linux c 简单端口扫描程序

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <pthread.h>
#include <semaphore.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>

int SERVER_PORT= 1;

#define  SERVER_IP   "127.0.0.1"
#define  WRITE_BUF_SIZE  1024

#define  SUCCESS 0
#define  FAILURE -1

int main(int argc, char **argv)
{
	int sfd;
	int iReadNum;
	char acBuf[WRITE_BUF_SIZE];
	struct sockaddr_in saddr;
	int socklen;
	int iClientLen;
	int iReturn;

	if(argc!=2)
	{
		printf("usage:./a.out 127.0.0.1\n");
		return FAILURE;
	}
	printf("scanning port 1-8888...... \n");

	while(SERVER_PORT<8889)
	{
		//socket_init
		sfd = socket(AF_INET, SOCK_STREAM, 0);
		if (sfd < 0)
		{
			perror("socket()");
			return FAILURE;
		}
		//套接口设置
		saddr.sin_family = AF_INET;
		//inet_pton将点分十进制--》二进制整数
		inet_pton(AF_INET, argv[1], &saddr.sin_addr);
		saddr.sin_port = htons(SERVER_PORT);
		socklen = sizeof(saddr);

		//尝试连接自己的地址以及端口
		iReturn = connect(sfd, (const struct sockaddr *)&saddr, socklen);
		if(iReturn >= 0)
		{
			sleep(1);
			printf("port %d open\n",SERVER_PORT);
		}

		close(sfd);
		SERVER_PORT++;
	}
	return SUCCESS;
}