计算机网络课程设计(第七章)解析IP数据包(完整程序代码)(共8页).docx

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1、精选优质文档-倾情为你奉上计算机网络课程设计机械工业出版社第7章：解析IP数据包课程设计目的：本课程设计的目的就是设计一个解析IP数据包的程序，并根据这个程序，说明IP数据包的结构及IP协议的相关问题，从而对IP层的工作原理有更好的理解和认识。完整程序代码：#include#include#include#pragma comment(lib,ws2_32.lib) typedef struct _IP_HEADER unionBYTE Version;BYTE HdrLen;BYTE ServiceType;WORD TotalLen;WORD ID;unionWORD Flags;WORD

2、 FragOff;BYTE TimeToLive;BYTE Protocol;WORD HdrChksum;DWORD SrcAddr;DWORD DstAddr;BYTE Options; IP_HEADER;#define IO_RCVALL _WSAIOW(IOC_VENDOR,1)#define BUFFER_SIZE 65535void getVersion(BYTE b,BYTE &version)version=b4; void getIHL(BYTE b,BYTE &length)length=(b&0x0f)*4;char* parseServiceType_getProce

3、dence(BYTE b)switch(b5)case 7: return Network Control;break;case 6:return internet work Control;break;case 5:return CRITIC/ECP;break;case 4:return Flash Override;break;case 3:return Flash;break;case 2:return Immediate;break;case 1:return Priority;break;case 0:return Routine;break;default:return Unkn

4、own;char* parseServiceType_getTOS(BYTEb)b=(b1)&0x0f;switch(b)case 0:return Normal Service;break;case 1:return Minimize monetary cost;break;case 2:return Maximize reliability;break;case 4:return Maximize throughput;break;case 8:return Minimize delay;break;case 15:return Maximize security;break;defaul

5、t:return Unknown;void getFlags(WORD w,BYTE &DF,BYTE &MF)DF=(w14)&0x01;MF=(w13)&0x01;void getFragOff(WORD w,WORD &fragOff)fragOff=w&0x1fff;char* getProtocol(BYTE Protocol)switch (Protocol)case 1:return ICMP;case 2:return IGMP;case 4:return IP in IP;case 6:return TCP;case 8:return EGP;case 17:return U

6、DP;case 41:return IPv6;case 46:return RSVP;case 89:return OSPF;default:return UNKNOWN;void ipparse(FILE* file,char* buffer)IP_HEADER ip=*(IP_HEADER*)buffer;fseek(file,0,SEEK_END);fprintf(file,-n);BYTE version;getVersion(ip.Version,version);fprintf(file,Version:%dn,version);BYTE headerLen;getIHL(ip.H

7、drLen,headerLen);fprintf(file,HdrLen:%d(Bytes)n,headerLen);fprintf(file,ServiceType: %s,%sn,parseServiceType_getProcedence(ip.ServiceType),parseServiceType_getTOS(ip.ServiceType);fprintf(file,TotalLen: %d(Bytes)n,ip.TotalLen);fprintf(file,ID: %dn,ip.ID);BYTE DF,MF;getFlags(ip.Flags,DF,MF);fprintf(fi

8、le,Flags:DF=%d,MF=%dn,DF,MF);WORD fragOff;getFragOff(ip.FragOff,fragOff);fprintf(file,FragOff: %dn,fragOff);fprintf(file,FragOff: %dn,fragOff);fprintf(file,TimeToLive: %d(Hops)n,ip.TimeToLive);fprintf(file,Protocol: %sn,getProtocol(ip.Protocol);fprintf(file,HdrChksum: 0x%0xn,ip.HdrChksum);fprintf(fi

9、le,SrcAddr: %sn,inet_ntoa(*(in_addr*)&ip.SrcAddr);fprintf(file,DstAddr: %sn,inet_ntoa(*(in_addr*)&ip.DstAddr);void main(int argc,char*argv)if(argc!=2)printf(Please input command: ParseArp output_file);return;FILE* file; if(file=fopen(argv1,wb+)=NULL)printf(Fail to open file %s,argv1);return;WSADATA

10、wsData;if(WSAStartup(MAKEWORD(2,2),&wsData)!=0)printf(WSAStartup failed!);return;SOCKET sock;if(sock=socket(AF_INET,SOCK_RAW,IPPROTO_IP)=INVALID_SOCKET)printf(Creat socket failed);return;BOOL flag=true;if(setsockopt(sock,IPPROTO_IP,IP_HDRINCL,(char*)&flag,sizeof(flag)=SOCKET_ERROR)printf(Setsockopt

11、failed!);return;char hostName128;if(gethostname(hostName,100)=SOCKET_ERROR)printf(Gethostname failed!);return;hostent* pHostIP;if(pHostIP=gethostbyname(hostName)=NULL)printf(Gethostbyname failed!);return;sockaddr_in addr_in;addr_in.sin_addr=*(in_addr*)pHostIP-h_addr_list0;addr_in.sin_family=AF_INET;

12、addr_in.sin_port=htons(6000);if(bind(sock,(PSOCKADDR)&addr_in,sizeof(addr_in)=SOCKET_ERROR)printf(Bind failed!);return;DWORD dwValue=1;DWORD dwBufferLen10;DWORD dwBufferInLen=1;DWORD dwBytesReturned=0;if(WSAIoctl(sock,IO_RCVALL,&dwBufferInLen,sizeof(dwBufferInLen),&dwBufferLen,sizeof(dwBufferLen),&dwBytesReturned,NULL,NULL)=SOCKET_ERROR)printf(Ioctlsocket failed!);return;char bufferBUFFER_SIZE;printf(Listening on local host.n);while(true)int size=recv(sock,buffer,BUFFER_SIZE,0);if(size0)ipparse(stdout,buffer);ipparse(file,buffer);fclose(file);return;结果截图专心-专注-专业