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/*************************************************************************
 * (C) 2014 AITNET - Sofia/Bulgaria - <office@aitbg.com>
 *  by Michael Pounov <misho@aitbg.com>
 *
 * $Author: misho $
 * $Id: ub_env.c,v 1.3 2017/06/28 15:19:32 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 - 2017
	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 "ub_env.h"


env_t *env;

static int
ub_flash_io(const char *csSec, int mode)
{
	int f, l, rlen;
	const char *str;
	ssize_t siz, esiz;
	ait_val_t v;
	u_int crc;

	FTRACE(4);

	str = cfg_getAttribute(&cfg, csSec, "drive_size");
	siz = strtol(str, NULL, 0);
	if (!siz)
		return -1;
	str = cfg_getAttribute(&cfg, csSec, "env_size");
	if (!str)
		esiz = siz - sizeof env->env_crc;
	else
		esiz = strtol(str, NULL, 0);
	str = cfg_getAttribute(&cfg, csSec, "drive_name");
	if (!str) {
		printf("Error:: drive not found!\n");
		return -1;
	}

	cfg_loadAttribute(&cfg, "ube", "lock", &v, UBE_LOCK);
	l = open(AIT_GET_STR(&v), O_CREAT | O_EXCL | O_WRONLY, 0644);
	if (l == -1) {
		printf("Error:: Locked u-boot-env map %s\n", AIT_GET_STR(&v));
		AIT_FREE_VAL(&v);
		return -1;
	}

	f = open(str, mode);
	if (f == -1) {
		printf("Error:: Can't access u-boot-env device %s\n", str);
		close(l);
		unlink(AIT_GET_STR(&v));
		AIT_FREE_VAL(&v);
		return -1;
	}

	if (mode & O_RDWR) {
		env->env_crc = crc_32(0, (u_char*) env->env_data, esiz);
		VERB(5) printf("Write CRC32 0x%x\n", env->env_crc);
		rlen = write(f, env, siz);
		if (rlen != siz)
			printf("Error:: written %d bytes != %zd\n", rlen, siz);
		else
			VERB(3) printf("Written %d bytes\n", rlen);
		lseek(f, 0, SEEK_SET);
	}

	rlen = read(f, env, siz);
	if (rlen != siz)
		printf("Error:: readed %d bytes != %zd\n", rlen, siz);
	else
		VERB(3) printf("Readed %d bytes\n", rlen);

	crc = crc_32(0, (u_char*) env->env_data, esiz);
	VERB(5) printf("Calculated CRC32 0x%x\n", crc);
	if (crc != env->env_crc)
		VERB(1) printf("Warning:: Bad CRC, Flash crc32 0x%x != 0x%x\n", 
				env->env_crc, crc);

	close(f);
	close(l);
	unlink(AIT_GET_STR(&v));
	AIT_FREE_VAL(&v);
	return 0;
}

static inline const char *
ub_envmatch(const char *csName, const char *e)
{
	while (*csName == *e++)
		if (*csName++ == '=')
			return e;
	if (!*csName && *(e - 1) == '=')
		return e;

	return NULL;
}

int
ub_load(const char *csSec)
{
	const char *str;
	size_t siz;

	FTRACE(4);

	str = cfg_getAttribute(&cfg, csSec, "drive_size");
	siz = strtol(str, NULL, 0);
	if (!siz)
		return -1;

	env = e_malloc(siz);
	if (!env) {
		ELIBERR(elwix);
		return -1;
	}

	return ub_flash_io(csSec, O_RDONLY);
}

void
ub_unload()
{
	FTRACE(4);

	if (env)
		e_free(env);
}

const char*
ub_getenv(const char *csSec, const char *csName)
{
	char *e, *nxt;
	size_t dlen = 0;
	const char *str = NULL;

	FTRACE(3);

	str = cfg_getAttribute(&cfg, csSec, "env_size");
	if (!str) {
		str = cfg_getAttribute(&cfg, csSec, "drive_size");
		if (!str)
			return NULL;
		dlen -= sizeof env->env_crc;
	}
	dlen += strtol(str, NULL, 0);
	if (!dlen)
		return NULL;
	else
		dlen--;

	for (e = env->env_data; *e; e = nxt + 1) {
		for (nxt = e; *nxt; nxt++)
			if (nxt >= env->env_data + dlen) {
				printf("Error:: environment not terminated\n");
				return NULL;
			}

		str = ub_envmatch(csName, e);
		if (str)
			break;
	}

	return str;
}

int
ub_setenv(const char *csSec, const char *csName, const char *csValue)
{
	char *e, *nxt;
	ssize_t dlen = 0, len;
	const char *str, *old = NULL;

	FTRACE(3);

	str = cfg_getAttribute(&cfg, csSec, "env_size");
	if (!str) {
		str = cfg_getAttribute(&cfg, csSec, "drive_size");
		if (!str)
			return -1;
		dlen -= sizeof env->env_crc;
	}
	dlen += strtol(str, NULL, 0);
	if (!dlen)
		return -1;
	else
		dlen--;

	for (e = env->env_data; *e; e = nxt + 1) {
		for (nxt = e; *nxt; nxt++)
			if (nxt >= env->env_data + dlen) {
				printf("Error:: environment not terminated\n");
				return -1;
			}

		old = ub_envmatch(csName, e);
		if (old)
			break;
	}

	/* Delete any existing definition */
	if (old) {
		if (!*++nxt)
			*e = 0;
		else
			while (42) {
				*e = *nxt++;
				if (!*e && !*nxt)
					break;
				e++;
			}
		*++e = 0;
	}

	if (csValue) {
		/* Append new definition at the end */
		for (e = env->env_data; *e || *(e + 1); e++);
		if (e > env->env_data)
			e++;
		/* "name" + "=" + "val" +"\0\0" check u-boot-env size */
		len = strlen(csName) + 2; /* add '=' for first arg, ' ' for all others */
		len += strlen(csValue) + 1;
		if (len > env->env_data + dlen - e) {
			printf("Error:: Environment overflow!\n");
			return -1;
		}

		/* av pair */
		while ((*e = *csName++))
			e++;
		*e = '=';
		while ((*++e = *csValue++));

		/* end is marked with double '\0' */
		*++e = 0;
	}

	if (ub_flash_io(csSec, O_RDWR)) {
		printf("Error:: Can't write environment to flash!\n");
		return -1;
	}

	return 0;
}

int
ub_env(const char *csSec)
{
	char *e, *nxt;
	ssize_t dlen = 0;
	const char *str;

	FTRACE(3);

	str = cfg_getAttribute(&cfg, csSec, "env_size");
	if (!str) {
		str = cfg_getAttribute(&cfg, csSec, "drive_size");
		if (!str)
			return -1;
		dlen -= sizeof env->env_crc;
	}
	dlen += strtol(str, NULL, 0);
	if (!dlen)
		return -1;
	else
		dlen--;

	for (e = env->env_data; *e; e = nxt + 1) {
		for (nxt = e; *nxt; nxt++)
			if (nxt >= env->env_data + dlen) {
				printf("Error:: environment not terminated\n");
				return -1;
			}

		printf("%s\n", e);
	}

	return 0;
}