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udp: fix endianness for port #1194

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Aug 14, 2024
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udp: fix endianness for port #1194

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8 changes: 2 additions & 6 deletions udp/udp_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -218,9 +218,7 @@ func (u *StdConn) writeTo6(b []byte, ip netip.AddrPort) error {
var rsa unix.RawSockaddrInet6
rsa.Family = unix.AF_INET6
rsa.Addr = ip.Addr().As16()
port := ip.Port()
// Little Endian -> Network Endian
rsa.Port = (port >> 8) | ((port & 0xff) << 8)
binary.BigEndian.PutUint16((*[2]byte)(unsafe.Pointer(&rsa.Port))[:], ip.Port())

for {
_, _, err := unix.Syscall6(
Expand Down Expand Up @@ -251,9 +249,7 @@ func (u *StdConn) writeTo4(b []byte, ip netip.AddrPort) error {
var rsa unix.RawSockaddrInet4
rsa.Family = unix.AF_INET
rsa.Addr = ip.Addr().As4()
port := ip.Port()
// Little Endian -> Network Endian
rsa.Port = (port >> 8) | ((port & 0xff) << 8)
binary.BigEndian.PutUint16((*[2]byte)(unsafe.Pointer(&rsa.Port))[:], ip.Port())

for {
_, _, err := unix.Syscall6(
Expand Down
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