From https://wiki.imciel.com/sandry/openwrt%E4%B8%ADshadowsocks%E6%89%B9%E9%87%8F%E6%B7%BB%E5%8A%A0%E6%9C%8D%E5%8A%A1%E5%99%A8

openwrt_add_shadowsocks_servers

#!/bin/sh

NAME=shadowsocks
SERVERS=servers
dns="119.29.29.29"

uci_set_by_type() {
  uci set $NAME.$1.$2=$3 2>/dev/null
}

# 根据参数，通过 UCI 添加 server 配置并设置内容
uci_add_ss_server() {
  new_id=$(uci add $NAME $SERVERS)
  while getopts "s:p:k:m:a:d:" o
  do
    case "${o}" in
      s)
        uci_set_by_type $new_id server $OPTARG
        ;; 
      p)
        uci_set_by_type $new_id server_port $OPTARG
        ;; 
      k)
        uci_set_by_type $new_id password $OPTARG
        ;; 
      m)
        uci_set_by_type $new_id encrypt_method $OPTARG
        ;; 
      a)
        uci_set_by_type $new_id auth $OPTARG
        ;; 
      d)
        uci_set_by_type $new_id alias $OPTARG
        ;; 
      *)
        echo "illegal parameters!"
        exit 1;
        ;; 
    esac
  done
}

# 根据域名和子域名列表，以及密码，端口，加密方式和 OTA 选项批量添加设置
add_server() {
  while getopts "r:s:p:k:m:a:" o
  do
    case "${o}" in
      r)
        root_domain=$OPTARG
        ;; 
      s)
        s_domain=$OPTARG
        ;; 
      p)
        port=$OPTARG
        ;; 
      k)
        password=$OPTARG
        ;; 
      m)
        encrypt_method=$OPTARG
        ;; 
      a)
        auth=$OPTARG
        ;; 
      *)
        echo "illegal parameters!"
        exit 1;
        ;; 
    esac
  done

  domains=$(echo $s_domain | tr ' ' '\n')

  echo "$domains" | while read p
  do
    domain="$p.$root_domain"
    ip="$(echo "$(dig $domain '@'$dns +short | grep "^[0-9]")")"
    echo "$domain ip $ip"
    uci_add_ss_server -s $ip -p $port -k $password -m $encrypt_method -a $auth -d $domain
  done
}

# 删除所有现有 servers 配置
delete_all_servers() {
  while true
  do
    local config=$(uci get $NAME.@servers[0] 2>/dev/null)
    if [ "${config}x" == "x" ];then
      break
    else
      uci delete $NAME.@servers[0]
    fi
  done
}

delete_all_servers
# r 为域名，s 为子域名，空格格开，后面依次是端口，密码，加密方式和 OTA 选项（开启为1，不开启为 0）
add_server -r "domain.com" -s "hk1 tw1 kr1" -p 11111 -k 2222222 -m 'rc4-md5' -a 1

# 提交更改
uci commit shadowsocks