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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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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const ftp = try chilkat.Ftp2.init();
    defer ftp.deinit();

    ftp.setHostname("ftp.example.com");
    ftp.setUsername("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.setSoRcvBuf(4194304);
    ftp.setSoSndBuf(524288);

    // PreferIpv6 (default false) chooses IPv6 over IPv4 when a hostname resolves to both.
    ftp.setPreferIpv6(false);

    // ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing
    // connection to a specific local interface.
    ftp.setClientIpAddress("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.setPassword("myPassword");

    ftp.connect() catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Connected with custom socket options.\n", .{});

    ftp.disconnect() catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };
}