net: add UDP listen, resolver, DNSError, and TCP listener APIs for wasm (#63)

* net: add UDP listen, resolver, DNSError, and TCP listener APIs for wasm

TinyGo's net package was missing several symbols that upstream Go's
js/wasm net declares, blocking builds that pull pion/transport, pion/dtls,
and similar (via netbird's WASM client). Add them, backed by the existing
netdev abstraction so they compile for all targets and no-op cleanly under
nopNetdev (matching Go's js runtime behavior):

- DNSError type (dnserror.go), copied from Go 1.26.2.
- Resolver + DefaultResolver with LookupHost/LookupIP/LookupIPAddr/
  LookupNetIP/LookupPort; LookupHost/LookupIP package funcs; Dialer.Resolver
  field for API compatibility.
- UDPConn: ListenUDP, ReadFromUDP(AddrPort), WriteToUDP(AddrPort),
  SetReadBuffer, SetWriteBuffer.
- TCPConn: CloseRead, SetNoDelay, SetReadBuffer, SetWriteBuffer,
  ReadFrom(io.Reader).
- TCPListener: ListenTCP, AcceptTCP, SetDeadline; ListenPacket package func.
- Interface: Addrs, MulticastAddrs stubs.

* more complete PR for adding more net support (#64)

* format unixsock

dial.go

@@ -87,6 +87,13 @@ type Dialer struct {
 	// If KeepAliveConfig.Enable is false and KeepAlive is negative,
 	// keep-alive probes are disabled.
 	KeepAliveConfig KeepAliveConfig
+
+	// Resolver optionally specifies an alternate resolver to use.
+	//
+	// TINYGO: present for API compatibility; DialContext resolves via the
+	// netdev-backed ResolveTCPAddr/ResolveUDPAddr and does not consult this
+	// field.
+	Resolver *Resolver
 }
 
 // Dial connects to the address on the named network.
@@ -281,3 +288,22 @@ func Listen(network, address string) (Listener, error) {
 
 	return listenTCP(laddr)
 }
+
+// ListenPacket announces on the local network address.
+//
+// TINYGO: only UDP networks are supported, backed by ListenUDP; the
+// returned PacketConn is a *UDPConn.
+func ListenPacket(network, address string) (PacketConn, error) {
+	switch network {
+	case "udp", "udp4":
+	default:
+		return nil, fmt.Errorf("Network %s not supported", network)
+	}
+
+	laddr, err := ResolveUDPAddr(network, address)
+	if err != nil {
+		return nil, err
+	}
+
+	return ListenUDP(network, laddr)
+}

dnserror.go

@@ -0,0 +1,47 @@
+// TINYGO: The following is copied and modified from Go 1.26.2 official implementation.
+
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+// DNSError represents a DNS lookup error.
+type DNSError struct {
+	UnwrapErr   error  // error returned by the [DNSError.Unwrap] method, might be nil
+	Err         string // description of the error
+	Name        string // name looked for
+	Server      string // server used
+	IsTimeout   bool   // if true, timed out; not all timeouts set this
+	IsTemporary bool   // if true, error is temporary; not all errors set this
+
+	// IsNotFound is set to true when the requested name does not
+	// contain any records of the requested type (data not found),
+	// or the name itself was not found (NXDOMAIN).
+	IsNotFound bool
+}
+
+// Unwrap returns e.UnwrapErr.
+func (e *DNSError) Unwrap() error { return e.UnwrapErr }
+
+func (e *DNSError) Error() string {
+	if e == nil {
+		return "<nil>"
+	}
+	s := "lookup " + e.Name
+	if e.Server != "" {
+		s += " on " + e.Server
+	}
+	s += ": " + e.Err
+	return s
+}
+
+// Timeout reports whether the DNS lookup is known to have timed out.
+// This is not always known; a DNS lookup may fail due to a timeout
+// and return a [DNSError] for which Timeout returns false.
+func (e *DNSError) Timeout() bool { return e.IsTimeout }
+
+// Temporary reports whether the DNS error is known to be temporary.
+// This is not always known; a DNS lookup may fail due to a temporary
+// error and return a [DNSError] for which Temporary returns false.
+func (e *DNSError) Temporary() bool { return e.IsTimeout || e.IsTemporary }

http/response.go

@@ -14,6 +14,7 @@ package http
 import (
 	"bufio"
 	"bytes"
+	"crypto/tls"
 	"errors"
 	"fmt"
 	"io"
@@ -117,6 +118,11 @@ type Response struct {
 	// Request's Body is nil (having already been consumed).
 	// This is only populated for Client requests.
 	Request *Request
+
+	// TLS contains information about the TLS connection on which the response
+	// was received. It is nil for unencrypted responses. TINYGO: populated only
+	// if a caller sets it; the wasm fetch path leaves it nil.
+	TLS *tls.ConnectionState
 }
 
 // Cookies parses and returns the cookies set in the Set-Cookie headers.

http/responsecontroller.go

@@ -0,0 +1,152 @@
+// TINYGO: Copied verbatim from the Go 1.26.2 official implementation to provide
+// the ResponseController API used by net/http/httputil (reverse proxy). The
+// underlying methods degrade to ErrNotSupported when the ResponseWriter does
+// not implement them, which is the standard behavior.
+
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package http
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"time"
+)
+
+// A ResponseController is used by an HTTP handler to control the response.
+//
+// A ResponseController may not be used after the [Handler.ServeHTTP] method has returned.
+type ResponseController struct {
+	rw ResponseWriter
+}
+
+// NewResponseController creates a [ResponseController] for a request.
+//
+// The ResponseWriter should be the original value passed to the [Handler.ServeHTTP] method,
+// or have an Unwrap method returning the original ResponseWriter.
+//
+// If the ResponseWriter implements any of the following methods, the ResponseController
+// will call them as appropriate:
+//
+//	Flush()
+//	FlushError() error // alternative Flush returning an error
+//	Hijack() (net.Conn, *bufio.ReadWriter, error)
+//	SetReadDeadline(deadline time.Time) error
+//	SetWriteDeadline(deadline time.Time) error
+//	EnableFullDuplex() error
+//
+// If the ResponseWriter does not support a method, ResponseController returns
+// an error matching [ErrNotSupported].
+func NewResponseController(rw ResponseWriter) *ResponseController {
+	return &ResponseController{rw}
+}
+
+type rwUnwrapper interface {
+	Unwrap() ResponseWriter
+}
+
+// Flush flushes buffered data to the client.
+func (c *ResponseController) Flush() error {
+	rw := c.rw
+	for {
+		switch t := rw.(type) {
+		case interface{ FlushError() error }:
+			return t.FlushError()
+		case Flusher:
+			t.Flush()
+			return nil
+		case rwUnwrapper:
+			rw = t.Unwrap()
+		default:
+			return errNotSupported()
+		}
+	}
+}
+
+// Hijack lets the caller take over the connection.
+// See the [Hijacker] interface for details.
+func (c *ResponseController) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	rw := c.rw
+	for {
+		switch t := rw.(type) {
+		case Hijacker:
+			return t.Hijack()
+		case rwUnwrapper:
+			rw = t.Unwrap()
+		default:
+			return nil, nil, errNotSupported()
+		}
+	}
+}
+
+// SetReadDeadline sets the deadline for reading the entire request, including the body.
+// Reads from the request body after the deadline has been exceeded will return an error.
+// A zero value means no deadline.
+//
+// Setting the read deadline after it has been exceeded will not extend it.
+func (c *ResponseController) SetReadDeadline(deadline time.Time) error {
+	rw := c.rw
+	for {
+		switch t := rw.(type) {
+		case interface{ SetReadDeadline(time.Time) error }:
+			return t.SetReadDeadline(deadline)
+		case rwUnwrapper:
+			rw = t.Unwrap()
+		default:
+			return errNotSupported()
+		}
+	}
+}
+
+// SetWriteDeadline sets the deadline for writing the response.
+// Writes to the response body after the deadline has been exceeded will not block,
+// but may succeed if the data has been buffered.
+// A zero value means no deadline.
+//
+// Setting the write deadline after it has been exceeded will not extend it.
+func (c *ResponseController) SetWriteDeadline(deadline time.Time) error {
+	rw := c.rw
+	for {
+		switch t := rw.(type) {
+		case interface{ SetWriteDeadline(time.Time) error }:
+			return t.SetWriteDeadline(deadline)
+		case rwUnwrapper:
+			rw = t.Unwrap()
+		default:
+			return errNotSupported()
+		}
+	}
+}
+
+// EnableFullDuplex indicates that the request handler will interleave reads from [Request.Body]
+// with writes to the [ResponseWriter].
+//
+// For HTTP/1 requests, the Go HTTP server by default consumes any unread portion of
+// the request body before beginning to write the response, preventing handlers from
+// concurrently reading from the request and writing the response.
+// Calling EnableFullDuplex disables this behavior and permits handlers to continue to read
+// from the request while concurrently writing the response.
+//
+// For HTTP/2 requests, the Go HTTP server always permits concurrent reads and responses.
+func (c *ResponseController) EnableFullDuplex() error {
+	rw := c.rw
+	for {
+		switch t := rw.(type) {
+		case interface{ EnableFullDuplex() error }:
+			return t.EnableFullDuplex()
+		case rwUnwrapper:
+			rw = t.Unwrap()
+		default:
+			return errNotSupported()
+		}
+	}
+}
+
+// errNotSupported returns an error that Is ErrNotSupported,
+// but is not == to it.
+func errNotSupported() error {
+	return fmt.Errorf("%w", ErrNotSupported)
+}

http/server.go

@@ -2779,6 +2779,23 @@ type Server struct {
 	// value.
 	ConnContext func(ctx context.Context, c net.Conn) context.Context
 
+	// TLSNextProto optionally specifies a function to take over
+	// ownership of the provided TLS connection when an ALPN
+	// protocol upgrade has occurred. The map key is the protocol
+	// name negotiated. The Handler argument should be used to
+	// handle HTTP requests and will initialize the Request's TLS
+	// and RemoteAddr if not already set. The connection is
+	// automatically closed when the function returns.
+	// If TLSNextProto is not nil, HTTP/2 support is not enabled
+	// automatically.
+	TLSNextProto map[string]func(*Server, *tls.Conn, Handler)
+
+	// HTTP2 configures HTTP/2 connections.
+	//
+	// This field does not yet have any effect.
+	// See https://go.dev/issue/67813.
+	HTTP2 *HTTP2Config
+
 	inShutdown atomicBool // true when server is in shutdown
 
 	disableKeepAlives int32     // accessed atomically.

http/transport.go

@@ -12,8 +12,14 @@
 package http
 
 import (
+	"context"
+	"crypto/tls"
+	"errors"
 	"io"
+	"net"
+	"net/url"
 	"sync/atomic"
+	"time"
 )
 
 type readTrackingBody struct {
@@ -22,6 +28,106 @@ type readTrackingBody struct {
 	didClose atomic.Bool
 }
 
-type Transport struct{}
+// Transport is an HTTP/1.x RoundTripper. TINYGO: in the wasm/browser build the
+// actual round trips are performed by the host fetch API (see roundtrip_js.go);
+// these fields exist only to satisfy configuration by callers such as
+// golang.org/x/net/http2 and google.golang.org/grpc. They are stored but, aside
+// from fetch, have no effect at runtime.
+type Transport struct {
+	// TLSClientConfig specifies the TLS configuration to use with tls.Client.
+	TLSClientConfig *tls.Config
+
+	// TLSNextProto specifies how the Transport switches to an alternate
+	// protocol (such as HTTP/2) after a TLS ALPN protocol negotiation.
+	TLSNextProto map[string]func(authority string, c *tls.Conn) RoundTripper
+
+	// DisableKeepAlives, if true, disables HTTP keep-alives.
+	DisableKeepAlives bool
+
+	// DisableCompression, if true, prevents the Transport from requesting
+	// compression with an "Accept-Encoding: gzip" request header.
+	DisableCompression bool
+
+	// IdleConnTimeout is the maximum amount of time an idle connection will
+	// remain idle before closing itself. Zero means no limit.
+	IdleConnTimeout time.Duration
+
+	// ResponseHeaderTimeout, if non-zero, specifies the amount of time to wait
+	// for a server's response headers after fully writing the request.
+	ResponseHeaderTimeout time.Duration
+
+	// ExpectContinueTimeout, if non-zero, specifies the amount of time to wait
+	// for a server's first response headers after fully writing the request
+	// headers if the request has an "Expect: 100-continue" header.
+	ExpectContinueTimeout time.Duration
+
+	// MaxResponseHeaderBytes specifies a limit on how many response bytes are
+	// allowed in the server's response header. Zero means to use a default limit.
+	MaxResponseHeaderBytes int64
+
+	// MaxIdleConns controls the maximum number of idle (keep-alive) connections
+	// across all hosts. Zero means no limit.
+	MaxIdleConns int
+
+	// MaxIdleConnsPerHost, if non-zero, controls the maximum idle (keep-alive)
+	// connections to keep per-host.
+	MaxIdleConnsPerHost int
+
+	// MaxConnsPerHost optionally limits the total number of connections per host.
+	MaxConnsPerHost int
+
+	// HTTP2 configures HTTP/2 connections. This field does not yet have any effect.
+	HTTP2 *HTTP2Config
+
+	// Dial specifies the dial function for creating unencrypted TCP connections.
+	//
+	// Deprecated: Use DialContext instead. TINYGO: stored only; unused by the
+	// fetch-based round tripper.
+	Dial func(network, addr string) (net.Conn, error)
+
+	// DialContext specifies the dial function for creating unencrypted TCP
+	// connections. TINYGO: honored by callers that dial through the Transport
+	// directly (e.g. the relay WebSocket transport), which is how netbird routes
+	// connections through the netstack in the browser.
+	DialContext func(ctx context.Context, network, addr string) (net.Conn, error)
+}
 
 var DefaultTransport RoundTripper = &Transport{}
+
+// CloseIdleConnections closes any connections which were previously connected
+// from previous requests but are now sitting idle. TINYGO: no-op.
+func (t *Transport) CloseIdleConnections() {}
+
+// Clone returns a copy of t with its exported fields shared. TINYGO: the
+// tinygo Transport carries only configuration (round trips go through the host
+// fetch API), so a shallow struct copy with duplicated maps is sufficient.
+func (t *Transport) Clone() *Transport {
+	t2 := *t
+	if t.TLSClientConfig != nil {
+		t2.TLSClientConfig = t.TLSClientConfig.Clone()
+	}
+	if t.TLSNextProto != nil {
+		npm := make(map[string]func(authority string, c *tls.Conn) RoundTripper, len(t.TLSNextProto))
+		for k, v := range t.TLSNextProto {
+			npm[k] = v
+		}
+		t2.TLSNextProto = npm
+	}
+	return &t2
+}
+
+// ProxyFromEnvironment returns the URL of the proxy to use for a given request.
+// TINYGO: the wasm build has no environment proxy configuration, so this always
+// reports "no proxy" (nil URL, nil error), which callers treat as a direct
+// connection.
+func ProxyFromEnvironment(req *Request) (*url.URL, error) {
+	return nil, nil
+}
+
+// ErrSkipAltProtocol is a sentinel error value defined by Transport.RegisterProtocol.
+var ErrSkipAltProtocol = errors.New("net/http: skip alternate protocol")
+
+// RegisterProtocol registers a new protocol with scheme. TINYGO: no-op; the
+// wasm build performs round trips via the host fetch API and does not dispatch
+// on registered alternate protocols.
+func (t *Transport) RegisterProtocol(scheme string, rt RoundTripper) {}

interface.go

@@ -35,6 +35,22 @@ type Interface struct {
 	Flags        Flags        // e.g., FlagUp, FlagLoopback, FlagMulticast
 }
 
+// Addrs returns a list of unicast interface addresses for a specific
+// interface.
+//
+// TINYGO: not implemented; netdev exposes no per-interface address list.
+func (ifi *Interface) Addrs() ([]Addr, error) {
+	return nil, errors.New("Interface.Addrs not implemented")
+}
+
+// MulticastAddrs returns a list of multicast, joined group addresses
+// for a specific interface.
+//
+// TINYGO: not implemented; netdev exposes no per-interface address list.
+func (ifi *Interface) MulticastAddrs() ([]Addr, error) {
+	return nil, errors.New("Interface.MulticastAddrs not implemented")
+}
+
 type Flags uint
 
 const (
@@ -93,3 +109,8 @@ func InterfaceAddrs() ([]Addr, error) {
 func InterfaceByIndex(index int) (*Interface, error) {
 	return nil, errors.New("InterfaceByIndex not implemented")
 }
+
+// InterfaceByName returns the interface specified by name.
+func InterfaceByName(name string) (*Interface, error) {
+	return nil, errors.New("InterfaceByName not implemented")
+}

lookup.go

@@ -7,13 +7,145 @@
 package net
 
 import (
+	"context"
 	"errors"
+	"net/netip"
 )
 
+// A Resolver looks up names and numbers.
+//
+// A nil *Resolver is equivalent to a zero Resolver.
+//
+// TINYGO: name resolution is backed by the netdev GetHostByName hook;
+// the PreferGo/StrictErrors/Dial fields exist for API compatibility with
+// upstream Go and are ignored.
+type Resolver struct {
+	// PreferGo controls whether Go's built-in DNS resolver is preferred
+	// on platforms where it's available. It is equivalent to setting
+	// GODEBUG=netdns=go, but scoped to just this resolver.
+	PreferGo bool
+
+	// StrictErrors controls the behavior of temporary errors
+	// (including timeout, socket errors, and SERVFAIL) when using
+	// Go's built-in resolver.
+	StrictErrors bool
+
+	// Dial optionally specifies an alternate dialer for use by
+	// Go's built-in DNS resolver to make TCP and UDP connections
+	// to DNS services.
+	Dial func(ctx context.Context, network, address string) (Conn, error)
+}
+
+// DefaultResolver is the resolver used by the package-level Lookup
+// functions and by Dialers without a specified Resolver.
+var DefaultResolver = &Resolver{}
+
+// LookupHost looks up the given host using the local resolver.
+// It returns a slice of that host's addresses.
+//
+// LookupHost uses [context.Background] internally; to specify the context, use
+// [Resolver.LookupHost].
+func LookupHost(host string) (addrs []string, err error) {
+	return DefaultResolver.LookupHost(context.Background(), host)
+}
+
+// LookupHost looks up the given host using the local resolver.
+// It returns a slice of that host's addresses.
+//
+// TINYGO: resolves via netdev.GetHostByName, returning at most one address.
+func (r *Resolver) LookupHost(ctx context.Context, host string) (addrs []string, err error) {
+	if host == "" {
+		return nil, &DNSError{Err: errNoSuchHost.Error(), Name: host, IsNotFound: true}
+	}
+	ip, err := netdev.GetHostByName(host)
+	if err != nil {
+		return nil, &DNSError{Err: err.Error(), Name: host}
+	}
+	return []string{ip.String()}, nil
+}
+
+// LookupIP looks up host using the local resolver.
+// It returns a slice of that host's IPv4 and IPv6 addresses.
+func LookupIP(host string) ([]IP, error) {
+	addrs, err := DefaultResolver.LookupIPAddr(context.Background(), host)
+	if err != nil {
+		return nil, err
+	}
+	ips := make([]IP, 0, len(addrs))
+	for _, addr := range addrs {
+		ips = append(ips, addr.IP)
+	}
+	return ips, nil
+}
+
+// LookupIPAddr looks up host using the local resolver.
+// It returns a slice of that host's IPv4 and IPv6 addresses.
+//
+// TINYGO: resolves via netdev.GetHostByName, returning at most one address.
+func (r *Resolver) LookupIPAddr(ctx context.Context, host string) ([]IPAddr, error) {
+	if host == "" {
+		return nil, &DNSError{Err: errNoSuchHost.Error(), Name: host, IsNotFound: true}
+	}
+	ip, err := netdev.GetHostByName(host)
+	if err != nil {
+		return nil, &DNSError{Err: err.Error(), Name: host}
+	}
+	return []IPAddr{{IP: ip.AsSlice(), Zone: ip.Zone()}}, nil
+}
+
+// LookupNetIP looks up host using the local resolver.
+// It returns a slice of that host's IP addresses of the type specified by
+// network. The network must be one of "ip", "ip4" or "ip6".
+//
+// TINYGO: resolves via netdev.GetHostByName, returning at most one address.
+func (r *Resolver) LookupNetIP(ctx context.Context, network, host string) ([]netip.Addr, error) {
+	if host == "" {
+		return nil, &DNSError{Err: errNoSuchHost.Error(), Name: host, IsNotFound: true}
+	}
+	ip, err := netdev.GetHostByName(host)
+	if err != nil {
+		return nil, &DNSError{Err: err.Error(), Name: host}
+	}
+	return []netip.Addr{ip}, nil
+}
+
 // LookupPort looks up the port for the given network and service.
 //
 // LookupPort uses [context.Background] internally; to specify the context, use
 // [Resolver.LookupPort].
 func LookupPort(network, service string) (port int, err error) {
+	return DefaultResolver.LookupPort(context.Background(), network, service)
+}
+
+// LookupPort looks up the port for the given network and service.
+//
+// TINYGO: not implemented; netdev provides no service database.
+func (r *Resolver) LookupPort(ctx context.Context, network, service string) (port int, err error) {
 	return 0, errors.New("net:LookupPort not implemented")
 }
+
+// An SRV represents a single DNS SRV record.
+type SRV struct {
+	Target   string
+	Port     uint16
+	Priority uint16
+	Weight   uint16
+}
+
+// LookupSRV tries to resolve an SRV query of the given service, protocol, and
+// domain name.
+//
+// TINYGO: not implemented; netdev provides no SRV record lookup.
+func (r *Resolver) LookupSRV(ctx context.Context, service, proto, name string) (string, []*SRV, error) {
+	return "", nil, errors.New("net:LookupSRV not implemented")
+}
+
+// LookupTXT returns the DNS TXT records for the given domain name.
+//
+// TINYGO: not implemented; netdev provides no TXT record lookup.
+func (r *Resolver) LookupTXT(ctx context.Context, name string) ([]string, error) {
+	return nil, errors.New("net:LookupTXT not implemented")
+}
+
+// errNoSuchHost is returned when the host lookup finds no matching records.
+var errNoSuchHost = errors.New("no such host")

tcpsock.go

@@ -296,6 +296,61 @@ func (c *TCPConn) CloseWrite() error {
 	return fmt.Errorf("CloseWrite not implemented")
 }
 
+// CloseRead shuts down the reading side of the TCP connection.
+// Most callers should just use Close.
+//
+// TINYGO: no-op; netdev has no half-close, reads simply stop when Close
+// is called.
+func (c *TCPConn) CloseRead() error {
+	return nil
+}
+
+// SetNoDelay controls whether the operating system should delay
+// packet transmission in hopes of sending fewer packets (Nagle's
+// algorithm). The default is true (no delay), meaning that data is
+// sent as soon as possible after a Write.
+//
+// TINYGO: no-op; Nagle behavior is managed by the netdev driver.
+func (c *TCPConn) SetNoDelay(noDelay bool) error {
+	return nil
+}
+
+// SetReadBuffer sets the size of the operating system's receive buffer
+// associated with the connection.
+//
+// TINYGO: no-op; buffer sizing is managed by the netdev driver.
+func (c *TCPConn) SetReadBuffer(bytes int) error {
+	return nil
+}
+
+// SetWriteBuffer sets the size of the operating system's transmit buffer
+// associated with the connection.
+//
+// TINYGO: no-op; buffer sizing is managed by the netdev driver.
+func (c *TCPConn) SetWriteBuffer(bytes int) error {
+	return nil
+}
+
+// ReadFrom implements the io.ReaderFrom ReadFrom method.
+//
+// TINYGO: generic copy loop over Write; no zero-copy sendfile path.
+func (c *TCPConn) ReadFrom(r io.Reader) (int64, error) {
+	return genericReadFrom(c, r)
+}
+
+// genericReadFrom copies from r into w until EOF, returning the number
+// of bytes copied.
+func genericReadFrom(w io.Writer, r io.Reader) (int64, error) {
+	// Wrap w to hide its ReadFrom method, so io.Copy uses the generic
+	// read/write loop instead of recursing back into TCPConn.ReadFrom.
+	return io.Copy(onlyWriter{w}, r)
+}
+
+// onlyWriter hides w's ReadFrom method from io.Copy.
+type onlyWriter struct {
+	io.Writer
+}
+
 type listener struct {
 	fd    int
 	laddr *TCPAddr
@@ -348,3 +403,63 @@ func listenTCP(laddr *TCPAddr) (Listener, error) {
 type TCPListener struct {
 	listener
 }
+
+// ListenTCP acts like [Listen] for TCP networks.
+//
+// The network must be a TCP network name; see func [Dial] for details.
+// If the IP field of laddr is nil or an unspecified IP address,
+// ListenTCP listens on all available unicast and anycast IP addresses
+// of the local system. If the Port field of laddr is 0, a port number
+// is automatically chosen.
+func ListenTCP(network string, laddr *TCPAddr) (*TCPListener, error) {
+	switch network {
+	case "tcp", "tcp4":
+	default:
+		return nil, fmt.Errorf("Network '%s' not supported", network)
+	}
+
+	if laddr == nil {
+		laddr = &TCPAddr{}
+	}
+
+	fd, err := netdev.Socket(_AF_INET, _SOCK_STREAM, _IPPROTO_TCP)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = netdev.Bind(fd, laddr.AddrPort()); err != nil {
+		netdev.Close(fd)
+		return nil, err
+	}
+
+	if err = netdev.Listen(fd, 5); err != nil {
+		netdev.Close(fd)
+		return nil, err
+	}
+
+	return &TCPListener{listener{fd: fd, laddr: laddr}}, nil
+}
+
+// AcceptTCP accepts the next incoming call and returns the new
+// connection.
+func (l *TCPListener) AcceptTCP() (*TCPConn, error) {
+	fd, raddr, err := netdev.Accept(l.fd)
+	if err != nil {
+		return nil, err
+	}
+
+	return &TCPConn{
+		fd:    fd,
+		net:   "tcp",
+		laddr: l.laddr,
+		raddr: TCPAddrFromAddrPort(raddr),
+	}, nil
+}
+
+// SetDeadline sets the deadline associated with the listener.
+// A zero time value disables the deadline.
+//
+// TINYGO: no-op; netdev.Accept has no deadline support.
+func (l *TCPListener) SetDeadline(t time.Time) error {
+	return nil
+}

tlssock.go

@@ -9,6 +9,7 @@
 package net
 
 import (
+	"context"
 	"internal/itoa"
 	"io"
 	"net/netip"
@@ -139,3 +140,10 @@ func (c *TLSConn) Handshake() error {
 	panic("TLSConn.Handshake() not implemented")
 	return nil
 }
+
+// HandshakeContext runs the client or server handshake protocol if it has not
+// yet been run. TINYGO: TLS is offloaded to the network device; this exists to
+// satisfy callers (e.g. pion/ice) that require the context-aware variant.
+func (c *TLSConn) HandshakeContext(ctx context.Context) error {
+	return c.Handshake()
+}

udpsock.go

@@ -210,6 +210,53 @@ func DialUDP(network string, laddr, raddr *UDPAddr) (*UDPConn, error) {
 	}, nil
 }
 
+// ListenUDP acts like [ListenPacket] for UDP networks.
+//
+// The network must be a UDP network name; see func [Dial] for details.
+//
+// If the IP field of laddr is nil or an unspecified IP address,
+// ListenUDP listens on all available IP addresses of the local system
+// except multicast IP addresses.
+// If the Port field of laddr is 0, a port number is automatically
+// chosen.
+func ListenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
+	switch network {
+	case "udp", "udp4":
+	default:
+		return nil, fmt.Errorf("Network '%s' not supported", network)
+	}
+
+	// TINYGO: Use netdev to create UDP socket and bind (no connect)
+
+	if laddr == nil {
+		laddr = &UDPAddr{}
+	}
+
+	// If no port was given, grab an ephemeral port
+	if laddr.Port == 0 {
+		laddr.Port = ephemeralPort()
+	}
+
+	fd, err := netdev.Socket(_AF_INET, _SOCK_DGRAM, _IPPROTO_UDP)
+	if err != nil {
+		return nil, err
+	}
+
+	lip, _ := netip.AddrFromSlice(laddr.IP)
+	laddrport := netip.AddrPortFrom(lip, uint16(laddr.Port))
+
+	if err = netdev.Bind(fd, laddrport); err != nil {
+		netdev.Close(fd)
+		return nil, err
+	}
+
+	return &UDPConn{
+		fd:    fd,
+		net:   network,
+		laddr: laddr,
+	}, nil
+}
+
 // SyscallConn returns a raw network connection.
 // This implements the syscall.Conn interface.
 func (c *UDPConn) SyscallConn() (syscall.RawConn, error) {
@@ -242,6 +289,66 @@ func (c *UDPConn) Write(b []byte) (int, error) {
 	return n, err
 }
 
+// ReadFromUDP acts like [UDPConn.ReadFrom] but returns a [UDPAddr].
+//
+// TINYGO: netdev has no per-datagram source address, so the connected
+// remote address (c.raddr) is returned as the source.
+func (c *UDPConn) ReadFromUDP(b []byte) (int, *UDPAddr, error) {
+	n, err := netdev.Recv(c.fd, b, 0, c.readDeadline)
+	if n < 0 {
+		n = 0
+	}
+	if err != nil && err != io.EOF {
+		err = &OpError{Op: "read", Net: c.net, Source: c.laddr, Addr: c.raddr, Err: err}
+	}
+	return n, c.raddr, err
+}
+
+// ReadFromUDPAddrPort acts like [UDPConn.ReadFromUDP] but returns a [netip.AddrPort].
+func (c *UDPConn) ReadFromUDPAddrPort(b []byte) (n int, addr netip.AddrPort, err error) {
+	n, uaddr, err := c.ReadFromUDP(b)
+	if uaddr != nil {
+		addr = uaddr.AddrPort()
+	}
+	return n, addr, err
+}
+
+// WriteToUDP acts like [UDPConn.WriteTo] but takes a [UDPAddr].
+//
+// TINYGO: the socket is connected via netdev, so writes go to the
+// connected remote regardless of addr, mirroring netdev.Send.
+func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
+	n, err := netdev.Send(c.fd, b, 0, c.writeDeadline)
+	if n < 0 {
+		n = 0
+	}
+	if err != nil {
+		err = &OpError{Op: "write", Net: c.net, Source: c.laddr, Addr: addr.opAddr(), Err: err}
+	}
+	return n, err
+}
+
+// WriteToUDPAddrPort acts like [UDPConn.WriteToUDP] but takes a [netip.AddrPort].
+func (c *UDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
+	return c.WriteToUDP(b, UDPAddrFromAddrPort(addr))
+}
+
+// SetReadBuffer sets the size of the operating system's receive buffer
+// associated with the connection.
+//
+// TINYGO: no-op; buffer sizing is managed by the netdev driver.
+func (c *UDPConn) SetReadBuffer(bytes int) error {
+	return nil
+}
+
+// SetWriteBuffer sets the size of the operating system's transmit buffer
+// associated with the connection.
+//
+// TINYGO: no-op; buffer sizing is managed by the netdev driver.
+func (c *UDPConn) SetWriteBuffer(bytes int) error {
+	return nil
+}
+
 // ReadFrom implements the PacketConn ReadFrom method.
 func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
 	return 0, nil, errors.New("ReadFrom not implemented")

unixsock.go

@@ -6,6 +6,11 @@
 
 package net
 
+import (
+	"errors"
+	"time"
+)
+
 // BUG(mikio): On JS, WASIP1 and Plan 9, methods and functions related
 // to UnixConn and UnixListener are not implemented.
 
@@ -44,6 +49,33 @@ func (a *UnixAddr) opAddr() Addr {
 	return a
 }
 
+// UnixConn is an implementation of the Conn interface for connections to Unix
+// domain sockets.
+//
+// TINYGO: Unix sockets are not implemented (the browser has no filesystem
+// sockets). This type exists only to satisfy references and type assertions
+// such as those in github.com/gliderlabs/ssh agent forwarding; all methods
+// return an error. The corresponding code paths are never reached at runtime in
+// the wasm build.
+type UnixConn struct {
+	fd    int
+	laddr *UnixAddr
+	raddr *UnixAddr
+}
+
+var errUnixNotImplemented = errors.New("net: Unix sockets not implemented")
+
+func (c *UnixConn) Read(b []byte) (int, error)         { return 0, errUnixNotImplemented }
+func (c *UnixConn) Write(b []byte) (int, error)        { return 0, errUnixNotImplemented }
+func (c *UnixConn) Close() error                       { return errUnixNotImplemented }
+func (c *UnixConn) CloseRead() error                   { return errUnixNotImplemented }
+func (c *UnixConn) CloseWrite() error                  { return errUnixNotImplemented }
+func (c *UnixConn) LocalAddr() Addr                    { return c.laddr }
+func (c *UnixConn) RemoteAddr() Addr                   { return c.raddr }
+func (c *UnixConn) SetDeadline(t time.Time) error      { return errUnixNotImplemented }
+func (c *UnixConn) SetReadDeadline(t time.Time) error  { return errUnixNotImplemented }
+func (c *UnixConn) SetWriteDeadline(t time.Time) error { return errUnixNotImplemented }
+
 // ResolveUnixAddr returns an address of Unix domain socket end point.
 //
 // The network must be a Unix network name.