ramkomd.c 12.5 KB
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/*
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 * $Id: ramkomd.c,v 0.67 1998/08/07 23:32:08 ceder Exp $
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 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996  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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static const char *
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rcsid = "$Id: ramkomd.c,v 0.67 1998/08/07 23:32:08 ceder Exp $";
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#include "rcs.h"
USE(rcsid);
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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_STDARG_H
#  include <stdarg.h>
#endif
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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 <time.h>
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#ifdef HAVE_SYS_RESOURCE_H
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#  include <sys/time.h>
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#  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 "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 "isc-malloc.h"
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#include "isc-interface.h"
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#include "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 "internal-services.h"
#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 "unused.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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struct kom_par param;
 
Kom_err		  kom_errno = KOM_NO_ERROR;
unsigned long	  err_stat = 0;


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#ifndef NDEBUG
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int	buglevel = 0;
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#endif
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static IscSession *listen_client = NULL;      /* ISC listen identifier */
static IscSession *listen_mux    = NULL;      /*          -"-          */
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static void dump_exit_statistics(void);
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static void
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server_init (char * client_port, char * mux_port)
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{
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    IscConfig config;
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    IscAddress *isc_adr = NULL;
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#ifdef HAVE_STRUCT_SIGACTION
    struct sigaction act;
#endif

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    /*
    ** Setup some parameters here
    */
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    config.version = 1005;
    config.master.version = 1001;
    config.master.memfn.alloc = &isc_malloc_wrapper;
    config.master.memfn.realloc = &isc_realloc_wrapper;
    config.master.memfn.free = &isc_free_wrapper;
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    config.master.abortfn = NULL; /* Use default abort function. */
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    config.session.version = 1001;
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    config.session.max.msgsize = -1; /* Use default sizes. */
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    config.session.max.queuedsize = -1;
    config.session.max.dequeuelen = -1;
    config.session.max.openretries = -1;
    config.session.max.backlog = -1;
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    kom_server_mcb  = isc_initialize(&config);
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    if ( kom_server_mcb == NULL )
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	restart_kom("server_init: can't isc_initialize()\n");

    listen_client = isc_listentcp(kom_server_mcb, NULL, client_port);
    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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    param.num_ip_client_port = isc_getportnum (isc_adr);
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    isc_freeaddress (isc_adr);
    
    listen_mux = isc_listentcp (kom_server_mcb, NULL, mux_port);
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    if (listen_mux == NULL)
        restart_kom("server_init: can't isc_listentcp(MUX)\n");
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    isc_adr = isc_getladdress (listen_mux);
    if (isc_adr == NULL)
	restart_kom("server_init(): can't isc_getladdress (listen_mux)\n");
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    param.num_ip_mux_port = isc_getportnum (isc_adr);
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    isc_freeaddress (isc_adr);

    log("Listening for clients on %d and muxes on %d.\n",
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	param.num_ip_client_port, param.num_ip_mux_port);
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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;
    act.sa_handler = SIG_IGN;
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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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    log("Database = %s\n",  param.datafile_name);
    log("Backup = %s\n", param.backupfile_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
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sighandler_hup (int UNUSED(sig))
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{
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#ifndef HAVE_STRUCT_SIGACTION
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    signal(SIGHUP, sighandler_hup);
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#endif
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    log ("Signal HUP received. Shutting down server.\n");
    go_and_die = TRUE;
}

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static void
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sighandler_quit (int UNUSED(sig))
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{
    log ("Signal QUIT received - syncing...\n");
    cache_sync_all();
    log ("Dumping core now.\n");
    abort();
}

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static void
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sighandler_usr1 (int UNUSED(sig))
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{
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#ifndef HAVE_STRUCT_SIGACTION
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    signal(SIGUSR1, sighandler_usr1);
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#endif
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    do_sync_db = TRUE;
}

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static void
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sighandler_usr2 (int UNUSED(sig))
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{
    int		  child;

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#ifndef HAVE_STRUCT_SIGACTION
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    signal(SIGUSR2, sighandler_usr2);
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#endif
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    log ("Signal USR2 received - will dump core now.  (Check that child dies.)\n");
    if ((child = fork()) == 0)
    {
	abort();
	log ("Abort() failed!!!");
	exit(1);
    }
    else if (child < 0)
    {
	log ("Couldn't fork.\n");
    }
    else
    {
	wait (NULL);
    }
}

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static void
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save_pid(void)
{
    FILE *fp;

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    if ((fp = 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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    fclose(fp);
}

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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 (buglevel != 0)
    {
	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;
	act.sa_handler = SIG_IGN;

#  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 */
    for (fd = 0; fd < MAX_NO_OF_CONNECTIONS + PROTECTED_FDS; fd++)
	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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    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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#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
    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 defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
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    if (param.no_files != -1)
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    {
	if (getrlimit(RLIMIT_NOFILE, &rlim) < 0)
	{
	    perror("getrlimit(RLIMIT_NOFILE) failed");
	    exit(1);
	}
	if (param.no_files > rlim.rlim_max)
	{
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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);
	}
    }
#else
    if (param.no_files != -1)
    {
	fprintf(stderr,
		"can't alter number of open files in your environment.\n");
	exit(1);
    }
#endif

    /* Find out how many connections we can handle. */
#if defined (HAVE_SYSCONF)
    MAX_NO_OF_CONNECTIONS = sysconf(_SC_OPEN_MAX) - PROTECTED_FDS;
#else
# ifdef HAVE_GETDTABLESIZE
    MAX_NO_OF_CONNECTIONS = getdtablesize() - PROTECTED_FDS;
# else
    /* If we don't have getdtablesize or sysconf, MAX_NO_OF_CONNECTIONS is
       set at compile time. */
# endif
#endif

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    go_daemon();
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    server_init(param.ip_client_port, param.ip_mux_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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#ifdef HAVE_STRUCT_SIGACTION
    struct sigaction act;
#endif
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    log("*** Version %s (process %lu) started.\n",
	kom_version_info.server_version, (unsigned long)getpid());
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#ifdef ENCRYPT_PASSWORDS
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    /* Seed the random number generator. */
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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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	default:
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	    restart_kom("usage: %s [-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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#ifdef HAVE_STRUCT_SIGACTION
    sigemptyset(&act.sa_mask);
    act.sa_flags = 0;

    act.sa_handler = sighandler_hup;
    sigaction(SIGHUP, &act, NULL);

    act.sa_handler = sighandler_quit;
    sigaction(SIGQUIT, &act, NULL);

    act.sa_handler = sighandler_usr1;
    sigaction(SIGUSR1, &act, NULL);

    act.sa_handler = sighandler_usr2;
    sigaction(SIGUSR2, &act, NULL);
#else
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    signal(SIGHUP, sighandler_hup);
    signal(SIGQUIT, sighandler_quit);
    signal(SIGUSR1, sighandler_usr1);
    signal(SIGUSR2, sighandler_usr2);
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#endif

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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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    sfree(default_config_file);

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    save_pid();
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    toploop();
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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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    dump_exit_statistics();

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    log("%s terminated normally.\n", argv[0]);
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    return 0;
}

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

    time(&now);
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    stat_file = 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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    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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    fclose (stat_file);
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}