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Code Issues Releases Activity

SPF Optimizer: Add "redirect:" support (#506)

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FYI: The support is very minimal. It only supports redirect if it is the last item in an SPF record. At that point, it is equivalent to include.

* In SFP, treat redirect like a special include.
* Document SPF redirect: limited implementation.
This commit is contained in:
Tom Limoncelli
2019-06-19 18:46:56 +01:00
committed by GitHub
parent 4a7a5515a0
commit 2d9d93653b
3 changed files with 44 additions and 3 deletions
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15
pkg/spflib/parse.go
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@@ -52,7 +52,7 @@ func Parse(text string, dnsres Resolver) (*SPFRecord, error) {
}
parts := strings.Split(text, " ")
rec := &SPFRecord{}
for _, part := range parts[1:] {
for pi, part := range parts[1:] {
if part == "" {
continue
}
@@ -69,9 +69,18 @@ func Parse(text string, dnsres Resolver) (*SPFRecord, error) {
} else if strings.HasPrefix(part, "ip4:") || strings.HasPrefix(part, "ip6:") {
// ip address, 0 lookups
continue
} else if strings.HasPrefix(part, "include:") {
} else if strings.HasPrefix(part, "include:") || strings.HasPrefix(part, "redirect:") {
if strings.HasPrefix(part, "redirect:") {
// pi + 2: because pi starts at 0 when it iterates starting on parts[1],
// and because len(parts) is one bigger than the highest index.
if (pi + 2) != len(parts) {
return nil, errors.Errorf("%s must be last item", part)
}
p.IncludeDomain = strings.TrimPrefix(part, "redirect:")
} else {
p.IncludeDomain = strings.TrimPrefix(part, "include:")
}
p.IsLookup = true
p.IncludeDomain = strings.TrimPrefix(part, "include:")
if dnsres != nil {
subRecord, err := dnsres.GetSPF(p.IncludeDomain)
if err != nil {