发现网络中的活动主机

【文件属性】：
文件名称：发现网络中的活动主机
文件大小：6KB
文件格式：CPP
更新时间：2012-01-11 07:39:43
C程序 #pragma pack(4) //#include "stdafx.h" #pragma comment (lib,"Ws2_32.lib") #define WIN32_LEAN_AND_MEAN #include #include #include #include #include #include #include typedef struct iphdr { unsigned int headlen:4; unsigned int version:4; unsigned char tos; unsigned short totallen; unsigned short id; unsigned short falg; unsigned char ttl; unsigned char prot; unsigned short checksum; unsigned int sourceIP; unsigned int destIP; }IpHeader; typedef struct icmphdr { BYTE type; BYTE code; USHORT checksum; USHORT id; USHORT seg; }IcmpHeader; #define ICMP_RCHO 8 #define ICMP_RCHO_REPLY 0 #define ICMP_MIN 8 #define STATUS_FAILED 0xFFFF #define DEF_PACKET_SIZE 32 #define MAX_PACKET 1024 #define MAX_PING_PACKET_SIZE (MAX_PACKET+sizeof(IpHeader)) void fill_icmp_data(char *,int); USHORT checksum(USHORT *,int); void decode_resp(char *,int,struct sockaddr_in *); DWORD WINAPI FindIP(LPVOID pIPAddrTemp); WSADATA wsaData; SOCKET sockRaw; struct sockaddr_in dest,from,end; int fromlen =sizeof(from); char *recvbuf=new char[MAX_PING_PACKET_SIZE]; unsigned int addr=0; long ThreadNumCounter=0,ThreadNumLimit=20; long *aa=&ThreadNumCounter; void main(int argc,char *argv[]) { /*if(argc!=3) { cout<<"输入格式错误: start_ip end_ip"<ThreadNumLimit) { Sleep(5000); continue; } DWORD ThreadID; sockaddr_in *pIPAddrTemp=new (sockaddr_in); if(!pIPAddrTemp) { cout<<"memory alloc failed"<type=ICMP_RCHO; icmp_hdr->id=(USHORT)GetCurrentThreadId(); datapart=icmp_data+sizeof(IcmpHeader); memset(datapart,'A',datasize-sizeof(IcmpHeader)); } void decode_resp(char *buf,int bytes,struct sockaddr_in *from) { IpHeader *iphdr; IcmpHeader *icmphdr; unsigned short iphdrlen; iphdr=(IpHeader*) buf; iphdrlen=iphdr->headlen*4; icmphdr=(IcmpHeader *)(buf+iphdrlen); if(bytestype!=ICMP_RCHO_REPLY)return; if(icmphdr->id!=(USHORT)GetCurrentThreadId())return; cout<<"活动主机: "<sin_addr)<1) { cksum+=*buffer++; size-=sizeof(USHORT); } if(size) { cksum+=*(UCHAR*)buffer; } cksum=(cksum>>16)+(cksum& 0xffff); cksum+=(cksum>>16); return (USHORT)(~cksum); } DWORD WINAPI FindIP(LPVOID pIPAddrTemp) { InterlockedIncrement(aa); char icmp_data[MAX_PACKET]; memset(icmp_data,0,MAX_PACKET); int datasize=DEF_PACKET_SIZE; datasize+=sizeof(IcmpHeader); fill_icmp_data(icmp_data,datasize); ((IcmpHeader*)icmp_data)->checksum=0; ((IcmpHeader*)icmp_data)->seg=0; ((IcmpHeader*)icmp_data)->checksum=checksum((USHORT*)icmp_data,datasize); int bwrote=sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr *)pIPAddrTemp,sizeof(dest)); int n=0; if(bwrote==SOCKET_ERROR) { if(WSAGetLastError()==WSAETIMEDOUT) { cout<<"timed out"<