spawn   Début   Suivant   Sommaire   Préc.page.lue   Accueil
Section: Maintenance Commands (8)
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NAME   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
spawn - Postfix external command spawner  



SYNOPSIS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
spawn [generic Postfix daemon options] command_attributes...
 



DESCRIPTION   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
The spawn(8) daemon provides the Postfix equivalent of inetd. It listens on a port as specified in the Postfix master.cf file and spawns an external command whenever a connection is established. The connection can be made over local IPC (such as UNIX-domain sockets) or over non-local IPC (such as TCP sockets). The command's standard input, output and error streams are connected directly to the communication endpoint.

This daemon expects to be run from the master(8) process manager.  




COMMAND ATTRIBUTE SYNTAX   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


The external command attributes are given in the master.cf
file at the end of a service definition.  The syntax is as follows:
user=username (required)
user=username:groupname
The external command is executed with the rights of the specified username. The software refuses to execute commands with root privileges, or with the privileges of the mail system owner. If groupname is specified, the corresponding group ID is used instead of the group ID of username.
argv=command... (required)
The command to be executed. This must be specified as the last command attribute. The command is executed directly, i.e. without interpretation of shell meta characters by a shell command interpreter.
 



BUGS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
In order to enforce standard Postfix process resource controls, the spawn(8) daemon runs only one external command at a time. As such, it presents a noticeable overhead by wasting precious process resources. The spawn(8) daemon is expected to be replaced by a more structural solution.  



DIAGNOSTICS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
The spawn(8) daemon reports abnormal child exits. Problems are logged to syslogd(8).  



SECURITY   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil



This program needs root privilege in order to execute external
commands as the specified user. It is therefore security sensitive.
However the spawn(8) daemon does not talk to the external command
and thus is not vulnerable to data-driven attacks.
 



CONFIGURATION PARAMETERS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


Changes to main.cf are picked up automatically as spawn(8)
processes run for only a limited amount of time. Use the command
"postfix reload" to speed up a change.

The text below provides only a parameter summary. See postconf(5) for more details including examples.

In the text below, transport is the first field of the entry in the master.cf file.  




RESOURCE AND RATE CONTROL   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


transport_time_limit ($command_time_limit)
The amount of time the command is allowed to run before it is terminated.

Postfix 2.4 and later support a suffix that specifies the time unit: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is seconds.

 



MISCELLANEOUS   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


config_directory (see 'postconf -d' output)
The default location of the Postfix main.cf and master.cf configuration files.
daemon_timeout (18000s)
How much time a Postfix daemon process may take to handle a request before it is terminated by a built-in watchdog timer.
export_environment (see 'postconf -d' output)
The list of environment variables that a Postfix process will export to non-Postfix processes.
ipc_timeout (3600s)
The time limit for sending or receiving information over an internal communication channel.
mail_owner (postfix)
The UNIX system account that owns the Postfix queue and most Postfix daemon processes.
max_idle (100s)
The maximum amount of time that an idle Postfix daemon process waits for an incoming connection before terminating voluntarily.
max_use (100)
The maximal number of incoming connections that a Postfix daemon process will service before terminating voluntarily.
process_id (read-only)
The process ID of a Postfix command or daemon process.
process_name (read-only)
The process name of a Postfix command or daemon process.
queue_directory (see 'postconf -d' output)
The location of the Postfix top-level queue directory.
syslog_facility (mail)
The syslog facility of Postfix logging.
syslog_name (postfix)
The mail system name that is prepended to the process name in syslog records, so that "smtpd" becomes, for example, "postfix/smtpd".
 



SEE ALSO   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
postconf(5), configuration parameters
master(8), process manager
syslogd(8), system logging
 



LICENSE   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil


The Secure Mailer license must be distributed with this software.
 



AUTHOR(S)   Début   Précédent   Suivant   Sommaire   Préc.page.lue   Accueil
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA


 



Sommaire   Début   Suivant   Sommaire   Préc.page.lue   Accueil
NAME
SYNOPSIS
DESCRIPTION
COMMAND ATTRIBUTE SYNTAX
BUGS
DIAGNOSTICS
SECURITY
CONFIGURATION PARAMETERS
RESOURCE AND RATE CONTROL
MISCELLANEOUS
SEE ALSO
LICENSE
AUTHOR(S)

Table des mots clés   Début   Suivant   Sommaire   Préc.page.lue   Accueil
argv=command... (required)COMMAND ATTRIBUTE SYNTAX
config_directory (see 'postconf -d' output)MISCELLANEOUS
daemon_timeout (18000s)MISCELLANEOUS
export_environment (see 'postconf -d' output)MISCELLANEOUS
ipc_timeout (3600s)MISCELLANEOUS
mail_owner (postfix)MISCELLANEOUS
max_idle (100s)MISCELLANEOUS
max_use (100)MISCELLANEOUS
process_id (read-only)MISCELLANEOUS
process_name (read-only)MISCELLANEOUS
queue_directory (see 'postconf -d' output)MISCELLANEOUS
syslog_facility (mail)MISCELLANEOUS
syslog_name (postfix)MISCELLANEOUS
user=username (required)COMMAND ATTRIBUTE SYNTAX
user=username:groupnameCOMMAND ATTRIBUTE SYNTAX



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