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restart.c

/* $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
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
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in this Software without prior written authorization from The Open Group.
******************************************************************************/
/* $XFree86: xc/programs/xsm/restart.c,v 1.5 2001/01/17 23:46:30 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;
    }
}

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