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307 lines
10 KiB
C++
307 lines
10 KiB
C++
#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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#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 <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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int inet_pton(int af, const char *src, void *dst)
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{ /* This function was written by Petar Korponai?. See
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http://stackoverflow.com/questions/15660203/inet-pton-identifier-not-found */
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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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namespace i2p
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{
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namespace util
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{
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namespace net
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{
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#ifdef WIN32
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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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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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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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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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}
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for(int i = 0; pUnicast != nullptr; ++i) {
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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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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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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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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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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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}
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for(int i = 0; pUnicast != nullptr; ++i) {
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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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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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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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if(localAddress.is_v4()) {
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sockaddr_in inputAddress;
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inet_pton(AF_INET, localAddressUniversal.c_str(), &(inputAddress.sin_addr));
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return GetMTUWindowsIpv4(inputAddress, fallback);
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} else if(localAddress.is_v6()) {
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sockaddr_in6 inputAddress;
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inet_pton(AF_INET6, localAddressUniversal.c_str(), &(inputAddress.sin6_addr));
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return GetMTUWindowsIpv6(inputAddress, fallback);
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} else {
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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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const int fallback = 576; // 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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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 = new char[INET6_ADDRSTRLEN];
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bzero(addr, 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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fallback = "::";
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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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}
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} // util
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} // i2p
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