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#include "stdafx.h"
#include "context.h"
#include <libcommon/string.h>
#include <libcommon/wmi/connection.h>
#include <libcommon/wmi/resultset.h>
#include <libcommon/wmi/wmi.h>
#include <vector>
#include <stdexcept>
#include <algorithm>
#include <memory>
#include <sstream>
using namespace common;
namespace
{
std::vector<std::wstring> BlockToRows(const std::wstring &textBlock)
{
//
// This is such a hack :-(
//
// It only works because the tokenizer is greedy and because we don't care about
// empty lines for this usage.
//
return common::string::Tokenize(textBlock, L"\r\n");
}
} // anonymous namespace
Context::BaselineStatus Context::establishBaseline(const std::wstring &textBlock)
{
m_baseline = ParseVirtualNics(textBlock);
if (m_baseline.empty())
{
return BaselineStatus::NO_INTERFACES_PRESENT;
}
for (const auto &nic : m_baseline)
{
if (0 == _wcsicmp(nic.alias.c_str(), L"mullvad"))
{
return BaselineStatus::MULLVAD_INTERFACE_PRESENT;
}
}
return BaselineStatus::SOME_INTERFACES_PRESENT;
}
void Context::recordCurrentState(const std::wstring &textBlock)
{
m_currentState = ParseVirtualNics(textBlock);
}
Context::VirtualNic Context::getNewAdapter()
{
std::vector<VirtualNic> added;
for (const auto &nic : m_currentState)
{
if (m_baseline.end() == m_baseline.find(nic))
{
added.push_back(nic);
}
}
if (added.size() != 1)
{
throw std::runtime_error("Unable to identify newly added virtual adapter");
}
return added[0];
}
//static
std::set<Context::VirtualNic> Context::ParseVirtualNics(const std::wstring &textBlock)
{
// ROOT\NET\0000
// Name: TAP - Windows Adapter V9
// Hardware IDs :
// tap0901
// 1 matching device(s) found.
std::set<VirtualNic> nics;
auto text = BlockToRows(textBlock);
size_t line = 0;
while (nullptr != wcschr(text.at(line).c_str(), L'\\'))
{
auto nameDelimiter = wcschr(text.at(line + 1).c_str(), L':');
if (nullptr == nameDelimiter)
{
throw std::runtime_error("Unexpected formatting in input data");
}
VirtualNic nic;
nic.node = text.at(line);
nic.name = std::wstring(nameDelimiter + 2);
nic.alias = GetNicAlias(nic.name);
nics.emplace(std::move(nic));
line += 4;
}
return nics;
}
//static
std::wstring Context::GetNicAlias(const std::wstring &name)
{
static wmi::Connection connection(wmi::Connection::Namespace::Cimv2);
std::wstringstream ss;
ss << L"SELECT * from Win32_NetworkAdapter WHERE Name = \"" << name << L"\"";
auto resultset = connection.query(ss.str().c_str());
if (false == resultset.advance())
{
throw std::runtime_error("Unable to look up virtual adapter using WMI");
}
auto alias = wmi::WmiGetPropertyAlways(resultset.result(), L"NetConnectionID");
return V_BSTR(&alias);
}
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