/*
 *		Common Public License Version 0.5
 *
 *		THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF
 *		THIS COMMON PUBLIC LICENSE ("AGREEMENT"). ANY USE,
 *		REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 *		RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 *		1. DEFINITIONS
 *
 *		"Contribution" means:
 *		      a) in the case of the initial Contributor, the
 *		      initial code and documentation distributed under
 *		      this Agreement, and
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 *		      b) in the case of each subsequent Contributor:
 *		      i) changes to the Program, and
 *		      ii) additions to the Program;
 *
 *		      where such changes and/or additions to the Program
 *		      originate from and are distributed by that
 *		      particular Contributor. A Contribution 'originates'
 *		      from a Contributor if it was added to the Program
 *		      by such Contributor itself or anyone acting on such
 *		      Contributor's behalf. Contributions do not include
 *		      additions to the Program which: (i) are separate
 *		      modules of software distributed in conjunction with
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 *		      (ii) are not derivative works of the Program.
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 *		"Contributor" means any person or entity that distributes
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 *		4. COMMERCIAL DISTRIBUTION
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 *		6. DISCLAIMER OF LIABILITY
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 *		7. GENERAL
 *
 *		If any provision of this Agreement is invalid or
 *		unenforceable under applicable law, it shall not affect
 *		the validity or enforceability of the remainder of the
 *		terms of this Agreement, and without further action by the
 *		parties hereto, such provision shall be reformed to the
 *		minimum extent necessary to make such provision valid and
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 *
 *
 *		If Recipient institutes patent litigation against a
 *		Contributor with respect to a patent applicable to
 *		software (including a cros - claim or counterclaim in a
 *		lawsuit), then any patent licenses granted by that
 *		Contributor to such Recipient under this Agreement shall
 *		terminate as of the date such litigation is filed. In
 *		addition, If Recipient institutes patent litigation
 *		against any entity (including a cros - claim or
 *		counterclaim in a lawsuit) alleging that the Program
 *		itself (excluding combinations of the Program with other
 *		software or hardware) infringes such Recipient's
 *		patent(s), then such Recipient's rights granted under
 *		Section 2(b) shall terminate as of the date such
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 *
 *		All Recipient's rights under this Agreement shall
 *		terminate if it fails to comply with any of the material
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 *		responsibility to serve as the Agreement Steward to a
 *		suitable separate entity. Each new version of the
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 *		The Program (including Contributions) may always be
 *		distributed subject to the version of the Agreement under
 *		which it was received. In addition, after a new version of
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 *		2(a) and 2(b) above, Recipient receives no rights or
 *		licenses to the intellectual property of any Contributor
 *		under this Agreement, whether expressly, by implication,
 *		estoppel or otherwise. All rights in the Program not
 *		expressly granted under this Agreement are reserved.
 *
 *
 *		This Agreement is governed by the laws of the State of New
 *		York and the intellectual property laws of the United
 *		States of America. No party to this Agreement will bring a
 *		legal action under this Agreement more than one year after
 *		the cause of action arose. Each party waives its rights to
 *		a jury trial in any resulting litigation.
 *
 *
 *
 * (C) COPYRIGHT International Business Machines Corp. 2001, 2002
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright 2018 Gary Mills
 */

#include <alloca.h>
#include <libgen.h>
#include <sys/varargs.h>

#include "tpmtok_int.h"

extern  API_Proc_Struct_t  *Anchor;
extern int logging;

void logit(int, char *, ...);
#ifdef DEBUG
static int enabled = 0;
#endif /* DEBUG */

void
loginit()
{
#ifdef DEBUG
	if (!enabled) {
		enabled = 1;
		openlog("tpmtoken", LOG_PID | LOG_NDELAY, LOG_DAEMON);
		(void) setlogmask(LOG_UPTO(LOG_DEBUG));
		logit(LOG_DEBUG, "Logging enabled %d enabled", enabled);
	}
#endif /* DEBUG */
}

void
logterm()
{
#ifdef DEBUG
	closelog();
	enabled = 0;
#endif /* DEBUG */
}

/*ARGSUSED*/
void
logit(int type, char *fmt, ...)
{
#ifdef DEBUG
	va_list pvar;
	char buffer[BUFSIZ];

	if (enabled) {
		if (type <= logging) {
			va_start(pvar, fmt);
			(void) vsnprintf(buffer, sizeof (buffer), fmt, pvar);
			va_end(pvar);
			syslog(type, buffer);
		}
	}
#else
	return;
#endif /* DEBUG */

}

void
AddToSessionList(Session_Struct_t *pSess)
{
	Session_Struct_t *pCur;

	(void) pthread_mutex_lock(&(Anchor->SessListMutex));

	pCur = Anchor->SessListBeg;

	if (! pCur) {
		(void) pthread_mutex_lock(&(Anchor->ProcMutex));
		Anchor->SessListBeg = pSess;
		(void) pthread_mutex_unlock(&(Anchor->ProcMutex));
		pSess->Previous = pSess->Next = NULL;
	} else {
		while (pCur->Next != NULL) {
			pCur = pCur->Next;
		}
		pCur->Next = pSess;
		pSess->Previous = pCur;
		pSess->Next = NULL;
	}

	(void) pthread_mutex_unlock(&(Anchor->SessListMutex));
}

void
RemoveFromSessionList(Session_Struct_t *pSess)
{
	Session_Struct_t *pCur, *pTmp;

	(void) pthread_mutex_lock(&(Anchor->SessListMutex));

	pCur = Anchor->SessListBeg;
	/*
	 * Just in case check that there really is a list although
	 * the call to ValidSession should have caught this already.
	 * But someone may have removed the session already
	 * while we were validating the call.
	 */
	if (pCur) {
		if (pCur == pSess) {
			(void) pthread_mutex_lock(&(Anchor->ProcMutex));
			pTmp = pSess->Next;
			Anchor->SessListBeg = pSess->Next;
			if (pTmp) {
				pTmp->Previous = NULL;
			}
			free(pSess);
			(void) pthread_mutex_unlock(&(Anchor->ProcMutex));
			pCur = NULL;
		} else {
			/*
			 * First check for a Null element then check
			 * next against the desired element.  This will
			 * allow the loop to terminate at the end of
			 * the list even if the desired element is not in
			 * the list (should not happen, but be defensive).
			 */
			while (pCur && pCur->Next != pSess) {
				pCur = pCur->Next;
			}
			/*
			 * We did not hit the end of the list without finding
			 * our element so we can continue to remove it
			 */
			if (pCur != NULL) {
				pTmp = pSess->Next;
				pCur->Next = pTmp;
				if (pTmp) {
					pTmp->Previous = pCur;
				}
				free(pSess);
			}
		}
	}

	(void) pthread_mutex_unlock(&(Anchor->SessListMutex));
}

int
Valid_Session(Session_Struct_t *pSession, ST_SESSION_T *rSession)
{
	int rv = FALSE;
	Session_Struct_t  *cSessionp;

	if (!pSession)
		return (FALSE);

	(void) pthread_mutex_lock(&(Anchor->SessListMutex));

	cSessionp = Anchor->SessListBeg;
	while (cSessionp) {
		if (cSessionp == pSession) {
			rv = TRUE;
			rSession->sessionh = pSession->RealHandle;
			rSession->slotID = pSession->SltId;
			break;
		}
		cSessionp = (Session_Struct_t *)cSessionp->Next;
	}

	(void) pthread_mutex_unlock(&(Anchor->SessListMutex));
	return (rv);
}

int
API_Initialized()
{
	return (Anchor != NULL && global_shm != NULL);
}

void
Terminate_All_Process_Sessions()
{
	CK_RV rv;

	logit(LOG_DEBUG, "Terminate_All_Process_Sessions");

	rv = C_CloseAllSessions(TPM_SLOTID);
	/*
	 * If the return (code is not OK, we are really hosed
	 * since we are terminating the session.
	 * For now we will just log it
	 */
	if (rv != CKR_OK) {
		logit(LOG_DEBUG,
		    "Terminate_All_Process_Sessions RV %x", rv);
	}
}