求助：c++ 测试远程ip绑定端口是否可达

[yangyang0133]

本人想测试一下远程ip的8080,8081,8082端口是否可达，不知道该怎么利用sockets

[ForestDB]

telnet ip 8080

[yangyang0133]

谢谢 请问在c++中怎么实现呢

[yiyefangzhou24]

#include <stdio.h>
#include <winsock.h>
#pragma comment(lib,"Ws2_32.lib")

USHORT checksum(USHORT* buff, int size)
{
	unsigned long cksum = 0;
	while(size>1)
	{
		cksum += *buff++;
		size -= sizeof(USHORT);
	}
	// 是奇数
	if(size)
	{
		cksum += *(UCHAR*)buff;
	}
	// 将32位的chsum高16位和低16位相加，然后取反
	cksum = (cksum >> 16) + (cksum & 0xffff);
	cksum += (cksum >> 16);    // ??? 
	return (USHORT)(~cksum);
}



typedef struct icmp_hdr
{
    unsigned char   icmp_type;   // 消息类型
    unsigned char   icmp_code;   // 代码
    unsigned short icmp_checksum; // 校验和
// 下面是回显头
    unsigned short icmp_id;   // 用来惟一标识此请求的ID号，通常设置为进程ID
    unsigned short icmp_sequence; // 序列号
    unsigned long   icmp_timestamp; // 时间戳
} ICMP_HDR, *PICMP_HDR;



int SetTimeout(SOCKET s, int nTime, BOOL bRecv)
{
int ret = ::setsockopt(s, SOL_SOCKET, 
   bRecv ? SO_RCVTIMEO : SO_SNDTIMEO, (char*)&nTime, sizeof(nTime));
return ret != SOCKET_ERROR;
}

int Computer(char szDestIP[30])                   //扫描主机是否存活
{
	WSADATA wsaData;
	WORD wVersionRequested=MAKEWORD(1,1);
	if (WSAStartup(wVersionRequested , &wsaData))
	{
		printf("Winsock Initialization failed.\n");
		exit(1);
	}
	SOCKET sRaw=::socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
	SetTimeout(sRaw,1000,TRUE);
	SOCKADDR_IN dest;
	dest.sin_family=AF_INET;
	dest.sin_port=htons(0);
	dest.sin_addr.S_un.S_addr=inet_addr(szDestIP);

	char buff[sizeof(ICMP_HDR)+32];
	ICMP_HDR * pIcmp=(ICMP_HDR *)buff;

	pIcmp->icmp_type=8;
	pIcmp->icmp_code=0;
	pIcmp->icmp_id=(USHORT)::GetCurrentProcessId();
	pIcmp->icmp_checksum=0;
	pIcmp->icmp_sequence=0;

	memset(&buff[sizeof(ICMP_HDR)],'E',32);

	USHORT nSeq=0;
	char revBuf[1024];
	SOCKADDR_IN from;
	int nLen=sizeof(from);
		static int nCount=0;
		int nRet;
/*		if (nCount++==4)
		{
			break;
		}*/
		pIcmp->icmp_checksum=0;
		pIcmp->icmp_timestamp=::GetTickCount();
		pIcmp->icmp_sequence=nSeq++;
		pIcmp->icmp_checksum=checksum((USHORT *)buff,sizeof(ICMP_HDR)+32);
		nRet=::sendto(sRaw,buff,sizeof(ICMP_HDR)+32,0,(SOCKADDR *)&dest,sizeof(dest));
		if (nRet==SOCKET_ERROR)
		{
			printf("sendto() failed:%d\n",::WSAGetLastError());
			return -1;
		}
		nRet=::recvfrom(sRaw,revBuf,1024,0,(sockaddr *)&from,&nLen);
		if (nRet==SOCKET_ERROR)
		{
			printf("%s 主机没有存活！\n",szDestIP);
			return -1;
		}
		printf("%s 主机存活！\n",szDestIP);
		closesocket(nRet);
	WSACleanup();
	return 0;
}

void Port(char adr[20])               //扫描存活主机端口
{
	int mysocket,m,n;
	int pcount = 0; 
	struct sockaddr_in my_addr;
	WSADATA wsaData;
	WORD wVersionRequested=MAKEWORD(1,1);
	printf("请输入要扫描的端口范围（例如1-1024）：");
	scanf("%d-%d",&m,&n);
	if (WSAStartup(wVersionRequested , &wsaData))
	{
		printf("Winsock Initialization failed.\n");
		exit(1);
	}
	for(int i=m; i<n; i++)
	{
		if((mysocket = socket(AF_INET, SOCK_STREAM,0)) == INVALID_SOCKET)
			exit(1);
		my_addr.sin_family = AF_INET;
		my_addr.sin_port = htons(i);
		my_addr.sin_addr.s_addr = inet_addr(adr);
		if(connect(mysocket, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == SOCKET_ERROR)
		{
			printf("Port %d - 关闭\n", i);
			closesocket(mysocket);
		}
		else
		{
			pcount++;
			printf("Port %d - 打开\n", i);
		}
	}
	printf("%d ports open on host - %s\n", pcount, adr);
	closesocket(mysocket);
	WSACleanup();
}


void change(int a,int b,int c,int d,char IP[20])          //IP转换
{
	char IPPort[4][4]={'\0'};
	char temp[2]={'.','\0'};
	itoa(a,IPPort[0],10); 
	itoa(b,IPPort[1],10); 
	itoa(c,IPPort[2],10); 
	itoa(d,IPPort[3],10); 
	strcat(IP,IPPort[0]);
	strcat(IP,temp);
	strcat(IP,IPPort[1]);
	strcat(IP,temp);
	strcat(IP,IPPort[2]);
	strcat(IP,temp);
	strcat(IP,IPPort[3]);
}

void main()
{
	int a[4],b[4];
loop1:
	printf("请输入起始IP：");
	scanf("%d.%d.%d.%d",&a[0],&a[1],&a[2],&a[3]);
	if (a[0]>255||a[1]>255||a[2]>255||a[3]>255)
	{
		printf("输入的起始地址有误！请重新输入！\n");
		goto loop1;
	}
loop2:
	printf("请输入结束IP：");
	scanf("%d.%d.%d.%d",&b[0],&b[1],&b[2],&b[3]);
	if (b[0]>255||b[1]>255||b[2]>255||b[3]>255)
	{
		printf("输入的结束有误！请重新输入！\n");
		goto loop2;
	}
	while(!(a[0]==b[0]&&a[1]==b[1]&&a[2]==b[2]&&a[3]==(b[3]+1)))
	{
		char IP[20]={'\0'};
		change(a[0],a[1],a[2],a[3],IP);
		if((Computer(IP))==0)
		{
			Port(IP);
		}
		a[3]++;
		if (a[3]>=255)
		{
			a[3]=0;
			a[2]++;
		}
		if (a[2]>=255)
		{
			a[2]=0;
			a[1]++;
		}
		if (a[1]>=255)
		{
			a[1]=0;
			a[0]++;
		}
		if (a[0]>=255)
		{
			printf("地址溢出！\n");
		    break;
		}
	}

	
}

[wgd123pl]

路过，上面代码不错哦。

[程序员小迷]

用socket编程很简单

[程序员小迷]

connect不就行了

[luciferisnotsatan]

[Quote=引用 1 楼 forestdb 的回复:]

telnet ip 8080
[/Quote]
++