meatware.c

linux集群服务器软件代码包

/* $Id: meatware.c,v 1.16 2005/01/31 10:06:33 sunjd Exp $ */
/*
 * Stonith module for Human Operator Stonith device
 *
 * Copyright (c) 2001 Gregor Binder <[e-mail]>
 *
 *   This module is largely based on the "NULL Stonith device", written
 *   by Alan Robertson <[e-mail]>, using code by David C. Teigland
 *   <[e-mail]> originally appeared in the GFS stomith
 *   meatware agent.
 *
 * Mangled by Zhaokai <[e-mail]>, 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	"Meatware STONITH device"
#include "stonith_plugin_common.h"

#define PIL_PLUGIN              meatware
#define PIL_PLUGIN_S            "meatware"
#define PIL_PLUGINLICENSE 	LICENSE_LGPL
#define PIL_PLUGINLICENSEURL 	URL_LGPL
#include <pils/plugin.h>

static StonithPlugin *	meatware_new(void);
static void		meatware_destroy(StonithPlugin *);
static int		meatware_set_config(StonithPlugin *, StonithNVpair *);
static const char**	meatware_get_confignames(StonithPlugin *);
static const char *	meatware_getinfo(StonithPlugin * s, int InfoType);
static int		meatware_status(StonithPlugin * );
static int		meatware_reset_req(StonithPlugin * s, int request, const char * host);
static char **		meatware_hostlist(StonithPlugin  *);

static struct stonith_ops meatwareOps ={
	meatware_new,			/* Create new STONITH object		*/
	meatware_destroy,		/* Destroy STONITH object		*/
	meatware_getinfo,		/* Return STONITH info string		*/
	meatware_get_confignames,	/* Return STONITH info string		*/
	meatware_set_config,		/* Get configuration from NVpairs	*/
	meatware_status,		/* Return STONITH device status		*/
	meatware_reset_req,		/* Request a reset 			*/
	meatware_hostlist,		/* Return list of supported hosts 	*/
};
static int WordCount(const char * s);

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

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

/*
 *	Meatware STONITH device.
 */

struct pluginDevice {
	StonithPlugin   sp;
	const char *	pluginid;
	char **		hostlist;
	int		hostcount;
};

static const char * pluginid = "MeatwareDevice-Stonith";
static const char * NOTpluginID = "Hey, dummy this has been destroyed (MeatwareDev)";

static int
meatware_status(StonithPlugin  *s)
{
	ERRIFWRONGDEV(s,S_OOPS);
	return S_OK;
}


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

static char **
meatware_hostlist(StonithPlugin  *s)
{
	int		numnames = 0;
	char **		ret = NULL;
	struct pluginDevice*	nd;
	int		j;

	ERRIFWRONGDEV(s,NULL);
	nd = (struct pluginDevice*) s;
	if (nd->hostcount < 0) {
		LOG(PIL_CRIT
		,	"unconfigured stonith object in Meatware_list_hosts");
		return(NULL);
	}
	numnames = nd->hostcount;

	ret = (char **)MALLOC(numnames*sizeof(char*));
	if (ret == NULL) {
		LOG(PIL_CRIT, "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) {
			stonith_free_hostlist(ret);
			ret = NULL;
			return ret;
		}
	}
	return(ret);
}

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
Meat_parse_config_info(struct pluginDevice* nd, const char * info)
{
	char **			ret;
	int			wc;
	int			numnames;
	const char *		s = info;
	int			j;
	LOG(PIL_INFO , "parse config info info=%s",info);
	if (nd->hostcount >= 0) {
		return(S_OOPS);
	}

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

	ret = (char **)MALLOC(numnames*sizeof(char*));
	if (ret == NULL) {
		LOG(PIL_CRIT, "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) {
				stonith_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);
}


/*
 *	Indicate that host must be power cycled manually.
 */
static int
meatware_reset_req(StonithPlugin * s, int request, const char * host)
{
	int fd, rc;
	const char *	meatpipe_pr = "/tmp/.meatware"; /* if you intend to
							change this, modify
							meatclient.c as well */

	char		line[256], meatpipe[256];
	char		resp_addr[50], resp_mw[50], resp_result[50];
	char *		shost;

	
	ERRIFWRONGDEV(s,S_OOPS);
	
	
	if ((shost = STRDUP(host)) == NULL) {
		LOG(PIL_CRIT, "strdup failed in %s", __FUNCTION__);
		return(S_OOPS);
	}
	
	g_strdown(shost);

	snprintf(meatpipe, 256, "%s.%s", meatpipe_pr, shost);
	umask(0);
	unlink(meatpipe);

	rc = mkfifo(meatpipe, (S_IRUSR | S_IWUSR));

	if (rc < 0) {
		LOG(PIL_CRIT, "cannot create FIFO for Meatware_reset_host");
		rc = S_OOPS;
		goto out;
	}

	LOG(PIL_CRIT, "OPERATOR INTERVENTION REQUIRED to reset %s.", host);
	LOG(PIL_CRIT, "Run \"meatclient -c %s\" AFTER power-cycling the "
	                 "machine.", shost);

	fd = open(meatpipe, O_RDONLY);

	if (fd < 0) {
		LOG(PIL_CRIT, "cannot open FIFO for Meatware_reset_host");
		rc = S_OOPS;
		goto out;
	}

	memset(line, 0, 256);
	rc = read(fd, line, 256);

	if (rc < 0) {
		LOG(PIL_CRIT, "read error on FIFO for Meatware_reset_host");
		rc = S_OOPS;
		goto out;
	}

	memset(resp_mw, 0, 50);
	memset(resp_result, 0, 50);
	memset(resp_addr, 0, 50);

	sscanf(line, "%s %s %s", resp_mw, resp_result, resp_addr);
	g_strdown(resp_addr);

	if (strncmp(resp_mw, "meatware", 8) ||
	    strncmp(resp_result, "reply", 5) ||
	    strncmp(resp_addr, shost, strlen(resp_addr))) {
		LOG(PIL_CRIT, "failed to Meatware-reset node %s", shost);
		rc = S_RESETFAIL;
		goto out;
	}
	else {
		LOG(PIL_INFO, "%s: %s", _("node Meatware-reset."), shost);
		unlink(meatpipe);
		rc = S_OK;
	}
out:	free(shost);
	return rc;
}

/*
 *	Parse the information in the given string 
 *	and stash it away...
 */
static int
meatware_set_config(StonithPlugin* s, StonithNVpair *list)
{

	const char*	hlist;

	struct pluginDevice*	nd;

	ERRIFWRONGDEV(s,S_OOPS);
	nd = (struct pluginDevice*) s;
	
	if ((hlist = OurImports->GetValue(list, ST_HOSTLIST)) == NULL) {
		return S_OOPS;
	}
	return (Meat_parse_config_info(nd, hlist));
}

/*
 * Return STONITH config vars
 */
static const char**
meatware_get_confignames(StonithPlugin* p)
{
	static const char *	MeatwareParams[] = {ST_HOSTLIST, NULL };
	return MeatwareParams;
}

/*
 * Return STONITH info string
 */
static const char *
meatware_getinfo(StonithPlugin * s, int reqtype)
{
	struct pluginDevice* nd;
	char *		ret;

	ERRIFWRONGDEV(s,NULL);
	/*
	 *	We look in the ST_TEXTDOMAIN catalog for our messages
	 */
	nd = (struct pluginDevice *)s;

	switch (reqtype) {
		case ST_DEVICEID:
			ret = _("Meatware STONITH device");
			break;
		case ST_DEVICEDESCR:
			ret = _("Human (meatware) intervention STONITH device.\n"
			"This STONITH agent prompts a human to reset a machine.\n"
			"The human tells it when the reset was completed.");
			break;

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

/*
 *	Meat Stonith destructor...
 */
static void
meatware_destroy(StonithPlugin *s)
{
	struct pluginDevice* nd;

	VOIDERRIFWRONGDEV(s);
	nd = (struct pluginDevice *)s;

	nd->pluginid = NOTpluginID;
	if (nd->hostlist) {
		stonith_free_hostlist(nd->hostlist);
		nd->hostlist = NULL;
	}
	nd->hostcount = -1;
	FREE(nd);
}

/* Create a new Meatware Stonith device. */

static StonithPlugin *
meatware_new(void)
{
	struct pluginDevice*	nd = MALLOCT(struct pluginDevice);

	if (nd == NULL) {
		LOG(PIL_CRIT, "out of memory");
		return(NULL);
	}
	memset(nd, 0, sizeof(*nd));
	nd->pluginid = pluginid;
	nd->hostlist = NULL;
	nd->hostcount = -1;
	nd->sp.s_ops = &meatwareOps;

	return &(nd->sp);
}