/*-
 * Copyright (c) 2001-2005 Christian S.J. Peron
 * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 */
#ifndef lint
static const char rcsid[] =
        "@(#) $Header: /usr/cvs/ipex/icmp_print.c,v 1.7 2005/02/25 08:46:11 modulus Exp $";
#endif

#include "ipex_includes.h"

struct icmp_types {
	unsigned char	type;
	char		*section_text;
};

static struct icmp_types p_types[]= {
	{ ICMP_ECHOREPLY,	"echo rep" },
	{ ICMP_UNREACH,		"unreach" },
	{ ICMP_SOURCEQUENCH,	"source quench" },
	{ ICMP_REDIRECT,	"redirect" },
	{ ICMP_ECHO,		"echo req" },
	{ ICMP_ROUTERADVERT,	"router-advert" },
	{ ICMP_ROUTERSOLICIT,	"router-solici" },
	{ ICMP_TIMXCEED,	"time exceed" },
	{ ICMP_PARAMPROB,	"smashed ip head" },
	{ ICMP_TSTAMP,		"time stamp req" },
	{ ICMP_TSTAMPREPLY,	"time stamp rep" },
	{ ICMP_IREQ,		"info req" },
	{ ICMP_IREQREPLY,	"info rep" },
	{ ICMP_MASKREQ,		"mask req" },
	{ ICMP_MASKREPLY,	"mask rep" },
	{ 0,			NULL },
};

char *
get_icmp_type(unsigned char icmp_t)
{
	struct icmp_types *p;

	for(p = p_types; p->section_text; ++p)
		if (icmp_t == p->type) 
			return (p->section_text);
	return (NULL);
}

int 
print_icmp(u_char *b, struct pcap_pkthdr *h, u_char *p)
{
	struct cmdopts *x = &opts;
	char *d;
	int len;
	 struct ip *ip = (struct ip *)(p + x->loffset);
	unsigned ip_hl = (ip->ip_hl * 0x4);
	unsigned ip_off = ntohs(ip->ip_off);
	unsigned frag =  ip_off & (IP_MF|IP_OFFMASK);
        unsigned frag_off = frag ? (ip_off & IP_OFFMASK) * 8:0;
	 struct icmp *icmp = (struct icmp *)(((char *)ip) + ip_hl);
	unsigned icmp_off = frag ? 0 : 4;
        u_32_t *sa, *da;
        struct ehdr *mhdr;

	mhdr = NULL;
	d = ((char *)icmp) + (icmp_off);
	len = (ntohs(ip->ip_len) - ip_hl - icmp_off);
        sa = (u_32_t *)&ip->ip_src;
        da = (u_32_t *)&ip->ip_dst;
        if (opts.Lflag)
		mhdr = process_link_headers(b, h, p);
	printf("%s %s%s > ",
	    time_stamp(&h->ts, x->thiszone),
	    (opts.Lflag ? mhdr->smac : "" ),
	    hostname(4, sa));
	printf( "%s%s icmp %s pattern: 0x%02x",
	    (opts.Lflag ? mhdr->smac : "" ),
	    hostname(4, da),
	    get_icmp_type(icmp->icmp_type), d[13]);
        if (frag) {
		printf(" %d:%d@%d%s\n",
		    ntohs(ip->ip_id),
		    len, frag_off,
		    frag_off ? "" : "+");
	} else {
		printf( " (DF)\n");
	}
	return (1);
}