Perl

FTP Socket Buffer and Address Options

Demonstrates the SoRcvBuf, SoSndBuf, PreferIpv6, and ClientIpAddress properties.

Background: These are low-level knobs for specific situations. Larger send/receive buffers can improve throughput on high-bandwidth, high-latency links, though the defaults suit the common case. PreferIpv6 only matters when a hostname resolves to both address families, choosing which to try first. ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing connection to a particular local interface. Change any of these only with a concrete reason.

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Perl

use chilkat();

$success = 0;

$ftp = chilkat::CkFtp2->new();

$ftp->put_Hostname("ftp.example.com");
$ftp->put_Username("myFtpLogin");

#  SoRcvBuf and SoSndBuf set the TCP socket receive/send buffer sizes.  The defaults are tuned for
#  the common case; larger values can sometimes help throughput on high-latency links.
$ftp->put_SoRcvBuf(4194304);
$ftp->put_SoSndBuf(524288);

#  PreferIpv6 (default 0) chooses IPv6 over IPv4 when a hostname resolves to both.
$ftp->put_PreferIpv6(0);

#  ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing
#  connection to a specific local interface.
$ftp->put_ClientIpAddress("192.168.1.50");

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
$ftp->put_Password("myPassword");

$success = $ftp->Connect();
if ($success == 0) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

print "Connected with custom socket options." . "\r\n";

$success = $ftp->Disconnect();
if ($success == 0) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}