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237 lines
11 KiB
237 lines
11 KiB
3 years ago
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#!/bin/bash
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##################################################################################
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# Formats crontab string for periodic APRS beacon and #
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# replaces the original crontab entry string with this #
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# new string thus changing the crontab. #
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# #
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# (C)2021 M.T. Konstapel https://meezenest.nl/mees #
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# #
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# This file is part of PE1RXF-APRS-server. #
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# #
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# PE1RXF-APRS-server is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# PE1RXF-APRS-server is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with PE1RXF-APRS-server If not, see <https://www.gnu.org/licenses/>. #
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# #
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##################################################################################
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source /home/marcel/ham/aprs_utils/config.shlib; # load the config library functions
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############################################################
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# Help #
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############################################################
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Help()
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{
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# Display Help
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echo "Set interval of APRS beacons in crontab."
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echo
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echo "Syntax: set_beacon.sh [-i <interface>|-t <time>|-c <config-file>]"
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echo "Options:"
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echo "-i AX.25 interface (ax0 or ax1)"
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echo "-t Time interval in minutes (0-60), 0 disables beacon"
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echo "-c Read from config file instead of command line arguments"
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echo
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}
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############################################################
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# This function update the crontab of user marcel #
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############################################################
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UpdateCrontab()
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{
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# All those escaped characters were a nightmare, but in the end the resulting string was perfect. But executing the string directly from this script proved to be another nightmare:
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# It appears that bash inserts additional escape characters, resulting in the command not working. The solution below is not very elegant, but hey...it works!
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# Let's make a bash script, execute is and remove it again.
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echo "#!/bin/bash" > $sed_tmp_command_file
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echo "$sed_string" >> $sed_tmp_command_file
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chmod u+x $sed_tmp_command_file
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$sed_tmp_command_file
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rm $sed_tmp_command_file
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# Update crontab
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/usr/bin/crontab -u marcel $crontab_intermediate_file
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}
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###############################################################
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# Generates beacon files which are send via a crontab process #
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###############################################################
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ConstructBeaconFile()
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{
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if [ "${1}" == "ax0" ]; then
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ConstructBeaconFile_Destination="$(config_get ax0_beacon_destination $ConfigFile)"
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ConstructBeaconFile_Path="$(config_get ax0_beacon_path $ConfigFile)"
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ConstructBeaconFile_Position="$(config_get ax0_beacon_position $ConfigFile)"
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ConstructBeaconFile_Comment="$(config_get ax0_beacon_comment $ConfigFile)"
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ConstructBeaconFile_File="$(config_get ax0_beacon_file $ConfigFile)"
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if [ "$ConstructBeaconFile_Path" == "none" ]; then
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ConstructBeaconFile_Beacon="PE1RXF-1>$ConstructBeaconFile_Destination:$ConstructBeaconFile_Position$ConstructBeaconFile_Comment"
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else
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ConstructBeaconFile_Beacon="PE1RXF-1>$ConstructBeaconFile_Destination,$ConstructBeaconFile_Path:$ConstructBeaconFile_Position$ConstructBeaconFile_Comment"
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fi
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echo "Beacon for ax0:"
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echo $ConstructBeaconFile_Beacon
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echo $ConstructBeaconFile_Beacon > $ConstructBeaconFile_File
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else
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ConstructBeaconFile_Destination="$(config_get ax1_beacon_destination $ConfigFile)"
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ConstructBeaconFile_Path="$(config_get ax1_beacon_path $ConfigFile)"
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ConstructBeaconFile_Position="$(config_get ax1_beacon_position $ConfigFile)"
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ConstructBeaconFile_Comment="$(config_get ax1_beacon_comment $ConfigFile)"
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ConstructBeaconFile_File="$(config_get ax1_beacon_file $ConfigFile)"
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if [ "$ConstructBeaconFile_Path" == "none" ]; then
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ConstructBeaconFile_Beacon="PE1RXF-2>$ConstructBeaconFile_Destination:$ConstructBeaconFile_Position$ConstructBeaconFile_Comment"
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else
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ConstructBeaconFile_Beacon="PE1RXF-2>$ConstructBeaconFile_Destination,$ConstructBeaconFile_Path:$ConstructBeaconFile_Position$ConstructBeaconFile_Comment"
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fi
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echo "Beacon for ax1:"
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echo $ConstructBeaconFile_Beacon
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if [ "$ConstructBeaconFile_Path" == "none" ]; then
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ConstructBeaconFile_Beacon="/usr/sbin/beacon -d \"$ConstructBeaconFile_Destination\" -s ax1 '$ConstructBeaconFile_Position$ConstructBeaconFile_Comment'"
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else
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ConstructBeaconFile_Beacon="/usr/sbin/beacon -d \"$ConstructBeaconFile_Destination $ConstructBeaconFile_Path\" -s ax1 '$ConstructBeaconFile_Position$ConstructBeaconFile_Comment'"
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fi
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echo $ConstructBeaconFile_Beacon > $ConstructBeaconFile_File
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fi
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}
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############################################################
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############################################################
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# Main program #
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############################################################
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############################################################
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# Set variables
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Interface="0"
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TimeInterval="-1"
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crontab_time_string="* * * * *"
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crontab_command_string_ax0="/home/marcel/ham/aprs_utils/send_beacon_internal_radio.sh"
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crontab_command_string_ax1="/home/marcel/ham/aprs_utils/send_beacon_external_radio.sh"
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crontab_full_string="#* * * * * /home/marcel/ham/aprs_utils/send_beacon_internal_radio.sh"
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crontab_intermediate_file="/home/marcel/ham/aprs_utils/crontab.pe1rxf"
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sed_tmp_command_file="/home/marcel/ham/aprs_utils/sed.cmd"
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work_with_config_file="0"
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############################################################
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# Process the input options. #
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############################################################
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# Get the options
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while getopts i:t:c: flag; do
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case "${flag}" in
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i) # interface
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Interface=${OPTARG};;
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t) # time interval beacon
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TimeInterval=${OPTARG};;
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c) # work with config_file
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work_with_config_file="1"
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ConfigFile=${OPTARG};;
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\?) # Invalid option
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echo "Syntax error!"
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Help
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exit;;
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esac
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done
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##############################################################
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# Get Beacon Timer Interval and translate to crontab syntax #
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##############################################################
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# Read values from config-file
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if [ "$work_with_config_file" -eq "1" ]; then
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for ax_port in ax0 ax1
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do
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Interface="$ax_port"
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if [ "$Interface" == "ax0" ]; then
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TimeInterval="$(config_get ax0_beacon_time $ConfigFile)"
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else
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TimeInterval="$(config_get ax1_beacon_time $ConfigFile)"
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fi
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# Let's generate new beacon files according to values in configuration file
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ConstructBeaconFile $Interface
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# Every 1 to 59 minutes
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if [ "$TimeInterval" -gt 0 ] && [ "$TimeInterval" -lt 60 ]; then
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crontab_time_string="*/$TimeInterval * * * *"
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# Never
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elif [ "$TimeInterval" -eq 0 ]; then
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crontab_time_string="#* * * * *"
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# Every hour
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elif [ "$TimeInterval" -eq 60 ]; then
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crontab_time_string="0 * * * *"
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else
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echo "No valid value. Using default."
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crontab_time_string="#* * * * *"
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fi
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# Select ax.25 port
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if [ "$Interface" == "ax0" ]; then
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crontab_full_string="$crontab_time_string $crontab_command_string_ax0"
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sed_string="sed -i \"/send_beacon_internal_radio/c\\$crontab_full_string\" $crontab_intermediate_file"
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elif [ "$Interface" == "ax1" ]; then
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crontab_full_string="$crontab_time_string $crontab_command_string_ax1"
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sed_string="sed -i \"/send_beacon_external_radio/c\\$crontab_full_string\" $crontab_intermediate_file"
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else
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echo "No valid value. Using default."
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crontab_full_string="$crontab_time_string $crontab_command_string_ax0"
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sed_string="sed -i \"/send_beacon_internal_radio/c\\$crontab_full_string\" $crontab_intermediate_file"
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fi
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UpdateCrontab
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done
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printf -- "Values read from file: %s$ConfigFile\n";
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printf -- "ax0 beacon time: %s\n" "$(config_get ax0_beacon_time $ConfigFile)";
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printf -- "ax1 beacon time: %s\n" "$(config_get ax1_beacon_time $ConfigFile)";
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# Read values from command line arguments
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else
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# Every 1 to 59 minutes
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if [ "$TimeInterval" -gt 0 ] && [ "$TimeInterval" -lt 60 ]; then
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crontab_time_string="*/$TimeInterval * * * *"
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# Never
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elif [ "$TimeInterval" -eq 0 ]; then
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crontab_time_string="#* * * * *"
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# Every hour
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elif [ "$TimeInterval" -eq 60 ]; then
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crontab_time_string="0 * * * *"
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else
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echo "Syntax error!"
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Help
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exit
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fi
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# Select ax.25 port
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if [ "$Interface" == "ax0" ]; then
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crontab_full_string="$crontab_time_string $crontab_command_string_ax0"
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sed_string="sed -i \"/send_beacon_internal_radio/c\\$crontab_full_string\" $crontab_intermediate_file"
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elif [ "$Interface" == "ax1" ]; then
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crontab_full_string="$crontab_time_string $crontab_command_string_ax1"
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sed_string="sed -i \"/send_beacon_external_radio/c\\$crontab_full_string\" $crontab_intermediate_file"
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else
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echo "Syntax error!"
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Help
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exit
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fi
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UpdateCrontab
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fi
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