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| 1 | <?php |
| 2 | /** |
| 3 | * DNS providers known to Send, matched by nameserver. |
| 4 | * |
| 5 | * @package automattic/jetpack-send |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Send; |
| 9 | |
| 10 | if ( ! defined( 'ABSPATH' ) ) { |
| 11 | exit( 0 ); |
| 12 | } |
| 13 | |
| 14 | /** |
| 15 | * PHP copy of the nameserver patterns in `_inc/data/providers.json`, plus the hosts whose |
| 16 | * addresses can't be used for sending. |
| 17 | */ |
| 18 | class Dns_Providers { |
| 19 | |
| 20 | /** |
| 21 | * Providers by slug: `array( 'name' => string, 'ns' => string[], 'match' => 'suffix'|'substring' )`. |
| 22 | * Must list the same slugs and patterns as `_inc/data/providers.json`, in the same (rank) order. |
| 23 | * |
| 24 | * @var array<string, array{name: string, ns: string[], match: string}> |
| 25 | */ |
| 26 | const PROVIDERS = array( |
| 27 | 'cloudflare' => array( |
| 28 | 'name' => 'Cloudflare', |
| 29 | 'ns' => array( '.ns.cloudflare.com' ), |
| 30 | 'match' => 'suffix', |
| 31 | ), |
| 32 | 'bluehost' => array( |
| 33 | 'name' => 'Bluehost', |
| 34 | 'ns' => array( 'ns1.bluehost.com', 'ns2.bluehost.com', '.bluehost.com', '.mybluehost.me', '.bluehost.in', '.hostmonster.com', '.justhost.com' ), |
| 35 | 'match' => 'suffix', |
| 36 | ), |
| 37 | 'hostinger' => array( |
| 38 | 'name' => 'Hostinger', |
| 39 | 'ns' => array( '.dns-parking.com' ), |
| 40 | 'match' => 'suffix', |
| 41 | ), |
| 42 | 'godaddy' => array( |
| 43 | 'name' => 'GoDaddy', |
| 44 | 'ns' => array( '.domaincontrol.com' ), |
| 45 | 'match' => 'suffix', |
| 46 | ), |
| 47 | 'hostgator' => array( |
| 48 | 'name' => 'HostGator', |
| 49 | 'ns' => array( '.hostgator.com', '.hostgator.com.br', '.hostgator.mx', '.websitewelcome.com' ), |
| 50 | 'match' => 'suffix', |
| 51 | ), |
| 52 | 'siteground' => array( |
| 53 | 'name' => 'SiteGround', |
| 54 | 'ns' => array( '.siteground.net' ), |
| 55 | 'match' => 'suffix', |
| 56 | ), |
| 57 | 'ionos' => array( |
| 58 | 'name' => 'IONOS', |
| 59 | 'ns' => array( '.ui-dns.com', '.ui-dns.de', '.ui-dns.org', '.ui-dns.biz' ), |
| 60 | 'match' => 'suffix', |
| 61 | ), |
| 62 | 'namecheap' => array( |
| 63 | 'name' => 'Namecheap', |
| 64 | 'ns' => array( '.registrar-servers.com', '.namecheaphosting.com' ), |
| 65 | 'match' => 'suffix', |
| 66 | ), |
| 67 | 'ovhcloud' => array( |
| 68 | 'name' => 'OVHcloud', |
| 69 | 'ns' => array( '.ovh.net', '.anycast.me', '.ovh.ca' ), |
| 70 | 'match' => 'suffix', |
| 71 | ), |
| 72 | 'dreamhost' => array( |
| 73 | 'name' => 'DreamHost', |
| 74 | 'ns' => array( '.dreamhost.com' ), |
| 75 | 'match' => 'suffix', |
| 76 | ), |
| 77 | 'route53' => array( |
| 78 | 'name' => 'Amazon Route 53', |
| 79 | 'ns' => array( '.awsdns-' ), |
| 80 | 'match' => 'substring', |
| 81 | ), |
| 82 | 'squarespace' => array( |
| 83 | 'name' => 'Squarespace (incl. former Google Domains)', |
| 84 | 'ns' => array( '.squarespacedns.com', '.googledomains.com' ), |
| 85 | 'match' => 'suffix', |
| 86 | ), |
| 87 | 'wordpresscom' => array( |
| 88 | 'name' => 'WordPress.com', |
| 89 | 'ns' => array( '.wordpress.com' ), |
| 90 | 'match' => 'suffix', |
| 91 | ), |
| 92 | 'other' => array( |
| 93 | 'name' => 'Other or not sure', |
| 94 | 'ns' => array(), |
| 95 | 'match' => 'suffix', |
| 96 | ), |
| 97 | ); |
| 98 | |
| 99 | /** |
| 100 | * Domain Connect hosts seen for each provider, mirroring `domainConnectHost` in `_inc/data/providers.json`. |
| 101 | * |
| 102 | * @var array<string, string> |
| 103 | */ |
| 104 | const DOMAIN_CONNECT_HOSTS = array( |
| 105 | 'cloudflare' => 'api.cloudflare.com/client/v4/dns/domainconnect', |
| 106 | 'godaddy' => 'domainconnect.api.godaddy.com', |
| 107 | 'ionos' => 'api.domainconnect.ionos.com', |
| 108 | 'squarespace' => 'domains.squarespace.com', |
| 109 | 'wordpresscom' => 'public-api.wordpress.com/rest/v1.3/domain-connect', |
| 110 | ); |
| 111 | |
| 112 | /** |
| 113 | * Nameserver suffix that another DNS service shares with Squarespace, so it needs Domain Connect to confirm. |
| 114 | * |
| 115 | * @var string |
| 116 | */ |
| 117 | const SHARED_SQUARESPACE_SUFFIX = '.googledomains.com'; |
| 118 | |
| 119 | /** |
| 120 | * Host suffixes that are temporary or staging addresses, never a domain to send from. |
| 121 | * |
| 122 | * @var string[] |
| 123 | */ |
| 124 | const NON_EDITABLE_SUFFIXES = array( |
| 125 | 'wpcomstaging.com', |
| 126 | 'mystagingwebsite.com', |
| 127 | 'mybluehost.me', |
| 128 | 'hostingersite.com', |
| 129 | 'wpengine.com', |
| 130 | 'wpenginepowered.com', |
| 131 | 'pressable.com', |
| 132 | 'kinsta.cloud', |
| 133 | 'flywheelsites.com', |
| 134 | 'flywheelstaging.com', |
| 135 | 'pantheonsite.io', |
| 136 | 'cloudwaysapps.com', |
| 137 | 'myftpupload.com', |
| 138 | 'instawp.xyz', |
| 139 | 'tastewp.com', |
| 140 | 'playground.wordpress.net', |
| 141 | 'ddev.site', |
| 142 | 'lndo.site', |
| 143 | 'ngrok.io', |
| 144 | 'ngrok-free.app', |
| 145 | 'trycloudflare.com', |
| 146 | 'local', |
| 147 | ); |
| 148 | |
| 149 | /** |
| 150 | * Reserved top-level names (RFC 2606 / RFC 6761) that can't have real DNS. |
| 151 | * |
| 152 | * @var string[] |
| 153 | */ |
| 154 | const RESERVED_TLDS = array( 'example', 'invalid', 'localhost', 'test' ); |
| 155 | |
| 156 | /** |
| 157 | * The provider slug for one nameserver. |
| 158 | * |
| 159 | * @param string $nameserver Lowercased hostname, no trailing dot. |
| 160 | * @return string|null Slug, or null when no pattern matches. |
| 161 | */ |
| 162 | public static function match_nameserver( $nameserver ) { |
| 163 | $nameserver = strtolower( rtrim( trim( (string) $nameserver ), '.' ) ); |
| 164 | if ( '' === $nameserver ) { |
| 165 | return null; |
| 166 | } |
| 167 | foreach ( self::PROVIDERS as $slug => $provider ) { |
| 168 | foreach ( $provider['ns'] as $pattern ) { |
| 169 | if ( self::matches( $nameserver, $pattern, $provider['match'] ) ) { |
| 170 | return $slug; |
| 171 | } |
| 172 | } |
| 173 | } |
| 174 | return null; |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * The provider for a set of nameservers: majority wins, a mixed set lowers confidence. |
| 179 | * |
| 180 | * @param string[] $nameservers Lowercased hostnames. |
| 181 | * @return array{provider: string|null, confidence: string} Confidence is `high`, `low` or `none`. |
| 182 | */ |
| 183 | public static function match_nameservers( array $nameservers ) { |
| 184 | $nameservers = array_values( array_unique( array_filter( array_map( 'strval', $nameservers ) ) ) ); |
| 185 | $counts = array(); |
| 186 | foreach ( $nameservers as $nameserver ) { |
| 187 | $slug = self::match_nameserver( $nameserver ); |
| 188 | $key = null === $slug ? '' : $slug; |
| 189 | $counts[ $key ] = ( $counts[ $key ] ?? 0 ) + 1; |
| 190 | } |
| 191 | |
| 192 | // Most matches wins; ties go to the higher-ranked provider (PROVIDERS order). |
| 193 | $best = null; |
| 194 | foreach ( array_keys( self::PROVIDERS ) as $slug ) { |
| 195 | if ( isset( $counts[ $slug ] ) && ( null === $best || $counts[ $slug ] > $counts[ $best ] ) ) { |
| 196 | $best = $slug; |
| 197 | } |
| 198 | } |
| 199 | if ( null === $best ) { |
| 200 | return array( |
| 201 | 'provider' => null, |
| 202 | 'confidence' => 'none', |
| 203 | ); |
| 204 | } |
| 205 | return array( |
| 206 | 'provider' => $best, |
| 207 | 'confidence' => count( $nameservers ) === $counts[ $best ] ? 'high' : 'low', |
| 208 | ); |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * The provider whose known Domain Connect host matches a discovered one. |
| 213 | * |
| 214 | * @param string $host Host from a `_domainconnect` record. |
| 215 | * @return string|null Slug, or null when none matches. |
| 216 | */ |
| 217 | public static function match_domain_connect( $host ) { |
| 218 | $host = strtolower( trim( (string) $host ) ); |
| 219 | if ( '' === $host ) { |
| 220 | return null; |
| 221 | } |
| 222 | foreach ( self::DOMAIN_CONNECT_HOSTS as $slug => $known ) { |
| 223 | if ( false !== strpos( $host, $known ) ) { |
| 224 | return $slug; |
| 225 | } |
| 226 | } |
| 227 | return null; |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * Whether a slug is a known provider (including `other` and `unsure`). |
| 232 | * |
| 233 | * @param string $slug Slug. |
| 234 | * @return bool |
| 235 | */ |
| 236 | public static function is_known( $slug ) { |
| 237 | return is_string( $slug ) && ( 'unsure' === $slug || isset( self::PROVIDERS[ $slug ] ) ); |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Whether a nameserver matches a pattern: a suffix on a label boundary, or a plain substring. |
| 242 | * |
| 243 | * @param string $nameserver Lowercased hostname. |
| 244 | * @param string $pattern Pattern from PROVIDERS. |
| 245 | * @param string $mode `suffix` or `substring`. |
| 246 | * @return bool |
| 247 | */ |
| 248 | private static function matches( $nameserver, $pattern, $mode ) { |
| 249 | if ( 'substring' === $mode ) { |
| 250 | return false !== strpos( $nameserver, $pattern ); |
| 251 | } |
| 252 | if ( '.' !== $pattern[0] ) { |
| 253 | if ( $nameserver === $pattern ) { |
| 254 | return true; |
| 255 | } |
| 256 | $pattern = '.' . $pattern; |
| 257 | } |
| 258 | return strlen( $nameserver ) > strlen( $pattern ) && substr( $nameserver, -strlen( $pattern ) ) === $pattern; |
| 259 | } |
| 260 | } |