ruby - 使 Ruby 服务器在端口 80 上工作

Question

我正在用 Ruby 创建一个简单的 Web 服务器，它在浏览器中显示文本 LOLZ。我现在有这个:

#!/usr/bin/ruby
require 'socket'

server = TCPServer.open(2000)
loop do

client = server.accept
client.puts "HTTP/1.1 200 OK\r\n"
client.puts "Content-type: text/plain\r\n"
client.puts "\r\n"
client.puts "LOLZ"
client.close

end

这按预期工作。但是，我希望它在端口 80 上工作。每当我将 2000 更改为 80，并使用 bash 启动服务器时，我都会收到此错误:

unknown-00-25-4b-8c-b9-b3:rServe koningbaardxiv$ ./rServe.rb
    ./rServe.rb:4:in `initialize': Permission denied - bind(2) (Errno::EACCES)
        from ./rServe.rb:4:in `open'
        from ./rServe.rb:4

谁能帮帮我？谢谢

编辑:我刚刚发现这适用于 0 到 999 范围内的所有端口:S

Answer 1

1024以下的端口是保留的(也叫知名端口)。您只能以 root 身份访问它们。

$ sudo ./rServe.rb

---

来自 http://www.iana.org/assignments/port-numbers :

The port numbers are divided into three ranges: the Well Known Ports, the Registered Ports, and the Dynamic and/or Private Ports.

The Well Known Ports are those from 0 through 1023.

来自 http://www.linuxquestions.org/linux/articles/Technical/Why_can_only_root_listen_to_ports_below_1024 :

I do not blame those who invented the port 1024 limit, it was a natural and important security feature given how UNIX machines were used in the 1970's and 1980's. A typical UNIX machine allowed a bunch of not necessarily fully trusted people to log in and do stuff. You don't want these untrusted users to be able to install a custom daemon pretending to be a well-known service such as telnet or ftp since that could be used to steal passwords and other nasty things.