lua 判断 ip 是否为局域网 ip

openresty 获取 client ip

来源：https://stackoverflow.com/questions/42140346/get-client-ip-address-with-nginx-lua

local ip = ngx.var.remote_addr;

判断IP是否为局域网网段

来源：https://blog.csdn.net/modstartcms/article/details/128914573

function is_lan_ip(ip)
  -- Split the IP address into its octets
  local octets = {}
  for octet in ip:gmatch("%d+") do
    table.insert(octets, tonumber(octet))
  end

  -- Check if the IP is in the range of private IP addresses
  if octets[1] == 10 then
    return true
  elseif octets[1] == 172 and octets[2] >= 16 and octets[2] <= 31 then
    return true
  elseif octets[1] == 192 and octets[2] == 168 then
    return true
  else
    return false
  end
end

调用

print(is_lan_ip("192.168.1.1")) -- true
print(is_lan_ip("8.8.8.8")) -- false