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annotate toys/mdev.c @ 587:82ffae226c40

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Convert another realpath use to xrealpath().
author Rob Landley <rob@landley.net>
date Fri, 01 Jun 2012 17:59:11 -0500
parents 4877cff01b25
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* vi:set ts=4:
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2 *
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3 * mdev - Mini udev for busybox
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4 *
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5 * Copyright 2005, 2008 Rob Landley <rob@landley.net>
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6 * Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
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30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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7 *
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8 * Not in SUSv3.
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9
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10 USE_MDEV(NEWTOY(mdev, "s", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_UMASK))
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11
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12 config MDEV
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13 bool "mdev"
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14 default n
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15 help
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16 usage: mdev [-s]
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17
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18 Create devices in /dev using information from /sys.
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19
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20 -s Scan all entries in /sys to populate /dev.
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21
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22 config MDEV_CONF
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23 bool "Configuration file for mdev"
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24 default y
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25 depends on MDEV
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26 help
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27 The mdev config file (/etc/mdev.conf) contains lines that look like:
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28 hd[a-z][0-9]* 0:3 660
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29
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30 Each line must contain three whitespace separated fields. The first
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31 field is a regular expression matching one or more device names, and
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32 the second and third fields are uid:gid and file permissions for
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33 matching devies.
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34 */
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35
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36 #include "toys.h"
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37 #include "lib/xregcomp.h"
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38
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39 // todo, open() block devices to trigger partition scanning.
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40
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41 // mknod in /dev based on a path like "/sys/block/hda/hda1"
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42 static void make_device(char *path)
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43 {
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44 char *device_name, *s, *temp;
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45 int major, minor, type, len, fd;
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46 int mode = 0660;
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47 uid_t uid = 0;
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48 gid_t gid = 0;
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49
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50 // Try to read major/minor string
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51
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52 temp = strrchr(path, '/');
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53 fd = open(path, O_RDONLY);
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54 *temp=0;
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55 temp = toybuf;
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56 len = read(fd, temp, 64);
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57 close(fd);
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58 if (len<1) return;
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59 temp[len] = 0;
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60
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61 // Determine device name, type, major and minor
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62
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63 device_name = strrchr(path, '/') + 1;
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64 type = path[5]=='c' ? S_IFCHR : S_IFBLK;
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65 major = minor = 0;
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66 sscanf(temp, "%u:%u", &major, &minor);
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67
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68 // If we have a config file, look up permissions for this device
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69
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70 if (CFG_MDEV_CONF) {
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71 char *conf, *pos, *end;
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72
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73 // mmap the config file
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74 if (-1!=(fd = open("/etc/mdev.conf", O_RDONLY))) {
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75 len = fdlength(fd);
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76 conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
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77 if (conf) {
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78 int line = 0;
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79
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80 // Loop through lines in mmaped file
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81 for (pos = conf; pos-conf<len;) {
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82 int field;
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83 char *end2;
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84
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85 line++;
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86 // find end of this line
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87 for(end = pos; end-conf<len && *end!='\n'; end++);
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88
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89 // Three fields: regex, uid:gid, mode
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90 for (field = 3; field; field--) {
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91 // Skip whitespace
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92 while (pos<end && isspace(*pos)) pos++;
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93 if (pos==end || *pos=='#') break;
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94 for (end2 = pos;
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95 end2<end && !isspace(*end2) && *end2!='#'; end2++);
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96 switch(field) {
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97 // Regex to match this device
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98 case 3:
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99 {
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100 char *regex = strndup(pos, end2-pos);
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101 regex_t match;
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102 regmatch_t off;
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103 int result;
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104
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105 // Is this it?
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106 xregcomp(&match, regex, REG_EXTENDED);
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107 result=regexec(&match, device_name, 1, &off, 0);
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108 regfree(&match);
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109 free(regex);
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110
114
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111 // If not this device, skip rest of line
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112 if (result || off.rm_so
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113 || off.rm_eo!=strlen(device_name))
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114 goto end_line;
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115
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116 break;
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117 }
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118 // uid:gid
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119 case 2:
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120 {
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121 char *s2;
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122
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123 // Find :
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124 for(s = pos; s<end2 && *s!=':'; s++);
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125 if (s==end2) goto end_line;
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126
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127 // Parse UID
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128 uid = strtoul(pos,&s2,10);
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129 if (s!=s2) {
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130 struct passwd *pass;
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131 char *str = strndup(pos, s-pos);
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132 pass = getpwnam(str);
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133 free(str);
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134 if (!pass) goto end_line;
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135 uid = pass->pw_uid;
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136 }
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137 s++;
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138 // parse GID
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139 gid = strtoul(s,&s2,10);
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140 if (end2!=s2) {
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141 struct group *grp;
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142 char *str = strndup(s, end2-s);
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143 grp = getgrnam(str);
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144 free(str);
114
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145 if (!grp) goto end_line;
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146 gid = grp->gr_gid;
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147 }
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148 break;
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149 }
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150 // mode
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151 case 1:
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152 {
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153 mode = strtoul(pos, &pos, 8);
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154 if (pos!=end2) goto end_line;
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155 goto found_device;
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156 }
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157 }
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158 pos=end2;
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159 }
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160 end_line:
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161 // Did everything parse happily?
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162 if (field && field!=3) error_exit("Bad line %d", line);
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163
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164 // Next line
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165 pos = ++end;
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166 }
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167 found_device:
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168 munmap(conf, len);
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169 }
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170 close(fd);
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171 }
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172 }
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173
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174 sprintf(temp, "/dev/%s", device_name);
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175 if (mknod(temp, mode | type, makedev(major, minor)) && errno != EEXIST)
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176 perror_exit("mknod %s failed", temp);
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177
329
6773399539aa Shut up some new aggressively stupid warnings gcc 4.3 produces.
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178 if (CFG_MDEV_CONF) mode=chown(temp, uid, gid);
114
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179 }
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180
577
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181 static int callback(struct dirtree *node)
114
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182 {
292
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183 // Entries in /sys/class/block aren't char devices, so skip 'em. (We'll
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184 // get block devices out of /sys/block.)
580
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185 if(!strcmp(node->name, "block")) return 0;
156
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186
292
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187 // Does this directory have a "dev" entry in it?
577
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188 // This is path based because the hotplug callbacks are
292
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diff changeset
189 if (S_ISDIR(node->st.st_mode) || S_ISLNK(node->st.st_mode)) {
577
2a757e592ff7 Remove strndupa() gnu-ism at Georgi's suggestion, and adjust mdev to compile with new dirtree. (No idea if it works, this command was never finished and needs a lot more work.)
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diff changeset
190 int len=4;
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diff changeset
191 char *dev = dirtree_path(node, &len);
2a757e592ff7 Remove strndupa() gnu-ism at Georgi's suggestion, and adjust mdev to compile with new dirtree. (No idea if it works, this command was never finished and needs a lot more work.)
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192 strcpy(dev+len, "/dev");
2a757e592ff7 Remove strndupa() gnu-ism at Georgi's suggestion, and adjust mdev to compile with new dirtree. (No idea if it works, this command was never finished and needs a lot more work.)
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193 if (!access(dev, R_OK)) make_device(dev);
2a757e592ff7 Remove strndupa() gnu-ism at Georgi's suggestion, and adjust mdev to compile with new dirtree. (No idea if it works, this command was never finished and needs a lot more work.)
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diff changeset
194 free(dev);
114
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195 }
156
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diff changeset
196
292
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197 // Circa 2.6.25 the entries more than 2 deep are all either redundant
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198 // (mouse#, event#) or unnamed (every usb_* entry is called "device").
580
4877cff01b25 dirtree logic cleanup: switch DIRTREE_NORECURSE and DIRTREE_NOSAVE to DIRTREE_RECURSE and DIRTREE_SAVE.
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parents: 577
diff changeset
199
4877cff01b25 dirtree logic cleanup: switch DIRTREE_NORECURSE and DIRTREE_NOSAVE to DIRTREE_RECURSE and DIRTREE_SAVE.
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diff changeset
200 return (node->parent && node->parent->parent) ? 0 : DIRTREE_RECURSE;
114
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parents:
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201 }
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202
254
bf3f98a58ee2 Fix up (admittedly stubby) mdev so it's actually hooked up to the build.
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parents: 233
diff changeset
203 void mdev_main(void)
114
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204 {
292
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diff changeset
205 // Handle -s
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diff changeset
206
114
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207 if (toys.optflags) {
577
2a757e592ff7 Remove strndupa() gnu-ism at Georgi's suggestion, and adjust mdev to compile with new dirtree. (No idea if it works, this command was never finished and needs a lot more work.)
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diff changeset
208 dirtree_read("/sys/class", callback);
2a757e592ff7 Remove strndupa() gnu-ism at Georgi's suggestion, and adjust mdev to compile with new dirtree. (No idea if it works, this command was never finished and needs a lot more work.)
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diff changeset
209 dirtree_read("/sys/block", callback);
156
1e8f4b05cb65 Remove trailing whitespace (thanks to Charlie Shepherd), and a couple comment
Rob Landley <rob@landley.net>
parents: 114
diff changeset
210 }
1e8f4b05cb65 Remove trailing whitespace (thanks to Charlie Shepherd), and a couple comment
Rob Landley <rob@landley.net>
parents: 114
diff changeset
211
114
ce6956dfc0cf Add sync and an incomplete version of mdev.
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parents:
diff changeset
212 // hotplug support goes here
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parents:
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213 }