585 lines
12 KiB
C
585 lines
12 KiB
C
/* $NetBSD: print-ip.c,v 1.2 2001/06/25 19:59:58 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
|
|
* 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[] =
|
|
"@(#) Header: /tcpdump/master/tcpdump/print-ip.c,v 1.98 2001/06/15 22:17:33 fenner Exp (LBL)";
|
|
#else
|
|
__RCSID("$NetBSD: print-ip.c,v 1.2 2001/06/25 19:59:58 itojun Exp $");
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "addrtoname.h"
|
|
#include "interface.h"
|
|
#include "extract.h" /* must come after interface.h */
|
|
|
|
#include "ip.h"
|
|
|
|
/* Compatibility */
|
|
#ifndef IPPROTO_ND
|
|
#define IPPROTO_ND 77
|
|
#endif
|
|
|
|
/*
|
|
* print the recorded route in an IP RR, LSRR or SSRR option.
|
|
*/
|
|
static void
|
|
ip_printroute(const char *type, register const u_char *cp, u_int length)
|
|
{
|
|
register u_int ptr = cp[2] - 1;
|
|
register u_int len;
|
|
|
|
printf(" %s{", type);
|
|
if ((length + 1) & 3)
|
|
printf(" [bad length %d]", length);
|
|
if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
|
|
printf(" [bad ptr %d]", cp[2]);
|
|
|
|
type = "";
|
|
for (len = 3; len < length; len += 4) {
|
|
if (ptr == len)
|
|
type = "#";
|
|
printf("%s%s", type, ipaddr_string(&cp[len]));
|
|
type = " ";
|
|
}
|
|
printf("%s}", ptr == len? "#" : "");
|
|
}
|
|
|
|
static void
|
|
ip_printts(register const u_char *cp, u_int length)
|
|
{
|
|
register u_int ptr = cp[2] - 1;
|
|
register u_int len = 0;
|
|
int hoplen;
|
|
char *type;
|
|
|
|
printf(" TS{");
|
|
hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
|
|
if ((length - 4) & (hoplen-1))
|
|
printf("[bad length %d]", length);
|
|
if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
|
|
printf("[bad ptr %d]", cp[2]);
|
|
switch (cp[3]&0xF) {
|
|
case IPOPT_TS_TSONLY:
|
|
printf("TSONLY");
|
|
break;
|
|
case IPOPT_TS_TSANDADDR:
|
|
printf("TS+ADDR");
|
|
break;
|
|
/*
|
|
* prespecified should really be 3, but some ones might send 2
|
|
* instead, and the IPOPT_TS_PRESPEC constant can apparently
|
|
* have both values, so we have to hard-code it here.
|
|
*/
|
|
|
|
case 2:
|
|
printf("PRESPEC2.0");
|
|
break;
|
|
case 3: /* IPOPT_TS_PRESPEC */
|
|
printf("PRESPEC");
|
|
break;
|
|
default:
|
|
printf("[bad ts type %d]", cp[3]&0xF);
|
|
goto done;
|
|
}
|
|
|
|
type = " ";
|
|
for (len = 4; len < length; len += hoplen) {
|
|
if (ptr == len)
|
|
type = " ^ ";
|
|
printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
|
|
hoplen!=8 ? "" : ipaddr_string(&cp[len]));
|
|
type = " ";
|
|
}
|
|
|
|
done:
|
|
printf("%s", ptr == len ? " ^ " : "");
|
|
|
|
if (cp[3]>>4)
|
|
printf(" [%d hops not recorded]} ", cp[3]>>4);
|
|
else
|
|
printf("}");
|
|
}
|
|
|
|
/*
|
|
* print IP options.
|
|
*/
|
|
static void
|
|
ip_optprint(register const u_char *cp, u_int length)
|
|
{
|
|
register u_int len;
|
|
|
|
for (; length > 0; cp += len, length -= len) {
|
|
int tt = *cp;
|
|
|
|
if (tt == IPOPT_NOP || tt == IPOPT_EOL)
|
|
len = 1;
|
|
else {
|
|
if (&cp[1] >= snapend) {
|
|
printf("[|ip]");
|
|
return;
|
|
}
|
|
len = cp[1];
|
|
}
|
|
if (len <= 0) {
|
|
printf("[|ip op len %d]", len);
|
|
return;
|
|
}
|
|
if (&cp[1] >= snapend || cp + len > snapend) {
|
|
printf("[|ip]");
|
|
return;
|
|
}
|
|
switch (tt) {
|
|
|
|
case IPOPT_EOL:
|
|
printf(" EOL");
|
|
if (length > 1)
|
|
printf("-%d", length - 1);
|
|
return;
|
|
|
|
case IPOPT_NOP:
|
|
printf(" NOP");
|
|
break;
|
|
|
|
case IPOPT_TS:
|
|
ip_printts(cp, len);
|
|
break;
|
|
|
|
#ifndef IPOPT_SECURITY
|
|
#define IPOPT_SECURITY 130
|
|
#endif /* IPOPT_SECURITY */
|
|
case IPOPT_SECURITY:
|
|
printf(" SECURITY{%d}", len);
|
|
break;
|
|
|
|
case IPOPT_RR:
|
|
ip_printroute("RR", cp, len);
|
|
break;
|
|
|
|
case IPOPT_SSRR:
|
|
ip_printroute("SSRR", cp, len);
|
|
break;
|
|
|
|
case IPOPT_LSRR:
|
|
ip_printroute("LSRR", cp, len);
|
|
break;
|
|
|
|
#ifndef IPOPT_RA
|
|
#define IPOPT_RA 148 /* router alert */
|
|
#endif
|
|
case IPOPT_RA:
|
|
printf(" RA");
|
|
if (len != 4)
|
|
printf("{%d}", len);
|
|
else if (cp[2] || cp[3])
|
|
printf("%d.%d", cp[2], cp[3]);
|
|
break;
|
|
|
|
default:
|
|
printf(" IPOPT-%d{%d}", cp[0], len);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* compute an IP header checksum.
|
|
* don't modifiy the packet.
|
|
*/
|
|
u_short
|
|
in_cksum(const u_short *addr, register int len, u_short csum)
|
|
{
|
|
int nleft = len;
|
|
const u_short *w = addr;
|
|
u_short answer;
|
|
int sum = csum;
|
|
|
|
/*
|
|
* Our algorithm is simple, using a 32 bit accumulator (sum),
|
|
* we add sequential 16 bit words to it, and at the end, fold
|
|
* back all the carry bits from the top 16 bits into the lower
|
|
* 16 bits.
|
|
*/
|
|
while (nleft > 1) {
|
|
sum += *w++;
|
|
nleft -= 2;
|
|
}
|
|
if (nleft == 1)
|
|
sum += htons(*(u_char *)w<<8);
|
|
|
|
/*
|
|
* add back carry outs from top 16 bits to low 16 bits
|
|
*/
|
|
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
|
|
sum += (sum >> 16); /* add carry */
|
|
answer = ~sum; /* truncate to 16 bits */
|
|
return (answer);
|
|
}
|
|
|
|
/*
|
|
* print an IP datagram.
|
|
*/
|
|
void
|
|
ip_print(register const u_char *bp, register u_int length)
|
|
{
|
|
register const struct ip *ip;
|
|
register u_int hlen, len, len0, off;
|
|
register const u_char *cp;
|
|
u_char nh;
|
|
int advance;
|
|
|
|
ip = (const struct ip *)bp;
|
|
#ifdef LBL_ALIGN
|
|
/*
|
|
* If the IP header is not aligned, copy into abuf.
|
|
* This will never happen with BPF. It does happen raw packet
|
|
* dumps from -r.
|
|
*/
|
|
if ((long)ip & 3) {
|
|
static u_char *abuf = NULL;
|
|
static int didwarn = 0;
|
|
|
|
if (abuf == NULL) {
|
|
abuf = (u_char *)malloc(snaplen);
|
|
if (abuf == NULL)
|
|
error("ip_print: malloc");
|
|
}
|
|
memcpy((char *)abuf, (char *)ip, min(length, snaplen));
|
|
snapend += abuf - (u_char *)ip;
|
|
packetp = abuf;
|
|
ip = (struct ip *)abuf;
|
|
/* We really want libpcap to give us aligned packets */
|
|
if (!didwarn) {
|
|
warning("compensating for unaligned libpcap packets");
|
|
++didwarn;
|
|
}
|
|
}
|
|
#endif
|
|
if ((u_char *)(ip + 1) > snapend) {
|
|
printf("[|ip]");
|
|
return;
|
|
}
|
|
if (length < sizeof (struct ip)) {
|
|
(void)printf("truncated-ip %d", length);
|
|
return;
|
|
}
|
|
hlen = IP_HL(ip) * 4;
|
|
if (hlen < sizeof (struct ip)) {
|
|
(void)printf("bad-hlen %d", hlen);
|
|
return;
|
|
}
|
|
|
|
len = ntohs(ip->ip_len);
|
|
if (length < len)
|
|
(void)printf("truncated-ip - %d bytes missing! ",
|
|
len - length);
|
|
len -= hlen;
|
|
len0 = len;
|
|
|
|
/*
|
|
* If this is fragment zero, hand it to the next higher
|
|
* level protocol.
|
|
*/
|
|
off = ntohs(ip->ip_off);
|
|
if ((off & 0x1fff) == 0) {
|
|
cp = (const u_char *)ip + hlen;
|
|
nh = ip->ip_p;
|
|
|
|
#ifndef IPPROTO_SCTP
|
|
#define IPPROTO_SCTP 132
|
|
#endif
|
|
if (nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
|
|
nh != IPPROTO_SCTP) {
|
|
(void)printf("%s > %s: ", ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
}
|
|
again:
|
|
switch (nh) {
|
|
|
|
#ifndef IPPROTO_AH
|
|
#define IPPROTO_AH 51
|
|
#endif
|
|
case IPPROTO_AH:
|
|
nh = *cp;
|
|
advance = ah_print(cp, (const u_char *)ip);
|
|
cp += advance;
|
|
len -= advance;
|
|
goto again;
|
|
|
|
#ifndef IPPROTO_ESP
|
|
#define IPPROTO_ESP 50
|
|
#endif
|
|
case IPPROTO_ESP:
|
|
{
|
|
int enh;
|
|
advance = esp_print(cp, (const u_char *)ip, &enh);
|
|
cp += advance;
|
|
len -= advance;
|
|
if (enh < 0)
|
|
break;
|
|
nh = enh & 0xff;
|
|
goto again;
|
|
}
|
|
|
|
#ifndef IPPROTO_IPCOMP
|
|
#define IPPROTO_IPCOMP 108
|
|
#endif
|
|
case IPPROTO_IPCOMP:
|
|
{
|
|
int enh;
|
|
advance = ipcomp_print(cp, (const u_char *)ip, &enh);
|
|
cp += advance;
|
|
len -= advance;
|
|
if (enh < 0)
|
|
break;
|
|
nh = enh & 0xff;
|
|
goto again;
|
|
}
|
|
|
|
case IPPROTO_SCTP:
|
|
sctp_print(cp, (const u_char *)ip, len);
|
|
break;
|
|
|
|
case IPPROTO_TCP:
|
|
tcp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
|
|
break;
|
|
|
|
case IPPROTO_UDP:
|
|
udp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
|
|
break;
|
|
|
|
case IPPROTO_ICMP:
|
|
icmp_print(cp, len, (const u_char *)ip);
|
|
break;
|
|
|
|
#ifndef IPPROTO_IGRP
|
|
#define IPPROTO_IGRP 9
|
|
#endif
|
|
case IPPROTO_IGRP:
|
|
igrp_print(cp, len, (const u_char *)ip);
|
|
break;
|
|
|
|
case IPPROTO_ND:
|
|
(void)printf(" nd %d", len);
|
|
break;
|
|
|
|
case IPPROTO_EGP:
|
|
egp_print(cp, len, (const u_char *)ip);
|
|
break;
|
|
|
|
#ifndef IPPROTO_OSPF
|
|
#define IPPROTO_OSPF 89
|
|
#endif
|
|
case IPPROTO_OSPF:
|
|
ospf_print(cp, len, (const u_char *)ip);
|
|
break;
|
|
|
|
#ifndef IPPROTO_IGMP
|
|
#define IPPROTO_IGMP 2
|
|
#endif
|
|
case IPPROTO_IGMP:
|
|
igmp_print(cp, len, (const u_char *)ip);
|
|
break;
|
|
|
|
case 4:
|
|
/* DVMRP multicast tunnel (ip-in-ip encapsulation) */
|
|
ip_print(cp, len);
|
|
if (! vflag) {
|
|
printf(" (ipip-proto-4)");
|
|
return;
|
|
}
|
|
break;
|
|
|
|
#ifdef INET6
|
|
#ifndef IP6PROTO_ENCAP
|
|
#define IP6PROTO_ENCAP 41
|
|
#endif
|
|
case IP6PROTO_ENCAP:
|
|
/* ip6-in-ip encapsulation */
|
|
ip6_print(cp, len);
|
|
break;
|
|
#endif /*INET6*/
|
|
|
|
|
|
#ifndef IPPROTO_GRE
|
|
#define IPPROTO_GRE 47
|
|
#endif
|
|
case IPPROTO_GRE:
|
|
/* do it */
|
|
gre_print(cp, len);
|
|
break;
|
|
|
|
#ifndef IPPROTO_MOBILE
|
|
#define IPPROTO_MOBILE 55
|
|
#endif
|
|
case IPPROTO_MOBILE:
|
|
mobile_print(cp, len);
|
|
break;
|
|
|
|
#ifndef IPPROTO_PIM
|
|
#define IPPROTO_PIM 103
|
|
#endif
|
|
case IPPROTO_PIM:
|
|
pim_print(cp, len);
|
|
break;
|
|
|
|
#ifndef IPPROTO_VRRP
|
|
#define IPPROTO_VRRP 112
|
|
#endif
|
|
case IPPROTO_VRRP:
|
|
vrrp_print(cp, len, ip->ip_ttl);
|
|
break;
|
|
|
|
default:
|
|
(void)printf(" ip-proto-%d %d", nh, len);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Ultra quiet now means that all this stuff should be suppressed */
|
|
/* res 3-Nov-98 */
|
|
if (qflag > 1) return;
|
|
|
|
|
|
/*
|
|
* for fragmented datagrams, print id:size@offset. On all
|
|
* but the last stick a "+". For unfragmented datagrams, note
|
|
* the don't fragment flag.
|
|
*/
|
|
len = len0; /* get the original length */
|
|
if (off & 0x3fff) {
|
|
/*
|
|
* if this isn't the first frag, we're missing the
|
|
* next level protocol header. print the ip addr.
|
|
*/
|
|
if (off & 0x1fff)
|
|
(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
#ifndef IP_MF
|
|
#define IP_MF 0x2000
|
|
#endif /* IP_MF */
|
|
#ifndef IP_DF
|
|
#define IP_DF 0x4000
|
|
#endif /* IP_DF */
|
|
(void)printf(" (frag %d:%u@%d%s)", ntohs(ip->ip_id), len,
|
|
(off & 0x1fff) * 8,
|
|
(off & IP_MF)? "+" : "");
|
|
|
|
} else if (off & IP_DF)
|
|
(void)printf(" (DF)");
|
|
|
|
if (ip->ip_tos) {
|
|
(void)printf(" [tos 0x%x", (int)ip->ip_tos);
|
|
/* ECN bits */
|
|
if (ip->ip_tos & 0x03) {
|
|
switch (ip->ip_tos & 0x03) {
|
|
case 1:
|
|
(void)printf(",ECT(1)");
|
|
break;
|
|
case 2:
|
|
(void)printf(",ECT(0)");
|
|
break;
|
|
case 3:
|
|
(void)printf(",CE");
|
|
}
|
|
}
|
|
(void)printf("] ");
|
|
}
|
|
|
|
if (ip->ip_ttl <= 1)
|
|
(void)printf(" [ttl %d]", (int)ip->ip_ttl);
|
|
|
|
if (vflag) {
|
|
int sum;
|
|
char *sep = "";
|
|
|
|
printf(" (");
|
|
if (ip->ip_ttl > 1) {
|
|
(void)printf("%sttl %d", sep, (int)ip->ip_ttl);
|
|
sep = ", ";
|
|
}
|
|
if ((off & 0x3fff) == 0) {
|
|
(void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
|
|
sep = ", ";
|
|
}
|
|
(void)printf("%slen %d", sep, (int)ntohs(ip->ip_len));
|
|
sep = ", ";
|
|
if ((u_char *)ip + hlen <= snapend) {
|
|
sum = in_cksum((const u_short *)ip, hlen, 0);
|
|
if (sum != 0) {
|
|
(void)printf("%sbad cksum %x!", sep,
|
|
ntohs(ip->ip_sum));
|
|
sep = ", ";
|
|
}
|
|
}
|
|
if ((hlen -= sizeof(struct ip)) > 0) {
|
|
(void)printf("%soptlen=%d", sep, hlen);
|
|
ip_optprint((u_char *)(ip + 1), hlen);
|
|
}
|
|
printf(")");
|
|
}
|
|
}
|
|
|
|
void
|
|
ipN_print(register const u_char *bp, register u_int length)
|
|
{
|
|
struct ip *ip, hdr;
|
|
|
|
ip = (struct ip *)bp;
|
|
if (length < 4) {
|
|
(void)printf("truncated-ip %d", length);
|
|
return;
|
|
}
|
|
memcpy (&hdr, (char *)ip, 4);
|
|
switch (IP_V(&hdr)) {
|
|
case 4:
|
|
ip_print (bp, length);
|
|
return;
|
|
#ifdef INET6
|
|
case 6:
|
|
ip6_print (bp, length);
|
|
return;
|
|
#endif
|
|
default:
|
|
(void)printf("unknown ip %d", IP_V(&hdr));
|
|
return;
|
|
}
|
|
}
|