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321 lines
6.4 KiB
C
321 lines
6.4 KiB
C
/*
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* NVRAM variable manipulation (Linux user mode half)
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*
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* Copyright 2004, Broadcom Corporation
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* All Rights Reserved.
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*
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* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
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* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
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*
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* $Id$
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <error.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <typedefs.h>
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#include <bcmnvram.h>
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#include <nvram_convert.h>
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#include <shutils.h>
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#include <utils.h>
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#define PATH_DEV_NVRAM "/dev/nvram"
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/* Globals */
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static int nvram_fd = -1;
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static char *nvram_buf = NULL;
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int check_action(void);
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int file_to_buf(char *path, char *buf, int len);
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int
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nvram_init(void *unused)
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{
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if ((nvram_fd = open(PATH_DEV_NVRAM, O_RDWR)) < 0)
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goto err;
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/* Map kernel string buffer into user space */
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if ((nvram_buf = mmap(NULL, NVRAM_SPACE, PROT_READ, MAP_SHARED, nvram_fd, 0)) == MAP_FAILED) {
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close(nvram_fd);
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nvram_fd = -1;
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goto err;
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}
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return 0;
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err:
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perror(PATH_DEV_NVRAM);
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return errno;
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}
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char *
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nvram_get(const char *name)
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{
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size_t count = strlen(name) + 1;
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char tmp[100], *value;
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unsigned long *off = (unsigned long *) tmp;
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if (nvram_fd < 0)
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if (nvram_init(NULL))
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return NULL;
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if (count > sizeof(tmp)) {
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if (!(off = malloc(count)))
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return NULL;
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}
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/* Get offset into mmap() space */
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strcpy((char *) off, name);
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count = read(nvram_fd, off, count);
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if (count == sizeof(unsigned long))
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value = &nvram_buf[*off];
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else
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value = NULL;
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if (count < 0)
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perror(PATH_DEV_NVRAM);
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if (off != (unsigned long *) tmp)
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free(off);
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return value;
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}
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int
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nvram_getall(char *buf, int count)
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{
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int ret;
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if (nvram_fd < 0)
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if ((ret = nvram_init(NULL)))
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return ret;
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if (count == 0)
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return 0;
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/* Get all variables */
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*buf = '\0';
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ret = read(nvram_fd, buf, count);
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if (ret < 0)
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perror(PATH_DEV_NVRAM);
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return (ret == count) ? 0 : ret;
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}
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static int
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_nvram_set(const char *name, const char *value)
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{
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size_t count = strlen(name) + 1;
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char tmp[100], *buf = tmp;
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int ret;
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if (nvram_fd < 0)
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if ((ret = nvram_init(NULL)))
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return ret;
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/* Unset if value is NULL */
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if (value)
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count += strlen(value) + 1;
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if (count > sizeof(tmp)) {
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if (!(buf = malloc(count)))
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return -ENOMEM;
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}
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if (value)
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sprintf(buf, "%s=%s", name, value);
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else
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strcpy(buf, name);
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ret = write(nvram_fd, buf, count);
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if (ret < 0)
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perror(PATH_DEV_NVRAM);
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if (buf != tmp)
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free(buf);
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return (ret == count) ? 0 : ret;
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}
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int
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nvram_set(const char *name, const char *value)
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{
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extern struct nvram_convert nvram_converts[];
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struct nvram_convert *v;
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int ret;
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ret = _nvram_set(name, value);
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for(v = nvram_converts ; v->name ; v++) {
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if(!strcmp(v->name, name)){
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if(strcmp(v->wl0_name,"")) _nvram_set(v->wl0_name, value);
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if(strcmp(v->d11g_name,"")) _nvram_set(v->d11g_name, value);
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}
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}
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return ret;
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}
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int
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nvram_unset(const char *name)
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{
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return _nvram_set(name, NULL);
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}
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int
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nvram_commit(void)
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{
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int ret;
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cprintf("nvram_commit(): start\n");
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if((check_action() == ACT_IDLE) ||
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(check_action() == ACT_SW_RESTORE) ||
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(check_action() == ACT_HW_RESTORE)){
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if (nvram_fd < 0)
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if ((ret = nvram_init(NULL)))
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return ret;
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ret = ioctl(nvram_fd, NVRAM_MAGIC, NULL);
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if (ret < 0)
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perror(PATH_DEV_NVRAM);
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cprintf("nvram_commit(): end\n");
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}
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else
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cprintf("nvram_commit(): nothing to do...\n");
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return ret;
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}
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int file2nvram(char *filename, char *varname) {
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FILE *fp;
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int c,count;
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int i=0,j=0;
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char mem[10000],buf[30000];
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if ( !(fp=fopen(filename,"rb") ))
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return 0;
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count=fread(mem,1,sizeof(mem),fp);
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fclose(fp);
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for (j=0;j<count;j++) {
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if (i > sizeof(buf)-3 )
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break;
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c=mem[j];
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if (c >= 32 && c <= 126 && c != '\\' && c != '~') {
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buf[i++]=(unsigned char) c;
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} else if (c==0) {
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buf[i++]='~';
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} else {
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buf[i++]='\\';
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sprintf(buf+i,"%02X",c);
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i+=2;
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}
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}
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if (i==0) return 0;
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buf[i]=0;
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//fprintf(stderr,"================ > file2nvram %s = [%s] \n",varname,buf);
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nvram_set(varname,buf);
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//nvram_commit(); //Barry adds for test
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}
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int nvram2file(char *varname, char *filename) {
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FILE *fp;
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int c,tmp;
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int i=0,j=0;
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char *buf;
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char mem[10000];
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if ( !(fp=fopen(filename,"wb") ))
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return 0;
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buf=strdup(nvram_safe_get(varname));
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//fprintf(stderr,"=================> nvram2file %s = [%s] \n",varname,buf);
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while ( buf[i] && j < sizeof(mem)-3 ) {
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if (buf[i] == '\\') {
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i++;
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tmp=buf[i+2];
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buf[i+2]=0;
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sscanf(buf+i,"%02X",&c);
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buf[i+2]=tmp;
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i+=2;
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mem[j]=c;j++;
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} else if (buf[i] == '~') {
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mem[j]=0;j++;
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i++;
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} else {
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mem[j]=buf[i];j++;
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i++;
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}
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}
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if (j<=0) return j;
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j=fwrite(mem,1,j,fp);
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fclose(fp);
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free(buf);
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return j;
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}
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int
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check_action(void)
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{
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char buf[80] = "";
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if(file_to_buf(ACTION_FILE, buf, sizeof(buf))){
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if(!strcmp(buf, "ACT_TFTP_UPGRADE")){
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cprintf("Upgrading from tftp now, quiet exit....\n");
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return ACT_TFTP_UPGRADE;
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}
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else if(!strcmp(buf, "ACT_WEBS_UPGRADE")){
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cprintf("Upgrading from web (https) now, quiet exit....\n");
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return ACT_WEBS_UPGRADE;
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}
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else if(!strcmp(buf, "ACT_WEB_UPGRADE")){
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cprintf("Upgrading from web (http) now, quiet exit....\n");
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return ACT_WEB_UPGRADE;
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}
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else if(!strcmp(buf, "ACT_SW_RESTORE")){
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cprintf("Receive restore command from web, quiet exit....\n");
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return ACT_SW_RESTORE;
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}
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else if(!strcmp(buf, "ACT_HW_RESTORE")){
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cprintf("Receive restore commond from resetbutton, quiet exit....\n");
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return ACT_HW_RESTORE;
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}
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}
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//fprintf(stderr, "Waiting for upgrading....\n");
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return ACT_IDLE;
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}
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int
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file_to_buf(char *path, char *buf, int len)
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{
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FILE *fp;
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memset(buf, 0 , len);
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if ((fp = fopen(path, "r"))) {
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fgets(buf, len, fp);
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fclose(fp);
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return 1;
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}
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return 0;
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}
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