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cb932ca231
* Move functions from pkg/transport to pkg/parse Although "parse" is a fairly generic name I believe this is somewhat better named. pkg/transport keeps a few constants that are uses throughout for the rest is is renaming a bunch (and the fallout from there to make things compile again). Signed-off-by: Miek Gieben <miek@miek.nl> * Fix tests Signed-off-by: Miek Gieben <miek@miek.nl>
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
// Package upstream abstracts a upstream lookups so that plugins
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// can handle them in an unified way.
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package upstream
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import (
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"github.com/miekg/dns"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/plugin/pkg/nonwriter"
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"github.com/coredns/coredns/plugin/pkg/parse"
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"github.com/coredns/coredns/plugin/proxy"
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"github.com/coredns/coredns/request"
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)
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// Upstream is used to resolve CNAME targets
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type Upstream struct {
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self bool
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Forward *proxy.Proxy
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}
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// New creates a new Upstream for given destination(s). If dests is empty it default to upstreaming to
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// the coredns process.
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func New(dests []string) (Upstream, error) {
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u := Upstream{}
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if len(dests) == 0 {
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u.self = true
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return u, nil
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}
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u.self = false
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ups, err := parse.HostPortOrFile(dests...)
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if err != nil {
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return u, err
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}
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p := proxy.NewLookup(ups)
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u.Forward = &p
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return u, nil
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}
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// Lookup routes lookups to our selves or forward to a remote.
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func (u Upstream) Lookup(state request.Request, name string, typ uint16) (*dns.Msg, error) {
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if u.self {
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req := new(dns.Msg)
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req.SetQuestion(name, typ)
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nw := nonwriter.New(state.W)
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server := state.Context.Value(dnsserver.Key{}).(*dnsserver.Server)
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server.ServeDNS(state.Context, nw, req)
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return nw.Msg, nil
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}
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if u.Forward != nil {
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return u.Forward.Lookup(state, name, typ)
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}
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return nil, nil
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}
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