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#include "stdafx.h"
#include "context.h"
#include <libcommon/string.h>
#include <libcommon/error.h>
#include <log/log.h>
#include <winsock2.h>
#include <ws2ipdef.h>
#include <iphlpapi.h>
#include <windows.h>
#include <vector>
#include <list>
#include <stdexcept>
#include <sstream>
#include <algorithm>
namespace
{
std::set<Context::NetworkAdapter> GetAllAdapters()
{
ULONG bufferSize = 0;
const ULONG flags = GAA_FLAG_SKIP_UNICAST | GAA_FLAG_SKIP_ANYCAST | GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_DNS_SERVER;
auto status = GetAdaptersAddresses(AF_INET, flags, nullptr, nullptr, &bufferSize);
THROW_UNLESS(ERROR_BUFFER_OVERFLOW, status, "Probe for adapter listing buffer size");
// Memory is cheap, this avoids a looping construct.
bufferSize *= 2;
std::vector<uint8_t> buffer(bufferSize);
status = GetAdaptersAddresses(AF_INET, flags, nullptr,
reinterpret_cast<PIP_ADAPTER_ADDRESSES>(&buffer[0]), &bufferSize);
THROW_UNLESS(ERROR_SUCCESS, status, "Retrieve adapter listing");
std::set<Context::NetworkAdapter> adapters;
for (auto it = (PIP_ADAPTER_ADDRESSES)&buffer[0]; nullptr != it; it = it->Next)
{
adapters.emplace(Context::NetworkAdapter(common::string::ToWide(it->AdapterName),
it->Description, it->FriendlyName));
}
return adapters;
}
std::set<Context::NetworkAdapter> GetTapAdapters(const std::set<Context::NetworkAdapter> &adapters)
{
std::set<Context::NetworkAdapter> tapAdapters;
for (const auto &adapter : adapters)
{
static const wchar_t name[] = L"TAP-Windows Adapter V9";
//
// Compare partial name, because once you start having more TAP adapters
// they're named "TAP-Windows Adapter V9 #2" and so on.
//
if (0 == adapter.name.compare(0, _countof(name) - 1, name))
{
tapAdapters.insert(adapter);
}
}
return tapAdapters;
}
void LogAdapters(const std::wstring &description, const std::set<Context::NetworkAdapter> &adapters)
{
//
// Flatten the information so we can log it more easily.
//
std::vector<std::wstring> details;
for (const auto &adapter : adapters)
{
details.emplace_back(L"Adapter");
details.emplace_back(std::wstring(L" Guid: ").append(adapter.guid));
details.emplace_back(std::wstring(L" Name: ").append(adapter.name));
details.emplace_back(std::wstring(L" Alias: ").append(adapter.alias));
}
PluginLogWithDetails(description, details);
}
} // anonymous namespace
Context::BaselineStatus Context::establishBaseline()
{
m_baseline = GetAllAdapters();
auto tapAdapters = GetTapAdapters(m_baseline);
if (tapAdapters.empty())
{
return BaselineStatus::NO_TAP_ADAPTERS_PRESENT;
}
//
// Look for TAP adapter with alias "Mullvad".
//
auto findByAlias = [](const std::set<NetworkAdapter> &adapters, const std::wstring &alias)
{
const auto it = std::find_if(adapters.begin(), adapters.end(), [&alias](const NetworkAdapter &candidate)
{
return 0 == _wcsicmp(candidate.alias.c_str(), alias.c_str());
});
return it != adapters.end();
};
static const wchar_t baseAlias[] = L"Mullvad";
if (findByAlias(tapAdapters, baseAlias))
{
return BaselineStatus::MULLVAD_ADAPTER_PRESENT;
}
//
// Look for TAP adapter with alias "Mullvad-1", "Mullvad-2", etc.
//
for (auto i = 0; i < 10; ++i)
{
std::wstringstream ss;
ss << baseAlias << L"-" << i;
const auto alias = ss.str();
if (findByAlias(tapAdapters, alias))
{
return BaselineStatus::MULLVAD_ADAPTER_PRESENT;
}
}
return BaselineStatus::SOME_TAP_ADAPTERS_PRESENT;
}
void Context::recordCurrentState()
{
m_currentState = GetAllAdapters();
}
Context::NetworkAdapter Context::getNewAdapter()
{
std::list<NetworkAdapter> added;
const auto baselineTaps = GetTapAdapters(m_baseline);
const auto currentTaps = GetTapAdapters(m_currentState);
for (const auto &adapter : currentTaps)
{
if (baselineTaps.end() == baselineTaps.find(adapter))
{
added.push_back(adapter);
}
}
if (added.size() != 1)
{
LogAdapters(L"Enumerable network adapters", m_currentState);
throw std::runtime_error("Unable to identify recently added TAP adapter");
}
return *added.begin();
}
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