Zig

Check Internet Connectivity

See more Socket/SSL/TLS Examples

Demonstrates an efficient way to test for Internet connectivity. Zig

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

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

    const socket = try chilkat.Socket.init();
    defer socket.deinit();
    // 1. Use a reliable Anycast IP.
    //    8.8.8.8 (Google) or 1.1.1.1 (Cloudflare) are the industry standards.
    const target_ip = "8.8.8.8";

    // 2. Use Port 53 (DNS).
    //    DNS servers typically listen on TCP Port 53 as well as UDP.
    //    (Alternatively, use port 443 if you suspect port 53 is blocked).
    const port = 53;

    // 3. Disable SSL (0).
    //    We are not doing a handshake, just a TCP connection.
    const ssl = false;

    // 4. Short Timeout (1500ms).
    //    If you can't reach Google in 1.5 seconds, the connection is
    //    likely too poor for practical use anyway.
    const timeout_ms = 1500;

    // Connect
    socket.connect(target_ip, port, ssl, timeout_ms) catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    socket.close(10) catch {};

    std.debug.print("We have Internet connectivity.\n", .{});
}