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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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464 lines
13 KiB
464 lines
13 KiB
/* |
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* Copyright (c) 2013-2020, The PurpleI2P Project |
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* |
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* This file is part of Purple i2pd project and licensed under BSD3 |
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* |
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* See full license text in LICENSE file at top of project tree |
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*/ |
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#include <cstdlib> |
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#include <string> |
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#include <boost/asio.hpp> |
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#include "util.h" |
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#include "Log.h" |
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#if not defined (__FreeBSD__) |
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#include <pthread.h> |
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#endif |
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#if defined(__OpenBSD__) || defined(__FreeBSD__) |
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#include <pthread_np.h> |
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#endif |
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#ifdef _WIN32 |
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#include <stdlib.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include <sysinfoapi.h> |
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#include <winsock2.h> |
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#include <ws2tcpip.h> |
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#include <iphlpapi.h> |
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#include <shlobj.h> |
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#ifdef _MSC_VER |
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#pragma comment(lib, "IPHLPAPI.lib") |
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#endif // _MSC_VER |
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#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x)) |
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#define FREE(x) HeapFree(GetProcessHeap(), 0, (x)) |
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// inet_pton exists Windows since Vista, but XP doesn't have that function! |
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// This function was written by Petar Korponai?. See http://stackoverflow.com/questions/15660203/inet-pton-identifier-not-found |
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int inet_pton_xp (int af, const char *src, void *dst) |
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{ |
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struct sockaddr_storage ss; |
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int size = sizeof (ss); |
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char src_copy[INET6_ADDRSTRLEN + 1]; |
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ZeroMemory (&ss, sizeof (ss)); |
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strncpy (src_copy, src, INET6_ADDRSTRLEN + 1); |
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src_copy[INET6_ADDRSTRLEN] = 0; |
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if (WSAStringToAddress (src_copy, af, NULL, (struct sockaddr *)&ss, &size) == 0) |
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{ |
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switch (af) |
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{ |
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case AF_INET: |
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*(struct in_addr *)dst = ((struct sockaddr_in *)&ss)->sin_addr; |
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return 1; |
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case AF_INET6: |
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*(struct in6_addr *)dst = ((struct sockaddr_in6 *)&ss)->sin6_addr; |
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return 1; |
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} |
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} |
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return 0; |
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} |
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#else /* !_WIN32 => UNIX */ |
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#include <sys/types.h> |
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#include <ifaddrs.h> |
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#endif |
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#define address_pair_v4(a,b) { boost::asio::ip::address_v4::from_string (a).to_ulong (), boost::asio::ip::address_v4::from_string (b).to_ulong () } |
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#define address_pair_v6(a,b) { boost::asio::ip::address_v6::from_string (a).to_bytes (), boost::asio::ip::address_v6::from_string (b).to_bytes () } |
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namespace i2p |
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{ |
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namespace util |
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{ |
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void RunnableService::StartIOService () |
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{ |
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if (!m_IsRunning) |
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{ |
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m_IsRunning = true; |
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m_Thread.reset (new std::thread (std::bind (& RunnableService::Run, this))); |
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} |
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} |
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void RunnableService::StopIOService () |
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{ |
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if (m_IsRunning) |
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{ |
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m_IsRunning = false; |
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m_Service.stop (); |
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if (m_Thread) |
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{ |
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m_Thread->join (); |
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m_Thread = nullptr; |
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} |
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} |
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} |
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void RunnableService::Run () |
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{ |
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SetThreadName(m_Name.c_str()); |
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while (m_IsRunning) |
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{ |
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try |
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{ |
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m_Service.run (); |
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} |
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catch (std::exception& ex) |
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{ |
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LogPrint (eLogError, m_Name, ": runtime exception: ", ex.what ()); |
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} |
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} |
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} |
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void SetThreadName (const char *name) { |
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#if defined (__APPLE__) |
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pthread_setname_np(name); |
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#elif defined(__FreeBSD__) |
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pthread_set_name_np(pthread_self(), name) |
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#else |
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pthread_setname_np(pthread_self(), name); |
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#endif |
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} |
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namespace net |
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{ |
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#ifdef _WIN32 |
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bool IsWindowsXPorLater () |
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{ |
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static bool isRequested = false; |
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static bool isXP = false; |
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if (!isRequested) |
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{ |
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// request |
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OSVERSIONINFO osvi; |
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ZeroMemory(&osvi, sizeof(OSVERSIONINFO)); |
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osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); |
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GetVersionEx(&osvi); |
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isXP = osvi.dwMajorVersion <= 5; |
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isRequested = true; |
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} |
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return isXP; |
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} |
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int GetMTUWindowsIpv4 (sockaddr_in inputAddress, int fallback) |
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{ |
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ULONG outBufLen = 0; |
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PIP_ADAPTER_ADDRESSES pAddresses = nullptr; |
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PIP_ADAPTER_ADDRESSES pCurrAddresses = nullptr; |
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PIP_ADAPTER_UNICAST_ADDRESS pUnicast = nullptr; |
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if(GetAdaptersAddresses(AF_INET, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen) |
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== ERROR_BUFFER_OVERFLOW) |
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{ |
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FREE(pAddresses); |
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pAddresses = (IP_ADAPTER_ADDRESSES*) MALLOC(outBufLen); |
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} |
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DWORD dwRetVal = GetAdaptersAddresses( |
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AF_INET, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen |
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); |
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if(dwRetVal != NO_ERROR) |
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{ |
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LogPrint(eLogError, "NetIface: GetMTU(): enclosed GetAdaptersAddresses() call has failed"); |
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FREE(pAddresses); |
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return fallback; |
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} |
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pCurrAddresses = pAddresses; |
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while(pCurrAddresses) |
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{ |
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PIP_ADAPTER_UNICAST_ADDRESS firstUnicastAddress = pCurrAddresses->FirstUnicastAddress; |
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pUnicast = pCurrAddresses->FirstUnicastAddress; |
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if(pUnicast == nullptr) |
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LogPrint(eLogError, "NetIface: GetMTU(): not a unicast ipv4 address, this is not supported"); |
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for(int i = 0; pUnicast != nullptr; ++i) |
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{ |
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LPSOCKADDR lpAddr = pUnicast->Address.lpSockaddr; |
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sockaddr_in* localInterfaceAddress = (sockaddr_in*) lpAddr; |
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if(localInterfaceAddress->sin_addr.S_un.S_addr == inputAddress.sin_addr.S_un.S_addr) |
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{ |
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auto result = pAddresses->Mtu; |
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FREE(pAddresses); |
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return result; |
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} |
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pUnicast = pUnicast->Next; |
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} |
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pCurrAddresses = pCurrAddresses->Next; |
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} |
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LogPrint(eLogError, "NetIface: GetMTU(): no usable unicast ipv4 addresses found"); |
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FREE(pAddresses); |
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return fallback; |
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} |
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int GetMTUWindowsIpv6 (sockaddr_in6 inputAddress, int fallback) |
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{ |
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ULONG outBufLen = 0; |
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PIP_ADAPTER_ADDRESSES pAddresses = nullptr; |
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PIP_ADAPTER_ADDRESSES pCurrAddresses = nullptr; |
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PIP_ADAPTER_UNICAST_ADDRESS pUnicast = nullptr; |
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if(GetAdaptersAddresses(AF_INET6, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen) |
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== ERROR_BUFFER_OVERFLOW) |
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{ |
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FREE(pAddresses); |
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pAddresses = (IP_ADAPTER_ADDRESSES*) MALLOC(outBufLen); |
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} |
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DWORD dwRetVal = GetAdaptersAddresses( |
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AF_INET6, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen |
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); |
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if(dwRetVal != NO_ERROR) |
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{ |
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LogPrint(eLogError, "NetIface: GetMTU(): enclosed GetAdaptersAddresses() call has failed"); |
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FREE(pAddresses); |
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return fallback; |
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} |
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bool found_address = false; |
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pCurrAddresses = pAddresses; |
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while(pCurrAddresses) |
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{ |
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PIP_ADAPTER_UNICAST_ADDRESS firstUnicastAddress = pCurrAddresses->FirstUnicastAddress; |
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pUnicast = pCurrAddresses->FirstUnicastAddress; |
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if(pUnicast == nullptr) |
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LogPrint(eLogError, "NetIface: GetMTU(): not a unicast ipv6 address, this is not supported"); |
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for(int i = 0; pUnicast != nullptr; ++i) |
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{ |
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LPSOCKADDR lpAddr = pUnicast->Address.lpSockaddr; |
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sockaddr_in6 *localInterfaceAddress = (sockaddr_in6*) lpAddr; |
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for (int j = 0; j != 8; ++j) |
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{ |
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if (localInterfaceAddress->sin6_addr.u.Word[j] != inputAddress.sin6_addr.u.Word[j]) |
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break; |
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else |
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found_address = true; |
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} |
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if (found_address) |
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{ |
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auto result = pAddresses->Mtu; |
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FREE(pAddresses); |
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pAddresses = nullptr; |
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return result; |
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} |
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pUnicast = pUnicast->Next; |
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} |
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pCurrAddresses = pCurrAddresses->Next; |
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} |
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LogPrint(eLogError, "NetIface: GetMTU(): no usable unicast ipv6 addresses found"); |
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FREE(pAddresses); |
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return fallback; |
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} |
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int GetMTUWindows (const boost::asio::ip::address& localAddress, int fallback) |
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{ |
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#ifdef UNICODE |
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string localAddress_temporary = localAddress.to_string(); |
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wstring localAddressUniversal(localAddress_temporary.begin(), localAddress_temporary.end()); |
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#else |
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std::string localAddressUniversal = localAddress.to_string(); |
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#endif |
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typedef int (* IPN)(int af, const char *src, void *dst); |
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IPN inetpton = (IPN)GetProcAddress (GetModuleHandle ("ws2_32.dll"), "InetPton"); |
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if (!inetpton) inetpton = inet_pton_xp; // use own implementation if not found |
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if(localAddress.is_v4()) |
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{ |
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sockaddr_in inputAddress; |
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inetpton(AF_INET, localAddressUniversal.c_str(), &(inputAddress.sin_addr)); |
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return GetMTUWindowsIpv4(inputAddress, fallback); |
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} |
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else if(localAddress.is_v6()) |
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{ |
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sockaddr_in6 inputAddress; |
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inetpton(AF_INET6, localAddressUniversal.c_str(), &(inputAddress.sin6_addr)); |
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return GetMTUWindowsIpv6(inputAddress, fallback); |
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} |
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else |
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{ |
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LogPrint(eLogError, "NetIface: GetMTU(): address family is not supported"); |
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return fallback; |
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} |
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} |
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#else // assume unix |
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int GetMTUUnix (const boost::asio::ip::address& localAddress, int fallback) |
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{ |
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ifaddrs* ifaddr, *ifa = nullptr; |
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if(getifaddrs(&ifaddr) == -1) |
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{ |
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LogPrint(eLogError, "NetIface: Can't call getifaddrs(): ", strerror(errno)); |
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return fallback; |
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} |
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int family = 0; |
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// look for interface matching local address |
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for(ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next) |
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{ |
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if(!ifa->ifa_addr) |
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continue; |
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family = ifa->ifa_addr->sa_family; |
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if(family == AF_INET && localAddress.is_v4()) |
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{ |
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sockaddr_in* sa = (sockaddr_in*) ifa->ifa_addr; |
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if(!memcmp(&sa->sin_addr, localAddress.to_v4().to_bytes().data(), 4)) |
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break; // address matches |
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} |
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else if(family == AF_INET6 && localAddress.is_v6()) |
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{ |
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sockaddr_in6* sa = (sockaddr_in6*) ifa->ifa_addr; |
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if(!memcmp(&sa->sin6_addr, localAddress.to_v6().to_bytes().data(), 16)) |
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break; // address matches |
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} |
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} |
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int mtu = fallback; |
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if(ifa && family) |
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{ // interface found? |
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int fd = socket(family, SOCK_DGRAM, 0); |
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if(fd > 0) |
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{ |
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ifreq ifr; |
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strncpy(ifr.ifr_name, ifa->ifa_name, IFNAMSIZ); // set interface for query |
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if(ioctl(fd, SIOCGIFMTU, &ifr) >= 0) |
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mtu = ifr.ifr_mtu; // MTU |
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else |
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LogPrint (eLogError, "NetIface: Failed to run ioctl: ", strerror(errno)); |
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close(fd); |
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} |
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else |
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LogPrint(eLogError, "NetIface: Failed to create datagram socket"); |
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} |
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else |
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LogPrint(eLogWarning, "NetIface: interface for local address", localAddress.to_string(), " not found"); |
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freeifaddrs(ifaddr); |
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return mtu; |
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} |
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#endif // _WIN32 |
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int GetMTU (const boost::asio::ip::address& localAddress) |
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{ |
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int fallback = localAddress.is_v6 () ? 1280 : 620; // fallback MTU |
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#ifdef _WIN32 |
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return GetMTUWindows(localAddress, fallback); |
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#else |
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return GetMTUUnix(localAddress, fallback); |
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#endif |
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return fallback; |
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} |
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const boost::asio::ip::address GetInterfaceAddress (const std::string & ifname, bool ipv6) |
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{ |
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#ifdef _WIN32 |
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LogPrint(eLogError, "NetIface: cannot get address by interface name, not implemented on WIN32"); |
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if(ipv6) |
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return boost::asio::ip::address::from_string("::1"); |
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else |
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return boost::asio::ip::address::from_string("127.0.0.1"); |
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#else |
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int af = (ipv6 ? AF_INET6 : AF_INET); |
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ifaddrs * addrs = nullptr; |
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if(getifaddrs(&addrs) == 0) |
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{ |
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// got ifaddrs |
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ifaddrs * cur = addrs; |
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while(cur) |
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{ |
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std::string cur_ifname(cur->ifa_name); |
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if (cur_ifname == ifname && cur->ifa_addr && cur->ifa_addr->sa_family == af) |
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{ |
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// match |
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char addr[INET6_ADDRSTRLEN]; |
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memset (addr, 0, INET6_ADDRSTRLEN); |
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if(af == AF_INET) |
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inet_ntop(af, &((sockaddr_in *)cur->ifa_addr)->sin_addr, addr, INET6_ADDRSTRLEN); |
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else |
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inet_ntop(af, &((sockaddr_in6 *)cur->ifa_addr)->sin6_addr, addr, INET6_ADDRSTRLEN); |
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freeifaddrs(addrs); |
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std::string cur_ifaddr(addr); |
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return boost::asio::ip::address::from_string(cur_ifaddr); |
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} |
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cur = cur->ifa_next; |
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} |
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} |
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if(addrs) freeifaddrs(addrs); |
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std::string fallback; |
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if(ipv6) |
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{ |
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fallback = "::1"; |
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LogPrint(eLogWarning, "NetIface: cannot find ipv6 address for interface ", ifname); |
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} else { |
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fallback = "127.0.0.1"; |
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LogPrint(eLogWarning, "NetIface: cannot find ipv4 address for interface ", ifname); |
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} |
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return boost::asio::ip::address::from_string(fallback); |
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#endif |
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} |
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bool IsInReservedRange (const boost::asio::ip::address& host) { |
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// https://en.wikipedia.org/wiki/Reserved_IP_addresses |
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if(host.is_v4()) |
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{ |
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static const std::vector< std::pair<uint32_t, uint32_t> > reservedIPv4Ranges { |
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address_pair_v4("0.0.0.0", "0.255.255.255"), |
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address_pair_v4("10.0.0.0", "10.255.255.255"), |
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address_pair_v4("100.64.0.0", "100.127.255.255"), |
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address_pair_v4("127.0.0.0", "127.255.255.255"), |
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address_pair_v4("169.254.0.0", "169.254.255.255"), |
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address_pair_v4("172.16.0.0", "172.31.255.255"), |
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address_pair_v4("192.0.0.0", "192.0.0.255"), |
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address_pair_v4("192.0.2.0", "192.0.2.255"), |
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address_pair_v4("192.88.99.0", "192.88.99.255"), |
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address_pair_v4("192.168.0.0", "192.168.255.255"), |
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address_pair_v4("198.18.0.0", "192.19.255.255"), |
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address_pair_v4("198.51.100.0", "198.51.100.255"), |
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address_pair_v4("203.0.113.0", "203.0.113.255"), |
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address_pair_v4("224.0.0.0", "255.255.255.255") |
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}; |
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uint32_t ipv4_address = host.to_v4 ().to_ulong (); |
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for(const auto& it : reservedIPv4Ranges) { |
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if (ipv4_address >= it.first && ipv4_address <= it.second) |
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return true; |
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} |
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} |
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if(host.is_v6()) |
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{ |
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static const std::vector< std::pair<boost::asio::ip::address_v6::bytes_type, boost::asio::ip::address_v6::bytes_type> > reservedIPv6Ranges { |
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address_pair_v6("2001:db8::", "2001:db8:ffff:ffff:ffff:ffff:ffff:ffff"), |
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address_pair_v6("fc00::", "fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"), |
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address_pair_v6("fe80::", "febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff") |
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}; |
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boost::asio::ip::address_v6::bytes_type ipv6_address = host.to_v6 ().to_bytes (); |
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for(const auto& it : reservedIPv6Ranges) { |
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if (ipv6_address >= it.first && ipv6_address <= it.second) |
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return true; |
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} |
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} |
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return false; |
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} |
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} // net |
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} // util |
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} // i2p
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