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/*
* $smu-mark$
* $name: sendudp.c$
* $author: Salvatore Sanfilippo <antirez@invece.org>$
* $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$
* $license: This software is under GPL version 2 of license$
* $date: Fri Nov 5 11:55:49 MET 1999$
* $rev: 8$
*/

/* $Id: sendudp.c,v 1.2 2003/09/01 00:22:06 antirez Exp $ */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <signal.h>

#include "hping2.h"
#include "globals.h"

/* void hexdumper(unsigned char *packet, int size); */

void send_udp(void)
{
int packet_size;
char *packet, *data;
struct myudphdr *udp;
struct pseudohdr *pseudoheader;

packet_size = UDPHDR_SIZE + data_size;
packet = malloc(PSEUDOHDR_SIZE + packet_size);
if (packet == NULL) {
perror("[send_udphdr] malloc()");
return;
}
pseudoheader = (struct pseudohdr*) packet;
udp = (struct myudphdr*) (packet+PSEUDOHDR_SIZE);
data = (char*) (packet+PSEUDOHDR_SIZE+UDPHDR_SIZE);

memset(packet, 0, PSEUDOHDR_SIZE+packet_size);

/* udp pseudo header */
memcpy(&pseudoheader->saddr, &local.sin_addr.s_addr, 4);
memcpy(&pseudoheader->daddr, &remote.sin_addr.s_addr, 4);
pseudoheader->protocol = 17; /* udp */
pseudoheader->lenght = htons(packet_size);

/* udp header */
udp->uh_dport = htons(dst_port);
udp->uh_sport = htons(src_port);
udp->uh_ulen = htons(packet_size);

/* data */
data_handler(data, data_size);

/* compute checksum */
#ifdef STUPID_SOLARIS_CHECKSUM_BUG
udp->uh_sum = packet_size;
#else
udp->uh_sum = cksum((__u16*) packet, PSEUDOHDR_SIZE +
packet_size);
#endif

/* adds this pkt in delaytable */
delaytable_add(sequence, src_port, time(NULL), get_usec(), S_SENT);

/* send packet */
send_ip_handler(packet+PSEUDOHDR_SIZE, packet_size);
free(packet);

sequence++; /* next sequence number */

if (!opt_keepstill)
src_port = (sequence + initsport) % 65536;

if (opt_force_incdport)
dst_port++;
}
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