69 lines
2.0 KiB
Go
69 lines
2.0 KiB
Go
// Copyright 2015 ISRG. All rights reserved
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package bdns
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import (
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"fmt"
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"net"
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"github.com/letsencrypt/boulder/Godeps/_workspace/src/github.com/miekg/dns"
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"github.com/letsencrypt/boulder/Godeps/_workspace/src/golang.org/x/net/context"
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"github.com/letsencrypt/boulder/probs"
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)
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type dnsError struct {
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recordType uint16
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hostname string
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// Exactly one of rCode or underlying should be set.
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underlying error
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rCode int
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}
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func (d dnsError) Error() string {
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var detail string
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if d.underlying != nil {
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if netErr, ok := d.underlying.(*net.OpError); ok {
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if netErr.Timeout() {
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detail = detailDNSTimeout
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} else {
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detail = detailDNSNetFailure
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}
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} else if d.underlying == context.Canceled || d.underlying == context.DeadlineExceeded {
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detail = detailDNSTimeout
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} else {
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detail = detailServerFailure
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}
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} else if d.rCode != dns.RcodeSuccess {
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detail = dns.RcodeToString[d.rCode]
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} else {
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detail = detailServerFailure
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}
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return fmt.Sprintf("DNS problem: %s looking up %s for %s", detail,
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dns.TypeToString[d.recordType], d.hostname)
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}
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const detailDNSTimeout = "query timed out"
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const detailDNSNetFailure = "networking error"
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const detailServerFailure = "server failure at resolver"
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// ProblemDetailsFromDNSError checks the error returned from Lookup... methods
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// and tests if the error was an underlying net.OpError or an error caused by
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// resolver returning SERVFAIL or other invalid Rcodes and returns the relevant
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// core.ProblemDetails. The detail string will contain a mention of the DNS
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// record type and domain given.
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func ProblemDetailsFromDNSError(err error) *probs.ProblemDetails {
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if dnsErr, ok := err.(*dnsError); ok {
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return &probs.ProblemDetails{
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Type: probs.ConnectionProblem,
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Detail: dnsErr.Error(),
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}
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}
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return &probs.ProblemDetails{
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Type: probs.ConnectionProblem,
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Detail: detailServerFailure,
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}
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}
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