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busybox/miscutils/devfsd.c

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/*
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 "busybox.h"
#include "xregex.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.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 <syslog.h>
#include <signal.h>
#include <errno.h>
#include <sys/sysmacros.h>
/* Various defines taken from linux/major.h */
#define IDE0_MAJOR 3
#define IDE1_MAJOR 22
#define IDE2_MAJOR 33
#define IDE3_MAJOR 34
#define IDE4_MAJOR 56
#define IDE5_MAJOR 57
#define IDE6_MAJOR 88
#define IDE7_MAJOR 89
#define IDE8_MAJOR 90
#define IDE9_MAJOR 91
/* Various defines taken from linux/devfs_fs.h */
#define DEVFSD_PROTOCOL_REVISION_KERNEL 5
#define DEVFSD_IOCTL_BASE 'd'
/* These are the various ioctls */
#define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int)
#define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int)
#define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int)
#define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int)
#define DEVFSD_NOTIFY_REGISTERED 0
#define DEVFSD_NOTIFY_UNREGISTERED 1
#define DEVFSD_NOTIFY_ASYNC_OPEN 2
#define DEVFSD_NOTIFY_CLOSE 3
#define DEVFSD_NOTIFY_LOOKUP 4
#define DEVFSD_NOTIFY_CHANGE 5
#define DEVFSD_NOTIFY_CREATE 6
#define DEVFSD_NOTIFY_DELETE 7
#define DEVFS_PATHLEN 1024
/* Never change this otherwise the binary interface will change */
struct devfsd_notify_struct
{ /* Use native C types to ensure same types in kernel and user space */
unsigned int type; /* DEVFSD_NOTIFY_* value */
unsigned int mode; /* Mode of the inode or device entry */
unsigned int major; /* Major number of device entry */
unsigned int minor; /* Minor number of device entry */
unsigned int uid; /* Uid of process, inode or device entry */
unsigned int gid; /* Gid of process, inode or device entry */
unsigned int overrun_count; /* Number of lost events */
unsigned int namelen; /* Number of characters not including '\0' */
/* The device name MUST come last */
char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */
};
#define BUFFER_SIZE 16384
#define DEVFSD_VERSION "1.3.25"
#define CONFIG_FILE "/etc/devfsd.conf"
#define MODPROBE "/sbin/modprobe"
#define MODPROBE_SWITCH_1 "-k"
#define MODPROBE_SWITCH_2 "-C"
#define CONFIG_MODULES_DEVFS "/etc/modules.devfs"
#define MAX_ARGS (6 + 1)
#define MAX_SUBEXPR 10
#define STRING_LENGTH 255
/* for get_uid_gid() */
#define UID 0
#define GID 1
/* fork_and_execute() */
# define DIE 1
# define NO_DIE 0
/* for dir_operation() */
#define RESTORE 0
#define SERVICE 1
#define READ_CONFIG 2
/* 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
#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 void dir_operation(int , const char * , int, unsigned long* );
static void service(struct stat statbuf, char *path);
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 (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_modload (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
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 restore(char *spath, struct stat source_stat, int rootlen);
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 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 pri, const char * fmt, ... )__attribute__ ((format (printf, 2, 3)));
static void msg_logger_and_die(int pri, const char * fmt, ... )__attribute__ ((noreturn, format (printf, 2, 3)));
static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag);
static void fork_and_execute(int die, char *arg0, char **arg );
static int get_uid_gid ( int, const char *);
static void safe_memcpy( char * dest, const char * src, int len);
static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr);
static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr);
/* 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 messages */
static const char * const bb_msg_proto_rev = "protocol revision";
static const char * const bb_msg_bad_config = "bad %s config file: %s";
static const char * const bb_msg_small_buffer = "buffer too small";
static const char * const bb_msg_variable_not_found = "variable: %s not found";
/* Busybox functions */
static void msg_logger(int pri, const char * fmt, ... )
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = access ("/dev/log", F_OK);
if (ret == 0) {
openlog(bb_applet_name, 0, LOG_DAEMON);
vsyslog( pri , fmt, ap);
/* Man: A trailing newline is added when needed. */
closelog();
}
/* ENABLE_DEVFSD_VERBOSE is always enabled if msg_logger is used */
if ((ENABLE_DEVFSD_VERBOSE && ret) || ENABLE_DEBUG) {
bb_error_msg(fmt, ap);
}
va_end(ap);
}
static void msg_logger_and_die(int pri, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
msg_logger(pri, fmt, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
/* Busybox stuff */
#if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG)
#define devfsd_error_msg(fmt, args...) bb_error_msg(fmt, ## args)
#define devfsd_perror_msg_and_die(fmt, args...) bb_perror_msg_and_die(fmt, ## args)
#define devfsd_error_msg_and_die(fmt, args...) bb_error_msg_and_die(fmt, ## args)
#if defined(CONFIG_DEBUG)
#define debug_msg_logger(x, fmt, args...) msg_logger(x, fmt, ## args)
#else
#define debug_msg_logger(x, fmt, args...)
#endif
#else
#define debug_msg_logger(x, fmt, args...)
#define msg_logger(p, fmt, args...)
#define msg_logger_and_die(p, fmt, args...) exit(1)
#define devfsd_perror_msg_and_die(fmt, args...) exit(1)
#define devfsd_error_msg_and_die(fmt, args...) exit(1)
#define devfsd_error_msg(fmt, args...)
#endif
static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag)
{
if (ioctl (fd, request, event_mask_flag) == -1)
msg_logger_and_die(LOG_ERR, "ioctl");
}
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(LOG_ERR,(char *) bb_msg_memory_exhausted);
if(die)
exit(EXIT_FAILURE);
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_and_die(LOG_ERR, "execvp");
}
}
static void safe_memcpy( char *dest, const char *src, int len)
{
memcpy (dest , src , len );
dest[len] = '\0';
}
static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr)
{
if( d[n - 4]=='d' && d[n - 3]=='i' && d[n - 2]=='s' && d[n - 1]=='c')
return (2 + addendum);
else if( d[n - 2]=='c' && d[n - 1]=='d')
return (3 + addendum);
else if(ptr[0]=='p' && ptr[1]=='a' && ptr[2]=='r' && ptr[3]=='t')
return (4 + addendum);
else if( ptr[n - 2]=='m' && ptr[n - 1]=='t')
return (5 + addendum);
else
return 0;
}
static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr)
{
if(d[0]=='s' && d[1]=='c' && d[2]=='s' && d[3]=='i' && d[4]=='/')
{
if( d[n - 7]=='g' && d[n - 6]=='e' && d[n - 5]=='n' &&
d[n - 4]=='e' && d[n - 3]=='r' && d[n - 2]=='i' &&
d[n - 1]=='c' )
return 1;
return scan_dev_name_common(d, n, 0, ptr);
}
else if(d[0]=='i' && d[1]=='d' && d[2]=='e' && d[3]=='/' &&
d[4]=='h' && d[5]=='o' && d[6]=='s' && d[7]=='t')
{
return scan_dev_name_common(d, n, 4, ptr);
}
else if(d[0]=='s' && d[1]=='b' && d[2]=='p' && d[3]=='/')
{
return 10;
}
else if(d[0]=='v' && d[1]=='c' && d[2]=='c' && d[3]=='/')
{
return 11;
}
else if(d[0]=='p' && d[1]=='t' && d[2]=='y' && d[3]=='/')
{
return 12;
}
return 0;
}
/* Public functions follow */
int devfsd_main (int argc, char **argv)
{
int print_version = FALSE;
int do_daemon = TRUE;
int no_polling = FALSE;
int do_scan;
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(argv[count][0] == '-')
{
if(argv[count][1]=='v' && !argv[count][2]) /* -v */
print_version = TRUE;
else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='f'
&& argv[count][2]=='g' && !argv[count][3]) /* -fg */
do_daemon = FALSE;
else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='n'
&& argv[count][2]=='p' && !argv[count][3]) /* -np */
no_polling = TRUE;
else
bb_show_usage();
}
}
/* strip last / from mount point, so we don't need to check for it later */
while( argv[1][1]!='\0' && argv[1][strlen(argv[1])-1] == '/' )
argv[1][strlen(argv[1]) -1] = '\0';
mount_point = argv[1];
if (chdir (mount_point) != 0)
devfsd_perror_msg_and_die(mount_point);
fd = bb_xopen (".devfsd", O_RDONLY);
if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0)
devfsd_perror_msg_and_die("FD_CLOEXEC");
if (ioctl (fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev) == -1)
msg_logger_and_die(LOG_ERR, "ioctl");
/*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_and_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 )
devfsd_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 */
dir_operation(SERVICE,mount_point,0,NULL);
if (ENABLE_DEVFSD_FG_NP && no_polling)
exit (0);
if (do_daemon)
{
/* Release so that the child can grab it */
do_ioctl_and_die(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
fork_and_execute(DIE, NULL, NULL);
setsid (); /* Prevent hangups and become pgrp leader */
} else if(ENABLE_DEVFSD_FG_NP) {
setpgid (0, 0); /* Become process group leader */
}
while (TRUE)
{
do_scan = do_servicing (fd, event_mask);
free_config ();
read_config_file (CONFIG_FILE, FALSE, &event_mask);
if (do_scan)
dir_operation(SERVICE,mount_point,0,NULL);
}
} /* End Function main */
/* Private functions follow */
static void read_config_file (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];
char *line=NULL;
debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, path);
if (stat (path, &statbuf) == 0 )
{
/* Don't read 0 length files: ignored */
/*if( statbuf.st_size == 0 )
return;*/
if ( S_ISDIR (statbuf.st_mode) )
{
/* strip last / from dirname so we don't need to check for it later */
while( path && path[1]!='\0' && path[strlen(path)-1] == '/')
path[strlen(path) -1] = '\0';
dir_operation(READ_CONFIG, path, 0, event_mask);
return;
}
if ( ( fp = fopen (path, "r") ) != NULL )
{
while (fgets (buf, STRING_LENGTH, fp) != NULL)
{
/* Skip whitespace */
for (line = buf; isspace (*line); ++line)
/*VOID*/;
if (line[0] == '\0' || line[0] == '#' )
continue;
process_config_line (line, event_mask);
}
fclose (fp);
} else {
goto read_config_file_err;
}
} else {
read_config_file_err:
if(optional == 0 && errno == ENOENT)
msg_logger_and_die(LOG_ERR, "read config file: %s: %m", path);
}
return;
} /* 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="";
char *ptr;
int i;
/* !!!! Only Uppercase Keywords in devsfd.conf */
static const char *const options[] = {
"CLEAR_CONFIG", "INCLUDE", "OPTIONAL_INCLUDE",
"RESTORE", "PERMISSIONS", "MODLOAD", "EXECUTE",
"COPY", "IGNORE", "MKOLDCOMPAT", "MKNEWCOMPAT",
"RMOLDCOMPAT", "RMNEWCOMPAT", 0
};
debug_msg_logger(LOG_INFO, __FUNCTION__);
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]);
i = compare_string_array(options, when );
/*"CLEAR_CONFIG"*/
if( i == 0)
{
free_config ();
*event_mask = 0;
return;
}
if ( num_args < 2)
goto process_config_line_err;
/* "INCLUDE" & "OPTIONAL_INCLUDE" */
if( i == 1 || i == 2 )
{
st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL );
msg_logger(LOG_INFO, "%sinclude: %s",(toupper (when[0]) == 'I') ? "": "optional_", name);
read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask);
return;
}
/* "RESTORE" */
if( i == 3)
{
dir_operation(RESTORE,name, strlen (name),NULL);
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;
}
i = compare_string_array(options, what );
switch(i)
{
case 4: /* "PERMISSIONS" */
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]);
break;
case 5: /* MODLOAD */
/*This action will pass "/dev/$devname" (i.e. "/dev/" prefixed to
the device name) to the module loading facility. In addition,
the /etc/modules.devfs configuration file is used.*/
if (ENABLE_DEVFSD_MODLOAD)
new->action.what = AC_MODLOAD;
break;
case 6: /* EXECUTE */
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;
break;
case 7: /* COPY */
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]);
break;
case 8: /* IGNORE */
/* FALLTROUGH */
case 9: /* MKOLDCOMPAT */
/* FALLTROUGH */
case 10: /* MKNEWCOMPAT */
/* FALLTROUGH */
case 11:/* RMOLDCOMPAT */
/* FALLTROUGH */
case 12: /* RMNEWCOMPAT */
/* AC_IGNORE 6
AC_MKOLDCOMPAT 7
AC_MKNEWCOMPAT 8
AC_RMOLDCOMPAT 9
AC_RMNEWCOMPAT 10*/
new->action.what = i - 2;
break;
default:
msg ="WHAT in";
goto process_config_line_err;
/*esac*/
} /* switch (i) */
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_and_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;
debug_msg_logger(LOG_INFO, __FUNCTION__);
/* Tell devfs what events we care about */
tmp_event_mask = event_mask;
do_ioctl_and_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;
service_name (&info);
}
if (caught_signal)
{
int c_sighup = caught_sighup;
caught_signal = FALSE;
caught_sighup = FALSE;
return (c_sighup);
}
msg_logger_and_die(LOG_ERR, "read error on control file");
} /* 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;
debug_msg_logger(LOG_INFO, __FUNCTION__);
if (ENABLE_DEBUG && info->overrun_count > 0)
debug_msg_logger(LOG_ERR, "lost %u events", info->overrun_count);
/* Discard lookups on "/dev/log" and "/dev/initctl" */
if( info->type == DEVFSD_NOTIFY_LOOKUP &&
((info->devname[0]=='l' && info->devname[1]=='o' &&
info->devname[2]=='g' && !info->devname[3]) ||
( info->devname[0]=='i' && info->devname[1]=='n' &&
info->devname[2]=='i' && info->devname[3]=='t' &&
info->devname[4]=='c' && info->devname[5]=='t' &&
info->devname[6]=='l' && !info->devname[7])))
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 */;
debug_msg_logger(LOG_INFO, "%s: action.what %d", __FUNCTION__, entry->action.what);
switch (entry->action.what)
{
case AC_PERMISSIONS:
action_permissions (info, entry);
break;
case AC_MODLOAD:
if(ENABLE_DEVFSD_MODLOAD)
action_modload (info, entry);
break;
case AC_EXECUTE:
action_execute (info, entry, mbuf, n);
break;
case AC_COPY:
action_copy (info, entry, mbuf, n);
break;
case AC_IGNORE:
return;
/*break;*/
case AC_MKOLDCOMPAT:
case AC_MKNEWCOMPAT:
case AC_RMOLDCOMPAT:
case AC_RMNEWCOMPAT:
action_compat (info, entry->action.what);
break;
default:
msg_logger_and_die(LOG_ERR, "Unknown action");
}
}
} /* 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;
debug_msg_logger(LOG_INFO, __FUNCTION__);
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)
{
msg_logger(LOG_ERR, "Can't chmod or chown: %s: %m",info->devname);
}
} /* End Function action_permissions */
static void action_modload (const struct devfsd_notify_struct *info,
const struct config_entry_struct *entry ATTRIBUTE_UNUSED)
/* [SUMMARY] Load a module.
<info> The devfs change.
<entry> The config file entry.
[RETURNS] Nothing.
*/
{
char *argv[6];
char device[STRING_LENGTH];
argv[0] = MODPROBE;
argv[1] = MODPROBE_SWITCH_1; /* "-k" */
argv[2] = MODPROBE_SWITCH_2; /* "-C" */
argv[3] = CONFIG_MODULES_DEVFS;
argv[4] = device;
argv[5] = NULL;
snprintf (device, sizeof (device), "/dev/%s", info->devname);
debug_msg_logger(LOG_INFO, "%s: %s %s %s %s %s",__FUNCTION__, argv[0],argv[1],argv[2],argv[3],argv[4]);
fork_and_execute(DIE, argv[0], argv);
} /* End Function action_modload */
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];
debug_msg_logger(LOG_INFO ,__FUNCTION__);
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;
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];
int ret = 0;
debug_msg_logger(LOG_INFO, __FUNCTION__);
dest_stat.st_mode = 0;
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)
return;
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;
ret = copy_inode (destination, &dest_stat, new_mode, source, &source_stat);
if (ENABLE_DEBUG && ret && (errno != EEXIST))
debug_msg_logger(LOG_ERR, "copy_inode: %s to %s: %m", source, destination);
return;
} /* 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.
*/
{
int ret;
const char *compat_name = NULL;
const char *dest_name = info->devname;
char *ptr=NULL;
char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
int mode, host, bus, target, lun;
unsigned int i;
char rewind_;
/* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
static const char *const fmt[] = {
NULL ,
"sg/c%db%dt%du%d", /* scsi/generic */
"sd/c%db%dt%du%d", /* scsi/disc */
"sr/c%db%dt%du%d", /* scsi/cd */
"sd/c%db%dt%du%dp%d", /* scsi/part */
"st/c%db%dt%du%dm%d%c", /* scsi/mt */
"ide/hd/c%db%dt%du%d", /* ide/host/disc */
"ide/cd/c%db%dt%du%d", /* ide/host/cd */
"ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
"ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
NULL
};
/* 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:
ptr = strrchr (info->devname, '/') + 1;
i=scan_dev_name(info->devname, info->namelen, ptr);
debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i);
/* nothing found */
if(i==0 || i > 9)
return;
sscanf (info->devname +((i<6)?5:4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + ((i>5)?4:0));
dest_name = dest_buf;
compat_name = compat_buf;
/* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
if( i == 1 || i == 2 || i == 3 || i == 6 || i ==7 )
sprintf ( compat_buf, fmt[i], host, bus, target, lun);
/* 4 == scsi/part 8 == ide/host/part */
if( i == 4 || i == 8)
sprintf ( compat_buf, fmt[i], host, bus, target, lun, atoi (ptr + 4) );
/* 5 == scsi/mt */
if( i == 5)
{
rewind_ = info->devname[info->namelen - 1];
if (rewind_ != 'n')
rewind_ = '\0';
mode=0;
if(ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
mode = ptr[2] - 107; /* 1 or 2 */
if(ptr[2] == 'a')
mode = 3;
sprintf (compat_buf, fmt [i], host, bus, target, lun, mode, rewind_);
}
/* 9 == ide/host/mt */
if( i == 9 )
snprintf (compat_buf, sizeof (compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
/* esac */
} /* switch(action) */
if(compat_name == NULL )
return;
debug_msg_logger( LOG_INFO, "%s: %s", __FUNCTION__, compat_name);
/* 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:
ret = unlink (compat_name);
if (ENABLE_DEBUG && ret)
debug_msg_logger(LOG_ERR, "unlink: %s: %m", compat_name);
break;
/*esac*/
} /* switch(action) */
} /* End Function action_compat */
static void restore(char *spath, struct stat source_stat, int rootlen)
{
char dpath[STRING_LENGTH];
struct stat dest_stat;
debug_msg_logger(LOG_INFO, __FUNCTION__);
dest_stat.st_mode = 0;
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) )
dir_operation(RESTORE, spath, rootlen,NULL);
}
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.
*/
{
int source_len, dest_len;
char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
int fd, val;
struct sockaddr_un un_addr;
char symlink_val[STRING_LENGTH];
debug_msg_logger(LOG_INFO, __FUNCTION__);
if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) )
{
/* Same type */
if ( S_ISLNK (source_stat->st_mode) )
{
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)
{
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;
goto do_chown;
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;
goto do_chown;
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
if (mknod (destpath, new_mode, source_stat->st_rdev) != 0)
break;
goto do_chown;
case S_IFDIR:
if (mkdir (destpath, new_mode & ~S_IFMT) != 0)
break;
do_chown:
if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
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;
debug_msg_logger(LOG_INFO, __FUNCTION__);
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;
static char *msg;
if (ENABLE_DEVFSD_VERBOSE)
msg="user";
debug_msg_logger(LOG_INFO, __FUNCTION__);
if(ENABLE_DEBUG && flag != UID && flag != GID)
msg_logger_and_die(LOG_ERR,"%s: flag != UID && flag != GID", __FUNCTION__);
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 if(ENABLE_DEVFSD_VERBOSE)
msg="group";
if(ENABLE_DEVFSD_VERBOSE)
msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]);
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;
int i;
debug_msg_logger(LOG_INFO, __FUNCTION__);
if ( isdigit (string[0]) )
return strtoul (string, NULL, 8);
if (strlen (string) != 9)
msg_logger_and_die(LOG_ERR, "bad mode: %s", string);
mode = 0;
i= S_IRUSR;
while(i>0)
{
if(string[0]=='r'||string[0]=='w'||string[0]=='x')
mode+=i;
i=i/2;
string++;
}
return (mode);
} /* End Function get_mode */
static void signal_handler (int sig)
{
debug_msg_logger(LOG_INFO, __FUNCTION__);
caught_signal = TRUE;
if (sig == SIGHUP)
caught_sighup = TRUE;
msg_logger(LOG_INFO, "Caught signal %d", sig);
} /* 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];
const char *field_names[] = { "hostname", "mntpt", "devpath", "devname",
"uid", "gid", "mode", hostname, mount_point,
gv_info->devpath, gv_info->devname, 0 };
int i;
debug_msg_logger(LOG_INFO, __FUNCTION__);
if (gethostname (hostname, STRING_LENGTH - 1) != 0)
msg_logger_and_die(LOG_ERR, "gethostname: %m");
/* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
hostname[STRING_LENGTH - 1] = '\0';
/* compare_string_array returns i>=0 */
i=compare_string_array(field_names, variable);
if ( i > 6 && (i > 1 && gv_info == NULL))
return (NULL);
if( i >= 0 || i <= 3)
{
debug_msg_logger(LOG_INFO, "%s: i=%d %s", __FUNCTION__, i ,field_names[i+7]);
return(field_names[i+7]);
}
if(i == 4 )
sprintf (sbuf, "%u", gv_info->info->uid);
else if(i == 5)
sprintf (sbuf, "%u", gv_info->info->gid);
else if(i == 6)
sprintf (sbuf, "%o", gv_info->info->mode);
debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, sbuf);
return (sbuf);
} /* End Function get_variable */
static void service(struct stat statbuf, char *path)
{
struct devfsd_notify_struct info;
debug_msg_logger(LOG_INFO, __FUNCTION__);
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) )
dir_operation(SERVICE,path,0,NULL);
}
static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
/* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
<flag> To choose which function to perform
<dp> The directory pointer. This is closed upon completion.
<dir_name> The name of the directory.
<rootlen> string length parameter.
[RETURNS] Nothing.
*/
{
struct stat statbuf;
DIR *dp;
struct dirent *de;
char path[STRING_LENGTH];
debug_msg_logger(LOG_INFO, __FUNCTION__);
if((dp = opendir( dir_name))==NULL)
{
debug_msg_logger(LOG_ERR, "opendir: %s: %m", dir_name);
return;
}
while ( (de = readdir (dp) ) != NULL )
{
if(de->d_name && *de->d_name == '.' && (!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2])))
continue;
snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name);
debug_msg_logger(LOG_ERR, "%s: %s", __FUNCTION__, path);
if (lstat (path, &statbuf) != 0)
{
debug_msg_logger(LOG_ERR, "%s: %s: %m", __FUNCTION__, path);
continue;
}
switch(type)
{
case SERVICE:
service(statbuf,path);
break;
case RESTORE:
restore(path, statbuf, var);
break;
case READ_CONFIG:
read_config_file (path, var, event_mask);
break;
}
}
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.
*/
{
debug_msg_logger(LOG_INFO, __FUNCTION__);
if ( !make_dir_tree (newpath) )
return (-1);
if (symlink (oldpath, newpath) != 0)
{
if (errno != EEXIST)
{
debug_msg_logger(LOG_ERR, "%s: %s to %s: %m", __FUNCTION__, oldpath, newpath);
return (-1);
}
}
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 the leaf node).
[RETURNS] TRUE on success, else FALSE.
*/
{
debug_msg_logger(LOG_INFO, __FUNCTION__);
if (bb_make_directory( dirname((char *)path), -1, FILEUTILS_RECUR )==-1)
{
debug_msg_logger(LOG_ERR, "%s: %s: %m",__FUNCTION__, path);
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 environment 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];
debug_msg_logger(LOG_INFO, __FUNCTION__);
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;
debug_msg_logger(LOG_INFO, __FUNCTION__);
/* 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;
unsigned int i;
char mode;
int indexx;
const char *pty1;
const char *pty2;
size_t len;
/* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
static const char *const fmt[] = {
NULL ,
"sg%u", /* scsi/generic */
NULL, /* scsi/disc */
"sr%u", /* scsi/cd */
NULL, /* scsi/part */
"nst%u%c", /* scsi/mt */
"hd%c" , /* ide/host/disc */
"hd%c" , /* ide/host/cd */
"hd%c%s", /* ide/host/part */
"%sht%d", /* ide/host/mt */
"sbpcd%u", /* sbp/ */
"vcs%s", /* vcc/ */
"%cty%c%c", /* pty/ */
NULL
};
debug_msg_logger(LOG_INFO, __FUNCTION__);
for (trans = translate_table; trans->match != NULL; ++trans)
{
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);
}
}
ptr = (strrchr (devname, '/') + 1);
i = scan_dev_name(devname, namelen, ptr);
if( i > 0 && i < 13)
compat_name = buffer;
else
return NULL;
debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i);
/* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
if( i == 1 || i == 3 || i == 10 )
sprintf (buffer, fmt[i], minor);
/* 2 ==scsi/disc, 4 == scsi/part */
if( i == 2 || i == 4)
compat_name = write_old_sd_name (buffer, major, minor,((i == 2)?"":(ptr + 4)));
/* 5 == scsi/mt */
if( i == 5)
{
mode = ptr[2];
if (mode == 'n')
mode = '\0';
sprintf (buffer, fmt[i], minor & 0x1f, mode);
if (devname[namelen - 1] != 'n')
++compat_name;
}
/* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
if( i == 6 || i == 7 || i == 8 )
/* last arg should be ignored for i == 6 or i== 7 */
sprintf (buffer, fmt[i] , get_old_ide_name (major, minor), ptr + 4);
/* 9 == ide/host/mt */
if( i == 9 )
sprintf (buffer, fmt[i], ptr + 2, minor & 0x7f);
/* 11 == vcc/ */
if( i == 11 )
{
sprintf (buffer, fmt[i], devname + 4);
if (buffer[3] == '0')
buffer[3] = '\0';
}
/* 12 == pty/ */
if( i == 12 )
{
pty1 = "pqrstuvwxyzabcde";
pty2 = "0123456789abcdef";
indexx = atoi (devname + 5);
sprintf (buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
}
if(ENABLE_DEBUG && compat_name!=NULL)
msg_logger(LOG_INFO, "%s: compat_name %s", __FUNCTION__, compat_name);
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;
debug_msg_logger(LOG_INFO, __FUNCTION__);
/* 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((unsigned int)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;
debug_msg_logger(LOG_INFO, __FUNCTION__);
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];
debug_msg_logger(LOG_INFO, __FUNCTION__);
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 )
{
msg_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
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 )
{
msg_logger(LOG_INFO, "no pwent for: %s", tmp);
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:
msg_logger(LOG_INFO, bb_msg_small_buffer);
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];
debug_msg_logger(LOG_INFO, __FUNCTION__);
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 ((size_t)len >= sizeof tmp)
goto expand_variable_out;
safe_memcpy (tmp, input, len);
input = ptr - 1;
if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL )
{
msg_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
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 "${var}" */
len = ptr - input;
if ((size_t)len >= sizeof tmp)
goto expand_variable_out;
safe_memcpy (tmp, input, len);
ptr = expand_variable (buffer, length, out_pos, tmp, func, info );
if (ptr == NULL)
return (NULL);
return (input + len);
}
if (ch != ':' || ptr[1] != '-' )
{
msg_logger(LOG_INFO, "illegal char in var name");
return (NULL);
}
/* It's that handy "${var:-word}" expression. Check if var is defined */
len = ptr - input;
if ((size_t)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':
msg_logger(LOG_INFO,"\"}\" not found in: %s", input);
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 ((size_t)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:
msg_logger(LOG_INFO, bb_msg_small_buffer);
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;
debug_msg_logger(LOG_INFO, __FUNCTION__);
if (func != NULL)
{
value = (*func) (variable, info);
if (value != NULL)
return (value);
}
return getenv (variable);
} /* End Function get_variable */
/* END OF CODE */
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