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gost
Commit 822cc6ac authored by rui.zheng's avatar rui.zheng
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Options

update

parent 9884015d
Hide whitespace changes
Inline Side-by-side
Showing with 164 additions and 369 deletions
handler.go 0 → 100644
View file @ 822cc6ac
package gost
import (
"net"
)
type Handler interface {
Handle(net.Conn)
}
type DefaultHandler struct {
server Server
}
func (h *DefaultHandler) Handle(conn net.Conn) {
var handler Handler
switch h.server.Options().BaseOptions().Protocol {
case "http":
case "ss": // shadowsocks
handler = ShadowHandler(h.server)
}
handler.Handle(conn)
}
options.go
View file @ 822cc6ac
......@@ -2,6 +2,7 @@ package gost
import (
"log"
"net/url"
"reflect"
)
......@@ -13,9 +14,10 @@ type Options interface {
type Option func(Options)
type BaseOptions struct {
Addr string `opt:"addr"` // [host]:port
Protocol string `opt:"protocol"` // protocol: http/socks5/ss
Transport string `opt:"transport"` // transport: ws/wss/tls/http2/tcp/udp/rtcp/rudp
Addr string `opt:"addr"` // [host]:port
Protocol string `opt:"protocol"` // protocol: http/socks5/ss
Transport string `opt:"transport"` // transport: ws/wss/tls/http2/tcp/udp/rtcp/rudp
Users []url.Userinfo `opt:"users"` // authentication for proxy
}
func AddrOption(a string) Option {
......@@ -36,6 +38,12 @@ func TransportOption(t string) Option {
}
}
func UsersOption(users ...url.Userinfo) Option {
return func(opts Options) {
opts.BaseOptions().Users = users
}
}
func GetOption(i interface{}, opt string) interface{} {
ps := reflect.ValueOf(i)
if ps.Kind() != reflect.Ptr && ps.Kind() != reflect.Interface {
......
ss.go
View file @ 822cc6ac
......@@ -3,7 +3,6 @@ package gost
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"io"
"net"
......@@ -11,72 +10,126 @@ import (
"time"
"github.com/ginuerzh/gosocks5"
"github.com/go-log/log"
"github.com/golang/glog"
ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
)
const (
idType = 0 // address type index
idIP0 = 1 // ip addres start index
idDmLen = 1 // domain address length index
idDm0 = 2 // domain address start index
// Due to in/out byte length is inconsistent of the shadowsocks.Conn.Write,
// we wrap around it to make io.Copy happy
type shadowConn struct {
conn net.Conn
}
typeIPv4 = 1 // type is ipv4 address
typeDm = 3 // type is domain address
typeIPv6 = 4 // type is ipv6 address
func ShadowConn(conn net.Conn) net.Conn {
return &shadowConn{conn: conn}
}
lenIPv4 = net.IPv4len + 2 // ipv4 + 2port
lenIPv6 = net.IPv6len + 2 // ipv6 + 2port
lenDmBase = 2 // 1addrLen + 2port, plus addrLen
lenHmacSha1 = 10
)
func (c *shadowConn) Read(b []byte) (n int, err error) {
return c.conn.Read(b)
}
type ShadowServer struct {
conn *ss.Conn
Base *ProxyServer
OTA bool // one time auth
func (c *shadowConn) Write(b []byte) (n int, err error) {
n = len(b) // force byte length consistent
_, err = c.conn.Write(b)
return
}
func (c *shadowConn) Close() error {
return c.conn.Close()
}
func (c *shadowConn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
func (c *shadowConn) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
func (c *shadowConn) SetDeadline(t time.Time) error {
return c.conn.SetDeadline(t)
}
func (c *shadowConn) SetReadDeadline(t time.Time) error {
return c.conn.SetReadDeadline(t)
}
func (c *shadowConn) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}
func NewShadowServer(conn *ss.Conn, base *ProxyServer) *ShadowServer {
return &ShadowServer{conn: conn, Base: base}
type shadowHandler struct {
server Server
}
func (s *ShadowServer) Serve() {
glog.V(LINFO).Infof("[ss] %s - %s", s.conn.RemoteAddr(), s.conn.LocalAddr())
func ShadowHandler(server Server) Handler {
return &shadowHandler{server: server}
}
func (h *shadowHandler) Handle(conn net.Conn) {
var method, password string
users := h.server.Options().BaseOptions().Users
if len(users) > 0 {
method = users[0].Username()
password, _ = users[0].Password()
}
cipher, err := ss.NewCipher(method, password)
if err != nil {
log.Log("[ss]", err)
return
}
conn = ShadowConn(ss.NewConn(conn, cipher))
log.Logf("[ss] %s - %s", conn.RemoteAddr(), conn.LocalAddr())
addr, ota, err := s.getRequest()
addr, err := h.getRequest(conn)
if err != nil {
glog.V(LWARNING).Infof("[ss] %s - %s : %s", s.conn.RemoteAddr(), s.conn.LocalAddr(), err)
log.Logf("[ss] %s - %s : %s", conn.RemoteAddr(), conn.LocalAddr(), err)
return
}
glog.V(LINFO).Infof("[ss] %s -> %s, ota: %v", s.conn.RemoteAddr(), addr, ota)
log.Logf("[ss] %s -> %s", conn.RemoteAddr(), addr)
cc, err := s.Base.Chain.Dial(addr)
cc, err := h.server.Chain().Dial(addr)
if err != nil {
glog.V(LWARNING).Infof("[ss] %s -> %s : %s", s.conn.RemoteAddr(), addr, err)
log.Logf("[ss] %s -> %s : %s", conn.RemoteAddr(), addr, err)
return
}
defer cc.Close()
glog.V(LINFO).Infof("[ss] %s <-> %s", s.conn.RemoteAddr(), addr)
if ota {
s.transportOTA(s.conn, cc)
} else {
s.Base.transport(&shadowConn{conn: s.conn}, cc)
}
glog.V(LINFO).Infof("[ss] %s >-< %s", s.conn.RemoteAddr(), addr)
log.Logf("[ss] %s <-> %s", conn.RemoteAddr(), addr)
defer log.Logf("[ss] %s >-< %s", conn.RemoteAddr(), addr)
Transport(conn, cc)
}
const (
idType = 0 // address type index
idIP0 = 1 // ip addres start index
idDmLen = 1 // domain address length index
idDm0 = 2 // domain address start index
typeIPv4 = 1 // type is ipv4 address
typeDm = 3 // type is domain address
typeIPv6 = 4 // type is ipv6 address
lenIPv4 = net.IPv4len + 2 // ipv4 + 2port
lenIPv6 = net.IPv6len + 2 // ipv6 + 2port
lenDmBase = 2 // 1addrLen + 2port, plus addrLen
lenHmacSha1 = 10
)
// This function is copied from shadowsocks library with some modification.
func (s *ShadowServer) getRequest() (host string, ota bool, err error) {
func (h *shadowHandler) getRequest(conn net.Conn) (host string, err error) {
// buf size should at least have the same size with the largest possible
// request size (when addrType is 3, domain name has at most 256 bytes)
// 1(addrType) + 1(lenByte) + 256(max length address) + 2(port)
buf := make([]byte, SmallBufferSize)
// read till we get possible domain length field
s.conn.SetReadDeadline(time.Now().Add(ReadTimeout))
if _, err = io.ReadFull(s.conn, buf[:idType+1]); err != nil {
conn.SetReadDeadline(time.Now().Add(30 * time.Second))
if _, err = io.ReadFull(conn, buf[:idType+1]); err != nil {
return
}
......@@ -88,7 +141,7 @@ func (s *ShadowServer) getRequest() (host string, ota bool, err error) {
case typeIPv6:
reqStart, reqEnd = idIP0, idIP0+lenIPv6
case typeDm:
if _, err = io.ReadFull(s.conn, buf[idType+1:idDmLen+1]); err != nil {
if _, err = io.ReadFull(conn, buf[idType+1:idDmLen+1]); err != nil {
return
}
reqStart, reqEnd = idDm0, int(idDm0+buf[idDmLen]+lenDmBase)
......@@ -97,7 +150,7 @@ func (s *ShadowServer) getRequest() (host string, ota bool, err error) {
return
}
if _, err = io.ReadFull(s.conn, buf[reqStart:reqEnd]); err != nil {
if _, err = io.ReadFull(conn, buf[reqStart:reqEnd]); err != nil {
return
}
......@@ -115,129 +168,9 @@ func (s *ShadowServer) getRequest() (host string, ota bool, err error) {
// parse port
port := binary.BigEndian.Uint16(buf[reqEnd-2 : reqEnd])
host = net.JoinHostPort(host, strconv.Itoa(int(port)))
// if specified one time auth enabled, we should verify this
if s.OTA || addrType&ss.OneTimeAuthMask > 0 {
ota = true
if _, err = io.ReadFull(s.conn, buf[reqEnd:reqEnd+lenHmacSha1]); err != nil {
return
}
iv := s.conn.GetIv()
key := s.conn.GetKey()
actualHmacSha1Buf := ss.HmacSha1(append(iv, key...), buf[:reqEnd])
if !bytes.Equal(buf[reqEnd:reqEnd+lenHmacSha1], actualHmacSha1Buf) {
err = fmt.Errorf("verify one time auth failed, iv=%v key=%v data=%v", iv, key, buf[:reqEnd])
return
}
}
return
}
const (
dataLenLen = 2
hmacSha1Len = 10
idxData0 = dataLenLen + hmacSha1Len
)
// copyOta copies data from src to dst with ota verification.
//
// This function is copied from shadowsocks library with some modification.
func (s *ShadowServer) copyOta(dst net.Conn, src *ss.Conn) (int64, error) {
// sometimes it have to fill large block
buf := make([]byte, LargeBufferSize)
for {
src.SetReadDeadline(time.Now().Add(ReadTimeout))
if n, err := io.ReadFull(src, buf[:dataLenLen+hmacSha1Len]); err != nil {
return int64(n), err
}
src.SetReadDeadline(time.Time{})
dataLen := binary.BigEndian.Uint16(buf[:dataLenLen])
expectedHmacSha1 := buf[dataLenLen:idxData0]
var dataBuf []byte
if len(buf) < int(idxData0+dataLen) {
dataBuf = make([]byte, dataLen)
} else {
dataBuf = buf[idxData0 : idxData0+dataLen]
}
if n, err := io.ReadFull(src, dataBuf); err != nil {
return int64(n), err
}
chunkIdBytes := make([]byte, 4)
chunkId := src.GetAndIncrChunkId()
binary.BigEndian.PutUint32(chunkIdBytes, chunkId)
actualHmacSha1 := ss.HmacSha1(append(src.GetIv(), chunkIdBytes...), dataBuf)
if !bytes.Equal(expectedHmacSha1, actualHmacSha1) {
return 0, errors.New("ota error: mismatch")
}
if n, err := dst.Write(dataBuf); err != nil {
return int64(n), err
}
}
}
func (s *ShadowServer) transportOTA(sc *ss.Conn, cc net.Conn) (err error) {
errc := make(chan error, 2)
go func() {
_, err := io.Copy(&shadowConn{conn: sc}, cc)
errc <- err
}()
go func() {
_, err := s.copyOta(cc, sc)
errc <- err
}()
select {
case err = <-errc:
//glog.V(LWARNING).Infoln("transport exit", err)
}
return
}
// Due to in/out byte length is inconsistent of the shadowsocks.Conn.Write,
// we wrap around it to make io.Copy happy
type shadowConn struct {
conn *ss.Conn
}
func (c *shadowConn) Read(b []byte) (n int, err error) {
return c.conn.Read(b)
}
func (c *shadowConn) Write(b []byte) (n int, err error) {
n = len(b) // force byte length consistent
_, err = c.conn.Write(b)
return
}
func (c *shadowConn) Close() error {
return c.conn.Close()
}
func (c *shadowConn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
func (c *shadowConn) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
func (c *shadowConn) SetDeadline(t time.Time) error {
return c.conn.SetDeadline(t)
}
func (c *shadowConn) SetReadDeadline(t time.Time) error {
return c.conn.SetReadDeadline(t)
}
func (c *shadowConn) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}
type ShadowUdpServer struct {
Base *ProxyServer
TTL int
......
ssocks/ssocks.go deleted 100644 → 0
View file @ 9884015d
package ssocks
import (
"encoding/binary"
"fmt"
"io"
"net"
"net/url"
"strconv"
"time"
"github.com/go-log/log"
"github.com/ginuerzh/gost"
ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
)
// Due to in/out byte length is inconsistent of the shadowsocks.Conn.Write,
// we wrap around it to make io.Copy happy
type shadowConn struct {
conn net.Conn
}
func NewConn(conn net.Conn) net.Conn {
return &shadowConn{conn: conn}
}
func (c *shadowConn) Read(b []byte) (n int, err error) {
return c.conn.Read(b)
}
func (c *shadowConn) Write(b []byte) (n int, err error) {
n = len(b) // force byte length consistent
_, err = c.conn.Write(b)
return
}
func (c *shadowConn) Close() error {
return c.conn.Close()
}
func (c *shadowConn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
func (c *shadowConn) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
func (c *shadowConn) SetDeadline(t time.Time) error {
return c.conn.SetDeadline(t)
}
func (c *shadowConn) SetReadDeadline(t time.Time) error {
return c.conn.SetReadDeadline(t)
}
func (c *shadowConn) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}
const (
idType = 0 // address type index
idIP0 = 1 // ip addres start index
idDmLen = 1 // domain address length index
idDm0 = 2 // domain address start index
typeIPv4 = 1 // type is ipv4 address
typeDm = 3 // type is domain address
typeIPv6 = 4 // type is ipv6 address
lenIPv4 = net.IPv4len + 2 // ipv4 + 2port
lenIPv6 = net.IPv6len + 2 // ipv6 + 2port
lenDmBase = 2 // 1addrLen + 2port, plus addrLen
lenHmacSha1 = 10
)
type ShadowServer struct {
conn net.Conn
base gost.Server
}
func NewServer(conn net.Conn, cipher *url.Userinfo, base gost.Server) (*ShadowServer, error) {
method := cipher.Username()
password, _ := cipher.Password()
cp, err := ss.NewCipher(method, password)
if err != nil {
return nil, err
}
return &ShadowServer{conn: ss.NewConn(conn, cp), base: base}, nil
}
func (s *ShadowServer) Serve() error {
log.Logf("[ss] %s - %s", s.conn.RemoteAddr(), s.conn.LocalAddr())
addr, err := s.getRequest()
if err != nil {
log.Logf("[ss] %s - %s : %s", s.conn.RemoteAddr(), s.conn.LocalAddr(), err)
return err
}
log.Logf("[ss] %s -> %s", s.conn.RemoteAddr(), addr)
cc, err := s.base.Chain().Dial(addr)
if err != nil {
log.Logf("[ss] %s -> %s : %s", s.conn.RemoteAddr(), addr, err)
return err
}
defer cc.Close()
log.Logf("[ss] %s <-> %s", s.conn.RemoteAddr(), addr)
defer log.Logf("[ss] %s >-< %s", s.conn.RemoteAddr(), addr)
return gost.Transport(&shadowConn{conn: s.conn}, cc)
}
// This function is copied from shadowsocks library with some modification.
func (s *ShadowServer) getRequest() (host string, err error) {
// buf size should at least have the same size with the largest possible
// request size (when addrType is 3, domain name has at most 256 bytes)
// 1(addrType) + 1(lenByte) + 256(max length address) + 2(port)
buf := make([]byte, gost.SmallBufferSize)
// read till we get possible domain length field
s.conn.SetReadDeadline(time.Now().Add(30 * time.Second))
if _, err = io.ReadFull(s.conn, buf[:idType+1]); err != nil {
return
}
var reqStart, reqEnd int
addrType := buf[idType]
switch addrType & ss.AddrMask {
case typeIPv4:
reqStart, reqEnd = idIP0, idIP0+lenIPv4
case typeIPv6:
reqStart, reqEnd = idIP0, idIP0+lenIPv6
case typeDm:
if _, err = io.ReadFull(s.conn, buf[idType+1:idDmLen+1]); err != nil {
return
}
reqStart, reqEnd = idDm0, int(idDm0+buf[idDmLen]+lenDmBase)
default:
err = fmt.Errorf("addr type %d not supported", addrType&ss.AddrMask)
return
}
if _, err = io.ReadFull(s.conn, buf[reqStart:reqEnd]); err != nil {
return
}
// Return string for typeIP is not most efficient, but browsers (Chrome,
// Safari, Firefox) all seems using typeDm exclusively. So this is not a
// big problem.
switch addrType & ss.AddrMask {
case typeIPv4:
host = net.IP(buf[idIP0 : idIP0+net.IPv4len]).String()
case typeIPv6:
host = net.IP(buf[idIP0 : idIP0+net.IPv6len]).String()
case typeDm:
host = string(buf[idDm0 : idDm0+buf[idDmLen]])
}
// parse port
port := binary.BigEndian.Uint16(buf[reqEnd-2 : reqEnd])
host = net.JoinHostPort(host, strconv.Itoa(int(port)))
return
}
tcp/client.go
View file @ 822cc6ac
......@@ -14,8 +14,8 @@ import (
"github.com/ginuerzh/gosocks4"
"github.com/ginuerzh/gosocks5"
"github.com/ginuerzh/gost"
"github.com/ginuerzh/gost/socks"
"github.com/ginuerzh/gost/ssocks"
"github.com/go-log/log"
ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
)
......@@ -45,8 +45,9 @@ func (c *nodeClient) Dial(conn net.Conn, addr string) (net.Conn, error) {
gosocks5.MethodUserPass,
socks.MethodTLS,
)
if len(c.options.users) > 0 {
selector.User = &c.options.users[0]
users := c.options.BaseOptions().Users
if len(users) > 0 {
selector.User = &users[0]
}
cc := gosocks5.ClientConn(conn, selector)
......@@ -69,9 +70,10 @@ func (c *nodeClient) dial(conn net.Conn, addr string) (net.Conn, error) {
}
var method, password string
if len(c.options.users) > 0 {
method = c.options.users[0].Username()
password, _ = c.options.users[0].Password()
users := c.options.BaseOptions().Users
if len(users) > 0 {
method = users[0].Username()
password, _ = users[0].Password()
}
cipher, err := ss.NewCipher(method, password)
......@@ -83,7 +85,7 @@ func (c *nodeClient) dial(conn net.Conn, addr string) (net.Conn, error) {
if err != nil {
return nil, err
}
conn = ssocks.NewConn(sc)
conn = gost.ShadowConn(sc)
case "socks5":
host, port, err := net.SplitHostPort(addr)
......@@ -155,8 +157,9 @@ func (c *nodeClient) dial(conn net.Conn, addr string) (net.Conn, error) {
Header: make(http.Header),
}
req.Header.Set("Proxy-Connection", "keep-alive")
if len(c.options.users) > 0 {
user := c.options.users[0]
users := c.options.BaseOptions().Users
if len(users) > 0 {
user := users[0]
s := user.String()
if _, set := user.Password(); !set {
s += ":"
......
tcp/options.go
View file @ 822cc6ac
package tcp
import (
"net/url"
"github.com/ginuerzh/gost"
)
type nodeOptions struct {
base *gost.BaseOptions
users []url.Userinfo `opt:"users"` // authentication for proxy
certFile string `opt:"cert"`
keyFile string `opt:"key"`
serverName string `opt:"server_name"`
secureVerify bool `opt:"secure"`
certFile string `opt:"cert"`
keyFile string `opt:"key"`
serverName string `opt:"server_name"`
secureVerify bool `opt:"secure"`
}
func (o *nodeOptions) BaseOptions() *gost.BaseOptions {
return o.base
}
func UsersOption(users ...url.Userinfo) gost.Option {
return func(opts gost.Options) {
if o, ok := opts.(*nodeOptions); ok {
o.users = users
}
}
}
func (o *nodeOptions) ServerNameOption(n string) gost.Option {
return func(opts gost.Options) {
if o, ok := opts.(*nodeOptions); ok {
......
tcp/server.go
View file @ 822cc6ac
......@@ -4,13 +4,12 @@ import (
"bufio"
"net"
"net/http"
"net/url"
"weed-fs/go/glog"
"github.com/ginuerzh/gosocks4"
"github.com/ginuerzh/gosocks5"
"github.com/ginuerzh/gost"
"github.com/ginuerzh/gost/ssocks"
"github.com/go-log/log"
)
type nodeServer struct {
......@@ -42,26 +41,28 @@ func (s *nodeServer) Run() error {
if err != nil {
return err
}
go s.handleConn(conn)
go func(c net.Conn) {
defer c.Close()
s.handleConn(c)
}(conn)
}
}
func (s *nodeServer) handleConn(conn net.Conn) {
defer conn.Close()
switch s.options.BaseOptions().Protocol {
case "ss": // shadowsocks
var cipher url.Userinfo
if len(s.options.users) > 0 {
cipher = s.options.users[0]
server, err := ssocks.NewServer(conn, s)
if err != nil {
log.Log("[ss]", err)
}
server := ssocks.NewServer(conn, &cipher, s)
server.Serve()
return
case "http":
req, err := http.ReadRequest(bufio.NewReader(conn))
if err != nil {
glog.V(LWARNING).Infoln("[http]", err)
log.Log("[http]", err)
return
}
NewHttpServer(conn, s).HandleRequest(req)
......@@ -70,7 +71,7 @@ func (s *nodeServer) handleConn(conn net.Conn) {
conn = gosocks5.ServerConn(conn, s.selector)
req, err := gosocks5.ReadRequest(conn)
if err != nil {
glog.V(LWARNING).Infoln("[socks5]", err)
log.Log("[socks5]", err)
return
}
NewSocks5Server(conn, s).HandleRequest(req)
......@@ -78,7 +79,7 @@ func (s *nodeServer) handleConn(conn net.Conn) {
case "socks4", "socks4a":
req, err := gosocks4.ReadRequest(conn)
if err != nil {
glog.V(LWARNING).Infoln("[socks4]", err)
log.Log("[socks4]", err)
return
}
NewSocks4Server(conn, s).HandleRequest(req)
......@@ -88,7 +89,7 @@ func (s *nodeServer) handleConn(conn net.Conn) {
br := bufio.NewReader(conn)
b, err := br.Peek(1)
if err != nil {
glog.V(LWARNING).Infoln(err)
log.Log(err)
return
}
......@@ -96,7 +97,7 @@ func (s *nodeServer) handleConn(conn net.Conn) {
case gosocks4.Ver4:
req, err := gosocks4.ReadRequest(br)
if err != nil {
glog.V(LWARNING).Infoln("[socks4]", err)
log.Log("[socks4]", err)
return
}
NewSocks4Server(conn, s).HandleRequest(req)
......@@ -104,24 +105,24 @@ func (s *nodeServer) handleConn(conn net.Conn) {
case gosocks5.Ver5:
methods, err := gosocks5.ReadMethods(br)
if err != nil {
glog.V(LWARNING).Infoln("[socks5]", err)
log.Log("[socks5]", err)
return
}
method := s.selector.Select(methods...)
if _, err := conn.Write([]byte{gosocks5.Ver5, method}); err != nil {
glog.V(LWARNING).Infoln("[socks5] select:", err)
log.Log("[socks5] select:", err)
return
}
c, err := s.selector.OnSelected(method, conn)
if err != nil {
glog.V(LWARNING).Infoln("[socks5] onselected:", err)
log.Log("[socks5] onselected:", err)
return
}
conn = c
req, err := gosocks5.ReadRequest(conn)
if err != nil {
glog.V(LWARNING).Infoln("[socks5] request:", err)
log.Log("[socks5] request:", err)
return
}
NewSocks5Server(conn, s).HandleRequest(req)
......@@ -129,7 +130,7 @@ func (s *nodeServer) handleConn(conn net.Conn) {
default: // http
req, err := http.ReadRequest(br)
if err != nil {
glog.V(LWARNING).Infoln("[http]", err)
log.Log("[http]", err)
return
}
NewHttpServer(conn, s).HandleRequest(req)
......
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