If a server has a hostname that's not an IP, use it as SNI server name

src/IRCServer.py

@@ -97,7 +97,12 @@ class Server(IRCObject.Object):
         if client_certificate and client_key:
             context.load_cert_chain(client_certificate, keyfile=client_key)
 
-        self.socket = context.wrap_socket(self.socket)
+        server_hostname = None
+        if not utils.is_ip(self.connection_params.hostname):
+            server_hostname = self.connection_params.hostname
+
+        self.socket = context.wrap_socket(self.socket,
+            server_hostname=server_hostname)
 
     def connect(self):
         ipv4 = self.connection_params.ipv4

src/utils/__init__.py

@@ -1,4 +1,4 @@
-import decimal, io, re, typing
+import decimal, io, ipaddress, re, typing
 from src.utils import cli, consts, irc, http, parse
 
 TIME_SECOND = 1
@@ -179,3 +179,10 @@ class CaseInsensitiveDict(dict):
         return dict.__getitem__(self, key.lower())
     def __setitem__(self, key: str, value: typing.Any) -> typing.Any:
         return dict.__setitem__(self, key.lower(), value)
+
+def is_ip(s: str) -> bool:
+    try:
+        ipaddress.ip_address(s)
+    except ValueError:
+        return False
+    return True