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null.c

/* $Id: null.c,v 1.8.2.1 2004/04/20 08:50:06 alan Exp $ */
/*
 * Stonith module for NULL Stonith device
 *
 * Copyright (c) 2000 Alan Robertson <alanr@unix.sh>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <portability.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <syslog.h>
#include <libintl.h>
#include <sys/wait.h>
#include <glib.h>

#include <stonith/stonith.h>

#define PIL_PLUGINTYPE          STONITH_TYPE
#define PIL_PLUGINTYPE_S        STONITH_TYPE_S
#define PIL_PLUGIN              null
#define PIL_PLUGIN_S            "null"
#define PIL_PLUGINLICENSE     LICENSE_LGPL
#define PIL_PLUGINLICENSEURL  URL_LGPL
#include <pils/plugin.h>

/*
 * nullclose is called as part of unloading the null STONITH plugin.
 * If there was any global data allocated, or file descriptors opened, etc.
 * which is associated with the plugin, and not a single interface
 * in particular, here's our chance to clean it up.
 */

static void
nullclosepi(PILPlugin*pi)
{
}


/*
 * nullcloseintf called as part of shutting down the null STONITH
 * interface.  If there was any global data allocated, or file descriptors
 * opened, etc.  which is associated with the null implementation,
 * here's our chance to clean it up.
 */
static PIL_rc
nullcloseintf(PILInterface* pi, void* pd)
{
      return PIL_OK;
}

static void *           null_new(void);
static void       null_destroy(Stonith *);
static int        null_set_config_file(Stonith *, const char * cfgname);
static int        null_set_config_info(Stonith *, const char * info);
static const char *     null_getinfo(Stonith * s, int InfoType);
static int        null_status(Stonith * );
static int        null_reset_req(Stonith * s, int request, const char * host);
static char **          null_hostlist(Stonith  *);
static void       null_free_hostlist(char **);

static struct stonith_ops nullOps ={
      null_new,         /* Create new STONITH object  */
      null_destroy,           /* Destroy STONITH object     */
      null_set_config_file,   /* set configuration from file      */
      null_set_config_info,   /* Get configuration from file      */
      null_getinfo,           /* Return STONITH info string */
      null_status,            /* Return STONITH device status     */
      null_reset_req,         /* Request a reset */
      null_hostlist,          /* Return list of supported hosts */
      null_free_hostlist      /* free above list */
};

PIL_PLUGIN_BOILERPLATE("1.0", Debug, nullclosepi);
static const PILPluginImports*  PluginImports;
static PILPlugin*               OurPlugin;
static PILInterface*          OurInterface;
static StonithImports*        OurImports;
static void*                  interfprivate;

#define LOG       PluginImports->log
#define MALLOC          PluginImports->alloc
#define STRDUP    PluginImports->mstrdup
#define FREE            PluginImports->mfree
#define EXPECT_TOK      OurImports->ExpectToken
#define STARTPROC OurImports->StartProcess

PIL_rc
PIL_PLUGIN_INIT(PILPlugin*us, const PILPluginImports* imports);

PIL_rc
PIL_PLUGIN_INIT(PILPlugin*us, const PILPluginImports* imports)
{
      /* Force the compiler to do a little type checking */
      (void)(PILPluginInitFun)PIL_PLUGIN_INIT;

      PluginImports = imports;
      OurPlugin = us;

      /* Register ourself as a plugin */
      imports->register_plugin(us, &OurPIExports);  

      /*  Register our interface implementation */
      return imports->register_interface(us, PIL_PLUGINTYPE_S
      ,     PIL_PLUGIN_S
      ,     &nullOps
      ,     nullcloseintf           /*close */
      ,     &OurInterface
      ,     (void*)&OurImports
      ,     &interfprivate); 
}

#define     DEVICE      "NULL STONITH device"
#define WHITESPACE      " \t\n\r\f"

/*
 *    Null STONITH device.  We are very agreeable, but don't do much :-)
 */

struct NullDevice {
      const char *      NULLid;
      char **           hostlist;
      int         hostcount;
};

static const char * NULLid = "NullDevice-Stonith";
static const char * NOTnullID = "Hey, dummy this has been destroyed (NullDev)";

#define     ISNULLDEV(i)      (((i)!= NULL && (i)->pinfo != NULL) \
      && ((struct NullDevice *)(i->pinfo))->NULLid == NULLid)


#ifndef MALLOCT
#     define     MALLOCT(t)      ((t *)(MALLOC(sizeof(t)))) 
#endif

#define N_(text)  (text)
#define _(text)         dgettext(ST_TEXTDOMAIN, text)


static int
null_status(Stonith  *s)
{

      if (!ISNULLDEV(s)) {
            syslog(LOG_ERR, "invalid argument to NULL_status");
            return(S_OOPS);
      }
      return S_OK;
}


/*
 *    Return the list of hosts configured for this NULL device
 */

static char **
null_hostlist(Stonith  *s)
{
      int         numnames = 0;
      char **           ret = NULL;
      struct NullDevice*      nd;
      int         j;

      if (!ISNULLDEV(s)) {
            syslog(LOG_ERR, "invalid argument to NULL_list_hosts");
            return(NULL);
      }
      nd = (struct NullDevice*) s->pinfo;
      if (nd->hostcount < 0) {
            syslog(LOG_ERR
            ,     "unconfigured stonith object in NULL_list_hosts");
            return(NULL);
      }
      numnames = nd->hostcount;

      ret = (char **)MALLOC(numnames*sizeof(char*));
      if (ret == NULL) {
            syslog(LOG_ERR, "out of memory");
            return ret;
      }

      memset(ret, 0, numnames*sizeof(char*));

      for (j=0; j < numnames-1; ++j) {
            ret[j] = STRDUP(nd->hostlist[j]);
            if (ret[j] == NULL) {
                  null_free_hostlist(ret);
                  ret = NULL;
                  return ret;
            }
      }
      return(ret);
}

static void
null_free_hostlist (char ** hlist)
{
      char **     hl = hlist;
      if (hl == NULL) {
            return;
      }
      while (*hl) {
            FREE(*hl);
            *hl = NULL;
            ++hl;
      }
      FREE(hlist);
      hlist = NULL;
}


static int
WordCount(const char * s)
{
      int   wc = 0;
      if (!s) {
            return wc;
      }
      do {
            s += strspn(s, WHITESPACE);
            if (*s)  {
                  ++wc;
                  s += strcspn(s, WHITESPACE);
            }
      }while (*s);

      return(wc);
}

/*
 *    Parse the config information, and stash it away...
 */

static int
NULL_parse_config_info(struct NullDevice* nd, const char * info)
{
      char **                 ret;
      int               wc;
      int               numnames;
      const char *            s = info;
      int               j;

      if (nd->hostcount >= 0) {
            return(S_OOPS);
      }

      wc = WordCount(info);
      numnames = wc + 1;

      ret = (char **)MALLOC(numnames*sizeof(char*));
      if (ret == NULL) {
            syslog(LOG_ERR, "out of memory");
            return S_OOPS;
      }

      memset(ret, 0, numnames*sizeof(char*));

      for (j=0; j < wc; ++j) {
            s += strspn(s, WHITESPACE);
            if (*s)  {
                  const char *      start = s;
                  s += strcspn(s, WHITESPACE);
                  ret[j] = MALLOC((1+(s-start))*sizeof(char));
                  if (ret[j] == NULL) {
                        null_free_hostlist(ret);
                        ret = NULL;
                        return S_OOPS;
                  }
                  strncpy(ret[j], start, (s-start));
                  g_strdown(ret[j]);
            }
      }
      nd->hostlist = ret;
      nd->hostcount = numnames;
      return(S_OK);
}


/*
 *    Pretend to reset the given host on this Stonith device.
 *    (we don't even error check the "request" type)
 */
static int
null_reset_req(Stonith * s, int request, const char * host)
{

      if (!ISNULLDEV(s)) {
            syslog(LOG_ERR, "invalid argument to %s", __FUNCTION__);
            return(S_OOPS);
      }

      /* Real devices need to pay attention to the "request" */
      /* (but we don't care ;-)) */

      syslog(LOG_INFO, _("Host %s null-reset."), host);
      return S_OK;
}

/*
 *    Parse the information in the given configuration file,
 *    and stash it away...
 */
static int
null_set_config_file(Stonith* s, const char * configname)
{
      FILE *      cfgfile;

      char  NULLline[256];

      struct NullDevice*      nd;

      if (!ISNULLDEV(s)) {
            syslog(LOG_ERR, "invalid argument to NULL_set_configfile");
            return(S_OOPS);
      }
      nd = (struct NullDevice*) s->pinfo;

      if ((cfgfile = fopen(configname, "r")) == NULL)  {
            syslog(LOG_ERR, "Cannot open %s", configname);
            return(S_BADCONFIG);
      }
      while (fgets(NULLline, sizeof(NULLline), cfgfile) != NULL){
            if (*NULLline == '#' || *NULLline == '\n' || *NULLline == EOS) {
                  continue;
            }
            return(NULL_parse_config_info(nd, NULLline));
      }
      return(S_BADCONFIG);
}

/*
 *    Parse the config information in the given string, and stash it away...
 */
static int
null_set_config_info(Stonith* s, const char * info)
{
      struct NullDevice* nd;

      if (!ISNULLDEV(s)) {
            syslog(LOG_ERR, "%s: invalid argument", __FUNCTION__);
            return(S_OOPS);
      }
      nd = (struct NullDevice *)s->pinfo;

      return(NULL_parse_config_info(nd, info));
}

static const char *
null_getinfo(Stonith * s, int reqtype)
{
      struct NullDevice* nd;
      char *            ret;

      if (!ISNULLDEV(s)) {
            syslog(LOG_ERR, "NULL_idinfo: invalid argument");
            return NULL;
      }
      /*
       *    We look in the ST_TEXTDOMAIN catalog for our messages
       */
      nd = (struct NullDevice *)s->pinfo;

      switch (reqtype) {
            case ST_DEVICEID:
                  ret = _("null STONITH device");
                  break;

            case ST_CONF_INFO_SYNTAX:
                  ret = _("hostname ...\n"
                  "host names are white-space delimited.");
                  break;

            case ST_CONF_FILE_SYNTAX:
                  ret = _("hostname ...\n"
                  "host names are white-space delimited.  "
                  "All host names must be on one line.  "
                  "Blank lines and lines beginning with # are ignored");
                  break;

            case ST_DEVICEDESCR:
                  ret = _("Dummy (do-nothing) STONITH device\n"
                  "FOR TESTING ONLY!");
                  break;

            default:
                  ret = NULL;
                  break;
      }
      return ret;
}

/*
 *    NULL Stonith destructor...
 */
static void
null_destroy(Stonith *s)
{
      struct NullDevice* nd;

      if (!ISNULLDEV(s)) {
            syslog(LOG_ERR, "%s: invalid argument", __FUNCTION__);
            return;
      }
      nd = (struct NullDevice *)s->pinfo;

      nd->NULLid = NOTnullID;
      if (nd->hostlist) {
            null_free_hostlist(nd->hostlist);
            nd->hostlist = NULL;
      }
      nd->hostcount = -1;
      FREE(nd);
}

/* Create a new Null Stonith device.  Too bad this function can't be static */
static void *
null_new(void)
{
      struct NullDevice*      nd = MALLOCT(struct NullDevice);

      if (nd == NULL) {
            syslog(LOG_ERR, "out of memory");
            return(NULL);
      }
      memset(nd, 0, sizeof(*nd));
      nd->NULLid = NULLid;
      nd->hostlist = NULL;
      nd->hostcount = -1;
      return((void *)nd);
}

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