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#!/bin/bash
# Copyright (c) 2004-2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# Contributed by Roy Marples (uberlord@gentoo.org)
# Fix any potential localisation problems
# Note that LC_ALL trumps LC_anything_else according to locale(7)
brctl() {
LC_ALL=C /sbin/brctl "$@"
}
# void bridge_depend(void)
#
# Sets up the dependancies for the module
bridge_depend() {
after interface macnet tuntap
before dhcp
functions interface_down interface_del_addresses interface_set_flag
variables bridge bridge_add brctl
}
# bool bridge_check_installed(void)
#
# Returns 1 if bridge is installed, otherwise 0
bridge_check_installed() {
[[ -x /sbin/brctl ]] && return 0
${1:-false} && eerror "For bridge support, emerge net-misc/bridge-utils"
return 1
}
# char* bridge_get_ports(char *interface)
#
# Returns the interfaces added to the given bridge
bridge_get_ports() {
brctl show 2>/dev/null \
| sed -n -e '/^'"$1"'/,/^\S/ { /^\('"$1"'\|\t\)/s/^.*\t//p }'
}
# char* bridge_get_bridge(char *interface)
#
# Returns the bridge interface of the given interface
bridge_get_bridge() {
local x=$( brctl show 2>/dev/null \
| sed -e '1 {d}; /^[^ ]/ { N }; /.*'"$1"'.*/ {s/^\([^ \t]\+\).*/\1/p}; d' )
local -a a=( ${x} )
if [[ ${#a[@]} == "1" ]]; then
echo "${x}"
elif [[ $1 == "${a[3]}" ]]; then
echo "${a[0]}"
fi
}
# bool bridge_exists(char *interface)
#
# Returns 0 if the bridge exists, otherwise 1
bridge_exists() {
brctl show 2>/dev/null | grep -q "^$1"
}
# bool bridge_create(char *interface)
#
# Creates the bridge - no ports are added here though
# Returns 0 on success otherwise 1
bridge_create() {
local iface="$1" ifvar=$( bash_variable "$1" ) x i opts
ebegin "Creating bridge ${iface}"
x=$( brctl addbr "${iface}" 2>&1 )
if [[ -n ${x} ]]; then
if [[ ${x//Package not installed/} != "${x}" ]]; then
eend 1 "Bridging (802.1d) support is not present in this kernel"
else
eend 1 "${x}"
fi
return 1
fi
opts="brctl_${ifvar}[@]"
for i in "${!opts}" ; do
x="${i/ / ${iface} }"
[[ ${x} == "${i}" ]] && x="${x} ${iface}"
x=$( brctl ${x} 2>&1 1>/dev/null )
[[ -n ${x} ]] && ewarn "${x}"
done
eend 0
}
# bool bridge_add_port(char *interface, char *port)
#
# Adds the port to the bridge
bridge_add_port() {
local iface="$1" port="$2" e
interface_set_flag "${port}" promisc true
interface_up "${port}"
e=$( brctl addif "${iface}" "${port}" 2>&1 )
if [[ -n ${e} ]]; then
interface_set_flag "${port}" promisc false
echo "${e}" >&2
return 1
fi
return 0
}
# bool bridge_delete_port(char *interface, char *port)
#
# Deletes a port from a bridge
bridge_delete_port() {
interface_set_flag "$2" promisc false
brctl delif "$1" "$2"
}
# bool bridge_start(char *iface)
#
# set up bridge
# This can also be called by non-bridges so that the bridge can be created
# dynamically
bridge_pre_start() {
local iface="$1" ports briface i ifvar=$( bash_variable "$1" ) opts
ports="bridge_${ifvar}[@]"
briface="bridge_add_${ifvar}"
opts="brctl_${ifvar}[@]"
[[ -z ${!ports} && -z ${!briface} && -z ${!opts} ]] && return 0
# Destroy the bridge if it exists
[[ -n ${!ports} ]] && bridge_stop "${iface}"
# Allow ourselves to add to the bridge
if [[ -z ${!ports} && -n ${!briface} ]]; then
ports="${iface}"
iface="${!briface}"
else
ports="${!ports}"
fi
# Create the bridge if needed
bridge_exists "${iface}" || bridge_create "${iface}"
if [[ -n ${ports} ]]; then
einfo "Adding ports to ${iface}"
eindent
for i in ${ports}; do
interface_exists "${i}" && continue
eerror "interface ${i} does not exist"
return 1
done
for i in ${ports}; do
ebegin "${i}"
bridge_add_port "${iface}" "${i}"
eend $? || return 1
done
eoutdent
fi
return 0
}
# bool bridge_stop(char *iface)
#
# Removes the device
# returns 0
bridge_stop() {
local iface="$1" ports i deletebridge=false extra=""
if bridge_exists "${iface}" ; then
ebegin "Destroying bridge ${iface}"
interface_down "${iface}"
ports=$( bridge_get_ports "${iface}" )
deletebridge=true
eindent
else
# Work out if we're added to a bridge for removal or not
ports="${iface}"
iface=$( bridge_get_bridge "${iface}" )
[[ -z ${iface} ]] && return 0
extra=" from ${iface}"
fi
for i in ${ports}; do
ebegin "Removing port ${i}${extra}"
bridge_delete_port "${iface}" "${i}"
eend $?
done
if ${deletebridge} ; then
eoutdent
brctl delbr "${iface}" &>/dev/null
eend 0
fi
return 0
}
# vim:ts=4
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