syncthing/lib/upnp/upnp.go

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// Copyright (C) 2014 The Syncthing Authors.
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//
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// Adapted from https://github.com/jackpal/Taipei-Torrent/blob/dd88a8bfac6431c01d959ce3c745e74b8a911793/IGD.go
// Copyright (c) 2010 Jack Palevich (https://github.com/jackpal/Taipei-Torrent/blob/dd88a8bfac6431c01d959ce3c745e74b8a911793/LICENSE)
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Package upnp implements UPnP InternetGatewayDevice discovery, querying, and port mapping.
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package upnp
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import (
"bufio"
"bytes"
"context"
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"encoding/xml"
"errors"
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"fmt"
"io"
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"net"
"net/http"
"net/url"
"strings"
"sync"
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"time"
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"github.com/syncthing/syncthing/lib/build"
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"github.com/syncthing/syncthing/lib/dialer"
"github.com/syncthing/syncthing/lib/nat"
"github.com/syncthing/syncthing/lib/osutil"
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)
func init() {
nat.Register(Discover)
}
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type upnpService struct {
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ID string `xml:"serviceId"`
Type string `xml:"serviceType"`
ControlURL string `xml:"controlURL"`
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}
type upnpDevice struct {
DeviceType string `xml:"deviceType"`
FriendlyName string `xml:"friendlyName"`
Devices []upnpDevice `xml:"deviceList>device"`
Services []upnpService `xml:"serviceList>service"`
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}
type upnpRoot struct {
Device upnpDevice `xml:"device"`
}
// UnsupportedDeviceTypeError for unsupported UPnP device types (i.e upnp:rootdevice)
type UnsupportedDeviceTypeError struct {
deviceType string
}
func (e *UnsupportedDeviceTypeError) Error() string {
return fmt.Sprintf("Unsupported UPnP device of type %s", e.deviceType)
}
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// Discover discovers UPnP InternetGatewayDevices.
// The order in which the devices appear in the results list is not deterministic.
func Discover(ctx context.Context, _, timeout time.Duration) []nat.Device {
var results []nat.Device
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interfaces, err := net.Interfaces()
if err != nil {
l.Infoln("Listing network interfaces:", err)
return results
}
resultChan := make(chan nat.Device)
wg := &sync.WaitGroup{}
for _, intf := range interfaces {
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// Interface flags seem to always be 0 on Windows
if !build.IsWindows && (intf.Flags&net.FlagUp == 0 || intf.Flags&net.FlagMulticast == 0) {
continue
}
for _, deviceType := range []string{"urn:schemas-upnp-org:device:InternetGatewayDevice:1", "urn:schemas-upnp-org:device:InternetGatewayDevice:2"} {
wg.Add(1)
go func(intf net.Interface, deviceType string) {
discover(ctx, &intf, deviceType, timeout, resultChan)
wg.Done()
}(intf, deviceType)
}
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}
go func() {
wg.Wait()
close(resultChan)
}()
seenResults := make(map[string]bool)
for {
select {
case result, ok := <-resultChan:
if !ok {
return results
}
if seenResults[result.ID()] {
l.Debugf("Skipping duplicate result %s", result.ID())
continue
}
results = append(results, result)
seenResults[result.ID()] = true
l.Debugf("UPnP discovery result %s", result.ID())
case <-ctx.Done():
return nil
}
}
}
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// Search for UPnP InternetGatewayDevices for <timeout> seconds.
// The order in which the devices appear in the result list is not deterministic
func discover(ctx context.Context, intf *net.Interface, deviceType string, timeout time.Duration, results chan<- nat.Device) {
ssdp := &net.UDPAddr{IP: []byte{239, 255, 255, 250}, Port: 1900}
tpl := `M-SEARCH * HTTP/1.1
HOST: 239.255.255.250:1900
ST: %s
MAN: "ssdp:discover"
MX: %d
USER-AGENT: syncthing/1.0
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`
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searchStr := fmt.Sprintf(tpl, deviceType, timeout/time.Second)
search := []byte(strings.ReplaceAll(searchStr, "\n", "\r\n") + "\r\n")
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Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Debugln("Starting discovery of device type", deviceType, "on", intf.Name)
socket, err := net.ListenMulticastUDP("udp4", intf, &net.UDPAddr{IP: ssdp.IP})
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if err != nil {
l.Debugln("UPnP discovery: listening to udp multicast:", err)
return
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}
defer socket.Close() // Make sure our socket gets closed
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Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Debugln("Sending search request for device type", deviceType, "on", intf.Name)
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_, err = socket.WriteTo(search, ssdp)
if err != nil {
if e, ok := err.(net.Error); !ok || !e.Timeout() {
l.Debugln("UPnP discovery: sending search request:", err)
}
return
}
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Debugln("Listening for UPnP response for device type", deviceType, "on", intf.Name)
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
// Listen for responses until a timeout is reached or the context is
// cancelled
resp := make([]byte, 65536)
loop:
for {
if err := socket.SetDeadline(time.Now().Add(250 * time.Millisecond)); err != nil {
l.Infoln("UPnP socket:", err)
break
}
n, _, err := socket.ReadFrom(resp)
if err != nil {
select {
case <-ctx.Done():
break loop
default:
}
if e, ok := err.(net.Error); ok && e.Timeout() {
continue // continue reading
}
l.Infoln("UPnP read:", err) //legitimate error, not a timeout.
break
}
igds, err := parseResponse(ctx, deviceType, resp[:n])
if err != nil {
switch err.(type) {
case *UnsupportedDeviceTypeError:
l.Debugln(err.Error())
default:
if !errors.Is(err, context.Canceled) {
l.Infoln("UPnP parse:", err)
}
}
continue
}
for _, igd := range igds {
igd := igd // Copy before sending pointer to the channel.
select {
case results <- &igd:
case <-ctx.Done():
return
}
}
}
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Debugln("Discovery for device type", deviceType, "on", intf.Name, "finished.")
}
func parseResponse(ctx context.Context, deviceType string, resp []byte) ([]IGDService, error) {
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Debugln("Handling UPnP response:\n\n" + string(resp))
reader := bufio.NewReader(bytes.NewBuffer(resp))
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request := &http.Request{}
response, err := http.ReadResponse(reader, request)
if err != nil {
return nil, err
}
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respondingDeviceType := response.Header.Get("St")
if respondingDeviceType != deviceType {
return nil, &UnsupportedDeviceTypeError{deviceType: respondingDeviceType}
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}
deviceDescriptionLocation := response.Header.Get("Location")
if deviceDescriptionLocation == "" {
return nil, errors.New("invalid IGD response: no location specified")
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}
deviceDescriptionURL, err := url.Parse(deviceDescriptionLocation)
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if err != nil {
l.Infoln("Invalid IGD location: " + err.Error())
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}
deviceUSN := response.Header.Get("USN")
if deviceUSN == "" {
return nil, errors.New("invalid IGD response: USN not specified")
}
deviceUUID := strings.TrimPrefix(strings.Split(deviceUSN, "::")[0], "uuid:")
response, err = http.Get(deviceDescriptionLocation)
if err != nil {
return nil, err
}
defer response.Body.Close()
if response.StatusCode >= 400 {
return nil, errors.New("bad status code:" + response.Status)
}
var upnpRoot upnpRoot
err = xml.NewDecoder(response.Body).Decode(&upnpRoot)
if err != nil {
return nil, err
}
// Figure out our IP number, on the network used to reach the IGD.
// We do this in a fairly roundabout way by connecting to the IGD and
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// checking the address of the local end of the socket. I'm open to
// suggestions on a better way to do this...
localIPAddress, err := localIP(ctx, deviceDescriptionURL)
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if err != nil {
return nil, err
}
services, err := getServiceDescriptions(deviceUUID, localIPAddress, deviceDescriptionLocation, upnpRoot.Device)
if err != nil {
return nil, err
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}
return services, nil
}
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func localIP(ctx context.Context, url *url.URL) (net.IP, error) {
timeoutCtx, cancel := context.WithTimeout(ctx, time.Second)
defer cancel()
conn, err := dialer.DialContext(timeoutCtx, "tcp", url.Host)
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if err != nil {
return nil, err
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}
defer conn.Close()
return osutil.IPFromAddr(conn.LocalAddr())
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}
func getChildDevices(d upnpDevice, deviceType string) []upnpDevice {
var result []upnpDevice
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for _, dev := range d.Devices {
if dev.DeviceType == deviceType {
result = append(result, dev)
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}
}
return result
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}
func getChildServices(d upnpDevice, serviceType string) []upnpService {
var result []upnpService
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for _, service := range d.Services {
if service.Type == serviceType {
result = append(result, service)
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}
}
return result
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}
func getServiceDescriptions(deviceUUID string, localIPAddress net.IP, rootURL string, device upnpDevice) ([]IGDService, error) {
var result []IGDService
if device.DeviceType == "urn:schemas-upnp-org:device:InternetGatewayDevice:1" {
descriptions := getIGDServices(deviceUUID, localIPAddress, rootURL, device,
"urn:schemas-upnp-org:device:WANDevice:1",
"urn:schemas-upnp-org:device:WANConnectionDevice:1",
[]string{"urn:schemas-upnp-org:service:WANIPConnection:1", "urn:schemas-upnp-org:service:WANPPPConnection:1"})
result = append(result, descriptions...)
} else if device.DeviceType == "urn:schemas-upnp-org:device:InternetGatewayDevice:2" {
descriptions := getIGDServices(deviceUUID, localIPAddress, rootURL, device,
"urn:schemas-upnp-org:device:WANDevice:2",
"urn:schemas-upnp-org:device:WANConnectionDevice:2",
[]string{"urn:schemas-upnp-org:service:WANIPConnection:2", "urn:schemas-upnp-org:service:WANPPPConnection:2"})
result = append(result, descriptions...)
} else {
return result, errors.New("[" + rootURL + "] Malformed root device description: not an InternetGatewayDevice.")
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}
if len(result) < 1 {
return result, errors.New("[" + rootURL + "] Malformed device description: no compatible service descriptions found.")
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}
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return result, nil
}
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func getIGDServices(deviceUUID string, localIPAddress net.IP, rootURL string, device upnpDevice, wanDeviceURN string, wanConnectionURN string, URNs []string) []IGDService {
var result []IGDService
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devices := getChildDevices(device, wanDeviceURN)
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if len(devices) < 1 {
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Infoln(rootURL, "- malformed InternetGatewayDevice description: no WANDevices specified.")
return result
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}
for _, device := range devices {
connections := getChildDevices(device, wanConnectionURN)
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if len(connections) < 1 {
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Infoln(rootURL, "- malformed ", wanDeviceURN, "description: no WANConnectionDevices specified.")
}
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for _, connection := range connections {
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for _, URN := range URNs {
services := getChildServices(connection, URN)
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l.Debugln(rootURL, "- no services of type", URN, " found on connection.")
for _, service := range services {
if service.ControlURL == "" {
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l.Infoln(rootURL+"- malformed", service.Type, "description: no control URL.")
} else {
u, _ := url.Parse(rootURL)
replaceRawPath(u, service.ControlURL)
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l.Debugln(rootURL, "- found", service.Type, "with URL", u)
service := IGDService{
UUID: deviceUUID,
Device: device,
ServiceID: service.ID,
URL: u.String(),
URN: service.Type,
LocalIP: localIPAddress,
}
result = append(result, service)
}
}
}
}
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}
return result
}
func replaceRawPath(u *url.URL, rp string) {
asURL, err := url.Parse(rp)
if err != nil {
return
} else if asURL.IsAbs() {
u.Path = asURL.Path
u.RawQuery = asURL.RawQuery
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} else {
var p, q string
fs := strings.Split(rp, "?")
p = fs[0]
if len(fs) > 1 {
q = fs[1]
}
if p[0] == '/' {
u.Path = p
} else {
u.Path += p
}
u.RawQuery = q
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}
}
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func soapRequest(ctx context.Context, url, service, function, message string) ([]byte, error) {
tpl := `<?xml version="1.0" ?>
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<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>%s</s:Body>
</s:Envelope>
`
var resp []byte
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body := fmt.Sprintf(tpl, message)
req, err := http.NewRequestWithContext(ctx, "POST", url, strings.NewReader(body))
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if err != nil {
return resp, err
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}
req.Close = true
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req.Header.Set("Content-Type", `text/xml; charset="utf-8"`)
req.Header.Set("User-Agent", "syncthing/1.0")
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req.Header["SOAPAction"] = []string{fmt.Sprintf(`"%s#%s"`, service, function)} // Enforce capitalization in header-entry for sensitive routers. See issue #1696
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req.Header.Set("Connection", "Close")
req.Header.Set("Cache-Control", "no-cache")
req.Header.Set("Pragma", "no-cache")
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Debugln("SOAP Request URL: " + url)
l.Debugln("SOAP Action: " + req.Header.Get("SOAPAction"))
l.Debugln("SOAP Request:\n\n" + body)
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r, err := http.DefaultClient.Do(req)
if err != nil {
l.Debugln("SOAP do:", err)
return resp, err
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}
resp, _ = io.ReadAll(r.Body)
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system.
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l.Debugf("SOAP Response: %s\n\n%s\n\n", r.Status, resp)
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r.Body.Close()
if r.StatusCode >= 400 {
return resp, errors.New(function + ": " + r.Status)
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}
return resp, nil
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}
type soapGetExternalIPAddressResponseEnvelope struct {
XMLName xml.Name
Body soapGetExternalIPAddressResponseBody `xml:"Body"`
}
type soapGetExternalIPAddressResponseBody struct {
XMLName xml.Name
GetExternalIPAddressResponse getExternalIPAddressResponse `xml:"GetExternalIPAddressResponse"`
}
type getExternalIPAddressResponse struct {
NewExternalIPAddress string `xml:"NewExternalIPAddress"`
}
type soapErrorResponse struct {
ErrorCode int `xml:"Body>Fault>detail>UPnPError>errorCode"`
ErrorDescription string `xml:"Body>Fault>detail>UPnPError>errorDescription"`
}