Golang shadowsocks.SetReadTimeout函数代码示例

func getRequest(conn *ss.Conn) (host string, extra []byte, err error) {
	const (
		idType  = 0 // address type index
		idIP0   = 1 // ip addres start index
		idDmLen = 1 // domain address length index
		idDm0   = 2 // domain address start index

		typeIP = 1 // type is ip address
		typeDm = 3 // type is domain address

		lenIP     = 1 + 4 + 2 // 1addrType + 4ip + 2port
		lenDmBase = 1 + 1 + 2 // 1addrType + 1addrLen + 2port, plus addrLen
	)

	// 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, 260, 260)
	var n int
	// read till we get possible domain length field
	ss.SetReadTimeout(conn)
	if n, err = io.ReadAtLeast(conn, buf, idDmLen+1); err != nil {
		return
	}

	reqLen := lenIP
	if buf[idType] == typeDm {
		reqLen = int(buf[idDmLen]) + lenDmBase
	} else if buf[idType] != typeIP {
		err = errAddrType
		return
	}

	if n < reqLen { // rare case
		ss.SetReadTimeout(conn)
		if _, err = io.ReadFull(conn, buf[n:reqLen]); err != nil {
			return
		}
	} else if n > reqLen {
		// it's possible to read more than just the request head
		extra = buf[reqLen:n]
	}

	// TODO add ipv6 support
	if buf[idType] == typeDm {
		host = string(buf[idDm0 : idDm0+buf[idDmLen]])
	} else if buf[idType] == typeIP {
		addrIp := make(net.IP, 4)
		copy(addrIp, buf[idIP0:idIP0+4])
		host = addrIp.String()
	}
	// parse port
	var port int16
	sb := bytes.NewBuffer(buf[reqLen-2 : reqLen])
	binary.Read(sb, binary.BigEndian, &port)

	host += ":" + strconv.Itoa(int(port))
	return
}

func getRequest(conn *ss.Conn) (host string, extra []byte, err error) {
	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

		lenIP     = 1 + 4 + 2 // 1addrType + 4ip + 2port
		lenDmBase = 1 + 1 + 2 // 1addrType + 1addrLen + 2port, plus addrLen
	)

	// 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, 260, 260)
	var n int
	// read till we get possible domain length field
	ss.SetReadTimeout(conn)
	if n, err = io.ReadAtLeast(conn, buf, idDmLen+1); err != nil {
		return
	}

	// Currently the client will not send request with ipv6 address.
	reqLen := lenIP
	if buf[idType] == typeDm {
		reqLen = int(buf[idDmLen]) + lenDmBase
	} else if buf[idType] != typeIPv4 {
		err = errAddrType
		return
	}

	if n < reqLen { // rare case
		ss.SetReadTimeout(conn)
		if _, err = io.ReadFull(conn, buf[n:reqLen]); err != nil {
			return
		}
	} else if n > reqLen {
		// it's possible to read more than just the request head
		extra = buf[reqLen:n]
	}

	if buf[idType] == typeDm {
		host = string(buf[idDm0 : idDm0+buf[idDmLen]])
	} else if buf[idType] == typeIPv4 {
		addrIp := net.IPv4(buf[idIP0], buf[idIP0+1], buf[idIP0+2], buf[idIP0+3])
		host = addrIp.String()
	}
	// parse port
	port := binary.BigEndian.Uint16(buf[reqLen-2 : reqLen])
	host = net.JoinHostPort(host, strconv.Itoa(int(port)))
	return
}

func handShake(conn net.Conn) (err error) {
	const (
		idVer     = 0
		idNmethod = 1
	)
	// version identification and method selection message in theory can have
	// at most 256 methods, plus version and nmethod field in total 258 bytes
	// the current rfc defines only 3 authentication methods (plus 2 reserved),
	// so it won't be such long in practice

	buf := make([]byte, 258)

	var n int
	ss.SetReadTimeout(conn)
	// make sure we get the nmethod field
	if n, err = io.ReadAtLeast(conn, buf, idNmethod+1); err != nil {
		return
	}
	if buf[idVer] != socksVer5 {
		return errVer
	}
	nmethod := int(buf[idNmethod])
	msgLen := nmethod + 2
	if debug {
		debug.Printf("nmethod = %d, msgLen = %d.\n", nmethod, msgLen)
		ss.DumpMemory(buf, msgLen)
	}
	if n == msgLen { // handshake done, common case
		// do nothing, jump directly to send confirmation
	} else if n < msgLen { // has more methods to read, rare case
		if _, err = io.ReadFull(conn, buf[n:msgLen]); err != nil {
			return
		}
		if debug {
			ss.DumpMemory(buf, msgLen)
		}
	} else { // error, should not get extra data
		return errAuthExtraData
	}
	// send confirmation: version 5, no authentication required
	_, err = conn.Write([]byte{socksVer5, 0})
	return
}

func getRequest(conn net.Conn) (rawaddr []byte, host string, err error) {
	const (
		idVer   = 0
		idCmd   = 1
		idType  = 3 // address type index
		idIP0   = 4 // ip addres start index
		idDmLen = 4 // domain address length index
		idDm0   = 5 // domain address start index

		typeIPv4 = 1 // type is ipv4 address
		typeDm   = 3 // type is domain address
		typeIPv6 = 4 // type is ipv6 address

		lenIPv4   = 3 + 1 + net.IPv4len + 2 // 3(ver+cmd+rsv) + 1addrType + ipv4 + 2port
		lenIPv6   = 3 + 1 + net.IPv6len + 2 // 3(ver+cmd+rsv) + 1addrType + ipv6 + 2port
		lenDmBase = 3 + 1 + 1 + 2           // 3 + 1addrType + 1addrLen + 2port, plus addrLen
	)
	// refer to getRequest in server.go for why set buffer size to 263
	buf := make([]byte, 263)
	var n int
	ss.SetReadTimeout(conn)
	// read till we get possible domain length field
	if n, err = io.ReadAtLeast(conn, buf, idDmLen+1); err != nil {
		return
	}
	// check version and cmd
	if buf[idVer] != socksVer5 {
		err = errVer
		return
	}
	if buf[idCmd] != socksCmdConnect {
		err = errCmd
		return
	}

	reqLen := -1
	switch buf[idType] {
	case typeIPv4:
		reqLen = lenIPv4
	case typeIPv6:
		reqLen = lenIPv6
	case typeDm:
		reqLen = int(buf[idDmLen]) + lenDmBase
	default:
		err = errAddrType
		return
	}

	if n == reqLen {
		// common case, do nothing
	} else if n < reqLen { // rare case
		if _, err = io.ReadFull(conn, buf[n:reqLen]); err != nil {
			return
		}
	} else {
		err = errReqExtraData
		return
	}

	rawaddr = buf[idType:reqLen]

	if debug {
		switch buf[idType] {
		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]])
		}
		port := binary.BigEndian.Uint16(buf[reqLen-2 : reqLen])
		host = net.JoinHostPort(host, strconv.Itoa(int(port)))
	}

	return
}

func getRequest(conn *ss.Conn) (host string, extra []byte, err error) {
	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   = 1 + net.IPv4len + 2 // 1addrType + ipv4 + 2port
		lenIPv6   = 1 + net.IPv6len + 2 // 1addrType + ipv6 + 2port
		lenDmBase = 1 + 1 + 2           // 1addrType + 1addrLen + 2port, plus addrLen
	)

	// 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, 260)
	var n int
	// read till we get possible domain length field
	ss.SetReadTimeout(conn)
	if n, err = io.ReadAtLeast(conn, buf, idDmLen+1); err != nil {
		return
	}

	reqLen := -1
	switch buf[idType] {
	case typeIPv4:
		reqLen = lenIPv4
	case typeIPv6:
		reqLen = lenIPv6
	case typeDm:
		reqLen = int(buf[idDmLen]) + lenDmBase
	default:
		err = errors.New(fmt.Sprintf("addr type %d not supported", buf[idType]))
		return
	}

	if n < reqLen { // rare case
		ss.SetReadTimeout(conn)
		if _, err = io.ReadFull(conn, buf[n:reqLen]); err != nil {
			return
		}
	} else if n > reqLen {
		// it's possible to read more than just the request head
		extra = buf[reqLen:n]
	}

	// 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 buf[idType] {
	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[reqLen-2 : reqLen])
	host = net.JoinHostPort(host, strconv.Itoa(int(port)))
	return
}

func getRequest(conn *ss.Conn, auth bool) (host string, ota bool, err error) {
	ss.SetReadTimeout(conn)

	// 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) + 10(hmac-sha1)
	buf := make([]byte, 270)
	// read till we get possible domain length field
	if _, err = io.ReadFull(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(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(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)))
	// if specified one time auth enabled, we should verify this
	if auth || addrType&ss.OneTimeAuthMask > 0 {
		ota = true
		if _, err = io.ReadFull(conn, buf[reqEnd:reqEnd+lenHmacSha1]); err != nil {
			return
		}
		iv := conn.GetIv()
		key := 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
}