#!/bin/sh
# update-dns.sh
# 从 /private/argus/etc/dns.conf 读取 IP，写入 /etc/resolv.conf

DNS_CONF="/private/argus/etc/dns.conf"
RESOLV_CONF="/etc/resolv.conf"

# 检查配置文件是否存在
if [ ! -f "$DNS_CONF" ]; then
  echo "配置文件不存在: $DNS_CONF" >&2
  exit 1
fi

# 生成 resolv.conf 内容
{
  while IFS= read -r ip; do
    # 跳过空行和注释
    case "$ip" in
      \#*) continue ;;
      "") continue ;;
    esac
    echo "nameserver $ip"
  done < "$DNS_CONF"
} > "$RESOLV_CONF".tmp

# 替换写入 /etc/resolv.conf
cat "$RESOLV_CONF".tmp > "$RESOLV_CONF"
rm -f "$RESOLV_CONF".tmp

echo "已更新 $RESOLV_CONF"