64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
package webconnectivity
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import (
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"context"
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"fmt"
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"net/url"
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"sort"
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"time"
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"github.com/ooni/probe-cli/v3/internal/engine/experiment/urlgetter"
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"github.com/ooni/probe-cli/v3/internal/model"
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)
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// DNSLookupConfig contains settings for the DNS lookup.
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type DNSLookupConfig struct {
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Begin time.Time
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Session model.ExperimentSession
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URL *url.URL
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}
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// DNSLookupResult contains the result of the DNS lookup.
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type DNSLookupResult struct {
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Addrs map[string]int64
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Failure *string
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TestKeys urlgetter.TestKeys
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}
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// DNSLookup performs the DNS lookup part of Web Connectivity.
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func DNSLookup(ctx context.Context, config DNSLookupConfig) (out DNSLookupResult) {
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target := fmt.Sprintf("dnslookup://%s", config.URL.Hostname())
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config.Session.Logger().Infof("%s...", target)
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result, err := urlgetter.Getter{
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Begin: config.Begin, Session: config.Session, Target: target}.Get(ctx)
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out.Addrs = make(map[string]int64)
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for _, query := range result.Queries {
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for _, answer := range query.Answers {
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if answer.IPv4 != "" {
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out.Addrs[answer.IPv4] = answer.ASN
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continue
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}
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if answer.IPv6 != "" {
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out.Addrs[answer.IPv6] = answer.ASN
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continue
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}
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}
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}
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config.Session.Logger().Infof("%s... %+v", target, model.ErrorToStringOrOK(err))
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out.Failure = result.Failure
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out.TestKeys = result
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return
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}
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// Addresses returns the IP addresses in the DNSLookupResult
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func (r DNSLookupResult) Addresses() (out []string) {
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out = []string{}
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for addr := range r.Addrs {
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out = append(out, addr)
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}
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sort.Slice(out, func(i, j int) bool {
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return out[i] < out[j]
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})
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return
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}
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