spandspflow2pcap Namespace Reference

Data Structures
class	FaxPcap
class	SkipPacket
class	SpandspLog

Functions
	main (logname, pcapname)
	n2b (text)

Variables
bool	EMPTY_RECOVERY = False
	IFP = namedtuple('IFP', 'date seqno data')
bool	LOSSY = False

Detailed Description

Usage: ./spandspflow2pcap.py SPANDSP_LOG SENDFAX_PCAP

Takes a log from Asterisk with SpanDSP, extracts the "received" data
and puts it in a pcap file. Use 'fax set debug on' and configure
logger.conf to get fax logs.

Input data should look something like this::

    [2013-08-07 15:17:34] FAX[23479] res_fax.c: FLOW T.38 Rx     5: IFP c0 ...

Output data will look like a valid pcap file ;-)

This allows you to reconstruct received faxes into replayable pcaps.

Replaying is expected to be done by SIPp with sipp-sendfax.xml. The
SIPp binary used for replaying must have image (fax) support. This means
you'll need a version higher than 3.5.0 (unreleased when writing this),
or the git master branch: https://github.com/SIPp/sipp


Author: Walter Doekes, OSSO B.V. (2013,2015,2016,2019)
License: Public Domain

Function Documentation

main()

main	(		logname,
			pcapname
	)

Definition at line 239 of file spandspflow2pcap.py.

def main(logname, pcapname):
    with open(sys.argv[1], 'r') as infile:
        log = SpandspLog(infile)
 
        # with open(sys.argv[2], 'xb') as outfile:  # py3 exclusive write, bin
        create_or_fail = os.O_CREAT | os.O_EXCL | os.O_WRONLY
        try:
            fd = os.open(sys.argv[2], create_or_fail, 0o600)
        except Exception:
            raise
        else:
            with os.fdopen(fd, 'wb') as outfile:
                pcap = FaxPcap(outfile)
                for data in log:
                    pcap.add(data)
 
 

References len(), and main().

n2b()

n2b

(

text

)

Convert "aa bb cc" to bytearray('\xaa\xbb\xcc').

Definition at line 44 of file spandspflow2pcap.py.

def n2b(text):
    """
    Convert "aa bb cc" to bytearray('\xaa\xbb\xcc').
    """
    return bytearray(
        b16decode(text.replace(' ', '').replace('\n', '').upper()))
 
 

References replace().

Referenced by SpandspLog.__iter__().

Variable Documentation

EMPTY_RECOVERY

bool EMPTY_RECOVERY = False

Definition at line 38 of file spandspflow2pcap.py.

IFP

IFP = namedtuple('IFP', 'date seqno data')

Definition at line 41 of file spandspflow2pcap.py.

Referenced by SpandspLog.__iter__(), and FaxPcap.add().

LOSSY

bool LOSSY = False

Definition at line 37 of file spandspflow2pcap.py.