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first draft

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Alex
2022-04-13 18:01:39 +08:00
commit 906782e134
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sendudp.c Normal file
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/*
* $smu-mark$
* $name: sendudp.c$
* $author: Salvatore Sanfilippo <antirez@invece.org>$
* $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$
* $license: This software is under GPL version 2 of license$
* $date: Fri Nov 5 11:55:49 MET 1999$
* $rev: 8$
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <time.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;
struct pseudohdr6 *pseudoheader6;
int pslen;
if(opt_ipv6)
pslen = PSEUDOHDR6_SIZE;
else
pslen = PSEUDOHDR_SIZE;
packet_size = UDPHDR_SIZE + data_size;
packet = malloc(pslen + packet_size);
if (packet == NULL) {
perror("[send_udphdr] malloc()");
return;
}
pseudoheader = (struct pseudohdr*) packet;
pseudoheader6 = (struct pseudohdr6*) packet;
udp = (struct myudphdr*) (packet+pslen);
data = (char*) (packet+pslen+UDPHDR_SIZE);
memset(packet, 0, pslen+packet_size);
/* udp pseudo header */
if(opt_ipv6)
{
memcpy(&pseudoheader6->saddr, &ADDR6(&local).s6_addr, 16);
memcpy(&pseudoheader6->daddr, &ADDR6(&remote).s6_addr, 16);
pseudoheader6->protocol = IPPROTO_UDP;
pseudoheader6->lenght = htons(packet_size);
}
else
{
memcpy(&pseudoheader->saddr, &ADDR4(&local).s_addr, 4);
memcpy(&pseudoheader->daddr, &ADDR4(&remote).s_addr, 4);
pseudoheader->protocol = IPPROTO_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, pslen + 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+pslen, packet_size);
free(packet);
sequence++; /* next sequence number */
if (!opt_keepstill)
src_port = (sequence + initsport) % 65536;
if (opt_force_incdport)
dst_port++;
}