在INET上编译执行
注意的是，该软件只支持32位系统
一般在win7-32位
1. 默认值安装 WinPcap_4_0_2.exe 软件。
2. 双击 SimplePAD-客户端 v2.exe。将客户端解压到本地文件夹。
3. 进入解压目录中的\expsys\bin 目录下，双击运行客户端 INEP.exe。
4. 初次登录请选择菜单中“系统”—“系统设置”配置服务器 IP 地址
5. 服务器访问地址
实验控制设备地址：201.118.249.113 协议测试设备地址：202.118.249.116
6. 选择菜单中“系统”—“登录”输入学号，密码进行登录
7. 选择实验内容进行实验
选择好实验内容后，还要把下面的测试内容全部选上
8. 代码编写 点击工具栏的“新建”，系统会自动生成一个模板，包含了所需的头文件、可以调用的系 统函数以及学生需要实现的代码框架。
9. 调试运行
10. 提交结果 在运行的同时，系统会弹出程序执行过程的窗口（见上图） ，在运行结束后该窗口不会 自动关闭，此时需要用户按一下回车键，会出现下面的测试结果窗口，用户可以看到程序运 行的测试结果，并可以将测试结果递交到服务器。
调试代码：
样例1：
/*
* THIS FILE IS FOR IP TEST
*/
// system support
#include "sysInclude.h"
extern void ip_DiscardPkt(char* pBuffer,int type);
extern void ip_SendtoLower(char*pBuffer,int length);
extern void ip_SendtoUp(char *pBuffer,int length);
extern unsigned int getIpv4Address();
// implemented by students
struct Ipv4
{
char version_ihl;
char type_of_service;
short total_length;
short identification;
short fragment_offset;
char time_to_live;
char protocol;
short header_checksum;
unsigned int source_address;
unsigned int destination_address;
Ipv4() {
memset(this,0,sizeof(Ipv4));
}
Ipv4(unsigned int len,unsigned int srcAddr,unsigned int dstAddr,
byte _protocol,byte ttl) {
memset(this,0,sizeof(Ipv4));
version_ihl = 0x45;
total_length = htons(len+20);
time_to_live = ttl;
protocol = _protocol;
source_address = htonl(srcAddr);
destination_address = htonl(dstAddr);
char *pBuffer;
memcpy(pBuffer,this,sizeof(Ipv4));
int sum = 0;
for(int i = 0; i < 10; i++) {
if(i != 5) {
sum += (int)((unsigned char)pBuffer[i*2] << 8);
sum += (int)((unsigned char)pBuffer[i*2+1]);
}
}
while((sum & 0xffff0000) != 0) {
sum = (sum & 0xffff) + ((sum >> 16) & 0xffff);
}
unsigned short int ssum = sum;
header_checksum = htons(~ssum);
}
};
int stud_ip_recv(char *pBuffer,unsigned short length)
{
Ipv4 *ipv4 = new Ipv4();
*ipv4 = *(Ipv4*)pBuffer;
int version = 0xf & ((ipv4->version_ihl)>> 4);
if(version != 4) {
ip_DiscardPkt(pBuffer,STUD_IP_TEST_VERSION_ERROR);
return 1;
}
int ihl = 0xf & ipv4->version_ihl;
if(ihl < 5) {
ip_DiscardPkt(pBuffer,STUD_IP_TEST_HEADLEN_ERROR);
return 1;
}
int ttl = (int)ipv4->time_to_live;
if(ttl == 0) {
ip_DiscardPkt(pBuffer,STUD_IP_TEST_TTL_ERROR);
return 1;
}
int destination_address = ntohl(ipv4->destination_address);
if(destination_address != getIpv4Address() && destination_address != 0xffffffff) {
ip_DiscardPkt(pBuffer,STUD_IP_TEST_DESTINATION_ERROR);
return 1;
}
int header_checksum = ntohs(ipv4->header_checksum);
int sum = 0;
for(int i = 0; i < ihl*2; i++) {
if(i!=5)
{
sum += (int)((unsigned char)pBuffer[i*2] << 8);
sum += (int)((unsigned char)pBuffer[i*2+1]);
}
}
while((sum & 0xffff0000) != 0) {
sum = (sum & 0xffff) + ((sum >> 16) & 0xffff);
}
unsigned short int ssum = (~sum) & 0xffff;
if(ssum != header_checksum) {
ip_DiscardPkt(pBuffer,STUD_IP_TEST_CHECKSUM_ERROR);
return 1;
}
ip_SendtoUp(pBuffer,length);
return 0;
}
int stud_ip_Upsend(char *pBuffer,unsigned short len,unsigned int srcAddr,
unsigned int dstAddr,byte protocol,byte ttl)
{
char *pack_to_sent = new char[len+20];
memset(pack_to_sent,0,len+20);
*((Ipv4*)pack_to_sent) = Ipv4(len,srcAddr,dstAddr,protocol,ttl);
memcpy(pack_to_sent+20,pBuffer,len);
ip_SendtoLower(pack_to_sent,len+20);
delete[] pack_to_sent;
return 0;
}代码样例2：
/*
* THIS FILE IS FOR IP TEST
*/
// system support
#include "sysInclude.h"
#include <stdio.h>
#include <malloc.h>
extern void ip_DiscardPkt(char* pBuffer,int type);
extern void ip_SendtoLower(char*pBuffer,int length);
extern void ip_SendtoUp(char *pBuffer,int length);
extern unsigned int getIpv4Address();
// implemented by students
int stud_ip_recv(char *pBuffer,unsigned short length)
{
int version = pBuffer[0] >> 4;
int headLength = pBuffer[0] & 0xf;
int TTL = (unsigned short)pBuffer[8];
int headCheckSum = ntohs(*(unsigned short *)(pBuffer + 10));
int dstAddr = ntohl(*(unsigned int*)(pBuffer + 16));
//TTL值错误
if (TTL <= 0){
ip_DiscardPkt(pBuffer, STUD_IP_TEST_TTL_ERROR);
return 1;
}
//IP版本号错
if (version != 4){
ip_DiscardPkt(pBuffer, STUD_IP_TEST_VERSION_ERROR);
return 1;
}
//头部长度错
if (headLength < 5){
ip_DiscardPkt(pBuffer, STUD_IP_TEST_HEADLEN_ERROR);
return 1;
}
//目的地址错
if (dstAddr != getIpv4Address() && dstAddr != 0xffff){
ip_DiscardPkt(pBuffer,STUD_IP_TEST_DESTINATION_ERROR);
return 1;
}
//校验和错应该最后检验错误
unsigned short sum = 0;
unsigned short tempNum = 0;
for (int i = 0; i < headLength * 2; i++){
tempNum = ((unsigned char)pBuffer[i*2]<<8) + (unsigned char)pBuffer[i*2 + 1];
if (0xffff - sum < tempNum)
sum = sum + tempNum + 1;
else
sum = sum + tempNum;
}
if (sum != 0xffff){
ip_DiscardPkt(pBuffer, STUD_IP_TEST_CHECKSUM_ERROR);
return 1;
}
//成功接受
ip_SendtoUp(pBuffer,length);
return 0;
}
int stud_ip_Upsend(char *pBuffer,unsigned short len,unsigned int srcAddr,
unsigned int dstAddr,byte protocol,byte ttl)
{
char *IPBuffer = (char *)malloc((20 + len) * sizeof(char));
memset(IPBuffer, 0, len+20);
IPBuffer[0] = 0x45; //版本号+头长度
unsigned short totalLength = htons(len + 20); //分组总长度
memcpy(IPBuffer + 2, &totalLength, 2);
IPBuffer[8] = ttl; //ttl
IPBuffer[9] = protocol; //协议
unsigned int src = htonl(srcAddr);
unsigned int dis = htonl(dstAddr);
memcpy(IPBuffer + 12, &src, 4); //源与目的IP地址
memcpy(IPBuffer + 16, &dis, 4);
unsigned short sum = 0;
unsigned short tempNum = 0;
unsigned short headCheckSum = 0;
//计算checksum
for (int i = 0; i < 10; i++){
tempNum = ((unsigned char)IPBuffer[i*2]<<8) + (unsigned char)IPBuffer[i*2 + 1];
if (0xffff - sum < tempNum)
sum = sum + tempNum + 1;
else
sum = sum + tempNum;
}
headCheckSum = htons(0xffff - sum);
memcpy(IPBuffer + 10, &headCheckSum, 2);
memcpy(IPBuffer + 20, pBuffer, len);
ip_SendtoLower(IPBuffer,len+20);
return 0;
}