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+/*++
+/* NAME
+/* qmgr 8
+/* SUMMARY
+/* 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) daemon 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.
+/* .IP "\fBpreemptive message scheduling\fR"
+/* The queue manager attempts to minimize the average per-recipient delay
+/* while still preserving the correct per-message delays, using
+/* a sophisticated preemptive message scheduling.
+/* 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 \fBsyslogd\fR(8)
+/* or \fBpostlogd\fR(8).
+/* 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 "\fBpostfix reload\fR" command 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 $default_filter_nexthop instead; when
+/* that value is empty, use the domain in the recipient address.
+/* ACTIVE QUEUE CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBqmgr_clog_warn_time (300s)\fR"
+/* The minimal delay between warnings that a specific destination is
+/* clogging up the Postfix active queue.
+/* .IP "\fBqmgr_message_active_limit (20000)\fR"
+/* The maximal number of messages in the active queue.
+/* .IP "\fBqmgr_message_recipient_limit (20000)\fR"
+/* The maximal number of recipients held in memory by the Postfix
+/* queue manager, and the maximal size of the short-term,
+/* in-memory "dead" destination status cache.
+/* .IP "\fBqmgr_message_recipient_minimum (10)\fR"
+/* The minimal number of in-memory recipients for any message.
+/* .IP "\fBdefault_recipient_limit (20000)\fR"
+/* The default per-transport upper limit on the number of in-memory
+/* recipients.
+/* .IP "\fBtransport_recipient_limit ($default_recipient_limit)\fR"
+/* A transport-specific override for the default_recipient_limit
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* .IP "\fBdefault_extra_recipient_limit (1000)\fR"
+/* The default value for the extra per-transport limit imposed on the
+/* number of in-memory recipients.
+/* .IP "\fBtransport_extra_recipient_limit ($default_extra_recipient_limit)\fR"
+/* A transport-specific override for the default_extra_recipient_limit
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* .PP
+/* Available in Postfix version 2.4 and later:
+/* .IP "\fBdefault_recipient_refill_limit (100)\fR"
+/* The default per-transport limit on the number of recipients refilled at
+/* once.
+/* .IP "\fBtransport_recipient_refill_limit ($default_recipient_refill_limit)\fR"
+/* A transport-specific override for the default_recipient_refill_limit
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* .IP "\fBdefault_recipient_refill_delay (5s)\fR"
+/* The default per-transport maximum delay between recipients refills.
+/* .IP "\fBtransport_recipient_refill_delay ($default_recipient_refill_delay)\fR"
+/* A transport-specific override for the default_recipient_refill_delay
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* DELIVERY CONCURRENCY CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBinitial_destination_concurrency (5)\fR"
+/* The initial per-destination concurrency level for parallel delivery
+/* to the same destination.
+/* .IP "\fBdefault_destination_concurrency_limit (20)\fR"
+/* The default maximal number of parallel deliveries to the same
+/* destination.
+/* .IP "\fBtransport_destination_concurrency_limit ($default_destination_concurrency_limit)\fR"
+/* A transport-specific override for the
+/* default_destination_concurrency_limit parameter value, where
+/* \fItransport\fR is the master.cf name of the message delivery
+/* transport.
+/* .PP
+/* Available in Postfix version 2.5 and later:
+/* .IP "\fBtransport_initial_destination_concurrency ($initial_destination_concurrency)\fR"
+/* A transport-specific override for the initial_destination_concurrency
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* .IP "\fBdefault_destination_concurrency_failed_cohort_limit (1)\fR"
+/* How many pseudo-cohorts must suffer connection or handshake
+/* failure before a specific destination is considered unavailable
+/* (and further delivery is suspended).
+/* .IP "\fBtransport_destination_concurrency_failed_cohort_limit ($default_destination_concurrency_failed_cohort_limit)\fR"
+/* A transport-specific override for the
+/* default_destination_concurrency_failed_cohort_limit parameter value,
+/* where \fItransport\fR is the master.cf name of the message delivery
+/* transport.
+/* .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 "\fBtransport_destination_concurrency_negative_feedback ($default_destination_concurrency_negative_feedback)\fR"
+/* A transport-specific override for the
+/* default_destination_concurrency_negative_feedback parameter value,
+/* where \fItransport\fR is the master.cf name of the message delivery
+/* transport.
+/* .IP "\fBdefault_destination_concurrency_positive_feedback (1)\fR"
+/* The per-destination amount of delivery concurrency positive
+/* feedback, after a delivery completes without connection or handshake
+/* failure.
+/* .IP "\fBtransport_destination_concurrency_positive_feedback ($default_destination_concurrency_positive_feedback)\fR"
+/* A transport-specific override for the
+/* default_destination_concurrency_positive_feedback parameter value,
+/* where \fItransport\fR is the master.cf name of the message delivery
+/* transport.
+/* .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 "\fBtransport_destination_recipient_limit ($default_destination_recipient_limit)\fR"
+/* A transport-specific override for the
+/* default_destination_recipient_limit parameter value, where
+/* \fItransport\fR is the master.cf name of the message delivery
+/* transport.
+/* MESSAGE SCHEDULING CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBdefault_delivery_slot_cost (5)\fR"
+/* How often the Postfix queue manager's scheduler is allowed to
+/* preempt delivery of one message with another.
+/* .IP "\fBtransport_delivery_slot_cost ($default_delivery_slot_cost)\fR"
+/* A transport-specific override for the default_delivery_slot_cost
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* .IP "\fBdefault_minimum_delivery_slots (3)\fR"
+/* How many recipients a message must have in order to invoke the
+/* Postfix queue manager's scheduling algorithm at all.
+/* .IP "\fBtransport_minimum_delivery_slots ($default_minimum_delivery_slots)\fR"
+/* A transport-specific override for the default_minimum_delivery_slots
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* .IP "\fBdefault_delivery_slot_discount (50)\fR"
+/* The default value for transport-specific _delivery_slot_discount
+/* settings.
+/* .IP "\fBtransport_delivery_slot_discount ($default_delivery_slot_discount)\fR"
+/* A transport-specific override for the default_delivery_slot_discount
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* .IP "\fBdefault_delivery_slot_loan (3)\fR"
+/* The default value for transport-specific _delivery_slot_loan
+/* settings.
+/* .IP "\fBtransport_delivery_slot_loan ($default_delivery_slot_loan)\fR"
+/* A transport-specific override for the default_delivery_slot_loan
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* OTHER RESOURCE AND RATE CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBminimal_backoff_time (300s)\fR"
+/* The minimal time between attempts to deliver a deferred message;
+/* prior to Postfix 2.4 the default value was 1000s.
+/* .IP "\fBmaximal_backoff_time (4000s)\fR"
+/* The maximal time between attempts to deliver a deferred message.
+/* .IP "\fBmaximal_queue_lifetime (5d)\fR"
+/* Consider a message as undeliverable, when delivery fails with a
+/* temporary error, and the time in the queue has reached the
+/* maximal_queue_lifetime limit.
+/* .IP "\fBqueue_run_delay (300s)\fR"
+/* The time between deferred queue scans by the queue manager;
+/* prior to Postfix 2.4 the default value was 1000s.
+/* .IP "\fBtransport_retry_time (60s)\fR"
+/* The time between attempts by the Postfix queue manager to contact
+/* a malfunctioning message delivery transport.
+/* .PP
+/* Available in Postfix version 2.1 and later:
+/* .IP "\fBbounce_queue_lifetime (5d)\fR"
+/* Consider a bounce message as undeliverable, when delivery fails
+/* with a temporary error, and the time in the queue has reached the
+/* bounce_queue_lifetime limit.
+/* .PP
+/* Available in Postfix version 2.5 and later:
+/* .IP "\fBdefault_destination_rate_delay (0s)\fR"
+/* The default amount of delay that is inserted between individual
+/* message deliveries to the same destination and over the same message
+/* delivery transport.
+/* .IP "\fBtransport_destination_rate_delay ($default_destination_rate_delay)\fR"
+/* A transport-specific override for the default_destination_rate_delay
+/* parameter value, where \fItransport\fR is the master.cf name of
+/* the message delivery transport.
+/* .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
+/* message deliveries over the same message delivery transport,
+/* regardless of destination.
+/* .IP "\fBtransport_transport_rate_delay ($default_transport_rate_delay)\fR"
+/* A transport-specific override for the default_transport_rate_delay
+/* parameter value, where the initial \fItransport\fR in the parameter
+/* name is the master.cf name of the message delivery transport.
+/* 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"
+/* A prefix that is prepended to the process name in syslog
+/* records, so that, for example, "smtpd" becomes "prefix/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.
+/* .PP
+/* Available in Postfix 3.3 and later:
+/* .IP "\fBservice_name (read-only)\fR"
+/* The master.cf service name of a Postfix daemon process.
+/* .PP
+/* Available in Postfix 3.5 and later:
+/* .IP "\fBinfo_log_address_format (external)\fR"
+/* The email address form that will be used in non-debug logging
+/* (info, warning, etc.).
+/* 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
+/* postlogd(8), Postfix logging
+/* syslogd(8), system logging
+/* README FILES
+/* .ad
+/* .fi
+/* Use "\fBpostconf readme_directory\fR" or
+/* "\fBpostconf html_directory\fR" to locate this information.
+/* .na
+/* .nf
+/* SCHEDULER_README, scheduling algorithm
+/* 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
+/*
+/* Preemptive scheduler enhancements:
+/* Patrik Rak
+/* Modra 6
+/* 155 00, Prague, Czech Republic
+/*
+/* 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_qmgr_msg_rcpt_limit;
+int var_xport_rcpt_limit;
+int var_stack_rcpt_limit;
+int var_xport_refill_limit;
+int var_xport_refill_delay;
+int var_delivery_slot_cost;
+int var_delivery_slot_loan;
+int var_delivery_slot_discount;
+int var_min_delivery_slots;
+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_local_con_lim;
+int var_local_rcpt_lim;
+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.
+ *
+ * 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
+ && 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) {
+ 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 *name, char **unused_argv)
+{
+
+ /*
+ * Backwards compatibility.
+ */
+ if (strcmp(var_procname, "nqmgr") == 0) {
+ msg_warn("please update the %s/%s file; the new queue manager",
+ var_config_dir, MASTER_CONF_FILE);
+ msg_warn("(old name: nqmgr) has become the standard queue manager (new name: qmgr)");
+ msg_warn("support for the name old name (nqmgr) will be removed from Postfix");
+ }
+
+ /*
+ * 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_REFILL_DELAY, DEF_XPORT_REFILL_DELAY, &var_xport_refill_delay, 1, 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_QMGR_MSG_RCPT_LIMIT, DEF_QMGR_MSG_RCPT_LIMIT, &var_qmgr_msg_rcpt_limit, 1, 0,
+ VAR_XPORT_RCPT_LIMIT, DEF_XPORT_RCPT_LIMIT, &var_xport_rcpt_limit, 0, 0,
+ VAR_STACK_RCPT_LIMIT, DEF_STACK_RCPT_LIMIT, &var_stack_rcpt_limit, 0, 0,
+ VAR_XPORT_REFILL_LIMIT, DEF_XPORT_REFILL_LIMIT, &var_xport_refill_limit, 1, 0,
+ VAR_DELIVERY_SLOT_COST, DEF_DELIVERY_SLOT_COST, &var_delivery_slot_cost, 0, 0,
+ VAR_DELIVERY_SLOT_LOAN, DEF_DELIVERY_SLOT_LOAN, &var_delivery_slot_loan, 0, 0,
+ VAR_DELIVERY_SLOT_DISCOUNT, DEF_DELIVERY_SLOT_DISCOUNT, &var_delivery_slot_discount, 0, 100,
+ VAR_MIN_DELIVERY_SLOTS, DEF_MIN_DELIVERY_SLOTS, &var_min_delivery_slots, 0, 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_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);
+}