#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2012  IPFire Network Development Team                         #
#                                                                             #
# 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 3 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.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

LOG_FACILITY=$(basename ${0})

# Do not print any log messages because these may be sent to the modem.
LOG_DISABLE_STDOUT="true"

. /usr/lib/network/functions

# Read network settings
network_settings_read

log DEBUG "dialer called with arguments: $@"

# The zone is an optional argument.
ZONE=${1}
assert isset ZONE

# If we have the zone information, we will
# load the zone configuration.
if zone_exists ${ZONE}; then
	zone_settings_read "${ZONE}"
fi

# The default speaker settings is on.
at_speaker=${AT_SPEAKER_ON}

# The default dial method is tone dial.
at_dial=${AT_TONE_DIAL}

# Initalize the commandline
commandline=""

# If we are running in debug mode, we start chat with the
# verbose flag as well.
if enabled DEBUG; then
	commandline="${commandline} -v"
fi

# Create a temporary chat script file.
file=$(mktemp)
commandline="${commandline} -f ${file}"

# Helper function to write beatiful lines to
# the chat scripts.
println() {
	printf "%-30s %s\n" "$@" >> ${file}
}

### Write the connect script.

# Set the timeout value for the configuration commands to
# 3 seconds. This will be increased later.
println "TIMEOUT" 3

# Let's log everything until we are properly connected.
println "REPORT" "CONNECT"

# End the connection, when one of the following conditions
# happens:
for condition in "BUSY" "NO ANSWER" "NO CARRIER" "NO DIALTONE"; do
	println "ABORT" "'${condition}'"
done

# Now, we get to the exciting stuff.
# Initalize the modem.
println "''" "${AT_INITIALIZE}"
println "''" "AT"
println "''" "${AT_INITIALIZE}"

# End all left over connections by hanging up.
println "OK" "${AT_HANGUP}"

# Apply the speaker setting.
println "OK" "${at_speaker}"

# Set the APN if any.
if isset APN; then
	println "''" "'AT+CGDCONT=1,\"IP\",\"${APN}\"'"
fi

# Enter a 5 seconds break so the modem can setup itself
# to the settings we just transmitted to it.
for i in $(seq 0 5); do
	println "''" "\\d"
done

# Reset the timeout value to 30 seconds.
println "TIMEOUT" 30

# Actually dial the number.
println "OK" "${at_dial}${PHONE_NUMBER}"

# Wait for the CONNECT string.
println "CONNECT" "\\c"

# Exec the chat command which will start talking to the modem.
log DEBUG "Exec'ing chat with command line: ${commandline}"
exec chat ${commandline}

error "Could not execute chat. Exiting."
exit ${EXIT_ERROR}