/* $NetBSD: qmgr.c,v 1.2 2017/02/14 01:16:46 christos Exp $ */
/*++
/* NAME
/* qmgr 8
/* SUMMARY
/* old Postfix queue manager
/* SYNOPSIS
/* \fBqmgr\fR [generic Postfix daemon options]
/* DESCRIPTION
/* The \fBqmgr\fR(8) daemon awaits the arrival of incoming mail
/* and arranges for its delivery via Postfix delivery processes.
/* The actual mail routing strategy is delegated to the
/* \fBtrivial-rewrite\fR(8) daemon.
/* This program expects to be run from the \fBmaster\fR(8) process
/* manager.
/*
/* Mail addressed to the local \fBdouble-bounce\fR address is
/* logged and discarded. This stops potential loops caused by
/* undeliverable bounce notifications.
/* MAIL QUEUES
/* .ad
/* .fi
/* The \fBqmgr\fR(8) daemon maintains the following queues:
/* .IP \fBincoming\fR
/* Inbound mail from the network, or mail picked up by the
/* local \fBpickup\fR(8) agent from the \fBmaildrop\fR directory.
/* .IP \fBactive\fR
/* Messages that the queue manager has opened for delivery. Only
/* a limited number of messages is allowed to enter the \fBactive\fR
/* queue (leaky bucket strategy, for a fixed delivery rate).
/* .IP \fBdeferred\fR
/* Mail that could not be delivered upon the first attempt. The queue
/* manager implements exponential backoff by doubling the time between
/* delivery attempts.
/* .IP \fBcorrupt\fR
/* Unreadable or damaged queue files are moved here for inspection.
/* .IP \fBhold\fR
/* Messages that are kept "on hold" are kept here until someone
/* sets them free.
/* DELIVERY STATUS REPORTS
/* .ad
/* .fi
/* The \fBqmgr\fR(8) daemon keeps an eye on per-message delivery status
/* reports in the following directories. Each status report file has
/* the same name as the corresponding message file:
/* .IP \fBbounce\fR
/* Per-recipient status information about why mail is bounced.
/* These files are maintained by the \fBbounce\fR(8) daemon.
/* .IP \fBdefer\fR
/* Per-recipient status information about why mail is delayed.
/* These files are maintained by the \fBdefer\fR(8) daemon.
/* .IP \fBtrace\fR
/* Per-recipient status information as requested with the
/* Postfix "\fBsendmail -v\fR" or "\fBsendmail -bv\fR" command.
/* These files are maintained by the \fBtrace\fR(8) daemon.
/* .PP
/* The \fBqmgr\fR(8) daemon is responsible for asking the
/* \fBbounce\fR(8), \fBdefer\fR(8) or \fBtrace\fR(8) daemons to
/* send delivery reports.
/* STRATEGIES
/* .ad
/* .fi
/* The queue manager implements a variety of strategies for
/* either opening queue files (input) or for message delivery (output).
/* .IP "\fBleaky bucket\fR"
/* This strategy limits the number of messages in the \fBactive\fR queue
/* and prevents the queue manager from running out of memory under
/* heavy load.
/* .IP \fBfairness\fR
/* When the \fBactive\fR queue has room, the queue manager takes one
/* message from the \fBincoming\fR queue and one from the \fBdeferred\fR
/* queue. This prevents a large mail backlog from blocking the delivery
/* of new mail.
/* .IP "\fBslow start\fR"
/* This strategy eliminates "thundering herd" problems by slowly
/* adjusting the number of parallel deliveries to the same destination.
/* .IP "\fBround robin\fR"
/* The queue manager sorts delivery requests by destination.
/* Round-robin selection prevents one destination from dominating
/* deliveries to other destinations.
/* .IP "\fBexponential backoff\fR"
/* Mail that cannot be delivered upon the first attempt is deferred.
/* The time interval between delivery attempts is doubled after each
/* attempt.
/* .IP "\fBdestination status cache\fR"
/* The queue manager avoids unnecessary delivery attempts by
/* maintaining a short-term, in-memory list of unreachable destinations.
/* TRIGGERS
/* .ad
/* .fi
/* On an idle system, the queue manager waits for the arrival of
/* trigger events, or it waits for a timer to go off. A trigger
/* is a one-byte message.
/* Depending on the message received, the queue manager performs
/* one of the following actions (the message is followed by the
/* symbolic constant used internally by the software):
/* .IP "\fBD (QMGR_REQ_SCAN_DEFERRED)\fR"
/* Start a deferred queue scan. If a deferred queue scan is already
/* in progress, that scan will be restarted as soon as it finishes.
/* .IP "\fBI (QMGR_REQ_SCAN_INCOMING)\fR"
/* Start an incoming queue scan. If an incoming queue scan is already
/* in progress, that scan will be restarted as soon as it finishes.
/* .IP "\fBA (QMGR_REQ_SCAN_ALL)\fR"
/* Ignore deferred queue file time stamps. The request affects
/* the next deferred queue scan.
/* .IP "\fBF (QMGR_REQ_FLUSH_DEAD)\fR"
/* Purge all information about dead transports and destinations.
/* .IP "\fBW (TRIGGER_REQ_WAKEUP)\fR"
/* Wakeup call, This is used by the master server to instantiate
/* servers that should not go away forever. The action is to start
/* an incoming queue scan.
/* .PP
/* The \fBqmgr\fR(8) daemon reads an entire buffer worth of triggers.
/* Multiple identical trigger requests are collapsed into one, and
/* trigger requests are sorted so that \fBA\fR and \fBF\fR precede
/* \fBD\fR and \fBI\fR. Thus, in order to force a deferred queue run,
/* one would request \fBA F D\fR; in order to notify the queue manager
/* of the arrival of new mail one would request \fBI\fR.
/* STANDARDS
/* RFC 3463 (Enhanced status codes)
/* RFC 3464 (Delivery status notifications)
/* SECURITY
/* .ad
/* .fi
/* The \fBqmgr\fR(8) daemon is not security sensitive. It reads
/* single-character messages from untrusted local users, and thus may
/* be susceptible to denial of service attacks. The \fBqmgr\fR(8) daemon
/* does not talk to the outside world, and it can be run at fixed low
/* privilege in a chrooted environment.
/* DIAGNOSTICS
/* Problems and transactions are logged to the \fBsyslog\fR(8) daemon.
/* Corrupted message files are saved to the \fBcorrupt\fR queue
/* for further inspection.
/*
/* Depending on the setting of the \fBnotify_classes\fR parameter,
/* the postmaster is notified of bounces and of other trouble.
/* BUGS
/* A single queue manager process has to compete for disk access with
/* multiple front-end processes such as \fBcleanup\fR(8). A sudden burst of
/* inbound mail can negatively impact outbound delivery rates.
/* CONFIGURATION PARAMETERS
/* .ad
/* .fi
/* Changes to \fBmain.cf\fR are not picked up automatically,
/* as \fBqmgr\fR(8)
/* is a persistent process. Use the command "\fBpostfix reload\fR" after
/* a configuration change.
/*
/* The text below provides only a parameter summary. See
/* \fBpostconf\fR(5) for more details including examples.
/*
/* In the text below, \fItransport\fR is the first field in a
/* \fBmaster.cf\fR entry.
/* COMPATIBILITY CONTROLS
/* .ad
/* .fi
/* Available before Postfix version 2.5:
/* .IP "\fBallow_min_user (no)\fR"
/* Allow a sender or recipient address to have `-' as the first
/* character.
/* .PP
/* Available with Postfix version 2.7 and later:
/* .IP "\fBdefault_filter_nexthop (empty)\fR"
/* When a content_filter or FILTER request specifies no explicit
/* next-hop destination, use $default_filter_nexthop instead; when
/* that value is empty, use the domain in the recipient address.
/* ACTIVE QUEUE CONTROLS
/* .ad
/* .fi
/* .IP "\fBqmgr_clog_warn_time (300s)\fR"
/* The minimal delay between warnings that a specific destination is
/* clogging up the Postfix active queue.
/* .IP "\fBqmgr_message_active_limit (20000)\fR"
/* The maximal number of messages in the active queue.
/* .IP "\fBqmgr_message_recipient_limit (20000)\fR"
/* The maximal number of recipients held in memory by the Postfix
/* queue manager, and the maximal size of the short-term,
/* in-memory "dead" destination status cache.
/* DELIVERY CONCURRENCY CONTROLS
/* .ad
/* .fi
/* .IP "\fBqmgr_fudge_factor (100)\fR"
/* Obsolete feature: the percentage of delivery resources that a busy
/* mail system will use up for delivery of a large mailing list
/* message.
/* .IP "\fBinitial_destination_concurrency (5)\fR"
/* The initial per-destination concurrency level for parallel delivery
/* to the same destination.
/* .IP "\fBdefault_destination_concurrency_limit (20)\fR"
/* The default maximal number of parallel deliveries to the same
/* destination.
/* .IP "\fItransport\fB_destination_concurrency_limit ($default_destination_concurrency_limit)\fR"
/* Idem, for delivery via the named message \fItransport\fR.
/* .PP
/* Available in Postfix version 2.5 and later:
/* .IP "\fItransport\fB_initial_destination_concurrency ($initial_destination_concurrency)\fR"
/* Initial concurrency for delivery via the named message
/* \fItransport\fR.
/* .IP "\fBdefault_destination_concurrency_failed_cohort_limit (1)\fR"
/* How many pseudo-cohorts must suffer connection or handshake
/* failure before a specific destination is considered unavailable
/* (and further delivery is suspended).
/* .IP "\fItransport\fB_destination_concurrency_failed_cohort_limit ($default_destination_concurrency_failed_cohort_limit)\fR"
/* Idem, for delivery via the named message \fItransport\fR.
/* .IP "\fBdefault_destination_concurrency_negative_feedback (1)\fR"
/* The per-destination amount of delivery concurrency negative
/* feedback, after a delivery completes with a connection or handshake
/* failure.
/* .IP "\fItransport\fB_destination_concurrency_negative_feedback ($default_destination_concurrency_negative_feedback)\fR"
/* Idem, for delivery via the named message \fItransport\fR.
/* .IP "\fBdefault_destination_concurrency_positive_feedback (1)\fR"
/* The per-destination amount of delivery concurrency positive
/* feedback, after a delivery completes without connection or handshake
/* failure.
/* .IP "\fItransport\fB_destination_concurrency_positive_feedback ($default_destination_concurrency_positive_feedback)\fR"
/* Idem, for delivery via the named message \fItransport\fR.
/* .IP "\fBdestination_concurrency_feedback_debug (no)\fR"
/* Make the queue manager's feedback algorithm verbose for performance
/* analysis purposes.
/* RECIPIENT SCHEDULING CONTROLS
/* .ad
/* .fi
/* .IP "\fBdefault_destination_recipient_limit (50)\fR"
/* The default maximal number of recipients per message delivery.
/* .IP \fItransport\fB_destination_recipient_limit\fR
/* Idem, for delivery via the named message \fItransport\fR.
/* OTHER RESOURCE AND RATE CONTROLS
/* .ad
/* .fi
/* .IP "\fBminimal_backoff_time (300s)\fR"
/* The minimal time between attempts to deliver a deferred message;
/* prior to Postfix 2.4 the default value was 1000s.
/* .IP "\fBmaximal_backoff_time (4000s)\fR"
/* The maximal time between attempts to deliver a deferred message.
/* .IP "\fBmaximal_queue_lifetime (5d)\fR"
/* Consider a message as undeliverable, when delivery fails with a
/* temporary error, and the time in the queue has reached the
/* maximal_queue_lifetime limit.
/* .IP "\fBqueue_run_delay (300s)\fR"
/* The time between deferred queue scans by the queue manager;
/* prior to Postfix 2.4 the default value was 1000s.
/* .IP "\fBtransport_retry_time (60s)\fR"
/* The time between attempts by the Postfix queue manager to contact
/* a malfunctioning message delivery transport.
/* .PP
/* Available in Postfix version 2.1 and later:
/* .IP "\fBbounce_queue_lifetime (5d)\fR"
/* Consider a bounce message as undeliverable, when delivery fails
/* with a temporary error, and the time in the queue has reached the
/* bounce_queue_lifetime limit.
/* .PP
/* Available in Postfix version 2.5 and later:
/* .IP "\fBdefault_destination_rate_delay (0s)\fR"
/* The default amount of delay that is inserted between individual
/* deliveries to the same destination; the resulting behavior depends
/* on the value of the corresponding per-destination recipient limit.
/* .IP "\fItransport\fB_destination_rate_delay $default_destination_rate_delay\fR"
/* Idem, for delivery via the named message \fItransport\fR.
/* .PP
/* Available in Postfix version 3.1 and later:
/* .IP "\fBdefault_transport_rate_delay (0s)\fR"
/* The default amount of delay that is inserted between individual
/* deliveries over the same message delivery transport, regardless of
/* destination.
/* .IP "\fItransport\fB_transport_rate_delay $default_transport_rate_delay\fR"
/* Idem, for delivery via the named message \fItransport\fR.
/* SAFETY CONTROLS
/* .ad
/* .fi
/* .IP "\fBqmgr_daemon_timeout (1000s)\fR"
/* How much time a Postfix queue manager process may take to handle
/* a request before it is terminated by a built-in watchdog timer.
/* .IP "\fBqmgr_ipc_timeout (60s)\fR"
/* The time limit for the queue manager to send or receive information
/* over an internal communication channel.
/* .PP
/* Available in Postfix version 3.1 and later:
/* .IP "\fBaddress_verify_pending_request_limit (see 'postconf -d' output)\fR"
/* A safety limit that prevents address verification requests from
/* overwhelming the Postfix queue.
/* MISCELLANEOUS CONTROLS
/* .ad
/* .fi
/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR"
/* The default location of the Postfix main.cf and master.cf
/* configuration files.
/* .IP "\fBdefer_transports (empty)\fR"
/* The names of message delivery transports that should not deliver mail
/* unless someone issues "\fBsendmail -q\fR" or equivalent.
/* .IP "\fBdelay_logging_resolution_limit (2)\fR"
/* The maximal number of digits after the decimal point when logging
/* sub-second delay values.
/* .IP "\fBhelpful_warnings (yes)\fR"
/* Log warnings about problematic configuration settings, and provide
/* helpful suggestions.
/* .IP "\fBprocess_id (read-only)\fR"
/* The process ID of a Postfix command or daemon process.
/* .IP "\fBprocess_name (read-only)\fR"
/* The process name of a Postfix command or daemon process.
/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR"
/* The location of the Postfix top-level queue directory.
/* .IP "\fBsyslog_facility (mail)\fR"
/* The syslog facility of Postfix logging.
/* .IP "\fBsyslog_name (see 'postconf -d' output)\fR"
/* The mail system name that is prepended to the process name in syslog
/* records, so that "smtpd" becomes, for example, "postfix/smtpd".
/* .PP
/* Available in Postfix version 3.0 and later:
/* .IP "\fBconfirm_delay_cleared (no)\fR"
/* After sending a "your message is delayed" notification, inform
/* the sender when the delay clears up.
/* FILES
/* /var/spool/postfix/incoming, incoming queue
/* /var/spool/postfix/active, active queue
/* /var/spool/postfix/deferred, deferred queue
/* /var/spool/postfix/bounce, non-delivery status
/* /var/spool/postfix/defer, non-delivery status
/* /var/spool/postfix/trace, delivery status
/* SEE ALSO
/* trivial-rewrite(8), address routing
/* bounce(8), delivery status reports
/* postconf(5), configuration parameters
/* master(5), generic daemon options
/* master(8), process manager
/* syslogd(8), system logging
/* README FILES
/* .ad
/* .fi
/* Use "\fBpostconf readme_directory\fR" or
/* "\fBpostconf html_directory\fR" to locate this information.
/* .na
/* .nf
/* QSHAPE_README, Postfix queue analysis
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* 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
/*--*/
/* System library. */
#include <sys_defs.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
/* Utility library. */
#include <msg.h>
#include <events.h>
#include <vstream.h>
#include <dict.h>
/* Global library. */
#include <mail_queue.h>
#include <recipient_list.h>
#include <mail_conf.h>
#include <mail_params.h>
#include <mail_version.h>
#include <mail_proto.h> /* QMGR_SCAN constants */
#include <mail_flow.h>
#include <flush_clnt.h>
/* Master process interface */
#include <master_proto.h>
#include <mail_server.h>
/* Application-specific. */
#include "qmgr.h"
/*
* Tunables.
*/
int var_queue_run_delay;
int var_min_backoff_time;
int var_max_backoff_time;
int var_max_queue_time;
int var_dsn_queue_time;
int var_qmgr_active_limit;
int var_qmgr_rcpt_limit;
int var_init_dest_concurrency;
int var_transport_retry_time;
int var_dest_con_limit;
int var_dest_rcpt_limit;
char *var_defer_xports;
int var_qmgr_fudge;
int var_local_rcpt_lim; /* XXX */
int var_local_con_lim; /* XXX */
bool var_verp_bounce_off;
int var_qmgr_clog_warn_time;
char *var_conc_pos_feedback;
char *var_conc_neg_feedback;
int var_conc_cohort_limit;
int var_conc_feedback_debug;
int var_xport_rate_delay;
int var_dest_rate_delay;
char *var_def_filter_nexthop;
int var_qmgr_daemon_timeout;
int var_qmgr_ipc_timeout;
int var_dsn_delay_cleared;
int var_vrfy_pend_limit;
static QMGR_SCAN *qmgr_scans[2];
#define QMGR_SCAN_IDX_INCOMING 0
#define QMGR_SCAN_IDX_DEFERRED 1
#define QMGR_SCAN_IDX_COUNT (sizeof(qmgr_scans) / sizeof(qmgr_scans[0]))
/* qmgr_deferred_run_event - queue manager heartbeat */
static void qmgr_deferred_run_event(int unused_event, void *dummy)
{
/*
* This routine runs when it is time for another deferred queue scan.
* Make sure this routine gets called again in the future.
*/
qmgr_scan_request(qmgr_scans[QMGR_SCAN_IDX_DEFERRED], QMGR_SCAN_START);
event_request_timer(qmgr_deferred_run_event, dummy, var_queue_run_delay);
}
/* qmgr_trigger_event - respond to external trigger(s) */
static void qmgr_trigger_event(char *buf, ssize_t len,
char *unused_service, char **argv)
{
int incoming_flag = 0;
int deferred_flag = 0;
int i;
/*
* Sanity check. This service takes no command-line arguments.
*/
if (argv[0])
msg_fatal("unexpected command-line argument: %s", argv[0]);
/*
* Collapse identical requests that have arrived since we looked last
* time. There is no client feedback so there is no need to process each
* request in order. And as long as we don't have conflicting requests we
* are free to sort them into the most suitable order.
*/
#define QMGR_FLUSH_BEFORE (QMGR_FLUSH_ONCE | QMGR_FLUSH_DFXP)
for (i = 0; i < len; i++) {
if (msg_verbose)
msg_info("request: %d (%c)",
buf[i], ISALNUM(buf[i]) ? buf[i] : '?');
switch (buf[i]) {
case TRIGGER_REQ_WAKEUP:
case QMGR_REQ_SCAN_INCOMING:
incoming_flag |= QMGR_SCAN_START;
break;
case QMGR_REQ_SCAN_DEFERRED:
deferred_flag |= QMGR_SCAN_START;
break;
case QMGR_REQ_FLUSH_DEAD:
deferred_flag |= QMGR_FLUSH_BEFORE;
incoming_flag |= QMGR_FLUSH_BEFORE;
break;
case QMGR_REQ_SCAN_ALL:
deferred_flag |= QMGR_SCAN_ALL;
incoming_flag |= QMGR_SCAN_ALL;
break;
default:
if (msg_verbose)
msg_info("request ignored");
break;
}
}
/*
* Process each request type at most once. Modifiers take effect upon the
* next queue run. If no queue run is in progress, and a queue scan is
* requested, the request takes effect immediately.
*/
if (incoming_flag != 0)
qmgr_scan_request(qmgr_scans[QMGR_SCAN_IDX_INCOMING], incoming_flag);
if (deferred_flag != 0)
qmgr_scan_request(qmgr_scans[QMGR_SCAN_IDX_DEFERRED], deferred_flag);
}
/* qmgr_loop - queue manager main loop */
static int qmgr_loop(char *unused_name, char **unused_argv)
{
char *path;
ssize_t token_count;
int feed = 0;
int scan_idx; /* Priority order scan index */
static int first_scan_idx = QMGR_SCAN_IDX_INCOMING;
int last_scan_idx = QMGR_SCAN_IDX_COUNT - 1;
int delay;
/*
* This routine runs as part of the event handling loop, after the event
* manager has delivered a timer or I/O event (including the completion
* of a connection to a delivery process), or after it has waited for a
* specified amount of time. The result value of qmgr_loop() specifies
* how long the event manager should wait for the next event.
*/
#define DONT_WAIT 0
#define WAIT_FOR_EVENT (-1)
/*
* Attempt to drain the active queue by allocating a suitable delivery
* process and by delivering mail via it. Delivery process allocation and
* mail delivery are asynchronous.
*/
qmgr_active_drain();
/*
* Let some new blood into the active queue when the queue size is
* smaller than some configurable limit, and when the number of in-core
* recipients does not exceed some configurable limit.
*
* We import one message per interrupt, to optimally tune the input count
* for the number of delivery agent protocol wait states, as explained in
* qmgr_transport.c.
*/
delay = WAIT_FOR_EVENT;
for (scan_idx = 0; qmgr_message_count < var_qmgr_active_limit
&& qmgr_recipient_count < var_qmgr_rcpt_limit
&& scan_idx < QMGR_SCAN_IDX_COUNT; ++scan_idx) {
last_scan_idx = (scan_idx + first_scan_idx) % QMGR_SCAN_IDX_COUNT;
if ((path = qmgr_scan_next(qmgr_scans[last_scan_idx])) != 0) {
delay = DONT_WAIT;
if ((feed = qmgr_active_feed(qmgr_scans[last_scan_idx], path)) != 0)
break;
}
}
/*
* Round-robin the queue scans. When the active queue becomes full,
* prefer new mail over deferred mail.
*/
if (qmgr_message_count < var_qmgr_active_limit
&& qmgr_recipient_count < var_qmgr_rcpt_limit) {
first_scan_idx = (last_scan_idx + 1) % QMGR_SCAN_IDX_COUNT;
} else if (first_scan_idx != QMGR_SCAN_IDX_INCOMING) {
first_scan_idx = QMGR_SCAN_IDX_INCOMING;
}
/*
* Global flow control. If enabled, slow down receiving processes that
* get ahead of the queue manager, but don't block them completely.
*/
if (var_in_flow_delay > 0) {
token_count = mail_flow_count();
if (token_count < var_proc_limit) {
if (feed != 0 && last_scan_idx == QMGR_SCAN_IDX_INCOMING)
mail_flow_put(1);
else if (qmgr_scans[QMGR_SCAN_IDX_INCOMING]->handle == 0)
mail_flow_put(var_proc_limit - token_count);
} else if (token_count > var_proc_limit) {
mail_flow_get(token_count - var_proc_limit);
}
}
return (delay);
}
/* pre_accept - see if tables have changed */
static void pre_accept(char *unused_name, char **unused_argv)
{
const char *table;
if ((table = dict_changed_name()) != 0) {
msg_info("table %s has changed -- restarting", table);
exit(0);
}
}
/* qmgr_pre_init - pre-jail initialization */
static void qmgr_pre_init(char *unused_name, char **unused_argv)
{
flush_init();
}
/* qmgr_post_init - post-jail initialization */
static void qmgr_post_init(char *unused_name, char **unused_argv)
{
/*
* Sanity check.
*/
if (var_qmgr_rcpt_limit < var_qmgr_active_limit) {
msg_warn("%s is smaller than %s - adjusting %s",
VAR_QMGR_RCPT_LIMIT, VAR_QMGR_ACT_LIMIT, VAR_QMGR_RCPT_LIMIT);
var_qmgr_rcpt_limit = var_qmgr_active_limit;
}
if (var_dsn_queue_time > var_max_queue_time) {
msg_warn("%s is larger than %s - adjusting %s",
VAR_DSN_QUEUE_TIME, VAR_MAX_QUEUE_TIME, VAR_DSN_QUEUE_TIME);
var_dsn_queue_time = var_max_queue_time;
}
/*
* This routine runs after the skeleton code has entered the chroot jail.
* Prevent automatic process suicide after a limited number of client
* requests or after a limited amount of idle time. Move any left-over
* entries from the active queue to the incoming queue, and give them a
* time stamp into the future, in order to allow ongoing deliveries to
* finish first. Start scanning the incoming and deferred queues.
* Left-over active queue entries are moved to the incoming queue because
* the incoming queue has priority; moving left-overs to the deferred
* queue could cause anomalous delays when "postfix reload/start" are
* issued often. Override the IPC timeout (default 3600s) so that the
* queue manager can reset a broken IPC channel before the watchdog timer
* goes off.
*/
var_ipc_timeout = var_qmgr_ipc_timeout;
var_use_limit = 0;
var_idle_limit = 0;
qmgr_move(MAIL_QUEUE_ACTIVE, MAIL_QUEUE_INCOMING, event_time());
qmgr_scans[QMGR_SCAN_IDX_INCOMING] = qmgr_scan_create(MAIL_QUEUE_INCOMING);
qmgr_scans[QMGR_SCAN_IDX_DEFERRED] = qmgr_scan_create(MAIL_QUEUE_DEFERRED);
qmgr_scan_request(qmgr_scans[QMGR_SCAN_IDX_INCOMING], QMGR_SCAN_START);
qmgr_deferred_run_event(0, (void *) 0);
}
MAIL_VERSION_STAMP_DECLARE;
/* main - the main program */
int main(int argc, char **argv)
{
static const CONFIG_STR_TABLE str_table[] = {
VAR_DEFER_XPORTS, DEF_DEFER_XPORTS, &var_defer_xports, 0, 0,
VAR_CONC_POS_FDBACK, DEF_CONC_POS_FDBACK, &var_conc_pos_feedback, 1, 0,
VAR_CONC_NEG_FDBACK, DEF_CONC_NEG_FDBACK, &var_conc_neg_feedback, 1, 0,
VAR_DEF_FILTER_NEXTHOP, DEF_DEF_FILTER_NEXTHOP, &var_def_filter_nexthop, 0, 0,
0,
};
static const CONFIG_TIME_TABLE time_table[] = {
VAR_QUEUE_RUN_DELAY, DEF_QUEUE_RUN_DELAY, &var_queue_run_delay, 1, 0,
VAR_MIN_BACKOFF_TIME, DEF_MIN_BACKOFF_TIME, &var_min_backoff_time, 1, 0,
VAR_MAX_BACKOFF_TIME, DEF_MAX_BACKOFF_TIME, &var_max_backoff_time, 1, 0,
VAR_MAX_QUEUE_TIME, DEF_MAX_QUEUE_TIME, &var_max_queue_time, 0, 8640000,
VAR_DSN_QUEUE_TIME, DEF_DSN_QUEUE_TIME, &var_dsn_queue_time, 0, 8640000,
VAR_XPORT_RETRY_TIME, DEF_XPORT_RETRY_TIME, &var_transport_retry_time, 1, 0,
VAR_QMGR_CLOG_WARN_TIME, DEF_QMGR_CLOG_WARN_TIME, &var_qmgr_clog_warn_time, 0, 0,
VAR_XPORT_RATE_DELAY, DEF_XPORT_RATE_DELAY, &var_xport_rate_delay, 0, 0,
VAR_DEST_RATE_DELAY, DEF_DEST_RATE_DELAY, &var_dest_rate_delay, 0, 0,
VAR_QMGR_DAEMON_TIMEOUT, DEF_QMGR_DAEMON_TIMEOUT, &var_qmgr_daemon_timeout, 1, 0,
VAR_QMGR_IPC_TIMEOUT, DEF_QMGR_IPC_TIMEOUT, &var_qmgr_ipc_timeout, 1, 0,
0,
};
static const CONFIG_INT_TABLE int_table[] = {
VAR_QMGR_ACT_LIMIT, DEF_QMGR_ACT_LIMIT, &var_qmgr_active_limit, 1, 0,
VAR_QMGR_RCPT_LIMIT, DEF_QMGR_RCPT_LIMIT, &var_qmgr_rcpt_limit, 1, 0,
VAR_INIT_DEST_CON, DEF_INIT_DEST_CON, &var_init_dest_concurrency, 1, 0,
VAR_DEST_CON_LIMIT, DEF_DEST_CON_LIMIT, &var_dest_con_limit, 0, 0,
VAR_DEST_RCPT_LIMIT, DEF_DEST_RCPT_LIMIT, &var_dest_rcpt_limit, 0, 0,
VAR_QMGR_FUDGE, DEF_QMGR_FUDGE, &var_qmgr_fudge, 10, 100,
VAR_LOCAL_RCPT_LIMIT, DEF_LOCAL_RCPT_LIMIT, &var_local_rcpt_lim, 0, 0,
VAR_LOCAL_CON_LIMIT, DEF_LOCAL_CON_LIMIT, &var_local_con_lim, 0, 0,
VAR_CONC_COHORT_LIM, DEF_CONC_COHORT_LIM, &var_conc_cohort_limit, 0, 0,
VAR_VRFY_PEND_LIMIT, DEF_VRFY_PEND_LIMIT, &var_vrfy_pend_limit, 1, 0,
0,
};
static const CONFIG_BOOL_TABLE bool_table[] = {
VAR_VERP_BOUNCE_OFF, DEF_VERP_BOUNCE_OFF, &var_verp_bounce_off,
VAR_CONC_FDBACK_DEBUG, DEF_CONC_FDBACK_DEBUG, &var_conc_feedback_debug,
VAR_DSN_DELAY_CLEARED, DEF_DSN_DELAY_CLEARED, &var_dsn_delay_cleared,
0,
};
/*
* Fingerprint executables and core dumps.
*/
MAIL_VERSION_STAMP_ALLOCATE;
/*
* Use the trigger service skeleton, because no-one else should be
* monitoring our service port while this process runs, and because we do
* not talk back to the client.
*/
trigger_server_main(argc, argv, qmgr_trigger_event,
CA_MAIL_SERVER_INT_TABLE(int_table),
CA_MAIL_SERVER_STR_TABLE(str_table),
CA_MAIL_SERVER_BOOL_TABLE(bool_table),
CA_MAIL_SERVER_TIME_TABLE(time_table),
CA_MAIL_SERVER_PRE_INIT(qmgr_pre_init),
CA_MAIL_SERVER_POST_INIT(qmgr_post_init),
CA_MAIL_SERVER_LOOP(qmgr_loop),
CA_MAIL_SERVER_PRE_ACCEPT(pre_accept),
CA_MAIL_SERVER_SOLITARY,
CA_MAIL_SERVER_WATCHDOG(&var_qmgr_daemon_timeout),
0);
}