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all: preserve DNS settings when running "ctrld restart"

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By attempting to reset DNS before starting new ctrld process. This way,
ctrld will read the correct system DNS settings before changing itself.

While at it, some optimizations are made:

 - "ctrld start" won't set DNS anymore, since "ctrld run" has already did
   this, start command could just query socket control server and emittin
   proper message to users.

 - The gateway won't be included as nameservers on Windows anymore,
   since the GetAdaptersAddresses Windows API always returns the correct
   DNS servers of the interfaces.

 - The nameservers list that OS resolver is using will be shown during
   ctrld startup, making it easier for debugging.
This commit is contained in:
Cuong Manh Le
2024-05-21 17:08:18 +07:00
committed by Cuong Manh Le
parent f3dd344026
commit 96085147ff
5 changed files with 64 additions and 8 deletions
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resolver.go
+5 -1
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@@ -32,8 +32,12 @@ const (
const bootstrapDNS = "76.76.2.22"
// OsNameservers is the list of DNS nameservers used by OS resolver.
// This reads OS settings at the time ctrld process starts.
var OsNameservers = defaultNameservers()
// or is the Resolver used for ResolverTypeOS.
var or = &osResolver{nameservers: defaultNameservers()}
var or = &osResolver{nameservers: OsNameservers}
// defaultNameservers returns OS nameservers plus ctrld bootstrap nameserver.
func defaultNameservers() []string {