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698584e14d
* 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.
129 lines
3.4 KiB
Bash
Executable File
129 lines
3.4 KiB
Bash
Executable File
#!/bin/sh
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# (c) 2013-2017, f0o@devilcode.org, olb@nebkha.net
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# This program 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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# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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DISTRO_BIN="/usr/bin/distro"
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BASE='.1.3.6.1.2.1.31.1.1.1.18'
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GET_TYPE="$1"
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GET_OID="$2"
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# cache ip link output
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IP_LINK="$(ip link)"
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# Get interface id from GET_OID script parameter depending on the get type -g
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# or -n.
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#
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# snmpd specify two behaviors: GETNEXT and GET.
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#
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# script -g <GET_OID>
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#
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# : Should return OID value
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#
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# script -n <GET_OID>
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#
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# : Should return next OID value
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#
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# Note that interface id are not necessarly following incrementally.
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# We need tho find the next interface id (which is not necessarily n+1).
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#
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interface_id()
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{
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local N=
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local L=
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local ID="${GET_OID#${BASE}.}"
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case "$GET_TYPE" in
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-g)
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echo "$ID"
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return 0
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;;
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-n)
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if [ "$ID" = "$BASE" ]
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then
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# find the first iface_id
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echo "$IP_LINK" | grep -oE "^[0-9]+:" | head -n 1 | cut -d':' -f 1
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return 0
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else
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# find the next iface_id
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for N in $(echo "$IP_LINK" | grep -oE "^[0-9]+:" | cut -d':' -f 1)
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do
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if [ "$L" = "$ID" -o ! "$ID" ]
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then
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echo -n "$N"
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return 0
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fi
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L="$N"
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done
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fi
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;;
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esac
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return 1
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}
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interface_name()
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{
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local IFACE_ID="$1"
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echo "$IP_LINK" | grep -oE "^${IFACE_ID}: [^:@ ]*" | cut -d " " -f 2
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}
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alias_from_interfaces_config_file()
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{
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local IFACE="$1"
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local CONFIG_FILE=
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if [ -x "$DISTRO_BIN" ]
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then
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case "$("$DISTRO_BIN" | cut -d " " -f 1)" in
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Debian)
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CONFIG_FILE="/etc/network/interfaces"
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;;
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Gentoo)
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CONFIG_FILE="/etc/conf.d/net"
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;;
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CentOS|RedHat|SuSE|Mandriva|Mandrake)
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CONFIG_FILE="/etc/sysconfig/network-scripts/ifcfg-$IFACE"
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;;
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Archlinux)
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CONFIG_FILE="/etc/conf.d/net-conf-$IFACE"
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;;
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esac
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fi
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if [ "$CONFIG_FILE" ]
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then
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echo "$(grep -i "^# $IFACE:" $CONFIG_FILE | sed "s/^# $IFACE: //i")"
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fi
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}
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alias_from_ip_link()
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{
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local IFACE="$1"
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ip link show "$IFACE" | grep -e "^[[:space:]]*alias[[:space:]]" | sed -e 's/^[[:space:]]*alias //'
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}
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IFACE_ID="$(interface_id)"
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[ "$IFACE_ID" ] || exit
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IFACE="$(interface_name "$IFACE_ID")"
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VALUE=
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# we first try to get alias from interface config file
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[ "$VALUE" ] || VALUE="$(alias_from_interfaces_config_file "$IFACE")"
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# then from ip link show $IFACE output
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[ "$VALUE" ] || VALUE="$(alias_from_ip_link "$IFACE")"
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echo "${BASE}.${IFACE_ID}"
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echo "string"
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echo "$VALUE"
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exit 0
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