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
#include
#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'-'&&mac[i]<'0')||(mac[i]>'9'&&mac[i]<'A')||(mac[i]>'Z'&&mac[i]<'a')||mac[i]>'z')

{

cout<<"mac address error"<j++;
else

{

k++;
if(j>2)
{
cout<<"mac address errot"<5)
{
cout<<"mac address error"<c+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'.'&&ip[i]<'0')||ip[i]>'9')
{
cout<<"IP address error!"< j++;
else
{
k++;
if(j>3)
{
cout<<"IP address error!"<3)
{
cout<<"IP address error!"<ile(*(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"<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!"<next)
{
cout<<++i<<": "<name;
if(d->description)
cout<<" "<description<";
int k;
cin>>k;
if(k<1||k>i)
{
cout<<"Out of range!"<next,i++);
head=d;

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

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