sing-box/transport/clashssr/protocol/auth_chain_b.go

98 lines
2.3 KiB
Go

package protocol
import (
"net"
"sort"
"github.com/Dreamacro/clash/transport/ssr/tools"
)
func init() {
register("auth_chain_b", newAuthChainB, 4)
}
type authChainB struct {
*authChainA
dataSizeList []int
dataSizeList2 []int
}
func newAuthChainB(b *Base) Protocol {
a := &authChainB{
authChainA: &authChainA{
Base: b,
authData: &authData{},
userData: &userData{},
salt: "auth_chain_b",
},
}
a.initUserData()
return a
}
func (a *authChainB) StreamConn(c net.Conn, iv []byte) net.Conn {
p := &authChainB{
authChainA: &authChainA{
Base: a.Base,
authData: a.next(),
userData: a.userData,
salt: a.salt,
packID: 1,
recvID: 1,
},
}
p.iv = iv
p.randDataLength = p.getRandLength
p.initDataSize()
return &Conn{Conn: c, Protocol: p}
}
func (a *authChainB) initDataSize() {
a.dataSizeList = a.dataSizeList[:0]
a.dataSizeList2 = a.dataSizeList2[:0]
a.randomServer.InitFromBin(a.Key)
length := a.randomServer.Next()%8 + 4
for ; length > 0; length-- {
a.dataSizeList = append(a.dataSizeList, int(a.randomServer.Next()%2340%2040%1440))
}
sort.Ints(a.dataSizeList)
length = a.randomServer.Next()%16 + 8
for ; length > 0; length-- {
a.dataSizeList2 = append(a.dataSizeList2, int(a.randomServer.Next()%2340%2040%1440))
}
sort.Ints(a.dataSizeList2)
}
func (a *authChainB) getRandLength(length int, lashHash []byte, random *tools.XorShift128Plus) int {
if length >= 1440 {
return 0
}
random.InitFromBinAndLength(lashHash, length)
pos := sort.Search(len(a.dataSizeList), func(i int) bool { return a.dataSizeList[i] >= length+a.Overhead })
finalPos := pos + int(random.Next()%uint64(len(a.dataSizeList)))
if finalPos < len(a.dataSizeList) {
return a.dataSizeList[finalPos] - length - a.Overhead
}
pos = sort.Search(len(a.dataSizeList2), func(i int) bool { return a.dataSizeList2[i] >= length+a.Overhead })
finalPos = pos + int(random.Next()%uint64(len(a.dataSizeList2)))
if finalPos < len(a.dataSizeList2) {
return a.dataSizeList2[finalPos] - length - a.Overhead
}
if finalPos < pos+len(a.dataSizeList2)-1 {
return 0
}
if length > 1300 {
return int(random.Next() % 31)
}
if length > 900 {
return int(random.Next() % 127)
}
if length > 400 {
return int(random.Next() % 521)
}
return int(random.Next() % 1021)
}