1/* $NetBSD$ */ 2 3/*++ 4/* NAME 5/* qmgr 8 6/* SUMMARY 7/* Postfix queue manager 8/* SYNOPSIS 9/* \fBqmgr\fR [generic Postfix daemon options] 10/* DESCRIPTION 11/* The \fBqmgr\fR(8) daemon awaits the arrival of incoming mail 12/* and arranges for its delivery via Postfix delivery processes. 13/* The actual mail routing strategy is delegated to the 14/* \fBtrivial-rewrite\fR(8) daemon. 15/* This program expects to be run from the \fBmaster\fR(8) process 16/* manager. 17/* 18/* Mail addressed to the local \fBdouble-bounce\fR address is 19/* logged and discarded. This stops potential loops caused by 20/* undeliverable bounce notifications. 21/* MAIL QUEUES 22/* .ad 23/* .fi 24/* The \fBqmgr\fR(8) daemon maintains the following queues: 25/* .IP \fBincoming\fR 26/* Inbound mail from the network, or mail picked up by the 27/* local \fBpickup\fR(8) daemon from the \fBmaildrop\fR directory. 28/* .IP \fBactive\fR 29/* Messages that the queue manager has opened for delivery. Only 30/* a limited number of messages is allowed to enter the \fBactive\fR 31/* queue (leaky bucket strategy, for a fixed delivery rate). 32/* .IP \fBdeferred\fR 33/* Mail that could not be delivered upon the first attempt. The queue 34/* manager implements exponential backoff by doubling the time between 35/* delivery attempts. 36/* .IP \fBcorrupt\fR 37/* Unreadable or damaged queue files are moved here for inspection. 38/* .IP \fBhold\fR 39/* Messages that are kept "on hold" are kept here until someone 40/* sets them free. 41/* DELIVERY STATUS REPORTS 42/* .ad 43/* .fi 44/* The \fBqmgr\fR(8) daemon keeps an eye on per-message delivery status 45/* reports in the following directories. Each status report file has 46/* the same name as the corresponding message file: 47/* .IP \fBbounce\fR 48/* Per-recipient status information about why mail is bounced. 49/* These files are maintained by the \fBbounce\fR(8) daemon. 50/* .IP \fBdefer\fR 51/* Per-recipient status information about why mail is delayed. 52/* These files are maintained by the \fBdefer\fR(8) daemon. 53/* .IP \fBtrace\fR 54/* Per-recipient status information as requested with the 55/* Postfix "\fBsendmail -v\fR" or "\fBsendmail -bv\fR" command. 56/* These files are maintained by the \fBtrace\fR(8) daemon. 57/* .PP 58/* The \fBqmgr\fR(8) daemon is responsible for asking the 59/* \fBbounce\fR(8), \fBdefer\fR(8) or \fBtrace\fR(8) daemons to 60/* send delivery reports. 61/* STRATEGIES 62/* .ad 63/* .fi 64/* The queue manager implements a variety of strategies for 65/* either opening queue files (input) or for message delivery (output). 66/* .IP "\fBleaky bucket\fR" 67/* This strategy limits the number of messages in the \fBactive\fR queue 68/* and prevents the queue manager from running out of memory under 69/* heavy load. 70/* .IP \fBfairness\fR 71/* When the \fBactive\fR queue has room, the queue manager takes one 72/* message from the \fBincoming\fR queue and one from the \fBdeferred\fR 73/* queue. This prevents a large mail backlog from blocking the delivery 74/* of new mail. 75/* .IP "\fBslow start\fR" 76/* This strategy eliminates "thundering herd" problems by slowly 77/* adjusting the number of parallel deliveries to the same destination. 78/* .IP "\fBround robin\fR 79/* The queue manager sorts delivery requests by destination. 80/* Round-robin selection prevents one destination from dominating 81/* deliveries to other destinations. 82/* .IP "\fBexponential backoff\fR" 83/* Mail that cannot be delivered upon the first attempt is deferred. 84/* The time interval between delivery attempts is doubled after each 85/* attempt. 86/* .IP "\fBdestination status cache\fR" 87/* The queue manager avoids unnecessary delivery attempts by 88/* maintaining a short-term, in-memory list of unreachable destinations. 89/* .IP "\fBpreemptive message scheduling\fR" 90/* The queue manager attempts to minimize the average per-recipient delay 91/* while still preserving the correct per-message delays, using 92/* a sophisticated preemptive message scheduling. 93/* TRIGGERS 94/* .ad 95/* .fi 96/* On an idle system, the queue manager waits for the arrival of 97/* trigger events, or it waits for a timer to go off. A trigger 98/* is a one-byte message. 99/* Depending on the message received, the queue manager performs 100/* one of the following actions (the message is followed by the 101/* symbolic constant used internally by the software): 102/* .IP "\fBD (QMGR_REQ_SCAN_DEFERRED)\fR" 103/* Start a deferred queue scan. If a deferred queue scan is already 104/* in progress, that scan will be restarted as soon as it finishes. 105/* .IP "\fBI (QMGR_REQ_SCAN_INCOMING)\fR" 106/* Start an incoming queue scan. If an incoming queue scan is already 107/* in progress, that scan will be restarted as soon as it finishes. 108/* .IP "\fBA (QMGR_REQ_SCAN_ALL)\fR" 109/* Ignore deferred queue file time stamps. The request affects 110/* the next deferred queue scan. 111/* .IP "\fBF (QMGR_REQ_FLUSH_DEAD)\fR" 112/* Purge all information about dead transports and destinations. 113/* .IP "\fBW (TRIGGER_REQ_WAKEUP)\fR" 114/* Wakeup call, This is used by the master server to instantiate 115/* servers that should not go away forever. The action is to start 116/* an incoming queue scan. 117/* .PP 118/* The \fBqmgr\fR(8) daemon reads an entire buffer worth of triggers. 119/* Multiple identical trigger requests are collapsed into one, and 120/* trigger requests are sorted so that \fBA\fR and \fBF\fR precede 121/* \fBD\fR and \fBI\fR. Thus, in order to force a deferred queue run, 122/* one would request \fBA F D\fR; in order to notify the queue manager 123/* of the arrival of new mail one would request \fBI\fR. 124/* STANDARDS 125/* RFC 3463 (Enhanced status codes) 126/* RFC 3464 (Delivery status notifications) 127/* SECURITY 128/* .ad 129/* .fi 130/* The \fBqmgr\fR(8) daemon is not security sensitive. It reads 131/* single-character messages from untrusted local users, and thus may 132/* be susceptible to denial of service attacks. The \fBqmgr\fR(8) daemon 133/* does not talk to the outside world, and it can be run at fixed low 134/* privilege in a chrooted environment. 135/* DIAGNOSTICS 136/* Problems and transactions are logged to the syslog daemon. 137/* Corrupted message files are saved to the \fBcorrupt\fR queue 138/* for further inspection. 139/* 140/* Depending on the setting of the \fBnotify_classes\fR parameter, 141/* the postmaster is notified of bounces and of other trouble. 142/* BUGS 143/* A single queue manager process has to compete for disk access with 144/* multiple front-end processes such as \fBcleanup\fR(8). A sudden burst of 145/* inbound mail can negatively impact outbound delivery rates. 146/* CONFIGURATION PARAMETERS 147/* .ad 148/* .fi 149/* Changes to \fBmain.cf\fR are not picked up automatically 150/* as \fBqmgr\fR(8) 151/* is a persistent process. Use the "\fBpostfix reload\fR" command after 152/* a configuration change. 153/* 154/* The text below provides only a parameter summary. See 155/* \fBpostconf\fR(5) for more details including examples. 156/* 157/* In the text below, \fItransport\fR is the first field in a 158/* \fBmaster.cf\fR entry. 159/* COMPATIBILITY CONTROLS 160/* .ad 161/* .fi 162/* Available before Postfix version 2.5: 163/* .IP "\fBallow_min_user (no)\fR" 164/* Allow a sender or recipient address to have `-' as the first 165/* character. 166/* .PP 167/* Available with Postfix version 2.7 and later: 168/* .IP "\fBdefault_filter_nexthop (empty)\fR" 169/* When a content_filter or FILTER request specifies no explicit 170/* next-hop destination, use $default_filter_nexthop instead; when 171/* that value is empty, use the domain in the recipient address. 172/* ACTIVE QUEUE CONTROLS 173/* .ad 174/* .fi 175/* .IP "\fBqmgr_clog_warn_time (300s)\fR" 176/* The minimal delay between warnings that a specific destination is 177/* clogging up the Postfix active queue. 178/* .IP "\fBqmgr_message_active_limit (20000)\fR" 179/* The maximal number of messages in the active queue. 180/* .IP "\fBqmgr_message_recipient_limit (20000)\fR" 181/* The maximal number of recipients held in memory by the Postfix 182/* queue manager, and the maximal size of the size of the short-term, 183/* in-memory "dead" destination status cache. 184/* .IP "\fBqmgr_message_recipient_minimum (10)\fR" 185/* The minimal number of in-memory recipients for any message. 186/* .IP "\fBdefault_recipient_limit (20000)\fR" 187/* The default per-transport upper limit on the number of in-memory 188/* recipients. 189/* .IP "\fItransport\fB_recipient_limit ($default_recipient_limit)\fR" 190/* Idem, for delivery via the named message \fItransport\fR. 191/* .IP "\fBdefault_extra_recipient_limit (1000)\fR" 192/* The default value for the extra per-transport limit imposed on the 193/* number of in-memory recipients. 194/* .IP "\fItransport\fB_extra_recipient_limit ($default_extra_recipient_limit)\fR" 195/* Idem, for delivery via the named message \fItransport\fR. 196/* .PP 197/* Available in Postfix version 2.4 and later: 198/* .IP "\fBdefault_recipient_refill_limit (100)\fR" 199/* The default per-transport limit on the number of recipients refilled at 200/* once. 201/* .IP "\fItransport\fB_recipient_refill_limit ($default_recipient_refill_limit)\fR" 202/* Idem, for delivery via the named message \fItransport\fR. 203/* .IP "\fBdefault_recipient_refill_delay (5s)\fR" 204/* The default per-transport maximum delay between recipients refills. 205/* .IP "\fItransport\fB_recipient_refill_delay ($default_recipient_refill_delay)\fR" 206/* Idem, for delivery via the named message \fItransport\fR. 207/* DELIVERY CONCURRENCY CONTROLS 208/* .ad 209/* .fi 210/* .IP "\fBinitial_destination_concurrency (5)\fR" 211/* The initial per-destination concurrency level for parallel delivery 212/* to the same destination. 213/* .IP "\fBdefault_destination_concurrency_limit (20)\fR" 214/* The default maximal number of parallel deliveries to the same 215/* destination. 216/* .IP "\fItransport\fB_destination_concurrency_limit ($default_destination_concurrency_limit)\fR" 217/* Idem, for delivery via the named message \fItransport\fR. 218/* .PP 219/* Available in Postfix version 2.5 and later: 220/* .IP "\fItransport\fB_initial_destination_concurrency ($initial_destination_concurrency)\fR" 221/* Initial concurrency for delivery via the named message 222/* \fItransport\fR. 223/* .IP "\fBdefault_destination_concurrency_failed_cohort_limit (1)\fR" 224/* How many pseudo-cohorts must suffer connection or handshake 225/* failure before a specific destination is considered unavailable 226/* (and further delivery is suspended). 227/* .IP "\fItransport\fB_destination_concurrency_failed_cohort_limit ($default_destination_concurrency_failed_cohort_limit)\fR" 228/* Idem, for delivery via the named message \fItransport\fR. 229/* .IP "\fBdefault_destination_concurrency_negative_feedback (1)\fR" 230/* The per-destination amount of delivery concurrency negative 231/* feedback, after a delivery completes with a connection or handshake 232/* failure. 233/* .IP "\fItransport\fB_destination_concurrency_negative_feedback ($default_destination_concurrency_negative_feedback)\fR" 234/* Idem, for delivery via the named message \fItransport\fR. 235/* .IP "\fBdefault_destination_concurrency_positive_feedback (1)\fR" 236/* The per-destination amount of delivery concurrency positive 237/* feedback, after a delivery completes without connection or handshake 238/* failure. 239/* .IP "\fItransport\fB_destination_concurrency_positive_feedback ($default_destination_concurrency_positive_feedback)\fR" 240/* Idem, for delivery via the named message \fItransport\fR. 241/* .IP "\fBdestination_concurrency_feedback_debug (no)\fR" 242/* Make the queue manager's feedback algorithm verbose for performance 243/* analysis purposes. 244/* RECIPIENT SCHEDULING CONTROLS 245/* .ad 246/* .fi 247/* .IP "\fBdefault_destination_recipient_limit (50)\fR" 248/* The default maximal number of recipients per message delivery. 249/* .IP "\fItransport\fB_destination_recipient_limit ($default_destination_recipient_limit)\fR" 250/* Idem, for delivery via the named message \fItransport\fR. 251/* MESSAGE SCHEDULING CONTROLS 252/* .ad 253/* .fi 254/* .IP "\fBdefault_delivery_slot_cost (5)\fR" 255/* How often the Postfix queue manager's scheduler is allowed to 256/* preempt delivery of one message with another. 257/* .IP "\fItransport\fB_delivery_slot_cost ($default_delivery_slot_cost)\fR" 258/* Idem, for delivery via the named message \fItransport\fR. 259/* .IP "\fBdefault_minimum_delivery_slots (3)\fR" 260/* How many recipients a message must have in order to invoke the 261/* Postfix queue manager's scheduling algorithm at all. 262/* .IP "\fItransport\fB_minimum_delivery_slots ($default_minimum_delivery_slots)\fR" 263/* Idem, for delivery via the named message \fItransport\fR. 264/* .IP "\fBdefault_delivery_slot_discount (50)\fR" 265/* The default value for transport-specific _delivery_slot_discount 266/* settings. 267/* .IP "\fItransport\fB_delivery_slot_discount ($default_delivery_slot_discount)\fR" 268/* Idem, for delivery via the named message \fItransport\fR. 269/* .IP "\fBdefault_delivery_slot_loan (3)\fR" 270/* The default value for transport-specific _delivery_slot_loan 271/* settings. 272/* .IP "\fItransport\fB_delivery_slot_loan ($default_delivery_slot_loan)\fR" 273/* Idem, for delivery via the named message \fItransport\fR. 274/* OTHER RESOURCE AND RATE CONTROLS 275/* .ad 276/* .fi 277/* .IP "\fBminimal_backoff_time (300s)\fR" 278/* The minimal time between attempts to deliver a deferred message; 279/* prior to Postfix 2.4 the default value was 1000s. 280/* .IP "\fBmaximal_backoff_time (4000s)\fR" 281/* The maximal time between attempts to deliver a deferred message. 282/* .IP "\fBmaximal_queue_lifetime (5d)\fR" 283/* The maximal time a message is queued before it is sent back as 284/* undeliverable. 285/* .IP "\fBqueue_run_delay (300s)\fR" 286/* The time between deferred queue scans by the queue manager; 287/* prior to Postfix 2.4 the default value was 1000s. 288/* .IP "\fBtransport_retry_time (60s)\fR" 289/* The time between attempts by the Postfix queue manager to contact 290/* a malfunctioning message delivery transport. 291/* .PP 292/* Available in Postfix version 2.1 and later: 293/* .IP "\fBbounce_queue_lifetime (5d)\fR" 294/* The maximal time a bounce message is queued before it is considered 295/* undeliverable. 296/* .PP 297/* Available in Postfix version 2.5 and later: 298/* .IP "\fBdefault_destination_rate_delay (0s)\fR" 299/* The default amount of delay that is inserted between individual 300/* deliveries to the same destination; with per-destination recipient 301/* limit > 1, a destination is a domain, otherwise it is a recipient. 302/* .IP "\fItransport\fB_destination_rate_delay $default_destination_rate_delay 303/* Idem, for delivery via the named message \fItransport\fR. 304/* SAFETY CONTROLS 305/* .ad 306/* .fi 307/* .IP "\fBqmgr_daemon_timeout (1000s)\fR" 308/* How much time a Postfix queue manager process may take to handle 309/* a request before it is terminated by a built-in watchdog timer. 310/* .IP "\fBqmgr_ipc_timeout (60s)\fR" 311/* The time limit for the queue manager to send or receive information 312/* over an internal communication channel. 313/* MISCELLANEOUS CONTROLS 314/* .ad 315/* .fi 316/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR" 317/* The default location of the Postfix main.cf and master.cf 318/* configuration files. 319/* .IP "\fBdefer_transports (empty)\fR" 320/* The names of message delivery transports that should not deliver mail 321/* unless someone issues "\fBsendmail -q\fR" or equivalent. 322/* .IP "\fBdelay_logging_resolution_limit (2)\fR" 323/* The maximal number of digits after the decimal point when logging 324/* sub-second delay values. 325/* .IP "\fBhelpful_warnings (yes)\fR" 326/* Log warnings about problematic configuration settings, and provide 327/* helpful suggestions. 328/* .IP "\fBprocess_id (read-only)\fR" 329/* The process ID of a Postfix command or daemon process. 330/* .IP "\fBprocess_name (read-only)\fR" 331/* The process name of a Postfix command or daemon process. 332/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR" 333/* The location of the Postfix top-level queue directory. 334/* .IP "\fBsyslog_facility (mail)\fR" 335/* The syslog facility of Postfix logging. 336/* .IP "\fBsyslog_name (see 'postconf -d' output)\fR" 337/* The mail system name that is prepended to the process name in syslog 338/* records, so that "smtpd" becomes, for example, "postfix/smtpd". 339/* FILES 340/* /var/spool/postfix/incoming, incoming queue 341/* /var/spool/postfix/active, active queue 342/* /var/spool/postfix/deferred, deferred queue 343/* /var/spool/postfix/bounce, non-delivery status 344/* /var/spool/postfix/defer, non-delivery status 345/* /var/spool/postfix/trace, delivery status 346/* SEE ALSO 347/* trivial-rewrite(8), address routing 348/* bounce(8), delivery status reports 349/* postconf(5), configuration parameters 350/* master(5), generic daemon options 351/* master(8), process manager 352/* syslogd(8), system logging 353/* README FILES 354/* .ad 355/* .fi 356/* Use "\fBpostconf readme_directory\fR" or 357/* "\fBpostconf html_directory\fR" to locate this information. 358/* .na 359/* .nf 360/* SCHEDULER_README, scheduling algorithm 361/* QSHAPE_README, Postfix queue analysis 362/* LICENSE 363/* .ad 364/* .fi 365/* The Secure Mailer license must be distributed with this software. 366/* AUTHOR(S) 367/* Wietse Venema 368/* IBM T.J. Watson Research 369/* P.O. Box 704 370/* Yorktown Heights, NY 10598, USA 371/* 372/* Preemptive scheduler enhancements: 373/* Patrik Rak 374/* Modra 6 375/* 155 00, Prague, Czech Republic 376/*--*/ 377 378/* System library. */ 379 380#include <sys_defs.h> 381#include <stdlib.h> 382#include <unistd.h> 383#include <ctype.h> 384 385/* Utility library. */ 386 387#include <msg.h> 388#include <events.h> 389#include <vstream.h> 390#include <dict.h> 391 392/* Global library. */ 393 394#include <mail_queue.h> 395#include <recipient_list.h> 396#include <mail_conf.h> 397#include <mail_params.h> 398#include <mail_version.h> 399#include <mail_proto.h> /* QMGR_SCAN constants */ 400#include <mail_flow.h> 401#include <flush_clnt.h> 402 403/* Master process interface */ 404 405#include <master_proto.h> 406#include <mail_server.h> 407 408/* Application-specific. */ 409 410#include "qmgr.h" 411 412 /* 413 * Tunables. 414 */ 415int var_queue_run_delay; 416int var_min_backoff_time; 417int var_max_backoff_time; 418int var_max_queue_time; 419int var_dsn_queue_time; 420int var_qmgr_active_limit; 421int var_qmgr_rcpt_limit; 422int var_qmgr_msg_rcpt_limit; 423int var_xport_rcpt_limit; 424int var_stack_rcpt_limit; 425int var_xport_refill_limit; 426int var_xport_refill_delay; 427int var_delivery_slot_cost; 428int var_delivery_slot_loan; 429int var_delivery_slot_discount; 430int var_min_delivery_slots; 431int var_init_dest_concurrency; 432int var_transport_retry_time; 433int var_dest_con_limit; 434int var_dest_rcpt_limit; 435char *var_defer_xports; 436int var_local_con_lim; 437int var_local_rcpt_lim; 438int var_proc_limit; 439bool var_verp_bounce_off; 440int var_qmgr_clog_warn_time; 441char *var_conc_pos_feedback; 442char *var_conc_neg_feedback; 443int var_conc_cohort_limit; 444int var_conc_feedback_debug; 445int var_dest_rate_delay; 446char *var_def_filter_nexthop; 447int var_qmgr_daemon_timeout; 448int var_qmgr_ipc_timeout; 449 450static QMGR_SCAN *qmgr_scans[2]; 451 452#define QMGR_SCAN_IDX_INCOMING 0 453#define QMGR_SCAN_IDX_DEFERRED 1 454#define QMGR_SCAN_IDX_COUNT (sizeof(qmgr_scans) / sizeof(qmgr_scans[0])) 455 456/* qmgr_deferred_run_event - queue manager heartbeat */ 457 458static void qmgr_deferred_run_event(int unused_event, char *dummy) 459{ 460 461 /* 462 * This routine runs when it is time for another deferred queue scan. 463 * Make sure this routine gets called again in the future. 464 */ 465 qmgr_scan_request(qmgr_scans[QMGR_SCAN_IDX_DEFERRED], QMGR_SCAN_START); 466 event_request_timer(qmgr_deferred_run_event, dummy, var_queue_run_delay); 467} 468 469/* qmgr_trigger_event - respond to external trigger(s) */ 470 471static void qmgr_trigger_event(char *buf, int len, 472 char *unused_service, char **argv) 473{ 474 int incoming_flag = 0; 475 int deferred_flag = 0; 476 int i; 477 478 /* 479 * Sanity check. This service takes no command-line arguments. 480 */ 481 if (argv[0]) 482 msg_fatal("unexpected command-line argument: %s", argv[0]); 483 484 /* 485 * Collapse identical requests that have arrived since we looked last 486 * time. There is no client feedback so there is no need to process each 487 * request in order. And as long as we don't have conflicting requests we 488 * are free to sort them into the most suitable order. 489 */ 490#define QMGR_FLUSH_BEFORE (QMGR_FLUSH_ONCE | QMGR_FLUSH_DFXP) 491 492 for (i = 0; i < len; i++) { 493 if (msg_verbose) 494 msg_info("request: %d (%c)", 495 buf[i], ISALNUM(buf[i]) ? buf[i] : '?'); 496 switch (buf[i]) { 497 case TRIGGER_REQ_WAKEUP: 498 case QMGR_REQ_SCAN_INCOMING: 499 incoming_flag |= QMGR_SCAN_START; 500 break; 501 case QMGR_REQ_SCAN_DEFERRED: 502 deferred_flag |= QMGR_SCAN_START; 503 break; 504 case QMGR_REQ_FLUSH_DEAD: 505 deferred_flag |= QMGR_FLUSH_BEFORE; 506 incoming_flag |= QMGR_FLUSH_BEFORE; 507 break; 508 case QMGR_REQ_SCAN_ALL: 509 deferred_flag |= QMGR_SCAN_ALL; 510 incoming_flag |= QMGR_SCAN_ALL; 511 break; 512 default: 513 if (msg_verbose) 514 msg_info("request ignored"); 515 break; 516 } 517 } 518 519 /* 520 * Process each request type at most once. Modifiers take effect upon the 521 * next queue run. If no queue run is in progress, and a queue scan is 522 * requested, the request takes effect immediately. 523 */ 524 if (incoming_flag != 0) 525 qmgr_scan_request(qmgr_scans[QMGR_SCAN_IDX_INCOMING], incoming_flag); 526 if (deferred_flag != 0) 527 qmgr_scan_request(qmgr_scans[QMGR_SCAN_IDX_DEFERRED], deferred_flag); 528} 529 530/* qmgr_loop - queue manager main loop */ 531 532static int qmgr_loop(char *unused_name, char **unused_argv) 533{ 534 char *path; 535 int token_count; 536 int feed = 0; 537 int scan_idx; /* Priority order scan index */ 538 static int first_scan_idx = QMGR_SCAN_IDX_INCOMING; 539 int last_scan_idx = QMGR_SCAN_IDX_COUNT - 1; 540 int delay; 541 542 /* 543 * This routine runs as part of the event handling loop, after the event 544 * manager has delivered a timer or I/O event (including the completion 545 * of a connection to a delivery process), or after it has waited for a 546 * specified amount of time. The result value of qmgr_loop() specifies 547 * how long the event manager should wait for the next event. 548 */ 549#define DONT_WAIT 0 550#define WAIT_FOR_EVENT (-1) 551 552 /* 553 * Attempt to drain the active queue by allocating a suitable delivery 554 * process and by delivering mail via it. Delivery process allocation and 555 * mail delivery are asynchronous. 556 */ 557 qmgr_active_drain(); 558 559 /* 560 * Let some new blood into the active queue when the queue size is 561 * smaller than some configurable limit. 562 * 563 * We import one message per interrupt, to optimally tune the input count 564 * for the number of delivery agent protocol wait states, as explained in 565 * qmgr_transport.c. 566 */ 567 delay = WAIT_FOR_EVENT; 568 for (scan_idx = 0; qmgr_message_count < var_qmgr_active_limit 569 && scan_idx < QMGR_SCAN_IDX_COUNT; ++scan_idx) { 570 last_scan_idx = (scan_idx + first_scan_idx) % QMGR_SCAN_IDX_COUNT; 571 if ((path = qmgr_scan_next(qmgr_scans[last_scan_idx])) != 0) { 572 delay = DONT_WAIT; 573 if ((feed = qmgr_active_feed(qmgr_scans[last_scan_idx], path)) != 0) 574 break; 575 } 576 } 577 578 /* 579 * Round-robin the queue scans. When the active queue becomes full, 580 * prefer new mail over deferred mail. 581 */ 582 if (qmgr_message_count < var_qmgr_active_limit) { 583 first_scan_idx = (last_scan_idx + 1) % QMGR_SCAN_IDX_COUNT; 584 } else if (first_scan_idx != QMGR_SCAN_IDX_INCOMING) { 585 first_scan_idx = QMGR_SCAN_IDX_INCOMING; 586 } 587 588 /* 589 * Global flow control. If enabled, slow down receiving processes that 590 * get ahead of the queue manager, but don't block them completely. 591 */ 592 if (var_in_flow_delay > 0) { 593 token_count = mail_flow_count(); 594 if (token_count < var_proc_limit) { 595 if (feed != 0 && last_scan_idx == QMGR_SCAN_IDX_INCOMING) 596 mail_flow_put(1); 597 else if (qmgr_scans[QMGR_SCAN_IDX_INCOMING]->handle == 0) 598 mail_flow_put(var_proc_limit - token_count); 599 } else if (token_count > var_proc_limit) { 600 mail_flow_get(token_count - var_proc_limit); 601 } 602 } 603 return (delay); 604} 605 606/* pre_accept - see if tables have changed */ 607 608static void pre_accept(char *unused_name, char **unused_argv) 609{ 610 const char *table; 611 612 if ((table = dict_changed_name()) != 0) { 613 msg_info("table %s has changed -- restarting", table); 614 exit(0); 615 } 616} 617 618/* qmgr_pre_init - pre-jail initialization */ 619 620static void qmgr_pre_init(char *unused_name, char **unused_argv) 621{ 622 flush_init(); 623} 624 625/* qmgr_post_init - post-jail initialization */ 626 627static void qmgr_post_init(char *name, char **unused_argv) 628{ 629 630 /* 631 * Backwards compatibility. 632 */ 633 if (strcmp(var_procname, "nqmgr") == 0) { 634 msg_warn("please update the %s/%s file; the new queue manager", 635 var_config_dir, MASTER_CONF_FILE); 636 msg_warn("(old name: nqmgr) has become the standard queue manager (new name: qmgr)"); 637 msg_warn("support for the name old name (nqmgr) will be removed from Postfix"); 638 } 639 640 /* 641 * Sanity check. 642 */ 643 if (var_qmgr_rcpt_limit < var_qmgr_active_limit) { 644 msg_warn("%s is smaller than %s - adjusting %s", 645 VAR_QMGR_RCPT_LIMIT, VAR_QMGR_ACT_LIMIT, VAR_QMGR_RCPT_LIMIT); 646 var_qmgr_rcpt_limit = var_qmgr_active_limit; 647 } 648 if (var_dsn_queue_time > var_max_queue_time) { 649 msg_warn("%s is larger than %s - adjusting %s", 650 VAR_DSN_QUEUE_TIME, VAR_MAX_QUEUE_TIME, VAR_DSN_QUEUE_TIME); 651 var_dsn_queue_time = var_max_queue_time; 652 } 653 654 /* 655 * This routine runs after the skeleton code has entered the chroot jail. 656 * Prevent automatic process suicide after a limited number of client 657 * requests or after a limited amount of idle time. Move any left-over 658 * entries from the active queue to the incoming queue, and give them a 659 * time stamp into the future, in order to allow ongoing deliveries to 660 * finish first. Start scanning the incoming and deferred queues. 661 * Left-over active queue entries are moved to the incoming queue because 662 * the incoming queue has priority; moving left-overs to the deferred 663 * queue could cause anomalous delays when "postfix reload/start" are 664 * issued often. Override the IPC timeout (default 3600s) so that the 665 * queue manager can reset a broken IPC channel before the watchdog timer 666 * goes off. 667 */ 668 var_ipc_timeout = var_qmgr_ipc_timeout; 669 var_use_limit = 0; 670 var_idle_limit = 0; 671 qmgr_move(MAIL_QUEUE_ACTIVE, MAIL_QUEUE_INCOMING, event_time()); 672 qmgr_scans[QMGR_SCAN_IDX_INCOMING] = qmgr_scan_create(MAIL_QUEUE_INCOMING); 673 qmgr_scans[QMGR_SCAN_IDX_DEFERRED] = qmgr_scan_create(MAIL_QUEUE_DEFERRED); 674 qmgr_scan_request(qmgr_scans[QMGR_SCAN_IDX_INCOMING], QMGR_SCAN_START); 675 qmgr_deferred_run_event(0, (char *) 0); 676} 677 678MAIL_VERSION_STAMP_DECLARE; 679 680/* main - the main program */ 681 682int main(int argc, char **argv) 683{ 684 static const CONFIG_STR_TABLE str_table[] = { 685 VAR_DEFER_XPORTS, DEF_DEFER_XPORTS, &var_defer_xports, 0, 0, 686 VAR_CONC_POS_FDBACK, DEF_CONC_POS_FDBACK, &var_conc_pos_feedback, 1, 0, 687 VAR_CONC_NEG_FDBACK, DEF_CONC_NEG_FDBACK, &var_conc_neg_feedback, 1, 0, 688 VAR_DEF_FILTER_NEXTHOP, DEF_DEF_FILTER_NEXTHOP, &var_def_filter_nexthop, 0, 0, 689 0, 690 }; 691 static const CONFIG_TIME_TABLE time_table[] = { 692 VAR_QUEUE_RUN_DELAY, DEF_QUEUE_RUN_DELAY, &var_queue_run_delay, 1, 0, 693 VAR_MIN_BACKOFF_TIME, DEF_MIN_BACKOFF_TIME, &var_min_backoff_time, 1, 0, 694 VAR_MAX_BACKOFF_TIME, DEF_MAX_BACKOFF_TIME, &var_max_backoff_time, 1, 0, 695 VAR_MAX_QUEUE_TIME, DEF_MAX_QUEUE_TIME, &var_max_queue_time, 0, 8640000, 696 VAR_DSN_QUEUE_TIME, DEF_DSN_QUEUE_TIME, &var_dsn_queue_time, 0, 8640000, 697 VAR_XPORT_RETRY_TIME, DEF_XPORT_RETRY_TIME, &var_transport_retry_time, 1, 0, 698 VAR_QMGR_CLOG_WARN_TIME, DEF_QMGR_CLOG_WARN_TIME, &var_qmgr_clog_warn_time, 0, 0, 699 VAR_XPORT_REFILL_DELAY, DEF_XPORT_REFILL_DELAY, &var_xport_refill_delay, 1, 0, 700 VAR_DEST_RATE_DELAY, DEF_DEST_RATE_DELAY, &var_dest_rate_delay, 0, 0, 701 VAR_QMGR_DAEMON_TIMEOUT, DEF_QMGR_DAEMON_TIMEOUT, &var_qmgr_daemon_timeout, 1, 0, 702 VAR_QMGR_IPC_TIMEOUT, DEF_QMGR_IPC_TIMEOUT, &var_qmgr_ipc_timeout, 1, 0, 703 0, 704 }; 705 static const CONFIG_INT_TABLE int_table[] = { 706 VAR_QMGR_ACT_LIMIT, DEF_QMGR_ACT_LIMIT, &var_qmgr_active_limit, 1, 0, 707 VAR_QMGR_RCPT_LIMIT, DEF_QMGR_RCPT_LIMIT, &var_qmgr_rcpt_limit, 1, 0, 708 VAR_QMGR_MSG_RCPT_LIMIT, DEF_QMGR_MSG_RCPT_LIMIT, &var_qmgr_msg_rcpt_limit, 1, 0, 709 VAR_XPORT_RCPT_LIMIT, DEF_XPORT_RCPT_LIMIT, &var_xport_rcpt_limit, 0, 0, 710 VAR_STACK_RCPT_LIMIT, DEF_STACK_RCPT_LIMIT, &var_stack_rcpt_limit, 0, 0, 711 VAR_XPORT_REFILL_LIMIT, DEF_XPORT_REFILL_LIMIT, &var_xport_refill_limit, 1, 0, 712 VAR_DELIVERY_SLOT_COST, DEF_DELIVERY_SLOT_COST, &var_delivery_slot_cost, 0, 0, 713 VAR_DELIVERY_SLOT_LOAN, DEF_DELIVERY_SLOT_LOAN, &var_delivery_slot_loan, 0, 0, 714 VAR_DELIVERY_SLOT_DISCOUNT, DEF_DELIVERY_SLOT_DISCOUNT, &var_delivery_slot_discount, 0, 100, 715 VAR_MIN_DELIVERY_SLOTS, DEF_MIN_DELIVERY_SLOTS, &var_min_delivery_slots, 0, 0, 716 VAR_INIT_DEST_CON, DEF_INIT_DEST_CON, &var_init_dest_concurrency, 1, 0, 717 VAR_DEST_CON_LIMIT, DEF_DEST_CON_LIMIT, &var_dest_con_limit, 0, 0, 718 VAR_DEST_RCPT_LIMIT, DEF_DEST_RCPT_LIMIT, &var_dest_rcpt_limit, 0, 0, 719 VAR_LOCAL_RCPT_LIMIT, DEF_LOCAL_RCPT_LIMIT, &var_local_rcpt_lim, 0, 0, 720 VAR_LOCAL_CON_LIMIT, DEF_LOCAL_CON_LIMIT, &var_local_con_lim, 0, 0, 721 VAR_PROC_LIMIT, DEF_PROC_LIMIT, &var_proc_limit, 1, 0, 722 VAR_CONC_COHORT_LIM, DEF_CONC_COHORT_LIM, &var_conc_cohort_limit, 0, 0, 723 0, 724 }; 725 static const CONFIG_BOOL_TABLE bool_table[] = { 726 VAR_VERP_BOUNCE_OFF, DEF_VERP_BOUNCE_OFF, &var_verp_bounce_off, 727 VAR_CONC_FDBACK_DEBUG, DEF_CONC_FDBACK_DEBUG, &var_conc_feedback_debug, 728 0, 729 }; 730 731 /* 732 * Fingerprint executables and core dumps. 733 */ 734 MAIL_VERSION_STAMP_ALLOCATE; 735 736 /* 737 * Use the trigger service skeleton, because no-one else should be 738 * monitoring our service port while this process runs, and because we do 739 * not talk back to the client. 740 */ 741 trigger_server_main(argc, argv, qmgr_trigger_event, 742 MAIL_SERVER_INT_TABLE, int_table, 743 MAIL_SERVER_STR_TABLE, str_table, 744 MAIL_SERVER_BOOL_TABLE, bool_table, 745 MAIL_SERVER_TIME_TABLE, time_table, 746 MAIL_SERVER_PRE_INIT, qmgr_pre_init, 747 MAIL_SERVER_POST_INIT, qmgr_post_init, 748 MAIL_SERVER_LOOP, qmgr_loop, 749 MAIL_SERVER_PRE_ACCEPT, pre_accept, 750 MAIL_SERVER_SOLITARY, 751 MAIL_SERVER_WATCHDOG, &var_qmgr_daemon_timeout, 752 0); 753} 754