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Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044138 by Neo on Saturday 15th of February 2020 02:28:08 AM
Old 02-15-2020
Next:

I have some old "cyberspace situational awareness" PHP code I used for a visualization project a few years ago, which captures and stores details information on web session activity; this code has proven handy identifying rouge bots in the past.

So, I have modified that code to capture and store detailed session information, including the number of hits per IP address, the user agent string, country code, etc. when the 1 minute load average is above 20 and less than 50.

Code:
$theload = getLoadAvg();
if (floatval($theload) > 20.0 && floatval($theload) < 50.0) 
{
  /// the old CSA code to parse web session activity and store the results in the DB
}

So, let's see what happens the next time we get a spike... this should be interesting.


Code:
mysql> describe neo_csa_session_manager;
+--------------+------------------+------+-----+---------+----------------+
| Field        | Type             | Null | Key | Default | Extra          |
+--------------+------------------+------+-----+---------+----------------+
| id           | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| user_id      | int(11)          | NO   | MUL | 0       |                |
| session_id   | varchar(255)     | NO   |     | NULL    |                |
| url          | text             | NO   |     | NULL    |                |
| ip_address   | varchar(45)      | NO   | MUL | NULL    |                |
| user_agent   | varchar(255)     | NO   |     | NULL    |                |
| bot_flag     | tinyint(1)       | NO   |     | 0       |                |
| robot_txt    | mediumint(6)     | NO   |     | 0       |                |
| sitemap      | mediumint(6)     | NO   |     | 0       |                |
| riskscore    | int(11)          | NO   |     | 0       |                |
| country_iso2 | varchar(2)       | NO   |     | UN      |                |
| country      | varchar(50)      | NO   |     | UNKNOWN |                |
| hitcount     | int(10) unsigned | NO   |     | 1       |                |
| firstseen    | bigint(11)       | NO   |     | NULL    |                |
| unixtime     | bigint(11)       | YES  |     | NULL    |                |
| longitude    | float            | NO   |     | 0       |                |
| latitude     | float            | NO   |     | 0       |                |
+--------------+------------------+------+-----+---------+----------------+
17 rows in set (0.00 sec)

This User Gave Thanks to Neo For This Post:
 

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MSSQL_BIND(3)															     MSSQL_BIND(3)

mssql_bind - Adds a parameter to a stored procedure or a remote stored procedure

SYNOPSIS
bool mssql_bind (resource $stmt, string $param_name, mixed &$var, int $type, [bool $is_output = false], [bool $is_null = false], [int $maxlen = -1]) DESCRIPTION
Binds a parameter to a stored procedure or a remote stored procedure. PARAMETERS
o $stmt - Statement resource, obtained with mssql_init(3). o $param_name - The parameter name, as a string. Note You have to include the @ character, like in the T-SQL syntax. See the explanation included in mssql_execute(3). o $var - The PHP variable you'll bind the MSSQL parameter to. It is passed by reference, to retrieve OUTPUT and RETVAL values after the procedure execution. o $type - One of: SQLTEXT, SQLVARCHAR, SQLCHAR, SQLINT1, SQLINT2, SQLINT4, SQLBIT, SQLFLT4, SQLFLT8, SQLFLTN. o $is_output - Whether the value is an OUTPUT parameter or not. If it's an OUTPUT parameter and you don't mention it, it will be treated as a normal input parameter and no error will be thrown. o $is_null - Whether the parameter is NULL or not. Passing the NULL value as $var will not do the job. o $maxlen - Used with char/varchar values. You have to indicate the length of the data so if the parameter is a varchar(50), the type must be SQLVARCHAR and this value 50. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 mssql_bind(3) example <?php // Connect to MSSQL and select the database mssql_connect('KALLESPCSQLEXPRESS', 'sa', 'phpfi'); mssql_select_db('php'); // Create a new stored prodecure $stmt = mssql_init('NewUserRecord'); // Bind the field names mssql_bind($stmt, '@username', 'Kalle', SQLVARCHAR, false, false, 60); mssql_bind($stmt, '@name', 'Kalle', SQLVARCHAR, false, false, 60); mssql_bind($stmt, '@age', 19, SQLINT1, false, false, 3); // Execute mssql_execute($stmt); // Free statement mssql_free_statement($stmt); ?> SEE ALSO
mssql_execute(3), mssql_free_statement(3), mssql_init(3). PHP Documentation Group MSSQL_BIND(3)
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