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annotate toys/pending/mdev.c @ 1104:e11684e3bbc5 draft

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Merge toynet.h into toys.h: musl supports it and micromanaging uClibc config options isn't very interesting anymore.
author Rob Landley <rob@landley.net>
date Sat, 02 Nov 2013 14:24:33 -0500
parents c4284bb4016c
children 63db77909fc8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* mdev.c - Populate /dev directory and handle hotplug events
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2 *
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3 * Copyright 2005, 2008 Rob Landley <rob@landley.net>
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4 * Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
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5
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951110c37fee Add TOYFLAG_UMASK.
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6 USE_MDEV(NEWTOY(mdev, "s", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_UMASK))
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7
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8 config MDEV
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9 bool "mdev"
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10 default n
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11 help
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12 usage: mdev [-s]
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14 Create devices in /dev using information from /sys.
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16 -s Scan all entries in /sys to populate /dev.
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18 config MDEV_CONF
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19 bool "Configuration file for mdev"
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20 default y
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21 depends on MDEV
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22 help
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23 The mdev config file (/etc/mdev.conf) contains lines that look like:
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24 hd[a-z][0-9]* 0:3 660
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26 Each line must contain three whitespace separated fields. The first
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27 field is a regular expression matching one or more device names, and
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28 the second and third fields are uid:gid and file permissions for
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29 matching devies.
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30 */
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31
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32 #include "toys.h"
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33 #include "lib/xregcomp.h"
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34
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35 // todo, open() block devices to trigger partition scanning.
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36
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37 // mknod in /dev based on a path like "/sys/block/hda/hda1"
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38 static void make_device(char *path)
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39 {
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40 char *device_name, *s, *temp;
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41 int major, minor, type, len, fd;
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42 int mode = 0660;
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43 uid_t uid = 0;
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44 gid_t gid = 0;
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46 // Try to read major/minor string
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48 temp = strrchr(path, '/');
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49 fd = open(path, O_RDONLY);
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50 *temp=0;
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51 temp = toybuf;
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52 len = read(fd, temp, 64);
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53 close(fd);
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54 if (len<1) return;
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55 temp[len] = 0;
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57 // Determine device name, type, major and minor
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59 device_name = strrchr(path, '/') + 1;
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60 type = path[5]=='c' ? S_IFCHR : S_IFBLK;
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61 major = minor = 0;
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62 sscanf(temp, "%u:%u", &major, &minor);
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64 // If we have a config file, look up permissions for this device
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66 if (CFG_MDEV_CONF) {
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67 char *conf, *pos, *end;
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69 // mmap the config file
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70 if (-1!=(fd = open("/etc/mdev.conf", O_RDONLY))) {
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71 len = fdlength(fd);
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72 conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
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73 if (conf) {
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74 int line = 0;
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76 // Loop through lines in mmaped file
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77 for (pos = conf; pos-conf<len;) {
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78 int field;
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79 char *end2;
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81 line++;
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82 // find end of this line
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83 for(end = pos; end-conf<len && *end!='\n'; end++);
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85 // Three fields: regex, uid:gid, mode
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86 for (field = 3; field; field--) {
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87 // Skip whitespace
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88 while (pos<end && isspace(*pos)) pos++;
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89 if (pos==end || *pos=='#') break;
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90 for (end2 = pos;
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91 end2<end && !isspace(*end2) && *end2!='#'; end2++);
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92 switch(field) {
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93 // Regex to match this device
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94 case 3:
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95 {
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96 char *regex = strndup(pos, end2-pos);
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97 regex_t match;
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98 regmatch_t off;
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99 int result;
114
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100
694
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101 // Is this it?
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102 xregcomp(&match, regex, REG_EXTENDED);
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103 result=regexec(&match, device_name, 1, &off, 0);
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104 regfree(&match);
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105 free(regex);
156
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106
694
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107 // If not this device, skip rest of line
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108 if (result || off.rm_so
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109 || off.rm_eo!=strlen(device_name))
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110 goto end_line;
114
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111
694
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112 break;
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113 }
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114 // uid:gid
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115 case 2:
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116 {
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117 char *s2;
114
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118
694
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119 // Find :
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120 for(s = pos; s<end2 && *s!=':'; s++);
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121 if (s==end2) goto end_line;
114
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122
694
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123 // Parse UID
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124 uid = strtoul(pos,&s2,10);
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125 if (s!=s2) {
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126 struct passwd *pass;
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127 char *str = strndup(pos, s-pos);
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128 pass = getpwnam(str);
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129 free(str);
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130 if (!pass) goto end_line;
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131 uid = pass->pw_uid;
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132 }
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133 s++;
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134 // parse GID
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135 gid = strtoul(s,&s2,10);
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136 if (end2!=s2) {
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137 struct group *grp;
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138 char *str = strndup(s, end2-s);
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139 grp = getgrnam(str);
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140 free(str);
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141 if (!grp) goto end_line;
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142 gid = grp->gr_gid;
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143 }
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144 break;
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145 }
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146 // mode
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147 case 1:
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148 {
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149 mode = strtoul(pos, &pos, 8);
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150 if (pos!=end2) goto end_line;
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151 goto found_device;
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152 }
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153 }
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154 pos=end2;
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155 }
114
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156 end_line:
694
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157 // Did everything parse happily?
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158 if (field && field!=3) error_exit("Bad line %d", line);
114
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159
694
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160 // Next line
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161 pos = ++end;
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162 }
114
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163 found_device:
694
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164 munmap(conf, len);
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165 }
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166 close(fd);
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167 }
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168 }
114
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169
694
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170 sprintf(temp, "/dev/%s", device_name);
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171 if (mknod(temp, mode | type, makedev(major, minor)) && errno != EEXIST)
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172 perror_exit("mknod %s failed", temp);
114
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173
694
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174 if (CFG_MDEV_CONF) mode=chown(temp, uid, gid);
114
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175 }
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176
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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177 static int callback(struct dirtree *node)
114
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178 {
694
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179 // Entries in /sys/class/block aren't char devices, so skip 'em. (We'll
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180 // get block devices out of /sys/block.)
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181 if(!strcmp(node->name, "block")) return 0;
156
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182
694
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183 // Does this directory have a "dev" entry in it?
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184 // This is path based because the hotplug callbacks are
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185 if (S_ISDIR(node->st.st_mode) || S_ISLNK(node->st.st_mode)) {
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186 int len=4;
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187 char *dev = dirtree_path(node, &len);
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188 strcpy(dev+len, "/dev");
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189 if (!access(dev, R_OK)) make_device(dev);
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190 free(dev);
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191 }
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192
694
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193 // Circa 2.6.25 the entries more than 2 deep are all either redundant
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194 // (mouse#, event#) or unnamed (every usb_* entry is called "device").
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195
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196 return (node->parent && node->parent->parent) ? 0 : DIRTREE_RECURSE;
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197 }
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198
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199 void mdev_main(void)
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200 {
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201 // Handle -s
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202
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203 if (toys.optflags) {
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204 dirtree_read("/sys/class", callback);
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205 dirtree_read("/sys/block", callback);
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206 }
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207
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208 // hotplug support goes here
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209 }