package/openwrt/libnvram/nvram_linux.c

   1 /*
   2  * NVRAM variable manipulation (Linux user mode half)
   3  *
   4  * Copyright 2004, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  *
  12  * $Id$
  13  */
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <errno.h>
  19 #include <error.h>
  20 #include <string.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <sys/mman.h>
  26
  27 #include <typedefs.h>
  28 #include <bcmnvram.h>
  29 #include <nvram_convert.h>
  30 #include <shutils.h>
  31 #include <utils.h>
  32
  33 #define PATH_DEV_NVRAM "/dev/nvram"
  34
  35 /* Globals */
  36 static int nvram_fd = -1;
  37 static char *nvram_buf = NULL;
  38 int check_action(void);
  39 int file_to_buf(char *path, char *buf, int len);
  40
  41 int
  42 nvram_init(void *unused)
  43 {
  44         if ((nvram_fd = open(PATH_DEV_NVRAM, O_RDWR)) < 0)
  45                 goto err;
  46
  47         /* Map kernel string buffer into user space */
  48         if ((nvram_buf = mmap(NULL, NVRAM_SPACE, PROT_READ, MAP_SHARED, nvram_fd, 0)) == MAP_FAILED) {
  49                 close(nvram_fd);
  50                 nvram_fd = -1;
  51                 goto err;
  52         }
  53
  54         return 0;
  55
  56  err:
  57         perror(PATH_DEV_NVRAM);
  58         return errno;
  59 }
  60
  61 char *
  62 nvram_get(const char *name)
  63 {
  64         size_t count = strlen(name) + 1;
  65         char tmp[100], *value;
  66         unsigned long *off = (unsigned long *) tmp;
  67
  68         if (nvram_fd < 0)
  69                 if (nvram_init(NULL))
  70                         return NULL;
  71
  72         if (count > sizeof(tmp)) {
  73                 if (!(off = malloc(count)))
  74                         return NULL;
  75         }
  76
  77         /* Get offset into mmap() space */
  78         strcpy((char *) off, name);
  79
  80         count = read(nvram_fd, off, count);
  81
  82         if (count == sizeof(unsigned long))
  83                 value = &nvram_buf[*off];
  84         else
  85                 value = NULL;
  86
  87         if (count < 0)
  88                 perror(PATH_DEV_NVRAM);
  89
  90         if (off != (unsigned long *) tmp)
  91                 free(off);
  92
  93         return value;
  94 }
  95
  96 int
  97 nvram_getall(char *buf, int count)
  98 {
  99         int ret;
 100
 101         if (nvram_fd < 0)
 102                 if ((ret = nvram_init(NULL)))
 103                         return ret;
 104
 105         if (count == 0)
 106                 return 0;
 107
 108         /* Get all variables */
 109         *buf = '\0';
 110
 111         ret = read(nvram_fd, buf, count);
 112
 113         if (ret < 0)
 114                 perror(PATH_DEV_NVRAM);
 115
 116         return (ret == count) ? 0 : ret;
 117 }
 118
 119 static int
 120 _nvram_set(const char *name, const char *value)
 121 {
 122         size_t count = strlen(name) + 1;
 123         char tmp[100], *buf = tmp;
 124         int ret;
 125
 126         if (nvram_fd < 0)
 127                 if ((ret = nvram_init(NULL)))
 128                         return ret;
 129
 130         /* Unset if value is NULL */
 131         if (value)
 132                 count += strlen(value) + 1;
 133
 134         if (count > sizeof(tmp)) {
 135                 if (!(buf = malloc(count)))
 136                         return -ENOMEM;
 137         }
 138
 139         if (value)
 140                 sprintf(buf, "%s=%s", name, value);
 141         else
 142                 strcpy(buf, name);
 143
 144         ret = write(nvram_fd, buf, count);
 145
 146         if (ret < 0)
 147                 perror(PATH_DEV_NVRAM);
 148
 149         if (buf != tmp)
 150                 free(buf);
 151
 152         return (ret == count) ? 0 : ret;
 153 }
 154
 155 int
 156 nvram_set(const char *name, const char *value)
 157 {
 158          extern struct nvram_convert nvram_converts[];
 159          struct nvram_convert *v;
 160          int ret;
 161
 162          ret = _nvram_set(name, value);
 163
 164          for(v = nvram_converts ; v->name ; v++) {
 165                  if(!strcmp(v->name, name)){
 166                          if(strcmp(v->wl0_name,""))      _nvram_set(v->wl0_name, value);
 167                          if(strcmp(v->d11g_name,""))     _nvram_set(v->d11g_name, value);
 168                  }
 169          }
 170
 171          return ret;
 172 }
 173
 174 int
 175 nvram_unset(const char *name)
 176 {
 177         return _nvram_set(name, NULL);
 178 }
 179
 180 int
 181 nvram_commit(void)
 182 {
 183         int ret;
 184
 185         cprintf("nvram_commit(): start\n");
 186
 187         if((check_action() == ACT_IDLE) ||
 188            (check_action() == ACT_SW_RESTORE) ||
 189            (check_action() == ACT_HW_RESTORE)){
 190                 if (nvram_fd < 0)
 191                         if ((ret = nvram_init(NULL)))
 192                                 return ret;
 193
 194                 ret = ioctl(nvram_fd, NVRAM_MAGIC, NULL);
 195
 196                 if (ret < 0)
 197                         perror(PATH_DEV_NVRAM);
 198
 199                 cprintf("nvram_commit(): end\n");
 200         }
 201         else
 202                 cprintf("nvram_commit():  nothing to do...\n");
 203
 204         return ret;
 205 }
 206
 207 int file2nvram(char *filename, char *varname) {
 208    FILE *fp;
 209    int c,count;
 210    int i=0,j=0;
 211    char mem[10000],buf[30000];
 212
 213    if ( !(fp=fopen(filename,"rb") ))
 214         return 0;
 215
 216    count=fread(mem,1,sizeof(mem),fp);
 217    fclose(fp);
 218    for (j=0;j<count;j++) {
 219         if  (i > sizeof(buf)-3 )
 220                 break;
 221         c=mem[j];
 222         if (c >= 32 && c <= 126 && c != '\\' && c != '~')  {
 223                 buf[i++]=(unsigned char) c;
 224         } else if (c==0) {
 225                 buf[i++]='~';
 226         } else {
 227                 buf[i++]='\\';
 228                 sprintf(buf+i,"%02X",c);
 229                 i+=2;
 230         }
 231    }
 232    if (i==0) return 0;
 233    buf[i]=0;
 234    //fprintf(stderr,"================ > file2nvram %s = [%s] \n",varname,buf);
 235    nvram_set(varname,buf);
 236    //nvram_commit(); //Barry adds for test
 237 }
 238
 239 int nvram2file(char *varname, char *filename) {
 240    FILE *fp;
 241    int c,tmp;
 242    int i=0,j=0;
 243    char *buf;
 244    char mem[10000];
 245
 246    if ( !(fp=fopen(filename,"wb") ))
 247         return 0;
 248
 249    buf=strdup(nvram_safe_get(varname));
 250    //fprintf(stderr,"=================> nvram2file %s = [%s] \n",varname,buf);
 251    while (  buf[i] && j < sizeof(mem)-3 ) {
 252         if (buf[i] == '\\')  {
 253                 i++;
 254                 tmp=buf[i+2];
 255                 buf[i+2]=0;
 256                 sscanf(buf+i,"%02X",&c);
 257                 buf[i+2]=tmp;
 258                 i+=2;
 259                 mem[j]=c;j++;
 260         } else if (buf[i] == '~') {
 261                 mem[j]=0;j++;
 262                 i++;
 263         } else {
 264                 mem[j]=buf[i];j++;
 265                 i++;
 266         }
 267    }
 268    if (j<=0) return j;
 269    j=fwrite(mem,1,j,fp);
 270    fclose(fp);
 271    free(buf);
 272    return j;
 273 }
 274
 275 int
 276 check_action(void)
 277 {
 278         char buf[80] = "";
 279
 280         if(file_to_buf(ACTION_FILE, buf, sizeof(buf))){
 281                 if(!strcmp(buf, "ACT_TFTP_UPGRADE")){
 282                         cprintf("Upgrading from tftp now, quiet exit....\n");
 283                         return ACT_TFTP_UPGRADE;
 284                 }
 285                 else if(!strcmp(buf, "ACT_WEBS_UPGRADE")){
 286                         cprintf("Upgrading from web (https) now, quiet exit....\n");
 287                         return ACT_WEBS_UPGRADE;
 288                 }
 289                 else if(!strcmp(buf, "ACT_WEB_UPGRADE")){
 290                         cprintf("Upgrading from web (http) now, quiet exit....\n");
 291                         return ACT_WEB_UPGRADE;
 292                 }
 293                 else if(!strcmp(buf, "ACT_SW_RESTORE")){
 294                         cprintf("Receive restore command from web, quiet exit....\n");
 295                         return ACT_SW_RESTORE;
 296                 }
 297                 else if(!strcmp(buf, "ACT_HW_RESTORE")){
 298                         cprintf("Receive restore commond from resetbutton, quiet exit....\n");
 299                         return ACT_HW_RESTORE;
 300                 }
 301         }
 302         //fprintf(stderr, "Waiting for upgrading....\n");
 303         return ACT_IDLE;
 304 }
 305
 306 int
 307 file_to_buf(char *path, char *buf, int len)
 308 {
 309         FILE *fp;
 310
 311         memset(buf, 0 , len);
 312
 313         if ((fp = fopen(path, "r"))) {
 314                 fgets(buf, len, fp);
 315                 fclose(fp);
 316                 return 1;
 317         }
 318
 319         return 0;
 320 }