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               /* * Flags used by the common argument processing functions */#define CHECK_FS_RW 0x0001#define CHECK_FS_BITMAPS 0x0002#define CHECK_FS_NOTOPEN 0x0004#ifdef DLL_EXPORT#define DLLEXPORT __declspec(dllexport)#else#define DLLEXPORT#endifext2_filsys current_fs = NULL;ext2_ino_t root, cwd;DLLEXPORTint open_filesystem(char *device, int open_flags, blk_t superblock, blk_t blocksize, int catastrophic){ int retval; if (superblock != 0 && blocksize == 0) { com_err(device, 0, "if you specify the superblock, you must also specify the block size"); current_fs = NULL; return; } if (catastrophic && (open_flags & EXT2_FLAG_RW)) { com_err(device, 0, "opening read-only because of catastrophic mode"); open_flags &= ~EXT2_FLAG_RW; } retval = ext2fs_open(device, open_flags, superblock, blocksize, nt_io_manager(), ¤t_fs); if (retval) { com_err(device, retval, "while opening filesystem"); current_fs = NULL; return; } if (catastrophic) com_err(device, 0, "catastrophic mode - not reading inode or group bitmaps"); else { retval = ext2fs_read_inode_bitmap(current_fs); if (retval) { com_err(device, retval, "while reading inode bitmap"); goto errout; } retval = ext2fs_read_block_bitmap(current_fs); if (retval) { com_err(device, retval, "while reading block bitmap"); goto errout; } } root = cwd = EXT2_ROOT_INO; return 0;errout: retval = ext2fs_close(current_fs); if (retval) com_err(device, retval, "while trying to close filesystem"); current_fs = NULL; return -1;}DLLEXPORTvoid close_filesystem(void){ int retval; if (current_fs->flags & EXT2_FLAG_IB_DIRTY) { retval = ext2fs_write_inode_bitmap(current_fs); if (retval) com_err("ext2fs_write_inode_bitmap", retval, ""); } if (current_fs->flags & EXT2_FLAG_BB_DIRTY) { retval = ext2fs_write_block_bitmap(current_fs); if (retval) com_err("ext2fs_write_block_bitmap", retval, ""); } retval = ext2fs_close(current_fs); if (retval) com_err("ext2fs_close", retval, ""); current_fs = NULL; return;}/* * This routine is used whenever a command needs to turn a string into * an inode. */ext2_ino_t string_to_inode(char *str){ ext2_ino_t ino; int len = strlen(str); char *end; int retval; /* * If the string is of the form 
               
                , then treat it as an * inode number. */ if ((len > 2) && (str[0] == '<') && (str[len-1] == '>')) { ino = strtoul(str+1, &end, 0); if (*end=='>') return ino; } retval = ext2fs_namei(current_fs, root, cwd, str, &ino); if (retval) { com_err(str, retval, ""); return 0; } return ino;}/* * This routine returns 1 if the filesystem is not open, and prints an * error message to that effect. */int check_fs_open(char *name){ if (!current_fs) { com_err(name, 0, "Filesystem not open"); return 1; } return 0;}/* * This routine returns 1 if a filesystem is open, and prints an * error message to that effect. */int check_fs_not_open(char *name){ if (current_fs) { com_err(name, 0, "Filesystem %s is still open. Close it first.\n", current_fs->device_name); return 1; } return 0;}/* * This routine returns 1 if a filesystem is not opened read/write, * and prints an error message to that effect. */int check_fs_read_write(char *name){ if (!(current_fs->flags & EXT2_FLAG_RW)) { com_err(name, 0, "Filesystem opened read/only"); return 1; } return 0;}/* * This routine returns 1 if a filesystem is doesn't have its inode * and block bitmaps loaded, and prints an error message to that * effect. */int check_fs_bitmaps(char *name){ if (!current_fs->block_map || !current_fs->inode_map) { com_err(name, 0, "Filesystem bitmaps not loaded"); return 1; } return 0;}/* * This function takes a __u32 time value and converts it to a string, * using ctime */char *time_to_string(__u32 cl){ time_t t = (time_t) cl; return ctime(&t);}int debugfs_read_inode(ext2_ino_t ino, struct ext2_inode * inode, const char *cmd){ int retval; retval = ext2fs_read_inode(current_fs, ino, inode); if (retval) { com_err(cmd, retval, "while reading inode %u", ino); return 1; } return 0;}int debugfs_write_inode(ext2_ino_t ino, struct ext2_inode * inode, const char *cmd){ int retval; retval = ext2fs_write_inode(current_fs, ino, inode); if (retval) { com_err(cmd, retval, "while writing inode %u", ino); return 1; } return 0;}/* * This is a common helper function used by the command processing * routines */int common_args_process(int argc, char *argv[], int min_argc, int max_argc, const char *cmd, const char *usage, int flags){ if (argc < min_argc || argc > max_argc) { com_err(argv[0], 0, "Usage: %s %s", cmd, usage); return 1; } if (flags & CHECK_FS_NOTOPEN) { if (check_fs_not_open(argv[0])) return 1; } else { if (check_fs_open(argv[0])) return 1; } if ((flags & CHECK_FS_RW) && check_fs_read_write(argv[0])) return 1; if ((flags & CHECK_FS_BITMAPS) && check_fs_bitmaps(argv[0])) return 1; return 0;}/* * This is a helper function used by do_stat, do_freei, do_seti, and * do_testi, etc. Basically, any command which takes a single * argument which is a file/inode number specifier. */int common_inode_args_process(int argc, char *argv[], ext2_ino_t *inode, int flags){ if (common_args_process(argc, argv, 2, 2, argv[0], "
                
                 ", flags)) return 1; *inode = string_to_inode(argv[1]); if (!*inode) return 1; return 0;}static void modify_u16(char *com, const char *prompt, const char *format, __u16 *val){ char buf[200]; unsigned long v; char *tmp; sprintf(buf, format, *val); printf("%30s [%s] ", prompt, buf); fgets(buf, sizeof(buf), stdin); if (buf[strlen (buf) - 1] == '\n') buf[strlen (buf) - 1] = '\0'; if (!buf[0]) return; v = strtoul(buf, &tmp, 0); if (*tmp) com_err(com, 0, "Bad value - %s", buf); else *val = v;}static void modify_u32(char *com, const char *prompt, const char *format, __u32 *val){ char buf[200]; unsigned long v; char *tmp; sprintf(buf, format, *val); printf("%30s [%s] ", prompt, buf); fgets(buf, sizeof(buf), stdin); if (buf[strlen (buf) - 1] == '\n') buf[strlen (buf) - 1] = '\0'; if (!buf[0]) return; v = strtoul(buf, &tmp, 0); if (*tmp) com_err(com, 0, "Bad value - %s", buf); else *val = v;}#define COMMAND_MI "mi"DLLEXPORTvoid do_modify_inode(int readonly, char *filename, unsigned long mode){ struct ext2_inode inode; ext2_ino_t inode_num; int i; unsigned char *frag, *fsize; char buf[80]; int os; const char *hex_format = "0x%x"; const char *octal_format = "0%o"; const char *decimal_format = "%d"; inode_num = string_to_inode(filename); if (!inode_num) return ;/* if (common_inode_args_process(argc, argv, &inode_num, CHECK_FS_RW)) return;*/ os = current_fs->super->s_creator_os; if (debugfs_read_inode(inode_num, &inode, filename)) return; printf("Current Mode [0%o] \n", inode.i_mode); inode.i_mode = mode; #if 0 modify_u16(COMMAND_MI, "Mode", octal_format, &inode.i_mode); modify_u16(COMMAND_MI, "User ID", decimal_format, &inode.i_uid); modify_u16(COMMAND_MI, "Group ID", decimal_format, &inode.i_gid); modify_u32(COMMAND_MI, "Size", decimal_format, &inode.i_size); modify_u32(COMMAND_MI, "Creation time", decimal_format, &inode.i_ctime); modify_u32(COMMAND_MI, "Modification time", decimal_format, &inode.i_mtime); modify_u32(COMMAND_MI, "Access time", decimal_format, &inode.i_atime); modify_u32(COMMAND_MI, "Deletion time", decimal_format, &inode.i_dtime); modify_u16(COMMAND_MI, "Link count", decimal_format, &inode.i_links_count); modify_u32(COMMAND_MI, "Block count", decimal_format, &inode.i_blocks); modify_u32(COMMAND_MI, "File flags", hex_format, &inode.i_flags); modify_u32(COMMAND_MI, "Generation", hex_format, &inode.i_generation);#if 0 modify_u32(COMMAND_MI, "Reserved1", decimal_format, &inode.i_reserved1);#endif modify_u32(COMMAND_MI, "File acl", decimal_format, &inode.i_file_acl); if (LINUX_S_ISDIR(inode.i_mode)) modify_u32(argv[0], "Directory acl", decimal_format, &inode.i_dir_acl); else modify_u32(argv[0], "High 32bits of size", decimal_format, &inode.i_size_high); if (current_fs->super->s_creator_os == EXT2_OS_HURD) modify_u32(argv[0], "Translator Block", decimal_format, &inode.osd1.hurd1.h_i_translator); modify_u32(argv[0], "Fragment address", decimal_format, &inode.i_faddr); switch (os) { case EXT2_OS_LINUX: frag = &inode.osd2.linux2.l_i_frag; fsize = &inode.osd2.linux2.l_i_fsize; break; case EXT2_OS_HURD: frag = &inode.osd2.hurd2.h_i_frag; fsize = &inode.osd2.hurd2.h_i_fsize; break; case EXT2_OS_MASIX: frag = &inode.osd2.masix2.m_i_frag; fsize = &inode.osd2.masix2.m_i_fsize; break; default: frag = fsize = 0; } if (frag) modify_u8(argv[0], "Fragment number", decimal_format, frag); if (fsize) modify_u8(argv[0], "Fragment size", decimal_format, fsize); for (i=0; i < EXT2_NDIR_BLOCKS; i++) { sprintf(buf, "Direct Block #%d", i); modify_u32(argv[0], buf, decimal_format, &inode.i_block[i]); } modify_u32(argv[0], "Indirect Block", decimal_format, &inode.i_block[EXT2_IND_BLOCK]); modify_u32(argv[0], "Double Indirect Block", decimal_format, &inode.i_block[EXT2_DIND_BLOCK]); modify_u32(argv[0], "Triple Indirect Block", decimal_format, &inode.i_block[EXT2_TIND_BLOCK]);#endif if (readonly) return; if (debugfs_write_inode(inode_num, &inode, filename)) return;}/* * This function will convert a string to an unsigned long, printing * an error message if it fails, and returning success or failure in err. */unsigned long parse_ulong(const char *str, const char *cmd, const char *descr, int *err){ char *tmp; unsigned long ret; ret = strtoul(str, &tmp, 0); if (*tmp == 0) { if (err) *err = 0; return ret; } com_err(cmd, 0, "Bad %s - %s", descr, str); if (err) *err = 1; else exit(1); return 0;}/* * This function will convert a string to a block number. It returns * 0 on success, 1 on failure. */int strtoblk(const char *cmd, const char *str, blk_t *ret){ blk_t blk; int err; blk = parse_ulong(str, cmd, "block number", &err); *ret = blk; if (err == 0 && blk == 0) { com_err(cmd, 0, "Invalid block number 0"); err = 1; } return err;}#ifdef MOD_EXEint main(int argc, char **argv){ int catastrophic = 0; blk_t superblock = 0; blk_t blocksize = 0; int open_flags = 0; char *file_path = NULL; char *dev_path = NULL; int c = 0; const char *usage = "Usage: chmod [-b blocksize] [-s superblock] [-f file] [-F] [-V] [-c] [-i] [-r] [-o device]"; unsigned long mode; char *tmp = NULL; int readonly = 0; open_flags |= EXT2_FLAG_RW; while ((c = getopt (argc, argv, "icRF:f:b:s:o:Vr")) != EOF) { switch (c) { case 'F': open_flags |= EXT2_FLAG_FORCE; break; case 'f': file_path = optarg; break; case 'i': open_flags |= EXT2_FLAG_IMAGE_FILE; break; case 'o': dev_path = optarg; break; case 'b': blocksize = parse_ulong(optarg, argv[0], "block size", 0); break; case 's': superblock = parse_ulong(optarg, argv[0], "superblock number", 0); break; case 'c': catastrophic = 1; break; case 'r': readonly = 1; break; case 'V': /* Print version number and exit */ fprintf(stderr, "\tUsing %s\n", error_message(EXT2_ET_BASE)); exit(0); default: com_err(argv[0], 0, usage); return 1; } } if (!file_path || !dev_path || (!readonly && !argv[optind])){ com_err(argv[0], 0, usage); return 1; } if (!readonly) { printf("Change Mode [%s] \n", argv[optind]); mode = strtoul(argv[optind], &tmp, 0); if (*tmp){ com_err(argv[0], 0, "Bad Mode value - %s", argv[optind]); return 1; } } open_filesystem(dev_path, open_flags, superblock, blocksize, catastrophic); if (!current_fs){ return 1; } do_modify_inode(readonly, file_path, mode); close_filesystem(); return 0;}#endif
                
               
              
             
            
           
          
         
        
       
      
     
    
   

参考:

e2fsprogs

MinGW

Msys