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IOS/SO: Move default interface code into a separate function 

...so that the function can be more easily reused.
This commit is contained in:
Léo Lam 2018-04-19 16:35:27 +02:00
parent e4276f2983
commit 25b198cac8
1 changed files with 72 additions and 61 deletions
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133
Source/Core/Core/IOS/Network/IP/Top.cpp
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@ -8,6 +8,7 @@
#include <cstddef>
#include <cstring>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
@ -153,6 +154,75 @@ static s32 MapWiiSockOptNameToNative(u32 optname)
return optname;
}
struct DefaultInterface
{
u32 inet; ///< IPv4 address
u32 netmask; ///< IPv4 subnet mask
u32 broadcast; ///< IPv4 broadcast address
};
static std::optional<DefaultInterface> GetSystemDefaultInterface()
{
#ifdef _WIN32
DWORD forwardTableSize, ipTableSize, result;
NET_IFINDEX ifIndex = NET_IFINDEX_UNSPECIFIED;
std::unique_ptr<MIB_IPFORWARDTABLE> forwardTable;
std::unique_ptr<MIB_IPADDRTABLE> ipTable;
forwardTableSize = 0;
if (GetIpForwardTable(nullptr, &forwardTableSize, FALSE) == ERROR_INSUFFICIENT_BUFFER)
{
forwardTable =
std::unique_ptr<MIB_IPFORWARDTABLE>((PMIB_IPFORWARDTABLE) operator new(forwardTableSize));
}
ipTableSize = 0;
if (GetIpAddrTable(nullptr, &ipTableSize, FALSE) == ERROR_INSUFFICIENT_BUFFER)
{
ipTable = std::unique_ptr<MIB_IPADDRTABLE>((PMIB_IPADDRTABLE) operator new(ipTableSize));
}
// find the interface IP used for the default route and use that
result = GetIpForwardTable(forwardTable.get(), &forwardTableSize, FALSE);
// can return ERROR_MORE_DATA on XP even after the first call
while (result == NO_ERROR || result == ERROR_MORE_DATA)
{
for (DWORD i = 0; i < forwardTable->dwNumEntries; ++i)
{
if (forwardTable->table[i].dwForwardDest == 0)
{
ifIndex = forwardTable->table[i].dwForwardIfIndex;
break;
}
}
if (result == NO_ERROR || ifIndex != NET_IFINDEX_UNSPECIFIED)
break;
result = GetIpForwardTable(forwardTable.get(), &forwardTableSize, FALSE);
}
if (ifIndex != NET_IFINDEX_UNSPECIFIED &&
GetIpAddrTable(ipTable.get(), &ipTableSize, FALSE) == NO_ERROR)
{
for (DWORD i = 0; i < ipTable->dwNumEntries; ++i)
{
const auto& entry = ipTable->table[i];
if (entry.dwIndex == ifIndex)
return DefaultInterface{entry.dwAddr, entry.dwMask, entry.dwBCastAddr};
}
}
#endif
return {};
}
static DefaultInterface GetSystemDefaultInterfaceOrFallback()
{
static constexpr DefaultInterface FALLBACK_VALUES{
inet_addr(10, 0, 1, 30), inet_addr(255, 255, 255, 0), inet_addr(10, 0, 255, 255)};
return GetSystemDefaultInterface().value_or(FALLBACK_VALUES);
}
IPCCommandResult NetIPTop::IOCtl(const IOCtlRequest& request)
{
if (Core::WantsDeterminism())
@ -433,67 +503,8 @@ IPCCommandResult NetIPTop::HandleGetPeerNameRequest(const IOCtlRequest& request)
IPCCommandResult NetIPTop::HandleGetHostIDRequest(const IOCtlRequest& request)
{
request.Log(GetDeviceName(), LogTypes::IOS_WC24);
s32 return_value = 0;
#ifdef _WIN32
DWORD forwardTableSize, ipTableSize, result;
NET_IFINDEX ifIndex = NET_IFINDEX_UNSPECIFIED;
std::unique_ptr<MIB_IPFORWARDTABLE> forwardTable;
std::unique_ptr<MIB_IPADDRTABLE> ipTable;
forwardTableSize = 0;
if (GetIpForwardTable(nullptr, &forwardTableSize, FALSE) == ERROR_INSUFFICIENT_BUFFER)
{
forwardTable =
std::unique_ptr<MIB_IPFORWARDTABLE>((PMIB_IPFORWARDTABLE) operator new(forwardTableSize));
}
ipTableSize = 0;
if (GetIpAddrTable(nullptr, &ipTableSize, FALSE) == ERROR_INSUFFICIENT_BUFFER)
{
ipTable = std::unique_ptr<MIB_IPADDRTABLE>((PMIB_IPADDRTABLE) operator new(ipTableSize));
}
// find the interface IP used for the default route and use that
result = GetIpForwardTable(forwardTable.get(), &forwardTableSize, FALSE);
// can return ERROR_MORE_DATA on XP even after the first call
while (result == NO_ERROR || result == ERROR_MORE_DATA)
{
for (DWORD i = 0; i < forwardTable->dwNumEntries; ++i)
{
if (forwardTable->table[i].dwForwardDest == 0)
{
ifIndex = forwardTable->table[i].dwForwardIfIndex;
break;
}
}
if (result == NO_ERROR || ifIndex != NET_IFINDEX_UNSPECIFIED)
break;
result = GetIpForwardTable(forwardTable.get(), &forwardTableSize, FALSE);
}
if (ifIndex != NET_IFINDEX_UNSPECIFIED &&
GetIpAddrTable(ipTable.get(), &ipTableSize, FALSE) == NO_ERROR)
{
for (DWORD i = 0; i < ipTable->dwNumEntries; ++i)
{
if (ipTable->table[i].dwIndex == ifIndex)
{
return_value = Common::swap32(ipTable->table[i].dwAddr);
break;
}
}
}
#endif
// default placeholder, in case of failure
if (return_value == 0)
return_value = 192 << 24 | 168 << 16 | 1 << 8 | 150;
return GetDefaultReply(return_value);
const DefaultInterface interface = GetSystemDefaultInterfaceOrFallback();
return GetDefaultReply(Common::swap32(interface.inet));
}
IPCCommandResult NetIPTop::HandleInetAToNRequest(const IOCtlRequest& request)