CkPython

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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import sys
import chilkat

success = False

ftp = chilkat.CkFtp2()

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 False) chooses IPv6 over IPv4 when a hostname resolves to both.
ftp.put_PreferIpv6(False)

#  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 == False):
    print(ftp.lastErrorText())
    sys.exit()

print("Connected with custom socket options.")

success = ftp.Disconnect()
if (success == False):
    print(ftp.lastErrorText())
    sys.exit()