Mercurial > hg > toybox
annotate toys/mdev.c @ 367:b8c8b4827e97
Use fdlength() instead of lseek(SEEK_END).
author | Rob Landley <rob@landley.net> |
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date | Tue, 05 Jan 2010 10:45:16 -0600 |
parents | 6773399539aa |
children | d51be130fda2 |
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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7 * |
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8 * Not in SUSv3. |
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9 |
257 | 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 y |
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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 // mknod in /dev based on a path like "/sys/block/hda/hda1" |
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40 static void make_device(char *path) |
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41 { |
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42 char *device_name, *s, *temp; |
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43 int major, minor, type, len, fd; |
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44 int mode = 0660; |
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45 uid_t uid = 0; |
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46 gid_t gid = 0; |
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47 |
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48 // Try to read major/minor string |
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49 |
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50 temp = strrchr(path, '/'); |
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51 fd = open(path, O_RDONLY); |
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52 *temp=0; |
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53 temp++; |
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54 len = read(fd, temp, 64); |
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55 close(fd); |
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56 if (len<1) return; |
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57 temp[len] = 0; |
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58 |
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59 // Determine device name, type, major and minor |
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60 |
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61 device_name = strrchr(path, '/') + 1; |
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62 type = path[5]=='c' ? S_IFCHR : S_IFBLK; |
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63 major = minor = 0; |
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64 sscanf(temp, "%u:%u", &major, &minor); |
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65 |
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66 // If we have a config file, look up permissions for this device |
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67 |
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68 if (CFG_MDEV_CONF) { |
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69 char *conf, *pos, *end; |
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70 |
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71 // mmap the config file |
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72 if (-1!=(fd = open("/etc/mdev.conf", O_RDONLY))) { |
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73 len = fdlength(fd); |
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74 conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0); |
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75 if (conf) { |
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76 int line = 0; |
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77 |
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78 // Loop through lines in mmaped file |
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79 for (pos = conf; pos-conf<len;) { |
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80 int field; |
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81 char *end2; |
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82 |
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83 line++; |
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84 // find end of this line |
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85 for(end = pos; end-conf<len && *end!='\n'; end++); |
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86 |
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87 // Three fields: regex, uid:gid, mode |
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88 for (field = 3; field; field--) { |
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89 // Skip whitespace |
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90 while (pos<end && isspace(*pos)) pos++; |
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91 if (pos==end || *pos=='#') break; |
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92 for (end2 = pos; |
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93 end2<end && !isspace(*end2) && *end2!='#'; end2++); |
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94 switch(field) { |
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95 // Regex to match this device |
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96 case 3: |
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97 { |
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98 char *regex = strndupa(pos, end2-pos); |
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99 regex_t match; |
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100 regmatch_t off; |
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101 int result; |
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102 |
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103 // Is this it? |
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104 xregcomp(&match, regex, REG_EXTENDED); |
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105 result=regexec(&match, device_name, 1, &off, 0); |
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106 regfree(&match); |
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107 |
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108 // If not this device, skip rest of line |
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109 if (result || off.rm_so |
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110 || off.rm_eo!=strlen(device_name)) |
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111 goto end_line; |
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112 |
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113 break; |
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114 } |
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115 // uid:gid |
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116 case 2: |
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117 { |
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118 char *s2; |
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119 |
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120 // Find : |
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121 for(s = pos; s<end2 && *s!=':'; s++); |
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122 if (s==end2) goto end_line; |
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123 |
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124 // Parse UID |
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125 uid = strtoul(pos,&s2,10); |
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126 if (s!=s2) { |
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127 struct passwd *pass; |
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128 pass = getpwnam(strndupa(pos, s-pos)); |
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129 if (!pass) goto end_line; |
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130 uid = pass->pw_uid; |
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131 } |
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132 s++; |
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133 // parse GID |
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134 gid = strtoul(s,&s2,10); |
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135 if (end2!=s2) { |
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136 struct group *grp; |
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137 grp = getgrnam(strndupa(s, end2-s)); |
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138 if (!grp) goto end_line; |
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139 gid = grp->gr_gid; |
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140 } |
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141 break; |
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142 } |
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143 // mode |
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144 case 1: |
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145 { |
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146 mode = strtoul(pos, &pos, 8); |
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147 if (pos!=end2) goto end_line; |
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148 goto found_device; |
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149 } |
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150 } |
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151 pos=end2; |
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152 } |
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153 end_line: |
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154 // Did everything parse happily? |
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155 if (field && field!=3) error_exit("Bad line %d", line); |
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156 |
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157 // Next line |
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158 pos = ++end; |
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159 } |
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160 found_device: |
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161 munmap(conf, len); |
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162 } |
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163 close(fd); |
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164 } |
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165 } |
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166 |
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167 sprintf(temp, "/dev/%s", device_name); |
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168 if (mknod(temp, mode | type, makedev(major, minor)) && errno != EEXIST) |
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169 perror_exit("mknod %s failed", temp); |
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170 |
329
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171 // Dear gcc: shut up about ignoring the return value here. If it doesn't |
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172 // work, what exactly are we supposed to do about it? |
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173 if (CFG_MDEV_CONF) mode=chown(temp, uid, gid); |
114
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174 } |
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175 |
292
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176 static int callback(char *path, struct dirtree *node) |
114
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177 { |
292
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178 // Entries in /sys/class/block aren't char devices, so skip 'em. (We'll |
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179 // get block devices out of /sys/block.) |
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180 if(!strcmp(node->name, "block")) return 1; |
156
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181 |
292
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182 // Does this directory have a "dev" entry in it? |
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183 if (S_ISDIR(node->st.st_mode) || S_ISLNK(node->st.st_mode)) { |
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184 char *dest = path+strlen(path); |
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185 strcpy(dest, "/dev"); |
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186 if (!access(path, R_OK)) make_device(path); |
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187 *dest = 0; |
114
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188 } |
156
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189 |
292
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190 // Circa 2.6.25 the entries more than 2 deep are all either redundant |
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191 // (mouse#, event#) or unnamed (every usb_* entry is called "device"). |
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192 return node->depth>1; |
114
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193 } |
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194 |
254
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233
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195 void mdev_main(void) |
114
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196 { |
292
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197 // Handle -s |
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198 |
114
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199 if (toys.optflags) { |
292
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200 xchdir("/sys/class"); |
114
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201 strcpy(toybuf, "/sys/class"); |
292
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202 dirtree_read(toybuf, NULL, callback); |
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203 strcpy(toybuf+5, "block"); |
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204 dirtree_read(toybuf, NULL, callback); |
156
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205 } |
292
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206 // if (toys.optflags) { |
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207 // strcpy(toybuf, "/sys/block"); |
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208 // find_dev(toybuf); |
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209 // strcpy(toybuf, "/sys/class"); |
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210 // find_dev(toybuf); |
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211 // return; |
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212 // } |
156
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213 |
114
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214 // hotplug support goes here |
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215 } |