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eduardok / libsmbclient-php

smbclient's extension for PHP
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SMB TCP connections are being left open #90

Closed stingray-11 closed 3 years ago

stingray-11 commented 3 years ago

I am using libsmbclient as part of a filesystem server in PHP that I am working on. The server is handling about a dozen requests per second of various filesystem actions, mainly file create/write/delete. I am using mainly PHP fwrapper functions with smb:// and only a few smbclient specific calls (e.g. smbclient_state_init).

After each PHP request, I would expect that libsmbclient would clean up any TCP connections it opened when the script ends, but it seems that it doesn't. While continuously running ~10 requests/second I observed upwards of 700 open TCP connections as shown by netstat -t | grep 'myserver:microsoft' | wc -l. The connection count eventually peaks as it seems that they are being closed after 1-2 minutes.

I have tried adding fclose/smbclient_state_free to my script (normally I just rely on the script ending) but those have not made a difference. I am using PHP-FPM with nginx 1.20.1 and libsmbclient 1.0.6. PHP-FPM might have something to do with it since the PHP process itself does not end after the script does like with other PHP modes.

stingray-11 commented 3 years ago

I was misinterpreting netstat. The TCP connections were closed but in TIME_WAIT which is normal for TCP.