No exception handling when there's no open port

[Chan9390]

Hey @MyKings,

This is a great python wrapper for masscan. But I found an issue when using this.
When I scan a host without any open port I get an exception. It would be better to handle it rather than raising an exception.

Code:

import masscan

mas = masscan.PortScanner()
mas.scan('127.0.0.1', ports='1-65535')

Exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/masscan/masscan.py", line 312, in scan
    masscan_warn_keep_trace=masscan_warn_keep_trace
  File "/usr/local/lib/python2.7/dist-packages/masscan/masscan.py", line 369, in analyse_masscan_xml_scan
    raise PortScannerError(masscan_err)
masscan.masscan.PortScannerError: u'\nStarting masscan 1.0.6 (http://bit.ly/14GZzcT) at 2018-05-27 13:57:06 GMT\n -- forced options: -sS -Pn -n --randomize-hosts -v --send-eth\nInitiating SYN Stealth Scan\nScanning 1 hosts [65535 ports/host]\nrate:  0.00-kpps,  0.00% done,   0:00:00 remaining, found=0       \rrate:  9.99-kpps, 10.76% done,   0:00:49 remaining, found=0       \rrate:  9.98-kpps, 22.69% done,   0:00:20 remaining, found=0       \rrate:  9.98-kpps, 34.41% done,   0:00:11 remaining, found=0       \rrate:  9.94-kpps, 45.85% done,   0:00:07 remaining, found=0       \rrate:  9.97-kpps, 56.86% done,   0:00:04 remaining, found=0       \rrate:  9.97-kpps, 68.61% done,   0:00:02 remaining, found=0       \rrate:  9.95-kpps, 80.49% done,   0:00:01 remaining, found=0       \rrate:  9.94-kpps, 91.36% done,   0:00:00 remaining, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 0-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 10-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 10-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 9-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 9-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 9-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 9-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 8-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 8-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 8-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 8-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 7-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 7-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 7-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 7-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 6-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 6-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 6-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 6-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 5-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 5-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 5-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 5-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 4-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 4-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 4-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 4-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 3-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 3-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 3-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 3-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 2-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 2-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 2-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 2-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 1-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 1-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 1-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 1-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 0-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 0-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 0-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting 0-secs, found=0       \rrate:  0.00-kpps, 100.00% done, waiting -1-secs, found=0       \r                                                                             \r'

(Note: My system doesn't have any open port)

Waiting for your response :)

[MyKings]

ok, I will solve this problem at the next milestone :)

[Chan9390]

Waiting for your update

[Chan9390]

Hey @MyKings , the issue here is that ports are not open. Its not host not found.

[MyKings]

Well, it doesn't really matter if the host is not alive or the port is not open.
I have reservations about throwing NetworkConnectionError.
But I plan not to make any changes recently, so reopen this issue.

[myme5261314]

Seems solved. If all host down (via ping) or all host/port not found, will throw the NetworkConnectionError Exception, just need to try/catch it now.

[Chan9390]

I have made changes to my tool's workflow. Closing the issue.