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.
66 #include <sys/types.h>
68 #include <sys/ioctl.h>
69 #include <sys/socket.h>
76 #include <sys/sysmacros.h>
79 /* Various defines taken from linux/major.h */
92 /* Various defines taken from linux/devfs_fs.h */
93 #define DEVFSD_PROTOCOL_REVISION_KERNEL 5
94 #define DEVFSD_IOCTL_BASE 'd'
95 /* These are the various ioctls */
96 #define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int)
97 #define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int)
98 #define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int)
99 #define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int)
100 #define DEVFSD_NOTIFY_REGISTERED 0
101 #define DEVFSD_NOTIFY_UNREGISTERED 1
102 #define DEVFSD_NOTIFY_ASYNC_OPEN 2
103 #define DEVFSD_NOTIFY_CLOSE 3
104 #define DEVFSD_NOTIFY_LOOKUP 4
105 #define DEVFSD_NOTIFY_CHANGE 5
106 #define DEVFSD_NOTIFY_CREATE 6
107 #define DEVFSD_NOTIFY_DELETE 7
108 #define DEVFS_PATHLEN 1024
109 /* Never change this otherwise the binary interface will change */
111 struct devfsd_notify_struct
112 { /* Use native C types to ensure same types in kernel and user space */
113 unsigned int type; /* DEVFSD_NOTIFY_* value */
114 unsigned int mode; /* Mode of the inode or device entry */
115 unsigned int major; /* Major number of device entry */
116 unsigned int minor; /* Minor number of device entry */
117 unsigned int uid; /* Uid of process, inode or device entry */
118 unsigned int gid; /* Gid of process, inode or device entry */
119 unsigned int overrun_count; /* Number of lost events */
120 unsigned int namelen; /* Number of characters not including '\0' */
121 /* The device name MUST come last */
122 char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */
125 #define BUFFER_SIZE 16384
126 #define DEVFSD_VERSION "1.3.25"
127 #define CONFIG_FILE "/etc/devfsd.conf"
128 #define MODPROBE "/sbin/modprobe"
129 #define MODPROBE_SWITCH_1 "-k"
130 #define MODPROBE_SWITCH_2 "-C"
131 #define CONFIG_MODULES_DEVFS "/etc/modules.devfs"
132 #define MAX_ARGS (6 + 1)
133 #define MAX_SUBEXPR 10
134 #define STRING_LENGTH 255
136 /* for get_uid_gid() */
140 /* fork_and_execute() */
144 /* for dir_operation() */
147 #define READ_CONFIG 2
149 /* Update only after changing code to reflect new protocol */
150 #define DEVFSD_PROTOCOL_REVISION_DAEMON 5
152 /* Compile-time check */
153 #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
154 #error protocol version mismatch. Update your kernel headers
157 #define AC_PERMISSIONS 0
160 #define AC_MFUNCTION 3 /* not supported by busybox */
161 #define AC_CFUNCTION 4 /* not supported by busybox */
164 #define AC_MKOLDCOMPAT 7
165 #define AC_MKNEWCOMPAT 8
166 #define AC_RMOLDCOMPAT 9
167 #define AC_RMNEWCOMPAT 10
168 #define AC_RESTORE 11
170 struct permissions_type
179 char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
185 const char *destination;
194 struct config_entry_struct
196 struct action_type action;
200 struct permissions_type permissions;
201 struct execute_type execute;
202 struct copy_type copy;
205 struct config_entry_struct *next;
208 struct get_variable_info
210 const struct devfsd_notify_struct *info;
212 char devpath[STRING_LENGTH];
215 static void dir_operation(int , const char * , int, unsigned long* );
216 static void service(struct stat statbuf, char *path);
217 static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *);
218 static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
219 static int mksymlink (const char *oldpath, const char *newpath);
220 static void read_config_file (char *path, int optional, unsigned long *event_mask);
221 static void process_config_line (const char *, unsigned long *);
222 static int do_servicing (int, unsigned long);
223 static void service_name (const struct devfsd_notify_struct *);
224 static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *);
225 static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *,
226 const regmatch_t *, unsigned);
227 static void action_modload (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
228 static void action_copy (const struct devfsd_notify_struct *, const struct config_entry_struct *,
229 const regmatch_t *, unsigned);
230 static void action_compat (const struct devfsd_notify_struct *, unsigned);
231 static void free_config (void);
232 static void restore(char *spath, struct stat source_stat, int rootlen);
233 static int copy_inode (const char *, const struct stat *, mode_t, const char *, const struct stat *);
234 static mode_t get_mode (const char *);
235 static void signal_handler (int);
236 static const char *get_variable (const char *, void *);
237 static int make_dir_tree (const char *);
238 static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
239 const char *, const regmatch_t *, unsigned );
240 static void expand_regexp (char *, size_t, const char *, const char *, const regmatch_t *, unsigned );
241 static const char *expand_variable( char *, unsigned, unsigned *, const char *,
242 const char *(*) (const char *, void *), void * );
243 static const char *get_variable_v2(const char *, const char *(*) (const char *, void *), void *);
244 static char get_old_ide_name (unsigned , unsigned);
245 static char *write_old_sd_name (char *, unsigned, unsigned, const char *);
247 /* busybox functions */
248 static void msg_logger(int pri, const char * fmt, ... )__attribute__ ((format (printf, 2, 3)));
249 static void msg_logger_and_die(int pri, const char * fmt, ... )__attribute__ ((noreturn, format (printf, 2, 3)));
250 static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag);
251 static void fork_and_execute(int die, char *arg0, char **arg );
252 static int get_uid_gid ( int, const char *);
253 static void safe_memcpy( char * dest, const char * src, int len);
254 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr);
255 static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr);
257 /* Structs and vars */
258 static struct config_entry_struct *first_config = NULL;
259 static struct config_entry_struct *last_config = NULL;
260 static const char *mount_point = NULL;
261 static volatile int caught_signal = FALSE;
262 static volatile int caught_sighup = FALSE;
263 static struct initial_symlink_struct
267 } initial_symlinks[] =
269 {"/proc/self/fd", "fd"},
276 static struct event_type
278 unsigned int type; /* The DEVFSD_NOTIFY_* value */
279 const char *config_name; /* The name used in the config file */
282 {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
283 {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
284 {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
285 {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
286 {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
287 {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
288 {DEVFSD_NOTIFY_CREATE, "CREATE"},
289 {DEVFSD_NOTIFY_DELETE, "DELETE"},
293 /* Busybox messages */
295 static const char * const bb_msg_proto_rev = "protocol revision";
296 static const char * const bb_msg_bad_config = "bad %s config file: %s";
297 static const char * const bb_msg_small_buffer = "buffer too small";
298 static const char * const bb_msg_variable_not_found = "variable: %s not found";
300 /* Busybox functions */
301 static void msg_logger(int pri, const char * fmt, ... )
307 ret = access ("/dev/log", F_OK);
309 openlog(applet_name, 0, LOG_DAEMON);
310 vsyslog( pri , fmt, ap);
311 /* Man: A trailing newline is added when needed. */
314 /* ENABLE_DEVFSD_VERBOSE is always enabled if msg_logger is used */
315 if ((ENABLE_DEVFSD_VERBOSE && ret) || ENABLE_DEBUG) {
316 bb_error_msg(fmt, ap);
321 static void msg_logger_and_die(int pri, const char* fmt, ...)
326 msg_logger(pri, fmt, ap);
332 #if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
333 #define devfsd_error_msg(fmt, args...) bb_error_msg(fmt, ## args)
334 #define devfsd_perror_msg_and_die(fmt, args...) bb_perror_msg_and_die(fmt, ## args)
335 #define devfsd_error_msg_and_die(fmt, args...) bb_error_msg_and_die(fmt, ## args)
336 #if defined(CONFIG_DEBUG)
337 #define debug_msg_logger(x, fmt, args...) msg_logger(x, fmt, ## args)
339 #define debug_msg_logger(x, fmt, args...)
342 #define debug_msg_logger(x, fmt, args...)
343 #define msg_logger(p, fmt, args...)
344 #define msg_logger_and_die(p, fmt, args...) exit(1)
345 #define devfsd_perror_msg_and_die(fmt, args...) exit(1)
346 #define devfsd_error_msg_and_die(fmt, args...) exit(1)
347 #define devfsd_error_msg(fmt, args...)
350 static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag)
352 if (ioctl (fd, request, event_mask_flag) == -1)
353 msg_logger_and_die(LOG_ERR, "ioctl");
356 static void fork_and_execute(int die, char *arg0, char **arg )
364 /* Parent: Error : die or return */
365 msg_logger(LOG_ERR,(char *) bb_msg_memory_exhausted);
370 /* Parent : ok : return or exit */
378 /* Child : if arg0 != NULL do execvp */
381 BB_EXECVP(arg0, arg);
382 msg_logger_and_die(LOG_ERR, "execvp");
386 static void safe_memcpy( char *dest, const char *src, int len)
388 memcpy (dest , src , len );
392 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr)
394 if(d[n - 4]=='d' && d[n - 3]=='i' && d[n - 2]=='s' && d[n - 1]=='c')
396 if(d[n - 2]=='c' && d[n - 1]=='d')
398 if(ptr[0]=='p' && ptr[1]=='a' && ptr[2]=='r' && ptr[3]=='t')
400 if(ptr[n - 2]=='m' && ptr[n - 1]=='t')
405 static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr)
407 if(d[0]=='s' && d[1]=='c' && d[2]=='s' && d[3]=='i' && d[4]=='/') {
408 if( d[n - 7]=='g' && d[n - 6]=='e' && d[n - 5]=='n' &&
409 d[n - 4]=='e' && d[n - 3]=='r' && d[n - 2]=='i' &&
412 return scan_dev_name_common(d, n, 0, ptr);
414 if(d[0]=='i' && d[1]=='d' && d[2]=='e' && d[3]=='/' &&
415 d[4]=='h' && d[5]=='o' && d[6]=='s' && d[7]=='t')
416 return scan_dev_name_common(d, n, 4, ptr);
417 if(d[0]=='s' && d[1]=='b' && d[2]=='p' && d[3]=='/')
419 if(d[0]=='v' && d[1]=='c' && d[2]=='c' && d[3]=='/')
421 if(d[0]=='p' && d[1]=='t' && d[2]=='y' && d[3]=='/')
426 /* Public functions follow */
428 int devfsd_main (int argc, char **argv);
429 int devfsd_main (int argc, char **argv)
431 int print_version = FALSE;
432 int do_daemon = TRUE;
433 int no_polling = FALSE;
435 int fd, proto_rev, count;
436 unsigned long event_mask = 0;
437 struct sigaction new_action;
438 struct initial_symlink_struct *curr;
443 for (count = 2; count < argc; ++count)
445 if(argv[count][0] == '-')
447 if(argv[count][1]=='v' && !argv[count][2]) /* -v */
448 print_version = TRUE;
449 else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='f'
450 && argv[count][2]=='g' && !argv[count][3]) /* -fg */
452 else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='n'
453 && argv[count][2]=='p' && !argv[count][3]) /* -np */
460 /* strip last / from mount point, so we don't need to check for it later */
461 while (argv[1][1]!='\0' && argv[1][strlen(argv[1])-1] == '/' )
462 argv[1][strlen(argv[1]) -1] = '\0';
464 mount_point = argv[1];
466 if (chdir (mount_point) != 0)
467 devfsd_perror_msg_and_die(mount_point);
469 fd = xopen (".devfsd", O_RDONLY);
471 if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0)
472 devfsd_perror_msg_and_die("FD_CLOEXEC");
474 if (ioctl (fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev) == -1)
475 msg_logger_and_die(LOG_ERR, "ioctl");
477 /*setup initial entries */
478 for (curr = initial_symlinks; curr->dest != NULL; ++curr)
479 symlink (curr->dest, curr->name);
481 /* NB: The check for CONFIG_FILE is done in read_config_file() */
483 if (print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)) {
484 printf("%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
485 applet_name,DEVFSD_VERSION,bb_msg_proto_rev,
486 DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev);
487 if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
488 bb_error_msg_and_die( "%s mismatch!",bb_msg_proto_rev);
489 exit(EXIT_SUCCESS); /* -v */
491 /* Tell kernel we are special (i.e. we get to see hidden entries) */
492 do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
494 sigemptyset(&new_action.sa_mask);
495 new_action.sa_flags = 0;
497 /* Set up SIGHUP and SIGUSR1 handlers */
498 new_action.sa_handler = signal_handler;
499 if (sigaction(SIGHUP, &new_action, NULL) != 0 || sigaction (SIGUSR1, &new_action, NULL) != 0 )
500 devfsd_error_msg_and_die( "sigaction");
502 printf("%s v%s started for %s\n",applet_name, DEVFSD_VERSION, mount_point);
504 /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
506 read_config_file((char*)CONFIG_FILE, FALSE, &event_mask);
507 /* Do the scan before forking, so that boot scripts see the finished product */
508 dir_operation(SERVICE,mount_point,0,NULL);
510 if (ENABLE_DEVFSD_FG_NP && no_polling)
514 /* Release so that the child can grab it */
515 do_ioctl_and_die(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
516 fork_and_execute(DIE, NULL, NULL);
517 setsid (); /* Prevent hangups and become pgrp leader */
518 } else if(ENABLE_DEVFSD_FG_NP) {
519 setpgid (0, 0); /* Become process group leader */
524 do_scan = do_servicing (fd, event_mask);
527 read_config_file ((char*)CONFIG_FILE, FALSE, &event_mask);
529 dir_operation(SERVICE,mount_point,0,NULL);
531 } /* End Function main */
534 /* Private functions follow */
536 static void read_config_file (char *path, int optional, unsigned long *event_mask)
537 /* [SUMMARY] Read a configuration database.
538 <path> The path to read the database from. If this is a directory, all
539 entries in that directory will be read (except hidden entries).
540 <optional> If TRUE, the routine will silently ignore a missing config file.
541 <event_mask> The event mask is written here. This is not initialised.
547 char buf[STRING_LENGTH];
550 debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, path);
552 if (stat (path, &statbuf) == 0 )
554 /* Don't read 0 length files: ignored */
555 /*if( statbuf.st_size == 0 )
557 if ( S_ISDIR (statbuf.st_mode) )
559 /* strip last / from dirname so we don't need to check for it later */
560 while (path && path[1]!='\0' && path[strlen(path)-1] == '/')
561 path[strlen(path) -1] = '\0';
563 dir_operation(READ_CONFIG, path, 0, event_mask);
566 if ( ( fp = fopen (path, "r") ) != NULL )
568 while (fgets (buf, STRING_LENGTH, fp) != NULL)
570 /* Skip whitespace */
571 for (line = buf; isspace (*line); ++line)
573 if (line[0] == '\0' || line[0] == '#' )
575 process_config_line (line, event_mask);
579 goto read_config_file_err;
582 read_config_file_err:
583 if(optional == 0 && errno == ENOENT)
584 msg_logger_and_die(LOG_ERR, "read config file: %s: %m", path);
586 } /* End Function read_config_file */
588 static void process_config_line (const char *line, unsigned long *event_mask)
589 /* [SUMMARY] Process a line from a configuration file.
590 <line> The configuration line.
591 <event_mask> The event mask is written here. This is not initialised.
596 struct config_entry_struct *new;
597 char p[MAX_ARGS][STRING_LENGTH];
598 char when[STRING_LENGTH], what[STRING_LENGTH];
599 char name[STRING_LENGTH];
600 const char *msg = "";
604 /* !!!! Only Uppercase Keywords in devsfd.conf */
605 static const char *const options[] = {
606 "CLEAR_CONFIG", "INCLUDE", "OPTIONAL_INCLUDE",
607 "RESTORE", "PERMISSIONS", "MODLOAD", "EXECUTE",
608 "COPY", "IGNORE", "MKOLDCOMPAT", "MKNEWCOMPAT",
609 "RMOLDCOMPAT", "RMNEWCOMPAT", 0
612 debug_msg_logger(LOG_INFO, __FUNCTION__);
614 for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0';
615 num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s",
617 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
619 i = index_in_str_array(options, when );
630 goto process_config_line_err;
632 /* "INCLUDE" & "OPTIONAL_INCLUDE" */
633 if( i == 1 || i == 2 )
635 st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL );
636 msg_logger(LOG_INFO, "%sinclude: %s",(toupper (when[0]) == 'I') ? "": "optional_", name);
637 read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask);
643 dir_operation(RESTORE,name, strlen (name),NULL);
647 goto process_config_line_err;
649 new = xmalloc (sizeof *new);
650 memset (new, 0, sizeof *new);
652 for (count = 0; event_types[count].config_name != NULL; ++count)
654 if (strcasecmp (when, event_types[count].config_name) != 0)
656 new->action.when = event_types[count].type;
659 if (event_types[count].config_name == NULL)
662 goto process_config_line_err;
665 i = index_in_str_array(options, what );
669 case 4: /* "PERMISSIONS" */
670 new->action.what = AC_PERMISSIONS;
671 /* Get user and group */
672 if ( ( ptr = strchr (p[0], '.') ) == NULL )
675 goto process_config_line_err; /*"missing '.' in UID.GID"*/
679 new->u.permissions.uid = get_uid_gid (UID, p[0]);
680 new->u.permissions.gid = get_uid_gid (GID, ptr);
682 new->u.permissions.mode = get_mode (p[1]);
684 case 5: /* MODLOAD */
685 /*This action will pass "/dev/$devname" (i.e. "/dev/" prefixed to
686 the device name) to the module loading facility. In addition,
687 the /etc/modules.devfs configuration file is used.*/
688 if (ENABLE_DEVFSD_MODLOAD)
689 new->action.what = AC_MODLOAD;
691 case 6: /* EXECUTE */
692 new->action.what = AC_EXECUTE;
695 for (count = 0; count < num_args; ++count)
696 new->u.execute.argv[count] = xstrdup (p[count]);
698 new->u.execute.argv[num_args] = NULL;
701 new->action.what = AC_COPY;
704 goto process_config_line_err; /* missing path and function in line */
706 new->u.copy.source = xstrdup (p[0]);
707 new->u.copy.destination = xstrdup (p[1]);
711 case 9: /* MKOLDCOMPAT */
713 case 10: /* MKNEWCOMPAT */
715 case 11:/* RMOLDCOMPAT */
717 case 12: /* RMNEWCOMPAT */
723 new->action.what = i - 2;
727 goto process_config_line_err;
731 xregcomp( &new->preg, name, REG_EXTENDED);
733 *event_mask |= 1 << new->action.when;
735 if (first_config == NULL)
738 last_config->next = new;
741 process_config_line_err:
742 msg_logger_and_die(LOG_ERR, bb_msg_bad_config, msg , line);
743 } /* End Function process_config_line */
745 static int do_servicing (int fd, unsigned long event_mask)
746 /* [SUMMARY] Service devfs changes until a signal is received.
747 <fd> The open control file.
748 <event_mask> The event mask.
749 [RETURNS] TRUE if SIGHUP was caught, else FALSE.
753 struct devfsd_notify_struct info;
754 unsigned long tmp_event_mask;
756 debug_msg_logger(LOG_INFO, __FUNCTION__);
758 /* Tell devfs what events we care about */
759 tmp_event_mask = event_mask;
760 do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
761 while (!caught_signal)
764 bytes = read (fd, (char *) &info, sizeof info);
766 break; /* Must test for this first */
768 continue; /* Yes, the order is important */
771 service_name (&info);
775 int c_sighup = caught_sighup;
777 caught_signal = FALSE;
778 caught_sighup = FALSE;
781 msg_logger_and_die(LOG_ERR, "read error on control file");
782 } /* End Function do_servicing */
784 static void service_name (const struct devfsd_notify_struct *info)
785 /* [SUMMARY] Service a single devfs change.
786 <info> The devfs change.
791 regmatch_t mbuf[MAX_SUBEXPR];
792 struct config_entry_struct *entry;
794 debug_msg_logger(LOG_INFO, __FUNCTION__);
795 if (ENABLE_DEBUG && info->overrun_count > 0)
796 debug_msg_logger(LOG_ERR, "lost %u events", info->overrun_count);
798 /* Discard lookups on "/dev/log" and "/dev/initctl" */
799 if( info->type == DEVFSD_NOTIFY_LOOKUP &&
800 ((info->devname[0]=='l' && info->devname[1]=='o' &&
801 info->devname[2]=='g' && !info->devname[3]) ||
802 ( info->devname[0]=='i' && info->devname[1]=='n' &&
803 info->devname[2]=='i' && info->devname[3]=='t' &&
804 info->devname[4]=='c' && info->devname[5]=='t' &&
805 info->devname[6]=='l' && !info->devname[7])))
807 for (entry = first_config; entry != NULL; entry = entry->next)
809 /* First check if action matches the type, then check if name matches */
810 if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 )
812 for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
815 debug_msg_logger(LOG_INFO, "%s: action.what %d", __FUNCTION__, entry->action.what);
817 switch (entry->action.what)
820 action_permissions (info, entry);
823 if(ENABLE_DEVFSD_MODLOAD)
824 action_modload (info, entry);
827 action_execute (info, entry, mbuf, n);
830 action_copy (info, entry, mbuf, n);
839 action_compat (info, entry->action.what);
842 msg_logger_and_die(LOG_ERR, "Unknown action");
845 } /* End Function service_name */
847 static void action_permissions (const struct devfsd_notify_struct *info,
848 const struct config_entry_struct *entry)
849 /* [SUMMARY] Update permissions for a device entry.
850 <info> The devfs change.
851 <entry> The config file entry.
857 debug_msg_logger(LOG_INFO, __FUNCTION__);
859 if ( stat (info->devname, &statbuf) != 0 ||
860 chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 ||
861 chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0)
863 msg_logger(LOG_ERR, "Can't chmod or chown: %s: %m",info->devname);
865 } /* End Function action_permissions */
867 static void action_modload (const struct devfsd_notify_struct *info,
868 const struct config_entry_struct *entry ATTRIBUTE_UNUSED)
869 /* [SUMMARY] Load a module.
870 <info> The devfs change.
871 <entry> The config file entry.
876 char device[STRING_LENGTH];
878 argv[0] = (char*)MODPROBE;
879 argv[1] = (char*)MODPROBE_SWITCH_1; /* "-k" */
880 argv[2] = (char*)MODPROBE_SWITCH_2; /* "-C" */
881 argv[3] = (char*)CONFIG_MODULES_DEVFS;
885 snprintf (device, sizeof (device), "/dev/%s", info->devname);
886 debug_msg_logger(LOG_INFO, "%s: %s %s %s %s %s",__FUNCTION__, argv[0],argv[1],argv[2],argv[3],argv[4]);
887 fork_and_execute(DIE, argv[0], argv);
888 } /* End Function action_modload */
890 static void action_execute (const struct devfsd_notify_struct *info,
891 const struct config_entry_struct *entry,
892 const regmatch_t *regexpr, unsigned int numexpr)
893 /* [SUMMARY] Execute a programme.
894 <info> The devfs change.
895 <entry> The config file entry.
896 <regexpr> The number of subexpression (start, end) offsets within the
898 <numexpr> The number of elements within <<regexpr>>.
903 struct get_variable_info gv_info;
904 char *argv[MAX_ARGS + 1];
905 char largv[MAX_ARGS + 1][STRING_LENGTH];
907 debug_msg_logger(LOG_INFO ,__FUNCTION__);
909 gv_info.devname = info->devname;
910 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
911 for (count = 0; entry->u.execute.argv[count] != NULL; ++count)
913 expand_expression (largv[count], STRING_LENGTH,
914 entry->u.execute.argv[count],
915 get_variable, &gv_info,
916 gv_info.devname, regexpr, numexpr );
917 argv[count] = largv[count];
920 fork_and_execute(NO_DIE, argv[0], argv);
921 } /* End Function action_execute */
924 static void action_copy (const struct devfsd_notify_struct *info,
925 const struct config_entry_struct *entry,
926 const regmatch_t *regexpr, unsigned int numexpr)
927 /* [SUMMARY] Copy permissions.
928 <info> The devfs change.
929 <entry> The config file entry.
930 <regexpr> This list of subexpression (start, end) offsets within the
932 <numexpr> The number of elements in <<regexpr>>.
937 struct get_variable_info gv_info;
938 struct stat source_stat, dest_stat;
939 char source[STRING_LENGTH], destination[STRING_LENGTH];
942 debug_msg_logger(LOG_INFO, __FUNCTION__);
944 dest_stat.st_mode = 0;
946 if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) )
949 gv_info.devname = info->devname;
951 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
952 expand_expression (source, STRING_LENGTH, entry->u.copy.source,
953 get_variable, &gv_info, gv_info.devname,
956 expand_expression (destination, STRING_LENGTH, entry->u.copy.destination,
957 get_variable, &gv_info, gv_info.devname,
960 if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0)
962 lstat (destination, &dest_stat);
963 new_mode = source_stat.st_mode & ~S_ISVTX;
964 if (info->type == DEVFSD_NOTIFY_CREATE)
966 else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) )
968 ret = copy_inode (destination, &dest_stat, new_mode, source, &source_stat);
969 if (ENABLE_DEBUG && ret && (errno != EEXIST))
970 debug_msg_logger(LOG_ERR, "copy_inode: %s to %s: %m", source, destination);
971 } /* End Function action_copy */
973 static void action_compat (const struct devfsd_notify_struct *info, unsigned int action)
974 /* [SUMMARY] Process a compatibility request.
975 <info> The devfs change.
976 <action> The action to take.
981 const char *compat_name = NULL;
982 const char *dest_name = info->devname;
984 char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
985 int mode, host, bus, target, lun;
988 /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
989 static const char *const fmt[] = {
991 "sg/c%db%dt%du%d", /* scsi/generic */
992 "sd/c%db%dt%du%d", /* scsi/disc */
993 "sr/c%db%dt%du%d", /* scsi/cd */
994 "sd/c%db%dt%du%dp%d", /* scsi/part */
995 "st/c%db%dt%du%dm%d%c", /* scsi/mt */
996 "ide/hd/c%db%dt%du%d", /* ide/host/disc */
997 "ide/cd/c%db%dt%du%d", /* ide/host/cd */
998 "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
999 "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
1003 /* First construct compatibility name */
1006 case AC_MKOLDCOMPAT:
1007 case AC_RMOLDCOMPAT:
1008 compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor);
1010 case AC_MKNEWCOMPAT:
1011 case AC_RMNEWCOMPAT:
1012 ptr = strrchr (info->devname, '/') + 1;
1013 i=scan_dev_name(info->devname, info->namelen, ptr);
1015 debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i);
1021 sscanf (info->devname +((i<6)?5:4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
1022 snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + ((i>5)?4:0));
1023 dest_name = dest_buf;
1024 compat_name = compat_buf;
1027 /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
1028 if( i == 1 || i == 2 || i == 3 || i == 6 || i ==7 )
1029 sprintf ( compat_buf, fmt[i], host, bus, target, lun);
1031 /* 4 == scsi/part 8 == ide/host/part */
1032 if( i == 4 || i == 8)
1033 sprintf ( compat_buf, fmt[i], host, bus, target, lun, atoi (ptr + 4) );
1038 rewind_ = info->devname[info->namelen - 1];
1042 if(ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
1043 mode = ptr[2] - 107; /* 1 or 2 */
1046 sprintf (compat_buf, fmt [i], host, bus, target, lun, mode, rewind_);
1049 /* 9 == ide/host/mt */
1051 snprintf (compat_buf, sizeof (compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
1053 } /* switch (action) */
1055 if(compat_name == NULL )
1058 debug_msg_logger( LOG_INFO, "%s: %s", __FUNCTION__, compat_name);
1060 /* Now decide what to do with it */
1063 case AC_MKOLDCOMPAT:
1064 case AC_MKNEWCOMPAT:
1065 mksymlink (dest_name, compat_name);
1067 case AC_RMOLDCOMPAT:
1068 case AC_RMNEWCOMPAT:
1069 ret = unlink (compat_name);
1070 if (ENABLE_DEBUG && ret)
1071 debug_msg_logger(LOG_ERR, "unlink: %s: %m", compat_name);
1074 } /* switch (action) */
1075 } /* End Function action_compat */
1077 static void restore(char *spath, struct stat source_stat, int rootlen)
1079 char dpath[STRING_LENGTH];
1080 struct stat dest_stat;
1082 debug_msg_logger(LOG_INFO, __FUNCTION__);
1084 dest_stat.st_mode = 0;
1085 snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen);
1086 lstat (dpath, &dest_stat);
1088 if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) )
1089 copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
1091 if ( S_ISDIR (source_stat.st_mode) )
1092 dir_operation(RESTORE, spath, rootlen,NULL);
1096 static int copy_inode (const char *destpath, const struct stat *dest_stat,
1098 const char *sourcepath, const struct stat *source_stat)
1099 /* [SUMMARY] Copy an inode.
1100 <destpath> The destination path. An existing inode may be deleted.
1101 <dest_stat> The destination stat(2) information.
1102 <new_mode> The desired new mode for the destination.
1103 <sourcepath> The source path.
1104 <source_stat> The source stat(2) information.
1105 [RETURNS] TRUE on success, else FALSE.
1108 int source_len, dest_len;
1109 char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
1111 struct sockaddr_un un_addr;
1112 char symlink_val[STRING_LENGTH];
1114 debug_msg_logger(LOG_INFO, __FUNCTION__);
1116 if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) )
1119 if ( S_ISLNK (source_stat->st_mode) )
1121 if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 ||
1122 ( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 )
1124 source_link[source_len] = '\0';
1125 dest_link[dest_len] = '\0';
1126 if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) )
1129 symlink (source_link, destpath);
1132 } /* Else not a symlink */
1133 chmod (destpath, new_mode & ~S_IFMT);
1134 chown (destpath, source_stat->st_uid, source_stat->st_gid);
1137 /* Different types: unlink and create */
1139 switch (source_stat->st_mode & S_IFMT)
1142 if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 )
1144 un_addr.sun_family = AF_UNIX;
1145 snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath);
1146 val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr);
1148 if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0)
1152 if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 )
1154 symlink_val[val] = '\0';
1155 if (symlink (symlink_val, destpath) == 0)
1159 if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 )
1162 if (chmod (destpath, new_mode & ~S_IFMT) != 0)
1168 if (mknod (destpath, new_mode, source_stat->st_rdev) != 0)
1172 if (mkdir (destpath, new_mode & ~S_IFMT) != 0)
1175 if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
1180 } /* End Function copy_inode */
1182 static void free_config (void)
1183 /* [SUMMARY] Free the configuration information.
1187 struct config_entry_struct *c_entry;
1190 debug_msg_logger(LOG_INFO, __FUNCTION__);
1192 for (c_entry = first_config; c_entry != NULL; c_entry = next)
1196 next = c_entry->next;
1197 regfree (&c_entry->preg);
1198 if (c_entry->action.what == AC_EXECUTE)
1200 for (count = 0; count < MAX_ARGS; ++count)
1202 if (c_entry->u.execute.argv[count] == NULL)
1204 free (c_entry->u.execute.argv[count]);
1209 first_config = NULL;
1211 } /* End Function free_config */
1213 static int get_uid_gid (int flag, const char *string)
1214 /* [SUMMARY] Convert a string to a UID or GID value.
1215 <flag> "UID" or "GID".
1216 <string> The string.
1217 [RETURNS] The UID or GID value.
1220 struct passwd *pw_ent;
1221 struct group *grp_ent;
1222 static const char *msg;
1224 if (ENABLE_DEVFSD_VERBOSE)
1227 debug_msg_logger(LOG_INFO, __FUNCTION__);
1229 if(ENABLE_DEBUG && flag != UID && flag != GID)
1230 msg_logger_and_die(LOG_ERR,"%s: flag != UID && flag != GID", __FUNCTION__);
1232 if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) )
1233 return atoi(string);
1235 if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL )
1236 return pw_ent->pw_uid;
1238 if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL )
1239 return grp_ent->gr_gid;
1240 else if(ENABLE_DEVFSD_VERBOSE)
1243 if(ENABLE_DEVFSD_VERBOSE)
1244 msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]);
1246 }/* End Function get_uid_gid */
1248 static mode_t get_mode (const char *string)
1249 /* [SUMMARY] Convert a string to a mode value.
1250 <string> The string.
1251 [RETURNS] The mode value.
1257 debug_msg_logger(LOG_INFO, __FUNCTION__);
1259 if ( isdigit (string[0]) )
1260 return strtoul(string, NULL, 8);
1261 if (strlen (string) != 9)
1262 msg_logger_and_die(LOG_ERR, "bad mode: %s", string);
1268 if(string[0]=='r'||string[0]=='w'||string[0]=='x')
1274 } /* End Function get_mode */
1276 static void signal_handler (int sig)
1278 debug_msg_logger(LOG_INFO, __FUNCTION__);
1280 caught_signal = TRUE;
1282 caught_sighup = TRUE;
1284 msg_logger(LOG_INFO, "Caught signal %d", sig);
1285 } /* End Function signal_handler */
1287 static const char *get_variable (const char *variable, void *info)
1289 struct get_variable_info *gv_info = info;
1290 static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH];
1291 const char *field_names[] = { "hostname", "mntpt", "devpath", "devname",
1292 "uid", "gid", "mode", hostname, mount_point,
1293 gv_info->devpath, gv_info->devname, 0 };
1296 debug_msg_logger(LOG_INFO, __FUNCTION__);
1298 if (gethostname (hostname, STRING_LENGTH - 1) != 0)
1299 msg_logger_and_die(LOG_ERR, "gethostname: %m");
1301 /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
1302 hostname[STRING_LENGTH - 1] = '\0';
1304 /* index_in_str_array returns i>=0 */
1305 i=index_in_str_array(field_names, variable);
1307 if ( i > 6 || i < 0 || (i > 1 && gv_info == NULL))
1309 if( i >= 0 && i <= 3)
1311 debug_msg_logger(LOG_INFO, "%s: i=%d %s", __FUNCTION__, i ,field_names[i+7]);
1312 return field_names[i+7];
1316 sprintf (sbuf, "%u", gv_info->info->uid);
1318 sprintf (sbuf, "%u", gv_info->info->gid);
1320 sprintf (sbuf, "%o", gv_info->info->mode);
1322 debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, sbuf);
1325 } /* End Function get_variable */
1327 static void service(struct stat statbuf, char *path)
1329 struct devfsd_notify_struct info;
1331 debug_msg_logger(LOG_INFO, __FUNCTION__);
1333 memset (&info, 0, sizeof info);
1334 info.type = DEVFSD_NOTIFY_REGISTERED;
1335 info.mode = statbuf.st_mode;
1336 info.major = major (statbuf.st_rdev);
1337 info.minor = minor (statbuf.st_rdev);
1338 info.uid = statbuf.st_uid;
1339 info.gid = statbuf.st_gid;
1340 snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1);
1341 info.namelen = strlen (info.devname);
1342 service_name (&info);
1343 if ( S_ISDIR (statbuf.st_mode) )
1344 dir_operation(SERVICE,path,0,NULL);
1347 static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
1348 /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
1349 <flag> To choose which function to perform
1350 <dp> The directory pointer. This is closed upon completion.
1351 <dir_name> The name of the directory.
1352 <rootlen> string length parameter.
1356 struct stat statbuf;
1359 char path[STRING_LENGTH];
1361 debug_msg_logger(LOG_INFO, __FUNCTION__);
1363 if((dp = opendir( dir_name))==NULL)
1365 debug_msg_logger(LOG_ERR, "opendir: %s: %m", dir_name);
1369 while ( (de = readdir (dp) ) != NULL )
1372 if(de->d_name && *de->d_name == '.' && (!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2])))
1374 snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name);
1375 debug_msg_logger(LOG_ERR, "%s: %s", __FUNCTION__, path);
1377 if (lstat (path, &statbuf) != 0)
1379 debug_msg_logger(LOG_ERR, "%s: %s: %m", __FUNCTION__, path);
1385 service(statbuf,path);
1388 restore(path, statbuf, var);
1391 read_config_file (path, var, event_mask);
1396 } /* End Function do_scan_and_service */
1398 static int mksymlink (const char *oldpath, const char *newpath)
1399 /* [SUMMARY] Create a symlink, creating intervening directories as required.
1400 <oldpath> The string contained in the symlink.
1401 <newpath> The name of the new symlink.
1402 [RETURNS] 0 on success, else -1.
1405 debug_msg_logger(LOG_INFO, __FUNCTION__);
1407 if ( !make_dir_tree (newpath) )
1410 if (symlink (oldpath, newpath) != 0) {
1411 if (errno != EEXIST) {
1412 debug_msg_logger(LOG_ERR, "%s: %s to %s: %m", __FUNCTION__, oldpath, newpath);
1417 } /* End Function mksymlink */
1420 static int make_dir_tree (const char *path)
1421 /* [SUMMARY] Creating intervening directories for a path as required.
1422 <path> The full pathname (including the leaf node).
1423 [RETURNS] TRUE on success, else FALSE.
1426 debug_msg_logger(LOG_INFO, __FUNCTION__);
1428 if (bb_make_directory( dirname((char *)path), -1, FILEUTILS_RECUR )==-1)
1430 debug_msg_logger(LOG_ERR, "%s: %s: %m",__FUNCTION__, path);
1434 } /* End Function make_dir_tree */
1436 static int expand_expression(char *output, unsigned int outsize,
1438 const char *(*get_variable_func)(const char *variable, void *info),
1440 const char *devname,
1441 const regmatch_t *ex, unsigned int numexp)
1442 /* [SUMMARY] Expand environment variables and regular subexpressions in string.
1443 <output> The output expanded expression is written here.
1444 <length> The size of the output buffer.
1445 <input> The input expression. This may equal <<output>>.
1446 <get_variable> A function which will be used to get variable values. If
1447 this returns NULL, the environment is searched instead. If this is NULL,
1448 only the environment is searched.
1449 <info> An arbitrary pointer passed to <<get_variable>>.
1450 <devname> Device name; specifically, this is the string that contains all
1451 of the regular subexpressions.
1452 <ex> Array of start / end offsets into info->devname for each subexpression
1453 <numexp> Number of regular subexpressions found in <<devname>>.
1454 [RETURNS] TRUE on success, else FALSE.
1457 char temp[STRING_LENGTH];
1459 debug_msg_logger(LOG_INFO, __FUNCTION__);
1461 if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) )
1463 expand_regexp (output, outsize, temp, devname, ex, numexp);
1465 } /* End Function expand_expression */
1467 static void expand_regexp (char *output, size_t outsize, const char *input,
1468 const char *devname,
1469 const regmatch_t *ex, unsigned int numex )
1470 /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
1471 <output> The output expanded expression is written here.
1472 <outsize> The size of the output buffer.
1473 <input> The input expression. This may NOT equal <<output>>, because
1474 supporting that would require yet another string-copy. However, it's not
1475 hard to write a simple wrapper function to add this functionality for those
1476 few cases that need it.
1477 <devname> Device name; specifically, this is the string that contains all
1478 of the regular subexpressions.
1479 <ex> An array of start and end offsets into <<devname>>, one for each
1481 <numex> Number of subexpressions in the offset-array <<ex>>.
1485 const char last_exp = '0' - 1 + numex;
1488 debug_msg_logger(LOG_INFO, __FUNCTION__);
1490 /* Guarantee NULL termination by writing an explicit '\0' character into
1491 the very last byte */
1493 output[--outsize] = '\0';
1494 /* Copy the input string into the output buffer, replacing '\\' with '\'
1495 and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
1496 codes are deleted */
1497 while ( (c != '\0') && (outsize != 0) )
1507 if ((c >= '0') && (c <= last_exp))
1509 const regmatch_t *subexp = ex + (c - '0');
1510 unsigned int sublen = subexp->rm_eo - subexp->rm_so;
1512 /* Range checking */
1513 if (sublen > outsize)
1515 strncpy (output, devname + subexp->rm_so, sublen);
1526 } /* End Function expand_regexp */
1529 /* from compat_name.c */
1531 struct translate_struct
1533 const char *match; /* The string to match to (up to length) */
1534 const char *format; /* Format of output, "%s" takes data past match string,
1535 NULL is effectively "%s" (just more efficient) */
1538 static struct translate_struct translate_table[] =
1541 {"printers/", "lp%s"},
1543 {"parports/", "parport%s"},
1546 {"loop/", "loop%s"},
1547 {"floppy/", "fd%s"},
1549 {"md/", "md%s"}, /* Meta-devices */
1553 {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
1555 {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
1556 {"tts/E", "ttyE%s"}, /* Stallion serial driver */
1557 {"cua/E", "cue%s"}, /* Stallion serial driver callout */
1558 {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
1559 {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
1560 {"ip2/", "ip2%s"}, /* Computone serial driver control */
1561 {"tts/F", "ttyF%s"}, /* Computone serial driver */
1562 {"cua/F", "cuf%s"}, /* Computone serial driver callout */
1563 {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
1564 {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
1565 {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
1566 {"cua/", "cua%s"}, /* Generic serial: must be after others */
1567 {"input/js", "js%s"}, /* Joystick driver */
1571 const char *get_old_name (const char *devname, unsigned int namelen,
1572 char *buffer, unsigned int major, unsigned int minor)
1573 /* [SUMMARY] Translate a kernel-supplied name into an old name.
1574 <devname> The device name provided by the kernel.
1575 <namelen> The length of the name.
1576 <buffer> A buffer that may be used. This should be at least 128 bytes long.
1577 <major> The major number for the device.
1578 <minor> The minor number for the device.
1579 [RETURNS] A pointer to the old name if known, else NULL.
1582 const char *compat_name = NULL;
1584 struct translate_struct *trans;
1591 /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
1592 static const char *const fmt[] = {
1594 "sg%u", /* scsi/generic */
1595 NULL, /* scsi/disc */
1596 "sr%u", /* scsi/cd */
1597 NULL, /* scsi/part */
1598 "nst%u%c", /* scsi/mt */
1599 "hd%c" , /* ide/host/disc */
1600 "hd%c" , /* ide/host/cd */
1601 "hd%c%s", /* ide/host/part */
1602 "%sht%d", /* ide/host/mt */
1603 "sbpcd%u", /* sbp/ */
1605 "%cty%c%c", /* pty/ */
1609 debug_msg_logger(LOG_INFO, __FUNCTION__);
1611 for (trans = translate_table; trans->match != NULL; ++trans)
1613 len = strlen (trans->match);
1615 if (strncmp (devname, trans->match, len) == 0)
1617 if (trans->format == NULL)
1618 return devname + len;
1619 sprintf (buffer, trans->format, devname + len);
1624 ptr = (strrchr (devname, '/') + 1);
1625 i = scan_dev_name(devname, namelen, ptr);
1627 if( i > 0 && i < 13)
1628 compat_name = buffer;
1632 debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i);
1634 /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
1635 if( i == 1 || i == 3 || i == 10 )
1636 sprintf (buffer, fmt[i], minor);
1638 /* 2 ==scsi/disc, 4 == scsi/part */
1639 if( i == 2 || i == 4)
1640 compat_name = write_old_sd_name (buffer, major, minor,((i == 2)?"":(ptr + 4)));
1648 sprintf (buffer, fmt[i], minor & 0x1f, mode);
1649 if (devname[namelen - 1] != 'n')
1652 /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
1653 if( i == 6 || i == 7 || i == 8 )
1654 /* last arg should be ignored for i == 6 or i== 7 */
1655 sprintf (buffer, fmt[i] , get_old_ide_name (major, minor), ptr + 4);
1657 /* 9 == ide/host/mt */
1659 sprintf (buffer, fmt[i], ptr + 2, minor & 0x7f);
1664 sprintf (buffer, fmt[i], devname + 4);
1665 if (buffer[3] == '0')
1671 pty1 = "pqrstuvwxyzabcde";
1672 pty2 = "0123456789abcdef";
1673 indexx = atoi (devname + 5);
1674 sprintf (buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
1677 if(ENABLE_DEBUG && compat_name!=NULL)
1678 msg_logger(LOG_INFO, "%s: compat_name %s", __FUNCTION__, compat_name);
1681 } /* End Function get_old_name */
1683 static char get_old_ide_name (unsigned int major, unsigned int minor)
1684 /* [SUMMARY] Get the old IDE name for a device.
1685 <major> The major number for the device.
1686 <minor> The minor number for the device.
1687 [RETURNS] The drive letter.
1690 char letter='y'; /* 121 */
1691 char c='a'; /* 97 */
1694 debug_msg_logger(LOG_INFO, __FUNCTION__);
1696 /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
1698 if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR ||
1699 i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR ||
1700 i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR ||
1703 if((unsigned int)i==major)
1711 } while (i<=IDE9_MAJOR);
1716 } /* End Function get_old_ide_name */
1718 static char *write_old_sd_name (char *buffer,
1719 unsigned int major, unsigned int minor,
1721 /* [SUMMARY] Write the old SCSI disc name to a buffer.
1722 <buffer> The buffer to write to.
1723 <major> The major number for the device.
1724 <minor> The minor number for the device.
1725 <part> The partition string. Must be "" for a whole-disc entry.
1726 [RETURNS] A pointer to the buffer on success, else NULL.
1729 unsigned int disc_index;
1731 debug_msg_logger(LOG_INFO, __FUNCTION__);
1735 sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part);
1738 if ( (major > 64) && (major < 72) )
1740 disc_index = ( (major - 64) << 4 ) + (minor >> 4);
1741 if (disc_index < 26)
1742 sprintf (buffer, "sd%c%s", 'a' + disc_index, part);
1744 sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part);
1748 } /* End Function write_old_sd_name */
1753 /*EXPERIMENTAL_FUNCTION*/
1755 int st_expr_expand (char *output, unsigned int length, const char *input,
1756 const char *(*get_variable_func) (const char *variable,
1759 /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
1760 <output> The output expanded expression is written here.
1761 <length> The size of the output buffer.
1762 <input> The input expression. This may equal <<output>>.
1763 <get_variable> A function which will be used to get variable values. If
1764 this returns NULL, the environment is searched instead. If this is NULL,
1765 only the environment is searched.
1766 <info> An arbitrary pointer passed to <<get_variable>>.
1767 [RETURNS] TRUE on success, else FALSE.
1772 unsigned int out_pos = 0;
1775 struct passwd *pwent;
1776 char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
1778 debug_msg_logger(LOG_INFO, __FUNCTION__);
1780 if (length > BUFFER_SIZE)
1781 length = BUFFER_SIZE;
1782 for (; TRUE; ++input)
1784 switch (ch = *input)
1787 /* Variable expansion */
1788 input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info);
1793 /* Home directory expansion */
1795 if ( isspace (ch) || (ch == '/') || (ch == '\0') )
1797 /* User's own home directory: leave separator for next time */
1798 if ( ( env = getenv ("HOME") ) == NULL )
1800 msg_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
1804 if (len + out_pos >= length)
1805 goto st_expr_expand_out;
1806 memcpy (buffer + out_pos, env, len + 1);
1810 /* Someone else's home directory */
1811 for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
1814 if (len >= sizeof tmp)
1815 goto st_expr_expand_out;
1816 safe_memcpy (tmp, input, len);
1818 if ( ( pwent = getpwnam (tmp) ) == NULL )
1820 msg_logger(LOG_INFO, "no pwent for: %s", tmp);
1823 len = strlen (pwent->pw_dir);
1824 if (len + out_pos >= length)
1825 goto st_expr_expand_out;
1826 memcpy (buffer + out_pos, pwent->pw_dir, len + 1);
1832 if (out_pos >= length)
1833 goto st_expr_expand_out;
1834 buffer[out_pos++] = ch;
1837 memcpy (output, buffer, out_pos);
1846 msg_logger(LOG_INFO, bb_msg_small_buffer);
1848 } /* End Function st_expr_expand */
1851 /* Private functions follow */
1853 static const char *expand_variable (char *buffer, unsigned int length,
1854 unsigned int *out_pos, const char *input,
1855 const char *(*func) (const char *variable,
1858 /* [SUMMARY] Expand a variable.
1859 <buffer> The buffer to write to.
1860 <length> The length of the output buffer.
1861 <out_pos> The current output position. This is updated.
1862 <input> A pointer to the input character pointer.
1863 <func> A function which will be used to get variable values. If this
1864 returns NULL, the environment is searched instead. If this is NULL, only
1865 the environment is searched.
1866 <info> An arbitrary pointer passed to <<func>>.
1867 <errfp> Diagnostic messages are written here.
1868 [RETURNS] A pointer to the end of this subexpression on success, else NULL.
1873 unsigned int open_braces;
1874 const char *env, *ptr;
1875 char tmp[STRING_LENGTH];
1877 debug_msg_logger(LOG_INFO, __FUNCTION__);
1882 /* Special case for "$$": PID */
1883 sprintf ( tmp, "%d", (int) getpid () );
1885 if (len + *out_pos >= length)
1886 goto expand_variable_out;
1888 memcpy (buffer + *out_pos, tmp, len + 1);
1892 /* Ordinary variable expansion, possibly in braces */
1895 /* Simple variable expansion */
1896 for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr)
1899 if ((size_t)len >= sizeof tmp)
1900 goto expand_variable_out;
1902 safe_memcpy (tmp, input, len);
1904 if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL )
1906 msg_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
1910 if (len + *out_pos >= length)
1911 goto expand_variable_out;
1913 memcpy (buffer + *out_pos, env, len + 1);
1917 /* Variable in braces: check for ':' tricks */
1919 for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr)
1923 /* Must be simple variable expansion with "${var}" */
1925 if ((size_t)len >= sizeof tmp)
1926 goto expand_variable_out;
1928 safe_memcpy (tmp, input, len);
1929 ptr = expand_variable (buffer, length, out_pos, tmp, func, info );
1934 if (ch != ':' || ptr[1] != '-' )
1936 msg_logger(LOG_INFO, "illegal char in var name");
1939 /* It's that handy "${var:-word}" expression. Check if var is defined */
1941 if ((size_t)len >= sizeof tmp)
1942 goto expand_variable_out;
1944 safe_memcpy (tmp, input, len);
1945 /* Move input pointer to ':' */
1947 /* First skip to closing brace, taking note of nested expressions */
1950 for (open_braces = 1; open_braces > 0; ch = *++ptr)
1961 msg_logger(LOG_INFO,"\"}\" not found in: %s", input);
1968 /* At this point ptr should point to closing brace of "${var:-word}" */
1969 if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL )
1971 /* Found environment variable, so skip the input to the closing brace
1972 and return the variable */
1975 if (len + *out_pos >= length)
1976 goto expand_variable_out;
1978 memcpy (buffer + *out_pos, env, len + 1);
1982 /* Environment variable was not found, so process word. Advance input
1983 pointer to start of word in "${var:-word}" */
1986 if ((size_t)len >= sizeof tmp)
1987 goto expand_variable_out;
1989 safe_memcpy (tmp, input, len);
1991 if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) )
1994 if (len + *out_pos >= length)
1995 goto expand_variable_out;
1997 memcpy (buffer + *out_pos, tmp, len + 1);
2000 expand_variable_out:
2001 msg_logger(LOG_INFO, bb_msg_small_buffer);
2003 } /* End Function expand_variable */
2006 static const char *get_variable_v2 (const char *variable,
2007 const char *(*func) (const char *variable, void *info),
2009 /* [SUMMARY] Get a variable from the environment or .
2010 <variable> The variable name.
2011 <func> A function which will be used to get the variable. If this returns
2012 NULL, the environment is searched instead. If this is NULL, only the
2013 environment is searched.
2014 [RETURNS] The value of the variable on success, else NULL.
2019 debug_msg_logger(LOG_INFO, __FUNCTION__);
2023 value = (*func) (variable, info);
2027 return getenv(variable);
2028 } /* End Function get_variable */