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SocketGet support udp and ipv6 #911

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merged 1 commit into from
Mar 29, 2024
Merged

SocketGet support udp and ipv6 #911

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67 changes: 47 additions & 20 deletions socket_linux.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -54,10 +54,8 @@ func (r *socketRequest) Serialize() []byte {
copy(b.Next(16), r.ID.Source)
copy(b.Next(16), r.ID.Destination)
} else {
copy(b.Next(4), r.ID.Source.To4())
b.Next(12)
copy(b.Next(4), r.ID.Destination.To4())
b.Next(12)
copy(b.Next(16), r.ID.Source.To4())
copy(b.Next(16), r.ID.Destination.To4())
}
native.PutUint32(b.Next(4), r.ID.Interface)
native.PutUint32(b.Next(4), r.ID.Cookie[0])
Expand Down Expand Up @@ -117,20 +115,44 @@ func (s *Socket) deserialize(b []byte) error {

// SocketGet returns the Socket identified by its local and remote addresses.
func SocketGet(local, remote net.Addr) (*Socket, error) {
localTCP, ok := local.(*net.TCPAddr)
if !ok {
var protocol uint8
var localIP, remoteIP net.IP
var localPort, remotePort uint16
switch l := local.(type) {
case *net.TCPAddr:
r, ok := remote.(*net.TCPAddr)
if !ok {
return nil, ErrNotImplemented
}
localIP = l.IP
localPort = uint16(l.Port)
remoteIP = r.IP
remotePort = uint16(r.Port)
protocol = unix.IPPROTO_TCP
case *net.UDPAddr:
r, ok := remote.(*net.UDPAddr)
if !ok {
return nil, ErrNotImplemented
}
localIP = l.IP
localPort = uint16(l.Port)
remoteIP = r.IP
remotePort = uint16(r.Port)
protocol = unix.IPPROTO_UDP
default:
return nil, ErrNotImplemented
}
remoteTCP, ok := remote.(*net.TCPAddr)
if !ok {
return nil, ErrNotImplemented

var family uint8
if localIP.To4() != nil && remoteIP.To4() != nil {
family = unix.AF_INET
}
localIP := localTCP.IP.To4()
if localIP == nil {
return nil, ErrNotImplemented

if family == 0 && localIP.To16() != nil && remoteIP.To16() != nil {
family = unix.AF_INET6
}
remoteIP := remoteTCP.IP.To4()
if remoteIP == nil {

if family == 0 {
return nil, ErrNotImplemented
}

Expand All @@ -139,19 +161,24 @@ func SocketGet(local, remote net.Addr) (*Socket, error) {
return nil, err
}
defer s.Close()
req := nl.NewNetlinkRequest(nl.SOCK_DIAG_BY_FAMILY, 0)
req := nl.NewNetlinkRequest(nl.SOCK_DIAG_BY_FAMILY, unix.NLM_F_DUMP)
req.AddData(&socketRequest{
Family: unix.AF_INET,
Protocol: unix.IPPROTO_TCP,
Family: family,
Protocol: protocol,
States: 0xffffffff,
ID: SocketID{
SourcePort: uint16(localTCP.Port),
DestinationPort: uint16(remoteTCP.Port),
SourcePort: localPort,
DestinationPort: remotePort,
Source: localIP,
Destination: remoteIP,
Cookie: [2]uint32{nl.TCPDIAG_NOCOOKIE, nl.TCPDIAG_NOCOOKIE},
},
})
s.Send(req)

if err := s.Send(req); err != nil {
return nil, err
}

msgs, from, err := s.Receive()
if err != nil {
return nil, err
Expand Down
112 changes: 78 additions & 34 deletions socket_test.go
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
//go:build linux
// +build linux

package netlink
Expand All @@ -14,47 +15,90 @@ import (
func TestSocketGet(t *testing.T) {
defer setUpNetlinkTestWithLoopback(t)()

addr, err := net.ResolveTCPAddr("tcp", "localhost:0")
if err != nil {
log.Fatal(err)
type Addr struct {
IP net.IP
Port int
}
l, err := net.ListenTCP("tcp", addr)
if err != nil {
log.Fatal(err)
}
defer l.Close()

conn, err := net.Dial(l.Addr().Network(), l.Addr().String())
if err != nil {
t.Fatal(err)
getAddr := func(a net.Addr) Addr {
var addr Addr
switch v := a.(type) {
case *net.UDPAddr:
addr.IP = v.IP
addr.Port = v.Port
case *net.TCPAddr:
addr.IP = v.IP
addr.Port = v.Port
}
return addr
}
defer conn.Close()

localAddr := conn.LocalAddr().(*net.TCPAddr)
remoteAddr := conn.RemoteAddr().(*net.TCPAddr)
socket, err := SocketGet(localAddr, remoteAddr)
if err != nil {
t.Fatal(err)
}
checkSocket := func(t *testing.T, local, remote net.Addr) {
socket, err := SocketGet(local, remote)
if err != nil {
t.Fatal(err)
}

if got, want := socket.ID.Source, localAddr.IP; !got.Equal(want) {
t.Fatalf("local ip = %v, want %v", got, want)
}
if got, want := socket.ID.Destination, remoteAddr.IP; !got.Equal(want) {
t.Fatalf("remote ip = %v, want %v", got, want)
}
if got, want := int(socket.ID.SourcePort), localAddr.Port; got != want {
t.Fatalf("local port = %d, want %d", got, want)
}
if got, want := int(socket.ID.DestinationPort), remoteAddr.Port; got != want {
t.Fatalf("remote port = %d, want %d", got, want)
localAddr, remoteAddr := getAddr(local), getAddr(remote)

if got, want := socket.ID.Source, localAddr.IP; !got.Equal(want) {
t.Fatalf("local ip = %v, want %v", got, want)
}
if got, want := socket.ID.Destination, remoteAddr.IP; !got.Equal(want) {
t.Fatalf("remote ip = %v, want %v", got, want)
}
if got, want := int(socket.ID.SourcePort), localAddr.Port; got != want {
t.Fatalf("local port = %d, want %d", got, want)
}
if got, want := int(socket.ID.DestinationPort), remoteAddr.Port; got != want {
t.Fatalf("remote port = %d, want %d", got, want)
}
u, err := user.Current()
if err != nil {
t.Fatal(err)
}
if got, want := strconv.Itoa(int(socket.UID)), u.Uid; got != want {
t.Fatalf("UID = %s, want %s", got, want)
}
}
u, err := user.Current()
if err != nil {
t.Fatal(err)

for _, v := range [...]string{"tcp4", "tcp6"} {
addr, err := net.ResolveTCPAddr(v, "localhost:0")
if err != nil {
log.Fatal(err)
}
l, err := net.ListenTCP(v, addr)
if err != nil {
log.Fatal(err)
}
defer l.Close()

conn, err := net.Dial(l.Addr().Network(), l.Addr().String())
if err != nil {
t.Fatal(err)
}
defer conn.Close()

checkSocket(t, conn.LocalAddr(), conn.RemoteAddr())
}
if got, want := strconv.Itoa(int(socket.UID)), u.Uid; got != want {
t.Fatalf("UID = %s, want %s", got, want)

for _, v := range [...]string{"udp4", "udp6"} {
addr, err := net.ResolveUDPAddr(v, "localhost:0")
if err != nil {
log.Fatal(err)
}
l, err := net.ListenUDP(v, addr)
if err != nil {
log.Fatal(err)
}
defer l.Close()
conn, err := net.Dial(l.LocalAddr().Network(), l.LocalAddr().String())
if err != nil {
t.Fatal(err)
}
defer conn.Close()

checkSocket(t, conn.LocalAddr(), conn.RemoteAddr())
}
}

Expand Down
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