#include #include #include #include "util.h" #include "Log.h" #ifdef WIN32 #include #include #include #include #include #include #include #include #ifdef _MSC_VER #pragma comment(lib, "IPHLPAPI.lib") #endif // _MSC_VER #define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x)) #define FREE(x) HeapFree(GetProcessHeap(), 0, (x)) // inet_pton exists Windows since Vista, but XP doesn't have that function! // This function was written by Petar Korponai?. See http://stackoverflow.com/questions/15660203/inet-pton-identifier-not-found int inet_pton_xp(int af, const char *src, void *dst) { struct sockaddr_storage ss; int size = sizeof (ss); char src_copy[INET6_ADDRSTRLEN + 1]; ZeroMemory (&ss, sizeof (ss)); strncpy (src_copy, src, INET6_ADDRSTRLEN + 1); src_copy[INET6_ADDRSTRLEN] = 0; if (WSAStringToAddress (src_copy, af, NULL, (struct sockaddr *)&ss, &size) == 0) { switch (af) { case AF_INET: *(struct in_addr *)dst = ((struct sockaddr_in *)&ss)->sin_addr; return 1; case AF_INET6: *(struct in6_addr *)dst = ((struct sockaddr_in6 *)&ss)->sin6_addr; return 1; } } return 0; } #else /* !WIN32 => UNIX */ #include #include #endif namespace i2p { namespace util { namespace net { #ifdef WIN32 bool IsWindowsXPorLater() { static bool isRequested = false; static bool isXP = false; if (!isRequested) { // request OSVERSIONINFO osvi; ZeroMemory(&osvi, sizeof(OSVERSIONINFO)); osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); GetVersionEx(&osvi); isXP = osvi.dwMajorVersion <= 5; isRequested = true; } return isXP; } int GetMTUWindowsIpv4(sockaddr_in inputAddress, int fallback) { ULONG outBufLen = 0; PIP_ADAPTER_ADDRESSES pAddresses = nullptr; PIP_ADAPTER_ADDRESSES pCurrAddresses = nullptr; PIP_ADAPTER_UNICAST_ADDRESS pUnicast = nullptr; if(GetAdaptersAddresses(AF_INET, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen) == ERROR_BUFFER_OVERFLOW) { FREE(pAddresses); pAddresses = (IP_ADAPTER_ADDRESSES*) MALLOC(outBufLen); } DWORD dwRetVal = GetAdaptersAddresses( AF_INET, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen ); if(dwRetVal != NO_ERROR) { LogPrint(eLogError, "NetIface: GetMTU(): enclosed GetAdaptersAddresses() call has failed"); FREE(pAddresses); return fallback; } pCurrAddresses = pAddresses; while(pCurrAddresses) { PIP_ADAPTER_UNICAST_ADDRESS firstUnicastAddress = pCurrAddresses->FirstUnicastAddress; pUnicast = pCurrAddresses->FirstUnicastAddress; if(pUnicast == nullptr) LogPrint(eLogError, "NetIface: GetMTU(): not a unicast ipv4 address, this is not supported"); for(int i = 0; pUnicast != nullptr; ++i) { LPSOCKADDR lpAddr = pUnicast->Address.lpSockaddr; sockaddr_in* localInterfaceAddress = (sockaddr_in*) lpAddr; if(localInterfaceAddress->sin_addr.S_un.S_addr == inputAddress.sin_addr.S_un.S_addr) { auto result = pAddresses->Mtu; FREE(pAddresses); return result; } pUnicast = pUnicast->Next; } pCurrAddresses = pCurrAddresses->Next; } LogPrint(eLogError, "NetIface: GetMTU(): no usable unicast ipv4 addresses found"); FREE(pAddresses); return fallback; } int GetMTUWindowsIpv6(sockaddr_in6 inputAddress, int fallback) { ULONG outBufLen = 0; PIP_ADAPTER_ADDRESSES pAddresses = nullptr; PIP_ADAPTER_ADDRESSES pCurrAddresses = nullptr; PIP_ADAPTER_UNICAST_ADDRESS pUnicast = nullptr; if(GetAdaptersAddresses(AF_INET6, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen) == ERROR_BUFFER_OVERFLOW) { FREE(pAddresses); pAddresses = (IP_ADAPTER_ADDRESSES*) MALLOC(outBufLen); } DWORD dwRetVal = GetAdaptersAddresses( AF_INET6, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen ); if(dwRetVal != NO_ERROR) { LogPrint(eLogError, "NetIface: GetMTU(): enclosed GetAdaptersAddresses() call has failed"); FREE(pAddresses); return fallback; } bool found_address = false; pCurrAddresses = pAddresses; while(pCurrAddresses) { PIP_ADAPTER_UNICAST_ADDRESS firstUnicastAddress = pCurrAddresses->FirstUnicastAddress; pUnicast = pCurrAddresses->FirstUnicastAddress; if(pUnicast == nullptr) LogPrint(eLogError, "NetIface: GetMTU(): not a unicast ipv6 address, this is not supported"); for(int i = 0; pUnicast != nullptr; ++i) { LPSOCKADDR lpAddr = pUnicast->Address.lpSockaddr; sockaddr_in6 *localInterfaceAddress = (sockaddr_in6*) lpAddr; for (int j = 0; j != 8; ++j) { if (localInterfaceAddress->sin6_addr.u.Word[j] != inputAddress.sin6_addr.u.Word[j]) break; else found_address = true; } if (found_address) { auto result = pAddresses->Mtu; FREE(pAddresses); pAddresses = nullptr; return result; } pUnicast = pUnicast->Next; } pCurrAddresses = pCurrAddresses->Next; } LogPrint(eLogError, "NetIface: GetMTU(): no usable unicast ipv6 addresses found"); FREE(pAddresses); return fallback; } int GetMTUWindows(const boost::asio::ip::address& localAddress, int fallback) { #ifdef UNICODE string localAddress_temporary = localAddress.to_string(); wstring localAddressUniversal(localAddress_temporary.begin(), localAddress_temporary.end()); #else std::string localAddressUniversal = localAddress.to_string(); #endif typedef int (* IPN)(int af, const char *src, void *dst); IPN inetpton = (IPN)GetProcAddress (GetModuleHandle ("ws2_32.dll"), "InetPton"); if (!inetpton) inetpton = inet_pton_xp; // use own implementation if not found if(localAddress.is_v4()) { sockaddr_in inputAddress; inetpton(AF_INET, localAddressUniversal.c_str(), &(inputAddress.sin_addr)); return GetMTUWindowsIpv4(inputAddress, fallback); } else if(localAddress.is_v6()) { sockaddr_in6 inputAddress; inetpton(AF_INET6, localAddressUniversal.c_str(), &(inputAddress.sin6_addr)); return GetMTUWindowsIpv6(inputAddress, fallback); } else { LogPrint(eLogError, "NetIface: GetMTU(): address family is not supported"); return fallback; } } #else // assume unix int GetMTUUnix(const boost::asio::ip::address& localAddress, int fallback) { ifaddrs* ifaddr, *ifa = nullptr; if(getifaddrs(&ifaddr) == -1) { LogPrint(eLogError, "NetIface: Can't call getifaddrs(): ", strerror(errno)); return fallback; } int family = 0; // look for interface matching local address for(ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next) { if(!ifa->ifa_addr) continue; family = ifa->ifa_addr->sa_family; if(family == AF_INET && localAddress.is_v4()) { sockaddr_in* sa = (sockaddr_in*) ifa->ifa_addr; if(!memcmp(&sa->sin_addr, localAddress.to_v4().to_bytes().data(), 4)) break; // address matches } else if(family == AF_INET6 && localAddress.is_v6()) { sockaddr_in6* sa = (sockaddr_in6*) ifa->ifa_addr; if(!memcmp(&sa->sin6_addr, localAddress.to_v6().to_bytes().data(), 16)) break; // address matches } } int mtu = fallback; if(ifa && family) { // interface found? int fd = socket(family, SOCK_DGRAM, 0); if(fd > 0) { ifreq ifr; strncpy(ifr.ifr_name, ifa->ifa_name, IFNAMSIZ); // set interface for query if(ioctl(fd, SIOCGIFMTU, &ifr) >= 0) mtu = ifr.ifr_mtu; // MTU else LogPrint (eLogError, "NetIface: Failed to run ioctl: ", strerror(errno)); close(fd); } else LogPrint(eLogError, "NetIface: Failed to create datagram socket"); } else LogPrint(eLogWarning, "NetIface: interface for local address", localAddress.to_string(), " not found"); freeifaddrs(ifaddr); return mtu; } #endif // WIN32 int GetMTU(const boost::asio::ip::address& localAddress) { const int fallback = 576; // fallback MTU #ifdef WIN32 return GetMTUWindows(localAddress, fallback); #else return GetMTUUnix(localAddress, fallback); #endif return fallback; } const boost::asio::ip::address GetInterfaceAddress(const std::string & ifname, bool ipv6) { #ifdef WIN32 LogPrint(eLogError, "NetIface: cannot get address by interface name, not implemented on WIN32"); if(ipv6) return boost::asio::ip::address::from_string("::1"); else return boost::asio::ip::address::from_string("127.0.0.1"); #else int af = (ipv6 ? AF_INET6 : AF_INET); ifaddrs * addrs = nullptr; if(getifaddrs(&addrs) == 0) { // got ifaddrs ifaddrs * cur = addrs; while(cur) { std::string cur_ifname(cur->ifa_name); if (cur_ifname == ifname && cur->ifa_addr && cur->ifa_addr->sa_family == af) { // match char addr[INET6_ADDRSTRLEN]; memset (addr, 0, INET6_ADDRSTRLEN); if(af == AF_INET) inet_ntop(af, &((sockaddr_in *)cur->ifa_addr)->sin_addr, addr, INET6_ADDRSTRLEN); else inet_ntop(af, &((sockaddr_in6 *)cur->ifa_addr)->sin6_addr, addr, INET6_ADDRSTRLEN); freeifaddrs(addrs); std::string cur_ifaddr(addr); return boost::asio::ip::address::from_string(cur_ifaddr); } cur = cur->ifa_next; } } if(addrs) freeifaddrs(addrs); std::string fallback; if(ipv6) { fallback = "::1"; LogPrint(eLogWarning, "NetIface: cannot find ipv6 address for interface ", ifname); } else { fallback = "127.0.0.1"; LogPrint(eLogWarning, "NetIface: cannot find ipv4 address for interface ", ifname); } return boost::asio::ip::address::from_string(fallback); #endif } } } // util } // i2p