forked from lilmayofuksu/gidra
/
handlers.go
154 lines (130 loc) · 3.58 KB
/
handlers.go
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package proxy
import (
"encoding/base64"
"sync"
"github.com/MoonlightPS/Iridium-gidra/gover/gen"
"github.com/MoonlightPS/Iridium-gidra/gover/utils"
"github.com/yezihack/colorlog"
)
type Handler = func(*KCPConn, []byte, bool) ([]byte, error)
var handlersMap = map[int]Handler{}
var b64 = base64.StdEncoding
var prngHistory = struct {
seeds []uint64
mu sync.Mutex
}{}
func saveSeed(seed uint64) {
prngHistory.mu.Lock()
defer prngHistory.mu.Unlock()
prngHistory.seeds = append(prngHistory.seeds, seed)
}
func sniffSeed(mSeed, sentMs uint64) uint64 {
find := func(ts uint64) uint64 {
prng := utils.NewCompatPrng(int32(ts))
for times := 0; times < 1e5; times++ {
seed := prng.SafeUInt64()
if seed == mSeed {
colorlog.Debug("seed found, seed: %d with ts: %d by times: %d", seed, ts, times)
return seed
}
}
return 0
}
for _, ts := range prngHistory.seeds {
if seed := find(ts); seed != 0 {
colorlog.Debug("seed found from history")
return seed
}
}
for times := uint64(0); times < 1e5; times++ {
if seed := find(sentMs + times); seed != 0 {
saveSeed(sentMs + times)
return seed
}
if seed := find(sentMs - times); seed != 0 {
saveSeed(sentMs - times)
return seed
}
}
colorlog.Debug("seed not found")
return 0
}
func HandleGetPlayerTokenReq(conn *KCPConn, data []byte, bypass bool) ([]byte, error) {
msg, err := conn.parser.Parse(data)
if err != nil {
return nil, err
}
body := msg.Body.(*gen.GetPlayerTokenReq)
if bypass {
conn.clientSeed = msg.Header.GetSentMs()
return conn.parser.Compose(msg)
}
seedEncrypted, err := b64.DecodeString(body.GetClientRandKey())
if err != nil {
return nil, err
}
seedBytes, err := utils.Decrypt(seedEncrypted, utils.SIGN_KEY)
if err != nil {
return nil, err
}
conn.seed = be.Uint64(seedBytes)
sniffSeed(conn.seed, msg.Header.GetSentMs())
keyID := int(body.GetKeyId()) + 1000
seedEncrypted, err = utils.Encrypt(seedBytes, keyID)
if err != nil {
return nil, err
}
body.ClientRandKey = b64.EncodeToString(seedEncrypted)
return conn.parser.Compose(msg)
}
func HandleGetPlayerTokenRsp(conn *KCPConn, data []byte, bypass bool) ([]byte, error) {
msg, err := conn.parser.Parse(data)
if err != nil {
return nil, err
}
body := msg.Body.(*gen.GetPlayerTokenRsp)
seedEncrypted, err := b64.DecodeString(body.GetServerRandKey())
if err != nil {
return nil, err
}
keyID := int(body.GetKeyId())
seedBytes, err := utils.Decrypt(seedEncrypted, keyID)
if err != nil {
return nil, err
}
if bypass {
conn.seed = be.Uint64(seedBytes)
return conn.parser.Compose(msg)
}
conn.seed = be.Uint64(seedBytes) ^ conn.seed
colorlog.Info("get server key: %d", conn.seed)
signature, err := utils.Sign(seedBytes, utils.SIGN_KEY)
if err != nil {
return nil, err
}
body.Sign = b64.EncodeToString(signature)
ret, err := conn.parser.Compose(msg)
conn.key.GenKey(conn.seed)
return ret, err
}
func HandlePlayerLoginReq(conn *KCPConn, data []byte, bypass bool) ([]byte, error) {
if bypass {
return data, nil
}
msg, err := conn.parser.Parse(data)
if err != nil {
return nil, err
}
body := msg.Body.(*gen.PlayerLoginReq)
if conn.keyID == utils.CN_KEY || conn.keyID == utils.CN1_KEY {
body.Checksum = "4fa709ab639fc791f8288975f0428f0c912b36de981c9553145ce0c7a35f088725"
} else {
body.Checksum = "c1fed3cda007abe60b0d17c6c7a5442aec6d3bc7770693949a7b1ab0483fc16225"
}
return conn.parser.Compose(msg)
}
func init() {
handlersMap[utils.GetPlayerTokenReq] = HandleGetPlayerTokenReq
handlersMap[utils.GetPlayerTokenRsp] = HandleGetPlayerTokenRsp
handlersMap[utils.PlayerLoginReq] = HandlePlayerLoginReq
}