131 lines
3.1 KiB
Bash
131 lines
3.1 KiB
Bash
#!/bin/sh -e
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#
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# This script is run if the interface (recognized by its MAC address) lacks
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# a rule for persistent naming.
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#
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# If there is already a persistent rule with that interface name then the
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# current interface needs to be renamed.
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#
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# If the interface needs to be renamed, a NAME=value pair will be printed
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# on stdout to allow udev to IMPORT it. Then a rule for the MAC address and
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# interface name is written.
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#
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# (C) 2006 Marco d'Itri <md@Linux.IT>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation version 2 of the License.
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RULES_FILE='/etc/udev/rules.d/70-persistent-net.rules'
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. /lib/udev/rule_generator.functions
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interface_name_taken() {
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local value="$(find_all_rules 'NAME=' $INTERFACE)"
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if [ "$value" ]; then
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return 0
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else
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return 1
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fi
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}
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find_next_available() {
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raw_find_next_available "$(find_all_rules 'NAME=' "$1")"
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}
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write_rule() {
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local match="$1"
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local name="$2"
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local comment="$3"
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{
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if [ "$PRINT_HEADER" ]; then
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PRINT_HEADER=
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echo "# This file was automatically generated by the $0"
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echo "# program, probably run by the persistent-net-generator.rules rules file."
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echo "#"
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echo "# You can modify it, as long as you keep each rule on a single line."
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fi
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echo ""
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[ "$comment" ] && echo "# $comment"
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echo "SUBSYSTEM==\"net\", $match, NAME=\"$name\""
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} >> $RULES_FILE
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}
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# used only if $RULES_FILE is empty, like on installation
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if [ "$1" = "all_interfaces" ]; then
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if [ -e $RULES_FILE ]; then
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printf "$RULES_FILE exists, persistent interface names\nnot saved.\n" >&2
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exit 0
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fi
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if [ ! -e /sys/class/net/ ]; then
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echo "/sys/class/net/ is not available, persistent interface names not saved." >&2
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exit 0
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fi
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cd /sys/class/net/ || return 0
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for INTERFACE in *; do
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case $INTERFACE in
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eth*|ath*|wlan*|ra*|sta*) ;;
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*) continue ;;
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esac
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INTERFACE="$INTERFACE" DEVPATH="/class/net/$INTERFACE" \
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/lib/udev/write_net_rules || true
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done
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exit 0
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fi
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if [ -z "$INTERFACE" ]; then
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echo "Missing \$INTERFACE." >&2
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exit 1
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fi
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if [ "$1" ]; then
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MAC_ADDR="$1"
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else
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MAC_ADDR=$(sysread address)
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fi
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if [ -z "$MAC_ADDR" ]; then
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echo "No MAC address for $INTERFACE." >&2
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exit 1
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fi
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if [ "$MAC_ADDR" = "00:00:00:00:00:00" ]; then
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echo "NULL MAC address for $INTERFACE." >&2
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exit 1
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fi
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# Prevent concurrent processes from modifying the file at the same time.
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lock_rules_file
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# Check if the rules file is writeable.
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choose_rules_file
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# If a rule using the current name already exists then find a new name and
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# report it to udev which will rename the interface.
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basename=${INTERFACE%%[0-9]*}
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if interface_name_taken; then
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INTERFACE="$basename$(find_next_available "$basename[0-9]*")"
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if [ ! -t 1 ]; then
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echo "INTERFACE_NEW=$INTERFACE"
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fi
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fi
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# the DRIVERS key is needed to not match bridges and VLAN sub-interfaces
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match="DRIVERS==\"?*\", ATTRS{address}==\"$MAC_ADDR\""
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if [ $basename = "ath" -o $basename = "wlan" ]; then
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match="$match, ATTRS{type}==\"1\"" # do not match the wifi* interfaces
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fi
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write_rule "$match" "$INTERFACE" "$COMMENT"
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unlock_rules_file
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exit 0
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