--- /dev/null
+/*
+ devfsd implementation for busybox
+
+ Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
+
+ Busybox version is based on some previous work and ideas
+ Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it>
+
+ devfsd.c
+
+ Main file for devfsd (devfs daemon for Linux).
+
+ Copyright (C) 1998-2002 Richard Gooch
+
+ devfsd.h
+
+ Header file for devfsd (devfs daemon for Linux).
+
+ Copyright (C) 1998-2000 Richard Gooch
+
+ compat_name.c
+
+ Compatibility name file for devfsd (build compatibility names).
+
+ Copyright (C) 1998-2002 Richard Gooch
+
+ expression.c
+
+ This code provides Borne Shell-like expression expansion.
+
+ Copyright (C) 1997-1999 Richard Gooch
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ Richard Gooch may be reached by email at rgooch@atnf.csiro.au
+ The postal address is:
+ Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
+*/
+
+#include "libbb.h"
+#include "busybox.h"
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <ctype.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <linux/major.h>
+#include <linux/devfs_fs.h>
+#include <linux/kdev_t.h>
+#include <syslog.h>
+#include <signal.h>
+#include <regex.h>
+#include <errno.h>
+
+#ifndef IDE6_MAJOR /* In case we're building with an ancient kernel */
+# define IDE6_MAJOR 88
+# define IDE7_MAJOR 89
+# define IDE8_MAJOR 90
+# define IDE9_MAJOR 91
+#endif
+
+/* These are now in Config.in */
+/* define this if you want to have more output on stderr and syslog at the same time */
+/*#define CONFIG_DEVFSD_VERBOSE*/
+/* define this if you want to have the function names in output */
+/*#define CONFIG_DEVFSD_DEBUG*/
+
+#define BUFFER_SIZE 16384
+#define DEVFSD_VERSION "1.3.25"
+#define CONFIG_FILE "/etc/devfsd.conf"
+#define MAX_ARGS (6 + 1)
+#define MAX_SUBEXPR 10
+#define STRING_LENGTH 255
+
+/* for get_uid_gid() */
+#define UID 0
+#define GID 1
+
+/* for msg_logger(), do_ioctl(),
+ fork_and_execute() and xopendir(). */
+# define DIE 1
+# define NO_DIE 0
+
+/* Update only after changing code to reflect new protocol */
+#define DEVFSD_PROTOCOL_REVISION_DAEMON 5
+
+/* Compile-time check */
+#if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
+#error protocol version mismatch. Update your kernel headers
+#endif
+
+#define AC_PERMISSIONS 0
+#define AC_MODLOAD 1 /* not supported by busybox */
+#define AC_EXECUTE 2
+#define AC_MFUNCTION 3 /* not supported by busybox */
+#define AC_CFUNCTION 4 /* not supported by busybox */
+#define AC_COPY 5
+#define AC_IGNORE 6
+#define AC_MKOLDCOMPAT 7
+#define AC_MKNEWCOMPAT 8
+#define AC_RMOLDCOMPAT 9
+#define AC_RMNEWCOMPAT 10
+#define AC_RESTORE 11
+
+
+struct permissions_type
+{
+ mode_t mode;
+ uid_t uid;
+ gid_t gid;
+};
+
+struct execute_type
+{
+ char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
+};
+
+struct copy_type
+{
+ const char *source;
+ const char *destination;
+};
+
+struct action_type
+{
+ unsigned int what;
+ unsigned int when;
+};
+
+struct config_entry_struct
+{
+ struct action_type action;
+ regex_t preg;
+ union
+ {
+ struct permissions_type permissions;
+ struct execute_type execute;
+ struct copy_type copy;
+ }
+ u;
+ struct config_entry_struct *next;
+};
+
+struct get_variable_info
+{
+ const struct devfsd_notify_struct *info;
+ const char *devname;
+ char devpath[STRING_LENGTH];
+};
+
+static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *);
+static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
+static int mksymlink (const char *oldpath, const char *newpath);
+static void read_config_file (const char *path, int optional, unsigned long *event_mask);
+static void process_config_line (const char *, unsigned long *);
+static int do_servicing (int, unsigned long);
+static void service_name (const struct devfsd_notify_struct *);
+static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *);
+static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *,
+ const regmatch_t *, unsigned);
+static void action_copy (const struct devfsd_notify_struct *, const struct config_entry_struct *,
+ const regmatch_t *, unsigned);
+static void action_compat (const struct devfsd_notify_struct *, unsigned);
+static void free_config (void);
+static void do_restore (const char *, int);
+static int copy_inode (const char *, const struct stat *, mode_t, const char *, const struct stat *);
+static mode_t get_mode (const char *);
+static void signal_handler (int);
+static const char *get_variable (const char *, void *);
+static void do_scan_and_service (const char *);
+static int make_dir_tree (const char *);
+static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
+ const char *, const regmatch_t *, unsigned );
+static void expand_regexp (char *, size_t, const char *, const char *, const regmatch_t *, unsigned );
+static const char *expand_variable( char *, unsigned, unsigned *, const char *,
+ const char *(*) (const char *, void *), void * );
+static const char *get_variable_v2(const char *, const char *(*) (const char *, void *), void *);
+static char get_old_ide_name (unsigned , unsigned);
+static char *write_old_sd_name (char *, unsigned, unsigned, char *);
+
+/* busybox functions */
+static void msg_logger(int die, int pri, const char * fmt, ... );
+static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag);
+static void fork_and_execute(int die, char *arg0, char **arg );
+DIR * xopendir(int die, const char * dir_name);
+static int get_uid_gid ( int, const char *);
+static void safe_memcpy( char * dest, const char * src, int len);
+
+/* Structs and vars */
+static struct config_entry_struct *first_config = NULL;
+static struct config_entry_struct *last_config = NULL;
+static const char *mount_point = NULL;
+static volatile int caught_signal = FALSE;
+static volatile int caught_sighup = FALSE;
+static struct initial_symlink_struct
+{
+ char *dest;
+ char *name;
+} initial_symlinks[] =
+{
+ {"/proc/self/fd", "fd"},
+ {"fd/0", "stdin"},
+ {"fd/1", "stdout"},
+ {"fd/2", "stderr"},
+ {NULL, NULL},
+};
+
+static struct event_type
+{
+ unsigned int type; /* The DEVFSD_NOTIFY_* value */
+ const char *config_name; /* The name used in the config file */
+} event_types[] =
+{
+ {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
+ {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
+ {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
+ {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
+ {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
+ {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
+ {DEVFSD_NOTIFY_CREATE, "CREATE"},
+ {DEVFSD_NOTIFY_DELETE, "DELETE"},
+ {0xffffffff, NULL}
+};
+
+/* busybox functions and messages */
+
+extern void xregcomp(regex_t * preg, const char *regex, int cflags);
+
+const char * const bb_msg_bad_config = "bad %s config file: %s\n";
+const char * const bb_msg_proto_rev = "protocol revision";
+#ifdef CONFIG_DEVFSD_VERBOSE
+const char * const bb_msg_small_buffer = "buffer too small\n";
+const char * const bb_msg_variable_not_found= "variable: %s not found\n";
+#endif
+
+static void msg_logger(int die, int pri, const char * fmt, ... )
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ if (access ("/dev/log", F_OK) == 0)
+ {
+ openlog(bb_applet_name, 0, LOG_DAEMON);
+ vsyslog( pri , fmt , ap);
+ closelog();
+ }
+#ifndef CONFIG_DEVFSD_VERBOSE
+ else
+#endif
+ bb_verror_msg(fmt, ap);
+ va_end(ap);
+ if(die==DIE)
+ exit(EXIT_FAILURE);
+}
+
+
+static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag)
+{
+ if (ioctl (fd, request, event_mask_flag) != 0)
+ msg_logger(die, LOG_ERR, "ioctl() failed: %m\n");
+}
+
+static void fork_and_execute(int die, char *arg0, char **arg )
+{
+ switch ( fork () )
+ {
+ case 0:
+ /* Child */
+ break;
+ case -1:
+ /* Parent: Error : die or return */
+ msg_logger(die, LOG_ERR,(char *) bb_msg_memory_exhausted);
+ return;
+ default:
+ /* Parent : ok : return or exit */
+ if(arg0 != NULL)
+ {
+ wait (NULL);
+ return;
+ }
+ exit (EXIT_SUCCESS);
+ }
+ /* Child : if arg0 != NULL do execvp */
+ if(arg0 != NULL )
+ {
+ execvp (arg0, arg);
+ msg_logger(DIE, LOG_ERR, "execvp() failed: %s: %m\n", arg0);
+ }
+}
+
+
+DIR * xopendir(int die, const char * dir_name)
+{
+ DIR *dp;
+
+ if ( ( dp = opendir (dir_name) ) == NULL )
+ msg_logger( die, LOG_ERR, "opendir() failed: %s: %m\n", dir_name);
+ /* if die == DIE not reached else return NULL */
+ return dp;
+}
+
+static void safe_memcpy( char *dest, const char *src, int len)
+{
+ memcpy (dest , src , len );
+ dest[len] = '\0';
+}
+
+/* Public functions follow */
+
+int devfsd_main (int argc, char **argv)
+{
+ int print_version = FALSE;
+ int do_daemon = TRUE;
+ int no_polling = FALSE;
+ int fd, proto_rev, count;
+ unsigned long event_mask = 0;
+ struct sigaction new_action;
+ struct initial_symlink_struct *curr;
+
+ if (argc < 2)
+ bb_show_usage();
+
+ for (count = 2; count < argc; ++count)
+ {
+ if (strcmp (argv[count], "-v") == 0)
+ print_version = TRUE;
+ else if (strcmp (argv[count], "-fg") == 0)
+ do_daemon = FALSE;
+ else if (strcmp (argv[count], "-np") == 0)
+ no_polling = TRUE;
+ else
+ bb_show_usage();
+ }
+
+ mount_point = argv[1];
+
+ if (chdir (mount_point) != 0)
+ bb_error_msg_and_die( " %s: %m", mount_point);
+
+ fd = bb_xopen (".devfsd", O_RDONLY);
+
+ if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0)
+ bb_error_msg( "FD_CLOEXEC");
+
+ do_ioctl(DIE, fd, DEVFSDIOC_GET_PROTO_REV,(int )&proto_rev);
+
+ /*setup initial entries */
+ for (curr = initial_symlinks; curr->dest != NULL; ++curr)
+ symlink (curr->dest, curr->name);
+
+ /* NB: The check for CONFIG_FILE is done in read_config_file() */
+
+ if ( print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) )
+ {
+ bb_printf( "%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
+ bb_applet_name,DEVFSD_VERSION,bb_msg_proto_rev,
+ DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev);
+ if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
+ bb_error_msg_and_die( "%s mismatch!",bb_msg_proto_rev);
+ exit(EXIT_SUCCESS); /* -v */
+ }
+ /* Tell kernel we are special (i.e. we get to see hidden entries) */
+ do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, 0);
+
+ sigemptyset (&new_action.sa_mask);
+ new_action.sa_flags = 0;
+
+ /* Set up SIGHUP and SIGUSR1 handlers */
+ new_action.sa_handler = signal_handler;
+ if (sigaction (SIGHUP, &new_action, NULL) != 0 || sigaction (SIGUSR1, &new_action, NULL) != 0 )
+ bb_error_msg_and_die( "sigaction()");
+
+ bb_printf("%s v%s started for %s\n",bb_applet_name, DEVFSD_VERSION, mount_point);
+
+ /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
+ umask (0);
+ read_config_file (CONFIG_FILE, FALSE, &event_mask);
+ /* Do the scan before forking, so that boot scripts see the finished product */
+ do_scan_and_service (mount_point);
+ if (no_polling)
+ exit (0);
+ if (do_daemon)
+ {
+ /* Release so that the child can grab it */
+ do_ioctl(DIE, fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
+ fork_and_execute(DIE, NULL, NULL);
+ setsid (); /* Prevent hangups and become pgrp leader */
+ }
+ else
+ setpgid (0, 0); /* Become process group leader */
+
+ while (TRUE)
+ {
+ int do_scan = do_servicing (fd, event_mask);
+
+ free_config ();
+ read_config_file (CONFIG_FILE, FALSE, &event_mask);
+ if (do_scan)
+ do_scan_and_service (mount_point);
+ }
+} /* End Function main */
+
+
+/* Private functions follow */
+
+static void read_config_file (const char *path, int optional, unsigned long *event_mask)
+/* [SUMMARY] Read a configuration database.
+ <path> The path to read the database from. If this is a directory, all
+ entries in that directory will be read (except hidden entries).
+ <optional> If TRUE, the routine will silently ignore a missing config file.
+ <event_mask> The event mask is written here. This is not initialised.
+ [RETURNS] Nothing.
+*/
+{
+ struct stat statbuf;
+ FILE *fp;
+ char buf[STRING_LENGTH];
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "read_config_file()\n");
+#endif
+
+ if (stat (path, &statbuf) != 0 || statbuf.st_size == 0 )
+ msg_logger((optional == 0 )? DIE : NO_DIE, LOG_ERR, " %s: %m\n", path);
+
+ if ( S_ISDIR (statbuf.st_mode) )
+ {
+
+ DIR *dp;
+ struct dirent *de;
+
+ dp = xopendir(DIE, path);
+
+ while ( ( de = readdir (dp) ) != NULL )
+ {
+ char fname[STRING_LENGTH];
+
+ if (de->d_name[0] == '.')
+ continue;
+ snprintf (fname, STRING_LENGTH, "%s/%s", path, de->d_name);
+ read_config_file (fname, optional, event_mask);
+ }
+ closedir (dp);
+ return;
+ }
+
+ if ( ( fp = fopen (path, "r") ) != NULL )
+ {
+ while (fgets (buf, STRING_LENGTH, fp) != NULL)
+ {
+ char *line;
+
+ buf[strlen (buf) - 1] = '\0';
+ /* Skip whitespace */
+ for (line = buf; isspace (*line); ++line)
+ /*VOID*/;
+ if (line[0] == '\0' || line[0] == '#' )
+ continue;
+ process_config_line (line, event_mask);
+ }
+ fclose (fp);
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO, "read config file: %s\n", path);
+#endif
+ return;
+ }
+ msg_logger(( (optional == 0) && (errno == ENOENT) )? DIE : NO_DIE, LOG_ERR, " %s: %m\n", path);
+} /* End Function read_config_file */
+
+static void process_config_line (const char *line, unsigned long *event_mask)
+/* [SUMMARY] Process a line from a configuration file.
+ <line> The configuration line.
+ <event_mask> The event mask is written here. This is not initialised.
+ [RETURNS] Nothing.
+*/
+{
+ int num_args, count;
+ struct config_entry_struct *new;
+ char p[MAX_ARGS][STRING_LENGTH];
+ char when[STRING_LENGTH], what[STRING_LENGTH];
+ char name[STRING_LENGTH];
+ char * msg="";
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "process_config_line()\n");
+#endif
+
+ for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0';
+ num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s",
+ when, name, what,
+ p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
+ if (strcasecmp (when, "CLEAR_CONFIG") == 0)
+ {
+ free_config ();
+ *event_mask = 0;
+ return;
+ }
+ if (num_args < 2)
+ goto process_config_line_err;
+
+ if ( (strcasecmp (when, "INCLUDE") == 0) ||
+ (strcasecmp (when, "OPTIONAL_INCLUDE") == 0) )
+ {
+ st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL );
+ read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask);
+ return;
+ }
+ if (strcasecmp (when, "RESTORE") == 0)
+ {
+ do_restore ( name, strlen (name) );
+ return;
+ }
+ if (num_args < 3)
+ goto process_config_line_err;
+
+ new = xmalloc (sizeof *new);
+ memset (new, 0, sizeof *new);
+
+ for (count = 0; event_types[count].config_name != NULL; ++count)
+ {
+ if (strcasecmp (when, event_types[count].config_name) != 0)
+ continue;
+ new->action.when = event_types[count].type;
+ break;
+ }
+ if (event_types[count].config_name == NULL)
+ {
+ msg="WHEN in";
+ goto process_config_line_err;
+ }
+
+ if (strcasecmp (what, "PERMISSIONS") == 0)
+ {
+ char *ptr;
+
+ new->action.what = AC_PERMISSIONS;
+ /* Get user and group */
+ if ( ( ptr = strchr (p[0], '.') ) == NULL )
+ {
+ msg="UID.GID";
+ goto process_config_line_err; /*"missing '.' in UID.GID */
+ }
+
+ *ptr++ = '\0';
+ new->u.permissions.uid = get_uid_gid (UID, p[0]);
+ new->u.permissions.gid = get_uid_gid (GID, ptr);
+ /* Get mode */
+ new->u.permissions.mode = get_mode (p[1]);
+ }
+ else if (strcasecmp (what, "EXECUTE") == 0)
+ {
+ new->action.what = AC_EXECUTE;
+ num_args -= 3;
+
+ for (count = 0; count < num_args; ++count)
+ new->u.execute.argv[count] = bb_xstrdup (p[count]);
+
+ new->u.execute.argv[num_args] = NULL;
+ }
+ else if (strcasecmp (what, "COPY") == 0)
+ {
+ new->action.what = AC_COPY;
+ num_args -= 3;
+ if (num_args != 2)
+ goto process_config_line_err; /* missing path and function in line */
+
+ new->u.copy.source = bb_xstrdup (p[0]);
+ new->u.copy.destination = bb_xstrdup (p[1]);
+ }
+ else if (strcasecmp (what, "IGNORE") == 0)
+ new->action.what = AC_IGNORE;
+ else if (strcasecmp (what, "MKOLDCOMPAT") == 0)
+ new->action.what = AC_MKOLDCOMPAT;
+ else if (strcasecmp (what, "MKNEWCOMPAT") == 0)
+ new->action.what = AC_MKNEWCOMPAT;
+ else if (strcasecmp (what, "RMOLDCOMPAT") == 0)
+ new->action.what = AC_RMOLDCOMPAT;
+ else if (strcasecmp (what, "RMNEWCOMPAT") == 0)
+ new->action.what = AC_RMNEWCOMPAT;
+ else
+ {
+ msg ="WHAT in";
+ goto process_config_line_err;
+ }
+
+ xregcomp( &new->preg, name, REG_EXTENDED);
+
+ *event_mask |= 1 << new->action.when;
+ new->next = NULL;
+ if (first_config == NULL)
+ first_config = new;
+ else
+ last_config->next = new;
+ last_config = new;
+ return;
+process_config_line_err:
+ msg_logger( DIE, LOG_ERR, bb_msg_bad_config, msg , line);
+} /* End Function process_config_line */
+
+static int do_servicing (int fd, unsigned long event_mask)
+/* [SUMMARY] Service devfs changes until a signal is received.
+ <fd> The open control file.
+ <event_mask> The event mask.
+ [RETURNS] TRUE if SIGHUP was caught, else FALSE.
+*/
+{
+ ssize_t bytes;
+ struct devfsd_notify_struct info;
+ unsigned long tmp_event_mask;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "do_servicing()\n");
+#endif
+ /* Tell devfs what events we care about */
+ tmp_event_mask = event_mask;
+ /* May need to trap inode creates to watch for syslogd(8) starting */
+ /*if (!syslog_is_open && !no_syslog)
+ {
+ tmp_event_mask |= 1 << DEVFSD_NOTIFY_CREATE; *//*FIXME I'm not sure if this line is needed. TITO */
+ /*}*/
+ do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
+ while (!caught_signal)
+ {
+ errno = 0;
+ bytes = read (fd, (char *) &info, sizeof info);
+ if (caught_signal)
+ break; /* Must test for this first */
+ if (errno == EINTR)
+ continue; /* Yes, the order is important */
+ if (bytes < 1)
+ break;
+ /* Special trap for "/dev/log" creation */
+ /* Open syslog, now that "/dev/log" exists */
+ /*if (!syslog_is_open && !no_syslog &&
+ (info.type == DEVFSD_NOTIFY_CREATE) &&(strcmp (info.devname, "log") == 0) )
+ {
+ do_open_syslog ();
+ do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, event_mask);*/ /*FIXME I'm not sure if this line is needed. TITO */
+ /*}*/
+ service_name (&info);
+ }
+ if (caught_signal)
+ {
+ int c_sighup = caught_sighup;
+
+ caught_signal = FALSE;
+ caught_sighup = FALSE;
+ return (c_sighup);
+ }
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_ERR, "read error on control file: %m\n");
+#endif
+ /* This is to shut up a compiler warning */
+ exit(1);
+} /* End Function do_servicing */
+
+static void service_name (const struct devfsd_notify_struct *info)
+/* [SUMMARY] Service a single devfs change.
+ <info> The devfs change.
+ [RETURNS] Nothing.
+*/
+{
+ unsigned int n;
+ regmatch_t mbuf[MAX_SUBEXPR];
+ struct config_entry_struct *entry;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "service_name()\n");
+#endif
+#ifdef CONFIG_DEVFSD_VERBOSE
+ if (info->overrun_count > 0)
+ msg_logger( NO_DIE, LOG_ERR, "lost %u events\n", info->overrun_count);
+#endif
+
+ /* Discard lookups on "/dev/log" and "/dev/initctl" */
+ if (info->type == DEVFSD_NOTIFY_LOOKUP &&
+ (( (strcmp (info->devname, "log") == 0) ||
+ (strcmp (info->devname, "initctl") == 0))))
+ return;
+ for (entry = first_config; entry != NULL; entry = entry->next)
+ {
+ /* First check if action matches the type, then check if name matches */
+ if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 )
+ continue;
+ for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
+ /* VOID */;
+ switch (entry->action.what)
+ {
+ case AC_PERMISSIONS:
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "AC_PERMISSIONS\n");
+#endif
+ action_permissions (info, entry);
+ break;
+ case AC_EXECUTE:
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "AC_EXECUTE\n");
+#endif
+ action_execute (info, entry, mbuf, n);
+ break;
+ case AC_COPY:
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "AC_COPY\n");
+#endif
+ action_copy (info, entry, mbuf, n);
+ break;
+ case AC_IGNORE:
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "AC_IGNORE\n");
+#endif
+ return;
+ /*break;*/
+ case AC_MKOLDCOMPAT:
+ case AC_MKNEWCOMPAT:
+ case AC_RMOLDCOMPAT:
+ case AC_RMNEWCOMPAT:
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "AC_COMPAT\n");
+#endif
+ action_compat (info, entry->action.what);
+ break;
+ default:
+ msg_logger( DIE, LOG_ERR, "Unknown action\n");
+ /*break;*/
+ }
+ }
+} /* End Function service_name */
+
+static void action_permissions (const struct devfsd_notify_struct *info,
+ const struct config_entry_struct *entry)
+/* [SUMMARY] Update permissions for a device entry.
+ <info> The devfs change.
+ <entry> The config file entry.
+ [RETURNS] Nothing.
+*/
+{
+ struct stat statbuf;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "action_permission()\n");
+#endif
+
+ if ( stat (info->devname, &statbuf) != 0 ||
+ chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 ||
+ chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0)
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_ERR, "chmod() or chown() error for: %s: %m\n",info->devname);
+#endif
+ return;
+ }
+
+} /* End Function action_permissions */
+
+static void action_execute (const struct devfsd_notify_struct *info,
+ const struct config_entry_struct *entry,
+ const regmatch_t *regexpr, unsigned int numexpr)
+/* [SUMMARY] Execute a programme.
+ <info> The devfs change.
+ <entry> The config file entry.
+ <regexpr> The number of subexpression (start, end) offsets within the
+ device name.
+ <numexpr> The number of elements within <<regexpr>>.
+ [RETURNS] Nothing.
+*/
+{
+ unsigned int count;
+ struct get_variable_info gv_info;
+ char *argv[MAX_ARGS + 1];
+ char largv[MAX_ARGS + 1][STRING_LENGTH];
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "action_execute()\n");
+#endif
+
+ gv_info.info = info;
+ gv_info.devname = info->devname;
+ snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
+ for (count = 0; entry->u.execute.argv[count] != NULL; ++count)
+ {
+ expand_expression (largv[count], STRING_LENGTH,
+ entry->u.execute.argv[count],
+ get_variable, &gv_info,
+ gv_info.devname, regexpr, numexpr );
+ argv[count] = largv[count];
+ }
+ argv[count] = NULL;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ int i;
+ char buff[1024];
+
+ buff[0]='\0';
+ for(i=0;argv[i]!=NULL;i++) /* argv[i] < MAX_ARGS + 1 */
+ {
+ strcat(buff," ");
+ if( (strlen(buff)+ 1 + strlen(argv[i])) >= 1024)
+ break;
+ strcat(buff,argv[i]);
+ }
+ strcat(buff,"\n");
+ msg_logger( NO_DIE, LOG_INFO, "action_execute(): %s",buff);
+#endif
+
+ fork_and_execute(NO_DIE, argv[0], argv);
+} /* End Function action_execute */
+
+
+static void action_copy (const struct devfsd_notify_struct *info,
+ const struct config_entry_struct *entry,
+ const regmatch_t *regexpr, unsigned int numexpr)
+/* [SUMMARY] Copy permissions.
+ <info> The devfs change.
+ <entry> The config file entry.
+ <regexpr> This list of subexpression (start, end) offsets within the
+ device name.
+ <numexpr> The number of elements in <<regexpr>>.
+ [RETURNS] Nothing.
+*/
+{
+ mode_t new_mode;
+ struct get_variable_info gv_info;
+ struct stat source_stat, dest_stat;
+ char source[STRING_LENGTH], destination[STRING_LENGTH];
+ dest_stat.st_mode = 0;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "action_copy()\n");
+#endif
+
+ if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) )
+ return;
+ gv_info.info = info;
+ gv_info.devname = info->devname;
+ snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
+
+ expand_expression (source, STRING_LENGTH, entry->u.copy.source,
+ get_variable, &gv_info, gv_info.devname,
+ regexpr, numexpr);
+
+ expand_expression (destination, STRING_LENGTH, entry->u.copy.destination,
+ get_variable, &gv_info, gv_info.devname,
+ regexpr, numexpr);
+
+ if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0)
+ goto action_copy_error;
+
+ lstat (destination, &dest_stat);
+ new_mode = source_stat.st_mode & ~S_ISVTX;
+ if (info->type == DEVFSD_NOTIFY_CREATE)
+ new_mode |= S_ISVTX;
+ else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) )
+ new_mode |= S_ISVTX;
+#ifdef CONFIG_DEVFSD_VERBOSE
+ if ( !copy_inode (destination, &dest_stat, new_mode, source, &source_stat) )
+action_copy_error:
+ msg_logger( NO_DIE, LOG_ERR, "error copying: %s to %s: %m\n", source, destination);
+#else
+ copy_inode (destination, &dest_stat, new_mode, source,&source_stat);
+action_copy_error:
+ return;
+#endif
+} /* End Function action_copy */
+
+static void action_compat (const struct devfsd_notify_struct *info,
+ unsigned int action)
+/* [SUMMARY] Process a compatibility request.
+ <info> The devfs change.
+ <action> The action to take.
+ [RETURNS] Nothing.
+*/
+{
+ const char *compat_name = NULL;
+ const char *dest_name = info->devname;
+ char *ptr;
+ char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "action_compat()\n");
+#endif
+
+ /* First construct compatibility name */
+ switch (action)
+ {
+ case AC_MKOLDCOMPAT:
+ case AC_RMOLDCOMPAT:
+ compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor);
+ break;
+ case AC_MKNEWCOMPAT:
+ case AC_RMNEWCOMPAT:
+ if (strncmp (info->devname, "scsi/", 5) == 0)
+ {
+ int mode, host, bus, target, lun;
+
+ sscanf (info->devname + 5, "host%d/bus%d/target%d/lun%d/",
+ &host, &bus, &target, &lun);
+ compat_name = compat_buf;
+ snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname);
+ dest_name = dest_buf;
+ if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "mt", 2)== 0)
+ {
+ char rewind_ = info->devname[info->namelen - 1];
+
+ if (rewind_ != 'n')
+ rewind_ = '\0';
+
+ switch (ptr[2])
+ {
+ default:
+ mode = 0;
+ break;
+ case 'l':
+ mode = 1;
+ break;
+ case 'm':
+ mode = 2;
+ break;
+ case 'a':
+ mode = 3;
+ break;
+ }
+ sprintf (compat_buf, "st/c%db%dt%du%dm%d%c", host, bus, target, lun, mode, rewind_);
+ }
+ else if (strcmp (info->devname + info->namelen - 7,"generic") == 0)
+ sprintf (compat_buf, "sg/c%db%dt%du%d",
+ host, bus, target, lun);
+ else if (strcmp (info->devname + info->namelen - 2, "cd") == 0)
+ sprintf (compat_buf, "sr/c%db%dt%du%d",
+ host, bus, target, lun);
+ else if (strcmp (info->devname + info->namelen - 4, "disc") == 0)
+ sprintf (compat_buf, "sd/c%db%dt%du%d",
+ host, bus, target, lun);
+ else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "part", 4) == 0)
+ sprintf ( compat_buf, "sd/c%db%dt%du%dp%d",
+ host, bus, target, lun, atoi (ptr + 4) );
+ else compat_name = NULL;
+ }
+ else if (strncmp (info->devname, "ide/host", 8) == 0)
+ {
+ int host, bus, target, lun;
+
+ sscanf (info->devname + 4, "host%d/bus%d/target%d/lun%d/",
+ &host, &bus, &target, &lun);
+ compat_name = compat_buf;
+ snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + 4);
+ dest_name = dest_buf;
+ if (strcmp (info->devname + info->namelen - 4, "disc") == 0)
+ sprintf (compat_buf, "ide/hd/c%db%dt%du%d",
+ host, bus, target, lun);
+ else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "part", 4) == 0)
+ sprintf ( compat_buf, "ide/hd/c%db%dt%du%dp%d",
+ host, bus, target, lun, atoi (ptr + 4) );
+ else if (strcmp (info->devname + info->namelen - 2, "cd") == 0)
+ sprintf (compat_buf, "ide/cd/c%db%dt%du%d",
+ host, bus, target,lun);
+ else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "mt", 2) == 0)
+ snprintf (compat_buf, sizeof (compat_buf), "ide/mt/c%db%dt%du%d%s",
+ host, bus, target, lun, ptr + 2);
+ else compat_name = NULL;
+ }
+ break;
+ }
+ if (compat_name == NULL)
+ return;
+ /* Now decide what to do with it */
+ switch (action)
+ {
+ case AC_MKOLDCOMPAT:
+ case AC_MKNEWCOMPAT:
+ mksymlink (dest_name, compat_name);
+ break;
+ case AC_RMOLDCOMPAT:
+ case AC_RMNEWCOMPAT:
+#ifdef CONFIG_DEVFSD_VERBOSE
+ if (unlink (compat_name) != 0)
+ msg_logger( NO_DIE, LOG_ERR, "unlink(): %s: %m\n", compat_name);
+#else
+ unlink (compat_name);
+#endif
+ break;
+ }
+} /* End Function action_compat */
+
+static void do_restore (const char *dir_name, int rootlen)
+/* [SUMMARY] Restore state from a directory.
+ <dir_name> The directory containing the backing store.
+ <rootlen> The length of the root of the state directory hierarchy.
+ [RETURNS] Nothing.
+*/
+{
+ DIR *dp;
+ struct dirent *de;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "do_restore()\n");
+#endif
+
+ if( (dp = xopendir(NO_DIE, dir_name))== NULL)
+ return;
+
+ while ( (de = readdir (dp) ) != NULL )
+ {
+ char spath[STRING_LENGTH], dpath[STRING_LENGTH];
+
+ struct stat source_stat, dest_stat;
+ dest_stat.st_mode = 0;
+
+ if ( (strcmp (de->d_name, ".") == 0) || (strcmp (de->d_name, "..") == 0) )
+ continue;
+
+ snprintf (spath, sizeof spath, "%s/%s", dir_name, de->d_name);
+
+ if (lstat (spath, &source_stat) != 0)
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_ERR, "%s: %m\n", spath);
+#endif
+ continue;
+ }
+ snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen);
+ lstat (dpath, &dest_stat);
+
+ if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) )
+ copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
+
+ if ( S_ISDIR (source_stat.st_mode) )
+ do_restore (spath, rootlen);
+ }
+ closedir (dp);
+} /* End Function do_restore */
+
+static int copy_inode (const char *destpath, const struct stat *dest_stat,
+ mode_t new_mode,
+ const char *sourcepath, const struct stat *source_stat)
+/* [SUMMARY] Copy an inode.
+ <destpath> The destination path. An existing inode may be deleted.
+ <dest_stat> The destination stat(2) information.
+ <new_mode> The desired new mode for the destination.
+ <sourcepath> The source path.
+ <source_stat> The source stat(2) information.
+ [RETURNS] TRUE on success, else FALSE.
+*/
+{
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "copy_inode()\n");
+#endif
+
+ if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) )
+ {
+ /* Same type */
+ if ( S_ISLNK (source_stat->st_mode) )
+ {
+ int source_len, dest_len;
+ char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
+
+
+ if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 ||
+ ( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 )
+ return (FALSE);
+ source_link[source_len] = '\0';
+ dest_link[dest_len] = '\0';
+ if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) )
+ {
+ unlink (destpath);
+ symlink (source_link, destpath);
+ }
+ return (TRUE);
+ } /* Else not a symlink */
+ chmod (destpath, new_mode & ~S_IFMT);
+ chown (destpath, source_stat->st_uid, source_stat->st_gid);
+ return (TRUE);
+ }
+ /* Different types: unlink and create */
+ unlink (destpath);
+ switch (source_stat->st_mode & S_IFMT)
+ {
+ int fd, val;
+ struct sockaddr_un un_addr;
+ char symlink_val[STRING_LENGTH];
+
+ case S_IFSOCK:
+ if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 )
+ break;
+ un_addr.sun_family = AF_UNIX;
+ snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath);
+ val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr);
+ close (fd);
+ if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0)
+ break;
+ if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
+ return (TRUE);
+ break;
+ case S_IFLNK:
+ if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 )
+ break;
+ symlink_val[val] = '\0';
+ if (symlink (symlink_val, destpath) == 0)
+ return (TRUE);
+ break;
+ case S_IFREG:
+ if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 )
+ break;
+ close (fd);
+ if (chmod (destpath, new_mode & ~S_IFMT) != 0)
+ break;
+ if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
+ return (TRUE);
+ break;
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFIFO:
+ if (mknod (destpath, new_mode, source_stat->st_rdev) != 0)
+ break;
+ if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
+ return (TRUE);
+ break;
+ case S_IFDIR:
+ if (mkdir (destpath, new_mode & ~S_IFMT) != 0)
+ break;
+ if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
+ return (TRUE);
+ return (TRUE);
+ /*break;*/
+ }
+ return (FALSE);
+} /* End Function copy_inode */
+
+static void free_config ()
+/* [SUMMARY] Free the configuration information.
+ [RETURNS] Nothing.
+*/
+{
+ struct config_entry_struct *c_entry;
+ void *next;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "free_config()\n");
+#endif
+
+ for (c_entry = first_config; c_entry != NULL; c_entry = next)
+ {
+ unsigned int count;
+
+ next = c_entry->next;
+ regfree (&c_entry->preg);
+ if (c_entry->action.what == AC_EXECUTE)
+ {
+ for (count = 0; count < MAX_ARGS; ++count)
+ {
+ if (c_entry->u.execute.argv[count] == NULL)
+ break;
+ free (c_entry->u.execute.argv[count]);
+ }
+ }
+ free (c_entry);
+ }
+ first_config = NULL;
+ last_config = NULL;
+} /* End Function free_config */
+
+static int get_uid_gid (int flag, const char *string)
+/* [SUMMARY] Convert a string to a UID or GID value.
+ <flag> "UID" or "GID".
+ <string> The string.
+ [RETURNS] The UID or GID value.
+*/
+{
+ struct passwd *pw_ent;
+ struct group *grp_ent;
+ char * msg_a="user";
+ char * msg_b="U";
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "get_uid_gid()\n");
+
+
+ if(flag != UID && flag != GID )
+ msg_logger( DIE, LOG_ERR,"flag != UID && flag != GID\n");
+#endif
+
+ if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) )
+ return atoi (string);
+
+ if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL )
+ return (pw_ent->pw_uid);
+
+ if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL )
+ return (grp_ent->gr_gid);
+ else
+ {
+ msg_a="group";
+ msg_b="G";
+ }
+
+ msg_logger( NO_DIE, LOG_ERR,"unknown %s: %s, defaulting to %cID=0\n", msg_a, string, msg_b);
+ return (0);
+}/* End Function get_uid_gid */
+
+static mode_t get_mode (const char *string)
+/* [SUMMARY] Convert a string to a mode value.
+ <string> The string.
+ [RETURNS] The mode value.
+*/
+{
+ mode_t mode;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "get_mode()\n");
+#endif
+
+ if ( isdigit (string[0]) )
+ return strtoul (string, NULL, 8);
+ if (strlen (string) != 9)
+ msg_logger( DIE, LOG_ERR, "bad mode: %s\n", string);
+ mode = 0;
+ if (string[0] == 'r') mode |= S_IRUSR;
+ if (string[1] == 'w') mode |= S_IWUSR;
+ if (string[2] == 'x') mode |= S_IXUSR;
+ if (string[3] == 'r') mode |= S_IRGRP;
+ if (string[4] == 'w') mode |= S_IWGRP;
+ if (string[5] == 'x') mode |= S_IXGRP;
+ if (string[6] == 'r') mode |= S_IROTH;
+ if (string[7] == 'w') mode |= S_IWOTH;
+ if (string[8] == 'x') mode |= S_IXOTH;
+ return (mode);
+} /* End Function get_mode */
+
+static void signal_handler (int sig)
+{
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "signal_handler()\n");
+#endif
+
+ caught_signal = TRUE;
+ if (sig == SIGHUP)
+ caught_sighup = TRUE;
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO, "Caught %s\n",(sig == SIGHUP)?"SIGHUP" : "SIGUSR1");
+#endif
+} /* End Function signal_handler */
+
+static const char *get_variable (const char *variable, void *info)
+{
+ struct get_variable_info *gv_info = info;
+ static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH];
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "get_variable()\n");
+#endif
+
+ if (gethostname (hostname, STRING_LENGTH - 1) != 0)
+ msg_logger( DIE, LOG_ERR, "gethostname(): %m\n");
+ /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
+ hostname[STRING_LENGTH - 1] = '\0';
+ if (strcmp (variable, "hostname") == 0)
+ return (hostname);
+ if (strcmp (variable, "mntpnt") == 0)
+ return (mount_point);
+ if (gv_info == NULL)
+ return (NULL);
+ if (strcmp (variable, "devpath") == 0)
+ return (gv_info->devpath);
+ if (strcmp (variable, "devname") == 0)
+ return (gv_info->devname);
+ if (strcmp (variable, "mode") == 0)
+ {
+ sprintf (sbuf, "%o", gv_info->info->mode);
+ return (sbuf);
+ }
+ if (strcmp (variable, "uid") == 0)
+ {
+ sprintf (sbuf, "%u", gv_info->info->uid);
+ return (sbuf);
+ }
+ if (strcmp (variable, "gid") == 0)
+ {
+ sprintf (sbuf, "%u", gv_info->info->gid);
+ return (sbuf);
+ }
+ return (NULL);
+} /* End Function get_variable */
+
+static void do_scan_and_service (const char *dir_name)
+/* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
+ <dp> The directory pointer. This is closed upon completion.
+ <dir_name> The name of the directory.
+ [RETURNS] Nothing.
+*/
+{
+ struct stat statbuf;
+ DIR *dp;
+ struct dirent *de;
+ char path[STRING_LENGTH];
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "do_scan_and_service ()\n");
+#endif
+
+ if((dp = xopendir(NO_DIE, dir_name))==NULL)
+ return;
+
+ while ( (de = readdir (dp) ) != NULL )
+ {
+ struct devfsd_notify_struct info;
+
+ if ( (strcmp (de->d_name, ".") == 0) || (strcmp (de->d_name, "..") == 0) )
+ continue;
+ snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name);
+ if (lstat (path, &statbuf) != 0)
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_ERR, "%s: %m\n", path);
+#endif
+ continue;
+ }
+ memset (&info, 0, sizeof info);
+ info.type = DEVFSD_NOTIFY_REGISTERED;
+ info.mode = statbuf.st_mode;
+ info.major = MAJOR (statbuf.st_rdev);
+ info.minor = MINOR (statbuf.st_rdev);
+ info.uid = statbuf.st_uid;
+ info.gid = statbuf.st_gid;
+ snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1);
+ info.namelen = strlen (info.devname);
+ service_name (&info);
+ if ( S_ISDIR (statbuf.st_mode) )
+ do_scan_and_service (path);
+ }
+ closedir (dp);
+} /* End Function do_scan_and_service */
+
+static int mksymlink (const char *oldpath, const char *newpath)
+/* [SUMMARY] Create a symlink, creating intervening directories as required.
+ <oldpath> The string contained in the symlink.
+ <newpath> The name of the new symlink.
+ [RETURNS] 0 on success, else -1.
+*/
+{
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "mksymlink()\n", newpath);
+#endif
+
+
+ if ( !make_dir_tree (newpath) )
+ return (-1);
+
+ if (symlink (oldpath, newpath) != 0)
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ if (errno == EEXIST)
+ msg_logger( NO_DIE, LOG_INFO, "symlink(): %s: already exists\n", newpath);
+ else
+ {
+ msg_logger( NO_DIE, LOG_ERR, "symlink(): %s: %m\n", newpath);
+ return (-1);
+ }
+#else
+ if (errno != EEXIST)
+ return (-1);
+#endif
+ }
+ return (0);
+} /* End Function mksymlink */
+
+
+static int make_dir_tree (const char *path)
+/* [SUMMARY] Creating intervening directories for a path as required.
+ <path> The full pathname (including he leaf node).
+ [RETURNS] TRUE on success, else FALSE.
+*/
+{
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "make_dir_tree()\n");
+#endif
+
+ if (bb_make_directory( (char *)path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH , FILEUTILS_RECUR )==-1)
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_ERR, "make_dir_tree(): %s: %m\n", path);
+#endif
+ return (FALSE);
+ }
+ return(TRUE);
+} /* End Function make_dir_tree */
+
+static int expand_expression(char *output, unsigned int outsize,
+ const char *input,
+ const char *(*get_variable_func)(const char *variable, void *info),
+ void *info,
+ const char *devname,
+ const regmatch_t *ex, unsigned int numexp)
+/* [SUMMARY] Expand enviroment variables and regular subexpressions in string.
+ <output> The output expanded expression is written here.
+ <length> The size of the output buffer.
+ <input> The input expression. This may equal <<output>>.
+ <get_variable> A function which will be used to get variable values. If
+ this returns NULL, the environment is searched instead. If this is NULL,
+ only the environment is searched.
+ <info> An arbitrary pointer passed to <<get_variable>>.
+ <devname> Device name; specifically, this is the string that contains all
+ of the regular subexpressions.
+ <ex> Array of start / end offsets into info->devname for each subexpression
+ <numexp> Number of regular subexpressions found in <<devname>>.
+ [RETURNS] TRUE on success, else FALSE.
+*/
+{
+ char temp[STRING_LENGTH];
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "expand_expression()\n");
+#endif
+
+ if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) )
+ return (FALSE);
+ expand_regexp (output, outsize, temp, devname, ex, numexp);
+ return (TRUE);
+} /* End Function expand_expression */
+
+static void expand_regexp (char *output, size_t outsize, const char *input,
+ const char *devname,
+ const regmatch_t *ex, unsigned int numex )
+/* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
+ <output> The output expanded expression is written here.
+ <outsize> The size of the output buffer.
+ <input> The input expression. This may NOT equal <<output>>, because
+ supporting that would require yet another string-copy. However, it's not
+ hard to write a simple wrapper function to add this functionality for those
+ few cases that need it.
+ <devname> Device name; specifically, this is the string that contains all
+ of the regular subexpressions.
+ <ex> An array of start and end offsets into <<devname>>, one for each
+ subexpression
+ <numex> Number of subexpressions in the offset-array <<ex>>.
+ [RETURNS] Nothing.
+*/
+{
+ const char last_exp = '0' - 1 + numex;
+ int c = -1;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "expand_regexp()\n");
+#endif
+
+ /* Guarantee NULL termination by writing an explicit '\0' character into
+ the very last byte */
+ if (outsize)
+ output[--outsize] = '\0';
+ /* Copy the input string into the output buffer, replacing '\\' with '\'
+ and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
+ codes are deleted */
+ while ( (c != '\0') && (outsize != 0) )
+ {
+ c = *input;
+ ++input;
+ if (c == '\\')
+ {
+ c = *input;
+ ++input;
+ if (c != '\\')
+ {
+ if ((c >= '0') && (c <= last_exp))
+ {
+ const regmatch_t *subexp = ex + (c - '0');
+ unsigned int sublen = subexp->rm_eo - subexp->rm_so;
+
+ /* Range checking */
+ if (sublen > outsize)
+ sublen = outsize;
+ strncpy (output, devname + subexp->rm_so, sublen);
+ output += sublen;
+ outsize -= sublen;
+ }
+ continue;
+ }
+ }
+ *output = c;
+ ++output;
+ --outsize;
+ } /* while */
+} /* End Function expand_regexp */
+
+
+/* from compat_name.c */
+
+struct translate_struct
+{
+ char *match; /* The string to match to (up to length) */
+ char *format; /* Format of output, "%s" takes data past match string,
+ NULL is effectively "%s" (just more efficient) */
+};
+
+static struct translate_struct translate_table[] =
+{
+ {"sound/", NULL},
+ {"printers/", "lp%s"},
+ {"v4l/", NULL},
+ {"parports/", "parport%s"},
+ {"fb/", "fb%s"},
+ {"netlink/", NULL},
+ {"loop/", "loop%s"},
+ {"floppy/", "fd%s"},
+ {"rd/", "ram%s"},
+ {"md/", "md%s"}, /* Meta-devices */
+ {"vc/", "tty%s"},
+ {"misc/", NULL},
+ {"isdn/", NULL},
+ {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
+ {"i2c/", "i2c-%s"},
+ {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
+ {"tts/E", "ttyE%s"}, /* Stallion serial driver */
+ {"cua/E", "cue%s"}, /* Stallion serial driver callout */
+ {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
+ {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
+ {"ip2/", "ip2%s"}, /* Computone serial driver control */
+ {"tts/F", "ttyF%s"}, /* Computone serial driver */
+ {"cua/F", "cuf%s"}, /* Computone serial driver callout */
+ {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
+ {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
+ {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
+ {"cua/", "cua%s"}, /* Generic serial: must be after others */
+ {"input/js", "js%s"}, /* Joystick driver */
+ {NULL, NULL}
+};
+
+const char *get_old_name (const char *devname, unsigned int namelen,
+ char *buffer, unsigned int major, unsigned int minor)
+/* [SUMMARY] Translate a kernel-supplied name into an old name.
+ <devname> The device name provided by the kernel.
+ <namelen> The length of the name.
+ <buffer> A buffer that may be used. This should be at least 128 bytes long.
+ <major> The major number for the device.
+ <minor> The minor number for the device.
+ [RETURNS] A pointer to the old name if known, else NULL.
+*/
+{
+ const char *compat_name = NULL;
+ char *ptr;
+ struct translate_struct *trans;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "get_old_name()\n");
+#endif
+
+ for (trans = translate_table; trans->match != NULL; ++trans)
+ {
+ size_t len = strlen (trans->match);
+
+ if (strncmp (devname, trans->match, len) == 0)
+ {
+ if (trans->format == NULL)
+ return (devname + len);
+ sprintf (buffer, trans->format, devname + len);
+ return (buffer);
+ }
+ }
+ if (strncmp (devname, "sbp/", 4) == 0)
+ {
+ sprintf (buffer, "sbpcd%u", minor);
+ compat_name = buffer;
+ }
+ else if (strncmp (devname, "scsi/", 5) == 0)
+ { /* All SCSI devices */
+ if (strcmp (devname + namelen - 7, "generic") == 0)
+ {
+ sprintf (buffer, "sg%u", minor);
+ compat_name = buffer;
+ }
+ else if (strncmp (ptr = (strrchr (devname, '/') + 1), "mt", 2) == 0)
+ {
+ char mode = ptr[2];
+
+ if (mode == 'n')
+ mode = '\0';
+ sprintf (buffer, "nst%u%c", minor & 0x1f, mode);
+ compat_name = buffer;
+ if (devname[namelen - 1] != 'n')
+ ++compat_name;
+ }
+ else if (strcmp (devname + namelen - 2, "cd") == 0)
+ {
+ sprintf (buffer, "sr%u", minor);
+ compat_name = buffer;
+ }
+ else if (strcmp (devname + namelen - 4, "disc") == 0)
+ compat_name = write_old_sd_name (buffer, major, minor, "");
+ else if (strncmp (ptr = (strrchr (devname, '/') + 1), "part", 4) == 0)
+ compat_name = write_old_sd_name (buffer, major, minor, ptr + 4);
+ return (compat_name);
+ }
+ else if (strncmp (devname, "ide/host", 8) == 0)
+ { /* All IDE devices */
+ if (strncmp (ptr = (strrchr (devname, '/') + 1), "mt", 2) == 0)
+ {
+ sprintf (buffer, "%sht%d", ptr + 2, minor & 0x7f);
+ compat_name = buffer;
+ }
+ else if (strcmp (devname + namelen - 4, "disc") == 0)
+ {
+ sprintf ( buffer, "hd%c", get_old_ide_name (major, minor) );
+ compat_name = buffer;
+ }
+ else if (strncmp (ptr = (strrchr (devname, '/') + 1), "part", 4) == 0)
+ {
+ sprintf (buffer, "hd%c%s", get_old_ide_name (major, minor), ptr + 4);
+ compat_name = buffer;
+ }
+ else if (strcmp (devname + namelen - 2, "cd") == 0)
+ {
+ sprintf ( buffer, "hd%c", get_old_ide_name (major, minor) );
+ compat_name = buffer;
+ }
+ return (compat_name);
+ }
+ else if (strncmp (devname, "vcc/", 4) == 0)
+ {
+ sprintf (buffer, "vcs%s", devname + 4);
+ if (buffer[3] == '0')
+ buffer[3] = '\0';
+ compat_name = buffer;
+ }
+ else if (strncmp (devname, "pty/", 4) == 0)
+ {
+ int indexx = atoi (devname + 5);
+ const char *pty1 = "pqrstuvwxyzabcde";
+ const char *pty2 = "0123456789abcdef";
+
+ sprintf (buffer, "%cty%c%c", (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
+ compat_name = buffer;
+ }
+ return (compat_name);
+} /* End Function get_old_name */
+
+static char get_old_ide_name (unsigned int major, unsigned int minor)
+/* [SUMMARY] Get the old IDE name for a device.
+ <major> The major number for the device.
+ <minor> The minor number for the device.
+ [RETURNS] The drive letter.
+*/
+{
+ char letter='y'; /* 121 */
+ char c='a'; /* 97 */
+ int i=IDE0_MAJOR;
+
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "get_old_ide_name()\n");
+#endif
+
+ /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
+ do {
+ if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR ||
+ i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR ||
+ i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR ||
+ i==IDE9_MAJOR )
+ {
+ if(i==major)
+ {
+ letter=c;
+ break;
+ }
+ c+=2;
+ }
+ i++;
+ } while(i<=IDE9_MAJOR);
+
+ if (minor > 63)
+ ++letter;
+ return (letter);
+} /* End Function get_old_ide_name */
+
+static char *write_old_sd_name (char *buffer,
+ unsigned int major, unsigned int minor,
+ char *part)
+/* [SUMMARY] Write the old SCSI disc name to a buffer.
+ <buffer> The buffer to write to.
+ <major> The major number for the device.
+ <minor> The minor number for the device.
+ <part> The partition string. Must be "" for a whole-disc entry.
+ [RETURNS] A pointer to the buffer on success, else NULL.
+*/
+{
+ unsigned int disc_index;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "write_old_sd_name()\n");
+#endif
+
+ if (major == 8)
+ {
+ sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part);
+ return (buffer);
+ }
+ if ( (major > 64) && (major < 72) )
+ {
+ disc_index = ( (major - 64) << 4 ) + (minor >> 4);
+ if (disc_index < 26)
+ sprintf (buffer, "sd%c%s", 'a' + disc_index, part);
+ else
+ sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part);
+ return (buffer);
+ }
+ return (NULL);
+} /* End Function write_old_sd_name */
+
+
+/* expression.c */
+
+/*EXPERIMENTAL_FUNCTION*/
+
+int st_expr_expand (char *output, unsigned int length, const char *input,
+ const char *(*get_variable_func) (const char *variable,
+ void *info),
+ void *info)
+/* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
+ <output> The output expanded expression is written here.
+ <length> The size of the output buffer.
+ <input> The input expression. This may equal <<output>>.
+ <get_variable> A function which will be used to get variable values. If
+ this returns NULL, the environment is searched instead. If this is NULL,
+ only the environment is searched.
+ <info> An arbitrary pointer passed to <<get_variable>>.
+ [RETURNS] TRUE on success, else FALSE.
+*/
+{
+ char ch;
+ unsigned int len;
+ unsigned int out_pos = 0;
+ const char *env;
+ const char *ptr;
+ struct passwd *pwent;
+ char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "st_expr_expand()\n");
+#endif
+
+ if (length > BUFFER_SIZE)
+ length = BUFFER_SIZE;
+ for (; TRUE; ++input)
+ {
+ switch (ch = *input)
+ {
+ case '$':
+ /* Variable expansion */
+ input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info);
+ if (input == NULL)
+ return (FALSE);
+ break;
+ case '~':
+ /* Home directory expansion */
+ ch = input[1];
+ if ( isspace (ch) || (ch == '/') || (ch == '\0') )
+ {
+ /* User's own home directory: leave separator for next time */
+ if ( ( env = getenv ("HOME") ) == NULL )
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, "HOME");
+#endif
+ return (FALSE);
+ }
+ len = strlen (env);
+ if (len + out_pos >= length)
+ goto st_expr_expand_out;
+ memcpy (buffer + out_pos, env, len + 1);
+ out_pos += len;
+ continue;
+ }
+ /* Someone else's home directory */
+ for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
+ /* VOID */ ;
+ len = ptr - input;
+ if (len >= sizeof tmp)
+ goto st_expr_expand_out;
+ safe_memcpy (tmp, input, len);
+ input = ptr - 1;
+ if ( ( pwent = getpwnam (tmp) ) == NULL )
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO, "getpwnam(): %s\n", tmp);
+#endif
+ return (FALSE);
+ }
+ len = strlen (pwent->pw_dir);
+ if (len + out_pos >= length)
+ goto st_expr_expand_out;
+ memcpy (buffer + out_pos, pwent->pw_dir, len + 1);
+ out_pos += len;
+ break;
+ case '\0':
+ /* Falltrough */
+ default:
+ if (out_pos >= length)
+ goto st_expr_expand_out;
+ buffer[out_pos++] = ch;
+ if (ch == '\0')
+ {
+ memcpy (output, buffer, out_pos);
+ return (TRUE);
+ }
+ break;
+ /* esac */
+ }
+ }
+ return (FALSE);
+st_expr_expand_out:
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer);
+#endif
+ return (FALSE);
+} /* End Function st_expr_expand */
+
+
+/* Private functions follow */
+
+static const char *expand_variable (char *buffer, unsigned int length,
+ unsigned int *out_pos, const char *input,
+ const char *(*func) (const char *variable,
+ void *info),
+ void *info)
+/* [SUMMARY] Expand a variable.
+ <buffer> The buffer to write to.
+ <length> The length of the output buffer.
+ <out_pos> The current output position. This is updated.
+ <input> A pointer to the input character pointer.
+ <func> A function which will be used to get variable values. If this
+ returns NULL, the environment is searched instead. If this is NULL, only
+ the environment is searched.
+ <info> An arbitrary pointer passed to <<func>>.
+ <errfp> Diagnostic messages are written here.
+ [RETURNS] A pointer to the end of this subexpression on success, else NULL.
+*/
+{
+ char ch;
+ int len;
+ unsigned int open_braces;
+ const char *env, *ptr;
+ char tmp[STRING_LENGTH];
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "expand_variable()\n");
+#endif
+
+ ch = input[0];
+ if (ch == '$')
+ {
+ /* Special case for "$$": PID */
+ sprintf ( tmp, "%d", (int) getpid () );
+ len = strlen (tmp);
+ if (len + *out_pos >= length)
+ goto expand_variable_out;
+
+ memcpy (buffer + *out_pos, tmp, len + 1);
+ out_pos += len;
+ return (input);
+ }
+ /* Ordinary variable expansion, possibly in braces */
+ if (ch != '{')
+ {
+ /* Simple variable expansion */
+ for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr)
+ /* VOID */ ;
+ len = ptr - input;
+ if (len >= sizeof tmp)
+ goto expand_variable_out;
+
+ safe_memcpy (tmp, input, len);
+ input = ptr - 1;
+ if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL )
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, tmp);
+#endif
+ return (NULL);
+ }
+ len = strlen (env);
+ if (len + *out_pos >= length)
+ goto expand_variable_out;
+
+ memcpy (buffer + *out_pos, env, len + 1);
+ *out_pos += len;
+ return (input);
+ }
+ /* Variable in braces: check for ':' tricks */
+ ch = *++input;
+ for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr)
+ /* VOID */;
+ if (ch == '}')
+ {
+ /* Must be simple variable expansion with "${var}" */
+ len = ptr - input;
+ if (len >= sizeof tmp)
+ goto expand_variable_out;
+
+ safe_memcpy (tmp, input, len);
+ ptr = expand_variable (buffer, length, out_pos, tmp, func, info );
+ if (ptr == NULL)
+ return (NULL);
+ return (input + len);
+ }
+ if (ch != ':' || ptr[1] != '-' )
+ {
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO,"illegal char in var name\n");
+#endif
+ return (NULL);
+ }
+ /* It's that handy "${var:-word}" expression. Check if var is defined */
+ len = ptr - input;
+ if (len >= sizeof tmp)
+ goto expand_variable_out;
+
+ safe_memcpy (tmp, input, len);
+ /* Move input pointer to ':' */
+ input = ptr;
+ /* First skip to closing brace, taking note of nested expressions */
+ ptr += 2;
+ ch = ptr[0];
+ for (open_braces = 1; open_braces > 0; ch = *++ptr)
+ {
+ switch (ch)
+ {
+ case '{':
+ ++open_braces;
+ break;
+ case '}':
+ --open_braces;
+ break;
+ case '\0':
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO,"\"}\" not found in: %s\n", input);
+#endif
+ return (NULL);
+ default:
+ break;
+ }
+ }
+ --ptr;
+ /* At this point ptr should point to closing brace of "${var:-word}" */
+ if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL )
+ {
+ /* Found environment variable, so skip the input to the closing brace
+ and return the variable */
+ input = ptr;
+ len = strlen (env);
+ if (len + *out_pos >= length)
+ goto expand_variable_out;
+
+ memcpy (buffer + *out_pos, env, len + 1);
+ *out_pos += len;
+ return (input);
+ }
+ /* Environment variable was not found, so process word. Advance input
+ pointer to start of word in "${var:-word}" */
+ input += 2;
+ len = ptr - input;
+ if (len >= sizeof tmp)
+ goto expand_variable_out;
+
+ safe_memcpy (tmp, input, len);
+ input = ptr;
+ if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) )
+ return (NULL);
+ len = strlen (tmp);
+ if (len + *out_pos >= length)
+ goto expand_variable_out;
+
+ memcpy (buffer + *out_pos, tmp, len + 1);
+ *out_pos += len;
+ return (input);
+expand_variable_out:
+#ifdef CONFIG_DEVFSD_VERBOSE
+ msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer);
+#endif
+ return (NULL);
+} /* End Function expand_variable */
+
+
+static const char *get_variable_v2 (const char *variable,
+ const char *(*func) (const char *variable, void *info),
+ void *info)
+/* [SUMMARY] Get a variable from the environment or .
+ <variable> The variable name.
+ <func> A function which will be used to get the variable. If this returns
+ NULL, the environment is searched instead. If this is NULL, only the
+ environment is searched.
+ [RETURNS] The value of the variable on success, else NULL.
+*/
+{
+ const char *value;
+
+#ifdef CONFIG_DEVFSD_DEBUG
+ msg_logger( NO_DIE, LOG_INFO, "get_variable_v2()\n");
+#endif
+
+ if (func != NULL)
+ {
+ value = (*func) (variable, info);
+ if (value != NULL)
+ return (value);
+ }
+ return getenv (variable);
+} /* End Function get_variable */
+
+/* END OF CODE */
projects / platform / upstream / busybox.git / commitdiff