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rust-gamedig/crates/cli/src/main.rs

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Rust
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use std::net::{IpAddr, ToSocketAddrs};
use clap::{Parser, Subcommand, ValueEnum};
use gamedig::{
games::*,
protocols::types::{CommonResponse, ExtraRequestSettings, TimeoutSettings},
};
mod error;
use self::error::{Error, Result};
const GAMEDIG_HEADER: &str = r"
_____ _____ _ _____ _ _____
/ ____| | __ \(_) / ____| | |_ _|
| | __ __ _ _ __ ___ ___| | | |_ __ _ | | | | | |
| | |_ |/ _` | '_ ` _ \ / _ \ | | | |/ _` | | | | | | |
| |__| | (_| | | | | | | __/ |__| | | (_| | | |____| |____ _| |_
\_____|\__,_|_| |_| |_|\___|_____/|_|\__, | \_____|______|_____|
__/ |
|___/
A command line interface for querying game servers.
Copyright (C) 2022 - 2024 GameDig Organization & Contributors
Licensed under the MIT license
";
// NOTE: For some reason without setting long_about here the doc comment for
// ExtraRequestSettings gets set as the about for the CLI.
#[derive(Debug, Parser)]
#[command(author, version, about = GAMEDIG_HEADER, long_about = None)]
struct Cli {
#[command(subcommand)]
action: Action,
}
#[derive(Subcommand, Debug)]
enum Action {
/// Query game server information
Query {
/// Unique identifier of the game for which server information is being
/// queried.
#[arg(short, long)]
game: String,
/// Hostname or IP address of the server.
#[arg(short, long)]
ip: String,
/// Optional query port number for the server. If not provided the
/// default port for the game is used.
#[arg(short, long)]
port: Option<u16>,
/// Specifies the output format
#[arg(short, long, default_value = "debug", value_enum)]
format: OutputFormat,
/// Which response variant to use when outputting
#[arg(short, long, default_value = "generic")]
output_mode: OutputMode,
/// Optional file path for packet capture file writer
///
/// When set a PCAP file will be written to the location. This file can
/// be read with a tool like wireshark. The PCAP contains a log of the
/// TCP and UDP data sent/recieved by the gamedig library, it does not
/// contain an accurate representation of the real packets sent on the
/// wire as some information has to be hallucinated in order for it to
/// display nicely.
#[cfg(feature = "packet_capture")]
#[arg(short, long)]
capture: Option<std::path::PathBuf>,
/// Optional timeout settings for the server query
#[command(flatten, next_help_heading = "Timeouts")]
timeout_settings: Option<TimeoutSettings>,
/// Optional extra settings for the server query
#[command(flatten, next_help_heading = "Query options")]
extra_options: Option<ExtraRequestSettings>,
},
/// Check out the source code
Source,
/// Display the MIT License information
License,
}
#[derive(Clone, Debug, PartialEq, Eq, ValueEnum)]
enum OutputMode {
/// A generalised response that maps common fields from all game types to
/// the same name.
Generic,
/// The raw result returned from the protocol query, formatted similarly to
/// how the server returned it.
ProtocolSpecific,
}
#[derive(Clone, Debug, PartialEq, Eq, ValueEnum)]
enum OutputFormat {
/// Human readable structured output
Debug,
/// RFC 8259
#[cfg(feature = "json")]
JsonPretty,
/// RFC 8259
#[cfg(feature = "json")]
Json,
/// Parser tries to be mostly XML 1.1 (RFC 7303) compliant
#[cfg(feature = "xml")]
Xml,
/// RFC 4648 section 8
#[cfg(feature = "bson")]
BsonHex,
/// RFC 4648 section 4
#[cfg(feature = "bson")]
BsonBase64,
}
/// Attempt to find a game from the [library game definitions](GAMES) based on
/// its unique identifier.
///
/// # Arguments
/// * `game_id` - A string slice containing the unique game identifier.
///
/// # Returns
/// * Result<&'static [Game]> - On sucess returns a reference to the game
/// definition; on failure returns a [Error::UnknownGame] error.
fn find_game(game_id: &str) -> Result<&'static Game> {
// Attempt to retrieve the game from the predefined game list
GAMES
.get(game_id)
.ok_or_else(|| Error::UnknownGame(game_id.to_string()))
}
/// Resolve an IP address by either parsing an IP address or doing a DNS lookup.
/// In the case of DNS lookup update extra request options with the hostname.
///
/// # Arguments
/// * `host` - A string slice containing the IP address or hostname of a server
/// to resolve.
/// * `extra_options` - Mutable reference to extra options for the game query.
///
/// # Returns
/// * `Result<IpAddr>` - On sucess returns a resolved IP address; on failure
/// returns an [Error::InvalidHostname] error.
fn resolve_ip_or_domain<T: AsRef<str>>(host: T, extra_options: &mut Option<ExtraRequestSettings>) -> Result<IpAddr> {
let host_str = host.as_ref();
if let Ok(parsed_ip) = host_str.parse() {
Ok(parsed_ip)
} else {
set_hostname_if_missing(host_str, extra_options);
resolve_domain(host_str)
}
}
/// Resolve a domain name to one of its IP addresses (the first one returned).
///
/// # Arguments
/// * `domain` - A string slice containing the domain name to lookup.
///
/// # Returns
/// * `Result<IpAddr>` - On success, returns one of the resolved IP addresses;
/// on failure returns an [Error::InvalidHostname] error.
fn resolve_domain(domain: &str) -> Result<IpAddr> {
// Append a dummy port to perform socket address resolution and then extract the
// IP
Ok(format!("{}:0", domain)
.to_socket_addrs()
.map_err(|_| Error::InvalidHostname(domain.to_string()))?
.next()
.ok_or_else(|| Error::InvalidHostname(domain.to_string()))?
.ip())
}
/// Sets the hostname on extra request settings if it is not already set.
///
/// # Arguments
/// * `host` - A string slice containing the hostname.
/// * `extra_options` - A mutable reference to optional [ExtraRequestSettings].
fn set_hostname_if_missing(host: &str, extra_options: &mut Option<ExtraRequestSettings>) {
if let Some(extra_options) = extra_options {
if extra_options.hostname.is_none() {
// If extra_options exists but hostname is None overwrite hostname in place
extra_options.hostname = Some(host.to_string())
}
} else {
// If extra_options is None create default settings with hostname
*extra_options = Some(ExtraRequestSettings::default().set_hostname(host.to_string()));
}
}
/// Output the result of a query to stdout.
///
/// # Arguments
/// * `args` - A reference to the command line options.
/// * `result` - A reference to the result of the query.
fn output_result<T: CommonResponse + ?Sized>(output_mode: OutputMode, format: OutputFormat, result: &T) {
match format {
OutputFormat::Debug => {
match output_mode {
OutputMode::Generic => output_result_debug(result.as_json()),
OutputMode::ProtocolSpecific => output_result_debug(result.as_original()),
};
}
#[cfg(feature = "json")]
OutputFormat::JsonPretty => {
let _ = match output_mode {
OutputMode::Generic => output_result_json_pretty(result.as_json()),
OutputMode::ProtocolSpecific => output_result_json_pretty(result.as_original()),
};
}
#[cfg(feature = "json")]
OutputFormat::Json => {
let _ = match output_mode {
OutputMode::Generic => output_result_json(result.as_json()),
OutputMode::ProtocolSpecific => output_result_json(result.as_original()),
};
}
#[cfg(feature = "xml")]
OutputFormat::Xml => {
let _ = match output_mode {
OutputMode::Generic => output_result_xml(result.as_json()),
OutputMode::ProtocolSpecific => output_result_xml(result.as_original()),
};
}
#[cfg(feature = "bson")]
OutputFormat::BsonHex => {
let _ = match output_mode {
OutputMode::Generic => output_result_bson_hex(result.as_json()),
OutputMode::ProtocolSpecific => output_result_bson_hex(result.as_original()),
};
}
#[cfg(feature = "bson")]
OutputFormat::BsonBase64 => {
let _ = match output_mode {
OutputMode::Generic => output_result_bson_base64(result.as_json()),
OutputMode::ProtocolSpecific => output_result_bson_base64(result.as_original()),
};
}
}
}
/// Output the result using debug formatting.
///
/// # Arguments
/// * `result` - A result that can be output using the debug formatter.
fn output_result_debug<R: std::fmt::Debug>(result: R) {
println!("{:#?}", result);
}
/// Output the result as a JSON object.
///
/// # Arguments
/// * `result` - A serde serializable result.
#[cfg(feature = "json")]
fn output_result_json<T: serde::Serialize>(result: T) -> Result<()> {
println!("{}", serde_json::to_string(&result)?);
Ok(())
}
/// Output the result as a pretty printed JSON object.
///
/// # Arguments
/// * `result` - A serde serializable result.
#[cfg(feature = "json")]
fn output_result_json_pretty<T: serde::Serialize>(result: T) -> Result<()> {
println!("{}", serde_json::to_string_pretty(&result)?);
Ok(())
}
/// Output the result as an XML object.
/// # Arguments
/// * `result` - A serde serializable result.
#[cfg(feature = "xml")]
fn output_result_xml<T: serde::Serialize>(result: T) -> Result<()> {
use quick_xml::{
events::{BytesDecl, BytesEnd, BytesStart, BytesText, Event},
Writer,
};
use serde_json::Value;
// Serialize the input `result` of generic type `T` into a JSON value.
// This step converts the Rust data structure into a JSON format,
// which will then be used to generate the corresponding XML.
let json = serde_json::to_value(result)?;
// Initialize the XML writer with a new, empty vector to store the XML data.
let mut writer = Writer::new(Vec::new());
// Write the XML 1.1 declaration
writer.write_event(Event::Decl(BytesDecl::new("1.1", Some("utf-8"), None)))?;
// Define a recursive function `json_to_xml` to convert the JSON value into XML
// format. The function takes a mutable reference to the XML writer, an
// optional key as a string slice, and a reference to the JSON value to be
// converted.
fn json_to_xml<W: std::io::Write>(writer: &mut Writer<W>, key: Option<&str>, value: &Value) -> Result<()> {
match value {
// If the JSON value is an object, iterate through its properties,
// creating XML elements with corresponding keys and values.
Value::Object(obj) => {
if let Some(key) = key {
// Start an XML element for the object.
writer.write_event(Event::Start(BytesStart::new(key)))?;
}
for (k, v) in obj {
// Recursively process each property of the object.
json_to_xml(writer, Some(k), v)?;
}
if let Some(key) = key {
// Close the XML element for the object.
writer.write_event(Event::End(BytesEnd::new(key)))?;
}
}
// If the JSON value is an array, iterate through its elements,
// creating XML elements for each item.
Value::Array(arr) => {
for v in arr {
// Use "item" as the default key for array elements without keys.
json_to_xml(writer, key.or(Some("item")), v)?;
}
}
// If the JSON value is null, create an empty XML element.
Value::Null => {
if let Some(key) = key {
writer.write_event(Event::Empty(BytesStart::new(key)))?;
}
}
// For all other JSON value types (String, Number, Bool),
// convert the value to a string and create an XML element with the text content.
// Note: We handle null strings here as well, as they are treated as a string type.
_ => {
if let Some(key) = key {
// Start the XML element with the given key.
writer.write_event(Event::Start(BytesStart::new(key)))?;
}
// Convert the JSON value to a string, trimming quotes for non-string values.
let text_string = match value {
Value::String(s) => s.to_string(),
_ => value.to_string().trim_matches('"').to_string(),
};
// Create a text node with the converted string value.
writer.write_event(Event::Text(BytesText::new(&text_string)))?;
if let Some(key) = key {
// Close the XML element.
writer.write_event(Event::End(BytesEnd::new(key)))?;
}
}
}
Ok(())
}
// Start the root XML element named "data".
writer.write_event(Event::Start(BytesStart::new("data")))?;
// Convert the top-level JSON value to XML.
json_to_xml(&mut writer, None, &json)?;
// Close the root XML element.
writer.write_event(Event::End(BytesEnd::new("data")))?;
// Convert the XML data stored in the writer to a UTF-8 string.
let xml_bytes = writer.into_inner();
let xml_string = String::from_utf8(xml_bytes).expect("Failed to convert XML bytes to UTF-8 string");
println!("{}", xml_string);
Ok(())
}
/// Output the result as a BSON object encoded as a hex string.
///
/// # Arguments
/// * `result` - A serde serializable result.
#[cfg(feature = "bson")]
fn output_result_bson_hex<T: serde::Serialize>(result: T) -> Result<()> {
let bson = bson::to_bson(&result)?;
if let bson::Bson::Document(document) = bson {
let bytes = bson::to_vec(&document)?;
println!("{}", hex::encode(bytes));
Ok(())
} else {
panic!("Failed to convert result to BSON Hex (BSON_DOCUMENT_UNAVAILABLE)");
}
}
/// Output the result as a BSON object encoded as a base64 string.
///
/// # Arguments
/// * `result` - A serde serializable result.
#[cfg(feature = "bson")]
fn output_result_bson_base64<T: serde::Serialize>(result: T) -> Result<()> {
use base64::Engine;
let bson = bson::to_bson(&result)?;
if let bson::Bson::Document(document) = bson {
let bytes = bson::to_vec(&document)?;
println!("{}", base64::prelude::BASE64_STANDARD.encode(bytes));
Ok(())
} else {
panic!("Failed to convert result to BSON Base64 (BSON_DOCUMENT_UNAVAILABLE)");
}
}
fn main() -> Result<()> {
let args = Cli::parse();
match args.action {
Action::Query {
game,
ip,
port,
format,
output_mode,
#[cfg(feature = "packet_capture")]
capture,
timeout_settings,
extra_options,
} => {
// Process the query command
let game = find_game(&game)?;
let mut extra_options = extra_options;
let ip = resolve_ip_or_domain(&ip, &mut extra_options)?;
#[cfg(feature = "packet_capture")]
gamedig::capture::setup_capture(capture);
let result = query_with_timeout_and_extra_settings(game, &ip, port, timeout_settings, extra_options)?;
output_result(output_mode, format, result.as_ref());
}
Action::Source => {
println!("{}", GAMEDIG_HEADER);
#[cfg(feature = "browser")]
{
// Directly offering to open the URL
println!("\nWould you like to open the GitHub repository in your default browser? [Y/n]");
let mut choice = String::new();
std::io::stdin().read_line(&mut choice).unwrap();
if choice.trim().eq_ignore_ascii_case("Y") {
if webbrowser::open("https://github.com/gamedig/rust-gamedig").is_ok() {
println!("Opening GitHub repository in default browser...");
} else {
println!("Failed to open GitHub repository in default browser.");
println!("Please use the following URL: https://github.com/gamedig/rust-gamedig");
}
} else {
println!("Not to worry, you can always open the repository manually");
println!("by visiting the following URL: https://github.com/gamedig/rust-gamedig");
}
}
#[cfg(not(feature = "browser"))]
{
println!("\nYou can find the source code for this project at the following URL:");
println!("https://github.com/gamedig/rust-gamedig");
}
println!("\nBe sure to leave a star if you like the project :)");
}
Action::License => {
// Bake the license into the binary
// so we don't have to ship it separately
println!("{}", include_str!("../LICENSE.md"));
}
}
Ok(())
}
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