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udp_linux.go
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udp_linux.go
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package phantomtcp
import (
"encoding/binary"
"math/rand"
"net"
"github.com/macronut/go-tproxy"
)
func TProxyUDP(address string) {
laddr, err := net.ResolveUDPAddr("udp", address)
if err != nil {
logPrintln(1, err)
return
}
client, err := tproxy.ListenUDP("udp", laddr)
if err != nil {
logPrintln(1, err)
return
}
defer client.Close()
data := make([]byte, 1500)
for {
n, srcAddr, dstAddr, err := tproxy.ReadFromUDP(client, data)
if err != nil {
logPrintln(1, err)
continue
}
var host string
dstIP4 := dstAddr.IP.To4()
if dstIP4 != nil {
if dstIP4[0] == VirtualAddrPrefix {
index := int(binary.BigEndian.Uint16(dstIP4[2:4]))
if index >= len(Nose) {
logPrintln(4, "TProxy(UDP):", srcAddr, "->", dstAddr, "out of range")
continue
}
host = Nose[index]
} else {
continue
}
} else if dstAddr.IP[0] == 0 {
index := int(binary.BigEndian.Uint32(dstAddr.IP[12:16]))
if index >= len(Nose) {
logPrintln(4, "TProxy(UDP):", srcAddr, "->", dstAddr, "out of range")
continue
}
host = Nose[index]
} else {
continue
}
server := ConfigLookup(host)
if server.Hint&OPT_UDP == 0 {
if server.Hint&(OPT_HTTP3) == 0 {
logPrintln(4, "TProxy(UDP):", srcAddr, "->", dstAddr, "not allow")
continue
}
if GetQUICVersion(data[:n]) == 0 {
logPrintln(4, "TProxy(UDP):", srcAddr, "->", dstAddr, "not h3")
continue
}
}
logPrintln(1, "TProxy(UDP):", srcAddr, "->", host, dstAddr.Port, server)
localConn, err := tproxy.DialUDP("udp", dstAddr, srcAddr)
if err != nil {
logPrintln(1, err)
continue
}
remoteConn, proxyConn, err := server.DialUDP(host, dstAddr.Port)
if err != nil {
logPrintln(1, err)
localConn.Close()
if proxyConn != nil {
proxyConn.Close()
}
continue
}
if server.Hint&OPT_ZERO != 0 {
zero_data := make([]byte, 8+rand.Intn(1024))
_, err = remoteConn.Write(zero_data)
if err != nil {
logPrintln(1, err)
localConn.Close()
if proxyConn != nil {
proxyConn.Close()
}
continue
}
}
_, err = remoteConn.Write(data[:n])
if err != nil {
logPrintln(1, err)
localConn.Close()
if proxyConn != nil {
proxyConn.Close()
}
continue
}
go func(localConn, remoteConn, proxyConn net.Conn) {
relayUDP(localConn, remoteConn)
remoteConn.Close()
localConn.Close()
if proxyConn != nil {
proxyConn.Close()
}
}(localConn, remoteConn, proxyConn)
}
}