PING实验报告.doc

icmpping 20120428 23 _pingping123pingwindowsping.ping *.*.*.*ip4reply from *.*.*.*request timeout ping1pingping pingping icmpicmpicmpicmpicmpipipicmp()ipicmpipicmp8bit8bit16bit 16biticmppingicmp0icmp8icmppingiptcp/ip, ip(ip datagram). , , ip.icmptcp/ipicmp(internet control message protocol), : echoecho replyping icmp2rawsocketpingicmpipipicmprawsocketsocketsocketbind.31 ipicmp2 windowsping. 1 ipicmp2 rawsocket3ping4socket ws2_32.lib5 ping61ipicmpipicmp/iptypedef struct iphdr unsigned int h_len : 4 ; /unsigned int version : 4 ; /unsigned char tos ; /unsigned short total_len ; /unsigned short ident ; /unsigned short frag_and_flags ; /unsigned char ttl ; /unsigned char proto ; /unsigned short checksum ;/ unsigned int sourceip ;/ ipunsigned int destip ;/ ip;/icmptypedef struct icmphdrbyte i_type ; /byte i_code ; /ushort i_cksum ; /ushort i_id ; /ushort i_seq ; /ulong timestamp ; /;2.wsadata wsadata ;socket sockraw ;struct sockaddr_in dest,from ;struct hostent*hp ;int bread,datasize=32,packnum=6;int fromlen=sizeof(from);int timeout=1000 ;int statistic=0 ;int ts=0;char*dest_ip ;char*icmp_data ;char*recvbuf ;unsigned int addr=0 ;ushort seq_no=0 ;int temp;31void fill_icmp_data(char*icmp_data,int datasize,int ts); /icmpvoid fill_icmp_data(char*icmp_data,int datasize,int ts)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 ;icmp_hdr->timestamp=ts;datapart=icmp_data+sizeof(icmpheader);memset(datapart,e,datasize-sizeof(icmpheader);2ushort checksum(ushort*buffer,int size);/icmpushort checksum(ushort*buffer,int size)unsigned long cksum=0 ;while(size>1)cksum+=*buffer+;size-=sizeof(ushort);if(size)cksum+=*(uchar*)buffer ;cksum=(cksum>>16)+(cksum&0xffff);cksum+=(cksum>>16);return(ushort)(cksum);3int decode_resp(char*buf,int bytes,struct sockaddr_in*from); /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 ;if(bytes<iphdrlen+icmp_min)cout<<too few bytes from <<inet_ntoa(from->sin_addr)<<endl; pingwindows ping 2013627 11.1 11.2 1 12.1 rawsocket12.2 2 23.1 ping 23.2 53.3 6 84.184.294.3134.4 ping14 155.1165.2161. 1pingpingicmpicmpicmpipicmpip1. 2 c ping1pingpingicmp2-r3-n4datasize52.1 rawsocketpingicmpipipicmprawsocketicmptcp/ipipipicmppingicmpicmp icmpwindows xpinterneticmpsocketsocketbindlisten2. 22.2.1ipicmp3-iphdr-icmphdr-ipotionhdripicm pip2.2.2windowsping2.2.3ping .ip4reply from .request timeout ping3.1 pingping()socketicmpicmpicmp ping3.112ping12 windows pingping192.168.31.1273 arp /a arp arp /d (arp /a)arp/ano arp entries foundping iparp /sip arp /sipmacpingpingpingpingicmpicmpicmpipicmpippingpingtcp/ip1rawsocketpingicmpipipicmprawsocketsocketsocketbind3. 4. 1ipicmp5. 2windowsping6. 3ping .ip4reply from .request timeout ping.3.1 4 ping.3.1.1 3.1.23.1.33.1.47. 22.2iniping()getargments()(user help )pingpingpingping2.2 8. 3getargments()-r-ndatasize()-r-nr-r ipdatasize, datasize ip9. 4ping()ping()icmpicmpicmpicmp3-iphdr-icmphdr-ipotionhdripicm pip10. 1iptypedef struct _iphdrunsigned int h_len:4;unsigned int version:4;unsigned char tos;unsigned short total_len;unsigned short ident;unsigned short frag_flags;unsigned char ttl;unsigned chor proto;unsigned short checksum;unsigned int sourceip;unsigned int destip; ipheader;h-len:4 : ip32bit4bit 60ip20version:4: ipipv4.top: total Clen: ipident: frag-flags: ttl: proto: tcpudpchecksum: sourceip: ipdestip: ip11. 2typedef struct Cicmphdrbyte i_type;byte i_code :ushort i_cksum;ushort i_id;ushort i_seq;ulong timestamp; icmpheader;i_