73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/julienschmidt/httprouter"
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"github.com/miekg/dns"
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"git.nemunai.re/srs/adlin/libadlin"
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)
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type checkGLUE struct {
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Domain string `json:"domain"`
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IP string `json:"ip"`
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}
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func init() {
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router.POST("/api/check/GLUE", apiAuthHandler(func(student *adlin.Student, ps httprouter.Params, body []byte) (interface{}, error) {
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var uc checkGLUE
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if err := json.Unmarshal(body, &uc); err != nil {
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return nil, err
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}
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return true, check_GLUE_respond(student, uc.Domain, uc.IP)
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}))
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}
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func check_GLUE_respond(student *adlin.Student, domain string, ip string) (err error) {
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if !strings.HasPrefix(ip, adlin.StudentIP(student.Id, 0).String()) {
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return fmt.Errorf("%q is not your IP range", ip)
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}
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client := dns.Client{Net: "tcp", Timeout: time.Second * 5}
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m := new(dns.Msg)
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m.SetQuestion(domain, dns.TypeAAAA)
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m.RecursionDesired = false
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m.SetEdns0(4096, true)
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var r *dns.Msg
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r, _, err = client.Exchange(m, fmt.Sprintf("[%s]:53", ip))
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if err != nil {
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return
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}
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if r == nil {
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return errors.New("Response from name server is nil")
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}
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if r.Rcode != dns.RcodeSuccess {
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return fmt.Errorf("Name server returns %s", dns.RcodeToString[r.Rcode])
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}
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if len(r.Answer) == 0 {
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return errors.New("Empty response for this NS record")
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}
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found := false
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for _, answer := range r.Answer {
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if t, ok := answer.(*dns.AAAA); ok {
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found = found || t.AAAA.String() == ip
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}
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}
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if !found {
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return fmt.Errorf("%q not found in records", ip)
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}
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return
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}
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