wip: migrate to mono-repo. SPN has already been moved to spn/
This commit is contained in:
Patrick Pacher
71
service/network/iphelper/get.go
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71
service/network/iphelper/get.go
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@@ -0,0 +1,71 @@
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//go:build windows
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package iphelper
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import (
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"sync"
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"github.com/safing/portmaster/service/network/socket"
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)
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var (
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ipHelper *IPHelper
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// lock locks access to the whole DLL.
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// TODO: It's unproven if we can access the iphlpapi.dll concurrently, especially as we might be encountering various versions of the DLL. In the future, we could possibly investigate and improve performance here.
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lock sync.RWMutex
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)
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// GetTCP4Table returns the system table for IPv4 TCP activity.
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func GetTCP4Table() (connections []*socket.ConnectionInfo, listeners []*socket.BindInfo, err error) {
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lock.Lock()
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defer lock.Unlock()
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err = checkIPHelper()
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if err != nil {
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return nil, nil, err
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}
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return ipHelper.getTable(IPv4, TCP)
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}
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// GetTCP6Table returns the system table for IPv6 TCP activity.
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func GetTCP6Table() (connections []*socket.ConnectionInfo, listeners []*socket.BindInfo, err error) {
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lock.Lock()
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defer lock.Unlock()
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err = checkIPHelper()
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if err != nil {
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return nil, nil, err
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}
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return ipHelper.getTable(IPv6, TCP)
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}
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// GetUDP4Table returns the system table for IPv4 UDP activity.
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func GetUDP4Table() (binds []*socket.BindInfo, err error) {
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lock.Lock()
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defer lock.Unlock()
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err = checkIPHelper()
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if err != nil {
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return nil, err
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}
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_, binds, err = ipHelper.getTable(IPv4, UDP)
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return
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}
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// GetUDP6Table returns the system table for IPv6 UDP activity.
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func GetUDP6Table() (binds []*socket.BindInfo, err error) {
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lock.Lock()
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defer lock.Unlock()
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err = checkIPHelper()
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if err != nil {
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return nil, err
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}
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_, binds, err = ipHelper.getTable(IPv6, UDP)
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return
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}
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63
service/network/iphelper/iphelper.go
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63
service/network/iphelper/iphelper.go
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@@ -0,0 +1,63 @@
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//go:build windows
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package iphelper
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import (
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"errors"
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"fmt"
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"github.com/tevino/abool"
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"golang.org/x/sys/windows"
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)
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var (
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errInvalid = errors.New("IPHelper not initialized or broken")
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)
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// IPHelper represents a subset of the Windows iphlpapi.dll.
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type IPHelper struct {
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dll *windows.LazyDLL
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getExtendedTCPTable *windows.LazyProc
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getExtendedUDPTable *windows.LazyProc
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valid *abool.AtomicBool
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}
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func checkIPHelper() (err error) {
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if ipHelper == nil {
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ipHelper, err = New()
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return err
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}
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return nil
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}
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// New returns a new IPHelper API (with an instance of iphlpapi.dll loaded).
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func New() (*IPHelper, error) {
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new := &IPHelper{}
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new.valid = abool.NewBool(false)
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var err error
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// load dll
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new.dll = windows.NewLazySystemDLL("iphlpapi.dll")
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err = new.dll.Load()
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if err != nil {
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return nil, err
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}
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// load functions
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new.getExtendedTCPTable = new.dll.NewProc("GetExtendedTcpTable")
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err = new.getExtendedTCPTable.Find()
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if err != nil {
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return nil, fmt.Errorf("could find proc GetExtendedTcpTable: %s", err)
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}
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new.getExtendedUDPTable = new.dll.NewProc("GetExtendedUdpTable")
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err = new.getExtendedUDPTable.Find()
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if err != nil {
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return nil, fmt.Errorf("could find proc GetExtendedUdpTable: %s", err)
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}
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new.valid.Set()
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return new, nil
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}
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398
service/network/iphelper/tables.go
Normal file
398
service/network/iphelper/tables.go
Normal file
@@ -0,0 +1,398 @@
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//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/portbase/log"
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"github.com/safing/portmaster/service/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 [maxStateTableEntries]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 [maxStateTableEntries]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 [maxStateTableEntries]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 [maxStateTableEntries]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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type learningBufSize struct {
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sync.Mutex
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size int
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usesLeft int
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useFor int
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start int
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max int
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}
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func newLearningBufSize(start, max, ttl int) *learningBufSize {
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return &learningBufSize{
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size: start,
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usesLeft: ttl,
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useFor: ttl,
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start: start,
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max: max,
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}
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}
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const (
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startBufSize = 1024
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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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// maxStateTableEntries is the maximum supported amount of entries of the
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// state tables.
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// This is never allocated, but just casted to from an unsafe pointer.
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maxStateTableEntries = 65535
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)
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var (
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tcp4BufSize = newLearningBufSize(startBufSize, maxBufSize, bufSizeUsageTTL)
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udp4BufSize = newLearningBufSize(startBufSize, maxBufSize, bufSizeUsageTTL)
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tcp6BufSize = newLearningBufSize(startBufSize, maxBufSize, bufSizeUsageTTL)
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udp6BufSize = newLearningBufSize(startBufSize, maxBufSize, bufSizeUsageTTL)
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)
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func (lbf *learningBufSize) getBufSize() int {
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lbf.Lock()
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defer lbf.Unlock()
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// using bufSize
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lbf.usesLeft--
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// check if we want to reset
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if lbf.usesLeft <= 0 {
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// decrease
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lbf.size /= 2
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// not too little
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if lbf.size < lbf.start {
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lbf.size = lbf.start
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}
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// reset TTL counter
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lbf.usesLeft = lbf.useFor
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}
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return lbf.size
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}
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func (lbf *learningBufSize) increaseBufSize(minSize int) int {
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lbf.Lock()
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defer lbf.Unlock()
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// increase
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lbf.size *= 2
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// increase until we reach the minimum size
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for lbf.size < minSize {
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lbf.size *= 2
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}
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// not too much
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if lbf.size > lbf.max {
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lbf.size = lbf.max
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}
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// reset TTL counter
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lbf.usesLeft = lbf.useFor
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// return new bufSize
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return lbf.size
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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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var lbf *learningBufSize
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switch ipVersion {
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case IPv4:
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afClass = windows.AF_INET
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if protocol == TCP {
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lbf = tcp4BufSize
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} else {
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lbf = udp4BufSize
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}
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case IPv6:
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afClass = windows.AF_INET6
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if protocol == TCP {
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lbf = tcp6BufSize
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} else {
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lbf = udp6BufSize
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}
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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 5 times
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maxTries := 5
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usedBufSize := lbf.getBufSize()
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var buf []byte
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for i := 1; i <= maxTries; i++ {
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bufSizeParam := usedBufSize
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buf = make([]byte, bufSizeParam)
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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(&bufSizeParam)), // _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(&bufSizeParam)), // _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(
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"insufficient buffer error (tried %d times): provided %d bytes; required %d bytes - [NT 0x%X] %s",
|
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i, usedBufSize, bufSizeParam, r1, err,
|
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)
|
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}
|
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// bufSizeParam was modified by ipHelper.getExtended*Table to hold the
|
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// required buffer size.
|
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usedBufSize = lbf.increaseBufSize(bufSizeParam)
|
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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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|
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// parse output
|
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switch {
|
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case protocol == TCP && ipVersion == IPv4:
|
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|
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tcpTable := (*iphelperTCPTable)(unsafe.Pointer(&buf[0]))
|
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// Check if we got more entries than supported.
|
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tableEntries := tcpTable.numEntries
|
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if tableEntries > maxStateTableEntries {
|
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tableEntries = maxStateTableEntries
|
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log.Warningf("network/iphelper: received TCPv4 table with more entries than supported: %d/%d", tcpTable.numEntries, maxStateTableEntries)
|
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}
|
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// Cap table to actual entries.
|
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table := tcpTable.table[:tableEntries]
|
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|
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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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PID: int(row.owningPid),
|
||||
})
|
||||
} else {
|
||||
connections = append(connections, &socket.ConnectionInfo{
|
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Local: socket.Address{
|
||||
IP: convertIPv4(row.localAddr),
|
||||
Port: convertPort(row.localPort),
|
||||
},
|
||||
Remote: socket.Address{
|
||||
IP: convertIPv4(row.remoteAddr),
|
||||
Port: convertPort(row.remotePort),
|
||||
},
|
||||
PID: int(row.owningPid),
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
case protocol == TCP && ipVersion == IPv6:
|
||||
|
||||
tcpTable := (*iphelperTCP6Table)(unsafe.Pointer(&buf[0]))
|
||||
// Check if we got more entries than supported.
|
||||
tableEntries := tcpTable.numEntries
|
||||
if tableEntries > maxStateTableEntries {
|
||||
tableEntries = maxStateTableEntries
|
||||
log.Warningf("network/iphelper: received TCPv6 table with more entries than supported: %d/%d", tcpTable.numEntries, maxStateTableEntries)
|
||||
}
|
||||
// Cap table to actual entries.
|
||||
table := tcpTable.table[:tableEntries]
|
||||
|
||||
for _, row := range table {
|
||||
if row.state == iphelperTCPStateListen {
|
||||
binds = append(binds, &socket.BindInfo{
|
||||
Local: socket.Address{
|
||||
IP: net.IP(row.localAddr[:]),
|
||||
Port: convertPort(row.localPort),
|
||||
},
|
||||
PID: int(row.owningPid),
|
||||
})
|
||||
} else {
|
||||
connections = append(connections, &socket.ConnectionInfo{
|
||||
Local: socket.Address{
|
||||
IP: net.IP(row.localAddr[:]),
|
||||
Port: convertPort(row.localPort),
|
||||
},
|
||||
Remote: socket.Address{
|
||||
IP: net.IP(row.remoteAddr[:]),
|
||||
Port: convertPort(row.remotePort),
|
||||
},
|
||||
PID: int(row.owningPid),
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
case protocol == UDP && ipVersion == IPv4:
|
||||
|
||||
udpTable := (*iphelperUDPTable)(unsafe.Pointer(&buf[0]))
|
||||
// Check if we got more entries than supported.
|
||||
tableEntries := udpTable.numEntries
|
||||
if tableEntries > maxStateTableEntries {
|
||||
tableEntries = maxStateTableEntries
|
||||
log.Warningf("network/iphelper: received UDPv4 table with more entries than supported: %d/%d", udpTable.numEntries, maxStateTableEntries)
|
||||
}
|
||||
// Cap table to actual entries.
|
||||
table := udpTable.table[:tableEntries]
|
||||
|
||||
for _, row := range table {
|
||||
binds = append(binds, &socket.BindInfo{
|
||||
Local: socket.Address{
|
||||
IP: convertIPv4(row.localAddr),
|
||||
Port: convertPort(row.localPort),
|
||||
},
|
||||
PID: int(row.owningPid),
|
||||
})
|
||||
}
|
||||
|
||||
case protocol == UDP && ipVersion == IPv6:
|
||||
|
||||
udpTable := (*iphelperUDP6Table)(unsafe.Pointer(&buf[0]))
|
||||
// Check if we got more entries than supported.
|
||||
tableEntries := udpTable.numEntries
|
||||
if tableEntries > maxStateTableEntries {
|
||||
tableEntries = maxStateTableEntries
|
||||
log.Warningf("network/iphelper: received UDPv6 table with more entries than supported: %d/%d", udpTable.numEntries, maxStateTableEntries)
|
||||
}
|
||||
// Cap table to actual entries.
|
||||
table := udpTable.table[:tableEntries]
|
||||
|
||||
for _, row := range table {
|
||||
binds = append(binds, &socket.BindInfo{
|
||||
Local: socket.Address{
|
||||
IP: net.IP(row.localAddr[:]),
|
||||
Port: convertPort(row.localPort),
|
||||
},
|
||||
PID: int(row.owningPid),
|
||||
})
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
return connections, binds, nil
|
||||
}
|
||||
|
||||
// convertIPv4 as needed for iphlpapi.dll
|
||||
func convertIPv4(input uint32) net.IP {
|
||||
addressBuf := make([]byte, 4)
|
||||
binary.LittleEndian.PutUint32(addressBuf, input)
|
||||
return net.IP(addressBuf)
|
||||
}
|
||||
|
||||
// convertPort converts ports received from iphlpapi.dll
|
||||
func convertPort(input uint32) uint16 {
|
||||
return uint16(input>>8 | input<<8)
|
||||
}
|
||||
54
service/network/iphelper/tables_test.go
Normal file
54
service/network/iphelper/tables_test.go
Normal file
@@ -0,0 +1,54 @@
|
||||
//go:build windows
|
||||
|
||||
package iphelper
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func TestSockets(t *testing.T) {
|
||||
connections, listeners, err := GetTCP4Table()
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
fmt.Println("\nTCP 4 connections:")
|
||||
for _, connection := range connections {
|
||||
fmt.Printf("%+v\n", connection)
|
||||
}
|
||||
fmt.Println("\nTCP 4 listeners:")
|
||||
for _, listener := range listeners {
|
||||
fmt.Printf("%+v\n", listener)
|
||||
}
|
||||
|
||||
connections, listeners, err = GetTCP6Table()
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
fmt.Println("\nTCP 6 connections:")
|
||||
for _, connection := range connections {
|
||||
fmt.Printf("%+v\n", connection)
|
||||
}
|
||||
fmt.Println("\nTCP 6 listeners:")
|
||||
for _, listener := range listeners {
|
||||
fmt.Printf("%+v\n", listener)
|
||||
}
|
||||
|
||||
binds, err := GetUDP4Table()
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
fmt.Println("\nUDP 4 binds:")
|
||||
for _, bind := range binds {
|
||||
fmt.Printf("%+v\n", bind)
|
||||
}
|
||||
|
||||
binds, err = GetUDP6Table()
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
fmt.Println("\nUDP 6 binds:")
|
||||
for _, bind := range binds {
|
||||
fmt.Printf("%+v\n", bind)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user