80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/*
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* $smu-mark$
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* $name: listen.c$
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* $author: Salvatore Sanfilippo <antirez@invece.org>$
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* $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$
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* $license: This software is under GPL version 2 of license$
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* $date: Fri Nov 5 11:55:48 MET 1999$
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* $rev: 8$
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include "hping2.h" /* hping2.h includes hcmp.h */
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#include "globals.h"
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void listenmain(void)
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{
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int size, ip_size;
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int stdoutFD = fileno(stdout);
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char packet[IP_MAX_SIZE+linkhdr_size];
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char *p, *ip_packet;
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struct myiphdr ip;
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__u16 id;
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static __u16 exp_id; /* expected id */
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exp_id = 1;
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while(1) {
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size = read_packet(packet, IP_MAX_SIZE+linkhdr_size);
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switch(size) {
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case 0:
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continue;
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case -1:
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exit(1);
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}
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/* Skip truncated packets */
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if (size < linkhdr_size+IPHDR_SIZE)
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continue;
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ip_packet = packet + linkhdr_size;
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/* copy the ip header so it will be aligned */
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memcpy(&ip, ip_packet, sizeof(ip));
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id = ntohs(ip.id);
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ip_size = ntohs(ip.tot_len);
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if (size-linkhdr_size > ip_size)
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size = ip_size;
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else
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size -= linkhdr_size;
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if ((p = memstr(ip_packet, sign, size))) {
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if (opt_verbose)
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fprintf(stderr, "packet %d received\n", id);
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if (opt_safe) {
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if (id == exp_id)
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exp_id++;
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else {
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if (opt_verbose)
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fprintf(stderr, "packet not in sequence (id %d) received\n", id);
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send_hcmp(HCMP_RESTART, exp_id);
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if (opt_verbose)
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fprintf(stderr, "HCMP restart from %d sent\n", exp_id);
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continue; /* discard this packet */
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}
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}
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p+=strlen(sign);
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write(stdoutFD, p, size-(p-ip_packet));
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}
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}
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}
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