下载了模板如何做网站,成都网站制作汕头,wordpress中,网站建设 中国移动作者:侯志江 单位:天津大学软件学院 E-mail :tjuhzjemailyahoo.com.cn 日期:2005年1月1日 内容简介: 编写自己的一个ping程序,可以说是许多人迈出网络编程的第一步吧!!这个ping程序的源代码经过我的修改和调试,基本上可以取代windows中自带的ping程序. 各个模块…作者:侯志江 单位:天津大学软件学院 E-mail :tjuhzjemailyahoo.com.cn 日期:2005年1月1日 内容简介: 编写自己的一个ping程序,可以说是许多人迈出网络编程的第一步吧!!这个ping程序的源代码经过我的修改和调试,基本上可以取代windows中自带的ping程序. 各个模块后都有我的详细注释和修改日志,希望能够对大家的学习有所帮助!! /* 本程序的主要源代码来自MSDN网站, 笔者只是做了一些改进和注释! 另外需要注意的是在Build之前,必须加入ws2_32.lib库文件,否则会提示error LNK2001:的错误*/ Version 1.1 修改记录: 1 解决了socket阻塞的问题,从而能够正确地处理超时的请求! 2 增加了由用户控制发送ICMP包的数目的功能(即命令的第二个参数) 3 增加了对ping结果的统计功能. #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 addr0; 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(argc2){timesatoi(argv[2]);if(times 0) timesDEF_PACKET_NUMBER;}else timesDEF_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 i0;i{ int bwrote; ((IcmpHeader*)icmp_data)-i_cksum 0; ((IcmpHeader*)icmp_data)-timestamp GetTickCount(); ((IcmpHeader*)icmp_data)-i_seq seq_no; ((IcmpHeader*)icmp_data)-i_cksum checksum((USHORT*)icmp_data,datasize);bwrote sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr*)dest,sizeof(dest)); if (bwrote SOCKET_ERROR){ if (WSAGetLastError() WSAETIMEDOUT) { printf(Request timed out.\n); continue; } fprintf(stderr,sendto failed: %d\n,WSAGetLastError()); ExitProcess(STATUS_FAILED); } if (bwrote datasize ) { fprintf(stdout,Wrote %d bytes\n,bwrote); } bread recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)from,fromlen); if (bread SOCKET_ERROR){ if (WSAGetLastError() WSAETIMEDOUT) { printf(Request timed out.\n); continue; } fprintf(stderr,recvfrom failed: %d\n,WSAGetLastError()); ExitProcess(STATUS_FAILED); } if(!decode_resp(recvbuf,bread,from))statistic; /* 成功接收的数目 */Sleep(1000); } /*Display the statistic result*/fprintf(stdout,\nPing statistics for %s \n,dest_ip);fprintf(stdout, Packets: Sent %d,Received %d, Lost %d (%2.0f%% loss)\n,times, statistic,(times-statistic),(float)(times-statistic)/times*100); WSACleanup();return 0; } /* The response is an IP packet. We must decode the IP header to locate the ICMP data */ int decode_resp(char *buf, int bytes,struct sockaddr_in *from) { IpHeader *iphdr; IcmpHeader *icmphdr; unsigned short iphdrlen; iphdr (IpHeader *)buf; iphdrlen (iphdr-h_len) * 4 ; // number of 32-bit words *4 bytes if (bytes iphdrlen ICMP_MIN) { printf(Too few bytes from %s\n,inet_ntoa(from-sin_addr)); } icmphdr (IcmpHeader*)(buf iphdrlen); if (icmphdr-i_type ! ICMP_ECHOREPLY) { fprintf(stderr,non-echo type %d recvd\n,icmphdr-i_type); return 1; } if (icmphdr-i_id ! (USHORT)GetCurrentProcessId()) { fprintf(stderr,someone elses packet!\n); return 1; } printf(%d bytes from %s:,bytes, inet_ntoa(from-sin_addr)); printf( icmp_seq %d. ,icmphdr-i_seq); printf( time: %d ms ,GetTickCount()-icmphdr-timestamp); printf(\n);return 0; } USHORT checksum(USHORT *buffer, int size) { unsigned long cksum0; while(size 1) { cksum*buffer; size -sizeof(USHORT); } if(size) { cksum *(UCHAR*)buffer; } cksum (cksum 16) (cksum 0xffff); cksum (cksum 16); return (USHORT)(~cksum); } /* Helper function to fill in various stuff in our ICMP request. */ void fill_icmp_data(char * icmp_data, int datasize){ IcmpHeader *icmp_hdr; char *datapart; icmp_hdr (IcmpHeader*)icmp_data; icmp_hdr-i_type ICMP_ECHO; icmp_hdr-i_code 0; icmp_hdr-i_id (USHORT)GetCurrentProcessId(); icmp_hdr-i_cksum 0; icmp_hdr-i_seq 0; datapart icmp_data sizeof(IcmpHeader); // // Place some junk in the buffer. // memset(datapart,E, datasize - sizeof(IcmpHeader)); } /******************* 附: ping命令执行时显示的画面 ****************\* C:\Documents and settings\houzhijiangping 236.56.54.12 * * ** Pinging 236.56.54.12 with 32 bytes of data: ** * * Request timed out. ** Request timed out. ** Request timed out. ** Request timed out. * * ** Ping statistics for 236.56.54.12: ** Packets: Sent 4, Received 0, Lost 4 (100% loss), ** *\**************************************************************//**************************************************************\* C:\Documents and Settings\houzhijiangping 127.0.0.1 ** ** Pinging 127.0.0.1 with 32 bytes of data: ** ** Reply from 127.0.0.1: bytes32 time1ms TTL128 ** Reply from 127.0.0.1: bytes32 time1ms TTL128 ** Reply from 127.0.0.1: bytes32 time1ms TTL128 ** Reply from 127.0.0.1: bytes32 time1ms TTL128 ** ** Ping statistics for 127.0.0.1: ** Packets: Sent 4, Received 4, Lost 0 (0% loss), ** Approximate round trip times in milli-seconds: ** Minimum 0ms, Maximum 0ms, Average 0ms ** *\**************************************************************/转载于:https://www.cnblogs.com/spinsoft/archive/2012/04/07/2435728.html
