GH-352: Add Tunnel CLI option "edge-bind-address" (#870)
* Add Tunnel CLI option "edge-bind-address"
This commit is contained in:
parent
b97979487e
commit
fed60ae4c3
cmd/cloudflared/tunnel
connection
edgediscovery
supervisor
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@ -551,11 +551,17 @@ func tunnelFlags(shouldHide bool) []cli.Flag {
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}),
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}),
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altsrc.NewStringFlag(&cli.StringFlag{
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altsrc.NewStringFlag(&cli.StringFlag{
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Name: "edge-ip-version",
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Name: "edge-ip-version",
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Usage: "Cloudflare Edge ip address version to connect with. {4, 6, auto}",
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Usage: "Cloudflare Edge IP address version to connect with. {4, 6, auto}",
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EnvVars: []string{"TUNNEL_EDGE_IP_VERSION"},
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EnvVars: []string{"TUNNEL_EDGE_IP_VERSION"},
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Value: "4",
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Value: "4",
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Hidden: false,
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Hidden: false,
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}),
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}),
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altsrc.NewStringFlag(&cli.StringFlag{
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Name: "edge-bind-address",
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Usage: "Bind to IP address for outgoing connections to Cloudflare Edge.",
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EnvVars: []string{"TUNNEL_EDGE_BIND_ADDRESS"},
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Hidden: false,
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}),
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altsrc.NewStringFlag(&cli.StringFlag{
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altsrc.NewStringFlag(&cli.StringFlag{
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Name: tlsconfig.CaCertFlag,
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Name: tlsconfig.CaCertFlag,
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Usage: "Certificate Authority authenticating connections with Cloudflare's edge network.",
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Usage: "Certificate Authority authenticating connections with Cloudflare's edge network.",
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@ -44,7 +44,7 @@ var (
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secretFlags = [2]*altsrc.StringFlag{credentialsContentsFlag, tunnelTokenFlag}
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secretFlags = [2]*altsrc.StringFlag{credentialsContentsFlag, tunnelTokenFlag}
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defaultFeatures = []string{supervisor.FeatureAllowRemoteConfig, supervisor.FeatureSerializedHeaders, supervisor.FeatureDatagramV2, supervisor.FeatureQUICSupportEOF}
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defaultFeatures = []string{supervisor.FeatureAllowRemoteConfig, supervisor.FeatureSerializedHeaders, supervisor.FeatureDatagramV2, supervisor.FeatureQUICSupportEOF}
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configFlags = []string{"autoupdate-freq", "no-autoupdate", "retries", "protocol", "loglevel", "transport-loglevel", "origincert", "metrics", "metrics-update-freq", "edge-ip-version"}
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configFlags = []string{"autoupdate-freq", "no-autoupdate", "retries", "protocol", "loglevel", "transport-loglevel", "origincert", "metrics", "metrics-update-freq", "edge-ip-version", "edge-bind-address"}
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)
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)
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// returns the first path that contains a cert.pem file. If none of the DefaultConfigSearchDirectories
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// returns the first path that contains a cert.pem file. If none of the DefaultConfigSearchDirectories
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@ -284,6 +284,18 @@ func prepareTunnelConfig(
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if err != nil {
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if err != nil {
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return nil, nil, err
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return nil, nil, err
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}
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}
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edgeBindAddr, err := parseConfigBindAddress(c.String("edge-bind-address"))
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if err != nil {
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return nil, nil, err
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}
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if err := testIPBindable(edgeBindAddr); err != nil {
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return nil, nil, fmt.Errorf("invalid edge-bind-address %s: %v", edgeBindAddr, err)
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}
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edgeIPVersion, err = adjustIPVersionByBindAddress(edgeIPVersion, edgeBindAddr)
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if err != nil {
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// This is not a fatal error, we just overrode edgeIPVersion
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log.Warn().Str("edgeIPVersion", edgeIPVersion.String()).Err(err).Msg("Overriding edge-ip-version")
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}
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var pqKexIdx int
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var pqKexIdx int
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if needPQ {
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if needPQ {
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@ -302,6 +314,7 @@ func prepareTunnelConfig(
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EdgeAddrs: c.StringSlice("edge"),
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EdgeAddrs: c.StringSlice("edge"),
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Region: c.String("region"),
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Region: c.String("region"),
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EdgeIPVersion: edgeIPVersion,
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EdgeIPVersion: edgeIPVersion,
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EdgeBindAddr: edgeBindAddr,
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HAConnections: c.Int("ha-connections"),
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HAConnections: c.Int("ha-connections"),
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IncidentLookup: supervisor.NewIncidentLookup(),
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IncidentLookup: supervisor.NewIncidentLookup(),
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IsAutoupdated: c.Bool("is-autoupdated"),
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IsAutoupdated: c.Bool("is-autoupdated"),
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@ -394,6 +407,51 @@ func parseConfigIPVersion(version string) (v allregions.ConfigIPVersion, err err
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return
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return
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}
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}
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func parseConfigBindAddress(ipstr string) (net.IP, error) {
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// Unspecified - it's fine
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if ipstr == "" {
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return nil, nil
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}
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ip := net.ParseIP(ipstr)
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if ip == nil {
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return nil, fmt.Errorf("invalid value for edge-bind-address: %s", ipstr)
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}
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return ip, nil
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}
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func testIPBindable(ip net.IP) error {
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// "Unspecified" = let OS choose, so always bindable
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if ip == nil {
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return nil
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}
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addr := &net.UDPAddr{IP: ip, Port: 0}
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listener, err := net.ListenUDP("udp", addr)
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if err != nil {
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return err
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}
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listener.Close()
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return nil
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}
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func adjustIPVersionByBindAddress(ipVersion allregions.ConfigIPVersion, ip net.IP) (allregions.ConfigIPVersion, error) {
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if ip == nil {
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return ipVersion, nil
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}
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// https://pkg.go.dev/net#IP.To4: "If ip is not an IPv4 address, To4 returns nil."
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if ip.To4() != nil {
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if ipVersion == allregions.IPv6Only {
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return allregions.IPv4Only, fmt.Errorf("IPv4 bind address is specified, but edge-ip-version is IPv6")
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}
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return allregions.IPv4Only, nil
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} else {
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if ipVersion == allregions.IPv4Only {
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return allregions.IPv6Only, fmt.Errorf("IPv6 bind address is specified, but edge-ip-version is IPv4")
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}
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return allregions.IPv6Only, nil
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}
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}
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func newPacketConfig(c *cli.Context, logger *zerolog.Logger) (*ingress.GlobalRouterConfig, error) {
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func newPacketConfig(c *cli.Context, logger *zerolog.Logger) (*ingress.GlobalRouterConfig, error) {
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ipv4Src, err := determineICMPv4Src(c.String("icmpv4-src"), logger)
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ipv4Src, err := determineICMPv4Src(c.String("icmpv4-src"), logger)
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if err != nil {
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if err != nil {
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@ -9,6 +9,7 @@ import (
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"crypto/x509"
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"crypto/x509"
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"crypto/x509/pkix"
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"crypto/x509/pkix"
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"encoding/asn1"
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"encoding/asn1"
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"net"
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"os"
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"os"
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"testing"
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"testing"
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@ -214,3 +215,23 @@ func getCertPoolSubjects(certPool *x509.CertPool) ([]*pkix.Name, error) {
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func isUnrecoverableError(err error) bool {
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func isUnrecoverableError(err error) bool {
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return err != nil && err.Error() != "crypto/x509: system root pool is not available on Windows"
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return err != nil && err.Error() != "crypto/x509: system root pool is not available on Windows"
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}
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}
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func TestTestIPBindable(t *testing.T) {
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assert.Nil(t, testIPBindable(nil))
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// Public services - if one of these IPs is on the machine, the test environment is too weird
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assert.NotNil(t, testIPBindable(net.ParseIP("8.8.8.8")))
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assert.NotNil(t, testIPBindable(net.ParseIP("1.1.1.1")))
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addrs, err := net.InterfaceAddrs()
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if err != nil {
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t.Fatal(err)
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}
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for i, addr := range addrs {
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if i >= 3 {
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break
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}
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ip := addr.(*net.IPNet).IP
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assert.Nil(t, testIPBindable(ip))
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}
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}
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@ -67,6 +67,7 @@ type QUICConnection struct {
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func NewQUICConnection(
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func NewQUICConnection(
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quicConfig *quic.Config,
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quicConfig *quic.Config,
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edgeAddr net.Addr,
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edgeAddr net.Addr,
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localAddr net.IP,
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connIndex uint8,
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connIndex uint8,
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tlsConfig *tls.Config,
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tlsConfig *tls.Config,
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orchestrator Orchestrator,
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orchestrator Orchestrator,
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@ -75,7 +76,7 @@ func NewQUICConnection(
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logger *zerolog.Logger,
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logger *zerolog.Logger,
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packetRouterConfig *ingress.GlobalRouterConfig,
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packetRouterConfig *ingress.GlobalRouterConfig,
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) (*QUICConnection, error) {
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) (*QUICConnection, error) {
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udpConn, err := createUDPConnForConnIndex(connIndex, logger)
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udpConn, err := createUDPConnForConnIndex(connIndex, localAddr, logger)
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if err != nil {
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if err != nil {
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return nil, err
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return nil, err
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}
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}
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@ -563,13 +564,17 @@ func (rp *muxerWrapper) Close() error {
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return nil
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return nil
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}
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}
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func createUDPConnForConnIndex(connIndex uint8, logger *zerolog.Logger) (*net.UDPConn, error) {
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func createUDPConnForConnIndex(connIndex uint8, localIP net.IP, logger *zerolog.Logger) (*net.UDPConn, error) {
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portMapMutex.Lock()
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portMapMutex.Lock()
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defer portMapMutex.Unlock()
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defer portMapMutex.Unlock()
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if localIP == nil {
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localIP = net.IPv4zero
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}
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// if port was not set yet, it will be zero, so bind will randomly allocate one.
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// if port was not set yet, it will be zero, so bind will randomly allocate one.
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if port, ok := portForConnIndex[connIndex]; ok {
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if port, ok := portForConnIndex[connIndex]; ok {
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: port})
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: localIP, Port: port})
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// if there wasn't an error, or if port was 0 (independently of error or not, just return)
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// if there wasn't an error, or if port was 0 (independently of error or not, just return)
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if err == nil {
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if err == nil {
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return udpConn, nil
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return udpConn, nil
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@ -579,7 +584,7 @@ func createUDPConnForConnIndex(connIndex uint8, logger *zerolog.Logger) (*net.UD
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}
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}
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// if we reached here, then there was an error or port as not been allocated it.
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// if we reached here, then there was an error or port as not been allocated it.
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: localIP, Port: 0})
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if err == nil {
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if err == nil {
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udpAddr, ok := (udpConn.LocalAddr()).(*net.UDPAddr)
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udpAddr, ok := (udpConn.LocalAddr()).(*net.UDPAddr)
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if !ok {
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if !ok {
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@ -572,7 +572,7 @@ func TestNopCloserReadWriterCloseAfterEOF(t *testing.T) {
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func TestCreateUDPConnReuseSourcePort(t *testing.T) {
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func TestCreateUDPConnReuseSourcePort(t *testing.T) {
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logger := zerolog.Nop()
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logger := zerolog.Nop()
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conn, err := createUDPConnForConnIndex(0, &logger)
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conn, err := createUDPConnForConnIndex(0, nil, &logger)
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require.NoError(t, err)
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require.NoError(t, err)
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getPortFunc := func(conn *net.UDPConn) int {
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getPortFunc := func(conn *net.UDPConn) int {
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@ -586,17 +586,17 @@ func TestCreateUDPConnReuseSourcePort(t *testing.T) {
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conn.Close()
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conn.Close()
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// should get the same port as before.
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// should get the same port as before.
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conn, err = createUDPConnForConnIndex(0, &logger)
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conn, err = createUDPConnForConnIndex(0, nil, &logger)
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require.NoError(t, err)
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require.NoError(t, err)
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require.Equal(t, initialPort, getPortFunc(conn))
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require.Equal(t, initialPort, getPortFunc(conn))
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// new index, should get a different port
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// new index, should get a different port
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conn1, err := createUDPConnForConnIndex(1, &logger)
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conn1, err := createUDPConnForConnIndex(1, nil, &logger)
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require.NoError(t, err)
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require.NoError(t, err)
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require.NotEqual(t, initialPort, getPortFunc(conn1))
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require.NotEqual(t, initialPort, getPortFunc(conn1))
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// not closing the conn and trying to obtain a new conn for same index should give a different random port
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// not closing the conn and trying to obtain a new conn for same index should give a different random port
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conn, err = createUDPConnForConnIndex(0, &logger)
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conn, err = createUDPConnForConnIndex(0, nil, &logger)
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require.NoError(t, err)
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require.NoError(t, err)
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require.NotEqual(t, initialPort, getPortFunc(conn))
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require.NotEqual(t, initialPort, getPortFunc(conn))
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}
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}
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@ -716,6 +716,7 @@ func testQUICConnection(udpListenerAddr net.Addr, t *testing.T, index uint8) *QU
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qc, err := NewQUICConnection(
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qc, err := NewQUICConnection(
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testQUICConfig,
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testQUICConfig,
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udpListenerAddr,
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udpListenerAddr,
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nil,
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index,
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index,
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tlsClientConfig,
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tlsClientConfig,
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&mockOrchestrator{originProxy: &mockOriginProxyWithRequest{}},
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&mockOrchestrator{originProxy: &mockOriginProxyWithRequest{}},
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@ -41,6 +41,19 @@ const (
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IPv6Only ConfigIPVersion = 6
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IPv6Only ConfigIPVersion = 6
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)
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)
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func (c ConfigIPVersion) String() string {
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switch c {
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case Auto:
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return "auto"
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case IPv4Only:
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return "4"
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case IPv6Only:
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return "6"
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default:
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return ""
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}
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}
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// IPVersion is the IP version of an EdgeAddr
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// IPVersion is the IP version of an EdgeAddr
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type EdgeIPVersion int8
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type EdgeIPVersion int8
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@ -15,12 +15,16 @@ func DialEdge(
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timeout time.Duration,
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timeout time.Duration,
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tlsConfig *tls.Config,
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tlsConfig *tls.Config,
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edgeTCPAddr *net.TCPAddr,
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edgeTCPAddr *net.TCPAddr,
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localIP net.IP,
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) (net.Conn, error) {
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) (net.Conn, error) {
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// Inherit from parent context so we can cancel (Ctrl-C) while dialing
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// Inherit from parent context so we can cancel (Ctrl-C) while dialing
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dialCtx, dialCancel := context.WithTimeout(ctx, timeout)
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dialCtx, dialCancel := context.WithTimeout(ctx, timeout)
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defer dialCancel()
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defer dialCancel()
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dialer := net.Dialer{}
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dialer := net.Dialer{}
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if localIP != nil {
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dialer.LocalAddr = &net.TCPAddr{IP: localIP, Port: 0}
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}
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edgeConn, err := dialer.DialContext(dialCtx, "tcp", edgeTCPAddr.String())
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edgeConn, err := dialer.DialContext(dialCtx, "tcp", edgeTCPAddr.String())
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if err != nil {
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if err != nil {
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return nil, newDialError(err, "DialContext error")
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return nil, newDialError(err, "DialContext error")
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@ -82,6 +82,7 @@ func NewSupervisor(config *TunnelConfig, orchestrator *orchestration.Orchestrato
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log := NewConnAwareLogger(config.Log, tracker, config.Observer)
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log := NewConnAwareLogger(config.Log, tracker, config.Observer)
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edgeAddrHandler := NewIPAddrFallback(config.MaxEdgeAddrRetries)
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edgeAddrHandler := NewIPAddrFallback(config.MaxEdgeAddrRetries)
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edgeBindAddr := config.EdgeBindAddr
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edgeTunnelServer := EdgeTunnelServer{
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edgeTunnelServer := EdgeTunnelServer{
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config: config,
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config: config,
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@ -89,6 +90,7 @@ func NewSupervisor(config *TunnelConfig, orchestrator *orchestration.Orchestrato
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credentialManager: reconnectCredentialManager,
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credentialManager: reconnectCredentialManager,
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edgeAddrs: edgeIPs,
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edgeAddrs: edgeIPs,
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edgeAddrHandler: edgeAddrHandler,
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edgeAddrHandler: edgeAddrHandler,
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edgeBindAddr: edgeBindAddr,
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tracker: tracker,
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tracker: tracker,
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reconnectCh: reconnectCh,
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reconnectCh: reconnectCh,
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gracefulShutdownC: gracefulShutdownC,
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gracefulShutdownC: gracefulShutdownC,
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@ -49,6 +49,7 @@ type TunnelConfig struct {
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EdgeAddrs []string
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EdgeAddrs []string
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Region string
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Region string
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EdgeIPVersion allregions.ConfigIPVersion
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EdgeIPVersion allregions.ConfigIPVersion
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EdgeBindAddr net.IP
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HAConnections int
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HAConnections int
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IncidentLookup IncidentLookup
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IncidentLookup IncidentLookup
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IsAutoupdated bool
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IsAutoupdated bool
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@ -207,6 +208,7 @@ type EdgeTunnelServer struct {
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credentialManager *reconnectCredentialManager
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credentialManager *reconnectCredentialManager
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edgeAddrHandler EdgeAddrHandler
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edgeAddrHandler EdgeAddrHandler
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edgeAddrs *edgediscovery.Edge
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edgeAddrs *edgediscovery.Edge
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edgeBindAddr net.IP
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reconnectCh chan ReconnectSignal
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reconnectCh chan ReconnectSignal
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gracefulShutdownC <-chan struct{}
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gracefulShutdownC <-chan struct{}
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||||||
tracker *tunnelstate.ConnTracker
|
tracker *tunnelstate.ConnTracker
|
||||||
|
@ -497,7 +499,7 @@ func (e *EdgeTunnelServer) serveConnection(
|
||||||
connIndex)
|
connIndex)
|
||||||
|
|
||||||
case connection.HTTP2:
|
case connection.HTTP2:
|
||||||
edgeConn, err := edgediscovery.DialEdge(ctx, dialTimeout, e.config.EdgeTLSConfigs[protocol], addr.TCP)
|
edgeConn, err := edgediscovery.DialEdge(ctx, dialTimeout, e.config.EdgeTLSConfigs[protocol], addr.TCP, e.edgeBindAddr)
|
||||||
if err != nil {
|
if err != nil {
|
||||||
connLog.ConnAwareLogger().Err(err).Msg("Unable to establish connection with Cloudflare edge")
|
connLog.ConnAwareLogger().Err(err).Msg("Unable to establish connection with Cloudflare edge")
|
||||||
return err, true
|
return err, true
|
||||||
|
@ -516,7 +518,7 @@ func (e *EdgeTunnelServer) serveConnection(
|
||||||
}
|
}
|
||||||
|
|
||||||
default:
|
default:
|
||||||
edgeConn, err := edgediscovery.DialEdge(ctx, dialTimeout, e.config.EdgeTLSConfigs[protocol], addr.TCP)
|
edgeConn, err := edgediscovery.DialEdge(ctx, dialTimeout, e.config.EdgeTLSConfigs[protocol], addr.TCP, e.edgeBindAddr)
|
||||||
if err != nil {
|
if err != nil {
|
||||||
connLog.ConnAwareLogger().Err(err).Msg("Unable to establish connection with Cloudflare edge")
|
connLog.ConnAwareLogger().Err(err).Msg("Unable to establish connection with Cloudflare edge")
|
||||||
return err, true
|
return err, true
|
||||||
|
@ -672,6 +674,7 @@ func (e *EdgeTunnelServer) serveQUIC(
|
||||||
quicConn, err := connection.NewQUICConnection(
|
quicConn, err := connection.NewQUICConnection(
|
||||||
quicConfig,
|
quicConfig,
|
||||||
edgeAddr,
|
edgeAddr,
|
||||||
|
e.edgeBindAddr,
|
||||||
connIndex,
|
connIndex,
|
||||||
tlsConfig,
|
tlsConfig,
|
||||||
e.orchestrator,
|
e.orchestrator,
|
||||||
|
|
Loading…
Reference in New Issue