计算机网络课程设计解析IP数据包完整程序代码

1、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<stdio.h>#include<winsock2.h>#include<ws2tcpip.h>#pragma comment(lib,"ws2_32.lib") typedef struct _IP_HEADER unionBYTE Version;BYTE HdrLen;BYTE Serv

2、iceType;WORD TotalLen;WORD ID;unionWORD Flags;WORD 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=b>>4; void getIHL(BYTE b,

3、BYTE &length)length=(b&0x0f)*4;char* parseServiceType_getProcedence(BYTE b)switch(b>>5)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:ret

4、urn "Flash"break;case 2:return "Immediate"break;case 1:return "Priority"break;case 0:return "Routine"break;default:return "Unknown"char* parseServiceType_getTOS(BYTEb)b=(b>>1)&0x0f;switch(b)case 0:return "Normal Service"break;case

5、 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;default:return "Unknown"void getFlags(WOR

6、D w,BYTE &DF,BYTE &MF)DF=(w>>14)&0x01;MF=(w>>13)&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

7、 "TCP"case 8:return "EGP"case 17:return "UDP"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);fprin

8、tf(file,"-n");BYTE version;getVersion(ip.Version,version);fprintf(file,"Version:%dn",version);BYTE headerLen;getIHL(ip.HdrLen,headerLen);fprintf(file,"HdrLen:%d(Bytes)n",headerLen);fprintf(file,"ServiceType: %s,%sn",parseServiceType_getProcedence(ip.ServiceTyp

9、e),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(file,"Flags:DF=%d,MF=%dn",DF,MF);WORD fragOff;getFragOff(ip.FragOff,fragOff);fprintf(file,"FragOff:

10、 %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(file,"SrcAddr: %sn",inet_ntoa(*(

11、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&

12、quot;,argv1);return;WSADATA 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,(

13、char*)&flag,sizeof(flag)=SOCKET_ERROR)printf("Setsockopt 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;

14、sockaddr_in addr_in;addr_in.sin_addr=*(in_addr*)pHostIP->h_addr_list0;addr_in.sin_family=AF_INET;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("Ioctls