chore: upgrade dependencies

This adds a new interface for httpu that supports a Context, and uses
that context to set a deadline/timeout and also cancel the request if
the context is canceled. Additionally, add a new method to the SSDP
package that takes a ClientInterfaceCtx.

Updates #55

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>

go.mod

@@ -1,5 +1,5 @@
 module git.cyrilix.bzh/cyrilix/goupnp
 
-go 1.19
+go 1.22
 
-require golang.org/x/sync v0.1.0
+require golang.org/x/sync v0.7.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
-golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=

go.work

@@ -1,4 +1,6 @@
-go 1.18
+go 1.22
+
+toolchain go1.22.5
 
 use (
 	.

go.work.sum

@@ -0,0 +1,6 @@
+golang.org/x/mod v0.6.0 h1:b9gGHsz9/HhJ3HF5DHQytPpuwocVTChQJK3AvoLRD5I=
+golang.org/x/mod v0.6.0/go.mod h1:4mET923SAdbXp2ki8ey+zGs1SLqsuM2Y0uvdZR/fUNI=
+golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/tools v0.2.0 h1:G6AHpWxTMGY1KyEYoAQ5WTtIekUUvDNjan3ugu60JvE=
+golang.org/x/tools v0.2.0/go.mod h1:y4OqIKeOV/fWJetJ8bXPU1sEVniLMIyDAZWeHdV+NTA=

goupnp.go

@@ -85,7 +85,10 @@ func DiscoverDevicesCtx(ctx context.Context, searchTarget string) ([]MaybeRootDe
 		return nil, err
 	}
 	defer hcCleanup()
-	responses, err := ssdp.SSDPRawSearchCtx(ctx, hc, string(searchTarget), 2, 3)
+
+	searchCtx, cancel := context.WithTimeout(ctx, 2*time.Second)
+	defer cancel()
+	responses, err := ssdp.RawSearch(searchCtx, hc, string(searchTarget), 3)
 	if err != nil {
 		return nil, err
 	}
@@ -148,6 +151,10 @@ func DeviceByURL(loc *url.URL) (*RootDevice, error) {
 // but should not be changed after requesting clients.
 var CharsetReaderDefault func(charset string, input io.Reader) (io.Reader, error)
 
+// HTTPClient specifies the http.Client object used when fetching the XML from the UPnP server.
+// HTTPClient defaults the http.DefaultClient.  This may be overridden by the importing application.
+var HTTPClientDefault = http.DefaultClient
+
 func requestXml(ctx context.Context, url string, defaultSpace string, doc interface{}) error {
 	ctx, cancel := context.WithTimeout(ctx, 3*time.Second)
 	defer cancel()
@@ -157,7 +164,7 @@ func requestXml(ctx context.Context, url string, defaultSpace string, doc interf
 		return err
 	}
 
-	resp, err := http.DefaultClient.Do(req)
+	resp, err := HTTPClientDefault.Do(req)
 	if err != nil {
 		return err
 	}

httpu/httpu.go

@@ -3,6 +3,7 @@ package httpu
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"errors"
 	"fmt"
 	"log"
@@ -26,6 +27,27 @@ type ClientInterface interface {
 	) ([]*http.Response, error)
 }
 
+// ClientInterfaceCtx is the equivalent of ClientInterface, except with methods
+// taking a context.Context parameter.
+type ClientInterfaceCtx interface {
+	// DoWithContext performs a request. If the input request has a
+	// deadline, then that value will be used as the timeout for how long
+	// to wait before returning the responses that were received. If the
+	// request's context is canceled, this method will return immediately.
+	//
+	// If the request's context is never canceled, and does not have a
+	// deadline, then this function WILL NEVER RETURN. You MUST set an
+	// appropriate deadline on the context, or otherwise cancel it when you
+	// want to finish an operation.
+	//
+	// An error is only returned for failing to send the request. Failures
+	// in receipt simply do not add to the resulting responses.
+	DoWithContext(
+		req *http.Request,
+		numSends int,
+	) ([]*http.Response, error)
+}
+
 // HTTPUClient is a client for dealing with HTTPU (HTTP over UDP). Its typical
 // function is for HTTPMU, and particularly SSDP.
 type HTTPUClient struct {
@@ -34,6 +56,7 @@ type HTTPUClient struct {
 }
 
 var _ ClientInterface = &HTTPUClient{}
+var _ ClientInterfaceCtx = &HTTPUClient{}
 
 // NewHTTPUClient creates a new HTTPUClient, opening up a new UDP socket for the
 // purpose.
@@ -75,6 +98,25 @@ func (httpu *HTTPUClient) Do(
 	req *http.Request,
 	timeout time.Duration,
 	numSends int,
+) ([]*http.Response, error) {
+	ctx := req.Context()
+	if timeout > 0 {
+		var cancel func()
+		ctx, cancel = context.WithTimeout(ctx, timeout)
+		defer cancel()
+		req = req.WithContext(ctx)
+	}
+
+	return httpu.DoWithContext(req, numSends)
+}
+
+// DoWithContext implements ClientInterfaceCtx.DoWithContext.
+//
+// Make sure to read the documentation on the ClientInterfaceCtx interface
+// regarding cancellation!
+func (httpu *HTTPUClient) DoWithContext(
+	req *http.Request,
+	numSends int,
 ) ([]*http.Response, error) {
 	httpu.connLock.Lock()
 	defer httpu.connLock.Unlock()
@@ -101,10 +143,28 @@ func (httpu *HTTPUClient) Do(
 	if err != nil {
 		return nil, err
 	}
-	if err = httpu.conn.SetDeadline(time.Now().Add(timeout)); err != nil {
-		return nil, err
+
+	// Handle context deadline/timeout
+	ctx := req.Context()
+	deadline, ok := ctx.Deadline()
+	if ok {
+		if err = httpu.conn.SetDeadline(deadline); err != nil {
+			return nil, err
+		}
 	}
 
+	// Handle context cancelation
+	done := make(chan struct{})
+	defer close(done)
+	go func() {
+		select {
+		case <-ctx.Done():
+			// if context is cancelled, stop any connections by setting time in the past.
+			httpu.conn.SetDeadline(time.Now().Add(-time.Second))
+		case <-done:
+		}
+	}()
+
 	// Send request.
 	for i := 0; i < numSends; i++ {
 		if n, err := httpu.conn.WriteTo(requestBuf.Bytes(), destAddr); err != nil {

httpu/multiclient.go

@@ -49,14 +49,14 @@ func (mc *MultiClient) Do(
 }
 
 func (mc *MultiClient) sendRequests(
-	results chan<-[]*http.Response,
+	results chan<- []*http.Response,
 	req *http.Request,
 	timeout time.Duration,
 	numSends int,
 ) error {
 	tasks := &errgroup.Group{}
 	for _, d := range mc.delegates {
-		d := d  // copy for closure
+		d := d // copy for closure
 		tasks.Go(func() error {
 			responses, err := d.Do(req, timeout, numSends)
 			if err != nil {
@@ -68,3 +68,65 @@ func (mc *MultiClient) sendRequests(
 	}
 	return tasks.Wait()
 }
+
+// MultiClientCtx dispatches requests out to all the delegated clients.
+type MultiClientCtx struct {
+	// The HTTPU clients to delegate to.
+	delegates []ClientInterfaceCtx
+}
+
+var _ ClientInterfaceCtx = &MultiClientCtx{}
+
+// NewMultiClient creates a new MultiClient that delegates to all the given
+// clients.
+func NewMultiClientCtx(delegates []ClientInterfaceCtx) *MultiClientCtx {
+	return &MultiClientCtx{
+		delegates: delegates,
+	}
+}
+
+// DoWithContext implements ClientInterfaceCtx.DoWithContext.
+func (mc *MultiClientCtx) DoWithContext(
+	req *http.Request,
+	numSends int,
+) ([]*http.Response, error) {
+	tasks, ctx := errgroup.WithContext(req.Context())
+	req = req.WithContext(ctx) // so we cancel if the errgroup errors
+	results := make(chan []*http.Response)
+
+	// For each client, send the request to it and collect results.
+	tasks.Go(func() error {
+		defer close(results)
+		return mc.sendRequestsCtx(results, req, numSends)
+	})
+
+	var responses []*http.Response
+	tasks.Go(func() error {
+		for rs := range results {
+			responses = append(responses, rs...)
+		}
+		return nil
+	})
+
+	return responses, tasks.Wait()
+}
+
+func (mc *MultiClientCtx) sendRequestsCtx(
+	results chan<- []*http.Response,
+	req *http.Request,
+	numSends int,
+) error {
+	tasks := &errgroup.Group{}
+	for _, d := range mc.delegates {
+		d := d // copy for closure
+		tasks.Go(func() error {
+			responses, err := d.DoWithContext(req, numSends)
+			if err != nil {
+				return err
+			}
+			results <- responses
+			return nil
+		})
+	}
+	return tasks.Wait()
+}

httpu/serve.go

@@ -7,6 +7,7 @@ import (
 	"net"
 	"net/http"
 	"regexp"
+	"sync"
 )
 
 const (
@@ -73,20 +74,25 @@ func (srv *Server) Serve(l net.PacketConn) error {
 	if srv.MaxMessageBytes != 0 {
 		maxMessageBytes = srv.MaxMessageBytes
 	}
+
+	bufPool := &sync.Pool{
+		New: func() interface{} {
+			return make([]byte, maxMessageBytes)
+		},
+	}
 	for {
-		buf := make([]byte, maxMessageBytes)
+		buf := bufPool.Get().([]byte)
 		n, peerAddr, err := l.ReadFrom(buf)
 		if err != nil {
 			return err
 		}
-		buf = buf[:n]
-
-		go func(buf []byte, peerAddr net.Addr) {
+		go func() {
+			defer bufPool.Put(buf)
 			// At least one router's UPnP implementation has added a trailing space
 			// after "HTTP/1.1" - trim it.
-			buf = trailingWhitespaceRx.ReplaceAllLiteral(buf, crlf)
+			reqBuf := trailingWhitespaceRx.ReplaceAllLiteral(buf[:n], crlf)
 
-			req, err := http.ReadRequest(bufio.NewReader(bytes.NewBuffer(buf)))
+			req, err := http.ReadRequest(bufio.NewReader(bytes.NewBuffer(reqBuf)))
 			if err != nil {
 				log.Printf("httpu: Failed to parse request: %v", err)
 				return
@@ -94,7 +100,7 @@ func (srv *Server) Serve(l net.PacketConn) error {
 			req.RemoteAddr = peerAddr.String()
 			srv.Handler.ServeMessage(req)
 			// No need to call req.Body.Close - underlying reader is bytes.Buffer.
-		}(buf, peerAddr)
+		}()
 	}
 }
 

network.go

@@ -10,14 +10,14 @@ import (
 // httpuClient creates a HTTPU client that multiplexes to all multicast-capable
 // IPv4 addresses on the host. Returns a function to clean up once the client is
 // no longer required.
-func httpuClient() (httpu.ClientInterface, func(), error) {
+func httpuClient() (httpu.ClientInterfaceCtx, func(), error) {
 	addrs, err := localIPv4MCastAddrs()
 	if err != nil {
 		return nil, nil, ctxError(err, "requesting host IPv4 addresses")
 	}
 
 	closers := make([]io.Closer, 0, len(addrs))
-	delegates := make([]httpu.ClientInterface, 0, len(addrs))
+	delegates := make([]httpu.ClientInterfaceCtx, 0, len(addrs))
 	for _, addr := range addrs {
 		c, err := httpu.NewHTTPUClientAddr(addr)
 		if err != nil {
@@ -34,7 +34,7 @@ func httpuClient() (httpu.ClientInterface, func(), error) {
 		}
 	}
 
-	return httpu.NewMultiClient(delegates), closer, nil
+	return httpu.NewMultiClientCtx(delegates), closer, nil
 }
 
 // localIPv2MCastAddrs returns the set of IPv4 addresses on multicast-able

soap/soap.go

@@ -194,9 +194,13 @@ type soapBody struct {
 
 // SOAPFaultError implements error, and contains SOAP fault information.
 type SOAPFaultError struct {
-	FaultCode   string `xml:"faultCode"`
-	FaultString string `xml:"faultString"`
+	FaultCode   string `xml:"faultcode"`
+	FaultString string `xml:"faultstring"`
 	Detail      struct {
+		UPnPError struct {
+			Errorcode        int    `xml:"errorCode"`
+			ErrorDescription string `xml:"errorDescription"`
+		} `xml:"UPnPError"`
 		Raw []byte `xml:",innerxml"`
 	} `xml:"detail"`
 }

soap/soap_test.go

@@ -2,10 +2,12 @@ package soap
 
 import (
 	"bytes"
+	"errors"
 	"io/ioutil"
 	"net/http"
 	"net/url"
 	"reflect"
+	"strings"
 	"testing"
 )
 
@@ -87,6 +89,75 @@ func TestActionInputs(t *testing.T) {
 	}
 }
 
+func TestUPnPError(t *testing.T) {
+	t.Parallel()
+	url, err := url.Parse("http://example.com/soap")
+	if err != nil {
+		t.Fatal(err)
+	}
+	body := `
+	<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
+		<s:Body>
+			<s:Fault>
+				<faultcode>s:Client</faultcode>
+				<faultstring>UPnPError</faultstring>
+				<detail>
+					<UPnPError xmlns="urn:schemas-upnp-org:control-1-0">
+						<errorCode>725</errorCode>
+						<errorDescription>OnlyPermanentLeasesSupported</errorDescription>
+					</UPnPError>
+				</detail>
+			</s:Fault>
+		</s:Body>
+	</s:Envelope>`
+	rt := &capturingRoundTripper{
+		resp: &http.Response{
+			StatusCode:    500,
+			ContentLength: int64(len(body)),
+			Body:          ioutil.NopCloser(bytes.NewBufferString(body)),
+		},
+	}
+	client := SOAPClient{
+		EndpointURL: *url,
+		HTTPClient: http.Client{
+			Transport: rt,
+		},
+	}
+
+	err = client.PerformAction("mynamespace", "myaction", nil, nil)
+	if err == nil {
+		t.Fatal("expected error, got nil")
+	}
+	if testing.Verbose() {
+		t.Logf("%+v\n", err)
+	}
+	soapErr := &SOAPFaultError{}
+	if ok := errors.As(err, &soapErr); !ok {
+		t.Fatal("expected *SOAPFaultError")
+	}
+	if soapErr.FaultCode != "s:Client" {
+		t.Fatalf("unexpected FaultCode: %s", soapErr.FaultCode)
+	}
+	if soapErr.FaultString != "UPnPError" {
+		t.Fatalf("unexpected FaultString: %s", soapErr.FaultString)
+	}
+	if soapErr.Detail.UPnPError.Errorcode != 725 {
+		t.Fatalf("unexpected UPnPError Errorcode: %d", soapErr.Detail.UPnPError.Errorcode)
+	}
+	if soapErr.Detail.UPnPError.ErrorDescription != "OnlyPermanentLeasesSupported" {
+		t.Fatalf("unexpected UPnPError ErrorDescription: %s",
+			soapErr.Detail.UPnPError.ErrorDescription)
+	}
+
+	if !strings.EqualFold(string(soapErr.Detail.Raw), `
+					<UPnPError xmlns="urn:schemas-upnp-org:control-1-0">
+						<errorCode>725</errorCode>
+						<errorDescription>OnlyPermanentLeasesSupported</errorDescription>
+					</UPnPError>
+				`) {
+		t.Fatalf("unexpected Detail.Raw, got:\n%s", string(soapErr.Detail.Raw))
+	}
+}
 
 func TestEscapeXMLText(t *testing.T) {
 	t.Parallel()

ssdp/ssdp.go

@@ -35,6 +35,15 @@ type HTTPUClient interface {
 	) ([]*http.Response, error)
 }
 
+// HTTPUClientCtx is an optional interface that will be used to perform
+// HTTP-over-UDP requests if the client implements it.
+type HTTPUClientCtx interface {
+	DoWithContext(
+		req *http.Request,
+		numSends int,
+	) ([]*http.Response, error)
+}
+
 // SSDPRawSearchCtx performs a fairly raw SSDP search request, and returns the
 // unique response(s) that it receives. Each response has the requested
 // searchTarget, a USN, and a valid location. maxWaitSeconds states how long to
@@ -49,8 +58,64 @@ func SSDPRawSearchCtx(
 	maxWaitSeconds int,
 	numSends int,
 ) ([]*http.Response, error) {
+	req, err := prepareRequest(ctx, searchTarget, maxWaitSeconds)
+	if err != nil {
+		return nil, err
+	}
+
+	allResponses, err := httpu.Do(req, time.Duration(maxWaitSeconds)*time.Second+100*time.Millisecond, numSends)
+	if err != nil {
+		return nil, err
+	}
+	return processSSDPResponses(searchTarget, allResponses)
+}
+
+// RawSearch performs a fairly raw SSDP search request, and returns the
+// unique response(s) that it receives. Each response has the requested
+// searchTarget, a USN, and a valid location. If the provided context times out
+// or is canceled, the search will be aborted. numSends is the number of
+// requests to send - 3 is a reasonable value for this.
+//
+// The provided context should have a deadline, since the SSDP protocol
+// requires the max wait time be included in search requests. If the context
+// has no deadline, then a default deadline of 3 seconds will be applied.
+func RawSearch(
+	ctx context.Context,
+	httpu HTTPUClientCtx,
+	searchTarget string,
+	numSends int,
+) ([]*http.Response, error) {
+	// We need a timeout value to include in the SSDP request; get it by
+	// checking the deadline on the context.
+	var maxWaitSeconds int
+	if deadline, ok := ctx.Deadline(); ok {
+		maxWaitSeconds = int(deadline.Sub(time.Now()) / time.Second)
+	} else {
+		// Pick a default timeout of 3 seconds if none was provided.
+		maxWaitSeconds = 3
+
+		var cancel func()
+		ctx, cancel = context.WithTimeout(ctx, time.Duration(maxWaitSeconds)*time.Second)
+		defer cancel()
+	}
+
+	req, err := prepareRequest(ctx, searchTarget, maxWaitSeconds)
+	if err != nil {
+		return nil, err
+	}
+
+	allResponses, err := httpu.DoWithContext(req, numSends)
+	if err != nil {
+		return nil, err
+	}
+	return processSSDPResponses(searchTarget, allResponses)
+}
+
+// prepareRequest checks the provided parameters and constructs a SSDP search
+// request to be sent.
+func prepareRequest(ctx context.Context, searchTarget string, maxWaitSeconds int) (*http.Request, error) {
 	if maxWaitSeconds < 1 {
-		return nil, errors.New("ssdp: maxWaitSeconds must be >= 1")
+		return nil, errors.New("ssdp: request timeout must be at least 1s")
 	}
 
 	req := (&http.Request{
@@ -67,11 +132,13 @@ func SSDPRawSearchCtx(
 			"ST":   []string{searchTarget},
 		},
 	}).WithContext(ctx)
-	allResponses, err := httpu.Do(req, time.Duration(maxWaitSeconds)*time.Second+100*time.Millisecond, numSends)
-	if err != nil {
-		return nil, err
-	}
+	return req, nil
+}
 
+func processSSDPResponses(
+	searchTarget string,
+	allResponses []*http.Response,
+) ([]*http.Response, error) {
 	isExactSearch := searchTarget != SSDPAll && searchTarget != UPNPRootDevice
 
 	seenIDs := make(map[string]bool)

v2alpha/cmd/goupnp2srvgen/main.go

@@ -23,7 +23,9 @@ import (
 	"github.com/huin/goupnp/v2alpha/description/typedesc"
 	"github.com/huin/goupnp/v2alpha/description/xmlsrvdesc"
 	"github.com/huin/goupnp/v2alpha/soap"
-	"github.com/huin/goupnp/v2alpha/soap/types"
+	"golang.org/x/exp/maps"
+
+	soaptypes "github.com/huin/goupnp/v2alpha/soap/types"
 )
 
 var (
@@ -31,7 +33,9 @@ var (
 	outputDir        = flag.String("output_dir", "", "Path to directory to write output in.")
 	srvManifests     = flag.String("srv_manifests", "", "Path to srvmanifests.toml")
 	srvTemplate      = flag.String("srv_template", "", "Path to srv.gotemplate.")
-	upnpresourcesZip = flag.String("upnpresources_zip", "", "Path to upnpresources.zip.")
+	upnpresourcesZip = flag.String("upnpresources_zip", "",
+		"Path to upnpresources.zip, downloaded from "+
+			"https://openconnectivity.org/upnp-specs/upnpresources.zip.")
 )
 
 const soapActionInterface = "SOAPActionInterface"
@@ -50,14 +54,14 @@ func run() error {
 	}
 
 	if *outputDir == "" {
-		return errors.New("-output_dir is a required flag.")
+		return errors.New("-output_dir is a required flag")
 	}
 	if err := os.MkdirAll(*outputDir, 0); err != nil {
 		return fmt.Errorf("creating output_dir %q: %w", *outputDir, err)
 	}
 
 	if *srvManifests == "" {
-		return errors.New("-srv_manifests is a required flag.")
+		return errors.New("-srv_manifests is a required flag")
 	}
 	var manifests DCPSpecManifests
 	_, err := toml.DecodeFile(*srvManifests, &manifests)
@@ -66,7 +70,7 @@ func run() error {
 	}
 
 	if *srvTemplate == "" {
-		return errors.New("-srv_template is a required flag.")
+		return errors.New("-srv_template is a required flag")
 	}
 	tmpl, err := template.New(filepath.Base(*srvTemplate)).Funcs(template.FuncMap{
 		"args":  tmplfuncs.Args,
@@ -77,7 +81,7 @@ func run() error {
 	}
 
 	if *upnpresourcesZip == "" {
-		return errors.New("-upnpresources_zip is a required flag.")
+		return errors.New("-upnpresources_zip is a required flag")
 	}
 	f, err := os.Open(*upnpresourcesZip)
 	if err != nil {
@@ -91,7 +95,7 @@ func run() error {
 
 	// Use default type map for now. Addtional types could be use instead or
 	// as well as necessary for extended types.
-	typeMap := types.TypeMap().Clone()
+	typeMap := soaptypes.TypeMap().Clone()
 	typeMap[soapActionInterface] = typedesc.TypeDesc{
 		GoType: reflect.TypeOf((*soap.Action)(nil)).Elem(),
 	}
@@ -158,7 +162,8 @@ func processService(
 		return fmt.Errorf("transforming service description: %w", err)
 	}
 
-	imps, err := accumulateImports(sd, typeMap)
+	imps := newImports()
+	types, err := accumulateTypes(sd, typeMap, imps)
 	if err != nil {
 		return err
 	}
@@ -167,6 +172,7 @@ func processService(
 	err = tmpl.ExecuteTemplate(buf, "service", tmplArgs{
 		Manifest: srvManifest,
 		Imps:     imps,
+		Types:    types,
 		SCPD:     sd,
 	})
 	if err != nil {
@@ -219,14 +225,44 @@ type ServiceManifest struct {
 type tmplArgs struct {
 	Manifest *ServiceManifest
 	Imps     *imports
+	Types    *types
 	SCPD     *srvdesc.SCPD
 }
 
 type imports struct {
-	// Maps from a type name like "ui4" to the `alias.name` for the import.
-	TypeByName map[string]typeDesc
 	// Each required import line, ordered by path.
 	ImportLines []importItem
+	// aliasByPath maps from import path to its imported alias.
+	aliasByPath map[string]string
+	// nextAlias is the number for the next import alias.
+	nextAlias int
+}
+
+func newImports() *imports {
+	return &imports{
+		aliasByPath: make(map[string]string),
+		nextAlias:   1,
+	}
+}
+
+func (imps *imports) getAliasForPath(path string) string {
+	if alias, ok := imps.aliasByPath[path]; ok {
+		return alias
+	}
+	alias := fmt.Sprintf("pkg%d", imps.nextAlias)
+	imps.nextAlias++
+	imps.ImportLines = append(imps.ImportLines, importItem{
+		Alias: alias,
+		Path:  path,
+	})
+	imps.aliasByPath[path] = alias
+	return alias
+}
+
+type types struct {
+	// Maps from a type name like "ui4" to the `alias.name` for the import.
+	TypeByName    map[string]typeDesc
+	StringVarDefs []stringVarDef
 }
 
 type typeDesc struct {
@@ -239,17 +275,41 @@ type typeDesc struct {
 	Name string
 }
 
+type stringVarDef struct {
+	Name          string
+	AllowedValues []string
+}
+
 type importItem struct {
 	Alias string
 	Path  string
 }
 
-func accumulateImports(srvDesc *srvdesc.SCPD, typeMap typedesc.TypeMap) (*imports, error) {
-	typeNames := make(map[string]bool)
-	typeNames[soapActionInterface] = true
+// accumulateTypes creates type information, and adds any required imports for
+// them.
+func accumulateTypes(
+	srvDesc *srvdesc.SCPD,
+	typeMap typedesc.TypeMap,
+	imps *imports,
+) (*types, error) {
+	typeNames := make(map[string]struct{})
+	typeNames[soapActionInterface] = struct{}{}
 
-	err := visitTypesSCPD(srvDesc, func(typeName string) {
-		typeNames[typeName] = true
+	var stringVarDefs []stringVarDef
+	sortedVarNames := maps.Keys(srvDesc.VariableByName)
+	sort.Strings(sortedVarNames)
+	for _, svName := range sortedVarNames {
+		sv := srvDesc.VariableByName[svName]
+		if sv.DataType == "string" && len(sv.AllowedValues) > 0 {
+			stringVarDefs = append(stringVarDefs, stringVarDef{
+				Name:          svName,
+				AllowedValues: srvDesc.VariableByName[svName].AllowedValues,
+			})
+		}
+	}
+
+	err := visitTypesSCPD(srvDesc, func(sv *srvdesc.StateVariable) {
+		typeNames[sv.DataType] = struct{}{}
 	})
 	if err != nil {
 		return nil, err
@@ -257,7 +317,7 @@ func accumulateImports(srvDesc *srvdesc.SCPD, typeMap typedesc.TypeMap) (*import
 
 	// Have sorted list of import package paths. Partly for aesthetics of generated code, but also
 	// to have stable-generated aliases.
-	paths := make(map[string]bool)
+	paths := make(map[string]struct{})
 	for typeName := range typeNames {
 		t, ok := typeMap[typeName]
 		if !ok {
@@ -265,29 +325,17 @@ func accumulateImports(srvDesc *srvdesc.SCPD, typeMap typedesc.TypeMap) (*import
 		}
 		pkgPath := t.GoType.PkgPath()
 		if pkgPath == "" {
-			// Builtin type, ignore.
+			// Builtin type, no import needed.
 			continue
 		}
-		paths[pkgPath] = true
-	}
-	sortedPaths := make([]string, 0, len(paths))
-	for path := range paths {
-		sortedPaths = append(sortedPaths, path)
+		paths[pkgPath] = struct{}{}
 	}
+	sortedPaths := maps.Keys(paths)
 	sort.Strings(sortedPaths)
 
-	// Generate import aliases.
-	index := 1
-	aliasByPath := make(map[string]string, len(paths))
-	importLines := make([]importItem, 0, len(paths))
+	// Generate import aliases in deterministic order.
 	for _, path := range sortedPaths {
-		alias := fmt.Sprintf("pkg%d", index)
-		index++
-		importLines = append(importLines, importItem{
-			Alias: alias,
-			Path:  path,
-		})
-		aliasByPath[path] = alias
+		imps.getAliasForPath(path)
 	}
 
 	// Populate typeByName.
@@ -295,28 +343,27 @@ func accumulateImports(srvDesc *srvdesc.SCPD, typeMap typedesc.TypeMap) (*import
 	for typeName := range typeNames {
 		goType := typeMap[typeName]
 		pkgPath := goType.GoType.PkgPath()
-		alias := aliasByPath[pkgPath]
 		td := typeDesc{
 			Name: goType.GoType.Name(),
 		}
-		if alias == "" {
+		if pkgPath == "" {
 			// Builtin type.
 			td.AbsRef = td.Name
 			td.Ref = td.Name
 		} else {
 			td.AbsRef = strconv.Quote(pkgPath) + "." + td.Name
-			td.Ref = alias + "." + td.Name
+			td.Ref = imps.getAliasForPath(pkgPath) + "." + td.Name
 		}
 		typeByName[typeName] = td
 	}
 
-	return &imports{
-		TypeByName:  typeByName,
-		ImportLines: importLines,
+	return &types{
+		TypeByName:    typeByName,
+		StringVarDefs: stringVarDefs,
 	}, nil
 }
 
-type typeVisitor func(typeName string)
+type typeVisitor func(sv *srvdesc.StateVariable)
 
 // visitTypesSCPD calls `visitor` with each data type name (e.g. "ui4") referenced
 // by action arguments.`
@@ -335,14 +382,14 @@ func visitTypesAction(action *srvdesc.Action, visitor typeVisitor) error {
 		if err != nil {
 			return err
 		}
-		visitor(sv.DataType)
+		visitor(sv)
 	}
 	for _, arg := range action.OutArgs {
 		sv, err := arg.RelatedStateVariable()
 		if err != nil {
 			return err
 		}
-		visitor(sv.DataType)
+		visitor(sv)
 	}
 	return nil
 }

v2alpha/description/srvdesc/srvdesc.go

@@ -10,9 +10,9 @@ import (
 )
 
 var (
-	BadDescriptionError         = errors.New("bad XML description")
-	MissingDefinitionError      = errors.New("missing definition")
-	UnsupportedDescriptionError = errors.New("unsupported XML description")
+	ErrBadDescription         = errors.New("bad XML description")
+	ErrMissingDefinition      = errors.New("missing definition")
+	ErrUnsupportedDescription = errors.New("unsupported XML description")
 )
 
 // SCPD is the top level service description.
@@ -37,7 +37,7 @@ func FromXML(xmlDesc *xmlsrvdesc.SCPD) (*SCPD, error) {
 		}
 		if _, exists := stateVariables[sv.Name]; exists {
 			return nil, fmt.Errorf("%w: multiple state variables with name %q",
-				BadDescriptionError, sv.Name)
+				ErrBadDescription, sv.Name)
 		}
 		stateVariables[sv.Name] = sv
 	}
@@ -49,7 +49,7 @@ func FromXML(xmlDesc *xmlsrvdesc.SCPD) (*SCPD, error) {
 		}
 		if _, exists := actions[action.Name]; exists {
 			return nil, fmt.Errorf("%w: multiple actions with name %q",
-				BadDescriptionError, action.Name)
+				ErrBadDescription, action.Name)
 		}
 		actions[action.Name] = action
 	}
@@ -79,7 +79,7 @@ type Action struct {
 // actionFromXML creates an Action from the given XML description.
 func actionFromXML(xmlAction *xmlsrvdesc.Action, scpd *SCPD) (*Action, error) {
 	if xmlAction.Name == "" {
-		return nil, fmt.Errorf("%w: empty action name", BadDescriptionError)
+		return nil, fmt.Errorf("%w: empty action name", ErrBadDescription)
 	}
 	action := &Action{
 		SCPD: scpd,
@@ -99,7 +99,7 @@ func actionFromXML(xmlAction *xmlsrvdesc.Action, scpd *SCPD) (*Action, error) {
 			outArgs = append(outArgs, arg)
 		default:
 			return nil, fmt.Errorf("%w: argument %q has invalid direction %q",
-				BadDescriptionError, xmlArg.Name, xmlArg.Direction)
+				ErrBadDescription, xmlArg.Name, xmlArg.Direction)
 		}
 	}
 	action.InArgs = inArgs
@@ -117,10 +117,10 @@ type Argument struct {
 // argumentFromXML creates an Argument from the XML description.
 func argumentFromXML(xmlArg *xmlsrvdesc.Argument, action *Action) (*Argument, error) {
 	if xmlArg.Name == "" {
-		return nil, fmt.Errorf("%w: empty argument name", BadDescriptionError)
+		return nil, fmt.Errorf("%w: empty argument name", ErrBadDescription)
 	}
 	if xmlArg.RelatedStateVariable == "" {
-		return nil, fmt.Errorf("%w: empty related state variable", BadDescriptionError)
+		return nil, fmt.Errorf("%w: empty related state variable", ErrBadDescription)
 	}
 	return &Argument{
 		Action:                   action,
@@ -133,25 +133,32 @@ func (arg *Argument) RelatedStateVariable() (*StateVariable, error) {
 	if v, ok := arg.Action.SCPD.VariableByName[arg.RelatedStateVariableName]; ok {
 		return v, nil
 	}
-	return nil, fmt.Errorf("%w: state variable %q", MissingDefinitionError, arg.RelatedStateVariableName)
+	return nil, fmt.Errorf("%w: state variable %q", ErrMissingDefinition, arg.RelatedStateVariableName)
 }
 
 // StateVariable description data.
 type StateVariable struct {
 	Name     string
 	DataType string
+
+	AllowedValues []string
 }
 
 func stateVariableFromXML(xmlSV *xmlsrvdesc.StateVariable) (*StateVariable, error) {
 	if xmlSV.Name == "" {
-		return nil, fmt.Errorf("%w: empty state variable name", BadDescriptionError)
+		return nil, fmt.Errorf("%w: empty state variable name", ErrBadDescription)
 	}
 	if xmlSV.DataType.Type != "" {
 		return nil, fmt.Errorf("%w: unsupported data type %q",
-			UnsupportedDescriptionError, xmlSV.DataType.Type)
+			ErrUnsupportedDescription, xmlSV.DataType.Type)
+	}
+	if xmlSV.DataType.Name != "string" && len(xmlSV.AllowedValues) > 0 {
+		return nil, fmt.Errorf("%w: allowedValueList is currently unsupported for type %q",
+			ErrUnsupportedDescription, xmlSV.DataType.Name)
 	}
 	return &StateVariable{
-		Name:     xmlSV.Name,
-		DataType: xmlSV.DataType.Name,
+		Name:          xmlSV.Name,
+		DataType:      xmlSV.DataType.Name,
+		AllowedValues: xmlSV.AllowedValues,
 	}, nil
 }

v2alpha/go.mod

@@ -2,6 +2,8 @@ module github.com/huin/goupnp/v2alpha
 
 go 1.18
 
-require github.com/google/go-cmp v0.5.7
+require github.com/google/go-cmp v0.5.8
 
 require github.com/BurntSushi/toml v1.1.0
+
+require golang.org/x/exp v0.0.0-20230307190834-24139beb5833 // indirect

v2alpha/go.sum

@@ -2,5 +2,9 @@ github.com/BurntSushi/toml v1.1.0 h1:ksErzDEI1khOiGPgpwuI7x2ebx/uXQNw7xJpn9Eq1+I
 github.com/BurntSushi/toml v1.1.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
 github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
+github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
+github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+golang.org/x/exp v0.0.0-20230307190834-24139beb5833 h1:SChBja7BCQewoTAU7IgvucQKMIXrEpFxNMs0spT3/5s=
+golang.org/x/exp v0.0.0-20230307190834-24139beb5833/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

v2alpha/soap/client/client.go

@@ -8,15 +8,52 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"strings"
 
 	"github.com/huin/goupnp/v2alpha/soap"
 	"github.com/huin/goupnp/v2alpha/soap/envelope"
 )
 
-var _ HttpClient = &http.Client{}
+var (
+	// ErrSOAP can be used with errors.Is.
+	ErrSOAP = errors.New("SOAP error")
+)
 
-// HttpClient defines the interface required of an HTTP client. It is a subset of *http.Client.
-type HttpClient interface {
+// SOAPError describes an error from this package, potentially including a
+// lower-level cause.
+type SOAPError struct {
+	// description describes the error from the SOAP perspective.
+	description string
+	// cause may be nil.
+	cause error
+}
+
+func (se *SOAPError) Error() string {
+	b := &strings.Builder{}
+	b.WriteString("SOAP error")
+	if se.description != "" {
+		b.WriteString(": ")
+		b.WriteString(se.description)
+	}
+	if se.cause != nil {
+		b.WriteString(": ")
+		b.WriteString(se.cause.Error())
+	}
+	return b.String()
+}
+
+func (se *SOAPError) Is(target error) bool {
+	return target == ErrSOAP
+}
+
+func (se *SOAPError) Unwrap() error {
+	return se.cause
+}
+
+var _ HTTPClient = &http.Client{}
+
+// HTTPClient defines the interface required of an HTTP client. It is a subset of *http.Client.
+type HTTPClient interface {
 	Do(req *http.Request) (*http.Response, error)
 }
 
@@ -25,22 +62,21 @@ type Option func(*options)
 
 // WithHTTPClient specifies an *http.Client to use instead of
 // http.DefaultClient.
-func WithHTTPClient(httpClient HttpClient) Option {
+func WithHTTPClient(httpClient HTTPClient) Option {
 	return func(o *options) {
 		o.httpClient = httpClient
 	}
 }
 
 type options struct {
-	httpClient HttpClient
+	httpClient HTTPClient
 }
 
 // Client is a SOAP client, attached to a specific SOAP endpoint.
 // the zero value is not usable, use NewClient() to create an instance.
 type Client struct {
-	httpClient            HttpClient
-	endpointURL           string
-	maxErrorResponseBytes int
+	httpClient  HTTPClient
+	endpointURL string
 }
 
 // New creates a new SOAP client, which will POST its requests to the
@@ -79,8 +115,10 @@ func (c *Client) Do(
 	defer resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
-		return fmt.Errorf("SOAP request got HTTP %s (%d)",
-			resp.Status, resp.StatusCode)
+		return &SOAPError{
+			description: fmt.Sprintf("SOAP request got HTTP %s (%d)",
+				resp.Status, resp.StatusCode),
+		}
 	}
 
 	return ParseResponseAction(resp, actionOut)
@@ -110,7 +148,10 @@ func SetRequestAction(
 	buf := &bytes.Buffer{}
 	err := envelope.Write(buf, actionIn)
 	if err != nil {
-		return fmt.Errorf("encoding envelope: %w", err)
+		return &SOAPError{
+			description: "encoding envelope",
+			cause:       err,
+		}
 	}
 
 	req.Body = io.NopCloser(buf)
@@ -131,31 +172,39 @@ func ParseResponseAction(
 	actionOut *envelope.Action,
 ) error {
 	if resp.Body == nil {
-		return errors.New("missing response body")
+		return &SOAPError{description: "missing HTTP response body"}
 	}
 
 	buf := &bytes.Buffer{}
 	if _, err := io.Copy(buf, resp.Body); err != nil {
-		return fmt.Errorf("reading response body: %w", err)
+		return &SOAPError{
+			description: "reading HTTP response body",
+			cause:       err,
+		}
 	}
 
 	if err := envelope.Read(buf, actionOut); err != nil {
-		if _, ok := err.(*envelope.Fault); ok {
+		if errors.Is(err, envelope.ErrFault) {
 			// Parsed cleanly, got SOAP fault.
-			return err
+			return &SOAPError{
+				description: "SOAP fault",
+				cause:       err,
+			}
 		}
 		// Parsing problem, provide some information for context.
 		dispLen := buf.Len()
 		truncMessage := ""
 		if dispLen > 1024 {
 			dispLen = 1024
-			truncMessage = fmt.Sprintf("first %d bytes: ", dispLen)
+			truncMessage = fmt.Sprintf("first %d bytes (total %d bytes): ", dispLen, buf.Len())
+		}
+		return &SOAPError{
+			description: fmt.Sprintf(
+				"parsing SOAP response from HTTP body (%s%q)",
+				truncMessage, buf.Bytes()[:dispLen],
+			),
+			cause: err,
 		}
-		return fmt.Errorf(
-			"parsing response body (%s%q): %w",
-			truncMessage, buf.Bytes()[:dispLen],
-			err,
-		)
 	}
 
 	return nil

v2alpha/soap/types/types.go

@@ -321,9 +321,9 @@ var _ SOAPValue = &Fixed14_4{}
 
 // Fixed14_4FromParts creates a Fixed14_4 from components.
 // Bounds:
-//   * Both intPart and fracPart must have the same sign.
-//   * -1e14 < intPart < 1e14
-//   * -1e4 < fracPart < 1e4
+//   - Both intPart and fracPart must have the same sign.
+//   - -1e14 < intPart < 1e14
+//   - -1e4 < fracPart < 1e4
 func Fixed14_4FromParts(intPart int64, fracPart int16) (Fixed14_4, error) {
 	var v Fixed14_4
 	err := v.SetParts(intPart, fracPart)
@@ -332,9 +332,9 @@ func Fixed14_4FromParts(intPart int64, fracPart int16) (Fixed14_4, error) {
 
 // SetFromParts sets the value based on the integer component and the fractional component.
 // Bounds:
-//   * Both intPart and fracPart must have the same sign.
-//   * -1e14 < intPart < 1e14
-//   * -1e4 < fracPart < 1e4
+//   - Both intPart and fracPart must have the same sign.
+//   - -1e14 < intPart < 1e14
+//   - -1e4 < fracPart < 1e4
 func (v *Fixed14_4) SetParts(intPart int64, fracPart int16) error {
 	if (intPart < 0) != (fracPart < 0) {
 		return fmt.Errorf("want intPart and fracPart with same sign, got %d and %d",

v2alpha/srv/inetgw2/lanhostcfgmgmt1/lanhostcfgmgmt1.go

@@ -34,6 +34,7 @@ func (a *DeleteDNSServer) RefResponse() any { return &a.Response }
 
 // DeleteDNSServerRequest contains the "in" args for the "DeleteDNSServer" action.
 type DeleteDNSServerRequest struct {
+	// NewDNSServers relates to state variable DNSServers.
 	NewDNSServers string
 }
 
@@ -64,6 +65,7 @@ func (a *DeleteIPRouter) RefResponse() any { return &a.Response }
 
 // DeleteIPRouterRequest contains the "in" args for the "DeleteIPRouter" action.
 type DeleteIPRouterRequest struct {
+	// NewIPRouters relates to state variable IPRouters.
 	NewIPRouters string
 }
 
@@ -94,6 +96,7 @@ func (a *DeleteReservedAddress) RefResponse() any { return &a.Response }
 
 // DeleteReservedAddressRequest contains the "in" args for the "DeleteReservedAddress" action.
 type DeleteReservedAddressRequest struct {
+	// NewReservedAddresses relates to state variable ReservedAddresses.
 	NewReservedAddresses string
 }
 
@@ -127,7 +130,9 @@ type GetAddressRangeRequest struct{}
 
 // GetAddressRangeResponse contains the "out" args for the "GetAddressRange" action.
 type GetAddressRangeResponse struct {
+	// NewMinAddress relates to state variable MinAddress.
 	NewMinAddress string
+	// NewMaxAddress relates to state variable MaxAddress.
 	NewMaxAddress string
 }
 
@@ -158,6 +163,7 @@ type GetDHCPRelayRequest struct{}
 
 // GetDHCPRelayResponse contains the "out" args for the "GetDHCPRelay" action.
 type GetDHCPRelayResponse struct {
+	// NewDHCPRelay relates to state variable DHCPRelay.
 	NewDHCPRelay pkg2.Boolean
 }
 
@@ -188,6 +194,7 @@ type GetDHCPServerConfigurableRequest struct{}
 
 // GetDHCPServerConfigurableResponse contains the "out" args for the "GetDHCPServerConfigurable" action.
 type GetDHCPServerConfigurableResponse struct {
+	// NewDHCPServerConfigurable relates to state variable DHCPServerConfigurable.
 	NewDHCPServerConfigurable pkg2.Boolean
 }
 
@@ -218,6 +225,7 @@ type GetDNSServersRequest struct{}
 
 // GetDNSServersResponse contains the "out" args for the "GetDNSServers" action.
 type GetDNSServersResponse struct {
+	// NewDNSServers relates to state variable DNSServers.
 	NewDNSServers string
 }
 
@@ -248,6 +256,7 @@ type GetDomainNameRequest struct{}
 
 // GetDomainNameResponse contains the "out" args for the "GetDomainName" action.
 type GetDomainNameResponse struct {
+	// NewDomainName relates to state variable DomainName.
 	NewDomainName string
 }
 
@@ -278,6 +287,7 @@ type GetIPRoutersListRequest struct{}
 
 // GetIPRoutersListResponse contains the "out" args for the "GetIPRoutersList" action.
 type GetIPRoutersListResponse struct {
+	// NewIPRouters relates to state variable IPRouters.
 	NewIPRouters string
 }
 
@@ -308,6 +318,7 @@ type GetReservedAddressesRequest struct{}
 
 // GetReservedAddressesResponse contains the "out" args for the "GetReservedAddresses" action.
 type GetReservedAddressesResponse struct {
+	// NewReservedAddresses relates to state variable ReservedAddresses.
 	NewReservedAddresses string
 }
 
@@ -338,6 +349,7 @@ type GetSubnetMaskRequest struct{}
 
 // GetSubnetMaskResponse contains the "out" args for the "GetSubnetMask" action.
 type GetSubnetMaskResponse struct {
+	// NewSubnetMask relates to state variable SubnetMask.
 	NewSubnetMask string
 }
 
@@ -365,7 +377,9 @@ func (a *SetAddressRange) RefResponse() any { return &a.Response }
 
 // SetAddressRangeRequest contains the "in" args for the "SetAddressRange" action.
 type SetAddressRangeRequest struct {
+	// NewMinAddress relates to state variable MinAddress.
 	NewMinAddress string
+	// NewMaxAddress relates to state variable MaxAddress.
 	NewMaxAddress string
 }
 
@@ -396,6 +410,7 @@ func (a *SetDHCPRelay) RefResponse() any { return &a.Response }
 
 // SetDHCPRelayRequest contains the "in" args for the "SetDHCPRelay" action.
 type SetDHCPRelayRequest struct {
+	// NewDHCPRelay relates to state variable DHCPRelay.
 	NewDHCPRelay pkg2.Boolean
 }
 
@@ -426,6 +441,7 @@ func (a *SetDHCPServerConfigurable) RefResponse() any { return &a.Response }
 
 // SetDHCPServerConfigurableRequest contains the "in" args for the "SetDHCPServerConfigurable" action.
 type SetDHCPServerConfigurableRequest struct {
+	// NewDHCPServerConfigurable relates to state variable DHCPServerConfigurable.
 	NewDHCPServerConfigurable pkg2.Boolean
 }
 
@@ -456,6 +472,7 @@ func (a *SetDNSServer) RefResponse() any { return &a.Response }
 
 // SetDNSServerRequest contains the "in" args for the "SetDNSServer" action.
 type SetDNSServerRequest struct {
+	// NewDNSServers relates to state variable DNSServers.
 	NewDNSServers string
 }
 
@@ -486,6 +503,7 @@ func (a *SetDomainName) RefResponse() any { return &a.Response }
 
 // SetDomainNameRequest contains the "in" args for the "SetDomainName" action.
 type SetDomainNameRequest struct {
+	// NewDomainName relates to state variable DomainName.
 	NewDomainName string
 }
 
@@ -516,6 +534,7 @@ func (a *SetIPRouter) RefResponse() any { return &a.Response }
 
 // SetIPRouterRequest contains the "in" args for the "SetIPRouter" action.
 type SetIPRouterRequest struct {
+	// NewIPRouters relates to state variable IPRouters.
 	NewIPRouters string
 }
 
@@ -546,6 +565,7 @@ func (a *SetReservedAddress) RefResponse() any { return &a.Response }
 
 // SetReservedAddressRequest contains the "in" args for the "SetReservedAddress" action.
 type SetReservedAddressRequest struct {
+	// NewReservedAddresses relates to state variable ReservedAddresses.
 	NewReservedAddresses string
 }
 
@@ -576,6 +596,7 @@ func (a *SetSubnetMask) RefResponse() any { return &a.Response }
 
 // SetSubnetMaskRequest contains the "in" args for the "SetSubnetMask" action.
 type SetSubnetMaskRequest struct {
+	// NewSubnetMask relates to state variable SubnetMask.
 	NewSubnetMask string
 }
 

v2alpha/srv/inetgw2/wanpppconn1/wanpppconn1.go

@@ -8,6 +8,35 @@ import (
 	pkg2 "github.com/huin/goupnp/v2alpha/soap/types"
 )
 
+// Allowed values for state variable ConnectionStatus.
+const (
+	ConnectionStatus_Unconfigured = "Unconfigured"
+	ConnectionStatus_Connected    = "Connected"
+	ConnectionStatus_Disconnected = "Disconnected"
+)
+
+// Allowed values for state variable LastConnectionError.
+const (
+	LastConnectionError_ERROR_NONE = "ERROR_NONE"
+)
+
+// Allowed values for state variable PortMappingProtocol.
+const (
+	PortMappingProtocol_TCP = "TCP"
+	PortMappingProtocol_UDP = "UDP"
+)
+
+// Allowed values for state variable PossibleConnectionTypes.
+const (
+	PossibleConnectionTypes_Unconfigured  = "Unconfigured"
+	PossibleConnectionTypes_IP_Routed     = "IP_Routed"
+	PossibleConnectionTypes_DHCP_Spoofed  = "DHCP_Spoofed"
+	PossibleConnectionTypes_PPPoE_Bridged = "PPPoE_Bridged"
+	PossibleConnectionTypes_PPTP_Relay    = "PPTP_Relay"
+	PossibleConnectionTypes_L2TP_Relay    = "L2TP_Relay"
+	PossibleConnectionTypes_PPPoE_Relay   = "PPPoE_Relay"
+)
+
 const ServiceType = "urn:schemas-upnp-org:service:WANPPPConnection:1"
 
 // AddPortMapping provides request and response for the action.
@@ -34,14 +63,22 @@ func (a *AddPortMapping) RefResponse() any { return &a.Response }
 
 // AddPortMappingRequest contains the "in" args for the "AddPortMapping" action.
 type AddPortMappingRequest struct {
-	NewRemoteHost             string
-	NewExternalPort           pkg2.UI2
-	NewProtocol               string
-	NewInternalPort           pkg2.UI2
-	NewInternalClient         string
-	NewEnabled                pkg2.Boolean
+	// NewRemoteHost relates to state variable RemoteHost.
+	NewRemoteHost string
+	// NewExternalPort relates to state variable ExternalPort.
+	NewExternalPort pkg2.UI2
+	// NewProtocol relates to state variable PortMappingProtocol (2 standard allowed values).
+	NewProtocol string
+	// NewInternalPort relates to state variable InternalPort.
+	NewInternalPort pkg2.UI2
+	// NewInternalClient relates to state variable InternalClient.
+	NewInternalClient string
+	// NewEnabled relates to state variable PortMappingEnabled.
+	NewEnabled pkg2.Boolean
+	// NewPortMappingDescription relates to state variable PortMappingDescription.
 	NewPortMappingDescription string
-	NewLeaseDuration          pkg2.UI4
+	// NewLeaseDuration relates to state variable PortMappingLeaseDuration.
+	NewLeaseDuration pkg2.UI4
 }
 
 // AddPortMappingResponse contains the "out" args for the "AddPortMapping" action.
@@ -71,7 +108,9 @@ func (a *ConfigureConnection) RefResponse() any { return &a.Response }
 
 // ConfigureConnectionRequest contains the "in" args for the "ConfigureConnection" action.
 type ConfigureConnectionRequest struct {
+	// NewUserName relates to state variable UserName.
 	NewUserName string
+	// NewPassword relates to state variable Password.
 	NewPassword string
 }
 
@@ -102,9 +141,12 @@ func (a *DeletePortMapping) RefResponse() any { return &a.Response }
 
 // DeletePortMappingRequest contains the "in" args for the "DeletePortMapping" action.
 type DeletePortMappingRequest struct {
-	NewRemoteHost   string
+	// NewRemoteHost relates to state variable RemoteHost.
+	NewRemoteHost string
+	// NewExternalPort relates to state variable ExternalPort.
 	NewExternalPort pkg2.UI2
-	NewProtocol     string
+	// NewProtocol relates to state variable PortMappingProtocol (2 standard allowed values).
+	NewProtocol string
 }
 
 // DeletePortMappingResponse contains the "out" args for the "DeletePortMapping" action.
@@ -165,6 +207,7 @@ type GetAutoDisconnectTimeRequest struct{}
 
 // GetAutoDisconnectTimeResponse contains the "out" args for the "GetAutoDisconnectTime" action.
 type GetAutoDisconnectTimeResponse struct {
+	// NewAutoDisconnectTime relates to state variable AutoDisconnectTime.
 	NewAutoDisconnectTime pkg2.UI4
 }
 
@@ -195,7 +238,9 @@ type GetConnectionTypeInfoRequest struct{}
 
 // GetConnectionTypeInfoResponse contains the "out" args for the "GetConnectionTypeInfo" action.
 type GetConnectionTypeInfoResponse struct {
-	NewConnectionType          string
+	// NewConnectionType relates to state variable ConnectionType.
+	NewConnectionType string
+	// NewPossibleConnectionTypes relates to state variable PossibleConnectionTypes (7 standard allowed values).
 	NewPossibleConnectionTypes string
 }
 
@@ -226,6 +271,7 @@ type GetExternalIPAddressRequest struct{}
 
 // GetExternalIPAddressResponse contains the "out" args for the "GetExternalIPAddress" action.
 type GetExternalIPAddressResponse struct {
+	// NewExternalIPAddress relates to state variable ExternalIPAddress.
 	NewExternalIPAddress string
 }
 
@@ -253,19 +299,28 @@ func (a *GetGenericPortMappingEntry) RefResponse() any { return &a.Response }
 
 // GetGenericPortMappingEntryRequest contains the "in" args for the "GetGenericPortMappingEntry" action.
 type GetGenericPortMappingEntryRequest struct {
+	// NewPortMappingIndex relates to state variable PortMappingNumberOfEntries.
 	NewPortMappingIndex pkg2.UI2
 }
 
 // GetGenericPortMappingEntryResponse contains the "out" args for the "GetGenericPortMappingEntry" action.
 type GetGenericPortMappingEntryResponse struct {
-	NewRemoteHost             string
-	NewExternalPort           pkg2.UI2
-	NewProtocol               string
-	NewInternalPort           pkg2.UI2
-	NewInternalClient         string
-	NewEnabled                pkg2.Boolean
+	// NewRemoteHost relates to state variable RemoteHost.
+	NewRemoteHost string
+	// NewExternalPort relates to state variable ExternalPort.
+	NewExternalPort pkg2.UI2
+	// NewProtocol relates to state variable PortMappingProtocol (2 standard allowed values).
+	NewProtocol string
+	// NewInternalPort relates to state variable InternalPort.
+	NewInternalPort pkg2.UI2
+	// NewInternalClient relates to state variable InternalClient.
+	NewInternalClient string
+	// NewEnabled relates to state variable PortMappingEnabled.
+	NewEnabled pkg2.Boolean
+	// NewPortMappingDescription relates to state variable PortMappingDescription.
 	NewPortMappingDescription string
-	NewLeaseDuration          pkg2.UI4
+	// NewLeaseDuration relates to state variable PortMappingLeaseDuration.
+	NewLeaseDuration pkg2.UI4
 }
 
 // GetIdleDisconnectTime provides request and response for the action.
@@ -295,6 +350,7 @@ type GetIdleDisconnectTimeRequest struct{}
 
 // GetIdleDisconnectTimeResponse contains the "out" args for the "GetIdleDisconnectTime" action.
 type GetIdleDisconnectTimeResponse struct {
+	// NewIdleDisconnectTime relates to state variable IdleDisconnectTime.
 	NewIdleDisconnectTime pkg2.UI4
 }
 
@@ -325,7 +381,9 @@ type GetLinkLayerMaxBitRatesRequest struct{}
 
 // GetLinkLayerMaxBitRatesResponse contains the "out" args for the "GetLinkLayerMaxBitRates" action.
 type GetLinkLayerMaxBitRatesResponse struct {
-	NewUpstreamMaxBitRate   pkg2.UI4
+	// NewUpstreamMaxBitRate relates to state variable UpstreamMaxBitRate.
+	NewUpstreamMaxBitRate pkg2.UI4
+	// NewDownstreamMaxBitRate relates to state variable DownstreamMaxBitRate.
 	NewDownstreamMaxBitRate pkg2.UI4
 }
 
@@ -356,8 +414,10 @@ type GetNATRSIPStatusRequest struct{}
 
 // GetNATRSIPStatusResponse contains the "out" args for the "GetNATRSIPStatus" action.
 type GetNATRSIPStatusResponse struct {
+	// NewRSIPAvailable relates to state variable RSIPAvailable.
 	NewRSIPAvailable pkg2.Boolean
-	NewNATEnabled    pkg2.Boolean
+	// NewNATEnabled relates to state variable NATEnabled.
+	NewNATEnabled pkg2.Boolean
 }
 
 // GetPPPAuthenticationProtocol provides request and response for the action.
@@ -387,6 +447,7 @@ type GetPPPAuthenticationProtocolRequest struct{}
 
 // GetPPPAuthenticationProtocolResponse contains the "out" args for the "GetPPPAuthenticationProtocol" action.
 type GetPPPAuthenticationProtocolResponse struct {
+	// NewPPPAuthenticationProtocol relates to state variable PPPAuthenticationProtocol.
 	NewPPPAuthenticationProtocol string
 }
 
@@ -417,6 +478,7 @@ type GetPPPCompressionProtocolRequest struct{}
 
 // GetPPPCompressionProtocolResponse contains the "out" args for the "GetPPPCompressionProtocol" action.
 type GetPPPCompressionProtocolResponse struct {
+	// NewPPPCompressionProtocol relates to state variable PPPCompressionProtocol.
 	NewPPPCompressionProtocol string
 }
 
@@ -447,6 +509,7 @@ type GetPPPEncryptionProtocolRequest struct{}
 
 // GetPPPEncryptionProtocolResponse contains the "out" args for the "GetPPPEncryptionProtocol" action.
 type GetPPPEncryptionProtocolResponse struct {
+	// NewPPPEncryptionProtocol relates to state variable PPPEncryptionProtocol.
 	NewPPPEncryptionProtocol string
 }
 
@@ -477,6 +540,7 @@ type GetPasswordRequest struct{}
 
 // GetPasswordResponse contains the "out" args for the "GetPassword" action.
 type GetPasswordResponse struct {
+	// NewPassword relates to state variable Password.
 	NewPassword string
 }
 
@@ -504,18 +568,26 @@ func (a *GetSpecificPortMappingEntry) RefResponse() any { return &a.Response }
 
 // GetSpecificPortMappingEntryRequest contains the "in" args for the "GetSpecificPortMappingEntry" action.
 type GetSpecificPortMappingEntryRequest struct {
-	NewRemoteHost   string
+	// NewRemoteHost relates to state variable RemoteHost.
+	NewRemoteHost string
+	// NewExternalPort relates to state variable ExternalPort.
 	NewExternalPort pkg2.UI2
-	NewProtocol     string
+	// NewProtocol relates to state variable PortMappingProtocol (2 standard allowed values).
+	NewProtocol string
 }
 
 // GetSpecificPortMappingEntryResponse contains the "out" args for the "GetSpecificPortMappingEntry" action.
 type GetSpecificPortMappingEntryResponse struct {
-	NewInternalPort           pkg2.UI2
-	NewInternalClient         string
-	NewEnabled                pkg2.Boolean
+	// NewInternalPort relates to state variable InternalPort.
+	NewInternalPort pkg2.UI2
+	// NewInternalClient relates to state variable InternalClient.
+	NewInternalClient string
+	// NewEnabled relates to state variable PortMappingEnabled.
+	NewEnabled pkg2.Boolean
+	// NewPortMappingDescription relates to state variable PortMappingDescription.
 	NewPortMappingDescription string
-	NewLeaseDuration          pkg2.UI4
+	// NewLeaseDuration relates to state variable PortMappingLeaseDuration.
+	NewLeaseDuration pkg2.UI4
 }
 
 // GetStatusInfo provides request and response for the action.
@@ -545,9 +617,12 @@ type GetStatusInfoRequest struct{}
 
 // GetStatusInfoResponse contains the "out" args for the "GetStatusInfo" action.
 type GetStatusInfoResponse struct {
-	NewConnectionStatus    string
+	// NewConnectionStatus relates to state variable ConnectionStatus (3 standard allowed values).
+	NewConnectionStatus string
+	// NewLastConnectionError relates to state variable LastConnectionError (1 standard allowed values).
 	NewLastConnectionError string
-	NewUptime              pkg2.UI4
+	// NewUptime relates to state variable Uptime.
+	NewUptime pkg2.UI4
 }
 
 // GetUserName provides request and response for the action.
@@ -577,6 +652,7 @@ type GetUserNameRequest struct{}
 
 // GetUserNameResponse contains the "out" args for the "GetUserName" action.
 type GetUserNameResponse struct {
+	// NewUserName relates to state variable UserName.
 	NewUserName string
 }
 
@@ -607,6 +683,7 @@ type GetWarnDisconnectDelayRequest struct{}
 
 // GetWarnDisconnectDelayResponse contains the "out" args for the "GetWarnDisconnectDelay" action.
 type GetWarnDisconnectDelayResponse struct {
+	// NewWarnDisconnectDelay relates to state variable WarnDisconnectDelay.
 	NewWarnDisconnectDelay pkg2.UI4
 }
 
@@ -690,6 +767,7 @@ func (a *SetAutoDisconnectTime) RefResponse() any { return &a.Response }
 
 // SetAutoDisconnectTimeRequest contains the "in" args for the "SetAutoDisconnectTime" action.
 type SetAutoDisconnectTimeRequest struct {
+	// NewAutoDisconnectTime relates to state variable AutoDisconnectTime.
 	NewAutoDisconnectTime pkg2.UI4
 }
 
@@ -720,6 +798,7 @@ func (a *SetConnectionType) RefResponse() any { return &a.Response }
 
 // SetConnectionTypeRequest contains the "in" args for the "SetConnectionType" action.
 type SetConnectionTypeRequest struct {
+	// NewConnectionType relates to state variable ConnectionType.
 	NewConnectionType string
 }
 
@@ -750,6 +829,7 @@ func (a *SetIdleDisconnectTime) RefResponse() any { return &a.Response }
 
 // SetIdleDisconnectTimeRequest contains the "in" args for the "SetIdleDisconnectTime" action.
 type SetIdleDisconnectTimeRequest struct {
+	// NewIdleDisconnectTime relates to state variable IdleDisconnectTime.
 	NewIdleDisconnectTime pkg2.UI4
 }
 
@@ -780,6 +860,7 @@ func (a *SetWarnDisconnectDelay) RefResponse() any { return &a.Response }
 
 // SetWarnDisconnectDelayRequest contains the "in" args for the "SetWarnDisconnectDelay" action.
 type SetWarnDisconnectDelayRequest struct {
+	// NewWarnDisconnectDelay relates to state variable WarnDisconnectDelay.
 	NewWarnDisconnectDelay pkg2.UI4
 }
 

v2alpha/srv/srv.gotemplate

@@ -1,5 +1,6 @@
 {{define "service"}}
 {{- $Imps := .Imps -}}
+{{- $Types := .Types -}}
 // Package {{.Manifest.Package}} provides types for the {{quote .Manifest.ServiceType}} service.
 {{- with .Manifest.DocumentURL}}
 //
@@ -13,15 +14,28 @@ import (
 {{- end}}
 )
 
+{{range .Types.StringVarDefs}}
+{{- $Name := .Name}}
+{{- with .AllowedValues}}
+// Allowed values for state variable {{$Name}}.
+const (
+{{- range .}}
+  {{$Name}}_{{.}} = "{{.}}"
+{{- end}}
+)
+{{- end}}
+{{- end}}
+
 const ServiceType = {{quote .Manifest.ServiceType}}
 {{range .SCPD.SortedActions}}
-{{- template "action" args "Action" . "Imps" $Imps}}
+{{- template "action" args "Action" . "Imps" $Imps "Types" $Types}}
 {{end}}
 {{- end}}
 
 {{define "action"}}
 {{- $Imps := .Imps}}
-{{- $soapActionType := index $Imps.TypeByName "SOAPActionInterface"}}
+{{- $Types := .Types}}
+{{- $soapActionType := index $Types.TypeByName "SOAPActionInterface"}}
 // {{.Action.Name}} provides request and response for the action.
 //
 // ServiceType implements {{$soapActionType.AbsRef}}, self-describing the SOAP action.
@@ -43,18 +57,23 @@ func (a *{{.Action.Name}}) RefResponse() any { return &a.Response }
 
 // {{.Action.Name}}Request contains the "in" args for the {{quote .Action.Name}} action.
 type {{.Action.Name}}Request struct
-{{- template "args" args "Args" .Action.InArgs "Imps" $Imps}}
+{{- template "args" args "Args" .Action.InArgs "Imps" $Imps "Types" $Types}}
 
 // {{.Action.Name}}Response contains the "out" args for the {{quote .Action.Name}} action.
 type {{.Action.Name}}Response struct
-{{- template "args" args "Args" .Action.OutArgs "Imps" $Imps}}
+{{- template "args" args "Args" .Action.OutArgs "Imps" $Imps "Types" $Types}}
 {{- end}}
 
 {{define "args"}}
 {{- $Imps := .Imps -}}
+{{- $Types := .Types -}}
 { {{- with .Args}}
 {{- range .}}
-{{- $fieldType := index $Imps.TypeByName .RelatedStateVariable.DataType}}
+{{- $fieldType := index $Types.TypeByName .RelatedStateVariable.DataType}}
+  // {{.Name}} relates to state variable {{.RelatedStateVariable.Name}}
+{{- with .RelatedStateVariable.AllowedValues}}
+{{- ""}} ({{len .}} standard allowed values)
+{{- end }}.
   {{.Name}} {{$fieldType.Ref}}
 {{- end}}
 {{end -}} }

vendor/golang.org/x/sync/errgroup/errgroup.go

@@ -20,7 +20,7 @@ type token struct{}
 // A zero Group is valid, has no limit on the number of active goroutines,
 // and does not cancel on error.
 type Group struct {
-	cancel func()
+	cancel func(error)
 
 	wg sync.WaitGroup
 
@@ -43,7 +43,7 @@ func (g *Group) done() {
 // returns a non-nil error or the first time Wait returns, whichever occurs
 // first.
 func WithContext(ctx context.Context) (*Group, context.Context) {
-	ctx, cancel := context.WithCancel(ctx)
+	ctx, cancel := withCancelCause(ctx)
 	return &Group{cancel: cancel}, ctx
 }
 
@@ -52,7 +52,7 @@ func WithContext(ctx context.Context) (*Group, context.Context) {
 func (g *Group) Wait() error {
 	g.wg.Wait()
 	if g.cancel != nil {
-		g.cancel()
+		g.cancel(g.err)
 	}
 	return g.err
 }
@@ -76,7 +76,7 @@ func (g *Group) Go(f func() error) {
 			g.errOnce.Do(func() {
 				g.err = err
 				if g.cancel != nil {
-					g.cancel()
+					g.cancel(g.err)
 				}
 			})
 		}
@@ -105,7 +105,7 @@ func (g *Group) TryGo(f func() error) bool {
 			g.errOnce.Do(func() {
 				g.err = err
 				if g.cancel != nil {
-					g.cancel()
+					g.cancel(g.err)
 				}
 			})
 		}

vendor/golang.org/x/sync/errgroup/go120.go

@@ -0,0 +1,13 @@
+// Copyright 2023 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.
+
+//go:build go1.20
+
+package errgroup
+
+import "context"
+
+func withCancelCause(parent context.Context) (context.Context, func(error)) {
+	return context.WithCancelCause(parent)
+}

vendor/golang.org/x/sync/errgroup/pre_go120.go

@@ -0,0 +1,14 @@
+// Copyright 2023 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.
+
+//go:build !go1.20
+
+package errgroup
+
+import "context"
+
+func withCancelCause(parent context.Context) (context.Context, func(error)) {
+	ctx, cancel := context.WithCancel(parent)
+	return ctx, func(error) { cancel() }
+}

vendor/modules.txt

@@ -1,3 +1,3 @@
-# golang.org/x/sync v0.1.0
-## explicit
+# golang.org/x/sync v0.5.0
+## explicit; go 1.18
 golang.org/x/sync/errgroup