1/* $NetBSD$ */ 2 3/*++ 4/* NAME 5/* event_server 3 6/* SUMMARY 7/* skeleton multi-threaded mail subsystem 8/* SYNOPSIS 9/* #include <mail_server.h> 10/* 11/* NORETURN event_server_main(argc, argv, service, key, value, ...) 12/* int argc; 13/* char **argv; 14/* void (*service)(VSTREAM *stream, char *service_name, char **argv); 15/* int key; 16/* 17/* void event_server_disconnect(fd) 18/* VSTREAM *stream; 19/* 20/* void event_server_drain() 21/* DESCRIPTION 22/* This module implements a skeleton for multi-threaded 23/* mail subsystems: mail subsystem programs that service multiple 24/* clients at the same time. The resulting program expects to be run 25/* from the \fBmaster\fR process. 26/* 27/* event_server_main() is the skeleton entry point. It should be 28/* called from the application main program. The skeleton does all 29/* the generic command-line processing, initialization of 30/* configurable parameters, and connection management. 31/* Unlike multi_server, this skeleton does not attempt to manage 32/* all the events on a client connection. 33/* The skeleton never returns. 34/* 35/* Arguments: 36/* .IP "void (*service)(VSTREAM *stream, char *service_name, char **argv)" 37/* A pointer to a function that is called by the skeleton each 38/* time a client connects to the program's service port. The 39/* function is run after the program has optionally dropped 40/* its privileges. The application is responsible for managing 41/* subsequent I/O events on the stream, and is responsible for 42/* calling event_server_disconnect() when the stream is closed. 43/* The stream initial state is non-blocking mode. The service 44/* name argument corresponds to the service name in the master.cf 45/* file. The argv argument specifies command-line arguments 46/* left over after options processing. 47/* .PP 48/* Optional arguments are specified as a null-terminated (key, value) 49/* list. Keys and expected values are: 50/* .IP "MAIL_SERVER_INT_TABLE (CONFIG_INT_TABLE *)" 51/* A table with configurable parameters, to be loaded from the 52/* global Postfix configuration file. Tables are loaded in the 53/* order as specified, and multiple instances of the same type 54/* are allowed. 55/* .IP "MAIL_SERVER_STR_TABLE (CONFIG_STR_TABLE *)" 56/* A table with configurable parameters, to be loaded from the 57/* global Postfix configuration file. Tables are loaded in the 58/* order as specified, and multiple instances of the same type 59/* are allowed. 60/* .IP "MAIL_SERVER_BOOL_TABLE (CONFIG_BOOL_TABLE *)" 61/* A table with configurable parameters, to be loaded from the 62/* global Postfix configuration file. Tables are loaded in the 63/* order as specified, and multiple instances of the same type 64/* are allowed. 65/* .IP "MAIL_SERVER_TIME_TABLE (CONFIG_TIME_TABLE *)" 66/* A table with configurable parameters, to be loaded from the 67/* global Postfix configuration file. Tables are loaded in the 68/* order as specified, and multiple instances of the same type 69/* are allowed. 70/* .IP "MAIL_SERVER_RAW_TABLE (CONFIG_RAW_TABLE *)" 71/* A table with configurable parameters, to be loaded from the 72/* global Postfix configuration file. Tables are loaded in the 73/* order as specified, and multiple instances of the same type 74/* are allowed. Raw parameters are not subjected to $name 75/* evaluation. 76/* .IP "MAIL_SERVER_NINT_TABLE (CONFIG_NINT_TABLE *)" 77/* A table with configurable parameters, to be loaded from the 78/* global Postfix configuration file. Tables are loaded in the 79/* order as specified, and multiple instances of the same type 80/* are allowed. 81/* .IP "MAIL_SERVER_NBOOL_TABLE (CONFIG_NBOOL_TABLE *)" 82/* A table with configurable parameters, to be loaded from the 83/* global Postfix configuration file. Tables are loaded in the 84/* order as specified, and multiple instances of the same type 85/* are allowed. 86/* .IP "MAIL_SERVER_PRE_INIT (void *(char *service_name, char **argv))" 87/* A pointer to a function that is called once 88/* by the skeleton after it has read the global configuration file 89/* and after it has processed command-line arguments, but before 90/* the skeleton has optionally relinquished the process privileges. 91/* .sp 92/* Only the last instance of this parameter type is remembered. 93/* .IP "MAIL_SERVER_POST_INIT (void *(char *service_name, char **argv))" 94/* A pointer to a function that is called once 95/* by the skeleton after it has optionally relinquished the process 96/* privileges, but before servicing client connection requests. 97/* .sp 98/* Only the last instance of this parameter type is remembered. 99/* .IP "MAIL_SERVER_LOOP (int *(char *service_name, char **argv))" 100/* A pointer to function that is executed from 101/* within the event loop, whenever an I/O or timer event has happened, 102/* or whenever nothing has happened for a specified amount of time. 103/* The result value of the function specifies how long to wait until 104/* the next event. Specify -1 to wait for "as long as it takes". 105/* .sp 106/* Only the last instance of this parameter type is remembered. 107/* .IP "MAIL_SERVER_EXIT (void *(char *service_name, char **argv))" 108/* A pointer to function that is executed immediately before normal 109/* process termination. 110/* .IP "MAIL_SERVER_PRE_ACCEPT (void *(char *service_name, char **argv))" 111/* Function to be executed prior to accepting a new connection. 112/* .sp 113/* Only the last instance of this parameter type is remembered. 114/* .IP "MAIL_SERVER_PRE_DISCONN (VSTREAM *, char *service_name, char **argv)" 115/* A pointer to a function that is called 116/* by the event_server_disconnect() function (see below). 117/* .sp 118/* Only the last instance of this parameter type is remembered. 119/* .IP "MAIL_SERVER_IN_FLOW_DELAY (none)" 120/* Pause $in_flow_delay seconds when no "mail flow control token" 121/* is available. A token is consumed for each connection request. 122/* .IP MAIL_SERVER_SOLITARY 123/* This service must be configured with process limit of 1. 124/* .IP MAIL_SERVER_UNLIMITED 125/* This service must be configured with process limit of 0. 126/* .IP MAIL_SERVER_PRIVILEGED 127/* This service must be configured as privileged. 128/* .IP "MAIL_SERVER_SLOW_EXIT (void *(char *service_name, char **argv))" 129/* A pointer to a function that is called after "postfix reload" 130/* or "master exit". The application can call event_server_drain() 131/* (see below) to finish ongoing activities in the background. 132/* .IP "MAIL_SERVER_WATCHDOG (int *)" 133/* Override the default 1000s watchdog timeout. The value is 134/* used after command-line and main.cf file processing. 135/* .PP 136/* event_server_disconnect() should be called by the application 137/* to close a client connection. 138/* 139/* event_server_drain() should be called when the application 140/* no longer wishes to accept new client connections. Existing 141/* clients are handled in a background process, and the process 142/* terminates when the last client is disconnected. A non-zero 143/* result means this call should be tried again later. 144/* 145/* The var_use_limit variable limits the number of clients 146/* that a server can service before it commits suicide. This 147/* value is taken from the global \fBmain.cf\fR configuration 148/* file. Setting \fBvar_use_limit\fR to zero disables the 149/* client limit. 150/* 151/* The var_idle_limit variable limits the time that a service 152/* receives no client connection requests before it commits 153/* suicide. This value is taken from the global \fBmain.cf\fR 154/* configuration file. Setting \fBvar_idle_limit\fR to zero 155/* disables the idle limit. 156/* DIAGNOSTICS 157/* Problems and transactions are logged to \fBsyslogd\fR(8). 158/* SEE ALSO 159/* master(8), master process 160/* syslogd(8) system logging 161/* LICENSE 162/* .ad 163/* .fi 164/* The Secure Mailer license must be distributed with this software. 165/* AUTHOR(S) 166/* Wietse Venema 167/* IBM T.J. Watson Research 168/* P.O. Box 704 169/* Yorktown Heights, NY 10598, USA 170/*--*/ 171 172/* System library. */ 173 174#include <sys_defs.h> 175#include <sys/socket.h> 176#include <sys/time.h> /* select() */ 177#include <unistd.h> 178#include <signal.h> 179#include <syslog.h> 180#include <stdlib.h> 181#include <limits.h> 182#include <string.h> 183#include <errno.h> 184#include <fcntl.h> 185#include <stdarg.h> 186#ifdef STRCASECMP_IN_STRINGS_H 187#include <strings.h> 188#endif 189#include <time.h> 190 191#ifdef USE_SYS_SELECT_H 192#include <sys/select.h> /* select() */ 193#endif 194 195/* Utility library. */ 196 197#include <msg.h> 198#include <msg_syslog.h> 199#include <msg_vstream.h> 200#include <chroot_uid.h> 201#include <listen.h> 202#include <events.h> 203#include <vstring.h> 204#include <vstream.h> 205#include <msg_vstream.h> 206#include <mymalloc.h> 207#include <iostuff.h> 208#include <stringops.h> 209#include <sane_accept.h> 210#include <myflock.h> 211#include <safe_open.h> 212#include <listen.h> 213#include <watchdog.h> 214#include <split_at.h> 215 216/* Global library. */ 217 218#include <mail_task.h> 219#include <debug_process.h> 220#include <mail_params.h> 221#include <mail_conf.h> 222#include <mail_dict.h> 223#include <timed_ipc.h> 224#include <resolve_local.h> 225#include <mail_flow.h> 226 227/* Process manager. */ 228 229#include "master_proto.h" 230 231/* Application-specific */ 232 233#include "mail_server.h" 234 235 /* 236 * Global state. 237 */ 238static int client_count; 239static int use_count; 240static int socket_count = 1; 241 242static void (*event_server_service) (VSTREAM *, char *, char **); 243static char *event_server_name; 244static char **event_server_argv; 245static void (*event_server_accept) (int, char *); 246static void (*event_server_onexit) (char *, char **); 247static void (*event_server_pre_accept) (char *, char **); 248static VSTREAM *event_server_lock; 249static int event_server_in_flow_delay; 250static unsigned event_server_generation; 251static void (*event_server_pre_disconn) (VSTREAM *, char *, char **); 252static void (*event_server_slow_exit) (char *, char **); 253static int event_server_watchdog = 1000; 254 255/* event_server_exit - normal termination */ 256 257static NORETURN event_server_exit(void) 258{ 259 if (event_server_onexit) 260 event_server_onexit(event_server_name, event_server_argv); 261 exit(0); 262} 263 264/* event_server_abort - terminate after abnormal master exit */ 265 266static void event_server_abort(int unused_event, char *unused_context) 267{ 268 if (msg_verbose) 269 msg_info("master disconnect -- exiting"); 270 event_disable_readwrite(MASTER_STATUS_FD); 271 if (event_server_slow_exit) 272 event_server_slow_exit(event_server_name, event_server_argv); 273 else 274 event_server_exit(); 275} 276 277/* event_server_timeout - idle time exceeded */ 278 279static void event_server_timeout(int unused_event, char *unused_context) 280{ 281 if (msg_verbose) 282 msg_info("idle timeout -- exiting"); 283 event_server_exit(); 284} 285 286/* event_server_drain - stop accepting new clients */ 287 288int event_server_drain(void) 289{ 290 const char *myname = "event_server_drain"; 291 int fd; 292 293 switch (fork()) { 294 /* Try again later. */ 295 case -1: 296 return (-1); 297 /* Finish existing clients in the background, then terminate. */ 298 case 0: 299 (void) msg_cleanup((MSG_CLEANUP_FN) 0); 300 event_fork(); 301 for (fd = MASTER_LISTEN_FD; fd < MASTER_LISTEN_FD + socket_count; fd++) { 302 event_disable_readwrite(fd); 303 (void) close(fd); 304 /* Play safe - don't reuse this file number. */ 305 if (DUP2(STDIN_FILENO, fd) < 0) 306 msg_warn("%s: dup2(%d, %d): %m", myname, STDIN_FILENO, fd); 307 } 308 var_use_limit = 1; 309 return (0); 310 /* Let the master start a new process. */ 311 default: 312 exit(0); 313 } 314} 315 316/* event_server_disconnect - terminate client session */ 317 318void event_server_disconnect(VSTREAM *stream) 319{ 320 if (msg_verbose) 321 msg_info("connection closed fd %d", vstream_fileno(stream)); 322 if (event_server_pre_disconn) 323 event_server_pre_disconn(stream, event_server_name, event_server_argv); 324 (void) vstream_fclose(stream); 325 client_count--; 326 /* Avoid integer wrap-around in a persistent process. */ 327 if (use_count < INT_MAX) 328 use_count++; 329 if (client_count == 0 && var_idle_limit > 0) 330 event_request_timer(event_server_timeout, (char *) 0, var_idle_limit); 331} 332 333/* event_server_execute - in case (char *) != (struct *) */ 334 335static void event_server_execute(int unused_event, char *context) 336{ 337 VSTREAM *stream = (VSTREAM *) context; 338 339 if (event_server_lock != 0 340 && myflock(vstream_fileno(event_server_lock), INTERNAL_LOCK, 341 MYFLOCK_OP_NONE) < 0) 342 msg_fatal("select unlock: %m"); 343 344 /* 345 * Do bother the application when the client disconnected. Don't drop the 346 * already accepted client request after "postfix reload"; that would be 347 * rude. 348 */ 349 if (master_notify(var_pid, event_server_generation, MASTER_STAT_TAKEN) < 0) 350 /* void */ ; 351 event_server_service(stream, event_server_name, event_server_argv); 352 if (master_notify(var_pid, event_server_generation, MASTER_STAT_AVAIL) < 0) 353 event_server_abort(EVENT_NULL_TYPE, EVENT_NULL_CONTEXT); 354} 355 356/* event_server_wakeup - wake up application */ 357 358static void event_server_wakeup(int fd) 359{ 360 VSTREAM *stream; 361 char *tmp; 362 363#if defined(F_DUPFD) && (EVENTS_STYLE != EVENTS_STYLE_SELECT) 364#ifndef THRESHOLD_FD_WORKAROUND 365#define THRESHOLD_FD_WORKAROUND 128 366#endif 367 int new_fd; 368 369 /* 370 * Leave some handles < FD_SETSIZE for DBMS libraries, in the unlikely 371 * case of a multi-server with a thousand clients. 372 */ 373 if (fd < THRESHOLD_FD_WORKAROUND) { 374 if ((new_fd = fcntl(fd, F_DUPFD, THRESHOLD_FD_WORKAROUND)) < 0) 375 msg_fatal("fcntl F_DUPFD: %m"); 376 (void) close(fd); 377 fd = new_fd; 378 } 379#endif 380 if (msg_verbose) 381 msg_info("connection established fd %d", fd); 382 non_blocking(fd, BLOCKING); 383 close_on_exec(fd, CLOSE_ON_EXEC); 384 client_count++; 385 stream = vstream_fdopen(fd, O_RDWR); 386 tmp = concatenate(event_server_name, " socket", (char *) 0); 387 vstream_control(stream, VSTREAM_CTL_PATH, tmp, VSTREAM_CTL_END); 388 myfree(tmp); 389 timed_ipc_setup(stream); 390 if (event_server_in_flow_delay && mail_flow_get(1) < 0) 391 event_request_timer(event_server_execute, (char *) stream, 392 var_in_flow_delay); 393 else 394 event_server_execute(0, (char *) stream); 395} 396 397/* event_server_accept_local - accept client connection request */ 398 399static void event_server_accept_local(int unused_event, char *context) 400{ 401 int listen_fd = CAST_CHAR_PTR_TO_INT(context); 402 int time_left = -1; 403 int fd; 404 405 /* 406 * Be prepared for accept() to fail because some other process already 407 * got the connection (the number of processes competing for clients is 408 * kept small, so this is not a "thundering herd" problem). If the 409 * accept() succeeds, be sure to disable non-blocking I/O, in order to 410 * minimize confusion. 411 */ 412 if (client_count == 0 && var_idle_limit > 0) 413 time_left = event_cancel_timer(event_server_timeout, (char *) 0); 414 415 if (event_server_pre_accept) 416 event_server_pre_accept(event_server_name, event_server_argv); 417 fd = LOCAL_ACCEPT(listen_fd); 418 if (event_server_lock != 0 419 && myflock(vstream_fileno(event_server_lock), INTERNAL_LOCK, 420 MYFLOCK_OP_NONE) < 0) 421 msg_fatal("select unlock: %m"); 422 if (fd < 0) { 423 if (errno != EAGAIN) 424 msg_error("accept connection: %m"); 425 if (time_left >= 0) 426 event_request_timer(event_server_timeout, (char *) 0, time_left); 427 return; 428 } 429 event_server_wakeup(fd); 430} 431 432#ifdef MASTER_XPORT_NAME_PASS 433 434/* event_server_accept_pass - accept descriptor */ 435 436static void event_server_accept_pass(int unused_event, char *context) 437{ 438 int listen_fd = CAST_CHAR_PTR_TO_INT(context); 439 int time_left = -1; 440 int fd; 441 442 /* 443 * Be prepared for accept() to fail because some other process already 444 * got the connection (the number of processes competing for clients is 445 * kept small, so this is not a "thundering herd" problem). If the 446 * accept() succeeds, be sure to disable non-blocking I/O, in order to 447 * minimize confusion. 448 */ 449 if (client_count == 0 && var_idle_limit > 0) 450 time_left = event_cancel_timer(event_server_timeout, (char *) 0); 451 452 if (event_server_pre_accept) 453 event_server_pre_accept(event_server_name, event_server_argv); 454 fd = PASS_ACCEPT(listen_fd); 455 if (event_server_lock != 0 456 && myflock(vstream_fileno(event_server_lock), INTERNAL_LOCK, 457 MYFLOCK_OP_NONE) < 0) 458 msg_fatal("select unlock: %m"); 459 if (fd < 0) { 460 if (errno != EAGAIN) 461 msg_error("accept connection: %m"); 462 if (time_left >= 0) 463 event_request_timer(event_server_timeout, (char *) 0, time_left); 464 return; 465 } 466 event_server_wakeup(fd); 467} 468 469#endif 470 471/* event_server_accept_inet - accept client connection request */ 472 473static void event_server_accept_inet(int unused_event, char *context) 474{ 475 int listen_fd = CAST_CHAR_PTR_TO_INT(context); 476 int time_left = -1; 477 int fd; 478 479 /* 480 * Be prepared for accept() to fail because some other process already 481 * got the connection (the number of processes competing for clients is 482 * kept small, so this is not a "thundering herd" problem). If the 483 * accept() succeeds, be sure to disable non-blocking I/O, in order to 484 * minimize confusion. 485 */ 486 if (client_count == 0 && var_idle_limit > 0) 487 time_left = event_cancel_timer(event_server_timeout, (char *) 0); 488 489 if (event_server_pre_accept) 490 event_server_pre_accept(event_server_name, event_server_argv); 491 fd = inet_accept(listen_fd); 492 if (event_server_lock != 0 493 && myflock(vstream_fileno(event_server_lock), INTERNAL_LOCK, 494 MYFLOCK_OP_NONE) < 0) 495 msg_fatal("select unlock: %m"); 496 if (fd < 0) { 497 if (errno != EAGAIN) 498 msg_error("accept connection: %m"); 499 if (time_left >= 0) 500 event_request_timer(event_server_timeout, (char *) 0, time_left); 501 return; 502 } 503 event_server_wakeup(fd); 504} 505 506/* event_server_main - the real main program */ 507 508NORETURN event_server_main(int argc, char **argv, MULTI_SERVER_FN service,...) 509{ 510 const char *myname = "event_server_main"; 511 VSTREAM *stream = 0; 512 char *root_dir = 0; 513 char *user_name = 0; 514 int debug_me = 0; 515 int daemon_mode = 1; 516 char *service_name = basename(argv[0]); 517 int delay; 518 int c; 519 int fd; 520 va_list ap; 521 MAIL_SERVER_INIT_FN pre_init = 0; 522 MAIL_SERVER_INIT_FN post_init = 0; 523 MAIL_SERVER_LOOP_FN loop = 0; 524 int key; 525 char *transport = 0; 526 527#if 0 528 char *lock_path; 529 VSTRING *why; 530 531#endif 532 int alone = 0; 533 int zerolimit = 0; 534 WATCHDOG *watchdog; 535 char *oname_val; 536 char *oname; 537 char *oval; 538 const char *err; 539 char *generation; 540 int msg_vstream_needed = 0; 541 int redo_syslog_init = 0; 542 543 /* 544 * Process environment options as early as we can. 545 */ 546 if (getenv(CONF_ENV_VERB)) 547 msg_verbose = 1; 548 if (getenv(CONF_ENV_DEBUG)) 549 debug_me = 1; 550 551 /* 552 * Don't die when a process goes away unexpectedly. 553 */ 554 signal(SIGPIPE, SIG_IGN); 555 556 /* 557 * Don't die for frivolous reasons. 558 */ 559#ifdef SIGXFSZ 560 signal(SIGXFSZ, SIG_IGN); 561#endif 562 563 /* 564 * May need this every now and then. 565 */ 566 var_procname = mystrdup(basename(argv[0])); 567 set_mail_conf_str(VAR_PROCNAME, var_procname); 568 569 /* 570 * Initialize logging and exit handler. Do the syslog first, so that its 571 * initialization completes before we enter the optional chroot jail. 572 */ 573 msg_syslog_init(mail_task(var_procname), LOG_PID, LOG_FACILITY); 574 if (msg_verbose) 575 msg_info("daemon started"); 576 577 /* 578 * Initialize from the configuration file. Allow command-line options to 579 * override compiled-in defaults or configured parameter values. 580 */ 581 mail_conf_suck(); 582 583 /* 584 * Register dictionaries that use higher-level interfaces and protocols. 585 */ 586 mail_dict_init(); 587 588 /* 589 * Pick up policy settings from master process. Shut up error messages to 590 * stderr, because no-one is going to see them. 591 */ 592 opterr = 0; 593 while ((c = GETOPT(argc, argv, "cdDi:lm:n:o:s:St:uvVz")) > 0) { 594 switch (c) { 595 case 'c': 596 root_dir = "setme"; 597 break; 598 case 'd': 599 daemon_mode = 0; 600 break; 601 case 'D': 602 debug_me = 1; 603 break; 604 case 'i': 605 mail_conf_update(VAR_MAX_IDLE, optarg); 606 break; 607 case 'l': 608 alone = 1; 609 break; 610 case 'm': 611 mail_conf_update(VAR_MAX_USE, optarg); 612 break; 613 case 'n': 614 service_name = optarg; 615 break; 616 case 'o': 617 oname_val = mystrdup(optarg); 618 if ((err = split_nameval(oname_val, &oname, &oval)) != 0) 619 msg_fatal("invalid \"-o %s\" option value: %s", optarg, err); 620 mail_conf_update(oname, oval); 621 if (strcmp(oname, VAR_SYSLOG_NAME) == 0) 622 redo_syslog_init = 1; 623 myfree(oname_val); 624 break; 625 case 's': 626 if ((socket_count = atoi(optarg)) <= 0) 627 msg_fatal("invalid socket_count: %s", optarg); 628 break; 629 case 'S': 630 stream = VSTREAM_IN; 631 break; 632 case 'u': 633 user_name = "setme"; 634 break; 635 case 't': 636 transport = optarg; 637 break; 638 case 'v': 639 msg_verbose++; 640 break; 641 case 'V': 642 if (++msg_vstream_needed == 1) 643 msg_vstream_init(mail_task(var_procname), VSTREAM_ERR); 644 break; 645 case 'z': 646 zerolimit = 1; 647 break; 648 default: 649 msg_fatal("invalid option: %c", c); 650 break; 651 } 652 } 653 654 /* 655 * Initialize generic parameters. 656 */ 657 mail_params_init(); 658 if (redo_syslog_init) 659 msg_syslog_init(mail_task(var_procname), LOG_PID, LOG_FACILITY); 660 661 /* 662 * If not connected to stdin, stdin must not be a terminal. 663 */ 664 if (daemon_mode && stream == 0 && isatty(STDIN_FILENO)) { 665 msg_vstream_init(var_procname, VSTREAM_ERR); 666 msg_fatal("do not run this command by hand"); 667 } 668 669 /* 670 * Application-specific initialization. 671 */ 672 va_start(ap, service); 673 while ((key = va_arg(ap, int)) != 0) { 674 switch (key) { 675 case MAIL_SERVER_INT_TABLE: 676 get_mail_conf_int_table(va_arg(ap, CONFIG_INT_TABLE *)); 677 break; 678 case MAIL_SERVER_STR_TABLE: 679 get_mail_conf_str_table(va_arg(ap, CONFIG_STR_TABLE *)); 680 break; 681 case MAIL_SERVER_BOOL_TABLE: 682 get_mail_conf_bool_table(va_arg(ap, CONFIG_BOOL_TABLE *)); 683 break; 684 case MAIL_SERVER_TIME_TABLE: 685 get_mail_conf_time_table(va_arg(ap, CONFIG_TIME_TABLE *)); 686 break; 687 case MAIL_SERVER_RAW_TABLE: 688 get_mail_conf_raw_table(va_arg(ap, CONFIG_RAW_TABLE *)); 689 break; 690 case MAIL_SERVER_NINT_TABLE: 691 get_mail_conf_nint_table(va_arg(ap, CONFIG_NINT_TABLE *)); 692 break; 693 case MAIL_SERVER_NBOOL_TABLE: 694 get_mail_conf_nbool_table(va_arg(ap, CONFIG_NBOOL_TABLE *)); 695 break; 696 case MAIL_SERVER_PRE_INIT: 697 pre_init = va_arg(ap, MAIL_SERVER_INIT_FN); 698 break; 699 case MAIL_SERVER_POST_INIT: 700 post_init = va_arg(ap, MAIL_SERVER_INIT_FN); 701 break; 702 case MAIL_SERVER_LOOP: 703 loop = va_arg(ap, MAIL_SERVER_LOOP_FN); 704 break; 705 case MAIL_SERVER_EXIT: 706 event_server_onexit = va_arg(ap, MAIL_SERVER_EXIT_FN); 707 break; 708 case MAIL_SERVER_PRE_ACCEPT: 709 event_server_pre_accept = va_arg(ap, MAIL_SERVER_ACCEPT_FN); 710 break; 711 case MAIL_SERVER_PRE_DISCONN: 712 event_server_pre_disconn = va_arg(ap, MAIL_SERVER_DISCONN_FN); 713 break; 714 case MAIL_SERVER_IN_FLOW_DELAY: 715 event_server_in_flow_delay = 1; 716 break; 717 case MAIL_SERVER_SOLITARY: 718 if (stream == 0 && !alone) 719 msg_fatal("service %s requires a process limit of 1", 720 service_name); 721 break; 722 case MAIL_SERVER_UNLIMITED: 723 if (stream == 0 && !zerolimit) 724 msg_fatal("service %s requires a process limit of 0", 725 service_name); 726 break; 727 case MAIL_SERVER_PRIVILEGED: 728 if (user_name) 729 msg_fatal("service %s requires privileged operation", 730 service_name); 731 break; 732 case MAIL_SERVER_WATCHDOG: 733 event_server_watchdog = *va_arg(ap, int *); 734 break; 735 case MAIL_SERVER_SLOW_EXIT: 736 event_server_slow_exit = va_arg(ap, MAIL_SERVER_SLOW_EXIT_FN); 737 break; 738 default: 739 msg_panic("%s: unknown argument type: %d", myname, key); 740 } 741 } 742 va_end(ap); 743 744 if (root_dir) 745 root_dir = var_queue_dir; 746 if (user_name) 747 user_name = var_mail_owner; 748 749 /* 750 * Can options be required? 751 */ 752 if (stream == 0) { 753 if (transport == 0) 754 msg_fatal("no transport type specified"); 755 if (strcasecmp(transport, MASTER_XPORT_NAME_INET) == 0) 756 event_server_accept = event_server_accept_inet; 757 else if (strcasecmp(transport, MASTER_XPORT_NAME_UNIX) == 0) 758 event_server_accept = event_server_accept_local; 759#ifdef MASTER_XPORT_NAME_PASS 760 else if (strcasecmp(transport, MASTER_XPORT_NAME_PASS) == 0) 761 event_server_accept = event_server_accept_pass; 762#endif 763 else 764 msg_fatal("unsupported transport type: %s", transport); 765 } 766 767 /* 768 * Retrieve process generation from environment. 769 */ 770 if ((generation = getenv(MASTER_GEN_NAME)) != 0) { 771 if (!alldig(generation)) 772 msg_fatal("bad generation: %s", generation); 773 OCTAL_TO_UNSIGNED(event_server_generation, generation); 774 if (msg_verbose) 775 msg_info("process generation: %s (%o)", 776 generation, event_server_generation); 777 } 778 779 /* 780 * Optionally start the debugger on ourself. 781 */ 782 if (debug_me) 783 debug_process(); 784 785 /* 786 * Traditionally, BSD select() can't handle multiple processes selecting 787 * on the same socket, and wakes up every process in select(). See TCP/IP 788 * Illustrated volume 2 page 532. We avoid select() collisions with an 789 * external lock file. 790 */ 791 792 /* 793 * XXX Can't compete for exclusive access to the listen socket because we 794 * also have to monitor existing client connections for service requests. 795 */ 796#if 0 797 if (stream == 0 && !alone) { 798 lock_path = concatenate(DEF_PID_DIR, "/", transport, 799 ".", service_name, (char *) 0); 800 why = vstring_alloc(1); 801 if ((event_server_lock = safe_open(lock_path, O_CREAT | O_RDWR, 0600, 802 (struct stat *) 0, -1, -1, why)) == 0) 803 msg_fatal("open lock file %s: %s", lock_path, vstring_str(why)); 804 close_on_exec(vstream_fileno(event_server_lock), CLOSE_ON_EXEC); 805 myfree(lock_path); 806 vstring_free(why); 807 } 808#endif 809 810 /* 811 * Set up call-back info. 812 */ 813 event_server_service = service; 814 event_server_name = service_name; 815 event_server_argv = argv + optind; 816 817 /* 818 * Run pre-jail initialization. 819 */ 820 if (chdir(var_queue_dir) < 0) 821 msg_fatal("chdir(\"%s\"): %m", var_queue_dir); 822 if (pre_init) 823 pre_init(event_server_name, event_server_argv); 824 825 /* 826 * Optionally, restrict the damage that this process can do. 827 */ 828 resolve_local_init(); 829 tzset(); 830 chroot_uid(root_dir, user_name); 831 832 /* 833 * Run post-jail initialization. 834 */ 835 if (post_init) 836 post_init(event_server_name, event_server_argv); 837 838 /* 839 * Are we running as a one-shot server with the client connection on 840 * standard input? If so, make sure the output is written to stdout so as 841 * to satisfy common expectation. 842 */ 843 if (stream != 0) { 844 vstream_control(stream, 845 VSTREAM_CTL_DOUBLE, 846 VSTREAM_CTL_WRITE_FD, STDOUT_FILENO, 847 VSTREAM_CTL_END); 848 service(stream, event_server_name, event_server_argv); 849 vstream_fflush(stream); 850 event_server_exit(); 851 } 852 853 /* 854 * Running as a semi-resident server. Service connection requests. 855 * Terminate when we have serviced a sufficient number of clients, when 856 * no-one has been talking to us for a configurable amount of time, or 857 * when the master process terminated abnormally. 858 */ 859 if (var_idle_limit > 0) 860 event_request_timer(event_server_timeout, (char *) 0, var_idle_limit); 861 for (fd = MASTER_LISTEN_FD; fd < MASTER_LISTEN_FD + socket_count; fd++) { 862 event_enable_read(fd, event_server_accept, CAST_INT_TO_CHAR_PTR(fd)); 863 close_on_exec(fd, CLOSE_ON_EXEC); 864 } 865 event_enable_read(MASTER_STATUS_FD, event_server_abort, (char *) 0); 866 close_on_exec(MASTER_STATUS_FD, CLOSE_ON_EXEC); 867 close_on_exec(MASTER_FLOW_READ, CLOSE_ON_EXEC); 868 close_on_exec(MASTER_FLOW_WRITE, CLOSE_ON_EXEC); 869 watchdog = watchdog_create(event_server_watchdog, 870 (WATCHDOG_FN) 0, (char *) 0); 871 872 /* 873 * The event loop, at last. 874 */ 875 while (var_use_limit == 0 || use_count < var_use_limit || client_count > 0) { 876 if (event_server_lock != 0) { 877 watchdog_stop(watchdog); 878 if (myflock(vstream_fileno(event_server_lock), INTERNAL_LOCK, 879 MYFLOCK_OP_EXCLUSIVE) < 0) 880 msg_fatal("select lock: %m"); 881 } 882 watchdog_start(watchdog); 883 delay = loop ? loop(event_server_name, event_server_argv) : -1; 884 event_loop(delay); 885 } 886 event_server_exit(); 887} 888