为什么我写的端口扫描器扫描所有端口都是打开的呢 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 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 /********************************************//* 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(addr),SECOND_IPADDRESS(addr),FIRST_IPADDRESS(addr))#define LONGTOIP(addr) MAKEIPADDRESS(FOURTH_IPADDRESS(addr),THIRD_IPADDRESS(addr),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(timeout)); 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;} 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。 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 一屏能放下多少行代码? 请问高手,如何用VC编一个网页登录程序? 请问一个CString 方法 C++学到什么程度 可以尝试学习VC 并做一些开发了? 如何得到Edit控件中字符?------急!在线等候(立即给分) 全局窗口类对象定义问题 请问怎么编程实现凭保? 怎么获得对话框的HWND? 已获窗口指针,想在这个窗口中找到EDIT BOX控件的指针,如何实现? 用内存兼容DC来绘制透明位图时出现无规律的闪烁现象,可能是什么原因? 请教一个CBitmap绘图问题 宏问题!!
/* 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;
}
对tcp的编程过程还认识不清楚。你看看tcp的简单例子吧。
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