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 /* for msg_logger(), do_ioctl(),
137 fork_and_execute() */
141 /* for dir_operation() */
144 #define READ_CONFIG 2
146 /* Update only after changing code to reflect new protocol */
147 #define DEVFSD_PROTOCOL_REVISION_DAEMON 5
149 /* Compile-time check */
150 #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
151 #error protocol version mismatch. Update your kernel headers
154 #define AC_PERMISSIONS 0
157 #define AC_MFUNCTION 3 /* not supported by busybox */
158 #define AC_CFUNCTION 4 /* not supported by busybox */
161 #define AC_MKOLDCOMPAT 7
162 #define AC_MKNEWCOMPAT 8
163 #define AC_RMOLDCOMPAT 9
164 #define AC_RMNEWCOMPAT 10
165 #define AC_RESTORE 11
168 struct permissions_type
177 char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
183 const char *destination;
192 struct config_entry_struct
194 struct action_type action;
198 struct permissions_type permissions;
199 struct execute_type execute;
200 struct copy_type copy;
203 struct config_entry_struct *next;
206 struct get_variable_info
208 const struct devfsd_notify_struct *info;
210 char devpath[STRING_LENGTH];
213 static void dir_operation(int , const char * , int, unsigned long* );
214 static void service(struct stat statbuf, char *path);
215 static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *);
216 static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
217 static int mksymlink (const char *oldpath, const char *newpath);
218 static void read_config_file (char *path, int optional, unsigned long *event_mask);
219 static void process_config_line (const char *, unsigned long *);
220 static int do_servicing (int, unsigned long);
221 static void service_name (const struct devfsd_notify_struct *);
222 static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *);
223 static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *,
224 const regmatch_t *, unsigned);
225 #ifdef CONFIG_DEVFSD_MODLOAD
226 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, char *);
247 /* busybox functions */
248 #if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
249 static void msg_logger(int die, int pri, const char * fmt, ... );
251 static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag);
252 static void fork_and_execute(int die, char *arg0, char **arg );
253 static int get_uid_gid ( int, const char *);
254 static void safe_memcpy( char * dest, const char * src, int len);
255 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr);
256 static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr);
258 /* Structs and vars */
259 static struct config_entry_struct *first_config = NULL;
260 static struct config_entry_struct *last_config = NULL;
261 static const char *mount_point = NULL;
262 static volatile int caught_signal = FALSE;
263 static volatile int caught_sighup = FALSE;
264 static struct initial_symlink_struct
268 } initial_symlinks[] =
270 {"/proc/self/fd", "fd"},
277 static struct event_type
279 unsigned int type; /* The DEVFSD_NOTIFY_* value */
280 const char *config_name; /* The name used in the config file */
283 {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
284 {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
285 {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
286 {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
287 {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
288 {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
289 {DEVFSD_NOTIFY_CREATE, "CREATE"},
290 {DEVFSD_NOTIFY_DELETE, "DELETE"},
294 /* busybox functions and messages */
296 const char * const bb_msg_proto_rev = "protocol revision";
297 #ifdef CONFIG_DEVFSD_VERBOSE
298 const char * const bb_msg_bad_config = "bad %s config file: %s\n";
299 const char * const bb_msg_small_buffer = "buffer too small\n";
300 const char * const bb_msg_variable_not_found = "variable: %s not found\n";
303 #if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
304 static void msg_logger(int die, int pri, const char * fmt, ... )
309 if (access ("/dev/log", F_OK) == 0)
311 openlog(bb_applet_name, 0, LOG_DAEMON);
312 vsyslog( pri , fmt , ap);
318 bb_verror_msg(fmt, ap);
325 static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag)
327 #ifdef CONFIG_DEVFSD_VERBOSE
328 if (ioctl (fd, request, event_mask_flag) == -1)
329 msg_logger(die, LOG_ERR, "ioctl(): %m\n");
331 if (ioctl (fd, request, event_mask_flag) == -1)
336 static void fork_and_execute(int die, char *arg0, char **arg )
344 /* Parent: Error : die or return */
345 #ifdef CONFIG_DEVFSD_VERBOSE
346 msg_logger(die, LOG_ERR,(char *) bb_msg_memory_exhausted);
353 /* Parent : ok : return or exit */
361 /* Child : if arg0 != NULL do execvp */
365 #ifdef CONFIG_DEVFSD_VERBOSE
366 msg_logger(DIE, LOG_ERR, "execvp(): %s: %m\n", arg0);
373 static void safe_memcpy( char *dest, const char *src, int len)
375 memcpy (dest , src , len );
379 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr)
381 if( d[n - 4]=='d' && d[n - 3]=='i' && d[n - 2]=='s' && d[n - 1]=='c')
382 return (2 + addendum);
383 else if( d[n - 2]=='c' && d[n - 1]=='d')
384 return (3 + addendum);
385 else if(ptr[0]=='p' && ptr[1]=='a' && ptr[2]=='r' && ptr[3]=='t')
386 return (4 + addendum);
387 else if( ptr[n - 2]=='m' && ptr[n - 1]=='t')
388 return (5 + addendum);
393 static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr)
395 if(d[0]=='s' && d[1]=='c' && d[2]=='s' && d[3]=='i' && d[4]=='/')
397 if( d[n - 7]=='g' && d[n - 6]=='e' && d[n - 5]=='n' &&
398 d[n - 4]=='e' && d[n - 3]=='r' && d[n - 2]=='i' &&
401 return scan_dev_name_common(d, n, 0, ptr);
403 else if(d[0]=='i' && d[1]=='d' && d[2]=='e' && d[3]=='/' &&
404 d[4]=='h' && d[5]=='o' && d[6]=='s' && d[7]=='t')
406 return scan_dev_name_common(d, n, 4, ptr);
408 else if(d[0]=='s' && d[1]=='b' && d[2]=='p' && d[3]=='/')
412 else if(d[0]=='v' && d[1]=='c' && d[2]=='c' && d[3]=='/')
416 else if(d[0]=='p' && d[1]=='t' && d[2]=='y' && d[3]=='/')
423 /* Public functions follow */
425 int devfsd_main (int argc, char **argv)
427 int print_version = FALSE;
428 #ifdef CONFIG_DEVFSD_FG_NP
429 int do_daemon = TRUE;
430 int no_polling = FALSE;
433 int fd, proto_rev, count;
434 unsigned long event_mask = 0;
435 struct sigaction new_action;
436 struct initial_symlink_struct *curr;
441 for (count = 2; count < argc; ++count)
443 if(argv[count][0] == '-')
445 if(argv[count][1]=='v' && !argv[count][2]) /* -v */
446 print_version = TRUE;
447 #ifdef CONFIG_DEVFSD_FG_NP
448 else if(argv[count][1]=='f' && argv[count][2]=='g' && !argv[count][3]) /* -fg */
450 else if(argv[count][1]=='n' && argv[count][2]=='p' && !argv[count][3]) /* -np */
458 /* strip last / from mount point, so we don't need to check for it later */
459 while( argv[1][1]!='\0' && argv[1][strlen(argv[1])-1] == '/' )
460 argv[1][strlen(argv[1]) -1] = '\0';
462 mount_point = argv[1];
464 if (chdir (mount_point) != 0)
465 #ifdef CONFIG_DEVFSD_VERBOSE
466 bb_error_msg_and_die( " %s: %m", mount_point);
471 fd = bb_xopen (".devfsd", O_RDONLY);
473 if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0)
474 #ifdef CONFIG_DEVFSD_VERBOSE
475 bb_error_msg( "FD_CLOEXEC");
480 do_ioctl(DIE, fd, DEVFSDIOC_GET_PROTO_REV,(int )&proto_rev);
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(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 #ifdef CONFIG_DEVFSD_VERBOSE
507 bb_error_msg_and_die( "sigaction()");
512 bb_printf("%s v%s started for %s\n",bb_applet_name, DEVFSD_VERSION, mount_point);
514 /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
516 read_config_file (CONFIG_FILE, FALSE, &event_mask);
517 /* Do the scan before forking, so that boot scripts see the finished product */
518 dir_operation(SERVICE,mount_point,0,NULL);
519 #ifdef CONFIG_DEVFSD_FG_NP
525 /* Release so that the child can grab it */
526 do_ioctl(DIE, fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
527 fork_and_execute(DIE, NULL, NULL);
528 setsid (); /* Prevent hangups and become pgrp leader */
529 #ifdef CONFIG_DEVFSD_FG_NP
532 setpgid (0, 0); /* Become process group leader */
537 do_scan = do_servicing (fd, event_mask);
540 read_config_file (CONFIG_FILE, FALSE, &event_mask);
542 dir_operation(SERVICE,mount_point,0,NULL);
544 } /* End Function main */
547 /* Private functions follow */
549 static void read_config_file (char *path, int optional, unsigned long *event_mask)
550 /* [SUMMARY] Read a configuration database.
551 <path> The path to read the database from. If this is a directory, all
552 entries in that directory will be read (except hidden entries).
553 <optional> If TRUE, the routine will silently ignore a missing config file.
554 <event_mask> The event mask is written here. This is not initialised.
560 char buf[STRING_LENGTH];
564 msg_logger( NO_DIE, LOG_INFO, "read_config_file(): %s\n", path);
566 if (stat (path, &statbuf) == 0 )
568 /* Don't read 0 length files: ignored */
569 /*if( statbuf.st_size == 0 )
571 if ( S_ISDIR (statbuf.st_mode) )
573 /* strip last / from dirname so we don't need to check for it later */
574 while( path && path[1]!='\0' && path[strlen(path)-1] == '/')
575 path[strlen(path) -1] = '\0';
577 dir_operation(READ_CONFIG, path, 0, event_mask);
580 if ( ( fp = fopen (path, "r") ) != NULL )
582 while (fgets (buf, STRING_LENGTH, fp) != NULL)
584 /* Skip whitespace */
585 for (line = buf; isspace (*line); ++line)
587 if (line[0] == '\0' || line[0] == '#' )
589 process_config_line (line, event_mask);
593 goto read_config_file_err;
596 read_config_file_err:
597 #ifdef CONFIG_DEVFSD_VERBOSE
598 msg_logger(((optional == 0 ) && (errno == ENOENT))? DIE : NO_DIE, LOG_ERR, "read config file: %s: %m\n", path);
600 if(optional == 0 && errno == ENOENT)
605 } /* End Function read_config_file */
607 static void process_config_line (const char *line, unsigned long *event_mask)
608 /* [SUMMARY] Process a line from a configuration file.
609 <line> The configuration line.
610 <event_mask> The event mask is written here. This is not initialised.
615 struct config_entry_struct *new;
616 char p[MAX_ARGS][STRING_LENGTH];
617 char when[STRING_LENGTH], what[STRING_LENGTH];
618 char name[STRING_LENGTH];
622 /* !!!! Only Uppercase Keywords in devsfd.conf */
623 const char *options[] = { "CLEAR_CONFIG", "INCLUDE", "OPTIONAL_INCLUDE", "RESTORE",
624 "PERMISSIONS", "MODLOAD", "EXECUTE", "COPY", "IGNORE",
625 "MKOLDCOMPAT", "MKNEWCOMPAT","RMOLDCOMPAT", "RMNEWCOMPAT", 0 };
630 msg_logger( NO_DIE, LOG_INFO, "process_config_line()\n");
633 for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0';
634 num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s",
636 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
638 i = compare_string_array(options, when );
649 goto process_config_line_err;
651 /* "INCLUDE" & "OPTIONAL_INCLUDE" */
652 if( i == 1 || i == 2 )
654 st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL );
656 msg_logger( NO_DIE, LOG_INFO, "%sinclude: %s\n",(toupper (when[0]) == 'I') ? "": "optional_", name);
658 read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask);
664 dir_operation(RESTORE,name, strlen (name),NULL);
668 goto process_config_line_err;
670 new = xmalloc (sizeof *new);
671 memset (new, 0, sizeof *new);
673 for (count = 0; event_types[count].config_name != NULL; ++count)
675 if (strcasecmp (when, event_types[count].config_name) != 0)
677 new->action.when = event_types[count].type;
680 if (event_types[count].config_name == NULL)
683 goto process_config_line_err;
686 i = compare_string_array(options, what );
690 case 4: /* "PERMISSIONS" */
691 new->action.what = AC_PERMISSIONS;
692 /* Get user and group */
693 if ( ( ptr = strchr (p[0], '.') ) == NULL )
696 goto process_config_line_err; /*"missing '.' in UID.GID */
700 new->u.permissions.uid = get_uid_gid (UID, p[0]);
701 new->u.permissions.gid = get_uid_gid (GID, ptr);
703 new->u.permissions.mode = get_mode (p[1]);
705 #ifdef CONFIG_DEVFSD_MODLOAD
706 case 5: /* MODLOAD */
707 /*This action will pass "/dev/$devname" (i.e. "/dev/" prefixed to
708 the device name) to the module loading facility. In addition,
709 the /etc/modules.devfs configuration file is used.*/
710 new->action.what = AC_MODLOAD;
713 case 6: /* EXECUTE */
714 new->action.what = AC_EXECUTE;
717 for (count = 0; count < num_args; ++count)
718 new->u.execute.argv[count] = bb_xstrdup (p[count]);
720 new->u.execute.argv[num_args] = NULL;
723 new->action.what = AC_COPY;
726 goto process_config_line_err; /* missing path and function in line */
728 new->u.copy.source = bb_xstrdup (p[0]);
729 new->u.copy.destination = bb_xstrdup (p[1]);
733 case 9: /* MKOLDCOMPAT */
735 case 10: /* MKNEWCOMPAT */
737 case 11:/* RMOLDCOMPAT */
739 case 12: /* RMNEWCOMPAT */
745 new->action.what = i - 2;
749 goto process_config_line_err;
753 xregcomp( &new->preg, name, REG_EXTENDED);
755 *event_mask |= 1 << new->action.when;
757 if (first_config == NULL)
760 last_config->next = new;
763 process_config_line_err:
764 #ifdef CONFIG_DEVFSD_VERBOSE
765 msg_logger( DIE, LOG_ERR, bb_msg_bad_config, msg , line);
769 } /* End Function process_config_line */
771 static int do_servicing (int fd, unsigned long event_mask)
772 /* [SUMMARY] Service devfs changes until a signal is received.
773 <fd> The open control file.
774 <event_mask> The event mask.
775 [RETURNS] TRUE if SIGHUP was caught, else FALSE.
779 struct devfsd_notify_struct info;
780 unsigned long tmp_event_mask;
783 msg_logger( NO_DIE, LOG_INFO, "do_servicing()\n");
785 /* Tell devfs what events we care about */
786 tmp_event_mask = event_mask;
787 do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
788 while (!caught_signal)
791 bytes = read (fd, (char *) &info, sizeof info);
793 break; /* Must test for this first */
795 continue; /* Yes, the order is important */
798 service_name (&info);
802 int c_sighup = caught_sighup;
804 caught_signal = FALSE;
805 caught_sighup = FALSE;
808 #ifdef CONFIG_DEVFSD_VERBOSE
809 msg_logger( NO_DIE, LOG_ERR, "read error on control file: %m\n");
811 /* This is to shut up a compiler warning */
813 } /* End Function do_servicing */
815 static void service_name (const struct devfsd_notify_struct *info)
816 /* [SUMMARY] Service a single devfs change.
817 <info> The devfs change.
822 regmatch_t mbuf[MAX_SUBEXPR];
823 struct config_entry_struct *entry;
826 msg_logger( NO_DIE, LOG_INFO, "service_name()\n");
827 if (info->overrun_count > 0)
828 msg_logger( NO_DIE, LOG_ERR, "lost %u events\n", info->overrun_count);
831 /* Discard lookups on "/dev/log" and "/dev/initctl" */
832 if( info->type == DEVFSD_NOTIFY_LOOKUP &&
833 ((info->devname[0]=='l' && info->devname[1]=='o' &&
834 info->devname[2]=='g' && !info->devname[3]) ||
835 ( info->devname[0]=='i' && info->devname[1]=='n' &&
836 info->devname[2]=='i' && info->devname[3]=='t' &&
837 info->devname[4]=='c' && info->devname[5]=='t' &&
838 info->devname[6]=='l' && !info->devname[7])))
840 for (entry = first_config; entry != NULL; entry = entry->next)
842 /* First check if action matches the type, then check if name matches */
843 if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 )
845 for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
848 msg_logger( NO_DIE, LOG_INFO, "service_name(): action.what %d\n", entry->action.what);
850 switch (entry->action.what)
853 action_permissions (info, entry);
855 #ifdef CONFIG_DEVFSD_MODLOAD
857 action_modload (info, entry);
861 action_execute (info, entry, mbuf, n);
864 action_copy (info, entry, mbuf, n);
873 action_compat (info, entry->action.what);
876 #ifdef CONFIG_DEVFSD_VERBOSE
877 msg_logger( DIE, LOG_ERR, "Unknown action\n");
884 } /* End Function service_name */
886 static void action_permissions (const struct devfsd_notify_struct *info,
887 const struct config_entry_struct *entry)
888 /* [SUMMARY] Update permissions for a device entry.
889 <info> The devfs change.
890 <entry> The config file entry.
897 msg_logger( NO_DIE, LOG_INFO, "action_permission()\n");
900 if ( stat (info->devname, &statbuf) != 0 ||
901 chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 ||
902 chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0)
904 #ifdef CONFIG_DEVFSD_VERBOSE
905 msg_logger( NO_DIE, LOG_ERR, "chmod() or chown(): %s: %m\n",info->devname);
910 } /* End Function action_permissions */
912 #ifdef CONFIG_DEVFSD_MODLOAD
913 static void action_modload (const struct devfsd_notify_struct *info,
914 const struct config_entry_struct *entry)
915 /* [SUMMARY] Load a module.
916 <info> The devfs change.
917 <entry> The config file entry.
922 char device[STRING_LENGTH];
925 argv[1] = MODPROBE_SWITCH_1; /* "-k" */
926 argv[2] = MODPROBE_SWITCH_2; /* "-C" */
927 argv[3] = CONFIG_MODULES_DEVFS;
931 snprintf (device, sizeof (device), "/dev/%s", info->devname);
933 msg_logger( NO_DIE, LOG_INFO, "action_modload():%s %s %s %s %s\n",argv[0],argv[1],argv[2],argv[3],argv[4]);
935 fork_and_execute(DIE, argv[0], argv);
936 } /* End Function action_modload */
939 static void action_execute (const struct devfsd_notify_struct *info,
940 const struct config_entry_struct *entry,
941 const regmatch_t *regexpr, unsigned int numexpr)
942 /* [SUMMARY] Execute a programme.
943 <info> The devfs change.
944 <entry> The config file entry.
945 <regexpr> The number of subexpression (start, end) offsets within the
947 <numexpr> The number of elements within <<regexpr>>.
952 struct get_variable_info gv_info;
953 char *argv[MAX_ARGS + 1];
954 char largv[MAX_ARGS + 1][STRING_LENGTH];
962 gv_info.devname = info->devname;
963 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
964 for (count = 0; entry->u.execute.argv[count] != NULL; ++count)
966 expand_expression (largv[count], STRING_LENGTH,
967 entry->u.execute.argv[count],
968 get_variable, &gv_info,
969 gv_info.devname, regexpr, numexpr );
970 argv[count] = largv[count];
976 for(i=0;argv[i]!=NULL;i++) /* argv[i] < MAX_ARGS + 1 */
979 if( (strlen(buff)+ 1 + strlen(argv[i])) >= 512)
981 strcat(buff,argv[i]);
984 msg_logger( NO_DIE, LOG_INFO, "action_execute(): %s",buff);
987 fork_and_execute(NO_DIE, argv[0], argv);
988 } /* End Function action_execute */
991 static void action_copy (const struct devfsd_notify_struct *info,
992 const struct config_entry_struct *entry,
993 const regmatch_t *regexpr, unsigned int numexpr)
994 /* [SUMMARY] Copy permissions.
995 <info> The devfs change.
996 <entry> The config file entry.
997 <regexpr> This list of subexpression (start, end) offsets within the
999 <numexpr> The number of elements in <<regexpr>>.
1004 struct get_variable_info gv_info;
1005 struct stat source_stat, dest_stat;
1006 char source[STRING_LENGTH], destination[STRING_LENGTH];
1007 dest_stat.st_mode = 0;
1010 msg_logger( NO_DIE, LOG_INFO, "action_copy()\n");
1013 if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) )
1015 gv_info.info = info;
1016 gv_info.devname = info->devname;
1018 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
1019 expand_expression (source, STRING_LENGTH, entry->u.copy.source,
1020 get_variable, &gv_info, gv_info.devname,
1023 expand_expression (destination, STRING_LENGTH, entry->u.copy.destination,
1024 get_variable, &gv_info, gv_info.devname,
1027 if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0)
1029 lstat (destination, &dest_stat);
1030 new_mode = source_stat.st_mode & ~S_ISVTX;
1031 if (info->type == DEVFSD_NOTIFY_CREATE)
1032 new_mode |= S_ISVTX;
1033 else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) )
1034 new_mode |= S_ISVTX;
1036 if ( !copy_inode (destination, &dest_stat, new_mode, source, &source_stat) && (errno != EEXIST))
1037 msg_logger( NO_DIE, LOG_ERR, "copy_inode(): %s to %s: %m\n", source, destination);
1039 copy_inode (destination, &dest_stat, new_mode, source, &source_stat);
1042 } /* End Function action_copy */
1044 static void action_compat (const struct devfsd_notify_struct *info, unsigned int action)
1045 /* [SUMMARY] Process a compatibility request.
1046 <info> The devfs change.
1047 <action> The action to take.
1051 const char *compat_name = NULL;
1052 const char *dest_name = info->devname;
1054 char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
1055 int mode, host, bus, target, lun;
1058 /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
1059 const char *fmt[] = { NULL ,
1060 "sg/c%db%dt%du%d", /* scsi/generic */
1061 "sd/c%db%dt%du%d", /* scsi/disc */
1062 "sr/c%db%dt%du%d", /* scsi/cd */
1063 "sd/c%db%dt%du%dp%d", /* scsi/part */
1064 "st/c%db%dt%du%dm%d%c", /* scsi/mt */
1065 "ide/hd/c%db%dt%du%d", /* ide/host/disc */
1066 "ide/cd/c%db%dt%du%d", /* ide/host/cd */
1067 "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
1068 "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
1071 /* First construct compatibility name */
1074 case AC_MKOLDCOMPAT:
1075 case AC_RMOLDCOMPAT:
1076 compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor);
1078 case AC_MKNEWCOMPAT:
1079 case AC_RMNEWCOMPAT:
1080 ptr = strrchr (info->devname, '/') + 1;
1081 i=scan_dev_name(info->devname, info->namelen, ptr);
1084 msg_logger( NO_DIE, LOG_INFO, "action_compat(): scan_dev_name() returned %d\n", i);
1091 sscanf (info->devname +((i<6)?5:4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
1092 snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + ((i>5)?4:0));
1093 dest_name = dest_buf;
1094 compat_name = compat_buf;
1097 /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
1098 if( i == 1 || i == 2 || i == 3 || i == 6 || i ==7 )
1099 sprintf ( compat_buf, fmt[i], host, bus, target, lun);
1101 /* 4 == scsi/part 8 == ide/host/part */
1102 if( i == 4 || i == 8)
1103 sprintf ( compat_buf, fmt[i], host, bus, target, lun, atoi (ptr + 4) );
1108 rewind_ = info->devname[info->namelen - 1];
1112 if(ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
1113 mode = ptr[2] - 107; /* 1 or 2 */
1116 sprintf (compat_buf, fmt [i], host, bus, target, lun, mode, rewind_);
1119 /* 9 == ide/host/mt */
1121 snprintf (compat_buf, sizeof (compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
1123 } /* switch(action) */
1125 if(compat_name == NULL )
1129 msg_logger( NO_DIE, LOG_INFO, "action_compat(): %s\n", compat_name);
1132 /* Now decide what to do with it */
1135 case AC_MKOLDCOMPAT:
1136 case AC_MKNEWCOMPAT:
1137 mksymlink (dest_name, compat_name);
1139 case AC_RMOLDCOMPAT:
1140 case AC_RMNEWCOMPAT:
1142 if (unlink (compat_name) != 0)
1143 msg_logger( NO_DIE, LOG_ERR, "unlink(): %s: %m\n", compat_name);
1145 unlink (compat_name);
1149 } /* switch(action) */
1150 } /* End Function action_compat */
1152 static void restore(char *spath, struct stat source_stat, int rootlen)
1154 char dpath[STRING_LENGTH];
1155 struct stat dest_stat;
1158 msg_logger( NO_DIE, LOG_INFO, "restore()\n");
1161 dest_stat.st_mode = 0;
1162 snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen);
1163 lstat (dpath, &dest_stat);
1165 if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) )
1166 copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
1168 if ( S_ISDIR (source_stat.st_mode) )
1169 dir_operation(RESTORE, spath, rootlen,NULL);
1173 static int copy_inode (const char *destpath, const struct stat *dest_stat,
1175 const char *sourcepath, const struct stat *source_stat)
1176 /* [SUMMARY] Copy an inode.
1177 <destpath> The destination path. An existing inode may be deleted.
1178 <dest_stat> The destination stat(2) information.
1179 <new_mode> The desired new mode for the destination.
1180 <sourcepath> The source path.
1181 <source_stat> The source stat(2) information.
1182 [RETURNS] TRUE on success, else FALSE.
1185 int source_len, dest_len;
1186 char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
1188 struct sockaddr_un un_addr;
1189 char symlink_val[STRING_LENGTH];
1192 msg_logger( NO_DIE, LOG_INFO, "copy_inode()\n");
1195 if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) )
1198 if ( S_ISLNK (source_stat->st_mode) )
1200 if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 ||
1201 ( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 )
1203 source_link[source_len] = '\0';
1204 dest_link[dest_len] = '\0';
1205 if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) )
1208 symlink (source_link, destpath);
1211 } /* Else not a symlink */
1212 chmod (destpath, new_mode & ~S_IFMT);
1213 chown (destpath, source_stat->st_uid, source_stat->st_gid);
1216 /* Different types: unlink and create */
1218 switch (source_stat->st_mode & S_IFMT)
1221 if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 )
1223 un_addr.sun_family = AF_UNIX;
1224 snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath);
1225 val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr);
1227 if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0)
1231 if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 )
1233 symlink_val[val] = '\0';
1234 if (symlink (symlink_val, destpath) == 0)
1238 if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 )
1241 if (chmod (destpath, new_mode & ~S_IFMT) != 0)
1247 if (mknod (destpath, new_mode, source_stat->st_rdev) != 0)
1251 if (mkdir (destpath, new_mode & ~S_IFMT) != 0)
1254 if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
1259 } /* End Function copy_inode */
1261 static void free_config ()
1262 /* [SUMMARY] Free the configuration information.
1266 struct config_entry_struct *c_entry;
1270 msg_logger( NO_DIE, LOG_INFO, "free_config()\n");
1273 for (c_entry = first_config; c_entry != NULL; c_entry = next)
1277 next = c_entry->next;
1278 regfree (&c_entry->preg);
1279 if (c_entry->action.what == AC_EXECUTE)
1281 for (count = 0; count < MAX_ARGS; ++count)
1283 if (c_entry->u.execute.argv[count] == NULL)
1285 free (c_entry->u.execute.argv[count]);
1290 first_config = NULL;
1292 } /* End Function free_config */
1294 static int get_uid_gid (int flag, const char *string)
1295 /* [SUMMARY] Convert a string to a UID or GID value.
1296 <flag> "UID" or "GID".
1297 <string> The string.
1298 [RETURNS] The UID or GID value.
1301 struct passwd *pw_ent;
1302 struct group *grp_ent;
1303 #ifdef CONFIG_DEVFSD_VERBOSE
1308 msg_logger( NO_DIE, LOG_INFO, "get_uid_gid()\n");
1311 if(flag != UID && flag != GID )
1312 msg_logger( DIE, LOG_ERR,"get_uid_gid(): flag != UID && flag != GID\n");
1315 if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) )
1316 return atoi (string);
1318 if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL )
1319 return (pw_ent->pw_uid);
1321 if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL )
1322 return (grp_ent->gr_gid);
1323 #ifdef CONFIG_DEVFSD_VERBOSE
1327 msg_logger( NO_DIE, LOG_ERR,"unknown %s: %s, defaulting to %cID=0\n", msg, string, msg[0] - 32);
1330 }/* End Function get_uid_gid */
1332 static mode_t get_mode (const char *string)
1333 /* [SUMMARY] Convert a string to a mode value.
1334 <string> The string.
1335 [RETURNS] The mode value.
1341 msg_logger( NO_DIE, LOG_INFO, "get_mode()\n");
1344 if ( isdigit (string[0]) )
1345 return strtoul (string, NULL, 8);
1346 if (strlen (string) != 9)
1347 #ifdef CONFIG_DEVFSD_VERBOSE
1348 msg_logger( DIE, LOG_ERR, "bad mode: %s\n", string);
1356 if(string[0]=='r'||string[0]=='w'||string[0]=='x')
1362 } /* End Function get_mode */
1364 static void signal_handler (int sig)
1367 msg_logger( NO_DIE, LOG_INFO, "signal_handler()\n");
1370 caught_signal = TRUE;
1372 caught_sighup = TRUE;
1373 #ifdef CONFIG_DEVFSD_VERBOSE
1374 msg_logger( NO_DIE, LOG_INFO, "Caught %s\n",(sig == SIGHUP)?"SIGHUP" : "SIGUSR1");
1376 } /* End Function signal_handler */
1378 static const char *get_variable (const char *variable, void *info)
1380 struct get_variable_info *gv_info = info;
1381 static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH];
1382 const char *field_names[] = { "hostname", "mntpt", "devpath", "devname",
1383 "uid", "gid", "mode", hostname, mount_point,
1384 gv_info->devpath, gv_info->devname, 0 };
1387 msg_logger( NO_DIE, LOG_INFO, "get_variable()\n");
1390 if (gethostname (hostname, STRING_LENGTH - 1) != 0)
1391 #ifdef CONFIG_DEVFSD_VERBOSE
1392 msg_logger( DIE, LOG_ERR, "gethostname(): %m\n");
1396 /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
1397 hostname[STRING_LENGTH - 1] = '\0';
1399 /* compare_string_array returns i>=0 */
1400 i=compare_string_array(field_names, variable);
1402 if ( i > 6 && (i > 1 && gv_info == NULL))
1404 if( i >= 0 || i <= 3)
1407 msg_logger( NO_DIE, LOG_INFO, "get_variable(): i=%d %s\n",i ,field_names[i+7]);
1409 return(field_names[i+7]);
1413 sprintf (sbuf, "%u", gv_info->info->uid);
1415 sprintf (sbuf, "%u", gv_info->info->gid);
1417 sprintf (sbuf, "%o", gv_info->info->mode);
1419 msg_logger( NO_DIE, LOG_INFO, "get_variable(): %s\n", sbuf);
1422 } /* End Function get_variable */
1424 static void service(struct stat statbuf, char *path)
1426 struct devfsd_notify_struct info;
1429 msg_logger( NO_DIE, LOG_INFO, "service()\n");
1432 memset (&info, 0, sizeof info);
1433 info.type = DEVFSD_NOTIFY_REGISTERED;
1434 info.mode = statbuf.st_mode;
1435 info.major = major (statbuf.st_rdev);
1436 info.minor = minor (statbuf.st_rdev);
1437 info.uid = statbuf.st_uid;
1438 info.gid = statbuf.st_gid;
1439 snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1);
1440 info.namelen = strlen (info.devname);
1441 service_name (&info);
1442 if ( S_ISDIR (statbuf.st_mode) )
1443 dir_operation(SERVICE,path,0,NULL);
1446 static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
1447 /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
1448 <flag> To choose which function to perform
1449 <dp> The directory pointer. This is closed upon completion.
1450 <dir_name> The name of the directory.
1451 <rootlen> string length parameter.
1455 struct stat statbuf;
1458 char path[STRING_LENGTH];
1462 msg_logger( NO_DIE, LOG_INFO, "dir_operation()\n");
1465 if((dp = opendir( dir_name))==NULL)
1468 msg_logger( NO_DIE, LOG_ERR, "opendir(): %s: %m\n", dir_name);
1473 while ( (de = readdir (dp) ) != NULL )
1476 if(de->d_name && *de->d_name == '.' && (!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2])))
1478 snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name);
1480 msg_logger( NO_DIE, LOG_ERR, "dir_operation(): %s\n", path);
1483 if (lstat (path, &statbuf) != 0)
1486 msg_logger( NO_DIE, LOG_ERR, "%s: %m\n", path);
1493 service(statbuf,path);
1496 restore(path, statbuf, var);
1499 read_config_file (path, var, event_mask);
1504 } /* End Function do_scan_and_service */
1506 static int mksymlink (const char *oldpath, const char *newpath)
1507 /* [SUMMARY] Create a symlink, creating intervening directories as required.
1508 <oldpath> The string contained in the symlink.
1509 <newpath> The name of the new symlink.
1510 [RETURNS] 0 on success, else -1.
1514 msg_logger( NO_DIE, LOG_INFO, "mksymlink()\n", newpath);
1518 if ( !make_dir_tree (newpath) )
1521 if (symlink (oldpath, newpath) != 0)
1523 if (errno != EEXIST)
1526 msg_logger( NO_DIE, LOG_ERR, "mksymlink(): %s to %s: %m\n", oldpath, newpath);
1532 } /* End Function mksymlink */
1535 static int make_dir_tree (const char *path)
1536 /* [SUMMARY] Creating intervening directories for a path as required.
1537 <path> The full pathname (including the leaf node).
1538 [RETURNS] TRUE on success, else FALSE.
1542 msg_logger( NO_DIE, LOG_INFO, "make_dir_tree()\n");
1544 if (bb_make_directory( dirname((char *)path), -1, FILEUTILS_RECUR )==-1)
1547 msg_logger( NO_DIE, LOG_ERR, "make_dir_tree(): %s: %m\n", path);
1552 } /* End Function make_dir_tree */
1554 static int expand_expression(char *output, unsigned int outsize,
1556 const char *(*get_variable_func)(const char *variable, void *info),
1558 const char *devname,
1559 const regmatch_t *ex, unsigned int numexp)
1560 /* [SUMMARY] Expand environment variables and regular subexpressions in string.
1561 <output> The output expanded expression is written here.
1562 <length> The size of the output buffer.
1563 <input> The input expression. This may equal <<output>>.
1564 <get_variable> A function which will be used to get variable values. If
1565 this returns NULL, the environment is searched instead. If this is NULL,
1566 only the environment is searched.
1567 <info> An arbitrary pointer passed to <<get_variable>>.
1568 <devname> Device name; specifically, this is the string that contains all
1569 of the regular subexpressions.
1570 <ex> Array of start / end offsets into info->devname for each subexpression
1571 <numexp> Number of regular subexpressions found in <<devname>>.
1572 [RETURNS] TRUE on success, else FALSE.
1575 char temp[STRING_LENGTH];
1578 msg_logger( NO_DIE, LOG_INFO, "expand_expression()\n");
1581 if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) )
1583 expand_regexp (output, outsize, temp, devname, ex, numexp);
1585 } /* End Function expand_expression */
1587 static void expand_regexp (char *output, size_t outsize, const char *input,
1588 const char *devname,
1589 const regmatch_t *ex, unsigned int numex )
1590 /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
1591 <output> The output expanded expression is written here.
1592 <outsize> The size of the output buffer.
1593 <input> The input expression. This may NOT equal <<output>>, because
1594 supporting that would require yet another string-copy. However, it's not
1595 hard to write a simple wrapper function to add this functionality for those
1596 few cases that need it.
1597 <devname> Device name; specifically, this is the string that contains all
1598 of the regular subexpressions.
1599 <ex> An array of start and end offsets into <<devname>>, one for each
1601 <numex> Number of subexpressions in the offset-array <<ex>>.
1605 const char last_exp = '0' - 1 + numex;
1609 msg_logger( NO_DIE, LOG_INFO, "expand_regexp()\n");
1612 /* Guarantee NULL termination by writing an explicit '\0' character into
1613 the very last byte */
1615 output[--outsize] = '\0';
1616 /* Copy the input string into the output buffer, replacing '\\' with '\'
1617 and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
1618 codes are deleted */
1619 while ( (c != '\0') && (outsize != 0) )
1629 if ((c >= '0') && (c <= last_exp))
1631 const regmatch_t *subexp = ex + (c - '0');
1632 unsigned int sublen = subexp->rm_eo - subexp->rm_so;
1634 /* Range checking */
1635 if (sublen > outsize)
1637 strncpy (output, devname + subexp->rm_so, sublen);
1648 } /* End Function expand_regexp */
1651 /* from compat_name.c */
1653 struct translate_struct
1655 char *match; /* The string to match to (up to length) */
1656 char *format; /* Format of output, "%s" takes data past match string,
1657 NULL is effectively "%s" (just more efficient) */
1660 static struct translate_struct translate_table[] =
1663 {"printers/", "lp%s"},
1665 {"parports/", "parport%s"},
1668 {"loop/", "loop%s"},
1669 {"floppy/", "fd%s"},
1671 {"md/", "md%s"}, /* Meta-devices */
1675 {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
1677 {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
1678 {"tts/E", "ttyE%s"}, /* Stallion serial driver */
1679 {"cua/E", "cue%s"}, /* Stallion serial driver callout */
1680 {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
1681 {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
1682 {"ip2/", "ip2%s"}, /* Computone serial driver control */
1683 {"tts/F", "ttyF%s"}, /* Computone serial driver */
1684 {"cua/F", "cuf%s"}, /* Computone serial driver callout */
1685 {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
1686 {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
1687 {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
1688 {"cua/", "cua%s"}, /* Generic serial: must be after others */
1689 {"input/js", "js%s"}, /* Joystick driver */
1693 const char *get_old_name (const char *devname, unsigned int namelen,
1694 char *buffer, unsigned int major, unsigned int minor)
1695 /* [SUMMARY] Translate a kernel-supplied name into an old name.
1696 <devname> The device name provided by the kernel.
1697 <namelen> The length of the name.
1698 <buffer> A buffer that may be used. This should be at least 128 bytes long.
1699 <major> The major number for the device.
1700 <minor> The minor number for the device.
1701 [RETURNS] A pointer to the old name if known, else NULL.
1704 const char *compat_name = NULL;
1706 struct translate_struct *trans;
1713 /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
1714 const char *fmt[] = { NULL ,
1715 "sg%u", /* scsi/generic */
1716 NULL, /* scsi/disc */
1717 "sr%u", /* scsi/cd */
1718 NULL, /* scsi/part */
1719 "nst%u%c", /* scsi/mt */
1720 "hd%c" , /* ide/host/disc */
1721 "hd%c" , /* ide/host/cd */
1722 "hd%c%s", /* ide/host/part */
1723 "%sht%d", /* ide/host/mt */
1724 "sbpcd%u", /* sbp/ */
1726 "%cty%c%c", /* pty/ */
1730 msg_logger( NO_DIE, LOG_INFO, "get_old_name()\n");
1733 for (trans = translate_table; trans->match != NULL; ++trans)
1735 len = strlen (trans->match);
1737 if (strncmp (devname, trans->match, len) == 0)
1739 if (trans->format == NULL)
1740 return (devname + len);
1741 sprintf (buffer, trans->format, devname + len);
1746 ptr = (strrchr (devname, '/') + 1);
1747 i = scan_dev_name(devname, namelen, ptr);
1749 if( i > 0 && i < 13)
1750 compat_name = buffer;
1755 msg_logger( NO_DIE, LOG_INFO, "get_old_name(): scan_dev_name() returned %d\n", i);
1758 /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
1759 if( i == 1 || i == 3 || i == 10 )
1760 sprintf (buffer, fmt[i], minor);
1762 /* 2 ==scsi/disc, 4 == scsi/part */
1763 if( i == 2 || i == 4)
1764 compat_name = write_old_sd_name (buffer, major, minor,((i == 2)?"":(ptr + 4)));
1772 sprintf (buffer, fmt[i], minor & 0x1f, mode);
1773 if (devname[namelen - 1] != 'n')
1776 /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
1777 if( i == 6 || i == 7 || i == 8 )
1778 sprintf (buffer, fmt[i] , get_old_ide_name (major, minor), ptr + 4); /* last arg should be ignored for i == 6 or i== 7 */
1780 /* 9 == ide/host/mt */
1782 sprintf (buffer, fmt[i], ptr + 2, minor & 0x7f);
1787 sprintf (buffer, fmt[i], devname + 4);
1788 if (buffer[3] == '0')
1794 pty1 = "pqrstuvwxyzabcde";
1795 pty2 = "0123456789abcdef";
1796 indexx = atoi (devname + 5);
1797 sprintf (buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
1800 if(compat_name!=NULL)
1801 msg_logger( NO_DIE, LOG_INFO, "get_old_name(): compat_name %s\n", compat_name);
1803 return (compat_name);
1804 } /* End Function get_old_name */
1806 static char get_old_ide_name (unsigned int major, unsigned int minor)
1807 /* [SUMMARY] Get the old IDE name for a device.
1808 <major> The major number for the device.
1809 <minor> The minor number for the device.
1810 [RETURNS] The drive letter.
1813 char letter='y'; /* 121 */
1814 char c='a'; /* 97 */
1818 msg_logger( NO_DIE, LOG_INFO, "get_old_ide_name()\n");
1821 /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
1823 if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR ||
1824 i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR ||
1825 i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR ||
1836 } while(i<=IDE9_MAJOR);
1841 } /* End Function get_old_ide_name */
1843 static char *write_old_sd_name (char *buffer,
1844 unsigned int major, unsigned int minor,
1846 /* [SUMMARY] Write the old SCSI disc name to a buffer.
1847 <buffer> The buffer to write to.
1848 <major> The major number for the device.
1849 <minor> The minor number for the device.
1850 <part> The partition string. Must be "" for a whole-disc entry.
1851 [RETURNS] A pointer to the buffer on success, else NULL.
1854 unsigned int disc_index;
1857 msg_logger( NO_DIE, LOG_INFO, "write_old_sd_name()\n");
1862 sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part);
1865 if ( (major > 64) && (major < 72) )
1867 disc_index = ( (major - 64) << 4 ) + (minor >> 4);
1868 if (disc_index < 26)
1869 sprintf (buffer, "sd%c%s", 'a' + disc_index, part);
1871 sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part);
1875 } /* End Function write_old_sd_name */
1880 /*EXPERIMENTAL_FUNCTION*/
1882 int st_expr_expand (char *output, unsigned int length, const char *input,
1883 const char *(*get_variable_func) (const char *variable,
1886 /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
1887 <output> The output expanded expression is written here.
1888 <length> The size of the output buffer.
1889 <input> The input expression. This may equal <<output>>.
1890 <get_variable> A function which will be used to get variable values. If
1891 this returns NULL, the environment is searched instead. If this is NULL,
1892 only the environment is searched.
1893 <info> An arbitrary pointer passed to <<get_variable>>.
1894 [RETURNS] TRUE on success, else FALSE.
1899 unsigned int out_pos = 0;
1902 struct passwd *pwent;
1903 char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
1906 msg_logger( NO_DIE, LOG_INFO, "st_expr_expand()\n");
1909 if (length > BUFFER_SIZE)
1910 length = BUFFER_SIZE;
1911 for (; TRUE; ++input)
1913 switch (ch = *input)
1916 /* Variable expansion */
1917 input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info);
1922 /* Home directory expansion */
1924 if ( isspace (ch) || (ch == '/') || (ch == '\0') )
1926 /* User's own home directory: leave separator for next time */
1927 if ( ( env = getenv ("HOME") ) == NULL )
1929 #ifdef CONFIG_DEVFSD_VERBOSE
1930 msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, "HOME");
1935 if (len + out_pos >= length)
1936 goto st_expr_expand_out;
1937 memcpy (buffer + out_pos, env, len + 1);
1941 /* Someone else's home directory */
1942 for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
1945 if (len >= sizeof tmp)
1946 goto st_expr_expand_out;
1947 safe_memcpy (tmp, input, len);
1949 if ( ( pwent = getpwnam (tmp) ) == NULL )
1951 #ifdef CONFIG_DEVFSD_VERBOSE
1952 msg_logger( NO_DIE, LOG_INFO, "no pwent for: %s\n", tmp);
1956 len = strlen (pwent->pw_dir);
1957 if (len + out_pos >= length)
1958 goto st_expr_expand_out;
1959 memcpy (buffer + out_pos, pwent->pw_dir, len + 1);
1965 if (out_pos >= length)
1966 goto st_expr_expand_out;
1967 buffer[out_pos++] = ch;
1970 memcpy (output, buffer, out_pos);
1979 #ifdef CONFIG_DEVFSD_VERBOSE
1980 msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer);
1983 } /* End Function st_expr_expand */
1986 /* Private functions follow */
1988 static const char *expand_variable (char *buffer, unsigned int length,
1989 unsigned int *out_pos, const char *input,
1990 const char *(*func) (const char *variable,
1993 /* [SUMMARY] Expand a variable.
1994 <buffer> The buffer to write to.
1995 <length> The length of the output buffer.
1996 <out_pos> The current output position. This is updated.
1997 <input> A pointer to the input character pointer.
1998 <func> A function which will be used to get variable values. If this
1999 returns NULL, the environment is searched instead. If this is NULL, only
2000 the environment is searched.
2001 <info> An arbitrary pointer passed to <<func>>.
2002 <errfp> Diagnostic messages are written here.
2003 [RETURNS] A pointer to the end of this subexpression on success, else NULL.
2008 unsigned int open_braces;
2009 const char *env, *ptr;
2010 char tmp[STRING_LENGTH];
2013 msg_logger( NO_DIE, LOG_INFO, "expand_variable()\n");
2019 /* Special case for "$$": PID */
2020 sprintf ( tmp, "%d", (int) getpid () );
2022 if (len + *out_pos >= length)
2023 goto expand_variable_out;
2025 memcpy (buffer + *out_pos, tmp, len + 1);
2029 /* Ordinary variable expansion, possibly in braces */
2032 /* Simple variable expansion */
2033 for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr)
2036 if (len >= sizeof tmp)
2037 goto expand_variable_out;
2039 safe_memcpy (tmp, input, len);
2041 if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL )
2043 #ifdef CONFIG_DEVFSD_VERBOSE
2044 msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, tmp);
2049 if (len + *out_pos >= length)
2050 goto expand_variable_out;
2052 memcpy (buffer + *out_pos, env, len + 1);
2056 /* Variable in braces: check for ':' tricks */
2058 for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr)
2062 /* Must be simple variable expansion with "${var}" */
2064 if (len >= sizeof tmp)
2065 goto expand_variable_out;
2067 safe_memcpy (tmp, input, len);
2068 ptr = expand_variable (buffer, length, out_pos, tmp, func, info );
2071 return (input + len);
2073 if (ch != ':' || ptr[1] != '-' )
2075 #ifdef CONFIG_DEVFSD_VERBOSE
2076 msg_logger( NO_DIE, LOG_INFO,"illegal char in var name\n");
2080 /* It's that handy "${var:-word}" expression. Check if var is defined */
2082 if (len >= sizeof tmp)
2083 goto expand_variable_out;
2085 safe_memcpy (tmp, input, len);
2086 /* Move input pointer to ':' */
2088 /* First skip to closing brace, taking note of nested expressions */
2091 for (open_braces = 1; open_braces > 0; ch = *++ptr)
2102 #ifdef CONFIG_DEVFSD_VERBOSE
2103 msg_logger( NO_DIE, LOG_INFO,"\"}\" not found in: %s\n", input);
2111 /* At this point ptr should point to closing brace of "${var:-word}" */
2112 if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL )
2114 /* Found environment variable, so skip the input to the closing brace
2115 and return the variable */
2118 if (len + *out_pos >= length)
2119 goto expand_variable_out;
2121 memcpy (buffer + *out_pos, env, len + 1);
2125 /* Environment variable was not found, so process word. Advance input
2126 pointer to start of word in "${var:-word}" */
2129 if (len >= sizeof tmp)
2130 goto expand_variable_out;
2132 safe_memcpy (tmp, input, len);
2134 if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) )
2137 if (len + *out_pos >= length)
2138 goto expand_variable_out;
2140 memcpy (buffer + *out_pos, tmp, len + 1);
2143 expand_variable_out:
2144 #ifdef CONFIG_DEVFSD_VERBOSE
2145 msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer);
2148 } /* End Function expand_variable */
2151 static const char *get_variable_v2 (const char *variable,
2152 const char *(*func) (const char *variable, void *info),
2154 /* [SUMMARY] Get a variable from the environment or .
2155 <variable> The variable name.
2156 <func> A function which will be used to get the variable. If this returns
2157 NULL, the environment is searched instead. If this is NULL, only the
2158 environment is searched.
2159 [RETURNS] The value of the variable on success, else NULL.
2165 msg_logger( NO_DIE, LOG_INFO, "get_variable_v2()\n");
2170 value = (*func) (variable, info);
2174 return getenv (variable);
2175 } /* End Function get_variable */