IPSocket is the super class of TCPSocket and UDPSocket.

Methods
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Class Public methods
IPSocket.getaddress(host) => ipaddress

Lookups the IP address of host.

IPSocket.getaddress("localhost")     #=> "127.0.0.1"
IPSocket.getaddress("ip6-localhost") #=> "::1"
Also aliased as: getaddress_orig

Source: show 

static VALUE
ip_s_getaddress(VALUE obj, VALUE host)
{
    struct sockaddr_storage addr;
    struct addrinfo *res = rsock_addrinfo(host, Qnil, SOCK_STREAM, 0);

    /* just take the first one */
    memcpy(&addr, res->ai_addr, res->ai_addrlen);
    freeaddrinfo(res);

    return rsock_make_ipaddr((struct sockaddr*)&addr);
}
Instance Public methods
ipsocket.addr([reverse_lookup]) => [address_family, port, hostname, numeric_address]

Returns the local address as an array which contains address_family, port, hostname and numeric_address.

If reverse_lookup is true or :hostname, hostname is obtained from numeric_address using reverse lookup. Or if it is false, or :numeric, hostname is same as numeric_address. Or if it is nil or ommitted, obeys to ipsocket.do_not_reverse_lookup. See Socket.getaddrinfo also.

TCPSocket.open("www.ruby-lang.org", 80) {|sock|
  p sock.addr #=> ["AF_INET", 49429, "hal", "192.168.0.128"]
  p sock.addr(true)  #=> ["AF_INET", 49429, "hal", "192.168.0.128"]
  p sock.addr(false) #=> ["AF_INET", 49429, "192.168.0.128", "192.168.0.128"]
  p sock.addr(:hostname)  #=> ["AF_INET", 49429, "hal", "192.168.0.128"]
  p sock.addr(:numeric)   #=> ["AF_INET", 49429, "192.168.0.128", "192.168.0.128"]
}

Source: show 

static VALUE
ip_addr(int argc, VALUE *argv, VALUE sock)
{
    rb_io_t *fptr;
    struct sockaddr_storage addr;
    socklen_t len = (socklen_t)sizeof addr;
    int norevlookup;

    GetOpenFile(sock, fptr);

    if (argc < 1 || !rsock_revlookup_flag(argv[0], &norevlookup))
        norevlookup = fptr->mode & FMODE_NOREVLOOKUP;
    if (getsockname(fptr->fd, (struct sockaddr*)&addr, &len) < 0)
        rb_sys_fail("getsockname(2)");
    return rsock_ipaddr((struct sockaddr*)&addr, norevlookup);
}
getaddress(s)

Returns a String based representation of a valid DNS hostname, IPv4 or IPv6 address.

IPSocket.getaddress 'localhost'         #=> "::1"
IPSocket.getaddress 'broadcasthost'     #=> "255.255.255.255"
IPSocket.getaddress 'www.ruby-lang.org' #=> "221.186.184.68"
IPSocket.getaddress 'www.ccc.de'        #=> "2a00:1328:e102:ccc0::122"

Source: show | on GitHub 

# File lib/ipaddr.rb, line 650
def getaddress(s)
  if valid_v6?(s)
    s
  else
    getaddress_orig(s)
  end
end
ipsocket.peeraddr([reverse_lookup]) => [address_family, port, hostname, numeric_address]

Returns the remote address as an array which contains address_family, port, hostname and numeric_address. It is defined for connection oriented socket such as TCPSocket.

If reverse_lookup is true or :hostname, hostname is obtained from numeric_address using reverse lookup. Or if it is false, or :numeric, hostname is same as numeric_address. Or if it is nil or ommitted, obeys to ipsocket.do_not_reverse_lookup. See Socket.getaddrinfo also.

TCPSocket.open("www.ruby-lang.org", 80) {|sock|
  p sock.peeraddr #=> ["AF_INET", 80, "carbon.ruby-lang.org", "221.186.184.68"]
  p sock.peeraddr(true)  #=> ["AF_INET", 80, "carbon.ruby-lang.org", "221.186.184.68"]
  p sock.peeraddr(false) #=> ["AF_INET", 80, "221.186.184.68", "221.186.184.68"]
  p sock.peeraddr(:hostname) #=> ["AF_INET", 80, "carbon.ruby-lang.org", "221.186.184.68"]
  p sock.peeraddr(:numeric)  #=> ["AF_INET", 80, "221.186.184.68", "221.186.184.68"]
}

Source: show 

static VALUE
ip_peeraddr(int argc, VALUE *argv, VALUE sock)
{
    rb_io_t *fptr;
    struct sockaddr_storage addr;
    socklen_t len = (socklen_t)sizeof addr;
    int norevlookup;

    GetOpenFile(sock, fptr);

    if (argc < 1 || !rsock_revlookup_flag(argv[0], &norevlookup))
        norevlookup = fptr->mode & FMODE_NOREVLOOKUP;
    if (getpeername(fptr->fd, (struct sockaddr*)&addr, &len) < 0)
        rb_sys_fail("getpeername(2)");
    return rsock_ipaddr((struct sockaddr*)&addr, norevlookup);
}
ipsocket.recvfrom(maxlen) => [mesg, ipaddr] ipsocket.recvfrom(maxlen, flags) => [mesg, ipaddr]

Receives a message and return the message as a string and an address which the message come from.

maxlen is the maximum number of bytes to receive.

flags should be a bitwise OR of Socket::MSG_* constants.

ipaddr is same as IPSocket#{peeraddr,addr}.

u1 = UDPSocket.new
u1.bind("127.0.0.1", 4913)
u2 = UDPSocket.new
u2.send "uuuu", 0, "127.0.0.1", 4913
p u1.recvfrom(10) #=> ["uuuu", ["AF_INET", 33230, "localhost", "127.0.0.1"]]

Source: show 

static VALUE
ip_recvfrom(int argc, VALUE *argv, VALUE sock)
{
    return rsock_s_recvfrom(sock, argc, argv, RECV_IP);
}