CP-53723 Implement Console timeout configure API for Dom0 SSH control

Implemented XAPI APIs:
  - `set_console_idle_timeout`

This API allow XAPI to configure timeouts for the idle console sessions.

Signed-off-by: Lunfan Zhang <[email protected]>

Author: LunfanZhang

ocaml/idl/datamodel_errors.ml

@@ -2040,6 +2040,9 @@ let _ =
   error Api_errors.disable_ssh_partially_failed ["hosts"]
     ~doc:"Some of hosts failed to disable SSH access." () ;
 
+  error Api_errors.set_console_timeout_partially_failed ["hosts"]
+    ~doc:"Some hosts failed to set console timeout." () ;
+
   error Api_errors.host_driver_no_hardware ["driver variant"]
     ~doc:"No hardware present for this host driver variant" () ;
 

ocaml/xapi-consts/api_errors.ml

@@ -1420,6 +1420,9 @@ let enable_ssh_partially_failed = add_error "ENABLE_SSH_PARTIALLY_FAILED"
 
 let disable_ssh_partially_failed = add_error "DISABLE_SSH_PARTIALLY_FAILED"
 
+let set_console_timeout_partially_failed =
+  add_error "SET_CONSOLE_TIMEOUT_PARTIALLY_FAILED"
+
 let host_driver_no_hardware = add_error "HOST_DRIVER_NO_HARDWARE"
 
 let tls_verification_not_enabled_in_pool =

ocaml/xapi/xapi_host.ml

@@ -3136,4 +3136,54 @@ let disable_ssh ~__context ~self =
 
 let set_ssh_enabled_timeout ~__context ~self:_ ~value:_ = ()
 
-let set_console_idle_timeout ~__context ~self:_ ~value:_ = ()
+let set_console_idle_timeout ~__context ~self ~value =
+  let validate_timeout = function
+    | timeout when timeout >= 0L ->
+        timeout
+    | timeout ->
+        raise
+          (Api_errors.Server_error
+             ( Api_errors.invalid_value
+             , [
+                 "console_timeout"
+               ; Int64.to_string timeout
+               ; "must be a positive integer"
+               ]
+             )
+          )
+  in
+
+  let console_timeout = validate_timeout value in
+  let bashrc = "/root/.bashrc" in
+
+  try
+    let lines = Unixext.read_lines ~path:bashrc in
+    let filtered =
+      List.filter
+        (fun line -> not (String.starts_with ~prefix:"export TMOUT=" line))
+        lines
+    in
+
+    let new_lines =
+      match console_timeout with
+      | 0L ->
+          filtered
+      | timeout ->
+          filtered @ [Printf.sprintf "export TMOUT=%Ld" timeout]
+    in
+    let content = String.concat "\n" new_lines ^ "\n" in
+
+    Unixext.atomic_write_to_file bashrc 0o0644 (fun fd ->
+        Unix.write fd (Bytes.of_string content) 0 (String.length content)
+        |> ignore
+    ) ;
+
+    Db.Host.set_console_idle_timeout ~__context ~self ~value:console_timeout
+  with e ->
+    error "Failed to configure console timeout: %s" (Printexc.to_string e) ;
+    raise
+      (Api_errors.Server_error
+         ( Api_errors.set_console_idle_timeout_failed
+         , ["Failed to configure console timeout"; Printexc.to_string e]
+         )
+      )

ocaml/xapi/xapi_pool.ml

@@ -4003,6 +4003,13 @@ module Ssh = struct
   let disable ~__context ~self:_ =
     operate ~__context ~action:Client.Host.disable_ssh
       ~error:Api_errors.disable_ssh_partially_failed
+
+  let set_console_timeout ~__context ~self:_ ~value =
+    operate ~__context
+      ~action:(fun ~rpc ~session_id ~self ->
+        Client.Host.set_console_idle_timeout ~rpc ~session_id ~self ~value
+      )
+      ~error:Api_errors.set_console_timeout_partially_failed
 end
 
 let enable_ssh = Ssh.enable
@@ -4011,4 +4018,4 @@ let disable_ssh = Ssh.disable
 
 let set_ssh_enabled_timeout ~__context ~self:_ ~value:_ = ()
 
-let set_console_idle_timeout ~__context ~self:_ ~value:_ = ()
+let set_console_idle_timeout = Ssh.set_console_timeout