lldpd启动脚本分析

#!/bin/sh /etc/rc.common

# Copyright (C) 2008-2012 OpenWrt.org

#启动顺序

START=90

#创建PID文件

SERVICE_USE_PID=1

find_release_info()

{

　　  [ -s /etc/openwrt_release ] && . /etc/openwrt_release

[ -z "$DISTRIB_DESCRIPTION" ] && [ -s /etc/openwrt_version ] && \

DISTRIB_DESCRIPTION="$(cat /etc/openwrt_version)"

echo "${DISTRIB_DESCRIPTION:-Unknown OpenWrt release} @ $(cat /proc/sys/kernel/hostname)"

}

# 启动

start() {

#需要调用network.sh中的函数，因此加载文件

. /lib/functions/network.sh

#定义变量

local enable_cdp

local enable_fdp

local enable_sonmp

local enable_edp

local lldp_class

local lldp_location

local lldp_description

#需要从/etc/config/lldpd配置文件中取变量，因此加载文件

config_load 'lldpd'

#从配置文件中将变量读出

config_get_bool enable_cdp 'config' 'enable_cdp' 0

config_get_bool enable_fdp 'config' 'enable_fdp' 0

config_get_bool enable_sonmp 'config' 'enable_sonmp' 0

config_get_bool enable_edp 'config' 'enable_edp' 0

config_get lldp_class 'config' 'lldp_class'

config_get lldp_location 'config' 'lldp_location'

config_get lldp_description 'config' 'lldp_description' "$(find_release_info)"

local ifaces

config_get ifaces 'config' 'interface'

local iface

for iface in $ifaces; do

local ifname=""

if network_get_device ifname "$iface" || [ -e "/sys/class/net/$iface" ]; then

append args "-I ${ifname:-$iface}"

fi

done

[ $enable_cdp -gt 0 ] && append args '-c'

[ $enable_fdp -gt 0 ] && append args '-f'

[ $enable_sonmp -gt 0 ] && append args '-s'

[ $enable_edp -gt 0 ] && append args '-e'

user_exists  lldp 121 || user_add  lldp 121 129

group_exists lldp 129 || group_add lldp 129

#创建文件夹，并加权限

mkdir -p /var/run/lldp

chown lldp:lldp /var/run/lldp

#拉起进程

service_start /usr/sbin/lldpd $args \

${lldp_class:+ -M $lldp_class} \

${lldp_description:+ -S "$lldp_description"}

[ -n "$lldp_location" ] && {

sleep 1

/usr/sbin/lldpctl -L "$lldp_location" > /dev/null 2>&1

}

}

#停止

stop()

{

service_stop /usr/sbin/lldpd

rm -f /var/run/lldpd.socket /var/run/lldpd.pid

}