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Sourcecode: e2fsprogs version File versions

set_fields.c

/*
 * set_fields.c --- set a superblock value
 * 
 * Copyright (C) 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o.
 * 
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#define _XOPEN_SOURCE 500 /* for inclusion of strptime() */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <fcntl.h>
#include <utime.h>

#include "debugfs.h"
#include "uuid/uuid.h"
#include "e2p/e2p.h"

static struct ext2_super_block set_sb;
static struct ext2_inode set_inode;
static ext2_ino_t set_ino;
static int array_idx;

#define FLAG_ARRAY      0x0001

struct field_set_info {
      const char  *name;
      void  *ptr;
      unsigned int      size;
      errcode_t (*func)(struct field_set_info *info, char *arg);
      int flags;
      int max_idx;
};

static errcode_t parse_uint(struct field_set_info *info, char *arg);
static errcode_t parse_int(struct field_set_info *info, char *arg);
static errcode_t parse_string(struct field_set_info *info, char *arg);
static errcode_t parse_uuid(struct field_set_info *info, char *arg);
static errcode_t parse_hashalg(struct field_set_info *info, char *arg);
static errcode_t parse_time(struct field_set_info *info, char *arg);
static errcode_t parse_bmap(struct field_set_info *info, char *arg);

static struct field_set_info super_fields[] = {
      { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
      { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint },
      { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint },
      { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint },
      { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint },
      { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint },
      { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint },
      { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int },
      { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint },
      { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint },
      { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint },
      { "mtime", &set_sb.s_mtime, 4, parse_time },
      { "wtime", &set_sb.s_wtime, 4, parse_time },
      { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint },
      { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int },
      /* s_magic */
      { "state", &set_sb.s_state, 2, parse_uint },
      { "errors", &set_sb.s_errors, 2, parse_uint },
      { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint },
      { "lastcheck", &set_sb.s_lastcheck, 4, parse_time },
      { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint },
      { "creator_os", &set_sb.s_creator_os, 4, parse_uint },
      { "rev_level", &set_sb.s_rev_level, 4, parse_uint },
      { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint },
      { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint },
      { "first_ino", &set_sb.s_first_ino, 4, parse_uint },
      { "inode_size", &set_sb.s_inode_size, 2, parse_uint },
      { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint },
      { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint },
      { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint },
      { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint }, 
      { "uuid", &set_sb.s_uuid, 16, parse_uuid },
      { "volume_name",  &set_sb.s_volume_name, 16, parse_string },
      { "last_mounted",  &set_sb.s_last_mounted, 64, parse_string },
      { "lastcheck",  &set_sb.s_lastcheck, 4, parse_uint },
      { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, 
              4, parse_uint },
      { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
      { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
              parse_uint },
      { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2,
              parse_uint },
      /* s_padding1 */
      { "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid },
      { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint },
      { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint },
      { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint },
      { "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid },
      { "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg },
      { "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint },
      /* s_reserved_word_pad */
      { "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint },
      { "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint },
      { "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time },
      { "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY, 
        17 },
      { 0, 0, 0, 0 }
};

static struct field_set_info inode_fields[] = {
      { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
      { "mode", &set_inode.i_mode, 2, parse_uint },
      { "uid", &set_inode.i_uid, 2, parse_uint },
      { "size", &set_inode.i_uid, 4, parse_uint },
      { "atime", &set_inode.i_atime, 4, parse_time },
      { "ctime", &set_inode.i_ctime, 4, parse_time },
      { "mtime", &set_inode.i_mtime, 4, parse_time },
      { "dtime", &set_inode.i_dtime, 4, parse_time },
      { "gid", &set_inode.i_gid, 2, parse_uint },
      { "links_count", &set_inode.i_links_count, 2, parse_uint },
      { "blocks", &set_inode.i_blocks, 4, parse_uint },
      { "flags", &set_inode.i_flags, 4, parse_uint },
      { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
      { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY, 
        EXT2_NDIR_BLOCKS },
      { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
      { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
      { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
      { "generation", &set_inode.i_generation, 4, parse_uint },
      { "file_acl", &set_inode.i_file_acl, 4, parse_uint },
      { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
      { "faddr", &set_inode.i_faddr, 4, parse_uint },
      { "frag", &set_inode.osd2.linux2.l_i_frag, 8, parse_uint },
      { "fsize", &set_inode.osd2.linux2.l_i_fsize, 8, parse_uint },
      { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 8, parse_uint },
      { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 8, parse_uint },
      { "author", &set_inode.osd2.hurd2.h_i_author, 8, parse_uint },
      { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
      { 0, 0, 0, 0 }
};

static struct field_set_info *find_field(struct field_set_info *fields,
                               char *field)
{
      struct field_set_info *ss;
      const char  *prefix;
      char        *arg, *delim, *idx, *tmp;

      if (fields == super_fields)
            prefix = "s_";
      else
            prefix = "i_";
      if (strncmp(field, prefix, 2) == 0)
            field += 2;

      arg = malloc(strlen(field)+1);
      if (!arg)
            return NULL;
      strcpy(arg, field);

      idx = strchr(arg, '[');
      if (idx) {
            *idx++ = 0;
            delim = idx + strlen(idx) - 1;
            if (!*idx || *delim != ']')
                  idx = 0;
            else
                  *delim = 0;
      }
      /* 
       * Can we parse the number?
       */
      if (idx) {
            array_idx = strtol(idx, &tmp, 0);
            if (*tmp)
                  idx = 0;
      }

      for (ss = fields ; ss->name ; ss++) {
            if (ss->flags & FLAG_ARRAY) {
                  if (!idx || (strcmp(ss->name, arg) != 0))
                        continue;
                  if (ss->max_idx > 0 && array_idx >= ss->max_idx)
                        continue;
            } else {
                  if (strcmp(ss->name, field) != 0)
                        continue;
            }
            return ss;
      }

      return NULL;
}

static errcode_t parse_uint(struct field_set_info *info, char *arg)
{
      unsigned long     num;
      char *tmp;
      union {
            __u32 *ptr32;
            __u16 *ptr16;
            __u8  *ptr8;
      } u;

      u.ptr8 = (__u8 *) info->ptr;
      if (info->flags & FLAG_ARRAY)
            u.ptr8 += array_idx * info->size;

      num = strtoul(arg, &tmp, 0);
      if (*tmp) {
            fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
                  arg, info->name);
            return EINVAL;
      }
      switch (info->size) {
      case 4:
            *u.ptr32 = num;
            break;
      case 2:
            *u.ptr16 = num;
            break;
      case 1:
            *u.ptr8 = num;
            break;
      }
      return 0;
}

static errcode_t parse_int(struct field_set_info *info, char *arg)
{
      long  num;
      char *tmp;
      __s32 *ptr32;
      __s16 *ptr16;
      __s8  *ptr8;

      num = strtol(arg, &tmp, 0);
      if (*tmp) {
            fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
                  arg, info->name);
            return EINVAL;
      }
      switch (info->size) {
      case 4:
            ptr32 = (__s32 *) info->ptr;
            *ptr32 = num;
            break;
      case 2:
            ptr16 = (__s16 *) info->ptr;
            *ptr16 = num;
            break;
      case 1:
            ptr8 = (__s8 *) info->ptr;
            *ptr8 = num;
            break;
      }
      return 0;
}

static errcode_t parse_string(struct field_set_info *info, char *arg)
{
      char  *cp = (char *) info->ptr;

      if (strlen(arg) >= info->size) {
            fprintf(stderr, "Error maximum size for %s is %d.\n",
                  info->name, info->size);
            return EINVAL;
      }
      strcpy(cp, arg);
      return 0;
}

static errcode_t parse_time(struct field_set_info *info, char *arg)
{
      struct      tm    ts;
      __u32       *ptr32;

      ptr32 = (__u32 *) info->ptr;

      if (strcmp(arg, "now") == 0) {
            *ptr32 = time(0);
            return 0;
      }
      memset(&ts, 0, sizeof(ts));
#ifdef HAVE_STRPTIME
      strptime(arg, "%Y%m%d%H%M%S", &ts);
#else
      sscanf(arg, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
             &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
      ts.tm_year -= 1900;
      ts.tm_mon -= 1;
      if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
          ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
          ts.tm_min > 59 || ts.tm_sec > 61)
            ts.tm_mday = 0;
#endif
      if (ts.tm_mday == 0) {
            /* Try it as an integer... */
            return parse_uint(info, arg);
      }
      *ptr32 = mktime(&ts);
      return 0;
}

static errcode_t parse_uuid(struct field_set_info *info, char *arg)
{
      unsigned char *   p = (unsigned char *) info->ptr;
      
      if ((strcasecmp(arg, "null") == 0) ||
          (strcasecmp(arg, "clear") == 0)) {
            uuid_clear(p);
      } else if (strcasecmp(arg, "time") == 0) {
            uuid_generate_time(p);
      } else if (strcasecmp(arg, "random") == 0) {
            uuid_generate(p);
      } else if (uuid_parse(arg, p)) {
            fprintf(stderr, "Invalid UUID format: %s\n", arg);
            return EINVAL;
      }
      return 0;
}

static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
{
      int   hashv;
      unsigned char     *p = (unsigned char *) info->ptr;

      hashv = e2p_string2hash(arg);
      if (hashv < 0) {
            fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
            return EINVAL;
      }
      *p = hashv;
      return 0;
}

static errcode_t parse_bmap(struct field_set_info *info, char *arg)
{
      unsigned long     num;
      blk_t       blk;
      errcode_t   retval;
      char        *tmp;

      num = strtoul(arg, &tmp, 0);
      if (*tmp) {
            fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
                  arg, info->name);
            return EINVAL;
      }
      blk = num;

      retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 
                       array_idx, &blk);
      if (retval) {
            com_err("set_inode", retval, "while setting block map");
      }
      return retval;
}


static void print_possible_fields(struct field_set_info *fields)
{
      struct field_set_info *ss;
      const char  *type, *cmd;
      FILE *f;
      char name[40], idx[40];

      if (fields == super_fields) {
            type = "Superblock";
            cmd = "set_super_value";
      } else {
            type = "Inode";
            cmd = "set_inode";
      }
      f = open_pager();

      fprintf(f, "%s fields supported by the %s command:\n", type, cmd);

      for (ss = fields ; ss->name ; ss++) {
            type = "unknown";
            if (ss->func == parse_string)
                  type = "string";
            else if (ss->func == parse_int)
                  type = "integer";
            else if (ss->func == parse_uint)
                  type = "unsigned integer";
            else if (ss->func == parse_uuid)
                  type = "UUID";
            else if (ss->func == parse_hashalg)
                  type = "hash algorithm";
            else if (ss->func == parse_time)
                  type = "date/time";
            else if (ss->func == parse_bmap)
                  type = "set physical->logical block map";
            strcpy(name, ss->name);
            if (ss->flags & FLAG_ARRAY) {
                  if (ss->max_idx > 0) 
                        sprintf(idx, "[%d]", ss->max_idx);
                  else
                        strcpy(idx, "[]");
                  strcat(name, idx);
            }
            fprintf(f, "\t%-20s\t%s\n", name, type);
      }
      close_pager(f);
}


void do_set_super(int argc, char *argv[])
{
      const char *usage = "<field> <value>\n"
            "\t\"set_super_value -l\" will list the names of "
            "superblock fields\n\twhich can be set.";
      static struct field_set_info *ss;
      
      if ((argc == 2) && !strcmp(argv[1], "-l")) {
            print_possible_fields(super_fields);
            return;
      }

      if (common_args_process(argc, argv, 3, 3, "set_super_value",
                        usage, CHECK_FS_RW))
            return;

      if ((ss = find_field(super_fields, argv[1])) == 0) {
            com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
            return;
      }
      set_sb = *current_fs->super;
      if (ss->func(ss, argv[2]) == 0) {
            *current_fs->super = set_sb;
            ext2fs_mark_super_dirty(current_fs);
      }
}

void do_set_inode(int argc, char *argv[])
{
      const char *usage = "<inode> <field> <value>\n"
            "\t\"set_inode_field -l\" will list the names of "
            "the fields in an ext2 inode\n\twhich can be set.";
      static struct field_set_info *ss;
      
      if ((argc == 2) && !strcmp(argv[1], "-l")) {
            print_possible_fields(inode_fields);
            return;
      }

      if (common_args_process(argc, argv, 4, 4, "set_inode",
                        usage, CHECK_FS_RW))
            return;

      if ((ss = find_field(inode_fields, argv[2])) == 0) {
            com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
            return;
      }

      set_ino = string_to_inode(argv[1]);
      if (!set_ino)
            return;

      if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
            return;

      if (ss->func(ss, argv[3]) == 0) {
            if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
                  return;
      }
}

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