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Added MTU detection code for Windows

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This commit is contained in:
Yuriy Grishin 2015-03-15 08:51:07 -07:00
parent 1d737409ec
commit f2665262f7
1 changed files with 179 additions and 5 deletions
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184
util.cpp
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@ -19,11 +19,45 @@
#if defined(__linux__) || defined(__FreeBSD_kernel__)
#include <sys/types.h>
#include <ifaddrs.h>
#endif
#ifdef WIN32
#include <Windows.h>
#elif defined(WIN32)
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include <shlobj.h>
#pragma comment(lib, "IPHLPAPI.lib")
#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))
int inet_pton(int af, const char *src, void *dst)
{ /* This function was written by Petar Korponai?. See
http://stackoverflow.com/questions/15660203/inet-pton-identifier-not-found */
struct sockaddr_storage ss;
int size = sizeof (ss);
char src_copy[INET6_ADDRSTRLEN + 1];
ZeroMemory (&ss, sizeof (ss));
strncpy_s (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;
}
#endif
namespace i2p
@ -514,8 +548,148 @@ namespace net
freeifaddrs (ifaddr);
return mtu;
#elif defined(WIN32)
int result = 576; // fallback MTU
DWORD dwRetVal = 0;
ULONG outBufLen = 0;
PIP_ADAPTER_ADDRESSES pAddresses = nullptr;
PIP_ADAPTER_ADDRESSES pCurrAddresses = nullptr;
PIP_ADAPTER_UNICAST_ADDRESS pUnicast = nullptr;
#ifdef UNICODE
string localAddress_temporary = localAddress.to_string();
wstring localAddressUniversal (localAddress_temporary.begin(), localAddress_temporary.end());
#else
return 0;
std::string localAddressUniversal = localAddress.to_string();
#endif
if (localAddress.is_v4())
{
struct sockaddr_in inputAddress;
inet_pton(AF_INET, localAddressUniversal.c_str(), &(inputAddress.sin_addr));
if (GetAdaptersAddresses (AF_INET, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen)
== ERROR_BUFFER_OVERFLOW)
{
FREE (pAddresses);
pAddresses = (IP_ADAPTER_ADDRESSES *)MALLOC (outBufLen);
}
dwRetVal = GetAdaptersAddresses (AF_INET, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen);
if (dwRetVal == NO_ERROR)
{
pCurrAddresses = pAddresses;
while (pCurrAddresses)
{
PIP_ADAPTER_UNICAST_ADDRESS firstUnicastAddress = pCurrAddresses->FirstUnicastAddress;
pUnicast = pCurrAddresses->FirstUnicastAddress;
if (pUnicast != nullptr)
{
for (int i = 0; pUnicast != nullptr; ++i)
{
LPSOCKADDR lpAddr = pUnicast->Address.lpSockaddr;
struct sockaddr_in *localInterfaceAddress = (struct sockaddr_in*) lpAddr;
if (localInterfaceAddress->sin_addr.S_un.S_addr == inputAddress.sin_addr.S_un.S_addr)
{
result = pAddresses->Mtu;
FREE (pAddresses);
pAddresses = nullptr;
return result;
}
pUnicast = pUnicast->Next;
}
}
else
{
LogPrint (eLogError, "GetMTU() has failed: not a unicast ipv4 address, this is not supported");
}
pCurrAddresses = pCurrAddresses->Next;
}
}
else
{
LogPrint (eLogError, "GetMTU() has failed: enclosed GetAdaptersAddresses() call has failed");
}
}
else if (localAddress.is_v6())
{
struct sockaddr_in6 inputAddress;
inet_pton(AF_INET6, localAddressUniversal.c_str(), &(inputAddress.sin6_addr));
if (GetAdaptersAddresses(AF_INET6, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen)
== ERROR_BUFFER_OVERFLOW)
{
FREE (pAddresses);
pAddresses = (IP_ADAPTER_ADDRESSES *)MALLOC(outBufLen);
}
dwRetVal = GetAdaptersAddresses (AF_INET6, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen);
if (dwRetVal == NO_ERROR)
{
bool found_address = false;
pCurrAddresses = pAddresses;
while (pCurrAddresses)
{
PIP_ADAPTER_UNICAST_ADDRESS firstUnicastAddress = pCurrAddresses->FirstUnicastAddress;
pUnicast = pCurrAddresses->FirstUnicastAddress;
if (pUnicast != nullptr)
{
for (int i = 0; pUnicast != nullptr; ++i)
{
LPSOCKADDR lpAddr = pUnicast->Address.lpSockaddr;
struct sockaddr_in6 *localInterfaceAddress = (struct 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)
{
result = pAddresses->Mtu;
FREE (pAddresses);
pAddresses = nullptr;
return result;
}
pUnicast = pUnicast->Next;
}
}
else
{
LogPrint (eLogError, "GetMTU() has failed: not a unicast ipv6 address, this is not supported");
}
pCurrAddresses = pCurrAddresses->Next;
}
}
else
{
LogPrint (eLogError, "GetMTU() has failed: enclosed GetAdaptersAddresses() call has failed");
}
}
else
{
LogPrint (eLogError, "GetMTU() has failed: address family is not supported");
}
FREE (pAddresses);
pAddresses = nullptr;
LogPrint(eLogError, "GetMTU() error: control flow should never reach this line");
return result;
#endif
}
}