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tailcfg, control/controlclient, ipn/ipnlocal: add c2n (control-to-node) system

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This lets the control plane can make HTTP requests to nodes.

Then we can use this for future things rather than slapping more stuff
into MapResponse, etc.

Change-Id: Ic802078c50d33653ae1f79d1e5257e7ade4408fd
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-08-27 12:55:41 -07:00
committed by Brad Fitzpatrick
parent 08b3f5f070
commit c66f99fcdc
6 changed files with 176 additions and 8 deletions
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26
tailcfg/tailcfg.go
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@@ -1155,12 +1155,15 @@ const (
// PingRequest with Types and IP, will send a ping to the IP and send a POST
// request containing a PingResponse to the URL containing results.
type PingRequest struct {
// URL is the URL to send a HEAD request to.
// URL is the URL to reply to the PingRequest to.
// It will be a unique URL each time. No auth headers are necessary.
//
// If the client sees multiple PingRequests with the same URL,
// subsequent ones should be ignored.
// If Types and IP are defined, then URL is the URL to send a POST request to.
//
// The HTTP method that the node should make back to URL depends on the other
// fields of the PingRequest. If Types is defined, then URL is the URL to
// send a POST request to. Otherwise, the node should just make a HEAD
// request to URL.
URL string
// URLIsNoise, if true, means that the client should hit URL over the Noise
@@ -1173,11 +1176,22 @@ type PingRequest struct {
// Types is the types of ping that are initiated. Can be any PingType, comma
// separated, e.g. "disco,TSMP"
Types string
//
// As a special case, if Types is "c2n", then this PingRequest is a
// client-to-node HTTP request. The HTTP request should be handled by this
// node's c2n handler and the HTTP response sent in a POST to URL. For c2n,
// the value of URLIsNoise is ignored and only the Noise transport (back to
// the control plane) will be used, as if URLIsNoise were true.
Types string `json:",omitempty"`
// IP is the ping target.
// It is used in TSMP pings, if IP is invalid or empty then do a HEAD request to the URL.
// IP is the ping target, when needed by the PingType(s) given in Types.
IP netip.Addr
// Payload is the ping payload.
//
// It is only used for c2n requests, in which case it's an HTTP/1.0 or
// HTTP/1.1-formatted HTTP request as parsable with http.ReadRequest.
Payload []byte `json:",omitempty"`
}
// PingResponse provides result information for a TSMP or Disco PingRequest.