daemon.c

Pegasus is an open-source implementationof the DMTF CIM and WBEM standards. It is designed to be por

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// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
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// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
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// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
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/*!
  \file daemon.c
  \brief Remote daemon launcher.

  This program is to be run on remote host to enable them for remote
  providers. It loads predefined communication libraries and initializes
  them. Afterwards the remote daemon thread enters the cleanup procedure
  that checks for unused remote providers to be unloaded.


  \sa remote_broker.c
*/

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#ifndef PEGASUS_PLATFORM_ZOS_ZSERIES_IBM
#include <dlfcn.h>
#else
#include <dll.h>
#endif

#include "../native/mm.h"
#include "remote.h"
#include "native.h"
#include "../ip.h"
#include "../io.h"
#include "../tcpcomm.h"
#include "../serialization.h"
#include "debug.h"
#include <Pegasus/Common/Config.h>

typedef int (* START_DAEMON) ();

typedef struct {
	const char * libname;
	void * hLibrary;
	CMPI_THREAD_TYPE thread;
} comm_lib;


//! List of communication libraries to be initialized.
static comm_lib __libs[] = {
	{ "CMPIRTCPCommRemote",0 ,0 },
};

int nativeSide=1;

static const struct BinarySerializerFT *__sft = &binarySerializerFT;

/***************************************************************************/


//! Initializes a remote communication library.
/*!
  Opens the communication library, searches the entry points and executes
  it. The communication layer may then spawn additional listener threads,
  if necessary.

  \param comm pointer to the communication library to be loaded.
 */
static void __init_remote_comm_lib ( comm_lib * comm )
{
	void * hdl = comm->hLibrary = tool_mm_load_lib ( comm->libname );

	if ( hdl ) {
#ifndef PEGASUS_PLATFORM_ZOS_ZSERIES_IBM
		START_DAEMON fp = (START_DAEMON) dlsym ( hdl, "start_remote_daemon" );
#else
		START_DAEMON fp = (START_DAEMON) dllqueryfn ( (dllhandle*) hdl, "start_remote_daemon" );
#endif

		if ( fp ) {
			if ( fp () )
				fprintf ( stderr,
					  "Failed to initialize library." );
			return;
		}
	}
#ifndef PEGASUS_PLATFORM_ZOS_ZSERIES_IBM
	fprintf ( stderr, "%s\n", dlerror () );
#else
	fprintf( stderr, "%s\n", strerror(errno) );
#endif
}

void _usage()
{
    printf ( "Usage: CMPIRDaemon [--foreground | --stop | --help]\n" );
    printf ( "--foreground : Runs the daemon in the foreground.\n");
    printf ( "--stop       : Stops the daemon.\n" );
    printf ( "--help       : Prints this message.\n" );
}

//! Loads all communication libraries.
/*!
  The function initializes the de-/activation context for remote providers,
  then loads all the communication layers. Finally it enters the cleanup
  loop.

  \sa init_activation_context()
  \sa cleanup_remote_brokers()
 */
int main (int argc, char *argv[])
{
	unsigned int i;
        int foreground = 0;
        int unix_platform = 0;
        int daemon_stop = 0;
        char* message_code;
        pid_t pid, sid;
        int socket;

        if (argc > 2)
        {
            _usage();
            return 0;
        }
        if (argc == 2)
        {
            if (!strcmp (argv[1], "--foreground" ))
            {
                foreground = 1;
            }
            else if (!strcmp (argv[1], "--stop" ))
            {
                daemon_stop = 1;
            }
            else
            {
                _usage();
                return 0;
            }
        }
        // "tickle" the connection.
        socket = open_connection ( "127.0.0.1", REMOTE_LISTEN_PORT,
                                   PEGASUS_SUPPRESS_ERROR_MESSAGE);
        if (socket >= 0)
        {
            if( daemon_stop)
            {
                message_code = PEGASUS_CMPIR_DAEMON_STOP;
                printf ("CMPIRDaemon stopped.\n");
            }
            else
            {
                message_code = PEGASUS_CMPIR_DAEMON_IS_RUNNING;
                printf ("CMPIRDaemon is already started.\n");
            }
            __sft->serialize_string (socket, message_code );
            close (socket);
            return 0;
        }
        else if (daemon_stop)
        {
                printf ("CMPIRDaemon is not running.\n");
                return 0;
        }

        // Start daemon on unix platforms
        if (!foreground)
        {
#if defined(PEGASUS_OS_TYPE_UNIX)
            unix_platform = 1;
            pid = fork ();
            if (pid > 0)
            {
                exit(0); // Parent, die now...
            }
            if (pid < 0 || setsid() < 0 || chdir("/") < 0)
            {
                printf ("CMPIRDaemon: Can't run as daemon.\n");
                return -1;
            }
            printf ("CMPIRDaemon started.\n");
            /* Close out the standard file descriptors */
            close (STDIN_FILENO);
            close (STDOUT_FILENO);
            close (STDERR_FILENO);
#endif
        }
        if (!unix_platform && !foreground)
        {
            printf ("Daemon is supported only on UNIX platforms, running in foreground.\n" );
        }
	CMPIContext * ctx = native_new_CMPIContext ( TOOL_MM_NO_ADD );

	init_activation_context ( ctx );

	for ( i = 0;
	      i < sizeof ( __libs ) / sizeof ( comm_lib );
	      i++ ) {

		__init_remote_comm_lib ( __libs + i );
	}
        if (foreground || !unix_platform)
        {
	    TRACE_NORMAL(("All remote daemons started.\n"));
	    TRACE_NORMAL(("Entering provider cleanup loop ...\n"));
        }
	cleanup_remote_brokers ( 100, 30 );
	return 0;
}

/*** Local Variables:  ***/
/*** mode: C           ***/
/*** c-basic-offset: 8 ***/
/*** End:              ***/