/*-
 * 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/udp_print.c,v 1.7 2005/03/10 01:24:16 modulus Exp $";
#endif

#include "ipex_includes.h"

int
print_udp(u_char *b, struct pcap_pkthdr *h, u_char *p)
{
	char *d;
	int len;
	struct ip *ip = (struct ip *)(p + opts.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 udphdr *udp = (struct udphdr *)(((char *)ip) + ip_hl);
	unsigned udp_off = (frag) ? 0 : sizeof(struct udphdr);
        struct ehdr *mhdr = NULL;
        u_32_t *sa, *da;

	d = ((char *)udp) + (udp_off);
	len = (ntohs(ip->ip_len) - ip_hl - udp_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);
#if (defined(USE_DUMB_UDP_HEADERS))
	printf("%s %s%s:%s ",
	    time_stamp(&h->ts, x->thiszone),
	    (opts.Lflags ? mhdr->smac : ""),
	    hostname(4, sa),
	    portname(opts.pflag, "udp", ntohs(udp->source)));
	printf( "> %s%s:%s udp",
	    (opts.Lflag ? mhdr->dmac : ""),
	    hostname(4, da),
	    portname(opts.pflag, "udp", ntohs(udp->dest)));
#else
	printf("%s %s%s:%s ",
	    time_stamp(&h->ts, opts.thiszone),
	    (opts.Lflag ? mhdr->smac : ""),
	    hostname(4, sa),
	    portname(opts.nflag, "udp", udp->uh_sport));
	printf("> %s%s:%s udp",
	    (opts.Lflag ? mhdr->dmac : ""),
	    hostname(4, da),
	    portname(opts.nflag, "udp", udp->uh_dport));
#endif
        if (frag) {
		printf( " %d:%d@%d%s\n",
		    ntohs(ip->ip_id), 
		    len, frag_off,
		    frag_off ? "" : "+");
        }
	else
		printf( " (DF)\n");
	return (0);
}