2 devfsd implementation for busybox
4 Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
6 Busybox version is based on some previous work and ideas
7 Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it>
11 Main file for devfsd (devfs daemon for Linux).
13 Copyright (C) 1998-2002 Richard Gooch
17 Header file for devfsd (devfs daemon for Linux).
19 Copyright (C) 1998-2000 Richard Gooch
23 Compatibility name file for devfsd (build compatibility names).
25 Copyright (C) 1998-2002 Richard Gooch
29 This code provides Borne Shell-like expression expansion.
31 Copyright (C) 1997-1999 Richard Gooch
33 This program is free software; you can redistribute it and/or modify
34 it under the terms of the GNU General Public License as published by
35 the Free Software Foundation; either version 2 of the License, or
36 (at your option) any later version.
38 This program is distributed in the hope that it will be useful,
39 but WITHOUT ANY WARRANTY; without even the implied warranty of
40 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
41 GNU General Public License for more details.
43 You should have received a copy of the GNU General Public License
44 along with this program; if not, write to the Free Software
45 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
47 Richard Gooch may be reached by email at rgooch@atnf.csiro.au
48 The postal address is:
49 Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
62 #include <sys/types.h>
64 #include <sys/ioctl.h>
65 #include <sys/socket.h>
72 #include <sys/sysmacros.h>
75 /* Various defines taken from linux/major.h */
88 /* Various defines taken from linux/devfs_fs.h */
89 #define DEVFSD_PROTOCOL_REVISION_KERNEL 5
90 #define DEVFSD_IOCTL_BASE 'd'
91 /* These are the various ioctls */
92 #define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int)
93 #define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int)
94 #define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int)
95 #define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int)
96 #define DEVFSD_NOTIFY_REGISTERED 0
97 #define DEVFSD_NOTIFY_UNREGISTERED 1
98 #define DEVFSD_NOTIFY_ASYNC_OPEN 2
99 #define DEVFSD_NOTIFY_CLOSE 3
100 #define DEVFSD_NOTIFY_LOOKUP 4
101 #define DEVFSD_NOTIFY_CHANGE 5
102 #define DEVFSD_NOTIFY_CREATE 6
103 #define DEVFSD_NOTIFY_DELETE 7
104 #define DEVFS_PATHLEN 1024
105 /* Never change this otherwise the binary interface will change */
107 struct devfsd_notify_struct
108 { /* Use native C types to ensure same types in kernel and user space */
109 unsigned int type; /* DEVFSD_NOTIFY_* value */
110 unsigned int mode; /* Mode of the inode or device entry */
111 unsigned int major; /* Major number of device entry */
112 unsigned int minor; /* Minor number of device entry */
113 unsigned int uid; /* Uid of process, inode or device entry */
114 unsigned int gid; /* Gid of process, inode or device entry */
115 unsigned int overrun_count; /* Number of lost events */
116 unsigned int namelen; /* Number of characters not including '\0' */
117 /* The device name MUST come last */
118 char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */
121 #define BUFFER_SIZE 16384
122 #define DEVFSD_VERSION "1.3.25"
123 #define CONFIG_FILE "/etc/devfsd.conf"
124 #define MODPROBE "/sbin/modprobe"
125 #define MODPROBE_SWITCH_1 "-k"
126 #define MODPROBE_SWITCH_2 "-C"
127 #define CONFIG_MODULES_DEVFS "/etc/modules.devfs"
128 #define MAX_ARGS (6 + 1)
129 #define MAX_SUBEXPR 10
130 #define STRING_LENGTH 255
132 /* for get_uid_gid() */
136 /* fork_and_execute() */
140 /* for dir_operation() */
143 #define READ_CONFIG 2
145 /* Update only after changing code to reflect new protocol */
146 #define DEVFSD_PROTOCOL_REVISION_DAEMON 5
148 /* Compile-time check */
149 #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
150 #error protocol version mismatch. Update your kernel headers
153 #define AC_PERMISSIONS 0
156 #define AC_MFUNCTION 3 /* not supported by busybox */
157 #define AC_CFUNCTION 4 /* not supported by busybox */
160 #define AC_MKOLDCOMPAT 7
161 #define AC_MKNEWCOMPAT 8
162 #define AC_RMOLDCOMPAT 9
163 #define AC_RMNEWCOMPAT 10
164 #define AC_RESTORE 11
166 struct permissions_type
175 char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
181 const char *destination;
190 struct config_entry_struct
192 struct action_type action;
196 struct permissions_type permissions;
197 struct execute_type execute;
198 struct copy_type copy;
201 struct config_entry_struct *next;
204 struct get_variable_info
206 const struct devfsd_notify_struct *info;
208 char devpath[STRING_LENGTH];
211 static void dir_operation(int , const char * , int, unsigned long* );
212 static void service(struct stat statbuf, char *path);
213 static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *);
214 static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
215 static int mksymlink (const char *oldpath, const char *newpath);
216 static void read_config_file (char *path, int optional, unsigned long *event_mask);
217 static void process_config_line (const char *, unsigned long *);
218 static int do_servicing (int, unsigned long);
219 static void service_name (const struct devfsd_notify_struct *);
220 static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *);
221 static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *,
222 const regmatch_t *, unsigned);
223 static void action_modload (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
224 static void action_copy (const struct devfsd_notify_struct *, const struct config_entry_struct *,
225 const regmatch_t *, unsigned);
226 static void action_compat (const struct devfsd_notify_struct *, unsigned);
227 static void free_config (void);
228 static void restore(char *spath, struct stat source_stat, int rootlen);
229 static int copy_inode (const char *, const struct stat *, mode_t, const char *, const struct stat *);
230 static mode_t get_mode (const char *);
231 static void signal_handler (int);
232 static const char *get_variable (const char *, void *);
233 static int make_dir_tree (const char *);
234 static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
235 const char *, const regmatch_t *, unsigned );
236 static void expand_regexp (char *, size_t, const char *, const char *, const regmatch_t *, unsigned );
237 static const char *expand_variable( char *, unsigned, unsigned *, const char *,
238 const char *(*) (const char *, void *), void * );
239 static const char *get_variable_v2(const char *, const char *(*) (const char *, void *), void *);
240 static char get_old_ide_name (unsigned , unsigned);
241 static char *write_old_sd_name (char *, unsigned, unsigned, char *);
243 /* busybox functions */
244 static void msg_logger(int pri, const char * fmt, ... )__attribute__ ((format (printf, 2, 3)));
245 static void msg_logger_and_die(int pri, const char * fmt, ... )__attribute__ ((noreturn, format (printf, 2, 3)));
246 static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag);
247 static void fork_and_execute(int die, char *arg0, char **arg );
248 static int get_uid_gid ( int, const char *);
249 static void safe_memcpy( char * dest, const char * src, int len);
250 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr);
251 static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr);
253 /* Structs and vars */
254 static struct config_entry_struct *first_config = NULL;
255 static struct config_entry_struct *last_config = NULL;
256 static const char *mount_point = NULL;
257 static volatile int caught_signal = FALSE;
258 static volatile int caught_sighup = FALSE;
259 static struct initial_symlink_struct
263 } initial_symlinks[] =
265 {"/proc/self/fd", "fd"},
272 static struct event_type
274 unsigned int type; /* The DEVFSD_NOTIFY_* value */
275 const char *config_name; /* The name used in the config file */
278 {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
279 {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
280 {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
281 {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
282 {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
283 {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
284 {DEVFSD_NOTIFY_CREATE, "CREATE"},
285 {DEVFSD_NOTIFY_DELETE, "DELETE"},
289 /* Busybox messages */
291 static const char * const bb_msg_proto_rev = "protocol revision";
292 static const char * const bb_msg_bad_config = "bad %s config file: %s";
293 static const char * const bb_msg_small_buffer = "buffer too small";
294 static const char * const bb_msg_variable_not_found = "variable: %s not found";
296 /* Busybox functions */
297 static void msg_logger(int pri, const char * fmt, ... )
303 ret = access ("/dev/log", F_OK);
305 openlog(bb_applet_name, 0, LOG_DAEMON);
306 vsyslog( pri , fmt, ap);
307 /* Man: A trailing newline is added when needed. */
310 /* ENABLE_DEVFSD_VERBOSE is always enabled if msg_logger is used */
311 if ((ENABLE_DEVFSD_VERBOSE && ret) || ENABLE_DEBUG) {
312 bb_error_msg(fmt, ap);
317 static void msg_logger_and_die(int pri, const char* fmt, ...)
322 msg_logger(pri, fmt, ap);
328 #if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
329 #define devfsd_error_msg(fmt, args...) bb_error_msg(fmt, ## args)
330 #define devfsd_perror_msg_and_die(fmt, args...) bb_perror_msg_and_die(fmt, ## args)
331 #define devfsd_error_msg_and_die(fmt, args...) bb_error_msg_and_die(fmt, ## args)
332 #if defined(CONFIG_DEBUG)
333 #define debug_msg_logger(x, fmt, args...) msg_logger(x, fmt, ## args)
335 #define debug_msg_logger(x, fmt, args...)
338 #define debug_msg_logger(x, fmt, args...)
339 #define msg_logger(p, fmt, args...)
340 #define msg_logger_and_die(p, fmt, args...) exit(1)
341 #define devfsd_perror_msg_and_die(fmt, args...) exit(1)
342 #define devfsd_error_msg_and_die(fmt, args...) exit(1)
343 #define devfsd_error_msg(fmt, args...)
346 static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag)
348 if (ioctl (fd, request, event_mask_flag) == -1)
349 msg_logger_and_die(LOG_ERR, "ioctl");
352 static void fork_and_execute(int die, char *arg0, char **arg )
360 /* Parent: Error : die or return */
361 msg_logger(LOG_ERR,(char *) bb_msg_memory_exhausted);
366 /* Parent : ok : return or exit */
374 /* Child : if arg0 != NULL do execvp */
378 msg_logger_and_die(LOG_ERR, "execvp");
382 static void safe_memcpy( char *dest, const char *src, int len)
384 memcpy (dest , src , len );
388 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr)
390 if( d[n - 4]=='d' && d[n - 3]=='i' && d[n - 2]=='s' && d[n - 1]=='c')
391 return (2 + addendum);
392 else if( d[n - 2]=='c' && d[n - 1]=='d')
393 return (3 + addendum);
394 else if(ptr[0]=='p' && ptr[1]=='a' && ptr[2]=='r' && ptr[3]=='t')
395 return (4 + addendum);
396 else if( ptr[n - 2]=='m' && ptr[n - 1]=='t')
397 return (5 + addendum);
402 static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr)
404 if(d[0]=='s' && d[1]=='c' && d[2]=='s' && d[3]=='i' && d[4]=='/')
406 if( d[n - 7]=='g' && d[n - 6]=='e' && d[n - 5]=='n' &&
407 d[n - 4]=='e' && d[n - 3]=='r' && d[n - 2]=='i' &&
410 return scan_dev_name_common(d, n, 0, ptr);
412 else if(d[0]=='i' && d[1]=='d' && d[2]=='e' && d[3]=='/' &&
413 d[4]=='h' && d[5]=='o' && d[6]=='s' && d[7]=='t')
415 return scan_dev_name_common(d, n, 4, ptr);
417 else if(d[0]=='s' && d[1]=='b' && d[2]=='p' && d[3]=='/')
421 else if(d[0]=='v' && d[1]=='c' && d[2]=='c' && d[3]=='/')
425 else if(d[0]=='p' && d[1]=='t' && d[2]=='y' && d[3]=='/')
432 /* Public functions follow */
434 int devfsd_main (int argc, char **argv)
436 int print_version = FALSE;
437 int do_daemon = TRUE;
438 int no_polling = FALSE;
440 int fd, proto_rev, count;
441 unsigned long event_mask = 0;
442 struct sigaction new_action;
443 struct initial_symlink_struct *curr;
448 for (count = 2; count < argc; ++count)
450 if(argv[count][0] == '-')
452 if(argv[count][1]=='v' && !argv[count][2]) /* -v */
453 print_version = TRUE;
454 else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='f'
455 && argv[count][2]=='g' && !argv[count][3]) /* -fg */
457 else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='n'
458 && argv[count][2]=='p' && !argv[count][3]) /* -np */
465 /* strip last / from mount point, so we don't need to check for it later */
466 while( argv[1][1]!='\0' && argv[1][strlen(argv[1])-1] == '/' )
467 argv[1][strlen(argv[1]) -1] = '\0';
469 mount_point = argv[1];
471 if (chdir (mount_point) != 0)
472 devfsd_perror_msg_and_die(mount_point);
474 fd = bb_xopen (".devfsd", O_RDONLY);
476 if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0)
477 devfsd_perror_msg_and_die("FD_CLOEXEC");
479 if (ioctl (fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev) == -1)
480 msg_logger_and_die(LOG_ERR, "ioctl");
482 /*setup initial entries */
483 for (curr = initial_symlinks; curr->dest != NULL; ++curr)
484 symlink (curr->dest, curr->name);
486 /* NB: The check for CONFIG_FILE is done in read_config_file() */
488 if ( print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) )
490 bb_printf( "%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
491 bb_applet_name,DEVFSD_VERSION,bb_msg_proto_rev,
492 DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev);
493 if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
494 bb_error_msg_and_die( "%s mismatch!",bb_msg_proto_rev);
495 exit(EXIT_SUCCESS); /* -v */
497 /* Tell kernel we are special (i.e. we get to see hidden entries) */
498 do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
500 sigemptyset (&new_action.sa_mask);
501 new_action.sa_flags = 0;
503 /* Set up SIGHUP and SIGUSR1 handlers */
504 new_action.sa_handler = signal_handler;
505 if (sigaction (SIGHUP, &new_action, NULL) != 0 || sigaction (SIGUSR1, &new_action, NULL) != 0 )
506 devfsd_error_msg_and_die( "sigaction");
508 bb_printf("%s v%s started for %s\n",bb_applet_name, DEVFSD_VERSION, mount_point);
510 /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
512 read_config_file (CONFIG_FILE, FALSE, &event_mask);
513 /* Do the scan before forking, so that boot scripts see the finished product */
514 dir_operation(SERVICE,mount_point,0,NULL);
516 if (ENABLE_DEVFSD_FG_NP && no_polling)
520 /* Release so that the child can grab it */
521 do_ioctl_and_die(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
522 fork_and_execute(DIE, NULL, NULL);
523 setsid (); /* Prevent hangups and become pgrp leader */
524 } else if(ENABLE_DEVFSD_FG_NP) {
525 setpgid (0, 0); /* Become process group leader */
530 do_scan = do_servicing (fd, event_mask);
533 read_config_file (CONFIG_FILE, FALSE, &event_mask);
535 dir_operation(SERVICE,mount_point,0,NULL);
537 } /* End Function main */
540 /* Private functions follow */
542 static void read_config_file (char *path, int optional, unsigned long *event_mask)
543 /* [SUMMARY] Read a configuration database.
544 <path> The path to read the database from. If this is a directory, all
545 entries in that directory will be read (except hidden entries).
546 <optional> If TRUE, the routine will silently ignore a missing config file.
547 <event_mask> The event mask is written here. This is not initialised.
553 char buf[STRING_LENGTH];
556 debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, path);
558 if (stat (path, &statbuf) == 0 )
560 /* Don't read 0 length files: ignored */
561 /*if( statbuf.st_size == 0 )
563 if ( S_ISDIR (statbuf.st_mode) )
565 /* strip last / from dirname so we don't need to check for it later */
566 while( path && path[1]!='\0' && path[strlen(path)-1] == '/')
567 path[strlen(path) -1] = '\0';
569 dir_operation(READ_CONFIG, path, 0, event_mask);
572 if ( ( fp = fopen (path, "r") ) != NULL )
574 while (fgets (buf, STRING_LENGTH, fp) != NULL)
576 /* Skip whitespace */
577 for (line = buf; isspace (*line); ++line)
579 if (line[0] == '\0' || line[0] == '#' )
581 process_config_line (line, event_mask);
585 goto read_config_file_err;
588 read_config_file_err:
589 if(optional == 0 && errno == ENOENT)
590 msg_logger_and_die(LOG_ERR, "read config file: %s: %m", path);
593 } /* End Function read_config_file */
595 static void process_config_line (const char *line, unsigned long *event_mask)
596 /* [SUMMARY] Process a line from a configuration file.
597 <line> The configuration line.
598 <event_mask> The event mask is written here. This is not initialised.
603 struct config_entry_struct *new;
604 char p[MAX_ARGS][STRING_LENGTH];
605 char when[STRING_LENGTH], what[STRING_LENGTH];
606 char name[STRING_LENGTH];
611 /* !!!! Only Uppercase Keywords in devsfd.conf */
612 static const char *const options[] = {
613 "CLEAR_CONFIG", "INCLUDE", "OPTIONAL_INCLUDE",
614 "RESTORE", "PERMISSIONS", "MODLOAD", "EXECUTE",
615 "COPY", "IGNORE", "MKOLDCOMPAT", "MKNEWCOMPAT",
616 "RMOLDCOMPAT", "RMNEWCOMPAT", 0
619 debug_msg_logger(LOG_INFO, __FUNCTION__);
621 for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0';
622 num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s",
624 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
626 i = compare_string_array(options, when );
637 goto process_config_line_err;
639 /* "INCLUDE" & "OPTIONAL_INCLUDE" */
640 if( i == 1 || i == 2 )
642 st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL );
643 msg_logger(LOG_INFO, "%sinclude: %s",(toupper (when[0]) == 'I') ? "": "optional_", name);
644 read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask);
650 dir_operation(RESTORE,name, strlen (name),NULL);
654 goto process_config_line_err;
656 new = xmalloc (sizeof *new);
657 memset (new, 0, sizeof *new);
659 for (count = 0; event_types[count].config_name != NULL; ++count)
661 if (strcasecmp (when, event_types[count].config_name) != 0)
663 new->action.when = event_types[count].type;
666 if (event_types[count].config_name == NULL)
669 goto process_config_line_err;
672 i = compare_string_array(options, what );
676 case 4: /* "PERMISSIONS" */
677 new->action.what = AC_PERMISSIONS;
678 /* Get user and group */
679 if ( ( ptr = strchr (p[0], '.') ) == NULL )
682 goto process_config_line_err; /*"missing '.' in UID.GID"*/
686 new->u.permissions.uid = get_uid_gid (UID, p[0]);
687 new->u.permissions.gid = get_uid_gid (GID, ptr);
689 new->u.permissions.mode = get_mode (p[1]);
691 case 5: /* MODLOAD */
692 /*This action will pass "/dev/$devname" (i.e. "/dev/" prefixed to
693 the device name) to the module loading facility. In addition,
694 the /etc/modules.devfs configuration file is used.*/
695 if (ENABLE_DEVFSD_MODLOAD)
696 new->action.what = AC_MODLOAD;
698 case 6: /* EXECUTE */
699 new->action.what = AC_EXECUTE;
702 for (count = 0; count < num_args; ++count)
703 new->u.execute.argv[count] = bb_xstrdup (p[count]);
705 new->u.execute.argv[num_args] = NULL;
708 new->action.what = AC_COPY;
711 goto process_config_line_err; /* missing path and function in line */
713 new->u.copy.source = bb_xstrdup (p[0]);
714 new->u.copy.destination = bb_xstrdup (p[1]);
718 case 9: /* MKOLDCOMPAT */
720 case 10: /* MKNEWCOMPAT */
722 case 11:/* RMOLDCOMPAT */
724 case 12: /* RMNEWCOMPAT */
730 new->action.what = i - 2;
734 goto process_config_line_err;
738 xregcomp( &new->preg, name, REG_EXTENDED);
740 *event_mask |= 1 << new->action.when;
742 if (first_config == NULL)
745 last_config->next = new;
748 process_config_line_err:
749 msg_logger_and_die(LOG_ERR, bb_msg_bad_config, msg , line);
750 } /* End Function process_config_line */
752 static int do_servicing (int fd, unsigned long event_mask)
753 /* [SUMMARY] Service devfs changes until a signal is received.
754 <fd> The open control file.
755 <event_mask> The event mask.
756 [RETURNS] TRUE if SIGHUP was caught, else FALSE.
760 struct devfsd_notify_struct info;
761 unsigned long tmp_event_mask;
763 debug_msg_logger(LOG_INFO, __FUNCTION__);
765 /* Tell devfs what events we care about */
766 tmp_event_mask = event_mask;
767 do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
768 while (!caught_signal)
771 bytes = read (fd, (char *) &info, sizeof info);
773 break; /* Must test for this first */
775 continue; /* Yes, the order is important */
778 service_name (&info);
782 int c_sighup = caught_sighup;
784 caught_signal = FALSE;
785 caught_sighup = FALSE;
788 msg_logger_and_die(LOG_ERR, "read error on control file");
789 } /* End Function do_servicing */
791 static void service_name (const struct devfsd_notify_struct *info)
792 /* [SUMMARY] Service a single devfs change.
793 <info> The devfs change.
798 regmatch_t mbuf[MAX_SUBEXPR];
799 struct config_entry_struct *entry;
801 debug_msg_logger(LOG_INFO, __FUNCTION__);
802 if (ENABLE_DEBUG && info->overrun_count > 0)
803 debug_msg_logger(LOG_ERR, "lost %u events", info->overrun_count);
805 /* Discard lookups on "/dev/log" and "/dev/initctl" */
806 if( info->type == DEVFSD_NOTIFY_LOOKUP &&
807 ((info->devname[0]=='l' && info->devname[1]=='o' &&
808 info->devname[2]=='g' && !info->devname[3]) ||
809 ( info->devname[0]=='i' && info->devname[1]=='n' &&
810 info->devname[2]=='i' && info->devname[3]=='t' &&
811 info->devname[4]=='c' && info->devname[5]=='t' &&
812 info->devname[6]=='l' && !info->devname[7])))
814 for (entry = first_config; entry != NULL; entry = entry->next)
816 /* First check if action matches the type, then check if name matches */
817 if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 )
819 for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
822 debug_msg_logger(LOG_INFO, "%s: action.what %d", __FUNCTION__, entry->action.what);
824 switch (entry->action.what)
827 action_permissions (info, entry);
830 if(ENABLE_DEVFSD_MODLOAD)
831 action_modload (info, entry);
834 action_execute (info, entry, mbuf, n);
837 action_copy (info, entry, mbuf, n);
846 action_compat (info, entry->action.what);
849 msg_logger_and_die(LOG_ERR, "Unknown action");
852 } /* End Function service_name */
854 static void action_permissions (const struct devfsd_notify_struct *info,
855 const struct config_entry_struct *entry)
856 /* [SUMMARY] Update permissions for a device entry.
857 <info> The devfs change.
858 <entry> The config file entry.
864 debug_msg_logger(LOG_INFO, __FUNCTION__);
866 if ( stat (info->devname, &statbuf) != 0 ||
867 chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 ||
868 chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0)
870 msg_logger(LOG_ERR, "Can't chmod or chown: %s: %m",info->devname);
872 } /* End Function action_permissions */
874 static void action_modload (const struct devfsd_notify_struct *info,
875 const struct config_entry_struct *entry ATTRIBUTE_UNUSED)
876 /* [SUMMARY] Load a module.
877 <info> The devfs change.
878 <entry> The config file entry.
883 char device[STRING_LENGTH];
886 argv[1] = MODPROBE_SWITCH_1; /* "-k" */
887 argv[2] = MODPROBE_SWITCH_2; /* "-C" */
888 argv[3] = CONFIG_MODULES_DEVFS;
892 snprintf (device, sizeof (device), "/dev/%s", info->devname);
893 debug_msg_logger(LOG_INFO, "%s: %s %s %s %s %s",__FUNCTION__, argv[0],argv[1],argv[2],argv[3],argv[4]);
894 fork_and_execute(DIE, argv[0], argv);
895 } /* End Function action_modload */
897 static void action_execute (const struct devfsd_notify_struct *info,
898 const struct config_entry_struct *entry,
899 const regmatch_t *regexpr, unsigned int numexpr)
900 /* [SUMMARY] Execute a programme.
901 <info> The devfs change.
902 <entry> The config file entry.
903 <regexpr> The number of subexpression (start, end) offsets within the
905 <numexpr> The number of elements within <<regexpr>>.
910 struct get_variable_info gv_info;
911 char *argv[MAX_ARGS + 1];
912 char largv[MAX_ARGS + 1][STRING_LENGTH];
914 debug_msg_logger(LOG_INFO ,__FUNCTION__);
916 gv_info.devname = info->devname;
917 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
918 for (count = 0; entry->u.execute.argv[count] != NULL; ++count)
920 expand_expression (largv[count], STRING_LENGTH,
921 entry->u.execute.argv[count],
922 get_variable, &gv_info,
923 gv_info.devname, regexpr, numexpr );
924 argv[count] = largv[count];
927 fork_and_execute(NO_DIE, argv[0], argv);
928 } /* End Function action_execute */
931 static void action_copy (const struct devfsd_notify_struct *info,
932 const struct config_entry_struct *entry,
933 const regmatch_t *regexpr, unsigned int numexpr)
934 /* [SUMMARY] Copy permissions.
935 <info> The devfs change.
936 <entry> The config file entry.
937 <regexpr> This list of subexpression (start, end) offsets within the
939 <numexpr> The number of elements in <<regexpr>>.
944 struct get_variable_info gv_info;
945 struct stat source_stat, dest_stat;
946 char source[STRING_LENGTH], destination[STRING_LENGTH];
949 debug_msg_logger(LOG_INFO, __FUNCTION__);
951 dest_stat.st_mode = 0;
953 if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) )
956 gv_info.devname = info->devname;
958 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
959 expand_expression (source, STRING_LENGTH, entry->u.copy.source,
960 get_variable, &gv_info, gv_info.devname,
963 expand_expression (destination, STRING_LENGTH, entry->u.copy.destination,
964 get_variable, &gv_info, gv_info.devname,
967 if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0)
969 lstat (destination, &dest_stat);
970 new_mode = source_stat.st_mode & ~S_ISVTX;
971 if (info->type == DEVFSD_NOTIFY_CREATE)
973 else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) )
975 ret = copy_inode (destination, &dest_stat, new_mode, source, &source_stat);
976 if (ENABLE_DEBUG && ret && (errno != EEXIST))
977 debug_msg_logger(LOG_ERR, "copy_inode: %s to %s: %m", source, destination);
979 } /* End Function action_copy */
981 static void action_compat (const struct devfsd_notify_struct *info, unsigned int action)
982 /* [SUMMARY] Process a compatibility request.
983 <info> The devfs change.
984 <action> The action to take.
989 const char *compat_name = NULL;
990 const char *dest_name = info->devname;
992 char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
993 int mode, host, bus, target, lun;
996 /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
997 static const char *const fmt[] = {
999 "sg/c%db%dt%du%d", /* scsi/generic */
1000 "sd/c%db%dt%du%d", /* scsi/disc */
1001 "sr/c%db%dt%du%d", /* scsi/cd */
1002 "sd/c%db%dt%du%dp%d", /* scsi/part */
1003 "st/c%db%dt%du%dm%d%c", /* scsi/mt */
1004 "ide/hd/c%db%dt%du%d", /* ide/host/disc */
1005 "ide/cd/c%db%dt%du%d", /* ide/host/cd */
1006 "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
1007 "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
1011 /* First construct compatibility name */
1014 case AC_MKOLDCOMPAT:
1015 case AC_RMOLDCOMPAT:
1016 compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor);
1018 case AC_MKNEWCOMPAT:
1019 case AC_RMNEWCOMPAT:
1020 ptr = strrchr (info->devname, '/') + 1;
1021 i=scan_dev_name(info->devname, info->namelen, ptr);
1023 debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i);
1029 sscanf (info->devname +((i<6)?5:4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
1030 snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + ((i>5)?4:0));
1031 dest_name = dest_buf;
1032 compat_name = compat_buf;
1035 /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
1036 if( i == 1 || i == 2 || i == 3 || i == 6 || i ==7 )
1037 sprintf ( compat_buf, fmt[i], host, bus, target, lun);
1039 /* 4 == scsi/part 8 == ide/host/part */
1040 if( i == 4 || i == 8)
1041 sprintf ( compat_buf, fmt[i], host, bus, target, lun, atoi (ptr + 4) );
1046 rewind_ = info->devname[info->namelen - 1];
1050 if(ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
1051 mode = ptr[2] - 107; /* 1 or 2 */
1054 sprintf (compat_buf, fmt [i], host, bus, target, lun, mode, rewind_);
1057 /* 9 == ide/host/mt */
1059 snprintf (compat_buf, sizeof (compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
1061 } /* switch(action) */
1063 if(compat_name == NULL )
1066 debug_msg_logger( LOG_INFO, "%s: %s", __FUNCTION__, compat_name);
1068 /* Now decide what to do with it */
1071 case AC_MKOLDCOMPAT:
1072 case AC_MKNEWCOMPAT:
1073 mksymlink (dest_name, compat_name);
1075 case AC_RMOLDCOMPAT:
1076 case AC_RMNEWCOMPAT:
1077 ret = unlink (compat_name);
1078 if (ENABLE_DEBUG && ret)
1079 debug_msg_logger(LOG_ERR, "unlink: %s: %m", compat_name);
1082 } /* switch(action) */
1083 } /* End Function action_compat */
1085 static void restore(char *spath, struct stat source_stat, int rootlen)
1087 char dpath[STRING_LENGTH];
1088 struct stat dest_stat;
1090 debug_msg_logger(LOG_INFO, __FUNCTION__);
1092 dest_stat.st_mode = 0;
1093 snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen);
1094 lstat (dpath, &dest_stat);
1096 if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) )
1097 copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
1099 if ( S_ISDIR (source_stat.st_mode) )
1100 dir_operation(RESTORE, spath, rootlen,NULL);
1104 static int copy_inode (const char *destpath, const struct stat *dest_stat,
1106 const char *sourcepath, const struct stat *source_stat)
1107 /* [SUMMARY] Copy an inode.
1108 <destpath> The destination path. An existing inode may be deleted.
1109 <dest_stat> The destination stat(2) information.
1110 <new_mode> The desired new mode for the destination.
1111 <sourcepath> The source path.
1112 <source_stat> The source stat(2) information.
1113 [RETURNS] TRUE on success, else FALSE.
1116 int source_len, dest_len;
1117 char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
1119 struct sockaddr_un un_addr;
1120 char symlink_val[STRING_LENGTH];
1122 debug_msg_logger(LOG_INFO, __FUNCTION__);
1124 if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) )
1127 if ( S_ISLNK (source_stat->st_mode) )
1129 if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 ||
1130 ( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 )
1132 source_link[source_len] = '\0';
1133 dest_link[dest_len] = '\0';
1134 if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) )
1137 symlink (source_link, destpath);
1140 } /* Else not a symlink */
1141 chmod (destpath, new_mode & ~S_IFMT);
1142 chown (destpath, source_stat->st_uid, source_stat->st_gid);
1145 /* Different types: unlink and create */
1147 switch (source_stat->st_mode & S_IFMT)
1150 if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 )
1152 un_addr.sun_family = AF_UNIX;
1153 snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath);
1154 val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr);
1156 if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0)
1160 if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 )
1162 symlink_val[val] = '\0';
1163 if (symlink (symlink_val, destpath) == 0)
1167 if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 )
1170 if (chmod (destpath, new_mode & ~S_IFMT) != 0)
1176 if (mknod (destpath, new_mode, source_stat->st_rdev) != 0)
1180 if (mkdir (destpath, new_mode & ~S_IFMT) != 0)
1183 if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
1188 } /* End Function copy_inode */
1190 static void free_config ()
1191 /* [SUMMARY] Free the configuration information.
1195 struct config_entry_struct *c_entry;
1198 debug_msg_logger(LOG_INFO, __FUNCTION__);
1200 for (c_entry = first_config; c_entry != NULL; c_entry = next)
1204 next = c_entry->next;
1205 regfree (&c_entry->preg);
1206 if (c_entry->action.what == AC_EXECUTE)
1208 for (count = 0; count < MAX_ARGS; ++count)
1210 if (c_entry->u.execute.argv[count] == NULL)
1212 free (c_entry->u.execute.argv[count]);
1217 first_config = NULL;
1219 } /* End Function free_config */
1221 static int get_uid_gid (int flag, const char *string)
1222 /* [SUMMARY] Convert a string to a UID or GID value.
1223 <flag> "UID" or "GID".
1224 <string> The string.
1225 [RETURNS] The UID or GID value.
1228 struct passwd *pw_ent;
1229 struct group *grp_ent;
1232 if (ENABLE_DEVFSD_VERBOSE)
1235 debug_msg_logger(LOG_INFO, __FUNCTION__);
1237 if(ENABLE_DEBUG && flag != UID && flag != GID)
1238 msg_logger_and_die(LOG_ERR,"%s: flag != UID && flag != GID", __FUNCTION__);
1240 if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) )
1241 return atoi (string);
1243 if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL )
1244 return (pw_ent->pw_uid);
1246 if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL )
1247 return (grp_ent->gr_gid);
1248 else if(ENABLE_DEVFSD_VERBOSE)
1251 if(ENABLE_DEVFSD_VERBOSE)
1252 msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]);
1254 }/* End Function get_uid_gid */
1256 static mode_t get_mode (const char *string)
1257 /* [SUMMARY] Convert a string to a mode value.
1258 <string> The string.
1259 [RETURNS] The mode value.
1265 debug_msg_logger(LOG_INFO, __FUNCTION__);
1267 if ( isdigit (string[0]) )
1268 return strtoul (string, NULL, 8);
1269 if (strlen (string) != 9)
1270 msg_logger_and_die(LOG_ERR, "bad mode: %s", string);
1276 if(string[0]=='r'||string[0]=='w'||string[0]=='x')
1282 } /* End Function get_mode */
1284 static void signal_handler (int sig)
1286 debug_msg_logger(LOG_INFO, __FUNCTION__);
1288 caught_signal = TRUE;
1290 caught_sighup = TRUE;
1292 msg_logger(LOG_INFO, "Caught signal %d", sig);
1293 } /* End Function signal_handler */
1295 static const char *get_variable (const char *variable, void *info)
1297 struct get_variable_info *gv_info = info;
1298 static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH];
1299 const char *field_names[] = { "hostname", "mntpt", "devpath", "devname",
1300 "uid", "gid", "mode", hostname, mount_point,
1301 gv_info->devpath, gv_info->devname, 0 };
1304 debug_msg_logger(LOG_INFO, __FUNCTION__);
1306 if (gethostname (hostname, STRING_LENGTH - 1) != 0)
1307 msg_logger_and_die(LOG_ERR, "gethostname: %m");
1309 /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
1310 hostname[STRING_LENGTH - 1] = '\0';
1312 /* compare_string_array returns i>=0 */
1313 i=compare_string_array(field_names, variable);
1315 if ( i > 6 && (i > 1 && gv_info == NULL))
1317 if( i >= 0 || i <= 3)
1319 debug_msg_logger(LOG_INFO, "%s: i=%d %s", __FUNCTION__, i ,field_names[i+7]);
1320 return(field_names[i+7]);
1324 sprintf (sbuf, "%u", gv_info->info->uid);
1326 sprintf (sbuf, "%u", gv_info->info->gid);
1328 sprintf (sbuf, "%o", gv_info->info->mode);
1330 debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, sbuf);
1333 } /* End Function get_variable */
1335 static void service(struct stat statbuf, char *path)
1337 struct devfsd_notify_struct info;
1339 debug_msg_logger(LOG_INFO, __FUNCTION__);
1341 memset (&info, 0, sizeof info);
1342 info.type = DEVFSD_NOTIFY_REGISTERED;
1343 info.mode = statbuf.st_mode;
1344 info.major = major (statbuf.st_rdev);
1345 info.minor = minor (statbuf.st_rdev);
1346 info.uid = statbuf.st_uid;
1347 info.gid = statbuf.st_gid;
1348 snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1);
1349 info.namelen = strlen (info.devname);
1350 service_name (&info);
1351 if ( S_ISDIR (statbuf.st_mode) )
1352 dir_operation(SERVICE,path,0,NULL);
1355 static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
1356 /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
1357 <flag> To choose which function to perform
1358 <dp> The directory pointer. This is closed upon completion.
1359 <dir_name> The name of the directory.
1360 <rootlen> string length parameter.
1364 struct stat statbuf;
1367 char path[STRING_LENGTH];
1369 debug_msg_logger(LOG_INFO, __FUNCTION__);
1371 if((dp = opendir( dir_name))==NULL)
1373 debug_msg_logger(LOG_ERR, "opendir: %s: %m", dir_name);
1377 while ( (de = readdir (dp) ) != NULL )
1380 if(de->d_name && *de->d_name == '.' && (!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2])))
1382 snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name);
1383 debug_msg_logger(LOG_ERR, "%s: %s", __FUNCTION__, path);
1385 if (lstat (path, &statbuf) != 0)
1387 debug_msg_logger(LOG_ERR, "%s: %s: %m", __FUNCTION__, path);
1393 service(statbuf,path);
1396 restore(path, statbuf, var);
1399 read_config_file (path, var, event_mask);
1404 } /* End Function do_scan_and_service */
1406 static int mksymlink (const char *oldpath, const char *newpath)
1407 /* [SUMMARY] Create a symlink, creating intervening directories as required.
1408 <oldpath> The string contained in the symlink.
1409 <newpath> The name of the new symlink.
1410 [RETURNS] 0 on success, else -1.
1413 debug_msg_logger(LOG_INFO, __FUNCTION__);
1415 if ( !make_dir_tree (newpath) )
1418 if (symlink (oldpath, newpath) != 0)
1420 if (errno != EEXIST)
1422 debug_msg_logger(LOG_ERR, "%s: %s to %s: %m", __FUNCTION__, oldpath, newpath);
1427 } /* End Function mksymlink */
1430 static int make_dir_tree (const char *path)
1431 /* [SUMMARY] Creating intervening directories for a path as required.
1432 <path> The full pathname (including the leaf node).
1433 [RETURNS] TRUE on success, else FALSE.
1436 debug_msg_logger(LOG_INFO, __FUNCTION__);
1438 if (bb_make_directory( dirname((char *)path), -1, FILEUTILS_RECUR )==-1)
1440 debug_msg_logger(LOG_ERR, "%s: %s: %m",__FUNCTION__, path);
1444 } /* End Function make_dir_tree */
1446 static int expand_expression(char *output, unsigned int outsize,
1448 const char *(*get_variable_func)(const char *variable, void *info),
1450 const char *devname,
1451 const regmatch_t *ex, unsigned int numexp)
1452 /* [SUMMARY] Expand environment variables and regular subexpressions in string.
1453 <output> The output expanded expression is written here.
1454 <length> The size of the output buffer.
1455 <input> The input expression. This may equal <<output>>.
1456 <get_variable> A function which will be used to get variable values. If
1457 this returns NULL, the environment is searched instead. If this is NULL,
1458 only the environment is searched.
1459 <info> An arbitrary pointer passed to <<get_variable>>.
1460 <devname> Device name; specifically, this is the string that contains all
1461 of the regular subexpressions.
1462 <ex> Array of start / end offsets into info->devname for each subexpression
1463 <numexp> Number of regular subexpressions found in <<devname>>.
1464 [RETURNS] TRUE on success, else FALSE.
1467 char temp[STRING_LENGTH];
1469 debug_msg_logger(LOG_INFO, __FUNCTION__);
1471 if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) )
1473 expand_regexp (output, outsize, temp, devname, ex, numexp);
1475 } /* End Function expand_expression */
1477 static void expand_regexp (char *output, size_t outsize, const char *input,
1478 const char *devname,
1479 const regmatch_t *ex, unsigned int numex )
1480 /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
1481 <output> The output expanded expression is written here.
1482 <outsize> The size of the output buffer.
1483 <input> The input expression. This may NOT equal <<output>>, because
1484 supporting that would require yet another string-copy. However, it's not
1485 hard to write a simple wrapper function to add this functionality for those
1486 few cases that need it.
1487 <devname> Device name; specifically, this is the string that contains all
1488 of the regular subexpressions.
1489 <ex> An array of start and end offsets into <<devname>>, one for each
1491 <numex> Number of subexpressions in the offset-array <<ex>>.
1495 const char last_exp = '0' - 1 + numex;
1498 debug_msg_logger(LOG_INFO, __FUNCTION__);
1500 /* Guarantee NULL termination by writing an explicit '\0' character into
1501 the very last byte */
1503 output[--outsize] = '\0';
1504 /* Copy the input string into the output buffer, replacing '\\' with '\'
1505 and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
1506 codes are deleted */
1507 while ( (c != '\0') && (outsize != 0) )
1517 if ((c >= '0') && (c <= last_exp))
1519 const regmatch_t *subexp = ex + (c - '0');
1520 unsigned int sublen = subexp->rm_eo - subexp->rm_so;
1522 /* Range checking */
1523 if (sublen > outsize)
1525 strncpy (output, devname + subexp->rm_so, sublen);
1536 } /* End Function expand_regexp */
1539 /* from compat_name.c */
1541 struct translate_struct
1543 char *match; /* The string to match to (up to length) */
1544 char *format; /* Format of output, "%s" takes data past match string,
1545 NULL is effectively "%s" (just more efficient) */
1548 static struct translate_struct translate_table[] =
1551 {"printers/", "lp%s"},
1553 {"parports/", "parport%s"},
1556 {"loop/", "loop%s"},
1557 {"floppy/", "fd%s"},
1559 {"md/", "md%s"}, /* Meta-devices */
1563 {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
1565 {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
1566 {"tts/E", "ttyE%s"}, /* Stallion serial driver */
1567 {"cua/E", "cue%s"}, /* Stallion serial driver callout */
1568 {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
1569 {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
1570 {"ip2/", "ip2%s"}, /* Computone serial driver control */
1571 {"tts/F", "ttyF%s"}, /* Computone serial driver */
1572 {"cua/F", "cuf%s"}, /* Computone serial driver callout */
1573 {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
1574 {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
1575 {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
1576 {"cua/", "cua%s"}, /* Generic serial: must be after others */
1577 {"input/js", "js%s"}, /* Joystick driver */
1581 const char *get_old_name (const char *devname, unsigned int namelen,
1582 char *buffer, unsigned int major, unsigned int minor)
1583 /* [SUMMARY] Translate a kernel-supplied name into an old name.
1584 <devname> The device name provided by the kernel.
1585 <namelen> The length of the name.
1586 <buffer> A buffer that may be used. This should be at least 128 bytes long.
1587 <major> The major number for the device.
1588 <minor> The minor number for the device.
1589 [RETURNS] A pointer to the old name if known, else NULL.
1592 const char *compat_name = NULL;
1594 struct translate_struct *trans;
1601 /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
1602 static const char *const fmt[] = {
1604 "sg%u", /* scsi/generic */
1605 NULL, /* scsi/disc */
1606 "sr%u", /* scsi/cd */
1607 NULL, /* scsi/part */
1608 "nst%u%c", /* scsi/mt */
1609 "hd%c" , /* ide/host/disc */
1610 "hd%c" , /* ide/host/cd */
1611 "hd%c%s", /* ide/host/part */
1612 "%sht%d", /* ide/host/mt */
1613 "sbpcd%u", /* sbp/ */
1615 "%cty%c%c", /* pty/ */
1619 debug_msg_logger(LOG_INFO, __FUNCTION__);
1621 for (trans = translate_table; trans->match != NULL; ++trans)
1623 len = strlen (trans->match);
1625 if (strncmp (devname, trans->match, len) == 0)
1627 if (trans->format == NULL)
1628 return (devname + len);
1629 sprintf (buffer, trans->format, devname + len);
1634 ptr = (strrchr (devname, '/') + 1);
1635 i = scan_dev_name(devname, namelen, ptr);
1637 if( i > 0 && i < 13)
1638 compat_name = buffer;
1642 debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i);
1644 /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
1645 if( i == 1 || i == 3 || i == 10 )
1646 sprintf (buffer, fmt[i], minor);
1648 /* 2 ==scsi/disc, 4 == scsi/part */
1649 if( i == 2 || i == 4)
1650 compat_name = write_old_sd_name (buffer, major, minor,((i == 2)?"":(ptr + 4)));
1658 sprintf (buffer, fmt[i], minor & 0x1f, mode);
1659 if (devname[namelen - 1] != 'n')
1662 /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
1663 if( i == 6 || i == 7 || i == 8 )
1664 /* last arg should be ignored for i == 6 or i== 7 */
1665 sprintf (buffer, fmt[i] , get_old_ide_name (major, minor), ptr + 4);
1667 /* 9 == ide/host/mt */
1669 sprintf (buffer, fmt[i], ptr + 2, minor & 0x7f);
1674 sprintf (buffer, fmt[i], devname + 4);
1675 if (buffer[3] == '0')
1681 pty1 = "pqrstuvwxyzabcde";
1682 pty2 = "0123456789abcdef";
1683 indexx = atoi (devname + 5);
1684 sprintf (buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
1687 if(ENABLE_DEBUG && compat_name!=NULL)
1688 msg_logger(LOG_INFO, "%s: compat_name %s", __FUNCTION__, compat_name);
1690 return (compat_name);
1691 } /* End Function get_old_name */
1693 static char get_old_ide_name (unsigned int major, unsigned int minor)
1694 /* [SUMMARY] Get the old IDE name for a device.
1695 <major> The major number for the device.
1696 <minor> The minor number for the device.
1697 [RETURNS] The drive letter.
1700 char letter='y'; /* 121 */
1701 char c='a'; /* 97 */
1704 debug_msg_logger(LOG_INFO, __FUNCTION__);
1706 /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
1708 if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR ||
1709 i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR ||
1710 i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR ||
1713 if((unsigned int)i==major)
1721 } while(i<=IDE9_MAJOR);
1726 } /* End Function get_old_ide_name */
1728 static char *write_old_sd_name (char *buffer,
1729 unsigned int major, unsigned int minor,
1731 /* [SUMMARY] Write the old SCSI disc name to a buffer.
1732 <buffer> The buffer to write to.
1733 <major> The major number for the device.
1734 <minor> The minor number for the device.
1735 <part> The partition string. Must be "" for a whole-disc entry.
1736 [RETURNS] A pointer to the buffer on success, else NULL.
1739 unsigned int disc_index;
1741 debug_msg_logger(LOG_INFO, __FUNCTION__);
1745 sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part);
1748 if ( (major > 64) && (major < 72) )
1750 disc_index = ( (major - 64) << 4 ) + (minor >> 4);
1751 if (disc_index < 26)
1752 sprintf (buffer, "sd%c%s", 'a' + disc_index, part);
1754 sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part);
1758 } /* End Function write_old_sd_name */
1763 /*EXPERIMENTAL_FUNCTION*/
1765 int st_expr_expand (char *output, unsigned int length, const char *input,
1766 const char *(*get_variable_func) (const char *variable,
1769 /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
1770 <output> The output expanded expression is written here.
1771 <length> The size of the output buffer.
1772 <input> The input expression. This may equal <<output>>.
1773 <get_variable> A function which will be used to get variable values. If
1774 this returns NULL, the environment is searched instead. If this is NULL,
1775 only the environment is searched.
1776 <info> An arbitrary pointer passed to <<get_variable>>.
1777 [RETURNS] TRUE on success, else FALSE.
1782 unsigned int out_pos = 0;
1785 struct passwd *pwent;
1786 char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
1788 debug_msg_logger(LOG_INFO, __FUNCTION__);
1790 if (length > BUFFER_SIZE)
1791 length = BUFFER_SIZE;
1792 for (; TRUE; ++input)
1794 switch (ch = *input)
1797 /* Variable expansion */
1798 input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info);
1803 /* Home directory expansion */
1805 if ( isspace (ch) || (ch == '/') || (ch == '\0') )
1807 /* User's own home directory: leave separator for next time */
1808 if ( ( env = getenv ("HOME") ) == NULL )
1810 msg_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
1814 if (len + out_pos >= length)
1815 goto st_expr_expand_out;
1816 memcpy (buffer + out_pos, env, len + 1);
1820 /* Someone else's home directory */
1821 for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
1824 if (len >= sizeof tmp)
1825 goto st_expr_expand_out;
1826 safe_memcpy (tmp, input, len);
1828 if ( ( pwent = getpwnam (tmp) ) == NULL )
1830 msg_logger(LOG_INFO, "no pwent for: %s", tmp);
1833 len = strlen (pwent->pw_dir);
1834 if (len + out_pos >= length)
1835 goto st_expr_expand_out;
1836 memcpy (buffer + out_pos, pwent->pw_dir, len + 1);
1842 if (out_pos >= length)
1843 goto st_expr_expand_out;
1844 buffer[out_pos++] = ch;
1847 memcpy (output, buffer, out_pos);
1856 msg_logger(LOG_INFO, bb_msg_small_buffer);
1858 } /* End Function st_expr_expand */
1861 /* Private functions follow */
1863 static const char *expand_variable (char *buffer, unsigned int length,
1864 unsigned int *out_pos, const char *input,
1865 const char *(*func) (const char *variable,
1868 /* [SUMMARY] Expand a variable.
1869 <buffer> The buffer to write to.
1870 <length> The length of the output buffer.
1871 <out_pos> The current output position. This is updated.
1872 <input> A pointer to the input character pointer.
1873 <func> A function which will be used to get variable values. If this
1874 returns NULL, the environment is searched instead. If this is NULL, only
1875 the environment is searched.
1876 <info> An arbitrary pointer passed to <<func>>.
1877 <errfp> Diagnostic messages are written here.
1878 [RETURNS] A pointer to the end of this subexpression on success, else NULL.
1883 unsigned int open_braces;
1884 const char *env, *ptr;
1885 char tmp[STRING_LENGTH];
1887 debug_msg_logger(LOG_INFO, __FUNCTION__);
1892 /* Special case for "$$": PID */
1893 sprintf ( tmp, "%d", (int) getpid () );
1895 if (len + *out_pos >= length)
1896 goto expand_variable_out;
1898 memcpy (buffer + *out_pos, tmp, len + 1);
1902 /* Ordinary variable expansion, possibly in braces */
1905 /* Simple variable expansion */
1906 for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr)
1909 if ((size_t)len >= sizeof tmp)
1910 goto expand_variable_out;
1912 safe_memcpy (tmp, input, len);
1914 if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL )
1916 msg_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
1920 if (len + *out_pos >= length)
1921 goto expand_variable_out;
1923 memcpy (buffer + *out_pos, env, len + 1);
1927 /* Variable in braces: check for ':' tricks */
1929 for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr)
1933 /* Must be simple variable expansion with "${var}" */
1935 if ((size_t)len >= sizeof tmp)
1936 goto expand_variable_out;
1938 safe_memcpy (tmp, input, len);
1939 ptr = expand_variable (buffer, length, out_pos, tmp, func, info );
1942 return (input + len);
1944 if (ch != ':' || ptr[1] != '-' )
1946 msg_logger(LOG_INFO, "illegal char in var name");
1949 /* It's that handy "${var:-word}" expression. Check if var is defined */
1951 if ((size_t)len >= sizeof tmp)
1952 goto expand_variable_out;
1954 safe_memcpy (tmp, input, len);
1955 /* Move input pointer to ':' */
1957 /* First skip to closing brace, taking note of nested expressions */
1960 for (open_braces = 1; open_braces > 0; ch = *++ptr)
1971 msg_logger(LOG_INFO,"\"}\" not found in: %s", input);
1978 /* At this point ptr should point to closing brace of "${var:-word}" */
1979 if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL )
1981 /* Found environment variable, so skip the input to the closing brace
1982 and return the variable */
1985 if (len + *out_pos >= length)
1986 goto expand_variable_out;
1988 memcpy (buffer + *out_pos, env, len + 1);
1992 /* Environment variable was not found, so process word. Advance input
1993 pointer to start of word in "${var:-word}" */
1996 if ((size_t)len >= sizeof tmp)
1997 goto expand_variable_out;
1999 safe_memcpy (tmp, input, len);
2001 if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) )
2004 if (len + *out_pos >= length)
2005 goto expand_variable_out;
2007 memcpy (buffer + *out_pos, tmp, len + 1);
2010 expand_variable_out:
2011 msg_logger(LOG_INFO, bb_msg_small_buffer);
2013 } /* End Function expand_variable */
2016 static const char *get_variable_v2 (const char *variable,
2017 const char *(*func) (const char *variable, void *info),
2019 /* [SUMMARY] Get a variable from the environment or .
2020 <variable> The variable name.
2021 <func> A function which will be used to get the variable. If this returns
2022 NULL, the environment is searched instead. If this is NULL, only the
2023 environment is searched.
2024 [RETURNS] The value of the variable on success, else NULL.
2029 debug_msg_logger(LOG_INFO, __FUNCTION__);
2033 value = (*func) (variable, info);
2037 return getenv (variable);
2038 } /* End Function get_variable */