クライアント/サーバ通信

TCP クライアントの例を示します。

($them,$port) = @ARGV;
$port = 2345 unless $port;
$them = 'localhost' unless $them;

$SIG{'INT'} = 'dokill';
sub dokill { kill 9,$child if $child; }

use Socket;

$sockaddr = 'S n a4 x8';
chop($hostname = `hostname`);

($name, $aliases, $proto) = getprotobyname('tcp');
($name, $aliases, $port) = getservbyname($port, 'tcp')
    unless $port =~ /^\d+$/;
($name, $aliases, $type, $len, $thisaddr) =
                gethostbyname($hostname);
($name, $aliases, $type, $len, $thataddr) = gethostbyname($them);

$this = pack($sockaddr, &AF_INET, 0, $thisaddr);
$that = pack($sockaddr, &AF_INET, $port, $thataddr);

socket(S, &PF_INET, &SOCK_STREAM, $proto) || die "socket: $!";
bind(S, $this) || die "bind: $!";
connect(S, $that) || die "connect: $!";

select(S); $| = 1; select(stdout);

if ($child = fork) {
    while (<>) {
        print S;
    }
    sleep 3;
    do dokill();
}
else {
    while (<S>) {
        print;
    }
}

そしてサーバです:

($port) = @ARGV;
$port = 2345 unless $port;

use Socket;

$sockaddr = 'S n a4 x8';

($name, $aliases, $proto) = getprotobyname('tcp');
($name, $aliases, $port) = getservbyname($port, 'tcp')
    unless $port =~ /^\d+$/;

$this = pack($sockaddr, &AF_INET, $port, "\0\0\0\0");

select(NS); $| = 1; select(stdout);

socket(S, &PF_INET, &SOCK_STREAM, $proto) || die "socket: $!";
bind(S, $this) || die "bind: $!";
listen(S, 5) || die "connect: $!";

select(S); $| = 1; select(stdout);

for (;;) {
    print "Listening again\n";
    ($addr = accept(NS,S)) || die $!;
    print "accept ok\n";

    ($af,$port,$inetaddr) = unpack($sockaddr,$addr);
    @inetaddr = unpack('C4',$inetaddr);
    print "$af $port @inetaddr\n";

    while (<NS>) {
        print;
        print NS;
    }
}

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