func createDNSServer(config dnsConfig, router *mesh.Router, isKnownPeer func(mesh.PeerName) bool) (*nameserver.Nameserver, *nameserver.DNSServer) {
ns := nameserver.New(router.Ourself.Peer.Name, config.Domain, isKnownPeer)
router.Peers.OnGC(func(peer *mesh.Peer) { ns.PeerGone(peer.Name) })
ns.SetGossip(router.NewGossip("nameserver", ns))
dnsserver, err := nameserver.NewDNSServer(ns, config.Domain, config.ListenAddress,
config.EffectiveListenAddress, uint32(config.TTL), config.ClientTimeout)
if err != nil {
Log.Fatal("Unable to start dns server: ", err)
}
listenAddr := config.ListenAddress
if config.EffectiveListenAddress != "" {
listenAddr = config.EffectiveListenAddress
}
Log.Println("Listening for DNS queries on", listenAddr)
return ns, dnsserver
}
func main() {
procs := runtime.NumCPU()
// packet sniffing can block an OS thread, so we need one thread
// for that plus at least one more.
if procs < 2 {
procs = 2
}
runtime.GOMAXPROCS(procs)
var (
config weave.Config
justVersion bool
protocolMinVersion int
ifaceName string
routerName string
nickName string
password string
wait int
pktdebug bool
logLevel string
prof string
bufSzMB int
noDiscovery bool
httpAddr string
iprangeCIDR string
ipsubnetCIDR string
peerCount int
apiPath string
peers []string
noDNS bool
dnsDomain string
dnsPort int
dnsTTL int
dnsClientTimeout time.Duration
)
mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
mflag.IntVar(&config.Port, []string{"#port", "-port"}, weave.Port, "router port")
mflag.IntVar(&protocolMinVersion, []string{"-min-protocol-version"}, weave.ProtocolMinVersion, "minimum weave protocol version")
mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to capture/inject from (disabled if blank)")
mflag.StringVar(&routerName, []string{"#name", "-name"}, "", "name of router (defaults to MAC of interface)")
mflag.StringVar(&nickName, []string{"#nickname", "-nickname"}, "", "nickname of peer (defaults to hostname)")
mflag.StringVar(&password, []string{"#password", "-password"}, "", "network password")
mflag.IntVar(&wait, []string{"#wait", "-wait"}, -1, "number of seconds to wait for interface to come up (0=don't wait, -1=wait forever)")
mflag.StringVar(&logLevel, []string{"-log-level"}, "info", "logging level (debug, info, warning, error)")
mflag.BoolVar(&pktdebug, []string{"#pktdebug", "#-pktdebug", "-pkt-debug"}, false, "enable per-packet debug logging")
mflag.StringVar(&prof, []string{"#profile", "-profile"}, "", "enable profiling and write profiles to given path")
mflag.IntVar(&config.ConnLimit, []string{"#connlimit", "#-connlimit", "-conn-limit"}, 30, "connection limit (0 for unlimited)")
mflag.BoolVar(&noDiscovery, []string{"#nodiscovery", "#-nodiscovery", "-no-discovery"}, false, "disable peer discovery")
mflag.IntVar(&bufSzMB, []string{"#bufsz", "-bufsz"}, 8, "capture buffer size in MB")
mflag.StringVar(&httpAddr, []string{"#httpaddr", "#-httpaddr", "-http-addr"}, fmt.Sprintf(":%d", weave.HTTPPort), "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
mflag.StringVar(&iprangeCIDR, []string{"#iprange", "#-iprange", "-ipalloc-range"}, "", "IP address range reserved for automatic allocation, in CIDR notation")
mflag.StringVar(&ipsubnetCIDR, []string{"#ipsubnet", "#-ipsubnet", "-ipalloc-default-subnet"}, "", "subnet to allocate within by default, in CIDR notation")
mflag.IntVar(&peerCount, []string{"#initpeercount", "#-initpeercount", "-init-peer-count"}, 0, "number of peers in network (for IP address allocation)")
mflag.StringVar(&apiPath, []string{"#api", "-api"}, "unix:///var/run/docker.sock", "Path to Docker API socket")
mflag.BoolVar(&noDNS, []string{"-no-dns"}, false, "disable DNS server")
mflag.StringVar(&dnsDomain, []string{"-dns-domain"}, nameserver.DefaultDomain, "local domain to server requests for")
mflag.IntVar(&dnsPort, []string{"-dns-port"}, nameserver.DefaultPort, "port to listen on for DNS requests")
mflag.IntVar(&dnsTTL, []string{"-dns-ttl"}, nameserver.DefaultTTL, "TTL for DNS request from our domain")
mflag.DurationVar(&dnsClientTimeout, []string{"-dns-fallback-timeout"}, nameserver.DefaultClientTimeout, "timeout for fallback DNS requests")
mflag.Parse()
peers = mflag.Args()
SetLogLevel(logLevel)
if justVersion {
fmt.Printf("weave router %s\n", version)
os.Exit(0)
}
Log.Println("Command line options:", options())
Log.Println("Command line peers:", peers)
if protocolMinVersion < weave.ProtocolMinVersion || protocolMinVersion > weave.ProtocolMaxVersion {
Log.Fatalf("--min-protocol-version must be in range [%d,%d]", weave.ProtocolMinVersion, weave.ProtocolMaxVersion)
}
config.ProtocolMinVersion = byte(protocolMinVersion)
var err error
if ifaceName != "" {
config.Iface, err = weavenet.EnsureInterface(ifaceName, wait)
if err != nil {
Log.Fatal(err)
}
}
if routerName == "" {
if config.Iface == nil {
Log.Fatal("Either an interface must be specified with --iface or a name with -name")
}
routerName = config.Iface.HardwareAddr.String()
}
name, err := weave.PeerNameFromUserInput(routerName)
if err != nil {
Log.Fatal(err)
}
if nickName == "" {
nickName, err = os.Hostname()
if err != nil {
Log.Fatal(err)
}
}
if password == "" {
password = os.Getenv("WEAVE_PASSWORD")
}
if password == "" {
Log.Println("Communication between peers is unencrypted.")
} else {
config.Password = []byte(password)
Log.Println("Communication between peers is encrypted.")
}
if prof != "" {
p := *profile.CPUProfile
p.ProfilePath = prof
p.NoShutdownHook = true
defer profile.Start(&p).Stop()
}
config.BufSz = bufSzMB * 1024 * 1024
config.LogFrame = logFrameFunc(pktdebug)
config.PeerDiscovery = !noDiscovery
router := weave.NewRouter(config, name, nickName)
Log.Println("Our name is", router.Ourself)
dockerCli, err := docker.NewClient(apiPath)
if err != nil {
Log.Fatal("Unable to start docker client: ", err)
}
var allocator *ipam.Allocator
var defaultSubnet address.CIDR
if iprangeCIDR != "" {
allocator, defaultSubnet = createAllocator(router, iprangeCIDR, ipsubnetCIDR, determineQuorum(peerCount, peers))
if err = dockerCli.AddObserver(allocator); err != nil {
Log.Fatal("Unable to start watcher", err)
}
} else if peerCount > 0 {
Log.Fatal("--init-peer-count flag specified without --ipalloc-range")
}
var (
ns *nameserver.Nameserver
dnsserver *nameserver.DNSServer
)
if !noDNS {
ns = nameserver.New(router.Ourself.Peer.Name, router.Peers, dockerCli, dnsDomain)
ns.SetGossip(router.NewGossip("nameserver", ns))
if err = dockerCli.AddObserver(ns); err != nil {
Log.Fatal("Unable to start watcher", err)
}
ns.Start()
defer ns.Stop()
dnsserver, err = nameserver.NewDNSServer(ns, dnsDomain, dnsPort, uint32(dnsTTL), dnsClientTimeout)
if err != nil {
Log.Fatal("Unable to start dns server: ", err)
}
dnsserver.ActivateAndServe()
defer dnsserver.Stop()
}
router.Start()
if errors := router.ConnectionMaker.InitiateConnections(peers, false); len(errors) > 0 {
Log.Fatal(errorMessages(errors))
}
// The weave script always waits for a status call to succeed,
// so there is no point in doing "weave launch --http-addr ''".
// This is here to support stand-alone use of weaver.
if httpAddr != "" {
go handleHTTP(router, httpAddr, allocator, defaultSubnet, dockerCli, ns, dnsserver)
}
SignalHandlerLoop(router)
}
func main() {
var (
justVersion bool
dockerCli *docker.Client
ifaceName string
apiPath string
domain string
dnsPort int
httpIfaceName string
httpPort int
wait int
ttl int
negTTL int
timeout int
udpbuf int
fallback string
refreshInterval int
relevantTime int
maxAnswers int
cacheLen int
cacheDisabled bool
watch bool
logLevel string
err error
)
mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to use for multicast")
mflag.StringVar(&apiPath, []string{"#api", "-api"}, "unix:///var/run/docker.sock", "path to Docker API socket")
mflag.StringVar(&domain, []string{"#domain", "-domain"}, weavedns.DefaultLocalDomain, "local domain (ie, 'weave.local.')")
mflag.IntVar(&wait, []string{"#wait", "-wait"}, -1, "number of seconds to wait for interfaces to come up (0=don't wait, -1=wait forever)")
mflag.IntVar(&dnsPort, []string{"#dnsport", "#-dnsport", "-dns-port"}, weavedns.DefaultServerPort, "port to listen to DNS requests")
mflag.StringVar(&httpIfaceName, []string{"#httpiface", "#-httpiface", "-http-iface"}, "", "interface on which to listen for HTTP requests (empty string means listen on all interfaces)")
mflag.IntVar(&httpPort, []string{"#httpport", "#-httpport", "-http-port"}, weavedns.DefaultHTTPPort, "port to listen to HTTP requests")
mflag.IntVar(&cacheLen, []string{"#cache", "-cache"}, weavedns.DefaultCacheLen, "cache length")
mflag.IntVar(&ttl, []string{"#ttl", "-ttl"}, weavedns.DefaultLocalTTL, "TTL (in secs) for responses for local names")
mflag.BoolVar(&watch, []string{"#watch", "-watch"}, true, "watch the docker socket for container events")
mflag.StringVar(&logLevel, []string{"-log-level"}, "info", "logging level (debug, info, warning, error)")
// advanced options
mflag.IntVar(&negTTL, []string{"#neg-ttl", "-neg-ttl"}, 0, "negative TTL (in secs) for unanswered queries for local names (0=same value as --ttl")
mflag.IntVar(&refreshInterval, []string{"#refresh", "-refresh"}, weavedns.DefaultRefreshInterval, "refresh interval (in secs) for local names (0=disable)")
mflag.IntVar(&maxAnswers, []string{"#max-answers", "#-max-answers", "-dns-max-answers"}, weavedns.DefaultMaxAnswers, "maximum number of answers returned to clients (0=unlimited)")
mflag.IntVar(&relevantTime, []string{"#relevant", "-relevant"}, weavedns.DefaultRelevantTime, "life time for info in the absence of queries (in secs)")
mflag.IntVar(&udpbuf, []string{"#udpbuf", "#-udpbuf", "-dns-udpbuf"}, weavedns.DefaultUDPBuflen, "UDP buffer length for DNS")
mflag.IntVar(&timeout, []string{"#timeout", "#-timeout", "-dns-timeout"}, weavedns.DefaultTimeout, "timeout for resolutions (in millisecs)")
mflag.BoolVar(&cacheDisabled, []string{"#no-cache", "-no-cache"}, false, "disable the cache")
mflag.StringVar(&fallback, []string{"#fallback", "#-fallback", "-dns-fallback"}, "", "force a fallback server (ie, '8.8.8.8:53') (instead of /etc/resolv.conf values)")
mflag.Parse()
if justVersion {
fmt.Printf("weave DNS %s\n", version)
os.Exit(0)
}
SetLogLevel(logLevel)
Log.Infof("[main] WeaveDNS version %s", version) // first thing in log: the version
var iface *net.Interface
if ifaceName != "" {
var err error
Log.Infoln("[main] Waiting for mDNS interface", ifaceName, "to come up")
iface, err = weavenet.EnsureInterface(ifaceName, wait)
if err != nil {
Log.Fatal(err)
} else {
Log.Infoln("[main] Interface", ifaceName, "is up")
}
}
var httpIP string
if httpIfaceName == "" {
httpIP = "0.0.0.0"
} else {
Log.Infoln("[main] Waiting for HTTP interface", httpIfaceName, "to come up")
httpIface, err := weavenet.EnsureInterface(httpIfaceName, wait)
if err != nil {
Log.Fatal(err)
}
Log.Infoln("[main] Interface", httpIfaceName, "is up")
addrs, err := httpIface.Addrs()
if err != nil {
Log.Fatal(err)
}
if len(addrs) == 0 {
Log.Fatal("[main] No addresses on HTTP interface")
}
ip, _, err := net.ParseCIDR(addrs[0].String())
if err != nil {
Log.Fatal(err)
}
httpIP = ip.String()
}
httpAddr := net.JoinHostPort(httpIP, strconv.Itoa(httpPort))
zoneConfig := weavedns.ZoneConfig{
Domain: domain,
Iface: iface,
LocalTTL: ttl,
RefreshInterval: refreshInterval,
RelevantTime: relevantTime,
}
zone, err := weavedns.NewZoneDb(zoneConfig)
if err != nil {
Log.Fatal("[main] Unable to initialize the Zone database", err)
}
if err := zone.Start(); err != nil {
Log.Fatal("[main] Unable to start the Zone database", err)
}
defer zone.Stop()
dockerCli, err = docker.NewClient(apiPath)
if err != nil {
Log.Fatal("[main] Unable to start docker client: ", err)
}
if watch {
err := dockerCli.AddObserver(zone)
if err != nil {
Log.Fatal("[main] Unable to start watcher", err)
}
}
srvConfig := weavedns.DNSServerConfig{
Zone: zone,
Port: dnsPort,
CacheLen: cacheLen,
LocalTTL: ttl,
CacheNegLocalTTL: negTTL,
MaxAnswers: maxAnswers,
Timeout: timeout,
UDPBufLen: udpbuf,
CacheDisabled: cacheDisabled,
}
if len(fallback) > 0 {
fallbackHost, fallbackPort, err := net.SplitHostPort(fallback)
if err != nil {
Log.Fatal("[main] Could not parse fallback host and port", err)
}
srvConfig.UpstreamCfg = &dns.ClientConfig{Servers: []string{fallbackHost}, Port: fallbackPort}
Log.Debugf("[main] DNS fallback at %s:%s", fallbackHost, fallbackPort)
}
srv, err := weavedns.NewDNSServer(srvConfig)
if err != nil {
Log.Fatal("[main] Failed to initialize the WeaveDNS server", err)
}
httpListener, err := net.Listen("tcp", httpAddr)
if err != nil {
Log.Fatal("[main] Unable to create http listener: ", err)
}
Log.Infoln("[main] HTTP API listening on", httpAddr)
go SignalHandlerLoop(srv)
go weavedns.ServeHTTP(httpListener, version, srv, dockerCli)
err = srv.Start()
if err != nil {
Log.Fatal("[main] Failed to start the WeaveDNS server: ", err)
}
srv.ActivateAndServe()
}
func main() {
procs := runtime.NumCPU()
// packet sniffing can block an OS thread, so we need one thread
// for that plus at least one more.
if procs < 2 {
procs = 2
}
runtime.GOMAXPROCS(procs)
var (
config weave.Config
justVersion bool
protocolMinVersion int
ifaceName string
routerName string
nickName string
password string
pktdebug bool
logLevel string
prof string
bufSzMB int
noDiscovery bool
httpAddr string
iprangeCIDR string
ipsubnetCIDR string
peerCount int
dockerAPI string
peers []string
noDNS bool
dnsDomain string
dnsListenAddress string
dnsTTL int
dnsClientTimeout time.Duration
dnsEffectiveListenAddress string
iface *net.Interface
)
mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
mflag.IntVar(&config.Port, []string{"#port", "-port"}, weave.Port, "router port")
mflag.IntVar(&protocolMinVersion, []string{"-min-protocol-version"}, weave.ProtocolMinVersion, "minimum weave protocol version")
mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to capture/inject from (disabled if blank)")
mflag.StringVar(&routerName, []string{"#name", "-name"}, "", "name of router (defaults to MAC of interface)")
mflag.StringVar(&nickName, []string{"#nickname", "-nickname"}, "", "nickname of peer (defaults to hostname)")
mflag.StringVar(&password, []string{"#password", "-password"}, "", "network password")
mflag.StringVar(&logLevel, []string{"-log-level"}, "info", "logging level (debug, info, warning, error)")
mflag.BoolVar(&pktdebug, []string{"#pktdebug", "#-pktdebug", "-pkt-debug"}, false, "enable per-packet debug logging")
mflag.StringVar(&prof, []string{"#profile", "-profile"}, "", "enable profiling and write profiles to given path")
mflag.IntVar(&config.ConnLimit, []string{"#connlimit", "#-connlimit", "-conn-limit"}, 30, "connection limit (0 for unlimited)")
mflag.BoolVar(&noDiscovery, []string{"#nodiscovery", "#-nodiscovery", "-no-discovery"}, false, "disable peer discovery")
mflag.IntVar(&bufSzMB, []string{"#bufsz", "-bufsz"}, 8, "capture buffer size in MB")
mflag.StringVar(&httpAddr, []string{"#httpaddr", "#-httpaddr", "-http-addr"}, fmt.Sprintf(":%d", weave.HTTPPort), "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
mflag.StringVar(&iprangeCIDR, []string{"#iprange", "#-iprange", "-ipalloc-range"}, "", "IP address range reserved for automatic allocation, in CIDR notation")
mflag.StringVar(&ipsubnetCIDR, []string{"#ipsubnet", "#-ipsubnet", "-ipalloc-default-subnet"}, "", "subnet to allocate within by default, in CIDR notation")
mflag.IntVar(&peerCount, []string{"#initpeercount", "#-initpeercount", "-init-peer-count"}, 0, "number of peers in network (for IP address allocation)")
mflag.StringVar(&dockerAPI, []string{"#api", "#-api", "-docker-api"}, "", "Docker API endpoint, e.g. unix:///var/run/docker.sock")
mflag.BoolVar(&noDNS, []string{"-no-dns"}, false, "disable DNS server")
mflag.StringVar(&dnsDomain, []string{"-dns-domain"}, nameserver.DefaultDomain, "local domain to server requests for")
mflag.StringVar(&dnsListenAddress, []string{"-dns-listen-address"}, nameserver.DefaultListenAddress, "address to listen on for DNS requests")
mflag.IntVar(&dnsTTL, []string{"-dns-ttl"}, nameserver.DefaultTTL, "TTL for DNS request from our domain")
mflag.DurationVar(&dnsClientTimeout, []string{"-dns-fallback-timeout"}, nameserver.DefaultClientTimeout, "timeout for fallback DNS requests")
mflag.StringVar(&dnsEffectiveListenAddress, []string{"-dns-effective-listen-address"}, "", "address DNS will actually be listening, after Docker port mapping")
// crude way of detecting that we probably have been started in a
// container, with `weave launch` --> suppress misleading paths in
// mflags error messages.
if os.Args[0] == "/home/weave/weaver" { // matches the Dockerfile ENTRYPOINT
os.Args[0] = "weave"
mflag.CommandLine.Init("weave", mflag.ExitOnError)
}
mflag.Parse()
peers = mflag.Args()
SetLogLevel(logLevel)
if justVersion {
fmt.Printf("weave router %s\n", version)
os.Exit(0)
}
Log.Println("Command line options:", options())
Log.Println("Command line peers:", peers)
if protocolMinVersion < weave.ProtocolMinVersion || protocolMinVersion > weave.ProtocolMaxVersion {
Log.Fatalf("--min-protocol-version must be in range [%d,%d]", weave.ProtocolMinVersion, weave.ProtocolMaxVersion)
}
config.ProtocolMinVersion = byte(protocolMinVersion)
var err error
if ifaceName != "" {
iface, err := weavenet.EnsureInterface(ifaceName)
if err != nil {
Log.Fatal(err)
}
// bufsz flag is in MB
config.Bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024)
if err != nil {
Log.Fatal(err)
}
}
if routerName == "" {
if iface == nil {
Log.Fatal("Either an interface must be specified with --iface or a name with -name")
}
routerName = iface.HardwareAddr.String()
}
name, err := weave.PeerNameFromUserInput(routerName)
if err != nil {
Log.Fatal(err)
}
if nickName == "" {
nickName, err = os.Hostname()
if err != nil {
Log.Fatal(err)
}
}
if password == "" {
password = os.Getenv("WEAVE_PASSWORD")
}
if password == "" {
Log.Println("Communication between peers is unencrypted.")
} else {
config.Password = []byte(password)
Log.Println("Communication between peers is encrypted.")
}
if prof != "" {
p := *profile.CPUProfile
p.ProfilePath = prof
p.NoShutdownHook = true
defer profile.Start(&p).Stop()
}
config.PeerDiscovery = !noDiscovery
config.Overlay = weave.NewSleeveOverlay(config.Port)
if pktdebug {
config.PacketLogging = packetLogging{}
} else {
config.PacketLogging = nopPacketLogging{}
}
router := weave.NewRouter(config, name, nickName)
Log.Println("Our name is", router.Ourself)
var dockerCli *docker.Client
if dockerAPI != "" {
dc, err := docker.NewClient(dockerAPI)
if err != nil {
Log.Fatal("Unable to start docker client: ", err)
}
dockerCli = dc
}
observeContainers := func(o docker.ContainerObserver) {
if dockerCli != nil {
if err = dockerCli.AddObserver(o); err != nil {
Log.Fatal("Unable to start watcher", err)
}
}
}
var allocator *ipam.Allocator
var defaultSubnet address.CIDR
if iprangeCIDR != "" {
allocator, defaultSubnet = createAllocator(router, iprangeCIDR, ipsubnetCIDR, determineQuorum(peerCount, peers))
observeContainers(allocator)
} else if peerCount > 0 {
Log.Fatal("--init-peer-count flag specified without --ipalloc-range")
}
var (
ns *nameserver.Nameserver
dnsserver *nameserver.DNSServer
)
if !noDNS {
ns = nameserver.New(router.Ourself.Peer.Name, router.Peers, dnsDomain)
ns.SetGossip(router.NewGossip("nameserver", ns))
observeContainers(ns)
ns.Start()
defer ns.Stop()
dnsserver, err = nameserver.NewDNSServer(ns, dnsDomain, dnsListenAddress,
dnsEffectiveListenAddress, uint32(dnsTTL), dnsClientTimeout)
if err != nil {
Log.Fatal("Unable to start dns server: ", err)
}
dnsserver.ActivateAndServe()
defer dnsserver.Stop()
}
router.Start()
if errors := router.ConnectionMaker.InitiateConnections(peers, false); len(errors) > 0 {
Log.Fatal(ErrorMessages(errors))
}
// The weave script always waits for a status call to succeed,
// so there is no point in doing "weave launch --http-addr ''".
// This is here to support stand-alone use of weaver.
if httpAddr != "" {
muxRouter := mux.NewRouter()
if allocator != nil {
allocator.HandleHTTP(muxRouter, defaultSubnet, dockerCli)
}
if ns != nil {
ns.HandleHTTP(muxRouter, dockerCli)
}
router.HandleHTTP(muxRouter)
HandleHTTP(muxRouter, version, router, allocator, defaultSubnet, ns, dnsserver)
http.Handle("/", muxRouter)
go listenAndServeHTTP(httpAddr, muxRouter)
}
SignalHandlerLoop(router)
}
func main() {
procs := runtime.NumCPU()
// packet sniffing can block an OS thread, so we need one thread
// for that plus at least one more.
if procs < 2 {
procs = 2
}
runtime.GOMAXPROCS(procs)
var (
// flags that cause immediate exit
justVersion bool
createDatapath bool
deleteDatapath bool
addDatapathInterface string
config mesh.Config
networkConfig weave.NetworkConfig
protocolMinVersion int
ifaceName string
routerName string
nickName string
password string
pktdebug bool
logLevel string
prof string
bufSzMB int
noDiscovery bool
httpAddr string
iprangeCIDR string
ipsubnetCIDR string
peerCount int
dockerAPI string
peers []string
noDNS bool
dnsDomain string
dnsListenAddress string
dnsTTL int
dnsClientTimeout time.Duration
dnsEffectiveListenAddress string
iface *net.Interface
datapathName string
trustedSubnetStr string
defaultDockerHost = "unix:///var/run/docker.sock"
)
if val := os.Getenv("DOCKER_HOST"); val != "" {
defaultDockerHost = val
}
mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
mflag.BoolVar(&createDatapath, []string{"-create-datapath"}, false, "create ODP datapath and exit")
mflag.BoolVar(&deleteDatapath, []string{"-delete-datapath"}, false, "delete ODP datapath and exit")
mflag.StringVar(&addDatapathInterface, []string{"-add-datapath-iface"}, "", "add a network interface to the ODP datapath and exit")
mflag.IntVar(&config.Port, []string{"#port", "-port"}, mesh.Port, "router port")
mflag.IntVar(&protocolMinVersion, []string{"-min-protocol-version"}, mesh.ProtocolMinVersion, "minimum weave protocol version")
mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to capture/inject from (disabled if blank)")
mflag.StringVar(&routerName, []string{"#name", "-name"}, "", "name of router (defaults to MAC of interface)")
mflag.StringVar(&nickName, []string{"#nickname", "-nickname"}, "", "nickname of peer (defaults to hostname)")
mflag.StringVar(&password, []string{"#password", "-password"}, "", "network password")
mflag.StringVar(&logLevel, []string{"-log-level"}, "info", "logging level (debug, info, warning, error)")
mflag.BoolVar(&pktdebug, []string{"#pktdebug", "#-pktdebug", "-pkt-debug"}, false, "enable per-packet debug logging")
mflag.StringVar(&prof, []string{"#profile", "-profile"}, "", "enable profiling and write profiles to given path")
mflag.IntVar(&config.ConnLimit, []string{"#connlimit", "#-connlimit", "-conn-limit"}, 30, "connection limit (0 for unlimited)")
mflag.BoolVar(&noDiscovery, []string{"#nodiscovery", "#-nodiscovery", "-no-discovery"}, false, "disable peer discovery")
mflag.IntVar(&bufSzMB, []string{"#bufsz", "-bufsz"}, 8, "capture buffer size in MB")
mflag.StringVar(&httpAddr, []string{"#httpaddr", "#-httpaddr", "-http-addr"}, "", "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
mflag.StringVar(&iprangeCIDR, []string{"#iprange", "#-iprange", "-ipalloc-range"}, "", "IP address range reserved for automatic allocation, in CIDR notation")
mflag.StringVar(&ipsubnetCIDR, []string{"#ipsubnet", "#-ipsubnet", "-ipalloc-default-subnet"}, "", "subnet to allocate within by default, in CIDR notation")
mflag.IntVar(&peerCount, []string{"#initpeercount", "#-initpeercount", "-init-peer-count"}, 0, "number of peers in network (for IP address allocation)")
mflag.StringVar(&dockerAPI, []string{"#api", "#-api", "-docker-api"}, defaultDockerHost, "Docker API endpoint")
mflag.BoolVar(&noDNS, []string{"-no-dns"}, false, "disable DNS server")
mflag.StringVar(&dnsDomain, []string{"-dns-domain"}, nameserver.DefaultDomain, "local domain to server requests for")
mflag.StringVar(&dnsListenAddress, []string{"-dns-listen-address"}, nameserver.DefaultListenAddress, "address to listen on for DNS requests")
mflag.IntVar(&dnsTTL, []string{"-dns-ttl"}, nameserver.DefaultTTL, "TTL for DNS request from our domain")
mflag.DurationVar(&dnsClientTimeout, []string{"-dns-fallback-timeout"}, nameserver.DefaultClientTimeout, "timeout for fallback DNS requests")
mflag.StringVar(&dnsEffectiveListenAddress, []string{"-dns-effective-listen-address"}, "", "address DNS will actually be listening, after Docker port mapping")
mflag.StringVar(&datapathName, []string{"-datapath"}, "", "ODP datapath name")
mflag.StringVar(&trustedSubnetStr, []string{"-trusted-subnets"}, "", "Command separated list of trusted subnets in CIDR notation")
// crude way of detecting that we probably have been started in a
// container, with `weave launch` --> suppress misleading paths in
// mflags error messages.
if os.Args[0] == "/home/weave/weaver" { // matches the Dockerfile ENTRYPOINT
os.Args[0] = "weave"
mflag.CommandLine.Init("weave", mflag.ExitOnError)
}
mflag.Parse()
peers = mflag.Args()
SetLogLevel(logLevel)
switch {
case justVersion:
fmt.Printf("weave router %s\n", version)
os.Exit(0)
case createDatapath:
odpSupported, err := odp.CreateDatapath(datapathName)
if !odpSupported {
if err != nil {
Log.Error(err)
}
// When the kernel lacks ODP support, exit
// with a special status to distinguish it for
// the weave script.
os.Exit(17)
}
checkFatal(err)
os.Exit(0)
case deleteDatapath:
checkFatal(odp.DeleteDatapath(datapathName))
os.Exit(0)
case addDatapathInterface != "":
checkFatal(odp.AddDatapathInterface(datapathName, addDatapathInterface))
os.Exit(0)
}
Log.Println("Command line options:", options())
Log.Println("Command line peers:", peers)
if protocolMinVersion < mesh.ProtocolMinVersion || protocolMinVersion > mesh.ProtocolMaxVersion {
Log.Fatalf("--min-protocol-version must be in range [%d,%d]", mesh.ProtocolMinVersion, mesh.ProtocolMaxVersion)
}
config.ProtocolMinVersion = byte(protocolMinVersion)
overlays := weave.NewOverlaySwitch()
if datapathName != "" {
// A datapath name implies that "Bridge" and "Overlay"
// packet handling use fast datapath, although other
// options can override that below. Even if both
// things are overridden, we might need bridging on
// the datapath.
fastdp, err := weave.NewFastDatapath(datapathName, config.Port)
checkFatal(err)
networkConfig.Bridge = fastdp.Bridge()
overlays.Add("fastdp", fastdp.Overlay())
}
sleeve := weave.NewSleeveOverlay(config.Port)
overlays.Add("sleeve", sleeve)
overlays.SetCompatOverlay(sleeve)
if ifaceName != "" {
// -iface can coexist with -datapath, because
// pcap-based packet capture is a bit more efficient
// than capture via ODP misses, even when using an
// ODP-based bridge. So when using weave encyption,
// it's preferable to use -iface.
var err error
iface, err = weavenet.EnsureInterface(ifaceName)
checkFatal(err)
// bufsz flag is in MB
networkConfig.Bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024)
checkFatal(err)
}
if password == "" {
password = os.Getenv("WEAVE_PASSWORD")
}
if password == "" {
Log.Println("Communication between peers is unencrypted.")
} else {
config.Password = []byte(password)
Log.Println("Communication between peers via untrusted networks is encrypted.")
}
if routerName == "" {
if iface == nil {
Log.Fatal("Either an interface must be specified with --iface or a name with -name")
}
routerName = iface.HardwareAddr.String()
}
name, err := mesh.PeerNameFromUserInput(routerName)
checkFatal(err)
if nickName == "" {
nickName, err = os.Hostname()
checkFatal(err)
}
if prof != "" {
p := *profile.CPUProfile
p.ProfilePath = prof
p.NoShutdownHook = true
defer profile.Start(&p).Stop()
}
config.PeerDiscovery = !noDiscovery
if pktdebug {
networkConfig.PacketLogging = packetLogging{}
} else {
networkConfig.PacketLogging = nopPacketLogging{}
}
if config.TrustedSubnets, err = parseTrustedSubnets(trustedSubnetStr); err != nil {
Log.Fatal("Unable to parse trusted subnets: ", err)
}
router := weave.NewNetworkRouter(config, networkConfig, name, nickName, overlays)
Log.Println("Our name is", router.Ourself)
var dockerCli *docker.Client
if dockerAPI != "" {
dc, err := docker.NewClient(dockerAPI)
if err != nil {
Log.Fatal("Unable to start docker client: ", err)
} else {
Log.Info(dc.Info())
}
dockerCli = dc
}
observeContainers := func(o docker.ContainerObserver) {
if dockerCli != nil {
if err = dockerCli.AddObserver(o); err != nil {
Log.Fatal("Unable to start watcher", err)
}
}
}
isKnownPeer := func(name mesh.PeerName) bool {
return router.Peers.Fetch(name) != nil
}
var allocator *ipam.Allocator
var defaultSubnet address.CIDR
if iprangeCIDR != "" {
allocator, defaultSubnet = createAllocator(router.Router, iprangeCIDR, ipsubnetCIDR, determineQuorum(peerCount, peers), isKnownPeer)
observeContainers(allocator)
} else if peerCount > 0 {
Log.Fatal("--init-peer-count flag specified without --ipalloc-range")
}
var (
ns *nameserver.Nameserver
dnsserver *nameserver.DNSServer
)
if !noDNS {
ns = nameserver.New(router.Ourself.Peer.Name, dnsDomain, isKnownPeer)
router.Peers.OnGC(func(peer *mesh.Peer) { ns.PeerGone(peer.Name) })
ns.SetGossip(router.NewGossip("nameserver", ns))
observeContainers(ns)
ns.Start()
defer ns.Stop()
dnsserver, err = nameserver.NewDNSServer(ns, dnsDomain, dnsListenAddress,
dnsEffectiveListenAddress, uint32(dnsTTL), dnsClientTimeout)
if err != nil {
Log.Fatal("Unable to start dns server: ", err)
}
listenAddr := dnsListenAddress
if dnsEffectiveListenAddress != "" {
listenAddr = dnsEffectiveListenAddress
}
Log.Println("Listening for DNS queries on", listenAddr)
dnsserver.ActivateAndServe()
defer dnsserver.Stop()
}
router.Start()
if errors := router.ConnectionMaker.InitiateConnections(peers, false); len(errors) > 0 {
Log.Fatal(ErrorMessages(errors))
}
// The weave script always waits for a status call to succeed,
// so there is no point in doing "weave launch --http-addr ''".
// This is here to support stand-alone use of weaver.
if httpAddr != "" {
muxRouter := mux.NewRouter()
if allocator != nil {
allocator.HandleHTTP(muxRouter, defaultSubnet, dockerCli)
}
if ns != nil {
ns.HandleHTTP(muxRouter, dockerCli)
}
router.HandleHTTP(muxRouter)
HandleHTTP(muxRouter, version, router, allocator, defaultSubnet, ns, dnsserver)
http.Handle("/", muxRouter)
Log.Println("Listening for HTTP control messages on", httpAddr)
go listenAndServeHTTP(httpAddr, muxRouter)
}
SignalHandlerLoop(router)
}
func main() {
var (
justVersion bool
ifaceName string
apiPath string
domain string
dnsPort int
httpPort int
wait int
timeout int
udpbuf int
cacheLen int
watch bool
debug bool
err error
)
flag.BoolVar(&justVersion, "version", false, "print version and exit")
flag.StringVar(&ifaceName, "iface", "", "name of interface to use for multicast")
flag.StringVar(&apiPath, "api", "unix:///var/run/docker.sock", "path to Docker API socket")
flag.StringVar(&domain, "domain", weavedns.DefaultLocalDomain, "local domain (ie, 'weave.local.')")
flag.IntVar(&wait, "wait", 0, "number of seconds to wait for interface to be created and come up")
flag.IntVar(&dnsPort, "dnsport", weavedns.DefaultServerPort, "port to listen to DNS requests")
flag.IntVar(&httpPort, "httpport", 6785, "port to listen to HTTP requests")
flag.IntVar(&timeout, "timeout", weavedns.DefaultTimeout, "timeout for resolutions")
flag.IntVar(&udpbuf, "udpbuf", weavedns.DefaultUDPBuflen, "UDP buffer length")
flag.IntVar(&cacheLen, "cache", weavedns.DefaultCacheLen, "cache length")
flag.BoolVar(&watch, "watch", true, "watch the docker socket for container events")
flag.BoolVar(&debug, "debug", false, "output debugging info to stderr")
flag.Parse()
if justVersion {
fmt.Printf("weave DNS %s\n", version)
os.Exit(0)
}
InitDefaultLogging(debug)
Info.Printf("WeaveDNS version %s\n", version) // first thing in log: the version
var zone = weavedns.NewZoneDb(domain)
if watch {
err := updater.Start(apiPath, zone)
if err != nil {
Error.Fatal("Unable to start watcher", err)
}
}
var iface *net.Interface
if ifaceName != "" {
var err error
Info.Println("Waiting for interface", ifaceName, "to come up")
iface, err = weavenet.EnsureInterface(ifaceName, wait)
if err != nil {
Error.Fatal(err)
} else {
Info.Println("Interface", ifaceName, "is up")
}
}
srvConfig := weavedns.DNSServerConfig{
Port: dnsPort,
CacheLen: cacheLen,
LocalDomain: domain,
Timeout: timeout,
UDPBufLen: udpbuf,
}
srv, err := weavedns.NewDNSServer(srvConfig, zone, iface)
if err != nil {
Error.Fatal("Failed to initialize the WeaveDNS server", err)
}
Info.Println("Upstream", srv.Upstream)
go SignalHandlerLoop(srv)
go weavedns.ListenHTTP(version, srv, domain, zone, httpPort)
err = srv.Start()
if err != nil {
Error.Fatal("[main] Failed to start the WeaveDNS server: ", err)
}
}