为什么不能仅将Linux服务绑定到环回? [英] Why can't a bind linux service to the loop-back only?

问题描述

我正在编写一个服务器应用程序，该应用程序将在临时端口上提供服务，而我仅希望在环回接口上对其进行访问.为此，我正在编写如下代码:

I am writing a server application that will provide a service on an ephemeral port that I only want accessible on the loopback interface. In order to do this, I am writing code like the following:

struct sockaddr_in bind_addr;

memset(&bind_addr,0,sizeof(bind_addr));
bind_addr.sin_family = AF_INET;
bind_addr.sin_port = 0;
bind_addr.sin_addr.s_addr = htonl(inet_addr("127.0.0.1"));
rcd = ::bind(
   socket_handle,
   reinterpret_cast<struct sockaddr *>(&bind_addr),
   sizeof(bind_addr));

此对bind()的调用的返回值为-1，而errno的值为99(无法分配请求的地址).是因为inet_addr()已经按网络顺序返回其结果而失败，还是有其他原因?

The return value for this call to bind() is -1 and the value of errno is 99 (Cannot assign requested address). Is this failing because inet_addr() already returns its result in network order or is there some other reason?

推荐答案

失败是因为inet_addr()已经按网络顺序返回了结果

Is this failing because inet_addr() already returns its result in network order

是的

因此删除htonl调用.

So remove the htonl call.

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