實驗三(ICMPPing協(xié)議)

1、實驗三 一、 實驗名稱：ICMP協(xié)議Ping程序實現二、 實驗目的學習ICMP協(xié)議原理, 并掌握在其協(xié)議上進行Ping程序開發(fā)的方法.三、 實驗要求查找資料, 寫出Ping程序原理并編寫程序, 寫出主要使用到的API函數.四、 實驗內容Ping原理:ping的原理就是首先建立通道，然后發(fā)送包，對方接受后返回信息，這個包至少包括以下內容，發(fā)送的時候，包的內容包括對方的ip地址和自己的地址，還有序列數，回送的時候包括雙方地址，還有時間等，主要是接受方在都是在操作系統(tǒng)內核里做好的，時刻在監(jiān)聽，提供一段c程序的代碼，希望對大家有用。向遠程計算機通過ICMP協(xié)議發(fā)送特定的數據包，然后等待回應并接收返回的

2、數據包 ，對每個接收的數據包均根據傳輸的消息進行驗證。默認情況下，傳輸四個包含 32 字節(jié) 數據（由字母組成的一個循環(huán)大寫字母序列）的回顯數據包。過程如下： （1）通過將 ICMP 回顯數據包發(fā)送到計算機并偵聽回顯回復數據包來驗證與一臺或多臺遠程計算機的連接。 （2）每個發(fā)送的數據包最多等待一秒。（3）打印已傳輸和接收的數據包數。主要API函數:#include "stdafx.h"#include "ping.h"#include "pingDlg.h"#include <winsock.h>#ifdef _DEBUG#

3、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:

4、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_

5、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_

6、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 wsa

7、Data;if(WSAStartup( MAKEWORD( 1, 0 ), &wsaData ) != 0)MessageBox("Window Socket 初始化失敗!");return FALSE;/創(chuàng)建SOCKET / AF_INET：協(xié)議族為TCP/IP/SOCK_RAW：原始方式（直接與IP層交換數據）/IPPROTO_ICMP：子協(xié)議類型m_socket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);if(m_socket = INVALID_SOCKET)MessageBox("創(chuàng)建 Socket 失敗

8、!");return FALSE;/ 設置選項：接受超時為100msres = setsockopt(m_socket,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(timeout);if(res = SOCKET_ERROR)MessageBox("設置接受超時為100ms 失敗!");timeout = 1000;/ 設置發(fā)送超時為1000msres = setsockopt(m_socket,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,sizeof(timeout

9、);if(res = SOCKET_ERROR)MessageBox("設置發(fā)送超時為100ms 失敗!");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()

10、;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);

11、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:DestroyWin

12、dow() 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(resp,"rnping %s.rn",ipaddr);AppendMsg(resp);for(n = 0; n < m_Num; n+)if(ping(ipaddr,resp)ok+;AppendMsg(resp);Sleep(1000);if(ok = 0)loss = 100.0f;elseloss = 100.0f - float(n * 100.0f / ok);sprintf(resp,"rnPing %s 的統(tǒng)計結果:rnt發(fā)送 = %d 接收 = %d 丟失 = %.2f",ipaddr,n,ok,loss);AppendMsg(resp);void CPingDlg:AppendMsg(