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tailcfg, ipn/ipnlocal: advertise a Service when exit node DNS proxy available

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Updates #1713

Change-Id: I20c8e2ad1062d82ef17363414e372133f4c7181e
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-11-29 17:19:17 -08:00
committed by Brad Fitzpatrick
parent 6e584ffa33
commit b811a316bc
2 changed files with 51 additions and 10 deletions
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43
tailcfg/tailcfg.go
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@@ -379,18 +379,49 @@ func (h *Hostinfo) CheckRequestTags() error {
return nil
}
// ServiceProto is a service type. It's usually
// TCP ("tcp") or UDP ("udp"), but it can also have
// meta service values as defined in Service.Proto.
type ServiceProto string
const (
TCP = ServiceProto("tcp")
UDP = ServiceProto("udp")
TCP = ServiceProto("tcp")
UDP = ServiceProto("udp")
PeerAPI4 = ServiceProto("peerapi4")
PeerAPI6 = ServiceProto("peerapi6")
PeerAPIDNS = ServiceProto("peerapi-dns-proxy")
)
// Service represents a service running on a node.
type Service struct {
_ structs.Incomparable
Proto ServiceProto // TCP or UDP
Port uint16 // port number service is listening on
Description string `json:",omitempty"` // text description of service
_ structs.Incomparable
// Proto is the type of service. It's usually the constant TCP
// or UDP ("tcp" or "udp"), but it can also be one of the
// following meta service values:
//
// * "peerapi4": peerapi is available on IPv4; Port is the
// port number that the peerapi is running on the
// node's Tailscale IPv4 address.
// * "peerapi6": peerapi is available on IPv6; Port is the
// port number that the peerapi is running on the
// node's Tailscale IPv6 address.
// * "peerapi-dns": the local peerapi service supports
// being a DNS proxy (when the node is an exit
// node). For this service, the Port number is really
// the version number of the service.
Proto ServiceProto
// Port is the port number.
//
// For Proto "peerapi-dns", it's the version number of the DNS proxy,
// currently 1.
Port uint16
// Description is the textual description of the service,
// usually the process name that's running.
Description string `json:",omitempty"`
// TODO(apenwarr): allow advertising services on subnet IPs?
// TODO(apenwarr): add "tags" here for each service?
}