文件名称:网络编程之PING实现
文件大小:79KB
文件格式:RAR
更新时间:2012-11-29 16:17:39
ping // ping.cpp : Defines the entry point for the console application. // #pragma pack(4) #include "winsock2.h" #include "stdlib.h" #include "stdio.h" #define ICMP_ECHO 8 #define ICMP_ECHOREPLY 0 #define ICMP_MIN 8 // minimum 8 byte icmp packet (just header) /* The IP header */ typedef struct iphdr { unsigned int h_len:4; // length of the header unsigned int version:4; // Version of IP unsigned char tos; // Type of service unsigned short total_len; // total length of the packet unsigned short ident; // unique identifier unsigned short frag_and_flags; // flags unsigned char ttl; unsigned char proto; // protocol (TCP, UDP etc) unsigned short checksum; // IP checksum unsigned int sourceIP; unsigned int destIP; }IpHeader; // // ICMP header // typedef struct icmphdr { BYTE i_type; BYTE i_code; /* type sub code */ USHORT i_cksum; USHORT i_id; USHORT i_seq; /* This is not the std header, but we reserve space for time */ ULONG timestamp; }IcmpHeader; #define STATUS_FAILED 0xFFFF #define DEF_PACKET_SIZE 32 #define DEF_PACKET_NUMBER 4 /* 发送数据报的个数 */ #define MAX_PACKET 1024 #define xmalloc(s) HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,(s)) #define xfree(p) HeapFree (GetProcessHeap(),0,(p)) void fill_icmp_data(char *, int); USHORT checksum(USHORT *, int); int decode_resp(char *,int ,struct sockaddr_in *); void Usage(char *progname){ fprintf(stderr,"Usage:\n"); fprintf(stderr,"%s [number of packets] [data_size]\n",progname); fprintf(stderr,"datasize can be up to 1Kb\n"); ExitProcess(STATUS_FAILED); } int main(int argc, char **argv){ WSADATA wsaData; SOCKET sockRaw; struct sockaddr_in dest,from; struct hostent * hp; int bread,datasize,times; int fromlen = sizeof(from); int timeout = 1000; int statistic = 0; /* 用于统计结果 */ char *dest_ip; char *icmp_data; char *recvbuf; unsigned int addr=0; USHORT seq_no = 0; if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){ fprintf(stderr,"WSAStartup failed: %d\n",GetLastError()); ExitProcess(STATUS_FAILED); } if (argc <2 ) { Usage(argv[0]); } sockRaw = WSASocket(AF_INET,SOCK_RAW,IPPROTO_ICMP,NULL, 0,WSA_FLAG_OVERLAPPED); // //注:为了使用发送接收超时设置(即设置SO_RCVTIMEO, SO_SNDTIMEO), // 必须将标志位设为WSA_FLAG_OVERLAPPED ! // if (sockRaw == INVALID_SOCKET) { fprintf(stderr,"WSASocket() failed: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } bread = setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout, sizeof(timeout)); if(bread == SOCKET_ERROR) { fprintf(stderr,"failed to set recv timeout: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } timeout = 1000; bread = setsockopt(sockRaw,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout, sizeof(timeout)); if(bread == SOCKET_ERROR) { fprintf(stderr,"failed to set send timeout: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } memset(&dest,0,sizeof(dest)); hp = gethostbyname(argv[1]); if (!hp){ addr = inet_addr(argv[1]); } if ((!hp) && (addr == INADDR_NONE) ) { fprintf(stderr,"Unable to resolve %s\n",argv[1]); ExitProcess(STATUS_FAILED); } if (hp != NULL) memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length); else dest.sin_addr.s_addr = addr; if (hp) dest.sin_family = hp->h_addrtype; else dest.sin_family = AF_INET; dest_ip = inet_ntoa(dest.sin_addr); // // atoi函数原型是: int atoi( const char *string ); // The return value is 0 if the input cannot be converted to an integer ! // if(argc>2) { times=atoi(argv[2]); if(times == 0) times=DEF_PACKET_NUMBER; } else times=DEF_PACKET_NUMBER; if (argc >3) { datasize = atoi(argv[3]); if (datasize == 0) datasize = DEF_PACKET_SIZE; if (datasize >1024) /* 用户给出的数据包大小太大 */ { fprintf(stderr,"WARNING : data_size is too large !\n"); datasize = DEF_PACKET_SIZE; } } else datasize = DEF_PACKET_SIZE; datasize += sizeof(IcmpHeader); icmp_data = (char*)xmalloc(MAX_PACKET); recvbuf = (char*)xmalloc(MAX_PACKET); if (!icmp_data) { fprintf(stderr,"HeapAlloc failed %d\n",GetLastError()); ExitProcess(STATUS_FAILED); } memset(icmp_data,0,MAX_PACKET); fill_icmp_data(icmp_data,datasize); // //显示提示信息 // fprintf(stdout,"\nPinging %s ....\n\n",dest_ip); for(int i=0;i
【文件预览】:
ping
----StdAfx.cpp(291B)
----ping.dsp(4KB)
----Debug()
--------vc60.pdb(52KB)
--------vc60.idb(153KB)
--------ping.pch(187KB)
--------StdAfx.obj(2KB)
----ReadMe.txt(1KB)
----StdAfx.h(667B)
----ping.cpp(7KB)
----ping.ncb(33KB)
----ping.opt(48KB)
----ping.dsw(533B)
----ping.plg(2KB)