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os exercies4
- 写一个扩展到linux防火墙,这使得它成为可能 指定允许哪些程序使用哪个传出端口。 更确切地说,用户空间程序和内核 模块。(Write an extension to the linux firewall which makes it possible to specify which programs are allowed use which outgoing port. More precisely, write a user space program and a