C写的扫描器源码

Title:C写的扫描器源码 --2010-10-27 20:02

无意间看见的一个源代码，弄回来读下。

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#include <stdio.h>
#include <winsock.h>

#define NETWORK_ERROR -1
#define NETWORK_OK 0
#define PORT_MIN 1
#define PORT_MAX 65535

HANDLE hThread;
DWORD hID;

char hostname[30];

int starting_port = 0;
int ending_port = 0;
int nopen = 0;

DWORD portscan();

int main(){
int ret;

WSADATA dat;
DWORD version;

version = MAKEWORD(2,2);

ret = WSAStartup(version,&dat);

if(ret != 0){
printf("Error initializing Winsock.\n");
WSACleanup();
return NETWORK_ERROR;
}
if(ret == 0){

printf("Enter hostname:");
scanf("%s",hostname);

printf("Enter starting port:");
scanf("%d",&starting_port);

if(starting_port < PORT_MIN){
printf("Invalid port number.\n");
WSACleanup();
return NETWORK_ERROR;
}

printf("Enter ending port:");
scanf("%d",&ending_port);

if(ending_port > PORT_MAX){
printf("Invalid port number.\n");
WSACleanup();
return NETWORK_ERROR;
}

printf("\nScanning [%s]...\n",hostname);

hThread = CreateThread(0,0,(LPTHREAD_START_ROUTINE)portscan,0,0,&hID);

if(hThread == 0){
printf("Failed to create thread.\n");
WSACleanup();
return NETWORK_ERROR;
}
sleep(-1);
}
WSACleanup();
return NETWORK_OK;
}

DWORD portscan(){
int i,nret;

SOCKET thesocket;
LPHOSTENT hostent;

thesocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
hostent = gethostbyname((hostname));

for(i = starting_port;i < ending_port+1;++i){

SOCKADDR_IN hostinfo;

hostinfo.sin_family = AF_INET;
hostinfo.sin_addr=*((LPIN_ADDR)*hostent->h_addr_list);
hostinfo.sin_port = htons(i);

nret = connect(thesocket,(LPSOCKADDR)&hostinfo,sizeof(hostinfo));

if(nret == 0){
printf("\n\t%d\n",i);
++nopen;
}
}

printf("\nScan complete.\n\n");
printf("Number of ports opened = %d\n",nopen);

closesocket(thesocket);
}

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