365 lines
8.3 KiB
C
365 lines
8.3 KiB
C
/* $NetBSD: print-ip.c,v 1.3 1995/03/06 19:11:14 mycroft Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
|
|
* 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 char rcsid[] =
|
|
"@(#) Header: print-ip.c,v 1.38 94/06/14 20:17:40 leres Exp (LBL)";
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.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>
|
|
#include <netinet/tcpip.h>
|
|
|
|
#include <stdio.h>
|
|
#ifdef __STDC__
|
|
#include <stdlib.h>
|
|
#endif
|
|
#include <unistd.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
|
|
static void
|
|
igmp_print(register const u_char *bp, register int len,
|
|
register const u_char *bp2)
|
|
{
|
|
register const struct ip *ip;
|
|
register const u_char *ep;
|
|
|
|
ip = (const struct ip *)bp2;
|
|
ep = (const u_char *)snapend;
|
|
(void)printf("%s > %s: ",
|
|
ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
|
|
if (bp + 7 > ep) {
|
|
(void)printf("[|igmp]");
|
|
return;
|
|
}
|
|
switch (bp[0] & 0xf) {
|
|
case 1:
|
|
(void)printf("igmp query");
|
|
if (*(int *)&bp[4])
|
|
(void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
|
|
if (len != 8)
|
|
(void)printf(" [len %d]", len);
|
|
break;
|
|
case 2:
|
|
(void)printf("igmp report %s", ipaddr_string(&bp[4]));
|
|
if (len != 8)
|
|
(void)printf(" [len %d]", len);
|
|
break;
|
|
case 3:
|
|
(void)printf("igmp dvmrp %s", ipaddr_string(&bp[4]));
|
|
if (len < 8)
|
|
(void)printf(" [len %d]", len);
|
|
break;
|
|
default:
|
|
(void)printf("igmp-%d", bp[0] & 0xf);
|
|
break;
|
|
}
|
|
if ((bp[0] >> 4) != 1)
|
|
(void)printf(" [v%d]", bp[0] >> 4);
|
|
if (bp[1])
|
|
(void)printf(" [b1=0x%x]", bp[1]);
|
|
}
|
|
|
|
/*
|
|
* print the recorded route in an IP RR, LSRR or SSRR option.
|
|
*/
|
|
static void
|
|
ip_printroute(const char *type, register const u_char *cp, int length)
|
|
{
|
|
int ptr = cp[2] - 1;
|
|
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 = "#";
|
|
#ifdef TCPDUMP_ALIGN
|
|
{
|
|
struct in_addr addr;
|
|
bcopy((char *)&cp[len], (char *)&addr, sizeof(addr));
|
|
printf("%s%s", type, ipaddr_string(&addr));
|
|
}
|
|
#else
|
|
printf("%s%s", type, ipaddr_string(&cp[len]));
|
|
#endif
|
|
type = " ";
|
|
}
|
|
printf("%s}", ptr == len? "#" : "");
|
|
}
|
|
|
|
/*
|
|
* print IP options.
|
|
*/
|
|
static void
|
|
ip_optprint(register const u_char *cp, int length)
|
|
{
|
|
int len;
|
|
|
|
for (; length > 0; cp += len, length -= len) {
|
|
int tt = *cp;
|
|
|
|
len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
|
|
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:
|
|
printf(" TS{%d}", len);
|
|
break;
|
|
|
|
case IPOPT_SECURITY:
|
|
printf(" SECURITY{%d}", len);
|
|
break;
|
|
|
|
case IPOPT_RR:
|
|
printf(" RR{%d}=", len);
|
|
ip_printroute("RR", cp, len);
|
|
break;
|
|
|
|
case IPOPT_SSRR:
|
|
ip_printroute("SSRR", cp, len);
|
|
break;
|
|
|
|
case IPOPT_LSRR:
|
|
ip_printroute("LSRR", cp, len);
|
|
break;
|
|
|
|
default:
|
|
printf(" IPOPT-%d{%d}", cp[0], len);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* compute an IP header checksum.
|
|
* don't modifiy the packet.
|
|
*/
|
|
static int
|
|
in_cksum(const struct ip *ip)
|
|
{
|
|
register const u_short *sp = (u_short *)ip;
|
|
register u_int32 sum = 0;
|
|
register int count;
|
|
|
|
/*
|
|
* No need for endian conversions.
|
|
*/
|
|
for (count = ip->ip_hl * 2; --count >= 0; )
|
|
sum += *sp++;
|
|
while (sum > 0xffff)
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
sum = ~sum & 0xffff;
|
|
|
|
return (sum);
|
|
}
|
|
|
|
/*
|
|
* print an IP datagram.
|
|
*/
|
|
void
|
|
ip_print(register const u_char *bp, register int length)
|
|
{
|
|
register const struct ip *ip;
|
|
register int hlen;
|
|
register int len;
|
|
register int off;
|
|
register const u_char *cp;
|
|
|
|
ip = (const struct ip *)bp;
|
|
#ifdef TCPDUMP_ALIGN
|
|
/*
|
|
* The IP header is not word aligned, so copy into abuf.
|
|
* This will never happen with BPF. It does happen raw packet
|
|
* dumps from -r.
|
|
*/
|
|
if ((int)ip & (sizeof(long)-1)) {
|
|
static u_char *abuf;
|
|
|
|
if (abuf == 0)
|
|
abuf = (u_char *)malloc(snaplen);
|
|
bcopy((char *)ip, (char *)abuf, min(length, snaplen));
|
|
snapend += abuf - (u_char *)ip;
|
|
packetp = abuf;
|
|
ip = (struct ip *)abuf;
|
|
}
|
|
#endif
|
|
if ((u_char *)(ip + 1) > snapend) {
|
|
printf("[|ip]");
|
|
return;
|
|
}
|
|
if (length < sizeof (struct ip)) {
|
|
(void)printf("truncated-ip %d", length);
|
|
return;
|
|
}
|
|
hlen = ip->ip_hl * 4;
|
|
|
|
len = ntohs(ip->ip_len);
|
|
if (length < len)
|
|
(void)printf("truncated-ip - %d bytes missing!",
|
|
len - length);
|
|
len -= hlen;
|
|
|
|
/*
|
|
* 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;
|
|
switch (ip->ip_p) {
|
|
|
|
case IPPROTO_TCP:
|
|
tcp_print(cp, len, (const u_char *)ip);
|
|
break;
|
|
case IPPROTO_UDP:
|
|
udp_print(cp, len, (const u_char *)ip);
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
icmp_print(cp, (const u_char *)ip);
|
|
break;
|
|
case IPPROTO_ND:
|
|
(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
(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;
|
|
#ifndef IPPROTO_ENCAP
|
|
#define IPPROTO_ENCAP 4
|
|
#endif
|
|
case IPPROTO_ENCAP:
|
|
/* ip-in-ip encapsulation */
|
|
if (vflag)
|
|
(void)printf("%s > %s: ",
|
|
ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
ip_print(cp, len);
|
|
if (! vflag) {
|
|
printf(" (encap)");
|
|
return;
|
|
}
|
|
break;
|
|
default:
|
|
(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
(void)printf(" ip-proto-%d %d", ip->ip_p, len);
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* for fragmented datagrams, print id:size@offset. On all
|
|
* but the last stick a "+". For unfragmented datagrams, note
|
|
* the don't fragment flag.
|
|
*/
|
|
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));
|
|
(void)printf(" (frag %d:%d@%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);
|
|
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 = ", ";
|
|
}
|
|
sum = in_cksum(ip);
|
|
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(")");
|
|
}
|
|
}
|