// Resolve an address string into a net.TCPAddr. We are a bit more strict than
// net.ResolveTCPAddr; we don't allow an empty host or port, and the host part
// must be a literal IP address.
func resolveAddr(addrStr string) (*net.TCPAddr, error) {
ipStr, portStr, err := net.SplitHostPort(addrStr)
if err != nil {
// Before the fixing of bug #7011, tor doesn't put brackets around IPv6
// addresses. Split after the last colon, assuming it is a port
// separator, and try adding the brackets.
parts := strings.Split(addrStr, ":")
if len(parts) <= 2 {
return nil, err
}
addrStr := "[" + strings.Join(parts[:len(parts)-1], ":") + "]:" + parts[len(parts)-1]
ipStr, portStr, err = net.SplitHostPort(addrStr)
}
if err != nil {
return nil, err
}
if ipStr == "" {
return nil, net.InvalidAddrError(fmt.Sprintf("address string %q lacks a host part", addrStr))
}
if portStr == "" {
return nil, net.InvalidAddrError(fmt.Sprintf("address string %q lacks a port part", addrStr))
}
ip := net.ParseIP(ipStr)
if ip == nil {
return nil, net.InvalidAddrError(fmt.Sprintf("not an IP string: %q", ipStr))
}
port, err := parsePort(portStr)
if err != nil {
return nil, err
}
return &net.TCPAddr{IP: ip, Port: port}, nil
}
func (d *Dailer) Dial(network, address string) (net.Conn, error) {
switch network {
case "tcp", "tcp4", "tcp6":
if d.DNSCache != nil {
if addr, ok := d.DNSCache.Get(address); ok {
address = addr.(string)
} else {
if host, port, err := net.SplitHostPort(address); err == nil {
if ips, err := net.LookupIP(host); err == nil && len(ips) > 0 {
ip := ips[0].String()
if _, ok := d.LoopbackAddrs[ip]; ok {
return nil, net.InvalidAddrError(fmt.Sprintf("Invaid DNS Record: %s(%s)", host, ip))
}
addr := net.JoinHostPort(ip, port)
d.DNSCache.Set(address, addr, time.Now().Add(d.DNSCacheExpires))
glog.V(3).Infof("direct Dial cache dns %#v=%#v", address, addr)
address = addr
}
}
}
}
default:
break
}
return d.Dialer.Dial(network, address)
}
func (i *IP2ASNClient) parseIP(IP string) (net.IP, error) {
I := net.ParseIP(IP)
if I == nil {
return nil, net.InvalidAddrError(IP)
}
return I, nil
}
// ParseControlPortString parses a string representation of a control port
// address into a network/address string pair suitable for use with "dial".
//
// Valid string representations are:
// * tcp://address:port
// * unix://path
// * port (Translates to tcp://127.0.0.1:port)
func ParseControlPortString(raw string) (network, addr string, err error) {
// Try parsing it as a naked port.
if _, err = strconv.ParseUint(raw, 10, 16); err == nil {
raw = "tcp://127.0.0.1:" + raw
}
// Ok, parse/validate the URI.
uri, err := url.Parse(raw)
if err != nil {
return "", "", err
}
if uri.Opaque != "" || uri.RawQuery != "" || uri.Fragment != "" {
return "", "", net.InvalidAddrError("uri has Opaque/Query/Fragment")
}
switch uri.Scheme {
case "tcp":
if uri.Path != "" {
return "", "", net.InvalidAddrError("tcp uri has a path")
}
tcpAddr, err := net.ResolveTCPAddr(uri.Scheme, uri.Host)
if err != nil {
return "", "", err
}
if tcpAddr.Port == 0 {
return "", "", net.InvalidAddrError("tcp uri is missing a port")
}
return uri.Scheme, uri.Host, nil
case "unix":
if uri.Host != "" {
return "", "", net.InvalidAddrError("unix uri has a host")
}
_, err := net.ResolveUnixAddr(uri.Scheme, uri.Path)
if err != nil {
return "", "", err
}
return uri.Scheme, uri.Path, nil
}
return "", "", net.InvalidAddrError("unknown scheme: " + uri.Scheme)
}
func ipToSocksAddr(family int, ip net.IP, port int, zone string) (unix.Sockaddr, error) {
switch family {
case unix.AF_INET:
if len(ip) == 0 {
ip = net.IPv4zero
}
if ip = ip.To4(); ip == nil {
return nil, net.InvalidAddrError("non-IPv4 address")
}
sa := new(unix.SockaddrInet4)
for i := 0; i < net.IPv4len; i++ {
sa.Addr[i] = ip[i]
}
sa.Port = port
return sa, nil
case unix.AF_INET6:
if len(ip) == 0 {
ip = net.IPv6zero
}
// IPv4 callers use 0.0.0.0 to mean "announce on any available address".
// In IPv6 mode, Linux treats that as meaning "announce on 0.0.0.0",
// which it refuses to do. Rewrite to the IPv6 unspecified address.
if ip.Equal(net.IPv4zero) {
ip = net.IPv6zero
}
if ip = ip.To16(); ip == nil {
return nil, net.InvalidAddrError("non-IPv6 address")
}
sa := new(unix.SockaddrInet6)
for i := 0; i < net.IPv6len; i++ {
sa.Addr[i] = ip[i]
}
sa.Port = port
sa.ZoneId = uint32(zoneToInt(zone))
return sa, nil
}
return nil, net.InvalidAddrError("unexpected socket family")
}
// Sigh, pt.resolveAddr() isn't exported. Include our own getto version that
// doesn't work around #7011, because we don't work with pre-0.2.5.x tor, and
// all we care about is validation anyway.
func resolveAddrStr(addrStr string) (*net.TCPAddr, error) {
ipStr, portStr, err := net.SplitHostPort(addrStr)
if err != nil {
return nil, err
}
if ipStr == "" {
return nil, net.InvalidAddrError(fmt.Sprintf("address string %q lacks a host part", addrStr))
}
if portStr == "" {
return nil, net.InvalidAddrError(fmt.Sprintf("address string %q lacks a port part", addrStr))
}
ip := net.ParseIP(ipStr)
if ip == nil {
return nil, net.InvalidAddrError(fmt.Sprintf("not an IP string: %q", ipStr))
}
port, err := strconv.ParseUint(portStr, 10, 16)
if err != nil {
return nil, net.InvalidAddrError(fmt.Sprintf("not a Port string: %q", portStr))
}
return &net.TCPAddr{IP: ip, Port: int(port), Zone: ""}, nil
}
func sockaddr(family int, address string) (syscall.Sockaddr, error) {
switch family {
case syscall.AF_INET:
a, err := net.ResolveIPAddr("ip4", address)
if err != nil {
return nil, err
}
if len(a.IP) == 0 {
a.IP = net.IPv4zero
}
if a.IP = a.IP.To4(); a.IP == nil {
return nil, net.InvalidAddrError("non-ipv4 address")
}
sa := &syscall.SockaddrInet4{}
copy(sa.Addr[:], a.IP)
return sa, nil
case syscall.AF_INET6:
a, err := net.ResolveIPAddr("ip6", address)
if err != nil {
return nil, err
}
if len(a.IP) == 0 {
a.IP = net.IPv6unspecified
}
if a.IP.Equal(net.IPv4zero) {
a.IP = net.IPv6unspecified
}
if a.IP = a.IP.To16(); a.IP == nil || a.IP.To4() != nil {
return nil, net.InvalidAddrError("non-ipv6 address")
}
sa := &syscall.SockaddrInet6{ZoneId: zoneToUint32(a.Zone)}
copy(sa.Addr[:], a.IP)
return sa, nil
default:
return nil, net.InvalidAddrError("unexpected family")
}
}
func (d *Dialer) Dial(network, address string) (conn net.Conn, err error) {
glog.V(3).Infof("Dail(%#v, %#v)", network, address)
switch network {
case "tcp", "tcp4", "tcp6":
if d.Resolver != nil {
if host, port, err := net.SplitHostPort(address); err == nil {
if ips, err := d.Resolver.LookupIP(host); err == nil {
if len(ips) == 0 {
return nil, net.InvalidAddrError(fmt.Sprintf("Invaid DNS Record: %s", address))
}
return d.dialMulti(network, address, ips, port)
}
}
}
}
return d.Dialer.Dial(network, address)
}
func (s *UTPSocket) Connect(addr *UTPAddr) (int, error) {
// func (s *UTPSocket) Connect(to *syscall.RawSockaddr, tolen int) int {
if addr == nil {
return 0, net.InvalidAddrError("No address given.")
}
sa, err := addr.Sockaddr()
if err != nil {
return 0, err
}
rsa, err := sockaddr.NewRawSockaddr(&sa)
if err != nil {
return 0, err
}
ptr := (*C.struct_sockaddr)(unsafe.Pointer(&rsa.Raw))
ret := int(C.utp_connect(s.raw, ptr, C.socklen_t(rsa.Len)))
return ret, nil
}
func tcpAddrToSockaddr(addr string) (sa unix.Sockaddr, err error) {
if len(addr) > 0 && addr[0] == ':' {
addr = "0.0.0.0" + addr
}
tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return
}
if ip := tcpAddr.IP.To4(); ip != nil {
sa := new(unix.SockaddrInet4)
sa.Port = tcpAddr.Port
copy(sa.Addr[:], ip)
return sa, nil
} else if ip := tcpAddr.IP.To16(); ip != nil {
sa := new(unix.SockaddrInet6)
sa.Port = tcpAddr.Port
copy(sa.Addr[:], ip)
sa.ZoneId = uint32(zoneToInt(tcpAddr.Zone))
return sa, nil
}
return nil, net.InvalidAddrError("unknown address")
}
func (d *Dialer) Dial(network, address string) (conn net.Conn, err error) {
glog.V(3).Infof("Dail(%#v, %#v)", network, address)
switch network {
case "tcp", "tcp4", "tcp6":
if d.DNSCache != nil {
if addr, ok := d.DNSCache.Get(address); ok {
address = addr.(string)
} else {
if host, port, err := net.SplitHostPort(address); err == nil {
if ips, err := net.LookupIP(host); err == nil && len(ips) > 0 {
ip := ips[0].String()
if d.LoopbackAddrs != nil {
if _, ok := d.LoopbackAddrs[ip]; ok {
return nil, net.InvalidAddrError(fmt.Sprintf("Invaid DNS Record: %s(%s)", host, ip))
}
}
addr := net.JoinHostPort(ip, port)
expiry := d.DNSCacheExpiry
if expiry == 0 {
expiry = DefaultDNSCacheExpiry
}
d.DNSCache.Set(address, addr, time.Now().Add(expiry))
glog.V(3).Infof("direct Dial cache dns %#v=%#v", address, addr)
address = addr
}
}
}
}
default:
break
}
if d.Level <= 1 {
retry := d.RetryTimes
if retry == 0 {
retry = DefaultRetryTimes
}
for i := 0; i < retry; i++ {
conn, err = d.Dialer.Dial(network, address)
if err == nil || i == retry-1 {
break
}
retryDelay := d.RetryDelay
if retryDelay == 0 {
retryDelay = DefaultRetryDelay
}
time.Sleep(retryDelay)
}
return conn, err
} else {
type racer struct {
c net.Conn
e error
}
lane := make(chan racer, d.Level)
retry := (d.RetryTimes + d.Level - 1) / d.Level
for i := 0; i < retry; i++ {
for j := 0; j < d.Level; j++ {
go func(addr string, c chan<- racer) {
conn, err := d.Dialer.Dial(network, addr)
lane <- racer{conn, err}
}(address, lane)
}
var r racer
for k := 0; k < d.Level; k++ {
r = <-lane
if r.e == nil {
go func(count int) {
var r1 racer
for ; count > 0; count-- {
r1 = <-lane
if r1.c != nil {
r1.c.Close()
}
}
}(d.Level - 1 - k)
return r.c, nil
}
}
if i == retry-1 {
return nil, r.e
}
}
}
return nil, net.UnknownNetworkError("Unkown transport/direct error")
}