[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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[2725] | 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[1765] | 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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[3232] | 56 |
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| 57 | //usage:#define devfsd_trivial_usage
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| 58 | //usage: "mntpnt [-v]" IF_DEVFSD_FG_NP("[-fg][-np]")
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| 59 | //usage:#define devfsd_full_usage "\n\n"
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| 60 | //usage: "Manage devfs permissions and old device name symlinks\n"
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| 61 | //usage: "\n mntpnt The mount point where devfs is mounted"
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| 62 | //usage: "\n -v Print the protocol version numbers for devfsd"
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| 63 | //usage: "\n and the kernel-side protocol version and exit"
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| 64 | //usage: IF_DEVFSD_FG_NP(
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| 65 | //usage: "\n -fg Run in foreground"
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| 66 | //usage: "\n -np Exit after parsing the configuration file"
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| 67 | //usage: "\n and processing synthetic REGISTER events,"
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| 68 | //usage: "\n don't poll for events"
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| 69 | //usage: )
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| 70 |
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[2725] | 71 | #include "libbb.h"
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| 72 | #include "xregex.h"
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| 73 | #include <syslog.h>
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[821] | 74 |
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| 75 | #include <sys/un.h>
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| 76 | #include <sys/sysmacros.h>
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| 77 |
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| 78 | /* Various defines taken from linux/major.h */
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| 79 | #define IDE0_MAJOR 3
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| 80 | #define IDE1_MAJOR 22
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| 81 | #define IDE2_MAJOR 33
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| 82 | #define IDE3_MAJOR 34
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| 83 | #define IDE4_MAJOR 56
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| 84 | #define IDE5_MAJOR 57
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| 85 | #define IDE6_MAJOR 88
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| 86 | #define IDE7_MAJOR 89
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| 87 | #define IDE8_MAJOR 90
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| 88 | #define IDE9_MAJOR 91
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| 89 |
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| 90 |
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| 91 | /* Various defines taken from linux/devfs_fs.h */
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| 92 | #define DEVFSD_PROTOCOL_REVISION_KERNEL 5
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[2725] | 93 | #define DEVFSD_IOCTL_BASE 'd'
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[821] | 94 | /* These are the various ioctls */
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| 95 | #define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int)
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| 96 | #define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int)
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| 97 | #define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int)
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| 98 | #define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int)
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| 99 | #define DEVFSD_NOTIFY_REGISTERED 0
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| 100 | #define DEVFSD_NOTIFY_UNREGISTERED 1
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| 101 | #define DEVFSD_NOTIFY_ASYNC_OPEN 2
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| 102 | #define DEVFSD_NOTIFY_CLOSE 3
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| 103 | #define DEVFSD_NOTIFY_LOOKUP 4
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| 104 | #define DEVFSD_NOTIFY_CHANGE 5
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| 105 | #define DEVFSD_NOTIFY_CREATE 6
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| 106 | #define DEVFSD_NOTIFY_DELETE 7
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| 107 | #define DEVFS_PATHLEN 1024
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| 108 | /* Never change this otherwise the binary interface will change */
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| 109 |
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[2725] | 110 | struct devfsd_notify_struct {
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| 111 | /* Use native C types to ensure same types in kernel and user space */
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| 112 | unsigned int type; /* DEVFSD_NOTIFY_* value */
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| 113 | unsigned int mode; /* Mode of the inode or device entry */
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| 114 | unsigned int major; /* Major number of device entry */
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| 115 | unsigned int minor; /* Minor number of device entry */
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| 116 | unsigned int uid; /* Uid of process, inode or device entry */
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| 117 | unsigned int gid; /* Gid of process, inode or device entry */
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| 118 | unsigned int overrun_count; /* Number of lost events */
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| 119 | unsigned int namelen; /* Number of characters not including '\0' */
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| 120 | /* The device name MUST come last */
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| 121 | char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */
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[821] | 122 | };
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| 123 |
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| 124 | #define BUFFER_SIZE 16384
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| 125 | #define DEVFSD_VERSION "1.3.25"
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| 126 | #define CONFIG_FILE "/etc/devfsd.conf"
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| 127 | #define MODPROBE "/sbin/modprobe"
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| 128 | #define MODPROBE_SWITCH_1 "-k"
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| 129 | #define MODPROBE_SWITCH_2 "-C"
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| 130 | #define CONFIG_MODULES_DEVFS "/etc/modules.devfs"
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| 131 | #define MAX_ARGS (6 + 1)
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| 132 | #define MAX_SUBEXPR 10
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| 133 | #define STRING_LENGTH 255
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| 134 |
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| 135 | /* for get_uid_gid() */
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| 136 | #define UID 0
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| 137 | #define GID 1
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| 138 |
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| 139 | /* fork_and_execute() */
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| 140 | # define DIE 1
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| 141 | # define NO_DIE 0
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| 142 |
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| 143 | /* for dir_operation() */
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| 144 | #define RESTORE 0
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| 145 | #define SERVICE 1
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| 146 | #define READ_CONFIG 2
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| 147 |
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| 148 | /* Update only after changing code to reflect new protocol */
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| 149 | #define DEVFSD_PROTOCOL_REVISION_DAEMON 5
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| 150 |
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| 151 | /* Compile-time check */
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| 152 | #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
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| 153 | #error protocol version mismatch. Update your kernel headers
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| 154 | #endif
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| 155 |
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| 156 | #define AC_PERMISSIONS 0
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| 157 | #define AC_MODLOAD 1
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| 158 | #define AC_EXECUTE 2
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| 159 | #define AC_MFUNCTION 3 /* not supported by busybox */
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| 160 | #define AC_CFUNCTION 4 /* not supported by busybox */
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| 161 | #define AC_COPY 5
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| 162 | #define AC_IGNORE 6
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| 163 | #define AC_MKOLDCOMPAT 7
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| 164 | #define AC_MKNEWCOMPAT 8
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| 165 | #define AC_RMOLDCOMPAT 9
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| 166 | #define AC_RMNEWCOMPAT 10
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| 167 | #define AC_RESTORE 11
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| 168 |
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[2725] | 169 | struct permissions_type {
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[1765] | 170 | mode_t mode;
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| 171 | uid_t uid;
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| 172 | gid_t gid;
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[821] | 173 | };
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| 174 |
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[2725] | 175 | struct execute_type {
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[1765] | 176 | char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
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[821] | 177 | };
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| 178 |
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[2725] | 179 | struct copy_type {
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[1765] | 180 | const char *source;
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| 181 | const char *destination;
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[821] | 182 | };
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| 183 |
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[2725] | 184 | struct action_type {
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[1765] | 185 | unsigned int what;
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| 186 | unsigned int when;
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[821] | 187 | };
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| 188 |
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[2725] | 189 | struct config_entry_struct {
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[1765] | 190 | struct action_type action;
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| 191 | regex_t preg;
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| 192 | union
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| 193 | {
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[821] | 194 | struct permissions_type permissions;
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| 195 | struct execute_type execute;
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| 196 | struct copy_type copy;
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[1765] | 197 | }
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| 198 | u;
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| 199 | struct config_entry_struct *next;
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[821] | 200 | };
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| 201 |
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[2725] | 202 | struct get_variable_info {
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[1765] | 203 | const struct devfsd_notify_struct *info;
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| 204 | const char *devname;
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| 205 | char devpath[STRING_LENGTH];
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[821] | 206 | };
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| 207 |
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[1765] | 208 | static void dir_operation(int , const char * , int, unsigned long*);
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[821] | 209 | static void service(struct stat statbuf, char *path);
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[1765] | 210 | static int st_expr_expand(char *, unsigned, const char *, const char *(*)(const char *, void *), void *);
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[821] | 211 | static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
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[1765] | 212 | static int mksymlink(const char *oldpath, const char *newpath);
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| 213 | static void read_config_file(char *path, int optional, unsigned long *event_mask);
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| 214 | static void process_config_line(const char *, unsigned long *);
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| 215 | static int do_servicing(int, unsigned long);
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| 216 | static void service_name(const struct devfsd_notify_struct *);
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| 217 | static void action_permissions(const struct devfsd_notify_struct *, const struct config_entry_struct *);
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| 218 | static void action_execute(const struct devfsd_notify_struct *, const struct config_entry_struct *,
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[821] | 219 | const regmatch_t *, unsigned);
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[1765] | 220 | static void action_modload(const struct devfsd_notify_struct *info, const struct config_entry_struct *entry);
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| 221 | static void action_copy(const struct devfsd_notify_struct *, const struct config_entry_struct *,
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[3232] | 222 | const regmatch_t *, unsigned);
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[1765] | 223 | static void action_compat(const struct devfsd_notify_struct *, unsigned);
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| 224 | static void free_config(void);
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[821] | 225 | static void restore(char *spath, struct stat source_stat, int rootlen);
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[1765] | 226 | static int copy_inode(const char *, const struct stat *, mode_t, const char *, const struct stat *);
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| 227 | static mode_t get_mode(const char *);
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| 228 | static void signal_handler(int);
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| 229 | static const char *get_variable(const char *, void *);
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| 230 | static int make_dir_tree(const char *);
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[821] | 231 | static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
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[3232] | 232 | const char *, const regmatch_t *, unsigned);
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[1765] | 233 | static void expand_regexp(char *, size_t, const char *, const char *, const regmatch_t *, unsigned);
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[821] | 234 | static const char *expand_variable( char *, unsigned, unsigned *, const char *,
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[1765] | 235 | const char *(*)(const char *, void *), void *);
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| 236 | static const char *get_variable_v2(const char *, const char *(*)(const char *, void *), void *);
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[3232] | 237 | static char get_old_ide_name(unsigned, unsigned);
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[1765] | 238 | static char *write_old_sd_name(char *, unsigned, unsigned, const char *);
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[821] | 239 |
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| 240 | /* busybox functions */
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[1765] | 241 | static int get_uid_gid(int flag, const char *string);
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| 242 | static void safe_memcpy(char * dest, const char * src, int len);
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| 243 | static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr);
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| 244 | static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr);
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[821] | 245 |
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| 246 | /* Structs and vars */
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| 247 | static struct config_entry_struct *first_config = NULL;
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| 248 | static struct config_entry_struct *last_config = NULL;
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[1765] | 249 | static char *mount_point = NULL;
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[821] | 250 | static volatile int caught_signal = FALSE;
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| 251 | static volatile int caught_sighup = FALSE;
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[1765] | 252 | static struct initial_symlink_struct {
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| 253 | const char *dest;
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| 254 | const char *name;
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| 255 | } initial_symlinks[] = {
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| 256 | {"/proc/self/fd", "fd"},
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| 257 | {"fd/0", "stdin"},
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| 258 | {"fd/1", "stdout"},
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| 259 | {"fd/2", "stderr"},
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| 260 | {NULL, NULL},
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[821] | 261 | };
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| 262 |
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[1765] | 263 | static struct event_type {
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| 264 | unsigned int type; /* The DEVFSD_NOTIFY_* value */
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| 265 | const char *config_name; /* The name used in the config file */
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| 266 | } event_types[] = {
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| 267 | {DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
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| 268 | {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
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| 269 | {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
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| 270 | {DEVFSD_NOTIFY_CLOSE, "CLOSE"},
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| 271 | {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
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| 272 | {DEVFSD_NOTIFY_CHANGE, "CHANGE"},
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| 273 | {DEVFSD_NOTIFY_CREATE, "CREATE"},
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| 274 | {DEVFSD_NOTIFY_DELETE, "DELETE"},
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| 275 | {0xffffffff, NULL}
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[821] | 276 | };
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| 277 |
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| 278 | /* Busybox messages */
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| 279 |
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[1765] | 280 | static const char bb_msg_proto_rev[] ALIGN1 = "protocol revision";
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| 281 | static const char bb_msg_bad_config[] ALIGN1 = "bad %s config file: %s";
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| 282 | static const char bb_msg_small_buffer[] ALIGN1 = "buffer too small";
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| 283 | static const char bb_msg_variable_not_found[] ALIGN1 = "variable: %s not found";
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[821] | 284 |
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| 285 | /* Busybox stuff */
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[1765] | 286 | #if ENABLE_DEVFSD_VERBOSE || ENABLE_DEBUG
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| 287 | #define info_logger(p, fmt, args...) bb_info_msg(fmt, ## args)
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| 288 | #define msg_logger(p, fmt, args...) bb_error_msg(fmt, ## args)
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| 289 | #define msg_logger_and_die(p, fmt, args...) bb_error_msg_and_die(fmt, ## args)
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| 290 | #define error_logger(p, fmt, args...) bb_perror_msg(fmt, ## args)
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| 291 | #define error_logger_and_die(p, fmt, args...) bb_perror_msg_and_die(fmt, ## args)
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[821] | 292 | #else
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[1765] | 293 | #define info_logger(p, fmt, args...)
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[821] | 294 | #define msg_logger(p, fmt, args...)
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[2725] | 295 | #define msg_logger_and_die(p, fmt, args...) exit(EXIT_FAILURE)
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[1765] | 296 | #define error_logger(p, fmt, args...)
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[2725] | 297 | #define error_logger_and_die(p, fmt, args...) exit(EXIT_FAILURE)
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[821] | 298 | #endif
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| 299 |
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[1765] | 300 | static void safe_memcpy(char *dest, const char *src, int len)
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[821] | 301 | {
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[1765] | 302 | memcpy(dest , src, len);
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[821] | 303 | dest[len] = '\0';
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| 304 | }
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| 305 |
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[1765] | 306 | static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, const char *ptr)
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[821] | 307 | {
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[1765] | 308 | if (d[n - 4] == 'd' && d[n - 3] == 'i' && d[n - 2] == 's' && d[n - 1] == 'c')
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| 309 | return 2 + addendum;
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| 310 | if (d[n - 2] == 'c' && d[n - 1] == 'd')
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| 311 | return 3 + addendum;
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| 312 | if (ptr[0] == 'p' && ptr[1] == 'a' && ptr[2] == 'r' && ptr[3] == 't')
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| 313 | return 4 + addendum;
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| 314 | if (ptr[n - 2] == 'm' && ptr[n - 1] == 't')
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| 315 | return 5 + addendum;
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| 316 | return 0;
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[821] | 317 | }
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| 318 |
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[1765] | 319 | static unsigned int scan_dev_name(const char *d, unsigned int n, const char *ptr)
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[821] | 320 | {
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[1765] | 321 | if (d[0] == 's' && d[1] == 'c' && d[2] == 's' && d[3] == 'i' && d[4] == '/') {
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| 322 | if (d[n - 7] == 'g' && d[n - 6] == 'e' && d[n - 5] == 'n'
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| 323 | && d[n - 4] == 'e' && d[n - 3] == 'r' && d[n - 2] == 'i' && d[n - 1] == 'c'
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| 324 | )
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[821] | 325 | return 1;
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| 326 | return scan_dev_name_common(d, n, 0, ptr);
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| 327 | }
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[1765] | 328 | if (d[0] == 'i' && d[1] == 'd' && d[2] == 'e' && d[3] == '/'
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| 329 | && d[4] == 'h' && d[5] == 'o' && d[6] == 's' && d[7] == 't'
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| 330 | )
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[821] | 331 | return scan_dev_name_common(d, n, 4, ptr);
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[1765] | 332 | if (d[0] == 's' && d[1] == 'b' && d[2] == 'p' && d[3] == '/')
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[821] | 333 | return 10;
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[1765] | 334 | if (d[0] == 'v' && d[1] == 'c' && d[2] == 'c' && d[3] == '/')
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[821] | 335 | return 11;
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[1765] | 336 | if (d[0] == 'p' && d[1] == 't' && d[2] == 'y' && d[3] == '/')
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[821] | 337 | return 12;
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| 338 | return 0;
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| 339 | }
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| 340 |
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| 341 | /* Public functions follow */
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| 342 |
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[2725] | 343 | int devfsd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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[1765] | 344 | int devfsd_main(int argc, char **argv)
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[821] | 345 | {
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| 346 | int print_version = FALSE;
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| 347 | int do_daemon = TRUE;
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| 348 | int no_polling = FALSE;
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| 349 | int do_scan;
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| 350 | int fd, proto_rev, count;
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| 351 | unsigned long event_mask = 0;
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| 352 | struct sigaction new_action;
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| 353 | struct initial_symlink_struct *curr;
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| 354 |
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| 355 | if (argc < 2)
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| 356 | bb_show_usage();
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| 357 |
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[1765] | 358 | for (count = 2; count < argc; ++count) {
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| 359 | if (argv[count][0] == '-') {
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| 360 | if (argv[count][1] == 'v' && !argv[count][2]) /* -v */
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| 361 | print_version = TRUE;
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| 362 | else if (ENABLE_DEVFSD_FG_NP && argv[count][1] == 'f'
|
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| 363 | && argv[count][2] == 'g' && !argv[count][3]) /* -fg */
|
---|
| 364 | do_daemon = FALSE;
|
---|
| 365 | else if (ENABLE_DEVFSD_FG_NP && argv[count][1] == 'n'
|
---|
| 366 | && argv[count][2] == 'p' && !argv[count][3]) /* -np */
|
---|
| 367 | no_polling = TRUE;
|
---|
[821] | 368 | else
|
---|
| 369 | bb_show_usage();
|
---|
| 370 | }
|
---|
| 371 | }
|
---|
| 372 |
|
---|
[1765] | 373 | mount_point = bb_simplify_path(argv[1]);
|
---|
[821] | 374 |
|
---|
[1765] | 375 | xchdir(mount_point);
|
---|
[821] | 376 |
|
---|
[1765] | 377 | fd = xopen(".devfsd", O_RDONLY);
|
---|
[2725] | 378 | close_on_exec_on(fd);
|
---|
[1765] | 379 | xioctl(fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev);
|
---|
[821] | 380 |
|
---|
| 381 | /*setup initial entries */
|
---|
[1765] | 382 | for (curr = initial_symlinks; curr->dest != NULL; ++curr)
|
---|
| 383 | symlink(curr->dest, curr->name);
|
---|
[821] | 384 |
|
---|
| 385 | /* NB: The check for CONFIG_FILE is done in read_config_file() */
|
---|
| 386 |
|
---|
[1765] | 387 | if (print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)) {
|
---|
| 388 | printf("%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
|
---|
| 389 | applet_name, DEVFSD_VERSION, bb_msg_proto_rev,
|
---|
| 390 | DEVFSD_PROTOCOL_REVISION_DAEMON, bb_msg_proto_rev, proto_rev);
|
---|
[821] | 391 | if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
|
---|
[1765] | 392 | bb_error_msg_and_die("%s mismatch!", bb_msg_proto_rev);
|
---|
[821] | 393 | exit(EXIT_SUCCESS); /* -v */
|
---|
| 394 | }
|
---|
[1765] | 395 | /* Tell kernel we are special(i.e. we get to see hidden entries) */
|
---|
| 396 | xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, 0);
|
---|
[821] | 397 |
|
---|
[2725] | 398 | /* Set up SIGHUP and SIGUSR1 handlers */
|
---|
[1765] | 399 | sigemptyset(&new_action.sa_mask);
|
---|
[821] | 400 | new_action.sa_flags = 0;
|
---|
| 401 | new_action.sa_handler = signal_handler;
|
---|
[2725] | 402 | sigaction_set(SIGHUP, &new_action);
|
---|
| 403 | sigaction_set(SIGUSR1, &new_action);
|
---|
[821] | 404 |
|
---|
[2725] | 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 */
|
---|
[1765] | 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 */
|
---|
[1765] | 411 | dir_operation(SERVICE, mount_point, 0, NULL);
|
---|
[821] | 412 |
|
---|
| 413 | if (ENABLE_DEVFSD_FG_NP && no_polling)
|
---|
[2725] | 414 | exit(EXIT_SUCCESS);
|
---|
[1765] | 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 */
|
---|
[1765] | 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 |
|
---|
[1765] | 432 | while (TRUE) {
|
---|
| 433 | do_scan = do_servicing(fd, event_mask);
|
---|
[821] | 434 |
|
---|
[1765] | 435 | free_config();
|
---|
| 436 | read_config_file((char*)CONFIG_FILE, FALSE, &event_mask);
|
---|
[821] | 437 | if (do_scan)
|
---|
[1765] | 438 | dir_operation(SERVICE, mount_point, 0, NULL);
|
---|
[821] | 439 | }
|
---|
[1765] | 440 | if (ENABLE_FEATURE_CLEAN_UP) free(mount_point);
|
---|
[821] | 441 | } /* End Function main */
|
---|
| 442 |
|
---|
| 443 |
|
---|
| 444 | /* Private functions follow */
|
---|
| 445 |
|
---|
[1765] | 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
|
---|
[1765] | 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];
|
---|
[1765] | 458 | char *line = NULL;
|
---|
| 459 | char *p;
|
---|
[821] | 460 |
|
---|
[1765] | 461 | if (stat(path, &statbuf) == 0) {
|
---|
[821] | 462 | /* Don't read 0 length files: ignored */
|
---|
[1765] | 463 | /*if (statbuf.st_size == 0)
|
---|
[821] | 464 | return;*/
|
---|
[1765] | 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 | }
|
---|
[2725] | 471 | fp = fopen_for_read(path);
|
---|
| 472 | if (fp != NULL) {
|
---|
[1765] | 473 | while (fgets(buf, STRING_LENGTH, fp) != NULL) {
|
---|
[821] | 474 | /* Skip whitespace */
|
---|
[1765] | 475 | line = buf;
|
---|
| 476 | line = skip_whitespace(line);
|
---|
| 477 | if (line[0] == '\0' || line[0] == '#')
|
---|
[821] | 478 | continue;
|
---|
[1765] | 479 | process_config_line(line, event_mask);
|
---|
[821] | 480 | }
|
---|
[1765] | 481 | fclose(fp);
|
---|
[821] | 482 | } else {
|
---|
| 483 | goto read_config_file_err;
|
---|
| 484 | }
|
---|
| 485 | } else {
|
---|
| 486 | read_config_file_err:
|
---|
[1765] | 487 | if (optional == 0 && errno == ENOENT)
|
---|
| 488 | error_logger_and_die(LOG_ERR, "read config file: %s", path);
|
---|
[821] | 489 | }
|
---|
| 490 | } /* End Function read_config_file */
|
---|
| 491 |
|
---|
[1765] | 492 | static void process_config_line(const char *line, unsigned long *event_mask)
|
---|
[821] | 493 | /* [SUMMARY] Process a line from a configuration file.
|
---|
| 494 | <line> The configuration line.
|
---|
| 495 | <event_mask> The event mask is written here. This is not initialised.
|
---|
| 496 | [RETURNS] Nothing.
|
---|
| 497 | */
|
---|
| 498 | {
|
---|
| 499 | int num_args, count;
|
---|
| 500 | struct config_entry_struct *new;
|
---|
| 501 | char p[MAX_ARGS][STRING_LENGTH];
|
---|
| 502 | char when[STRING_LENGTH], what[STRING_LENGTH];
|
---|
| 503 | char name[STRING_LENGTH];
|
---|
[1765] | 504 | const char *msg = "";
|
---|
[821] | 505 | char *ptr;
|
---|
| 506 | int i;
|
---|
| 507 |
|
---|
| 508 | /* !!!! Only Uppercase Keywords in devsfd.conf */
|
---|
[1765] | 509 | static const char options[] ALIGN1 =
|
---|
| 510 | "CLEAR_CONFIG\0""INCLUDE\0""OPTIONAL_INCLUDE\0"
|
---|
| 511 | "RESTORE\0""PERMISSIONS\0""MODLOAD\0""EXECUTE\0"
|
---|
| 512 | "COPY\0""IGNORE\0""MKOLDCOMPAT\0""MKNEWCOMPAT\0"
|
---|
| 513 | "RMOLDCOMPAT\0""RMNEWCOMPAT\0";
|
---|
[821] | 514 |
|
---|
[1765] | 515 | for (count = 0; count < MAX_ARGS; ++count)
|
---|
| 516 | p[count][0] = '\0';
|
---|
| 517 | num_args = sscanf(line, "%s %s %s %s %s %s %s %s %s %s",
|
---|
[821] | 518 | when, name, what,
|
---|
| 519 | p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
|
---|
| 520 |
|
---|
[1765] | 521 | i = index_in_strings(options, when);
|
---|
[821] | 522 |
|
---|
[1765] | 523 | /* "CLEAR_CONFIG" */
|
---|
| 524 | if (i == 0) {
|
---|
| 525 | free_config();
|
---|
[821] | 526 | *event_mask = 0;
|
---|
| 527 | return;
|
---|
| 528 | }
|
---|
| 529 |
|
---|
[1765] | 530 | if (num_args < 2)
|
---|
[821] | 531 | goto process_config_line_err;
|
---|
| 532 |
|
---|
| 533 | /* "INCLUDE" & "OPTIONAL_INCLUDE" */
|
---|
[1765] | 534 | if (i == 1 || i == 2) {
|
---|
| 535 | st_expr_expand(name, STRING_LENGTH, name, get_variable, NULL);
|
---|
| 536 | info_logger(LOG_INFO, "%sinclude: %s", (toupper(when[0]) == 'I') ? "": "optional_", name);
|
---|
| 537 | read_config_file(name, (toupper(when[0]) == 'I') ? FALSE : TRUE, event_mask);
|
---|
[821] | 538 | return;
|
---|
| 539 | }
|
---|
| 540 | /* "RESTORE" */
|
---|
[1765] | 541 | if (i == 3) {
|
---|
| 542 | dir_operation(RESTORE, name, strlen(name),NULL);
|
---|
[821] | 543 | return;
|
---|
| 544 | }
|
---|
| 545 | if (num_args < 3)
|
---|
| 546 | goto process_config_line_err;
|
---|
| 547 |
|
---|
[1765] | 548 | new = xzalloc(sizeof *new);
|
---|
[821] | 549 |
|
---|
[1765] | 550 | for (count = 0; event_types[count].config_name != NULL; ++count) {
|
---|
| 551 | if (strcasecmp(when, event_types[count].config_name) != 0)
|
---|
[821] | 552 | continue;
|
---|
| 553 | new->action.when = event_types[count].type;
|
---|
| 554 | break;
|
---|
| 555 | }
|
---|
[1765] | 556 | if (event_types[count].config_name == NULL) {
|
---|
| 557 | msg = "WHEN in";
|
---|
[821] | 558 | goto process_config_line_err;
|
---|
| 559 | }
|
---|
| 560 |
|
---|
[1765] | 561 | i = index_in_strings(options, what);
|
---|
[821] | 562 |
|
---|
[1765] | 563 | switch (i) {
|
---|
[821] | 564 | case 4: /* "PERMISSIONS" */
|
---|
| 565 | new->action.what = AC_PERMISSIONS;
|
---|
| 566 | /* Get user and group */
|
---|
[2725] | 567 | ptr = strchr(p[0], '.');
|
---|
| 568 | if (ptr == NULL) {
|
---|
[1765] | 569 | msg = "UID.GID";
|
---|
[821] | 570 | goto process_config_line_err; /*"missing '.' in UID.GID"*/
|
---|
| 571 | }
|
---|
| 572 |
|
---|
| 573 | *ptr++ = '\0';
|
---|
[1765] | 574 | new->u.permissions.uid = get_uid_gid(UID, p[0]);
|
---|
| 575 | new->u.permissions.gid = get_uid_gid(GID, ptr);
|
---|
[821] | 576 | /* Get mode */
|
---|
[1765] | 577 | new->u.permissions.mode = get_mode(p[1]);
|
---|
[821] | 578 | break;
|
---|
| 579 | case 5: /* MODLOAD */
|
---|
[1765] | 580 | /*This action will pass "/dev/$devname"(i.e. "/dev/" prefixed to
|
---|
[821] | 581 | the device name) to the module loading facility. In addition,
|
---|
| 582 | the /etc/modules.devfs configuration file is used.*/
|
---|
[3232] | 583 | if (ENABLE_DEVFSD_MODLOAD)
|
---|
[821] | 584 | new->action.what = AC_MODLOAD;
|
---|
[3232] | 585 | break;
|
---|
[821] | 586 | case 6: /* EXECUTE */
|
---|
| 587 | new->action.what = AC_EXECUTE;
|
---|
| 588 | num_args -= 3;
|
---|
| 589 |
|
---|
| 590 | for (count = 0; count < num_args; ++count)
|
---|
[1765] | 591 | new->u.execute.argv[count] = xstrdup(p[count]);
|
---|
[821] | 592 |
|
---|
| 593 | new->u.execute.argv[num_args] = NULL;
|
---|
| 594 | break;
|
---|
| 595 | case 7: /* COPY */
|
---|
| 596 | new->action.what = AC_COPY;
|
---|
| 597 | num_args -= 3;
|
---|
| 598 | if (num_args != 2)
|
---|
| 599 | goto process_config_line_err; /* missing path and function in line */
|
---|
| 600 |
|
---|
[1765] | 601 | new->u.copy.source = xstrdup(p[0]);
|
---|
| 602 | new->u.copy.destination = xstrdup(p[1]);
|
---|
[821] | 603 | break;
|
---|
| 604 | case 8: /* IGNORE */
|
---|
| 605 | /* FALLTROUGH */
|
---|
| 606 | case 9: /* MKOLDCOMPAT */
|
---|
| 607 | /* FALLTROUGH */
|
---|
| 608 | case 10: /* MKNEWCOMPAT */
|
---|
| 609 | /* FALLTROUGH */
|
---|
| 610 | case 11:/* RMOLDCOMPAT */
|
---|
| 611 | /* FALLTROUGH */
|
---|
| 612 | case 12: /* RMNEWCOMPAT */
|
---|
| 613 | /* AC_IGNORE 6
|
---|
| 614 | AC_MKOLDCOMPAT 7
|
---|
| 615 | AC_MKNEWCOMPAT 8
|
---|
| 616 | AC_RMOLDCOMPAT 9
|
---|
| 617 | AC_RMNEWCOMPAT 10*/
|
---|
| 618 | new->action.what = i - 2;
|
---|
| 619 | break;
|
---|
| 620 | default:
|
---|
[1765] | 621 | msg = "WHAT in";
|
---|
[821] | 622 | goto process_config_line_err;
|
---|
| 623 | /*esac*/
|
---|
| 624 | } /* switch (i) */
|
---|
| 625 |
|
---|
[1765] | 626 | xregcomp(&new->preg, name, REG_EXTENDED);
|
---|
[821] | 627 |
|
---|
| 628 | *event_mask |= 1 << new->action.when;
|
---|
| 629 | new->next = NULL;
|
---|
| 630 | if (first_config == NULL)
|
---|
| 631 | first_config = new;
|
---|
| 632 | else
|
---|
| 633 | last_config->next = new;
|
---|
| 634 | last_config = new;
|
---|
| 635 | return;
|
---|
[1765] | 636 |
|
---|
| 637 | process_config_line_err:
|
---|
[821] | 638 | msg_logger_and_die(LOG_ERR, bb_msg_bad_config, msg , line);
|
---|
| 639 | } /* End Function process_config_line */
|
---|
| 640 |
|
---|
[1765] | 641 | static int do_servicing(int fd, unsigned long event_mask)
|
---|
[821] | 642 | /* [SUMMARY] Service devfs changes until a signal is received.
|
---|
| 643 | <fd> The open control file.
|
---|
| 644 | <event_mask> The event mask.
|
---|
| 645 | [RETURNS] TRUE if SIGHUP was caught, else FALSE.
|
---|
| 646 | */
|
---|
| 647 | {
|
---|
| 648 | ssize_t bytes;
|
---|
| 649 | struct devfsd_notify_struct info;
|
---|
| 650 |
|
---|
[1765] | 651 | /* (void*) cast is only in order to match prototype */
|
---|
| 652 | xioctl(fd, DEVFSDIOC_SET_EVENT_MASK, (void*)event_mask);
|
---|
| 653 | while (!caught_signal) {
|
---|
[821] | 654 | errno = 0;
|
---|
[2725] | 655 | bytes = read(fd, (char *) &info, sizeof info);
|
---|
[821] | 656 | if (caught_signal)
|
---|
| 657 | break; /* Must test for this first */
|
---|
| 658 | if (errno == EINTR)
|
---|
| 659 | continue; /* Yes, the order is important */
|
---|
| 660 | if (bytes < 1)
|
---|
| 661 | break;
|
---|
[1765] | 662 | service_name(&info);
|
---|
[821] | 663 | }
|
---|
[1765] | 664 | if (caught_signal) {
|
---|
[821] | 665 | int c_sighup = caught_sighup;
|
---|
| 666 |
|
---|
| 667 | caught_signal = FALSE;
|
---|
| 668 | caught_sighup = FALSE;
|
---|
[1765] | 669 | return c_sighup;
|
---|
[821] | 670 | }
|
---|
| 671 | msg_logger_and_die(LOG_ERR, "read error on control file");
|
---|
| 672 | } /* End Function do_servicing */
|
---|
| 673 |
|
---|
[1765] | 674 | static void service_name(const struct devfsd_notify_struct *info)
|
---|
[821] | 675 | /* [SUMMARY] Service a single devfs change.
|
---|
| 676 | <info> The devfs change.
|
---|
| 677 | [RETURNS] Nothing.
|
---|
| 678 | */
|
---|
| 679 | {
|
---|
| 680 | unsigned int n;
|
---|
| 681 | regmatch_t mbuf[MAX_SUBEXPR];
|
---|
| 682 | struct config_entry_struct *entry;
|
---|
| 683 |
|
---|
| 684 | if (ENABLE_DEBUG && info->overrun_count > 0)
|
---|
[1765] | 685 | msg_logger(LOG_ERR, "lost %u events", info->overrun_count);
|
---|
[821] | 686 |
|
---|
| 687 | /* Discard lookups on "/dev/log" and "/dev/initctl" */
|
---|
[1765] | 688 | if (info->type == DEVFSD_NOTIFY_LOOKUP
|
---|
| 689 | && ((info->devname[0] == 'l' && info->devname[1] == 'o'
|
---|
| 690 | && info->devname[2] == 'g' && !info->devname[3])
|
---|
| 691 | || (info->devname[0] == 'i' && info->devname[1] == 'n'
|
---|
| 692 | && info->devname[2] == 'i' && info->devname[3] == 't'
|
---|
| 693 | && info->devname[4] == 'c' && info->devname[5] == 't'
|
---|
| 694 | && info->devname[6] == 'l' && !info->devname[7]))
|
---|
| 695 | )
|
---|
| 696 | return;
|
---|
| 697 |
|
---|
| 698 | for (entry = first_config; entry != NULL; entry = entry->next) {
|
---|
[821] | 699 | /* First check if action matches the type, then check if name matches */
|
---|
[1765] | 700 | if (info->type != entry->action.when
|
---|
| 701 | || regexec(&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0)
|
---|
[821] | 702 | continue;
|
---|
[1765] | 703 | for (n = 0;(n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
|
---|
[821] | 704 | /* VOID */;
|
---|
| 705 |
|
---|
[1765] | 706 | switch (entry->action.what) {
|
---|
[821] | 707 | case AC_PERMISSIONS:
|
---|
[1765] | 708 | action_permissions(info, entry);
|
---|
[821] | 709 | break;
|
---|
| 710 | case AC_MODLOAD:
|
---|
[1765] | 711 | if (ENABLE_DEVFSD_MODLOAD)
|
---|
| 712 | action_modload(info, entry);
|
---|
[821] | 713 | break;
|
---|
| 714 | case AC_EXECUTE:
|
---|
[1765] | 715 | action_execute(info, entry, mbuf, n);
|
---|
[821] | 716 | break;
|
---|
| 717 | case AC_COPY:
|
---|
[1765] | 718 | action_copy(info, entry, mbuf, n);
|
---|
[821] | 719 | break;
|
---|
| 720 | case AC_IGNORE:
|
---|
| 721 | return;
|
---|
| 722 | /*break;*/
|
---|
| 723 | case AC_MKOLDCOMPAT:
|
---|
| 724 | case AC_MKNEWCOMPAT:
|
---|
| 725 | case AC_RMOLDCOMPAT:
|
---|
| 726 | case AC_RMNEWCOMPAT:
|
---|
[1765] | 727 | action_compat(info, entry->action.what);
|
---|
[821] | 728 | break;
|
---|
| 729 | default:
|
---|
| 730 | msg_logger_and_die(LOG_ERR, "Unknown action");
|
---|
| 731 | }
|
---|
| 732 | }
|
---|
| 733 | } /* End Function service_name */
|
---|
| 734 |
|
---|
[1765] | 735 | static void action_permissions(const struct devfsd_notify_struct *info,
|
---|
[821] | 736 | const struct config_entry_struct *entry)
|
---|
| 737 | /* [SUMMARY] Update permissions for a device entry.
|
---|
| 738 | <info> The devfs change.
|
---|
| 739 | <entry> The config file entry.
|
---|
| 740 | [RETURNS] Nothing.
|
---|
| 741 | */
|
---|
| 742 | {
|
---|
| 743 | struct stat statbuf;
|
---|
| 744 |
|
---|
[1765] | 745 | if (stat(info->devname, &statbuf) != 0
|
---|
| 746 | || chmod(info->devname, (statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0
|
---|
| 747 | || chown(info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0
|
---|
| 748 | )
|
---|
| 749 | error_logger(LOG_ERR, "Can't chmod or chown: %s", info->devname);
|
---|
[821] | 750 | } /* End Function action_permissions */
|
---|
| 751 |
|
---|
[1765] | 752 | static void action_modload(const struct devfsd_notify_struct *info,
|
---|
[3232] | 753 | const struct config_entry_struct *entry UNUSED_PARAM)
|
---|
[821] | 754 | /* [SUMMARY] Load a module.
|
---|
| 755 | <info> The devfs change.
|
---|
| 756 | <entry> The config file entry.
|
---|
| 757 | [RETURNS] Nothing.
|
---|
| 758 | */
|
---|
| 759 | {
|
---|
| 760 | char *argv[6];
|
---|
| 761 |
|
---|
[1765] | 762 | argv[0] = (char*)MODPROBE;
|
---|
| 763 | argv[1] = (char*)MODPROBE_SWITCH_1; /* "-k" */
|
---|
| 764 | argv[2] = (char*)MODPROBE_SWITCH_2; /* "-C" */
|
---|
| 765 | argv[3] = (char*)CONFIG_MODULES_DEVFS;
|
---|
| 766 | argv[4] = concat_path_file("/dev", info->devname); /* device */
|
---|
[821] | 767 | argv[5] = NULL;
|
---|
| 768 |
|
---|
[2725] | 769 | spawn_and_wait(argv);
|
---|
[1765] | 770 | free(argv[4]);
|
---|
[821] | 771 | } /* End Function action_modload */
|
---|
| 772 |
|
---|
[1765] | 773 | static void action_execute(const struct devfsd_notify_struct *info,
|
---|
[3232] | 774 | const struct config_entry_struct *entry,
|
---|
| 775 | const regmatch_t *regexpr, unsigned int numexpr)
|
---|
[821] | 776 | /* [SUMMARY] Execute a programme.
|
---|
| 777 | <info> The devfs change.
|
---|
| 778 | <entry> The config file entry.
|
---|
[1765] | 779 | <regexpr> The number of subexpression(start, end) offsets within the
|
---|
[821] | 780 | device name.
|
---|
| 781 | <numexpr> The number of elements within <<regexpr>>.
|
---|
| 782 | [RETURNS] Nothing.
|
---|
| 783 | */
|
---|
| 784 | {
|
---|
| 785 | unsigned int count;
|
---|
| 786 | struct get_variable_info gv_info;
|
---|
| 787 | char *argv[MAX_ARGS + 1];
|
---|
| 788 | char largv[MAX_ARGS + 1][STRING_LENGTH];
|
---|
| 789 |
|
---|
| 790 | gv_info.info = info;
|
---|
| 791 | gv_info.devname = info->devname;
|
---|
[1765] | 792 | snprintf(gv_info.devpath, sizeof(gv_info.devpath), "%s/%s", mount_point, info->devname);
|
---|
| 793 | for (count = 0; entry->u.execute.argv[count] != NULL; ++count) {
|
---|
| 794 | expand_expression(largv[count], STRING_LENGTH,
|
---|
[821] | 795 | entry->u.execute.argv[count],
|
---|
| 796 | get_variable, &gv_info,
|
---|
[1765] | 797 | gv_info.devname, regexpr, numexpr);
|
---|
[821] | 798 | argv[count] = largv[count];
|
---|
| 799 | }
|
---|
| 800 | argv[count] = NULL;
|
---|
[2725] | 801 | spawn_and_wait(argv);
|
---|
[821] | 802 | } /* End Function action_execute */
|
---|
| 803 |
|
---|
| 804 |
|
---|
[1765] | 805 | static void action_copy(const struct devfsd_notify_struct *info,
|
---|
[3232] | 806 | const struct config_entry_struct *entry,
|
---|
| 807 | const regmatch_t *regexpr, unsigned int numexpr)
|
---|
[821] | 808 | /* [SUMMARY] Copy permissions.
|
---|
| 809 | <info> The devfs change.
|
---|
| 810 | <entry> The config file entry.
|
---|
[1765] | 811 | <regexpr> This list of subexpression(start, end) offsets within the
|
---|
[821] | 812 | device name.
|
---|
| 813 | <numexpr> The number of elements in <<regexpr>>.
|
---|
| 814 | [RETURNS] Nothing.
|
---|
| 815 | */
|
---|
| 816 | {
|
---|
| 817 | mode_t new_mode;
|
---|
| 818 | struct get_variable_info gv_info;
|
---|
| 819 | struct stat source_stat, dest_stat;
|
---|
| 820 | char source[STRING_LENGTH], destination[STRING_LENGTH];
|
---|
| 821 | int ret = 0;
|
---|
| 822 |
|
---|
| 823 | dest_stat.st_mode = 0;
|
---|
| 824 |
|
---|
[1765] | 825 | if ((info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK(info->mode))
|
---|
[821] | 826 | return;
|
---|
| 827 | gv_info.info = info;
|
---|
| 828 | gv_info.devname = info->devname;
|
---|
| 829 |
|
---|
[1765] | 830 | snprintf(gv_info.devpath, sizeof(gv_info.devpath), "%s/%s", mount_point, info->devname);
|
---|
| 831 | expand_expression(source, STRING_LENGTH, entry->u.copy.source,
|
---|
[821] | 832 | get_variable, &gv_info, gv_info.devname,
|
---|
| 833 | regexpr, numexpr);
|
---|
| 834 |
|
---|
[1765] | 835 | expand_expression(destination, STRING_LENGTH, entry->u.copy.destination,
|
---|
[821] | 836 | get_variable, &gv_info, gv_info.devname,
|
---|
| 837 | regexpr, numexpr);
|
---|
| 838 |
|
---|
[1765] | 839 | if (!make_dir_tree(destination) || lstat(source, &source_stat) != 0)
|
---|
[821] | 840 | return;
|
---|
[1765] | 841 | lstat(destination, &dest_stat);
|
---|
[821] | 842 | new_mode = source_stat.st_mode & ~S_ISVTX;
|
---|
| 843 | if (info->type == DEVFSD_NOTIFY_CREATE)
|
---|
| 844 | new_mode |= S_ISVTX;
|
---|
[1765] | 845 | else if ((info->type == DEVFSD_NOTIFY_CHANGE) &&(dest_stat.st_mode & S_ISVTX))
|
---|
[821] | 846 | new_mode |= S_ISVTX;
|
---|
[1765] | 847 | ret = copy_inode(destination, &dest_stat, new_mode, source, &source_stat);
|
---|
[821] | 848 | if (ENABLE_DEBUG && ret && (errno != EEXIST))
|
---|
[1765] | 849 | error_logger(LOG_ERR, "copy_inode: %s to %s", source, destination);
|
---|
[821] | 850 | } /* End Function action_copy */
|
---|
| 851 |
|
---|
[1765] | 852 | static void action_compat(const struct devfsd_notify_struct *info, unsigned int action)
|
---|
[821] | 853 | /* [SUMMARY] Process a compatibility request.
|
---|
| 854 | <info> The devfs change.
|
---|
| 855 | <action> The action to take.
|
---|
| 856 | [RETURNS] Nothing.
|
---|
| 857 | */
|
---|
| 858 | {
|
---|
| 859 | int ret;
|
---|
| 860 | const char *compat_name = NULL;
|
---|
| 861 | const char *dest_name = info->devname;
|
---|
[1765] | 862 | const char *ptr;
|
---|
[821] | 863 | char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
|
---|
| 864 | int mode, host, bus, target, lun;
|
---|
| 865 | unsigned int i;
|
---|
| 866 | char rewind_;
|
---|
| 867 | /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */
|
---|
| 868 | static const char *const fmt[] = {
|
---|
| 869 | NULL ,
|
---|
| 870 | "sg/c%db%dt%du%d", /* scsi/generic */
|
---|
| 871 | "sd/c%db%dt%du%d", /* scsi/disc */
|
---|
| 872 | "sr/c%db%dt%du%d", /* scsi/cd */
|
---|
| 873 | "sd/c%db%dt%du%dp%d", /* scsi/part */
|
---|
| 874 | "st/c%db%dt%du%dm%d%c", /* scsi/mt */
|
---|
| 875 | "ide/hd/c%db%dt%du%d", /* ide/host/disc */
|
---|
| 876 | "ide/cd/c%db%dt%du%d", /* ide/host/cd */
|
---|
| 877 | "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */
|
---|
| 878 | "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */
|
---|
| 879 | NULL
|
---|
| 880 | };
|
---|
| 881 |
|
---|
| 882 | /* First construct compatibility name */
|
---|
[1765] | 883 | switch (action) {
|
---|
[821] | 884 | case AC_MKOLDCOMPAT:
|
---|
| 885 | case AC_RMOLDCOMPAT:
|
---|
[1765] | 886 | compat_name = get_old_name(info->devname, info->namelen, compat_buf, info->major, info->minor);
|
---|
[821] | 887 | break;
|
---|
| 888 | case AC_MKNEWCOMPAT:
|
---|
| 889 | case AC_RMNEWCOMPAT:
|
---|
[1765] | 890 | ptr = bb_basename(info->devname);
|
---|
| 891 | i = scan_dev_name(info->devname, info->namelen, ptr);
|
---|
[821] | 892 |
|
---|
| 893 | /* nothing found */
|
---|
[1765] | 894 | if (i == 0 || i > 9)
|
---|
[821] | 895 | return;
|
---|
| 896 |
|
---|
[1765] | 897 | sscanf(info->devname + ((i < 6) ? 5 : 4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun);
|
---|
| 898 | snprintf(dest_buf, sizeof(dest_buf), "../%s", info->devname + (( i > 5) ? 4 : 0));
|
---|
[821] | 899 | dest_name = dest_buf;
|
---|
| 900 | compat_name = compat_buf;
|
---|
| 901 |
|
---|
| 902 |
|
---|
| 903 | /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */
|
---|
[1765] | 904 | if (i == 1 || i == 2 || i == 3 || i == 6 || i ==7)
|
---|
| 905 | sprintf(compat_buf, fmt[i], host, bus, target, lun);
|
---|
[821] | 906 |
|
---|
| 907 | /* 4 == scsi/part 8 == ide/host/part */
|
---|
[1765] | 908 | if (i == 4 || i == 8)
|
---|
| 909 | sprintf(compat_buf, fmt[i], host, bus, target, lun, atoi(ptr + 4));
|
---|
[821] | 910 |
|
---|
| 911 | /* 5 == scsi/mt */
|
---|
[1765] | 912 | if (i == 5) {
|
---|
[821] | 913 | rewind_ = info->devname[info->namelen - 1];
|
---|
| 914 | if (rewind_ != 'n')
|
---|
| 915 | rewind_ = '\0';
|
---|
| 916 | mode=0;
|
---|
[1765] | 917 | if (ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/)
|
---|
[821] | 918 | mode = ptr[2] - 107; /* 1 or 2 */
|
---|
[1765] | 919 | if (ptr[2] == 'a')
|
---|
[821] | 920 | mode = 3;
|
---|
[1765] | 921 | sprintf(compat_buf, fmt[i], host, bus, target, lun, mode, rewind_);
|
---|
[821] | 922 | }
|
---|
| 923 |
|
---|
| 924 | /* 9 == ide/host/mt */
|
---|
[1765] | 925 | if (i == 9)
|
---|
| 926 | snprintf(compat_buf, sizeof(compat_buf), fmt[i], host, bus, target, lun, ptr + 2);
|
---|
[821] | 927 | /* esac */
|
---|
[1765] | 928 | } /* switch (action) */
|
---|
[821] | 929 |
|
---|
[1765] | 930 | if (compat_name == NULL)
|
---|
[821] | 931 | return;
|
---|
| 932 |
|
---|
| 933 | /* Now decide what to do with it */
|
---|
[1765] | 934 | switch (action) {
|
---|
[821] | 935 | case AC_MKOLDCOMPAT:
|
---|
| 936 | case AC_MKNEWCOMPAT:
|
---|
[1765] | 937 | mksymlink(dest_name, compat_name);
|
---|
[821] | 938 | break;
|
---|
| 939 | case AC_RMOLDCOMPAT:
|
---|
| 940 | case AC_RMNEWCOMPAT:
|
---|
[1765] | 941 | ret = unlink(compat_name);
|
---|
[821] | 942 | if (ENABLE_DEBUG && ret)
|
---|
[1765] | 943 | error_logger(LOG_ERR, "unlink: %s", compat_name);
|
---|
[821] | 944 | break;
|
---|
| 945 | /*esac*/
|
---|
[1765] | 946 | } /* switch (action) */
|
---|
[821] | 947 | } /* End Function action_compat */
|
---|
| 948 |
|
---|
| 949 | static void restore(char *spath, struct stat source_stat, int rootlen)
|
---|
| 950 | {
|
---|
[1765] | 951 | char *dpath;
|
---|
[821] | 952 | struct stat dest_stat;
|
---|
| 953 |
|
---|
| 954 | dest_stat.st_mode = 0;
|
---|
[1765] | 955 | dpath = concat_path_file(mount_point, spath + rootlen);
|
---|
| 956 | lstat(dpath, &dest_stat);
|
---|
| 957 | free(dpath);
|
---|
| 958 | if (S_ISLNK(source_stat.st_mode) || (source_stat.st_mode & S_ISVTX))
|
---|
[2725] | 959 | copy_inode(dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX), spath, &source_stat);
|
---|
[821] | 960 |
|
---|
[1765] | 961 | if (S_ISDIR(source_stat.st_mode))
|
---|
[2725] | 962 | dir_operation(RESTORE, spath, rootlen, NULL);
|
---|
[821] | 963 | }
|
---|
| 964 |
|
---|
| 965 |
|
---|
[1765] | 966 | static int copy_inode(const char *destpath, const struct stat *dest_stat,
|
---|
[821] | 967 | mode_t new_mode,
|
---|
| 968 | const char *sourcepath, const struct stat *source_stat)
|
---|
| 969 | /* [SUMMARY] Copy an inode.
|
---|
| 970 | <destpath> The destination path. An existing inode may be deleted.
|
---|
| 971 | <dest_stat> The destination stat(2) information.
|
---|
| 972 | <new_mode> The desired new mode for the destination.
|
---|
| 973 | <sourcepath> The source path.
|
---|
| 974 | <source_stat> The source stat(2) information.
|
---|
| 975 | [RETURNS] TRUE on success, else FALSE.
|
---|
| 976 | */
|
---|
| 977 | {
|
---|
| 978 | int source_len, dest_len;
|
---|
| 979 | char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
|
---|
| 980 | int fd, val;
|
---|
| 981 | struct sockaddr_un un_addr;
|
---|
| 982 | char symlink_val[STRING_LENGTH];
|
---|
| 983 |
|
---|
[1765] | 984 | if ((source_stat->st_mode & S_IFMT) ==(dest_stat->st_mode & S_IFMT)) {
|
---|
[821] | 985 | /* Same type */
|
---|
[1765] | 986 | if (S_ISLNK(source_stat->st_mode)) {
|
---|
[2725] | 987 | source_len = readlink(sourcepath, source_link, STRING_LENGTH - 1);
|
---|
| 988 | if ((source_len < 0)
|
---|
| 989 | || (dest_len = readlink(destpath, dest_link, STRING_LENGTH - 1)) < 0
|
---|
[1765] | 990 | )
|
---|
| 991 | return FALSE;
|
---|
[821] | 992 | source_link[source_len] = '\0';
|
---|
| 993 | dest_link[dest_len] = '\0';
|
---|
[1765] | 994 | if ((source_len != dest_len) || (strcmp(source_link, dest_link) != 0)) {
|
---|
| 995 | unlink(destpath);
|
---|
| 996 | symlink(source_link, destpath);
|
---|
[821] | 997 | }
|
---|
[1765] | 998 | return TRUE;
|
---|
[821] | 999 | } /* Else not a symlink */
|
---|
[1765] | 1000 | chmod(destpath, new_mode & ~S_IFMT);
|
---|
| 1001 | chown(destpath, source_stat->st_uid, source_stat->st_gid);
|
---|
| 1002 | return TRUE;
|
---|
[821] | 1003 | }
|
---|
| 1004 | /* Different types: unlink and create */
|
---|
[1765] | 1005 | unlink(destpath);
|
---|
| 1006 | switch (source_stat->st_mode & S_IFMT) {
|
---|
[821] | 1007 | case S_IFSOCK:
|
---|
[2725] | 1008 | fd = socket(AF_UNIX, SOCK_STREAM, 0);
|
---|
| 1009 | if (fd < 0)
|
---|
[821] | 1010 | break;
|
---|
| 1011 | un_addr.sun_family = AF_UNIX;
|
---|
[1765] | 1012 | snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s", destpath);
|
---|
[2725] | 1013 | val = bind(fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr);
|
---|
[1765] | 1014 | close(fd);
|
---|
| 1015 | if (val != 0 || chmod(destpath, new_mode & ~S_IFMT) != 0)
|
---|
[821] | 1016 | break;
|
---|
| 1017 | goto do_chown;
|
---|
| 1018 | case S_IFLNK:
|
---|
[2725] | 1019 | val = readlink(sourcepath, symlink_val, STRING_LENGTH - 1);
|
---|
| 1020 | if (val < 0)
|
---|
[821] | 1021 | break;
|
---|
| 1022 | symlink_val[val] = '\0';
|
---|
[1765] | 1023 | if (symlink(symlink_val, destpath) == 0)
|
---|
| 1024 | return TRUE;
|
---|
[821] | 1025 | break;
|
---|
| 1026 | case S_IFREG:
|
---|
[2725] | 1027 | fd = open(destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT);
|
---|
| 1028 | if (fd < 0)
|
---|
[821] | 1029 | break;
|
---|
[1765] | 1030 | close(fd);
|
---|
| 1031 | if (chmod(destpath, new_mode & ~S_IFMT) != 0)
|
---|
[821] | 1032 | break;
|
---|
| 1033 | goto do_chown;
|
---|
| 1034 | case S_IFBLK:
|
---|
| 1035 | case S_IFCHR:
|
---|
| 1036 | case S_IFIFO:
|
---|
[1765] | 1037 | if (mknod(destpath, new_mode, source_stat->st_rdev) != 0)
|
---|
[821] | 1038 | break;
|
---|
| 1039 | goto do_chown;
|
---|
| 1040 | case S_IFDIR:
|
---|
[1765] | 1041 | if (mkdir(destpath, new_mode & ~S_IFMT) != 0)
|
---|
[821] | 1042 | break;
|
---|
| 1043 | do_chown:
|
---|
[1765] | 1044 | if (chown(destpath, source_stat->st_uid, source_stat->st_gid) == 0)
|
---|
| 1045 | return TRUE;
|
---|
[821] | 1046 | /*break;*/
|
---|
| 1047 | }
|
---|
[1765] | 1048 | return FALSE;
|
---|
[821] | 1049 | } /* End Function copy_inode */
|
---|
| 1050 |
|
---|
[1765] | 1051 | static void free_config(void)
|
---|
[821] | 1052 | /* [SUMMARY] Free the configuration information.
|
---|
| 1053 | [RETURNS] Nothing.
|
---|
| 1054 | */
|
---|
| 1055 | {
|
---|
| 1056 | struct config_entry_struct *c_entry;
|
---|
| 1057 | void *next;
|
---|
| 1058 |
|
---|
[1765] | 1059 | for (c_entry = first_config; c_entry != NULL; c_entry = next) {
|
---|
[821] | 1060 | unsigned int count;
|
---|
| 1061 |
|
---|
| 1062 | next = c_entry->next;
|
---|
[1765] | 1063 | regfree(&c_entry->preg);
|
---|
| 1064 | if (c_entry->action.what == AC_EXECUTE) {
|
---|
| 1065 | for (count = 0; count < MAX_ARGS; ++count) {
|
---|
[821] | 1066 | if (c_entry->u.execute.argv[count] == NULL)
|
---|
| 1067 | break;
|
---|
[1765] | 1068 | free(c_entry->u.execute.argv[count]);
|
---|
[821] | 1069 | }
|
---|
| 1070 | }
|
---|
[1765] | 1071 | free(c_entry);
|
---|
[821] | 1072 | }
|
---|
| 1073 | first_config = NULL;
|
---|
| 1074 | last_config = NULL;
|
---|
| 1075 | } /* End Function free_config */
|
---|
| 1076 |
|
---|
[1765] | 1077 | static int get_uid_gid(int flag, const char *string)
|
---|
[821] | 1078 | /* [SUMMARY] Convert a string to a UID or GID value.
|
---|
| 1079 | <flag> "UID" or "GID".
|
---|
| 1080 | <string> The string.
|
---|
| 1081 | [RETURNS] The UID or GID value.
|
---|
| 1082 | */
|
---|
| 1083 | {
|
---|
| 1084 | struct passwd *pw_ent;
|
---|
| 1085 | struct group *grp_ent;
|
---|
[1765] | 1086 | static const char *msg;
|
---|
[821] | 1087 |
|
---|
| 1088 | if (ENABLE_DEVFSD_VERBOSE)
|
---|
[1765] | 1089 | msg = "user";
|
---|
[821] | 1090 |
|
---|
[1765] | 1091 | if (isdigit(string[0]) ||((string[0] == '-') && isdigit(string[1])))
|
---|
| 1092 | return atoi(string);
|
---|
[821] | 1093 |
|
---|
[2725] | 1094 | if (flag == UID && (pw_ent = getpwnam(string)) != NULL)
|
---|
[1765] | 1095 | return pw_ent->pw_uid;
|
---|
[821] | 1096 |
|
---|
[1765] | 1097 | if (flag == GID && (grp_ent = getgrnam(string)) != NULL)
|
---|
| 1098 | return grp_ent->gr_gid;
|
---|
| 1099 | else if (ENABLE_DEVFSD_VERBOSE)
|
---|
| 1100 | msg = "group";
|
---|
[821] | 1101 |
|
---|
[1765] | 1102 | if (ENABLE_DEVFSD_VERBOSE)
|
---|
[2725] | 1103 | msg_logger(LOG_ERR, "unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]);
|
---|
[1765] | 1104 | return 0;
|
---|
[821] | 1105 | }/* End Function get_uid_gid */
|
---|
| 1106 |
|
---|
[1765] | 1107 | static mode_t get_mode(const char *string)
|
---|
[821] | 1108 | /* [SUMMARY] Convert a string to a mode value.
|
---|
| 1109 | <string> The string.
|
---|
| 1110 | [RETURNS] The mode value.
|
---|
| 1111 | */
|
---|
| 1112 | {
|
---|
| 1113 | mode_t mode;
|
---|
| 1114 | int i;
|
---|
| 1115 |
|
---|
[1765] | 1116 | if (isdigit(string[0]))
|
---|
| 1117 | return strtoul(string, NULL, 8);
|
---|
| 1118 | if (strlen(string) != 9)
|
---|
[821] | 1119 | msg_logger_and_die(LOG_ERR, "bad mode: %s", string);
|
---|
| 1120 |
|
---|
| 1121 | mode = 0;
|
---|
[1765] | 1122 | i = S_IRUSR;
|
---|
| 1123 | while (i > 0) {
|
---|
| 1124 | if (string[0] == 'r' || string[0] == 'w' || string[0] == 'x')
|
---|
| 1125 | mode += i;
|
---|
| 1126 | i = i / 2;
|
---|
[821] | 1127 | string++;
|
---|
| 1128 | }
|
---|
[1765] | 1129 | return mode;
|
---|
[821] | 1130 | } /* End Function get_mode */
|
---|
| 1131 |
|
---|
[1765] | 1132 | static void signal_handler(int sig)
|
---|
[821] | 1133 | {
|
---|
| 1134 | caught_signal = TRUE;
|
---|
| 1135 | if (sig == SIGHUP)
|
---|
| 1136 | caught_sighup = TRUE;
|
---|
| 1137 |
|
---|
[1765] | 1138 | info_logger(LOG_INFO, "Caught signal %d", sig);
|
---|
[821] | 1139 | } /* End Function signal_handler */
|
---|
| 1140 |
|
---|
[1765] | 1141 | static const char *get_variable(const char *variable, void *info)
|
---|
[821] | 1142 | {
|
---|
[1765] | 1143 | static char sbuf[sizeof(int)*3 + 2]; /* sign and NUL */
|
---|
[2725] | 1144 | static char *hostname;
|
---|
[1765] | 1145 |
|
---|
[821] | 1146 | struct get_variable_info *gv_info = info;
|
---|
[1765] | 1147 | const char *field_names[] = {
|
---|
| 1148 | "hostname", "mntpt", "devpath", "devname",
|
---|
| 1149 | "uid", "gid", "mode", hostname, mount_point,
|
---|
| 1150 | gv_info->devpath, gv_info->devname, NULL
|
---|
| 1151 | };
|
---|
[821] | 1152 | int i;
|
---|
| 1153 |
|
---|
[2725] | 1154 | if (!hostname)
|
---|
| 1155 | hostname = safe_gethostname();
|
---|
[1765] | 1156 | /* index_in_str_array returns i>=0 */
|
---|
| 1157 | i = index_in_str_array(field_names, variable);
|
---|
[821] | 1158 |
|
---|
[1765] | 1159 | if (i > 6 || i < 0 || (i > 1 && gv_info == NULL))
|
---|
| 1160 | return NULL;
|
---|
| 1161 | if (i >= 0 && i <= 3)
|
---|
| 1162 | return field_names[i + 7];
|
---|
[821] | 1163 |
|
---|
[1765] | 1164 | if (i == 4)
|
---|
| 1165 | sprintf(sbuf, "%u", gv_info->info->uid);
|
---|
| 1166 | else if (i == 5)
|
---|
| 1167 | sprintf(sbuf, "%u", gv_info->info->gid);
|
---|
| 1168 | else if (i == 6)
|
---|
| 1169 | sprintf(sbuf, "%o", gv_info->info->mode);
|
---|
| 1170 | return sbuf;
|
---|
[821] | 1171 | } /* End Function get_variable */
|
---|
| 1172 |
|
---|
| 1173 | static void service(struct stat statbuf, char *path)
|
---|
| 1174 | {
|
---|
| 1175 | struct devfsd_notify_struct info;
|
---|
| 1176 |
|
---|
[1765] | 1177 | memset(&info, 0, sizeof info);
|
---|
[821] | 1178 | info.type = DEVFSD_NOTIFY_REGISTERED;
|
---|
| 1179 | info.mode = statbuf.st_mode;
|
---|
[1765] | 1180 | info.major = major(statbuf.st_rdev);
|
---|
| 1181 | info.minor = minor(statbuf.st_rdev);
|
---|
[821] | 1182 | info.uid = statbuf.st_uid;
|
---|
| 1183 | info.gid = statbuf.st_gid;
|
---|
[1765] | 1184 | snprintf(info.devname, sizeof(info.devname), "%s", path + strlen(mount_point) + 1);
|
---|
| 1185 | info.namelen = strlen(info.devname);
|
---|
| 1186 | service_name(&info);
|
---|
| 1187 | if (S_ISDIR(statbuf.st_mode))
|
---|
| 1188 | dir_operation(SERVICE, path, 0, NULL);
|
---|
[821] | 1189 | }
|
---|
| 1190 |
|
---|
| 1191 | static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask)
|
---|
| 1192 | /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
|
---|
| 1193 | <flag> To choose which function to perform
|
---|
| 1194 | <dp> The directory pointer. This is closed upon completion.
|
---|
| 1195 | <dir_name> The name of the directory.
|
---|
| 1196 | <rootlen> string length parameter.
|
---|
| 1197 | [RETURNS] Nothing.
|
---|
| 1198 | */
|
---|
| 1199 | {
|
---|
| 1200 | struct stat statbuf;
|
---|
| 1201 | DIR *dp;
|
---|
| 1202 | struct dirent *de;
|
---|
[1765] | 1203 | char *path;
|
---|
[821] | 1204 |
|
---|
[2725] | 1205 | dp = warn_opendir(dir_name);
|
---|
| 1206 | if (dp == NULL)
|
---|
[821] | 1207 | return;
|
---|
| 1208 |
|
---|
[1765] | 1209 | while ((de = readdir(dp)) != NULL) {
|
---|
[821] | 1210 |
|
---|
[1765] | 1211 | if (de->d_name && DOT_OR_DOTDOT(de->d_name))
|
---|
[821] | 1212 | continue;
|
---|
[1765] | 1213 | path = concat_path_file(dir_name, de->d_name);
|
---|
| 1214 | if (lstat(path, &statbuf) == 0) {
|
---|
| 1215 | switch (type) {
|
---|
| 1216 | case SERVICE:
|
---|
| 1217 | service(statbuf, path);
|
---|
| 1218 | break;
|
---|
| 1219 | case RESTORE:
|
---|
| 1220 | restore(path, statbuf, var);
|
---|
| 1221 | break;
|
---|
| 1222 | case READ_CONFIG:
|
---|
| 1223 | read_config_file(path, var, event_mask);
|
---|
| 1224 | break;
|
---|
| 1225 | }
|
---|
[821] | 1226 | }
|
---|
[1765] | 1227 | free(path);
|
---|
[821] | 1228 | }
|
---|
[1765] | 1229 | closedir(dp);
|
---|
[821] | 1230 | } /* End Function do_scan_and_service */
|
---|
| 1231 |
|
---|
[1765] | 1232 | static int mksymlink(const char *oldpath, const char *newpath)
|
---|
[821] | 1233 | /* [SUMMARY] Create a symlink, creating intervening directories as required.
|
---|
| 1234 | <oldpath> The string contained in the symlink.
|
---|
| 1235 | <newpath> The name of the new symlink.
|
---|
| 1236 | [RETURNS] 0 on success, else -1.
|
---|
| 1237 | */
|
---|
| 1238 | {
|
---|
[1765] | 1239 | if (!make_dir_tree(newpath))
|
---|
| 1240 | return -1;
|
---|
[821] | 1241 |
|
---|
[1765] | 1242 | if (symlink(oldpath, newpath) != 0) {
|
---|
[821] | 1243 | if (errno != EEXIST)
|
---|
[1765] | 1244 | return -1;
|
---|
[821] | 1245 | }
|
---|
[1765] | 1246 | return 0;
|
---|
[821] | 1247 | } /* End Function mksymlink */
|
---|
| 1248 |
|
---|
| 1249 |
|
---|
[1765] | 1250 | static int make_dir_tree(const char *path)
|
---|
[821] | 1251 | /* [SUMMARY] Creating intervening directories for a path as required.
|
---|
[1765] | 1252 | <path> The full pathname(including the leaf node).
|
---|
[821] | 1253 | [RETURNS] TRUE on success, else FALSE.
|
---|
| 1254 | */
|
---|
| 1255 | {
|
---|
[1765] | 1256 | if (bb_make_directory(dirname((char *)path), -1, FILEUTILS_RECUR) == -1)
|
---|
| 1257 | return FALSE;
|
---|
| 1258 | return TRUE;
|
---|
[821] | 1259 | } /* End Function make_dir_tree */
|
---|
| 1260 |
|
---|
| 1261 | static int expand_expression(char *output, unsigned int outsize,
|
---|
[3232] | 1262 | const char *input,
|
---|
| 1263 | const char *(*get_variable_func)(const char *variable, void *info),
|
---|
| 1264 | void *info,
|
---|
| 1265 | const char *devname,
|
---|
| 1266 | const regmatch_t *ex, unsigned int numexp)
|
---|
[821] | 1267 | /* [SUMMARY] Expand environment variables and regular subexpressions in string.
|
---|
| 1268 | <output> The output expanded expression is written here.
|
---|
| 1269 | <length> The size of the output buffer.
|
---|
| 1270 | <input> The input expression. This may equal <<output>>.
|
---|
| 1271 | <get_variable> A function which will be used to get variable values. If
|
---|
| 1272 | this returns NULL, the environment is searched instead. If this is NULL,
|
---|
| 1273 | only the environment is searched.
|
---|
| 1274 | <info> An arbitrary pointer passed to <<get_variable>>.
|
---|
| 1275 | <devname> Device name; specifically, this is the string that contains all
|
---|
| 1276 | of the regular subexpressions.
|
---|
| 1277 | <ex> Array of start / end offsets into info->devname for each subexpression
|
---|
| 1278 | <numexp> Number of regular subexpressions found in <<devname>>.
|
---|
| 1279 | [RETURNS] TRUE on success, else FALSE.
|
---|
| 1280 | */
|
---|
| 1281 | {
|
---|
| 1282 | char temp[STRING_LENGTH];
|
---|
| 1283 |
|
---|
[1765] | 1284 | if (!st_expr_expand(temp, STRING_LENGTH, input, get_variable_func, info))
|
---|
| 1285 | return FALSE;
|
---|
| 1286 | expand_regexp(output, outsize, temp, devname, ex, numexp);
|
---|
| 1287 | return TRUE;
|
---|
[821] | 1288 | } /* End Function expand_expression */
|
---|
| 1289 |
|
---|
[1765] | 1290 | static void expand_regexp(char *output, size_t outsize, const char *input,
|
---|
[3232] | 1291 | const char *devname,
|
---|
| 1292 | const regmatch_t *ex, unsigned int numex)
|
---|
[821] | 1293 | /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
|
---|
| 1294 | <output> The output expanded expression is written here.
|
---|
| 1295 | <outsize> The size of the output buffer.
|
---|
| 1296 | <input> The input expression. This may NOT equal <<output>>, because
|
---|
| 1297 | supporting that would require yet another string-copy. However, it's not
|
---|
| 1298 | hard to write a simple wrapper function to add this functionality for those
|
---|
| 1299 | few cases that need it.
|
---|
| 1300 | <devname> Device name; specifically, this is the string that contains all
|
---|
| 1301 | of the regular subexpressions.
|
---|
| 1302 | <ex> An array of start and end offsets into <<devname>>, one for each
|
---|
| 1303 | subexpression
|
---|
| 1304 | <numex> Number of subexpressions in the offset-array <<ex>>.
|
---|
| 1305 | [RETURNS] Nothing.
|
---|
| 1306 | */
|
---|
| 1307 | {
|
---|
| 1308 | const char last_exp = '0' - 1 + numex;
|
---|
| 1309 | int c = -1;
|
---|
| 1310 |
|
---|
| 1311 | /* Guarantee NULL termination by writing an explicit '\0' character into
|
---|
| 1312 | the very last byte */
|
---|
| 1313 | if (outsize)
|
---|
| 1314 | output[--outsize] = '\0';
|
---|
| 1315 | /* Copy the input string into the output buffer, replacing '\\' with '\'
|
---|
| 1316 | and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
|
---|
| 1317 | codes are deleted */
|
---|
[1765] | 1318 | while ((c != '\0') && (outsize != 0)) {
|
---|
[821] | 1319 | c = *input;
|
---|
| 1320 | ++input;
|
---|
[1765] | 1321 | if (c == '\\') {
|
---|
[821] | 1322 | c = *input;
|
---|
| 1323 | ++input;
|
---|
[1765] | 1324 | if (c != '\\') {
|
---|
| 1325 | if ((c >= '0') && (c <= last_exp)) {
|
---|
[821] | 1326 | const regmatch_t *subexp = ex + (c - '0');
|
---|
| 1327 | unsigned int sublen = subexp->rm_eo - subexp->rm_so;
|
---|
| 1328 |
|
---|
| 1329 | /* Range checking */
|
---|
| 1330 | if (sublen > outsize)
|
---|
| 1331 | sublen = outsize;
|
---|
[1765] | 1332 | strncpy(output, devname + subexp->rm_so, sublen);
|
---|
[821] | 1333 | output += sublen;
|
---|
| 1334 | outsize -= sublen;
|
---|
| 1335 | }
|
---|
| 1336 | continue;
|
---|
| 1337 | }
|
---|
| 1338 | }
|
---|
| 1339 | *output = c;
|
---|
| 1340 | ++output;
|
---|
| 1341 | --outsize;
|
---|
| 1342 | } /* while */
|
---|
| 1343 | } /* End Function expand_regexp */
|
---|
| 1344 |
|
---|
| 1345 |
|
---|
| 1346 | /* from compat_name.c */
|
---|
| 1347 |
|
---|
[2725] | 1348 | struct translate_struct {
|
---|
[1765] | 1349 | const char *match; /* The string to match to(up to length) */
|
---|
| 1350 | const char *format; /* Format of output, "%s" takes data past match string,
|
---|
| 1351 | NULL is effectively "%s"(just more efficient) */
|
---|
[821] | 1352 | };
|
---|
| 1353 |
|
---|
| 1354 | static struct translate_struct translate_table[] =
|
---|
| 1355 | {
|
---|
| 1356 | {"sound/", NULL},
|
---|
| 1357 | {"printers/", "lp%s"},
|
---|
| 1358 | {"v4l/", NULL},
|
---|
| 1359 | {"parports/", "parport%s"},
|
---|
| 1360 | {"fb/", "fb%s"},
|
---|
| 1361 | {"netlink/", NULL},
|
---|
| 1362 | {"loop/", "loop%s"},
|
---|
| 1363 | {"floppy/", "fd%s"},
|
---|
| 1364 | {"rd/", "ram%s"},
|
---|
| 1365 | {"md/", "md%s"}, /* Meta-devices */
|
---|
| 1366 | {"vc/", "tty%s"},
|
---|
| 1367 | {"misc/", NULL},
|
---|
| 1368 | {"isdn/", NULL},
|
---|
| 1369 | {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
|
---|
| 1370 | {"i2c/", "i2c-%s"},
|
---|
| 1371 | {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
|
---|
| 1372 | {"tts/E", "ttyE%s"}, /* Stallion serial driver */
|
---|
| 1373 | {"cua/E", "cue%s"}, /* Stallion serial driver callout */
|
---|
| 1374 | {"tts/R", "ttyR%s"}, /* Rocketport serial driver */
|
---|
| 1375 | {"cua/R", "cur%s"}, /* Rocketport serial driver callout */
|
---|
| 1376 | {"ip2/", "ip2%s"}, /* Computone serial driver control */
|
---|
| 1377 | {"tts/F", "ttyF%s"}, /* Computone serial driver */
|
---|
| 1378 | {"cua/F", "cuf%s"}, /* Computone serial driver callout */
|
---|
| 1379 | {"tts/C", "ttyC%s"}, /* Cyclades serial driver */
|
---|
| 1380 | {"cua/C", "cub%s"}, /* Cyclades serial driver callout */
|
---|
| 1381 | {"tts/", "ttyS%s"}, /* Generic serial: must be after others */
|
---|
| 1382 | {"cua/", "cua%s"}, /* Generic serial: must be after others */
|
---|
| 1383 | {"input/js", "js%s"}, /* Joystick driver */
|
---|
| 1384 | {NULL, NULL}
|
---|
| 1385 | };
|
---|
| 1386 |
|
---|
[1765] | 1387 | const char *get_old_name(const char *devname, unsigned int namelen,
|
---|
[3232] | 1388 | char *buffer, unsigned int major, unsigned int minor)
|
---|
[821] | 1389 | /* [SUMMARY] Translate a kernel-supplied name into an old name.
|
---|
| 1390 | <devname> The device name provided by the kernel.
|
---|
| 1391 | <namelen> The length of the name.
|
---|
| 1392 | <buffer> A buffer that may be used. This should be at least 128 bytes long.
|
---|
| 1393 | <major> The major number for the device.
|
---|
| 1394 | <minor> The minor number for the device.
|
---|
| 1395 | [RETURNS] A pointer to the old name if known, else NULL.
|
---|
| 1396 | */
|
---|
| 1397 | {
|
---|
| 1398 | const char *compat_name = NULL;
|
---|
[1765] | 1399 | const char *ptr;
|
---|
[821] | 1400 | struct translate_struct *trans;
|
---|
| 1401 | unsigned int i;
|
---|
| 1402 | char mode;
|
---|
| 1403 | int indexx;
|
---|
| 1404 | const char *pty1;
|
---|
| 1405 | const char *pty2;
|
---|
| 1406 | size_t len;
|
---|
| 1407 | /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */
|
---|
| 1408 | static const char *const fmt[] = {
|
---|
| 1409 | NULL ,
|
---|
| 1410 | "sg%u", /* scsi/generic */
|
---|
| 1411 | NULL, /* scsi/disc */
|
---|
| 1412 | "sr%u", /* scsi/cd */
|
---|
| 1413 | NULL, /* scsi/part */
|
---|
| 1414 | "nst%u%c", /* scsi/mt */
|
---|
| 1415 | "hd%c" , /* ide/host/disc */
|
---|
| 1416 | "hd%c" , /* ide/host/cd */
|
---|
| 1417 | "hd%c%s", /* ide/host/part */
|
---|
| 1418 | "%sht%d", /* ide/host/mt */
|
---|
| 1419 | "sbpcd%u", /* sbp/ */
|
---|
| 1420 | "vcs%s", /* vcc/ */
|
---|
| 1421 | "%cty%c%c", /* pty/ */
|
---|
| 1422 | NULL
|
---|
| 1423 | };
|
---|
| 1424 |
|
---|
[1765] | 1425 | for (trans = translate_table; trans->match != NULL; ++trans) {
|
---|
[3232] | 1426 | len = strlen(trans->match);
|
---|
[821] | 1427 |
|
---|
[1765] | 1428 | if (strncmp(devname, trans->match, len) == 0) {
|
---|
[821] | 1429 | if (trans->format == NULL)
|
---|
[1765] | 1430 | return devname + len;
|
---|
| 1431 | sprintf(buffer, trans->format, devname + len);
|
---|
| 1432 | return buffer;
|
---|
[821] | 1433 | }
|
---|
| 1434 | }
|
---|
| 1435 |
|
---|
[1765] | 1436 | ptr = bb_basename(devname);
|
---|
[821] | 1437 | i = scan_dev_name(devname, namelen, ptr);
|
---|
| 1438 |
|
---|
[1765] | 1439 | if (i > 0 && i < 13)
|
---|
[821] | 1440 | compat_name = buffer;
|
---|
| 1441 | else
|
---|
| 1442 | return NULL;
|
---|
| 1443 |
|
---|
| 1444 | /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */
|
---|
[1765] | 1445 | if (i == 1 || i == 3 || i == 10)
|
---|
| 1446 | sprintf(buffer, fmt[i], minor);
|
---|
[821] | 1447 |
|
---|
| 1448 | /* 2 ==scsi/disc, 4 == scsi/part */
|
---|
[1765] | 1449 | if (i == 2 || i == 4)
|
---|
[2725] | 1450 | compat_name = write_old_sd_name(buffer, major, minor, ((i == 2) ? "" : (ptr + 4)));
|
---|
[821] | 1451 |
|
---|
| 1452 | /* 5 == scsi/mt */
|
---|
[1765] | 1453 | if (i == 5) {
|
---|
[821] | 1454 | mode = ptr[2];
|
---|
| 1455 | if (mode == 'n')
|
---|
| 1456 | mode = '\0';
|
---|
[1765] | 1457 | sprintf(buffer, fmt[i], minor & 0x1f, mode);
|
---|
[821] | 1458 | if (devname[namelen - 1] != 'n')
|
---|
| 1459 | ++compat_name;
|
---|
| 1460 | }
|
---|
| 1461 | /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */
|
---|
[1765] | 1462 | if (i == 6 || i == 7 || i == 8)
|
---|
[821] | 1463 | /* last arg should be ignored for i == 6 or i== 7 */
|
---|
[1765] | 1464 | sprintf(buffer, fmt[i] , get_old_ide_name(major, minor), ptr + 4);
|
---|
[821] | 1465 |
|
---|
| 1466 | /* 9 == ide/host/mt */
|
---|
[1765] | 1467 | if (i == 9)
|
---|
| 1468 | sprintf(buffer, fmt[i], ptr + 2, minor & 0x7f);
|
---|
[821] | 1469 |
|
---|
| 1470 | /* 11 == vcc/ */
|
---|
[1765] | 1471 | if (i == 11) {
|
---|
| 1472 | sprintf(buffer, fmt[i], devname + 4);
|
---|
[821] | 1473 | if (buffer[3] == '0')
|
---|
| 1474 | buffer[3] = '\0';
|
---|
| 1475 | }
|
---|
| 1476 | /* 12 == pty/ */
|
---|
[1765] | 1477 | if (i == 12) {
|
---|
[821] | 1478 | pty1 = "pqrstuvwxyzabcde";
|
---|
| 1479 | pty2 = "0123456789abcdef";
|
---|
[1765] | 1480 | indexx = atoi(devname + 5);
|
---|
| 1481 | sprintf(buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
|
---|
[821] | 1482 | }
|
---|
[1765] | 1483 | return compat_name;
|
---|
[821] | 1484 | } /* End Function get_old_name */
|
---|
| 1485 |
|
---|
[1765] | 1486 | static char get_old_ide_name(unsigned int major, unsigned int minor)
|
---|
[821] | 1487 | /* [SUMMARY] Get the old IDE name for a device.
|
---|
| 1488 | <major> The major number for the device.
|
---|
| 1489 | <minor> The minor number for the device.
|
---|
| 1490 | [RETURNS] The drive letter.
|
---|
| 1491 | */
|
---|
| 1492 | {
|
---|
[1765] | 1493 | char letter = 'y'; /* 121 */
|
---|
| 1494 | char c = 'a'; /* 97 */
|
---|
| 1495 | int i = IDE0_MAJOR;
|
---|
[821] | 1496 |
|
---|
| 1497 | /* I hope it works like the previous code as it saves a few bytes. Tito ;P */
|
---|
| 1498 | do {
|
---|
[1765] | 1499 | if (i == IDE0_MAJOR || i == IDE1_MAJOR || i == IDE2_MAJOR
|
---|
| 1500 | || i == IDE3_MAJOR || i == IDE4_MAJOR || i == IDE5_MAJOR
|
---|
| 1501 | || i == IDE6_MAJOR || i == IDE7_MAJOR || i == IDE8_MAJOR
|
---|
| 1502 | || i == IDE9_MAJOR
|
---|
| 1503 | ) {
|
---|
| 1504 | if ((unsigned int)i == major) {
|
---|
| 1505 | letter = c;
|
---|
[821] | 1506 | break;
|
---|
| 1507 | }
|
---|
[1765] | 1508 | c += 2;
|
---|
[821] | 1509 | }
|
---|
| 1510 | i++;
|
---|
[1765] | 1511 | } while (i <= IDE9_MAJOR);
|
---|
[821] | 1512 |
|
---|
| 1513 | if (minor > 63)
|
---|
| 1514 | ++letter;
|
---|
[1765] | 1515 | return letter;
|
---|
[821] | 1516 | } /* End Function get_old_ide_name */
|
---|
| 1517 |
|
---|
[1765] | 1518 | static char *write_old_sd_name(char *buffer,
|
---|
[821] | 1519 | unsigned int major, unsigned int minor,
|
---|
[1765] | 1520 | const char *part)
|
---|
[821] | 1521 | /* [SUMMARY] Write the old SCSI disc name to a buffer.
|
---|
| 1522 | <buffer> The buffer to write to.
|
---|
| 1523 | <major> The major number for the device.
|
---|
| 1524 | <minor> The minor number for the device.
|
---|
| 1525 | <part> The partition string. Must be "" for a whole-disc entry.
|
---|
| 1526 | [RETURNS] A pointer to the buffer on success, else NULL.
|
---|
| 1527 | */
|
---|
| 1528 | {
|
---|
| 1529 | unsigned int disc_index;
|
---|
| 1530 |
|
---|
[1765] | 1531 | if (major == 8) {
|
---|
| 1532 | sprintf(buffer, "sd%c%s", 'a' + (minor >> 4), part);
|
---|
| 1533 | return buffer;
|
---|
[821] | 1534 | }
|
---|
[1765] | 1535 | if ((major > 64) && (major < 72)) {
|
---|
| 1536 | disc_index = ((major - 64) << 4) +(minor >> 4);
|
---|
[821] | 1537 | if (disc_index < 26)
|
---|
[1765] | 1538 | sprintf(buffer, "sd%c%s", 'a' + disc_index, part);
|
---|
[821] | 1539 | else
|
---|
[1765] | 1540 | sprintf(buffer, "sd%c%c%s", 'a' +(disc_index / 26) - 1, 'a' + disc_index % 26, part);
|
---|
| 1541 | return buffer;
|
---|
[821] | 1542 | }
|
---|
[1765] | 1543 | return NULL;
|
---|
[821] | 1544 | } /* End Function write_old_sd_name */
|
---|
| 1545 |
|
---|
| 1546 |
|
---|
| 1547 | /* expression.c */
|
---|
| 1548 |
|
---|
| 1549 | /*EXPERIMENTAL_FUNCTION*/
|
---|
| 1550 |
|
---|
[1765] | 1551 | int st_expr_expand(char *output, unsigned int length, const char *input,
|
---|
[3232] | 1552 | const char *(*get_variable_func)(const char *variable,
|
---|
| 1553 | void *info),
|
---|
| 1554 | void *info)
|
---|
[821] | 1555 | /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
|
---|
| 1556 | <output> The output expanded expression is written here.
|
---|
| 1557 | <length> The size of the output buffer.
|
---|
| 1558 | <input> The input expression. This may equal <<output>>.
|
---|
| 1559 | <get_variable> A function which will be used to get variable values. If
|
---|
| 1560 | this returns NULL, the environment is searched instead. If this is NULL,
|
---|
| 1561 | only the environment is searched.
|
---|
| 1562 | <info> An arbitrary pointer passed to <<get_variable>>.
|
---|
| 1563 | [RETURNS] TRUE on success, else FALSE.
|
---|
| 1564 | */
|
---|
| 1565 | {
|
---|
| 1566 | char ch;
|
---|
| 1567 | unsigned int len;
|
---|
| 1568 | unsigned int out_pos = 0;
|
---|
| 1569 | const char *env;
|
---|
| 1570 | const char *ptr;
|
---|
| 1571 | struct passwd *pwent;
|
---|
| 1572 | char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
|
---|
| 1573 |
|
---|
| 1574 | if (length > BUFFER_SIZE)
|
---|
| 1575 | length = BUFFER_SIZE;
|
---|
[1765] | 1576 | for (; TRUE; ++input) {
|
---|
| 1577 | switch (ch = *input) {
|
---|
[821] | 1578 | case '$':
|
---|
| 1579 | /* Variable expansion */
|
---|
[1765] | 1580 | input = expand_variable(buffer, length, &out_pos, ++input, get_variable_func, info);
|
---|
[821] | 1581 | if (input == NULL)
|
---|
[1765] | 1582 | return FALSE;
|
---|
[821] | 1583 | break;
|
---|
| 1584 | case '~':
|
---|
| 1585 | /* Home directory expansion */
|
---|
| 1586 | ch = input[1];
|
---|
[1765] | 1587 | if (isspace(ch) ||(ch == '/') ||(ch == '\0')) {
|
---|
[821] | 1588 | /* User's own home directory: leave separator for next time */
|
---|
[2725] | 1589 | env = getenv("HOME");
|
---|
| 1590 | if (env == NULL) {
|
---|
[1765] | 1591 | info_logger(LOG_INFO, bb_msg_variable_not_found, "HOME");
|
---|
| 1592 | return FALSE;
|
---|
[821] | 1593 | }
|
---|
[1765] | 1594 | len = strlen(env);
|
---|
[821] | 1595 | if (len + out_pos >= length)
|
---|
| 1596 | goto st_expr_expand_out;
|
---|
[1765] | 1597 | memcpy(buffer + out_pos, env, len + 1);
|
---|
[821] | 1598 | out_pos += len;
|
---|
| 1599 | continue;
|
---|
| 1600 | }
|
---|
| 1601 | /* Someone else's home directory */
|
---|
[1765] | 1602 | for (ptr = ++input; !isspace(ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
|
---|
| 1603 | /* VOID */;
|
---|
[821] | 1604 | len = ptr - input;
|
---|
| 1605 | if (len >= sizeof tmp)
|
---|
| 1606 | goto st_expr_expand_out;
|
---|
[1765] | 1607 | safe_memcpy(tmp, input, len);
|
---|
[821] | 1608 | input = ptr - 1;
|
---|
[2725] | 1609 | pwent = getpwnam(tmp);
|
---|
| 1610 | if (pwent == NULL) {
|
---|
[1765] | 1611 | info_logger(LOG_INFO, "no pwent for: %s", tmp);
|
---|
| 1612 | return FALSE;
|
---|
[821] | 1613 | }
|
---|
[1765] | 1614 | len = strlen(pwent->pw_dir);
|
---|
[821] | 1615 | if (len + out_pos >= length)
|
---|
| 1616 | goto st_expr_expand_out;
|
---|
[1765] | 1617 | memcpy(buffer + out_pos, pwent->pw_dir, len + 1);
|
---|
[821] | 1618 | out_pos += len;
|
---|
| 1619 | break;
|
---|
| 1620 | case '\0':
|
---|
| 1621 | /* Falltrough */
|
---|
| 1622 | default:
|
---|
| 1623 | if (out_pos >= length)
|
---|
| 1624 | goto st_expr_expand_out;
|
---|
| 1625 | buffer[out_pos++] = ch;
|
---|
[1765] | 1626 | if (ch == '\0') {
|
---|
| 1627 | memcpy(output, buffer, out_pos);
|
---|
| 1628 | return TRUE;
|
---|
[821] | 1629 | }
|
---|
| 1630 | break;
|
---|
| 1631 | /* esac */
|
---|
| 1632 | }
|
---|
| 1633 | }
|
---|
[1765] | 1634 | return FALSE;
|
---|
[821] | 1635 | st_expr_expand_out:
|
---|
[1765] | 1636 | info_logger(LOG_INFO, bb_msg_small_buffer);
|
---|
| 1637 | return FALSE;
|
---|
[821] | 1638 | } /* End Function st_expr_expand */
|
---|
| 1639 |
|
---|
| 1640 |
|
---|
| 1641 | /* Private functions follow */
|
---|
| 1642 |
|
---|
[1765] | 1643 | static const char *expand_variable(char *buffer, unsigned int length,
|
---|
[3232] | 1644 | unsigned int *out_pos, const char *input,
|
---|
| 1645 | const char *(*func)(const char *variable,
|
---|
| 1646 | void *info),
|
---|
| 1647 | void *info)
|
---|
[821] | 1648 | /* [SUMMARY] Expand a variable.
|
---|
| 1649 | <buffer> The buffer to write to.
|
---|
| 1650 | <length> The length of the output buffer.
|
---|
| 1651 | <out_pos> The current output position. This is updated.
|
---|
| 1652 | <input> A pointer to the input character pointer.
|
---|
| 1653 | <func> A function which will be used to get variable values. If this
|
---|
| 1654 | returns NULL, the environment is searched instead. If this is NULL, only
|
---|
| 1655 | the environment is searched.
|
---|
| 1656 | <info> An arbitrary pointer passed to <<func>>.
|
---|
| 1657 | <errfp> Diagnostic messages are written here.
|
---|
| 1658 | [RETURNS] A pointer to the end of this subexpression on success, else NULL.
|
---|
| 1659 | */
|
---|
| 1660 | {
|
---|
| 1661 | char ch;
|
---|
| 1662 | int len;
|
---|
| 1663 | unsigned int open_braces;
|
---|
| 1664 | const char *env, *ptr;
|
---|
| 1665 | char tmp[STRING_LENGTH];
|
---|
| 1666 |
|
---|
| 1667 | ch = input[0];
|
---|
[1765] | 1668 | if (ch == '$') {
|
---|
[821] | 1669 | /* Special case for "$$": PID */
|
---|
[2725] | 1670 | sprintf(tmp, "%d", (int) getpid());
|
---|
[1765] | 1671 | len = strlen(tmp);
|
---|
[821] | 1672 | if (len + *out_pos >= length)
|
---|
| 1673 | goto expand_variable_out;
|
---|
| 1674 |
|
---|
[1765] | 1675 | memcpy(buffer + *out_pos, tmp, len + 1);
|
---|
[821] | 1676 | out_pos += len;
|
---|
[1765] | 1677 | return input;
|
---|
[821] | 1678 | }
|
---|
| 1679 | /* Ordinary variable expansion, possibly in braces */
|
---|
[1765] | 1680 | if (ch != '{') {
|
---|
[821] | 1681 | /* Simple variable expansion */
|
---|
[1765] | 1682 | for (ptr = input; isalnum(ch) || (ch == '_') || (ch == ':'); ch = *++ptr)
|
---|
| 1683 | /* VOID */;
|
---|
[821] | 1684 | len = ptr - input;
|
---|
| 1685 | if ((size_t)len >= sizeof tmp)
|
---|
| 1686 | goto expand_variable_out;
|
---|
| 1687 |
|
---|
[1765] | 1688 | safe_memcpy(tmp, input, len);
|
---|
[821] | 1689 | input = ptr - 1;
|
---|
[2725] | 1690 | env = get_variable_v2(tmp, func, info);
|
---|
| 1691 | if (env == NULL) {
|
---|
[1765] | 1692 | info_logger(LOG_INFO, bb_msg_variable_not_found, tmp);
|
---|
| 1693 | return NULL;
|
---|
[821] | 1694 | }
|
---|
[1765] | 1695 | len = strlen(env);
|
---|
[821] | 1696 | if (len + *out_pos >= length)
|
---|
| 1697 | goto expand_variable_out;
|
---|
| 1698 |
|
---|
[1765] | 1699 | memcpy(buffer + *out_pos, env, len + 1);
|
---|
[821] | 1700 | *out_pos += len;
|
---|
[1765] | 1701 | return input;
|
---|
[821] | 1702 | }
|
---|
| 1703 | /* Variable in braces: check for ':' tricks */
|
---|
| 1704 | ch = *++input;
|
---|
[1765] | 1705 | for (ptr = input; isalnum(ch) || (ch == '_'); ch = *++ptr)
|
---|
[821] | 1706 | /* VOID */;
|
---|
[1765] | 1707 | if (ch == '}') {
|
---|
[821] | 1708 | /* Must be simple variable expansion with "${var}" */
|
---|
| 1709 | len = ptr - input;
|
---|
| 1710 | if ((size_t)len >= sizeof tmp)
|
---|
| 1711 | goto expand_variable_out;
|
---|
| 1712 |
|
---|
[1765] | 1713 | safe_memcpy(tmp, input, len);
|
---|
| 1714 | ptr = expand_variable(buffer, length, out_pos, tmp, func, info);
|
---|
[821] | 1715 | if (ptr == NULL)
|
---|
[1765] | 1716 | return NULL;
|
---|
| 1717 | return input + len;
|
---|
[821] | 1718 | }
|
---|
[1765] | 1719 | if (ch != ':' || ptr[1] != '-') {
|
---|
| 1720 | info_logger(LOG_INFO, "illegal char in var name");
|
---|
| 1721 | return NULL;
|
---|
[821] | 1722 | }
|
---|
| 1723 | /* It's that handy "${var:-word}" expression. Check if var is defined */
|
---|
| 1724 | len = ptr - input;
|
---|
| 1725 | if ((size_t)len >= sizeof tmp)
|
---|
| 1726 | goto expand_variable_out;
|
---|
| 1727 |
|
---|
[1765] | 1728 | safe_memcpy(tmp, input, len);
|
---|
[821] | 1729 | /* Move input pointer to ':' */
|
---|
| 1730 | input = ptr;
|
---|
| 1731 | /* First skip to closing brace, taking note of nested expressions */
|
---|
| 1732 | ptr += 2;
|
---|
| 1733 | ch = ptr[0];
|
---|
[1765] | 1734 | for (open_braces = 1; open_braces > 0; ch = *++ptr) {
|
---|
| 1735 | switch (ch) {
|
---|
[821] | 1736 | case '{':
|
---|
| 1737 | ++open_braces;
|
---|
| 1738 | break;
|
---|
| 1739 | case '}':
|
---|
| 1740 | --open_braces;
|
---|
| 1741 | break;
|
---|
| 1742 | case '\0':
|
---|
[2725] | 1743 | info_logger(LOG_INFO, "\"}\" not found in: %s", input);
|
---|
[1765] | 1744 | return NULL;
|
---|
[821] | 1745 | default:
|
---|
| 1746 | break;
|
---|
| 1747 | }
|
---|
| 1748 | }
|
---|
| 1749 | --ptr;
|
---|
| 1750 | /* At this point ptr should point to closing brace of "${var:-word}" */
|
---|
[2725] | 1751 | env = get_variable_v2(tmp, func, info);
|
---|
| 1752 | if (env != NULL) {
|
---|
[821] | 1753 | /* Found environment variable, so skip the input to the closing brace
|
---|
| 1754 | and return the variable */
|
---|
| 1755 | input = ptr;
|
---|
[1765] | 1756 | len = strlen(env);
|
---|
[821] | 1757 | if (len + *out_pos >= length)
|
---|
| 1758 | goto expand_variable_out;
|
---|
| 1759 |
|
---|
[1765] | 1760 | memcpy(buffer + *out_pos, env, len + 1);
|
---|
[821] | 1761 | *out_pos += len;
|
---|
[1765] | 1762 | return input;
|
---|
[821] | 1763 | }
|
---|
| 1764 | /* Environment variable was not found, so process word. Advance input
|
---|
| 1765 | pointer to start of word in "${var:-word}" */
|
---|
| 1766 | input += 2;
|
---|
| 1767 | len = ptr - input;
|
---|
| 1768 | if ((size_t)len >= sizeof tmp)
|
---|
| 1769 | goto expand_variable_out;
|
---|
| 1770 |
|
---|
[1765] | 1771 | safe_memcpy(tmp, input, len);
|
---|
[821] | 1772 | input = ptr;
|
---|
[1765] | 1773 | if (!st_expr_expand(tmp, STRING_LENGTH, tmp, func, info))
|
---|
| 1774 | return NULL;
|
---|
| 1775 | len = strlen(tmp);
|
---|
[821] | 1776 | if (len + *out_pos >= length)
|
---|
| 1777 | goto expand_variable_out;
|
---|
| 1778 |
|
---|
[1765] | 1779 | memcpy(buffer + *out_pos, tmp, len + 1);
|
---|
[821] | 1780 | *out_pos += len;
|
---|
[1765] | 1781 | return input;
|
---|
[821] | 1782 | expand_variable_out:
|
---|
[1765] | 1783 | info_logger(LOG_INFO, bb_msg_small_buffer);
|
---|
| 1784 | return NULL;
|
---|
[821] | 1785 | } /* End Function expand_variable */
|
---|
| 1786 |
|
---|
| 1787 |
|
---|
[1765] | 1788 | static const char *get_variable_v2(const char *variable,
|
---|
[3232] | 1789 | const char *(*func)(const char *variable, void *info),
|
---|
| 1790 | void *info)
|
---|
[821] | 1791 | /* [SUMMARY] Get a variable from the environment or .
|
---|
| 1792 | <variable> The variable name.
|
---|
| 1793 | <func> A function which will be used to get the variable. If this returns
|
---|
| 1794 | NULL, the environment is searched instead. If this is NULL, only the
|
---|
| 1795 | environment is searched.
|
---|
| 1796 | [RETURNS] The value of the variable on success, else NULL.
|
---|
| 1797 | */
|
---|
| 1798 | {
|
---|
| 1799 | const char *value;
|
---|
| 1800 |
|
---|
[1765] | 1801 | if (func != NULL) {
|
---|
| 1802 | value = (*func)(variable, info);
|
---|
[821] | 1803 | if (value != NULL)
|
---|
[1765] | 1804 | return value;
|
---|
[821] | 1805 | }
|
---|
[1765] | 1806 | return getenv(variable);
|
---|
[821] | 1807 | } /* End Function get_variable */
|
---|
| 1808 |
|
---|
| 1809 | /* END OF CODE */
|
---|