first commit

tsparams.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+# Copyright (C) 2026 Bryan Joshua Pedini - gpl-3-or-later
+
+import subprocess
+import json
+import sys
+
+def get_tailscale_prefs():
+    """
+    Executes 'tailscale debug prefs' and returns the parsed JSON output.
+    """
+    try:
+        # Run the command and capture stdout
+        result = subprocess.run(
+            ["tailscale", "debug", "prefs"],
+            capture_output=True,
+            text=True,
+            check=True
+        )
+        return json.loads(result.stdout)
+    except FileNotFoundError:
+        print("Error: 'tailscale' command not found. Please ensure Tailscale is installed.", file=sys.stderr)
+        sys.exit(1)
+    except subprocess.CalledProcessError as e:
+        print(f"Error running 'tailscale debug prefs': {e.stderr}", file=sys.stderr)
+        sys.exit(1)
+    except json.JSONDecodeError as e:
+        print(f"Error parsing JSON output: {e}", file=sys.stderr)
+        sys.exit(1)
+
+def process_advertise_routes(routes_array, append_func):
+    """
+    Processes the AdvertiseRoutes array according to the specific logic:
+    - Separates exit node routes (0.0.0.0/0, ::/0) from standard routes.
+    - Appends '--advertise-exit-node' if exit node routes are found.
+    - Appends '--advertise-routes=' with a comma-separated list of standard routes.
+    """
+    exit_node_routes = {"0.0.0.0/0", "::/0"}
+    has_exit_node = False
+    standard_routes = []
+
+    if routes_array:
+        for route in routes_array:
+            if route in exit_node_routes:
+                has_exit_node = True
+            else:
+                standard_routes.append(route)
+
+    # If exit node routes are present, append the specific flag
+    if has_exit_node:
+        append_func("--advertise-exit-node")
+
+    # If standard routes are present, append them as a comma-separated list
+    if standard_routes:
+        routes_str = ",".join(standard_routes)
+        append_func(f"--advertise-routes={routes_str}")
+
+def main():
+    # 1. Get the JSON data from the command
+    prefs = get_tailscale_prefs()
+
+    # Initialize the main string list
+    cmd_parts = ["tailscale up"]
+
+    # Helper function to append to the main string list
+    def append_to_cmd(string_part):
+        cmd_parts.append(string_part)
+
+    # 2. Process RouteAll
+    # Default is false, so we only append if it is true
+    if prefs.get("RouteAll", False):
+        append_to_cmd("--accept-routes")
+
+    # 3. Process CorpDNS
+    # Default is true, so we only append if it is false (to set --accept-dns=false)
+    if not prefs.get("CorpDNS", True):
+        append_to_cmd("--accept-dns=false")
+
+    # 4. Process AdvertiseRoutes
+    # We use the dedicated function for the array logic
+    routes = prefs.get("AdvertiseRoutes")
+    if routes:
+        process_advertise_routes(routes, append_to_cmd)
+
+    # Output the resulting string
+    print(" ".join(cmd_parts))
+
+if __name__ == "__main__":
+    main()