674fc566bb
1. Removes separate relay lists and relay clients/services, just makes it a listen address 2. Easier plugging-in of other transports 3. Allows "hot" disabling and enabling NAT services 4. Allows "hot" listen address changes 5. Changes listen address list with a preferable "default" value just like for discovery 6. Debounces global discovery announcements as external addresses change (which it might alot upon starting) 7. Stops this whole "pick other peers relay by latency". This information is no longer available, but I don't think it matters as most of the time other peer only has one relay. 8. Rename ListenAddress to ListenAddresses, as well as in javascript land. 9. Stop serializing deprecated values to JSON GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/2982
145 lines
3.4 KiB
Go
145 lines
3.4 KiB
Go
// Copyright (C) 2015 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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package nat
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import (
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"fmt"
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"net"
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"time"
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"github.com/syncthing/syncthing/lib/sync"
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)
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type MappingChangeSubscriber func(*Mapping, []Address, []Address)
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type Mapping struct {
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protocol Protocol
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address Address
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extAddresses map[string]Address // NAT ID -> Address
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expires time.Time
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subscribers []MappingChangeSubscriber
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mut sync.RWMutex
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}
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func (m *Mapping) setAddress(id string, address Address) {
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m.mut.Lock()
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if existing, ok := m.extAddresses[id]; !ok || !existing.Equal(address) {
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l.Infof("New NAT port mapping: external %s address %s to local address %s.", m.protocol, address, m.address)
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m.extAddresses[id] = address
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}
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m.mut.Unlock()
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}
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func (m *Mapping) removeAddress(id string) {
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m.mut.Lock()
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addr, ok := m.extAddresses[id]
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if ok {
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l.Infof("Removing NAT port mapping: external %s address %s, NAT %s is no longer available.", m.protocol, addr, id)
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delete(m.extAddresses, id)
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}
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m.mut.Unlock()
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}
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func (m *Mapping) clearAddresses() {
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m.mut.Lock()
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var removed []Address
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for id, addr := range m.extAddresses {
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l.Debugf("Clearing mapping %s: ID: %s Address: %s", m, id, addr)
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removed = append(removed, addr)
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delete(m.extAddresses, id)
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}
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if len(removed) > 0 {
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m.notify(nil, removed)
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}
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m.expires = time.Time{}
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m.mut.Unlock()
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}
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func (m *Mapping) notify(added, removed []Address) {
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m.mut.RLock()
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for _, subscriber := range m.subscribers {
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subscriber(m, added, removed)
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}
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m.mut.RUnlock()
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}
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func (m *Mapping) addressMap() map[string]Address {
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m.mut.RLock()
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addrMap := m.extAddresses
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m.mut.RUnlock()
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return addrMap
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}
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func (m *Mapping) Protocol() Protocol {
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return m.protocol
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}
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func (m *Mapping) Address() Address {
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return m.address
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}
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func (m *Mapping) ExternalAddresses() []Address {
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m.mut.RLock()
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addrs := make([]Address, 0, len(m.extAddresses))
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for _, addr := range m.extAddresses {
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addrs = append(addrs, addr)
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}
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m.mut.RUnlock()
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return addrs
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}
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func (m *Mapping) OnChanged(subscribed MappingChangeSubscriber) {
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m.mut.Lock()
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m.subscribers = append(m.subscribers, subscribed)
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m.mut.Unlock()
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}
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func (m *Mapping) String() string {
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return fmt.Sprintf("%s %s", m.protocol, m.address)
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}
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func (m *Mapping) GoString() string {
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return m.String()
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}
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// Checks if the mappings local IP address matches the IP address of the gateway
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// For example, if we are explicitly listening on 192.168.0.12, there is no
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// point trying to acquire a mapping on a gateway to which the local IP is
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// 10.0.0.1. Fallback to true if any of the IPs is not there.
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func (m *Mapping) validGateway(ip net.IP) bool {
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if m.address.IP == nil || ip == nil || m.address.IP.IsUnspecified() || ip.IsUnspecified() {
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return true
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}
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return m.address.IP.Equal(ip)
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}
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// Address is essentially net.TCPAddr yet is more general, and has a few helper
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// methods which reduce boilerplate code.
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type Address struct {
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IP net.IP
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Port int
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}
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func (a Address) Equal(b Address) bool {
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return a.Port == b.Port && a.IP.Equal(b.IP)
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}
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func (a Address) String() string {
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var ipStr string
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if a.IP == nil {
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ipStr = net.IPv4zero.String()
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} else {
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ipStr = a.IP.String()
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}
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return net.JoinHostPort(ipStr, fmt.Sprintf("%d", a.Port))
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}
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func (a Address) GoString() string {
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return a.String()
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}
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