dhcpcd 移植

/************************************************************************
 *                             dhcpcd移植
 * dhcpcd是DHCP client的实现，可以作为后台守护进程运行。
 * 本文介绍移植过程，其中的配置文件并没有深究。
 * 参考链接:
 *     http://www.cnblogs.com/zengjfgit/p/5435126.html
 *     https://wiki.archlinux.org/index.php/Dhcpcd#Running
 *     http://www.linuxfromscratch.org/blfs/view/svn/basicnet/dhcpcd.html
 *                                                          
 *                                                Tony, 2016-5-4,Shenzhen
 ***********************************************************************/
1.下载
    ftp://roy.marples.name/pub/dhcpcd
    我下载的版本是：dhcpcd-6.9.4.tar.xz

2.编译
    解压压缩包 

    ./configure --libexecdir=/lib/dhcpcd --dbdir=/var/lib/dhcpcd

    make CC=arm-linux-gnueabihf-gcc

3.移植
    1. 编译生成的dhcpcd添加到板中

    2. dhcpcd.conf添加到/etc目录 

    3. 将dhcpcd-run-hooks脚本添加到开发板/lib/dhcpcd/中。
       dhcpcd-hooks目录及其内容移动到放到开发板/lib/dhcpcd/目录.
       dhcpcd-run-hooks脚本运行时会调用dhcpcd-hooks中的脚本。

4.运行
    dhcpcd 
    会保持在后台运行。重新插上网线，就能够获取ip。

5.存在问题
5.1 电脑网卡和板子直连，运行dhcpcd也会配置ip
    电脑网卡ip:192.168.2.110
    root@tony:# dhcpcd  
    control_open: Connection refused
    all: IPv6 kernel autoconf disabled
    eth0: IPv6 kernel autoconf disabled
    eth0: adding address fe80::6eec:ebff:fef9:1731
    if_addaddress6: Operation not supported
    script_runreason: /lib/dhcpcd/dhcpcd-run-hooks: WEXITSTATUS 127
    script_runreason: /lib/dhcpcd/dhcpcd-run-hooks: WEXITSTATUS 127
    DUID 00:01:00:01:1c:62:04:1e:6c:ec:eb:f9:17:31
    eth0: IAID eb:f9:17:31
    eth0: soliciting a DHCP lease
    eth0: probing for an IPv4LL address
    eth0: using IPv4LL address 169.254.144.185
    eth0: adding route to 169.254.0.0/16
    eth0: adding default route
    script_runreason: /lib/dhcpcd/dhcpcd-run-hooks: WEXITSTATUS 127
    forked to background, child pid 1922
    root@tony:# ifconfig
    eth0      Link encap:Ethernet  HWaddr 6C:EC:EB:F9:17:31  
              inet addr:169.254.144.185  Bcast:169.254.255.255  Mask:255.255.0.0
              UP BROADCAST RUNNING ALLMULTI MULTICAST  MTU:1500  Metric:1
              RX packets:1142 errors:0 dropped:0 overruns:0 frame:0
              TX packets:578 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:310397 (303.1 KiB)  TX bytes:70897 (69.2 KiB)
    
    lo        Link encap:Local Loopback  
              inet addr:127.0.0.1  Mask:255.0.0.0
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:32421 errors:0 dropped:0 overruns:0 frame:0
              TX packets:32421 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:549649752 (524.1 MiB)  TX bytes:549649752 (524.1 MiB)
    
5.2 dhcpcd eth0 
    这样启动的时候，如果没有连接网线，会导致dhcpcd配置超时，启动失败,程序退出。
    root@tony:# dhcpcd eth0    
    control_open: Connection refused
    all: IPv6 kernel autoconf disabled
    eth0: IPv6 kernel autoconf disabled
    eth0: adding address fe80::6eec:ebff:fef9:1731
    if_addaddress6: Operation not supported
    script_runreason: /lib/dhcpcd/dhcpcd-run-hooks: WEXITSTATUS 127
    script_runreason: /lib/dhcpcd/dhcpcd-run-hooks: WEXITSTATUS 127
    eth0: waiting for carrier
    timed out
    dhcpcd exited