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The SOCKET is the socket handle created by the socket function, and NAME is the scalar holding the sockaddr_in structure with the remote host and service port information Armed with this function, you can create quite complex systems for communicating information over UDP, TCP, or any other protocol As an example, here s a simple script for obtaining the remote time of a host, providing it supports the daytime protocol (on service port 13):
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use Ssockets; my $host = shift || 'localhost'; unless(connectsocket(*TIME, $host, 'daytime', 'tcp')) { die $Ssockets::error; } $_ = <TIME>; print "Time on $host is $_"; close(TIME);
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For convenience the connectsocket function has been inserted into its own package, Ssockets This is actually the module used in 5 of the Perl Annotated Archives book (see Web Appendix A at wwwosbornecom)
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The daytime protocol is pretty straightforward The moment you connect, it sends back the current, localized date and time of the remote machine All you have to do is connect to the remote host and then read the supplied information from the associated network socket
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The process of listening on a network socket for new connections is more involved than creating a client socket, although the basic principles remain constant Beyond the creation of the socket, you also need to bind the socket to a local address and service port, and set the socket to the listen state The full process is therefore as follows: 1 Create and open a local socket, specifying the protocol family (PF_INET or PF_UNIX), socket type, and top-level protocol number (TCP, UDP, etc) 2 Determine the local service port number on which you want to listen for new connections 3 Set any options for the newly created socket 4 Bind the socket to an IP address and service port on the local machine 5 Set the socket to the listen state, specifying the size of the queue used to hold pending connections You don t initiate any connections or, at this stage, actually accept any connections We ll deal with that part later Again, it s easier to produce a simple function to do this for you, and the listensocket function that follows is the sister function to the earlier connectsocket:
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use Socket; sub listensocket { my ($SOCKETHANDLE, $service_name, $protocol_name, $queuelength) = @_; my ($port_num, $sock_type, $protocol_num, $local_socket); $protocol_num = (getprotobyname($protocol_name))[2]; unless ($protocol_num) { $error = "Couldn't find protocol $protocol_name"; return; } $sock_type = $protocol_name eq "tcp" SOCK_STREAM : SOCK_DGRAM ;
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12:
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if( $service_name =~ /^\d+$/) { $port_num = $service_name; } else { $port_num = (getservbyname($service_name, $protocol_name))[2]; unless($port_num) { $error = "Can't find service $service_name"; return; } } unless(socket($SOCKETHANDLE, PF_INET, $sock_type, $protocol_num)) { $error = "Couldn't create a socket: $!"; return; } unless(setsockopt($SOCKETHANDLE,SOL_SOCKET, SO_REUSEADDR,pack("l",1))) { $error = "Couldn't set socket options: $!"; return; } $local_socket = sockaddr_in($port_num, INADDR_ANY); unless(bind($SOCKETHANDLE, $local_socket)) { $error = "Failed to Bind to socket: $!"; return; } unless(listen($SOCKETHANDLE, $queuelength)) { $error = "Couldn't listen on socket: $!"; return; } return(1); }
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Again, the bulk of this function is given over to determining the numerical versions of the IP addresses, protocols, and service ports that you want to use Most of the function is therefore identical to the connectsocket function The only difference is the
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setting of some socket options, which we ll return to later in this chapter, and the use of the bind and listen functions The bind function attaches your newly created socket to a local IP interface and service port This is essentially the same as the connect function used to connect to a remote port, except that you are attaching the socket to a local port instead
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