wti_nps.c

linux集群服务器软件代码包

/* $Id: wti_nps.c,v 1.21 2005/02/18 07:32:09 zhaokai Exp $ */
/*
 *
 *  Copyright 2001 Mission Critical Linux, Inc.
 *
 *  All Rights Reserved.
 */
/*
 *	Stonith module for WTI Network Power Switch Devices (NPS-xxx)
 *	Also supports the WTI Telnet Power Switch Devices (TPS-xxx)
 *
 *  Copyright 2001 Mission Critical Linux, Inc.
 *  author: mike ledoux <[e-mail]>
 *  author: Todd Wheeling <[e-mail]>
 *  Mangled by Zhaokai <[e-mail]>, IBM, 2005
 *
 *  Based strongly on original code from baytech.c by Alan Robertson.
 *
 * 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
 *
 */

/*                          Observations/Notes
 * 
 * 1. The WTI Network Power Switch, unlike the BayTech network power switch,
 *    accpets only one (telnet) connection/session at a time. When one
 *    session is active, any subsequent attempt to connect to the NPS will
 *    result in a connection refused/closed failure. In a cluster environment
 *    or other environment utilizing polling/monitoring of the NPS
 *    (from multiple nodes), this can clearly cause problems. Obviously the
 *    more nodes and the shorter the polling interval, the more frequently such
 *    errors/collisions may occur.
 *
 * 2. We observed that on busy networks where there may be high occurances
 *    of broadcasts, the NPS became unresponsive.  In some 
 *    configurations this necessitated placing the power switch onto a 
 *    private subnet.
 */

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

#define PIL_PLUGIN              wti_nps
#define PIL_PLUGIN_S            "wti_nps"
#define PIL_PLUGINLICENSE 	LICENSE_LGPL
#define PIL_PLUGINLICENSEURL 	URL_LGPL
#define MAX_WTIPLUGINID		256

#include <pils/plugin.h>

#include "stonith_signal.h"

static StonithPlugin *	wti_nps_new(void);
static void		wti_nps_destroy(StonithPlugin *);
static const char**	wti_nps_get_confignames(StonithPlugin *);
static int		wti_nps_set_config(StonithPlugin * , StonithNVpair * );
static const char *	wti_nps_get_info(StonithPlugin * s, int InfoType);
static int		wti_nps_status(StonithPlugin * );
static int		wti_nps_reset_req(StonithPlugin * s, int request, const char * host);
static char **		wti_nps_hostlist(StonithPlugin  *);

static struct stonith_ops wti_npsOps ={
	wti_nps_new,			/* Create new STONITH object		*/
	wti_nps_destroy,		/* Destroy STONITH object		*/
	wti_nps_get_info,		/* Return STONITH info string		*/
	wti_nps_get_confignames,	/* Return configration parameters	*/
	wti_nps_set_config,		/* set configration			*/
	wti_nps_status,			/* Return STONITH device status		*/
	wti_nps_reset_req,		/* Request a reset 			*/
	wti_nps_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_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
	,	&wti_npsOps
	,	NULL		/*close */
	,	&OurInterface
	,	(void*)&OurImports
	,	&interfprivate); 
}

/*
 *	I have a NPS-110.  This code has been tested with this switch.
 *	(Tested with NPS-230 and TPS-2 by lmb)
 */

struct pluginDevice {
	StonithPlugin	sp;
	const char *	pluginid;
	char *		idinfo;
	char *		unitid;
	pid_t		pid;
	int		rdfd;
	int		wrfd;
	int		config;
	char *		device;
	char *		passwd;
};

static const char * pluginid = "WTINPS-Stonith";
static const char * NOTnpsid = "Hey, dummy this has been destroyed (WTINPS)";


/*
 *	Different expect strings that we get from the WTI
 *	Network Power Switch
 */

#define WTINPSSTR	" Power Switch"
static struct Etoken EscapeChar[] =	{ {"Escape character is '^]'.", 0, 0}
					,	{NULL,0,0}};
static struct Etoken password[] =	{ {"Password:", 0, 0},
						{NULL,0,0}};
static struct Etoken Prompt[] =	{ {"PS>", 0, 0} ,{NULL,0,0}};
static struct Etoken LoginOK[] =	{ {WTINPSSTR, 0, 0}
                    , {"Invalid password", 1, 0} ,{NULL,0,0}};
static struct Etoken Separator[] =	{ {"-----+", 0, 0} ,{NULL,0,0}};

/* We may get a notice about rebooting, or a request for confirmation */
static struct Etoken Processing[] =	{ {"rocessing - please wait", 0, 0}
				,	{"(Y/N):", 1, 0}
				,	{NULL,0,0}};

static int	NPS_connect_device(struct pluginDevice * nps);
static int	NPSLogin(struct pluginDevice * nps);
static int	NPSNametoOutlet(struct pluginDevice*, const char * name, char **outlets);
static int	NPSReset(struct pluginDevice*, char * outlets, const char * rebootid);
static int	NPSLogout(struct pluginDevice * nps);

static int	NPS_parse_config_info(struct pluginDevice* nps, const char * info);
#if defined(ST_POWERON) && defined(ST_POWEROFF)
static int	NPS_onoff(struct pluginDevice*, const char * outlets, const char * unitid
,		int request);
#endif

/* Attempt to login up to 20 times... */
static int
NPSRobustLogin(struct pluginDevice * nps)
{
	int rc = S_OOPS;
	int j = 0;

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

	for ( ; ; ) {
		if (nps->pid > 0) {
			Stonithkillcomm(&nps->rdfd, &nps->wrfd, &nps->pid);
		}
		if (NPS_connect_device(nps) != S_OK) {	
			Stonithkillcomm(&nps->rdfd, &nps->wrfd, &nps->pid);
		}
		else {
			rc = NPSLogin(nps);
			if (rc == S_OK) { 
				break;
			}
		}
		if ((++j) == 20) { 
			break;
		}
		else {
			sleep(1);
		}
	}

	return rc;
}

/* Login to the WTI Network Power Switch (NPS) */
static int
NPSLogin(struct pluginDevice * nps)
{
	char		IDinfo[128];
	char *		idptr = IDinfo;

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

	/*EXPECT(nps->rdfd, EscapeChar, 10);*/
	if (StonithLookFor(nps->rdfd, EscapeChar, 10) < 0) {
		sleep(1);
		return (errno == ETIMEDOUT ? S_TIMEOUT : S_OOPS);
	}
	/* Look for the unit type info */
	if (EXPECT_TOK(nps->rdfd, password, 2, IDinfo
	,	sizeof(IDinfo), Debug) < 0) {
		LOG(PIL_CRIT, "%s", _("No initial response from " DEVICE "."));
		Stonithkillcomm(&nps->rdfd, &nps->wrfd, &nps->pid);
 		return(errno == ETIMEDOUT ? S_TIMEOUT : S_OOPS);
	}
	idptr += strspn(idptr, WHITESPACE);
	/*
	 * We should be looking at something like this:
	 *	Enter Password: 
	 */

	SEND(nps->wrfd, nps->passwd);
	SEND(nps->wrfd, "\r");
	/* Expect "Network Power Switch vX.YY" */

	switch (StonithLookFor(nps->rdfd, LoginOK, 5)) {

		case 0:	/* Good! */
			LOG(PIL_INFO, "%s", _("Successful login to " DEVICE "."));
			break;

		case 1:	/* Uh-oh - bad password */
			LOG(PIL_CRIT, "%s", _("Invalid password for " DEVICE "."));
			return(S_ACCESS);

		default:
			Stonithkillcomm(&nps->rdfd, &nps->wrfd, &nps->pid);
			return(errno == ETIMEDOUT ? S_TIMEOUT : S_OOPS);
	}
	return(S_OK);
}

/* Log out of the WTI NPS */

static int
NPSLogout(struct pluginDevice* nps)
{
	int	rc;

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

	/* Send "/h" help command and expect back prompt */
	/*
	SEND(nps->wrfd, "/h\r");
	*/
	/* Expect "PS>" */
	rc = StonithLookFor(nps->rdfd, Prompt, 5);

	/* "/x" is Logout, "/x,y" auto-confirms */
	SEND(nps->wrfd, "/x,y\r");

	Stonithkillcomm(&nps->rdfd, &nps->wrfd, &nps->pid);
	return(rc >= 0 ? S_OK : (errno == ETIMEDOUT ? S_TIMEOUT : S_OOPS));
}

/* Reset (power-cycle) the given outlets */
static int
NPSReset(struct pluginDevice* nps, char * outlets, const char * rebootid)
{
	char		unum[32];

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

	/* Send "/h" help command and expect back prompt */
	SEND(nps->wrfd, "/h\r");
	/* Expect "PS>" */
	EXPECT(nps->rdfd, Prompt, 5);
	
	/* Send REBOOT command for given outlets */
	snprintf(unum, sizeof(unum), "/BOOT %s,y\r", outlets);
	SEND(nps->wrfd, unum);
	
	/* Expect "Processing "... or "(Y/N)" (if confirmation turned on) */

	retry:
	switch (StonithLookFor(nps->rdfd, Processing, 5)) {
		case 0: /* Got "Processing" Do nothing */
			break;

		case 1: /* Got that annoying command confirmation :-( */
			SEND(nps->wrfd, "Y\r");
			goto retry;

		default: 
			return(errno == ETIMEDOUT ? S_RESETFAIL : S_OOPS);
	}
	LOG(PIL_INFO, "%s: %s", _("Host is being rebooted"), rebootid);

	/* Expect "PS>" */
	if (StonithLookFor(nps->rdfd, Prompt, 60) < 0) {
		return(errno == ETIMEDOUT ? S_RESETFAIL : S_OOPS);
	}

	/* All Right!  Power is back on.  Life is Good! */

	LOG(PIL_INFO, "%s: %s", _("Power restored to host"), rebootid);
	SEND(nps->wrfd, "/h\r");
	return(S_OK);
}

#if defined(ST_POWERON) && defined(ST_POWEROFF)
static int
NPS_onoff(struct pluginDevice* nps, const char * outlets, const char * unitid, int req)
{
	char		unum[32];

	const char *	onoff = (req == ST_POWERON ? "/On" : "/Off");
	int	rc;

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

	if ((rc = NPSRobustLogin(nps) != S_OK)) {
		LOG(PIL_CRIT, "%s", _("Cannot log into " DEVICE "."));
		return(rc);
	}
       
	/* Send "/h" help command and expect prompt back */
	SEND(nps->wrfd, "/h\r");
	/* Expect "PS>" */
	EXPECT(nps->rdfd, Prompt, 5);

	/* Send ON/OFF command for given outlet */
	snprintf(unum, sizeof(unum), "%s %s,y\r", onoff, outlets);
	SEND(nps->wrfd, unum);

	/* Expect "Processing"... or "(Y/N)" (if confirmation turned on) */

	if (StonithLookFor(nps->rdfd, Processing, 5) == 1) {
		/* They've turned on that annoying command confirmation :-( */
		SEND(nps->wrfd, "Y\r");
	}
	EXPECT(nps->rdfd, Prompt, 60);

	/* All Right!  Command done. Life is Good! */
	LOG(PIL_INFO, "%s %s %s %s", _("Power to NPS outlet(s)"), outlets, _("turned"), onoff);
	return(S_OK);
}
#endif /* defined(ST_POWERON) && defined(ST_POWEROFF) */

/*
 *	Map the given host name into an (AC) Outlet number on the power strip
 */

static int
NPSNametoOutlet(struct pluginDevice* nps, const char * name, char **outlets)
{
  	char	NameMapping[128];
  	int	sockno;
  	char	sockname[32];
        char buf[32];
        int left = 17;
  	int ret = -1;
	
	if (Debug) {
		LOG(PIL_DEBUG, "%s:called.", __FUNCTION__);
	}
        
        if ((*outlets = (char *)MALLOC(left*sizeof(char))) == NULL) {
                LOG(PIL_CRIT, "out of memory");
                return(-1);
        }
	
        strncpy(*outlets, "", left);
        left = left - 1;        /* ensure terminating '\0' */
  	/* Expect "PS>" */
  	EXPECT(nps->rdfd, Prompt, 5);
	
  	/* The status command output contains mapping of hosts to outlets */ 
    	SEND(nps->wrfd, "/s\r");

 	/* Expect: "-----+" so we can skip over it... */
    	EXPECT(nps->rdfd, Separator, 5); 
	
  	do {
  		NameMapping[0] = EOS;
  		SNARF(nps->rdfd, NameMapping, 5);
  		
  		if (sscanf(NameMapping
  		,	"%d | %16c",&sockno, sockname) == 2) {
  
  			char *	last = sockname+16;
  			*last = EOS;
  			--last;
			/* Strip off trailing blanks */
  			for(; last > sockname; --last) {
  				if (*last == ' ') {
  					*last = EOS;
  				}else{
  					break;
  				}
  			}