||
ND_PRINT((ndo, "\n\t [Truncated Report]"));
|
||||
return (0);
|
||||
}
|
||||
origin = 0;
|
||||
for (i = 0; i < width; ++i) {
|
||||
ND_TCHECK(*bp);
|
||||
origin = origin << 8 | *bp++;
|
||||
}
|
||||
for ( ; i < 4; ++i)
|
||||
origin <<= 8;
|
||||
|
||||
ND_TCHECK(*bp);
|
||||
metric = *bp++;
|
||||
done = metric & 0x80;
|
||||
metric &= 0x7f;
|
||||
ND_PRINT((ndo, "\n\t %s metric %d", intoa(htonl(origin)),
|
||||
metric));
|
||||
len -= width + 1;
|
||||
} while (!done);
|
||||
}
|
||||
return (0);
|
||||
trunc:
|
||||
return (-1);
|
||||
}
|
||||
|
||||
static int
|
||||
print_probe(netdissect_options *ndo,
|
||||
register const u_char *bp, register const u_char *ep,
|
||||
register u_int len)
|
||||
{
|
||||
register uint32_t genid;
|
||||
|
||||
ND_TCHECK2(bp[0], 4);
|
||||
if ((len < 4) || ((bp + 4) > ep)) {
|
||||
/* { (ctags) */
|
||||
ND_PRINT((ndo, " [|}"));
|
||||
return (0);
|
||||
}
|
||||
genid = (bp[0] << 24) | (bp[1] << 16) | (bp[2] << 8) | bp[3];
|
||||
bp += 4;
|
||||
len -= 4;
|
||||
ND_PRINT((ndo, ndo->ndo_vflag > 1 ? "\n\t" : " "));
|
||||
ND_PRINT((ndo, "genid %u", genid));
|
||||
if (ndo->ndo_vflag < 2)
|
||||
return (0);
|
||||
|
||||
while ((len > 0) && (bp < ep)) {
|
||||
ND_TCHECK2(bp[0], 4);
|
||||
ND_PRINT((ndo, "\n\tneighbor %s", ipaddr_string(ndo, bp)));
|
||||
bp += 4; len -= 4;
|
||||
}
|
||||
return (0);
|
||||
trunc:
|
||||
return (-1);
|
||||
}
|
||||
|
||||
static int
|
||||
print_neighbors(netdissect_options *ndo,
|
||||
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) {
|
||||
ND_TCHECK2(bp[0], 7);
|
||||
laddr = bp;
|
||||
bp += 4;
|
||||
metric = *bp++;
|
||||
thresh = *bp++;
|
||||
ncount = *bp++;
|
||||
len -= 7;
|
||||
while (--ncount >= 0) {
|
||||
ND_TCHECK2(bp[0], 4);
|
||||
ND_PRINT((ndo, " [%s ->", ipaddr_string(ndo, laddr)));
|
||||
ND_PRINT((ndo, " %s, (%d/%d)]",
|
||||
ipaddr_string(ndo, bp), metric, thresh));
|
||||
bp += 4;
|
||||
len -= 4;
|
||||
}
|
||||
}
|
||||
return (0);
|
||||
trunc:
|
||||
return (-1);
|
||||
}
|
||||
|
||||
static int
|
||||
print_neighbors2(netdissect_options *ndo,
|
||||
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;
|
||||
|
||||
ND_PRINT((ndo, " (v %d.%d):",
|
||||
(int)target_level & 0xff,
|
||||
(int)(target_level >> 8) & 0xff));
|
||||
|
||||
while (len > 0 && bp < ep) {
|
||||
ND_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) {
|
||||
ND_PRINT((ndo, " [%s -> ", ipaddr_string(ndo, laddr)));
|
||||
ND_PRINT((ndo, "%s (%d/%d", ipaddr_string(ndo, bp),
|
||||
metric, thresh));
|
||||
if (flags & DVMRP_NF_TUNNEL)
|
||||
ND_PRINT((ndo, "/tunnel"));
|
||||
if (flags & DVMRP_NF_SRCRT)
|
||||
ND_PRINT((ndo, "/srcrt"));
|
||||
if (flags & DVMRP_NF_QUERIER)
|
||||
ND_PRINT((ndo, "/querier"));
|
||||
if (flags & DVMRP_NF_DISABLED)
|
||||
ND_PRINT((ndo, "/disabled"));
|
||||
if (flags & DVMRP_NF_DOWN)
|
||||
ND_PRINT((ndo, "/down"));
|
||||
ND_PRINT((ndo, ")]"));
|
||||
bp += 4;
|
||||
len -= 4;
|
||||
}
|
||||
if (ncount != -1) {
|
||||
ND_PRINT((ndo, " [|]"));
|
||||
return (0);
|
||||
}
|
||||
}
|
||||
return (0);
|
||||
trunc:
|
||||
return (-1);
|
||||
}
|
||||
|
||||
static int
|
||||
print_prune(netdissect_options *ndo,
|
||||
register const u_char *bp)
|
||||
{
|
||||
ND_TCHECK2(bp[0], 12);
|
||||
ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));
|
||||
bp += 8;
|
||||
ND_PRINT((ndo, " timer "));
|
||||
relts_print(ndo, EXTRACT_32BITS(bp));
|
||||
return (0);
|
||||
trunc:
|
||||
return (-1);
|
||||
}
|
||||
|
||||
static int
|
||||
print_graft(netdissect_options *ndo,
|
||||
register const u_char *bp)
|
||||
{
|
||||
ND_TCHECK2(bp[0], 8);
|
||||
ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));
|
||||
return (0);
|
||||
trunc:
|
||||
return (-1);
|
||||
}
|
||||
|
||||
static int
|
||||
print_graft_ack(netdissect_options *ndo,
|
||||
register const u_char *bp)
|
||||
{
|
||||
ND_TCHECK2(bp[0], 8);
|
||||
ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));
|
||||
return (0);
|
||||
trunc:
|
||||
return (-1);
|
||||
}
|
||||
Reference in New Issue
Block a user