fix: bad file descriptor error in windows, fix pytest errors

hack/exec-tool

@@ -24,7 +24,7 @@ ping)
     ;;
 iperf3)
     port=5001
-    with_set_x exec iperf3 --client "$ip" --port=$port --connect-timeout=$connect_timeout_sec "$@"
+    with_set_x exec iperf3 --client "$ip" --port=$port --connect-timeout=$((connect_timeout_sec * 1000)) "$@"
     ;;
 curl)
     port=8080

hack/run-checks

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+set -e
+cd "$(dirname "$0")/.."
+
+export PYTHONPATH=.
+
+set -x
+python -m pytest .
+python -m flake8 .  

sshuttle/firewall.py

@@ -224,7 +224,6 @@ def main(method_name, syslog):
     stdout.write(('READY %s\n' % method.name).encode('ASCII'))
     stdout.flush()
 
-
     def _read_next_string_line():
         try:
             line = stdin.readline(128)

sshuttle/ssnet.py

@@ -432,7 +432,8 @@ class Mux(Handler):
     def flush(self):
         set_non_blocking_io(self.wfile.fileno())
         if self.outbuf and self.outbuf[0]:
-            wrote = _nb_clean(os.write, self.wfile.fileno(), self.outbuf[0])
+            wrote = _nb_clean(self.wfile.write, self.outbuf[0])
+            self.wfile.flush()
             debug2('mux wrote: %r/%d' % (wrote, len(self.outbuf[0])))
             if wrote:
                 self.outbuf[0] = self.outbuf[0][wrote:]

tests/client/test_firewall.py

@@ -21,7 +21,7 @@ NSLIST
 PORTS 1024,1025,1026,1027
 GO 1 - - 0x01 12345
 HOST 1.2.3.3,existing
-""".format(inet=AF_INET, inet6=AF_INET6))
+""".format(inet=AF_INET, inet6=AF_INET6).encode('ASCII'))
     stdout = Mock()
     return stdin, stdout