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/* $OpenBSD: print-etherip.c,v 1.7 2014/08/14 12:44:44 mpi Exp $ */
/*
* Copyright (c) 2001 Jason L. Wright (jason@thought.net)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Format and print etherip packets
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.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/if_ether.h>
#include <netinet/ip_ether.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stddef.h>
#include "addrtoname.h"
#include "interface.h"
#include "extract.h" /* must come after interface.h */
extern u_short extracted_ethertype;
void
etherip_print(const u_char *bp, u_int caplen, u_int len, const u_char *bp2)
{
const struct ip *ip = (const struct ip *)bp2;
struct ether_header *eh;
const u_char *pbuf = bp;
u_int plen = caplen, hlen;
u_int16_t etype;
if (plen < sizeof(struct etherip_header)) {
printf("[|etherip]");
return;
}
printf("etherip %s > %s ver ", ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
switch ((*pbuf) & 0xf) {
case 2:
hlen = 1;
printf("%d", 2);
break;
case 3:
hlen = 2;
printf("%d", 3);
break;
default:
hlen = 0;
printf("unknown");
break;
}
printf(" len %d", len);
if (hlen == 0)
return;
printf(": ");
if (plen < hlen) {
printf("[|etherip]");
return;
}
pbuf += hlen;
plen -= hlen;
len -= hlen;
if (eflag)
ether_print(pbuf, len);
eh = (struct ether_header *)pbuf;
if (plen < sizeof(struct ether_header)) {
printf("[|ether]");
return;
}
etype = EXTRACT_16BITS(pbuf + offsetof(struct ether_header, ether_type));
pbuf += sizeof(struct ether_header);
plen -= sizeof(struct ether_header);
len -= sizeof(struct ether_header);
/* XXX LLC? */
extracted_ethertype = 0;
if (etype <= ETHERMTU) {
if (llc_print(pbuf, len, plen, ESRC(eh), EDST(eh)) == 0) {
if (!eflag)
ether_print((u_char *)eh, len);
if (extracted_ethertype) {
printf("LLC %s",
etherproto_string(htons(extracted_ethertype)));
}
if (!xflag && !qflag)
default_print(pbuf, plen);
}
} else if (ether_encap_print(etype, pbuf, len, plen) == 0) {
if (!eflag)
ether_print((u_char *)eh, len + sizeof(*eh));
if (!xflag && !qflag)
default_print(pbuf, plen);
}
}
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