invaild start byte error.

[dhje0ng]

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pexpect/spawnbase.py", line 166, in read_nonblocking
    s = os.read(self.child_fd, size)
OSError: [Errno 5] Input/output error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pexpect/expect.py", line 111, in expect_loop
    incoming = spawn.read_nonblocking(spawn.maxread, timeout)
  File "/usr/lib/python3/dist-packages/pexpect/pty_spawn.py", line 485, in read_nonblocking
    return super(spawn, self).read_nonblocking(size)
  File "/usr/lib/python3/dist-packages/pexpect/spawnbase.py", line 171, in read_nonblocking
    raise EOF('End Of File (EOF). Exception style platform.')
pexpect.exceptions.EOF: End Of File (EOF). Exception style platform.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./fat.py", line 172, in <module>
    main()
  File "./fat.py", line 167, in main
    infer_network(arch, image_id, qemu_dir)
  File "./fat.py", line 113, in infer_network
    child.expect_exact("Interfaces:", timeout=None)
  File "/usr/lib/python3/dist-packages/pexpect/spawnbase.py", line 418, in expect_exact
    return exp.expect_loop(timeout)
  File "/usr/lib/python3/dist-packages/pexpect/expect.py", line 117, in expect_loop
    return self.eof(e)
  File "/usr/lib/python3/dist-packages/pexpect/expect.py", line 63, in eof
    raise EOF(msg)
pexpect.exceptions.EOF: End Of File (EOF). Exception style platform.
<pexpect.pty_spawn.spawn object at 0x7fdaaa1052e0>
command: /home/dhjeong/research/wireless-bugbounty/firmware-analysis-toolkit/firmadyne/scripts/inferNetwork.sh
args: ['/home/dhjeong/research/wireless-bugbounty/firmware-analysis-toolkit/firmadyne/scripts/inferNetwork.sh', '1', 'mipseb']
buffer (last 100 chars): b''
before (last 100 chars): b"l)\r\nUnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 18975: invalid start byte\r\n"
after: <class 'pexpect.exceptions.EOF'>
match: None
match_index: None
exitstatus: None
flag_eof: True
pid: 33016
child_fd: 5
closed: False
timeout: 30
delimiter: <class 'pexpect.exceptions.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
searcher: searcher_string:
    0: b'Interfaces:'

Error while establishing network connection after firmware extraction. This error seems to be related to the UTF-8 codec.
I am attaching the firmware file below.

n104e_ml_12_146.zip

[extremecoders-re]

Is this the same firmware as in the other issue #70 ?

[dhje0ng]

No, it's a different firmware. I will add the firmware to the problem in #70.

[extremecoders-re]

The error is due to utf-8 codec failing to decode qemu.initial.serial.log. There are non-printable characters in that file.

Changing the line to the following in file firmadyne/scripts/makeNetwork.py will fix the issue.

data = open(infile, errors="ignore").read()

This ignores decoding errors.