restart.c   [plain text]

/* $Xorg: restart.c,v 1.5 2001/02/09 02:06:01 xorgcvs Exp $ */
/******************************************************************************

Copyright 1993, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
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The above copyright notice and this permission notice shall be included in
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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in this Software without prior written authorization from The Open Group.
******************************************************************************/
/* $XFree86: xc/programs/xsm/restart.c,v 1.6 2001/12/14 20:02:26 dawes Exp $ */

#include "xsm.h"
#include "log.h"
#include "restart.h"
#include "saveutil.h"

extern char **environ;


/*
 * Until XSMP provides a better way to know which clients are "managers",
 * we have to hard code the list.
 */

Bool
CheckIsManager(char *program)
{
    return (strcmp (program, "twm") == 0);
}



/*
 * GetRestartInfo() will determine which method should be used to
 * restart a client.
 *
 * 'restart_service_prop' is a property set by the client, or NULL.
 * The format is "remote_start_protocol/remote_start_data".  An
 * example is "rstart-rsh/hostname".  This is a non-standard property,
 * which is the whole reason we need this function in order to determine
 * the restart method.  The proxy uses this property to over-ride the
 * 'client_host_name' from the ICE connection (the proxy is connected to
 * the SM via a local connection, but the proxy may be acting as a proxy
 * for a remote client).
 *
 * 'client_host_name' is the connection info obtained from the ICE
 * connection.  It's format is "transport/host_info".  An example
 * is "tcp/machine:port".
 *
 * If 'restart_service_prop' is NULL, we use 'client_host_name' to
 * determine the restart method.  If the transport is "local", we
 * do a local restart.  Otherwise, we use the default "rstart-rsh" method.
 *
 * If 'restart_service_prop' is non-NULL, we check the remote_start_protocol
 * field.  "local" means a local restart.  Currently, the only remote
 * protocol we recognize is "rstart-rsh".  If the remote protocol is
 * "rstart-rsh" but the hostname in the 'restart_service_prop' matches
 * 'client_host_name', we do a local restart.
 *
 * On return, set the run_local flag, restart_protocol and restart_machine.
 */

void
GetRestartInfo(char *restart_service_prop, char *client_host_name,
    Bool *run_local, char **restart_protocol, char **restart_machine)
{
    char hostnamebuf[80];
    char *temp;

    *run_local = False;
    *restart_protocol = NULL;
    *restart_machine = NULL;

    if (restart_service_prop)
    {
	gethostname (hostnamebuf, sizeof hostnamebuf);

	if ((temp = (char *) strchr (
	    restart_service_prop, '/')) == NULL)
	{
	    *restart_protocol = (char *) XtNewString ("rstart-rsh");
	    *restart_machine = (char *) XtNewString (restart_service_prop);
	}
	else
	{
	    *restart_protocol = (char *) XtNewString (restart_service_prop);
	    (*restart_protocol)[temp - restart_service_prop] = '\0';
	    *restart_machine = (char *) XtNewString (temp + 1);
	}

	if (strcmp (*restart_machine, hostnamebuf) == 0 ||
	    strcmp (*restart_protocol, "local") == 0)
	{
	    *run_local = True;
	}
    }
    else
    {
	if (strncmp (client_host_name, "tcp/", 4) != 0 &&
	    strncmp (client_host_name, "decnet/", 7) != 0)
	{
	    *run_local = True;
	}
	else
	{
	    *restart_protocol = (char *) XtNewString ("rstart-rsh");

	    if ((temp = (char *) strchr (
		client_host_name, '/')) == NULL)
	    {
		*restart_machine = (char *) XtNewString (client_host_name);
	    }
	    else
	    {
		*restart_machine = (char *) XtNewString (temp + 1);
	    }
	}
    }
}



/*
 * Restart clients.  The flag indicates RESTART_MANAGERS or
 * RESTART_REST_OF_CLIENTS.
 */

Status
Restart(int flag)
{
    List 	*cl, *pl, *vl;
    PendingClient *c;
    Prop 	*prop;
    char	*cwd;
    char	*program;
    char	**args;
    char	**env;
    char	**pp;
    int		cnt;
    char	*p;
    char	*restart_service_prop;
    char	*restart_protocol;
    char	*restart_machine;
    Bool	run_local;
    Bool	is_manager;
    Bool	ran_manager = 0;

    for(cl = ListFirst(PendingList); cl; cl = ListNext(cl)) {
	c = (PendingClient *)cl->thing;

	if (verbose) {
	    printf("Restarting id '%s'...\n", c->clientId);
	    printf("Host = %s\n", c->clientHostname);
	}
	cwd = ".";
	env = NULL;
	program=NULL;
	args=NULL;
	restart_service_prop=NULL;

	is_manager = 0;

	for(pl = ListFirst(c->props); pl; pl = ListNext(pl)) {
	    prop = (Prop *)pl->thing;
	    if(!strcmp(prop->name, SmProgram)) {
		vl = ListFirst(prop->values);
		if(vl) program = ((PropValue *)vl->thing)->value;
		if (CheckIsManager (program))
		    is_manager = 1;
	    } else if(!strcmp(prop->name, SmCurrentDirectory)) {
		vl = ListFirst(prop->values);
		if(vl) cwd = ((PropValue *)vl->thing)->value;
	    } else if(!strcmp(prop->name, "_XC_RestartService")) {
		vl = ListFirst(prop->values);
		if(vl) restart_service_prop =
		    ((PropValue *)vl->thing)->value;
	    } else if(!strcmp(prop->name, SmRestartCommand)) {
		cnt = ListCount(prop->values);
		args = (char **)XtMalloc((cnt+1) * sizeof(char *));
		pp = args;
		for(vl = ListFirst(prop->values); vl; vl = ListNext(vl)) {
		    *pp++ = ((PropValue *)vl->thing)->value;
		}
		*pp = NULL;
	    } else if(!strcmp(prop->name, SmEnvironment)) {
		cnt = ListCount(prop->values);
		env = (char **)XtMalloc((cnt+3+1) * sizeof(char *));
		pp = env;
		for(vl = ListFirst(prop->values); vl; vl = ListNext(vl)) {
		    p = ((PropValue *)vl->thing)->value;
		    if((display_env && strbw(p, "DISPLAY="))
		    || (session_env && strbw(p, "SESSION_MANAGER="))
		    || (audio_env && strbw(p, "AUDIOSERVER="))
		        ) continue;
		    *pp++ = p;
		}
		if(display_env) *pp++ = display_env;
		if(session_env) *pp++ = session_env;
		if(audio_env) *pp++ = audio_env;
		*pp = NULL;
	    }
	}

	if(program && args) {
	    char logtext[256];

	    if ((flag == RESTART_MANAGERS && !is_manager) ||
	        (flag == RESTART_REST_OF_CLIENTS && is_manager))
	    {
		if(args) XtFree((char *)args);
		if(env) XtFree((char *)env);
		continue;
	    }

	    if (flag == RESTART_MANAGERS && is_manager)
		ran_manager = 1;

	    if (verbose) {
		printf("\t%s\n", program);
		printf("\t");
		for(pp = args; *pp; pp++) printf("%s ", *pp);
		printf("\n");
	    }

	    GetRestartInfo (restart_service_prop, c->clientHostname,
    		&run_local, &restart_protocol, &restart_machine);

	    if (run_local)
	    {
		/*
		 * The client is being restarted on the local machine.
		 */

		sprintf (logtext, "Restarting locally : ");
		for (pp = args; *pp; pp++)
		{
		    strcat (logtext, *pp);
		    strcat (logtext, " ");
		}

		strcat (logtext, "\n");
		add_log_text (logtext);

		switch(fork()) {
		case -1:
		    sprintf (logtext,
			"%s: Can't fork() %s", Argv[0], program);
		    add_log_text (logtext);
		    perror (logtext);
		    break;
		case 0:		/* kid */
		    chdir(cwd);
		    if(env) environ = env;
		    execvp(program, args);
		    sprintf (logtext, "%s: Can't execvp() %s",
			Argv[0], program);
		    perror (logtext);
		    /*
		     * TODO : We would like to send this log information to the
		     * log window in the parent.  This would require opening
		     * a pipe between the parent and child.  The child would
		     * set close-on-exec.  If the exec succeeds, the pipe will
		     * be closed.  If it fails, the child can write a message
		     * to the parent.
		     */
		    _exit(255);
		default:	/* parent */
		    break;
		}
	    }
	    else if (!remote_allowed)
	    {
		fprintf(stderr,
		   "Can't remote start client ID '%s': only local supported\n",
			c->clientId);
	    }
	    else
	    {
		/*
		 * The client is being restarted on a remote machine.
		 */

		sprintf (logtext, "Restarting remotely on %s : ",
		    restart_machine);
		for (pp = args; *pp; pp++)
		{
		    strcat (logtext, *pp);
		    strcat (logtext, " ");
		}
		strcat (logtext, "\n");
		add_log_text (logtext);

		remote_start (restart_protocol, restart_machine,
		    program, args, cwd, env,
		    non_local_display_env, non_local_session_env);
	    }

	    if (restart_protocol)
		XtFree (restart_protocol);

	    if (restart_machine)
		XtFree (restart_machine);

	} else {
	    fprintf(stderr, "Can't restart ID '%s':  no program or no args\n",
		c->clientId);
	}
	if(args) XtFree((char *)args);
	if(env) XtFree((char *)env);
    }

    if (flag == RESTART_MANAGERS && !ran_manager)
	return (0);
    else
	return (1);
}



/*
 * Clone a client
 */

void
Clone(ClientRec *client, Bool useSavedState)
{
    char	*cwd;
    char	*program;
    char	**args;
    char	**env;
    char	**pp;
    char	*p;
    char	*restart_service_prop;
    char	*restart_protocol;
    char	*restart_machine;
    Bool	run_local;
    List	*pl, *pj;

    if (verbose)
    {
	printf ("Cloning id '%s', useSavedState = %d...\n",
		client->clientId, useSavedState);
	printf ("Host = %s\n", client->clientHostname);
    }

    cwd = ".";
    env = NULL;
    program = NULL;
    args = NULL;
    restart_service_prop = NULL;

    for (pl = ListFirst (client->props); pl; pl = ListNext (pl))
    {
	Prop *pprop = (Prop *) pl->thing;
	List *vl = ListFirst (pprop->values);
	PropValue *pval = (PropValue *) vl->thing;

	if (strcmp (pprop->name, SmProgram) == 0)
	    program = (char *) pval->value;
	else if (strcmp (pprop->name, SmCurrentDirectory) == 0)
	    cwd = (char *) pval->value;
	else if (strcmp (pprop->name, "_XC_RestartService") == 0)
	    restart_service_prop = (char *) pval->value;
	else if (
	    (!useSavedState && strcmp (pprop->name, SmCloneCommand) == 0) ||
	    (useSavedState && strcmp (pprop->name, SmRestartCommand) == 0))
	{
	    args = (char **) XtMalloc (
		(ListCount (pprop->values) + 1) * sizeof (char *));

	    pp = args;

	    for (pj = ListFirst (pprop->values); pj; pj = ListNext (pj))
	    {
		pval = (PropValue *) pj->thing;
		*pp++ = (char *) pval->value;
	    }
	    *pp = NULL;
	}
	else if (strcmp (pprop->name, SmEnvironment) == 0)
	{
	    env = (char **) XtMalloc (
		(ListCount (pprop->values) + 3 + 1) * sizeof (char *));
	    pp = env;

	    for (pj = ListFirst (pprop->values); pj; pj = ListNext (pj))
	    {
		pval = (PropValue *) pj->thing;
		p = (char *) pval->value;

		if ((display_env && strbw (p, "DISPLAY="))
	         || (session_env && strbw (p, "SESSION_MANAGER="))
		 || (audio_env && strbw (p, "AUDIOSERVER=")))
		    continue;

		*pp++ = p;
	    }

	    if (display_env)
		*pp++ = display_env;
	    if (session_env)
		*pp++ = session_env;
	    if (audio_env)
		*pp++ = audio_env;

	    *pp = NULL;
	}
    }

    if (program && args)
    {
	if (verbose)
	{
	    printf("\t%s\n", program);
	    printf("\t");
	    for (pp = args; *pp; pp++)
		printf ("%s ", *pp);
	    printf("\n");
	}

	GetRestartInfo (restart_service_prop, client->clientHostname,
    	    &run_local, &restart_protocol, &restart_machine);

	if (run_local)
	{
	    /*
	     * The client is being cloned on the local machine.
	     */

	    char msg[256];

	    switch(fork()) {
	    case -1:
		sprintf (msg, "%s: Can't fork() %s", Argv[0], program);
		add_log_text (msg);
		perror (msg);
		break;
	    case 0:		/* kid */
		chdir(cwd);
		if(env) environ = env;
		execvp(program, args);
		sprintf (msg, "%s: Can't execvp() %s", Argv[0], program);
		perror (msg);
		/*
		 * TODO : We would like to send this log information to the
		 * log window in the parent.  This would require opening
		 * a pipe between the parent and child.  The child would
		 * set close-on-exec.  If the exec succeeds, the pipe will
		 * be closed.  If it fails, the child can write a message
		 * to the parent.
		 */
		_exit(255);
	    default:	/* parent */
		break;
	    }
	}
	else if (!remote_allowed)
	{
	    fprintf(stderr,
		   "Can't remote clone client ID '%s': only local supported\n",
			client->clientId);
	}
	else
	{
	    /*
	     * The client is being cloned on a remote machine.
	     */

	    remote_start (restart_protocol, restart_machine,
		program, args, cwd, env,
		non_local_display_env, non_local_session_env);
	}

	if (restart_protocol)
	    XtFree (restart_protocol);

	if (restart_machine)
	    XtFree (restart_machine);

    }
    else
    {
#ifdef XKB
	XkbStdBell(XtDisplay(topLevel),XtWindow(topLevel),0,XkbBI_Failure);
#else
	XBell (XtDisplay (topLevel), 0);
#endif

	fprintf(stderr, "Can't restart ID '%s':  no program or no args\n",
		client->clientId);
    }

    if (args)
	XtFree ((char *)args);
    if (env)
	XtFree ((char *)env);
}



void
StartDefaultApps (void)
{
    FILE *f;
    char *buf, *p, *home, filename[128];
    int buflen, len;

    /*
     * First try ~/.xsmstartup, then system.xsm
     */

    home = (char *) getenv ("HOME");
    if (!home)
	home = ".";
    sprintf (filename, "%s/.xsmstartup", home);

    f = fopen (filename, "r");

    if (!f)
    {
	f = fopen (SYSTEM_INIT_FILE, "r");
	if (!f)
	{
	    printf ("Could not find default apps file.  Make sure you did\n");
	    printf ("a 'make install' in the xsm build directory.\n");
	    exit (1);
	}
    }

    buf = NULL;
    buflen = 0;

    while (getnextline(&buf, &buflen, f))
    {
	char logtext[256];

	if (buf[0] == '!')
	    continue;		/* a comment */

	if ((p = strchr (buf, '\n')))
	    *p = '\0';

	sprintf (logtext, "Starting locally : %s\n", buf);
	add_log_text (logtext);

	len = strlen (buf);

	buf[len] = '&';
	buf[len+1] = '\0';

	/* let the shell parse the stupid args */

	execute_system_command (buf);
    }

    if (buf)
	free (buf);
}



void
StartNonSessionAwareApps(void)
{
    char logtext[256];
    int i;

    for (i = 0; i < non_session_aware_count; i++)
    {
	/*
	 * Let the shell parse the stupid args.  We need to add an "&"
	 * at the end of the command.  We previously allocated an extra
	 * byte for this.
	 */

	sprintf (logtext, "Restarting locally : %s\n",
	    non_session_aware_clients[i]);
	add_log_text (logtext);

	strcat (non_session_aware_clients[i], "&");
	execute_system_command (non_session_aware_clients[i]);
	free ((char *) non_session_aware_clients[i]);
    }

    if (non_session_aware_clients)
    {
	free ((char *) non_session_aware_clients);
	non_session_aware_clients = NULL;
    }
}