计算机网络课程设计(第五章)发送ARP数据包(完整程序代码).doc

计算机网络课程设计
——机械工业出版社
第5章：发送ARP数据包
课程设计目的：
ARP协议用于完成IP地址与MAC 地址之间的转换。熟悉ARP协议对于IP数据包的传送过程具有重要意义。本课程设计的主要目的是通过封装与发送ARP帧，了解ARP协议的工作原理与ARP帧的结构。

完整程序代码：

#include<iostream.h>
#include<pcap.h>
#pragma comment(lib,"wpcap.lib")
#pragma comment(lib,"ws2_32.lib")

typedef struct PhyFrame
{
unsigned char DstMAC[6];
unsigned char SrcMAC[6];
unsigned short FrameType;
}PHYFRAME;

typedef struct ArpFrame
{
unsigned short HardwareType;
unsigned short ProtocolType;
unsigned char MACLen;
unsigned char IPLen;
unsigned short Flag;
unsigned char SrcMAC[6];
unsigned char SrcIP[4];
unsigned char DstMAC[6];
unsigned char DstIP[4];
unsigned char Padding[18];
}ARPFRAME;

typedef struct ArpPacket
{
PHYFRAME phyFrame;
ARPFRAME arpFrame;
}*ARPPACKET;

ArpPacket arpPacket;

int CheckMAC(char *argv,unsigned char *mac_addr)
{
char mac[18];
int i=0,j=0,k=0;
strcpy(mac,argv);
int m=strlen(argv);
for(i=0;i<m;i++)
{
if(mac[i]<'-'||(mac[i]>'-'&&mac[i]<'0')||(mac[i]>'9'&&mac[i]<'A')||(mac[i]>'Z'&&mac[i]<'a')||mac[i]>'z')

{

cout<<"mac address error"<<endl;
return 0;

}

else
{
if(mac[i]!='-')
j++;
else

{

k++;
if(j>2)
{
cout<<"mac address errot"<<endl;
return 0;

}
else
j=0;
if(k>5)
{
cout<<"mac address error"<<endl;
return 0;

}

}
}
}

for(i=0;i<6;i++)
{
while(*(mac+j)=='-')
j++;
if(*(mac+j)>='0'&&*(mac+j)<='9')
mac_addr[i]=(unsigned char)(*(mac+j)-'0');
if(*(mac+j)>='a'&&*(mac+j)<='z')
mac_addr[i]=(unsigned char)(*(mac+j)-'a'+10);
if(*(mac+j)>='A'&&*(mac+j)<='Z')
mac_addr[i]=(unsigned char)(*(mac+j)-'A'+10);
j++;
mac_addr[i]*=16;
if(*(mac+j)>='0'&&*(mac+j)<='9')
mac_addr[i]+=(unsigned char)(*(mac+j)-'0');

if(*(mac+j)>='a'&&*(mac+j)<='z')
mac_addr[i]+=(unsigned char)(*(mac+j)-'a'+10);
if(*(mac+j)>='A'&&*(mac+j)<='Z')
mac_addr[i]+=(unsigned char)(*(mac+j)-'A'+10);
j++;
}
return 1;

}
int CheckIP(char *argv,unsigned char *ip_addr)
{
char ip[16];
int i=0,j=0,k=0;
strcpy(ip,argv);
int m=strlen(argv);

for(i=0;i<m;i++)
{
if(ip[i]<'.'||(ip[i]>'.'&&ip[i]<'0')||ip[i]>'9')
{
cout<<"IP address error!"<<endl;
return 0;

}
else
{
if(ip[i]!='.')
j++;
else
{
k++;
if(j>3)
{
cout<<"IP address error!"<<endl;
return 0;
}
else
j=0;
if(k>3)
{
cout<<"IP address error!"<<endl;
return 0;
}
}
}
}

for(i=0;i<4;i++)
{
while(*(ip+j)=='.')
j++;
ip_addr[i]=(unsigned char)atoi(ip+j);
}
return 1;
}

void main(int argc,char *argv[])
{
if(argc!=5)
{
cout<<"please input command: SendArp source_ip source_mac dest_ip dest_mac"<<endl;
return;
}

int i=0;
memset(&arpPacket,0,sizeof(arpPacket));
if(!CheckMAC(argv[4],arpPacket.phyFrame.DstMAC))
return;
if(!CheckMAC(argv[2],arpPacket.phyFrame.SrcMAC))
return;
arpPacket.phyFrame.FrameType=htons((unsigned short)0x0608);

arpPacket.arpFrame.HardwareType=(unsigned short)0x0100;
arpPacket.arpFrame.ProtocolType=(unsigned short)0x0008;
arpPacket.arpFrame.MACLen=(unsigned char)6;
arpPacket.arpFrame.IPLen=(unsigned char)4;
if(!CheckMAC(argv[2],arpPacket.arpFrame.SrcMAC))
return;
if(!CheckIP(argv[1],arpPacket.arpFrame.SrcIP))
return;
if(!CheckMAC(argv[4],arpPacket.arpFrame.DstMAC))
return;
if(!CheckIP(argv[3],arpPacket.arpFrame.DstIP))
return;
for(i=0;i<18;i++)
arpPacket.arpFrame.Padding[i]=0;

pcap_if_t *alldevs;
pcap_if_t *d,*head=NULL;
pcap_t *fp;
char errbuf[PCAP_ERRBUF_SIZE];

if(pcap_findalldevs(&alldevs,errbuf)==-1)
{
cout<<"Unable to create adapter list!"<<endl;
return;
}

i=0;
for(d=alldevs;d;d=d->next)
{
cout<<++i<<": "<<d->name;
if(d->description)
cout<<" "<<d->description<<endl;
}

if(i==0)
{
cout<<"No adapter found!"<<endl;
return;
}

cout<<"Enter the interface number (1-"<<i<<")";
int k;
cin>>k;
if(k<1||k>i)
{
cout<<"Out of range!"<<endl;
return;
}
for(d=alldevs,i=1;i<k;d=d->next,i++);
head=d;

if((fp=pcap_open_live(head->name,1000,1,1000,errbuf))==NULL)
{
cout<<"Unable to open the adapter!"<<endl;
pcap_freealldevs(alldevs);
return;
}

if(pcap_sendpacket(fp,(unsigned char*)&arpPacket,sizeof((unsigned char*)&arpPacket))==-1)
{
cout<<"ARP packet send error!"<<endl;
return;
}

cout<<"Source MAC: "<<argv[1]<<endl;
cout<<"Source IP: "<<argv[2]<<endl;
cout<<"Dest MAC: "<<argv[3]<<endl;
cout<<"Dest MAC: "<<argv[4]<<endl;
cout<<"ARP packet send success!"<<endl;
}

结果截图