diff options
Diffstat (limited to 'package/openwrt/libnvram/nvram_linux.c')
| -rw-r--r-- | package/openwrt/libnvram/nvram_linux.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/package/openwrt/libnvram/nvram_linux.c b/package/openwrt/libnvram/nvram_linux.c new file mode 100644 index 0000000000..c41e32118a --- /dev/null +++ b/package/openwrt/libnvram/nvram_linux.c @@ -0,0 +1,320 @@ +/* + * NVRAM variable manipulation (Linux user mode half) + * + * Copyright 2004, 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. + * + * $Id$ + */ + +#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> + +#define PATH_DEV_NVRAM "/dev/nvram" + +/* Globals */ +static int nvram_fd = -1; +static char *nvram_buf = NULL; +int check_action(void); +int file_to_buf(char *path, char *buf, int len); + +int +nvram_init(void *unused) +{ + if ((nvram_fd = open(PATH_DEV_NVRAM, O_RDWR)) < 0) + goto err; + + /* Map kernel string buffer into user space */ + if ((nvram_buf = mmap(NULL, NVRAM_SPACE, PROT_READ, MAP_SHARED, nvram_fd, 0)) == MAP_FAILED) { + close(nvram_fd); + nvram_fd = -1; + goto err; + } + + return 0; + + err: + perror(PATH_DEV_NVRAM); + return errno; +} + +char * +nvram_get(const char *name) +{ + size_t count = strlen(name) + 1; + char tmp[100], *value; + unsigned long *off = (unsigned long *) tmp; + + if (nvram_fd < 0) + if (nvram_init(NULL)) + return NULL; + + if (count > sizeof(tmp)) { + if (!(off = malloc(count))) + return NULL; + } + + /* Get offset into mmap() space */ + strcpy((char *) off, name); + + count = read(nvram_fd, off, count); + + if (count == sizeof(unsigned long)) + 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 ret; + + if (nvram_fd < 0) + if ((ret = nvram_init(NULL))) + return ret; + + if (count == 0) + return 0; + + /* Get all variables */ + *buf = '\0'; + + ret = read(nvram_fd, buf, count); + + if (ret < 0) + perror(PATH_DEV_NVRAM); + + return (ret == count) ? 0 : ret; +} + +static int +_nvram_set(const char *name, const char *value) +{ + size_t count = strlen(name) + 1; + char tmp[100], *buf = tmp; + int ret; + + if (nvram_fd < 0) + if ((ret = nvram_init(NULL))) + return ret; + + /* Unset if value is NULL */ + if (value) + count += strlen(value) + 1; + + if (count > sizeof(tmp)) { + if (!(buf = malloc(count))) + 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) +{ + extern struct nvram_convert nvram_converts[]; + struct nvram_convert *v; + int ret; + + ret = _nvram_set(name, value); + + for(v = nvram_converts ; v->name ; v++) { + if(!strcmp(v->name, name)){ + if(strcmp(v->wl0_name,"")) _nvram_set(v->wl0_name, value); + if(strcmp(v->d11g_name,"")) _nvram_set(v->d11g_name, value); + } + } + + return ret; +} + +int +nvram_unset(const char *name) +{ + return _nvram_set(name, NULL); +} + +int +nvram_commit(void) +{ + int ret; + + cprintf("nvram_commit(): start\n"); + + if((check_action() == ACT_IDLE) || + (check_action() == ACT_SW_RESTORE) || + (check_action() == ACT_HW_RESTORE)){ + if (nvram_fd < 0) + if ((ret = nvram_init(NULL))) + return ret; + + ret = ioctl(nvram_fd, NVRAM_MAGIC, NULL); + + if (ret < 0) + perror(PATH_DEV_NVRAM); + + cprintf("nvram_commit(): end\n"); + } + else + cprintf("nvram_commit(): nothing to do...\n"); + + return ret; +} + +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 +} + +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; +} + +int +check_action(void) +{ + char buf[80] = ""; + + if(file_to_buf(ACTION_FILE, buf, sizeof(buf))){ + if(!strcmp(buf, "ACT_TFTP_UPGRADE")){ + cprintf("Upgrading from tftp now, quiet exit....\n"); + return ACT_TFTP_UPGRADE; + } + else if(!strcmp(buf, "ACT_WEBS_UPGRADE")){ + cprintf("Upgrading from web (https) now, quiet exit....\n"); + return ACT_WEBS_UPGRADE; + } + else if(!strcmp(buf, "ACT_WEB_UPGRADE")){ + cprintf("Upgrading from web (http) now, quiet exit....\n"); + return ACT_WEB_UPGRADE; + } + else if(!strcmp(buf, "ACT_SW_RESTORE")){ + cprintf("Receive restore command from web, quiet exit....\n"); + return ACT_SW_RESTORE; + } + else if(!strcmp(buf, "ACT_HW_RESTORE")){ + cprintf("Receive restore commond from resetbutton, quiet exit....\n"); + return ACT_HW_RESTORE; + } + } + //fprintf(stderr, "Waiting for upgrading....\n"); + return ACT_IDLE; +} + +int +file_to_buf(char *path, char *buf, int len) +{ + FILE *fp; + + memset(buf, 0 , len); + + if ((fp = fopen(path, "r"))) { + fgets(buf, len, fp); + fclose(fp); + return 1; + } + + return 0; +} |