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Show useful 502 message for not running/existent sandbox (#231)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| package dns | ||
|
|
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| import ( | ||
| "fmt" | ||
| "log" | ||
| "net" | ||
| "strings" | ||
| "sync" | ||
|
|
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| resolver "github.com/miekg/dns" | ||
|
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| "github.com/e2b-dev/infra/packages/shared/pkg/smap" | ||
| ) | ||
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| const ttl = 0 | ||
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| const defaultRoutingIP = "127.0.0.1" | ||
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| type DNS struct { | ||
| mu sync.Mutex | ||
| records *smap.Map[string] | ||
| } | ||
|
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| func New() *DNS { | ||
| return &DNS{ | ||
| records: smap.New[string](), | ||
| } | ||
| } | ||
|
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| func (d *DNS) Add(sandboxID, ip string) { | ||
| d.records.Insert(d.hostname(sandboxID), ip) | ||
| } | ||
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| func (d *DNS) Remove(sandboxID, ip string) { | ||
| d.records.RemoveCb(d.hostname(sandboxID), func(key string, v string, exists bool) bool { | ||
| return v == ip | ||
| }) | ||
| } | ||
|
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| func (d *DNS) get(hostname string) (string, bool) { | ||
| return d.records.Get(hostname) | ||
| } | ||
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| func (*DNS) hostname(sandboxID string) string { | ||
| return fmt.Sprintf("%s.", sandboxID) | ||
| } | ||
|
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| func (d *DNS) handleDNSRequest(w resolver.ResponseWriter, r *resolver.Msg) { | ||
| m := new(resolver.Msg) | ||
| m.SetReply(r) | ||
| m.Compress = false | ||
| m.Authoritative = true | ||
|
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| for _, q := range m.Question { | ||
| if q.Qtype == resolver.TypeA { | ||
| a := &resolver.A{ | ||
| Hdr: resolver.RR_Header{ | ||
| Name: q.Name, | ||
| Rrtype: resolver.TypeA, | ||
| Class: resolver.ClassINET, | ||
| Ttl: ttl, | ||
| }, | ||
| } | ||
|
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| sandboxID := strings.Split(q.Name, "-")[0] | ||
| ip, found := d.get(sandboxID) | ||
| if found { | ||
| a.A = net.ParseIP(ip).To4() | ||
| } else { | ||
| a.A = net.ParseIP(defaultRoutingIP).To4() | ||
| } | ||
|
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| m.Answer = append(m.Answer, a) | ||
| } | ||
| } | ||
|
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| err := w.WriteMsg(m) | ||
| if err != nil { | ||
| log.Printf("Failed to write message: %s\n", err.Error()) | ||
| } | ||
| } | ||
|
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| func (d *DNS) Start(address string, port int) error { | ||
| mux := resolver.NewServeMux() | ||
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| mux.HandleFunc(".", d.handleDNSRequest) | ||
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| server := resolver.Server{Addr: fmt.Sprintf("%s:%d", address, port), Net: "udp", Handler: mux} | ||
|
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| err := server.ListenAndServe() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to start DNS server: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } |
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