/* $NetBSD: prephandlers.c,v 1.4 2013/07/02 11:59:46 joerg Exp $ */

/* $NetBSD: prephandlers.c,v 1.4 2013/07/02 11:59:46 joerg Exp $ */

/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Tim Rightnour.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/types.h>
#include <sys/ioctl.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include <machine/nvram.h>

#include "defs.h"

extern char *path_prepnvram;
extern int eval;
extern int verbose;

static char err_str[BUFSIZE];

static void prep_notsupp(const struct extabent *, struct pnviocdesc *, char *);

/*
* XXX
* This file needs a recalc checksum routine, and a routine to call a
* write back to nvram. The prep NVRAM is stored in RAM after boot, to
* prevent horrific bitbanging on the NVRAM chip, we read and write into RAM
* until a save operation is called. At that time we write the ram-based
* NVRAM back to the physical NVRAM. This is a fairly expensive operation.
*/

/*
* There are several known fields that I either don't know how to
* deal with or require special treatment.
*/
static const struct extabent prepextab[] = {
{NULL, prep_notsupp},
};
#define BARF(str1, str2) { \
snprintf(err_str, sizeof err_str, "%s: %s", (str1), (str2)); \
++eval; \
return (err_str); \
};

void
prep_action(char *keyword, char *arg)
{
char *cp;

if ((cp = prep_handler(keyword, arg)) != NULL)
warnx("%s", cp);
return;
}

char *
prep_handler(char *keyword, char *arg)
{
struct pnviocdesc nvio;
const struct extabent *ex;
char nvio_buf[BUFSIZE];
int fd;

if ((fd = open(path_prepnvram, arg ? O_RDWR : O_RDONLY, 0640)) < 0)
BARF(path_prepnvram, strerror(errno));

/* Check to see if it's a special-case keyword. */
for (ex = prepextab; ex->ex_keyword != NULL; ++ex)
if (strcmp(ex->ex_keyword, keyword) == 0)
break;

memset(&nvio_buf[0], 0, sizeof(nvio_buf));
memset(&nvio, 0, sizeof(nvio));
nvio.pnv_name = keyword;
nvio.pnv_namelen = strlen(nvio.pnv_name);

if (arg) {
if (verbose) {
printf("old: ");

nvio.pnv_buf = &nvio_buf[0];
nvio.pnv_buflen = sizeof(nvio_buf);
if (ioctl(fd, PNVIOCGET, (char *) &nvio) < 0) {
(void)close(fd);
BARF("PNVIOCGET", strerror(errno));
}

if (nvio.pnv_buflen <= 0) {
printf("nothing available for %s\n", keyword);
goto out;
}
if (ex->ex_keyword != NULL)
(*ex->ex_handler) (ex, &nvio, NULL);
else
printf("%s\n", nvio.pnv_buf);
}
out:
if (ex->ex_keyword != NULL)
(*ex->ex_handler) (ex, &nvio, arg);
else {
nvio.pnv_buf = arg;
nvio.pnv_buflen = strlen(arg);
}

if (ioctl(fd, PNVIOCSET, (char *) &nvio) < 0) {
(void)close(fd);
BARF("invalid keyword", keyword);
}

if (verbose) {
printf("new: ");
if (ex->ex_keyword != NULL)
(*ex->ex_handler) (ex, &nvio, NULL);
else
printf("%s\n", nvio.pnv_buf);
}
} else {
nvio.pnv_buf = &nvio_buf[0];
nvio.pnv_buflen = sizeof(nvio_buf);
if (ioctl(fd, PNVIOCGET, (char *) &nvio) < 0) {
(void)close(fd);
BARF("PNVIOCGET", strerror(errno));
}

if (nvio.pnv_buflen <= 0) {
(void) snprintf(err_str, sizeof err_str,
"nothing available for %s", keyword);
return (err_str);
}
if (ex->ex_keyword != NULL)
(*ex->ex_handler) (ex, &nvio, NULL);
else
printf("%s=%s\n", keyword, nvio.pnv_buf);
}

(void) close(fd);
return (NULL);
}
/* ARGSUSED */
static void
prep_notsupp(const struct extabent * exent, struct pnviocdesc * nviop, char *arg)
{

warnx("property `%s' not yet supported", exent->ex_keyword);
}
/*
* Derrived from op_dump(). This should dump the contents of the PReP
* NVRAM chip.
*/

void
prep_dump(void)
{
struct pnviocdesc nvio1, nvio2;
char buf1[BUFSIZE], buf2[BUFSIZE], buf3[BUFSIZE], buf4[BUFSIZE];
int fd, optnode, nrofvars;

if ((fd = open(path_prepnvram, O_RDONLY, 0640)) < 0)
err(1, "open: %s", path_prepnvram);

memset(&nvio1, 0, sizeof(nvio1));

if (ioctl(fd, PNVIOCGETNUMGE, (char *) &nvio1) < 0)
err(1, "PNVIOCGETNUMGE");

nrofvars = nvio1.pnv_num;
if (nrofvars < 1)
err(1, "PNVIOCGETNUMGE");

memset(&nvio1, 0, sizeof(nvio1));
memset(buf1, 0, sizeof(buf1));
memset(buf2, 0, sizeof(buf2));
memset(buf3, 0, sizeof(buf3));
memset(buf4, 0, sizeof(buf4));
nvio1.pnv_name = NULL;
nvio1.pnv_buf = buf2;
nvio2.pnv_name = buf3;
nvio2.pnv_buf = buf4;
for (optnode = 0; optnode < nrofvars; optnode++) {
nvio1.pnv_buflen = sizeof(buf2);

if (ioctl(fd, PNVIOCGETNEXTNAME, (char *) &nvio1) < 0)
err(1, "PNVIOCGETNEXTNAME");

if (optnode == 0)
nvio1.pnv_name = buf1;

/* the property name is now stored in nvio1.pnv_buf */
strcpy(nvio2.pnv_name, nvio1.pnv_buf); /* safe */
nvio2.pnv_namelen = strlen(nvio2.pnv_name);

if (nvio2.pnv_namelen == 0) {
(void) close(fd);
return;
}
memset(nvio2.pnv_buf, 0, sizeof(buf4));
nvio2.pnv_buflen = sizeof(buf4);

if (ioctl(fd, PNVIOCGET, (char *) &nvio2) < 0)
err(1, "PNVIOCGET");

printf("%s=%s\n", nvio1.pnv_buf, nvio2.pnv_buf);

/* now clean out the buffers for the next loop */

memset(nvio1.pnv_name, 0, sizeof(buf1));
memset(nvio1.pnv_buf, 0, sizeof(buf2));
strcpy(nvio1.pnv_name, nvio2.pnv_name); /* safe */
nvio1.pnv_namelen = strlen(nvio1.pnv_name);
}
close(fd);
}