source: MondoRescue/branches/2.2.5/mindi-busybox/miscutils/devfsd.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 54.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4 */
5
6/*
7 devfsd implementation for busybox
8
9 Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
10
11 Busybox version is based on some previous work and ideas
12 Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it>
13
14 devfsd.c
15
16 Main file for devfsd (devfs daemon for Linux).
17
18 Copyright (C) 1998-2002 Richard Gooch
19
20 devfsd.h
21
22 Header file for devfsd (devfs daemon for Linux).
23
24 Copyright (C) 1998-2000 Richard Gooch
25
26 compat_name.c
27
28 Compatibility name file for devfsd (build compatibility names).
29
30 Copyright (C) 1998-2002 Richard Gooch
31
32 expression.c
33
34 This code provides Borne Shell-like expression expansion.
35
36 Copyright (C) 1997-1999 Richard Gooch
37
38 This program is free software; you can redistribute it and/or modify
39 it under the terms of the GNU General Public License as published by
40 the Free Software Foundation; either version 2 of the License, or
41 (at your option) any later version.
42
43 This program is distributed in the hope that it will be useful,
44 but WITHOUT ANY WARRANTY; without even the implied warranty of
45 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
46 GNU General Public License for more details.
47
48 You should have received a copy of the GNU General Public License
49 along with this program; if not, write to the Free Software
50 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
51
52 Richard Gooch may be reached by email at rgooch@atnf.csiro.au
53 The postal address is:
54 Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
55*/
56
57//#include <sys/wait.h>
58//#include <sys/ioctl.h>
59//#include <sys/socket.h>
60#include <sys/un.h>
61#include <dirent.h>
62#include <syslog.h>
63#include <sys/sysmacros.h>
64#include "libbb.h"
65#include "xregex.h"
66
67
68/* Various defines taken from linux/major.h */
69#define IDE0_MAJOR 3
70#define IDE1_MAJOR 22
71#define IDE2_MAJOR 33
72#define IDE3_MAJOR 34
73#define IDE4_MAJOR 56
74#define IDE5_MAJOR 57
75#define IDE6_MAJOR 88
76#define IDE7_MAJOR 89
77#define IDE8_MAJOR 90
78#define IDE9_MAJOR 91
79
80
81/* Various defines taken from linux/devfs_fs.h */
82#define DEVFSD_PROTOCOL_REVISION_KERNEL 5
83#define DEVFSD_IOCTL_BASE 'd'
84/* These are the various ioctls */
85#define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int)
86#define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int)
87#define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int)
88#define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int)
89#define DEVFSD_NOTIFY_REGISTERED 0
90#define DEVFSD_NOTIFY_UNREGISTERED 1
91#define DEVFSD_NOTIFY_ASYNC_OPEN 2
92#define DEVFSD_NOTIFY_CLOSE 3
93#define DEVFSD_NOTIFY_LOOKUP 4
94#define DEVFSD_NOTIFY_CHANGE 5
95#define DEVFSD_NOTIFY_CREATE 6
96#define DEVFSD_NOTIFY_DELETE 7
97#define DEVFS_PATHLEN 1024
98/* Never change this otherwise the binary interface will change */
99
100struct devfsd_notify_struct
101{ /* Use native C types to ensure same types in kernel and user space */
102 unsigned int type; /* DEVFSD_NOTIFY_* value */
103 unsigned int mode; /* Mode of the inode or device entry */
104 unsigned int major; /* Major number of device entry */
105 unsigned int minor; /* Minor number of device entry */
106 unsigned int uid; /* Uid of process, inode or device entry */
107 unsigned int gid; /* Gid of process, inode or device entry */
108 unsigned int overrun_count; /* Number of lost events */
109 unsigned int namelen; /* Number of characters not including '\0' */
110 /* The device name MUST come last */
111 char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */
112};
113
114#define BUFFER_SIZE 16384
115#define DEVFSD_VERSION "1.3.25"
116#define CONFIG_FILE "/etc/devfsd.conf"
117#define MODPROBE "/sbin/modprobe"
118#define MODPROBE_SWITCH_1 "-k"
119#define MODPROBE_SWITCH_2 "-C"
120#define CONFIG_MODULES_DEVFS "/etc/modules.devfs"
121#define MAX_ARGS (6 + 1)
122#define MAX_SUBEXPR 10
123#define STRING_LENGTH 255
124
125/* for get_uid_gid() */
126#define UID 0
127#define GID 1
128
129/* fork_and_execute() */
130# define DIE 1
131# define NO_DIE 0
132
133/* for dir_operation() */
134#define RESTORE 0
135#define SERVICE 1
136#define READ_CONFIG 2
137
138/* Update only after changing code to reflect new protocol */
139#define DEVFSD_PROTOCOL_REVISION_DAEMON 5
140
141/* Compile-time check */
142#if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
143#error protocol version mismatch. Update your kernel headers
144#endif
145
146#define AC_PERMISSIONS 0
147#define AC_MODLOAD 1
148#define AC_EXECUTE 2
149#define AC_MFUNCTION 3 /* not supported by busybox */
150#define AC_CFUNCTION 4 /* not supported by busybox */
151#define AC_COPY 5
152#define AC_IGNORE 6
153#define AC_MKOLDCOMPAT 7
154#define AC_MKNEWCOMPAT 8
155#define AC_RMOLDCOMPAT 9
156#define AC_RMNEWCOMPAT 10
157#define AC_RESTORE 11
158
159struct permissions_type
160{
161 mode_t mode;
162 uid_t uid;
163 gid_t gid;
164};
165
166struct execute_type
167{
168 char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
169};
170
171struct copy_type
172{
173 const char *source;
174 const char *destination;
175};
176
177struct action_type
178{
179 unsigned int what;
180 unsigned int when;
181};
182
183struct config_entry_struct
184{
185 struct action_type action;
186 regex_t preg;
187 union
188 {
189 struct permissions_type permissions;
190 struct execute_type execute;
191 struct copy_type copy;
192 }
193 u;
194 struct config_entry_struct *next;
195};
196
197struct get_variable_info
198{
199 const struct devfsd_notify_struct *info;
200 const char *devname;
201 char devpath[STRING_LENGTH];
202};
203
204static void dir_operation(int , const char * , int, unsigned long*);
205static void service(struct stat statbuf, char *path);
206static int st_expr_expand(char *, unsigned, const char *, const char *(*)(const char *, void *), void *);
207static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
208static int mksymlink(const char *oldpath, const char *newpath);
209static void read_config_file(char *path, int optional, unsigned long *event_mask);
210static void process_config_line(const char *, unsigned long *);
211static int do_servicing(int, unsigned long);
212static void service_name(const struct devfsd_notify_struct *);
213static void action_permissions(const struct devfsd_notify_struct *, const struct config_entry_struct *);
214static void action_execute(const struct devfsd_notify_struct *, const struct config_entry_struct *,
215 const regmatch_t *, unsigned);
216static void action_modload(const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
217static void action_copy(const struct devfsd_notify_struct *, const struct config_entry_struct *,
218 const regmatch_t *, unsigned);
219static void action_compat(const struct devfsd_notify_struct *, unsigned);
220static void free_config(void);
221static void restore(char *spath, struct stat source_stat, int rootlen);
222static int copy_inode(const char *, const struct stat *, mode_t, const char *, const struct stat *);
223static mode_t get_mode(const char *);
224static void signal_handler(int);
225static const char *get_variable(const char *, void *);
226static int make_dir_tree(const char *);
227static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
228 const char *, const regmatch_t *, unsigned);
229static void expand_regexp(char *, size_t, const char *, const char *, const regmatch_t *, unsigned);
230static const char *expand_variable( char *, unsigned, unsigned *, const char *,
231 const char *(*)(const char *, void *), void *);
232static const char *get_variable_v2(const char *, const char *(*)(const char *, void *), void *);
233static char get_old_ide_name(unsigned , unsigned);
234static char *write_old_sd_name(char *, unsigned, unsigned, const char *);
235
236/* busybox functions */
237static int get_uid_gid(int flag, const char *string);
238static void safe_memcpy(char * dest, const char * src, int len);
239static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr);
240static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr);
241
242/* Structs and vars */
243static struct config_entry_struct *first_config = NULL;
244static struct config_entry_struct *last_config = NULL;
245static char *mount_point = NULL;
246static volatile int caught_signal = FALSE;
247static volatile int caught_sighup = FALSE;
248static struct initial_symlink_struct {
249 const char *dest;
250 const char *name;
251} initial_symlinks[] = {
252 {"/proc/self/fd", "fd"},
253 {"fd/0", "stdin"},
254 {"fd/1", "stdout"},
255 {"fd/2", "stderr"},
256 {NULL, NULL},
257};
258
259static struct event_type {
260 unsigned int type; /* The DEVFSD_NOTIFY_* value */
261 const char *config_name; /* The name used in the config file */
262} event_types[] = {
263 {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
264 {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
265 {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
266 {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
267 {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
268 {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
269 {DEVFSD_NOTIFY_CREATE, "CREATE"},
270 {DEVFSD_NOTIFY_DELETE, "DELETE"},
271 {0xffffffff, NULL}
272};
273
274/* Busybox messages */
275
276static const char bb_msg_proto_rev[] ALIGN1 = "protocol revision";
277static const char bb_msg_bad_config[] ALIGN1 = "bad %s config file: %s";
278static const char bb_msg_small_buffer[] ALIGN1 = "buffer too small";
279static const char bb_msg_variable_not_found[] ALIGN1 = "variable: %s not found";
280
281/* Busybox stuff */
282#if ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG
283#define info_logger(p, fmt, args...) bb_info_msg(fmt, ## args)
284#define msg_logger(p, fmt, args...) bb_error_msg(fmt, ## args)
285#define msg_logger_and_die(p, fmt, args...) bb_error_msg_and_die(fmt, ## args)
286#define error_logger(p, fmt, args...) bb_perror_msg(fmt, ## args)
287#define error_logger_and_die(p, fmt, args...) bb_perror_msg_and_die(fmt, ## args)
288#else
289#define info_logger(p, fmt, args...)
290#define msg_logger(p, fmt, args...)
291#define msg_logger_and_die(p, fmt, args...) exit(1)
292#define error_logger(p, fmt, args...)
293#define error_logger_and_die(p, fmt, args...) exit(1)
294#endif
295
296static void safe_memcpy(char *dest, const char *src, int len)
297{
298 memcpy(dest , src, len);
299 dest[len] = '\0';
300}
301
302static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr)
303{
304 if (d[n - 4] == 'd' && d[n - 3] == 'i' && d[n - 2] == 's' && d[n - 1] == 'c')
305 return 2 + addendum;
306 if (d[n - 2] == 'c' && d[n - 1] == 'd')
307 return 3 + addendum;
308 if (ptr[0] == 'p' && ptr[1] == 'a' && ptr[2] == 'r' && ptr[3] == 't')
309 return 4 + addendum;
310 if (ptr[n - 2] == 'm' && ptr[n - 1] == 't')
311 return 5 + addendum;
312 return 0;
313}
314
315static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr)
316{
317 if (d[0] == 's' && d[1] == 'c' && d[2] == 's' && d[3] == 'i' && d[4] == '/') {
318 if (d[n - 7] == 'g' && d[n - 6] == 'e' && d[n - 5] == 'n'
319 && d[n - 4] == 'e' && d[n - 3] == 'r' && d[n - 2] == 'i' && d[n - 1] == 'c'
320 )
321 return 1;
322 return scan_dev_name_common(d, n, 0, ptr);
323 }
324 if (d[0] == 'i' && d[1] == 'd' && d[2] == 'e' && d[3] == '/'
325 && d[4] == 'h' && d[5] == 'o' && d[6] == 's' && d[7] == 't'
326 )
327 return scan_dev_name_common(d, n, 4, ptr);
328 if (d[0] == 's' && d[1] == 'b' && d[2] == 'p' && d[3] == '/')
329 return 10;
330 if (d[0] == 'v' && d[1] == 'c' && d[2] == 'c' && d[3] == '/')
331 return 11;
332 if (d[0] == 'p' && d[1] == 't' && d[2] == 'y' && d[3] == '/')
333 return 12;
334 return 0;
335}
336
337/* Public functions follow */
338
339int devfsd_main(int argc, char **argv);
340int devfsd_main(int argc, char **argv)
341{
342 int print_version = FALSE;
343 int do_daemon = TRUE;
344 int no_polling = FALSE;
345 int do_scan;
346 int fd, proto_rev, count;
347 unsigned long event_mask = 0;
348 struct sigaction new_action;
349 struct initial_symlink_struct *curr;
350
351 if (argc < 2)
352 bb_show_usage();
353
354 for (count = 2; count < argc; ++count) {
355 if (argv[count][0] == '-') {
356 if (argv[count][1] == 'v' && !argv[count][2]) /* -v */
357 print_version = TRUE;
358 else if (ENABLE_DEVFSD_FG_NP && argv[count][1] == 'f'
359 && argv[count][2] == 'g' && !argv[count][3]) /* -fg */
360 do_daemon = FALSE;
361 else if (ENABLE_DEVFSD_FG_NP && argv[count][1] == 'n'
362 && argv[count][2] == 'p' && !argv[count][3]) /* -np */
363 no_polling = TRUE;
364 else
365 bb_show_usage();
366 }
367 }
368
369 mount_point = bb_simplify_path(argv[1]);
370
371 xchdir(mount_point);
372
373 fd = xopen(".devfsd", O_RDONLY);
374
375 if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
376 bb_perror_msg_and_die("FD_CLOEXEC");
377
378 xioctl(fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev);
379
380 /*setup initial entries */
381 for (curr = initial_symlinks; curr->dest != NULL; ++curr)
382 symlink(curr->dest, curr->name);
383
384 /* NB: The check for CONFIG_FILE is done in read_config_file() */
385
386 if (print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)) {
387 printf("%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
388 applet_name, DEVFSD_VERSION, bb_msg_proto_rev,
389 DEVFSD_PROTOCOL_REVISION_DAEMON, bb_msg_proto_rev, proto_rev);
390 if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
391 bb_error_msg_and_die("%s mismatch!", bb_msg_proto_rev);
392 exit(EXIT_SUCCESS); /* -v */
393 }
394 /* Tell kernel we are special(i.e. we get to see hidden entries) */
395 xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
396
397 sigemptyset(&new_action.sa_mask);
398 new_action.sa_flags = 0;
399
400 /* Set up SIGHUP and SIGUSR1 handlers */
401 new_action.sa_handler = signal_handler;
402 if (sigaction(SIGHUP, &new_action, NULL) != 0 || sigaction(SIGUSR1, &new_action, NULL) != 0)
403 bb_error_msg_and_die("sigaction");
404
405 printf("%s v%s started for %s\n",applet_name, DEVFSD_VERSION, mount_point);
406
407 /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
408 umask(0);
409 read_config_file((char*)CONFIG_FILE, FALSE, &event_mask);
410 /* Do the scan before forking, so that boot scripts see the finished product */
411 dir_operation(SERVICE, mount_point, 0, NULL);
412
413 if (ENABLE_DEVFSD_FG_NP && no_polling)
414 exit(0);
415
416 if (ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG)
417 logmode = LOGMODE_BOTH;
418 else if (do_daemon == TRUE)
419 logmode = LOGMODE_SYSLOG;
420 /* This is the default */
421 /*else
422 logmode = LOGMODE_STDIO; */
423
424 if (do_daemon) {
425 /* Release so that the child can grab it */
426 xioctl(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
427 bb_daemonize_or_rexec(0, argv);
428 } else if (ENABLE_DEVFSD_FG_NP) {
429 setpgid(0, 0); /* Become process group leader */
430 }
431
432 while (TRUE) {
433 do_scan = do_servicing(fd, event_mask);
434
435 free_config();
436 read_config_file((char*)CONFIG_FILE, FALSE, &event_mask);
437 if (do_scan)
438 dir_operation(SERVICE, mount_point, 0, NULL);
439 }
440 if (ENABLE_FEATURE_CLEAN_UP) free(mount_point);
441} /* End Function main */
442
443
444/* Private functions follow */
445
446static void read_config_file(char *path, int optional, unsigned long *event_mask)
447/* [SUMMARY] Read a configuration database.
448 <path> The path to read the database from. If this is a directory, all
449 entries in that directory will be read(except hidden entries).
450 <optional> If TRUE, the routine will silently ignore a missing config file.
451 <event_mask> The event mask is written here. This is not initialised.
452 [RETURNS] Nothing.
453*/
454{
455 struct stat statbuf;
456 FILE *fp;
457 char buf[STRING_LENGTH];
458 char *line = NULL;
459 char *p;
460
461 if (stat(path, &statbuf) == 0) {
462 /* Don't read 0 length files: ignored */
463 /*if (statbuf.st_size == 0)
464 return;*/
465 if (S_ISDIR(statbuf.st_mode)) {
466 p = bb_simplify_path(path);
467 dir_operation(READ_CONFIG, p, 0, event_mask);
468 free(p);
469 return;
470 }
471 if ((fp = fopen(path, "r")) != NULL) {
472 while (fgets(buf, STRING_LENGTH, fp) != NULL) {
473 /* Skip whitespace */
474 line = buf;
475 line = skip_whitespace(line);
476 if (line[0] == '\0' || line[0] == '#')
477 continue;
478 process_config_line(line, event_mask);
479 }
480 fclose(fp);
481 } else {
482 goto read_config_file_err;
483 }
484 } else {
485read_config_file_err:
486 if (optional == 0 && errno == ENOENT)
487 error_logger_and_die(LOG_ERR, "read config file: %s", path);
488 }
489} /* End Function read_config_file */
490
491static void process_config_line(const char *line, unsigned long *event_mask)
492/* [SUMMARY] Process a line from a configuration file.
493 <line> The configuration line.
494 <event_mask> The event mask is written here. This is not initialised.
495 [RETURNS] Nothing.
496*/
497{
498 int num_args, count;
499 struct config_entry_struct *new;
500 char p[MAX_ARGS][STRING_LENGTH];
501 char when[STRING_LENGTH], what[STRING_LENGTH];
502 char name[STRING_LENGTH];
503 const char *msg = "";
504 char *ptr;
505 int i;
506
507 /* !!!! Only Uppercase Keywords in devsfd.conf */
508 static const char options[] ALIGN1 =
509 "CLEAR_CONFIG\0""INCLUDE\0""OPTIONAL_INCLUDE\0"
510 "RESTORE\0""PERMISSIONS\0""MODLOAD\0""EXECUTE\0"
511 "COPY\0""IGNORE\0""MKOLDCOMPAT\0""MKNEWCOMPAT\0"
512 "RMOLDCOMPAT\0""RMNEWCOMPAT\0";
513
514 for (count = 0; count < MAX_ARGS; ++count)
515 p[count][0] = '\0';
516 num_args = sscanf(line, "%s %s %s %s %s %s %s %s %s %s",
517 when, name, what,
518 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
519
520 i = index_in_strings(options, when);
521
522 /* "CLEAR_CONFIG" */
523 if (i == 0) {
524 free_config();
525 *event_mask = 0;
526 return;
527 }
528
529 if (num_args < 2)
530 goto process_config_line_err;
531
532 /* "INCLUDE" & "OPTIONAL_INCLUDE" */
533 if (i == 1 || i == 2) {
534 st_expr_expand(name, STRING_LENGTH, name, get_variable, NULL);
535 info_logger(LOG_INFO, "%sinclude: %s", (toupper(when[0]) == 'I') ? "": "optional_", name);
536 read_config_file(name, (toupper(when[0]) == 'I') ? FALSE : TRUE, event_mask);
537 return;
538 }
539 /* "RESTORE" */
540 if (i == 3) {
541 dir_operation(RESTORE, name, strlen(name),NULL);
542 return;
543 }
544 if (num_args < 3)
545 goto process_config_line_err;
546
547 new = xzalloc(sizeof *new);
548
549 for (count = 0; event_types[count].config_name != NULL; ++count) {
550 if (strcasecmp(when, event_types[count].config_name) != 0)
551 continue;
552 new->action.when = event_types[count].type;
553 break;
554 }
555 if (event_types[count].config_name == NULL) {
556 msg = "WHEN in";
557 goto process_config_line_err;
558 }
559
560 i = index_in_strings(options, what);
561
562 switch (i) {
563 case 4: /* "PERMISSIONS" */
564 new->action.what = AC_PERMISSIONS;
565 /* Get user and group */
566 if ((ptr = strchr(p[0], '.')) == NULL) {
567 msg = "UID.GID";
568 goto process_config_line_err; /*"missing '.' in UID.GID"*/
569 }
570
571 *ptr++ = '\0';
572 new->u.permissions.uid = get_uid_gid(UID, p[0]);
573 new->u.permissions.gid = get_uid_gid(GID, ptr);
574 /* Get mode */
575 new->u.permissions.mode = get_mode(p[1]);
576 break;
577 case 5: /* MODLOAD */
578 /*This action will pass "/dev/$devname"(i.e. "/dev/" prefixed to
579 the device name) to the module loading facility. In addition,
580 the /etc/modules.devfs configuration file is used.*/
581 if (ENABLE_DEVFSD_MODLOAD)
582 new->action.what = AC_MODLOAD;
583 break;
584 case 6: /* EXECUTE */
585 new->action.what = AC_EXECUTE;
586 num_args -= 3;
587
588 for (count = 0; count < num_args; ++count)
589 new->u.execute.argv[count] = xstrdup(p[count]);
590
591 new->u.execute.argv[num_args] = NULL;
592 break;
593 case 7: /* COPY */
594 new->action.what = AC_COPY;
595 num_args -= 3;
596 if (num_args != 2)
597 goto process_config_line_err; /* missing path and function in line */
598
599 new->u.copy.source = xstrdup(p[0]);
600 new->u.copy.destination = xstrdup(p[1]);
601 break;
602 case 8: /* IGNORE */
603 /* FALLTROUGH */
604 case 9: /* MKOLDCOMPAT */
605 /* FALLTROUGH */
606 case 10: /* MKNEWCOMPAT */
607 /* FALLTROUGH */
608 case 11:/* RMOLDCOMPAT */
609 /* FALLTROUGH */
610 case 12: /* RMNEWCOMPAT */
611 /* AC_IGNORE 6
612 AC_MKOLDCOMPAT 7
613 AC_MKNEWCOMPAT 8
614 AC_RMOLDCOMPAT 9
615 AC_RMNEWCOMPAT 10*/
616 new->action.what = i - 2;
617 break;
618 default:
619 msg = "WHAT in";
620 goto process_config_line_err;
621 /*esac*/
622 } /* switch (i) */
623
624 xregcomp(&new->preg, name, REG_EXTENDED);
625
626 *event_mask |= 1 << new->action.when;
627 new->next = NULL;
628 if (first_config == NULL)
629 first_config = new;
630 else
631 last_config->next = new;
632 last_config = new;
633 return;
634
635 process_config_line_err:
636 msg_logger_and_die(LOG_ERR, bb_msg_bad_config, msg , line);
637} /* End Function process_config_line */
638
639static int do_servicing(int fd, unsigned long event_mask)
640/* [SUMMARY] Service devfs changes until a signal is received.
641 <fd> The open control file.
642 <event_mask> The event mask.
643 [RETURNS] TRUE if SIGHUP was caught, else FALSE.
644*/
645{
646 ssize_t bytes;
647 struct devfsd_notify_struct info;
648
649 /* (void*) cast is only in order to match prototype */
650 xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, (void*)event_mask);
651 while (!caught_signal) {
652 errno = 0;
653 bytes = read(fd,(char *) &info, sizeof info);
654 if (caught_signal)
655 break; /* Must test for this first */
656 if (errno == EINTR)
657 continue; /* Yes, the order is important */
658 if (bytes < 1)
659 break;
660 service_name(&info);
661 }
662 if (caught_signal) {
663 int c_sighup = caught_sighup;
664
665 caught_signal = FALSE;
666 caught_sighup = FALSE;
667 return c_sighup;
668 }
669 msg_logger_and_die(LOG_ERR, "read error on control file");
670} /* End Function do_servicing */
671
672static void service_name(const struct devfsd_notify_struct *info)
673/* [SUMMARY] Service a single devfs change.
674 <info> The devfs change.
675 [RETURNS] Nothing.
676*/
677{
678 unsigned int n;
679 regmatch_t mbuf[MAX_SUBEXPR];
680 struct config_entry_struct *entry;
681
682 if (ENABLE_DEBUG && info->overrun_count > 0)
683 msg_logger(LOG_ERR, "lost %u events", info->overrun_count);
684
685 /* Discard lookups on "/dev/log" and "/dev/initctl" */
686 if (info->type == DEVFSD_NOTIFY_LOOKUP
687 && ((info->devname[0] == 'l' && info->devname[1] == 'o'
688 && info->devname[2] == 'g' && !info->devname[3])
689 || (info->devname[0] == 'i' && info->devname[1] == 'n'
690 && info->devname[2] == 'i' && info->devname[3] == 't'
691 && info->devname[4] == 'c' && info->devname[5] == 't'
692 && info->devname[6] == 'l' && !info->devname[7]))
693 )
694 return;
695
696 for (entry = first_config; entry != NULL; entry = entry->next) {
697 /* First check if action matches the type, then check if name matches */
698 if (info->type != entry->action.when
699 || regexec(&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0)
700 continue;
701 for (n = 0;(n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
702 /* VOID */;
703
704 switch (entry->action.what) {
705 case AC_PERMISSIONS:
706 action_permissions(info, entry);
707 break;
708 case AC_MODLOAD:
709 if (ENABLE_DEVFSD_MODLOAD)
710 action_modload(info, entry);
711 break;
712 case AC_EXECUTE:
713 action_execute(info, entry, mbuf, n);
714 break;
715 case AC_COPY:
716 action_copy(info, entry, mbuf, n);
717 break;
718 case AC_IGNORE:
719 return;
720 /*break;*/
721 case AC_MKOLDCOMPAT:
722 case AC_MKNEWCOMPAT:
723 case AC_RMOLDCOMPAT:
724 case AC_RMNEWCOMPAT:
725 action_compat(info, entry->action.what);
726 break;
727 default:
728 msg_logger_and_die(LOG_ERR, "Unknown action");
729 }
730 }
731} /* End Function service_name */
732
733static void action_permissions(const struct devfsd_notify_struct *info,
734 const struct config_entry_struct *entry)
735/* [SUMMARY] Update permissions for a device entry.
736 <info> The devfs change.
737 <entry> The config file entry.
738 [RETURNS] Nothing.
739*/
740{
741 struct stat statbuf;
742
743 if (stat(info->devname, &statbuf) != 0
744 || chmod(info->devname, (statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0
745 || chown(info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0
746 )
747 error_logger(LOG_ERR, "Can't chmod or chown: %s", info->devname);
748} /* End Function action_permissions */
749
750static void action_modload(const struct devfsd_notify_struct *info,
751 const struct config_entry_struct *entry ATTRIBUTE_UNUSED)
752/* [SUMMARY] Load a module.
753 <info> The devfs change.
754 <entry> The config file entry.
755 [RETURNS] Nothing.
756*/
757{
758 char *argv[6];
759
760 argv[0] = (char*)MODPROBE;
761 argv[1] = (char*)MODPROBE_SWITCH_1; /* "-k" */
762 argv[2] = (char*)MODPROBE_SWITCH_2; /* "-C" */
763 argv[3] = (char*)CONFIG_MODULES_DEVFS;
764 argv[4] = concat_path_file("/dev", info->devname); /* device */
765 argv[5] = NULL;
766
767 wait4pid(xspawn(argv));
768 free(argv[4]);
769} /* End Function action_modload */
770
771static void action_execute(const struct devfsd_notify_struct *info,
772 const struct config_entry_struct *entry,
773 const regmatch_t *regexpr, unsigned int numexpr)
774/* [SUMMARY] Execute a programme.
775 <info> The devfs change.
776 <entry> The config file entry.
777 <regexpr> The number of subexpression(start, end) offsets within the
778 device name.
779 <numexpr> The number of elements within <<regexpr>>.
780 [RETURNS] Nothing.
781*/
782{
783 unsigned int count;
784 struct get_variable_info gv_info;
785 char *argv[MAX_ARGS + 1];
786 char largv[MAX_ARGS + 1][STRING_LENGTH];
787
788 gv_info.info = info;
789 gv_info.devname = info->devname;
790 snprintf(gv_info.devpath, sizeof(gv_info.devpath), "%s/%s", mount_point, info->devname);
791 for (count = 0; entry->u.execute.argv[count] != NULL; ++count) {
792 expand_expression(largv[count], STRING_LENGTH,
793 entry->u.execute.argv[count],
794 get_variable, &gv_info,
795 gv_info.devname, regexpr, numexpr);
796 argv[count] = largv[count];
797 }
798 argv[count] = NULL;
799 wait4pid(spawn(argv));
800} /* End Function action_execute */
801
802
803static void action_copy(const struct devfsd_notify_struct *info,
804 const struct config_entry_struct *entry,
805 const regmatch_t *regexpr, unsigned int numexpr)
806/* [SUMMARY] Copy permissions.
807 <info> The devfs change.
808 <entry> The config file entry.
809 <regexpr> This list of subexpression(start, end) offsets within the
810 device name.
811 <numexpr> The number of elements in <<regexpr>>.
812 [RETURNS] Nothing.
813*/
814{
815 mode_t new_mode;
816 struct get_variable_info gv_info;
817 struct stat source_stat, dest_stat;
818 char source[STRING_LENGTH], destination[STRING_LENGTH];
819 int ret = 0;
820
821 dest_stat.st_mode = 0;
822
823 if ((info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK(info->mode))
824 return;
825 gv_info.info = info;
826 gv_info.devname = info->devname;
827
828 snprintf(gv_info.devpath, sizeof(gv_info.devpath), "%s/%s", mount_point, info->devname);
829 expand_expression(source, STRING_LENGTH, entry->u.copy.source,
830 get_variable, &gv_info, gv_info.devname,
831 regexpr, numexpr);
832
833 expand_expression(destination, STRING_LENGTH, entry->u.copy.destination,
834 get_variable, &gv_info, gv_info.devname,
835 regexpr, numexpr);
836
837 if (!make_dir_tree(destination) || lstat(source, &source_stat) != 0)
838 return;
839 lstat(destination, &dest_stat);
840 new_mode = source_stat.st_mode & ~S_ISVTX;
841 if (info->type == DEVFSD_NOTIFY_CREATE)
842 new_mode |= S_ISVTX;
843 else if ((info->type == DEVFSD_NOTIFY_CHANGE) &&(dest_stat.st_mode & S_ISVTX))
844 new_mode |= S_ISVTX;
845 ret = copy_inode(destination, &dest_stat, new_mode, source, &source_stat);
846 if (ENABLE_DEBUG && ret && (errno != EEXIST))
847 error_logger(LOG_ERR, "copy_inode: %s to %s", source, destination);
848} /* End Function action_copy */
849
850static void action_compat(const struct devfsd_notify_struct *info, unsigned int action)
851/* [SUMMARY] Process a compatibility request.
852 <info> The devfs change.
853 <action> The action to take.
854 [RETURNS] Nothing.
855*/
856{
857 int ret;
858 const char *compat_name = NULL;
859 const char *dest_name = info->devname;
860 const char *ptr;
861 char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
862 int mode, host, bus, target, lun;
863 unsigned int i;
864 char rewind_;
865 /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
866 static const char *const fmt[] = {
867 NULL ,
868 "sg/c%db%dt%du%d", /* scsi/generic */
869 "sd/c%db%dt%du%d", /* scsi/disc */
870 "sr/c%db%dt%du%d", /* scsi/cd */
871 "sd/c%db%dt%du%dp%d", /* scsi/part */
872 "st/c%db%dt%du%dm%d%c", /* scsi/mt */
873 "ide/hd/c%db%dt%du%d", /* ide/host/disc */
874 "ide/cd/c%db%dt%du%d", /* ide/host/cd */
875 "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
876 "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
877 NULL
878 };
879
880 /* First construct compatibility name */
881 switch (action) {
882 case AC_MKOLDCOMPAT:
883 case AC_RMOLDCOMPAT:
884 compat_name = get_old_name(info->devname, info->namelen, compat_buf, info->major, info->minor);
885 break;
886 case AC_MKNEWCOMPAT:
887 case AC_RMNEWCOMPAT:
888 ptr = bb_basename(info->devname);
889 i = scan_dev_name(info->devname, info->namelen, ptr);
890
891 /* nothing found */
892 if (i == 0 || i > 9)
893 return;
894
895 sscanf(info->devname + ((i < 6) ? 5 : 4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
896 snprintf(dest_buf, sizeof(dest_buf), "../%s", info->devname + (( i > 5) ? 4 : 0));
897 dest_name = dest_buf;
898 compat_name = compat_buf;
899
900
901 /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
902 if (i == 1 || i == 2 || i == 3 || i == 6 || i ==7)
903 sprintf(compat_buf, fmt[i], host, bus, target, lun);
904
905 /* 4 == scsi/part 8 == ide/host/part */
906 if (i == 4 || i == 8)
907 sprintf(compat_buf, fmt[i], host, bus, target, lun, atoi(ptr + 4));
908
909 /* 5 == scsi/mt */
910 if (i == 5) {
911 rewind_ = info->devname[info->namelen - 1];
912 if (rewind_ != 'n')
913 rewind_ = '\0';
914 mode=0;
915 if (ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
916 mode = ptr[2] - 107; /* 1 or 2 */
917 if (ptr[2] == 'a')
918 mode = 3;
919 sprintf(compat_buf, fmt[i], host, bus, target, lun, mode, rewind_);
920 }
921
922 /* 9 == ide/host/mt */
923 if (i == 9)
924 snprintf(compat_buf, sizeof(compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
925 /* esac */
926 } /* switch (action) */
927
928 if (compat_name == NULL)
929 return;
930
931 /* Now decide what to do with it */
932 switch (action) {
933 case AC_MKOLDCOMPAT:
934 case AC_MKNEWCOMPAT:
935 mksymlink(dest_name, compat_name);
936 break;
937 case AC_RMOLDCOMPAT:
938 case AC_RMNEWCOMPAT:
939 ret = unlink(compat_name);
940 if (ENABLE_DEBUG && ret)
941 error_logger(LOG_ERR, "unlink: %s", compat_name);
942 break;
943 /*esac*/
944 } /* switch (action) */
945} /* End Function action_compat */
946
947static void restore(char *spath, struct stat source_stat, int rootlen)
948{
949 char *dpath;
950 struct stat dest_stat;
951
952 dest_stat.st_mode = 0;
953 dpath = concat_path_file(mount_point, spath + rootlen);
954 lstat(dpath, &dest_stat);
955 free(dpath);
956 if (S_ISLNK(source_stat.st_mode) || (source_stat.st_mode & S_ISVTX))
957 copy_inode(dpath, &dest_stat,(source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
958
959 if (S_ISDIR(source_stat.st_mode))
960 dir_operation(RESTORE, spath, rootlen,NULL);
961}
962
963
964static int copy_inode(const char *destpath, const struct stat *dest_stat,
965 mode_t new_mode,
966 const char *sourcepath, const struct stat *source_stat)
967/* [SUMMARY] Copy an inode.
968 <destpath> The destination path. An existing inode may be deleted.
969 <dest_stat> The destination stat(2) information.
970 <new_mode> The desired new mode for the destination.
971 <sourcepath> The source path.
972 <source_stat> The source stat(2) information.
973 [RETURNS] TRUE on success, else FALSE.
974*/
975{
976 int source_len, dest_len;
977 char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
978 int fd, val;
979 struct sockaddr_un un_addr;
980 char symlink_val[STRING_LENGTH];
981
982 if ((source_stat->st_mode & S_IFMT) ==(dest_stat->st_mode & S_IFMT)) {
983 /* Same type */
984 if (S_ISLNK(source_stat->st_mode)) {
985 if ((source_len = readlink(sourcepath, source_link, STRING_LENGTH - 1)) < 0
986 || (dest_len = readlink(destpath , dest_link , STRING_LENGTH - 1)) < 0
987 )
988 return FALSE;
989 source_link[source_len] = '\0';
990 dest_link[dest_len] = '\0';
991 if ((source_len != dest_len) || (strcmp(source_link, dest_link) != 0)) {
992 unlink(destpath);
993 symlink(source_link, destpath);
994 }
995 return TRUE;
996 } /* Else not a symlink */
997 chmod(destpath, new_mode & ~S_IFMT);
998 chown(destpath, source_stat->st_uid, source_stat->st_gid);
999 return TRUE;
1000 }
1001 /* Different types: unlink and create */
1002 unlink(destpath);
1003 switch (source_stat->st_mode & S_IFMT) {
1004 case S_IFSOCK:
1005 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
1006 break;
1007 un_addr.sun_family = AF_UNIX;
1008 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s", destpath);
1009 val = bind(fd,(struct sockaddr *) &un_addr,(int) sizeof un_addr);
1010 close(fd);
1011 if (val != 0 || chmod(destpath, new_mode & ~S_IFMT) != 0)
1012 break;
1013 goto do_chown;
1014 case S_IFLNK:
1015 if ((val = readlink(sourcepath, symlink_val, STRING_LENGTH - 1)) < 0)
1016 break;
1017 symlink_val[val] = '\0';
1018 if (symlink(symlink_val, destpath) == 0)
1019 return TRUE;
1020 break;
1021 case S_IFREG:
1022 if ((fd = open(destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT)) < 0)
1023 break;
1024 close(fd);
1025 if (chmod(destpath, new_mode & ~S_IFMT) != 0)
1026 break;
1027 goto do_chown;
1028 case S_IFBLK:
1029 case S_IFCHR:
1030 case S_IFIFO:
1031 if (mknod(destpath, new_mode, source_stat->st_rdev) != 0)
1032 break;
1033 goto do_chown;
1034 case S_IFDIR:
1035 if (mkdir(destpath, new_mode & ~S_IFMT) != 0)
1036 break;
1037do_chown:
1038 if (chown(destpath, source_stat->st_uid, source_stat->st_gid) == 0)
1039 return TRUE;
1040 /*break;*/
1041 }
1042 return FALSE;
1043} /* End Function copy_inode */
1044
1045static void free_config(void)
1046/* [SUMMARY] Free the configuration information.
1047 [RETURNS] Nothing.
1048*/
1049{
1050 struct config_entry_struct *c_entry;
1051 void *next;
1052
1053 for (c_entry = first_config; c_entry != NULL; c_entry = next) {
1054 unsigned int count;
1055
1056 next = c_entry->next;
1057 regfree(&c_entry->preg);
1058 if (c_entry->action.what == AC_EXECUTE) {
1059 for (count = 0; count < MAX_ARGS; ++count) {
1060 if (c_entry->u.execute.argv[count] == NULL)
1061 break;
1062 free(c_entry->u.execute.argv[count]);
1063 }
1064 }
1065 free(c_entry);
1066 }
1067 first_config = NULL;
1068 last_config = NULL;
1069} /* End Function free_config */
1070
1071static int get_uid_gid(int flag, const char *string)
1072/* [SUMMARY] Convert a string to a UID or GID value.
1073 <flag> "UID" or "GID".
1074 <string> The string.
1075 [RETURNS] The UID or GID value.
1076*/
1077{
1078 struct passwd *pw_ent;
1079 struct group *grp_ent;
1080 static const char *msg;
1081
1082 if (ENABLE_DEVFSD_VERBOSE)
1083 msg = "user";
1084
1085 if (isdigit(string[0]) ||((string[0] == '-') && isdigit(string[1])))
1086 return atoi(string);
1087
1088 if (flag == UID && (pw_ent = getpwnam(string)) != NULL)
1089 return pw_ent->pw_uid;
1090
1091 if (flag == GID && (grp_ent = getgrnam(string)) != NULL)
1092 return grp_ent->gr_gid;
1093 else if (ENABLE_DEVFSD_VERBOSE)
1094 msg = "group";
1095
1096 if (ENABLE_DEVFSD_VERBOSE)
1097 msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]);
1098 return 0;
1099}/* End Function get_uid_gid */
1100
1101static mode_t get_mode(const char *string)
1102/* [SUMMARY] Convert a string to a mode value.
1103 <string> The string.
1104 [RETURNS] The mode value.
1105*/
1106{
1107 mode_t mode;
1108 int i;
1109
1110 if (isdigit(string[0]))
1111 return strtoul(string, NULL, 8);
1112 if (strlen(string) != 9)
1113 msg_logger_and_die(LOG_ERR, "bad mode: %s", string);
1114
1115 mode = 0;
1116 i = S_IRUSR;
1117 while (i > 0) {
1118 if (string[0] == 'r' || string[0] == 'w' || string[0] == 'x')
1119 mode += i;
1120 i = i / 2;
1121 string++;
1122 }
1123 return mode;
1124} /* End Function get_mode */
1125
1126static void signal_handler(int sig)
1127{
1128 caught_signal = TRUE;
1129 if (sig == SIGHUP)
1130 caught_sighup = TRUE;
1131
1132 info_logger(LOG_INFO, "Caught signal %d", sig);
1133} /* End Function signal_handler */
1134
1135static const char *get_variable(const char *variable, void *info)
1136{
1137 static char sbuf[sizeof(int)*3 + 2]; /* sign and NUL */
1138
1139 char hostname[STRING_LENGTH];
1140 struct get_variable_info *gv_info = info;
1141 const char *field_names[] = {
1142 "hostname", "mntpt", "devpath", "devname",
1143 "uid", "gid", "mode", hostname, mount_point,
1144 gv_info->devpath, gv_info->devname, NULL
1145 };
1146 int i;
1147
1148 if (gethostname(hostname, STRING_LENGTH - 1) != 0)
1149 /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
1150 error_logger_and_die(LOG_ERR, "gethostname");
1151
1152 hostname[STRING_LENGTH - 1] = '\0';
1153
1154 /* index_in_str_array returns i>=0 */
1155 i = index_in_str_array(field_names, variable);
1156
1157 if (i > 6 || i < 0 || (i > 1 && gv_info == NULL))
1158 return NULL;
1159 if (i >= 0 && i <= 3)
1160 return field_names[i + 7];
1161
1162 if (i == 4)
1163 sprintf(sbuf, "%u", gv_info->info->uid);
1164 else if (i == 5)
1165 sprintf(sbuf, "%u", gv_info->info->gid);
1166 else if (i == 6)
1167 sprintf(sbuf, "%o", gv_info->info->mode);
1168 return sbuf;
1169} /* End Function get_variable */
1170
1171static void service(struct stat statbuf, char *path)
1172{
1173 struct devfsd_notify_struct info;
1174
1175 memset(&info, 0, sizeof info);
1176 info.type = DEVFSD_NOTIFY_REGISTERED;
1177 info.mode = statbuf.st_mode;
1178 info.major = major(statbuf.st_rdev);
1179 info.minor = minor(statbuf.st_rdev);
1180 info.uid = statbuf.st_uid;
1181 info.gid = statbuf.st_gid;
1182 snprintf(info.devname, sizeof(info.devname), "%s", path + strlen(mount_point) + 1);
1183 info.namelen = strlen(info.devname);
1184 service_name(&info);
1185 if (S_ISDIR(statbuf.st_mode))
1186 dir_operation(SERVICE, path, 0, NULL);
1187}
1188
1189static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
1190/* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
1191 <flag> To choose which function to perform
1192 <dp> The directory pointer. This is closed upon completion.
1193 <dir_name> The name of the directory.
1194 <rootlen> string length parameter.
1195 [RETURNS] Nothing.
1196*/
1197{
1198 struct stat statbuf;
1199 DIR *dp;
1200 struct dirent *de;
1201 char *path;
1202
1203 if ((dp = warn_opendir(dir_name)) == NULL)
1204 return;
1205
1206 while ((de = readdir(dp)) != NULL) {
1207
1208 if (de->d_name && DOT_OR_DOTDOT(de->d_name))
1209 continue;
1210 path = concat_path_file(dir_name, de->d_name);
1211 if (lstat(path, &statbuf) == 0) {
1212 switch (type) {
1213 case SERVICE:
1214 service(statbuf, path);
1215 break;
1216 case RESTORE:
1217 restore(path, statbuf, var);
1218 break;
1219 case READ_CONFIG:
1220 read_config_file(path, var, event_mask);
1221 break;
1222 }
1223 }
1224 free(path);
1225 }
1226 closedir(dp);
1227} /* End Function do_scan_and_service */
1228
1229static int mksymlink(const char *oldpath, const char *newpath)
1230/* [SUMMARY] Create a symlink, creating intervening directories as required.
1231 <oldpath> The string contained in the symlink.
1232 <newpath> The name of the new symlink.
1233 [RETURNS] 0 on success, else -1.
1234*/
1235{
1236 if (!make_dir_tree(newpath))
1237 return -1;
1238
1239 if (symlink(oldpath, newpath) != 0) {
1240 if (errno != EEXIST)
1241 return -1;
1242 }
1243 return 0;
1244} /* End Function mksymlink */
1245
1246
1247static int make_dir_tree(const char *path)
1248/* [SUMMARY] Creating intervening directories for a path as required.
1249 <path> The full pathname(including the leaf node).
1250 [RETURNS] TRUE on success, else FALSE.
1251*/
1252{
1253 if (bb_make_directory(dirname((char *)path), -1, FILEUTILS_RECUR) == -1)
1254 return FALSE;
1255 return TRUE;
1256} /* End Function make_dir_tree */
1257
1258static int expand_expression(char *output, unsigned int outsize,
1259 const char *input,
1260 const char *(*get_variable_func)(const char *variable, void *info),
1261 void *info,
1262 const char *devname,
1263 const regmatch_t *ex, unsigned int numexp)
1264/* [SUMMARY] Expand environment variables and regular subexpressions in string.
1265 <output> The output expanded expression is written here.
1266 <length> The size of the output buffer.
1267 <input> The input expression. This may equal <<output>>.
1268 <get_variable> A function which will be used to get variable values. If
1269 this returns NULL, the environment is searched instead. If this is NULL,
1270 only the environment is searched.
1271 <info> An arbitrary pointer passed to <<get_variable>>.
1272 <devname> Device name; specifically, this is the string that contains all
1273 of the regular subexpressions.
1274 <ex> Array of start / end offsets into info->devname for each subexpression
1275 <numexp> Number of regular subexpressions found in <<devname>>.
1276 [RETURNS] TRUE on success, else FALSE.
1277*/
1278{
1279 char temp[STRING_LENGTH];
1280
1281 if (!st_expr_expand(temp, STRING_LENGTH, input, get_variable_func, info))
1282 return FALSE;
1283 expand_regexp(output, outsize, temp, devname, ex, numexp);
1284 return TRUE;
1285} /* End Function expand_expression */
1286
1287static void expand_regexp(char *output, size_t outsize, const char *input,
1288 const char *devname,
1289 const regmatch_t *ex, unsigned int numex)
1290/* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
1291 <output> The output expanded expression is written here.
1292 <outsize> The size of the output buffer.
1293 <input> The input expression. This may NOT equal <<output>>, because
1294 supporting that would require yet another string-copy. However, it's not
1295 hard to write a simple wrapper function to add this functionality for those
1296 few cases that need it.
1297 <devname> Device name; specifically, this is the string that contains all
1298 of the regular subexpressions.
1299 <ex> An array of start and end offsets into <<devname>>, one for each
1300 subexpression
1301 <numex> Number of subexpressions in the offset-array <<ex>>.
1302 [RETURNS] Nothing.
1303*/
1304{
1305 const char last_exp = '0' - 1 + numex;
1306 int c = -1;
1307
1308 /* Guarantee NULL termination by writing an explicit '\0' character into
1309 the very last byte */
1310 if (outsize)
1311 output[--outsize] = '\0';
1312 /* Copy the input string into the output buffer, replacing '\\' with '\'
1313 and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
1314 codes are deleted */
1315 while ((c != '\0') && (outsize != 0)) {
1316 c = *input;
1317 ++input;
1318 if (c == '\\') {
1319 c = *input;
1320 ++input;
1321 if (c != '\\') {
1322 if ((c >= '0') && (c <= last_exp)) {
1323 const regmatch_t *subexp = ex + (c - '0');
1324 unsigned int sublen = subexp->rm_eo - subexp->rm_so;
1325
1326 /* Range checking */
1327 if (sublen > outsize)
1328 sublen = outsize;
1329 strncpy(output, devname + subexp->rm_so, sublen);
1330 output += sublen;
1331 outsize -= sublen;
1332 }
1333 continue;
1334 }
1335 }
1336 *output = c;
1337 ++output;
1338 --outsize;
1339 } /* while */
1340} /* End Function expand_regexp */
1341
1342
1343/* from compat_name.c */
1344
1345struct translate_struct
1346{
1347 const char *match; /* The string to match to(up to length) */
1348 const char *format; /* Format of output, "%s" takes data past match string,
1349 NULL is effectively "%s"(just more efficient) */
1350};
1351
1352static struct translate_struct translate_table[] =
1353{
1354 {"sound/", NULL},
1355 {"printers/", "lp%s"},
1356 {"v4l/", NULL},
1357 {"parports/", "parport%s"},
1358 {"fb/", "fb%s"},
1359 {"netlink/", NULL},
1360 {"loop/", "loop%s"},
1361 {"floppy/", "fd%s"},
1362 {"rd/", "ram%s"},
1363 {"md/", "md%s"}, /* Meta-devices */
1364 {"vc/", "tty%s"},
1365 {"misc/", NULL},
1366 {"isdn/", NULL},
1367 {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
1368 {"i2c/", "i2c-%s"},
1369 {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
1370 {"tts/E", "ttyE%s"}, /* Stallion serial driver */
1371 {"cua/E", "cue%s"}, /* Stallion serial driver callout */
1372 {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
1373 {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
1374 {"ip2/", "ip2%s"}, /* Computone serial driver control */
1375 {"tts/F", "ttyF%s"}, /* Computone serial driver */
1376 {"cua/F", "cuf%s"}, /* Computone serial driver callout */
1377 {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
1378 {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
1379 {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
1380 {"cua/", "cua%s"}, /* Generic serial: must be after others */
1381 {"input/js", "js%s"}, /* Joystick driver */
1382 {NULL, NULL}
1383};
1384
1385const char *get_old_name(const char *devname, unsigned int namelen,
1386 char *buffer, unsigned int major, unsigned int minor)
1387/* [SUMMARY] Translate a kernel-supplied name into an old name.
1388 <devname> The device name provided by the kernel.
1389 <namelen> The length of the name.
1390 <buffer> A buffer that may be used. This should be at least 128 bytes long.
1391 <major> The major number for the device.
1392 <minor> The minor number for the device.
1393 [RETURNS] A pointer to the old name if known, else NULL.
1394*/
1395{
1396 const char *compat_name = NULL;
1397 const char *ptr;
1398 struct translate_struct *trans;
1399 unsigned int i;
1400 char mode;
1401 int indexx;
1402 const char *pty1;
1403 const char *pty2;
1404 size_t len;
1405 /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
1406 static const char *const fmt[] = {
1407 NULL ,
1408 "sg%u", /* scsi/generic */
1409 NULL, /* scsi/disc */
1410 "sr%u", /* scsi/cd */
1411 NULL, /* scsi/part */
1412 "nst%u%c", /* scsi/mt */
1413 "hd%c" , /* ide/host/disc */
1414 "hd%c" , /* ide/host/cd */
1415 "hd%c%s", /* ide/host/part */
1416 "%sht%d", /* ide/host/mt */
1417 "sbpcd%u", /* sbp/ */
1418 "vcs%s", /* vcc/ */
1419 "%cty%c%c", /* pty/ */
1420 NULL
1421 };
1422
1423 for (trans = translate_table; trans->match != NULL; ++trans) {
1424 len = strlen(trans->match);
1425
1426 if (strncmp(devname, trans->match, len) == 0) {
1427 if (trans->format == NULL)
1428 return devname + len;
1429 sprintf(buffer, trans->format, devname + len);
1430 return buffer;
1431 }
1432 }
1433
1434 ptr = bb_basename(devname);
1435 i = scan_dev_name(devname, namelen, ptr);
1436
1437 if (i > 0 && i < 13)
1438 compat_name = buffer;
1439 else
1440 return NULL;
1441
1442 /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
1443 if (i == 1 || i == 3 || i == 10)
1444 sprintf(buffer, fmt[i], minor);
1445
1446 /* 2 ==scsi/disc, 4 == scsi/part */
1447 if (i == 2 || i == 4)
1448 compat_name = write_old_sd_name(buffer, major, minor,((i == 2) ? "" : (ptr + 4)));
1449
1450 /* 5 == scsi/mt */
1451 if (i == 5) {
1452 mode = ptr[2];
1453 if (mode == 'n')
1454 mode = '\0';
1455 sprintf(buffer, fmt[i], minor & 0x1f, mode);
1456 if (devname[namelen - 1] != 'n')
1457 ++compat_name;
1458 }
1459 /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
1460 if (i == 6 || i == 7 || i == 8)
1461 /* last arg should be ignored for i == 6 or i== 7 */
1462 sprintf(buffer, fmt[i] , get_old_ide_name(major, minor), ptr + 4);
1463
1464 /* 9 == ide/host/mt */
1465 if (i == 9)
1466 sprintf(buffer, fmt[i], ptr + 2, minor & 0x7f);
1467
1468 /* 11 == vcc/ */
1469 if (i == 11) {
1470 sprintf(buffer, fmt[i], devname + 4);
1471 if (buffer[3] == '0')
1472 buffer[3] = '\0';
1473 }
1474 /* 12 == pty/ */
1475 if (i == 12) {
1476 pty1 = "pqrstuvwxyzabcde";
1477 pty2 = "0123456789abcdef";
1478 indexx = atoi(devname + 5);
1479 sprintf(buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
1480 }
1481 return compat_name;
1482} /* End Function get_old_name */
1483
1484static char get_old_ide_name(unsigned int major, unsigned int minor)
1485/* [SUMMARY] Get the old IDE name for a device.
1486 <major> The major number for the device.
1487 <minor> The minor number for the device.
1488 [RETURNS] The drive letter.
1489*/
1490{
1491 char letter = 'y'; /* 121 */
1492 char c = 'a'; /* 97 */
1493 int i = IDE0_MAJOR;
1494
1495 /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
1496 do {
1497 if (i == IDE0_MAJOR || i == IDE1_MAJOR || i == IDE2_MAJOR
1498 || i == IDE3_MAJOR || i == IDE4_MAJOR || i == IDE5_MAJOR
1499 || i == IDE6_MAJOR || i == IDE7_MAJOR || i == IDE8_MAJOR
1500 || i == IDE9_MAJOR
1501 ) {
1502 if ((unsigned int)i == major) {
1503 letter = c;
1504 break;
1505 }
1506 c += 2;
1507 }
1508 i++;
1509 } while (i <= IDE9_MAJOR);
1510
1511 if (minor > 63)
1512 ++letter;
1513 return letter;
1514} /* End Function get_old_ide_name */
1515
1516static char *write_old_sd_name(char *buffer,
1517 unsigned int major, unsigned int minor,
1518 const char *part)
1519/* [SUMMARY] Write the old SCSI disc name to a buffer.
1520 <buffer> The buffer to write to.
1521 <major> The major number for the device.
1522 <minor> The minor number for the device.
1523 <part> The partition string. Must be "" for a whole-disc entry.
1524 [RETURNS] A pointer to the buffer on success, else NULL.
1525*/
1526{
1527 unsigned int disc_index;
1528
1529 if (major == 8) {
1530 sprintf(buffer, "sd%c%s", 'a' + (minor >> 4), part);
1531 return buffer;
1532 }
1533 if ((major > 64) && (major < 72)) {
1534 disc_index = ((major - 64) << 4) +(minor >> 4);
1535 if (disc_index < 26)
1536 sprintf(buffer, "sd%c%s", 'a' + disc_index, part);
1537 else
1538 sprintf(buffer, "sd%c%c%s", 'a' +(disc_index / 26) - 1, 'a' + disc_index % 26, part);
1539 return buffer;
1540 }
1541 return NULL;
1542} /* End Function write_old_sd_name */
1543
1544
1545/* expression.c */
1546
1547/*EXPERIMENTAL_FUNCTION*/
1548
1549int st_expr_expand(char *output, unsigned int length, const char *input,
1550 const char *(*get_variable_func)(const char *variable,
1551 void *info),
1552 void *info)
1553/* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
1554 <output> The output expanded expression is written here.
1555 <length> The size of the output buffer.
1556 <input> The input expression. This may equal <<output>>.
1557 <get_variable> A function which will be used to get variable values. If
1558 this returns NULL, the environment is searched instead. If this is NULL,
1559 only the environment is searched.
1560 <info> An arbitrary pointer passed to <<get_variable>>.
1561 [RETURNS] TRUE on success, else FALSE.
1562*/
1563{
1564 char ch;
1565 unsigned int len;
1566 unsigned int out_pos = 0;
1567 const char *env;
1568 const char *ptr;
1569 struct passwd *pwent;
1570 char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
1571
1572 if (length > BUFFER_SIZE)
1573 length = BUFFER_SIZE;
1574 for (; TRUE; ++input) {
1575 switch (ch = *input) {
1576 case '$':
1577 /* Variable expansion */
1578 input = expand_variable(buffer, length, &out_pos, ++input, get_variable_func, info);
1579 if (input == NULL)
1580 return FALSE;
1581 break;
1582 case '~':
1583 /* Home directory expansion */
1584 ch = input[1];
1585 if (isspace(ch) ||(ch == '/') ||(ch == '\0')) {
1586 /* User's own home directory: leave separator for next time */
1587 if ((env = getenv("HOME")) == NULL) {
1588 info_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
1589 return FALSE;
1590 }
1591 len = strlen(env);
1592 if (len + out_pos >= length)
1593 goto st_expr_expand_out;
1594 memcpy(buffer + out_pos, env, len + 1);
1595 out_pos += len;
1596 continue;
1597 }
1598 /* Someone else's home directory */
1599 for (ptr = ++input; !isspace(ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
1600 /* VOID */;
1601 len = ptr - input;
1602 if (len >= sizeof tmp)
1603 goto st_expr_expand_out;
1604 safe_memcpy(tmp, input, len);
1605 input = ptr - 1;
1606 if ((pwent = getpwnam(tmp)) == NULL) {
1607 info_logger(LOG_INFO, "no pwent for: %s", tmp);
1608 return FALSE;
1609 }
1610 len = strlen(pwent->pw_dir);
1611 if (len + out_pos >= length)
1612 goto st_expr_expand_out;
1613 memcpy(buffer + out_pos, pwent->pw_dir, len + 1);
1614 out_pos += len;
1615 break;
1616 case '\0':
1617 /* Falltrough */
1618 default:
1619 if (out_pos >= length)
1620 goto st_expr_expand_out;
1621 buffer[out_pos++] = ch;
1622 if (ch == '\0') {
1623 memcpy(output, buffer, out_pos);
1624 return TRUE;
1625 }
1626 break;
1627 /* esac */
1628 }
1629 }
1630 return FALSE;
1631st_expr_expand_out:
1632 info_logger(LOG_INFO, bb_msg_small_buffer);
1633 return FALSE;
1634} /* End Function st_expr_expand */
1635
1636
1637/* Private functions follow */
1638
1639static const char *expand_variable(char *buffer, unsigned int length,
1640 unsigned int *out_pos, const char *input,
1641 const char *(*func)(const char *variable,
1642 void *info),
1643 void *info)
1644/* [SUMMARY] Expand a variable.
1645 <buffer> The buffer to write to.
1646 <length> The length of the output buffer.
1647 <out_pos> The current output position. This is updated.
1648 <input> A pointer to the input character pointer.
1649 <func> A function which will be used to get variable values. If this
1650 returns NULL, the environment is searched instead. If this is NULL, only
1651 the environment is searched.
1652 <info> An arbitrary pointer passed to <<func>>.
1653 <errfp> Diagnostic messages are written here.
1654 [RETURNS] A pointer to the end of this subexpression on success, else NULL.
1655*/
1656{
1657 char ch;
1658 int len;
1659 unsigned int open_braces;
1660 const char *env, *ptr;
1661 char tmp[STRING_LENGTH];
1662
1663 ch = input[0];
1664 if (ch == '$') {
1665 /* Special case for "$$": PID */
1666 sprintf(tmp, "%d",(int) getpid());
1667 len = strlen(tmp);
1668 if (len + *out_pos >= length)
1669 goto expand_variable_out;
1670
1671 memcpy(buffer + *out_pos, tmp, len + 1);
1672 out_pos += len;
1673 return input;
1674 }
1675 /* Ordinary variable expansion, possibly in braces */
1676 if (ch != '{') {
1677 /* Simple variable expansion */
1678 for (ptr = input; isalnum(ch) || (ch == '_') || (ch == ':'); ch = *++ptr)
1679 /* VOID */;
1680 len = ptr - input;
1681 if ((size_t)len >= sizeof tmp)
1682 goto expand_variable_out;
1683
1684 safe_memcpy(tmp, input, len);
1685 input = ptr - 1;
1686 if ((env = get_variable_v2(tmp, func, info)) == NULL) {
1687 info_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
1688 return NULL;
1689 }
1690 len = strlen(env);
1691 if (len + *out_pos >= length)
1692 goto expand_variable_out;
1693
1694 memcpy(buffer + *out_pos, env, len + 1);
1695 *out_pos += len;
1696 return input;
1697 }
1698 /* Variable in braces: check for ':' tricks */
1699 ch = *++input;
1700 for (ptr = input; isalnum(ch) || (ch == '_'); ch = *++ptr)
1701 /* VOID */;
1702 if (ch == '}') {
1703 /* Must be simple variable expansion with "${var}" */
1704 len = ptr - input;
1705 if ((size_t)len >= sizeof tmp)
1706 goto expand_variable_out;
1707
1708 safe_memcpy(tmp, input, len);
1709 ptr = expand_variable(buffer, length, out_pos, tmp, func, info);
1710 if (ptr == NULL)
1711 return NULL;
1712 return input + len;
1713 }
1714 if (ch != ':' || ptr[1] != '-') {
1715 info_logger(LOG_INFO, "illegal char in var name");
1716 return NULL;
1717 }
1718 /* It's that handy "${var:-word}" expression. Check if var is defined */
1719 len = ptr - input;
1720 if ((size_t)len >= sizeof tmp)
1721 goto expand_variable_out;
1722
1723 safe_memcpy(tmp, input, len);
1724 /* Move input pointer to ':' */
1725 input = ptr;
1726 /* First skip to closing brace, taking note of nested expressions */
1727 ptr += 2;
1728 ch = ptr[0];
1729 for (open_braces = 1; open_braces > 0; ch = *++ptr) {
1730 switch (ch) {
1731 case '{':
1732 ++open_braces;
1733 break;
1734 case '}':
1735 --open_braces;
1736 break;
1737 case '\0':
1738 info_logger(LOG_INFO,"\"}\" not found in: %s", input);
1739 return NULL;
1740 default:
1741 break;
1742 }
1743 }
1744 --ptr;
1745 /* At this point ptr should point to closing brace of "${var:-word}" */
1746 if ((env = get_variable_v2(tmp, func, info)) != NULL) {
1747 /* Found environment variable, so skip the input to the closing brace
1748 and return the variable */
1749 input = ptr;
1750 len = strlen(env);
1751 if (len + *out_pos >= length)
1752 goto expand_variable_out;
1753
1754 memcpy(buffer + *out_pos, env, len + 1);
1755 *out_pos += len;
1756 return input;
1757 }
1758 /* Environment variable was not found, so process word. Advance input
1759 pointer to start of word in "${var:-word}" */
1760 input += 2;
1761 len = ptr - input;
1762 if ((size_t)len >= sizeof tmp)
1763 goto expand_variable_out;
1764
1765 safe_memcpy(tmp, input, len);
1766 input = ptr;
1767 if (!st_expr_expand(tmp, STRING_LENGTH, tmp, func, info))
1768 return NULL;
1769 len = strlen(tmp);
1770 if (len + *out_pos >= length)
1771 goto expand_variable_out;
1772
1773 memcpy(buffer + *out_pos, tmp, len + 1);
1774 *out_pos += len;
1775 return input;
1776expand_variable_out:
1777 info_logger(LOG_INFO, bb_msg_small_buffer);
1778 return NULL;
1779} /* End Function expand_variable */
1780
1781
1782static const char *get_variable_v2(const char *variable,
1783 const char *(*func)(const char *variable, void *info),
1784 void *info)
1785/* [SUMMARY] Get a variable from the environment or .
1786 <variable> The variable name.
1787 <func> A function which will be used to get the variable. If this returns
1788 NULL, the environment is searched instead. If this is NULL, only the
1789 environment is searched.
1790 [RETURNS] The value of the variable on success, else NULL.
1791*/
1792{
1793 const char *value;
1794
1795 if (func != NULL) {
1796 value = (*func)(variable, info);
1797 if (value != NULL)
1798 return value;
1799 }
1800 return getenv(variable);
1801} /* End Function get_variable */
1802
1803/* END OF CODE */
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