3个回答
2015-07-17
展开全部
#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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