C端口扫描



#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);
return 0;
}


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