5 A part of the extended file system 2 disk editor.
7 --------------------------------
8 Various initialization routines.
9 --------------------------------
11 First written on: April 9 1995
13 Copyright (C) 1995 Gadi Oxman
27 #include <sys/types.h>
33 char lines_s [80],cols_s [80];
35 void signal_handler (void);
37 void prepare_to_close (void)
41 if (device_handle!=NULL)
42 fclose (device_handle);
43 free_user_commands (&general_commands);
44 free_user_commands (&ext2_commands);
45 free_struct_descriptors ();
51 printf ("Initializing ...\n");
53 if (!process_configuration_file ()) {
54 fprintf (stderr,"Error - Unable to complete configuration. Quitting.\n");
58 general_commands.last_command=-1; /* No commands whatsoever meanwhile */
59 ext2_commands.last_command=-1;
60 add_general_commands (); /* Add the general commands, available always */
61 device_handle=NULL; /* Notice that our device is still not set up */
63 current_type=NULL; /* No filesystem specific types yet */
65 remember_lifo.entries_count=0; /* Object memory is empty */
67 init_windows (); /* Initialize the NCURSES interface */
68 init_readline (); /* Initialize the READLINE interface */
69 init_signals (); /* Initialize the signal handlers */
70 write_access=0; /* Write access disabled */
72 strcpy (last_command_line,"help"); /* Show the help screen to the user */
74 return (1); /* Success */
77 void add_general_commands (void)
80 add_user_command (&general_commands,"help","EXT2ED help system",help);
81 add_user_command (&general_commands,"set","Changes a variable in the current object",set);
82 add_user_command (&general_commands,"setdevice","Selects the filesystem block device (e.g. /dev/hda1)",set_device);
83 add_user_command (&general_commands,"setoffset","Moves asynchronously in the filesystem",set_offset);
84 add_user_command (&general_commands,"settype","Tells EXT2ED how to interpret the current object",set_type);
85 add_user_command (&general_commands,"show","Displays the current object",show);
86 add_user_command (&general_commands,"pgup","Scrolls data one page up",pgup);
87 add_user_command (&general_commands,"pgdn","Scrolls data one page down",pgdn);
88 add_user_command (&general_commands,"redraw","Redisplay the screen",redraw);
89 add_user_command (&general_commands,"remember","Saves the current position and data information",remember);
90 add_user_command (&general_commands,"recall","Gets back to the saved object position",recall);
91 add_user_command (&general_commands,"enablewrite","Enters Read/Write mode - Allows changing the filesystem",enable_write);
92 add_user_command (&general_commands,"disablewrite","Enters read only mode",disable_write);
93 add_user_command (&general_commands,"writedata","Write data back to disk",write_data);
94 add_user_command (&general_commands,"next","Moves to the next byte in hex mode",next);
95 add_user_command (&general_commands,"prev","Moves to the previous byte in hex mode",prev);
98 void add_ext2_general_commands (void)
101 add_user_command (&ext2_commands,"super","Moves to the superblock of the filesystem",type_ext2___super);
102 add_user_command (&ext2_commands,"group","Moves to the first group descriptor",type_ext2___group);
103 add_user_command (&ext2_commands,"cd","Moves to the directory specified",type_ext2___cd);
106 int set_struct_descriptors (char *file_name)
110 char current_line [500],current_word [50],*ch;
111 char variable_name [50],variable_type [20];
112 struct struct_descriptor *current_descriptor;
114 if ( (fp=fopen (file_name,"rt"))==NULL) {
115 wprintw (command_win,"Error - Failed to open descriptors file %s\n",file_name);
116 refresh_command_win (); return (0);
120 fgets (current_line,500,fp);
121 if (feof (fp)) break;
122 ch=parse_word (current_line,current_word);
123 if (strcmp (current_word,"struct")==0) {
124 ch=parse_word (ch,current_word);
125 current_descriptor=add_new_descriptor (current_word);
127 while (strchr (current_line,'{')==NULL) {
128 fgets (current_line,500,fp);
129 if (feof (fp)) break;
131 if (feof (fp)) break;
133 fgets (current_line,500,fp);
135 while (strchr (current_line,'}')==NULL) {
136 while (strchr (current_line,';')==NULL) {
137 fgets (current_line,500,fp);
138 if (strchr (current_line,'}')!=NULL) break;
140 if (strchr (current_line,'}') !=NULL) break;
141 ch=parse_word (current_line,variable_type);
142 ch=parse_word (ch,variable_name);
143 while (variable_name [strlen (variable_name)-1]!=';') {
144 strcpy (variable_type,variable_name);
145 ch=parse_word (ch,variable_name);
147 variable_name [strlen (variable_name)-1]=0;
148 add_new_variable (current_descriptor,variable_type,variable_name);
149 fgets (current_line,500,fp);
158 void free_struct_descriptors (void)
161 struct struct_descriptor *ptr,*next;
166 free_user_commands (&ptr->type_commands);
170 first_type=last_type=current_type=NULL;
173 void free_user_commands (struct struct_commands *ptr)
178 for (i=0;i<=ptr->last_command;i++) {
179 free (ptr->names [i]);
180 free (ptr->descriptions [i]);
183 ptr->last_command=-1;
186 struct struct_descriptor *add_new_descriptor (char *name)
189 struct struct_descriptor *ptr;
191 ptr = malloc (sizeof (struct struct_descriptor));
193 printf ("Error - Can not allocate memory - Quitting\n");
196 memset(ptr, 0, sizeof(struct struct_descriptor));
197 ptr->prev = ptr->next = NULL;
198 strcpy (ptr->name,name);
201 if (first_type==NULL) {
202 first_type = last_type = ptr;
204 ptr->prev = last_type; last_type->next = ptr; last_type=ptr;
206 ptr->type_commands.last_command=-1;
207 fill_type_commands (ptr);
217 struct type_table type_table[] = {
218 { "long", FIELD_TYPE_INT, 4 },
219 { "short", FIELD_TYPE_INT, 2 },
220 { "char", FIELD_TYPE_CHAR, 1 },
221 { "__u32", FIELD_TYPE_UINT, 4 },
222 { "__s32", FIELD_TYPE_INT, 4 },
223 { "__u16", FIELD_TYPE_UINT, 2 },
224 { "__s16", FIELD_TYPE_INT, 2 },
225 { "__u8", FIELD_TYPE_UINT, 1 },
226 { "__s8", FIELD_TYPE_INT, 1 },
230 void add_new_variable (struct struct_descriptor *ptr,char *v_type,char *v_name)
234 char field_type=FIELD_TYPE_INT;
235 struct type_table *p;
237 strcpy (ptr->field_names [ptr->fields_num],v_name);
238 ptr->field_positions [ptr->fields_num]=ptr->length;
240 for (p = type_table; p->name; p++) {
241 if (strcmp(v_type, p->name) == 0) {
243 field_type = p->field_type;
248 if (strncmp(v_type, "char[", 5) == 0) {
249 len = atoi(v_type+5);
250 field_type = FIELD_TYPE_CHAR;
252 printf("Unknown type %s for field %s\n", v_type, v_name);
257 ptr->field_lengths [ptr->fields_num] = len;
258 ptr->field_types [ptr->fields_num] = field_type;
264 void fill_type_commands (struct struct_descriptor *ptr)
268 Set specific type user commands.
274 if (strcmp ((ptr->name),"file")==0) {
275 add_user_command (&ptr->type_commands,"show","Shows file data",type_file___show);
276 add_user_command (&ptr->type_commands,"inode","Returns to the inode of the current file",type_file___inode);
277 add_user_command (&ptr->type_commands,"display","Specifies data format - text or hex",type_file___display);
278 add_user_command (&ptr->type_commands,"next","Pass to next byte",type_file___next);
279 add_user_command (&ptr->type_commands,"prev","Pass to the previous byte",type_file___prev);
280 add_user_command (&ptr->type_commands,"offset","Pass to a specified byte in the current block",type_file___offset);
281 add_user_command (&ptr->type_commands,"nextblock","Pass to next file block",type_file___nextblock);
282 add_user_command (&ptr->type_commands,"prevblock","Pass to the previous file block",type_file___prevblock);
283 add_user_command (&ptr->type_commands,"block","Specify which file block to edit",type_file___block);
284 add_user_command (&ptr->type_commands,"remember","Saves the file\'s inode position for later reference",type_file___remember);
285 add_user_command (&ptr->type_commands,"set","Sets the current byte",type_file___set);
286 add_user_command (&ptr->type_commands,"writedata","Writes the current block to the disk",type_file___writedata);
289 if (strcmp ((ptr->name),"ext2_inode")==0) {
290 add_user_command (&ptr->type_commands,"show","Shows inode data",type_ext2_inode___show);
291 add_user_command (&ptr->type_commands,"next","Move to next inode in current block group",type_ext2_inode___next);
292 add_user_command (&ptr->type_commands,"prev","Move to next inode in current block group",type_ext2_inode___prev);
293 add_user_command (&ptr->type_commands,"group","Move to the group descriptors of the current inode table",type_ext2_inode___group);
294 add_user_command (&ptr->type_commands,"entry","Move to a specified entry in the current inode table",type_ext2_inode___entry);
295 add_user_command (&ptr->type_commands,"file","Display file data of the current inode",type_ext2_inode___file);
296 add_user_command (&ptr->type_commands,"dir","Display directory data of the current inode",type_ext2_inode___dir);
299 if (strcmp ((ptr->name),"dir")==0) {
300 add_user_command (&ptr->type_commands,"show","Shows current directory data",type_dir___show);
301 add_user_command (&ptr->type_commands,"inode","Returns to the inode of the current directory",type_dir___inode);
302 add_user_command (&ptr->type_commands,"next","Pass to the next directory entry",type_dir___next);
303 add_user_command (&ptr->type_commands,"prev","Pass to the previous directory entry",type_dir___prev);
304 add_user_command (&ptr->type_commands,"followinode","Follows the inode specified in this directory entry",type_dir___followinode);
305 add_user_command (&ptr->type_commands,"remember","Remember the inode of the current directory entry",type_dir___remember);
306 add_user_command (&ptr->type_commands,"cd","Changes directory relative to the current directory",type_dir___cd);
307 add_user_command (&ptr->type_commands,"entry","Moves to a specified entry in the current directory",type_dir___entry);
308 add_user_command (&ptr->type_commands,"writedata","Writes the current entry to the disk",type_dir___writedata);
309 add_user_command (&ptr->type_commands,"set","Changes a variable in the current directory entry",type_dir___set);
312 if (strcmp ((ptr->name),"ext2_super_block")==0) {
313 add_user_command (&ptr->type_commands,"show","Displays the super block data",type_ext2_super_block___show);
314 add_user_command (&ptr->type_commands,"gocopy","Move to another backup copy of the superblock",type_ext2_super_block___gocopy);
315 add_user_command (&ptr->type_commands,"setactivecopy","Copies the current superblock to the main superblock",type_ext2_super_block___setactivecopy);
318 if (strcmp ((ptr->name),"ext2_group_desc")==0) {
319 add_user_command (&ptr->type_commands,"next","Pass to the next block group descriptor",type_ext2_group_desc___next);
320 add_user_command (&ptr->type_commands,"prev","Pass to the previous group descriptor",type_ext2_group_desc___prev);
321 add_user_command (&ptr->type_commands,"entry","Pass to a specific group descriptor",type_ext2_group_desc___entry);
322 add_user_command (&ptr->type_commands,"show","Shows the current group descriptor",type_ext2_group_desc___show);
323 add_user_command (&ptr->type_commands,"inode","Pass to the inode table of the current group block",type_ext2_group_desc___inode);
324 add_user_command (&ptr->type_commands,"gocopy","Move to another backup copy of the group descriptor",type_ext2_group_desc___gocopy);
325 add_user_command (&ptr->type_commands,"blockbitmap","Show the block allocation bitmap of the current group block",type_ext2_group_desc___blockbitmap);
326 add_user_command (&ptr->type_commands,"inodebitmap","Show the inode allocation bitmap of the current group block",type_ext2_group_desc___inodebitmap);
327 add_user_command (&ptr->type_commands,"setactivecopy","Copies the current group descriptor to the main table",type_ext2_super_block___setactivecopy);
330 if (strcmp ((ptr->name),"block_bitmap")==0) {
331 add_user_command (&ptr->type_commands,"show","Displays the block allocation bitmap",type_ext2_block_bitmap___show);
332 add_user_command (&ptr->type_commands,"entry","Moves to a specific bit",type_ext2_block_bitmap___entry);
333 add_user_command (&ptr->type_commands,"next","Moves to the next bit",type_ext2_block_bitmap___next);
334 add_user_command (&ptr->type_commands,"prev","Moves to the previous bit",type_ext2_block_bitmap___prev);
335 add_user_command (&ptr->type_commands,"allocate","Allocates the current block",type_ext2_block_bitmap___allocate);
336 add_user_command (&ptr->type_commands,"deallocate","Deallocates the current block",type_ext2_block_bitmap___deallocate);
339 if (strcmp ((ptr->name),"inode_bitmap")==0) {
340 add_user_command (&ptr->type_commands,"show","Displays the inode allocation bitmap",type_ext2_inode_bitmap___show);
341 add_user_command (&ptr->type_commands,"entry","Moves to a specific bit",type_ext2_inode_bitmap___entry);
342 add_user_command (&ptr->type_commands,"next","Moves to the next bit",type_ext2_inode_bitmap___next);
343 add_user_command (&ptr->type_commands,"prev","Moves to the previous bit",type_ext2_inode_bitmap___prev);
344 add_user_command (&ptr->type_commands,"allocate","Allocates the current inode",type_ext2_inode_bitmap___allocate);
345 add_user_command (&ptr->type_commands,"deallocate","Deallocates the current inode",type_ext2_inode_bitmap___deallocate);
350 void add_user_command (struct struct_commands *ptr,char *name,char *description,PF callback)
355 num=ptr->last_command;
356 if (num+1==MAX_COMMANDS_NUM) {
357 printf ("Internal Error - Can't add command %s\n",name);
361 ptr->last_command=++num;
363 ptr->names [num]=(char *) malloc (strlen (name)+1);
364 strcpy (ptr->names [num],name);
366 if (*description!=0) {
367 ptr->descriptions [num]=(char *) malloc (strlen (description)+1);
368 strcpy (ptr->descriptions [num],description);
371 ptr->callback [num]=callback;
374 int set_file_system_info (void)
378 struct ext2_super_block *sb;
380 file_system_info.super_block_offset=1024;
381 file_system_info.file_system_size=DefaultTotalBlocks*DefaultBlockSize;
383 low_read ((char *) &file_system_info.super_block,sizeof (struct ext2_super_block),file_system_info.super_block_offset);
385 sb=&file_system_info.super_block;
387 if (sb->s_magic == EXT2_SUPER_MAGIC)
391 wprintw (command_win,"Detected extended 2 file system on device %s\n",device_name);
393 wprintw (command_win,"Warning - Extended 2 filesystem not detected on device %s\n",device_name);
395 if (!ext2_detected && !ForceExt2)
396 wprintw (command_win,"You may wish to use the configuration option ForceExt2 on\n");
398 if (ForceExt2 && !ext2_detected)
399 wprintw (command_win,"Forcing extended 2 filesystem\n");
401 if (ForceDefault || !ext2_detected)
402 wprintw (command_win,"Forcing default parameters\n");
404 refresh_command_win ();
406 if (ext2_detected || ForceExt2) {
407 add_ext2_general_commands ();
408 if (!set_struct_descriptors (Ext2Descriptors))
412 if (!ForceDefault && ext2_detected) {
414 file_system_info.block_size=EXT2_MIN_BLOCK_SIZE << sb->s_log_block_size;
415 if (file_system_info.block_size == EXT2_MIN_BLOCK_SIZE)
416 file_system_info.first_group_desc_offset=2*EXT2_MIN_BLOCK_SIZE;
418 file_system_info.first_group_desc_offset=file_system_info.block_size;
419 file_system_info.groups_count = ext2fs_div64_ceil(ext2fs_blocks_count(sb),
420 sb->s_blocks_per_group);
422 file_system_info.inodes_per_block=file_system_info.block_size/sizeof (struct ext2_inode);
423 file_system_info.blocks_per_group=sb->s_inodes_per_group/file_system_info.inodes_per_block;
424 file_system_info.no_blocks_in_group=sb->s_blocks_per_group;
425 file_system_info.file_system_size=(ext2fs_blocks_count(sb)-1)*file_system_info.block_size;
429 file_system_info.file_system_size=DefaultTotalBlocks*DefaultBlockSize;
430 file_system_info.block_size=DefaultBlockSize;
431 file_system_info.no_blocks_in_group=DefaultBlocksInGroup;
434 if (file_system_info.file_system_size > 2147483647) {
435 wprintw (command_win,"Sorry, filesystems bigger than 2 GB are currently not supported\n");
441 void init_readline (void)
445 rl_completion_entry_function=(Function *) complete_command;
449 void init_signals (void)
452 signal (SIGWINCH, signal_SIGWINCH_handler); /* Catch SIGWINCH */
453 signal (SIGTERM, signal_SIGTERM_handler);
454 signal (SIGSEGV, signal_SIGSEGV_handler);
458 void signal_SIGWINCH_handler (int sig_num)
461 redraw_request=1; /* We will handle it in main.c */
463 /* Reset signal handler */
464 signal (SIGWINCH, signal_SIGWINCH_handler);
468 void signal_SIGTERM_handler (int sig_num)
472 printf ("Terminated due to signal %d\n",sig_num);
476 void signal_SIGSEGV_handler (int sig_num)
480 printf ("Killed by signal %d!\n",sig_num);
484 int process_configuration_file (void)
488 char option [80],value [80];
491 strcpy (buffer, ROOT_SYSCONFDIR);
492 strcat (buffer,"/ext2ed.conf");
494 if ((fp=fopen (buffer,"rt"))==NULL) {
495 fprintf (stderr,"Error - Unable to open configuration file %s\n",buffer);
499 while (get_next_option (fp,option,value)) {
500 if (strcasecmp (option,"Ext2Descriptors")==0) {
501 strcpy (Ext2Descriptors,value);
504 else if (strcasecmp (option,"AlternateDescriptors")==0) {
505 strcpy (AlternateDescriptors,value);
508 else if (strcasecmp (option,"LogFile")==0) {
509 strcpy (LogFile,value);
512 else if (strcasecmp (option,"LogChanges")==0) {
513 if (strcasecmp (value,"on")==0)
515 else if (strcasecmp (value,"off")==0)
518 fprintf (stderr,"Error - Illegal value: %s %s\n",option,value);
519 fclose (fp);return (0);
523 else if (strcasecmp (option,"AllowChanges")==0) {
524 if (strcasecmp (value,"on")==0)
526 else if (strcasecmp (value,"off")==0)
529 fprintf (stderr,"Error - Illegal value: %s %s\n",option,value);
530 fclose (fp);return (0);
534 else if (strcasecmp (option,"AllowMountedRead")==0) {
535 if (strcasecmp (value,"on")==0)
536 AllowMountedRead = 1;
537 else if (strcasecmp (value,"off")==0)
538 AllowMountedRead = 0;
540 fprintf (stderr,"Error - Illegal value: %s %s\n",option,value);
541 fclose (fp);return (0);
545 else if (strcasecmp (option,"ForceExt2")==0) {
546 if (strcasecmp (value,"on")==0)
548 else if (strcasecmp (value,"off")==0)
551 fprintf (stderr,"Error - Illegal value: %s %s\n",option,value);
552 fclose (fp);return (0);
556 else if (strcasecmp (option,"DefaultBlockSize")==0) {
557 DefaultBlockSize = atoi (value);
560 else if (strcasecmp (option,"DefaultTotalBlocks")==0) {
561 DefaultTotalBlocks = strtoul (value,NULL,10);
564 else if (strcasecmp (option,"DefaultBlocksInGroup")==0) {
565 DefaultBlocksInGroup = strtoul (value,NULL,10);
568 else if (strcasecmp (option,"ForceDefault")==0) {
569 if (strcasecmp (value,"on")==0)
571 else if (strcasecmp (value,"off")==0)
574 fprintf (stderr,"Error - Illegal value: %s %s\n",option,value);
575 fclose (fp);return (0);
580 fprintf (stderr,"Error - Unknown option: %s\n",option);
581 fclose (fp);return (0);
585 printf ("Configuration completed\n");
590 int get_next_option (FILE *fp,char *option,char *value)
596 if (feof (fp)) return (0);
598 if (feof (fp)) return (0);
599 fgets (buffer,500,fp);
600 } while (buffer [0]=='#' || buffer [0]=='\n');
602 ptr=parse_word (buffer,option);
603 ptr=parse_word (ptr,value);
607 void check_mounted (char *name)
612 char current_line [500],current_word [200];
616 if ( (fp=fopen ("/etc/mtab","rt"))==NULL) {
617 wprintw (command_win,"Error - Failed to open /etc/mtab. Assuming filesystem is mounted.\n");
618 refresh_command_win ();mounted=1;return;
622 fgets (current_line,500,fp);
623 if (feof (fp)) break;
624 ptr=parse_word (current_line,current_word);
625 if (strcasecmp (current_word,name)==0) {
626 mounted=1;fclose (fp);return;