1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
7 devfsd implementation for busybox
9 Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
11 Busybox version is based on some previous work and ideas
12 Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it>
16 Main file for devfsd (devfs daemon for Linux).
18 Copyright (C) 1998-2002 Richard Gooch
22 Header file for devfsd (devfs daemon for Linux).
24 Copyright (C) 1998-2000 Richard Gooch
28 Compatibility name file for devfsd (build compatibility names).
30 Copyright (C) 1998-2002 Richard Gooch
34 This code provides Borne Shell-like expression expansion.
36 Copyright (C) 1997-1999 Richard Gooch
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.
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.
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.
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.
57 //#include <sys/wait.h>
58 //#include <sys/ioctl.h>
59 //#include <sys/socket.h>
63 #include <sys/sysmacros.h>
68 /* Various defines taken from linux/major.h */
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 */
100 struct 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 */
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
125 /* for get_uid_gid() */
129 /* fork_and_execute() */
133 /* for dir_operation() */
136 #define READ_CONFIG 2
138 /* Update only after changing code to reflect new protocol */
139 #define DEVFSD_PROTOCOL_REVISION_DAEMON 5
141 /* Compile-time check */
142 #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
143 #error protocol version mismatch. Update your kernel headers
146 #define AC_PERMISSIONS 0
149 #define AC_MFUNCTION 3 /* not supported by busybox */
150 #define AC_CFUNCTION 4 /* not supported by busybox */
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
159 struct permissions_type
168 char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
174 const char *destination;
183 struct config_entry_struct
185 struct action_type action;
189 struct permissions_type permissions;
190 struct execute_type execute;
191 struct copy_type copy;
194 struct config_entry_struct *next;
197 struct get_variable_info
199 const struct devfsd_notify_struct *info;
201 char devpath[STRING_LENGTH];
204 static void dir_operation(int , const char * , int, unsigned long*);
205 static void service(struct stat statbuf, char *path);
206 static int st_expr_expand(char *, unsigned, const char *, const char *(*)(const char *, void *), void *);
207 static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
208 static int mksymlink(const char *oldpath, const char *newpath);
209 static void read_config_file(char *path, int optional, unsigned long *event_mask);
210 static void process_config_line(const char *, unsigned long *);
211 static int do_servicing(int, unsigned long);
212 static void service_name(const struct devfsd_notify_struct *);
213 static void action_permissions(const struct devfsd_notify_struct *, const struct config_entry_struct *);
214 static void action_execute(const struct devfsd_notify_struct *, const struct config_entry_struct *,
215 const regmatch_t *, unsigned);
216 static void action_modload(const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
217 static void action_copy(const struct devfsd_notify_struct *, const struct config_entry_struct *,
218 const regmatch_t *, unsigned);
219 static void action_compat(const struct devfsd_notify_struct *, unsigned);
220 static void free_config(void);
221 static void restore(char *spath, struct stat source_stat, int rootlen);
222 static int copy_inode(const char *, const struct stat *, mode_t, const char *, const struct stat *);
223 static mode_t get_mode(const char *);
224 static void signal_handler(int);
225 static const char *get_variable(const char *, void *);
226 static int make_dir_tree(const char *);
227 static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
228 const char *, const regmatch_t *, unsigned);
229 static void expand_regexp(char *, size_t, const char *, const char *, const regmatch_t *, unsigned);
230 static const char *expand_variable( char *, unsigned, unsigned *, const char *,
231 const char *(*)(const char *, void *), void *);
232 static const char *get_variable_v2(const char *, const char *(*)(const char *, void *), void *);
233 static char get_old_ide_name(unsigned , unsigned);
234 static char *write_old_sd_name(char *, unsigned, unsigned, const char *);
236 /* busybox functions */
237 static int get_uid_gid(int flag, const char *string);
238 static void safe_memcpy(char * dest, const char * src, int len);
239 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr);
240 static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr);
242 /* Structs and vars */
243 static struct config_entry_struct *first_config = NULL;
244 static struct config_entry_struct *last_config = NULL;
245 static char *mount_point = NULL;
246 static volatile int caught_signal = FALSE;
247 static volatile int caught_sighup = FALSE;
248 static struct initial_symlink_struct
252 } initial_symlinks[] =
254 {"/proc/self/fd", "fd"},
261 static struct event_type
263 unsigned int type; /* The DEVFSD_NOTIFY_* value */
264 const char *config_name; /* The name used in the config file */
267 {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
268 {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
269 {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
270 {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
271 {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
272 {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
273 {DEVFSD_NOTIFY_CREATE, "CREATE"},
274 {DEVFSD_NOTIFY_DELETE, "DELETE"},
278 /* Busybox messages */
280 static const char * const bb_msg_proto_rev = "protocol revision";
281 static const char * const bb_msg_bad_config = "bad %s config file: %s";
282 static const char * const bb_msg_small_buffer = "buffer too small";
283 static const char * const bb_msg_variable_not_found = "variable: %s not found";
286 #if ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG
287 #define info_logger(p, fmt, args...) bb_info_msg(fmt, ## args)
288 #define msg_logger(p, fmt, args...) bb_error_msg(fmt, ## args)
289 #define msg_logger_and_die(p, fmt, args...) bb_error_msg_and_die(fmt, ## args)
290 #define error_logger(p, fmt, args...) bb_perror_msg(fmt, ## args)
291 #define error_logger_and_die(p, fmt, args...) bb_perror_msg_and_die(fmt, ## args)
293 #define info_logger(p, fmt, args...)
294 #define msg_logger(p, fmt, args...)
295 #define msg_logger_and_die(p, fmt, args...) exit(1)
296 #define error_logger(p, fmt, args...)
297 #define error_logger_and_die(p, fmt, args...) exit(1)
300 static void safe_memcpy(char *dest, const char *src, int len)
302 memcpy(dest , src, len);
306 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr)
308 if (d[n - 4] == 'd' && d[n - 3] == 'i' && d[n - 2] == 's' && d[n - 1] == 'c')
310 if (d[n - 2] == 'c' && d[n - 1] == 'd')
312 if (ptr[0] == 'p' && ptr[1] == 'a' && ptr[2] == 'r' && ptr[3] == 't')
314 if (ptr[n - 2] == 'm' && ptr[n - 1] == 't')
319 static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr)
321 if (d[0] == 's' && d[1] == 'c' && d[2] == 's' && d[3] == 'i' && d[4] == '/') {
322 if (d[n - 7] == 'g' && d[n - 6] == 'e' && d[n - 5] == 'n'
323 && d[n - 4] == 'e' && d[n - 3] == 'r' && d[n - 2] == 'i' && d[n - 1] == 'c'
326 return scan_dev_name_common(d, n, 0, ptr);
328 if (d[0] == 'i' && d[1] == 'd' && d[2] == 'e' && d[3] == '/'
329 && d[4] == 'h' && d[5] == 'o' && d[6] == 's' && d[7] == 't'
331 return scan_dev_name_common(d, n, 4, ptr);
332 if (d[0] == 's' && d[1] == 'b' && d[2] == 'p' && d[3] == '/')
334 if (d[0] == 'v' && d[1] == 'c' && d[2] == 'c' && d[3] == '/')
336 if (d[0] == 'p' && d[1] == 't' && d[2] == 'y' && d[3] == '/')
341 /* Public functions follow */
343 int devfsd_main(int argc, char **argv);
344 int devfsd_main(int argc, char **argv)
346 int print_version = FALSE;
347 int do_daemon = TRUE;
348 int no_polling = FALSE;
350 int fd, proto_rev, count;
351 unsigned long event_mask = 0;
352 struct sigaction new_action;
353 struct initial_symlink_struct *curr;
358 for (count = 2; count < argc; ++count) {
359 if (argv[count][0] == '-') {
360 if (argv[count][1] == 'v' && !argv[count][2]) /* -v */
361 print_version = TRUE;
362 else if (ENABLE_DEVFSD_FG_NP && argv[count][1] == 'f'
363 && argv[count][2] == 'g' && !argv[count][3]) /* -fg */
365 else if (ENABLE_DEVFSD_FG_NP && argv[count][1] == 'n'
366 && argv[count][2] == 'p' && !argv[count][3]) /* -np */
373 mount_point = bb_simplify_path(argv[1]);
377 fd = xopen(".devfsd", O_RDONLY);
379 if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
380 bb_perror_msg_and_die("FD_CLOEXEC");
382 xioctl(fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev);
384 /*setup initial entries */
385 for (curr = initial_symlinks; curr->dest != NULL; ++curr)
386 symlink(curr->dest, curr->name);
388 /* NB: The check for CONFIG_FILE is done in read_config_file() */
390 if (print_version ||(DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)) {
391 printf("%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
392 applet_name, DEVFSD_VERSION, bb_msg_proto_rev,
393 DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev);
394 if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
395 bb_error_msg_and_die("%s mismatch!", bb_msg_proto_rev);
396 exit(EXIT_SUCCESS); /* -v */
398 /* Tell kernel we are special(i.e. we get to see hidden entries) */
399 xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
401 sigemptyset(&new_action.sa_mask);
402 new_action.sa_flags = 0;
404 /* Set up SIGHUP and SIGUSR1 handlers */
405 new_action.sa_handler = signal_handler;
406 if (sigaction(SIGHUP, &new_action, NULL) != 0 || sigaction(SIGUSR1, &new_action, NULL) != 0)
407 bb_error_msg_and_die("sigaction");
409 printf("%s v%s started for %s\n",applet_name, DEVFSD_VERSION, mount_point);
411 /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
413 read_config_file((char*)CONFIG_FILE, FALSE, &event_mask);
414 /* Do the scan before forking, so that boot scripts see the finished product */
415 dir_operation(SERVICE, mount_point, 0, NULL);
417 if (ENABLE_DEVFSD_FG_NP && no_polling)
420 if (ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG)
421 logmode = LOGMODE_BOTH;
422 else if (do_daemon == TRUE)
423 logmode = LOGMODE_SYSLOG;
424 /* This is the default */
426 logmode = LOGMODE_STDIO; */
429 /* Release so that the child can grab it */
430 xioctl(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
431 bb_daemonize_or_rexec(0, argv);
432 } else if (ENABLE_DEVFSD_FG_NP) {
433 setpgid(0, 0); /* Become process group leader */
437 do_scan = do_servicing(fd, event_mask);
440 read_config_file((char*)CONFIG_FILE, FALSE, &event_mask);
442 dir_operation(SERVICE, mount_point, 0, NULL);
444 if (ENABLE_FEATURE_CLEAN_UP) free(mount_point);
445 } /* End Function main */
448 /* Private functions follow */
450 static void read_config_file(char *path, int optional, unsigned long *event_mask)
451 /* [SUMMARY] Read a configuration database.
452 <path> The path to read the database from. If this is a directory, all
453 entries in that directory will be read(except hidden entries).
454 <optional> If TRUE, the routine will silently ignore a missing config file.
455 <event_mask> The event mask is written here. This is not initialised.
461 char buf[STRING_LENGTH];
465 if (stat(path, &statbuf) == 0) {
466 /* Don't read 0 length files: ignored */
467 /*if (statbuf.st_size == 0)
469 if (S_ISDIR(statbuf.st_mode)) {
470 p = bb_simplify_path(path);
471 dir_operation(READ_CONFIG, p, 0, event_mask);
475 if ((fp = fopen(path, "r")) != NULL) {
476 while (fgets(buf, STRING_LENGTH, fp) != NULL) {
477 /* Skip whitespace */
479 line = skip_whitespace(line);
480 if (line[0] == '\0' || line[0] == '#')
482 process_config_line(line, event_mask);
486 goto read_config_file_err;
489 read_config_file_err:
490 if (optional == 0 && errno == ENOENT)
491 error_logger_and_die(LOG_ERR, "read config file: %s", path);
493 } /* End Function read_config_file */
495 static void process_config_line(const char *line, unsigned long *event_mask)
496 /* [SUMMARY] Process a line from a configuration file.
497 <line> The configuration line.
498 <event_mask> The event mask is written here. This is not initialised.
503 struct config_entry_struct *new;
504 char p[MAX_ARGS][STRING_LENGTH];
505 char when[STRING_LENGTH], what[STRING_LENGTH];
506 char name[STRING_LENGTH];
507 const char *msg = "";
511 /* !!!! Only Uppercase Keywords in devsfd.conf */
512 static const char options[] =
513 "CLEAR_CONFIG\0""INCLUDE\0""OPTIONAL_INCLUDE\0"
514 "RESTORE\0""PERMISSIONS\0""MODLOAD\0""EXECUTE\0"
515 "COPY\0""IGNORE\0""MKOLDCOMPAT\0""MKNEWCOMPAT\0"
516 "RMOLDCOMPAT\0""RMNEWCOMPAT\0";
518 for (count = 0; count < MAX_ARGS; ++count)
520 num_args = sscanf(line, "%s %s %s %s %s %s %s %s %s %s",
522 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
524 i = index_in_strings(options, when);
534 goto process_config_line_err;
536 /* "INCLUDE" & "OPTIONAL_INCLUDE" */
537 if (i == 1 || i == 2) {
538 st_expr_expand(name, STRING_LENGTH, name, get_variable, NULL);
539 info_logger(LOG_INFO, "%sinclude: %s", (toupper(when[0]) == 'I') ? "": "optional_", name);
540 read_config_file(name, (toupper(when[0]) == 'I') ? FALSE : TRUE, event_mask);
545 dir_operation(RESTORE, name, strlen(name),NULL);
549 goto process_config_line_err;
551 new = xzalloc(sizeof *new);
553 for (count = 0; event_types[count].config_name != NULL; ++count) {
554 if (strcasecmp(when, event_types[count].config_name) != 0)
556 new->action.when = event_types[count].type;
559 if (event_types[count].config_name == NULL) {
561 goto process_config_line_err;
564 i = index_in_strings(options, what);
567 case 4: /* "PERMISSIONS" */
568 new->action.what = AC_PERMISSIONS;
569 /* Get user and group */
570 if ((ptr = strchr(p[0], '.')) == NULL) {
572 goto process_config_line_err; /*"missing '.' in UID.GID"*/
576 new->u.permissions.uid = get_uid_gid(UID, p[0]);
577 new->u.permissions.gid = get_uid_gid(GID, ptr);
579 new->u.permissions.mode = get_mode(p[1]);
581 case 5: /* MODLOAD */
582 /*This action will pass "/dev/$devname"(i.e. "/dev/" prefixed to
583 the device name) to the module loading facility. In addition,
584 the /etc/modules.devfs configuration file is used.*/
585 if (ENABLE_DEVFSD_MODLOAD)
586 new->action.what = AC_MODLOAD;
588 case 6: /* EXECUTE */
589 new->action.what = AC_EXECUTE;
592 for (count = 0; count < num_args; ++count)
593 new->u.execute.argv[count] = xstrdup(p[count]);
595 new->u.execute.argv[num_args] = NULL;
598 new->action.what = AC_COPY;
601 goto process_config_line_err; /* missing path and function in line */
603 new->u.copy.source = xstrdup(p[0]);
604 new->u.copy.destination = xstrdup(p[1]);
608 case 9: /* MKOLDCOMPAT */
610 case 10: /* MKNEWCOMPAT */
612 case 11:/* RMOLDCOMPAT */
614 case 12: /* RMNEWCOMPAT */
620 new->action.what = i - 2;
624 goto process_config_line_err;
628 xregcomp(&new->preg, name, REG_EXTENDED);
630 *event_mask |= 1 << new->action.when;
632 if (first_config == NULL)
635 last_config->next = new;
638 process_config_line_err:
639 msg_logger_and_die(LOG_ERR, bb_msg_bad_config, msg , line);
640 } /* End Function process_config_line */
642 static int do_servicing(int fd, unsigned long event_mask)
643 /* [SUMMARY] Service devfs changes until a signal is received.
644 <fd> The open control file.
645 <event_mask> The event mask.
646 [RETURNS] TRUE if SIGHUP was caught, else FALSE.
650 struct devfsd_notify_struct info;
651 unsigned long tmp_event_mask;
653 /* Tell devfs what events we care about */
654 tmp_event_mask = event_mask;
655 xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
656 while (!caught_signal) {
658 bytes = read(fd,(char *) &info, sizeof info);
660 break; /* Must test for this first */
662 continue; /* Yes, the order is important */
668 int c_sighup = caught_sighup;
670 caught_signal = FALSE;
671 caught_sighup = FALSE;
674 msg_logger_and_die(LOG_ERR, "read error on control file");
675 } /* End Function do_servicing */
677 static void service_name(const struct devfsd_notify_struct *info)
678 /* [SUMMARY] Service a single devfs change.
679 <info> The devfs change.
684 regmatch_t mbuf[MAX_SUBEXPR];
685 struct config_entry_struct *entry;
687 if (ENABLE_DEBUG && info->overrun_count > 0)
688 msg_logger(LOG_ERR, "lost %u events", info->overrun_count);
690 /* Discard lookups on "/dev/log" and "/dev/initctl" */
691 if (info->type == DEVFSD_NOTIFY_LOOKUP
692 && ((info->devname[0] == 'l' && info->devname[1] == 'o'
693 && info->devname[2] == 'g' && !info->devname[3])
694 || (info->devname[0] == 'i' && info->devname[1] == 'n'
695 && info->devname[2] == 'i' && info->devname[3] == 't'
696 && info->devname[4] == 'c' && info->devname[5] == 't'
697 && info->devname[6] == 'l' && !info->devname[7]))
701 for (entry = first_config; entry != NULL; entry = entry->next) {
702 /* First check if action matches the type, then check if name matches */
703 if (info->type != entry->action.when
704 || regexec(&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0)
706 for (n = 0;(n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
709 switch (entry->action.what) {
711 action_permissions(info, entry);
714 if (ENABLE_DEVFSD_MODLOAD)
715 action_modload(info, entry);
718 action_execute(info, entry, mbuf, n);
721 action_copy(info, entry, mbuf, n);
730 action_compat(info, entry->action.what);
733 msg_logger_and_die(LOG_ERR, "Unknown action");
736 } /* End Function service_name */
738 static void action_permissions(const struct devfsd_notify_struct *info,
739 const struct config_entry_struct *entry)
740 /* [SUMMARY] Update permissions for a device entry.
741 <info> The devfs change.
742 <entry> The config file entry.
748 if (stat(info->devname, &statbuf) != 0
749 || chmod(info->devname, (statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0
750 || chown(info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0
752 error_logger(LOG_ERR, "Can't chmod or chown: %s", info->devname);
753 } /* End Function action_permissions */
755 static void action_modload(const struct devfsd_notify_struct *info,
756 const struct config_entry_struct *entry ATTRIBUTE_UNUSED)
757 /* [SUMMARY] Load a module.
758 <info> The devfs change.
759 <entry> The config file entry.
765 argv[0] = (char*)MODPROBE;
766 argv[1] = (char*)MODPROBE_SWITCH_1; /* "-k" */
767 argv[2] = (char*)MODPROBE_SWITCH_2; /* "-C" */
768 argv[3] = (char*)CONFIG_MODULES_DEVFS;
769 argv[4] = concat_path_file("/dev", info->devname); /* device */
772 wait4pid(xspawn(argv));
774 } /* End Function action_modload */
776 static void action_execute(const struct devfsd_notify_struct *info,
777 const struct config_entry_struct *entry,
778 const regmatch_t *regexpr, unsigned int numexpr)
779 /* [SUMMARY] Execute a programme.
780 <info> The devfs change.
781 <entry> The config file entry.
782 <regexpr> The number of subexpression(start, end) offsets within the
784 <numexpr> The number of elements within <<regexpr>>.
789 struct get_variable_info gv_info;
790 char *argv[MAX_ARGS + 1];
791 char largv[MAX_ARGS + 1][STRING_LENGTH];
794 gv_info.devname = info->devname;
795 snprintf(gv_info.devpath, sizeof(gv_info.devpath), "%s/%s", mount_point, info->devname);
796 for (count = 0; entry->u.execute.argv[count] != NULL; ++count) {
797 expand_expression(largv[count], STRING_LENGTH,
798 entry->u.execute.argv[count],
799 get_variable, &gv_info,
800 gv_info.devname, regexpr, numexpr);
801 argv[count] = largv[count];
804 wait4pid(spawn(argv));
805 } /* End Function action_execute */
808 static void action_copy(const struct devfsd_notify_struct *info,
809 const struct config_entry_struct *entry,
810 const regmatch_t *regexpr, unsigned int numexpr)
811 /* [SUMMARY] Copy permissions.
812 <info> The devfs change.
813 <entry> The config file entry.
814 <regexpr> This list of subexpression(start, end) offsets within the
816 <numexpr> The number of elements in <<regexpr>>.
821 struct get_variable_info gv_info;
822 struct stat source_stat, dest_stat;
823 char source[STRING_LENGTH], destination[STRING_LENGTH];
826 dest_stat.st_mode = 0;
828 if ((info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK(info->mode))
831 gv_info.devname = info->devname;
833 snprintf(gv_info.devpath, sizeof(gv_info.devpath), "%s/%s", mount_point, info->devname);
834 expand_expression(source, STRING_LENGTH, entry->u.copy.source,
835 get_variable, &gv_info, gv_info.devname,
838 expand_expression(destination, STRING_LENGTH, entry->u.copy.destination,
839 get_variable, &gv_info, gv_info.devname,
842 if (!make_dir_tree(destination) || lstat(source, &source_stat) != 0)
844 lstat(destination, &dest_stat);
845 new_mode = source_stat.st_mode & ~S_ISVTX;
846 if (info->type == DEVFSD_NOTIFY_CREATE)
848 else if ((info->type == DEVFSD_NOTIFY_CHANGE) &&(dest_stat.st_mode & S_ISVTX))
850 ret = copy_inode(destination, &dest_stat, new_mode, source, &source_stat);
851 if (ENABLE_DEBUG && ret && (errno != EEXIST))
852 error_logger(LOG_ERR, "copy_inode: %s to %s", source, destination);
853 } /* End Function action_copy */
855 static void action_compat(const struct devfsd_notify_struct *info, unsigned int action)
856 /* [SUMMARY] Process a compatibility request.
857 <info> The devfs change.
858 <action> The action to take.
863 const char *compat_name = NULL;
864 const char *dest_name = info->devname;
866 char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
867 int mode, host, bus, target, lun;
870 /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
871 static const char *const fmt[] = {
873 "sg/c%db%dt%du%d", /* scsi/generic */
874 "sd/c%db%dt%du%d", /* scsi/disc */
875 "sr/c%db%dt%du%d", /* scsi/cd */
876 "sd/c%db%dt%du%dp%d", /* scsi/part */
877 "st/c%db%dt%du%dm%d%c", /* scsi/mt */
878 "ide/hd/c%db%dt%du%d", /* ide/host/disc */
879 "ide/cd/c%db%dt%du%d", /* ide/host/cd */
880 "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
881 "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
885 /* First construct compatibility name */
889 compat_name = get_old_name(info->devname, info->namelen, compat_buf, info->major, info->minor);
893 ptr = bb_basename(info->devname);
894 i = scan_dev_name(info->devname, info->namelen, ptr);
900 sscanf(info->devname + ((i < 6) ? 5 : 4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
901 snprintf(dest_buf, sizeof(dest_buf), "../%s", info->devname + (( i > 5) ? 4 : 0));
902 dest_name = dest_buf;
903 compat_name = compat_buf;
906 /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
907 if (i == 1 || i == 2 || i == 3 || i == 6 || i ==7)
908 sprintf(compat_buf, fmt[i], host, bus, target, lun);
910 /* 4 == scsi/part 8 == ide/host/part */
911 if (i == 4 || i == 8)
912 sprintf(compat_buf, fmt[i], host, bus, target, lun, atoi(ptr + 4));
916 rewind_ = info->devname[info->namelen - 1];
920 if (ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
921 mode = ptr[2] - 107; /* 1 or 2 */
924 sprintf(compat_buf, fmt[i], host, bus, target, lun, mode, rewind_);
927 /* 9 == ide/host/mt */
929 snprintf(compat_buf, sizeof(compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
931 } /* switch (action) */
933 if (compat_name == NULL)
936 /* Now decide what to do with it */
940 mksymlink(dest_name, compat_name);
944 ret = unlink(compat_name);
945 if (ENABLE_DEBUG && ret)
946 error_logger(LOG_ERR, "unlink: %s", compat_name);
949 } /* switch (action) */
950 } /* End Function action_compat */
952 static void restore(char *spath, struct stat source_stat, int rootlen)
955 struct stat dest_stat;
957 dest_stat.st_mode = 0;
958 dpath = concat_path_file(mount_point, spath + rootlen);
959 lstat(dpath, &dest_stat);
961 if (S_ISLNK(source_stat.st_mode) || (source_stat.st_mode & S_ISVTX))
962 copy_inode(dpath, &dest_stat,(source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
964 if (S_ISDIR(source_stat.st_mode))
965 dir_operation(RESTORE, spath, rootlen,NULL);
969 static int copy_inode(const char *destpath, const struct stat *dest_stat,
971 const char *sourcepath, const struct stat *source_stat)
972 /* [SUMMARY] Copy an inode.
973 <destpath> The destination path. An existing inode may be deleted.
974 <dest_stat> The destination stat(2) information.
975 <new_mode> The desired new mode for the destination.
976 <sourcepath> The source path.
977 <source_stat> The source stat(2) information.
978 [RETURNS] TRUE on success, else FALSE.
981 int source_len, dest_len;
982 char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
984 struct sockaddr_un un_addr;
985 char symlink_val[STRING_LENGTH];
987 if ((source_stat->st_mode & S_IFMT) ==(dest_stat->st_mode & S_IFMT)) {
989 if (S_ISLNK(source_stat->st_mode)) {
990 if ((source_len = readlink(sourcepath, source_link, STRING_LENGTH - 1)) < 0
991 || (dest_len = readlink(destpath , dest_link , STRING_LENGTH - 1)) < 0
994 source_link[source_len] = '\0';
995 dest_link[dest_len] = '\0';
996 if ((source_len != dest_len) || (strcmp(source_link, dest_link) != 0)) {
998 symlink(source_link, destpath);
1001 } /* Else not a symlink */
1002 chmod(destpath, new_mode & ~S_IFMT);
1003 chown(destpath, source_stat->st_uid, source_stat->st_gid);
1006 /* Different types: unlink and create */
1008 switch (source_stat->st_mode & S_IFMT) {
1010 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
1012 un_addr.sun_family = AF_UNIX;
1013 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s", destpath);
1014 val = bind(fd,(struct sockaddr *) &un_addr,(int) sizeof un_addr);
1016 if (val != 0 || chmod(destpath, new_mode & ~S_IFMT) != 0)
1020 if ((val = readlink(sourcepath, symlink_val, STRING_LENGTH - 1)) < 0)
1022 symlink_val[val] = '\0';
1023 if (symlink(symlink_val, destpath) == 0)
1027 if ((fd = open(destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT)) < 0)
1030 if (chmod(destpath, new_mode & ~S_IFMT) != 0)
1036 if (mknod(destpath, new_mode, source_stat->st_rdev) != 0)
1040 if (mkdir(destpath, new_mode & ~S_IFMT) != 0)
1043 if (chown(destpath, source_stat->st_uid, source_stat->st_gid) == 0)
1048 } /* End Function copy_inode */
1050 static void free_config(void)
1051 /* [SUMMARY] Free the configuration information.
1055 struct config_entry_struct *c_entry;
1058 for (c_entry = first_config; c_entry != NULL; c_entry = next) {
1061 next = c_entry->next;
1062 regfree(&c_entry->preg);
1063 if (c_entry->action.what == AC_EXECUTE) {
1064 for (count = 0; count < MAX_ARGS; ++count) {
1065 if (c_entry->u.execute.argv[count] == NULL)
1067 free(c_entry->u.execute.argv[count]);
1072 first_config = NULL;
1074 } /* End Function free_config */
1076 static int get_uid_gid(int flag, const char *string)
1077 /* [SUMMARY] Convert a string to a UID or GID value.
1078 <flag> "UID" or "GID".
1079 <string> The string.
1080 [RETURNS] The UID or GID value.
1083 struct passwd *pw_ent;
1084 struct group *grp_ent;
1085 static const char *msg;
1087 if (ENABLE_DEVFSD_VERBOSE)
1090 if (isdigit(string[0]) ||((string[0] == '-') && isdigit(string[1])))
1091 return atoi(string);
1093 if (flag == UID && (pw_ent = getpwnam(string)) != NULL)
1094 return pw_ent->pw_uid;
1096 if (flag == GID && (grp_ent = getgrnam(string)) != NULL)
1097 return grp_ent->gr_gid;
1098 else if (ENABLE_DEVFSD_VERBOSE)
1101 if (ENABLE_DEVFSD_VERBOSE)
1102 msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]);
1104 }/* End Function get_uid_gid */
1106 static mode_t get_mode(const char *string)
1107 /* [SUMMARY] Convert a string to a mode value.
1108 <string> The string.
1109 [RETURNS] The mode value.
1115 if (isdigit(string[0]))
1116 return strtoul(string, NULL, 8);
1117 if (strlen(string) != 9)
1118 msg_logger_and_die(LOG_ERR, "bad mode: %s", string);
1123 if (string[0] == 'r' || string[0] == 'w' || string[0] == 'x')
1129 } /* End Function get_mode */
1131 static void signal_handler(int sig)
1133 caught_signal = TRUE;
1135 caught_sighup = TRUE;
1137 info_logger(LOG_INFO, "Caught signal %d", sig);
1138 } /* End Function signal_handler */
1140 static const char *get_variable(const char *variable, void *info)
1142 static char sbuf[sizeof(int)*3 + 2]; /* sign and NUL */
1144 char hostname[STRING_LENGTH];
1145 struct get_variable_info *gv_info = info;
1146 const char *field_names[] = {
1147 "hostname", "mntpt", "devpath", "devname",
1148 "uid", "gid", "mode", hostname, mount_point,
1149 gv_info->devpath, gv_info->devname, NULL
1153 if (gethostname(hostname, STRING_LENGTH - 1) != 0)
1154 /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
1155 error_logger_and_die(LOG_ERR, "gethostname");
1157 hostname[STRING_LENGTH - 1] = '\0';
1159 /* index_in_str_array returns i>=0 */
1160 i = index_in_str_array(field_names, variable);
1162 if (i > 6 || i < 0 || (i > 1 && gv_info == NULL))
1164 if (i >= 0 && i <= 3)
1165 return field_names[i + 7];
1168 sprintf(sbuf, "%u", gv_info->info->uid);
1170 sprintf(sbuf, "%u", gv_info->info->gid);
1172 sprintf(sbuf, "%o", gv_info->info->mode);
1174 } /* End Function get_variable */
1176 static void service(struct stat statbuf, char *path)
1178 struct devfsd_notify_struct info;
1180 memset(&info, 0, sizeof info);
1181 info.type = DEVFSD_NOTIFY_REGISTERED;
1182 info.mode = statbuf.st_mode;
1183 info.major = major(statbuf.st_rdev);
1184 info.minor = minor(statbuf.st_rdev);
1185 info.uid = statbuf.st_uid;
1186 info.gid = statbuf.st_gid;
1187 snprintf(info.devname, sizeof(info.devname), "%s", path + strlen(mount_point) + 1);
1188 info.namelen = strlen(info.devname);
1189 service_name(&info);
1190 if (S_ISDIR(statbuf.st_mode))
1191 dir_operation(SERVICE, path, 0, NULL);
1194 static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
1195 /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
1196 <flag> To choose which function to perform
1197 <dp> The directory pointer. This is closed upon completion.
1198 <dir_name> The name of the directory.
1199 <rootlen> string length parameter.
1203 struct stat statbuf;
1208 if ((dp = warn_opendir(dir_name)) == NULL)
1211 while ((de = readdir(dp)) != NULL) {
1213 if (de->d_name && DOT_OR_DOTDOT(de->d_name))
1215 path = concat_path_file(dir_name, de->d_name);
1216 if (lstat(path, &statbuf) == 0) {
1219 service(statbuf, path);
1222 restore(path, statbuf, var);
1225 read_config_file(path, var, event_mask);
1232 } /* End Function do_scan_and_service */
1234 static int mksymlink(const char *oldpath, const char *newpath)
1235 /* [SUMMARY] Create a symlink, creating intervening directories as required.
1236 <oldpath> The string contained in the symlink.
1237 <newpath> The name of the new symlink.
1238 [RETURNS] 0 on success, else -1.
1241 if (!make_dir_tree(newpath))
1244 if (symlink(oldpath, newpath) != 0) {
1245 if (errno != EEXIST)
1249 } /* End Function mksymlink */
1252 static int make_dir_tree(const char *path)
1253 /* [SUMMARY] Creating intervening directories for a path as required.
1254 <path> The full pathname(including the leaf node).
1255 [RETURNS] TRUE on success, else FALSE.
1258 if (bb_make_directory(dirname((char *)path), -1, FILEUTILS_RECUR) == -1)
1261 } /* End Function make_dir_tree */
1263 static int expand_expression(char *output, unsigned int outsize,
1265 const char *(*get_variable_func)(const char *variable, void *info),
1267 const char *devname,
1268 const regmatch_t *ex, unsigned int numexp)
1269 /* [SUMMARY] Expand environment variables and regular subexpressions in string.
1270 <output> The output expanded expression is written here.
1271 <length> The size of the output buffer.
1272 <input> The input expression. This may equal <<output>>.
1273 <get_variable> A function which will be used to get variable values. If
1274 this returns NULL, the environment is searched instead. If this is NULL,
1275 only the environment is searched.
1276 <info> An arbitrary pointer passed to <<get_variable>>.
1277 <devname> Device name; specifically, this is the string that contains all
1278 of the regular subexpressions.
1279 <ex> Array of start / end offsets into info->devname for each subexpression
1280 <numexp> Number of regular subexpressions found in <<devname>>.
1281 [RETURNS] TRUE on success, else FALSE.
1284 char temp[STRING_LENGTH];
1286 if (!st_expr_expand(temp, STRING_LENGTH, input, get_variable_func, info))
1288 expand_regexp(output, outsize, temp, devname, ex, numexp);
1290 } /* End Function expand_expression */
1292 static void expand_regexp(char *output, size_t outsize, const char *input,
1293 const char *devname,
1294 const regmatch_t *ex, unsigned int numex)
1295 /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
1296 <output> The output expanded expression is written here.
1297 <outsize> The size of the output buffer.
1298 <input> The input expression. This may NOT equal <<output>>, because
1299 supporting that would require yet another string-copy. However, it's not
1300 hard to write a simple wrapper function to add this functionality for those
1301 few cases that need it.
1302 <devname> Device name; specifically, this is the string that contains all
1303 of the regular subexpressions.
1304 <ex> An array of start and end offsets into <<devname>>, one for each
1306 <numex> Number of subexpressions in the offset-array <<ex>>.
1310 const char last_exp = '0' - 1 + numex;
1313 /* Guarantee NULL termination by writing an explicit '\0' character into
1314 the very last byte */
1316 output[--outsize] = '\0';
1317 /* Copy the input string into the output buffer, replacing '\\' with '\'
1318 and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
1319 codes are deleted */
1320 while ((c != '\0') && (outsize != 0)) {
1327 if ((c >= '0') && (c <= last_exp)) {
1328 const regmatch_t *subexp = ex + (c - '0');
1329 unsigned int sublen = subexp->rm_eo - subexp->rm_so;
1331 /* Range checking */
1332 if (sublen > outsize)
1334 strncpy(output, devname + subexp->rm_so, sublen);
1345 } /* End Function expand_regexp */
1348 /* from compat_name.c */
1350 struct translate_struct
1352 const char *match; /* The string to match to(up to length) */
1353 const char *format; /* Format of output, "%s" takes data past match string,
1354 NULL is effectively "%s"(just more efficient) */
1357 static struct translate_struct translate_table[] =
1360 {"printers/", "lp%s"},
1362 {"parports/", "parport%s"},
1365 {"loop/", "loop%s"},
1366 {"floppy/", "fd%s"},
1368 {"md/", "md%s"}, /* Meta-devices */
1372 {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
1374 {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
1375 {"tts/E", "ttyE%s"}, /* Stallion serial driver */
1376 {"cua/E", "cue%s"}, /* Stallion serial driver callout */
1377 {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
1378 {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
1379 {"ip2/", "ip2%s"}, /* Computone serial driver control */
1380 {"tts/F", "ttyF%s"}, /* Computone serial driver */
1381 {"cua/F", "cuf%s"}, /* Computone serial driver callout */
1382 {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
1383 {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
1384 {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
1385 {"cua/", "cua%s"}, /* Generic serial: must be after others */
1386 {"input/js", "js%s"}, /* Joystick driver */
1390 const char *get_old_name(const char *devname, unsigned int namelen,
1391 char *buffer, unsigned int major, unsigned int minor)
1392 /* [SUMMARY] Translate a kernel-supplied name into an old name.
1393 <devname> The device name provided by the kernel.
1394 <namelen> The length of the name.
1395 <buffer> A buffer that may be used. This should be at least 128 bytes long.
1396 <major> The major number for the device.
1397 <minor> The minor number for the device.
1398 [RETURNS] A pointer to the old name if known, else NULL.
1401 const char *compat_name = NULL;
1403 struct translate_struct *trans;
1410 /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
1411 static const char *const fmt[] = {
1413 "sg%u", /* scsi/generic */
1414 NULL, /* scsi/disc */
1415 "sr%u", /* scsi/cd */
1416 NULL, /* scsi/part */
1417 "nst%u%c", /* scsi/mt */
1418 "hd%c" , /* ide/host/disc */
1419 "hd%c" , /* ide/host/cd */
1420 "hd%c%s", /* ide/host/part */
1421 "%sht%d", /* ide/host/mt */
1422 "sbpcd%u", /* sbp/ */
1424 "%cty%c%c", /* pty/ */
1428 for (trans = translate_table; trans->match != NULL; ++trans) {
1429 len = strlen(trans->match);
1431 if (strncmp(devname, trans->match, len) == 0) {
1432 if (trans->format == NULL)
1433 return devname + len;
1434 sprintf(buffer, trans->format, devname + len);
1439 ptr = bb_basename(devname);
1440 i = scan_dev_name(devname, namelen, ptr);
1442 if (i > 0 && i < 13)
1443 compat_name = buffer;
1447 /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
1448 if (i == 1 || i == 3 || i == 10)
1449 sprintf(buffer, fmt[i], minor);
1451 /* 2 ==scsi/disc, 4 == scsi/part */
1452 if (i == 2 || i == 4)
1453 compat_name = write_old_sd_name(buffer, major, minor,((i == 2) ? "" : (ptr + 4)));
1460 sprintf(buffer, fmt[i], minor & 0x1f, mode);
1461 if (devname[namelen - 1] != 'n')
1464 /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
1465 if (i == 6 || i == 7 || i == 8)
1466 /* last arg should be ignored for i == 6 or i== 7 */
1467 sprintf(buffer, fmt[i] , get_old_ide_name(major, minor), ptr + 4);
1469 /* 9 == ide/host/mt */
1471 sprintf(buffer, fmt[i], ptr + 2, minor & 0x7f);
1475 sprintf(buffer, fmt[i], devname + 4);
1476 if (buffer[3] == '0')
1481 pty1 = "pqrstuvwxyzabcde";
1482 pty2 = "0123456789abcdef";
1483 indexx = atoi(devname + 5);
1484 sprintf(buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
1487 } /* End Function get_old_name */
1489 static char get_old_ide_name(unsigned int major, unsigned int minor)
1490 /* [SUMMARY] Get the old IDE name for a device.
1491 <major> The major number for the device.
1492 <minor> The minor number for the device.
1493 [RETURNS] The drive letter.
1496 char letter = 'y'; /* 121 */
1497 char c = 'a'; /* 97 */
1500 /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
1502 if (i == IDE0_MAJOR || i == IDE1_MAJOR || i == IDE2_MAJOR
1503 || i == IDE3_MAJOR || i == IDE4_MAJOR || i == IDE5_MAJOR
1504 || i == IDE6_MAJOR || i == IDE7_MAJOR || i == IDE8_MAJOR
1507 if ((unsigned int)i == major) {
1514 } while (i <= IDE9_MAJOR);
1519 } /* End Function get_old_ide_name */
1521 static char *write_old_sd_name(char *buffer,
1522 unsigned int major, unsigned int minor,
1524 /* [SUMMARY] Write the old SCSI disc name to a buffer.
1525 <buffer> The buffer to write to.
1526 <major> The major number for the device.
1527 <minor> The minor number for the device.
1528 <part> The partition string. Must be "" for a whole-disc entry.
1529 [RETURNS] A pointer to the buffer on success, else NULL.
1532 unsigned int disc_index;
1535 sprintf(buffer, "sd%c%s", 'a' + (minor >> 4), part);
1538 if ((major > 64) && (major < 72)) {
1539 disc_index = ((major - 64) << 4) +(minor >> 4);
1540 if (disc_index < 26)
1541 sprintf(buffer, "sd%c%s", 'a' + disc_index, part);
1543 sprintf(buffer, "sd%c%c%s", 'a' +(disc_index / 26) - 1, 'a' + disc_index % 26, part);
1547 } /* End Function write_old_sd_name */
1552 /*EXPERIMENTAL_FUNCTION*/
1554 int st_expr_expand(char *output, unsigned int length, const char *input,
1555 const char *(*get_variable_func)(const char *variable,
1558 /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
1559 <output> The output expanded expression is written here.
1560 <length> The size of the output buffer.
1561 <input> The input expression. This may equal <<output>>.
1562 <get_variable> A function which will be used to get variable values. If
1563 this returns NULL, the environment is searched instead. If this is NULL,
1564 only the environment is searched.
1565 <info> An arbitrary pointer passed to <<get_variable>>.
1566 [RETURNS] TRUE on success, else FALSE.
1571 unsigned int out_pos = 0;
1574 struct passwd *pwent;
1575 char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
1577 if (length > BUFFER_SIZE)
1578 length = BUFFER_SIZE;
1579 for (; TRUE; ++input) {
1580 switch (ch = *input) {
1582 /* Variable expansion */
1583 input = expand_variable(buffer, length, &out_pos, ++input, get_variable_func, info);
1588 /* Home directory expansion */
1590 if (isspace(ch) ||(ch == '/') ||(ch == '\0')) {
1591 /* User's own home directory: leave separator for next time */
1592 if ((env = getenv("HOME")) == NULL) {
1593 info_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
1597 if (len + out_pos >= length)
1598 goto st_expr_expand_out;
1599 memcpy(buffer + out_pos, env, len + 1);
1603 /* Someone else's home directory */
1604 for (ptr = ++input; !isspace(ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
1607 if (len >= sizeof tmp)
1608 goto st_expr_expand_out;
1609 safe_memcpy(tmp, input, len);
1611 if ((pwent = getpwnam(tmp)) == NULL) {
1612 info_logger(LOG_INFO, "no pwent for: %s", tmp);
1615 len = strlen(pwent->pw_dir);
1616 if (len + out_pos >= length)
1617 goto st_expr_expand_out;
1618 memcpy(buffer + out_pos, pwent->pw_dir, len + 1);
1624 if (out_pos >= length)
1625 goto st_expr_expand_out;
1626 buffer[out_pos++] = ch;
1628 memcpy(output, buffer, out_pos);
1637 info_logger(LOG_INFO, bb_msg_small_buffer);
1639 } /* End Function st_expr_expand */
1642 /* Private functions follow */
1644 static const char *expand_variable(char *buffer, unsigned int length,
1645 unsigned int *out_pos, const char *input,
1646 const char *(*func)(const char *variable,
1649 /* [SUMMARY] Expand a variable.
1650 <buffer> The buffer to write to.
1651 <length> The length of the output buffer.
1652 <out_pos> The current output position. This is updated.
1653 <input> A pointer to the input character pointer.
1654 <func> A function which will be used to get variable values. If this
1655 returns NULL, the environment is searched instead. If this is NULL, only
1656 the environment is searched.
1657 <info> An arbitrary pointer passed to <<func>>.
1658 <errfp> Diagnostic messages are written here.
1659 [RETURNS] A pointer to the end of this subexpression on success, else NULL.
1664 unsigned int open_braces;
1665 const char *env, *ptr;
1666 char tmp[STRING_LENGTH];
1670 /* Special case for "$$": PID */
1671 sprintf(tmp, "%d",(int) getpid());
1673 if (len + *out_pos >= length)
1674 goto expand_variable_out;
1676 memcpy(buffer + *out_pos, tmp, len + 1);
1680 /* Ordinary variable expansion, possibly in braces */
1682 /* Simple variable expansion */
1683 for (ptr = input; isalnum(ch) || (ch == '_') || (ch == ':'); ch = *++ptr)
1686 if ((size_t)len >= sizeof tmp)
1687 goto expand_variable_out;
1689 safe_memcpy(tmp, input, len);
1691 if ((env = get_variable_v2(tmp, func, info)) == NULL) {
1692 info_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
1696 if (len + *out_pos >= length)
1697 goto expand_variable_out;
1699 memcpy(buffer + *out_pos, env, len + 1);
1703 /* Variable in braces: check for ':' tricks */
1705 for (ptr = input; isalnum(ch) || (ch == '_'); ch = *++ptr)
1708 /* Must be simple variable expansion with "${var}" */
1710 if ((size_t)len >= sizeof tmp)
1711 goto expand_variable_out;
1713 safe_memcpy(tmp, input, len);
1714 ptr = expand_variable(buffer, length, out_pos, tmp, func, info);
1719 if (ch != ':' || ptr[1] != '-') {
1720 info_logger(LOG_INFO, "illegal char in var name");
1723 /* It's that handy "${var:-word}" expression. Check if var is defined */
1725 if ((size_t)len >= sizeof tmp)
1726 goto expand_variable_out;
1728 safe_memcpy(tmp, input, len);
1729 /* Move input pointer to ':' */
1731 /* First skip to closing brace, taking note of nested expressions */
1734 for (open_braces = 1; open_braces > 0; ch = *++ptr) {
1743 info_logger(LOG_INFO,"\"}\" not found in: %s", input);
1750 /* At this point ptr should point to closing brace of "${var:-word}" */
1751 if ((env = get_variable_v2(tmp, func, info)) != NULL) {
1752 /* Found environment variable, so skip the input to the closing brace
1753 and return the variable */
1756 if (len + *out_pos >= length)
1757 goto expand_variable_out;
1759 memcpy(buffer + *out_pos, env, len + 1);
1763 /* Environment variable was not found, so process word. Advance input
1764 pointer to start of word in "${var:-word}" */
1767 if ((size_t)len >= sizeof tmp)
1768 goto expand_variable_out;
1770 safe_memcpy(tmp, input, len);
1772 if (!st_expr_expand(tmp, STRING_LENGTH, tmp, func, info))
1775 if (len + *out_pos >= length)
1776 goto expand_variable_out;
1778 memcpy(buffer + *out_pos, tmp, len + 1);
1781 expand_variable_out:
1782 info_logger(LOG_INFO, bb_msg_small_buffer);
1784 } /* End Function expand_variable */
1787 static const char *get_variable_v2(const char *variable,
1788 const char *(*func)(const char *variable, void *info),
1790 /* [SUMMARY] Get a variable from the environment or .
1791 <variable> The variable name.
1792 <func> A function which will be used to get the variable. If this returns
1793 NULL, the environment is searched instead. If this is NULL, only the
1794 environment is searched.
1795 [RETURNS] The value of the variable on success, else NULL.
1801 value = (*func)(variable, info);
1805 return getenv(variable);
1806 } /* End Function get_variable */