tailcfg: rename prototype field to reflect its status

(Added earlier today in tailscale#8916, 57da1f1)

Updates tailscale/corp#13969

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

Author: bradfitz

client/tailscale/apitype/controltype.go

@@ -4,13 +4,13 @@
 package apitype
 
 type DNSConfig struct {
-	Resolvers         []DNSResolver            `json:"resolvers"`
-	FallbackResolvers []DNSResolver            `json:"fallbackResolvers"`
-	Routes            map[string][]DNSResolver `json:"routes"`
-	Domains           []string                 `json:"domains"`
-	Nameservers       []string                 `json:"nameservers"`
-	Proxied           bool                     `json:"proxied"`
-	DNSFilterURL      string                   `json:"DNSFilterURL"`
+	Resolvers          []DNSResolver            `json:"resolvers"`
+	FallbackResolvers  []DNSResolver            `json:"fallbackResolvers"`
+	Routes             map[string][]DNSResolver `json:"routes"`
+	Domains            []string                 `json:"domains"`
+	Nameservers        []string                 `json:"nameservers"`
+	Proxied            bool                     `json:"proxied"`
+	TempCorpIssue13969 string                   `json:"TempCorpIssue13969,omitempty"`
 }
 
 type DNSResolver struct {

tailcfg/tailcfg.go

@@ -1403,8 +1403,11 @@ type DNSConfig struct {
 	//
 	// Matches are case insensitive.
 	ExitNodeFilteredSet []string `json:",omitempty"`
-	// DNSFilterURL contains a user inputed URL that should have a list of domains to be blocked
-	DNSFilterURL string `json:",omitempty"`
+
+	// TempCorpIssue13969 is a temporary (2023-08-16) field for an internal hack day prototype.
+	// It contains a user inputed URL that should have a list of domains to be blocked.
+	// See https://github.com/tailscale/corp/issues/13969.
+	TempCorpIssue13969 string `json:",omitempty"`
 }
 
 // DNSRecord is an extra DNS record to add to MagicDNS.