/*  * $smu-mark$  * $name: listen.c$  * $author: Salvatore Sanfilippo <antirez@invece.org>$  * $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$  * $license: This software is under GPL version 2 of license$  * $date: Fri Nov  5 11:55:48 MET 1999$  * $rev: 8$  */ #include <stdio.h>#include <string.h>#include <unistd.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include "hping2.h" /* hping2.h includes hcmp.h */#include "globals.h"void listenmain(void){	int size;	int stdoutFD = fileno(stdout);	char packet[LINK_PACKETSIZE];	char *p;	struct myiphdr *ip = (struct myiphdr*) (packet+ABS_OFFSETIP);	__u16 id;	static __u16 exp_id; /* expected id */	exp_id = 1;	while(1)	{#if (!defined OSTYPE_LINUX) || (defined FORCE_LIBPCAP)		size = pcap_recv(packet, LINK_PACKETSIZE);		if (size == -1) {			perror("[wait_packet] pcap_recv()");			return;		}#else		size = recv(sockpacket, packet, LINK_PACKETSIZE, 0);		if (size == -1)			continue;#endif /* !OSTYPE_LINUX || FORCE_LIBPCAP */		id = ntohs(ip->id);		if ((p = memstr(packet, sign, size)))		{			if (opt_verbose)				fprintf(stderr, "packet %d received\n", id);			if (opt_safe)			{				if (id == exp_id)					exp_id++;				else				{					if (opt_verbose)						fprintf(stderr, "packet not in sequence (id %d) received\n", id);					send_hcmp(HCMP_RESTART, exp_id);					if (opt_verbose)						fprintf(stderr, "HCMP restart from %d sent\n", exp_id);					continue; /* discard this packet */				}			}			p+=strlen(sign);			write(stdoutFD, p, size-(p-packet));		}	}}