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| ListeningPidResolver | |
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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | /** |
| 5 | * SPDX-FileCopyrightText: 2026 LibreCode coop and contributors |
| 6 | * SPDX-License-Identifier: AGPL-3.0-or-later |
| 7 | */ |
| 8 | |
| 9 | namespace OCA\Libresign\Service\Process; |
| 10 | |
| 11 | use OCA\Libresign\Vendor\Symfony\Component\Process\Process; |
| 12 | |
| 13 | class ListeningPidResolver { |
| 14 | /** |
| 15 | * @return int[] |
| 16 | */ |
| 17 | public function findListeningPids(int $port): array { |
| 18 | if ($port <= 0) { |
| 19 | throw new \RuntimeException('Invalid port to inspect process listeners.'); |
| 20 | } |
| 21 | |
| 22 | $usedStrategy = false; |
| 23 | $pids = []; |
| 24 | |
| 25 | $ss = $this->findListeningPidsUsingSs($port); |
| 26 | if ($ss !== null) { |
| 27 | $usedStrategy = true; |
| 28 | $pids = array_merge($pids, $ss); |
| 29 | } |
| 30 | |
| 31 | $lsof = $this->findListeningPidsUsingLsof($port); |
| 32 | if ($lsof !== null) { |
| 33 | $usedStrategy = true; |
| 34 | $pids = array_merge($pids, $lsof); |
| 35 | } |
| 36 | |
| 37 | $proc = $this->findListeningPidsUsingProc($port); |
| 38 | if ($proc !== null) { |
| 39 | $usedStrategy = true; |
| 40 | $pids = array_merge($pids, $proc); |
| 41 | } |
| 42 | |
| 43 | if (!$usedStrategy) { |
| 44 | throw new \RuntimeException('Unable to inspect listening process PIDs: no strategy available.'); |
| 45 | } |
| 46 | |
| 47 | return array_values(array_filter( |
| 48 | array_unique(array_map(intval(...), $pids)), |
| 49 | static fn (int $pid): bool => $pid > 0, |
| 50 | )); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * @return int[]|null null means strategy unavailable |
| 55 | */ |
| 56 | protected function findListeningPidsUsingSs(int $port): ?array { |
| 57 | if (!$this->commandIsAvailable('ss')) { |
| 58 | return null; |
| 59 | } |
| 60 | |
| 61 | $process = $this->createProcess(['ss', '-ltnp', 'sport = :' . $port]); |
| 62 | $process->run(); |
| 63 | if (!$process->isSuccessful()) { |
| 64 | return []; |
| 65 | } |
| 66 | |
| 67 | $output = $process->getOutput(); |
| 68 | preg_match_all('/pid=(\d+)/', $output, $matches); |
| 69 | if (!isset($matches[1]) || !is_array($matches[1])) { |
| 70 | return []; |
| 71 | } |
| 72 | |
| 73 | return array_map(intval(...), $matches[1]); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * @return int[]|null null means strategy unavailable |
| 78 | */ |
| 79 | protected function findListeningPidsUsingLsof(int $port): ?array { |
| 80 | if (!$this->commandIsAvailable('lsof')) { |
| 81 | return null; |
| 82 | } |
| 83 | |
| 84 | $process = $this->createProcess(['lsof', '-ti', 'tcp:' . $port, '-sTCP:LISTEN']); |
| 85 | $process->run(); |
| 86 | if (!$process->isSuccessful()) { |
| 87 | return []; |
| 88 | } |
| 89 | |
| 90 | $lines = preg_split('/\R/', trim($process->getOutput())); |
| 91 | if (!is_array($lines)) { |
| 92 | return []; |
| 93 | } |
| 94 | |
| 95 | return array_map(intval(...), array_filter($lines, static fn (string $line): bool => $line !== '')); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * @return int[]|null null means strategy unavailable |
| 100 | */ |
| 101 | protected function findListeningPidsUsingProc(int $port): ?array { |
| 102 | if (PHP_OS_FAMILY !== 'Linux') { |
| 103 | return null; |
| 104 | } |
| 105 | |
| 106 | if (!is_readable('/proc/net/tcp') && !is_readable('/proc/net/tcp6')) { |
| 107 | return null; |
| 108 | } |
| 109 | |
| 110 | $inodesByPort = $this->getListeningSocketInodesByPort($port); |
| 111 | if (empty($inodesByPort)) { |
| 112 | return []; |
| 113 | } |
| 114 | |
| 115 | $fdPaths = $this->getProcFdPaths(); |
| 116 | if ($fdPaths === []) { |
| 117 | return []; |
| 118 | } |
| 119 | |
| 120 | $pids = []; |
| 121 | foreach ($fdPaths as $fdPath) { |
| 122 | $target = $this->readProcFdTarget($fdPath); |
| 123 | if (!is_string($target) || !preg_match('/^socket:\\[(\\d+)\\]$/', $target, $matches)) { |
| 124 | continue; |
| 125 | } |
| 126 | |
| 127 | $inode = $matches[1] ?? ''; |
| 128 | if ($inode === '' || !isset($inodesByPort[$inode])) { |
| 129 | continue; |
| 130 | } |
| 131 | |
| 132 | if (preg_match('#^/proc/([0-9]+)/fd/[0-9]+$#', $fdPath, $pidMatches)) { |
| 133 | $pids[] = (int)$pidMatches[1]; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | return $pids; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * @return list<string> |
| 142 | */ |
| 143 | protected function getProcFdPaths(): array { |
| 144 | $fdPaths = glob('/proc/[0-9]*/fd/[0-9]*'); |
| 145 | if (!is_array($fdPaths)) { |
| 146 | return []; |
| 147 | } |
| 148 | |
| 149 | return array_values($fdPaths); |
| 150 | } |
| 151 | |
| 152 | protected function readProcFdTarget(string $fdPath): ?string { |
| 153 | set_error_handler(static function (): bool { |
| 154 | return true; |
| 155 | }); |
| 156 | |
| 157 | try { |
| 158 | $target = readlink($fdPath); |
| 159 | } finally { |
| 160 | restore_error_handler(); |
| 161 | } |
| 162 | |
| 163 | return is_string($target) ? $target : null; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * @return array<string, true> |
| 168 | */ |
| 169 | protected function getListeningSocketInodesByPort(int $port): array { |
| 170 | $portHex = strtoupper(str_pad(dechex($port), 4, '0', STR_PAD_LEFT)); |
| 171 | $inodes = []; |
| 172 | |
| 173 | foreach (['/proc/net/tcp', '/proc/net/tcp6'] as $path) { |
| 174 | foreach ($this->readListeningInodesFromProcTable($path, $portHex) as $inode) { |
| 175 | $inodes[$inode] = true; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | return $inodes; |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * @return string[] |
| 184 | */ |
| 185 | protected function readListeningInodesFromProcTable(string $path, string $portHex): array { |
| 186 | if (!is_readable($path)) { |
| 187 | return []; |
| 188 | } |
| 189 | |
| 190 | $lines = file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES); |
| 191 | if (!is_array($lines) || count($lines) <= 1) { |
| 192 | return []; |
| 193 | } |
| 194 | |
| 195 | $inodes = []; |
| 196 | foreach (array_slice($lines, 1) as $line) { |
| 197 | $columns = preg_split('/\s+/', trim($line)); |
| 198 | if (!is_array($columns) || count($columns) < 10) { |
| 199 | continue; |
| 200 | } |
| 201 | |
| 202 | $localAddress = $columns[1]; |
| 203 | $state = $columns[3]; |
| 204 | $inode = $columns[9] ?? ''; |
| 205 | |
| 206 | if ($state !== '0A' || !is_string($inode) || $inode === '') { |
| 207 | continue; |
| 208 | } |
| 209 | |
| 210 | $addressParts = explode(':', $localAddress); |
| 211 | if (count($addressParts) !== 2) { |
| 212 | continue; |
| 213 | } |
| 214 | |
| 215 | if (strtoupper($addressParts[1]) !== $portHex) { |
| 216 | continue; |
| 217 | } |
| 218 | |
| 219 | $inodes[] = $inode; |
| 220 | } |
| 221 | |
| 222 | return $inodes; |
| 223 | } |
| 224 | |
| 225 | protected function commandIsAvailable(string $command): bool { |
| 226 | $process = $this->createProcess(['/bin/sh', '-lc', 'command -v ' . escapeshellarg($command) . ' >/dev/null 2>&1']); |
| 227 | $process->run(); |
| 228 | return $process->isSuccessful(); |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * @param string[] $command |
| 233 | */ |
| 234 | protected function createProcess(array $command): Process { |
| 235 | return new Process($command); |
| 236 | } |
| 237 | } |