?
27. Apr. 2000, 12:41
Hm, da geistert eine Lösung durch's Netz, die sich auf der leider veralteten ICMP.dll abstützt... ist eine Klasse für C++, aber sollte kein Problem in C sein.
Header
#ifndef CPING_H
#define CPING_H
typedef struct tagIPINFO
{
u_char Ttl; // Time To Live
u_char Tos; // Type Of Service
u_char IPFlags; // IP flags
u_char OptSize; // Size of options data
u_char FAR *Options; // Options data buffer
}IPINFO;
typedef IPINFO* PIPINFO;
typedef struct tagICMPECHO
{
u_long Source; // Source address
u_long Status; // IP status
u_long RTTime; // Round trip time in milliseconds
u_short DataSize; // Reply data size
u_short Reserved; // Unknown
void FAR *pData; // Reply data buffer
IPINFO ipInfo; // Reply options
}ICMPECHO;
typedef ICMPECHO* PICMPECHO;
class CPing
{
public:
CPing();
~CPing();
BOOL Ping(char* strHost);
private:
// ICMP.DLL Export Function Pointers
HANDLE (WINAPI *pIcmpCreateFile)(VOID);
BOOL (WINAPI *pIcmpCloseHandle)(HANDLE);
DWORD (WINAPI *pIcmpSendEcho)
(HANDLE,DWORD,LPVOID,WORD,PIPINFO,LPVOID,DWORD,DWORD);
HANDLE hndlIcmp; // LoadLibrary() handle to ICMP.DLL
BOOL bValid; // if it doesn't construct properly, it won't be valid
};
#endif
und dann die Implementation:
Code:
#include "CPing.h"
CPing::CPing()
{
bValid = FALSE;
WSADATA wsaData; // WSADATA
int nRet; // General use return code
// Dynamically load the ICMP.DLL
hndlIcmp = LoadLibrary("ICMP.DLL");
if (hndlIcmp == NULL)
{
::MessageBox(NULL, "Could not load ICMP.DLL", "Error:", MB_OK);
return;
}
// Retrieve ICMP function pointers
pIcmpCreateFile = (HANDLE (WINAPI *)(void))
GetProcAddress((HMODULE)hndlIcmp,"IcmpCreateFile");
pIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
GetProcAddress((HMODULE)hndlIcmp,"IcmpCloseHandle");
pIcmpSendEcho = (DWORD (WINAPI *)
(HANDLE,DWORD,LPVOID,WORD,PIPINFO,LPVOID,DWORD,DWORD))
GetProcAddress((HMODULE)hndlIcmp,"IcmpSendEcho");
// Check all the function pointers
if (pIcmpCreateFile == NULL | |
pIcmpCloseHandle == NULL | |
pIcmpSendEcho == NULL)
{
::MessageBox(NULL, "Error loading ICMP.DLL", "Error:", MB_OK);
FreeLibrary((HMODULE)hndlIcmp);
return;
}
// Init WinSock
nRet = WSAStartup(0x0101, &wsaData );
if (nRet)
{
::MessageBox(NULL, "WSAStartup() error:", "Error:", MB_OK);
WSACleanup();
FreeLibrary((HMODULE)hndlIcmp);
return;
}
// Check WinSock version
if (0x0101 != wsaData.wVersion)
{
::MessageBox(NULL, "No WinSock version 1.1 support found", "Error:", MB_OK);
WSACleanup();
FreeLibrary((HMODULE)hndlIcmp);
return;
}
bValid = TRUE;
}
CPing::~CPing()
{
WSACleanup();
FreeLibrary((HMODULE)hndlIcmp);
}
int CPing::Ping(char* strHost)
{
struct in_addr iaDest; // Internet address structure
LPHOSTENT pHost; // Pointer to host entry structure
DWORD *dwAddress; // IP Address
IPINFO ipInfo; // IP Options structure
ICMPECHO icmpEcho; // ICMP Echo reply buffer
HANDLE hndlFile; // Handle for IcmpCreateFile()
if(!bValid)
{
return FALSE;
}
// Lookup destination
// Use inet_addr() to determine if we're dealing with a name
// or an address
iaDest.s_addr = inet_addr(strHost);
if (iaDest.s_addr == INADDR_NONE)
pHost = gethostbyname(strHost);
else
pHost = gethostbyaddr((const char *)&iaDest,
sizeof(struct in_addr), AF_INET);
if (pHost == NULL)
{
return FALSE;
}
// Copy the IP address
dwAddress = (DWORD *)(*pHost->h_addr_list);
// Get an ICMP echo request handle
hndlFile = pIcmpCreateFile();
// Set some reasonable default values
ipInfo.Ttl = 255;
ipInfo.Tos = 0;
ipInfo.IPFlags = 0;
ipInfo.OptSize = 0;
ipInfo.Options = NULL;
icmpEcho.Status = 0;
// Reqest an ICMP echo
pIcmpSendEcho(
hndlFile, // Handle from IcmpCreateFile()
*dwAddress, // Destination IP address
NULL, // Pointer to buffer to send
0, // Size of buffer in bytes
&ipInfo, // Request options
&icmpEcho, // Reply buffer
sizeof(struct tagICMPECHO),
1000); // Time to wait in milliseconds
// Print the results
iaDest.s_addr = icmpEcho.Source;
if (icmpEcho.Status)
{
return FALSE;
}
// Close the echo request file handle
pIcmpCloseHandle(hndlFile);
return TRUE;
}
Aufruf:
CPing Ping;
int nTime;
nTime = Ping.Ping("www.yahoo.com");
nTime = Ping.Ping("192.168.1.1");
liefert dann die Zeit in Millisekunden.
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[ 09.07.2001: Beitrag editiert von: class CMarcus ]