#!/usr/bin/env bash
PROGRAM="backup_tool_script"
PROGRAM_VERSION=0.4.2
PROGRAM_BUILD=2018070301
AUTHOR="(C) 2017-2018 by Orsiris de Jong"
CONTACT="http://www.netpower.fr - ozy@netpower.fr"
IS_STABLE=yes

## backup_tool_script - A script to check burp backup sanity

## backup_tool_script can verify a given number of backups for each client. It can run verifiy operations in parallel.
## Verify operations are timed in order to stop them after a given amount of time, leaving the system performance ready for backup operations.
## The script can also list clients that have outdated backups. It uses two different methods to list clients in order to detect rogue clients.
## It can also ensure that the burp server service is running properly, relaunch it if needed, on a scheduled basis.
## The script can send a warning / error when problems are found, even while operating.
## The script can send a warning / error when disk quotas exceed, even while operating.
## backup_tool_script can also launch vss_strip for each file found in a given directory.
## The script can also send mails directly to the client, if an email address is given in client config file as 'label = email_address : some@example.com'

## When exiting, backup_tool_script ensures that no forked burp processes remain, without touching other burp processes that didn't belong to backup_tool_script.

## Set an unique identifier for the script which will be used for logs and alert mails
INSTANCE_ID="base"

## Backup verifications timers
## After how much time (in seconds) for a single verification a warning should be logged (defaults to 3 hours)
SOFT_MAX_EXEC_TIME_PER_VERIFY=10800
## After how much time (in seconds) for a single verification the process should be stopped (defaults to 5 hours)
HARD_MAX_EXEC_TIME_PER_VERIFY=18000
## After how much seconds of execution of all steps a warning should be logged (defaults to 10 hours)
SOFT_MAX_EXEC_TIME=64800
## After how much seconds of execution of all steps a verification process should be stopped (defaults to 12 hours)
HARD_MAX_EXEC_TIME=82800

# Verify operations checks
## When a client isn't idle, we can postpone the it's backup verification process. How many times should we retry the verification command. Set this to 0 to disable operation postponing
POSTPONE_RETRY=2
## When postponed, how much time (in seconds) before next try (defauls to 1 hour)
POSTPONE_TIME=3600

## Backup executable (can be set to /usr/sbin/burp, /usr/local/sbin/burp, or autodetect via $(type -p burp))
BACKUP_EXECUTABLE=/usr/sbin/burp

## burp service type (can be "initv" or "systemd")
SERVICE_TYPE=initv

## How many simultaneous verify operations should be launched (please check I/O and CPU usage before increasing this)
PARELLEL_VERIFY_CONCURRENCY=2

# ------------ Mail alert settings -------------

## General alert mail subject
MAIL_ALERT_MSG="Execution of $PROGRAM instance $INSTANCE_ID on $(date) has warnings/errors."

## Optional change of mail body encoding (using iconv)
## By default, all mails are sent in UTF-8 format without headers
## You may specify an optional encoding here (like "ISO-8859-1" or whatever iconv can handle) for maximal compatibility
MAIL_BODY_CHARSET="ISO-8859-1"

# ------------ Client specific alert email template --------------

## Email subject
CLIENT_ALERT_SUBJECT="burp backup - Warning about your backup"

## Valid message body placeholders are
## [NUMBERDAYS] is the number of days we check.
## [QUOTAEXCEED] is the size of the actual backup versus the quota.
## [CLIENT] is the client name
## [INSTANCE] is the current instance name

## Message sent directly to client email address when no recent backups are found.
CLIENT_ALERT_BODY_OUTDATED="Hello,

No valid backup sets found in the last [NUMBERDAYS] day(s) for client [CLIENT].
Please leave your computer online enough time for a backup to occur.
Contact your system administrator for further information.

burp backup server $INSTANCE.
"

# Message sent directly to client email address when quota exceeded.
CLIENT_ALERT_BODY_QUOTA="Hello,

Your backup disk quota has been exceeded ([QUOTAEXCEED]) for client [CLIENT].
Contact your system administrator for further information.

burp backup server $INSTANCE.
"

# ------------ Do not modify under this line unless you have great cow powers --------------

if ! type "$BASH" > /dev/null; then
	echo "Please run this script only with bash shell. Tested on bash >= 3.2"
	exit 127
fi

export LC_ALL=C

_LOGGER_SILENT=false
_LOGGER_VERBOSE=false
_LOGGER_ERR_ONLY=false
_LOGGER_PREFIX="date"
if [ "$KEEP_LOGGING" == "" ]; then
	KEEP_LOGGING=1801
fi

# Initial error status, logging 'WARN', 'ERROR' or 'CRITICAL' will enable alerts flags
ERROR_ALERT=false
WARN_ALERT=false

LOCAL_USER=$(whoami)
LOCAL_HOST=$(hostname)

SCRIPT_PID=$$

TSTAMP=$(date '+%Y%m%dT%H%M%S.%N')

ALERT_LOG_FILE="$RUN_DIR/$PROGRAM.$SCRIPT_PID.$TSTAMP.last.log"

## Default log file until config file is loaded
if [ -w /var/log ]; then
	LOG_FILE="/var/log/$PROGRAM.log"
elif ([ "$HOME" != "" ] && [ -w "$HOME" ]); then
	LOG_FILE="$HOME/$PROGRAM.log"
elif [ -w . ]; then
	LOG_FILE="./$PROGRAM.log"
else
	LOG_FILE="/tmp/$PROGRAM.log"
fi

## Default directory where to store temporary run files
if [ -w /tmp ]; then
	RUN_DIR=/tmp
elif [ -w /var/tmp ]; then
	RUN_DIR=/var/tmp
else
	RUN_DIR=.
fi

#### DEBUG SUBSET ####
## allow function call checks                   #__WITH_PARANOIA_DEBUG
if [ "$_PARANOIA_DEBUG" == "yes" ];then         #__WITH_PARANOIA_DEBUG
	_DEBUG=yes                              #__WITH_PARANOIA_DEBUG
fi                                              #__WITH_PARANOIA_DEBUG

## allow debugging from command line with _DEBUG=yes
if [ ! "$_DEBUG" == "yes" ]; then
	_DEBUG=no
	_LOGGER_VERBOSE=false
else
	trap 'TrapError ${LINENO} $?' ERR
	_LOGGER_VERBOSE=true
fi

if [ "$SLEEP_TIME" == "" ]; then # Leave the possibity to set SLEEP_TIME as environment variable when runinng with bash -x in order to avoid spamming console
	SLEEP_TIME=.1
fi
#### DEBUG SUBSET END ####

#### Logger SUBSET ####
#### RemoteLogger SUBSET ####

# Array to string converter, see http://stackoverflow.com/questions/1527049/bash-join-elements-of-an-array
# usage: joinString separaratorChar Array
function joinString {
	local IFS="$1"; shift; echo "$*";
}

# Sub function of Logger
function _Logger {
	local logValue="${1}"           # Log to file
	local stdValue="${2}"           # Log to screeen
	local toStdErr="${3:-false}"    # Log to stderr instead of stdout

	if [ "$logValue" != "" ]; then
		echo -e "$logValue" >> "$LOG_FILE"
		# Current log file
		echo -e "$logValue" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.$SCRIPT_PID.$TSTAMP"
	fi

	if [ "$stdValue" != "" ] && [ "$_LOGGER_SILENT" != true ]; then
		if [ $toStdErr == true ]; then
			# Force stderr color in subshell
			(>&2 echo -e "$stdValue")

		else
			echo -e "$stdValue"
		fi
	fi
}

# General log function with log levels:

# Environment variables
# _LOGGER_SILENT: Disables any output to stdout & stderr
# _LOGGER_ERR_ONLY: Disables any output to stdout except for ALWAYS loglevel
# _LOGGER_VERBOSE: Allows VERBOSE loglevel messages to be sent to stdout

# Loglevels
# Except for VERBOSE, all loglevels are ALWAYS sent to log file

# CRITICAL, ERROR, WARN sent to stderr, color depending on level, level also logged
# NOTICE sent to stdout
# VERBOSE sent to stdout if _LOGGER_VERBOSE = true
# ALWAYS is sent to stdout unless _LOGGER_SILENT = true
# DEBUG & PARANOIA_DEBUG are only sent to stdout if _DEBUG=yes
function Logger {
	local value="${1}"              # Sentence to log (in double quotes)
	local level="${2}"              # Log level
	local retval="${3:-undef}"      # optional return value of command

	if [ "$_LOGGER_PREFIX" == "time" ]; then
		prefix="TIME: $SECONDS - "
	elif [ "$_LOGGER_PREFIX" == "date" ]; then
		prefix="$(date) - "
	else
		prefix=""
	fi

	## Obfuscate _REMOTE_TOKEN in logs (for ssh_filter usage only in osync and obackup)
	value="${value/env _REMOTE_TOKEN=$_REMOTE_TOKEN/__(o_O)__}"
	value="${value/env _REMOTE_TOKEN=\$_REMOTE_TOKEN/__(o_O)__}"

	if [ "$level" == "CRITICAL" ]; then
		_Logger "$prefix($level):$value" "$prefix\e[1;33;41m$value\e[0m" true
		ERROR_ALERT=true
		# ERROR_ALERT / WARN_ALERT isn't set in main when Logger is called from a subprocess. Need to keep this flag.
		echo -e "[$retval] in [$(joinString , ${FUNCNAME[@]})] SP=$SCRIPT_PID P=$$\n$prefix($level):$value" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.error.$SCRIPT_PID.$TSTAMP"
		return
	elif [ "$level" == "ERROR" ]; then
		_Logger "$prefix($level):$value" "$prefix\e[91m$value\e[0m" true
		ERROR_ALERT=true
		echo -e "[$retval] in [$(joinString , ${FUNCNAME[@]})] SP=$SCRIPT_PID P=$$\n$prefix($level):$value" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.error.$SCRIPT_PID.$TSTAMP"
		return
	elif [ "$level" == "WARN" ]; then
		_Logger "$prefix($level):$value" "$prefix\e[33m$value\e[0m" true
		WARN_ALERT=true
		echo -e "[$retval] in [$(joinString , ${FUNCNAME[@]})] SP=$SCRIPT_PID P=$$\n$prefix($level):$value" >> "$RUN_DIR/$PROGRAM.${FUNCNAME[0]}.warn.$SCRIPT_PID.$TSTAMP"
		return
	elif [ "$level" == "NOTICE" ]; then
		if [ "$_LOGGER_ERR_ONLY" != true ]; then
			_Logger "$prefix$value" "$prefix$value"
		fi
		return
	elif [ "$level" == "VERBOSE" ]; then
		if [ $_LOGGER_VERBOSE == true ]; then
			_Logger "$prefix($level):$value" "$prefix$value"
		fi
		return
	elif [ "$level" == "ALWAYS" ]; then
		_Logger "$prefix$value" "$prefix$value"
		return
	elif [ "$level" == "DEBUG" ]; then
		if [ "$_DEBUG" == "yes" ]; then
			_Logger "$prefix$value" "$prefix$value"
			return
		fi
	elif [ "$level" == "PARANOIA_DEBUG" ]; then                             #__WITH_PARANOIA_DEBUG
		if [ "$_PARANOIA_DEBUG" == "yes" ]; then                        #__WITH_PARANOIA_DEBUG
			_Logger "$prefix$value" "$prefix\e[35m$value\e[0m"      #__WITH_PARANOIA_DEBUG
			return                                                  #__WITH_PARANOIA_DEBUG
		fi                                                              #__WITH_PARANOIA_DEBUG
	else
		_Logger "\e[41mLogger function called without proper loglevel [$level].\e[0m" "\e[41mLogger function called without proper loglevel [$level].\e[0m" true
		_Logger "Value was: $prefix$value" "Value was: $prefix$value" true
	fi
}
#### Logger SUBSET END ####

# Portable child (and grandchild) kill function tester under Linux, BSD and MacOS X
function KillChilds {
	local pid="${1}" # Parent pid to kill childs
	local self="${2:-false}" # Should parent be killed too ?

	# Paranoid checks, we can safely assume that $pid shouldn't be 0 nor 1
	if [ $(IsInteger "$pid") -eq 0 ] || [ "$pid" == "" ] || [ "$pid" == "0" ] || [ "$pid" == "1" ]; then
		Logger "Bogus pid given [$pid]." "CRITICAL"
		return 1
	fi

	if kill -0 "$pid" > /dev/null 2>&1; then
		# Warning: pgrep is not native on cygwin, have this checked in CheckEnvironment
		if children="$(pgrep -P "$pid")"; then
			if [[ "$pid" == *"$children"* ]]; then
				Logger "Bogus pgrep implementation." "CRITICAL"
				children="${children/$pid/}"
			fi
			for child in $children; do
				Logger "Launching KillChilds \"$child\" true" "DEBUG"   #__WITH_PARANOIA_DEBUG
				KillChilds "$child" true
			done
		fi
	fi

	# Try to kill nicely, if not, wait 15 seconds to let Trap actions happen before                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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