问题
I would like to fetch the IP address and port number of an incoming TCP/IP connection. Unfortunately gen_tcp's accept and recv functions only give back a socket, while gen_udp's recv function also gives back the address information. Is there a straightforward way to collect address information belonging to a socket in Erlang?
回答1:
You need inet/peername 1. From the Erlang inet docs:
peername(Socket) -> {ok, {Address, Port}} | {error, posix()}
Types:
Socket = socket() Address = ip_address() Port = int()
Returns the address and port for the other end of a connection.
来源：https://stackoverflow.com/questions/1240312/determining-ip-address-and-port-of-an-incoming-tcp-ip-connection-in-erlang