v2: tabs, chain builder, obfuscation modes, hop slider, Defender exclusion, firewall kept

Made-with: Cursor

proxy_chain_manager/sysproxy.py

@@ -0,0 +1,60 @@
+"""Set / clear the Windows system-wide HTTP proxy via the registry + WinINet broadcast."""
+from __future__ import annotations
+
+import ctypes
+import logging
+import winreg
+
+log = logging.getLogger(__name__)
+
+_KEY_PATH = r"Software\Microsoft\Windows\CurrentVersion\Internet Settings"
+_SETTINGS_CHANGED = 39
+_REFRESH = 37
+
+
+def _broadcast() -> None:
+    """Tell running apps (browsers, etc.) that proxy settings changed."""
+    try:
+        inet = ctypes.windll.wininet  # type: ignore[attr-defined]
+        inet.InternetSetOptionW(0, _SETTINGS_CHANGED, 0, 0)
+        inet.InternetSetOptionW(0, _REFRESH, 0, 0)
+    except Exception:
+        pass
+
+
+def set_system_proxy(host: str, port: int, bypass: str = "localhost;127.*;10.*;192.168.*;<local>") -> None:
+    proxy = f"{host}:{port}"
+    try:
+        with winreg.OpenKey(
+            winreg.HKEY_CURRENT_USER, _KEY_PATH, 0, winreg.KEY_SET_VALUE
+        ) as key:
+            winreg.SetValueEx(key, "ProxyEnable", 0, winreg.REG_DWORD, 1)
+            winreg.SetValueEx(key, "ProxyServer", 0, winreg.REG_SZ, proxy)
+            winreg.SetValueEx(key, "ProxyOverride", 0, winreg.REG_SZ, bypass)
+        _broadcast()
+        log.info("System proxy set to %s (bypass: %s)", proxy, bypass)
+    except OSError:
+        log.exception("Failed to set system proxy")
+
+
+def clear_system_proxy() -> None:
+    try:
+        with winreg.OpenKey(
+            winreg.HKEY_CURRENT_USER, _KEY_PATH, 0, winreg.KEY_SET_VALUE
+        ) as key:
+            winreg.SetValueEx(key, "ProxyEnable", 0, winreg.REG_DWORD, 0)
+        _broadcast()
+        log.info("System proxy cleared")
+    except OSError:
+        log.exception("Failed to clear system proxy")
+
+
+def is_system_proxy_set() -> bool:
+    try:
+        with winreg.OpenKey(
+            winreg.HKEY_CURRENT_USER, _KEY_PATH, 0, winreg.KEY_QUERY_VALUE
+        ) as key:
+            val, _ = winreg.QueryValueEx(key, "ProxyEnable")
+            return val == 1
+    except OSError:
+        return False