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annotate toys/mdev.c @ 543:60b97ba66a70

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Extensive semi-gratuitous refactoring: factor out common code, handle euid!=uid and egid!=gid cases. (Note: test suite requires root access, possibly container support.)
author Rob Landley <rob@landley.net>
date Mon, 12 Mar 2012 23:00:28 -0500
parents d51be130fda2
children 2a757e592ff7
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>
194
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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bf3f98a58ee2 Fix up (admittedly stubby) mdev so it's actually hooked up to the build.
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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 // 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
114
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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
6773399539aa Shut up some new aggressively stupid warnings gcc 4.3 produces.
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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
bf3f98a58ee2 Fix up (admittedly stubby) mdev so it's actually hooked up to the build.
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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);
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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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diff changeset
213
114
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214 // hotplug support goes here
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215 }