frp/vendor/github.com/armon/go-socks5/ruleset.go

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2017-07-01 16:09:09 +08:00
package socks5
import (
"golang.org/x/net/context"
)
// RuleSet is used to provide custom rules to allow or prohibit actions
type RuleSet interface {
Allow(ctx context.Context, req *Request) (context.Context, bool)
}
// PermitAll returns a RuleSet which allows all types of connections
func PermitAll() RuleSet {
return &PermitCommand{true, true, true}
}
// PermitNone returns a RuleSet which disallows all types of connections
func PermitNone() RuleSet {
return &PermitCommand{false, false, false}
}
// PermitCommand is an implementation of the RuleSet which
// enables filtering supported commands
type PermitCommand struct {
EnableConnect bool
EnableBind bool
EnableAssociate bool
}
func (p *PermitCommand) Allow(ctx context.Context, req *Request) (context.Context, bool) {
switch req.Command {
case ConnectCommand:
return ctx, p.EnableConnect
case BindCommand:
return ctx, p.EnableBind
case AssociateCommand:
return ctx, p.EnableAssociate
}
return ctx, false
}