This section describes the options of the telegram() destination in syslog-ng OSE.

The telegram() destination has the following options:

bot-id()

Type: number
Default: N/A

Description: This is a required option. Specifies the token for the bot necessary to access the Telegram HTTP API.

chat-id()

Type: number
Default: N/A

Description: This is a required option. Specifies the ID of the chat of the telegram destination.

disable_notification()

Type: boolean
Default: true | false

Description: Enables the telegram() destination to send silent messages. By default, the disable_notification() value is false.

Example: using the disable_notification() option with the telegram() destination

The following example illustrates how you can configure the disable_notification()option to send silent messages to the telegram() destination.

destination {
  telegram(
    bot-id(...)
    chat-id(...) 
    disable_notification(true)
  ); 
};

disable-web-page-preview()

Type: boolean
Default: true

Description: Disables link previews for links in the message. By default, the disable-web-page-preview value is true. From a security point of view, One Identity recommends to leave it true, otherwise malicious messages can trick the telegram destination to generate traffic to any URL.

hook-commands()

Description: This option makes it possible to execute external programs when the relevant driver is initialized or torn down. The hook-commands() can be used with all source and destination drivers with the exception of the usertty() and internal() drivers.

NOTE: The syslog-ng OSE application must be able to start and restart the external program, and have the necessary permissions to do so. For example, if your host is running AppArmor or SELinux, you might have to modify your AppArmor or SELinux configuration to enable syslog-ng OSE to execute external applications.

Using the hook-commands() when syslog-ng OSE starts or stops

To execute an external program when syslog-ng OSE starts or stops, use the following options:

startup()

Type: string
Default: N/A

Description: Defines the external program that is executed as syslog-ng OSE starts.

shutdown()

Type: string
Default: N/A

Description: Defines the external program that is executed as syslog-ng OSE stops.

Using the hook-commands() when syslog-ng OSE reloads

To execute an external program when the syslog-ng OSE configuration is initiated or torn down, for example, on startup/shutdown or during a syslog-ng OSE reload, use the following options:

setup()

Type: string
Default: N/A

Description: Defines an external program that is executed when the syslog-ng OSE configuration is initiated, for example, on startup or during a syslog-ng OSE reload.

teardown()

Type: string
Default: N/A

Description: Defines an external program that is executed when the syslog-ng OSE configuration is stopped or torn down, for example, on shutdown or during a syslog-ng OSE reload.

Example: Using the hook-commands() with a network source

In the following example, the hook-commands() is used with the network() driver and it opens an iptables port automatically as syslog-ng OSE is started/stopped.

The assumption in this example is that the LOGCHAIN chain is part of a larger ruleset that routes traffic to it. Whenever the syslog-ng OSE created rule is there, packets can flow, otherwise the port is closed.

source {
    network(transport(udp)
        hook-commands(
          startup("iptables -I LOGCHAIN 1 -p udp --dport 514 -j ACCEPT")
          shutdown("iptables -D LOGCHAIN 1")
        )
      );
};

parse-mode()

Type: string
Default: none

Description: Formats the message in a markdown-style or HTML-style formatting. By default, the parse-mode value is markdown, which means that the message is formatted in markdown style.

template()

Type: string
Default: ${MESSAGE} \")

Description: Specifies the content of the message. The syslog-ng OSE application will automatically encode the content of this option using the url-encode() template function.

time-reopen()

Accepted values: number [seconds]
Default: 60

Description: The time to wait in seconds before a dead connection is reestablished.

throttle()

Type: number
Default: 0

Description: Sets the maximum number of messages sent to the destination per second. Use this output-rate-limiting functionality only when using disk-buffer as well to avoid the risk of losing messages. Specifying 0 or a lower value sets the output limit to unlimited.

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