mirror of
https://github.com/safing/portmaster
synced 2025-09-02 02:29:12 +00:00
322 lines
8.1 KiB
Go
322 lines
8.1 KiB
Go
// +build windows
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package iphelper
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"net"
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"sync"
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"unsafe"
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"github.com/safing/portmaster/network/socket"
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"golang.org/x/sys/windows"
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)
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// Windows API constants
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const (
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iphelperTCPTableOwnerPIDAll uintptr = 5
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iphelperUDPTableOwnerPID uintptr = 1
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iphelperTCPStateListen uint32 = 2
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winErrInsufficientBuffer = uintptr(windows.ERROR_INSUFFICIENT_BUFFER)
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winErrInvalidParameter = uintptr(windows.ERROR_INVALID_PARAMETER)
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)
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type iphelperTCPTable struct {
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// docs: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366921(v=vs.85).aspx
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numEntries uint32
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table [4096]iphelperTCPRow
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}
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type iphelperTCPRow struct {
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// docs: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366913(v=vs.85).aspx
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state uint32
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localAddr uint32
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localPort uint32
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remoteAddr uint32
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remotePort uint32
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owningPid uint32
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}
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type iphelperTCP6Table struct {
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// docs: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366905(v=vs.85).aspx
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numEntries uint32
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table [4096]iphelperTCP6Row
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}
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type iphelperTCP6Row struct {
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// docs: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366896(v=vs.85).aspx
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localAddr [16]byte
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_ uint32 // localScopeID
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localPort uint32
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remoteAddr [16]byte
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_ uint32 // remoteScopeID
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remotePort uint32
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state uint32
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owningPid uint32
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}
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type iphelperUDPTable struct {
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// docs: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366932(v=vs.85).aspx
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numEntries uint32
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table [4096]iphelperUDPRow
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}
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type iphelperUDPRow struct {
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// docs: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366928(v=vs.85).aspx
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localAddr uint32
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localPort uint32
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owningPid uint32
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}
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type iphelperUDP6Table struct {
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// docs: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366925(v=vs.85).aspx
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numEntries uint32
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table [4096]iphelperUDP6Row
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}
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type iphelperUDP6Row struct {
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// docs: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366923(v=vs.85).aspx
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localAddr [16]byte
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_ uint32 // localScopeID
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localPort uint32
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owningPid uint32
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}
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// IP and Protocol constants
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const (
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IPv4 uint8 = 4
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IPv6 uint8 = 6
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TCP uint8 = 6
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UDP uint8 = 17
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)
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const (
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startBufSize = 4096
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// bufSizeUsageTTL defines how often a buffer size is used before it is
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// shrunk again.
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bufSizeUsageTTL = 100
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// maxBufSize is the maximum size we will allocate for responses. This was
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// previously set at 65k, which was too little for some production cases.
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maxBufSize = 1048576 // 2^20B, 1MB
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)
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var (
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bufSize = startBufSize
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bufSizeUsesLeft = bufSizeUsageTTL
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bufSizeLock sync.Mutex
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)
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func getBufSize() int {
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bufSizeLock.Lock()
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defer bufSizeLock.Unlock()
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// using bufSize
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bufSizeUsesLeft--
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// check if we want to reset
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if bufSizeUsesLeft <= 0 {
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// decrease
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bufSize /= 2
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// not too little
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if bufSize < startBufSize {
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bufSize = startBufSize
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}
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// reset counter
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bufSizeUsesLeft = bufSizeUsageTTL
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}
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return bufSize
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}
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func increaseBufSize() int {
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bufSizeLock.Lock()
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defer bufSizeLock.Unlock()
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// increase
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bufSize *= 2
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// not too much
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if bufSize > maxBufSize {
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bufSize = maxBufSize
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}
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// reset
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bufSizeUsesLeft = bufSizeUsageTTL
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// return new bufSize
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return bufSize
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}
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// getTable returns the current connection state table of Windows of the given protocol and IP version.
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func (ipHelper *IPHelper) getTable(ipVersion, protocol uint8) (connections []*socket.ConnectionInfo, binds []*socket.BindInfo, err error) { //nolint:gocognit,gocycle // TODO
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// docs: https://docs.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getextendedtcptable
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if !ipHelper.valid.IsSet() {
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return nil, nil, errInvalid
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}
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var afClass int
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switch ipVersion {
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case IPv4:
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afClass = windows.AF_INET
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case IPv6:
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afClass = windows.AF_INET6
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default:
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return nil, nil, errors.New("invalid protocol")
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}
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// try max 3 times
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maxTries := 3
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bufSize := getBufSize()
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var buf []byte
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for i := 1; i <= maxTries; i++ {
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buf = make([]byte, bufSize)
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var r1 uintptr
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switch protocol {
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case TCP:
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r1, _, err = ipHelper.getExtendedTCPTable.Call(
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uintptr(unsafe.Pointer(&buf[0])), // _Out_ PVOID pTcpTable
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uintptr(unsafe.Pointer(&bufSize)), // _Inout_ PDWORD pdwSize
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0, // _In_ BOOL bOrder
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uintptr(afClass), // _In_ ULONG ulAf
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iphelperTCPTableOwnerPIDAll, // _In_ TCP_TABLE_CLASS TableClass
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0, // _In_ ULONG Reserved
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)
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case UDP:
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r1, _, err = ipHelper.getExtendedUDPTable.Call(
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uintptr(unsafe.Pointer(&buf[0])), // _Out_ PVOID pUdpTable,
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uintptr(unsafe.Pointer(&bufSize)), // _Inout_ PDWORD pdwSize,
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0, // _In_ BOOL bOrder,
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uintptr(afClass), // _In_ ULONG ulAf,
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iphelperUDPTableOwnerPID, // _In_ UDP_TABLE_CLASS TableClass,
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0, // _In_ ULONG Reserved
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)
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}
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switch r1 {
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case winErrInsufficientBuffer:
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if i >= maxTries {
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return nil, nil, fmt.Errorf("insufficient buffer error (tried %d times): [NT 0x%X] %s", i, r1, err)
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}
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bufSize = increaseBufSize()
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case winErrInvalidParameter:
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return nil, nil, fmt.Errorf("invalid parameter: [NT 0x%X] %s", r1, err)
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case windows.NO_ERROR:
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// success
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break
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default:
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return nil, nil, fmt.Errorf("unexpected error: [NT 0x%X] %s", r1, err)
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}
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}
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// parse output
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switch {
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case protocol == TCP && ipVersion == IPv4:
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tcpTable := (*iphelperTCPTable)(unsafe.Pointer(&buf[0]))
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table := tcpTable.table[:tcpTable.numEntries]
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for _, row := range table {
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if row.state == iphelperTCPStateListen {
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binds = append(binds, &socket.BindInfo{
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Local: socket.Address{
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IP: convertIPv4(row.localAddr),
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Port: convertPort(row.localPort),
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},
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PID: int(row.owningPid),
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})
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} else {
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connections = append(connections, &socket.ConnectionInfo{
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Local: socket.Address{
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IP: convertIPv4(row.localAddr),
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Port: convertPort(row.localPort),
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},
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Remote: socket.Address{
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IP: convertIPv4(row.remoteAddr),
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Port: convertPort(row.remotePort),
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},
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PID: int(row.owningPid),
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})
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}
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}
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case protocol == TCP && ipVersion == IPv6:
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tcpTable := (*iphelperTCP6Table)(unsafe.Pointer(&buf[0]))
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table := tcpTable.table[:tcpTable.numEntries]
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for _, row := range table {
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if row.state == iphelperTCPStateListen {
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binds = append(binds, &socket.BindInfo{
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Local: socket.Address{
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IP: net.IP(row.localAddr[:]),
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Port: convertPort(row.localPort),
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},
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PID: int(row.owningPid),
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})
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} else {
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connections = append(connections, &socket.ConnectionInfo{
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Local: socket.Address{
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IP: net.IP(row.localAddr[:]),
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Port: convertPort(row.localPort),
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},
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Remote: socket.Address{
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IP: net.IP(row.remoteAddr[:]),
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Port: convertPort(row.remotePort),
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},
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PID: int(row.owningPid),
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})
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}
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}
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case protocol == UDP && ipVersion == IPv4:
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udpTable := (*iphelperUDPTable)(unsafe.Pointer(&buf[0]))
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table := udpTable.table[:udpTable.numEntries]
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for _, row := range table {
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binds = append(binds, &socket.BindInfo{
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Local: socket.Address{
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IP: convertIPv4(row.localAddr),
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Port: convertPort(row.localPort),
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},
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PID: int(row.owningPid),
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})
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}
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case protocol == UDP && ipVersion == IPv6:
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udpTable := (*iphelperUDP6Table)(unsafe.Pointer(&buf[0]))
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table := udpTable.table[:udpTable.numEntries]
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for _, row := range table {
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binds = append(binds, &socket.BindInfo{
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Local: socket.Address{
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IP: net.IP(row.localAddr[:]),
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Port: convertPort(row.localPort),
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},
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PID: int(row.owningPid),
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})
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}
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}
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return connections, binds, nil
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}
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// convertIPv4 as needed for iphlpapi.dll
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func convertIPv4(input uint32) net.IP {
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addressBuf := make([]byte, 4)
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binary.LittleEndian.PutUint32(addressBuf, input)
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return net.IP(addressBuf)
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}
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// convertPort converts ports received from iphlpapi.dll
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func convertPort(input uint32) uint16 {
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return uint16(input>>8 | input<<8)
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}
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