Not working with PiHole install in Proxmox/Ubuntu container installation

[scoopdreams]

Hi there!

Thanks for this, it's really useful for a bird-eye's view on the status of connected devices.

However it does not seem to work on a PiHole installation (DHCP server is my Mikrotik router) inside a Proxmox container running Ubuntu 18.04. Seems like there's some issue with the arp-scan routines.

sudo python3 ~/pialert/back/pialert.py 1

Pi.Alert 2.70 (2021-02-01)
---------------------------------------------------------
Scan Devices
    ScanCycle: 1
    Timestamp: 2021-03-29 14:09:00

Scanning...
    arp-scan Method...
Traceback (most recent call last):
  File "/root/pialert/back/pialert.py", line 1441, in <module>
    sys.exit(main())       
  File "/root/pialert/back/pialert.py", line 85, in main
    res = scan_network()
  File "/root/pialert/back/pialert.py", line 359, in scan_network
    arpscan_devices = execute_arpscan (arpscan_retries)
  File "/root/pialert/back/pialert.py", line 456, in execute_arpscan
    arpscan_output = subprocess.check_output (arpscan_args, universal_newlines=True)
  File "/usr/lib/python3.6/subprocess.py", line 356, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.6/subprocess.py", line 425, in run
    stdout, stderr = process.communicate(input, timeout=timeout)
  File "/usr/lib/python3.6/subprocess.py", line 850, in communicate
    stdout = self.stdout.read()
  File "/usr/lib/python3.6/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xa0 in position 715: ordinal not in range(128)

Just feedback for your consideration - hope you manage to get this resolved! Looking forward to using it.

[pucherot]

Probably you are using a 7 bit charset.

Check the values of the locale command

And set an 8-bit charset for the user that executes Pi.Alert, for example export LANG=en_US.UTF-8

Perhaps you need to reconfigure locale package:

sudo locale-gen "en_US.UTF-8"
sudo dpkg-reconfigure locales

In next version I will try to force charset in Pi.Alert python script:

import sys
reload(sys)
sys.setdefaultencoding('utf-8')

[scoopdreams]

Thanks for this. I've tried reconfigured my locales (along with a reboot), to

$ locale

LANG=en_US.UTF-8
LANGUAGE=
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

$ localectl status

System Locale: LANG=en_US.UTF-8
VC Keymap: n/a
X11 Layout: us
X11 Model: pc105

ARP scan is verified working

$ arp-scan --localnet

Interface: eth0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.9 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/)
192.168.1.1     xx:xx:xx:xx:xx:xx     Routerboard.com
192.168.1.3     xx:xx:xx:xx:xx:xx       Elitegroup Computer Systems Co.,Ltd.
192.168.1.5     xx:xx:xx:xx:xx:xx       (Unknown)
192.168.1.8     xx:xx:xx:xx:xx:xx       (Unknown)
192.168.1.9    xx:xx:xx:xx:xx:xx       (Unknown)
192.168.1.10    xx:xx:xx:xx:xx:xx       Mellanox Technologies, Inc.
...

Still having the issue albeit with at line 321 instead of 25.

$ python3 ~/pialert/back/pialert.py 1

Pi.Alert 2.70 (2021-02-01)
---------------------------------------------------------
Scan Devices
    ScanCycle: 1
    Timestamp: 2021-04-19 07:20:00

Scanning...
    arp-scan Method...
Traceback (most recent call last):
  File "/root/pialert/back/pialert.py", line 1441, in <module>
    sys.exit(main())       
  File "/root/pialert/back/pialert.py", line 85, in main
    res = scan_network()
  File "/root/pialert/back/pialert.py", line 359, in scan_network
    arpscan_devices = execute_arpscan (arpscan_retries)
  File "/root/pialert/back/pialert.py", line 456, in execute_arpscan
    arpscan_output = subprocess.check_output (arpscan_args, universal_newlines=True)
  File "/usr/lib/python3.6/subprocess.py", line 356, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.6/subprocess.py", line 425, in run
    stdout, stderr = process.communicate(input, timeout=timeout)
  File "/usr/lib/python3.6/subprocess.py", line 850, in communicate
    stdout = self.stdout.read()
  File "/usr/lib/python3.6/codecs.py", line 321, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa0 in position 647: invalid start byte