#include <sys/time.h>#include <netinet/in.h>#include <arpa/inet.h>#include <stdlib.h>#include <stdio.h>#include <tcp_scan.h>int info(const struct sockaddr *sockaddr, socklen_t addrlen,		 int state, void *arg){	struct sockaddr_in *sin = (struct sockaddr_in *)sockaddr;	printf("%s:%d ", inet_ntoa(sin->sin_addr), ntohs(sin->sin_port));	switch (state)	{	case TS_ACCEPTED:		printf("Connection accepted\n");		break;	case TS_REFUSED:		printf("Connection refused\n");		break;	case TS_UNREACH:		printf("Destination unreachable\n");		break;	}	return 0;}int main(int argc, char *argv[]){	struct addrseg head;	struct addrseg *cur, *new;	struct in_addr mask;	FILE *file;	char buf1[16], buf2[16], buf3[16];	unsigned short ports[] = { 21, 0 };	unsigned int bit;	time_t curtime;	if (argc != 2)	{		fprintf(stderr, "USAGE: test <address scope file>\n");		exit(1);	}	if (!(file = fopen(argv[1], "r")))	{		perror("fopen");		exit(1);	}	cur = &head;	while (fscanf(file, "%16s%16s%16s\n", buf1, buf2, buf3) != EOF)	{		if (new = (struct addrseg *)malloc(sizeof (struct addrseg)))		{			new->as_family = AF_INET;			if (new->as_address = malloc(sizeof (struct in_addr)))			{				inet_pton(AF_INET, buf1, new->as_address);				inet_pton(AF_INET, buf3, &mask);				new->as_bits = 0;				for (bit = 0xa0000000; bit & ntohl(mask.s_addr); bit >>= 1)					new->as_bits++;				cur->as_next = new;				cur = new;				continue;			}		}		perror("malloc");		exit(1);	}	cur->as_next = NULL;	curtime = time(NULL);	printf("Start at: %s\n", ctime(&curtime));	tcp_scan(head.as_next, ports, 0, "eth0", 1, info, NULL);	curtime = time(NULL);	printf("\nEnd at: %s", ctime(&curtime));}