为什么我写的端口扫描器扫描所有端口都是打开的呢

[ggg82]

最近刚开始学习网络编程，自己写了一个扫描器，使用connect连接测试，可是，我发现，除了我自己的机器，其他的机器所有端口都是打开的，为什么呢

[keikey_xi]

不会吧,你的程序一定是写错了,贴出来看看.

[ggg82]

/********************************************/
/* 端口扫描器 源代码 */
/* PortScanner.c */
/********************************************/

#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <winsock2.h>
#include <windows.h>
#include <commctrl.h>
/*功能定义：对某个IP段进行端口扫描
*参数定义：共4个参数
* 开始地址,结束地址,开始端口,结束端口
* 无开始地址,默认开始地址==0.0.0.0
* 无结束地址,默认结束地址==开始地址
* 无开始端口,默认开始端口==0
* 无结束端口,默认结束端口==开始端口
*参数形式：Scan /h <开始地址> [结束地址] /p <开始端口> [结束端口]
*/
extern int OutCode_PortScan(FILE *fpout);
void Help(char *app)
{
fprintf(stderr,"This program will scan host port!\n");
fprintf(stderr,"Usage: %s /h <start host [end host]> /p <start port [end port]
>\n", app);
fprintf(stderr,"Press any key to show itself\'s C source and exit this program
!\n");
getch();
OutCode_PortScan(NULL);
}
#define HOST_PARAM 1
#define PORT_PARAM 2
#define BAD_PARAM 0
#define IPTOLONG(addr) MAKEIPADDRESS(FOURTH_IPADDRESS(addr),THIRD_IPADDRESS(a
ddr),SECOND_IPADDRESS(addr),FIRST_IPADDRESS(addr))
#define LONGTOIP(addr) MAKEIPADDRESS(FOURTH_IPADDRESS(addr),THIRD_IPADDRESS(a
ddr),SECOND_IPADDRESS(addr),FIRST_IPADDRESS(addr))
FILE *fp=NULL;
void closefile()
{
if(fp)
fclose(fp);
}
int main(int argc, char *argv[])
{
WSADATA wsaData;
WORD wVersionRequested=MAKEWORD(1,1);
int startHost,endHost;
int startPort,endPort;
char *p;
int i,n=BAD_PARAM;

int mysocket=0;
int pcount = 0;
struct sockaddr_in my_addr;
struct in_addr inaddr;
if(argc < 5) //至少5个参数，最多7个
{
Help(argv[0]);
exit(1);
}
//分析参数
i=1;
while(i<argc)
{
p=argv[i++];
if(*p=='/')
{

switch(*++p)
{
case 'h':
case 'H':
n=HOST_PARAM;
startHost=inet_addr(argv[i++]);
endHost=startHost=IPTOLONG(startHost);
continue;
case 'p':
case 'P':
n=PORT_PARAM;
endPort=startPort=atoi(argv[i++]);
continue;
default:
n=BAD_PARAM;
break;
}//end switch p
}//end if *p
//根据状态复制数据
switch(n)
{
case HOST_PARAM:
endHost=inet_addr(p);
endHost=IPTOLONG(endHost);
break;
case PORT_PARAM:
endPort=atoi(p);
break;
default://出现错误
Help(argv[0]);
exit(1);
}//end switch n
}//end while
//参数正确，开始调试数据
//调整顺序
if(startHost>endHost)
{
n=endHost;
endHost=startHost;
startHost=n;
}
if(startPort>endPort)
{
n=endPort;
endPort=startPort;
startPort=n;
}
if (WSAStartup(wVersionRequested , &wsaData))
{
printf("Winsock Initialization failed.\n");
exit(1);
}
//打开记录文件
fp=fopen("PortScan.txt","w");
atexit(closefile);
//循环主机
for(n=startHost;n<=endHost;n++)
{
inaddr.S_un.S_addr=LONGTOIP(n);
printf("\rScaning host [%s]\n",inet_ntoa(inaddr));
if(fp)
fprintf(fp,"Scaning host [%s]\n",inet_ntoa(inaddr));
pcount=0;
//循环端口
for(i=startPort; i <=endPort; i++)
{
int timeout=100;
if((mysocket = socket(AF_INET, SOCK_STREAM,0)) == INVALID_SOCKET)
{
printf("\rCannot Open Host [%s]\n",inet_ntoa(inaddr));
if(fp)
fprintf(fp,"Cannot Open Host [%s]\n",inet_ntoa(inaddr));
break;//跳出循环，进行下一次扫描
}
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons((unsigned short)i);
my_addr.sin_addr = inaddr;
//setsockopt(mysocket,SOL_SOCKET,TCP_NODELAY,(char*)&timeout,sizeof(timeou
t));
printf("\rScaning %d",i);
if(connect(mysocket, (struct sockaddr *)&my_addr, sizeof(struct sockaddr))
== SOCKET_ERROR)
{
closesocket(mysocket);
}
else
{
pcount++;
printf("\rPort %d - open\n", i);
if(fp)
fprintf(fp,"Port %d - open\n", i);
}
}
if(INVALID_SOCKET!=mysocket)
{
//printf("\x0d%d ports opened on host [%s]\n",pcount,inet_ntoa(inaddr));
closesocket(mysocket);
}
}

WSACleanup();
return 0;
}

[ggg82]

大虾看看，为什么呢

[wjf666]

UP

[cryptonym]

概念型错误啊。


对tcp的编程过程还认识不清楚。你看看tcp的简单例子吧。

[ggg82]

可是，我对自己机器（127.0.0.1）扫描，结果正确呀，而且，我暂时还看不出错误之处，大虾指点呀！！

[newman0708]

if(connect(mysocket, (struct sockaddr *)&my_addr, sizeof(struct sockaddr))
== SOCKET_ERROR)｛
连接不能，端口为关
｝
else{
连接成功，端口为开
}

closesocket