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#! /bin/env python
# -*- Mode: python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details:
#
# Copyright (C) 2012 Red Hat, Inc.
#
import os
import sys
import select
import struct
import string
from termios import *
debug = False
def lg_pack(data, seqno):
l = len(data)
fmt = "<"
fmt += "I" # magic
fmt += "I" # sequence number
fmt += "I" # data length
fmt += "H" # MUX channel
fmt += "%ds" % l # AT data
# Packets always padded to 4-byte boundaries
sz = struct.calcsize(fmt)
padding = 0
if sz % 4 > 0:
padding = 4 - (sz % 4)
fmt += "%ds" % padding
return struct.pack(fmt, 0xa512485a, seqno, l, 0xf011, data, "\0" * padding)
def lg_unpack(data):
fmt = "<"
fmt += "I" # magic
fmt += "I" # sequence number
fmt += "I" # data length
fmt += "H" # MUX channel
fmt += "%ds" % (len(data) - 14) # AT data
(magic, seq, l, chan, resp) = struct.unpack(fmt, data)
if magic != 0xa512485a:
raise Exception("Bad magic: 0x%08x" % magic)
if chan != 0xf011:
print "Unhandled channel 0x%04x" % chan
# It appears that we're supposed to ignore any data after \r\n, or if
# we don't get a \r\n we ignore all of it. The modem adds random
# data to the end of the response, for example:
#
# > 5a 48 12 a5 08 00 00 00 0a 00 00 00 11 f0 41 54 2b 43 45 52 45 47 3f 0a
# < 5a 48 12 a5 4e 00 00 00 15 00 00 00 11 f0 2b 43 45 52 45 47 3a 20 30 2c 31 0d 0a 00 00 4f 4b 0d 0a 00 47 74
#
# where there's a trailing "00 47 74". The trailing bytes appear
# totally random in value and length.
crlf = resp.rfind("\r\n")
if crlf == -1:
return ""
return resp[:crlf + 2]
def dump_raw(data, to_modem):
if debug:
line = ""
if to_modem:
line += "> "
else:
line += "< "
for c in data:
line += "%02x " % ord(c)
print line
def make_printable(data):
p = ""
for c in data:
if c in string.printable and ord(c) >= 32 or c == '\n' or c == '\r':
p += c
else:
p += "<%2x>" % ord(c)
return p
#########################################
if len(sys.argv) != 2 and len(sys.argv) != 3:
print "Usage: %s <port> [--debug]" % sys.argv[0]
sys.exit(1)
if len(sys.argv) > 2 and sys.argv[2] == "--debug":
debug = True
fd = os.open(sys.argv[1], os.O_RDWR)
# read existing port attributes and mask the ones we don't want
attrs = tcgetattr(fd)
attrs[0] = attrs[0] & ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON) # iflag
attrs[1] = attrs[1] & ~OPOST # oflag
attrs[2] = attrs[2] & ~(CSIZE | PARENB) # cflag
attrs[3] = attrs[3] & ~(ECHO | ICANON | IEXTEN | ISIG) # lflag
# Set up the attributes we do want
attrs[2] = attrs[2] | CS8 # cflag
attrs[4] = B115200 # ispeed
attrs[5] = B115200 # ospeed
attrs[6][VMIN] = 1 # cc
attrs[6][VTIME] = 0 # cc
tcsetattr(fd, TCSAFLUSH, attrs)
infd = sys.stdin.fileno()
seqno = 0
while 1:
try:
rfd, wfd, xfd = select.select([ fd, infd ], [], [])
except KeyboardInterrupt:
print ""
break
if fd in rfd:
data = os.read(fd, 4096)
dump_raw(data, False)
line = lg_unpack(data)
if line:
print make_printable(line)
if infd in rfd:
line = os.read(infd, 512)
if line:
data = lg_pack(line, seqno)
seqno += 1
dump_raw(data, True)
os.write(fd, data)
os.close(fd)
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