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Update config.go godoc
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@ -1,3 +1,19 @@
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/*
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The config package contains structures related to the configuration of an
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Yggdrasil node.
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The configuration contains, amongst other things, encryption keys which are used
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to derive a node's identity, information about peerings and node information
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that is shared with the network. There are also some module-specific options
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related to TUN/TAP, multicast and the admin socket.
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In order for a node to maintain the same identity across restarts, you should
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persist the configuration onto the filesystem or into some configuration storage
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so that the encryption keys (and therefore the node ID) do not change.
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Note that Yggdrasil will automatically populate sane defaults for any
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configuration option that is not provided.
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*/
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package config
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import (
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@ -8,30 +24,30 @@ import (
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"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
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)
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// NodeState represents the active and previous configuration of the node and
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// protects it with a mutex
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// NodeState represents the active and previous configuration of an Yggdrasil
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// node. A NodeState object is returned when starting an Yggdrasil node. Note
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// that this structure and related functions are likely to disappear soon.
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type NodeState struct {
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Current NodeConfig
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Previous NodeConfig
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Mutex sync.RWMutex
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}
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// Current returns the current node config
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// Current returns the active node configuration.
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func (s *NodeState) GetCurrent() NodeConfig {
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s.Mutex.RLock()
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defer s.Mutex.RUnlock()
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return s.Current
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}
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// Previous returns the previous node config
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// Previous returns the previous node configuration.
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func (s *NodeState) GetPrevious() NodeConfig {
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s.Mutex.RLock()
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defer s.Mutex.RUnlock()
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return s.Previous
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}
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// Replace the node configuration with new configuration. This method returns
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// both the new and the previous node configs
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// Replace the node configuration with new configuration.
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func (s *NodeState) Replace(n NodeConfig) {
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s.Mutex.Lock()
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defer s.Mutex.Unlock()
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@ -39,7 +55,9 @@ func (s *NodeState) Replace(n NodeConfig) {
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s.Current = n
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}
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// NodeConfig defines all configuration values needed to run a signle yggdrasil node
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// NodeConfig is the main configuration structure, containing configuration
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// options that are necessary for an Yggdrasil node to run. You will need to
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// supply one of these structs to the Yggdrasil core when starting a node.
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type NodeConfig struct {
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Peers []string `comment:"List of connection strings for outbound peer connections in URI format,\ne.g. tcp://a.b.c.d:e or socks://a.b.c.d:e/f.g.h.i:j. These connections\nwill obey the operating system routing table, therefore you should\nuse this section when you may connect via different interfaces."`
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InterfacePeers map[string][]string `comment:"List of connection strings for outbound peer connections in URI format,\narranged by source interface, e.g. { \"eth0\": [ tcp://a.b.c.d:e ] }.\nNote that SOCKS peerings will NOT be affected by this option and should\ngo in the \"Peers\" section instead."`
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@ -62,7 +80,7 @@ type NodeConfig struct {
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NodeInfo map[string]interface{} `comment:"Optional node info. This must be a { \"key\": \"value\", ... } map\nor set as null. This is entirely optional but, if set, is visible\nto the whole network on request."`
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}
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// SessionFirewall controls the session firewall configuration
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// SessionFirewall controls the session firewall configuration.
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type SessionFirewall struct {
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Enable bool `comment:"Enable or disable the session firewall. If disabled, network traffic\nfrom any node will be allowed. If enabled, the below rules apply."`
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AllowFromDirect bool `comment:"Allow network traffic from directly connected peers."`
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@ -72,7 +90,8 @@ type SessionFirewall struct {
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BlacklistEncryptionPublicKeys []string `comment:"List of public keys from which network traffic is always rejected,\nregardless of the whitelist, AllowFromDirect or AllowFromRemote."`
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}
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// TunnelRouting contains the crypto-key routing tables for tunneling
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// TunnelRouting contains the crypto-key routing tables for tunneling regular
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// IPv4 or IPv6 subnets across the Yggdrasil network.
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type TunnelRouting struct {
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Enable bool `comment:"Enable or disable tunnel routing."`
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IPv6RemoteSubnets map[string]string `comment:"IPv6 subnets belonging to remote nodes, mapped to the node's public\nkey, e.g. { \"aaaa:bbbb:cccc::/e\": \"boxpubkey\", ... }"`
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@ -81,18 +100,15 @@ type TunnelRouting struct {
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IPv4LocalSubnets []string `comment:"IPv4 subnets belonging to this node's end of the tunnels. Only traffic\nfrom these ranges will be tunnelled."`
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}
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// SwitchOptions contains tuning options for the switch
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// SwitchOptions contains tuning options for the switch. These are advanced
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// options and shouldn't be changed unless necessary.
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type SwitchOptions struct {
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MaxTotalQueueSize uint64 `comment:"Maximum size of all switch queues combined (in bytes)."`
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}
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// Generates default configuration. This is used when outputting the -genconf
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// parameter and also when using -autoconf. The isAutoconf flag is used to
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// determine whether the operating system should select a free port by itself
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// (which guarantees that there will not be a conflict with any other services)
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// or whether to generate a random port number. The only side effect of setting
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// isAutoconf is that the TCP and UDP ports will likely end up with different
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// port numbers.
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// Generates default configuration and returns a pointer to the resulting
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// NodeConfig. This is used when outputting the -genconf parameter and also when
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// using -autoconf.
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func GenerateConfig() *NodeConfig {
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// Generate encryption keys.
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bpub, bpriv := crypto.NewBoxKeys()
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@ -122,16 +138,19 @@ func GenerateConfig() *NodeConfig {
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return &cfg
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}
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// NewEncryptionKeys generates a new encryption keypair. The encryption keys are
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// used to encrypt traffic and to derive the IPv6 address/subnet of the node.
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// NewEncryptionKeys replaces the encryption keypair in the NodeConfig with a
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// new encryption keypair. The encryption keys are used by the router to encrypt
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// traffic and to derive the node ID and IPv6 address/subnet of the node, so
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// this is equivalent to discarding the node's identity on the network.
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func (cfg *NodeConfig) NewEncryptionKeys() {
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bpub, bpriv := crypto.NewBoxKeys()
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cfg.EncryptionPublicKey = hex.EncodeToString(bpub[:])
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cfg.EncryptionPrivateKey = hex.EncodeToString(bpriv[:])
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}
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// NewSigningKeys generates a new signing keypair. The signing keys are used to
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// derive the structure of the spanning tree.
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// NewSigningKeys replaces the signing keypair in the NodeConfig with a new
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// signing keypair. The signing keys are used by the switch to derive the
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// structure of the spanning tree.
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func (cfg *NodeConfig) NewSigningKeys() {
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spub, spriv := crypto.NewSigKeys()
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cfg.SigningPublicKey = hex.EncodeToString(spub[:])
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