From 060368e93dc93778e34ae44d029b5bc6ce3f3f8e Mon Sep 17 00:00:00 2001
From: ed <s@ocv.me>
Date: Fri, 1 May 2020 02:17:59 +0200
Subject: [PATCH] some boxes on 10.x.x.x/8 would crash

---
 .vscode/launch.json   |  2 +-
 copyparty/httpconn.py | 17 ++++++++++++++++-
 copyparty/tcpsrv.py   | 24 ++++++++++++++++++------
 3 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/.vscode/launch.json b/.vscode/launch.json
index f5ec519b..7aed04c2 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -15,7 +15,7 @@
                 "-a",
                 "ed:wark",
                 "-v",
-                "/home/ed/inc:inc:r:aed"
+                "srv::r:aed"
             ]
         },
         {
diff --git a/copyparty/httpconn.py b/copyparty/httpconn.py
index bca54b8f..6e4135a8 100644
--- a/copyparty/httpconn.py
+++ b/copyparty/httpconn.py
@@ -2,9 +2,24 @@
 from __future__ import print_function, unicode_literals
 
 import os
+import sys
 import ssl
 import socket
-import jinja2
+
+try:
+    import jinja2
+except ImportError:
+    print(
+        """\033[1;31m
+  you do not have jinja2 installed,\033[33m
+  choose one of these:\033[0m
+   * apt install python-jinja2
+   * python3 -m pip install --user jinja2
+   * (try another python version, if you have one)
+   * (try copyparty.sfx instead)
+"""
+    )
+    sys.exit(1)
 
 from .__init__ import E
 from .util import Unrecv
diff --git a/copyparty/tcpsrv.py b/copyparty/tcpsrv.py
index 29e5f349..9baa0d36 100644
--- a/copyparty/tcpsrv.py
+++ b/copyparty/tcpsrv.py
@@ -92,12 +92,24 @@ class TcpSrv(object):
 
         default_route = None
         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        try:
-            s.connect(("10.255.255.255", 1))
-            default_route = s.getsockname()[0]
-        except (OSError, socket.error) as ex:
-            if ex.errno not in [101, 10065]:
-                raise
+        for ip in [
+            "10.255.255.255",
+            "172.31.255.255",
+            "192.168.255.255",
+            "239.255.255.255",
+            # could add 1.1.1.1 as a final fallback
+            # but external connections is kinshi
+        ]:
+            try:
+                s.connect((ip, 1))
+                # raise OSError(13, "a")
+                default_route = s.getsockname()[0]
+                break
+            except (OSError, socket.error) as ex:
+                if ex.errno == 13:
+                    self.log("tcpsrv", "eaccess {} (trying next)".format(ip))
+                elif ex.errno not in [101, 10065]:
+                    raise
 
         s.close()