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padding.go
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padding.go
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package ss2022
import (
"fmt"
"github.com/database64128/shadowsocks-go/conn"
)
// PaddingPolicy is a function that takes the target address and
// returns whether padding should be added.
type PaddingPolicy func(targetAddr conn.Addr) (shouldPad bool)
// NoPadding is a PaddingPolicy that never adds padding.
func NoPadding(_ conn.Addr) bool {
return false
}
// PadAll is a PaddingPolicy that adds padding to all traffic.
func PadAll(_ conn.Addr) bool {
return true
}
// PadPlainDNS is a PaddingPolicy that adds padding to plain DNS traffic.
func PadPlainDNS(targetAddr conn.Addr) bool {
return targetAddr.Port() == 53
}
// ParsePaddingPolicy parses a string representation of a PaddingPolicy.
func ParsePaddingPolicy(paddingPolicy string) (PaddingPolicy, error) {
switch paddingPolicy {
case "NoPadding":
return NoPadding, nil
case "PadAll":
return PadAll, nil
case "PadPlainDNS", "":
return PadPlainDNS, nil
default:
return nil, fmt.Errorf("invalid padding policy: %s", paddingPolicy)
}
}