/*++ /* 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 the syslog 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 "\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 $default_filter_nexthop instead; when /* that value is empty, use the domain in the recipient address. /* ACTIVE QUEUE CONTROLS /* .ad /* .fi /* .IP "\fBqmgr_clog_warn_time (300s)\fR" /* The minimal delay between warnings that a specific destination is /* clogging up the Postfix active queue. /* .IP "\fBqmgr_message_active_limit (20000)\fR" /* The maximal number of messages in the active queue. /* .IP "\fBqmgr_message_recipient_limit (20000)\fR" /* The maximal number of recipients held in memory by the Postfix /* queue manager, and the maximal size of the size of the short-term, /* in-memory "dead" destination status cache. /* .IP "\fBqmgr_message_recipient_minimum (10)\fR" /* The minimal number of in-memory recipients for any message. /* .IP "\fBdefault_recipient_limit (20000)\fR" /* The default per-transport upper limit on the number of in-memory /* recipients. /* .IP "\fItransport\fB_recipient_limit ($default_recipient_limit)\fR" /* Idem, for delivery via the named message \fItransport\fR. /* .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 "\fItransport\fB_extra_recipient_limit ($default_extra_recipient_limit)\fR" /* Idem, for delivery via the named message \fItransport\fR. /* .PP /* Available in Postfix version 2.4 and later: /* .IP "\fBdefault_recipient_refill_limit (100)\fR" /* The default per-transport limit on the number of recipients refilled at /* once. /* .IP "\fItransport\fB_recipient_refill_limit ($default_recipient_refill_limit)\fR" /* Idem, for delivery via the named message \fItransport\fR. /* .IP "\fBdefault_recipient_refill_delay (5s)\fR" /* The default per-transport maximum delay between recipients refills. /* .IP "\fItransport\fB_recipient_refill_delay ($default_recipient_refill_delay)\fR" /* Idem, for delivery via the named message \fItransport\fR. /* DELIVERY CONCURRENCY CONTROLS /* .ad /* .fi /* .IP "\fBinitial_destination_concurrency (5)\fR" /* The initial per-destination concurrency level for parallel delivery /* to the same destination. /* .IP "\fBdefault_destination_concurrency_limit (20)\fR" /* The default maximal number of parallel deliveries to the same /* destination. /* .IP "\fItransport\fB_destination_concurrency_limit ($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 ($default_destination_recipient_limit)\fR" /* Idem, for delivery via the named message \fItransport\fR. /* MESSAGE SCHEDULING CONTROLS /* .ad /* .fi /* .IP "\fBdefault_delivery_slot_cost (5)\fR" /* How often the Postfix queue manager's scheduler is allowed to /* preempt delivery of one message with another. /* .IP "\fItransport\fB_delivery_slot_cost ($default_delivery_slot_cost)\fR" /* Idem, for delivery via the named message \fItransport\fR. /* .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 "\fItransport\fB_minimum_delivery_slots ($default_minimum_delivery_slots)\fR" /* Idem, for delivery via the named message \fItransport\fR. /* .IP "\fBdefault_delivery_slot_discount (50)\fR" /* The default value for transport-specific _delivery_slot_discount /* settings. /* .IP "\fItransport\fB_delivery_slot_discount ($default_delivery_slot_discount)\fR" /* Idem, for delivery via the named message \fItransport\fR. /* .IP "\fBdefault_delivery_slot_loan (3)\fR" /* The default value for transport-specific _delivery_slot_loan /* settings. /* .IP "\fItransport\fB_delivery_slot_loan ($default_delivery_slot_loan)\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" /* The maximal time a message is queued before it is sent back as /* undeliverable. /* .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" /* The maximal time a bounce message is queued before it is considered /* undeliverable. /* .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; with per-destination recipient /* limit > 1, a destination is a domain, otherwise it is a recipient. /* .IP "\fItransport\fB_destination_rate_delay $default_destination_rate_delay /* 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. /* 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". /* 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 /* 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 /*--*/ /* 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; int var_proc_limit; 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_dest_rate_delay; char *var_def_filter_nexthop; int var_qmgr_daemon_timeout; int var_qmgr_ipc_timeout; 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, char *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, int 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; int 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, (char *) 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_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_PROC_LIMIT, DEF_PROC_LIMIT, &var_proc_limit, 1, 0, VAR_CONC_COHORT_LIM, DEF_CONC_COHORT_LIM, &var_conc_cohort_limit, 0, 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, 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, MAIL_SERVER_INT_TABLE, int_table, MAIL_SERVER_STR_TABLE, str_table, MAIL_SERVER_BOOL_TABLE, bool_table, MAIL_SERVER_TIME_TABLE, time_table, MAIL_SERVER_PRE_INIT, qmgr_pre_init, MAIL_SERVER_POST_INIT, qmgr_post_init, MAIL_SERVER_LOOP, qmgr_loop, MAIL_SERVER_PRE_ACCEPT, pre_accept, MAIL_SERVER_SOLITARY, MAIL_SERVER_WATCHDOG, &var_qmgr_daemon_timeout, 0); }