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@ -16,7 +16,7 @@ import (
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var version string
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func parseBindAddr(bindAddrs []string) ([]net.Addr, error) {
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func resolveBindAddr(bindAddrs []string) ([]net.Addr, error) {
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var addrs []net.Addr
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for _, addr := range bindAddrs {
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bindAddr, err := net.ResolveTCPAddr("tcp", addr)
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@ -28,6 +28,45 @@ func parseBindAddr(bindAddrs []string) ([]net.Addr, error) {
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return addrs, nil
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}
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// parse what shadowsocks server wants us to bind and harmonise it with what's already in bindAddr from
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// our own config's BindAddr. This prevents duplicate bindings etc.
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func parseSSBindAddr(ssRemoteHost string, ssRemotePort string, ckBindAddr *[]net.Addr) error {
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var ssBind string
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// When listening on an IPv6 and IPv4, SS gives REMOTE_HOST as e.g. ::|0.0.0.0
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v4nv6 := len(strings.Split(ssRemoteHost, "|")) == 2
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if v4nv6 {
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ssBind = ":" + ssRemotePort
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} else {
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ssBind = net.JoinHostPort(ssRemoteHost, ssRemotePort)
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}
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ssBindAddr, err := net.ResolveTCPAddr("tcp", ssBind)
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if err != nil {
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return fmt.Errorf("unable to resolve bind address provided by SS: %v", err)
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}
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shouldAppend := true
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for i, addr := range *ckBindAddr {
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if addr.String() == ssBindAddr.String() {
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shouldAppend = false
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}
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if addr.String() == ":"+ssRemotePort { // already listening on all interfaces
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shouldAppend = false
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}
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if addr.String() == "0.0.0.0:"+ssRemotePort || addr.String() == "[::]:"+ssRemotePort {
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// if config listens on one ip version but ss wants to listen on both,
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// listen on both
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if ssBindAddr.String() == ":"+ssRemotePort {
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shouldAppend = true
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(*ckBindAddr)[i] = ssBindAddr
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}
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}
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}
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if shouldAppend {
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*ckBindAddr = append(*ckBindAddr, ssBindAddr)
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}
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return nil
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}
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func main() {
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var config string
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@ -90,17 +129,20 @@ func main() {
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log.Fatalf("Configuration file error: %v", err)
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}
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bindAddr, err := parseBindAddr(raw.BindAddr)
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bindAddr, err := resolveBindAddr(raw.BindAddr)
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if err != nil {
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log.Fatalf("unable to parse BindAddr: %v", err)
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}
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// in case the user hasn't specified any local address to bind to, we listen on 443 and 80
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if !pluginMode && len(bindAddr) == 0 {
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https, _ := net.ResolveTCPAddr("tcp", ":443")
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http, _ := net.ResolveTCPAddr("tcp", ":80")
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bindAddr = []net.Addr{https, http}
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}
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// when cloak is started as a shadowsocks plugin
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// when cloak is started as a shadowsocks plugin, we parse the address ss-server
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// is listening on into ProxyBook, and we parse the list of bindAddr
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if pluginMode {
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ssLocalHost := os.Getenv("SS_LOCAL_HOST")
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ssLocalPort := os.Getenv("SS_LOCAL_PORT")
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@ -108,38 +150,9 @@ func main() {
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ssRemoteHost := os.Getenv("SS_REMOTE_HOST")
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ssRemotePort := os.Getenv("SS_REMOTE_PORT")
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var ssBind string
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// When listening on an IPv6 and IPv4, SS gives REMOTE_HOST as e.g. ::|0.0.0.0
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v4nv6 := len(strings.Split(ssRemoteHost, "|")) == 2
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if v4nv6 {
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ssBind = ":" + ssRemotePort
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} else {
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ssBind = net.JoinHostPort(ssRemoteHost, ssRemotePort)
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}
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ssBindAddr, err := net.ResolveTCPAddr("tcp", ssBind)
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err = parseSSBindAddr(ssRemoteHost, ssRemotePort, &bindAddr)
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if err != nil {
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log.Fatalf("unable to resolve bind address provided by SS: %v", err)
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}
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shouldAppend := true
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for i, addr := range bindAddr {
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if addr.String() == ssBindAddr.String() {
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shouldAppend = false
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}
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if addr.String() == ":"+ssRemotePort { // already listening on all interfaces
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shouldAppend = false
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}
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if addr.String() == "0.0.0.0:"+ssRemotePort || addr.String() == "[::]:"+ssRemotePort {
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// if config listens on one ip version but ss wants to listen on both,
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// listen on both
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if ssBindAddr.String() == ":"+ssRemotePort {
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shouldAppend = true
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bindAddr[i] = ssBindAddr
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}
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}
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}
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if shouldAppend {
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bindAddr = append(bindAddr, ssBindAddr)
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log.Fatalf("failed to parse SS_REMOTE_HOST and SS_REMOTE_PORT: %v", err)
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}
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}
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@ -161,6 +174,7 @@ func main() {
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if i != len(bindAddr)-1 {
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go listen(addr)
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} else {
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// we block the main goroutine here so it doesn't quit
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listen(addr)
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}
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}
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