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123a76c91e
* middleware/proxy: absorb httpproxy Move the httproxy into proxy. This adds and Exchanger interface which is used to exchange the messages with the upstream. The https_google upstream will re-resolve itself and update the upstream hosts used every 300s. * Remove and add TODO
91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
package proxy
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import (
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"fmt"
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"github.com/miekg/dns"
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)
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// toMsg converts a googleMsg into the dns message. The returned RR is the comment disquised as a TXT record.
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func toMsg(g *googleMsg) (*dns.Msg, dns.RR, error) {
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m := new(dns.Msg)
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m.Response = true
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m.Rcode = g.Status
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m.Truncated = g.TC
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m.RecursionDesired = g.RD
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m.RecursionAvailable = g.RA
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m.AuthenticatedData = g.AD
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m.CheckingDisabled = g.CD
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m.Question = make([]dns.Question, 1)
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m.Answer = make([]dns.RR, len(g.Answer))
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m.Ns = make([]dns.RR, len(g.Authority))
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m.Extra = make([]dns.RR, len(g.Additional))
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m.Question[0] = dns.Question{Name: g.Question[0].Name, Qtype: g.Question[0].Type, Qclass: dns.ClassINET}
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var err error
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for i := 0; i < len(m.Answer); i++ {
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m.Answer[i], err = toRR(g.Answer[i])
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if err != nil {
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return nil, nil, err
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}
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}
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for i := 0; i < len(m.Ns); i++ {
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m.Ns[i], err = toRR(g.Authority[i])
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if err != nil {
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return nil, nil, err
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}
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}
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for i := 0; i < len(m.Extra); i++ {
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m.Extra[i], err = toRR(g.Additional[i])
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if err != nil {
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return nil, nil, err
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}
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}
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txt, _ := dns.NewRR(". 0 CH TXT " + g.Comment)
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return m, txt, nil
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}
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// toRR transforms a "google" RR to a dns.RR.
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func toRR(g googleRR) (dns.RR, error) {
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typ, ok := dns.TypeToString[g.Type]
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if !ok {
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return nil, fmt.Errorf("failed to convert type %q", g.Type)
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}
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str := fmt.Sprintf("%s %d %s %s", g.Name, g.TTL, typ, g.Data)
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rr, err := dns.NewRR(str)
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if err != nil {
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return nil, fmt.Errorf("failed to parse %q: %s", str, err)
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}
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return rr, nil
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}
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// googleRR represents a dns.RR in another form.
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type googleRR struct {
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Name string
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Type uint16
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TTL uint32
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Data string
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}
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// googleMsg is a JSON representation of the dns.Msg.
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type googleMsg struct {
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Status int
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TC bool
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RD bool
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RA bool
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AD bool
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CD bool
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Question []struct {
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Name string
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Type uint16
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}
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Answer []googleRR
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Authority []googleRR
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Additional []googleRR
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Comment string
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}
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