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rps10.c

/* $Id: rps10.c,v 1.24 2005/04/22 12:23:05 blaschke Exp $ */
/*
 *    Stonith module for WTI Remote Power Controllers (RPS-10M device)
 *
 *      Original code from baytech.c by
 *    Copyright (c) 2000 Alan Robertson <alanr@unix.sh>
 *
 *      Modifications for WTI RPS10
 *    Copyright (c) 2000 Computer Generation Incorporated
 *               Eric Z. Ayers <eric.ayers@compgen.com>
 *
 *    Mangled by Zhaokai <zhaokai@cn.ibm.com>, IBM, 2005
 *
 * 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
 *
 */

#define     DEVICE      "WTI RPS10 Power Switch"
#include "stonith_plugin_common.h"

#include <termios.h>
#define PIL_PLUGIN              rps10
#define PIL_PLUGIN_S            "rps10"
#define PIL_PLUGINLICENSE     LICENSE_LGPL
#define PIL_PLUGINLICENSEURL  URL_LGPL
#define     ST_RPS10          "<serial_device> <node> <outlet> [ <node> <outlet> ]..."
#define MAX_PRSID       256
#include <pils/plugin.h>

static StonithPlugin *  rps10_new(const char *);
static void       rps10_destroy(StonithPlugin *);
static int        rps10_set_config(StonithPlugin *, StonithNVpair *);
static const char**     rps10_get_confignames(StonithPlugin *);
static const char *     rps10_getinfo(StonithPlugin * s, int InfoType);
static int        rps10_status(StonithPlugin * );
static int        rps10_reset_req(StonithPlugin * s, int request, const char * host);
static char **          rps10_hostlist(StonithPlugin  *);

static struct stonith_ops rps10Ops ={
      rps10_new,        /* Create new STONITH object        */
      rps10_destroy,          /* Destroy STONITH object           */
      rps10_getinfo,          /* Return STONITH info string       */
      rps10_get_confignames,  /* Return STONITH info string       */
      rps10_set_config, /* Get configuration from NVpairs   */
      rps10_status,           /* Return STONITH device status           */
      rps10_reset_req,  /* Request a reset                  */
      rps10_hostlist,         /* Return list of supported hosts   */
};

PIL_PLUGIN_BOILERPLATE2("1.0", Debug)
static const PILPluginImports*  PluginImports;
static PILPlugin*               OurPlugin;
static PILInterface*          OurInterface;
static StonithImports*        OurImports;
static void*                  interfprivate;

#include "stonith_signal.h"
#define  DOESNT_USE_STONITHKILLCOMM
#define  DOESNT_USE_STONITHSCANLINE
#include "stonith_expect_helpers.h"

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
      ,     &rps10Ops
      ,     NULL        /*close */
      ,     &OurInterface
      ,     (void*)&OurImports
      ,     &interfprivate); 
}

/*
 *    This was written for a Western Telematic Inc. (WTI) 
 *      Remote Power Switch - RPS-10M. 
 *
 *      It has a DB9 serial port, a Rotary Address Switch,
 *      and a pair of RJ-11 jacks for linking multiple switches 
 *      together.  The 'M' unit is a master unit which can control 
 *      up to 9 additional slave units. (the master unit also has an
 *      A/C outlet, so you can control up to 10 devices)
 *
 *      There are a set of dip switches. The default shipping configuration
 *      is with all dip switches down. I highly recommend that you flip
 *      switch #3 up, so that when the device is plugged in, the power 
 *      to the unit comes on.
 *
 *      The serial interface is fixed at 9600 BPS (well, you *CAN* 
 *        select 2400 BPS with a dip switch, but why?) 8-N-1
 *
 *      The ASCII command string is:
 *
 *      ^B^X^X^B^X^Xac^M
 *      
 *      ^B^X^X^B^X^X  "fixed password" prefix (CTRL-B CTRL-X ... )
 *      ^M            the carriage return character
 *     
 *      a = 0-9  Indicates the address of the module to receive the command
 *      a = *    Sends the command to all modules
 *
 *      c = 0    Switch the AC outlet OFF
 *               Returns:
 *                         Plug 0 Off
 *                         Complete
 *
 *      c = 1    Switch the AC outlet ON
 *               Returns:
 *                        Plug 0 On
 *                        Complete
 *
 *      c = T    Toggle AC OFF (delay) then back ON
 *               Returns:
 *                         Plug 0 Off
 *                         Plug 0 On
 *                         Complete
 *
 *      c = ?    Read and display status of the selected module
 *               Returns:
 *                        Plug 0 On   # or Plug 0 Off
 *                        Complete
 *
 *   e.g. ^B^X^X^B^X^X0T^M toggles the power on plug 0 OFF and then ON
 * 
 *   21 September 2000
 *   Eric Z. Ayers
 *   Computer Generation, Inc.
 */

struct cntrlr_str {
  char outlet_id;       /* value 0-9, '*' */
  char * node;          /* name of the node attached to this outlet */
};

struct pluginDevice {
  StonithPlugin   sp;
  const char *    pluginid;
  const char *    idinfo;

  int       fd;      /* FD open to the serial port */

  char *    device;  /* Serial device name to use to communicate 
                            to this RPS10
                    */

#define WTI_NUM_CONTROLLERS   10
  struct cntrlr_str 
                controllers[WTI_NUM_CONTROLLERS];
            /* one master switch can address 10 controllers */

  /* Number of actually configured units */
  int unit_count;

};

/* This string is used to identify this type of object in the config file */
static const char * pluginid = "WTI_RPS10";
static const char * NOTwtiid = "OBJECT DESTROYED: (WTI RPS-10)";

#include "stonith_config_xml.h"

#define XML_RPS10_SHORTDESC \
      XML_PARM_SHORTDESC_BEGIN("en") \
      ST_RPS10 \
      XML_PARM_SHORTDESC_END

#define XML_RPS10_LONGDESC \
      XML_PARM_LONGDESC_BEGIN("en") \
      "The RPS-10 STONITH device configuration information in the format \"<serial_device> <remotenode> <outlet> [<remotenode> <outlet>]...\"" \
      XML_PARM_LONGDESC_END

#define XML_RPS10_PARM \
      XML_PARAMETER_BEGIN(ST_RPS10, "string") \
        XML_RPS10_SHORTDESC \
        XML_RPS10_LONGDESC \
      XML_PARAMETER_END

static const char *rps10XML = 
  XML_PARAMETERS_BEGIN
    XML_RPS10_PARM
  XML_PARAMETERS_END;

/* WTIpassword - The fixed string ^B^X^X^B^X^X */
static const char WTIpassword[7] = {2,24,24,2,24,24,0}; 

/*
 *    Different expect strings that we get from the WTI_RPS10
 *    Remote Power Controllers...
 */

static struct Etoken WTItokReady[] =      { {"RPS-10 Ready", 0, 0}, {NULL,0,0}};
static struct Etoken WTItokComplete[] =   { {"Complete", 0, 0} ,{NULL,0,0}};
static struct Etoken WTItokPlug[] = { {"Plug", 0, 0}, {NULL,0,0}};
static struct Etoken WTItokOutlet[] =     { {"0", 0, 0}, 
                                {"1", 0, 0}, 
                                {"2", 0, 0}, 
                                {"3", 0, 0}, 
                                {"4", 0, 0}, 
                                {"5", 0, 0}, 
                                {"6", 0, 0}, 
                                {"7", 0, 0}, 
                                {"8", 0, 0}, 
                                {"9", 0, 0}, 
                                {NULL,0,0}};

static struct Etoken WTItokOff[] =  { {"Off", 0, 0}, {NULL,0,0}};

/* 
 * Tokens currently not used because they don't show up on all RPS10 units:
 *
 */
static struct Etoken WTItokOn[] =   { {"On", 0, 0}, {NULL,0,0}};

/* Accept either a CR/NL or an NL/CR */
static struct Etoken WTItokCRNL[] = { {"\n\r",0,0},{"\r\n",0,0},{NULL,0,0}};

static int  RPSConnect(struct pluginDevice * ctx);
static int  RPSDisconnect(struct pluginDevice * ctx);

static int  RPSReset(struct pluginDevice*, char unit_id, const char * rebootid);
#if defined(ST_POWERON) 
static int  RPSOn(struct pluginDevice*, char unit_id, const char * rebootid);
#endif
#if defined(ST_POWEROFF) 
static int  RPSOff(struct pluginDevice*, char unit_id, const char * rebootid);
#endif
static signed char RPSNametoOutlet ( struct pluginDevice * ctx, const char * host );

static int RPS_parse_config_info(struct pluginDevice* ctx, const char * info);

#define        SENDCMD(outlet, cmd, timeout)              {             \
            int ret_val = RPSSendCommand(ctx, outlet, cmd, timeout);\
            if (ret_val != S_OK) {                          \
                  return ret_val;                           \
            }                                         \
      }

/*
 * RPSSendCommand - send a command to the specified outlet
 */
static int
RPSSendCommand (struct pluginDevice *ctx, char outlet, char command, int timeout)
{
      char            writebuf[10]; /* all commands are 9 chars long! */
      int         return_val;  /* system call result */
      fd_set          rfds, wfds, xfds;
      struct timeval    tv;        /*  */

                             /*  list of FDs for select() */
      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      FD_ZERO(&rfds);
      FD_ZERO(&wfds);
      FD_ZERO(&xfds);

      snprintf (writebuf, sizeof(writebuf), "%s%c%c\r",
              WTIpassword, outlet, command);

      if (Debug) {
            LOG(PIL_DEBUG, "Sending %s\n", writebuf);
      }

      /* Make sure the serial port won't block on us. use select()  */
      FD_SET(ctx->fd, &wfds);
      FD_SET(ctx->fd, &xfds);
      
      tv.tv_sec = timeout;
      tv.tv_usec = 0;
      
      return_val = select(ctx->fd+1, NULL, &wfds,&xfds, &tv);
      if (return_val == 0) {
            /* timeout waiting on serial port */
            LOG(PIL_CRIT, "%s: Timeout writing to %s",
                  pluginid, ctx->device);
            return S_TIMEOUT;
      } else if ((return_val == -1) || FD_ISSET(ctx->fd, &xfds)) {
            /* an error occured */
            LOG(PIL_CRIT, "%s: Error before writing to %s: %s",
                  pluginid, ctx->device, strerror(errno));        
            return S_OOPS;
      }

      /* send the command */
      if (write(ctx->fd, writebuf, strlen(writebuf)) != 
                  (int)strlen(writebuf)) {
            LOG(PIL_CRIT, "%s: Error writing to  %s : %s",
                  pluginid, ctx->device, strerror(errno));
            return S_OOPS;
      }

      /* suceeded! */
      return S_OK;

}  /* end RPSSendCommand() */

/* 
 * RPSReset - Reset (power-cycle) the given outlet id 
 */
static int
RPSReset(struct pluginDevice* ctx, char unit_id, const char * rebootid)
{

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      if (ctx->fd < 0) {
            LOG(PIL_CRIT, "%s: device %s is not open!", pluginid, 
                   ctx->device);
            return S_OOPS;
      }

      /* send the "toggle power" command */
      SENDCMD(unit_id, 'T', 10);

      /* Expect "Plug 0 Off" */
      /* Note: If asked to control "*", the RPS10 will report all units it
       * separately; however, we don't know how many, so we can only wait
       * for the first unit to report something and then wait until the
       * "Complete" */
      EXPECT(ctx->fd, WTItokPlug, 5);
      if (Debug) {
            LOG(PIL_DEBUG, "Got Plug\n");
      }
      EXPECT(ctx->fd, WTItokOutlet, 2);
      if (Debug) {
            LOG(PIL_DEBUG, "Got Outlet #\n");
      }
      EXPECT(ctx->fd, WTItokOff, 2);
      if (Debug) {
            LOG(PIL_DEBUG, "Got Off\n");
      }     
      EXPECT(ctx->fd, WTItokCRNL, 2);
      LOG(PIL_INFO, "Host is being rebooted: %s", rebootid);
      
      /* Expect "Complete" */
      EXPECT(ctx->fd, WTItokComplete, 14);
      if (Debug) {
            LOG(PIL_DEBUG, "Got Complete\n");
      }
      EXPECT(ctx->fd, WTItokCRNL, 2);
      if (Debug) {
            LOG(PIL_DEBUG, "Got NL\n");
      }
      
      return(S_OK);

} /* end RPSReset() */


#if defined(ST_POWERON) 
/* 
 * RPSOn - Turn OFF the given outlet id 
 */
static int
RPSOn(struct pluginDevice* ctx, char unit_id, const char * host)
{
      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      if (ctx->fd < 0) {
            LOG(PIL_CRIT, "%s: device %s is not open!", pluginid, 
                   ctx->device);
            return S_OOPS;
      }

      /* send the "On" command */
      SENDCMD(unit_id, '1', 10);

      /* Expect "Plug 0 On" */
      EXPECT(ctx->fd, WTItokPlug, 5);
      EXPECT(ctx->fd, WTItokOutlet, 2);
      EXPECT(ctx->fd, WTItokOn, 2);
      EXPECT(ctx->fd, WTItokCRNL, 2);
      LOG(PIL_INFO, "Host is being turned on: %s", host);
      
      /* Expect "Complete" */
      EXPECT(ctx->fd, WTItokComplete, 5);
      EXPECT(ctx->fd, WTItokCRNL, 2);

      return(S_OK);

} /* end RPSOn() */
#endif


#if defined(ST_POWEROFF) 
/* 
 * RPSOff - Turn Off the given outlet id 
 */
static int
RPSOff(struct pluginDevice* ctx, char unit_id, const char * host)
{

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }
      
      if (ctx->fd < 0) {
            LOG(PIL_CRIT, "%s: device %s is not open!", pluginid, 
                   ctx->device);
            return S_OOPS;
      }

      /* send the "Off" command */
      SENDCMD(unit_id, '0', 10);

      /* Expect "Plug 0 Off" */
      EXPECT(ctx->fd, WTItokPlug, 5);
      EXPECT(ctx->fd, WTItokOutlet, 2);
      EXPECT(ctx->fd, WTItokOff, 2);
      EXPECT(ctx->fd, WTItokCRNL, 2);
      LOG(PIL_INFO, "Host is being turned on: %s", host);
      
      /* Expect "Complete" */
      EXPECT(ctx->fd, WTItokComplete, 5);
      EXPECT(ctx->fd, WTItokCRNL, 2);

      return(S_OK);

} /* end RPSOff() */
#endif


/*
 * rps10_status - API entry point to probe the status of the stonith device 
 *           (basically just "is it reachable and functional?", not the
 *            status of the individual outlets)
 * 
 * Returns:
 *    S_OOPS - some error occured
 *    S_OK   - if the stonith device is reachable and online.
 */
static int
rps10_status(StonithPlugin  *s)
{
      struct pluginDevice*    ctx;
      
      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }
      
      ERRIFNOTCONFIGED(s,S_OOPS);

      ctx = (struct pluginDevice*) s;
      if (RPSConnect(ctx) != S_OK) {
            return(S_OOPS);
      }

      /* The "connect" really does enough work to see if the 
         controller is alive...  It verifies that it is returning 
         RPS-10 Ready 
      */

      return(RPSDisconnect(ctx));
}

/*
 * rps10_hostlist - API entry point to return the list of hosts 
 *                 for the devices on this WTI_RPS10 unit
 * 
 *               This type of device is configured from the config file,
 *                 so we don't actually have to connect to figure this
 *                 out, just peruse the 'ctx' structure.
 * Returns:
 *     NULL on error
 *     a malloced array, terminated with a NULL,
 *         of null-terminated malloc'ed strings.
 */
static char **
rps10_hostlist(StonithPlugin  *s)
{
      char **           ret = NULL; /* list to return */
      int         i;
      int         j;
      struct pluginDevice*    ctx;

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      ERRIFNOTCONFIGED(s,NULL);

      ctx = (struct pluginDevice*) s;

      if (ctx->unit_count >= 1) {
            ret = (char **)MALLOC((ctx->unit_count+1)*sizeof(char*));
            if (ret == NULL) {
                  LOG(PIL_CRIT, "out of memory");
                  return ret;
            }
            ret[ctx->unit_count]=NULL; /* null terminate the array */
            for (i=0; i < ctx->unit_count; i++) {
                  ret[i] = STRDUP(ctx->controllers[i].node);
                  if (ret[i] == NULL) {
                        for(j=0; j<i; j++) {
                              FREE(ret[j]);
                        }
                        FREE(ret); ret = NULL;
                        break;
                  }
            } /* end for each possible outlet */
      } /* end if any outlets are configured */
      return(ret);
} /* end si_hostlist() */

/*
 *    Parse the given configuration information, and stash
 *      it away...
 *
 *         The format of <info> for this module is:
 *            <serial device> <remotenode> <outlet> [<remotenode> <outlet>] ...
 *
 *      e.g. A machine named 'nodea' can kill a machine named 'nodeb' through
 *           a device attached to serial port /dev/ttyS0.
 *           A machine named 'nodeb' can kill machines 'nodea' and 'nodec'
 *           through a device attached to serial port /dev/ttyS1 (outlets 0 
 *             and 1 respectively)
 *
 *      <assuming this is the heartbeat configuration syntax:>
 * 
 *      stonith nodea rps10 /dev/ttyS0 nodeb 0 
 *      stonith nodeb rps10 /dev/ttyS0 nodea 0 nodec 1
 *
 *      Another possible configuration is for 2 stonith devices
 *         accessible through 2 different serial ports on nodeb:
 *
 *      stonith nodeb rps10 /dev/ttyS0 nodea 0 
 *      stonith nodeb rps10 /dev/ttyS1 nodec 0
 */

/*
 *    OOPS!
 *
 *    Most of the large block of comments above is incorrect as far as this
 *    module is concerned.  It is somewhat applicable to the heartbeat code,
 *    but not to this Stonith module.
 *
 *    The format of parameter string for this module is:
 *            <serial device> <remotenode> <outlet> [<remotenode> <outlet>] ...
 */

static int
RPS_parse_config_info(struct pluginDevice* ctx, const char * info)
{
      char *copy;
      char *token;
      char *outlet, *node;

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      /* strtok() is nice to use to parse a string with 
         (other than it isn't threadsafe), but it is destructive, so
         we're going to alloc our own private little copy for the
         duration of this function.
      */

      copy = STRDUP(info);
      if (!copy) {
            LOG(PIL_CRIT, "out of memory");
            return S_OOPS;
      }

      /* Grab the serial device */
      token = strtok (copy, " \t");

      if (!token) {
            LOG(PIL_CRIT, "%s: Can't find serial device on config line '%s'",
                   pluginid, info);
            goto token_error;       
      }

      ctx->device = STRDUP(token);
      if (!ctx->device) {
            LOG(PIL_CRIT, "out of memory");
            goto token_error;
      }

      /* Loop through the rest of the command line which should consist of */
      /* <nodename> <outlet> pairs */
      while ((node = strtok (NULL, " \t"))
             && (outlet = strtok (NULL, " \t\n"))) {
            char outlet_id;

            /* validate the outlet token */
            if ((sscanf (outlet, "%c", &outlet_id) != 1)
                || !( ((outlet_id >= '0') && (outlet_id <= '9'))
                  || (outlet_id == '*') || (outlet_id == 'A') )
               ) {
                  LOG(PIL_CRIT
                  , "%s: the outlet_id %s must be between"
                  " 0 and 9 or '*' / 'A'",
                         pluginid, outlet);
                  goto token_error;
            }
            
            if (outlet_id == 'A') {
                  /* Remap 'A' to '*'; in some configurations,
                   * a '*' can't be configured because it breaks
                   * scripts -- lmb */
                  outlet_id = '*';
            }
            
            if (ctx->unit_count >= WTI_NUM_CONTROLLERS) {
                  LOG(PIL_CRIT, 
                        "%s: Tried to configure too many controllers",
                        pluginid);
                  goto token_error;
            }
            
            ctx->controllers[ctx->unit_count].node = STRDUP(node);
            g_strdown(ctx->controllers[ctx->unit_count].node);
            ctx->controllers[ctx->unit_count].outlet_id = outlet_id;
            ctx->unit_count++;

      } 

      /* free our private copy of the string we've been destructively 
       * parsing with strtok()
       */
      FREE(copy);
      return ((ctx->unit_count > 0) ? S_OK : S_BADCONFIG);

token_error:
      FREE(copy);
      if (ctx->device) {
            FREE(ctx->device);
            ctx->device = NULL;
      }
      return(S_BADCONFIG);
}


/* 
 * dtrtoggle - toggle DTR on the serial port
 * 
 * snarfed from minicom, sysdep1.c, a well known POSIX trick.
 *
 */
static void dtrtoggle(int fd) {
      struct termios tty, old;
      int sec = 2;
    
      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }
      
      tcgetattr(fd, &tty);
      tcgetattr(fd, &old);
      cfsetospeed(&tty, B0);
      cfsetispeed(&tty, B0);
      tcsetattr(fd, TCSANOW, &tty);
      if (sec>0) {
            sleep(sec);
            tcsetattr(fd, TCSANOW, &old);
      }
    
      if (Debug) {
            LOG(PIL_DEBUG, "dtrtoggle Complete (%s)\n", pluginid);
      }
}

/*
 * RPSConnect -
 *
 * Connect to the given WTI_RPS10 device.  
 * Side Effects
 *    DTR on the serial port is toggled
 *    ctx->fd now contains a valid file descriptor to the serial port
 *    ??? LOCK THE SERIAL PORT ???
 *  
 * Returns 
 *    S_OK on success
 *    S_OOPS on error
 *    S_TIMEOUT if the device did not respond
 *
 */
static int
RPSConnect(struct pluginDevice * ctx)
{
      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }
        
      /* Open the serial port if it isn't already open */
      if (ctx->fd < 0) {
            struct termios tio;

            if (OurImports->TtyLock(ctx->device) < 0) {
                  LOG(PIL_CRIT, "%s: TtyLock failed.", pluginid);
                  return S_OOPS;
            }

            ctx->fd = open (ctx->device, O_RDWR);
            if (ctx->fd <0) {
                  LOG(PIL_CRIT, "%s: Can't open %s : %s",
                        pluginid, ctx->device, strerror(errno));
                  return S_OOPS;
            }

            /* set the baudrate to 9600 8 - N - 1 */
            memset (&tio, 0, sizeof(tio));

            /* ??? ALAN - the -tradtitional flag on gcc causes the 
               CRTSCTS constant to generate a warning, and warnings 
                   are treated as errors, so I can't set this flag! - EZA ???
               
                   Hmmm. now that I look at the documentation, RTS
               is just wired high on this device! we don't need it.
            */
            /* tio.c_cflag = B9600 | CS8 | CLOCAL | CREAD | CRTSCTS ;*/
            tio.c_cflag = B9600 | CS8 | CLOCAL | CREAD ;
            tio.c_lflag = ICANON;

            if (tcsetattr (ctx->fd, TCSANOW, &tio) < 0) {
                  LOG(PIL_CRIT, "%s: Can't set attributes %s : %s",
                        pluginid, ctx->device, strerror(errno));
                  close (ctx->fd);
                  OurImports->TtyUnlock(ctx->device);
                  ctx->fd=-1;
                  return S_OOPS;
            }
            /* flush all data to and fro the serial port before we start */
            if (tcflush (ctx->fd, TCIOFLUSH) < 0) {
                  LOG(PIL_CRIT, "%s: Can't flush %s : %s",
                        pluginid, ctx->device, strerror(errno));
                  close (ctx->fd);
                  OurImports->TtyUnlock(ctx->device);
                  ctx->fd=-1;
                  return S_OOPS;          
            }
            
      }

      /* Toggle DTR - this 'resets' the controller serial port interface 
           In minicom, try CTRL-A H to hangup and you can see this behavior.
         */
      dtrtoggle(ctx->fd);

      /* Wait for the switch to respond with "RPS-10 Ready".  
         Emperically, this usually takes 5-10 seconds... 
         ... If this fails, this may be a hint that you got
         a broken serial cable, which doesn't connect hardware
         flow control.
      */
      if (Debug) {
            LOG(PIL_DEBUG, "Waiting for READY\n");
      }
      EXPECT(ctx->fd, WTItokReady, 12);
      if (Debug) {
            LOG(PIL_DEBUG, "Got READY\n");
      }
      EXPECT(ctx->fd, WTItokCRNL, 2);
      if (Debug) {
            LOG(PIL_DEBUG, "Got NL\n");
      }

  return(S_OK);
}

static int
RPSDisconnect(struct pluginDevice * ctx)
{

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      if (ctx->fd >= 0) {
            /* Flush the serial port, we don't care what happens to the 
             * characters and failing to do this can cause close to hang.
             */
            tcflush(ctx->fd, TCIOFLUSH);
            close (ctx->fd);
            if (ctx->device != NULL) {
                  OurImports->TtyUnlock(ctx->device);
            }
      }
      ctx->fd = -1;

      return S_OK;
} 

/*
 * RPSNametoOutlet - Map a hostname to an outlet on this stonith device.
 *
 * Returns:
 *     0-9, * on success ( the outlet id on the RPS10 )
 *     -1 on failure (host not found in the config file)
 * 
 */
static signed char
RPSNametoOutlet ( struct pluginDevice * ctx, const char * host )
{
      int i=0;

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      /* scan the controllers[] array to see if this host is there */
      for (i=0;i<ctx->unit_count;i++) {
            /* return the outlet id */
            if ( ctx->controllers[i].node 
                && !strcasecmp(host, ctx->controllers[i].node)) {
                  /* found it! */
                  break;
            }
      }
      
      if (i == ctx->unit_count) {
            return -1;
      } else {
            return ctx->controllers[i].outlet_id;
      }
}


/*
 *    rps10_reset - API call to Reset (reboot) the given host on 
 *          this Stonith device.  This involves toggling the power off 
 *          and then on again, OR just calling the builtin reset command
 *          on the stonith device.
 */
static int
rps10_reset_req(StonithPlugin * s, int request, const char * host)
{
      int   rc = S_OK;
      int   lorc = S_OK;
      signed char outlet_id = -1;
      struct pluginDevice*    ctx;
      
      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      ERRIFNOTCONFIGED(s,S_OOPS);

      ctx = (struct pluginDevice*) s;

      if ((rc = RPSConnect(ctx)) != S_OK) {
            return(rc);
      }

      outlet_id = RPSNametoOutlet(ctx, host);

      if (outlet_id < 0) {
            LOG(PIL_WARN, "%s: %s doesn't control host [%s]"
            ,     pluginid, ctx->device, host );
            RPSDisconnect(ctx);
            return(S_BADHOST);
      }

      switch(request) {

#if defined(ST_POWERON) 
            case ST_POWERON:
                  rc = RPSOn(ctx, outlet_id, host);
                  break;
#endif
#if defined(ST_POWEROFF)
            case ST_POWEROFF:
                  rc = RPSOff(ctx, outlet_id, host);
                  break;
#endif
      case ST_GENERIC_RESET:
            rc = RPSReset(ctx, outlet_id, host);
            break;
      default:
            rc = S_INVAL;
            break;
      }

      lorc = RPSDisconnect(ctx);

      return(rc != S_OK ? rc : lorc);
}

/*
 *    Parse the information in the given string,
 *    and stash it away...
 */
static int
rps10_set_config(StonithPlugin* s, StonithNVpair* list)
{
      struct pluginDevice*    ctx;
      StonithNamesToGet namestocopy [] =
      {     {ST_RPS10,  NULL}
      ,     {NULL,            NULL}
      };
      int rc=0;

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      ERRIFWRONGDEV(s,S_OOPS);

      if (s->isconfigured) {
            /* The module is already configured. */
            return(S_OOPS);
      }

      ctx = (struct pluginDevice*) s;

      if((rc = OurImports->CopyAllValues(namestocopy, list)) != S_OK){
            LOG(PIL_DEBUG , "get all calues failed"); 
            return rc;
      }
      
      rc = RPS_parse_config_info(ctx, namestocopy[0].s_value);    
      FREE(namestocopy[0].s_value);
      return rc;
}

/*
 *  Return the Stonith plugin configuration parameter 
 *
 */
static const char**
rps10_get_confignames(StonithPlugin* p)
{
      static const char *     Rps10Params[] = {ST_RPS10 ,NULL };

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      return Rps10Params;
}

/*
 * rps10_getinfo - API entry point to retrieve something from the handle
 */
static const char *
rps10_getinfo(StonithPlugin * s, int reqtype)
{
      struct pluginDevice* ctx;
      const char *      ret;

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      ERRIFWRONGDEV(s,NULL);

      /*
       *    We look in the ST_TEXTDOMAIN catalog for our messages
       */
      ctx = (struct pluginDevice *)s;

      switch (reqtype) {
            case ST_DEVICEID:
                  ret = ctx->idinfo;
                  break;
            case ST_DEVICENAME:
                  ret = ctx->device;
                  break;
            case ST_DEVICEDESCR:
                  ret = "Western Telematic Inc. (WTI) "
                  "Remote Power Switch - RPS-10M.\n";
                  break;
            case ST_DEVICEURL:
                  ret = "http://www.wti.com/";
                  break;
            case ST_CONF_XML:       /* XML metadata */
                  ret = rps10XML;
                  break;
            default:
                  ret = NULL;
                  break;
      }
      return ret;
}

/*
 * rps10_destroy - API entry point to destroy a WTI_RPS10 Stonith object.
 */
static void
rps10_destroy(StonithPlugin *s)
{
      struct pluginDevice* ctx;
      int i;

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      VOIDERRIFWRONGDEV(s);

      ctx = (struct pluginDevice *)s;

      ctx->pluginid = NOTwtiid;

      /*  close the fd if open and set ctx->fd to invalid */
      RPSDisconnect(ctx);
      
      if (ctx->device != NULL) {
            FREE(ctx->device);
            ctx->device = NULL;
      }
      if (ctx->unit_count > 0) {
            for (i = 0; i < ctx->unit_count; i++) {
                  if (ctx->controllers[i].node != NULL) {
                        FREE(ctx->controllers[i].node);
                        ctx->controllers[i].node = NULL;
                  }
            }
      }
      FREE(ctx);
}

/* 
 * rps10_new - API entry point called to create a new WTI_RPS10 Stonith device
 *          object. 
 */
static StonithPlugin * 
rps10_new(const char *subplugin)
{
      struct pluginDevice*    ctx = MALLOCT(struct pluginDevice);

      if (Debug) {
            LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
      }

      if (ctx == NULL) {
            LOG(PIL_CRIT, "out of memory");
            return(NULL);
      }
      memset(ctx, 0, sizeof(*ctx));
      ctx->pluginid = pluginid;
      ctx->fd = -1;
      ctx->unit_count = 0;
      ctx->device = NULL;
      ctx->idinfo = DEVICE;
      ctx->sp.s_ops = &rps10Ops;

      return &(ctx->sp);
}

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