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|
//! dog, the command-line DNS client.
#![warn(deprecated_in_future)]
#![warn(future_incompatible)]
#![warn(missing_copy_implementations)]
#![warn(missing_docs)]
#![warn(nonstandard_style)]
#![warn(rust_2018_compatibility)]
#![warn(rust_2018_idioms)]
#![warn(single_use_lifetimes)]
#![warn(trivial_casts, trivial_numeric_casts)]
#![warn(unused)]
#![warn(clippy::all, clippy::pedantic)]
#![allow(clippy::enum_glob_use)]
#![allow(clippy::module_name_repetitions)]
#![allow(clippy::option_if_let_else)]
#![allow(clippy::too_many_lines)]
#![allow(clippy::upper_case_acronyms)]
#![allow(clippy::wildcard_imports)]
#![deny(unsafe_code)]
use log::*;
mod colours;
mod connect;
mod hints;
mod logger;
mod output;
mod requests;
mod resolve;
mod table;
mod txid;
mod options;
use self::options::*;
/// Configures logging, parses the command-line options, and handles any
/// errors before passing control over to the Dog type.
fn main() {
use std::env;
use std::process::exit;
logger::configure(env::var_os("DOG_DEBUG"));
#[cfg(windows)]
if let Err(e) = ansi_term::enable_ansi_support() {
warn!("Failed to enable ANSI support: {}", e);
}
match Options::getopts(env::args_os().skip(1)) {
OptionsResult::Ok(options) => {
info!("Running with options -> {:#?}", options);
disabled_feature_check(&options);
exit(run(options));
}
OptionsResult::Help(help_reason, use_colours) => {
if use_colours.should_use_colours() {
print!("{}", include_str!(concat!(env!("OUT_DIR"), "/usage.pretty.txt")));
}
else {
print!("{}", include_str!(concat!(env!("OUT_DIR"), "/usage.bland.txt")));
}
if help_reason == HelpReason::NoDomains {
exit(exits::OPTIONS_ERROR);
}
else {
exit(exits::SUCCESS);
}
}
OptionsResult::Version(use_colours) => {
if use_colours.should_use_colours() {
print!("{}", include_str!(concat!(env!("OUT_DIR"), "/version.pretty.txt")));
}
else {
print!("{}", include_str!(concat!(env!("OUT_DIR"), "/version.bland.txt")));
}
exit(exits::SUCCESS);
}
OptionsResult::InvalidOptionsFormat(oe) => {
eprintln!("dog: Invalid options: {}", oe);
exit(exits::OPTIONS_ERROR);
}
OptionsResult::InvalidOptions(why) => {
eprintln!("dog: Invalid options: {}", why);
exit(exits::OPTIONS_ERROR);
}
}
}
/// Runs dog with some options, returning the status to exit with.
fn run(Options { requests, format, measure_time }: Options) -> i32 {
use std::time::Instant;
let should_show_opt = requests.edns.should_show();
let mut responses = Vec::new();
let timer = if measure_time { Some(Instant::now()) } else { None };
let mut errored = false;
let local_host_hints = match hints::LocalHosts::load() {
Ok(lh) => lh,
Err(e) => {
warn!("Error loading local host hints: {}", e);
hints::LocalHosts::default()
}
};
for hostname_in_query in &requests.inputs.domains {
if local_host_hints.contains(hostname_in_query) {
eprintln!("warning: domain '{}' also exists in hosts file", hostname_in_query);
}
}
let request_tuples = match requests.generate() {
Ok(rt) => rt,
Err(e) => {
eprintln!("Unable to obtain resolver: {}", e);
return exits::SYSTEM_ERROR;
}
};
for (transport, request_list) in request_tuples {
let request_list_len = request_list.len();
for (i, request) in request_list.into_iter().enumerate() {
let result = transport.send(&request);
match result {
Ok(mut response) => {
if response.flags.error_code.is_some() && i != request_list_len - 1 {
continue;
}
if ! should_show_opt {
response.answers.retain(dns::Answer::is_standard);
response.authorities.retain(dns::Answer::is_standard);
response.additionals.retain(dns::Answer::is_standard);
}
responses.push(response);
break;
}
Err(e) => {
format.print_error(e);
errored = true;
break;
}
}
}
}
let duration = timer.map(|t| t.elapsed());
if format.print(responses, duration) {
if errored {
exits::NETWORK_ERROR
}
else {
exits::SUCCESS
}
}
else {
exits::NO_SHORT_RESULTS
}
}
/// Checks whether the options contain parameters that will cause dog to fail
/// because the feature is disabled by exiting if so.
#[allow(unused)]
fn disabled_feature_check(options: &Options) {
use std::process::exit;
use crate::connect::TransportType;
#[cfg(all(not(feature = "with_tls"), not(feature = "with_rustls_tls")))]
if options.requests.inputs.transport_types.contains(&TransportType::TLS) {
eprintln!("dog: Cannot use '--tls': This version of dog has been compiled without TLS support");
exit(exits::OPTIONS_ERROR);
}
#[cfg(all(not(feature = "with_https"), not(feature = "with_rustls_https")))]
if options.requests.inputs.transport_types.contains(&TransportType::HTTPS) {
eprintln!("dog: Cannot use '--https': This version of dog has been compiled without HTTPS support");
exit(exits::OPTIONS_ERROR);
}
}
/// The possible status numbers dog can exit with.
mod exits {
/// Exit code for when everything turns out OK.
pub const SUCCESS: i32 = 0;
/// Exit code for when there was at least one network error during execution.
pub const NETWORK_ERROR: i32 = 1;
/// Exit code for when there is no result from the server when running in
/// short mode. This can be any received server error, not just `NXDOMAIN`.
pub const NO_SHORT_RESULTS: i32 = 2;
/// Exit code for when the command-line options are invalid.
pub const OPTIONS_ERROR: i32 = 3;
/// Exit code for when the system network configuration could not be determined.
pub const SYSTEM_ERROR: i32 = 4;
}
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