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>
73 #include <sys/sysmacros.h>
76 /* Various defines taken from linux/major.h */
89 /* Various defines taken from linux/devfs_fs.h */
90 #define DEVFSD_PROTOCOL_REVISION_KERNEL 5
91 #define DEVFSD_IOCTL_BASE 'd'
92 /* These are the various ioctls */
93 #define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int)
94 #define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int)
95 #define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int)
96 #define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int)
97 #define DEVFSD_NOTIFY_REGISTERED 0
98 #define DEVFSD_NOTIFY_UNREGISTERED 1
99 #define DEVFSD_NOTIFY_ASYNC_OPEN 2
100 #define DEVFSD_NOTIFY_CLOSE 3
101 #define DEVFSD_NOTIFY_LOOKUP 4
102 #define DEVFSD_NOTIFY_CHANGE 5
103 #define DEVFSD_NOTIFY_CREATE 6
104 #define DEVFSD_NOTIFY_DELETE 7
105 #define DEVFS_PATHLEN 1024
106 /* Never change this otherwise the binary interface will change */
108 struct devfsd_notify_struct
109 { /* Use native C types to ensure same types in kernel and user space */
110 unsigned int type; /* DEVFSD_NOTIFY_* value */
111 unsigned int mode; /* Mode of the inode or device entry */
112 unsigned int major; /* Major number of device entry */
113 unsigned int minor; /* Minor number of device entry */
114 unsigned int uid; /* Uid of process, inode or device entry */
115 unsigned int gid; /* Gid of process, inode or device entry */
116 unsigned int overrun_count; /* Number of lost events */
117 unsigned int namelen; /* Number of characters not including '\0' */
118 /* The device name MUST come last */
119 char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */
122 #define BUFFER_SIZE 16384
123 #define DEVFSD_VERSION "1.3.25"
124 #define CONFIG_FILE "/etc/devfsd.conf"
125 #define MODPROBE "/sbin/modprobe"
126 #define MODPROBE_SWITCH_1 "-k"
127 #define MODPROBE_SWITCH_2 "-C"
128 #define CONFIG_MODULES_DEVFS "/etc/modules.devfs"
129 #define MAX_ARGS (6 + 1)
130 #define MAX_SUBEXPR 10
131 #define STRING_LENGTH 255
133 /* for get_uid_gid() */
137 /* for msg_logger(), do_ioctl(),
138 fork_and_execute() */
142 /* for dir_operation() */
145 #define READ_CONFIG 2
147 /* Update only after changing code to reflect new protocol */
148 #define DEVFSD_PROTOCOL_REVISION_DAEMON 5
150 /* Compile-time check */
151 #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
152 #error protocol version mismatch. Update your kernel headers
155 #define AC_PERMISSIONS 0
158 #define AC_MFUNCTION 3 /* not supported by busybox */
159 #define AC_CFUNCTION 4 /* not supported by busybox */
162 #define AC_MKOLDCOMPAT 7
163 #define AC_MKNEWCOMPAT 8
164 #define AC_RMOLDCOMPAT 9
165 #define AC_RMNEWCOMPAT 10
166 #define AC_RESTORE 11
169 struct permissions_type
178 char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
184 const char *destination;
193 struct config_entry_struct
195 struct action_type action;
199 struct permissions_type permissions;
200 struct execute_type execute;
201 struct copy_type copy;
204 struct config_entry_struct *next;
207 struct get_variable_info
209 const struct devfsd_notify_struct *info;
211 char devpath[STRING_LENGTH];
214 static void dir_operation(int , const char * , int, unsigned long* );
215 static void service(struct stat statbuf, char *path);
216 static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *);
217 static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
218 static int mksymlink (const char *oldpath, const char *newpath);
219 static void read_config_file (char *path, int optional, unsigned long *event_mask);
220 static void process_config_line (const char *, unsigned long *);
221 static int do_servicing (int, unsigned long);
222 static void service_name (const struct devfsd_notify_struct *);
223 static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *);
224 static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *,
225 const regmatch_t *, unsigned);
226 #ifdef CONFIG_DEVFSD_MODLOAD
227 static void action_modload (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
229 static void action_copy (const struct devfsd_notify_struct *, const struct config_entry_struct *,
230 const regmatch_t *, unsigned);
231 static void action_compat (const struct devfsd_notify_struct *, unsigned);
232 static void free_config (void);
233 static void restore(char *spath, struct stat source_stat, int rootlen);
234 static int copy_inode (const char *, const struct stat *, mode_t, const char *, const struct stat *);
235 static mode_t get_mode (const char *);
236 static void signal_handler (int);
237 static const char *get_variable (const char *, void *);
238 static int make_dir_tree (const char *);
239 static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
240 const char *, const regmatch_t *, unsigned );
241 static void expand_regexp (char *, size_t, const char *, const char *, const regmatch_t *, unsigned );
242 static const char *expand_variable( char *, unsigned, unsigned *, const char *,
243 const char *(*) (const char *, void *), void * );
244 static const char *get_variable_v2(const char *, const char *(*) (const char *, void *), void *);
245 static char get_old_ide_name (unsigned , unsigned);
246 static char *write_old_sd_name (char *, unsigned, unsigned, char *);
248 /* busybox functions */
249 #if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
250 static void msg_logger(int die, int pri, const char * fmt, ... );
252 static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag);
253 static void fork_and_execute(int die, char *arg0, char **arg );
254 static int get_uid_gid ( int, const char *);
255 static void safe_memcpy( char * dest, const char * src, int len);
256 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr);
257 static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr);
259 /* Structs and vars */
260 static struct config_entry_struct *first_config = NULL;
261 static struct config_entry_struct *last_config = NULL;
262 static const char *mount_point = NULL;
263 static volatile int caught_signal = FALSE;
264 static volatile int caught_sighup = FALSE;
265 static struct initial_symlink_struct
269 } initial_symlinks[] =
271 {"/proc/self/fd", "fd"},
278 static struct event_type
280 unsigned int type; /* The DEVFSD_NOTIFY_* value */
281 const char *config_name; /* The name used in the config file */
284 {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
285 {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
286 {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
287 {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
288 {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
289 {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
290 {DEVFSD_NOTIFY_CREATE, "CREATE"},
291 {DEVFSD_NOTIFY_DELETE, "DELETE"},
295 /* busybox functions and messages */
297 const char * const bb_msg_proto_rev = "protocol revision";
298 #ifdef CONFIG_DEVFSD_VERBOSE
299 const char * const bb_msg_bad_config = "bad %s config file: %s\n";
300 const char * const bb_msg_small_buffer = "buffer too small\n";
301 const char * const bb_msg_variable_not_found = "variable: %s not found\n";
304 #if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
305 static void msg_logger(int die, int pri, const char * fmt, ... )
310 if (access ("/dev/log", F_OK) == 0)
312 openlog(bb_applet_name, 0, LOG_DAEMON);
313 vsyslog( pri , fmt , ap);
319 bb_verror_msg(fmt, ap);
326 static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag)
328 #ifdef CONFIG_DEVFSD_VERBOSE
329 if (ioctl (fd, request, event_mask_flag) == -1)
330 msg_logger(die, LOG_ERR, "ioctl(): %m\n");
332 if (ioctl (fd, request, event_mask_flag) == -1)
337 static void fork_and_execute(int die, char *arg0, char **arg )
345 /* Parent: Error : die or return */
346 #ifdef CONFIG_DEVFSD_VERBOSE
347 msg_logger(die, LOG_ERR,(char *) bb_msg_memory_exhausted);
354 /* Parent : ok : return or exit */
362 /* Child : if arg0 != NULL do execvp */
366 #ifdef CONFIG_DEVFSD_VERBOSE
367 msg_logger(DIE, LOG_ERR, "execvp(): %s: %m\n", arg0);
374 static void safe_memcpy( char *dest, const char *src, int len)
376 memcpy (dest , src , len );
380 static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr)
382 if( d[n - 4]=='d' && d[n - 3]=='i' && d[n - 2]=='s' && d[n - 1]=='c')
383 return (2 + addendum);
384 else if( d[n - 2]=='c' && d[n - 1]=='d')
385 return (3 + addendum);
386 else if(ptr[0]=='p' && ptr[1]=='a' && ptr[2]=='r' && ptr[3]=='t')
387 return (4 + addendum);
388 else if( ptr[n - 2]=='m' && ptr[n - 1]=='t')
389 return (5 + addendum);
394 static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr)
396 if(d[0]=='s' && d[1]=='c' && d[2]=='s' && d[3]=='i' && d[4]=='/')
398 if( d[n - 7]=='g' && d[n - 6]=='e' && d[n - 5]=='n' &&
399 d[n - 4]=='e' && d[n - 3]=='r' && d[n - 2]=='i' &&
402 return scan_dev_name_common(d, n, 0, ptr);
404 else if(d[0]=='i' && d[1]=='d' && d[2]=='e' && d[3]=='/' &&
405 d[4]=='h' && d[5]=='o' && d[6]=='s' && d[7]=='t')
407 return scan_dev_name_common(d, n, 4, ptr);
409 else if(d[0]=='s' && d[1]=='b' && d[2]=='p' && d[3]=='/')
413 else if(d[0]=='v' && d[1]=='c' && d[2]=='c' && d[3]=='/')
417 else if(d[0]=='p' && d[1]=='t' && d[2]=='y' && d[3]=='/')
424 /* Public functions follow */
426 int devfsd_main (int argc, char **argv)
428 int print_version = FALSE;
429 #ifdef CONFIG_DEVFSD_FG_NP
430 int do_daemon = TRUE;
431 int no_polling = FALSE;
434 int fd, proto_rev, count;
435 unsigned long event_mask = 0;
436 struct sigaction new_action;
437 struct initial_symlink_struct *curr;
442 for (count = 2; count < argc; ++count)
444 if(argv[count][0] == '-')
446 if(argv[count][1]=='v' && !argv[count][2]) /* -v */
447 print_version = TRUE;
448 #ifdef CONFIG_DEVFSD_FG_NP
449 else if(argv[count][1]=='f' && argv[count][2]=='g' && !argv[count][3]) /* -fg */
451 else if(argv[count][1]=='n' && argv[count][2]=='p' && !argv[count][3]) /* -np */
459 /* strip last / from mount point, so we don't need to check for it later */
460 while( argv[1][1]!='\0' && argv[1][strlen(argv[1])-1] == '/' )
461 argv[1][strlen(argv[1]) -1] = '\0';
463 mount_point = argv[1];
465 if (chdir (mount_point) != 0)
466 #ifdef CONFIG_DEVFSD_VERBOSE
467 bb_error_msg_and_die( " %s: %m", mount_point);
472 fd = bb_xopen (".devfsd", O_RDONLY);
474 if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0)
475 #ifdef CONFIG_DEVFSD_VERBOSE
476 bb_error_msg( "FD_CLOEXEC");
481 do_ioctl(DIE, fd, DEVFSDIOC_GET_PROTO_REV,(int )&proto_rev);
483 /*setup initial entries */
484 for (curr = initial_symlinks; curr->dest != NULL; ++curr)
485 symlink (curr->dest, curr->name);
487 /* NB: The check for CONFIG_FILE is done in read_config_file() */
489 if ( print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) )
491 bb_printf( "%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
492 bb_applet_name,DEVFSD_VERSION,bb_msg_proto_rev,
493 DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev);
494 if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
495 bb_error_msg_and_die( "%s mismatch!",bb_msg_proto_rev);
496 exit(EXIT_SUCCESS); /* -v */
498 /* Tell kernel we are special (i.e. we get to see hidden entries) */
499 do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, 0);
501 sigemptyset (&new_action.sa_mask);
502 new_action.sa_flags = 0;
504 /* Set up SIGHUP and SIGUSR1 handlers */
505 new_action.sa_handler = signal_handler;
506 if (sigaction (SIGHUP, &new_action, NULL) != 0 || sigaction (SIGUSR1, &new_action, NULL) != 0 )
507 #ifdef CONFIG_DEVFSD_VERBOSE
508 bb_error_msg_and_die( "sigaction()");
513 bb_printf("%s v%s started for %s\n",bb_applet_name, DEVFSD_VERSION, mount_point);
515 /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
517 read_config_file (CONFIG_FILE, FALSE, &event_mask);
518 /* Do the scan before forking, so that boot scripts see the finished product */
519 dir_operation(SERVICE,mount_point,0,NULL);
520 #ifdef CONFIG_DEVFSD_FG_NP
526 /* Release so that the child can grab it */
527 do_ioctl(DIE, fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
528 fork_and_execute(DIE, NULL, NULL);
529 setsid (); /* Prevent hangups and become pgrp leader */
530 #ifdef CONFIG_DEVFSD_FG_NP
533 setpgid (0, 0); /* Become process group leader */
538 do_scan = do_servicing (fd, event_mask);
541 read_config_file (CONFIG_FILE, FALSE, &event_mask);
543 dir_operation(SERVICE,mount_point,0,NULL);
545 } /* End Function main */
548 /* Private functions follow */
550 static void read_config_file (char *path, int optional, unsigned long *event_mask)
551 /* [SUMMARY] Read a configuration database.
552 <path> The path to read the database from. If this is a directory, all
553 entries in that directory will be read (except hidden entries).
554 <optional> If TRUE, the routine will silently ignore a missing config file.
555 <event_mask> The event mask is written here. This is not initialised.
561 char buf[STRING_LENGTH];
565 msg_logger( NO_DIE, LOG_INFO, "read_config_file(): %s\n", path);
567 if (stat (path, &statbuf) == 0 )
569 /* Don't read 0 length files: ignored */
570 /*if( statbuf.st_size == 0 )
572 if ( S_ISDIR (statbuf.st_mode) )
574 /* strip last / from dirname so we don't need to check for it later */
575 while( path && path[1]!='\0' && path[strlen(path)-1] == '/')
576 path[strlen(path) -1] = '\0';
578 dir_operation(READ_CONFIG, path, 0, event_mask);
581 if ( ( fp = fopen (path, "r") ) != NULL )
583 while (fgets (buf, STRING_LENGTH, fp) != NULL)
585 /* Skip whitespace */
586 for (line = buf; isspace (*line); ++line)
588 if (line[0] == '\0' || line[0] == '#' )
590 process_config_line (line, event_mask);
594 goto read_config_file_err;
597 read_config_file_err:
598 #ifdef CONFIG_DEVFSD_VERBOSE
599 msg_logger(((optional == 0 ) && (errno == ENOENT))? DIE : NO_DIE, LOG_ERR, "read config file: %s: %m\n", path);
601 if(optional == 0 && errno == ENOENT)
606 } /* End Function read_config_file */
608 static void process_config_line (const char *line, unsigned long *event_mask)
609 /* [SUMMARY] Process a line from a configuration file.
610 <line> The configuration line.
611 <event_mask> The event mask is written here. This is not initialised.
616 struct config_entry_struct *new;
617 char p[MAX_ARGS][STRING_LENGTH];
618 char when[STRING_LENGTH], what[STRING_LENGTH];
619 char name[STRING_LENGTH];
623 /* !!!! Only Uppercase Keywords in devsfd.conf */
624 const char *options[] = { "CLEAR_CONFIG", "INCLUDE", "OPTIONAL_INCLUDE", "RESTORE",
625 "PERMISSIONS", "MODLOAD", "EXECUTE", "COPY", "IGNORE",
626 "MKOLDCOMPAT", "MKNEWCOMPAT","RMOLDCOMPAT", "RMNEWCOMPAT", 0 };
631 msg_logger( NO_DIE, LOG_INFO, "process_config_line()\n");
634 for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0';
635 num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s",
637 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
639 i = compare_string_array(options, when );
650 goto process_config_line_err;
652 /* "INCLUDE" & "OPTIONAL_INCLUDE" */
653 if( i == 1 || i == 2 )
655 st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL );
657 msg_logger( NO_DIE, LOG_INFO, "%sinclude: %s\n",(toupper (when[0]) == 'I') ? "": "optional_", name);
659 read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask);
665 dir_operation(RESTORE,name, strlen (name),NULL);
669 goto process_config_line_err;
671 new = xmalloc (sizeof *new);
672 memset (new, 0, sizeof *new);
674 for (count = 0; event_types[count].config_name != NULL; ++count)
676 if (strcasecmp (when, event_types[count].config_name) != 0)
678 new->action.when = event_types[count].type;
681 if (event_types[count].config_name == NULL)
684 goto process_config_line_err;
687 i = compare_string_array(options, what );
691 case 4: /* "PERMISSIONS" */
692 new->action.what = AC_PERMISSIONS;
693 /* Get user and group */
694 if ( ( ptr = strchr (p[0], '.') ) == NULL )
697 goto process_config_line_err; /*"missing '.' in UID.GID */
701 new->u.permissions.uid = get_uid_gid (UID, p[0]);
702 new->u.permissions.gid = get_uid_gid (GID, ptr);
704 new->u.permissions.mode = get_mode (p[1]);
706 #ifdef CONFIG_DEVFSD_MODLOAD
707 case 5: /* MODLOAD */
708 /*This action will pass "/dev/$devname" (i.e. "/dev/" prefixed to
709 the device name) to the module loading facility. In addition,
710 the /etc/modules.devfs configuration file is used.*/
711 new->action.what = AC_MODLOAD;
714 case 6: /* EXECUTE */
715 new->action.what = AC_EXECUTE;
718 for (count = 0; count < num_args; ++count)
719 new->u.execute.argv[count] = bb_xstrdup (p[count]);
721 new->u.execute.argv[num_args] = NULL;
724 new->action.what = AC_COPY;
727 goto process_config_line_err; /* missing path and function in line */
729 new->u.copy.source = bb_xstrdup (p[0]);
730 new->u.copy.destination = bb_xstrdup (p[1]);
734 case 9: /* MKOLDCOMPAT */
736 case 10: /* MKNEWCOMPAT */
738 case 11:/* RMOLDCOMPAT */
740 case 12: /* RMNEWCOMPAT */
746 new->action.what = i - 2;
750 goto process_config_line_err;
754 xregcomp( &new->preg, name, REG_EXTENDED);
756 *event_mask |= 1 << new->action.when;
758 if (first_config == NULL)
761 last_config->next = new;
764 process_config_line_err:
765 #ifdef CONFIG_DEVFSD_VERBOSE
766 msg_logger( DIE, LOG_ERR, bb_msg_bad_config, msg , line);
770 } /* End Function process_config_line */
772 static int do_servicing (int fd, unsigned long event_mask)
773 /* [SUMMARY] Service devfs changes until a signal is received.
774 <fd> The open control file.
775 <event_mask> The event mask.
776 [RETURNS] TRUE if SIGHUP was caught, else FALSE.
780 struct devfsd_notify_struct info;
781 unsigned long tmp_event_mask;
784 msg_logger( NO_DIE, LOG_INFO, "do_servicing()\n");
786 /* Tell devfs what events we care about */
787 tmp_event_mask = event_mask;
788 do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
789 while (!caught_signal)
792 bytes = read (fd, (char *) &info, sizeof info);
794 break; /* Must test for this first */
796 continue; /* Yes, the order is important */
799 service_name (&info);
803 int c_sighup = caught_sighup;
805 caught_signal = FALSE;
806 caught_sighup = FALSE;
809 #ifdef CONFIG_DEVFSD_VERBOSE
810 msg_logger( NO_DIE, LOG_ERR, "read error on control file: %m\n");
812 /* This is to shut up a compiler warning */
814 } /* End Function do_servicing */
816 static void service_name (const struct devfsd_notify_struct *info)
817 /* [SUMMARY] Service a single devfs change.
818 <info> The devfs change.
823 regmatch_t mbuf[MAX_SUBEXPR];
824 struct config_entry_struct *entry;
827 msg_logger( NO_DIE, LOG_INFO, "service_name()\n");
828 if (info->overrun_count > 0)
829 msg_logger( NO_DIE, LOG_ERR, "lost %u events\n", info->overrun_count);
832 /* Discard lookups on "/dev/log" and "/dev/initctl" */
833 if( info->type == DEVFSD_NOTIFY_LOOKUP &&
834 ((info->devname[0]=='l' && info->devname[1]=='o' &&
835 info->devname[2]=='g' && !info->devname[3]) ||
836 ( info->devname[0]=='i' && info->devname[1]=='n' &&
837 info->devname[2]=='i' && info->devname[3]=='t' &&
838 info->devname[4]=='c' && info->devname[5]=='t' &&
839 info->devname[6]=='l' && !info->devname[7])))
841 for (entry = first_config; entry != NULL; entry = entry->next)
843 /* First check if action matches the type, then check if name matches */
844 if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 )
846 for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
849 msg_logger( NO_DIE, LOG_INFO, "service_name(): action.what %d\n", entry->action.what);
851 switch (entry->action.what)
854 action_permissions (info, entry);
856 #ifdef CONFIG_DEVFSD_MODLOAD
858 action_modload (info, entry);
862 action_execute (info, entry, mbuf, n);
865 action_copy (info, entry, mbuf, n);
874 action_compat (info, entry->action.what);
877 #ifdef CONFIG_DEVFSD_VERBOSE
878 msg_logger( DIE, LOG_ERR, "Unknown action\n");
885 } /* End Function service_name */
887 static void action_permissions (const struct devfsd_notify_struct *info,
888 const struct config_entry_struct *entry)
889 /* [SUMMARY] Update permissions for a device entry.
890 <info> The devfs change.
891 <entry> The config file entry.
898 msg_logger( NO_DIE, LOG_INFO, "action_permission()\n");
901 if ( stat (info->devname, &statbuf) != 0 ||
902 chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 ||
903 chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0)
905 #ifdef CONFIG_DEVFSD_VERBOSE
906 msg_logger( NO_DIE, LOG_ERR, "chmod() or chown(): %s: %m\n",info->devname);
911 } /* End Function action_permissions */
913 #ifdef CONFIG_DEVFSD_MODLOAD
914 static void action_modload (const struct devfsd_notify_struct *info,
915 const struct config_entry_struct *entry)
916 /* [SUMMARY] Load a module.
917 <info> The devfs change.
918 <entry> The config file entry.
923 char device[STRING_LENGTH];
926 argv[1] = MODPROBE_SWITCH_1; /* "-k" */
927 argv[2] = MODPROBE_SWITCH_2; /* "-C" */
928 argv[3] = CONFIG_MODULES_DEVFS;
932 snprintf (device, sizeof (device), "/dev/%s", info->devname);
934 msg_logger( NO_DIE, LOG_INFO, "action_modload():%s %s %s %s %s\n",argv[0],argv[1],argv[2],argv[3],argv[4]);
936 fork_and_execute(DIE, argv[0], argv);
937 } /* End Function action_modload */
940 static void action_execute (const struct devfsd_notify_struct *info,
941 const struct config_entry_struct *entry,
942 const regmatch_t *regexpr, unsigned int numexpr)
943 /* [SUMMARY] Execute a programme.
944 <info> The devfs change.
945 <entry> The config file entry.
946 <regexpr> The number of subexpression (start, end) offsets within the
948 <numexpr> The number of elements within <<regexpr>>.
953 struct get_variable_info gv_info;
954 char *argv[MAX_ARGS + 1];
955 char largv[MAX_ARGS + 1][STRING_LENGTH];
963 gv_info.devname = info->devname;
964 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
965 for (count = 0; entry->u.execute.argv[count] != NULL; ++count)
967 expand_expression (largv[count], STRING_LENGTH,
968 entry->u.execute.argv[count],
969 get_variable, &gv_info,
970 gv_info.devname, regexpr, numexpr );
971 argv[count] = largv[count];
977 for(i=0;argv[i]!=NULL;i++) /* argv[i] < MAX_ARGS + 1 */
980 if( (strlen(buff)+ 1 + strlen(argv[i])) >= 512)
982 strcat(buff,argv[i]);
985 msg_logger( NO_DIE, LOG_INFO, "action_execute(): %s",buff);
988 fork_and_execute(NO_DIE, argv[0], argv);
989 } /* End Function action_execute */
992 static void action_copy (const struct devfsd_notify_struct *info,
993 const struct config_entry_struct *entry,
994 const regmatch_t *regexpr, unsigned int numexpr)
995 /* [SUMMARY] Copy permissions.
996 <info> The devfs change.
997 <entry> The config file entry.
998 <regexpr> This list of subexpression (start, end) offsets within the
1000 <numexpr> The number of elements in <<regexpr>>.
1005 struct get_variable_info gv_info;
1006 struct stat source_stat, dest_stat;
1007 char source[STRING_LENGTH], destination[STRING_LENGTH];
1008 dest_stat.st_mode = 0;
1011 msg_logger( NO_DIE, LOG_INFO, "action_copy()\n");
1014 if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) )
1016 gv_info.info = info;
1017 gv_info.devname = info->devname;
1019 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
1020 expand_expression (source, STRING_LENGTH, entry->u.copy.source,
1021 get_variable, &gv_info, gv_info.devname,
1024 expand_expression (destination, STRING_LENGTH, entry->u.copy.destination,
1025 get_variable, &gv_info, gv_info.devname,
1028 if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0)
1030 lstat (destination, &dest_stat);
1031 new_mode = source_stat.st_mode & ~S_ISVTX;
1032 if (info->type == DEVFSD_NOTIFY_CREATE)
1033 new_mode |= S_ISVTX;
1034 else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) )
1035 new_mode |= S_ISVTX;
1037 if ( !copy_inode (destination, &dest_stat, new_mode, source, &source_stat) && (errno != EEXIST))
1038 msg_logger( NO_DIE, LOG_ERR, "copy_inode(): %s to %s: %m\n", source, destination);
1040 copy_inode (destination, &dest_stat, new_mode, source, &source_stat);
1043 } /* End Function action_copy */
1045 static void action_compat (const struct devfsd_notify_struct *info, unsigned int action)
1046 /* [SUMMARY] Process a compatibility request.
1047 <info> The devfs change.
1048 <action> The action to take.
1052 const char *compat_name = NULL;
1053 const char *dest_name = info->devname;
1055 char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
1056 int mode, host, bus, target, lun;
1059 /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
1060 const char *fmt[] = { NULL ,
1061 "sg/c%db%dt%du%d", /* scsi/generic */
1062 "sd/c%db%dt%du%d", /* scsi/disc */
1063 "sr/c%db%dt%du%d", /* scsi/cd */
1064 "sd/c%db%dt%du%dp%d", /* scsi/part */
1065 "st/c%db%dt%du%dm%d%c", /* scsi/mt */
1066 "ide/hd/c%db%dt%du%d", /* ide/host/disc */
1067 "ide/cd/c%db%dt%du%d", /* ide/host/cd */
1068 "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
1069 "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
1072 /* First construct compatibility name */
1075 case AC_MKOLDCOMPAT:
1076 case AC_RMOLDCOMPAT:
1077 compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor);
1079 case AC_MKNEWCOMPAT:
1080 case AC_RMNEWCOMPAT:
1081 ptr = strrchr (info->devname, '/') + 1;
1082 i=scan_dev_name(info->devname, info->namelen, ptr);
1085 msg_logger( NO_DIE, LOG_INFO, "action_compat(): scan_dev_name() returned %d\n", i);
1092 sscanf (info->devname +((i<6)?5:4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
1093 snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + ((i>5)?4:0));
1094 dest_name = dest_buf;
1095 compat_name = compat_buf;
1098 /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
1099 if( i == 1 || i == 2 || i == 3 || i == 6 || i ==7 )
1100 sprintf ( compat_buf, fmt[i], host, bus, target, lun);
1102 /* 4 == scsi/part 8 == ide/host/part */
1103 if( i == 4 || i == 8)
1104 sprintf ( compat_buf, fmt[i], host, bus, target, lun, atoi (ptr + 4) );
1109 rewind_ = info->devname[info->namelen - 1];
1113 if(ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
1114 mode = ptr[2] - 107; /* 1 or 2 */
1117 sprintf (compat_buf, fmt [i], host, bus, target, lun, mode, rewind_);
1120 /* 9 == ide/host/mt */
1122 snprintf (compat_buf, sizeof (compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
1124 } /* switch(action) */
1126 if(compat_name == NULL )
1130 msg_logger( NO_DIE, LOG_INFO, "action_compat(): %s\n", compat_name);
1133 /* Now decide what to do with it */
1136 case AC_MKOLDCOMPAT:
1137 case AC_MKNEWCOMPAT:
1138 mksymlink (dest_name, compat_name);
1140 case AC_RMOLDCOMPAT:
1141 case AC_RMNEWCOMPAT:
1143 if (unlink (compat_name) != 0)
1144 msg_logger( NO_DIE, LOG_ERR, "unlink(): %s: %m\n", compat_name);
1146 unlink (compat_name);
1150 } /* switch(action) */
1151 } /* End Function action_compat */
1153 static void restore(char *spath, struct stat source_stat, int rootlen)
1155 char dpath[STRING_LENGTH];
1156 struct stat dest_stat;
1159 msg_logger( NO_DIE, LOG_INFO, "restore()\n");
1162 dest_stat.st_mode = 0;
1163 snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen);
1164 lstat (dpath, &dest_stat);
1166 if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) )
1167 copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
1169 if ( S_ISDIR (source_stat.st_mode) )
1170 dir_operation(RESTORE, spath, rootlen,NULL);
1174 static int copy_inode (const char *destpath, const struct stat *dest_stat,
1176 const char *sourcepath, const struct stat *source_stat)
1177 /* [SUMMARY] Copy an inode.
1178 <destpath> The destination path. An existing inode may be deleted.
1179 <dest_stat> The destination stat(2) information.
1180 <new_mode> The desired new mode for the destination.
1181 <sourcepath> The source path.
1182 <source_stat> The source stat(2) information.
1183 [RETURNS] TRUE on success, else FALSE.
1186 int source_len, dest_len;
1187 char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
1189 struct sockaddr_un un_addr;
1190 char symlink_val[STRING_LENGTH];
1193 msg_logger( NO_DIE, LOG_INFO, "copy_inode()\n");
1196 if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) )
1199 if ( S_ISLNK (source_stat->st_mode) )
1201 if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 ||
1202 ( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 )
1204 source_link[source_len] = '\0';
1205 dest_link[dest_len] = '\0';
1206 if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) )
1209 symlink (source_link, destpath);
1212 } /* Else not a symlink */
1213 chmod (destpath, new_mode & ~S_IFMT);
1214 chown (destpath, source_stat->st_uid, source_stat->st_gid);
1217 /* Different types: unlink and create */
1219 switch (source_stat->st_mode & S_IFMT)
1222 if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 )
1224 un_addr.sun_family = AF_UNIX;
1225 snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath);
1226 val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr);
1228 if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0)
1232 if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 )
1234 symlink_val[val] = '\0';
1235 if (symlink (symlink_val, destpath) == 0)
1239 if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 )
1242 if (chmod (destpath, new_mode & ~S_IFMT) != 0)
1248 if (mknod (destpath, new_mode, source_stat->st_rdev) != 0)
1252 if (mkdir (destpath, new_mode & ~S_IFMT) != 0)
1255 if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
1260 } /* End Function copy_inode */
1262 static void free_config ()
1263 /* [SUMMARY] Free the configuration information.
1267 struct config_entry_struct *c_entry;
1271 msg_logger( NO_DIE, LOG_INFO, "free_config()\n");
1274 for (c_entry = first_config; c_entry != NULL; c_entry = next)
1278 next = c_entry->next;
1279 regfree (&c_entry->preg);
1280 if (c_entry->action.what == AC_EXECUTE)
1282 for (count = 0; count < MAX_ARGS; ++count)
1284 if (c_entry->u.execute.argv[count] == NULL)
1286 free (c_entry->u.execute.argv[count]);
1291 first_config = NULL;
1293 } /* End Function free_config */
1295 static int get_uid_gid (int flag, const char *string)
1296 /* [SUMMARY] Convert a string to a UID or GID value.
1297 <flag> "UID" or "GID".
1298 <string> The string.
1299 [RETURNS] The UID or GID value.
1302 struct passwd *pw_ent;
1303 struct group *grp_ent;
1304 #ifdef CONFIG_DEVFSD_VERBOSE
1309 msg_logger( NO_DIE, LOG_INFO, "get_uid_gid()\n");
1312 if(flag != UID && flag != GID )
1313 msg_logger( DIE, LOG_ERR,"get_uid_gid(): flag != UID && flag != GID\n");
1316 if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) )
1317 return atoi (string);
1319 if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL )
1320 return (pw_ent->pw_uid);
1322 if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL )
1323 return (grp_ent->gr_gid);
1324 #ifdef CONFIG_DEVFSD_VERBOSE
1328 msg_logger( NO_DIE, LOG_ERR,"unknown %s: %s, defaulting to %cID=0\n", msg, string, msg[0] - 32);
1331 }/* End Function get_uid_gid */
1333 static mode_t get_mode (const char *string)
1334 /* [SUMMARY] Convert a string to a mode value.
1335 <string> The string.
1336 [RETURNS] The mode value.
1342 msg_logger( NO_DIE, LOG_INFO, "get_mode()\n");
1345 if ( isdigit (string[0]) )
1346 return strtoul (string, NULL, 8);
1347 if (strlen (string) != 9)
1348 #ifdef CONFIG_DEVFSD_VERBOSE
1349 msg_logger( DIE, LOG_ERR, "bad mode: %s\n", string);
1357 if(string[0]=='r'||string[0]=='w'||string[0]=='x')
1363 } /* End Function get_mode */
1365 static void signal_handler (int sig)
1368 msg_logger( NO_DIE, LOG_INFO, "signal_handler()\n");
1371 caught_signal = TRUE;
1373 caught_sighup = TRUE;
1374 #ifdef CONFIG_DEVFSD_VERBOSE
1375 msg_logger( NO_DIE, LOG_INFO, "Caught %s\n",(sig == SIGHUP)?"SIGHUP" : "SIGUSR1");
1377 } /* End Function signal_handler */
1379 static const char *get_variable (const char *variable, void *info)
1381 struct get_variable_info *gv_info = info;
1382 static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH];
1383 const char *field_names[] = { "hostname", "mntpt", "devpath", "devname",
1384 "uid", "gid", "mode", hostname, mount_point,
1385 gv_info->devpath, gv_info->devname, 0 };
1388 msg_logger( NO_DIE, LOG_INFO, "get_variable()\n");
1391 if (gethostname (hostname, STRING_LENGTH - 1) != 0)
1392 #ifdef CONFIG_DEVFSD_VERBOSE
1393 msg_logger( DIE, LOG_ERR, "gethostname(): %m\n");
1397 /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
1398 hostname[STRING_LENGTH - 1] = '\0';
1400 /* compare_string_array returns i>=0 */
1401 i=compare_string_array(field_names, variable);
1403 if ( i > 6 && (i > 1 && gv_info == NULL))
1405 if( i >= 0 || i <= 3)
1408 msg_logger( NO_DIE, LOG_INFO, "get_variable(): i=%d %s\n",i ,field_names[i+7]);
1410 return(field_names[i+7]);
1414 sprintf (sbuf, "%u", gv_info->info->uid);
1416 sprintf (sbuf, "%u", gv_info->info->gid);
1418 sprintf (sbuf, "%o", gv_info->info->mode);
1420 msg_logger( NO_DIE, LOG_INFO, "get_variable(): %s\n", sbuf);
1423 } /* End Function get_variable */
1425 static void service(struct stat statbuf, char *path)
1427 struct devfsd_notify_struct info;
1430 msg_logger( NO_DIE, LOG_INFO, "service()\n");
1433 memset (&info, 0, sizeof info);
1434 info.type = DEVFSD_NOTIFY_REGISTERED;
1435 info.mode = statbuf.st_mode;
1436 info.major = major (statbuf.st_rdev);
1437 info.minor = minor (statbuf.st_rdev);
1438 info.uid = statbuf.st_uid;
1439 info.gid = statbuf.st_gid;
1440 snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1);
1441 info.namelen = strlen (info.devname);
1442 service_name (&info);
1443 if ( S_ISDIR (statbuf.st_mode) )
1444 dir_operation(SERVICE,path,0,NULL);
1447 static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
1448 /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
1449 <flag> To choose which function to perform
1450 <dp> The directory pointer. This is closed upon completion.
1451 <dir_name> The name of the directory.
1452 <rootlen> string length parameter.
1456 struct stat statbuf;
1459 char path[STRING_LENGTH];
1463 msg_logger( NO_DIE, LOG_INFO, "dir_operation()\n");
1466 if((dp = opendir( dir_name))==NULL)
1469 msg_logger( NO_DIE, LOG_ERR, "opendir(): %s: %m\n", dir_name);
1474 while ( (de = readdir (dp) ) != NULL )
1477 if(de->d_name && *de->d_name == '.' && (!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2])))
1479 snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name);
1481 msg_logger( NO_DIE, LOG_ERR, "dir_operation(): %s\n", path);
1484 if (lstat (path, &statbuf) != 0)
1487 msg_logger( NO_DIE, LOG_ERR, "%s: %m\n", path);
1494 service(statbuf,path);
1497 restore(path, statbuf, var);
1500 read_config_file (path, var, event_mask);
1505 } /* End Function do_scan_and_service */
1507 static int mksymlink (const char *oldpath, const char *newpath)
1508 /* [SUMMARY] Create a symlink, creating intervening directories as required.
1509 <oldpath> The string contained in the symlink.
1510 <newpath> The name of the new symlink.
1511 [RETURNS] 0 on success, else -1.
1515 msg_logger( NO_DIE, LOG_INFO, "mksymlink()\n", newpath);
1519 if ( !make_dir_tree (newpath) )
1522 if (symlink (oldpath, newpath) != 0)
1524 if (errno != EEXIST)
1527 msg_logger( NO_DIE, LOG_ERR, "mksymlink(): %s to %s: %m\n", oldpath, newpath);
1533 } /* End Function mksymlink */
1536 static int make_dir_tree (const char *path)
1537 /* [SUMMARY] Creating intervening directories for a path as required.
1538 <path> The full pathname (including the leaf node).
1539 [RETURNS] TRUE on success, else FALSE.
1543 msg_logger( NO_DIE, LOG_INFO, "make_dir_tree()\n");
1545 if (bb_make_directory( dirname((char *)path), -1, FILEUTILS_RECUR )==-1)
1548 msg_logger( NO_DIE, LOG_ERR, "make_dir_tree(): %s: %m\n", path);
1553 } /* End Function make_dir_tree */
1555 static int expand_expression(char *output, unsigned int outsize,
1557 const char *(*get_variable_func)(const char *variable, void *info),
1559 const char *devname,
1560 const regmatch_t *ex, unsigned int numexp)
1561 /* [SUMMARY] Expand environment variables and regular subexpressions in string.
1562 <output> The output expanded expression is written here.
1563 <length> The size of the output buffer.
1564 <input> The input expression. This may equal <<output>>.
1565 <get_variable> A function which will be used to get variable values. If
1566 this returns NULL, the environment is searched instead. If this is NULL,
1567 only the environment is searched.
1568 <info> An arbitrary pointer passed to <<get_variable>>.
1569 <devname> Device name; specifically, this is the string that contains all
1570 of the regular subexpressions.
1571 <ex> Array of start / end offsets into info->devname for each subexpression
1572 <numexp> Number of regular subexpressions found in <<devname>>.
1573 [RETURNS] TRUE on success, else FALSE.
1576 char temp[STRING_LENGTH];
1579 msg_logger( NO_DIE, LOG_INFO, "expand_expression()\n");
1582 if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) )
1584 expand_regexp (output, outsize, temp, devname, ex, numexp);
1586 } /* End Function expand_expression */
1588 static void expand_regexp (char *output, size_t outsize, const char *input,
1589 const char *devname,
1590 const regmatch_t *ex, unsigned int numex )
1591 /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
1592 <output> The output expanded expression is written here.
1593 <outsize> The size of the output buffer.
1594 <input> The input expression. This may NOT equal <<output>>, because
1595 supporting that would require yet another string-copy. However, it's not
1596 hard to write a simple wrapper function to add this functionality for those
1597 few cases that need it.
1598 <devname> Device name; specifically, this is the string that contains all
1599 of the regular subexpressions.
1600 <ex> An array of start and end offsets into <<devname>>, one for each
1602 <numex> Number of subexpressions in the offset-array <<ex>>.
1606 const char last_exp = '0' - 1 + numex;
1610 msg_logger( NO_DIE, LOG_INFO, "expand_regexp()\n");
1613 /* Guarantee NULL termination by writing an explicit '\0' character into
1614 the very last byte */
1616 output[--outsize] = '\0';
1617 /* Copy the input string into the output buffer, replacing '\\' with '\'
1618 and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
1619 codes are deleted */
1620 while ( (c != '\0') && (outsize != 0) )
1630 if ((c >= '0') && (c <= last_exp))
1632 const regmatch_t *subexp = ex + (c - '0');
1633 unsigned int sublen = subexp->rm_eo - subexp->rm_so;
1635 /* Range checking */
1636 if (sublen > outsize)
1638 strncpy (output, devname + subexp->rm_so, sublen);
1649 } /* End Function expand_regexp */
1652 /* from compat_name.c */
1654 struct translate_struct
1656 char *match; /* The string to match to (up to length) */
1657 char *format; /* Format of output, "%s" takes data past match string,
1658 NULL is effectively "%s" (just more efficient) */
1661 static struct translate_struct translate_table[] =
1664 {"printers/", "lp%s"},
1666 {"parports/", "parport%s"},
1669 {"loop/", "loop%s"},
1670 {"floppy/", "fd%s"},
1672 {"md/", "md%s"}, /* Meta-devices */
1676 {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
1678 {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
1679 {"tts/E", "ttyE%s"}, /* Stallion serial driver */
1680 {"cua/E", "cue%s"}, /* Stallion serial driver callout */
1681 {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
1682 {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
1683 {"ip2/", "ip2%s"}, /* Computone serial driver control */
1684 {"tts/F", "ttyF%s"}, /* Computone serial driver */
1685 {"cua/F", "cuf%s"}, /* Computone serial driver callout */
1686 {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
1687 {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
1688 {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
1689 {"cua/", "cua%s"}, /* Generic serial: must be after others */
1690 {"input/js", "js%s"}, /* Joystick driver */
1694 const char *get_old_name (const char *devname, unsigned int namelen,
1695 char *buffer, unsigned int major, unsigned int minor)
1696 /* [SUMMARY] Translate a kernel-supplied name into an old name.
1697 <devname> The device name provided by the kernel.
1698 <namelen> The length of the name.
1699 <buffer> A buffer that may be used. This should be at least 128 bytes long.
1700 <major> The major number for the device.
1701 <minor> The minor number for the device.
1702 [RETURNS] A pointer to the old name if known, else NULL.
1705 const char *compat_name = NULL;
1707 struct translate_struct *trans;
1714 /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
1715 const char *fmt[] = { NULL ,
1716 "sg%u", /* scsi/generic */
1717 NULL, /* scsi/disc */
1718 "sr%u", /* scsi/cd */
1719 NULL, /* scsi/part */
1720 "nst%u%c", /* scsi/mt */
1721 "hd%c" , /* ide/host/disc */
1722 "hd%c" , /* ide/host/cd */
1723 "hd%c%s", /* ide/host/part */
1724 "%sht%d", /* ide/host/mt */
1725 "sbpcd%u", /* sbp/ */
1727 "%cty%c%c", /* pty/ */
1731 msg_logger( NO_DIE, LOG_INFO, "get_old_name()\n");
1734 for (trans = translate_table; trans->match != NULL; ++trans)
1736 len = strlen (trans->match);
1738 if (strncmp (devname, trans->match, len) == 0)
1740 if (trans->format == NULL)
1741 return (devname + len);
1742 sprintf (buffer, trans->format, devname + len);
1747 ptr = (strrchr (devname, '/') + 1);
1748 i = scan_dev_name(devname, namelen, ptr);
1750 if( i > 0 && i < 13)
1751 compat_name = buffer;
1756 msg_logger( NO_DIE, LOG_INFO, "get_old_name(): scan_dev_name() returned %d\n", i);
1759 /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
1760 if( i == 1 || i == 3 || i == 10 )
1761 sprintf (buffer, fmt[i], minor);
1763 /* 2 ==scsi/disc, 4 == scsi/part */
1764 if( i == 2 || i == 4)
1765 compat_name = write_old_sd_name (buffer, major, minor,((i == 2)?"":(ptr + 4)));
1773 sprintf (buffer, fmt[i], minor & 0x1f, mode);
1774 if (devname[namelen - 1] != 'n')
1777 /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
1778 if( i == 6 || i == 7 || i == 8 )
1779 sprintf (buffer, fmt[i] , get_old_ide_name (major, minor), ptr + 4); /* last arg should be ignored for i == 6 or i== 7 */
1781 /* 9 == ide/host/mt */
1783 sprintf (buffer, fmt[i], ptr + 2, minor & 0x7f);
1788 sprintf (buffer, fmt[i], devname + 4);
1789 if (buffer[3] == '0')
1795 pty1 = "pqrstuvwxyzabcde";
1796 pty2 = "0123456789abcdef";
1797 indexx = atoi (devname + 5);
1798 sprintf (buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
1801 if(compat_name!=NULL)
1802 msg_logger( NO_DIE, LOG_INFO, "get_old_name(): compat_name %s\n", compat_name);
1804 return (compat_name);
1805 } /* End Function get_old_name */
1807 static char get_old_ide_name (unsigned int major, unsigned int minor)
1808 /* [SUMMARY] Get the old IDE name for a device.
1809 <major> The major number for the device.
1810 <minor> The minor number for the device.
1811 [RETURNS] The drive letter.
1814 char letter='y'; /* 121 */
1815 char c='a'; /* 97 */
1819 msg_logger( NO_DIE, LOG_INFO, "get_old_ide_name()\n");
1822 /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
1824 if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR ||
1825 i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR ||
1826 i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR ||
1837 } while(i<=IDE9_MAJOR);
1842 } /* End Function get_old_ide_name */
1844 static char *write_old_sd_name (char *buffer,
1845 unsigned int major, unsigned int minor,
1847 /* [SUMMARY] Write the old SCSI disc name to a buffer.
1848 <buffer> The buffer to write to.
1849 <major> The major number for the device.
1850 <minor> The minor number for the device.
1851 <part> The partition string. Must be "" for a whole-disc entry.
1852 [RETURNS] A pointer to the buffer on success, else NULL.
1855 unsigned int disc_index;
1858 msg_logger( NO_DIE, LOG_INFO, "write_old_sd_name()\n");
1863 sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part);
1866 if ( (major > 64) && (major < 72) )
1868 disc_index = ( (major - 64) << 4 ) + (minor >> 4);
1869 if (disc_index < 26)
1870 sprintf (buffer, "sd%c%s", 'a' + disc_index, part);
1872 sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part);
1876 } /* End Function write_old_sd_name */
1881 /*EXPERIMENTAL_FUNCTION*/
1883 int st_expr_expand (char *output, unsigned int length, const char *input,
1884 const char *(*get_variable_func) (const char *variable,
1887 /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
1888 <output> The output expanded expression is written here.
1889 <length> The size of the output buffer.
1890 <input> The input expression. This may equal <<output>>.
1891 <get_variable> A function which will be used to get variable values. If
1892 this returns NULL, the environment is searched instead. If this is NULL,
1893 only the environment is searched.
1894 <info> An arbitrary pointer passed to <<get_variable>>.
1895 [RETURNS] TRUE on success, else FALSE.
1900 unsigned int out_pos = 0;
1903 struct passwd *pwent;
1904 char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
1907 msg_logger( NO_DIE, LOG_INFO, "st_expr_expand()\n");
1910 if (length > BUFFER_SIZE)
1911 length = BUFFER_SIZE;
1912 for (; TRUE; ++input)
1914 switch (ch = *input)
1917 /* Variable expansion */
1918 input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info);
1923 /* Home directory expansion */
1925 if ( isspace (ch) || (ch == '/') || (ch == '\0') )
1927 /* User's own home directory: leave separator for next time */
1928 if ( ( env = getenv ("HOME") ) == NULL )
1930 #ifdef CONFIG_DEVFSD_VERBOSE
1931 msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, "HOME");
1936 if (len + out_pos >= length)
1937 goto st_expr_expand_out;
1938 memcpy (buffer + out_pos, env, len + 1);
1942 /* Someone else's home directory */
1943 for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
1946 if (len >= sizeof tmp)
1947 goto st_expr_expand_out;
1948 safe_memcpy (tmp, input, len);
1950 if ( ( pwent = getpwnam (tmp) ) == NULL )
1952 #ifdef CONFIG_DEVFSD_VERBOSE
1953 msg_logger( NO_DIE, LOG_INFO, "no pwent for: %s\n", tmp);
1957 len = strlen (pwent->pw_dir);
1958 if (len + out_pos >= length)
1959 goto st_expr_expand_out;
1960 memcpy (buffer + out_pos, pwent->pw_dir, len + 1);
1966 if (out_pos >= length)
1967 goto st_expr_expand_out;
1968 buffer[out_pos++] = ch;
1971 memcpy (output, buffer, out_pos);
1980 #ifdef CONFIG_DEVFSD_VERBOSE
1981 msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer);
1984 } /* End Function st_expr_expand */
1987 /* Private functions follow */
1989 static const char *expand_variable (char *buffer, unsigned int length,
1990 unsigned int *out_pos, const char *input,
1991 const char *(*func) (const char *variable,
1994 /* [SUMMARY] Expand a variable.
1995 <buffer> The buffer to write to.
1996 <length> The length of the output buffer.
1997 <out_pos> The current output position. This is updated.
1998 <input> A pointer to the input character pointer.
1999 <func> A function which will be used to get variable values. If this
2000 returns NULL, the environment is searched instead. If this is NULL, only
2001 the environment is searched.
2002 <info> An arbitrary pointer passed to <<func>>.
2003 <errfp> Diagnostic messages are written here.
2004 [RETURNS] A pointer to the end of this subexpression on success, else NULL.
2009 unsigned int open_braces;
2010 const char *env, *ptr;
2011 char tmp[STRING_LENGTH];
2014 msg_logger( NO_DIE, LOG_INFO, "expand_variable()\n");
2020 /* Special case for "$$": PID */
2021 sprintf ( tmp, "%d", (int) getpid () );
2023 if (len + *out_pos >= length)
2024 goto expand_variable_out;
2026 memcpy (buffer + *out_pos, tmp, len + 1);
2030 /* Ordinary variable expansion, possibly in braces */
2033 /* Simple variable expansion */
2034 for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr)
2037 if (len >= sizeof tmp)
2038 goto expand_variable_out;
2040 safe_memcpy (tmp, input, len);
2042 if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL )
2044 #ifdef CONFIG_DEVFSD_VERBOSE
2045 msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, tmp);
2050 if (len + *out_pos >= length)
2051 goto expand_variable_out;
2053 memcpy (buffer + *out_pos, env, len + 1);
2057 /* Variable in braces: check for ':' tricks */
2059 for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr)
2063 /* Must be simple variable expansion with "${var}" */
2065 if (len >= sizeof tmp)
2066 goto expand_variable_out;
2068 safe_memcpy (tmp, input, len);
2069 ptr = expand_variable (buffer, length, out_pos, tmp, func, info );
2072 return (input + len);
2074 if (ch != ':' || ptr[1] != '-' )
2076 #ifdef CONFIG_DEVFSD_VERBOSE
2077 msg_logger( NO_DIE, LOG_INFO,"illegal char in var name\n");
2081 /* It's that handy "${var:-word}" expression. Check if var is defined */
2083 if (len >= sizeof tmp)
2084 goto expand_variable_out;
2086 safe_memcpy (tmp, input, len);
2087 /* Move input pointer to ':' */
2089 /* First skip to closing brace, taking note of nested expressions */
2092 for (open_braces = 1; open_braces > 0; ch = *++ptr)
2103 #ifdef CONFIG_DEVFSD_VERBOSE
2104 msg_logger( NO_DIE, LOG_INFO,"\"}\" not found in: %s\n", input);
2112 /* At this point ptr should point to closing brace of "${var:-word}" */
2113 if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL )
2115 /* Found environment variable, so skip the input to the closing brace
2116 and return the variable */
2119 if (len + *out_pos >= length)
2120 goto expand_variable_out;
2122 memcpy (buffer + *out_pos, env, len + 1);
2126 /* Environment variable was not found, so process word. Advance input
2127 pointer to start of word in "${var:-word}" */
2130 if (len >= sizeof tmp)
2131 goto expand_variable_out;
2133 safe_memcpy (tmp, input, len);
2135 if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) )
2138 if (len + *out_pos >= length)
2139 goto expand_variable_out;
2141 memcpy (buffer + *out_pos, tmp, len + 1);
2144 expand_variable_out:
2145 #ifdef CONFIG_DEVFSD_VERBOSE
2146 msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer);
2149 } /* End Function expand_variable */
2152 static const char *get_variable_v2 (const char *variable,
2153 const char *(*func) (const char *variable, void *info),
2155 /* [SUMMARY] Get a variable from the environment or .
2156 <variable> The variable name.
2157 <func> A function which will be used to get the variable. If this returns
2158 NULL, the environment is searched instead. If this is NULL, only the
2159 environment is searched.
2160 [RETURNS] The value of the variable on success, else NULL.
2166 msg_logger( NO_DIE, LOG_INFO, "get_variable_v2()\n");
2171 value = (*func) (variable, info);
2175 return getenv (variable);
2176 } /* End Function get_variable */