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