mirror of
https://github.com/librenms/librenms.git
synced 2024-10-07 16:52:45 +00:00
feature: Add support for dynamic interfaces in ifAlias script (#6005)
* add support for dynamic interfaces in ifAlias script * netlink and ip support alias (`ip link set IFACE alias ALIAS`). In an environment with dynamic interfaces, it is useful to be able retrieve aliases from ip. * we cannot assume next iface oid is n + 1 since oids do not necessarily follow incrementally when some interfaces has been destroyed and recreated. * use straight POSIX shell * I agree to the conditions of the Contributor Agreement contained in doc/General/Contributing.md.
This commit is contained in:
ollb
Neil Lathwood
132
scripts/ifAlias
132
scripts/ifAlias
@@ -1,58 +1,128 @@
|
||||
#!/bin/bash
|
||||
# (c) 2013, 2014, f0o@devilcode.org
|
||||
#!/bin/sh
|
||||
# (c) 2013-2017, f0o@devilcode.org, olb@nebkha.net
|
||||
# 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/>.
|
||||
|
||||
DISTRO_BIN="/usr/bin/distro"
|
||||
BASE='.1.3.6.1.2.1.31.1.1.1.18'
|
||||
ID=$(cut -d . -f 13 <<< $2)
|
||||
cache=$(ip l)
|
||||
GET_TYPE="$1"
|
||||
GET_OID="$2"
|
||||
|
||||
if [ -z "$ID" ]; then
|
||||
ID=1
|
||||
else
|
||||
ID=$(($ID+1))
|
||||
fi
|
||||
# cache ip link output
|
||||
IP_LINK="$(ip link)"
|
||||
|
||||
IFACE=$(grep "^${ID}: " <<<"$cache" | sed 's/[:@]\s/ /g'| cut -d " " -f 2 | cut -d @ -f 1)
|
||||
# Get interface id from GET_OID script parameter depending on the get type -g
|
||||
# or -n.
|
||||
#
|
||||
# snmpd specify two behaviors: GETNEXT and GET.
|
||||
#
|
||||
# script -g <GET_OID>
|
||||
#
|
||||
# : Should return OID value
|
||||
#
|
||||
# script -n <GET_OID>
|
||||
#
|
||||
# : Should return next OID value
|
||||
#
|
||||
# Note that interface id are not necessarly following incrementally.
|
||||
# We need tho find the next interface id (which is not necessarily n+1).
|
||||
#
|
||||
interface_id()
|
||||
{
|
||||
local N=
|
||||
local L=
|
||||
local ID="${GET_OID#${BASE}.}"
|
||||
|
||||
echo ${BASE}.${ID}
|
||||
if [ "X${IFACE}" = "X" ]; then
|
||||
echo noSuchName
|
||||
else
|
||||
echo "string"
|
||||
if [ -x /usr/bin/distro ]; then
|
||||
case $(distro | cut -d " " -f 1) in
|
||||
case "$GET_TYPE" in
|
||||
-g)
|
||||
echo "$ID"
|
||||
return 0
|
||||
;;
|
||||
-n)
|
||||
if [ "$ID" = "$BASE" ]
|
||||
then
|
||||
# find the first iface_id
|
||||
echo "$IP_LINK" | grep -oE "^[0-9]+:" | head -n 1 | cut -d':' -f 1
|
||||
return 0
|
||||
else
|
||||
# find the next iface_id
|
||||
for N in $(echo "$IP_LINK" | grep -oE "^[0-9]+:" | cut -d':' -f 1)
|
||||
do
|
||||
if [ "$L" = "$ID" -o ! "$ID" ]
|
||||
then
|
||||
echo -n "$N"
|
||||
return 0
|
||||
fi
|
||||
L="$N"
|
||||
done
|
||||
fi
|
||||
;;
|
||||
esac
|
||||
return 1
|
||||
}
|
||||
|
||||
interface_name()
|
||||
{
|
||||
local IFACE_ID="$1"
|
||||
echo "$IP_LINK" | grep -oE "^${IFACE_ID}: [^:@ ]*" | cut -d " " -f 2
|
||||
}
|
||||
|
||||
alias_from_interfaces_config_file()
|
||||
{
|
||||
local IFACE="$1"
|
||||
local CONFIG_FILE=
|
||||
|
||||
if [ -x "$DISTRO_BIN" ]
|
||||
then
|
||||
case "$("$DISTRO_BIN" | cut -d " " -f 1)" in
|
||||
Debian)
|
||||
cnf="/etc/network/interfaces"
|
||||
CONFIG_FILE="/etc/network/interfaces"
|
||||
;;
|
||||
Gentoo)
|
||||
cnf="/etc/conf.d/net"
|
||||
CONFIG_FILE="/etc/conf.d/net"
|
||||
;;
|
||||
CentOS|RedHat|SuSE|Mandriva|Mandrake)
|
||||
cnf="/etc/sysconfig/network-scripts/ifcfg-$IFACE"
|
||||
CONFIG_FILE="/etc/sysconfig/network-scripts/ifcfg-$IFACE"
|
||||
;;
|
||||
Archlinux)
|
||||
cnf="/etc/conf.d/net-conf-$IFACE"
|
||||
;;
|
||||
*)
|
||||
cnf=""
|
||||
CONFIG_FILE="/etc/conf.d/net-conf-$IFACE"
|
||||
;;
|
||||
esac
|
||||
fi
|
||||
if [ -n "$cnf" ]; then
|
||||
echo $(grep -i "^# $IFACE:" $cnf | sed "s/^# $IFACE: //i")
|
||||
else
|
||||
echo
|
||||
if [ "$CONFIG_FILE" ]
|
||||
then
|
||||
echo "$(grep -i "^# $IFACE:" $CONFIG_FILE | sed "s/^# $IFACE: //i")"
|
||||
fi
|
||||
fi
|
||||
}
|
||||
|
||||
alias_from_ip_link()
|
||||
{
|
||||
local IFACE="$1"
|
||||
ip link show "$IFACE" | grep -e "^[[:space:]]*alias[[:space:]]" | sed -e 's/^[[:space:]]*alias //'
|
||||
}
|
||||
|
||||
IFACE_ID="$(interface_id)"
|
||||
[ "$IFACE_ID" ] || exit
|
||||
|
||||
IFACE="$(interface_name "$IFACE_ID")"
|
||||
|
||||
VALUE=
|
||||
# we first try to get alias from interface config file
|
||||
[ "$VALUE" ] || VALUE="$(alias_from_interfaces_config_file "$IFACE")"
|
||||
# then from ip link show $IFACE output
|
||||
[ "$VALUE" ] || VALUE="$(alias_from_ip_link "$IFACE")"
|
||||
|
||||
echo "${BASE}.${IFACE_ID}"
|
||||
echo "string"
|
||||
echo "$VALUE"
|
||||
exit 0
|
||||
|
||||
Reference in New Issue
Block a user