etc/vps-functions

#!/bin/bash
#  Copyright (C) 2000-2006 SWsoft. All rights reserved.
#
#  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.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#
# Common stuff for vzctl helper scripts
# get the name of the script
SELFNAME=`basename $0`

# Set the sane umask
umask 022

# Error codes
VZ_INVALID_PARAMETER_SYNTAX=20
VZ_FS_NO_DISK_SPACE=46
VZ_FS_BAD_TMPL=47
VZ_FS_NEW_VE_PRVT=48
VZ_CHANGEPASS=74
VZ_CANT_ADDIP=34
VZ_IP_INUSE=78

# iptables parameters
VE_STATE_DIR="/var/lib/vzctl/veip/"
CONF_DIR="/etc/vz/conf/"

ARPSEND_CMD="arpsend -c 1 -w 1"
IP_CMD=/sbin/ip

# Prints error message and exits
# Parameters:
#   $1 - error message
#   $2 - exit code
# Example of usage:
#   vzerror "Fatal error" 1
function vzerror()
{
	# print errors to stdout too
	ERR=$?
	echo "$SELFNAME ERROR: $1"
	exit $2
}

# Prints warning message
# Parameters:
#   $* - error message
# Example of usage:
#   vzwarning Invalid user
function vzwarning()
{
	echo "$SELFNAME WARNING: $*"
}

# Prints debug message
# Parameters:
#   $* - debug message
# Example of usage:
#   vzdebug Trying to start ls
function vzdebug()
{
	echo "$SELFNAME: $*"
}

# Checks if environment variable exists,
# and exits with exit code 1 if not
# Parameters:
#   $* - option names
# Example:
#   vzcheckvar VEID IP_ADDR
function vzcheckvar()
{
	for VAR in $*; do
		if eval test "\"x\$$VAR\"" = "x"; then
			vzerror "Missing parameter: $VAR" $VZ_INVALID_PARAMETER_SYNTAX
		fi
	done
}

# This function fills $NETDEVICES with all network interfaces
# You should always call it before calling vzarp
function vzgetnetdev()
{
# Get a list of interfaces, excluding ones with LOOPBACK NOARP or SLAVE flags
	NETDEVICES=`${IP_CMD} link list | egrep -v -E "LOOPBACK|NOARP|SLAVE" | \
	awk "/^[0-9].*:/&&/UP/ {print substr(\\$2, 0, length(\\$2)-1)}"`
}

# Adds/deletes public ARP records for given IP for all interfaces
# Parameters:
#   $1		- should be either "add" or "del"
#   $2          - IP address
#   $NETDEVICES - Network devices used to take MAC addresses from
function vzarp()
{
	local DEV

	[ -z "${NETDEVICES}" ] && vzwarning "Device list is empty"
	for DEV in $NETDEVICES; do
		${IP_CMD} neigh $1 proxy $2 dev $DEV > /dev/null 2>&1
	done
}

# Send ARP request to detect that somebody already have this IP 
function vzarpipdetect()
{
	local DEV
	local ip
	local cmd

	[ -z "${1}" ] && return
	[ "${SKIP_ARPDETECT}" = "yes" ] && return

	for ip in ${1}; do
		cmd="$cmd -e $ip"
	done

	for DEV in $NETDEVICES; do
		${ARPSEND_CMD} -D ${cmd} $DEV || vzwarning "${ARPSEND_CMD} -D ${cmd} $DEV FAILED"
	done	
}

# Send ARP request to update neighbour ARP caches
function vzarpipset()
{
	local DEV
	local ip
	local dev

	[ -z "${1}" ] && return

	for dev in $NETDEVICES; do
		for ip in ${1}; do
			opt="-i ${ip} -e ${ip}"
			${ARPSEND_CMD} -U ${opt} ${dev} || vzwarning "${ARPSEND_CMD} -U ${opt} ${dev} FAILED"
		done
	done	
}

# Sets VE0 source routing for given IP
# Parameters:
#   $1 - IP address
function vzaddrouting()
{
	local src_addr
	local device=
	if ! ${IP_CMD} route list $1 | grep "$1 dev venet0" > /dev/null 2>&1;
	then
		if [ -n "${VE_ROUTE_SRC_DEV}" ]; then
			device="dev ${VE_ROUTE_SRC_DEV}"
		fi
		src_addr=`ip route list table local ${device} | grep '^local'|\
			cut -d' ' -f2 | grep -v '^127\.' | head -n 1`
		if [ -z "${src_addr}" ]; then
			vzerror "Unable to get source ip [${device}]" $VZ_CANT_ADDIP
		fi
		${IP_CMD} route add $1 dev venet0 src ${src_addr} || \
			vzerror "Unable to add route ${IP_CMD} route add $1 dev venet0 src ${src_addr}" $VZ_CANT_ADDIP
	fi
}

# Deletes VE0 source routing for given IP
# Parameters:
#   $1 - IP address
function vzdelrouting()
{
if ${IP_CMD} route list $1 | grep  "$1 dev venet0" >/dev/null 2>&1; then
	${IP_CMD} route del $1 dev venet0 || \
		vzwarning "Unable to del route ${IP_CMD} route del $1 dev venet0"
fi
}