imx6ul_Linux移植ifplugd

一、ifplugd简介

ifplugd（Interface Plug Daemon）是一个轻量级的 网络接口状态监控守护进程，主要用于检测以太网（Ethernet）接口的物理连接状态（如网线插拔事件），并自动触发相应的网络配置操作（如启动/关闭接口、重新获取IP等）。

二、源码下载

https://0pointer.de/lennart/projects/libdaemon/libdaemon-0.14.tar.gz

GitHub - thingnario/ifplugd-0.28: ifplugd for network hot plug detect

三、交叉移植

root@ubuntu:~/ifplug# tar -xvf libdaemon-0.14.tar.gz
root@ubuntu:~/ifplug# unzip ifplugd-0.28-master.zip 
root@ubuntu:~/ifplug# cd libdaemon-0.14/
root@ubuntu:~/ifplug/libdaemon-0.14# ./configure --host=arm-fsl-linux-gnueabi --prefix=$(pwd)/__install ac_cv_func_setpgrp_void=yes
root@ubuntu:~/ifplug/libdaemon-0.14# make
root@ubuntu:~/ifplug/libdaemon-0.14# make install
root@ubuntu:~/ifplug/libdaemon-0.14# cd __install/
root@ubuntu:~/ifplug/libdaemon-0.14/__install# tar -cjvf libdaemon.tar.bz2 *
root@ubuntu:~/ifplug/libdaemon-0.14# cd ../
root@ubuntu:~/ifplug# cd ifplugd-0.28-master/
root@ubuntu:~/ifplug/ifplugd-0.28-master#cp ../libdaemon-0.14/pkgconfig/ //opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/lib -r
root@ubuntu:~/ifplug#export PKG_CONFIG_PATH=/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/lib/pkgconfig/
root@ubuntu:~/ifplug/ifplugd-0.28-master# sed -i 's/-R/-Wl,-rpath=/g' src/Makefile
root@ubuntu:~/ifplug/ifplugd-0.28-master# ./configure --host=arm-fsl-linux-gnueabi             CC=arm-fsl-linux-gnueabi-gcc             --prefix=$(pwd)/__install             LDFLAGS="-L/root/ifplug/libdaemon-0.14/__install/lib/"             CPPFLAGS="-I/root/ifplug/libdaemon-0.14/__install/include"
root@ubuntu:~/ifplug/ifplugd-0.28-master# vi config.h

将#define malloc rpl_malloc修改为#define malloc malloc

root@ubuntu:~/ifplug/ifplugd-0.28-master# make
root@ubuntu:~/ifplug/ifplugd-0.28-master# make install
root@ubuntu:~/ifplug/ifplugd-0.28-master# cd __install/
root@ubuntu:~/ifplug/ifplugd-0.28-master/__install# tar -cjvf libifplug.tar.bz2 *

将libifplug.tar.bz2和libdaemon.tar.bz2拷贝至文件系统解压

root@freescale ~$ tar -xvf /media/sda1/sdrun/libifplug.tar.bz2 -C /
root@freescale ~$ tar -xvf /media/sda1/sdrun/libdaemon.tar.bz2 -C /
root@freescale /media/sda1$ rm /usr/bin/ifplugd

四、测试

编译执行脚本（下面脚本执行时要等完全执行完之后再进行插拔，具体是哪一句有阻塞）

root@freescale ~$ vi /etc/network/if.sh

#!/bin/sh
echo "if1.sh"
echo $#
echo $0
echo $1
echo $2

if [ $# -eq 2 ]; then
   if [ "$1" = "eth0" ]; then
      echo -n "eth0 "
   fi

   if [ "$2" = "up" ]; then
      echo "up"
      # ..........................................
      /sbin/ifconfig "$1" up
#      [ -x /sbin/dhclient ] && /sbin/dhclient "$1"

       [ -x /sbin/udhcpc ] && /sbin/udhcpc -r "$1"
  elif [ "$2" = "down" ]; then
      echo "down"
      # ..........................................
      [ -x /sbin/udhcpc ] && /sbin/udhcpc -r "$1"
      /sbin/ifconfig "$1" down
   fi
fi

# ........................
exit 0

root@freescale ~$ vi /etc/network/interfaces
(只测试eth0，其他的参考修改即可)
# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)

# The loopback interface
auto lo
iface lo inet loopback

# Wired or wireless interfaces
#auto eth0
allow-hotplug eth0
iface eth0 inet dhcp

#address 192.168.0.232
#netmask 255.255.255.0
#gateway 192.168.0.1
#broadcast 192.168.0.255

auto eth1
iface eth1 inet static
address 192.168.1.232
netmask 255.255.255.0
gateway 192.168.1.1
broadcast 192.168.1.255

给脚本权限并测试

root@freescale ~$ chmod 777 /etc/network/if.sh
root@freescale ~$ ifplugd   -i eth0 -r /etc/network/if.sh

此时插拔eth0会自动分配ip

注：经测试usb转以太网模块如果拔掉usb的话ifplugd进程会掉，再重新插上也不能实现上述功能

为实现上述功能，我们可以添加udev规则，检测usb和网络节点去实现该功能，实现原理就是检测到usb和网络节点之后去执行ifplugd守护进程。（此处我将原生网口在设备树关闭掉，所以eth0是usb转以太网的节点，udev规则也是去检测的eth0网络节点）

udev规则如下

root@freescale ~$ cat /etc/udev/rules.d/99-usb-net.rules
ACTION=="add", SUBSYSTEM=="net", KERNEL=="eth0", \
    SUBSYSTEMS=="usb", \
    RUN+="/bin/sh -c '/root/a.sh &'"

udev规则执行的脚本a.sh如下

root@freescale ~$ cat a.sh
#/bin/bash
#!/bin/bash

sleep 1
echo "55555555555555555555" > /dev/ttymxc0
#echo "启动 ifplugd 监控 eth0..." >> /var/log/ifplugd.log
#exec /sbin/ifplugd -i eth0 -f -u0 -d10 -I -q -m auto -r /etc/network/if.sh &
ifplugd   -i eth0 -r /etc/network/if.sh &
echo "66666666666" > /dev/ttymxc0
exit 0

ifplugd执行的脚本/etc/network/if.sh如下

root@freescale ~$ cat /etc/network/if.sh
#!/bin/sh
echo "if1.sh"
echo $#
echo $0
echo $1
echo $2

if [ $# -eq 2 ]; then
   if [ "$1" = "eth0" ]; then
      echo -n "eth0 "
   fi

   if [ "$2" = "up" ]; then
      echo "up"
      # 添加实际网络启动命令（示例）
      /sbin/ifconfig "$1" up
#      [ -x /sbin/dhclient ] && /sbin/dhclient "$1"

       [ -x /sbin/udhcpc ] && /sbin/udhcpc -r "$1"
  elif [ "$2" = "down" ]; then
      echo "down"
      # 添加实际网络关闭命令（示例）
      [ -x /sbin/udhcpc ] && /sbin/udhcpc -r "$1"
      /sbin/ifconfig "$1" down
   fi
fi

# 明确返回成功状态
exit 0

此时发现无论是插拔网线还是usb口都可以实现网络节点eth0能够重新自动分配ip