fix crash triggered by port scans closing socket

sshuttle/methods/pf.py

@@ -3,6 +3,7 @@ import sys
 import platform
 import re
 import socket
+import errno
 import struct
 import subprocess as ssubprocess
 import shlex
@@ -423,7 +424,14 @@ class Method(BaseMethod):
     def get_tcp_dstip(self, sock):
         pfile = self.firewall.pfile
 
+        try:
             peer = sock.getpeername()
+        except socket.error:
+            _, e = sys.exc_info()[:2]
+            if e.args[0] == errno.EINVAL:
+                debug2("get_tcp_dstip error: sock.getpeername() %s\nsocket is probably closed.\n" % e)
+                return sock.getsockname()
+
         proxy = sock.getsockname()
 
         argv = (sock.family, socket.IPPROTO_TCP,

sshuttle/ssnet.py

@@ -96,7 +96,10 @@ def _try_peername(sock):
             return '%s:%s' % (pn[0], pn[1])
     except socket.error:
         _, e = sys.exc_info()[:2]
-        if e.args[0] not in (errno.ENOTCONN, errno.ENOTSOCK):
+        if e.args[0] == errno.EINVAL:
+            debug2("_try_peername error: sock.getpeername() %s\nsocket is probably closed.\n" % e)
+            pass
+        elif e.args[0] not in (errno.ENOTCONN, errno.ENOTSOCK):
             raise
     except AttributeError:
         pass