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1/* vi: set sw=4 ts=4: */
2/*
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4 */
5
6/*
7 devfsd implementation for busybox
8
9 Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
10
11 Busybox version is based on some previous work and ideas
12 Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it>
13
14 devfsd.c
15
16 Main file for devfsd (devfs daemon for Linux).
17
18 Copyright (C) 1998-2002 Richard Gooch
19
20 devfsd.h
21
22 Header file for devfsd (devfs daemon for Linux).
23
24 Copyright (C) 1998-2000 Richard Gooch
25
26 compat_name.c
27
28 Compatibility name file for devfsd (build compatibility names).
29
30 Copyright (C) 1998-2002 Richard Gooch
31
32 expression.c
33
34 This code provides Borne Shell-like expression expansion.
35
36 Copyright (C) 1997-1999 Richard Gooch
37
38 This program is free software; you can redistribute it and/or modify
39 it under the terms of the GNU General Public License as published by
40 the Free Software Foundation; either version 2 of the License, or
41 (at your option) any later version.
42
43 This program is distributed in the hope that it will be useful,
44 but WITHOUT ANY WARRANTY; without even the implied warranty of
45 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
46 GNU General Public License for more details.
47
48 You should have received a copy of the GNU General Public License
49 along with this program; if not, write to the Free Software
50 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
51
52 Richard Gooch may be reached by email at rgooch@atnf.csiro.au
53 The postal address is:
54 Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
55*/
56
57#include "busybox.h"
58#include "xregex.h"
59#include <unistd.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <stdarg.h>
63#include <string.h>
64#include <ctype.h>
65#include <sys/stat.h>
66#include <sys/types.h>
67#include <sys/wait.h>
68#include <sys/ioctl.h>
69#include <sys/socket.h>
70#include <sys/un.h>
71#include <dirent.h>
72#include <fcntl.h>
73#include <syslog.h>
74#include <signal.h>
75#include <errno.h>
76#include <sys/sysmacros.h>
77
78
79/* Various defines taken from linux/major.h */
80#define IDE0_MAJOR 3
81#define IDE1_MAJOR 22
82#define IDE2_MAJOR 33
83#define IDE3_MAJOR 34
84#define IDE4_MAJOR 56
85#define IDE5_MAJOR 57
86#define IDE6_MAJOR 88
87#define IDE7_MAJOR 89
88#define IDE8_MAJOR 90
89#define IDE9_MAJOR 91
90
91
92/* Various defines taken from linux/devfs_fs.h */
93#define DEVFSD_PROTOCOL_REVISION_KERNEL 5
94#define DEVFSD_IOCTL_BASE 'd'
95/* These are the various ioctls */
96#define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int)
97#define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int)
98#define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int)
99#define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int)
100#define DEVFSD_NOTIFY_REGISTERED 0
101#define DEVFSD_NOTIFY_UNREGISTERED 1
102#define DEVFSD_NOTIFY_ASYNC_OPEN 2
103#define DEVFSD_NOTIFY_CLOSE 3
104#define DEVFSD_NOTIFY_LOOKUP 4
105#define DEVFSD_NOTIFY_CHANGE 5
106#define DEVFSD_NOTIFY_CREATE 6
107#define DEVFSD_NOTIFY_DELETE 7
108#define DEVFS_PATHLEN 1024
109/* Never change this otherwise the binary interface will change */
110
111struct devfsd_notify_struct
112{ /* Use native C types to ensure same types in kernel and user space */
113 unsigned int type; /* DEVFSD_NOTIFY_* value */
114 unsigned int mode; /* Mode of the inode or device entry */
115 unsigned int major; /* Major number of device entry */
116 unsigned int minor; /* Minor number of device entry */
117 unsigned int uid; /* Uid of process, inode or device entry */
118 unsigned int gid; /* Gid of process, inode or device entry */
119 unsigned int overrun_count; /* Number of lost events */
120 unsigned int namelen; /* Number of characters not including '\0' */
121 /* The device name MUST come last */
122 char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */
123};
124
125#define BUFFER_SIZE 16384
126#define DEVFSD_VERSION "1.3.25"
127#define CONFIG_FILE "/etc/devfsd.conf"
128#define MODPROBE "/sbin/modprobe"
129#define MODPROBE_SWITCH_1 "-k"
130#define MODPROBE_SWITCH_2 "-C"
131#define CONFIG_MODULES_DEVFS "/etc/modules.devfs"
132#define MAX_ARGS (6 + 1)
133#define MAX_SUBEXPR 10
134#define STRING_LENGTH 255
135
136/* for get_uid_gid() */
137#define UID 0
138#define GID 1
139
140/* fork_and_execute() */
141# define DIE 1
142# define NO_DIE 0
143
144/* for dir_operation() */
145#define RESTORE 0
146#define SERVICE 1
147#define READ_CONFIG 2
148
149/* Update only after changing code to reflect new protocol */
150#define DEVFSD_PROTOCOL_REVISION_DAEMON 5
151
152/* Compile-time check */
153#if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
154#error protocol version mismatch. Update your kernel headers
155#endif
156
157#define AC_PERMISSIONS 0
158#define AC_MODLOAD 1
159#define AC_EXECUTE 2
160#define AC_MFUNCTION 3 /* not supported by busybox */
161#define AC_CFUNCTION 4 /* not supported by busybox */
162#define AC_COPY 5
163#define AC_IGNORE 6
164#define AC_MKOLDCOMPAT 7
165#define AC_MKNEWCOMPAT 8
166#define AC_RMOLDCOMPAT 9
167#define AC_RMNEWCOMPAT 10
168#define AC_RESTORE 11
169
170struct permissions_type
171{
172 mode_t mode;
173 uid_t uid;
174 gid_t gid;
175};
176
177struct execute_type
178{
179 char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
180};
181
182struct copy_type
183{
184 const char *source;
185 const char *destination;
186};
187
188struct action_type
189{
190 unsigned int what;
191 unsigned int when;
192};
193
194struct config_entry_struct
195{
196 struct action_type action;
197 regex_t preg;
198 union
199 {
200 struct permissions_type permissions;
201 struct execute_type execute;
202 struct copy_type copy;
203 }
204 u;
205 struct config_entry_struct *next;
206};
207
208struct get_variable_info
209{
210 const struct devfsd_notify_struct *info;
211 const char *devname;
212 char devpath[STRING_LENGTH];
213};
214
215static void dir_operation(int , const char * , int, unsigned long* );
216static void service(struct stat statbuf, char *path);
217static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *);
218static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
219static int mksymlink (const char *oldpath, const char *newpath);
220static void read_config_file (char *path, int optional, unsigned long *event_mask);
221static void process_config_line (const char *, unsigned long *);
222static int do_servicing (int, unsigned long);
223static void service_name (const struct devfsd_notify_struct *);
224static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *);
225static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *,
226 const regmatch_t *, unsigned);
227static void action_modload (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
228static void action_copy (const struct devfsd_notify_struct *, const struct config_entry_struct *,
229 const regmatch_t *, unsigned);
230static void action_compat (const struct devfsd_notify_struct *, unsigned);
231static void free_config (void);
232static void restore(char *spath, struct stat source_stat, int rootlen);
233static int copy_inode (const char *, const struct stat *, mode_t, const char *, const struct stat *);
234static mode_t get_mode (const char *);
235static void signal_handler (int);
236static const char *get_variable (const char *, void *);
237static int make_dir_tree (const char *);
238static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
239 const char *, const regmatch_t *, unsigned );
240static void expand_regexp (char *, size_t, const char *, const char *, const regmatch_t *, unsigned );
241static const char *expand_variable( char *, unsigned, unsigned *, const char *,
242 const char *(*) (const char *, void *), void * );
243static const char *get_variable_v2(const char *, const char *(*) (const char *, void *), void *);
244static char get_old_ide_name (unsigned , unsigned);
245static char *write_old_sd_name (char *, unsigned, unsigned, char *);
246
247/* busybox functions */
248static void msg_logger(int pri, const char * fmt, ... )__attribute__ ((format (printf, 2, 3)));
249static void msg_logger_and_die(int pri, const char * fmt, ... )__attribute__ ((noreturn, format (printf, 2, 3)));
250static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag);
251static void fork_and_execute(int die, char *arg0, char **arg );
252static int get_uid_gid ( int, const char *);
253static void safe_memcpy( char * dest, const char * src, int len);
254static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr);
255static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr);
256
257/* Structs and vars */
258static struct config_entry_struct *first_config = NULL;
259static struct config_entry_struct *last_config = NULL;
260static const char *mount_point = NULL;
261static volatile int caught_signal = FALSE;
262static volatile int caught_sighup = FALSE;
263static struct initial_symlink_struct
264{
265 char *dest;
266 char *name;
267} initial_symlinks[] =
268{
269 {"/proc/self/fd", "fd"},
270 {"fd/0", "stdin"},
271 {"fd/1", "stdout"},
272 {"fd/2", "stderr"},
273 {NULL, NULL},
274};
275
276static struct event_type
277{
278 unsigned int type; /* The DEVFSD_NOTIFY_* value */
279 const char *config_name; /* The name used in the config file */
280} event_types[] =
281{
282 {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
283 {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
284 {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
285 {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
286 {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
287 {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
288 {DEVFSD_NOTIFY_CREATE, "CREATE"},
289 {DEVFSD_NOTIFY_DELETE, "DELETE"},
290 {0xffffffff, NULL}
291};
292
293/* Busybox messages */
294
295static const char * const bb_msg_proto_rev = "protocol revision";
296static const char * const bb_msg_bad_config = "bad %s config file: %s";
297static const char * const bb_msg_small_buffer = "buffer too small";
298static const char * const bb_msg_variable_not_found = "variable: %s not found";
299
300/* Busybox functions */
301static void msg_logger(int pri, const char * fmt, ... )
302{
303 va_list ap;
304 int ret;
305
306 va_start(ap, fmt);
307 ret = access ("/dev/log", F_OK);
308 if (ret == 0) {
309 openlog(applet_name, 0, LOG_DAEMON);
310 vsyslog( pri , fmt, ap);
311 /* Man: A trailing newline is added when needed. */
312 closelog();
313 }
314 /* ENABLE_DEVFSD_VERBOSE is always enabled if msg_logger is used */
315 if ((ENABLE_DEVFSD_VERBOSE && ret) || ENABLE_DEBUG) {
316 bb_error_msg(fmt, ap);
317 }
318 va_end(ap);
319}
320
321static void msg_logger_and_die(int pri, const char* fmt, ...)
322{
323 va_list ap;
324
325 va_start(ap, fmt);
326 msg_logger(pri, fmt, ap);
327 va_end(ap);
328 exit(EXIT_FAILURE);
329}
330
331/* Busybox stuff */
332#if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
333#define devfsd_error_msg(fmt, args...) bb_error_msg(fmt, ## args)
334#define devfsd_perror_msg_and_die(fmt, args...) bb_perror_msg_and_die(fmt, ## args)
335#define devfsd_error_msg_and_die(fmt, args...) bb_error_msg_and_die(fmt, ## args)
336#if defined(CONFIG_DEBUG)
337#define debug_msg_logger(x, fmt, args...) msg_logger(x, fmt, ## args)
338#else
339#define debug_msg_logger(x, fmt, args...)
340#endif
341#else
342#define debug_msg_logger(x, fmt, args...)
343#define msg_logger(p, fmt, args...)
344#define msg_logger_and_die(p, fmt, args...) exit(1)
345#define devfsd_perror_msg_and_die(fmt, args...) exit(1)
346#define devfsd_error_msg_and_die(fmt, args...) exit(1)
347#define devfsd_error_msg(fmt, args...)
348#endif
349
350static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag)
351{
352 if (ioctl (fd, request, event_mask_flag) == -1)
353 msg_logger_and_die(LOG_ERR, "ioctl");
354}
355
356static void fork_and_execute(int die, char *arg0, char **arg )
357{
358 switch ( fork () )
359 {
360 case 0:
361 /* Child */
362 break;
363 case -1:
364 /* Parent: Error : die or return */
365 msg_logger(LOG_ERR,(char *) bb_msg_memory_exhausted);
366 if(die)
367 exit(EXIT_FAILURE);
368 return;
369 default:
370 /* Parent : ok : return or exit */
371 if(arg0 != NULL)
372 {
373 wait (NULL);
374 return;
375 }
376 exit (EXIT_SUCCESS);
377 }
378 /* Child : if arg0 != NULL do execvp */
379 if(arg0 != NULL )
380 {
381 execvp (arg0, arg);
382 msg_logger_and_die(LOG_ERR, "execvp");
383 }
384}
385
386static void safe_memcpy( char *dest, const char *src, int len)
387{
388 memcpy (dest , src , len );
389 dest[len] = '\0';
390}
391
392static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr)
393{
394 if(d[n - 4]=='d' && d[n - 3]=='i' && d[n - 2]=='s' && d[n - 1]=='c')
395 return 2 + addendum;
396 if(d[n - 2]=='c' && d[n - 1]=='d')
397 return 3 + addendum;
398 if(ptr[0]=='p' && ptr[1]=='a' && ptr[2]=='r' && ptr[3]=='t')
399 return 4 + addendum;
400 if(ptr[n - 2]=='m' && ptr[n - 1]=='t')
401 return 5 + addendum;
402 return 0;
403}
404
405static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr)
406{
407 if(d[0]=='s' && d[1]=='c' && d[2]=='s' && d[3]=='i' && d[4]=='/') {
408 if( d[n - 7]=='g' && d[n - 6]=='e' && d[n - 5]=='n' &&
409 d[n - 4]=='e' && d[n - 3]=='r' && d[n - 2]=='i' &&
410 d[n - 1]=='c' )
411 return 1;
412 return scan_dev_name_common(d, n, 0, ptr);
413 }
414 if(d[0]=='i' && d[1]=='d' && d[2]=='e' && d[3]=='/' &&
415 d[4]=='h' && d[5]=='o' && d[6]=='s' && d[7]=='t')
416 return scan_dev_name_common(d, n, 4, ptr);
417 if(d[0]=='s' && d[1]=='b' && d[2]=='p' && d[3]=='/')
418 return 10;
419 if(d[0]=='v' && d[1]=='c' && d[2]=='c' && d[3]=='/')
420 return 11;
421 if(d[0]=='p' && d[1]=='t' && d[2]=='y' && d[3]=='/')
422 return 12;
423 return 0;
424}
425
426/* Public functions follow */
427
428int devfsd_main (int argc, char **argv)
429{
430 int print_version = FALSE;
431 int do_daemon = TRUE;
432 int no_polling = FALSE;
433 int do_scan;
434 int fd, proto_rev, count;
435 unsigned long event_mask = 0;
436 struct sigaction new_action;
437 struct initial_symlink_struct *curr;
438
439 if (argc < 2)
440 bb_show_usage();
441
442 for (count = 2; count < argc; ++count)
443 {
444 if(argv[count][0] == '-')
445 {
446 if(argv[count][1]=='v' && !argv[count][2]) /* -v */
447 print_version = TRUE;
448 else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='f'
449 && argv[count][2]=='g' && !argv[count][3]) /* -fg */
450 do_daemon = FALSE;
451 else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='n'
452 && argv[count][2]=='p' && !argv[count][3]) /* -np */
453 no_polling = TRUE;
454 else
455 bb_show_usage();
456 }
457 }
458
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';
462
463 mount_point = argv[1];
464
465 if (chdir (mount_point) != 0)
466 devfsd_perror_msg_and_die(mount_point);
467
468 fd = xopen (".devfsd", O_RDONLY);
469
470 if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0)
471 devfsd_perror_msg_and_die("FD_CLOEXEC");
472
473 if (ioctl (fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev) == -1)
474 msg_logger_and_die(LOG_ERR, "ioctl");
475
476 /*setup initial entries */
477 for (curr = initial_symlinks; curr->dest != NULL; ++curr)
478 symlink (curr->dest, curr->name);
479
480 /* NB: The check for CONFIG_FILE is done in read_config_file() */
481
482 if ( print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) )
483 {
484 printf( "%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
485 applet_name,DEVFSD_VERSION,bb_msg_proto_rev,
486 DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev);
487 if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
488 bb_error_msg_and_die( "%s mismatch!",bb_msg_proto_rev);
489 exit(EXIT_SUCCESS); /* -v */
490 }
491 /* Tell kernel we are special (i.e. we get to see hidden entries) */
492 do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
493
494 sigemptyset (&new_action.sa_mask);
495 new_action.sa_flags = 0;
496
497 /* Set up SIGHUP and SIGUSR1 handlers */
498 new_action.sa_handler = signal_handler;
499 if (sigaction (SIGHUP, &new_action, NULL) != 0 || sigaction (SIGUSR1, &new_action, NULL) != 0 )
500 devfsd_error_msg_and_die( "sigaction");
501
502 printf("%s v%s started for %s\n",applet_name, DEVFSD_VERSION, mount_point);
503
504 /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
505 umask (0);
506 read_config_file (CONFIG_FILE, FALSE, &event_mask);
507 /* Do the scan before forking, so that boot scripts see the finished product */
508 dir_operation(SERVICE,mount_point,0,NULL);
509
510 if (ENABLE_DEVFSD_FG_NP && no_polling)
511 exit (0);
512 if (do_daemon)
513 {
514 /* Release so that the child can grab it */
515 do_ioctl_and_die(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
516 fork_and_execute(DIE, NULL, NULL);
517 setsid (); /* Prevent hangups and become pgrp leader */
518 } else if(ENABLE_DEVFSD_FG_NP) {
519 setpgid (0, 0); /* Become process group leader */
520 }
521
522 while (TRUE)
523 {
524 do_scan = do_servicing (fd, event_mask);
525
526 free_config ();
527 read_config_file (CONFIG_FILE, FALSE, &event_mask);
528 if (do_scan)
529 dir_operation(SERVICE,mount_point,0,NULL);
530 }
531} /* End Function main */
532
533
534/* Private functions follow */
535
536static void read_config_file (char *path, int optional, unsigned long *event_mask)
537/* [SUMMARY] Read a configuration database.
538 <path> The path to read the database from. If this is a directory, all
539 entries in that directory will be read (except hidden entries).
540 <optional> If TRUE, the routine will silently ignore a missing config file.
541 <event_mask> The event mask is written here. This is not initialised.
542 [RETURNS] Nothing.
543*/
544{
545 struct stat statbuf;
546 FILE *fp;
547 char buf[STRING_LENGTH];
548 char *line=NULL;
549
550 debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, path);
551
552 if (stat (path, &statbuf) == 0 )
553 {
554 /* Don't read 0 length files: ignored */
555 /*if( statbuf.st_size == 0 )
556 return;*/
557 if ( S_ISDIR (statbuf.st_mode) )
558 {
559 /* strip last / from dirname so we don't need to check for it later */
560 while( path && path[1]!='\0' && path[strlen(path)-1] == '/')
561 path[strlen(path) -1] = '\0';
562
563 dir_operation(READ_CONFIG, path, 0, event_mask);
564 return;
565 }
566 if ( ( fp = fopen (path, "r") ) != NULL )
567 {
568 while (fgets (buf, STRING_LENGTH, fp) != NULL)
569 {
570 /* Skip whitespace */
571 for (line = buf; isspace (*line); ++line)
572 /*VOID*/;
573 if (line[0] == '\0' || line[0] == '#' )
574 continue;
575 process_config_line (line, event_mask);
576 }
577 fclose (fp);
578 } else {
579 goto read_config_file_err;
580 }
581 } else {
582read_config_file_err:
583 if(optional == 0 && errno == ENOENT)
584 msg_logger_and_die(LOG_ERR, "read config file: %s: %m", path);
585 }
586 return;
587} /* End Function read_config_file */
588
589static void process_config_line (const char *line, unsigned long *event_mask)
590/* [SUMMARY] Process a line from a configuration file.
591 <line> The configuration line.
592 <event_mask> The event mask is written here. This is not initialised.
593 [RETURNS] Nothing.
594*/
595{
596 int num_args, count;
597 struct config_entry_struct *new;
598 char p[MAX_ARGS][STRING_LENGTH];
599 char when[STRING_LENGTH], what[STRING_LENGTH];
600 char name[STRING_LENGTH];
601 char * msg="";
602 char *ptr;
603 int i;
604
605 /* !!!! Only Uppercase Keywords in devsfd.conf */
606 static const char *const options[] = {
607 "CLEAR_CONFIG", "INCLUDE", "OPTIONAL_INCLUDE",
608 "RESTORE", "PERMISSIONS", "MODLOAD", "EXECUTE",
609 "COPY", "IGNORE", "MKOLDCOMPAT", "MKNEWCOMPAT",
610 "RMOLDCOMPAT", "RMNEWCOMPAT", 0
611 };
612
613 debug_msg_logger(LOG_INFO, __FUNCTION__);
614
615 for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0';
616 num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s",
617 when, name, what,
618 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
619
620 i = index_in_str_array(options, when );
621
622 /*"CLEAR_CONFIG"*/
623 if( i == 0)
624 {
625 free_config ();
626 *event_mask = 0;
627 return;
628 }
629
630 if ( num_args < 2)
631 goto process_config_line_err;
632
633 /* "INCLUDE" & "OPTIONAL_INCLUDE" */
634 if( i == 1 || i == 2 )
635 {
636 st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL );
637 msg_logger(LOG_INFO, "%sinclude: %s",(toupper (when[0]) == 'I') ? "": "optional_", name);
638 read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask);
639 return;
640 }
641 /* "RESTORE" */
642 if( i == 3)
643 {
644 dir_operation(RESTORE,name, strlen (name),NULL);
645 return;
646 }
647 if (num_args < 3)
648 goto process_config_line_err;
649
650 new = xmalloc (sizeof *new);
651 memset (new, 0, sizeof *new);
652
653 for (count = 0; event_types[count].config_name != NULL; ++count)
654 {
655 if (strcasecmp (when, event_types[count].config_name) != 0)
656 continue;
657 new->action.when = event_types[count].type;
658 break;
659 }
660 if (event_types[count].config_name == NULL)
661 {
662 msg="WHEN in";
663 goto process_config_line_err;
664 }
665
666 i = index_in_str_array(options, what );
667
668 switch(i)
669 {
670 case 4: /* "PERMISSIONS" */
671 new->action.what = AC_PERMISSIONS;
672 /* Get user and group */
673 if ( ( ptr = strchr (p[0], '.') ) == NULL )
674 {
675 msg="UID.GID";
676 goto process_config_line_err; /*"missing '.' in UID.GID"*/
677 }
678
679 *ptr++ = '\0';
680 new->u.permissions.uid = get_uid_gid (UID, p[0]);
681 new->u.permissions.gid = get_uid_gid (GID, ptr);
682 /* Get mode */
683 new->u.permissions.mode = get_mode (p[1]);
684 break;
685 case 5: /* MODLOAD */
686 /*This action will pass "/dev/$devname" (i.e. "/dev/" prefixed to
687 the device name) to the module loading facility. In addition,
688 the /etc/modules.devfs configuration file is used.*/
689 if (ENABLE_DEVFSD_MODLOAD)
690 new->action.what = AC_MODLOAD;
691 break;
692 case 6: /* EXECUTE */
693 new->action.what = AC_EXECUTE;
694 num_args -= 3;
695
696 for (count = 0; count < num_args; ++count)
697 new->u.execute.argv[count] = xstrdup (p[count]);
698
699 new->u.execute.argv[num_args] = NULL;
700 break;
701 case 7: /* COPY */
702 new->action.what = AC_COPY;
703 num_args -= 3;
704 if (num_args != 2)
705 goto process_config_line_err; /* missing path and function in line */
706
707 new->u.copy.source = xstrdup (p[0]);
708 new->u.copy.destination = xstrdup (p[1]);
709 break;
710 case 8: /* IGNORE */
711 /* FALLTROUGH */
712 case 9: /* MKOLDCOMPAT */
713 /* FALLTROUGH */
714 case 10: /* MKNEWCOMPAT */
715 /* FALLTROUGH */
716 case 11:/* RMOLDCOMPAT */
717 /* FALLTROUGH */
718 case 12: /* RMNEWCOMPAT */
719 /* AC_IGNORE 6
720 AC_MKOLDCOMPAT 7
721 AC_MKNEWCOMPAT 8
722 AC_RMOLDCOMPAT 9
723 AC_RMNEWCOMPAT 10*/
724 new->action.what = i - 2;
725 break;
726 default:
727 msg ="WHAT in";
728 goto process_config_line_err;
729 /*esac*/
730 } /* switch (i) */
731
732 xregcomp( &new->preg, name, REG_EXTENDED);
733
734 *event_mask |= 1 << new->action.when;
735 new->next = NULL;
736 if (first_config == NULL)
737 first_config = new;
738 else
739 last_config->next = new;
740 last_config = new;
741 return;
742process_config_line_err:
743 msg_logger_and_die(LOG_ERR, bb_msg_bad_config, msg , line);
744} /* End Function process_config_line */
745
746static int do_servicing (int fd, unsigned long event_mask)
747/* [SUMMARY] Service devfs changes until a signal is received.
748 <fd> The open control file.
749 <event_mask> The event mask.
750 [RETURNS] TRUE if SIGHUP was caught, else FALSE.
751*/
752{
753 ssize_t bytes;
754 struct devfsd_notify_struct info;
755 unsigned long tmp_event_mask;
756
757 debug_msg_logger(LOG_INFO, __FUNCTION__);
758
759 /* Tell devfs what events we care about */
760 tmp_event_mask = event_mask;
761 do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
762 while (!caught_signal)
763 {
764 errno = 0;
765 bytes = read (fd, (char *) &info, sizeof info);
766 if (caught_signal)
767 break; /* Must test for this first */
768 if (errno == EINTR)
769 continue; /* Yes, the order is important */
770 if (bytes < 1)
771 break;
772 service_name (&info);
773 }
774 if (caught_signal)
775 {
776 int c_sighup = caught_sighup;
777
778 caught_signal = FALSE;
779 caught_sighup = FALSE;
780 return c_sighup;
781 }
782 msg_logger_and_die(LOG_ERR, "read error on control file");
783} /* End Function do_servicing */
784
785static void service_name (const struct devfsd_notify_struct *info)
786/* [SUMMARY] Service a single devfs change.
787 <info> The devfs change.
788 [RETURNS] Nothing.
789*/
790{
791 unsigned int n;
792 regmatch_t mbuf[MAX_SUBEXPR];
793 struct config_entry_struct *entry;
794
795 debug_msg_logger(LOG_INFO, __FUNCTION__);
796 if (ENABLE_DEBUG && info->overrun_count > 0)
797 debug_msg_logger(LOG_ERR, "lost %u events", info->overrun_count);
798
799 /* Discard lookups on "/dev/log" and "/dev/initctl" */
800 if( info->type == DEVFSD_NOTIFY_LOOKUP &&
801 ((info->devname[0]=='l' && info->devname[1]=='o' &&
802 info->devname[2]=='g' && !info->devname[3]) ||
803 ( info->devname[0]=='i' && info->devname[1]=='n' &&
804 info->devname[2]=='i' && info->devname[3]=='t' &&
805 info->devname[4]=='c' && info->devname[5]=='t' &&
806 info->devname[6]=='l' && !info->devname[7])))
807 return;
808 for (entry = first_config; entry != NULL; entry = entry->next)
809 {
810 /* First check if action matches the type, then check if name matches */
811 if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 )
812 continue;
813 for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
814 /* VOID */;
815
816 debug_msg_logger(LOG_INFO, "%s: action.what %d", __FUNCTION__, entry->action.what);
817
818 switch (entry->action.what)
819 {
820 case AC_PERMISSIONS:
821 action_permissions (info, entry);
822 break;
823 case AC_MODLOAD:
824 if(ENABLE_DEVFSD_MODLOAD)
825 action_modload (info, entry);
826 break;
827 case AC_EXECUTE:
828 action_execute (info, entry, mbuf, n);
829 break;
830 case AC_COPY:
831 action_copy (info, entry, mbuf, n);
832 break;
833 case AC_IGNORE:
834 return;
835 /*break;*/
836 case AC_MKOLDCOMPAT:
837 case AC_MKNEWCOMPAT:
838 case AC_RMOLDCOMPAT:
839 case AC_RMNEWCOMPAT:
840 action_compat (info, entry->action.what);
841 break;
842 default:
843 msg_logger_and_die(LOG_ERR, "Unknown action");
844 }
845 }
846} /* End Function service_name */
847
848static void action_permissions (const struct devfsd_notify_struct *info,
849 const struct config_entry_struct *entry)
850/* [SUMMARY] Update permissions for a device entry.
851 <info> The devfs change.
852 <entry> The config file entry.
853 [RETURNS] Nothing.
854*/
855{
856 struct stat statbuf;
857
858 debug_msg_logger(LOG_INFO, __FUNCTION__);
859
860 if ( stat (info->devname, &statbuf) != 0 ||
861 chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 ||
862 chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0)
863 {
864 msg_logger(LOG_ERR, "Can't chmod or chown: %s: %m",info->devname);
865 }
866} /* End Function action_permissions */
867
868static void action_modload (const struct devfsd_notify_struct *info,
869 const struct config_entry_struct *entry ATTRIBUTE_UNUSED)
870/* [SUMMARY] Load a module.
871 <info> The devfs change.
872 <entry> The config file entry.
873 [RETURNS] Nothing.
874*/
875{
876 char *argv[6];
877 char device[STRING_LENGTH];
878
879 argv[0] = MODPROBE;
880 argv[1] = MODPROBE_SWITCH_1; /* "-k" */
881 argv[2] = MODPROBE_SWITCH_2; /* "-C" */
882 argv[3] = CONFIG_MODULES_DEVFS;
883 argv[4] = device;
884 argv[5] = NULL;
885
886 snprintf (device, sizeof (device), "/dev/%s", info->devname);
887 debug_msg_logger(LOG_INFO, "%s: %s %s %s %s %s",__FUNCTION__, argv[0],argv[1],argv[2],argv[3],argv[4]);
888 fork_and_execute(DIE, argv[0], argv);
889} /* End Function action_modload */
890
891static void action_execute (const struct devfsd_notify_struct *info,
892 const struct config_entry_struct *entry,
893 const regmatch_t *regexpr, unsigned int numexpr)
894/* [SUMMARY] Execute a programme.
895 <info> The devfs change.
896 <entry> The config file entry.
897 <regexpr> The number of subexpression (start, end) offsets within the
898 device name.
899 <numexpr> The number of elements within <<regexpr>>.
900 [RETURNS] Nothing.
901*/
902{
903 unsigned int count;
904 struct get_variable_info gv_info;
905 char *argv[MAX_ARGS + 1];
906 char largv[MAX_ARGS + 1][STRING_LENGTH];
907
908 debug_msg_logger(LOG_INFO ,__FUNCTION__);
909 gv_info.info = info;
910 gv_info.devname = info->devname;
911 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
912 for (count = 0; entry->u.execute.argv[count] != NULL; ++count)
913 {
914 expand_expression (largv[count], STRING_LENGTH,
915 entry->u.execute.argv[count],
916 get_variable, &gv_info,
917 gv_info.devname, regexpr, numexpr );
918 argv[count] = largv[count];
919 }
920 argv[count] = NULL;
921 fork_and_execute(NO_DIE, argv[0], argv);
922} /* End Function action_execute */
923
924
925static void action_copy (const struct devfsd_notify_struct *info,
926 const struct config_entry_struct *entry,
927 const regmatch_t *regexpr, unsigned int numexpr)
928/* [SUMMARY] Copy permissions.
929 <info> The devfs change.
930 <entry> The config file entry.
931 <regexpr> This list of subexpression (start, end) offsets within the
932 device name.
933 <numexpr> The number of elements in <<regexpr>>.
934 [RETURNS] Nothing.
935*/
936{
937 mode_t new_mode;
938 struct get_variable_info gv_info;
939 struct stat source_stat, dest_stat;
940 char source[STRING_LENGTH], destination[STRING_LENGTH];
941 int ret = 0;
942
943 debug_msg_logger(LOG_INFO, __FUNCTION__);
944
945 dest_stat.st_mode = 0;
946
947 if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) )
948 return;
949 gv_info.info = info;
950 gv_info.devname = info->devname;
951
952 snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
953 expand_expression (source, STRING_LENGTH, entry->u.copy.source,
954 get_variable, &gv_info, gv_info.devname,
955 regexpr, numexpr);
956
957 expand_expression (destination, STRING_LENGTH, entry->u.copy.destination,
958 get_variable, &gv_info, gv_info.devname,
959 regexpr, numexpr);
960
961 if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0)
962 return;
963 lstat (destination, &dest_stat);
964 new_mode = source_stat.st_mode & ~S_ISVTX;
965 if (info->type == DEVFSD_NOTIFY_CREATE)
966 new_mode |= S_ISVTX;
967 else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) )
968 new_mode |= S_ISVTX;
969 ret = copy_inode (destination, &dest_stat, new_mode, source, &source_stat);
970 if (ENABLE_DEBUG && ret && (errno != EEXIST))
971 debug_msg_logger(LOG_ERR, "copy_inode: %s to %s: %m", source, destination);
972 return;
973} /* End Function action_copy */
974
975static void action_compat (const struct devfsd_notify_struct *info, unsigned int action)
976/* [SUMMARY] Process a compatibility request.
977 <info> The devfs change.
978 <action> The action to take.
979 [RETURNS] Nothing.
980*/
981{
982 int ret;
983 const char *compat_name = NULL;
984 const char *dest_name = info->devname;
985 char *ptr=NULL;
986 char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
987 int mode, host, bus, target, lun;
988 unsigned int i;
989 char rewind_;
990 /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
991 static const char *const fmt[] = {
992 NULL ,
993 "sg/c%db%dt%du%d", /* scsi/generic */
994 "sd/c%db%dt%du%d", /* scsi/disc */
995 "sr/c%db%dt%du%d", /* scsi/cd */
996 "sd/c%db%dt%du%dp%d", /* scsi/part */
997 "st/c%db%dt%du%dm%d%c", /* scsi/mt */
998 "ide/hd/c%db%dt%du%d", /* ide/host/disc */
999 "ide/cd/c%db%dt%du%d", /* ide/host/cd */
1000 "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
1001 "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
1002 NULL
1003 };
1004
1005 /* First construct compatibility name */
1006 switch (action)
1007 {
1008 case AC_MKOLDCOMPAT:
1009 case AC_RMOLDCOMPAT:
1010 compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor);
1011 break;
1012 case AC_MKNEWCOMPAT:
1013 case AC_RMNEWCOMPAT:
1014 ptr = strrchr (info->devname, '/') + 1;
1015 i=scan_dev_name(info->devname, info->namelen, ptr);
1016
1017 debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i);
1018
1019 /* nothing found */
1020 if(i==0 || i > 9)
1021 return;
1022
1023 sscanf (info->devname +((i<6)?5:4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
1024 snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + ((i>5)?4:0));
1025 dest_name = dest_buf;
1026 compat_name = compat_buf;
1027
1028
1029 /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
1030 if( i == 1 || i == 2 || i == 3 || i == 6 || i ==7 )
1031 sprintf ( compat_buf, fmt[i], host, bus, target, lun);
1032
1033 /* 4 == scsi/part 8 == ide/host/part */
1034 if( i == 4 || i == 8)
1035 sprintf ( compat_buf, fmt[i], host, bus, target, lun, atoi (ptr + 4) );
1036
1037 /* 5 == scsi/mt */
1038 if( i == 5)
1039 {
1040 rewind_ = info->devname[info->namelen - 1];
1041 if (rewind_ != 'n')
1042 rewind_ = '\0';
1043 mode=0;
1044 if(ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
1045 mode = ptr[2] - 107; /* 1 or 2 */
1046 if(ptr[2] == 'a')
1047 mode = 3;
1048 sprintf (compat_buf, fmt [i], host, bus, target, lun, mode, rewind_);
1049 }
1050
1051 /* 9 == ide/host/mt */
1052 if( i == 9 )
1053 snprintf (compat_buf, sizeof (compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
1054 /* esac */
1055 } /* switch(action) */
1056
1057 if(compat_name == NULL )
1058 return;
1059
1060 debug_msg_logger( LOG_INFO, "%s: %s", __FUNCTION__, compat_name);
1061
1062 /* Now decide what to do with it */
1063 switch (action)
1064 {
1065 case AC_MKOLDCOMPAT:
1066 case AC_MKNEWCOMPAT:
1067 mksymlink (dest_name, compat_name);
1068 break;
1069 case AC_RMOLDCOMPAT:
1070 case AC_RMNEWCOMPAT:
1071 ret = unlink (compat_name);
1072 if (ENABLE_DEBUG && ret)
1073 debug_msg_logger(LOG_ERR, "unlink: %s: %m", compat_name);
1074 break;
1075 /*esac*/
1076 } /* switch(action) */
1077} /* End Function action_compat */
1078
1079static void restore(char *spath, struct stat source_stat, int rootlen)
1080{
1081 char dpath[STRING_LENGTH];
1082 struct stat dest_stat;
1083
1084 debug_msg_logger(LOG_INFO, __FUNCTION__);
1085
1086 dest_stat.st_mode = 0;
1087 snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen);
1088 lstat (dpath, &dest_stat);
1089
1090 if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) )
1091 copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
1092
1093 if ( S_ISDIR (source_stat.st_mode) )
1094 dir_operation(RESTORE, spath, rootlen,NULL);
1095}
1096
1097
1098static int copy_inode (const char *destpath, const struct stat *dest_stat,
1099 mode_t new_mode,
1100 const char *sourcepath, const struct stat *source_stat)
1101/* [SUMMARY] Copy an inode.
1102 <destpath> The destination path. An existing inode may be deleted.
1103 <dest_stat> The destination stat(2) information.
1104 <new_mode> The desired new mode for the destination.
1105 <sourcepath> The source path.
1106 <source_stat> The source stat(2) information.
1107 [RETURNS] TRUE on success, else FALSE.
1108*/
1109{
1110 int source_len, dest_len;
1111 char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
1112 int fd, val;
1113 struct sockaddr_un un_addr;
1114 char symlink_val[STRING_LENGTH];
1115
1116 debug_msg_logger(LOG_INFO, __FUNCTION__);
1117
1118 if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) )
1119 {
1120 /* Same type */
1121 if ( S_ISLNK (source_stat->st_mode) )
1122 {
1123 if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 ||
1124 ( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 )
1125 return FALSE;
1126 source_link[source_len] = '\0';
1127 dest_link[dest_len] = '\0';
1128 if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) )
1129 {
1130 unlink (destpath);
1131 symlink (source_link, destpath);
1132 }
1133 return TRUE;
1134 } /* Else not a symlink */
1135 chmod (destpath, new_mode & ~S_IFMT);
1136 chown (destpath, source_stat->st_uid, source_stat->st_gid);
1137 return TRUE;
1138 }
1139 /* Different types: unlink and create */
1140 unlink (destpath);
1141 switch (source_stat->st_mode & S_IFMT)
1142 {
1143 case S_IFSOCK:
1144 if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 )
1145 break;
1146 un_addr.sun_family = AF_UNIX;
1147 snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath);
1148 val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr);
1149 close (fd);
1150 if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0)
1151 break;
1152 goto do_chown;
1153 case S_IFLNK:
1154 if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 )
1155 break;
1156 symlink_val[val] = '\0';
1157 if (symlink (symlink_val, destpath) == 0)
1158 return TRUE;
1159 break;
1160 case S_IFREG:
1161 if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 )
1162 break;
1163 close (fd);
1164 if (chmod (destpath, new_mode & ~S_IFMT) != 0)
1165 break;
1166 goto do_chown;
1167 case S_IFBLK:
1168 case S_IFCHR:
1169 case S_IFIFO:
1170 if (mknod (destpath, new_mode, source_stat->st_rdev) != 0)
1171 break;
1172 goto do_chown;
1173 case S_IFDIR:
1174 if (mkdir (destpath, new_mode & ~S_IFMT) != 0)
1175 break;
1176do_chown:
1177 if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
1178 return TRUE;
1179 /*break;*/
1180 }
1181 return FALSE;
1182} /* End Function copy_inode */
1183
1184static void free_config (void)
1185/* [SUMMARY] Free the configuration information.
1186 [RETURNS] Nothing.
1187*/
1188{
1189 struct config_entry_struct *c_entry;
1190 void *next;
1191
1192 debug_msg_logger(LOG_INFO, __FUNCTION__);
1193
1194 for (c_entry = first_config; c_entry != NULL; c_entry = next)
1195 {
1196 unsigned int count;
1197
1198 next = c_entry->next;
1199 regfree (&c_entry->preg);
1200 if (c_entry->action.what == AC_EXECUTE)
1201 {
1202 for (count = 0; count < MAX_ARGS; ++count)
1203 {
1204 if (c_entry->u.execute.argv[count] == NULL)
1205 break;
1206 free (c_entry->u.execute.argv[count]);
1207 }
1208 }
1209 free (c_entry);
1210 }
1211 first_config = NULL;
1212 last_config = NULL;
1213} /* End Function free_config */
1214
1215static int get_uid_gid (int flag, const char *string)
1216/* [SUMMARY] Convert a string to a UID or GID value.
1217 <flag> "UID" or "GID".
1218 <string> The string.
1219 [RETURNS] The UID or GID value.
1220*/
1221{
1222 struct passwd *pw_ent;
1223 struct group *grp_ent;
1224 static char *msg;
1225
1226 if (ENABLE_DEVFSD_VERBOSE)
1227 msg="user";
1228
1229 debug_msg_logger(LOG_INFO, __FUNCTION__);
1230
1231 if(ENABLE_DEBUG && flag != UID && flag != GID)
1232 msg_logger_and_die(LOG_ERR,"%s: flag != UID && flag != GID", __FUNCTION__);
1233
1234 if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) )
1235 return atoi(string);
1236
1237 if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL )
1238 return pw_ent->pw_uid;
1239
1240 if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL )
1241 return grp_ent->gr_gid;
1242 else if(ENABLE_DEVFSD_VERBOSE)
1243 msg="group";
1244
1245 if(ENABLE_DEVFSD_VERBOSE)
1246 msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]);
1247 return 0;
1248}/* End Function get_uid_gid */
1249
1250static mode_t get_mode (const char *string)
1251/* [SUMMARY] Convert a string to a mode value.
1252 <string> The string.
1253 [RETURNS] The mode value.
1254*/
1255{
1256 mode_t mode;
1257 int i;
1258
1259 debug_msg_logger(LOG_INFO, __FUNCTION__);
1260
1261 if ( isdigit (string[0]) )
1262 return strtoul(string, NULL, 8);
1263 if (strlen (string) != 9)
1264 msg_logger_and_die(LOG_ERR, "bad mode: %s", string);
1265
1266 mode = 0;
1267 i= S_IRUSR;
1268 while(i>0)
1269 {
1270 if(string[0]=='r'||string[0]=='w'||string[0]=='x')
1271 mode+=i;
1272 i=i/2;
1273 string++;
1274 }
1275 return mode;
1276} /* End Function get_mode */
1277
1278static void signal_handler (int sig)
1279{
1280 debug_msg_logger(LOG_INFO, __FUNCTION__);
1281
1282 caught_signal = TRUE;
1283 if (sig == SIGHUP)
1284 caught_sighup = TRUE;
1285
1286 msg_logger(LOG_INFO, "Caught signal %d", sig);
1287} /* End Function signal_handler */
1288
1289static const char *get_variable (const char *variable, void *info)
1290{
1291 struct get_variable_info *gv_info = info;
1292 static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH];
1293 const char *field_names[] = { "hostname", "mntpt", "devpath", "devname",
1294 "uid", "gid", "mode", hostname, mount_point,
1295 gv_info->devpath, gv_info->devname, 0 };
1296 int i;
1297
1298 debug_msg_logger(LOG_INFO, __FUNCTION__);
1299
1300 if (gethostname (hostname, STRING_LENGTH - 1) != 0)
1301 msg_logger_and_die(LOG_ERR, "gethostname: %m");
1302
1303 /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
1304 hostname[STRING_LENGTH - 1] = '\0';
1305
1306 /* index_in_str_array returns i>=0 */
1307 i=index_in_str_array(field_names, variable);
1308
1309 if ( i > 6 || i < 0 || (i > 1 && gv_info == NULL))
1310 return NULL;
1311 if( i >= 0 && i <= 3)
1312 {
1313 debug_msg_logger(LOG_INFO, "%s: i=%d %s", __FUNCTION__, i ,field_names[i+7]);
1314 return field_names[i+7];
1315 }
1316
1317 if(i == 4 )
1318 sprintf (sbuf, "%u", gv_info->info->uid);
1319 else if(i == 5)
1320 sprintf (sbuf, "%u", gv_info->info->gid);
1321 else if(i == 6)
1322 sprintf (sbuf, "%o", gv_info->info->mode);
1323
1324 debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, sbuf);
1325
1326 return sbuf;
1327} /* End Function get_variable */
1328
1329static void service(struct stat statbuf, char *path)
1330{
1331 struct devfsd_notify_struct info;
1332
1333 debug_msg_logger(LOG_INFO, __FUNCTION__);
1334
1335 memset (&info, 0, sizeof info);
1336 info.type = DEVFSD_NOTIFY_REGISTERED;
1337 info.mode = statbuf.st_mode;
1338 info.major = major (statbuf.st_rdev);
1339 info.minor = minor (statbuf.st_rdev);
1340 info.uid = statbuf.st_uid;
1341 info.gid = statbuf.st_gid;
1342 snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1);
1343 info.namelen = strlen (info.devname);
1344 service_name (&info);
1345 if ( S_ISDIR (statbuf.st_mode) )
1346 dir_operation(SERVICE,path,0,NULL);
1347}
1348
1349static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
1350/* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
1351 <flag> To choose which function to perform
1352 <dp> The directory pointer. This is closed upon completion.
1353 <dir_name> The name of the directory.
1354 <rootlen> string length parameter.
1355 [RETURNS] Nothing.
1356*/
1357{
1358 struct stat statbuf;
1359 DIR *dp;
1360 struct dirent *de;
1361 char path[STRING_LENGTH];
1362
1363 debug_msg_logger(LOG_INFO, __FUNCTION__);
1364
1365 if((dp = opendir( dir_name))==NULL)
1366 {
1367 debug_msg_logger(LOG_ERR, "opendir: %s: %m", dir_name);
1368 return;
1369 }
1370
1371 while ( (de = readdir (dp) ) != NULL )
1372 {
1373
1374 if(de->d_name && *de->d_name == '.' && (!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2])))
1375 continue;
1376 snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name);
1377 debug_msg_logger(LOG_ERR, "%s: %s", __FUNCTION__, path);
1378
1379 if (lstat (path, &statbuf) != 0)
1380 {
1381 debug_msg_logger(LOG_ERR, "%s: %s: %m", __FUNCTION__, path);
1382 continue;
1383 }
1384 switch(type)
1385 {
1386 case SERVICE:
1387 service(statbuf,path);
1388 break;
1389 case RESTORE:
1390 restore(path, statbuf, var);
1391 break;
1392 case READ_CONFIG:
1393 read_config_file (path, var, event_mask);
1394 break;
1395 }
1396 }
1397 closedir (dp);
1398} /* End Function do_scan_and_service */
1399
1400static int mksymlink (const char *oldpath, const char *newpath)
1401/* [SUMMARY] Create a symlink, creating intervening directories as required.
1402 <oldpath> The string contained in the symlink.
1403 <newpath> The name of the new symlink.
1404 [RETURNS] 0 on success, else -1.
1405*/
1406{
1407 debug_msg_logger(LOG_INFO, __FUNCTION__);
1408
1409 if ( !make_dir_tree (newpath) )
1410 return -1;
1411
1412 if (symlink (oldpath, newpath) != 0) {
1413 if (errno != EEXIST) {
1414 debug_msg_logger(LOG_ERR, "%s: %s to %s: %m", __FUNCTION__, oldpath, newpath);
1415 return -1;
1416 }
1417 }
1418 return 0;
1419} /* End Function mksymlink */
1420
1421
1422static int make_dir_tree (const char *path)
1423/* [SUMMARY] Creating intervening directories for a path as required.
1424 <path> The full pathname (including the leaf node).
1425 [RETURNS] TRUE on success, else FALSE.
1426*/
1427{
1428 debug_msg_logger(LOG_INFO, __FUNCTION__);
1429
1430 if (bb_make_directory( dirname((char *)path), -1, FILEUTILS_RECUR )==-1)
1431 {
1432 debug_msg_logger(LOG_ERR, "%s: %s: %m",__FUNCTION__, path);
1433 return FALSE;
1434 }
1435 return TRUE;
1436} /* End Function make_dir_tree */
1437
1438static int expand_expression(char *output, unsigned int outsize,
1439 const char *input,
1440 const char *(*get_variable_func)(const char *variable, void *info),
1441 void *info,
1442 const char *devname,
1443 const regmatch_t *ex, unsigned int numexp)
1444/* [SUMMARY] Expand environment variables and regular subexpressions in string.
1445 <output> The output expanded expression is written here.
1446 <length> The size of the output buffer.
1447 <input> The input expression. This may equal <<output>>.
1448 <get_variable> A function which will be used to get variable values. If
1449 this returns NULL, the environment is searched instead. If this is NULL,
1450 only the environment is searched.
1451 <info> An arbitrary pointer passed to <<get_variable>>.
1452 <devname> Device name; specifically, this is the string that contains all
1453 of the regular subexpressions.
1454 <ex> Array of start / end offsets into info->devname for each subexpression
1455 <numexp> Number of regular subexpressions found in <<devname>>.
1456 [RETURNS] TRUE on success, else FALSE.
1457*/
1458{
1459 char temp[STRING_LENGTH];
1460
1461 debug_msg_logger(LOG_INFO, __FUNCTION__);
1462
1463 if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) )
1464 return FALSE;
1465 expand_regexp (output, outsize, temp, devname, ex, numexp);
1466 return TRUE;
1467} /* End Function expand_expression */
1468
1469static void expand_regexp (char *output, size_t outsize, const char *input,
1470 const char *devname,
1471 const regmatch_t *ex, unsigned int numex )
1472/* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
1473 <output> The output expanded expression is written here.
1474 <outsize> The size of the output buffer.
1475 <input> The input expression. This may NOT equal <<output>>, because
1476 supporting that would require yet another string-copy. However, it's not
1477 hard to write a simple wrapper function to add this functionality for those
1478 few cases that need it.
1479 <devname> Device name; specifically, this is the string that contains all
1480 of the regular subexpressions.
1481 <ex> An array of start and end offsets into <<devname>>, one for each
1482 subexpression
1483 <numex> Number of subexpressions in the offset-array <<ex>>.
1484 [RETURNS] Nothing.
1485*/
1486{
1487 const char last_exp = '0' - 1 + numex;
1488 int c = -1;
1489
1490 debug_msg_logger(LOG_INFO, __FUNCTION__);
1491
1492 /* Guarantee NULL termination by writing an explicit '\0' character into
1493 the very last byte */
1494 if (outsize)
1495 output[--outsize] = '\0';
1496 /* Copy the input string into the output buffer, replacing '\\' with '\'
1497 and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
1498 codes are deleted */
1499 while ( (c != '\0') && (outsize != 0) )
1500 {
1501 c = *input;
1502 ++input;
1503 if (c == '\\')
1504 {
1505 c = *input;
1506 ++input;
1507 if (c != '\\')
1508 {
1509 if ((c >= '0') && (c <= last_exp))
1510 {
1511 const regmatch_t *subexp = ex + (c - '0');
1512 unsigned int sublen = subexp->rm_eo - subexp->rm_so;
1513
1514 /* Range checking */
1515 if (sublen > outsize)
1516 sublen = outsize;
1517 strncpy (output, devname + subexp->rm_so, sublen);
1518 output += sublen;
1519 outsize -= sublen;
1520 }
1521 continue;
1522 }
1523 }
1524 *output = c;
1525 ++output;
1526 --outsize;
1527 } /* while */
1528} /* End Function expand_regexp */
1529
1530
1531/* from compat_name.c */
1532
1533struct translate_struct
1534{
1535 char *match; /* The string to match to (up to length) */
1536 char *format; /* Format of output, "%s" takes data past match string,
1537 NULL is effectively "%s" (just more efficient) */
1538};
1539
1540static struct translate_struct translate_table[] =
1541{
1542 {"sound/", NULL},
1543 {"printers/", "lp%s"},
1544 {"v4l/", NULL},
1545 {"parports/", "parport%s"},
1546 {"fb/", "fb%s"},
1547 {"netlink/", NULL},
1548 {"loop/", "loop%s"},
1549 {"floppy/", "fd%s"},
1550 {"rd/", "ram%s"},
1551 {"md/", "md%s"}, /* Meta-devices */
1552 {"vc/", "tty%s"},
1553 {"misc/", NULL},
1554 {"isdn/", NULL},
1555 {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
1556 {"i2c/", "i2c-%s"},
1557 {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
1558 {"tts/E", "ttyE%s"}, /* Stallion serial driver */
1559 {"cua/E", "cue%s"}, /* Stallion serial driver callout */
1560 {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
1561 {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
1562 {"ip2/", "ip2%s"}, /* Computone serial driver control */
1563 {"tts/F", "ttyF%s"}, /* Computone serial driver */
1564 {"cua/F", "cuf%s"}, /* Computone serial driver callout */
1565 {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
1566 {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
1567 {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
1568 {"cua/", "cua%s"}, /* Generic serial: must be after others */
1569 {"input/js", "js%s"}, /* Joystick driver */
1570 {NULL, NULL}
1571};
1572
1573const char *get_old_name (const char *devname, unsigned int namelen,
1574 char *buffer, unsigned int major, unsigned int minor)
1575/* [SUMMARY] Translate a kernel-supplied name into an old name.
1576 <devname> The device name provided by the kernel.
1577 <namelen> The length of the name.
1578 <buffer> A buffer that may be used. This should be at least 128 bytes long.
1579 <major> The major number for the device.
1580 <minor> The minor number for the device.
1581 [RETURNS] A pointer to the old name if known, else NULL.
1582*/
1583{
1584 const char *compat_name = NULL;
1585 char *ptr;
1586 struct translate_struct *trans;
1587 unsigned int i;
1588 char mode;
1589 int indexx;
1590 const char *pty1;
1591 const char *pty2;
1592 size_t len;
1593 /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
1594 static const char *const fmt[] = {
1595 NULL ,
1596 "sg%u", /* scsi/generic */
1597 NULL, /* scsi/disc */
1598 "sr%u", /* scsi/cd */
1599 NULL, /* scsi/part */
1600 "nst%u%c", /* scsi/mt */
1601 "hd%c" , /* ide/host/disc */
1602 "hd%c" , /* ide/host/cd */
1603 "hd%c%s", /* ide/host/part */
1604 "%sht%d", /* ide/host/mt */
1605 "sbpcd%u", /* sbp/ */
1606 "vcs%s", /* vcc/ */
1607 "%cty%c%c", /* pty/ */
1608 NULL
1609 };
1610
1611 debug_msg_logger(LOG_INFO, __FUNCTION__);
1612
1613 for (trans = translate_table; trans->match != NULL; ++trans)
1614 {
1615 len = strlen (trans->match);
1616
1617 if (strncmp (devname, trans->match, len) == 0)
1618 {
1619 if (trans->format == NULL)
1620 return devname + len;
1621 sprintf (buffer, trans->format, devname + len);
1622 return buffer;
1623 }
1624 }
1625
1626 ptr = (strrchr (devname, '/') + 1);
1627 i = scan_dev_name(devname, namelen, ptr);
1628
1629 if( i > 0 && i < 13)
1630 compat_name = buffer;
1631 else
1632 return NULL;
1633
1634 debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i);
1635
1636 /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
1637 if( i == 1 || i == 3 || i == 10 )
1638 sprintf (buffer, fmt[i], minor);
1639
1640 /* 2 ==scsi/disc, 4 == scsi/part */
1641 if( i == 2 || i == 4)
1642 compat_name = write_old_sd_name (buffer, major, minor,((i == 2)?"":(ptr + 4)));
1643
1644 /* 5 == scsi/mt */
1645 if( i == 5)
1646 {
1647 mode = ptr[2];
1648 if (mode == 'n')
1649 mode = '\0';
1650 sprintf (buffer, fmt[i], minor & 0x1f, mode);
1651 if (devname[namelen - 1] != 'n')
1652 ++compat_name;
1653 }
1654 /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
1655 if( i == 6 || i == 7 || i == 8 )
1656 /* last arg should be ignored for i == 6 or i== 7 */
1657 sprintf (buffer, fmt[i] , get_old_ide_name (major, minor), ptr + 4);
1658
1659 /* 9 == ide/host/mt */
1660 if( i == 9 )
1661 sprintf (buffer, fmt[i], ptr + 2, minor & 0x7f);
1662
1663 /* 11 == vcc/ */
1664 if( i == 11 )
1665 {
1666 sprintf (buffer, fmt[i], devname + 4);
1667 if (buffer[3] == '0')
1668 buffer[3] = '\0';
1669 }
1670 /* 12 == pty/ */
1671 if( i == 12 )
1672 {
1673 pty1 = "pqrstuvwxyzabcde";
1674 pty2 = "0123456789abcdef";
1675 indexx = atoi (devname + 5);
1676 sprintf (buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
1677 }
1678
1679 if(ENABLE_DEBUG && compat_name!=NULL)
1680 msg_logger(LOG_INFO, "%s: compat_name %s", __FUNCTION__, compat_name);
1681
1682 return compat_name;
1683} /* End Function get_old_name */
1684
1685static char get_old_ide_name (unsigned int major, unsigned int minor)
1686/* [SUMMARY] Get the old IDE name for a device.
1687 <major> The major number for the device.
1688 <minor> The minor number for the device.
1689 [RETURNS] The drive letter.
1690*/
1691{
1692 char letter='y'; /* 121 */
1693 char c='a'; /* 97 */
1694 int i=IDE0_MAJOR;
1695
1696 debug_msg_logger(LOG_INFO, __FUNCTION__);
1697
1698 /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
1699 do {
1700 if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR ||
1701 i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR ||
1702 i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR ||
1703 i==IDE9_MAJOR )
1704 {
1705 if((unsigned int)i==major)
1706 {
1707 letter=c;
1708 break;
1709 }
1710 c+=2;
1711 }
1712 i++;
1713 } while(i<=IDE9_MAJOR);
1714
1715 if (minor > 63)
1716 ++letter;
1717 return letter;
1718} /* End Function get_old_ide_name */
1719
1720static char *write_old_sd_name (char *buffer,
1721 unsigned int major, unsigned int minor,
1722 char *part)
1723/* [SUMMARY] Write the old SCSI disc name to a buffer.
1724 <buffer> The buffer to write to.
1725 <major> The major number for the device.
1726 <minor> The minor number for the device.
1727 <part> The partition string. Must be "" for a whole-disc entry.
1728 [RETURNS] A pointer to the buffer on success, else NULL.
1729*/
1730{
1731 unsigned int disc_index;
1732
1733 debug_msg_logger(LOG_INFO, __FUNCTION__);
1734
1735 if (major == 8)
1736 {
1737 sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part);
1738 return buffer;
1739 }
1740 if ( (major > 64) && (major < 72) )
1741 {
1742 disc_index = ( (major - 64) << 4 ) + (minor >> 4);
1743 if (disc_index < 26)
1744 sprintf (buffer, "sd%c%s", 'a' + disc_index, part);
1745 else
1746 sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part);
1747 return buffer;
1748 }
1749 return NULL;
1750} /* End Function write_old_sd_name */
1751
1752
1753/* expression.c */
1754
1755/*EXPERIMENTAL_FUNCTION*/
1756
1757int st_expr_expand (char *output, unsigned int length, const char *input,
1758 const char *(*get_variable_func) (const char *variable,
1759 void *info),
1760 void *info)
1761/* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
1762 <output> The output expanded expression is written here.
1763 <length> The size of the output buffer.
1764 <input> The input expression. This may equal <<output>>.
1765 <get_variable> A function which will be used to get variable values. If
1766 this returns NULL, the environment is searched instead. If this is NULL,
1767 only the environment is searched.
1768 <info> An arbitrary pointer passed to <<get_variable>>.
1769 [RETURNS] TRUE on success, else FALSE.
1770*/
1771{
1772 char ch;
1773 unsigned int len;
1774 unsigned int out_pos = 0;
1775 const char *env;
1776 const char *ptr;
1777 struct passwd *pwent;
1778 char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
1779
1780 debug_msg_logger(LOG_INFO, __FUNCTION__);
1781
1782 if (length > BUFFER_SIZE)
1783 length = BUFFER_SIZE;
1784 for (; TRUE; ++input)
1785 {
1786 switch (ch = *input)
1787 {
1788 case '$':
1789 /* Variable expansion */
1790 input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info);
1791 if (input == NULL)
1792 return FALSE;
1793 break;
1794 case '~':
1795 /* Home directory expansion */
1796 ch = input[1];
1797 if ( isspace (ch) || (ch == '/') || (ch == '\0') )
1798 {
1799 /* User's own home directory: leave separator for next time */
1800 if ( ( env = getenv ("HOME") ) == NULL )
1801 {
1802 msg_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
1803 return FALSE;
1804 }
1805 len = strlen (env);
1806 if (len + out_pos >= length)
1807 goto st_expr_expand_out;
1808 memcpy (buffer + out_pos, env, len + 1);
1809 out_pos += len;
1810 continue;
1811 }
1812 /* Someone else's home directory */
1813 for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
1814 /* VOID */ ;
1815 len = ptr - input;
1816 if (len >= sizeof tmp)
1817 goto st_expr_expand_out;
1818 safe_memcpy (tmp, input, len);
1819 input = ptr - 1;
1820 if ( ( pwent = getpwnam (tmp) ) == NULL )
1821 {
1822 msg_logger(LOG_INFO, "no pwent for: %s", tmp);
1823 return FALSE;
1824 }
1825 len = strlen (pwent->pw_dir);
1826 if (len + out_pos >= length)
1827 goto st_expr_expand_out;
1828 memcpy (buffer + out_pos, pwent->pw_dir, len + 1);
1829 out_pos += len;
1830 break;
1831 case '\0':
1832 /* Falltrough */
1833 default:
1834 if (out_pos >= length)
1835 goto st_expr_expand_out;
1836 buffer[out_pos++] = ch;
1837 if (ch == '\0')
1838 {
1839 memcpy (output, buffer, out_pos);
1840 return TRUE;
1841 }
1842 break;
1843 /* esac */
1844 }
1845 }
1846 return FALSE;
1847st_expr_expand_out:
1848 msg_logger(LOG_INFO, bb_msg_small_buffer);
1849 return FALSE;
1850} /* End Function st_expr_expand */
1851
1852
1853/* Private functions follow */
1854
1855static const char *expand_variable (char *buffer, unsigned int length,
1856 unsigned int *out_pos, const char *input,
1857 const char *(*func) (const char *variable,
1858 void *info),
1859 void *info)
1860/* [SUMMARY] Expand a variable.
1861 <buffer> The buffer to write to.
1862 <length> The length of the output buffer.
1863 <out_pos> The current output position. This is updated.
1864 <input> A pointer to the input character pointer.
1865 <func> A function which will be used to get variable values. If this
1866 returns NULL, the environment is searched instead. If this is NULL, only
1867 the environment is searched.
1868 <info> An arbitrary pointer passed to <<func>>.
1869 <errfp> Diagnostic messages are written here.
1870 [RETURNS] A pointer to the end of this subexpression on success, else NULL.
1871*/
1872{
1873 char ch;
1874 int len;
1875 unsigned int open_braces;
1876 const char *env, *ptr;
1877 char tmp[STRING_LENGTH];
1878
1879 debug_msg_logger(LOG_INFO, __FUNCTION__);
1880
1881 ch = input[0];
1882 if (ch == '$')
1883 {
1884 /* Special case for "$$": PID */
1885 sprintf ( tmp, "%d", (int) getpid () );
1886 len = strlen (tmp);
1887 if (len + *out_pos >= length)
1888 goto expand_variable_out;
1889
1890 memcpy (buffer + *out_pos, tmp, len + 1);
1891 out_pos += len;
1892 return input;
1893 }
1894 /* Ordinary variable expansion, possibly in braces */
1895 if (ch != '{')
1896 {
1897 /* Simple variable expansion */
1898 for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr)
1899 /* VOID */ ;
1900 len = ptr - input;
1901 if ((size_t)len >= sizeof tmp)
1902 goto expand_variable_out;
1903
1904 safe_memcpy (tmp, input, len);
1905 input = ptr - 1;
1906 if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL )
1907 {
1908 msg_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
1909 return NULL;
1910 }
1911 len = strlen (env);
1912 if (len + *out_pos >= length)
1913 goto expand_variable_out;
1914
1915 memcpy (buffer + *out_pos, env, len + 1);
1916 *out_pos += len;
1917 return input;
1918 }
1919 /* Variable in braces: check for ':' tricks */
1920 ch = *++input;
1921 for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr)
1922 /* VOID */;
1923 if (ch == '}')
1924 {
1925 /* Must be simple variable expansion with "${var}" */
1926 len = ptr - input;
1927 if ((size_t)len >= sizeof tmp)
1928 goto expand_variable_out;
1929
1930 safe_memcpy (tmp, input, len);
1931 ptr = expand_variable (buffer, length, out_pos, tmp, func, info );
1932 if (ptr == NULL)
1933 return NULL;
1934 return input + len;
1935 }
1936 if (ch != ':' || ptr[1] != '-' )
1937 {
1938 msg_logger(LOG_INFO, "illegal char in var name");
1939 return NULL;
1940 }
1941 /* It's that handy "${var:-word}" expression. Check if var is defined */
1942 len = ptr - input;
1943 if ((size_t)len >= sizeof tmp)
1944 goto expand_variable_out;
1945
1946 safe_memcpy (tmp, input, len);
1947 /* Move input pointer to ':' */
1948 input = ptr;
1949 /* First skip to closing brace, taking note of nested expressions */
1950 ptr += 2;
1951 ch = ptr[0];
1952 for (open_braces = 1; open_braces > 0; ch = *++ptr)
1953 {
1954 switch (ch)
1955 {
1956 case '{':
1957 ++open_braces;
1958 break;
1959 case '}':
1960 --open_braces;
1961 break;
1962 case '\0':
1963 msg_logger(LOG_INFO,"\"}\" not found in: %s", input);
1964 return NULL;
1965 default:
1966 break;
1967 }
1968 }
1969 --ptr;
1970 /* At this point ptr should point to closing brace of "${var:-word}" */
1971 if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL )
1972 {
1973 /* Found environment variable, so skip the input to the closing brace
1974 and return the variable */
1975 input = ptr;
1976 len = strlen (env);
1977 if (len + *out_pos >= length)
1978 goto expand_variable_out;
1979
1980 memcpy (buffer + *out_pos, env, len + 1);
1981 *out_pos += len;
1982 return input;
1983 }
1984 /* Environment variable was not found, so process word. Advance input
1985 pointer to start of word in "${var:-word}" */
1986 input += 2;
1987 len = ptr - input;
1988 if ((size_t)len >= sizeof tmp)
1989 goto expand_variable_out;
1990
1991 safe_memcpy (tmp, input, len);
1992 input = ptr;
1993 if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) )
1994 return NULL;
1995 len = strlen (tmp);
1996 if (len + *out_pos >= length)
1997 goto expand_variable_out;
1998
1999 memcpy (buffer + *out_pos, tmp, len + 1);
2000 *out_pos += len;
2001 return input;
2002expand_variable_out:
2003 msg_logger(LOG_INFO, bb_msg_small_buffer);
2004 return NULL;
2005} /* End Function expand_variable */
2006
2007
2008static const char *get_variable_v2 (const char *variable,
2009 const char *(*func) (const char *variable, void *info),
2010 void *info)
2011/* [SUMMARY] Get a variable from the environment or .
2012 <variable> The variable name.
2013 <func> A function which will be used to get the variable. If this returns
2014 NULL, the environment is searched instead. If this is NULL, only the
2015 environment is searched.
2016 [RETURNS] The value of the variable on success, else NULL.
2017*/
2018{
2019 const char *value;
2020
2021 debug_msg_logger(LOG_INFO, __FUNCTION__);
2022
2023 if (func != NULL)
2024 {
2025 value = (*func) (variable, info);
2026 if (value != NULL)
2027 return value;
2028 }
2029 return getenv(variable);
2030} /* End Function get_variable */
2031
2032/* END OF CODE */
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-14 11:25:57 +0000