- 1 year ago
How to allow requests ICMPv4 from my application C++? Windows 8.1+
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To allow ICMPv4 (ping) requests from your C++ application on Windows 8.1 and later, you need to create a rule in the Windows Firewall to allow incoming ICMP traffic. Here's how you can do it programmatically using C++:
- Include Necessary Headers:
cpp#include <Windows.h>
#include <netfw.h> // Windows Firewall COM interface
- CoInitialize:
Before working with COM objects, initialize COM using CoInitialize
:
cppHRESULT hr = CoInitialize(nullptr);
if (FAILED(hr)) {
// Handle initialization error
return 1;
}
- Create Windows Firewall COM Object:
cppINetFwPolicy2* pNetFwPolicy2 = nullptr;
HRESULT hr = CoCreateInstance(__uuidof(NetFwPolicy2), nullptr, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pNetFwPolicy2));
if (FAILED(hr)) {
// Handle creation error
CoUninitialize();
return 1;
}
- Create ICMPv4 Inbound Rule:
cppINetFwRule* pNetFwRule = nullptr;
hr = CoCreateInstance(__uuidof(NetFwRule), nullptr, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pNetFwRule));
if (SUCCEEDED(hr)) {
// Set rule properties
pNetFwRule->put_Action(NET_FW_ACTION_ALLOW);
pNetFwRule->put_Description(L"Allow ICMPv4");
pNetFwRule->put_Direction(NET_FW_RULE_DIR_IN);
pNetFwRule->put_Protocol(NET_FW_IP_PROTOCOL_ICMPv4);
pNetFwRule->put_Enabled(VARIANT_TRUE);
// Add rule to the Windows Firewall
INetFwRules* pNetFwRules = nullptr;
hr = pNetFwPolicy2->get_Rules(&pNetFwRules);
if (SUCCEEDED(hr)) {
hr = pNetFwRules->Add(pNetFwRule);
pNetFwRules->Release();
}
pNetFwRule->Release();
}
pNetFwPolicy2->Release();
- CoUninitialize:
After you're done working with COM objects, uninitialize COM:
cppCoUninitialize();
Remember to run your application with administrative privileges so that it can create firewall rules.
Please note that altering firewall rules is a security-sensitive operation, and you should consider implementing proper error handling and user notifications to ensure that the user is aware of and agrees to the changes being made.