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/*
* NVRAM variable manipulation (Linux user mode half)
*
* Copyright 2005, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*
* $Id: nvram_linux.c,v 1.18 2005/05/16 12:35:03 honor Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <typedefs.h>
#include <bcmnvram.h>
#include <nvram_convert.h>
#include <shutils.h>
#include <utils.h>
#include <shared.h>
#define PATH_DEV_NVRAM "/dev/nvram"
/* Globals */
static int nvram_fd = -1;
static char *nvram_buf = NULL;
int nvram_init(void *unused)
{
if ((nvram_fd = open(PATH_DEV_NVRAM, O_RDWR)) >= 0) {
/* Map kernel string buffer into user space */
if ((nvram_buf = mmap(NULL, NVRAM_SPACE, PROT_READ, MAP_SHARED, nvram_fd, 0)) != MAP_FAILED) {
fcntl(nvram_fd, F_SETFD, FD_CLOEXEC); // zzz
return 0;
}
close(nvram_fd);
nvram_fd = -1;
}
perror(PATH_DEV_NVRAM);
return errno;
}
char *nvram_get(const char *name)
{
char tmp[100];
char *value;
size_t count = strlen(name) + 1;
unsigned long *off = (unsigned long *)tmp;
if (nvram_fd < 0) {
if (nvram_init(NULL) != 0) return NULL;
}
if (count > sizeof(tmp)) {
if ((off = malloc(count)) == NULL) return NULL;
}
/* Get offset into mmap() space */
strcpy((char *) off, name);
count = read(nvram_fd, off, count);
if (count == sizeof(*off)) {
value = &nvram_buf[*off];
}
else {
value = NULL;
if (count < 0) perror(PATH_DEV_NVRAM);
}
if (off != (unsigned long *)tmp) free(off);
return value;
}
int nvram_getall(char *buf, int count)
{
int r;
if (count <= 0) return 0;
*buf = 0;
if (nvram_fd < 0) {
if ((r = nvram_init(NULL)) != 0) return r;
}
r = read(nvram_fd, buf, count);
if (r < 0) perror(PATH_DEV_NVRAM);
return (r == count) ? 0 : r;
}
static int _nvram_set(const char *name, const char *value)
{
size_t count = strlen(name) + 1;
char tmp[100];
char *buf = tmp;
int ret;
if (nvram_fd < 0) {
if ((ret = nvram_init(NULL)) != 0) return ret;
}
/* Unset if value is NULL */
if (value) count += strlen(value) + 1;
if (count > sizeof(tmp)) {
if ((buf = malloc(count)) == NULL) return -ENOMEM;
}
if (value) {
sprintf(buf, "%s=%s", name, value);
}
else {
strcpy(buf, name);
}
ret = write(nvram_fd, buf, count);
if (ret < 0) perror(PATH_DEV_NVRAM);
if (buf != tmp) free(buf);
return (ret == count) ? 0 : ret;
}
int nvram_set(const char *name, const char *value)
{
struct nvram_convert *v;
for (v = nvram_converts; v->name; v++) {
if (!strcmp(v->name, name)) {
_nvram_set(v->wl0_name, value);
break;
}
}
if (strncmp(name, "wl_", 3) == 0) {
char wl0[48];
if (strlen(name) < 32) {
sprintf(wl0, "wl0_%s", name + 3);
_nvram_set(wl0, value);
}
}
return _nvram_set(name, value);
}
int nvram_unset(const char *name)
{
return _nvram_set(name, NULL);
}
int nvram_commit(void)
{
int r = 0;
if (wait_action_idle(10)) {
if (nvram_fd < 0) {
if ((r = nvram_init(NULL)) != 0) return r;
}
set_action(ACT_NVRAM_COMMIT);
// nvram_unset("dirty");
r = ioctl(nvram_fd, NVRAM_MAGIC, NULL);
set_action(ACT_IDLE);
if (r < 0) {
perror(PATH_DEV_NVRAM);
cprintf("commit: error\n");
}
}
else {
cprintf("commit: system busy\n");
}
return r;
}
/*
int file2nvram(char *filename, char *varname)
{
FILE *fp;
int c,count;
int i=0,j=0;
char mem[10000],buf[30000];
if ( !(fp=fopen(filename,"rb") ))
return 0;
count=fread(mem,1,sizeof(mem),fp);
fclose(fp);
for (j=0;j<count;j++) {
if (i > sizeof(buf)-3 )
break;
c=mem[j];
if (c >= 32 && c <= 126 && c != '\\' && c != '~') {
buf[i++]=(unsigned char) c;
} else if (c==0) {
buf[i++]='~';
} else {
buf[i++]='\\';
sprintf(buf+i,"%02X",c);
i+=2;
}
}
if (i==0) return 0;
buf[i]=0;
//fprintf(stderr,"================ > file2nvram %s = [%s] \n",varname,buf);
nvram_set(varname,buf);
//nvram_commit(); //Barry adds for test
return 0;
}
int nvram2file(char *varname, char *filename) {
FILE *fp;
int c,tmp;
int i=0,j=0;
char *buf;
char mem[10000];
if ( !(fp=fopen(filename,"wb") ))
return 0;
buf=strdup(nvram_safe_get(varname));
//fprintf(stderr,"=================> nvram2file %s = [%s] \n",varname,buf);
while ( buf[i] && j < sizeof(mem)-3 ) {
if (buf[i] == '\\') {
i++;
tmp=buf[i+2];
buf[i+2]=0;
sscanf(buf+i,"%02X",&c);
buf[i+2]=tmp;
i+=2;
mem[j]=c;j++;
} else if (buf[i] == '~') {
mem[j]=0;j++;
i++;
} else {
mem[j]=buf[i];j++;
i++;
}
}
if (j<=0) return j;
j=fwrite(mem,1,j,fp);
fclose(fp);
free(buf);
return j;
}
*/
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