NetBSD/usr.sbin/tcpdump/print-ether.c

126 lines
3.4 KiB
C

/*
* Copyright (c) 1988-1990 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.
*
* $Id: print-ether.c,v 1.1 1993/11/14 21:20:39 deraadt Exp $
*/
#ifndef lint
static char rcsid[] =
"@(#) Header: print-ether.c,v 1.22 91/10/07 20:18:28 leres Exp (LBL)";
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.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 "interface.h"
#include "addrtoname.h"
u_char *packetp;
u_char *snapend;
static inline void
ether_print(ep, length)
register struct ether_header *ep;
int length;
{
if (qflag)
(void)printf("%s %s %d: ",
etheraddr_string(ESRC(ep)),
etheraddr_string(EDST(ep)),
length);
else
(void)printf("%s %s %s %d: ",
etheraddr_string(ESRC(ep)),
etheraddr_string(EDST(ep)),
etherproto_string(ep->ether_type),
length);
}
/*
* This is the top level routine of the printer. 'p' is the points
* to the ether header of the packet, 'tvp' is the timestamp,
* 'length' is the length of the packet off the wire, and 'caplen'
* is the number of bytes actually captured.
*/
void
ether_if_print(p, tvp, length, caplen)
u_char *p;
struct timeval *tvp;
int length;
int caplen;
{
struct ether_header *ep;
register int i;
ts_print(tvp);
if (caplen < sizeof(struct ether_header)) {
printf("[|ether]");
goto out;
}
if (eflag)
ether_print((struct ether_header *)p, length);
/*
* Some printers want to get back at the ethernet addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
packetp = p;
snapend = p + caplen;
length -= sizeof(struct ether_header);
ep = (struct ether_header *)p;
p += sizeof(struct ether_header);
switch (ntohs(ep->ether_type)) {
case ETHERTYPE_IP:
ip_print((struct ip *)p, length);
break;
case ETHERTYPE_ARP:
case ETHERTYPE_REVARP:
arp_print((struct ether_arp *)p, length, caplen - sizeof(*ep));
break;
default:
if (!eflag)
ether_print(ep, length);
if (!xflag && !qflag)
default_print((u_short *)p, caplen - sizeof(*ep));
break;
}
if (xflag)
default_print((u_short *)p, caplen - sizeof(*ep));
out:
putchar('\n');
}