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diff --git a/html/spawn.8.html b/html/spawn.8.html new file mode 100644 index 0000000..51bb904 --- /dev/null +++ b/html/spawn.8.html @@ -0,0 +1,150 @@ +<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" + "http://www.w3.org/TR/html4/loose.dtd"> +<html> <head> +<meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> +<title> Postfix manual - spawn(8) </title> +</head> <body> <pre> +SPAWN(8) SPAWN(8) + +<b>NAME</b> + spawn - Postfix external command spawner + +<b>SYNOPSIS</b> + <b>spawn</b> [generic Postfix daemon options] command_attributes... + +<b>DESCRIPTION</b> + The <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon provides the Postfix equivalent of <b>inetd</b>. It lis- + tens on a port as specified in the Postfix <a href="master.5.html"><b>master.cf</b></a> 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 <a href="master.8.html"><b>master</b>(8)</a> process manager. + +<b>COMMAND ATTRIBUTE SYNTAX</b> + The external command attributes are given in the <a href="master.5.html"><b>master.cf</b></a> file at the + end of a service definition. The syntax is as follows: + + <b>user</b>=<i>username</i> (required) + + <b>user</b>=<i>username</i>:<i>groupname</i> + The external command is executed with the rights of the speci- + fied <i>username</i>. The software refuses to execute commands with + root privileges, or with the privileges of the mail system + owner. If <i>groupname</i> is specified, the corresponding group ID is + used instead of the group ID of <i>username</i>. + + <b>argv</b>=<i>command</i>... (required) + The command to be executed. This must be specified as the last + command attribute. The command is executed directly, i.e. with- + out interpretation of shell meta characters by a shell command + interpreter. + +<b>BUGS</b> + In order to enforce standard Postfix process resource controls, the + <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon runs only one external command at a time. As such, it + presents a noticeable overhead by wasting precious process resources. + The <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon is expected to be replaced by a more structural + solution. + +<b>DIAGNOSTICS</b> + The <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon reports abnormal child exits. Problems are logged + to <b>syslogd</b>(8) or <a href="postlogd.8.html"><b>postlogd</b>(8)</a>. + +<b>SECURITY</b> + This program needs root privilege in order to execute external commands + as the specified user. It is therefore security sensitive. However the + <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon does not talk to the external command and thus is not + vulnerable to data-driven attacks. + +<b>CONFIGURATION PARAMETERS</b> + Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically as <a href="spawn.8.html"><b>spawn</b>(8)</a> processes + run for only a limited amount of time. Use the command "<b>postfix reload</b>" + to speed up a change. + + The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for + more details including examples. + + In the text below, <i>transport</i> is the first field of the entry in the + <a href="master.5.html"><b>master.cf</b></a> file. + +<b>RESOURCE AND RATE CONTROL</b> + <b>transport_time_limit ($<a href="postconf.5.html#command_time_limit">command_time_limit</a>)</b> + A transport-specific override for the <a href="postconf.5.html#command_time_limit">command_time_limit</a> parame- + ter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> name of the message + delivery transport. + +<b>MISCELLANEOUS</b> + <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b> + The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con- + figuration files. + + <b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b> + How much time a Postfix daemon process may take to handle a + request before it is terminated by a built-in watchdog timer. + + <b><a href="postconf.5.html#export_environment">export_environment</a> (see 'postconf -d' output)</b> + The list of environment variables that a Postfix process will + export to non-Postfix processes. + + <b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b> + The time limit for sending or receiving information over an + internal communication channel. + + <b><a href="postconf.5.html#mail_owner">mail_owner</a> (postfix)</b> + The UNIX system account that owns the Postfix queue and most + Postfix daemon processes. + + <b><a href="postconf.5.html#max_idle">max_idle</a> (100s)</b> + The maximum amount of time that an idle Postfix daemon process + waits for an incoming connection before terminating voluntarily. + + <b><a href="postconf.5.html#max_use">max_use</a> (100)</b> + The maximal number of incoming connections that a Postfix daemon + process will service before terminating voluntarily. + + <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b> + The process ID of a Postfix command or daemon process. + + <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b> + The process name of a Postfix command or daemon process. + + <b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b> + The location of the Postfix top-level queue directory. + + <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b> + The syslog facility of Postfix logging. + + <b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b> + A prefix that is prepended to the process name in syslog + records, so that, for example, "smtpd" becomes "prefix/smtpd". + + Available in Postfix 3.3 and later: + + <b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b> + The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process. + +<b>SEE ALSO</b> + <a href="postconf.5.html">postconf(5)</a>, configuration parameters + <a href="master.8.html">master(8)</a>, process manager + <a href="postlogd.8.html">postlogd(8)</a>, Postfix logging + syslogd(8), system logging + +<b>LICENSE</b> + The Secure Mailer license must be distributed with this software. + +<b>AUTHOR(S)</b> + Wietse Venema + IBM T.J. Watson Research + P.O. Box 704 + Yorktown Heights, NY 10598, USA + + Wietse Venema + Google, Inc. + 111 8th Avenue + New York, NY 10011, USA + + SPAWN(8) +</pre> </body> </html> |