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login.go
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login.go
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package dhcp
import (
"bytes"
"crypto/md5"
"encoding/binary"
"encoding/hex"
"math/rand"
"net/netip"
"strings"
"time"
"github.com/cyp0633/drcom-go/internal/util"
"go.uber.org/zap"
)
// 登录
func login() (tail []byte, salt []byte, err error) {
salt, err = challenge()
if err != nil {
err = ErrorLogin
return
}
loginPacket, err := genLoginPacket(salt)
if err != nil {
err = ErrorLogin
return
}
// 发送
_, err = conn.Write(loginPacket)
if err != nil {
util.Logger.Error("Sending login packet failed", zap.Error(err))
err = ErrorLogin
return
}
conn.Flush()
util.Logger.Debug("Login packet sent", zap.String("packet", hex.EncodeToString(loginPacket)))
// 读取登录结果,限时 1s
result := make([]byte, 1024)
udpConn.SetDeadline(time.Now().Add(time.Second))
n, err := conn.Read(result)
udpConn.SetDeadline(time.Time{})
if err != nil {
util.Logger.Error("Reading login result failed", zap.Error(err))
conn.Flush()
err = ErrorLogin
return
}
util.Logger.Debug("Login result recv", zap.String("packet", hex.EncodeToString(result[:n])), zap.Int("len", n))
if bytes.Equal(result[0:1], []byte{0x04}) { // 登录成功
util.Logger.Info("Logged in")
tail = result[23:39] // 同时也是 authinfo
return
} else { // 登录失败
util.Logger.Error("Login failed")
err = ErrorLogin
if result[0] == 0x05 { // 使用 mchome/dogcom 的错误类型判断
switch result[4] {
case 0x01:
util.Logger.Info("CHECK_MAC", zap.String("tip", "MAC address in use by another user"))
case 0x02:
util.Logger.Info("SERVER_BUSY", zap.String("tip", "Wait for a while and try again"))
case 0x03:
util.Logger.Info("WRONG_PASS", zap.String("tip", "Check your password"))
case 0x04:
util.Logger.Info("NOT_ENOUGH", zap.String("tip", "Check your time/traffic balance"))
case 0x05:
util.Logger.Info("FREEZE_UP", zap.String("tip", "Account suspended"))
case 0x07:
util.Logger.Info("NOT_ON_THIS_IP", zap.String("tip", "IP address is restricted"))
case 0x11:
util.Logger.Info("NOT_ON_THIS_MAC", zap.String("tip", "MAC address is restricted"))
case 0x20:
util.Logger.Info("TOO_MUCH_IP", zap.String("tip", "Too many devices in use"))
case 0x21:
util.Logger.Info("UPDATE_CLIENT", zap.String("tip", "The target version is not supported"))
case 0x22:
util.Logger.Info("NOT_ON_THIS_IP_MAC", zap.String("tip", "IP/MAC address is restricted"))
case 0x23:
util.Logger.Info("MUST_USE_DHCP", zap.String("tip", "Turn on DHCP instead of static IP"))
}
}
}
return
}
// 发送 challenge 并获得 salt
func challenge() (salt []byte, err error) {
pkt := make([]byte, 20)
pkt[0] = 0x01
pkt[1] = 0x02
pkt[2] = byte(rand.Intn(0xff))
pkt[3] = byte(rand.Intn(0xff))
pkt[4] = util.Conf.AuthVersion[0]
_, err = conn.Write(pkt)
if err != nil {
util.Logger.Error("Sending challenge failed", zap.Error(err))
err = ErrorChallenge
return
}
conn.Flush()
util.Logger.Debug("Challenge sent", zap.String("packet", hex.EncodeToString(pkt)))
// 读取 salt
salt = make([]byte, 1024)
n, err := conn.Read(salt)
if err != nil {
util.Logger.Error("Reading challenge salt failed", zap.Error(err))
err = ErrorChallenge
return
}
util.Logger.Debug("Challenge recv", zap.String("packet", hex.EncodeToString(salt[:n])), zap.Int("len", n), zap.String("salt", hex.EncodeToString(salt[4:8])))
// 长度应为 40 字节
if len(salt) == 106 {
util.Logger.Error("Challenge reply length does not match")
err = ErrorChallenge
return
}
salt = salt[4:8] // 前一部分只有 [4:8] 不同,看起来有用
return
}
// 合成登录数据报
func genLoginPacket(salt []byte) (loginPacket []byte, err error) {
if util.Conf.RorVersion {
loginPacket = make([]byte, 338)
} else {
loginPacket = make([]byte, 330)
}
// LoginPacket
{
// DrComHeader 0-3
loginPacket[0] = 0x03
loginPacket[1] = 0x01
loginPacket[2] = 0x00
loginPacket[3] = byte(len(util.Conf.Username) + 20)
// PasswordMD5 4-19
md51 := md5.Sum(append(append([]byte{0x03, 0x01}, salt...), []byte(util.Conf.Password)...)) // 好 tm 丑陋
copy(loginPacket[4:], md51[:])
// Username 20-55
copy(loginPacket[20:], []byte(util.Conf.Username))
// ControlCheckStatus 56
loginPacket[56] = util.Conf.ControlCheckStatus
// AdapterNum 57
loginPacket[57] = util.Conf.AdapterNum
// MacAddrXORPasswordMD5 58-63
xor := binary.BigEndian.Uint64(loginPacket[2:10]) ^ binary.BigEndian.Uint64(append([]byte("\x00\x00"), util.Conf.MacBytes...)) // 最后只取 6 位,这里 8 位也没关系,注意大端序
binary.BigEndian.PutUint64(loginPacket[58:], xor)
// PasswordMD5_2 64-79
md52 := md5.Sum(append(append(append([]byte{1}, []byte(util.Conf.Password)...), salt...), []byte{0, 0, 0, 0}...)) // 更 tm 丑陋了
copy(loginPacket[64:], md52[:])
// HostIpNum 80
loginPacket[80] = 0x01
// HostIpList 81-96
// Fill in only 1 IP here
strings.Split(util.Conf.HostIP, ".")
var ip netip.Addr
ip, err = netip.ParseAddr(util.Conf.HostIP)
if err != nil {
util.Logger.Error("Parse HostIP configuration failed", zap.Error(err), zap.String("HostIP", util.Conf.HostIP))
err = ErrorGenLoginPacket
return
}
copy(loginPacket[81:], ip.AsSlice())
// HalfMD5 97-104
md53 := md5.Sum(append(loginPacket[:97], 0x14, 0x00, 0x07, 0x0b))
copy(loginPacket[97:], md53[:4])
// DogFlag 105
loginPacket[105] = util.Conf.IpDog
// HostInfo
{
// Hostname 110-141
copy(loginPacket[110:], []byte(util.Conf.Hostname))
// PrimaryDNS 142-145
var ip netip.Addr
ip, err = netip.ParseAddr(util.Conf.PrimaryDns)
if err != nil {
util.Logger.Error("Parse PrimaryDns configuration failed", zap.Error(err), zap.String("PrimaryDns", util.Conf.PrimaryDns))
err = ErrorGenLoginPacket
return
}
copy(loginPacket[142:], ip.AsSlice())
// DHCP 146-149
ip, err = netip.ParseAddr(util.Conf.DhcpServer)
if err != nil {
util.Logger.Error("Parse DhcpServer configuration failed", zap.Error(err), zap.String("DhcpServer", util.Conf.DhcpServer))
err = ErrorGenLoginPacket
return
}
copy(loginPacket[146:], ip.AsSlice())
// OSVersionInfo
{
// OSVersionInfoSize 162-165
loginPacket[162] = 0x94
loginPacket[163] = 0x00
loginPacket[164] = 0x00
loginPacket[165] = 0x00
// MajorVersion 166-169
loginPacket[166] = 0x10
loginPacket[167] = 0x00
loginPacket[168] = 0x00
loginPacket[169] = 0x00
// MinorVersion 170-173
loginPacket[170] = 0x00
loginPacket[171] = 0x00
loginPacket[172] = 0x00
loginPacket[173] = 0x00
// BuildNumber 174-177
loginPacket[174] = 0x00
loginPacket[175] = 0x28
loginPacket[176] = 0x00
loginPacket[177] = 0x00
// PlatformID 178-181
loginPacket[178] = 0x02
loginPacket[179] = 0x00
loginPacket[180] = 0x00
loginPacket[181] = 0x00
}
}
// AuthVersion 310-311
copy(loginPacket[310:], util.Conf.AuthVersion[:])
// ExtData
{
// Code 312
loginPacket[312] = 0x02
// Len
loginPacket[313] = 0x0c
// CRC 314-317
crc := util.Checksum(append(append(loginPacket, []byte{0x01, 0x26, 0x07, 0x11, 0x00, 0x00}...), util.Conf.MacBytes...))
copy(loginPacket[314:], crc[:])
// AdapterAddress 320-325
copy(loginPacket[320:], util.Conf.MacBytes)
}
// BroadcastMode 326
loginPacket[326] = 0xe9
// Unknown 327
loginPacket[327] = 0x13
}
return
}