jffs2reset.c

   1 /*
   2  * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License version 2.1
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <sys/mount.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17
  18 #include <libubox/ulog.h>
  19
  20 #include <fcntl.h>
  21 #include <dirent.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26
  27 #include "libfstools/libfstools.h"
  28 #include "libfstools/volume.h"
  29
  30 static int
  31 ask_user(int argc, char **argv)
  32 {
  33         if ((argc < 2) || strcmp(argv[1], "-y")) {
  34                 ULOG_WARN("This will erase all settings and remove any installed packages. Are you sure? [N/y]\n");
  35                 if (getchar() != 'y')
  36                         return -1;
  37         }
  38         return 0;
  39
  40 }
  41
  42 static int
  43 jffs2_reset(int argc, char **argv)
  44 {
  45         struct volume *v;
  46         char *mp;
  47
  48         if (ask_user(argc, argv))
  49                 return -1;
  50
  51         if (find_filesystem("overlay")) {
  52                 ULOG_ERR("overlayfs not supported by kernel\n");
  53                 return -1;
  54         }
  55
  56         v = volume_find("rootfs_data");
  57         if (!v) {
  58                 ULOG_ERR("MTD partition 'rootfs_data' not found\n");
  59                 return -1;
  60         }
  61
  62         mp = find_mount_point(v->blk, 1);
  63         if (mp) {
  64                 ULOG_INFO("%s is mounted as %s, only erasing files\n", v->blk, mp);
  65                 overlay_delete(mp, false);
  66                 mount(mp, "/", NULL, MS_REMOUNT, 0);
  67         } else {
  68                 ULOG_INFO("%s is not mounted, erasing it\n", v->blk);
  69                 volume_erase_all(v);
  70         }
  71
  72         return 0;
  73 }
  74
  75 static int
  76 jffs2_mark(int argc, char **argv)
  77 {
  78         __u32 deadc0de = __cpu_to_be32(0xdeadc0de);
  79         struct volume *v;
  80         size_t sz;
  81         int fd;
  82
  83         if (ask_user(argc, argv))
  84                 return -1;
  85
  86         v = volume_find("rootfs_data");
  87         if (!v) {
  88                 ULOG_ERR("MTD partition 'rootfs_data' not found\n");
  89                 return -1;
  90         }
  91
  92         fd = open(v->blk, O_WRONLY);
  93         ULOG_INFO("%s - marking with deadc0de\n", v->blk);
  94         if (!fd) {
  95                 ULOG_ERR("opening %s failed\n", v->blk);
  96                 return -1;
  97         }
  98
  99         sz = write(fd, &deadc0de, sizeof(deadc0de));
 100         close(fd);
 101
 102         if (sz != 4) {
 103                 ULOG_ERR("writing %s failed: %s\n", v->blk, strerror(errno));
 104                 return -1;
 105         }
 106
 107         return 0;
 108 }
 109
 110 int main(int argc, char **argv)
 111 {
 112         if (!strcmp(*argv, "jffs2mark"))
 113                 return jffs2_mark(argc, argv);
 114         return jffs2_reset(argc, argv);
 115 }