[1770] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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[1770] | 3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 4 | */
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| 5 |
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| 6 | /*
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[821] | 7 | devfsd implementation for busybox
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| 8 |
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| 9 | Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
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| 10 |
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| 11 | Busybox version is based on some previous work and ideas
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| 12 | Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it>
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| 13 |
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| 14 | devfsd.c
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| 15 |
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| 16 | Main file for devfsd (devfs daemon for Linux).
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| 17 |
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| 18 | Copyright (C) 1998-2002 Richard Gooch
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| 19 |
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| 20 | devfsd.h
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| 21 |
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| 22 | Header file for devfsd (devfs daemon for Linux).
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| 23 |
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| 24 | Copyright (C) 1998-2000 Richard Gooch
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| 25 |
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| 26 | compat_name.c
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| 27 |
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| 28 | Compatibility name file for devfsd (build compatibility names).
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| 29 |
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| 30 | Copyright (C) 1998-2002 Richard Gooch
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| 31 |
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| 32 | expression.c
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| 33 |
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| 34 | This code provides Borne Shell-like expression expansion.
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| 35 |
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| 36 | Copyright (C) 1997-1999 Richard Gooch
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| 37 |
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| 38 | This program is free software; you can redistribute it and/or modify
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| 39 | it under the terms of the GNU General Public License as published by
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| 40 | the Free Software Foundation; either version 2 of the License, or
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| 41 | (at your option) any later version.
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| 42 |
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| 43 | This program is distributed in the hope that it will be useful,
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| 44 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 45 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 46 | GNU General Public License for more details.
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| 47 |
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| 48 | You should have received a copy of the GNU General Public License
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| 49 | along with this program; if not, write to the Free Software
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| 50 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 51 |
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| 52 | Richard Gooch may be reached by email at rgooch@atnf.csiro.au
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| 53 | The postal address is:
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| 54 | Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
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| 55 | */
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| 56 |
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[1770] | 57 | //#include <sys/wait.h>
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| 58 | //#include <sys/ioctl.h>
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| 59 | //#include <sys/socket.h>
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[821] | 60 | #include <sys/un.h>
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| 61 | #include <dirent.h>
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| 62 | #include <syslog.h>
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| 63 | #include <sys/sysmacros.h>
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[1770] | 64 | #include "libbb.h"
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| 65 | #include "xregex.h"
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[821] | 66 |
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| 67 |
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| 68 | /* Various defines taken from linux/major.h */
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| 69 | #define IDE0_MAJOR 3
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| 70 | #define IDE1_MAJOR 22
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| 71 | #define IDE2_MAJOR 33
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| 72 | #define IDE3_MAJOR 34
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| 73 | #define IDE4_MAJOR 56
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| 74 | #define IDE5_MAJOR 57
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| 75 | #define IDE6_MAJOR 88
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| 76 | #define IDE7_MAJOR 89
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| 77 | #define IDE8_MAJOR 90
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| 78 | #define IDE9_MAJOR 91
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| 79 |
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| 80 |
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| 81 | /* Various defines taken from linux/devfs_fs.h */
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| 82 | #define DEVFSD_PROTOCOL_REVISION_KERNEL 5
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| 83 | #define DEVFSD_IOCTL_BASE 'd'
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| 84 | /* These are the various ioctls */
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| 85 | #define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int)
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| 86 | #define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int)
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| 87 | #define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int)
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| 88 | #define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int)
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| 89 | #define DEVFSD_NOTIFY_REGISTERED 0
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| 90 | #define DEVFSD_NOTIFY_UNREGISTERED 1
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| 91 | #define DEVFSD_NOTIFY_ASYNC_OPEN 2
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| 92 | #define DEVFSD_NOTIFY_CLOSE 3
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| 93 | #define DEVFSD_NOTIFY_LOOKUP 4
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| 94 | #define DEVFSD_NOTIFY_CHANGE 5
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| 95 | #define DEVFSD_NOTIFY_CREATE 6
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| 96 | #define DEVFSD_NOTIFY_DELETE 7
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| 97 | #define DEVFS_PATHLEN 1024
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| 98 | /* Never change this otherwise the binary interface will change */
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| 99 |
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| 100 | struct devfsd_notify_struct
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| 101 | { /* Use native C types to ensure same types in kernel and user space */
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| 102 | unsigned int type; /* DEVFSD_NOTIFY_* value */
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| 103 | unsigned int mode; /* Mode of the inode or device entry */
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| 104 | unsigned int major; /* Major number of device entry */
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| 105 | unsigned int minor; /* Minor number of device entry */
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| 106 | unsigned int uid; /* Uid of process, inode or device entry */
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| 107 | unsigned int gid; /* Gid of process, inode or device entry */
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| 108 | unsigned int overrun_count; /* Number of lost events */
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| 109 | unsigned int namelen; /* Number of characters not including '\0' */
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| 110 | /* The device name MUST come last */
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| 111 | char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */
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| 112 | };
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| 113 |
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| 114 | #define BUFFER_SIZE 16384
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| 115 | #define DEVFSD_VERSION "1.3.25"
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| 116 | #define CONFIG_FILE "/etc/devfsd.conf"
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| 117 | #define MODPROBE "/sbin/modprobe"
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| 118 | #define MODPROBE_SWITCH_1 "-k"
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| 119 | #define MODPROBE_SWITCH_2 "-C"
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| 120 | #define CONFIG_MODULES_DEVFS "/etc/modules.devfs"
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| 121 | #define MAX_ARGS (6 + 1)
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| 122 | #define MAX_SUBEXPR 10
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| 123 | #define STRING_LENGTH 255
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| 124 |
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| 125 | /* for get_uid_gid() */
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| 126 | #define UID 0
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| 127 | #define GID 1
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| 128 |
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| 129 | /* fork_and_execute() */
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| 130 | # define DIE 1
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| 131 | # define NO_DIE 0
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| 132 |
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| 133 | /* for dir_operation() */
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| 134 | #define RESTORE 0
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| 135 | #define SERVICE 1
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| 136 | #define READ_CONFIG 2
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| 137 |
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| 138 | /* Update only after changing code to reflect new protocol */
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| 139 | #define DEVFSD_PROTOCOL_REVISION_DAEMON 5
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| 140 |
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| 141 | /* Compile-time check */
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| 142 | #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
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| 143 | #error protocol version mismatch. Update your kernel headers
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| 144 | #endif
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| 145 |
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| 146 | #define AC_PERMISSIONS 0
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| 147 | #define AC_MODLOAD 1
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| 148 | #define AC_EXECUTE 2
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| 149 | #define AC_MFUNCTION 3 /* not supported by busybox */
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| 150 | #define AC_CFUNCTION 4 /* not supported by busybox */
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| 151 | #define AC_COPY 5
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| 152 | #define AC_IGNORE 6
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| 153 | #define AC_MKOLDCOMPAT 7
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| 154 | #define AC_MKNEWCOMPAT 8
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| 155 | #define AC_RMOLDCOMPAT 9
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| 156 | #define AC_RMNEWCOMPAT 10
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| 157 | #define AC_RESTORE 11
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| 158 |
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| 159 | struct permissions_type
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| 160 | {
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[1770] | 161 | mode_t mode;
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| 162 | uid_t uid;
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| 163 | gid_t gid;
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[821] | 164 | };
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| 165 |
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| 166 | struct execute_type
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| 167 | {
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[1770] | 168 | char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
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[821] | 169 | };
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| 170 |
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| 171 | struct copy_type
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| 172 | {
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[1770] | 173 | const char *source;
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| 174 | const char *destination;
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[821] | 175 | };
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| 176 |
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| 177 | struct action_type
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| 178 | {
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[1770] | 179 | unsigned int what;
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| 180 | unsigned int when;
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[821] | 181 | };
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| 182 |
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| 183 | struct config_entry_struct
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| 184 | {
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[1770] | 185 | struct action_type action;
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| 186 | regex_t preg;
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| 187 | union
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| 188 | {
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[821] | 189 | struct permissions_type permissions;
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| 190 | struct execute_type execute;
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| 191 | struct copy_type copy;
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[1770] | 192 | }
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| 193 | u;
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| 194 | struct config_entry_struct *next;
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[821] | 195 | };
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| 196 |
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| 197 | struct get_variable_info
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| 198 | {
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[1770] | 199 | const struct devfsd_notify_struct *info;
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| 200 | const char *devname;
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| 201 | char devpath[STRING_LENGTH];
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[821] | 202 | };
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| 203 |
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[1770] | 204 | static void dir_operation(int , const char * , int, unsigned long*);
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[821] | 205 | static void service(struct stat statbuf, char *path);
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[1770] | 206 | static int st_expr_expand(char *, unsigned, const char *, const char *(*)(const char *, void *), void *);
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[821] | 207 | static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
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[1770] | 208 | static int mksymlink(const char *oldpath, const char *newpath);
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| 209 | static void read_config_file(char *path, int optional, unsigned long *event_mask);
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| 210 | static void process_config_line(const char *, unsigned long *);
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| 211 | static int do_servicing(int, unsigned long);
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| 212 | static void service_name(const struct devfsd_notify_struct *);
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| 213 | static void action_permissions(const struct devfsd_notify_struct *, const struct config_entry_struct *);
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| 214 | static void action_execute(const struct devfsd_notify_struct *, const struct config_entry_struct *,
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[821] | 215 | const regmatch_t *, unsigned);
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[1770] | 216 | static void action_modload(const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
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| 217 | static void action_copy(const struct devfsd_notify_struct *, const struct config_entry_struct *,
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[821] | 218 | const regmatch_t *, unsigned);
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[1770] | 219 | static void action_compat(const struct devfsd_notify_struct *, unsigned);
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| 220 | static void free_config(void);
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[821] | 221 | static void restore(char *spath, struct stat source_stat, int rootlen);
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[1770] | 222 | static int copy_inode(const char *, const struct stat *, mode_t, const char *, const struct stat *);
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| 223 | static mode_t get_mode(const char *);
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| 224 | static void signal_handler(int);
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| 225 | static const char *get_variable(const char *, void *);
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| 226 | static int make_dir_tree(const char *);
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[821] | 227 | static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
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[1770] | 228 | const char *, const regmatch_t *, unsigned);
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| 229 | static void expand_regexp(char *, size_t, const char *, const char *, const regmatch_t *, unsigned);
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[821] | 230 | static const char *expand_variable( char *, unsigned, unsigned *, const char *,
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[1770] | 231 | const char *(*)(const char *, void *), void *);
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| 232 | static const char *get_variable_v2(const char *, const char *(*)(const char *, void *), void *);
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| 233 | static char get_old_ide_name(unsigned , unsigned);
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| 234 | static char *write_old_sd_name(char *, unsigned, unsigned, const char *);
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[821] | 235 |
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| 236 | /* busybox functions */
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[1770] | 237 | static int get_uid_gid(int flag, const char *string);
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| 238 | static void safe_memcpy(char * dest, const char * src, int len);
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| 239 | static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr);
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| 240 | static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr);
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[821] | 241 |
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| 242 | /* Structs and vars */
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| 243 | static struct config_entry_struct *first_config = NULL;
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| 244 | static struct config_entry_struct *last_config = NULL;
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[1770] | 245 | static char *mount_point = NULL;
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[821] | 246 | static volatile int caught_signal = FALSE;
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| 247 | static volatile int caught_sighup = FALSE;
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[1770] | 248 | static struct initial_symlink_struct {
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| 249 | const char *dest;
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| 250 | const char *name;
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| 251 | } initial_symlinks[] = {
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| 252 | {"/proc/self/fd", "fd"},
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| 253 | {"fd/0", "stdin"},
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| 254 | {"fd/1", "stdout"},
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| 255 | {"fd/2", "stderr"},
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| 256 | {NULL, NULL},
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[821] | 257 | };
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| 258 |
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[1770] | 259 | static struct event_type {
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| 260 | unsigned int type; /* The DEVFSD_NOTIFY_* value */
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| 261 | const char *config_name; /* The name used in the config file */
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| 262 | } event_types[] = {
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| 263 | {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
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| 264 | {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
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| 265 | {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
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| 266 | {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
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| 267 | {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
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| 268 | {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
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| 269 | {DEVFSD_NOTIFY_CREATE, "CREATE"},
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| 270 | {DEVFSD_NOTIFY_DELETE, "DELETE"},
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| 271 | {0xffffffff, NULL}
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[821] | 272 | };
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| 273 |
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| 274 | /* Busybox messages */
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| 275 |
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[1770] | 276 | static const char bb_msg_proto_rev[] ALIGN1 = "protocol revision";
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| 277 | static const char bb_msg_bad_config[] ALIGN1 = "bad %s config file: %s";
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| 278 | static const char bb_msg_small_buffer[] ALIGN1 = "buffer too small";
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| 279 | static const char bb_msg_variable_not_found[] ALIGN1 = "variable: %s not found";
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[821] | 280 |
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| 281 | /* Busybox stuff */
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[1770] | 282 | #if ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG
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| 283 | #define info_logger(p, fmt, args...) bb_info_msg(fmt, ## args)
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| 284 | #define msg_logger(p, fmt, args...) bb_error_msg(fmt, ## args)
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| 285 | #define msg_logger_and_die(p, fmt, args...) bb_error_msg_and_die(fmt, ## args)
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| 286 | #define error_logger(p, fmt, args...) bb_perror_msg(fmt, ## args)
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| 287 | #define error_logger_and_die(p, fmt, args...) bb_perror_msg_and_die(fmt, ## args)
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[821] | 288 | #else
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[1770] | 289 | #define info_logger(p, fmt, args...)
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[821] | 290 | #define msg_logger(p, fmt, args...)
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| 291 | #define msg_logger_and_die(p, fmt, args...) exit(1)
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[1770] | 292 | #define error_logger(p, fmt, args...)
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| 293 | #define error_logger_and_die(p, fmt, args...) exit(1)
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[821] | 294 | #endif
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| 295 |
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[1770] | 296 | static void safe_memcpy(char *dest, const char *src, int len)
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[821] | 297 | {
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[1770] | 298 | memcpy(dest , src, len);
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[821] | 299 | dest[len] = '\0';
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| 300 | }
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| 301 |
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[1770] | 302 | static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr)
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[821] | 303 | {
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[1770] | 304 | if (d[n - 4] == 'd' && d[n - 3] == 'i' && d[n - 2] == 's' && d[n - 1] == 'c')
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| 305 | return 2 + addendum;
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| 306 | if (d[n - 2] == 'c' && d[n - 1] == 'd')
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| 307 | return 3 + addendum;
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| 308 | if (ptr[0] == 'p' && ptr[1] == 'a' && ptr[2] == 'r' && ptr[3] == 't')
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| 309 | return 4 + addendum;
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| 310 | if (ptr[n - 2] == 'm' && ptr[n - 1] == 't')
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| 311 | return 5 + addendum;
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| 312 | return 0;
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[821] | 313 | }
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| 314 |
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[1770] | 315 | static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr)
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[821] | 316 | {
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[1770] | 317 | if (d[0] == 's' && d[1] == 'c' && d[2] == 's' && d[3] == 'i' && d[4] == '/') {
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| 318 | if (d[n - 7] == 'g' && d[n - 6] == 'e' && d[n - 5] == 'n'
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| 319 | && d[n - 4] == 'e' && d[n - 3] == 'r' && d[n - 2] == 'i' && d[n - 1] == 'c'
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| 320 | )
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[821] | 321 | return 1;
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| 322 | return scan_dev_name_common(d, n, 0, ptr);
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| 323 | }
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[1770] | 324 | if (d[0] == 'i' && d[1] == 'd' && d[2] == 'e' && d[3] == '/'
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| 325 | && d[4] == 'h' && d[5] == 'o' && d[6] == 's' && d[7] == 't'
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| 326 | )
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[821] | 327 | return scan_dev_name_common(d, n, 4, ptr);
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[1770] | 328 | if (d[0] == 's' && d[1] == 'b' && d[2] == 'p' && d[3] == '/')
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[821] | 329 | return 10;
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[1770] | 330 | if (d[0] == 'v' && d[1] == 'c' && d[2] == 'c' && d[3] == '/')
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[821] | 331 | return 11;
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[1770] | 332 | if (d[0] == 'p' && d[1] == 't' && d[2] == 'y' && d[3] == '/')
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[821] | 333 | return 12;
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| 334 | return 0;
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| 335 | }
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| 336 |
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| 337 | /* Public functions follow */
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| 338 |
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[1770] | 339 | int devfsd_main(int argc, char **argv);
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| 340 | int devfsd_main(int argc, char **argv)
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[821] | 341 | {
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| 342 | int print_version = FALSE;
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| 343 | int do_daemon = TRUE;
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| 344 | int no_polling = FALSE;
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| 345 | int do_scan;
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| 346 | int fd, proto_rev, count;
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| 347 | unsigned long event_mask = 0;
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| 348 | struct sigaction new_action;
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| 349 | struct initial_symlink_struct *curr;
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| 350 |
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| 351 | if (argc < 2)
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| 352 | bb_show_usage();
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| 353 |
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[1770] | 354 | for (count = 2; count < argc; ++count) {
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| 355 | if (argv[count][0] == '-') {
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| 356 | if (argv[count][1] == 'v' && !argv[count][2]) /* -v */
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| 357 | print_version = TRUE;
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| 358 | else if (ENABLE_DEVFSD_FG_NP && argv[count][1] == 'f'
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| 359 | && argv[count][2] == 'g' && !argv[count][3]) /* -fg */
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| 360 | do_daemon = FALSE;
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| 361 | else if (ENABLE_DEVFSD_FG_NP && argv[count][1] == 'n'
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| 362 | && argv[count][2] == 'p' && !argv[count][3]) /* -np */
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| 363 | no_polling = TRUE;
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[821] | 364 | else
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| 365 | bb_show_usage();
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| 366 | }
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| 367 | }
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| 368 |
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[1770] | 369 | mount_point = bb_simplify_path(argv[1]);
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[821] | 370 |
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[1770] | 371 | xchdir(mount_point);
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[821] | 372 |
|
---|
[1770] | 373 | fd = xopen(".devfsd", O_RDONLY);
|
---|
[821] | 374 |
|
---|
[1770] | 375 | if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
|
---|
| 376 | bb_perror_msg_and_die("FD_CLOEXEC");
|
---|
[821] | 377 |
|
---|
[1770] | 378 | xioctl(fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev);
|
---|
[821] | 379 |
|
---|
| 380 | /*setup initial entries */
|
---|
[1770] | 381 | for (curr = initial_symlinks; curr->dest != NULL; ++curr)
|
---|
| 382 | symlink(curr->dest, curr->name);
|
---|
[821] | 383 |
|
---|
| 384 | /* NB: The check for CONFIG_FILE is done in read_config_file() */
|
---|
| 385 |
|
---|
[1770] | 386 | if (print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)) {
|
---|
| 387 | printf("%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
|
---|
| 388 | applet_name, DEVFSD_VERSION, bb_msg_proto_rev,
|
---|
| 389 | DEVFSD_PROTOCOL_REVISION_DAEMON, bb_msg_proto_rev, proto_rev);
|
---|
[821] | 390 | if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
|
---|
[1770] | 391 | bb_error_msg_and_die("%s mismatch!", bb_msg_proto_rev);
|
---|
[821] | 392 | exit(EXIT_SUCCESS); /* -v */
|
---|
| 393 | }
|
---|
[1770] | 394 | /* Tell kernel we are special(i.e. we get to see hidden entries) */
|
---|
| 395 | xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
|
---|
[821] | 396 |
|
---|
[1770] | 397 | sigemptyset(&new_action.sa_mask);
|
---|
[821] | 398 | new_action.sa_flags = 0;
|
---|
| 399 |
|
---|
| 400 | /* Set up SIGHUP and SIGUSR1 handlers */
|
---|
| 401 | new_action.sa_handler = signal_handler;
|
---|
[1770] | 402 | if (sigaction(SIGHUP, &new_action, NULL) != 0 || sigaction(SIGUSR1, &new_action, NULL) != 0)
|
---|
| 403 | bb_error_msg_and_die("sigaction");
|
---|
[821] | 404 |
|
---|
[1770] | 405 | printf("%s v%s started for %s\n",applet_name, DEVFSD_VERSION, mount_point);
|
---|
[821] | 406 |
|
---|
| 407 | /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
|
---|
[1770] | 408 | umask(0);
|
---|
| 409 | read_config_file((char*)CONFIG_FILE, FALSE, &event_mask);
|
---|
[821] | 410 | /* Do the scan before forking, so that boot scripts see the finished product */
|
---|
[1770] | 411 | dir_operation(SERVICE, mount_point, 0, NULL);
|
---|
[821] | 412 |
|
---|
| 413 | if (ENABLE_DEVFSD_FG_NP && no_polling)
|
---|
[1770] | 414 | exit(0);
|
---|
| 415 |
|
---|
| 416 | if (ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG)
|
---|
| 417 | logmode = LOGMODE_BOTH;
|
---|
| 418 | else if (do_daemon == TRUE)
|
---|
| 419 | logmode = LOGMODE_SYSLOG;
|
---|
| 420 | /* This is the default */
|
---|
| 421 | /*else
|
---|
| 422 | logmode = LOGMODE_STDIO; */
|
---|
| 423 |
|
---|
| 424 | if (do_daemon) {
|
---|
[821] | 425 | /* Release so that the child can grab it */
|
---|
[1770] | 426 | xioctl(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
|
---|
| 427 | bb_daemonize_or_rexec(0, argv);
|
---|
| 428 | } else if (ENABLE_DEVFSD_FG_NP) {
|
---|
| 429 | setpgid(0, 0); /* Become process group leader */
|
---|
[821] | 430 | }
|
---|
| 431 |
|
---|
[1770] | 432 | while (TRUE) {
|
---|
| 433 | do_scan = do_servicing(fd, event_mask);
|
---|
[821] | 434 |
|
---|
[1770] | 435 | free_config();
|
---|
| 436 | read_config_file((char*)CONFIG_FILE, FALSE, &event_mask);
|
---|
[821] | 437 | if (do_scan)
|
---|
[1770] | 438 | dir_operation(SERVICE, mount_point, 0, NULL);
|
---|
[821] | 439 | }
|
---|
[1770] | 440 | if (ENABLE_FEATURE_CLEAN_UP) free(mount_point);
|
---|
[821] | 441 | } /* End Function main */
|
---|
| 442 |
|
---|
| 443 |
|
---|
| 444 | /* Private functions follow */
|
---|
| 445 |
|
---|
[1770] | 446 | static void read_config_file(char *path, int optional, unsigned long *event_mask)
|
---|
[821] | 447 | /* [SUMMARY] Read a configuration database.
|
---|
| 448 | <path> The path to read the database from. If this is a directory, all
|
---|
[1770] | 449 | entries in that directory will be read(except hidden entries).
|
---|
[821] | 450 | <optional> If TRUE, the routine will silently ignore a missing config file.
|
---|
| 451 | <event_mask> The event mask is written here. This is not initialised.
|
---|
| 452 | [RETURNS] Nothing.
|
---|
| 453 | */
|
---|
| 454 | {
|
---|
| 455 | struct stat statbuf;
|
---|
| 456 | FILE *fp;
|
---|
| 457 | char buf[STRING_LENGTH];
|
---|
[1770] | 458 | char *line = NULL;
|
---|
| 459 | char *p;
|
---|
[821] | 460 |
|
---|
[1770] | 461 | if (stat(path, &statbuf) == 0) {
|
---|
[821] | 462 | /* Don't read 0 length files: ignored */
|
---|
[1770] | 463 | /*if (statbuf.st_size == 0)
|
---|
[821] | 464 | return;*/
|
---|
[1770] | 465 | if (S_ISDIR(statbuf.st_mode)) {
|
---|
| 466 | p = bb_simplify_path(path);
|
---|
| 467 | dir_operation(READ_CONFIG, p, 0, event_mask);
|
---|
| 468 | free(p);
|
---|
[821] | 469 | return;
|
---|
| 470 | }
|
---|
[1770] | 471 | if ((fp = fopen(path, "r")) != NULL) {
|
---|
| 472 | while (fgets(buf, STRING_LENGTH, fp) != NULL) {
|
---|
[821] | 473 | /* Skip whitespace */
|
---|
[1770] | 474 | line = buf;
|
---|
| 475 | line = skip_whitespace(line);
|
---|
| 476 | if (line[0] == '\0' || line[0] == '#')
|
---|
[821] | 477 | continue;
|
---|
[1770] | 478 | process_config_line(line, event_mask);
|
---|
[821] | 479 | }
|
---|
[1770] | 480 | fclose(fp);
|
---|
[821] | 481 | } else {
|
---|
| 482 | goto read_config_file_err;
|
---|
| 483 | }
|
---|
| 484 | } else {
|
---|
| 485 | read_config_file_err:
|
---|
[1770] | 486 | if (optional == 0 && errno == ENOENT)
|
---|
| 487 | error_logger_and_die(LOG_ERR, "read config file: %s", path);
|
---|
[821] | 488 | }
|
---|
| 489 | } /* End Function read_config_file */
|
---|
| 490 |
|
---|
[1770] | 491 | static void process_config_line(const char *line, unsigned long *event_mask)
|
---|
[821] | 492 | /* [SUMMARY] Process a line from a configuration file.
|
---|
| 493 | <line> The configuration line.
|
---|
| 494 | <event_mask> The event mask is written here. This is not initialised.
|
---|
| 495 | [RETURNS] Nothing.
|
---|
| 496 | */
|
---|
| 497 | {
|
---|
| 498 | int num_args, count;
|
---|
| 499 | struct config_entry_struct *new;
|
---|
| 500 | char p[MAX_ARGS][STRING_LENGTH];
|
---|
| 501 | char when[STRING_LENGTH], what[STRING_LENGTH];
|
---|
| 502 | char name[STRING_LENGTH];
|
---|
[1770] | 503 | const char *msg = "";
|
---|
[821] | 504 | char *ptr;
|
---|
| 505 | int i;
|
---|
| 506 |
|
---|
| 507 | /* !!!! Only Uppercase Keywords in devsfd.conf */
|
---|
[1770] | 508 | static const char options[] ALIGN1 =
|
---|
| 509 | "CLEAR_CONFIG\0""INCLUDE\0""OPTIONAL_INCLUDE\0"
|
---|
| 510 | "RESTORE\0""PERMISSIONS\0""MODLOAD\0""EXECUTE\0"
|
---|
| 511 | "COPY\0""IGNORE\0""MKOLDCOMPAT\0""MKNEWCOMPAT\0"
|
---|
| 512 | "RMOLDCOMPAT\0""RMNEWCOMPAT\0";
|
---|
[821] | 513 |
|
---|
[1770] | 514 | for (count = 0; count < MAX_ARGS; ++count)
|
---|
| 515 | p[count][0] = '\0';
|
---|
| 516 | num_args = sscanf(line, "%s %s %s %s %s %s %s %s %s %s",
|
---|
[821] | 517 | when, name, what,
|
---|
| 518 | p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
|
---|
| 519 |
|
---|
[1770] | 520 | i = index_in_strings(options, when);
|
---|
[821] | 521 |
|
---|
[1770] | 522 | /* "CLEAR_CONFIG" */
|
---|
| 523 | if (i == 0) {
|
---|
| 524 | free_config();
|
---|
[821] | 525 | *event_mask = 0;
|
---|
| 526 | return;
|
---|
| 527 | }
|
---|
| 528 |
|
---|
[1770] | 529 | if (num_args < 2)
|
---|
[821] | 530 | goto process_config_line_err;
|
---|
| 531 |
|
---|
| 532 | /* "INCLUDE" & "OPTIONAL_INCLUDE" */
|
---|
[1770] | 533 | if (i == 1 || i == 2) {
|
---|
| 534 | st_expr_expand(name, STRING_LENGTH, name, get_variable, NULL);
|
---|
| 535 | info_logger(LOG_INFO, "%sinclude: %s", (toupper(when[0]) == 'I') ? "": "optional_", name);
|
---|
| 536 | read_config_file(name, (toupper(when[0]) == 'I') ? FALSE : TRUE, event_mask);
|
---|
[821] | 537 | return;
|
---|
| 538 | }
|
---|
| 539 | /* "RESTORE" */
|
---|
[1770] | 540 | if (i == 3) {
|
---|
| 541 | dir_operation(RESTORE, name, strlen(name),NULL);
|
---|
[821] | 542 | return;
|
---|
| 543 | }
|
---|
| 544 | if (num_args < 3)
|
---|
| 545 | goto process_config_line_err;
|
---|
| 546 |
|
---|
[1770] | 547 | new = xzalloc(sizeof *new);
|
---|
[821] | 548 |
|
---|
[1770] | 549 | for (count = 0; event_types[count].config_name != NULL; ++count) {
|
---|
| 550 | if (strcasecmp(when, event_types[count].config_name) != 0)
|
---|
[821] | 551 | continue;
|
---|
| 552 | new->action.when = event_types[count].type;
|
---|
| 553 | break;
|
---|
| 554 | }
|
---|
[1770] | 555 | if (event_types[count].config_name == NULL) {
|
---|
| 556 | msg = "WHEN in";
|
---|
[821] | 557 | goto process_config_line_err;
|
---|
| 558 | }
|
---|
| 559 |
|
---|
[1770] | 560 | i = index_in_strings(options, what);
|
---|
[821] | 561 |
|
---|
[1770] | 562 | switch (i) {
|
---|
[821] | 563 | case 4: /* "PERMISSIONS" */
|
---|
| 564 | new->action.what = AC_PERMISSIONS;
|
---|
| 565 | /* Get user and group */
|
---|
[1770] | 566 | if ((ptr = strchr(p[0], '.')) == NULL) {
|
---|
| 567 | msg = "UID.GID";
|
---|
[821] | 568 | goto process_config_line_err; /*"missing '.' in UID.GID"*/
|
---|
| 569 | }
|
---|
| 570 |
|
---|
| 571 | *ptr++ = '\0';
|
---|
[1770] | 572 | new->u.permissions.uid = get_uid_gid(UID, p[0]);
|
---|
| 573 | new->u.permissions.gid = get_uid_gid(GID, ptr);
|
---|
[821] | 574 | /* Get mode */
|
---|
[1770] | 575 | new->u.permissions.mode = get_mode(p[1]);
|
---|
[821] | 576 | break;
|
---|
| 577 | case 5: /* MODLOAD */
|
---|
[1770] | 578 | /*This action will pass "/dev/$devname"(i.e. "/dev/" prefixed to
|
---|
[821] | 579 | the device name) to the module loading facility. In addition,
|
---|
| 580 | the /etc/modules.devfs configuration file is used.*/
|
---|
| 581 | if (ENABLE_DEVFSD_MODLOAD)
|
---|
| 582 | new->action.what = AC_MODLOAD;
|
---|
| 583 | break;
|
---|
| 584 | case 6: /* EXECUTE */
|
---|
| 585 | new->action.what = AC_EXECUTE;
|
---|
| 586 | num_args -= 3;
|
---|
| 587 |
|
---|
| 588 | for (count = 0; count < num_args; ++count)
|
---|
[1770] | 589 | new->u.execute.argv[count] = xstrdup(p[count]);
|
---|
[821] | 590 |
|
---|
| 591 | new->u.execute.argv[num_args] = NULL;
|
---|
| 592 | break;
|
---|
| 593 | case 7: /* COPY */
|
---|
| 594 | new->action.what = AC_COPY;
|
---|
| 595 | num_args -= 3;
|
---|
| 596 | if (num_args != 2)
|
---|
| 597 | goto process_config_line_err; /* missing path and function in line */
|
---|
| 598 |
|
---|
[1770] | 599 | new->u.copy.source = xstrdup(p[0]);
|
---|
| 600 | new->u.copy.destination = xstrdup(p[1]);
|
---|
[821] | 601 | break;
|
---|
| 602 | case 8: /* IGNORE */
|
---|
| 603 | /* FALLTROUGH */
|
---|
| 604 | case 9: /* MKOLDCOMPAT */
|
---|
| 605 | /* FALLTROUGH */
|
---|
| 606 | case 10: /* MKNEWCOMPAT */
|
---|
| 607 | /* FALLTROUGH */
|
---|
| 608 | case 11:/* RMOLDCOMPAT */
|
---|
| 609 | /* FALLTROUGH */
|
---|
| 610 | case 12: /* RMNEWCOMPAT */
|
---|
| 611 | /* AC_IGNORE 6
|
---|
| 612 | AC_MKOLDCOMPAT 7
|
---|
| 613 | AC_MKNEWCOMPAT 8
|
---|
| 614 | AC_RMOLDCOMPAT 9
|
---|
| 615 | AC_RMNEWCOMPAT 10*/
|
---|
| 616 | new->action.what = i - 2;
|
---|
| 617 | break;
|
---|
| 618 | default:
|
---|
[1770] | 619 | msg = "WHAT in";
|
---|
[821] | 620 | goto process_config_line_err;
|
---|
| 621 | /*esac*/
|
---|
| 622 | } /* switch (i) */
|
---|
| 623 |
|
---|
[1770] | 624 | xregcomp(&new->preg, name, REG_EXTENDED);
|
---|
[821] | 625 |
|
---|
| 626 | *event_mask |= 1 << new->action.when;
|
---|
| 627 | new->next = NULL;
|
---|
| 628 | if (first_config == NULL)
|
---|
| 629 | first_config = new;
|
---|
| 630 | else
|
---|
| 631 | last_config->next = new;
|
---|
| 632 | last_config = new;
|
---|
| 633 | return;
|
---|
[1770] | 634 |
|
---|
| 635 | process_config_line_err:
|
---|
[821] | 636 | msg_logger_and_die(LOG_ERR, bb_msg_bad_config, msg , line);
|
---|
| 637 | } /* End Function process_config_line */
|
---|
| 638 |
|
---|
[1770] | 639 | static int do_servicing(int fd, unsigned long event_mask)
|
---|
[821] | 640 | /* [SUMMARY] Service devfs changes until a signal is received.
|
---|
| 641 | <fd> The open control file.
|
---|
| 642 | <event_mask> The event mask.
|
---|
| 643 | [RETURNS] TRUE if SIGHUP was caught, else FALSE.
|
---|
| 644 | */
|
---|
| 645 | {
|
---|
| 646 | ssize_t bytes;
|
---|
| 647 | struct devfsd_notify_struct info;
|
---|
| 648 |
|
---|
[1770] | 649 | /* (void*) cast is only in order to match prototype */
|
---|
| 650 | xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, (void*)event_mask);
|
---|
| 651 | while (!caught_signal) {
|
---|
[821] | 652 | errno = 0;
|
---|
[1770] | 653 | bytes = read(fd,(char *) &info, sizeof info);
|
---|
[821] | 654 | if (caught_signal)
|
---|
| 655 | break; /* Must test for this first */
|
---|
| 656 | if (errno == EINTR)
|
---|
| 657 | continue; /* Yes, the order is important */
|
---|
| 658 | if (bytes < 1)
|
---|
| 659 | break;
|
---|
[1770] | 660 | service_name(&info);
|
---|
[821] | 661 | }
|
---|
[1770] | 662 | if (caught_signal) {
|
---|
[821] | 663 | int c_sighup = caught_sighup;
|
---|
| 664 |
|
---|
| 665 | caught_signal = FALSE;
|
---|
| 666 | caught_sighup = FALSE;
|
---|
[1770] | 667 | return c_sighup;
|
---|
[821] | 668 | }
|
---|
| 669 | msg_logger_and_die(LOG_ERR, "read error on control file");
|
---|
| 670 | } /* End Function do_servicing */
|
---|
| 671 |
|
---|
[1770] | 672 | static void service_name(const struct devfsd_notify_struct *info)
|
---|
[821] | 673 | /* [SUMMARY] Service a single devfs change.
|
---|
| 674 | <info> The devfs change.
|
---|
| 675 | [RETURNS] Nothing.
|
---|
| 676 | */
|
---|
| 677 | {
|
---|
| 678 | unsigned int n;
|
---|
| 679 | regmatch_t mbuf[MAX_SUBEXPR];
|
---|
| 680 | struct config_entry_struct *entry;
|
---|
| 681 |
|
---|
| 682 | if (ENABLE_DEBUG && info->overrun_count > 0)
|
---|
[1770] | 683 | msg_logger(LOG_ERR, "lost %u events", info->overrun_count);
|
---|
[821] | 684 |
|
---|
| 685 | /* Discard lookups on "/dev/log" and "/dev/initctl" */
|
---|
[1770] | 686 | if (info->type == DEVFSD_NOTIFY_LOOKUP
|
---|
| 687 | && ((info->devname[0] == 'l' && info->devname[1] == 'o'
|
---|
| 688 | && info->devname[2] == 'g' && !info->devname[3])
|
---|
| 689 | || (info->devname[0] == 'i' && info->devname[1] == 'n'
|
---|
| 690 | && info->devname[2] == 'i' && info->devname[3] == 't'
|
---|
| 691 | && info->devname[4] == 'c' && info->devname[5] == 't'
|
---|
| 692 | && info->devname[6] == 'l' && !info->devname[7]))
|
---|
| 693 | )
|
---|
| 694 | return;
|
---|
| 695 |
|
---|
| 696 | for (entry = first_config; entry != NULL; entry = entry->next) {
|
---|
[821] | 697 | /* First check if action matches the type, then check if name matches */
|
---|
[1770] | 698 | if (info->type != entry->action.when
|
---|
| 699 | || regexec(&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0)
|
---|
[821] | 700 | continue;
|
---|
[1770] | 701 | for (n = 0;(n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
|
---|
[821] | 702 | /* VOID */;
|
---|
| 703 |
|
---|
[1770] | 704 | switch (entry->action.what) {
|
---|
[821] | 705 | case AC_PERMISSIONS:
|
---|
[1770] | 706 | action_permissions(info, entry);
|
---|
[821] | 707 | break;
|
---|
| 708 | case AC_MODLOAD:
|
---|
[1770] | 709 | if (ENABLE_DEVFSD_MODLOAD)
|
---|
| 710 | action_modload(info, entry);
|
---|
[821] | 711 | break;
|
---|
| 712 | case AC_EXECUTE:
|
---|
[1770] | 713 | action_execute(info, entry, mbuf, n);
|
---|
[821] | 714 | break;
|
---|
| 715 | case AC_COPY:
|
---|
[1770] | 716 | action_copy(info, entry, mbuf, n);
|
---|
[821] | 717 | break;
|
---|
| 718 | case AC_IGNORE:
|
---|
| 719 | return;
|
---|
| 720 | /*break;*/
|
---|
| 721 | case AC_MKOLDCOMPAT:
|
---|
| 722 | case AC_MKNEWCOMPAT:
|
---|
| 723 | case AC_RMOLDCOMPAT:
|
---|
| 724 | case AC_RMNEWCOMPAT:
|
---|
[1770] | 725 | action_compat(info, entry->action.what);
|
---|
[821] | 726 | break;
|
---|
| 727 | default:
|
---|
| 728 | msg_logger_and_die(LOG_ERR, "Unknown action");
|
---|
| 729 | }
|
---|
| 730 | }
|
---|
| 731 | } /* End Function service_name */
|
---|
| 732 |
|
---|
[1770] | 733 | static void action_permissions(const struct devfsd_notify_struct *info,
|
---|
[821] | 734 | const struct config_entry_struct *entry)
|
---|
| 735 | /* [SUMMARY] Update permissions for a device entry.
|
---|
| 736 | <info> The devfs change.
|
---|
| 737 | <entry> The config file entry.
|
---|
| 738 | [RETURNS] Nothing.
|
---|
| 739 | */
|
---|
| 740 | {
|
---|
| 741 | struct stat statbuf;
|
---|
| 742 |
|
---|
[1770] | 743 | if (stat(info->devname, &statbuf) != 0
|
---|
| 744 | || chmod(info->devname, (statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0
|
---|
| 745 | || chown(info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0
|
---|
| 746 | )
|
---|
| 747 | error_logger(LOG_ERR, "Can't chmod or chown: %s", info->devname);
|
---|
[821] | 748 | } /* End Function action_permissions */
|
---|
| 749 |
|
---|
[1770] | 750 | static void action_modload(const struct devfsd_notify_struct *info,
|
---|
[821] | 751 | const struct config_entry_struct *entry ATTRIBUTE_UNUSED)
|
---|
| 752 | /* [SUMMARY] Load a module.
|
---|
| 753 | <info> The devfs change.
|
---|
| 754 | <entry> The config file entry.
|
---|
| 755 | [RETURNS] Nothing.
|
---|
| 756 | */
|
---|
| 757 | {
|
---|
| 758 | char *argv[6];
|
---|
| 759 |
|
---|
[1770] | 760 | argv[0] = (char*)MODPROBE;
|
---|
| 761 | argv[1] = (char*)MODPROBE_SWITCH_1; /* "-k" */
|
---|
| 762 | argv[2] = (char*)MODPROBE_SWITCH_2; /* "-C" */
|
---|
| 763 | argv[3] = (char*)CONFIG_MODULES_DEVFS;
|
---|
| 764 | argv[4] = concat_path_file("/dev", info->devname); /* device */
|
---|
[821] | 765 | argv[5] = NULL;
|
---|
| 766 |
|
---|
[1770] | 767 | wait4pid(xspawn(argv));
|
---|
| 768 | free(argv[4]);
|
---|
[821] | 769 | } /* End Function action_modload */
|
---|
| 770 |
|
---|
[1770] | 771 | static void action_execute(const struct devfsd_notify_struct *info,
|
---|
[821] | 772 | const struct config_entry_struct *entry,
|
---|
| 773 | const regmatch_t *regexpr, unsigned int numexpr)
|
---|
| 774 | /* [SUMMARY] Execute a programme.
|
---|
| 775 | <info> The devfs change.
|
---|
| 776 | <entry> The config file entry.
|
---|
[1770] | 777 | <regexpr> The number of subexpression(start, end) offsets within the
|
---|
[821] | 778 | device name.
|
---|
| 779 | <numexpr> The number of elements within <<regexpr>>.
|
---|
| 780 | [RETURNS] Nothing.
|
---|
| 781 | */
|
---|
| 782 | {
|
---|
| 783 | unsigned int count;
|
---|
| 784 | struct get_variable_info gv_info;
|
---|
| 785 | char *argv[MAX_ARGS + 1];
|
---|
| 786 | char largv[MAX_ARGS + 1][STRING_LENGTH];
|
---|
| 787 |
|
---|
| 788 | gv_info.info = info;
|
---|
| 789 | gv_info.devname = info->devname;
|
---|
[1770] | 790 | snprintf(gv_info.devpath, sizeof(gv_info.devpath), "%s/%s", mount_point, info->devname);
|
---|
| 791 | for (count = 0; entry->u.execute.argv[count] != NULL; ++count) {
|
---|
| 792 | expand_expression(largv[count], STRING_LENGTH,
|
---|
[821] | 793 | entry->u.execute.argv[count],
|
---|
| 794 | get_variable, &gv_info,
|
---|
[1770] | 795 | gv_info.devname, regexpr, numexpr);
|
---|
[821] | 796 | argv[count] = largv[count];
|
---|
| 797 | }
|
---|
| 798 | argv[count] = NULL;
|
---|
[1770] | 799 | wait4pid(spawn(argv));
|
---|
[821] | 800 | } /* End Function action_execute */
|
---|
| 801 |
|
---|
| 802 |
|
---|
[1770] | 803 | static void action_copy(const struct devfsd_notify_struct *info,
|
---|
[821] | 804 | const struct config_entry_struct *entry,
|
---|
| 805 | const regmatch_t *regexpr, unsigned int numexpr)
|
---|
| 806 | /* [SUMMARY] Copy permissions.
|
---|
| 807 | <info> The devfs change.
|
---|
| 808 | <entry> The config file entry.
|
---|
[1770] | 809 | <regexpr> This list of subexpression(start, end) offsets within the
|
---|
[821] | 810 | device name.
|
---|
| 811 | <numexpr> The number of elements in <<regexpr>>.
|
---|
| 812 | [RETURNS] Nothing.
|
---|
| 813 | */
|
---|
| 814 | {
|
---|
| 815 | mode_t new_mode;
|
---|
| 816 | struct get_variable_info gv_info;
|
---|
| 817 | struct stat source_stat, dest_stat;
|
---|
| 818 | char source[STRING_LENGTH], destination[STRING_LENGTH];
|
---|
| 819 | int ret = 0;
|
---|
| 820 |
|
---|
| 821 | dest_stat.st_mode = 0;
|
---|
| 822 |
|
---|
[1770] | 823 | if ((info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK(info->mode))
|
---|
[821] | 824 | return;
|
---|
| 825 | gv_info.info = info;
|
---|
| 826 | gv_info.devname = info->devname;
|
---|
| 827 |
|
---|
[1770] | 828 | snprintf(gv_info.devpath, sizeof(gv_info.devpath), "%s/%s", mount_point, info->devname);
|
---|
| 829 | expand_expression(source, STRING_LENGTH, entry->u.copy.source,
|
---|
[821] | 830 | get_variable, &gv_info, gv_info.devname,
|
---|
| 831 | regexpr, numexpr);
|
---|
| 832 |
|
---|
[1770] | 833 | expand_expression(destination, STRING_LENGTH, entry->u.copy.destination,
|
---|
[821] | 834 | get_variable, &gv_info, gv_info.devname,
|
---|
| 835 | regexpr, numexpr);
|
---|
| 836 |
|
---|
[1770] | 837 | if (!make_dir_tree(destination) || lstat(source, &source_stat) != 0)
|
---|
[821] | 838 | return;
|
---|
[1770] | 839 | lstat(destination, &dest_stat);
|
---|
[821] | 840 | new_mode = source_stat.st_mode & ~S_ISVTX;
|
---|
| 841 | if (info->type == DEVFSD_NOTIFY_CREATE)
|
---|
| 842 | new_mode |= S_ISVTX;
|
---|
[1770] | 843 | else if ((info->type == DEVFSD_NOTIFY_CHANGE) &&(dest_stat.st_mode & S_ISVTX))
|
---|
[821] | 844 | new_mode |= S_ISVTX;
|
---|
[1770] | 845 | ret = copy_inode(destination, &dest_stat, new_mode, source, &source_stat);
|
---|
[821] | 846 | if (ENABLE_DEBUG && ret && (errno != EEXIST))
|
---|
[1770] | 847 | error_logger(LOG_ERR, "copy_inode: %s to %s", source, destination);
|
---|
[821] | 848 | } /* End Function action_copy */
|
---|
| 849 |
|
---|
[1770] | 850 | static void action_compat(const struct devfsd_notify_struct *info, unsigned int action)
|
---|
[821] | 851 | /* [SUMMARY] Process a compatibility request.
|
---|
| 852 | <info> The devfs change.
|
---|
| 853 | <action> The action to take.
|
---|
| 854 | [RETURNS] Nothing.
|
---|
| 855 | */
|
---|
| 856 | {
|
---|
| 857 | int ret;
|
---|
| 858 | const char *compat_name = NULL;
|
---|
| 859 | const char *dest_name = info->devname;
|
---|
[1770] | 860 | const char *ptr;
|
---|
[821] | 861 | char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
|
---|
| 862 | int mode, host, bus, target, lun;
|
---|
| 863 | unsigned int i;
|
---|
| 864 | char rewind_;
|
---|
| 865 | /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
|
---|
| 866 | static const char *const fmt[] = {
|
---|
| 867 | NULL ,
|
---|
| 868 | "sg/c%db%dt%du%d", /* scsi/generic */
|
---|
| 869 | "sd/c%db%dt%du%d", /* scsi/disc */
|
---|
| 870 | "sr/c%db%dt%du%d", /* scsi/cd */
|
---|
| 871 | "sd/c%db%dt%du%dp%d", /* scsi/part */
|
---|
| 872 | "st/c%db%dt%du%dm%d%c", /* scsi/mt */
|
---|
| 873 | "ide/hd/c%db%dt%du%d", /* ide/host/disc */
|
---|
| 874 | "ide/cd/c%db%dt%du%d", /* ide/host/cd */
|
---|
| 875 | "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
|
---|
| 876 | "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
|
---|
| 877 | NULL
|
---|
| 878 | };
|
---|
| 879 |
|
---|
| 880 | /* First construct compatibility name */
|
---|
[1770] | 881 | switch (action) {
|
---|
[821] | 882 | case AC_MKOLDCOMPAT:
|
---|
| 883 | case AC_RMOLDCOMPAT:
|
---|
[1770] | 884 | compat_name = get_old_name(info->devname, info->namelen, compat_buf, info->major, info->minor);
|
---|
[821] | 885 | break;
|
---|
| 886 | case AC_MKNEWCOMPAT:
|
---|
| 887 | case AC_RMNEWCOMPAT:
|
---|
[1770] | 888 | ptr = bb_basename(info->devname);
|
---|
| 889 | i = scan_dev_name(info->devname, info->namelen, ptr);
|
---|
[821] | 890 |
|
---|
| 891 | /* nothing found */
|
---|
[1770] | 892 | if (i == 0 || i > 9)
|
---|
[821] | 893 | return;
|
---|
| 894 |
|
---|
[1770] | 895 | sscanf(info->devname + ((i < 6) ? 5 : 4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
|
---|
| 896 | snprintf(dest_buf, sizeof(dest_buf), "../%s", info->devname + (( i > 5) ? 4 : 0));
|
---|
[821] | 897 | dest_name = dest_buf;
|
---|
| 898 | compat_name = compat_buf;
|
---|
| 899 |
|
---|
| 900 |
|
---|
| 901 | /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
|
---|
[1770] | 902 | if (i == 1 || i == 2 || i == 3 || i == 6 || i ==7)
|
---|
| 903 | sprintf(compat_buf, fmt[i], host, bus, target, lun);
|
---|
[821] | 904 |
|
---|
| 905 | /* 4 == scsi/part 8 == ide/host/part */
|
---|
[1770] | 906 | if (i == 4 || i == 8)
|
---|
| 907 | sprintf(compat_buf, fmt[i], host, bus, target, lun, atoi(ptr + 4));
|
---|
[821] | 908 |
|
---|
| 909 | /* 5 == scsi/mt */
|
---|
[1770] | 910 | if (i == 5) {
|
---|
[821] | 911 | rewind_ = info->devname[info->namelen - 1];
|
---|
| 912 | if (rewind_ != 'n')
|
---|
| 913 | rewind_ = '\0';
|
---|
| 914 | mode=0;
|
---|
[1770] | 915 | if (ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
|
---|
[821] | 916 | mode = ptr[2] - 107; /* 1 or 2 */
|
---|
[1770] | 917 | if (ptr[2] == 'a')
|
---|
[821] | 918 | mode = 3;
|
---|
[1770] | 919 | sprintf(compat_buf, fmt[i], host, bus, target, lun, mode, rewind_);
|
---|
[821] | 920 | }
|
---|
| 921 |
|
---|
| 922 | /* 9 == ide/host/mt */
|
---|
[1770] | 923 | if (i == 9)
|
---|
| 924 | snprintf(compat_buf, sizeof(compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
|
---|
[821] | 925 | /* esac */
|
---|
[1770] | 926 | } /* switch (action) */
|
---|
[821] | 927 |
|
---|
[1770] | 928 | if (compat_name == NULL)
|
---|
[821] | 929 | return;
|
---|
| 930 |
|
---|
| 931 | /* Now decide what to do with it */
|
---|
[1770] | 932 | switch (action) {
|
---|
[821] | 933 | case AC_MKOLDCOMPAT:
|
---|
| 934 | case AC_MKNEWCOMPAT:
|
---|
[1770] | 935 | mksymlink(dest_name, compat_name);
|
---|
[821] | 936 | break;
|
---|
| 937 | case AC_RMOLDCOMPAT:
|
---|
| 938 | case AC_RMNEWCOMPAT:
|
---|
[1770] | 939 | ret = unlink(compat_name);
|
---|
[821] | 940 | if (ENABLE_DEBUG && ret)
|
---|
[1770] | 941 | error_logger(LOG_ERR, "unlink: %s", compat_name);
|
---|
[821] | 942 | break;
|
---|
| 943 | /*esac*/
|
---|
[1770] | 944 | } /* switch (action) */
|
---|
[821] | 945 | } /* End Function action_compat */
|
---|
| 946 |
|
---|
| 947 | static void restore(char *spath, struct stat source_stat, int rootlen)
|
---|
| 948 | {
|
---|
[1770] | 949 | char *dpath;
|
---|
[821] | 950 | struct stat dest_stat;
|
---|
| 951 |
|
---|
| 952 | dest_stat.st_mode = 0;
|
---|
[1770] | 953 | dpath = concat_path_file(mount_point, spath + rootlen);
|
---|
| 954 | lstat(dpath, &dest_stat);
|
---|
| 955 | free(dpath);
|
---|
| 956 | if (S_ISLNK(source_stat.st_mode) || (source_stat.st_mode & S_ISVTX))
|
---|
| 957 | copy_inode(dpath, &dest_stat,(source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
|
---|
[821] | 958 |
|
---|
[1770] | 959 | if (S_ISDIR(source_stat.st_mode))
|
---|
[821] | 960 | dir_operation(RESTORE, spath, rootlen,NULL);
|
---|
| 961 | }
|
---|
| 962 |
|
---|
| 963 |
|
---|
[1770] | 964 | static int copy_inode(const char *destpath, const struct stat *dest_stat,
|
---|
[821] | 965 | mode_t new_mode,
|
---|
| 966 | const char *sourcepath, const struct stat *source_stat)
|
---|
| 967 | /* [SUMMARY] Copy an inode.
|
---|
| 968 | <destpath> The destination path. An existing inode may be deleted.
|
---|
| 969 | <dest_stat> The destination stat(2) information.
|
---|
| 970 | <new_mode> The desired new mode for the destination.
|
---|
| 971 | <sourcepath> The source path.
|
---|
| 972 | <source_stat> The source stat(2) information.
|
---|
| 973 | [RETURNS] TRUE on success, else FALSE.
|
---|
| 974 | */
|
---|
| 975 | {
|
---|
| 976 | int source_len, dest_len;
|
---|
| 977 | char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
|
---|
| 978 | int fd, val;
|
---|
| 979 | struct sockaddr_un un_addr;
|
---|
| 980 | char symlink_val[STRING_LENGTH];
|
---|
| 981 |
|
---|
[1770] | 982 | if ((source_stat->st_mode & S_IFMT) ==(dest_stat->st_mode & S_IFMT)) {
|
---|
[821] | 983 | /* Same type */
|
---|
[1770] | 984 | if (S_ISLNK(source_stat->st_mode)) {
|
---|
| 985 | if ((source_len = readlink(sourcepath, source_link, STRING_LENGTH - 1)) < 0
|
---|
| 986 | || (dest_len = readlink(destpath , dest_link , STRING_LENGTH - 1)) < 0
|
---|
| 987 | )
|
---|
| 988 | return FALSE;
|
---|
[821] | 989 | source_link[source_len] = '\0';
|
---|
| 990 | dest_link[dest_len] = '\0';
|
---|
[1770] | 991 | if ((source_len != dest_len) || (strcmp(source_link, dest_link) != 0)) {
|
---|
| 992 | unlink(destpath);
|
---|
| 993 | symlink(source_link, destpath);
|
---|
[821] | 994 | }
|
---|
[1770] | 995 | return TRUE;
|
---|
[821] | 996 | } /* Else not a symlink */
|
---|
[1770] | 997 | chmod(destpath, new_mode & ~S_IFMT);
|
---|
| 998 | chown(destpath, source_stat->st_uid, source_stat->st_gid);
|
---|
| 999 | return TRUE;
|
---|
[821] | 1000 | }
|
---|
| 1001 | /* Different types: unlink and create */
|
---|
[1770] | 1002 | unlink(destpath);
|
---|
| 1003 | switch (source_stat->st_mode & S_IFMT) {
|
---|
[821] | 1004 | case S_IFSOCK:
|
---|
[1770] | 1005 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
|
---|
[821] | 1006 | break;
|
---|
| 1007 | un_addr.sun_family = AF_UNIX;
|
---|
[1770] | 1008 | snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s", destpath);
|
---|
| 1009 | val = bind(fd,(struct sockaddr *) &un_addr,(int) sizeof un_addr);
|
---|
| 1010 | close(fd);
|
---|
| 1011 | if (val != 0 || chmod(destpath, new_mode & ~S_IFMT) != 0)
|
---|
[821] | 1012 | break;
|
---|
| 1013 | goto do_chown;
|
---|
| 1014 | case S_IFLNK:
|
---|
[1770] | 1015 | if ((val = readlink(sourcepath, symlink_val, STRING_LENGTH - 1)) < 0)
|
---|
[821] | 1016 | break;
|
---|
| 1017 | symlink_val[val] = '\0';
|
---|
[1770] | 1018 | if (symlink(symlink_val, destpath) == 0)
|
---|
| 1019 | return TRUE;
|
---|
[821] | 1020 | break;
|
---|
| 1021 | case S_IFREG:
|
---|
[1770] | 1022 | if ((fd = open(destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT)) < 0)
|
---|
[821] | 1023 | break;
|
---|
[1770] | 1024 | close(fd);
|
---|
| 1025 | if (chmod(destpath, new_mode & ~S_IFMT) != 0)
|
---|
[821] | 1026 | break;
|
---|
| 1027 | goto do_chown;
|
---|
| 1028 | case S_IFBLK:
|
---|
| 1029 | case S_IFCHR:
|
---|
| 1030 | case S_IFIFO:
|
---|
[1770] | 1031 | if (mknod(destpath, new_mode, source_stat->st_rdev) != 0)
|
---|
[821] | 1032 | break;
|
---|
| 1033 | goto do_chown;
|
---|
| 1034 | case S_IFDIR:
|
---|
[1770] | 1035 | if (mkdir(destpath, new_mode & ~S_IFMT) != 0)
|
---|
[821] | 1036 | break;
|
---|
| 1037 | do_chown:
|
---|
[1770] | 1038 | if (chown(destpath, source_stat->st_uid, source_stat->st_gid) == 0)
|
---|
| 1039 | return TRUE;
|
---|
[821] | 1040 | /*break;*/
|
---|
| 1041 | }
|
---|
[1770] | 1042 | return FALSE;
|
---|
[821] | 1043 | } /* End Function copy_inode */
|
---|
| 1044 |
|
---|
[1770] | 1045 | static void free_config(void)
|
---|
[821] | 1046 | /* [SUMMARY] Free the configuration information.
|
---|
| 1047 | [RETURNS] Nothing.
|
---|
| 1048 | */
|
---|
| 1049 | {
|
---|
| 1050 | struct config_entry_struct *c_entry;
|
---|
| 1051 | void *next;
|
---|
| 1052 |
|
---|
[1770] | 1053 | for (c_entry = first_config; c_entry != NULL; c_entry = next) {
|
---|
[821] | 1054 | unsigned int count;
|
---|
| 1055 |
|
---|
| 1056 | next = c_entry->next;
|
---|
[1770] | 1057 | regfree(&c_entry->preg);
|
---|
| 1058 | if (c_entry->action.what == AC_EXECUTE) {
|
---|
| 1059 | for (count = 0; count < MAX_ARGS; ++count) {
|
---|
[821] | 1060 | if (c_entry->u.execute.argv[count] == NULL)
|
---|
| 1061 | break;
|
---|
[1770] | 1062 | free(c_entry->u.execute.argv[count]);
|
---|
[821] | 1063 | }
|
---|
| 1064 | }
|
---|
[1770] | 1065 | free(c_entry);
|
---|
[821] | 1066 | }
|
---|
| 1067 | first_config = NULL;
|
---|
| 1068 | last_config = NULL;
|
---|
| 1069 | } /* End Function free_config */
|
---|
| 1070 |
|
---|
[1770] | 1071 | static int get_uid_gid(int flag, const char *string)
|
---|
[821] | 1072 | /* [SUMMARY] Convert a string to a UID or GID value.
|
---|
| 1073 | <flag> "UID" or "GID".
|
---|
| 1074 | <string> The string.
|
---|
| 1075 | [RETURNS] The UID or GID value.
|
---|
| 1076 | */
|
---|
| 1077 | {
|
---|
| 1078 | struct passwd *pw_ent;
|
---|
| 1079 | struct group *grp_ent;
|
---|
[1770] | 1080 | static const char *msg;
|
---|
[821] | 1081 |
|
---|
| 1082 | if (ENABLE_DEVFSD_VERBOSE)
|
---|
[1770] | 1083 | msg = "user";
|
---|
[821] | 1084 |
|
---|
[1770] | 1085 | if (isdigit(string[0]) ||((string[0] == '-') && isdigit(string[1])))
|
---|
| 1086 | return atoi(string);
|
---|
[821] | 1087 |
|
---|
[1770] | 1088 | if (flag == UID && (pw_ent = getpwnam(string)) != NULL)
|
---|
| 1089 | return pw_ent->pw_uid;
|
---|
[821] | 1090 |
|
---|
[1770] | 1091 | if (flag == GID && (grp_ent = getgrnam(string)) != NULL)
|
---|
| 1092 | return grp_ent->gr_gid;
|
---|
| 1093 | else if (ENABLE_DEVFSD_VERBOSE)
|
---|
| 1094 | msg = "group";
|
---|
[821] | 1095 |
|
---|
[1770] | 1096 | if (ENABLE_DEVFSD_VERBOSE)
|
---|
[821] | 1097 | msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]);
|
---|
[1770] | 1098 | return 0;
|
---|
[821] | 1099 | }/* End Function get_uid_gid */
|
---|
| 1100 |
|
---|
[1770] | 1101 | static mode_t get_mode(const char *string)
|
---|
[821] | 1102 | /* [SUMMARY] Convert a string to a mode value.
|
---|
| 1103 | <string> The string.
|
---|
| 1104 | [RETURNS] The mode value.
|
---|
| 1105 | */
|
---|
| 1106 | {
|
---|
| 1107 | mode_t mode;
|
---|
| 1108 | int i;
|
---|
| 1109 |
|
---|
[1770] | 1110 | if (isdigit(string[0]))
|
---|
| 1111 | return strtoul(string, NULL, 8);
|
---|
| 1112 | if (strlen(string) != 9)
|
---|
[821] | 1113 | msg_logger_and_die(LOG_ERR, "bad mode: %s", string);
|
---|
| 1114 |
|
---|
| 1115 | mode = 0;
|
---|
[1770] | 1116 | i = S_IRUSR;
|
---|
| 1117 | while (i > 0) {
|
---|
| 1118 | if (string[0] == 'r' || string[0] == 'w' || string[0] == 'x')
|
---|
| 1119 | mode += i;
|
---|
| 1120 | i = i / 2;
|
---|
[821] | 1121 | string++;
|
---|
| 1122 | }
|
---|
[1770] | 1123 | return mode;
|
---|
[821] | 1124 | } /* End Function get_mode */
|
---|
| 1125 |
|
---|
[1770] | 1126 | static void signal_handler(int sig)
|
---|
[821] | 1127 | {
|
---|
| 1128 | caught_signal = TRUE;
|
---|
| 1129 | if (sig == SIGHUP)
|
---|
| 1130 | caught_sighup = TRUE;
|
---|
| 1131 |
|
---|
[1770] | 1132 | info_logger(LOG_INFO, "Caught signal %d", sig);
|
---|
[821] | 1133 | } /* End Function signal_handler */
|
---|
| 1134 |
|
---|
[1770] | 1135 | static const char *get_variable(const char *variable, void *info)
|
---|
[821] | 1136 | {
|
---|
[1770] | 1137 | static char sbuf[sizeof(int)*3 + 2]; /* sign and NUL */
|
---|
| 1138 |
|
---|
| 1139 | char hostname[STRING_LENGTH];
|
---|
[821] | 1140 | struct get_variable_info *gv_info = info;
|
---|
[1770] | 1141 | const char *field_names[] = {
|
---|
| 1142 | "hostname", "mntpt", "devpath", "devname",
|
---|
| 1143 | "uid", "gid", "mode", hostname, mount_point,
|
---|
| 1144 | gv_info->devpath, gv_info->devname, NULL
|
---|
| 1145 | };
|
---|
[821] | 1146 | int i;
|
---|
| 1147 |
|
---|
[1770] | 1148 | if (gethostname(hostname, STRING_LENGTH - 1) != 0)
|
---|
[821] | 1149 | /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
|
---|
[1770] | 1150 | error_logger_and_die(LOG_ERR, "gethostname");
|
---|
[821] | 1151 |
|
---|
[1770] | 1152 | hostname[STRING_LENGTH - 1] = '\0';
|
---|
[821] | 1153 |
|
---|
[1770] | 1154 | /* index_in_str_array returns i>=0 */
|
---|
| 1155 | i = index_in_str_array(field_names, variable);
|
---|
[821] | 1156 |
|
---|
[1770] | 1157 | if (i > 6 || i < 0 || (i > 1 && gv_info == NULL))
|
---|
| 1158 | return NULL;
|
---|
| 1159 | if (i >= 0 && i <= 3)
|
---|
| 1160 | return field_names[i + 7];
|
---|
[821] | 1161 |
|
---|
[1770] | 1162 | if (i == 4)
|
---|
| 1163 | sprintf(sbuf, "%u", gv_info->info->uid);
|
---|
| 1164 | else if (i == 5)
|
---|
| 1165 | sprintf(sbuf, "%u", gv_info->info->gid);
|
---|
| 1166 | else if (i == 6)
|
---|
| 1167 | sprintf(sbuf, "%o", gv_info->info->mode);
|
---|
| 1168 | return sbuf;
|
---|
[821] | 1169 | } /* End Function get_variable */
|
---|
| 1170 |
|
---|
| 1171 | static void service(struct stat statbuf, char *path)
|
---|
| 1172 | {
|
---|
| 1173 | struct devfsd_notify_struct info;
|
---|
| 1174 |
|
---|
[1770] | 1175 | memset(&info, 0, sizeof info);
|
---|
[821] | 1176 | info.type = DEVFSD_NOTIFY_REGISTERED;
|
---|
| 1177 | info.mode = statbuf.st_mode;
|
---|
[1770] | 1178 | info.major = major(statbuf.st_rdev);
|
---|
| 1179 | info.minor = minor(statbuf.st_rdev);
|
---|
[821] | 1180 | info.uid = statbuf.st_uid;
|
---|
| 1181 | info.gid = statbuf.st_gid;
|
---|
[1770] | 1182 | snprintf(info.devname, sizeof(info.devname), "%s", path + strlen(mount_point) + 1);
|
---|
| 1183 | info.namelen = strlen(info.devname);
|
---|
| 1184 | service_name(&info);
|
---|
| 1185 | if (S_ISDIR(statbuf.st_mode))
|
---|
| 1186 | dir_operation(SERVICE, path, 0, NULL);
|
---|
[821] | 1187 | }
|
---|
| 1188 |
|
---|
| 1189 | static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
|
---|
| 1190 | /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
|
---|
| 1191 | <flag> To choose which function to perform
|
---|
| 1192 | <dp> The directory pointer. This is closed upon completion.
|
---|
| 1193 | <dir_name> The name of the directory.
|
---|
| 1194 | <rootlen> string length parameter.
|
---|
| 1195 | [RETURNS] Nothing.
|
---|
| 1196 | */
|
---|
| 1197 | {
|
---|
| 1198 | struct stat statbuf;
|
---|
| 1199 | DIR *dp;
|
---|
| 1200 | struct dirent *de;
|
---|
[1770] | 1201 | char *path;
|
---|
[821] | 1202 |
|
---|
[1770] | 1203 | if ((dp = warn_opendir(dir_name)) == NULL)
|
---|
[821] | 1204 | return;
|
---|
| 1205 |
|
---|
[1770] | 1206 | while ((de = readdir(dp)) != NULL) {
|
---|
[821] | 1207 |
|
---|
[1770] | 1208 | if (de->d_name && DOT_OR_DOTDOT(de->d_name))
|
---|
[821] | 1209 | continue;
|
---|
[1770] | 1210 | path = concat_path_file(dir_name, de->d_name);
|
---|
| 1211 | if (lstat(path, &statbuf) == 0) {
|
---|
| 1212 | switch (type) {
|
---|
| 1213 | case SERVICE:
|
---|
| 1214 | service(statbuf, path);
|
---|
| 1215 | break;
|
---|
| 1216 | case RESTORE:
|
---|
| 1217 | restore(path, statbuf, var);
|
---|
| 1218 | break;
|
---|
| 1219 | case READ_CONFIG:
|
---|
| 1220 | read_config_file(path, var, event_mask);
|
---|
| 1221 | break;
|
---|
| 1222 | }
|
---|
[821] | 1223 | }
|
---|
[1770] | 1224 | free(path);
|
---|
[821] | 1225 | }
|
---|
[1770] | 1226 | closedir(dp);
|
---|
[821] | 1227 | } /* End Function do_scan_and_service */
|
---|
| 1228 |
|
---|
[1770] | 1229 | static int mksymlink(const char *oldpath, const char *newpath)
|
---|
[821] | 1230 | /* [SUMMARY] Create a symlink, creating intervening directories as required.
|
---|
| 1231 | <oldpath> The string contained in the symlink.
|
---|
| 1232 | <newpath> The name of the new symlink.
|
---|
| 1233 | [RETURNS] 0 on success, else -1.
|
---|
| 1234 | */
|
---|
| 1235 | {
|
---|
[1770] | 1236 | if (!make_dir_tree(newpath))
|
---|
| 1237 | return -1;
|
---|
[821] | 1238 |
|
---|
[1770] | 1239 | if (symlink(oldpath, newpath) != 0) {
|
---|
[821] | 1240 | if (errno != EEXIST)
|
---|
[1770] | 1241 | return -1;
|
---|
[821] | 1242 | }
|
---|
[1770] | 1243 | return 0;
|
---|
[821] | 1244 | } /* End Function mksymlink */
|
---|
| 1245 |
|
---|
| 1246 |
|
---|
[1770] | 1247 | static int make_dir_tree(const char *path)
|
---|
[821] | 1248 | /* [SUMMARY] Creating intervening directories for a path as required.
|
---|
[1770] | 1249 | <path> The full pathname(including the leaf node).
|
---|
[821] | 1250 | [RETURNS] TRUE on success, else FALSE.
|
---|
| 1251 | */
|
---|
| 1252 | {
|
---|
[1770] | 1253 | if (bb_make_directory(dirname((char *)path), -1, FILEUTILS_RECUR) == -1)
|
---|
| 1254 | return FALSE;
|
---|
| 1255 | return TRUE;
|
---|
[821] | 1256 | } /* End Function make_dir_tree */
|
---|
| 1257 |
|
---|
| 1258 | static int expand_expression(char *output, unsigned int outsize,
|
---|
| 1259 | const char *input,
|
---|
| 1260 | const char *(*get_variable_func)(const char *variable, void *info),
|
---|
| 1261 | void *info,
|
---|
| 1262 | const char *devname,
|
---|
| 1263 | const regmatch_t *ex, unsigned int numexp)
|
---|
| 1264 | /* [SUMMARY] Expand environment variables and regular subexpressions in string.
|
---|
| 1265 | <output> The output expanded expression is written here.
|
---|
| 1266 | <length> The size of the output buffer.
|
---|
| 1267 | <input> The input expression. This may equal <<output>>.
|
---|
| 1268 | <get_variable> A function which will be used to get variable values. If
|
---|
| 1269 | this returns NULL, the environment is searched instead. If this is NULL,
|
---|
| 1270 | only the environment is searched.
|
---|
| 1271 | <info> An arbitrary pointer passed to <<get_variable>>.
|
---|
| 1272 | <devname> Device name; specifically, this is the string that contains all
|
---|
| 1273 | of the regular subexpressions.
|
---|
| 1274 | <ex> Array of start / end offsets into info->devname for each subexpression
|
---|
| 1275 | <numexp> Number of regular subexpressions found in <<devname>>.
|
---|
| 1276 | [RETURNS] TRUE on success, else FALSE.
|
---|
| 1277 | */
|
---|
| 1278 | {
|
---|
| 1279 | char temp[STRING_LENGTH];
|
---|
| 1280 |
|
---|
[1770] | 1281 | if (!st_expr_expand(temp, STRING_LENGTH, input, get_variable_func, info))
|
---|
| 1282 | return FALSE;
|
---|
| 1283 | expand_regexp(output, outsize, temp, devname, ex, numexp);
|
---|
| 1284 | return TRUE;
|
---|
[821] | 1285 | } /* End Function expand_expression */
|
---|
| 1286 |
|
---|
[1770] | 1287 | static void expand_regexp(char *output, size_t outsize, const char *input,
|
---|
[821] | 1288 | const char *devname,
|
---|
[1770] | 1289 | const regmatch_t *ex, unsigned int numex)
|
---|
[821] | 1290 | /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
|
---|
| 1291 | <output> The output expanded expression is written here.
|
---|
| 1292 | <outsize> The size of the output buffer.
|
---|
| 1293 | <input> The input expression. This may NOT equal <<output>>, because
|
---|
| 1294 | supporting that would require yet another string-copy. However, it's not
|
---|
| 1295 | hard to write a simple wrapper function to add this functionality for those
|
---|
| 1296 | few cases that need it.
|
---|
| 1297 | <devname> Device name; specifically, this is the string that contains all
|
---|
| 1298 | of the regular subexpressions.
|
---|
| 1299 | <ex> An array of start and end offsets into <<devname>>, one for each
|
---|
| 1300 | subexpression
|
---|
| 1301 | <numex> Number of subexpressions in the offset-array <<ex>>.
|
---|
| 1302 | [RETURNS] Nothing.
|
---|
| 1303 | */
|
---|
| 1304 | {
|
---|
| 1305 | const char last_exp = '0' - 1 + numex;
|
---|
| 1306 | int c = -1;
|
---|
| 1307 |
|
---|
| 1308 | /* Guarantee NULL termination by writing an explicit '\0' character into
|
---|
| 1309 | the very last byte */
|
---|
| 1310 | if (outsize)
|
---|
| 1311 | output[--outsize] = '\0';
|
---|
| 1312 | /* Copy the input string into the output buffer, replacing '\\' with '\'
|
---|
| 1313 | and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
|
---|
| 1314 | codes are deleted */
|
---|
[1770] | 1315 | while ((c != '\0') && (outsize != 0)) {
|
---|
[821] | 1316 | c = *input;
|
---|
| 1317 | ++input;
|
---|
[1770] | 1318 | if (c == '\\') {
|
---|
[821] | 1319 | c = *input;
|
---|
| 1320 | ++input;
|
---|
[1770] | 1321 | if (c != '\\') {
|
---|
| 1322 | if ((c >= '0') && (c <= last_exp)) {
|
---|
[821] | 1323 | const regmatch_t *subexp = ex + (c - '0');
|
---|
| 1324 | unsigned int sublen = subexp->rm_eo - subexp->rm_so;
|
---|
| 1325 |
|
---|
| 1326 | /* Range checking */
|
---|
| 1327 | if (sublen > outsize)
|
---|
| 1328 | sublen = outsize;
|
---|
[1770] | 1329 | strncpy(output, devname + subexp->rm_so, sublen);
|
---|
[821] | 1330 | output += sublen;
|
---|
| 1331 | outsize -= sublen;
|
---|
| 1332 | }
|
---|
| 1333 | continue;
|
---|
| 1334 | }
|
---|
| 1335 | }
|
---|
| 1336 | *output = c;
|
---|
| 1337 | ++output;
|
---|
| 1338 | --outsize;
|
---|
| 1339 | } /* while */
|
---|
| 1340 | } /* End Function expand_regexp */
|
---|
| 1341 |
|
---|
| 1342 |
|
---|
| 1343 | /* from compat_name.c */
|
---|
| 1344 |
|
---|
| 1345 | struct translate_struct
|
---|
| 1346 | {
|
---|
[1770] | 1347 | const char *match; /* The string to match to(up to length) */
|
---|
| 1348 | const char *format; /* Format of output, "%s" takes data past match string,
|
---|
| 1349 | NULL is effectively "%s"(just more efficient) */
|
---|
[821] | 1350 | };
|
---|
| 1351 |
|
---|
| 1352 | static struct translate_struct translate_table[] =
|
---|
| 1353 | {
|
---|
| 1354 | {"sound/", NULL},
|
---|
| 1355 | {"printers/", "lp%s"},
|
---|
| 1356 | {"v4l/", NULL},
|
---|
| 1357 | {"parports/", "parport%s"},
|
---|
| 1358 | {"fb/", "fb%s"},
|
---|
| 1359 | {"netlink/", NULL},
|
---|
| 1360 | {"loop/", "loop%s"},
|
---|
| 1361 | {"floppy/", "fd%s"},
|
---|
| 1362 | {"rd/", "ram%s"},
|
---|
| 1363 | {"md/", "md%s"}, /* Meta-devices */
|
---|
| 1364 | {"vc/", "tty%s"},
|
---|
| 1365 | {"misc/", NULL},
|
---|
| 1366 | {"isdn/", NULL},
|
---|
| 1367 | {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
|
---|
| 1368 | {"i2c/", "i2c-%s"},
|
---|
| 1369 | {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
|
---|
| 1370 | {"tts/E", "ttyE%s"}, /* Stallion serial driver */
|
---|
| 1371 | {"cua/E", "cue%s"}, /* Stallion serial driver callout */
|
---|
| 1372 | {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
|
---|
| 1373 | {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
|
---|
| 1374 | {"ip2/", "ip2%s"}, /* Computone serial driver control */
|
---|
| 1375 | {"tts/F", "ttyF%s"}, /* Computone serial driver */
|
---|
| 1376 | {"cua/F", "cuf%s"}, /* Computone serial driver callout */
|
---|
| 1377 | {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
|
---|
| 1378 | {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
|
---|
| 1379 | {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
|
---|
| 1380 | {"cua/", "cua%s"}, /* Generic serial: must be after others */
|
---|
| 1381 | {"input/js", "js%s"}, /* Joystick driver */
|
---|
| 1382 | {NULL, NULL}
|
---|
| 1383 | };
|
---|
| 1384 |
|
---|
[1770] | 1385 | const char *get_old_name(const char *devname, unsigned int namelen,
|
---|
[821] | 1386 | char *buffer, unsigned int major, unsigned int minor)
|
---|
| 1387 | /* [SUMMARY] Translate a kernel-supplied name into an old name.
|
---|
| 1388 | <devname> The device name provided by the kernel.
|
---|
| 1389 | <namelen> The length of the name.
|
---|
| 1390 | <buffer> A buffer that may be used. This should be at least 128 bytes long.
|
---|
| 1391 | <major> The major number for the device.
|
---|
| 1392 | <minor> The minor number for the device.
|
---|
| 1393 | [RETURNS] A pointer to the old name if known, else NULL.
|
---|
| 1394 | */
|
---|
| 1395 | {
|
---|
| 1396 | const char *compat_name = NULL;
|
---|
[1770] | 1397 | const char *ptr;
|
---|
[821] | 1398 | struct translate_struct *trans;
|
---|
| 1399 | unsigned int i;
|
---|
| 1400 | char mode;
|
---|
| 1401 | int indexx;
|
---|
| 1402 | const char *pty1;
|
---|
| 1403 | const char *pty2;
|
---|
| 1404 | size_t len;
|
---|
| 1405 | /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
|
---|
| 1406 | static const char *const fmt[] = {
|
---|
| 1407 | NULL ,
|
---|
| 1408 | "sg%u", /* scsi/generic */
|
---|
| 1409 | NULL, /* scsi/disc */
|
---|
| 1410 | "sr%u", /* scsi/cd */
|
---|
| 1411 | NULL, /* scsi/part */
|
---|
| 1412 | "nst%u%c", /* scsi/mt */
|
---|
| 1413 | "hd%c" , /* ide/host/disc */
|
---|
| 1414 | "hd%c" , /* ide/host/cd */
|
---|
| 1415 | "hd%c%s", /* ide/host/part */
|
---|
| 1416 | "%sht%d", /* ide/host/mt */
|
---|
| 1417 | "sbpcd%u", /* sbp/ */
|
---|
| 1418 | "vcs%s", /* vcc/ */
|
---|
| 1419 | "%cty%c%c", /* pty/ */
|
---|
| 1420 | NULL
|
---|
| 1421 | };
|
---|
| 1422 |
|
---|
[1770] | 1423 | for (trans = translate_table; trans->match != NULL; ++trans) {
|
---|
| 1424 | len = strlen(trans->match);
|
---|
[821] | 1425 |
|
---|
[1770] | 1426 | if (strncmp(devname, trans->match, len) == 0) {
|
---|
[821] | 1427 | if (trans->format == NULL)
|
---|
[1770] | 1428 | return devname + len;
|
---|
| 1429 | sprintf(buffer, trans->format, devname + len);
|
---|
| 1430 | return buffer;
|
---|
[821] | 1431 | }
|
---|
| 1432 | }
|
---|
| 1433 |
|
---|
[1770] | 1434 | ptr = bb_basename(devname);
|
---|
[821] | 1435 | i = scan_dev_name(devname, namelen, ptr);
|
---|
| 1436 |
|
---|
[1770] | 1437 | if (i > 0 && i < 13)
|
---|
[821] | 1438 | compat_name = buffer;
|
---|
| 1439 | else
|
---|
| 1440 | return NULL;
|
---|
| 1441 |
|
---|
| 1442 | /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
|
---|
[1770] | 1443 | if (i == 1 || i == 3 || i == 10)
|
---|
| 1444 | sprintf(buffer, fmt[i], minor);
|
---|
[821] | 1445 |
|
---|
| 1446 | /* 2 ==scsi/disc, 4 == scsi/part */
|
---|
[1770] | 1447 | if (i == 2 || i == 4)
|
---|
| 1448 | compat_name = write_old_sd_name(buffer, major, minor,((i == 2) ? "" : (ptr + 4)));
|
---|
[821] | 1449 |
|
---|
| 1450 | /* 5 == scsi/mt */
|
---|
[1770] | 1451 | if (i == 5) {
|
---|
[821] | 1452 | mode = ptr[2];
|
---|
| 1453 | if (mode == 'n')
|
---|
| 1454 | mode = '\0';
|
---|
[1770] | 1455 | sprintf(buffer, fmt[i], minor & 0x1f, mode);
|
---|
[821] | 1456 | if (devname[namelen - 1] != 'n')
|
---|
| 1457 | ++compat_name;
|
---|
| 1458 | }
|
---|
| 1459 | /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
|
---|
[1770] | 1460 | if (i == 6 || i == 7 || i == 8)
|
---|
[821] | 1461 | /* last arg should be ignored for i == 6 or i== 7 */
|
---|
[1770] | 1462 | sprintf(buffer, fmt[i] , get_old_ide_name(major, minor), ptr + 4);
|
---|
[821] | 1463 |
|
---|
| 1464 | /* 9 == ide/host/mt */
|
---|
[1770] | 1465 | if (i == 9)
|
---|
| 1466 | sprintf(buffer, fmt[i], ptr + 2, minor & 0x7f);
|
---|
[821] | 1467 |
|
---|
| 1468 | /* 11 == vcc/ */
|
---|
[1770] | 1469 | if (i == 11) {
|
---|
| 1470 | sprintf(buffer, fmt[i], devname + 4);
|
---|
[821] | 1471 | if (buffer[3] == '0')
|
---|
| 1472 | buffer[3] = '\0';
|
---|
| 1473 | }
|
---|
| 1474 | /* 12 == pty/ */
|
---|
[1770] | 1475 | if (i == 12) {
|
---|
[821] | 1476 | pty1 = "pqrstuvwxyzabcde";
|
---|
| 1477 | pty2 = "0123456789abcdef";
|
---|
[1770] | 1478 | indexx = atoi(devname + 5);
|
---|
| 1479 | sprintf(buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
|
---|
[821] | 1480 | }
|
---|
[1770] | 1481 | return compat_name;
|
---|
[821] | 1482 | } /* End Function get_old_name */
|
---|
| 1483 |
|
---|
[1770] | 1484 | static char get_old_ide_name(unsigned int major, unsigned int minor)
|
---|
[821] | 1485 | /* [SUMMARY] Get the old IDE name for a device.
|
---|
| 1486 | <major> The major number for the device.
|
---|
| 1487 | <minor> The minor number for the device.
|
---|
| 1488 | [RETURNS] The drive letter.
|
---|
| 1489 | */
|
---|
| 1490 | {
|
---|
[1770] | 1491 | char letter = 'y'; /* 121 */
|
---|
| 1492 | char c = 'a'; /* 97 */
|
---|
| 1493 | int i = IDE0_MAJOR;
|
---|
[821] | 1494 |
|
---|
| 1495 | /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
|
---|
| 1496 | do {
|
---|
[1770] | 1497 | if (i == IDE0_MAJOR || i == IDE1_MAJOR || i == IDE2_MAJOR
|
---|
| 1498 | || i == IDE3_MAJOR || i == IDE4_MAJOR || i == IDE5_MAJOR
|
---|
| 1499 | || i == IDE6_MAJOR || i == IDE7_MAJOR || i == IDE8_MAJOR
|
---|
| 1500 | || i == IDE9_MAJOR
|
---|
| 1501 | ) {
|
---|
| 1502 | if ((unsigned int)i == major) {
|
---|
| 1503 | letter = c;
|
---|
[821] | 1504 | break;
|
---|
| 1505 | }
|
---|
[1770] | 1506 | c += 2;
|
---|
[821] | 1507 | }
|
---|
| 1508 | i++;
|
---|
[1770] | 1509 | } while (i <= IDE9_MAJOR);
|
---|
[821] | 1510 |
|
---|
| 1511 | if (minor > 63)
|
---|
| 1512 | ++letter;
|
---|
[1770] | 1513 | return letter;
|
---|
[821] | 1514 | } /* End Function get_old_ide_name */
|
---|
| 1515 |
|
---|
[1770] | 1516 | static char *write_old_sd_name(char *buffer,
|
---|
[821] | 1517 | unsigned int major, unsigned int minor,
|
---|
[1770] | 1518 | const char *part)
|
---|
[821] | 1519 | /* [SUMMARY] Write the old SCSI disc name to a buffer.
|
---|
| 1520 | <buffer> The buffer to write to.
|
---|
| 1521 | <major> The major number for the device.
|
---|
| 1522 | <minor> The minor number for the device.
|
---|
| 1523 | <part> The partition string. Must be "" for a whole-disc entry.
|
---|
| 1524 | [RETURNS] A pointer to the buffer on success, else NULL.
|
---|
| 1525 | */
|
---|
| 1526 | {
|
---|
| 1527 | unsigned int disc_index;
|
---|
| 1528 |
|
---|
[1770] | 1529 | if (major == 8) {
|
---|
| 1530 | sprintf(buffer, "sd%c%s", 'a' + (minor >> 4), part);
|
---|
| 1531 | return buffer;
|
---|
[821] | 1532 | }
|
---|
[1770] | 1533 | if ((major > 64) && (major < 72)) {
|
---|
| 1534 | disc_index = ((major - 64) << 4) +(minor >> 4);
|
---|
[821] | 1535 | if (disc_index < 26)
|
---|
[1770] | 1536 | sprintf(buffer, "sd%c%s", 'a' + disc_index, part);
|
---|
[821] | 1537 | else
|
---|
[1770] | 1538 | sprintf(buffer, "sd%c%c%s", 'a' +(disc_index / 26) - 1, 'a' + disc_index % 26, part);
|
---|
| 1539 | return buffer;
|
---|
[821] | 1540 | }
|
---|
[1770] | 1541 | return NULL;
|
---|
[821] | 1542 | } /* End Function write_old_sd_name */
|
---|
| 1543 |
|
---|
| 1544 |
|
---|
| 1545 | /* expression.c */
|
---|
| 1546 |
|
---|
| 1547 | /*EXPERIMENTAL_FUNCTION*/
|
---|
| 1548 |
|
---|
[1770] | 1549 | int st_expr_expand(char *output, unsigned int length, const char *input,
|
---|
| 1550 | const char *(*get_variable_func)(const char *variable,
|
---|
[821] | 1551 | void *info),
|
---|
| 1552 | void *info)
|
---|
| 1553 | /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
|
---|
| 1554 | <output> The output expanded expression is written here.
|
---|
| 1555 | <length> The size of the output buffer.
|
---|
| 1556 | <input> The input expression. This may equal <<output>>.
|
---|
| 1557 | <get_variable> A function which will be used to get variable values. If
|
---|
| 1558 | this returns NULL, the environment is searched instead. If this is NULL,
|
---|
| 1559 | only the environment is searched.
|
---|
| 1560 | <info> An arbitrary pointer passed to <<get_variable>>.
|
---|
| 1561 | [RETURNS] TRUE on success, else FALSE.
|
---|
| 1562 | */
|
---|
| 1563 | {
|
---|
| 1564 | char ch;
|
---|
| 1565 | unsigned int len;
|
---|
| 1566 | unsigned int out_pos = 0;
|
---|
| 1567 | const char *env;
|
---|
| 1568 | const char *ptr;
|
---|
| 1569 | struct passwd *pwent;
|
---|
| 1570 | char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
|
---|
| 1571 |
|
---|
| 1572 | if (length > BUFFER_SIZE)
|
---|
| 1573 | length = BUFFER_SIZE;
|
---|
[1770] | 1574 | for (; TRUE; ++input) {
|
---|
| 1575 | switch (ch = *input) {
|
---|
[821] | 1576 | case '$':
|
---|
| 1577 | /* Variable expansion */
|
---|
[1770] | 1578 | input = expand_variable(buffer, length, &out_pos, ++input, get_variable_func, info);
|
---|
[821] | 1579 | if (input == NULL)
|
---|
[1770] | 1580 | return FALSE;
|
---|
[821] | 1581 | break;
|
---|
| 1582 | case '~':
|
---|
| 1583 | /* Home directory expansion */
|
---|
| 1584 | ch = input[1];
|
---|
[1770] | 1585 | if (isspace(ch) ||(ch == '/') ||(ch == '\0')) {
|
---|
[821] | 1586 | /* User's own home directory: leave separator for next time */
|
---|
[1770] | 1587 | if ((env = getenv("HOME")) == NULL) {
|
---|
| 1588 | info_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
|
---|
| 1589 | return FALSE;
|
---|
[821] | 1590 | }
|
---|
[1770] | 1591 | len = strlen(env);
|
---|
[821] | 1592 | if (len + out_pos >= length)
|
---|
| 1593 | goto st_expr_expand_out;
|
---|
[1770] | 1594 | memcpy(buffer + out_pos, env, len + 1);
|
---|
[821] | 1595 | out_pos += len;
|
---|
| 1596 | continue;
|
---|
| 1597 | }
|
---|
| 1598 | /* Someone else's home directory */
|
---|
[1770] | 1599 | for (ptr = ++input; !isspace(ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
|
---|
| 1600 | /* VOID */;
|
---|
[821] | 1601 | len = ptr - input;
|
---|
| 1602 | if (len >= sizeof tmp)
|
---|
| 1603 | goto st_expr_expand_out;
|
---|
[1770] | 1604 | safe_memcpy(tmp, input, len);
|
---|
[821] | 1605 | input = ptr - 1;
|
---|
[1770] | 1606 | if ((pwent = getpwnam(tmp)) == NULL) {
|
---|
| 1607 | info_logger(LOG_INFO, "no pwent for: %s", tmp);
|
---|
| 1608 | return FALSE;
|
---|
[821] | 1609 | }
|
---|
[1770] | 1610 | len = strlen(pwent->pw_dir);
|
---|
[821] | 1611 | if (len + out_pos >= length)
|
---|
| 1612 | goto st_expr_expand_out;
|
---|
[1770] | 1613 | memcpy(buffer + out_pos, pwent->pw_dir, len + 1);
|
---|
[821] | 1614 | out_pos += len;
|
---|
| 1615 | break;
|
---|
| 1616 | case '\0':
|
---|
| 1617 | /* Falltrough */
|
---|
| 1618 | default:
|
---|
| 1619 | if (out_pos >= length)
|
---|
| 1620 | goto st_expr_expand_out;
|
---|
| 1621 | buffer[out_pos++] = ch;
|
---|
[1770] | 1622 | if (ch == '\0') {
|
---|
| 1623 | memcpy(output, buffer, out_pos);
|
---|
| 1624 | return TRUE;
|
---|
[821] | 1625 | }
|
---|
| 1626 | break;
|
---|
| 1627 | /* esac */
|
---|
| 1628 | }
|
---|
| 1629 | }
|
---|
[1770] | 1630 | return FALSE;
|
---|
[821] | 1631 | st_expr_expand_out:
|
---|
[1770] | 1632 | info_logger(LOG_INFO, bb_msg_small_buffer);
|
---|
| 1633 | return FALSE;
|
---|
[821] | 1634 | } /* End Function st_expr_expand */
|
---|
| 1635 |
|
---|
| 1636 |
|
---|
| 1637 | /* Private functions follow */
|
---|
| 1638 |
|
---|
[1770] | 1639 | static const char *expand_variable(char *buffer, unsigned int length,
|
---|
[821] | 1640 | unsigned int *out_pos, const char *input,
|
---|
[1770] | 1641 | const char *(*func)(const char *variable,
|
---|
[821] | 1642 | void *info),
|
---|
| 1643 | void *info)
|
---|
| 1644 | /* [SUMMARY] Expand a variable.
|
---|
| 1645 | <buffer> The buffer to write to.
|
---|
| 1646 | <length> The length of the output buffer.
|
---|
| 1647 | <out_pos> The current output position. This is updated.
|
---|
| 1648 | <input> A pointer to the input character pointer.
|
---|
| 1649 | <func> A function which will be used to get variable values. If this
|
---|
| 1650 | returns NULL, the environment is searched instead. If this is NULL, only
|
---|
| 1651 | the environment is searched.
|
---|
| 1652 | <info> An arbitrary pointer passed to <<func>>.
|
---|
| 1653 | <errfp> Diagnostic messages are written here.
|
---|
| 1654 | [RETURNS] A pointer to the end of this subexpression on success, else NULL.
|
---|
| 1655 | */
|
---|
| 1656 | {
|
---|
| 1657 | char ch;
|
---|
| 1658 | int len;
|
---|
| 1659 | unsigned int open_braces;
|
---|
| 1660 | const char *env, *ptr;
|
---|
| 1661 | char tmp[STRING_LENGTH];
|
---|
| 1662 |
|
---|
| 1663 | ch = input[0];
|
---|
[1770] | 1664 | if (ch == '$') {
|
---|
[821] | 1665 | /* Special case for "$$": PID */
|
---|
[1770] | 1666 | sprintf(tmp, "%d",(int) getpid());
|
---|
| 1667 | len = strlen(tmp);
|
---|
[821] | 1668 | if (len + *out_pos >= length)
|
---|
| 1669 | goto expand_variable_out;
|
---|
| 1670 |
|
---|
[1770] | 1671 | memcpy(buffer + *out_pos, tmp, len + 1);
|
---|
[821] | 1672 | out_pos += len;
|
---|
[1770] | 1673 | return input;
|
---|
[821] | 1674 | }
|
---|
| 1675 | /* Ordinary variable expansion, possibly in braces */
|
---|
[1770] | 1676 | if (ch != '{') {
|
---|
[821] | 1677 | /* Simple variable expansion */
|
---|
[1770] | 1678 | for (ptr = input; isalnum(ch) || (ch == '_') || (ch == ':'); ch = *++ptr)
|
---|
| 1679 | /* VOID */;
|
---|
[821] | 1680 | len = ptr - input;
|
---|
| 1681 | if ((size_t)len >= sizeof tmp)
|
---|
| 1682 | goto expand_variable_out;
|
---|
| 1683 |
|
---|
[1770] | 1684 | safe_memcpy(tmp, input, len);
|
---|
[821] | 1685 | input = ptr - 1;
|
---|
[1770] | 1686 | if ((env = get_variable_v2(tmp, func, info)) == NULL) {
|
---|
| 1687 | info_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
|
---|
| 1688 | return NULL;
|
---|
[821] | 1689 | }
|
---|
[1770] | 1690 | len = strlen(env);
|
---|
[821] | 1691 | if (len + *out_pos >= length)
|
---|
| 1692 | goto expand_variable_out;
|
---|
| 1693 |
|
---|
[1770] | 1694 | memcpy(buffer + *out_pos, env, len + 1);
|
---|
[821] | 1695 | *out_pos += len;
|
---|
[1770] | 1696 | return input;
|
---|
[821] | 1697 | }
|
---|
| 1698 | /* Variable in braces: check for ':' tricks */
|
---|
| 1699 | ch = *++input;
|
---|
[1770] | 1700 | for (ptr = input; isalnum(ch) || (ch == '_'); ch = *++ptr)
|
---|
[821] | 1701 | /* VOID */;
|
---|
[1770] | 1702 | if (ch == '}') {
|
---|
[821] | 1703 | /* Must be simple variable expansion with "${var}" */
|
---|
| 1704 | len = ptr - input;
|
---|
| 1705 | if ((size_t)len >= sizeof tmp)
|
---|
| 1706 | goto expand_variable_out;
|
---|
| 1707 |
|
---|
[1770] | 1708 | safe_memcpy(tmp, input, len);
|
---|
| 1709 | ptr = expand_variable(buffer, length, out_pos, tmp, func, info);
|
---|
[821] | 1710 | if (ptr == NULL)
|
---|
[1770] | 1711 | return NULL;
|
---|
| 1712 | return input + len;
|
---|
[821] | 1713 | }
|
---|
[1770] | 1714 | if (ch != ':' || ptr[1] != '-') {
|
---|
| 1715 | info_logger(LOG_INFO, "illegal char in var name");
|
---|
| 1716 | return NULL;
|
---|
[821] | 1717 | }
|
---|
| 1718 | /* It's that handy "${var:-word}" expression. Check if var is defined */
|
---|
| 1719 | len = ptr - input;
|
---|
| 1720 | if ((size_t)len >= sizeof tmp)
|
---|
| 1721 | goto expand_variable_out;
|
---|
| 1722 |
|
---|
[1770] | 1723 | safe_memcpy(tmp, input, len);
|
---|
[821] | 1724 | /* Move input pointer to ':' */
|
---|
| 1725 | input = ptr;
|
---|
| 1726 | /* First skip to closing brace, taking note of nested expressions */
|
---|
| 1727 | ptr += 2;
|
---|
| 1728 | ch = ptr[0];
|
---|
[1770] | 1729 | for (open_braces = 1; open_braces > 0; ch = *++ptr) {
|
---|
| 1730 | switch (ch) {
|
---|
[821] | 1731 | case '{':
|
---|
| 1732 | ++open_braces;
|
---|
| 1733 | break;
|
---|
| 1734 | case '}':
|
---|
| 1735 | --open_braces;
|
---|
| 1736 | break;
|
---|
| 1737 | case '\0':
|
---|
[1770] | 1738 | info_logger(LOG_INFO,"\"}\" not found in: %s", input);
|
---|
| 1739 | return NULL;
|
---|
[821] | 1740 | default:
|
---|
| 1741 | break;
|
---|
| 1742 | }
|
---|
| 1743 | }
|
---|
| 1744 | --ptr;
|
---|
| 1745 | /* At this point ptr should point to closing brace of "${var:-word}" */
|
---|
[1770] | 1746 | if ((env = get_variable_v2(tmp, func, info)) != NULL) {
|
---|
[821] | 1747 | /* Found environment variable, so skip the input to the closing brace
|
---|
| 1748 | and return the variable */
|
---|
| 1749 | input = ptr;
|
---|
[1770] | 1750 | len = strlen(env);
|
---|
[821] | 1751 | if (len + *out_pos >= length)
|
---|
| 1752 | goto expand_variable_out;
|
---|
| 1753 |
|
---|
[1770] | 1754 | memcpy(buffer + *out_pos, env, len + 1);
|
---|
[821] | 1755 | *out_pos += len;
|
---|
[1770] | 1756 | return input;
|
---|
[821] | 1757 | }
|
---|
| 1758 | /* Environment variable was not found, so process word. Advance input
|
---|
| 1759 | pointer to start of word in "${var:-word}" */
|
---|
| 1760 | input += 2;
|
---|
| 1761 | len = ptr - input;
|
---|
| 1762 | if ((size_t)len >= sizeof tmp)
|
---|
| 1763 | goto expand_variable_out;
|
---|
| 1764 |
|
---|
[1770] | 1765 | safe_memcpy(tmp, input, len);
|
---|
[821] | 1766 | input = ptr;
|
---|
[1770] | 1767 | if (!st_expr_expand(tmp, STRING_LENGTH, tmp, func, info))
|
---|
| 1768 | return NULL;
|
---|
| 1769 | len = strlen(tmp);
|
---|
[821] | 1770 | if (len + *out_pos >= length)
|
---|
| 1771 | goto expand_variable_out;
|
---|
| 1772 |
|
---|
[1770] | 1773 | memcpy(buffer + *out_pos, tmp, len + 1);
|
---|
[821] | 1774 | *out_pos += len;
|
---|
[1770] | 1775 | return input;
|
---|
[821] | 1776 | expand_variable_out:
|
---|
[1770] | 1777 | info_logger(LOG_INFO, bb_msg_small_buffer);
|
---|
| 1778 | return NULL;
|
---|
[821] | 1779 | } /* End Function expand_variable */
|
---|
| 1780 |
|
---|
| 1781 |
|
---|
[1770] | 1782 | static const char *get_variable_v2(const char *variable,
|
---|
| 1783 | const char *(*func)(const char *variable, void *info),
|
---|
[821] | 1784 | void *info)
|
---|
| 1785 | /* [SUMMARY] Get a variable from the environment or .
|
---|
| 1786 | <variable> The variable name.
|
---|
| 1787 | <func> A function which will be used to get the variable. If this returns
|
---|
| 1788 | NULL, the environment is searched instead. If this is NULL, only the
|
---|
| 1789 | environment is searched.
|
---|
| 1790 | [RETURNS] The value of the variable on success, else NULL.
|
---|
| 1791 | */
|
---|
| 1792 | {
|
---|
| 1793 | const char *value;
|
---|
| 1794 |
|
---|
[1770] | 1795 | if (func != NULL) {
|
---|
| 1796 | value = (*func)(variable, info);
|
---|
[821] | 1797 | if (value != NULL)
|
---|
[1770] | 1798 | return value;
|
---|
[821] | 1799 | }
|
---|
[1770] | 1800 | return getenv(variable);
|
---|
[821] | 1801 | } /* End Function get_variable */
|
---|
| 1802 |
|
---|
| 1803 | /* END OF CODE */
|
---|