support jython and graalpy

copyparty/tcpsrv.py

@@ -15,6 +15,7 @@ from .util import (
     E_ADDR_IN_USE,
     E_ADDR_NOT_AVAIL,
     E_UNREACH,
+    IP6ALL,
     Netdev,
     min_ex,
     sunpack,
@@ -254,6 +255,9 @@ class TcpSrv(object):
         srvs: list[socket.socket] = []
         for srv in self.srv:
             ip, port = srv.getsockname()[:2]
+            if ip == IP6ALL:
+                ip = "::"  # jython
+
             try:
                 srv.listen(self.args.nc)
                 try:
@@ -275,6 +279,8 @@ class TcpSrv(object):
                     srv.close()
                     continue
 
+                t = "\n\nERROR: could not open listening socket, probably because one of the server ports ({}) is busy on one of the requested interfaces ({}); avoid this issue by specifying a different port (-p 3939) and/or a specific interface to listen on (-i 192.168.56.1)\n"
+                self.log("tcpsrv", t.format(port, ip), 1)
                 raise
 
             bound.append((ip, port))

copyparty/util.py

@@ -56,6 +56,8 @@ E_ADDR_IN_USE = _ens("EADDRINUSE WSAEADDRINUSE")
 E_ACCESS = _ens("EACCES WSAEACCES")
 E_UNREACH = _ens("EHOSTUNREACH WSAEHOSTUNREACH ENETUNREACH WSAENETUNREACH")
 
+IP6ALL = "0:0:0:0:0:0:0:0"
+
 
 try:
     import ctypes
@@ -66,7 +68,9 @@ except:
 
 try:
     HAVE_SQLITE3 = True
-    import sqlite3  # pylint: disable=unused-import  # typechk
+    import sqlite3
+
+    assert hasattr(sqlite3, "connect")  # graalpy
 except:
     HAVE_SQLITE3 = False