ef315ef3e2
* Add edns0 code rewrite * check arg count * change `new`; set EDNS0 if request doesn't have it set * change set to replace_or_append * change to append_or_replace * return error in new * update documents * fixt UT * return error * go fmt * Rework for more general EDNS0 use Also changed how rules are created and validated. Implements EDNS0 NSID in addition to local. * go fmt * README updates, NSID tests and fixes * gofmt -s -w * Fix tests for rewrite syntax change * Add tests, fix error message * Review nits * Missed on nit * More tests, integration test, fix edns0 parse issue * Fix README, use RewriteIgnored * go fmt
35 lines
817 B
Go
35 lines
817 B
Go
package rewrite
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import (
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"fmt"
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"strings"
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"github.com/miekg/dns"
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)
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type classRule struct {
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fromClass, toClass uint16
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}
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func newClassRule(fromS, toS string) (Rule, error) {
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var from, to uint16
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var ok bool
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if from, ok = dns.StringToClass[strings.ToUpper(fromS)]; !ok {
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return nil, fmt.Errorf("invalid class %q", strings.ToUpper(fromS))
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}
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if to, ok = dns.StringToClass[strings.ToUpper(toS)]; !ok {
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return nil, fmt.Errorf("invalid class %q", strings.ToUpper(toS))
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}
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return &classRule{fromClass: from, toClass: to}, nil
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}
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// Rewrite rewrites the the current request.
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func (rule *classRule) Rewrite(r *dns.Msg) Result {
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if rule.fromClass > 0 && rule.toClass > 0 {
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if r.Question[0].Qclass == rule.fromClass {
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r.Question[0].Qclass = rule.toClass
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return RewriteDone
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}
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}
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return RewriteIgnored
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}
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