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60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
package spf_test
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import (
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"context"
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"log"
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"log/slog"
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"net"
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"github.com/mjl-/mox/dns"
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"github.com/mjl-/mox/smtp"
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"github.com/mjl-/mox/spf"
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)
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func ExampleVerify() {
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ctx := context.Background()
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resolver := dns.StrictResolver{}
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args := spf.Args{
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// IP from SMTP session.
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RemoteIP: net.ParseIP("1.2.3.4"),
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// Based on "MAIL FROM" in SMTP session.
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MailFromLocalpart: smtp.Localpart("user"),
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MailFromDomain: dns.Domain{ASCII: "sendingdomain.example.com"},
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// From HELO/EHLO in SMTP session.
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HelloDomain: dns.IPDomain{Domain: dns.Domain{ASCII: "mx.example.com"}},
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// LocalIP and LocalHostname should be set, they may be used when evaluating macro's.
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}
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// Lookup SPF record and evaluate against IP and domain in args.
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received, domain, explanation, authentic, err := spf.Verify(ctx, slog.Default(), resolver, args)
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// received.Result is always set, regardless of err.
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switch received.Result {
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case spf.StatusNone:
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log.Printf("no useful spf result, domain probably has no spf record")
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case spf.StatusNeutral:
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log.Printf("spf has no statement on ip, with \"?\" qualifier")
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case spf.StatusPass:
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log.Printf("ip is authorized")
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case spf.StatusFail:
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log.Printf("ip is not authorized, with \"-\" qualifier")
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case spf.StatusSoftfail:
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log.Printf("ip is probably not authorized, with \"~\" qualifier, softfail")
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case spf.StatusTemperror:
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log.Printf("temporary error, possibly dns lookup failure, try again soon")
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case spf.StatusPermerror:
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log.Printf("permanent error, possibly invalid spf records, later attempts likely have the same result")
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}
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if err != nil {
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log.Printf("error: %v", err)
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}
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if explanation != "" {
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log.Printf("explanation from remote about spf result: %s", explanation)
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}
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log.Printf("result is for domain %s", domain) // mailfrom or ehlo/ehlo.
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log.Printf("dns lookups dnssec-protected: %v", authentic)
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}
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