ramkomd.c 18 KB
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/*
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 * $Id: ramkomd.c,v 0.122 2003/08/01 22:29:39 ceder Exp $
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 * Copyright (C) 1991-1999, 2001-2002  Lysator Academic Computer Association.
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 *
 * This file is part of the LysKOM server.
 * 
 * LysKOM is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 1, or (at your option) 
 * any later version.
 * 
 * LysKOM is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with LysKOM; see the file COPYING.  If not, write to
 * Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
 * or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
 * MA 02139, USA.
 *
 * Please mail bug reports to bug-lyskom@lysator.liu.se. 
 */
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/*
 * The next comment block is a historic comment, written in Swedish
 * using ISO 646 since nobody in Lysator knew about ISO 8859-1 by
 * then.  It translates, rougly, to "This is the main program of the
 * server.  It will hopefully be bigger than it is at the moment.
 * Created by Willfr 31-mar-1990."
 */
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/*
 * Detta {r serverns huvudprogram. Det kommer f|rhoppningsvis bli st|rre
 * {n det {r just nu...
 *
 * Created by Willf|r 31/3-90
 *
 * It has grown! /ceder
 */

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#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

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#ifdef HAVE_LOCALE_H
#  include <locale.h>
#endif
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#include <stdio.h>
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#include <signal.h>
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#ifdef HAVE_STDLIB_H
#  include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#  include <string.h>
#endif
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#include <sys/wait.h>
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#include "timewrap.h"
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#ifdef HAVE_SYS_RESOURCE_H
#  include <sys/resource.h>
#endif
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#include <unistd.h>
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#include <setjmp.h>
#if defined(HAVE_SYS_PARAM_H) && !defined(HAVE_GETCWD)
# include <sys/param.h>
#endif
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include "oop.h"

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#include "exp.h"
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#include "s-string.h"
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#include "misc-types.h"
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#include "kom-types.h"
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#include "com.h"
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#include "async.h"
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#include "connections.h"
#include "internal-connections.h"
#include "kom-errno.h"
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#include "oop-malloc.h"
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#include "isc-malloc.h"
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#include "isc-interface.h"
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#include "kom-config.h"
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#include "cache.h"
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#include "string-malloc.h"
#include "lyskomd.h"
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#include "log.h"
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#include "server/smalloc.h"
#include "kom-memory.h"
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#include "conf-file.h"
#include "param.h"
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#include "server-config.h"
#include "manipulate.h"
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#include "version-info.h"
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#include "aux-items.h"
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#include "admin.h"
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#include "unused.h"
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#include "sigflags.h"
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#include "local-to-global.h"
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#include "server-time.h"
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#include "lockdb.h"
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#include "linkansi.h"
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#ifdef TRACED_ALLOCATIONS
#  include "trace-alloc.h"
#endif
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#include "eintr.h"
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#include "stats.h"
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#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_OFILE) && !defined(RLIMIT_NOFILE)
#  define RLIMIT_NOFILE RLIMIT_OFILE
#endif

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#if !HAVE_RLIM_T
typedef int rlim_t;
#endif

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struct timeval current_time = { 0, 0 };
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#ifndef NDEBUG
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int	buglevel = 0;
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#endif
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/* Don't place lyskomd in the background.  Write the log to stdout.
   Prompt for input on stdin before exiting.  This is primarily
   intended for debugging and the test suite. */
static int foreground = 0;

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static oop_adapter_signal *kom_signal_adapter;

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static void dump_exit_statistics(void);
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static void free_kom_info(void);
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static oop_call_signal sighandler_hup;
static oop_call_signal sighandler_quit;
static oop_call_signal sighandler_usr1;
static oop_call_signal sighandler_usr2;
static oop_call_signal sighandler_winch;

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#ifdef HAVE_STRUCT_SIGACTION

/* Assigning SIG_IGN to sa_handler results in

    ramkomd.c:310: warning: function declaration isn't a prototype

  on certain compilers.  By performing the assignment in a function
  the number of warnings are reduced. */

static inline void
set_handler_sig_ign(struct sigaction *ptr)
{
    ptr->sa_handler = SIG_IGN;
}

#endif

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static isc_write_queue_change_cb write_queue_change_callback;

static void
write_queue_change_callback(int delta)
{
    update_stat(STAT_SEND_QUEUE, delta);
}


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static void
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server_init(const char *host, const char * client_port)
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{
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    struct isc_scb *listen_client;
    union isc_address *isc_adr = NULL;
    oop_source *src;
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#ifdef HAVE_STRUCT_SIGACTION
    struct sigaction act;
#endif

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    oop_malloc = &oop_malloc_wrapper;
    oop_realloc = &oop_realloc_wrapper;
    oop_free = &oop_free_wrapper;

    kom_server_oop_src = oop_sys_new();
    if (kom_server_oop_src == NULL)
	restart_kom("server_init: can't get system event source\n");
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    kom_signal_adapter = oop_signal_new(oop_sys_source(kom_server_oop_src));
    if (kom_signal_adapter == NULL)
	restart_kom("server_init: can't create signal adapter\n");

    /* Ignore the signals before we register them with liboop.  That
       way, when liboop reinstalls the old signal handler during
       shutdown, we will ignore them rather than stop prematurely
       during the shutdown.  This is especially important for the
       SIGHUP signal, which is sent periodically by updateLysKOM. */
#ifdef HAVE_STRUCT_SIGACTION
    sigemptyset(&act.sa_mask);
    act.sa_flags = 0;
    set_handler_sig_ign(&act);
    sigaction(SIGHUP, &act, NULL);
    sigaction(SIGQUIT, &act, NULL);
    sigaction(SIGUSR1, &act, NULL);
    sigaction(SIGUSR2, &act, NULL);
    sigaction(SIGWINCH, &act, NULL);
#else
    signal(SIGHUP, SIG_IGN);
    signal(SIGQUIT, SIG_IGN);
    signal(SIGUSR1, SIG_IGN);
    signal(SIGUSR2, SIG_IGN);
    signal(SIGWINCH, SIG_IGN);
#endif

    src = oop_signal_source(kom_signal_adapter);
    oop_signal_use_sa_restart();
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    src->on_signal(src, SIGHUP, sighandler_hup, NULL);
    src->on_signal(src, SIGQUIT, sighandler_quit, NULL);
    src->on_signal(src, SIGUSR1, sighandler_usr1, NULL);
    src->on_signal(src, SIGUSR2, sighandler_usr2, NULL);
    src->on_signal(src, SIGWINCH, sighandler_winch, NULL);

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    /*
    ** Setup some parameters here
    */
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    isc_setallocfn(&isc_malloc_wrapper,
		   &isc_realloc_wrapper,
		   &isc_free_wrapper);

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    kom_server_mcb  = isc_initialize(oop_sys_source(kom_server_oop_src),
				     write_queue_change_callback);
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    if ( kom_server_mcb == NULL )
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	restart_kom("server_init: can't isc_initialize()\n");
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    isc_cfg_fd_relocate(kom_server_mcb, PROTECTED_FDS);
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    isc_cfg_stale_timeout(kom_server_mcb, param.stale_timeout);
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    isc_cfg_queue_size(kom_server_mcb,
		       param.maxqueuedsize_bytes,
		       param.maxmsgsize,
		       param.maxqueuedsize,
		       param.maxdequeuelen);
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    listen_client = isc_listentcp(kom_server_mcb, host, client_port,
				  handle_accept_event);
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    if (listen_client == NULL)
        restart_kom("server_init: can't isc_listentcp(CLIENT)\n");
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    isc_adr = isc_getladdress (listen_client);
    if (isc_adr == NULL)
	restart_kom("server_init(): can't isc_getladdress (listen_client)\n");

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    kom_log("Listening for clients on %d.\n", isc_getportnum(isc_adr));
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    isc_freeaddress (isc_adr);
    
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    /*
     * Ignore SIGPIPE, which the server gets if it tries to write to a
     * socket and the client has died. The server will anyhow handle
     * this situation correct.
     */
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#ifdef HAVE_STRUCT_SIGACTION
    sigemptyset(&act.sa_mask);
    act.sa_flags = 0;
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    set_handler_sig_ign(&act);
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    sigaction(SIGPIPE, &act, NULL);
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#else
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    signal(SIGPIPE, SIG_IGN);
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#endif
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}

static void
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init_data_base(void)
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{
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    kom_log("Database = %s\n",  param.datafile_name);
    kom_log("Backup = %s\n", param.backupfile_name);
    kom_log("2nd Backup = %s\n", param.backupfile_name_2);
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    kom_log("Lock File = %s\n", param.lockfile_name);
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    if ( init_cache() == FAILURE )
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	restart_kom ("Cannot find database.\n");
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}

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static void *
sighandler_hup(oop_source *UNUSED(source),
	       int UNUSED(sig),
	       void *UNUSED(user))
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{
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    kom_log ("Signal HUP received. Shutting down server.\n");
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    go_and_die = TRUE;
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    return OOP_HALT;
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}

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static void *
sighandler_quit(oop_source *UNUSED(source),
		int UNUSED(sig),
		void *UNUSED(user))
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{
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    kom_log ("Signal QUIT received - syncing...\n");
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    cache_sync_all();
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    kom_log ("Dumping core now.\n");
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    abort();
}

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static void *
sighandler_usr1(oop_source *UNUSED(source),
		int UNUSED(sig),
		void *UNUSED(user))
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{
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    dump_statistics();
    return OOP_CONTINUE;
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}

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static void *
sighandler_usr2(oop_source *UNUSED(source),
		int UNUSED(sig),
		void *UNUSED(user))
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{
    int		  child;

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    kom_log ("Signal USR2 received - will dump core now.  (Check that child dies.)\n");
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    if ((child = fork()) == 0)
    {
	abort();
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	kom_log ("Abort() failed!!!\n");
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	exit(1);
    }
    else if (child < 0)
    {
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	kom_log ("Couldn't fork.\n");
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    }
    else
    {
	wait (NULL);
    }
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    return OOP_CONTINUE;
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}

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static void *
sighandler_winch(oop_source *UNUSED(source),
		 int UNUSED(sig),
		 void *UNUSED(user))
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{
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    free_aux_item_definitions();
    initialize_aux_items(param.aux_def_file);
    kom_log("Signal WINCH received. aux definitions reloaded.\n");
    return OOP_CONTINUE;
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}

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static void
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save_pid(void)
{
    FILE *fp;

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    if ((fp = i_fopen(param.pid_name, "w")) == NULL)
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	return;

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    fprintf(fp, "%ld\n", (long)getpid());
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    i_fclose(fp);
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}

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static void
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go_daemon(void)
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{
    pid_t child;
    int fd;
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#ifdef HAVE_STRUCT_SIGACTION
    struct sigaction act;
#endif
    
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    if (foreground != 0)
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    {
	return;
    }

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    if (getppid() != 1)
    {
	/* We were not invoked from /etc/inittab, so
	   disassociate from controlling terminal. */

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#ifdef HAVE_STRUCT_SIGACTION
	sigemptyset(&act.sa_mask);
	act.sa_flags = 0;
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	set_handler_sig_ign(&act);
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#  ifdef SIGTTOU
	sigaction(SIGTTOU, &act, NULL);
#  endif
#  ifdef SIGTTIN
	sigaction(SIGTTIN, &act, NULL);
#  endif
#  ifdef SIGTSTP
	sigaction(SIGTSTP, &act, NULL);
#  endif

#else  /* !HAVE_STRUCT_SIGACTION */

#  ifdef SIGTTOU
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	signal(SIGTTOU, SIG_IGN);
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#  endif
#  ifdef SIGTTIN
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	signal(SIGTTIN, SIG_IGN);
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#  endif
#  ifdef SIGTSTP
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	signal(SIGTSTP, SIG_IGN);
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#  endif

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#endif

	child = fork();
	if (child < 0)
	    restart_kom("fork failed: %d\n", errno);
	else if (child > 0)
	    exit (0);		/* parent */
	
	setsid();
    }

    /* Close all file descriptors */
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    for (fd = 0; fd < fd_ceiling; fd++)
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	close(fd);
    if (open("/dev/null", O_RDONLY) != 0
	||open("/dev/null", O_WRONLY) != 1
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	||open(param.logfile_name, O_WRONLY|O_CREAT|O_APPEND, 0644) != 2)
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    {
	/* Kinda stupid to try to log an error message now, but
	   who knows? */
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	restart_kom("open of log file failed: %d\n", errno);
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    }
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    kom_log("*** Version %s (process %lu) coming up.\n",
            kom_version_info.server_version, (unsigned long)getpid());
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}

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static void
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initialize(const char *config_file)
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{
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#ifdef USING_RLIMIT_NOFILE
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    struct rlimit rlim;
#endif

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    read_configuration(config_file);
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    initialize_aux_items(param.aux_def_file);
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#ifdef HAVE_LOCALE_H
    if (param.use_locale != NULL)
	if (setlocale(LC_CTYPE, param.use_locale) == NULL)
	{
	    fprintf(stderr, "setlocale: ");
	    perror(param.use_locale);
	    exit(1);
	}
#else
    if (param.use_locale != NULL)
    {
	fprintf(stderr, "locale not supported in your environment.\n");
	exit(1);
    }
#endif
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    if (param.no_files != -1 && param.no_files > FD_SETSIZE)
    {
	fprintf(stderr,
		"The \"Open files: %ld\" is too large: FD_SETSIZE is %ld\n",
		(long)param.no_files, (long)FD_SETSIZE);
	exit(1);
    }

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#ifdef USING_RLIMIT_NOFILE
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    if (getrlimit(RLIMIT_NOFILE, &rlim) < 0)
    {
	perror("getrlimit(RLIMIT_NOFILE) failed");
	exit(1);
    }

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    if (param.no_files != -1)
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    {
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	if ((rlim_t)param.no_files > rlim.rlim_max)
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	{
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	    fprintf(stderr, "attempt to raise open files from %ld to %ld, "
		    "but only %ld is allowed\n",
		    (long)rlim.rlim_cur, (long)param.no_files,
		    (long)rlim.rlim_max);
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	    rlim.rlim_cur = rlim.rlim_max;
	}
	else
	    rlim.rlim_cur = param.no_files;
	
	if (setrlimit(RLIMIT_NOFILE, &rlim) < 0)
	{
	    perror("setrlimit failed");
	    exit(1);
	}
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	if (getrlimit(RLIMIT_NOFILE, &rlim) < 0)
	{
	    perror("getrlimit(RLIMIT_NOFILE) failed");
	    exit(1);
	}
	if (rlim.rlim_cur != (rlim_t)param.no_files)
	    restart_kom("getrlimit after setrlimit returns %ld, not %ld.\n",
			(long)rlim.rlim_cur, (long)param.no_files);
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    }
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    fd_ceiling = rlim.rlim_cur;
#elif HAVE_GETDTABLESIZE
    if (param.no_files == -1)
	fd_ceiling = getdtablesize();
    else if (param.no_files >= getdtablesize())
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    {
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	fprintf(stderr, "getdtablesize() indicates that at most %ld files"
		" can be used.\n", (long)getdtablesize());
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	exit(1);
    }
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    else
	fd_ceiling = param.no_files;
#elif defined(OPEN_MAX)
    if (param.no_files == -1)
	fd_ceiling = OPEN_MAX;
    else if (param.no_files >= OPEN_MAX)
    {
	fprintf(stderr, "OPEN_MAX indicates that at most %ld files"
		" can be used.\n", (long)OPEN_MAX);
	exit(1);
    }
    else
	fd_ceiling = param.no_files;
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#else
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#  error Do not know how to find maximum number of open files.
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#endif

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    if (fd_ceiling > FD_SETSIZE)
	fd_ceiling = FD_SETSIZE;

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    go_daemon();
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    if (lock_db() < 0)
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    {
	/* Don't actually die until something is entered on stdin in debug
	   mode.  This is mainly here for the benefit of the test suite,
	   but is could also be useful to be able to attach a debugger and
	   do pre-mortem debugging of the process at this point.  */
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	kom_log("Cannot obtain database lock.  Exiting.\n");
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	if (foreground)
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	{
	    kom_log("Press enter to terminate lyskomd\n");
	    getchar();
	}

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	exit(1);
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    }

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    server_init(param.ip_client_host, param.ip_client_port);
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    init_data_base();
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}

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/* Stop complaint from gcc 2.0 about "no previous prototype for `main'". */
int main(int argc, char **argv);

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int
main (int    argc,
      char **argv)
{
    int i;
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    char *default_config_file;
    char *config_file;
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    oop_source *src;
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    link_ansi();

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    if (gettimeofday(&current_time, NULL) < 0)
	restart_kom("gettimeofday failed: %s\n", strerror(errno));
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#ifdef TRACED_ALLOCATIONS
    /* We must do this before we allocate any memory... */
    {
      char buf[1024];
      char *nl;

      fputs("Where does the trace want to go today? [stderr]\n", stdout);
      fflush(stdout);
      if (fgets(buf, sizeof(buf), stdin) != buf)
	  restart_kom("main(): unable to read trace location\n");
      if ((nl = strchr(buf, '\n')) != NULL)
	  *nl = '\0';
      trace_alloc_file(buf);
    }
#endif

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    kom_log("*** Version %s (process %lu) started.\n",
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	kom_version_info.server_version, (unsigned long)getpid());
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#ifdef DEBUG_CALLS
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    kom_log("WARNING: This server was compiled with --with-debug-calls.\n");
    kom_log("It isn't safe to use in a production environment.\n");
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#endif
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#ifdef ENCRYPT_PASSWORDS
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    /* Seed the random number generator. */
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    /* FIXME (bug 1068): This is not a good way to seed it... */
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    srand(time(NULL) + getpid());
#endif
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    /* Initialize the string handling package. */
    s_set_storage_management(string_malloc, string_realloc, string_free);
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    /* Parse command line arguments. */
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    for (i = 1; i < argc && argv[i][0] == '-'; i++)
	switch (argv[i][1])
	{
	case 'd':
	    buglevel++;
	    break;

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	case 'f':
	    foreground = 1;
	    break;

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	default:
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	    restart_kom("usage: %s [-f] [-d ...] [config-file]\n", argv[0]);
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	}
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    /* Read in the configuration file. */
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    default_config_file = smalloc(strlen(DEFAULT_DBASE_DIR) +
				  strlen(CONFIG_FILE) + 2);
    sprintf(default_config_file, "%s/%s", DEFAULT_DBASE_DIR, CONFIG_FILE);
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    if (i < argc)
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	config_file = argv[i++];
    else
	config_file = default_config_file;
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    if (i < argc)
	    restart_kom("usage: %s [-d ...] [config-file]\n", argv[0]);
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    init_stats();
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    initialize(config_file);	/* Read config, listen, and start db */
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    chdir(param.core_dir);
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    read_config_file = smalloc(strlen(config_file) + 1);
    strcpy(read_config_file, config_file);
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    sfree(default_config_file);

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    save_pid();
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    check_all_stats("init");
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    toploop();
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    /* There is no use sending logout messages to all sessions. */
    param.send_async_messages = FALSE;
    
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    logout_all_clients();
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    isc_shutdown(kom_server_mcb);
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    cache_sync_all();
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    unlock_db();
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    src = oop_signal_source(kom_signal_adapter);
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    src->cancel_signal(src, SIGWINCH, sighandler_winch, NULL);
    src->cancel_signal(src, SIGUSR2, sighandler_usr2, NULL);
    src->cancel_signal(src, SIGUSR1, sighandler_usr1, NULL);
    src->cancel_signal(src, SIGQUIT, sighandler_quit, NULL);
    src->cancel_signal(src, SIGHUP, sighandler_hup, NULL);
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    oop_signal_delete(kom_signal_adapter);
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    oop_sys_delete(kom_server_oop_src);
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    /* Finish */

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    dump_exit_statistics();
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    check_all_stats("shutdown");
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    kom_log("%s terminated normally.\n", argv[0]);
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    /* Don't actually die until something is entered on stdin in debug
       mode.  This is mainly here for the benefit of the test suite,
       but is could also be useful to be able to attach a debugger and
       do pre-mortem debugging of the process at this point.  */
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    if (foreground)
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    {
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	kom_log("Press enter to terminate lyskomd\n");
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	getchar();
    }
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    exit(0);
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}

static void 
dump_exit_statistics(void)
{
    FILE *stat_file;
    time_t now;

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    time(&now);
    stat_file = i_fopen(param.memuse_name, "a");
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    if ( stat_file == NULL )
	restart_kom("Can't open file to save memory usage to.\n");

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    fprintf(stat_file, "\nLysKOM Server going down at %s\n", ctime(&now));

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    dump_cache_stats (stat_file);

    free_all_tmp();
    free_all_cache();
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    free_all_jubel();
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    free_kom_info();
    free_aux_item_definitions();
    free_configuration();
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    sfree(read_config_file);
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    dump_smalloc_counts(stat_file);
    dump_alloc_counts(stat_file);
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    dump_cache_mem_usage(stat_file);
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    dump_string_alloc_counts(stat_file);
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    dump_allocated_connections(stat_file);
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    dump_isc_alloc_counts(stat_file);
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    dump_oop_alloc_counts(stat_file);
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    dump_l2g_stats(stat_file);
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    i_fclose (stat_file);
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}
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static void
free_kom_info(void)
{
    unsigned long i;

    if (kom_info.aux_item_list.items != NULL)
    {
        for (i = 0; i < kom_info.aux_item_list.length; i++)
        {
            s_clear(&kom_info.aux_item_list.items[i].data);
        }
        sfree(kom_info.aux_item_list.items);
    }
    kom_info.aux_item_list.length = 0;
    kom_info.aux_item_list.items = 0;
}