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authorDavid Oberhollenzer <david.oberhollenzer@tele2.at>2018-04-26 20:34:14 +0200
committerDavid Oberhollenzer <david.oberhollenzer@tele2.at>2018-04-27 11:28:46 +0200
commit0ded4765344b6360cf4f030909d5bbe736a1a584 (patch)
treea9f56a14fa1b278f3c58bfe11ef6ed9394253459 /scripts/ifrename.sh.in
parent59731dd69bb4be66c721b3de66fb2ab80bec3e7e (diff)
Add optional script for persistent network interface renaming
Add a new service that runs a small helper script that applies a consistent, deterministic naming pattern to all interfaces, based on their mac address. A configuration file with wild card pattern matching can be used for determining names. By default, this is disabled. Also, this script is Linux specific. Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Diffstat (limited to 'scripts/ifrename.sh.in')
-rwxr-xr-xscripts/ifrename.sh.in65
1 files changed, 65 insertions, 0 deletions
diff --git a/scripts/ifrename.sh.in b/scripts/ifrename.sh.in
new file mode 100755
index 0000000..fee5444
--- /dev/null
+++ b/scripts/ifrename.sh.in
@@ -0,0 +1,65 @@
+#!/bin/sh
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# Copyright (C) 2018 - David Oberhollenzer
+#
+# 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 <https://www.gnu.org/licenses/>.
+#
+NAMERULES="@ETCPATH@/netcfg/ifrename"
+TMPPATH="/tmp/ifrename"
+
+[ -f "$NAMERULES" ] || exit 0
+
+mkdir -p "$TMPPATH"
+
+for IFPATH in /sys/class/net/*; do
+ [ "$IFPATH" == "/sys/class/net/lo" ] && continue
+
+ IF=`basename $IFPATH`
+ MAC=`cat $IFPATH/address`
+
+ grep "^[^,]\+,[^,]\+,[a-zA-Z0-9]\+$" $NAMERULES | while read LINE;
+ do
+ NAMECMP=$(echo $LINE | cut -d',' -f1)
+ ADDRCMP=$(echo $LINE | cut -d',' -f2)
+ RULE=$(echo $LINE | cut -d',' -f3)
+
+ case $IF in ($NAMECMP) ;; *) continue;; esac
+ case $MAC in ($ADDRCMP) ;; *) continue;; esac
+
+ echo "$MAC,$IF" >> "$TMPPATH/$RULE"
+ break
+ done
+done
+
+for FNAME in $TMPPATH/*; do
+ [ ! -f "$FNAME" ] && break
+
+ IDX=0
+ PREFIX=$(basename $FNAME)
+
+ sort -t',' -k1 -u $FNAME | while read LINE;
+ do
+ OLDNAME=$(echo $LINE | cut -d',' -f2)
+ NEWNAME="$PREFIX$IDX"
+ IDX=`expr $IDX + 1`
+
+ ip link set "$OLDNAME" name "$NEWNAME"
+ done
+
+ rm "$FNAME"
+done
+
+rmdir "$TMPPATH"