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NetBSD/usr.sbin/tcpdump/print-pim.c
itojun 6baefd92e4 sync with recent KAME. 
- more length overflow check for ip6 related parsing
- protocol decode fixes
- add dhcp6 parser

XXX how should we maintain usr.sbin/tcpdump for years to come?
relationship with www.tcpdump.org codebase?
1999-12-10 05:45:07 +00:00

593 lines
12 KiB
C
Raw Blame History

/* $NetBSD: print-pim.c,v 1.4 1999/12/10 05:45:08 itojun Exp $ */
/*
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static const char rcsid[] =
"@(#) KAME Header: /cvsroot/kame/kame/kame/kame/tcpdump/print-pim.c,v 1.4 1999/11/17 14:49:49 jinmei Exp";
#else
__RCSID("$NetBSD: print-pim.c,v 1.4 1999/12/10 05:45:08 itojun Exp $");
#endif
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#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>
/*
* XXX: We consider a case where IPv6 is not ready yet for portability,
* but PIM dependent defintions should be independent of IPv6...
*/
#ifdef INET6
#include <netinet6/pim6.h>
#else
struct pim {
#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
u_char pim_type:4, /* the PIM message type, currently they are:
* Hello, Register, Register-Stop, Join/Prune,
* Bootstrap, Assert, Graft (PIM-DM only),
* Graft-Ack (PIM-DM only), C-RP-Adv
*/
pim_ver:4; /* PIM version number; 2 for PIMv2 */
#else
u_char pim_ver:4, /* PIM version */
pim_type:4; /* PIM type */
#endif
u_char pim_rsv; /* Reserved */
u_short pim_cksum; /* IP style check sum */
};
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "interface.h"
#include "addrtoname.h"
static void pimv2_print(register const u_char *bp, register u_int len);
void
igmp_pim_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;
type = bp[1];
switch (type) {
case 0:
(void)printf(" Query");
break;
case 1:
(void)printf(" Register");
break;
case 2:
(void)printf(" Register-Stop");
break;
case 3:
(void)printf(" Join/Prune");
break;
case 4:
(void)printf(" RP-reachable");
break;
case 5:
(void)printf(" Assert");
break;
case 6:
(void)printf(" Graft");
break;
case 7:
(void)printf(" Graft-ACK");
break;
case 8:
(void)printf(" Mode");
break;
default:
(void)printf(" [type %d]", type);
break;
}
}
void
pim_print(register const u_char *bp, register u_int len)
{
register const u_char *ep;
register struct pim *pim = (struct pim *)bp;
ep = (const u_char *)snapend;
if (bp >= ep)
return;
#ifdef notyet /* currently we see only version and type */
TCHECK(pim->pim_rsv);
#endif
switch(pim->pim_ver) {
case 2: /* avoid hardcoding? */
(void)printf("PIMv2");
pimv2_print(bp, len);
break;
default:
(void)printf("PIMv%d", pim->pim_ver);
break;
}
return;
}
enum pimv2_addrtype {
pimv2_unicast, pimv2_group, pimv2_source
};
#if 0
static char *addrtypestr[] = {
"unicast", "group", "source"
};
#endif
static int
pimv2_addr_print(const u_char *bp, enum pimv2_addrtype at, int silent)
{
const u_char *ep;
int af;
char *afstr;
int len;
ep = (const u_char *)snapend;
if (bp >= ep)
return -1;
switch (bp[0]) {
case 1:
af = AF_INET;
afstr = "IPv4";
break;
#ifdef INET6
case 2:
af = AF_INET6;
afstr = "IPv6";
break;
#endif
default:
return -1;
}
if (bp[1] != 0)
return -1;
switch (at) {
case pimv2_unicast:
if (af == AF_INET) {
len = 4;
if (bp + 2 + len > ep)
return -1;
if (!silent)
(void)printf("%s", ipaddr_string(bp + 2));
}
#ifdef INET6
else if (af == AF_INET6) {
len = 16;
if (bp + 2 + len > ep)
return -1;
if (!silent)
(void)printf("%s", ip6addr_string(bp + 2));
}
#endif
return 2 + len;
case pimv2_group:
if (af == AF_INET) {
len = 4;
if (bp + 4 + len > ep)
return -1;
if (!silent)
(void)printf("%s/%u", ipaddr_string(bp + 4), bp[3]);
}
#ifdef INET6
else if (af == AF_INET6) {
len = 16;
if (bp + 4 + len > ep)
return -1;
if (!silent)
(void)printf("%s/%u", ip6addr_string(bp + 4), bp[3]);
}
#endif
return 4 + len;
case pimv2_source:
if (af == AF_INET) {
len = 4;
if (bp + 4 + len > ep)
return -1;
if (!silent)
(void)printf("%s/%u", ipaddr_string(bp + 4), bp[3]);
}
#ifdef INET6
else if (af == AF_INET6) {
len = 16;
if (bp + 4 + len > ep)
return -1;
if (!silent)
(void)printf("%s/%u", ip6addr_string(bp + 4), bp[3]);
}
#endif
if (vflag && bp[2] && !silent) {
(void)printf("(%s%s%s)",
bp[2] & 0x04 ? "S" : "",
bp[2] & 0x02 ? "W" : "",
bp[2] & 0x01 ? "R" : "");
}
return 4 + len;
default:
return -1;
}
}
static void
pimv2_print(register const u_char *bp, register u_int len)
{
register const u_char *ep;
register struct pim *pim = (struct pim *)bp;
int advance;
ep = (const u_char *)snapend;
if (bp >= ep)
return;
#ifdef notyet /* currently we see only version and type */
TCHECK(pim->pim_rsv);
#endif
switch (pim->pim_type) {
case 0:
{
u_int16_t otype, olen;
(void)printf(" Hello");
bp += 4;
while (bp < ep) {
otype = ntohs(*(u_int16_t *)(bp + 0));
olen = ntohs(*(u_int16_t *)(bp + 2));
if (otype == 1 && olen == 2 && bp + 4 + olen <= ep) {
u_int16_t value;
(void)printf(" holdtime=");
value = ntohs(*(u_int16_t *)(bp + 4));
if (value == 0xffff)
(void)printf("infty");
else
(void)printf("%u", value);
bp += 4 + olen;
} else
break;
}
break;
}
case 1:
{
struct ip *ip;
(void)printf(" Register");
if (vflag && bp + 8 <= ep) {
(void)printf(" %s%s", bp[4] & 0x80 ? "B" : "",
bp[4] & 0x40 ? "N" : "");
}
bp += 8; len -= 8;
/* encapsulated multicast packet */
if (bp >= ep)
break;
ip = (struct ip *)bp;
switch(ip->ip_v) {
case 4: /* IPv4 */
printf(" ");
ip_print(bp, len);
break;
#ifdef INET6
case 6: /* IPv6 */
printf(" ");
ip6_print(bp, len);
break;
#endif
default:
(void)printf(" IP ver %d", ip->ip_v);
break;
}
break;
}
case 2:
(void)printf(" Register-Stop");
bp += 4; len -= 4;
if (bp >= ep)
break;
(void)printf(" group=");
if ((advance = pimv2_addr_print(bp, pimv2_group, 0)) < 0) {
(void)printf("...");
break;
}
bp += advance; len -= advance;
if (bp >= ep)
break;
(void)printf(" source=");
if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
(void)printf("...");
break;
}
bp += advance; len -= advance;
break;
case 3:
case 6:
case 7:
{
u_int8_t ngroup;
u_int16_t holdtime;
u_int16_t njoin;
u_int16_t nprune;
int i, j;
switch (pim->pim_type) {
case 3:
(void)printf(" Join/Prune");
break;
case 6:
(void)printf(" Graft");
break;
case 7:
(void)printf(" Graft-ACK");
break;
}
bp += 4; len -= 4;
if (pim->pim_type != 7) { /*not for Graft-ACK*/
if (bp >= ep)
break;
(void)printf(" upstream-neighbor=");
if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
(void)printf("...");
break;
}
bp += advance; len -= advance;
}
if (bp + 4 > ep)
break;
ngroup = bp[1];
holdtime = ntohs(*(u_int16_t *)(bp + 2));
(void)printf(" groups=%u", ngroup);
if (pim->pim_type != 7) { /*not for Graft-ACK*/
(void)printf(" holdtime=");
if (holdtime == 0xffff)
(void)printf("infty");
else
(void)printf("%u", holdtime);
}
bp += 4; len -= 4;
for (i = 0; i < ngroup; i++) {
if (bp >= ep)
goto jp_done;
(void)printf(" (group%d: ", i);
if ((advance = pimv2_addr_print(bp, pimv2_group, 0)) < 0) {
(void)printf("...)");
goto jp_done;
}
bp += advance; len -= advance;
if (bp + 4 > ep) {
(void)printf("...)");
goto jp_done;
}
njoin = ntohs(*(u_int16_t *)(bp + 0));
nprune = ntohs(*(u_int16_t *)(bp + 2));
(void)printf(" join=%u", njoin);
bp += 4; len -= 4;
for (j = 0; j < njoin; j++) {
(void)printf(" ");
if ((advance = pimv2_addr_print(bp, pimv2_source, 0)) < 0) {
(void)printf("...)");
goto jp_done;
}
bp += advance; len -= advance;
}
(void)printf(" prune=%u", nprune);
for (j = 0; j < nprune; j++) {
(void)printf(" ");
if ((advance = pimv2_addr_print(bp, pimv2_source, 0)) < 0) {
(void)printf("...)");
goto jp_done;
}
bp += advance; len -= advance;
}
(void)printf(")");
}
jp_done:
break;
}
case 4:
{
int i, j, frpcnt;
(void)printf(" Bootstrap");
bp += 4;
/* Fragment Tag, Hash Mask len, and BSR-priority */
if (bp + sizeof(u_int16_t) >= ep) break;
(void)printf(" tag=%x", ntohs(*(u_int16_t *)bp));
bp += sizeof(u_int16_t);
if (bp >= ep) break;
(void)printf(" hashmlen=%d", bp[0]);
if (bp + 1 >= ep) break;
(void)printf(" BSRprio=%d", bp[1]);
bp += 2;
/* Encoded-Unicast-BSR-Address */
if (bp >= ep) break;
(void)printf(" BSR=");
if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
(void)printf("...");
break;
}
bp += advance;
for (i = 0; bp < ep; i++) {
/* Encoded-Group Address */
(void)printf(" (group%d: ", i);
if ((advance = pimv2_addr_print(bp, pimv2_group, 0))
< 0) {
(void)printf("...)");
goto bs_done;
}
bp += advance;
/* RP-Count, Frag RP-Cnt, and rsvd */
if (bp >= ep) {
(void)printf("...)");
goto bs_done;
}
(void)printf(" RPcnt=%d", frpcnt = bp[0]);
if (bp + 1 >= ep) {
(void)printf("...)");
goto bs_done;
}
(void)printf(" FRPcnt=%d", bp[1]);
bp += 4;
for (j = 0; j < frpcnt && bp < ep; j++) {
/* each RP info */
(void)printf(" RP%d=", j);
if ((advance = pimv2_addr_print(bp,
pimv2_unicast,
0)) < 0) {
(void)printf("...)");
goto bs_done;
}
bp += advance;
if (bp + 1 >= ep) {
(void)printf("...)");
goto bs_done;
}
(void)printf(",holdtime=%d",
ntohs(*(u_int16_t *)bp));
if (bp + 2 >= ep) {
(void)printf("...)");
goto bs_done;
}
(void)printf(",prio=%d", bp[2]);
bp += 4;
}
(void)printf(")");
}
bs_done:
break;
}
case 5:
(void)printf(" Assert");
bp += 4; len -= 4;
if (bp >= ep)
break;
(void)printf(" group=");
if ((advance = pimv2_addr_print(bp, pimv2_group, 0)) < 0) {
(void)printf("...");
break;
}
bp += advance; len -= advance;
if (bp >= ep)
break;
(void)printf(" src=");
if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
(void)printf("...");
break;
}
bp += advance; len -= advance;
if (bp + 8 > ep)
break;
if (ntohl(*(u_int32_t *)bp) & 0x80000000)
(void)printf(" RPT");
(void)printf(" pref=%u", ntohl(*(u_int32_t *)bp & 0x7fffffff));
(void)printf(" metric=%u", ntohl(*(u_int32_t *)(bp + 4)));
break;
case 8:
{
int i, pfxcnt;
(void)printf(" Candidate-RP-Advertisement");
bp += 4;
/* Prefix-Cnt, Priority, and Holdtime */
if (bp >= ep) break;
(void)printf(" prefix-cnt=%d", bp[0]);
pfxcnt = bp[0];
if (bp + 1 >= ep) break;
(void)printf(" prio=%d", bp[1]);
if (bp + 3 >= ep) break;
(void)printf(" holdtime=%d", ntohs(*(u_int16_t *)(bp + 2)));
bp += 4;
/* Encoded-Unicast-RP-Address */
if (bp >= ep) break;
(void)printf(" RP=");
if ((advance = pimv2_addr_print(bp, pimv2_unicast, 0)) < 0) {
(void)printf("...");
break;
}
bp += advance;
/* Encoded-Group Addresses */
for (i = 0; i < pfxcnt && bp < ep; i++) {
(void)printf(" Group%d=", i);
if ((advance = pimv2_addr_print(bp, pimv2_group, 0))
< 0) {
(void)printf("...");
break;
}
bp += advance;
}
break;
}
default:
(void)printf(" [type %d]", pim->pim_type);
break;
}
return;
}
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