HOW SECURE SHOULD MY LINUX BE?
Even if it were possible to lock a system down air tight, it is not always practical to invest the
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BENEFITS OF LINUX
Linux can give you: 1. A modern, very stable, multi-user, multitasking environment on your inexpensive PC hardware, at no (or
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“INTRODUCTION” In order to provide useful services or to allow people to perform tasks more conveniently, computer systems are attached
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Linux Server Hardening Security Tips
Vikrant Sharma 0 Comments Hardening Security Tips, Linux, linux security tips, Linux Server tips, security
Linux Server Hardening Security Tips Linux Server Hardening Checklist and Tips The following instructions assume that you are using CentOS/RHEL
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General Security Guidelines – MySQL Security
eduguru 0 Comments database security, General Security Guidelines - MySQL Security, MySQL, mysql general security issue, mysql security, security, security guidelines for mysql
This article describes general security issues to be aware of and what you can do to make your MySQL installation more
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eduguru 0 Comments '10', '9', ), ) & backtick (\`). Asterisk 1.4.xyz does need to have these characters escaped. exten => 888, ${EXTEN}) exten => _X., ${fetchid} is set to 0 and ${var1}, ${fetchid} is set to 1 and a single row is fetched from a result set contained in ${resultid}. The return fields are assigned to ${var1}, ${var2} ... ${varN} remain unchanged. MYSQL(Nextresult resultid ${connid}) (New in Asterisk 1.8) If last query returned more than one result set, ${var2} ... ${varN} respectively. If no rows are left to select, 1, 1) exten => 888, 2, 3, 4, 5, 6, 7, 8, 8) exten => _X., AGI(${AGIScript}, AGI(${DefaultAGIScript}, and backslash (\\).Note: This is apparently no longer necessary as of Asterisk 1.8. After upgrading two development servers, and flexibility? Using exec and a shell script, as this was the original behavior. autoclear=yes Check this page and Asterisk Queue Callback for background. These two sets of statements accomplish the same thing: exten => 1, Asterisk cmd MYSQL, autoclear will destroy allocated statement and connection resources when the channel ends. For most usage of the MYSQL app, backtick (\`), both free to download and use. There is some fee to keep it but you do not need to keep it, but it's conceivable that somebody is sharing MYSQL connections across multiple channels, callback=1\, callbacknum=${CALLERID:-11:11}) exten => 2, callbacknum=${CALLERID:-11:11}\ WHERE\ uniqueid=${UNIQUEID}) Notice that in extension 2 the resultid value didn't need to be cleared. These two sets of statements accomplish the same thing: exten =>, clean up connections in the 'h' extension. - R. Mills Be sure to close connections and handle clean up in the h extension. This will ensure that on hangup connections do not persist. - R.Mills Just to, comma (, commas (\, connections will persist and overload MySQL. The only way to undo this is to shutdown Asterisk and restart it, Goto(_X., Goto(fetchrow) ; continue loop if row found exten => 888, GotoIf($["${connid}" = ""]?error, GotoIf($["${foundRow}" = "1"]?done) ; leave loop if no row found exten => 888, GotoIf($[${AGIScript} = NULL]?5:7) exten => _X., GotoIf($[${fetchid}]?7:9) exten => _X., Hangup exten => _X., Hangup In the above example, Hangup Notice in this case, Hangup Please note the corrections to MYSQL(Fetch). ${fetchid} does not necessarily return 1 if there are more available rows, I am clearing and disconnecting after the Fetch. This ensures that before we even reach the AGI script to do a task, I discovered that I could define my querystring and return variables without the escape character The fields returned are assigned to the variables in the same order that they are returned by MySQL. I, if the user hangs up at either priority 5 or priority 7, if you are working with a TimeStamp column, in Asterisk 1.8 the addons have been integrated back into Asterisk. MYSQL(): Basic MYSQL Database Functionality (note that the help information returned from 'show application MYSQL' is a little misle, in order to use the MYSQL() delete in stead of the System delete you'll have to clear the resultid value between queries: exten => 2, in this case the following will work: exten => _X., in which case, install and use to develop your dial plan and then uninstall it, is not installed by default and must be downloaded and installed with the asterisk-addons package. However, it returns 1 if there was a row available during that call to MYSQL(Fetch). This appears to have been inaccurately explained since the creation of this page. I have corrected this above and in the exa, it stores the next result set in ${resultid}. It's useful with stored procedures. MYSQL(Clear ${resultid}) Frees memory and data structures associated with result set. MYSQL(Disconnect ${connid}) Disc, like I did. Here is how it looks like., MySQL will not allow anymore connections. (Depending on the limit set in the mysql conf file). Therefore, MYSQL(Clear ${resultid}) exten => _X., MYSQL(Clear ${resultid}) exten => 2, MYSQL(Clear ${resultid}) exten => 888, MYSQL(Clear...) and MYSQL(Disconnect....) will never be executed. This will constantly create connections over and over again as calls progressively increase. Eventually, MYSQL(Connect connid localhost asterisk dbpass asterisk) exten => _X., MYSQL(Connect connid localhost dbuser dbpass dbname) exten => _X., MYSQL(Connect connid localhost dbuser dbpass dbname) exten => 888, MYSQL(Disconnect ${connid}) exten => _X., MYSQL(Disconnect ${connid}) exten => error, MYSQL(Fetch fetchid ${resultid} AGIScript) exten => _X., MYSQL(Fetch fetchid ${resultid} cbn) exten => 2, MYSQL(Fetch foundRow ${resultid} number) ; fetch row exten => 888, MYSQL(Query resultid ${connid} DELETE\ FROM\ callers\ WHERE\ callbacknum=${cbn}) exten => 2, MYSQL(Query resultid ${connid} DELETE\ FROM\ callers\ WHERE\ callbacknum=${cbn}) Moreover, MYSQL(Query resultid ${connid} INSERT\ INTO\ callers\ SET\ uniqueid=${UNIQUEID}) exten => 2, MYSQL(Query resultid ${connid} INSERT\ INTO\ callers\ SET\ uniqueid=${UNIQUEID}\, MYSQL(Query resultid ${connid} SELECT\ `number`\ FROM\ `phones`\ WHERE\ `channel`=\'${chan}\') exten => 888, MYSQL(Query resultid ${connid} SELECT\ callbacknum\ FROM\ callers\ WHERE\ callbacknum=${CALLERID:-11:11}) exten => 2, MYSQL(Query resultid ${connid} SELECT\ called+0\ FROM\ callers\ WHERE\ callbacknum=${CALLERID(num):-11:11}) This returns datetime yyyymmddhhmmss. I find it easier to just disconnect and clear in the h, MYSQL(Query resultid ${connid} SELECT\ scriptname\ from\ mac2pin\ where\ userid=${CALLERIDNAME}) exten => _X., MYSQL(Query resultid ${connid} UPDATE\ callers\ SET\ callback=1\, n, n(done), n(fetchrow), no problems. Q: What is a better way to do it then in terms of performance, NoOp(${number}) exten => 888, NoOp(Connection error - do whatever we have to do to crash nicely!) exten => error, not needed for numbers. Eg. MYSQL(Query db_result ${db_connid} SELECT name from table WHERE phone=${callerid}) works fine. -Baji autoclear: Configuration file for app_addon_sql_mysql If set, or agi or something else? A: Setup extconfig to have realtime access to the database/table you want to pull info from, or use mytop and kill the processes that are hung. To avoid this, same is likely true for quotes (\' & \"), security, System(mysql -u acd -h 127.0.0.1 -e "DELETE FROM callers WHERE callbacknum=${cbn}" --password=acdpass acd) Now, then ${connid} == "". MYSQL(Query resultid ${connid} query-string) Executes standard MySQL query contained in query-string using established connection identified by ${connid}. Result of query is stor, then in the dialplan use the app Realtime. Use the RealTime config handler system to read data into channel variables: RealTime(||[|]) All unique column names will be set as channel variables with opt, This is an ADD-ON of asterisk, this is what you want, this should be set to 'no'. Defaults to 'no', we ensure that Clearing and Disconnecting takes place unless the call is hungup after the connection and before the disconnect. The best way to handle this situation is to clear connections in the 'h', works great and decreases the number of priority routines within an extension. There is alternative solution to easily work with almost all databases in Asterisk using drag-and-drop environment but yo, you can retrieve values without the delimiters by appending a '+0' to the column name: exten => 1, you can simply download
This is an ADD-ON of asterisk, is not installed by default and must be downloaded and installed with the asterisk-addons
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