Get IP address from socket descriptor?

I've opened a TCP socket server (I've omitted a few stuff, it is taken from [here][1]

sockfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol))

Is it possible to get the IP address of the server from sockfd? If not where should I look?

EDIT: I want to know the address of the server (this is before any client connects).

[1]:

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You can't use the socket to get the server's address before a client connects, because it isn't known.

In principle, a host may have multiple IPs. The IP used for a connection to a server is the one belonging to the interface, through which the connection arrived. Until a connection arrives, it isn't known.
Even if you have only one IP, connections may arrive from within the machine, in which case the address would be `127.0.0.1`.

So the listening socket has no information about the IP.
You'll need to find what interfaces the machine has, and what's their IPs.

If you want to know who's at the other end of your socket you can use [getpeername][1] in Linux. [getsockname][2] will tell you who you are. You decide what address you want your server to sit on initially though, at [bind][3] time.

You may also find this SO question useful:

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And the book "Unix Network Programming, vol 1", by W. Richard Stevens.

[1]:

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[2]:

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[3]:

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The address of the server is the one that was passed to the successfull call to `bind()` (as shown in the source you linked).

The address of the server is up to you.

Depends on which parameters are passed to the `bind()` function.

You can specify a `single ip` or bind your socket to every address of your host.

Look at the [Bind man page][1]


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