Use FAIL as the default dest if unable to parse

src/main.zig

@@ -75,7 +75,7 @@ pub fn main() !void {
     return clap.help(std.io.getStdErr().writer(), clap.Help, &params, .{});
 }
 
-fn parseDest(in: ?[]const u8) ![4]u8 {
+fn parseDest(in: ?[]const u8) [4]u8 {
     if (in) |dest| {
         if (dest.len <= 4) {
             var res: [4]u8 = @splat(0);
@@ -83,10 +83,10 @@ fn parseDest(in: ?[]const u8) ![4]u8 {
             return res;
         }
 
-        const addr = try std.net.Ip4Address.parse(dest, 0);
+        const addr = std.net.Ip4Address.parse(dest, 0) catch return "FAIL".*;
         return @bitCast(addr.sa.addr);
     }
-    return .{ 70, 70, 70, 70 };
+    return "zap".*;
 }
 
 const builtin = @import("builtin");