101 lines
4.3 KiB
Markdown
Executable file
101 lines
4.3 KiB
Markdown
Executable file
# amphp/dns
|
|
|
|
AMPHP is a collection of event-driven libraries for PHP designed with fibers and concurrency in mind.
|
|
`amphp/dns` provides hostname to IP address resolution and querying specific DNS records.
|
|
|
|
[](https://github.com/amphp/dns/releases)
|
|
[](https://github.com/amphp/dns/blob/master/LICENSE)
|
|
|
|
## Installation
|
|
|
|
This package can be installed as a [Composer](https://getcomposer.org/) dependency.
|
|
|
|
```bash
|
|
composer require amphp/dns
|
|
```
|
|
|
|
## Usage
|
|
|
|
### Configuration
|
|
|
|
`amphp/dns` automatically detects the system configuration and uses it. On Unix-like systems it reads `/etc/resolv.conf` and respects settings for nameservers, timeouts, and attempts. On Windows it looks up the correct entries in the Windows Registry and takes the listed nameservers. You can pass a custom `ConfigLoader` instance to `Rfc1035StubResolver` to load another configuration, such as a static config.
|
|
|
|
It respects the system's hosts file on Unix and Windows based systems, so it works just fine in environments like Docker with named containers.
|
|
|
|
The package uses a global default resolver which can be accessed and changed via `Amp\Dns\resolver()`. If an argument other than `null` is given, the resolver is used as global instance.
|
|
|
|
Usually you don't have to change the resolver. If you want to use a custom configuration for a certain request, you can create a new resolver instance and use that instead of changing the global one.
|
|
|
|
### Hostname to IP Resolution
|
|
|
|
`Amp\Dns\resolve` provides hostname to IP address resolution. It returns an array of IPv4 and IPv6 addresses by default. The type of IP addresses returned can be restricted by passing a second argument with the respective type.
|
|
|
|
```php
|
|
// Example without type restriction. Will return IPv4 and / or IPv6 addresses.
|
|
// What's returned depends on what's available for the given hostname.
|
|
|
|
/** @var Amp\Dns\DnsRecord[] $records */
|
|
$records = Amp\Dns\resolve("github.com");
|
|
```
|
|
|
|
```php
|
|
// Example with type restriction. Will throw an exception if there are no A records.
|
|
|
|
/** @var Amp\Dns\DnsRecord[] $records */
|
|
$records = Amp\Dns\resolve("github.com", Amp\Dns\DnsRecord::A);
|
|
```
|
|
|
|
### Custom Queries
|
|
|
|
`Amp\Dns\query` supports the various other DNS record types such as `MX`, `PTR`, or `TXT`. It automatically rewrites passed IP addresses for `PTR` lookups.
|
|
|
|
```php
|
|
/** @var Amp\Dns\DnsRecord[] $records */
|
|
$records = Amp\Dns\query("google.com", Amp\Dns\DnsRecord::MX);
|
|
```
|
|
|
|
```php
|
|
/** @var Amp\Dns\DnsRecord[] $records */
|
|
$records = Amp\Dns\query("8.8.8.8", Amp\Dns\DnsRecord::PTR);
|
|
```
|
|
|
|
### Caching
|
|
|
|
The `Rfc1035StubResolver` caches responses by default in an `Amp\Cache\LocalCache`. You can set any other `Amp\Cache\Cache` implementation by creating a custom instance of `Rfc1035StubResolver` and setting that via `Amp\Dns\resolver()`, but it's usually unnecessary. If you have a lot of very short running scripts, you might want to consider using a local DNS resolver with a cache instead of setting a custom cache implementation, such as `dnsmasq`.
|
|
|
|
### Reloading Configuration
|
|
|
|
The `Rfc1035StubResolver` (which is the default resolver shipping with that package) will cache the configuration of `/etc/resolv.conf` / the Windows Registry and the read host files by default. If you wish to reload them, you can set a periodic timer that requests a background reload of the configuration.
|
|
|
|
```php
|
|
EventLoop::repeat(600, function () use ($resolver) {
|
|
Amp\Dns\dnsResolver()->reloadConfig();
|
|
});
|
|
```
|
|
|
|
> **Note**
|
|
> The above code relies on the resolver not being changed. `reloadConfig` is specific to `Rfc1035StubResolver` and is not part of the `Resolver` interface.
|
|
|
|
## Example
|
|
|
|
```php
|
|
<?php
|
|
|
|
require __DIR__ . '/examples/_bootstrap.php';
|
|
|
|
$githubIpv4 = Amp\Dns\resolve("github.com", Dns\Record::A);
|
|
pretty_print_records("github.com", $githubIpv4);
|
|
|
|
$firstGoogleResult = Amp\Future\awaitFirst([
|
|
Amp\async(fn() => Amp\Dns\resolve("google.com", Dns\Record::A)),
|
|
Amp\async(fn() => Amp\Dns\resolve("google.com", Dns\Record::AAAA)),
|
|
]);
|
|
|
|
pretty_print_records("google.com", $firstGoogleResult);
|
|
|
|
$combinedGoogleResult = Amp\Dns\resolve("google.com");
|
|
pretty_print_records("google.com", $combinedGoogleResult);
|
|
|
|
$googleMx = Amp\Dns\query("google.com", Amp\Dns\DnsRecord::MX);
|
|
pretty_print_records("google.com", $googleMx);
|
|
```
|