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version 3.2

/*************************************************************************
* (C) 2008 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: sess.c,v 1.5 2012/07/22 22:13:48 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"
#include "aitsess.h"


/*
 * sess_FreeValues() Free all values from value array allocated from sess_GetValues()
 *
 * @ppsVals = Array strings
 * return: none
 */
inline void
sess_FreeValues(char *** __restrict ppsVals)
{
	char **ptr;

	assert(ppsVals);
	if (!ppsVals)
		return;

	for (ptr = *ppsVals; *ptr; ptr++)
		io_free(*ptr);
	io_free(*ppsVals);
	*ppsVals = NULL;
}

/*
 * sess_GetValues() Get all values from session shared memory
 *
 * @s = Session item
 * @ppsVals = Return array strings
 * return: -1 error: in parameter, !=-1 count of returned strings in ppsVals (must be free after use!)
 */
int
sess_GetValues(ait_sess_t * __restrict s, char ***ppsVals)
{
	register int i;
	char **valz, *Shared = NULL;
	char *peer, *p_brk;

	if (!s || !ppsVals)
		return -1;
	valz = io_malloc(sizeof(caddr_t));
	if (!valz) {
		LOGERR;
		return -1;
	} else
		*valz = NULL;

	// allocated memory & mirrored shared memory into this
	Shared = io_malloc(s->eom);
	if (!Shared) {
		LOGERR;
		io_free(valz);
		return -1;
	} else
		memcpy(Shared, s->addr, s->eom);

	for (i = 0, peer = strtok_r(Shared, MEM_DELIM"\r\n", &p_brk); peer; 
			peer = strtok_r(NULL, MEM_DELIM"\r\n", &p_brk)) {
		if (!strchr(peer, '='))
			continue;
		else
			i++;

		valz = io_realloc(valz, (i + 1) * sizeof(caddr_t));
		if (!valz) {
			LOGERR;
			io_free(Shared);
			return -1;
		} else
			valz[i] = NULL;

		valz[i - 1] = io_strdup(peer);
	}

	io_free(Shared);
	*ppsVals = valz;
	return i;
}

/*
 * sess_GetValue() Get value from session shared memory from attribute
 *
 * @s = Session item
 * @csAttr = Attribute for search
 * @psVal = Return string buffer
 * @pnLen = Length of return string buffer, 
	// *{pnLen} input is max_size of buffer & output is really taken bytes
 * return: 0 not found, -1 error: in parameter, >0 get position, if define item merged with IS_DEF
 */
int
sess_GetValue(ait_sess_t * __restrict s, const char *csAttr, char *psVal, int *pnLen)
{
	register int i;
	int def = IS_VAL;
	char *Shared = NULL;
	char *peer, *p_brk, *a_brk, *attr, *val;

	if (!s || !csAttr || !*csAttr)
		return -1;
	if (psVal) {
		if (pnLen && *pnLen > 0)
			memset(psVal, 0, *pnLen);
		else
			return -1;
	}

	// allocated memory & mirrored shared memory into this
	Shared = io_malloc(s->eom);
	if (!Shared) {
		LOGERR;
		return -1;
	} else
		memcpy(Shared, s->addr, s->eom);

	for (i = 1, peer = strtok_r(Shared, MEM_DELIM"\r\n", &p_brk); peer; 
			i++, peer = strtok_r(NULL, MEM_DELIM"\r\n", &p_brk)) {
		attr = strtok_r(peer, "=\r\n", &a_brk);
		if (attr && !strncmp(attr, csAttr, MAX_ATTRIBUTE - 1)) {
			val = strtok_r(NULL, "=\r\n", &a_brk);
			if (val && strlen(val)) {
				if (psVal)
					strlcpy(psVal, val, *pnLen);
				if (pnLen)
					*pnLen = strlen(val);
			} else
				def = IS_DEF;

			io_free(Shared);
			return i | def;
		}
	}

	io_free(Shared);
	return 0;
}

/*
 * sess_DelValue() Delete item from session shared memory
 *
 * @s = Session item
 * @csAttr = Attribute for erasing
 * return: 0 Ok, -1 error: in parameter
 */
int
sess_DelValue(ait_sess_t * __restrict s, const char *csAttr)
{
	register int i;
	int attrlen;
	char *Buffer, *Shared, szAttr[MAX_ATTRIBUTE];
	char *peer, *p_brk;

	if (!s || !csAttr || !*csAttr)
		return -1;
	else
		attrlen = strlen(csAttr);
	Buffer = Shared = NULL;
	strlcpy(szAttr, csAttr, sizeof szAttr);
	strlcat(szAttr, "=", sizeof szAttr);

	Buffer = io_malloc(s->eom);
	if (!Buffer) {
		LOGERR;
		return -1;
	} else
		memset(Buffer, 0, s->eom);
	Shared = io_malloc(s->eom);
	if (!Shared) {
		LOGERR;
		io_free(Buffer);
		return -1;
	} else {
		DEC_SEM(s);
		memcpy(Shared, s->addr, s->eom);
	}

	for (i = 1, peer = strtok_r(Shared, MEM_DELIM"\r\n", &p_brk); peer; 
			i++, peer = strtok_r(NULL, MEM_DELIM"\r\n", &p_brk)) {
		if (!strncmp(peer, csAttr, attrlen))
			if (peer[attrlen] == '=' || peer[attrlen] == *MEM_DELIM || !peer[attrlen] ||
					peer[attrlen] == '\r' || peer[attrlen] == '\n')
				continue;

		strlcat(Buffer, peer, s->eom);
		strlcat(Buffer, MEM_DELIM, s->eom);
	}

	memcpy(s->addr, Buffer, s->eom);

	if (s->type == SHARED_MAP)
		msync(s->addr, 0, MS_SYNC | MS_INVALIDATE);

	INC_SEM(s);
	io_free(Shared);
	io_free(Buffer);
	return 0;
}

/*
 * sess_SetValue() Set item into session shared memory or update if find it
 *
 * @s = Session item
 * @csAttr = Attribute
 * @psVal = Value
 * return: 0 nothing, -1 error: in parameter, 
 	>0 set position, if add item merged with IS_ADD and if define item merged with IS_DEF
 */
int
sess_SetValue(ait_sess_t * __restrict s, const char *csAttr, const char *psVal)
{
	register int i;
	int upd, def = IS_VAL;
	char *Buffer, *Shared, szAttr[MAX_ATTRIBUTE];
	char *peer, *p_brk;

	if (!s || !csAttr || !*csAttr)
		return -1;
	else
		Buffer = Shared = NULL;
	strlcpy(szAttr, csAttr, sizeof szAttr);
	strlcat(szAttr, "=", sizeof szAttr);

	Buffer = io_malloc(s->eom);
	if (!Buffer) {
		LOGERR;
		return -1;
	} else
		memset(Buffer, 0, s->eom);
	Shared = io_malloc(s->eom);
	if (!Shared) {
		LOGERR;
		io_free(Buffer);
		return -1;
	} else {
		DEC_SEM(s);
		memcpy(Shared, s->addr, s->eom);
	}

	for (i = 1, upd = 0, peer = strtok_r(Shared, MEM_DELIM"\r\n", &p_brk); peer; 
			i++, peer = strtok_r(NULL, MEM_DELIM"\r\n", &p_brk)) {
		if (!strncmp(peer, szAttr, strlen(szAttr))) {
			upd++;
			if (psVal) {
				strlcat(Buffer, szAttr, s->eom);
				strlcat(Buffer, psVal, s->eom);
				strlcat(Buffer, MEM_DELIM, s->eom);
			} else {
				strlcat(Buffer, csAttr, s->eom);
				strlcat(Buffer, MEM_DELIM, s->eom);
				def = IS_DEF;
			}
			continue;
		}

		strlcat(Buffer, peer, s->eom);
		strlcat(Buffer, MEM_DELIM, s->eom);
	}

	if (!upd) {
		if (psVal) {
			strlcat(Buffer, szAttr, s->eom);
			strlcat(Buffer, psVal, s->eom);
			strlcat(Buffer, MEM_DELIM, s->eom);
		} else {
			strlcat(Buffer, csAttr, s->eom);
			strlcat(Buffer, MEM_DELIM, s->eom);
			def = IS_DEF;
		}
		def |= IS_ADD;
	}

	memcpy(s->addr, Buffer, s->eom);

	if (s->type == SHARED_MAP)
		msync(s->addr, 0, MS_SYNC | MS_INVALIDATE);

	INC_SEM(s);
	io_free(Shared);
	io_free(Buffer);
	return upd | def;
}


/*
 * sess_prepareSession() Attach to shared memory and de-marshaling data
 *
 * @s = Session
 * @useDirect = Use direct shared memory if !=0 or snapshot of data to array
 * return: NULL error or no data, !=NULL array with variables, 
 *		after use must free resources with sess_doneSession()
 */
array_t *
sess_prepareSession(ait_sess_t * __restrict s, char useDirect)
{
	array_t *arr = NULL;
	sess_hdr_t *hdr;

	assert(s);
	if (!s) {
		sess_SetErr(EINVAL, "Error:: invalid argument\n");
		return NULL;
	}
	if (s->addr) {
		sess_SetErr(EINVAL, "Error:: already attached memory\n");
		return NULL;
	}

	ATTACH_MEMORY(s);
	if (!s->addr)
		return NULL;
	else
		hdr = (sess_hdr_t*) s->addr;
	if (hdr->hdr_magic != SESS_AIT_MAGIC) {
		DETACH_MEMORY(s);

		sess_SetErr(EINVAL, "Error:: shared memory not contains values with proper format\n");
		return NULL;
	}

	DEC_SEM(s);
	s->zcpy = useDirect;
	arr = io_map2vars(s->addr + sizeof(sess_hdr_t), s->eom - sizeof(sess_hdr_t), 
			hdr->hdr_argc, useDirect);
	INC_SEM(s);

	if (!s->zcpy)
		DETACH_MEMORY(s);
	return arr;
}

/*
 * sess_doneSession() Free resources allocated with sess_prepareSession()
 *
 * @s = Session
 * @arr = Array with variables for free
 * return: none
 */
void
sess_doneSession(ait_sess_t * __restrict s, array_t ** __restrict arr)
{
	assert(s);
	if (!s) {
		sess_SetErr(EINVAL, "Error:: invalid argument\n");
		return;
	}

	if (!s->zcpy)
		io_arrayFree(*arr);
	else
		DETACH_MEMORY(s);
	io_arrayDestroy(arr);
}

/*
 * sess_commitSession() Commit data to shared memory
 *
 * @s = Session
 * @arr = Array with variables for save
 * return -1 error or !=-1 size of stored variables into shared memory
 */
int
sess_commitSession(ait_sess_t * __restrict s, array_t * __restrict arr)
{
	sess_hdr_t *hdr;
	int ret = 0;

	assert(s && arr);
	if (!s || !arr) {
		sess_SetErr(EINVAL, "Error:: invalid argument\n");
		return -1;
	}

	ATTACH_MEMORY(s);
	if (!s->addr) {
		DETACH_MEMORY(s);
		return -1;
	} else
		hdr = (sess_hdr_t*) s->addr;

	DEC_SEM(s);
	if ((ret = io_vars2map(s->addr + sizeof(sess_hdr_t), s->eom - sizeof(sess_hdr_t), arr)) != -1) {
		hdr->hdr_magic = SESS_AIT_MAGIC;
		hdr->hdr_argc = io_arraySize(arr);
		ret += sizeof(sess_hdr_t);
	}
	INC_SEM(s);

	DETACH_MEMORY(s);
	return ret;
}