Allow app to use custom socks5 and shadwosocks proxies

This PR has a couple of different purposes
    - Allow users to use socks5 local proxies with the CLI without
      having to be root nor use split-tunneling. This only works for
      OpenVPN.
    - Unify the types used by different proxy parts of the codebase,
      such as the Access Methods as well as some already existing
      OpenVPN proxy code.

This PR changes the firewall on all desktop platforms as well as changes
the routing table slightly on MacOS and Windows.
On Linux the firewall code is modified to apply the appropriate firewall
marks to all packages that go to a remote endpoint corresponding to the
remote part of a local socks5 proxy. The firewall marks will allow the
routing to be done without having to modify the routing table.
On MacOS and Windows the routing table is modified to allow packages to
go to that same endpoint to pass outside the VPN tunnel, it will
additionally punch a hole in the firewall.

The PR also migrates the settings file from version 7 to version 8 in order
to properly and neatly unify Proxy related types.

Finally it provides some slight extensions to the gRPC interface in
order to allow for control over the custom proxy settings.

2 files changed, 20 insertions, 6 deletions

diff --git a/gui/src/shared/bridge-settings-builder.ts b/gui/src/shared/bridge-settings-builder.ts
index 858bea055d..2ee5469707 100644
--- a/gui/src/shared/bridge-settings-builder.ts
+++ b/gui/src/shared/bridge-settings-builder.ts
@@ -7,11 +7,13 @@ export default class BridgeSettingsBuilder {
   public build(): BridgeSettings {
     if (this.payload.location) {
       return {
+        type: 'normal',
         normal: {
           location: this.payload.location,
           providers: this.payload.providers ?? [],
           ownership: this.payload.ownership ?? Ownership.any,
         },
+        custom: undefined,
       };
     } else {
       throw new Error('Unsupported configuration');
diff --git a/gui/src/shared/daemon-rpc-types.ts b/gui/src/shared/daemon-rpc-types.ts
index e83f9e5afc..48a4110e13 100644
--- a/gui/src/shared/daemon-rpc-types.ts
+++ b/gui/src/shared/daemon-rpc-types.ts
@@ -345,15 +345,20 @@ export interface IDnsOptions {
   };
 }
 
-export type ProxySettings = ILocalProxySettings | IRemoteProxySettings | IShadowsocksProxySettings;
+export type ProxySettings =
+  | { local: ILocalProxySettings }
+  | { remote: IRemoteProxySettings }
+  | { shadowsocks: IShadowsocksProxySettings };
 
 export interface ILocalProxySettings {
-  port: number;
-  peer: string;
+  localPort: number;
+  remoteIp: string;
+  remotePort: number;
 }
 
 export interface IRemoteProxySettings {
-  address: string;
+  ip: string;
+  port: number;
   auth?: IRemoteProxyAuth;
 }
 
@@ -363,7 +368,8 @@ export interface IRemoteProxyAuth {
 }
 
 export interface IShadowsocksProxySettings {
-  peer: string;
+  ip: string;
+  port: number;
   password: string;
   cipher: string;
 }
@@ -451,7 +457,13 @@ export interface IBridgeConstraints {
   ownership: Ownership;
 }
 
-export type BridgeSettings = { normal: IBridgeConstraints } | { custom: ProxySettings };
+export type BridgeType = 'normal' | 'custom';
+
+export interface BridgeSettings {
+  type: BridgeType;
+  normal: IBridgeConstraints;
+  custom?: ProxySettings;
+}
 
 export interface ISocketAddress {
   host: string;