#过年不停更# OpenHarmony 网络-通过第三方库实现IP自动配置(L2) 原创

【春节不停更，此文正在参加「星光计划-春节更帖活动」】

@toc

简介

OpenHarmony3.0的Hi3516DV300目前插上网线不能上网，需要配置网络。

手动配置

具体的IP地址要根据自己实际情况确定。更详细操作可以参考：https://harmonyos.51cto.com/posts/10210

• 配IP和子网掩码
  ifconfig eth0 192.168.1.200 netmask 255.255.255.0
• 配网关
  route add default gw 192.168.1.1
• 启动网卡
  ifconfig eth0 up
• DNS配置
  第一步：由于当前版本/etc 目录没有写入权限，需要手动开放写入权限。
  mount -o remount,rw /
  第二步：添加resolv.conf
  echo “nameserver 114.114.114.114” > /etc/resolv.conf

动态获取

动态获取用到第三方组件toybox, 需要把其dhcp功能开放出来。

代码修改

• 修改third_party/toybox/BUILD.gn

  import("//build/ohos.gni") # L2的分支

  ohos_executable("toybox") {
	...
	"toys/pending/dhcp.c", # dhcp 添加到toybox编译中去
	...
  }
  ...
  symlink_target_name = [
	...
	"dhcp", # 添加dhcp到toybox的链接
	...
  ]

• 修改third_party/toybox/generated/config.h

// 修改前
#define CFG_DHCP 0
#define USE_DHCP(...)
// 修改后
#define CFG_DHCP 1
#define USE_DHCP(...) __VA_ARGS__

• 修改third_party/toybox/generated/flags.h

// 修改前
#ifndef TT
#define TT this.dhcp
#endif
#define FLAG_f (FORCED_FLAG<<0)
#define FLAG_b (FORCED_FLAG<<1)
#define FLAG_n (FORCED_FLAG<<2)
#define FLAG_q (FORCED_FLAG<<3)
#define FLAG_v (FORCED_FLAG<<4)
#define FLAG_o (FORCED_FLAG<<5)
#define FLAG_a (FORCED_FLAG<<6)
#define FLAG_C (FORCED_FLAG<<7)
#define FLAG_R (FORCED_FLAG<<8)
#define FLAG_B (FORCED_FLAG<<9)
#define FLAG_S (FORCED_FLAG<<10)
#define FLAG_i (FORCED_FLAG<<11)
#define FLAG_p (FORCED_FLAG<<12)
#define FLAG_s (FORCED_FLAG<<13)
#define FLAG_t (FORCED_FLAG<<14)
#define FLAG_T (FORCED_FLAG<<15)
#define FLAG_A (FORCED_FLAG<<16)
#define FLAG_O (FORCED_FLAG<<17)
#define FLAG_r (FORCED_FLAG<<18)
#define FLAG_x (FORCED_FLAG<<19)
#define FLAG_F (FORCED_FLAG<<20)
#define FLAG_H (FORCED_FLAG<<21)
#define FLAG_V (FORCED_FLAG<<22)
#endif

// 修改后
#ifndef TT
#define TT this.dhcp
#endif
#define FLAG_f (1<<0)
#define FLAG_b (1<<1)
#define FLAG_n (1<<2)
#define FLAG_q (1<<3)
#define FLAG_v (1<<4)
#define FLAG_o (1<<5)
#define FLAG_a (1<<6)
#define FLAG_C (1<<7)
#define FLAG_R (1<<8)
#define FLAG_B (1<<9)
#define FLAG_S (1<<10)
#define FLAG_i (1<<11)
#define FLAG_p (1<<12)
#define FLAG_s (1<<13)
#define FLAG_t (1<<14)
#define FLAG_T (1<<15)
#define FLAG_A (1<<16)
#define FLAG_O (1<<17)
#define FLAG_r (1<<18)
#define FLAG_x (1<<19)
#define FLAG_F (1<<20)
#define FLAG_H (1<<21)
#define FLAG_V (1<<22)
#endif

• 编译：

./build.sh --product-name Hi3516DV300 --ccache

• 编译结束后重新烧写系统

脚本准备

• 修改系统权限，目录能读能写:

mount -o remount,rw /

• 发送脚本
  将default.script放入开发板/system/bin/的目录下,default.script见附件:

hdc_std.exe file send default.script /system/bin

• 修改default.script的权限为可执行权限

chmod 0711 /system/bin/default.script

执行命令，进行动态IP获取。

ifconfig eth0 up
dhcp -i eth0 -s /system/bin/default.script

获取成功后，即可联网