一个C语言写的端口扫描程序代码

2009-9-6 12:26 846 0

摘要: #include <stdio.h>#include <winsock.h>#define NETWORK_ERROR -1#define NETWORK_OK 0#defin...

关键词： printf PORT NETWORK starting hostname WSACleanup thesocket ERROR return define

#include <stdio.h>#include <winsock.h>#define NETWORK_ERROR -1#define NETWORK_OK 0#define PORT_MIN 1#define PORT_MAX 65535HANDLE 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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