实验三(ICMPPing协议).doc

实验三 一、 实验名称：ICMP协议Ping程序实现二、 实验目的学习ICMP协议原理, 并掌握在其协议上进行Ping程序开发的方法.三、 实验要求查找资料, 写出Ping程序原理并编写程序, 写出主要使用到的API函数.四、 实验内容Ping原理:ping的原理就是首先建立通道，然后发送包，对方接受后返回信息，这个包至少包括以下内容，发送的时候，包的内容包括对方的ip地址和自己的地址，还有序列数，回送的时候包括双方地址，还有时间等，主要是接受方在都是在操作系统内核里做好的，时刻在监听，提供一段c程序的代码，希望对大家有用。向远程计算机通过ICMP协议发送特定的数据包，然后等待回应并接收返回的数据包 ，对每个接收的数据包均根据传输的消息进行验证。默认情况下，传输四个包含 32 字节 数据（由字母组成的一个循环大写字母序列）的回显数据包。过程如下： （1）通过将 ICMP 回显数据包发送到计算机并侦听回显回复数据包来验证与一台或多台远程计算机的连接。 （2）每个发送的数据包最多等待一秒。（3）打印已传输和接收的数据包数。主要API函数:#include stdafx.h#include ping.h#include pingDlg.h#include #ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE = _FILE_;#endifextern SOCKET m_socket;BOOL ping(const char *ipaddr, char *resp);class CAboutDlg : public CDialogpublic:CAboutDlg();enum IDD = IDD_ABOUTBOX ;protected:virtual void DoDataExchange(CDataExchange* pDX); / DDX/DDV supportprotected:DECLARE_MESSAGE_MAP();CAboutDlg:CAboutDlg() : CDialog(CAboutDlg:IDD)void CAboutDlg:DoDataExchange(CDataExchange* pDX)CDialog:DoDataExchange(pDX);BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)END_MESSAGE_MAP()CPingDlg:CPingDlg(CWnd* pParent /*=NULL*/): CDialog(CPingDlg:IDD, pParent)m_Ctx = _T();m_hIcon = AfxGetApp()-LoadIcon(IDR_MAINFRAME);void CPingDlg:DoDataExchange(CDataExchange* pDX)CDialog:DoDataExchange(pDX);DDX_Control(pDX, IDC_IPADDRESS1, m_IP);DDX_Text(pDX, IDC_EDIT1, m_Ctx);DDX_Text(pDX, IDC_EDIT_NUM, m_Num);BEGIN_MESSAGE_MAP(CPingDlg, CDialog)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_OK, OnOk)ON_BN_CLICKED(IDC_START, OnStart)END_MESSAGE_MAP()BOOL CPingDlg:OnInitDialog()CDialog:OnInitDialog();SetIcon(m_hIcon, TRUE);/ Set big iconSetIcon(m_hIcon, FALSE);/ Set small iconm_IP.SetWindowText(127.0.0.1);intres;inttimeout = 100;WSADATA wsaData;if(WSAStartup( MAKEWORD( 1, 0 ), &wsaData ) != 0)MessageBox(Window Socket 初始化失败!);return FALSE;/创建SOCKET / AF_INET：协议族为TCP/IP/SOCK_RAW：原始方式（直接与IP层交换数据）/IPPROTO_ICMP：子协议类型m_socket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);if(m_socket = INVALID_SOCKET)MessageBox(创建 Socket 失败!);return FALSE;/ 设置选项：接受超时为100msres = setsockopt(m_socket,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(timeout);if(res = SOCKET_ERROR)MessageBox(设置接受超时为100ms 失败!);timeout = 1000;/ 设置发送超时为1000msres = setsockopt(m_socket,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,sizeof(timeout);if(res = SOCKET_ERROR)MessageBox(设置发送超时为100ms 失败!);return TRUE; / return TRUE unless you set the focus to a controlvoid CPingDlg:OnOK() void CPingDlg:OnCancel() void CPingDlg:OnSysCommand(UINT nID, LPARAM lParam)if (nID & 0xFFF0) = IDM_ABOUTBOX)CAboutDlg dlgAbout;dlgAbout.DoModal();elseCDialog:OnSysCommand(nID, lParam);void CPingDlg:OnPaint() if (IsIconic()CPaintDC dc(this); / device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);/ Center icon in client rectangleint cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;/ Draw the icondc.DrawIcon(x, y, m_hIcon);elseCDialog:OnPaint();HCURSOR CPingDlg:OnQueryDragIcon()return (HCURSOR) m_hIcon;void CPingDlg:OnOk() CDialog:OnOK();BOOL CPingDlg:DestroyWindow() closesocket(m_socket);WSACleanup ();return CDialog:DestroyWindow();void CPingDlg:OnStart() charipaddr32;charresp4096;UINTn,ok = 0;floatloss;UpdateData(TRUE);if(m_Num = 0)return;m_IP.GetWindowText(ipaddr,30);sprintf(re