added routing scripts

src/wg_builder/builder.py

@@ -16,6 +16,7 @@ random = SystemRandom()
 from io import BytesIO
 import codecs
 
+
 def genPsk() -> str:
     return b64encode(random.randbytes(32)).decode('UTF-8')
 
@@ -24,12 +25,13 @@ def build_network(input_file: Path = Path('/dev/stdin'), output_folder: Path = P
     with open(input_file) as conf:
         configuration = toml.load(conf)
 
-    if 'dns' in configuration:
-        dns = tuple(IPAddress(address) for address in configuration['dns'])
-    else:
-        dns = tuple()
+    dns = (
+        Maybe.of_nullable(configuration.get('dns'))
+        .map(lambda it: tuple(IPAddress(address) for address in it))
+        .or_else_get(tuple)
+    )
 
-    network_name = Maybe.of_nullable(configuration.get('network_name')).or_else(input_file.stem)
+    network_name = Maybe.of_nullable(configuration.get('interface_name')).or_else(input_file.stem)
     network = IPNetwork(configuration['netmask'])
     address_it = network.iter_hosts()
 
@@ -64,11 +66,24 @@ def build_network(input_file: Path = Path('/dev/stdin'), output_folder: Path = P
 
     pre_shared_keys = {(server, peer): genPsk() for peer in peers for server in servers}
 
+    def write_route_add_script(file_obj):
+        text = dedent(f"""\
+            #!/usr/bin/env sh
+            ip route add {network} dev {network_name} proto kernel scope link src {network.first} 
+        """)
+        file_obj.write(text)
+
+    def write_route_del_script(file_obj):
+        text = dedent(f"""\
+            #!/usr/bin/env sh
+            ip route del {network} dev {network_name} proto kernel scope link src {network.first} 
+        """)
+        file_obj.write(text)
 
     def write_server_conf(server, file_obj):
         text = dedent(f"""\
             [Interface]
-            Address = {server.address}
+            Address = {server.address}/{network.prefixlen}
             ListenPort = {server.port}
             PrivateKey = {str(server.private_key)}
         """)
@@ -78,7 +93,7 @@ def build_network(input_file: Path = Path('/dev/stdin'), output_folder: Path = P
 
                 [Peer]
                 PublicKey = {peer.public_key}
-                AllowedIPs = {peer.allowed_ip} 
+                AllowedIPs = {peer.allowed_ip}/32 
                 PresharedKey = {pre_shared_keys[(server, peer)]}           
             """)
             file_obj.write(text)
@@ -89,7 +104,7 @@ def build_network(input_file: Path = Path('/dev/stdin'), output_folder: Path = P
             Address = {peer.allowed_ip}/32
             PrivateKey = {str(peer.private_key)}
         """)
-        dns_config = (Maybe.of(dns)
+        dns_config = (dns
                       .filter(lambda it: len(it) > 0)
                       .map(lambda it: f'DNS = {', '.join((str(addr) for addr in it))}\n')
                       .or_else(''))
@@ -117,11 +132,33 @@ def build_network(input_file: Path = Path('/dev/stdin'), output_folder: Path = P
                     tarinfo.size = bio.tell()
                     bio.seek(0)
                     archive.addfile(tarinfo, bio)
+                with BytesIO() as bio:
+                    writer = codecs.getwriter('utf-8')(bio)
+                    write_route_add_script(writer)
+                    name = f'/etc/wireguard/{network_name}-add-routes.sh'
+                    tarinfo = TarInfo(name)
+                    tarinfo.size = bio.tell()
+                    tarinfo.mode = 0o544
+                    bio.seek(0)
+                    archive.addfile(tarinfo, bio)
+                with BytesIO() as bio:
+                    writer = codecs.getwriter('utf-8')(bio)
+                    write_route_del_script(writer)
+                    name = f'/etc/wireguard/{network_name}-del-routes.sh'
+                    tarinfo = TarInfo(name)
+                    tarinfo.size = bio.tell()
+                    tarinfo.mode = 0o544
+                    bio.seek(0)
+                    archive.addfile(tarinfo, bio)
         else:
             server_folder = output_folder / f'{server.name}'
             makedirs(server_folder, exist_ok=True)
             with (open(server_folder / f'{network_name}.conf', 'w') as f):
                 write_server_conf(server, f)
+            with (open(server_folder / f'{network_name}-add-routes.sh', 'w') as f):
+                write_route_add_script(f)
+            with (open(server_folder / f'{network_name}-del-routes.sh', 'w') as f):
+                write_route_del_script(f)
 
     for peer in peers:
         if archive:
@@ -139,5 +176,3 @@ def build_network(input_file: Path = Path('/dev/stdin'), output_folder: Path = P
             makedirs(peer_folder, exist_ok=True)
             with (open(peer_folder / f'{network_name}.conf', 'w') as f):
                 write_client_conf(peer, f)
-
-