Mercurial > hg > toybox
annotate toys/mdev.c @ 156:1e8f4b05cb65
Remove trailing whitespace (thanks to Charlie Shepherd), and a couple comment
tweaks.
author | Rob Landley <rob@landley.net> |
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date | Thu, 15 Nov 2007 18:30:30 -0600 |
parents | ce6956dfc0cf |
children | 25447caf1b4b |
rev | line source |
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114
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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 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 |
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9 #include "toys.h" |
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10 #include "lib/xregcomp.h" |
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11 |
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12 // mknod in /dev based on a path like "/sys/block/hda/hda1" |
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13 static void make_device(char *path) |
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14 { |
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15 char *device_name, *s, *temp; |
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16 int major, minor, type, len, fd; |
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17 int mode = 0660; |
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18 uid_t uid = 0; |
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19 gid_t gid = 0; |
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20 |
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21 // Try to read major/minor string |
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22 |
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23 temp = path+strlen(path); |
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24 strcpy(temp, "/dev"); |
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25 fd = open(path, O_RDONLY); |
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26 *temp=0; |
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27 temp++; |
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28 len = read(fd, temp, 64); |
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29 close(fd); |
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30 if (len<1) return; |
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31 temp[len] = 0; |
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32 |
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33 // Determine device name, type, major and minor |
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34 |
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35 device_name = strrchr(path, '/') + 1; |
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36 type = path[5]=='c' ? S_IFCHR : S_IFBLK; |
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37 major = minor = 0; |
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38 sscanf(temp, "%u:%u", &major, &minor); |
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39 |
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40 // If we have a config file, look up permissions for this device |
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41 |
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42 if (CFG_MDEV_CONF) { |
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43 char *conf, *pos, *end; |
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44 |
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45 // mmap the config file |
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46 if (-1!=(fd = open("/etc/mdev.conf", O_RDONLY))) { |
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47 len = lseek(fd, 0, SEEK_END); |
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48 conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0); |
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49 if (conf) { |
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50 int line = 0; |
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51 |
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52 // Loop through lines in mmaped file |
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53 for (pos = conf; pos-conf<len;) { |
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54 int field; |
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55 char *end2; |
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56 |
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57 line++; |
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58 // find end of this line |
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59 for(end = pos; end-conf<len && *end!='\n'; end++); |
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60 |
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61 // Three fields: regex, uid:gid, mode |
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62 for (field = 3; field; field--) { |
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63 // Skip whitespace |
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64 while (pos<end && isspace(*pos)) pos++; |
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65 if (pos==end || *pos=='#') break; |
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66 for (end2 = pos; |
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67 end2<end && !isspace(*end2) && *end2!='#'; end2++); |
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68 switch(field) { |
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69 // Regex to match this device |
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70 case 3: |
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71 { |
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72 char *regex = strndupa(pos, end2-pos); |
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73 regex_t match; |
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74 regmatch_t off; |
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75 int result; |
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76 |
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77 // Is this it? |
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78 xregcomp(&match, regex, REG_EXTENDED); |
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79 result=regexec(&match, device_name, 1, &off, 0); |
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80 regfree(&match); |
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81 |
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82 // If not this device, skip rest of line |
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83 if (result || off.rm_so |
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84 || off.rm_eo!=strlen(device_name)) |
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85 goto end_line; |
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86 |
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87 break; |
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88 } |
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89 // uid:gid |
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90 case 2: |
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91 { |
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92 char *s2; |
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93 |
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94 // Find : |
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95 for(s = pos; s<end2 && *s!=':'; s++); |
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96 if (s==end2) goto end_line; |
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97 |
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98 // Parse UID |
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99 uid = strtoul(pos,&s2,10); |
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100 if (s!=s2) { |
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101 struct passwd *pass; |
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102 pass = getpwnam(strndupa(pos, s-pos)); |
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103 if (!pass) goto end_line; |
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104 uid = pass->pw_uid; |
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105 } |
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106 s++; |
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107 // parse GID |
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108 gid = strtoul(s,&s2,10); |
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109 if (end2!=s2) { |
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110 struct group *grp; |
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111 grp = getgrnam(strndupa(s, end2-s)); |
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112 if (!grp) goto end_line; |
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113 gid = grp->gr_gid; |
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114 } |
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115 break; |
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116 } |
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117 // mode |
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118 case 1: |
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119 { |
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120 mode = strtoul(pos, &pos, 8); |
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121 if (pos!=end2) goto end_line; |
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122 goto found_device; |
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123 } |
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124 } |
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125 pos=end2; |
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126 } |
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127 end_line: |
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128 // Did everything parse happily? |
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129 if (field && field!=3) error_exit("Bad line %d", line); |
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130 |
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131 // Next line |
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132 pos = ++end; |
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133 } |
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134 found_device: |
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135 munmap(conf, len); |
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136 } |
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137 close(fd); |
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138 } |
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139 } |
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140 |
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141 sprintf(temp, "/dev/%s", device_name); |
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142 umask(0); |
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143 if (mknod(temp, mode | type, makedev(major, minor)) && errno != EEXIST) |
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144 perror_exit("mknod %s failed", temp); |
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145 |
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146 if (CFG_MDEV_CONF) chown(temp, uid, gid); |
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147 } |
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148 |
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149 // Recursive search of /sys/block or /sys/class. path must be a writeable |
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150 // buffer of size PATH_MAX containing the directory string to start at. |
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151 |
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152 static void find_dev(char *path) |
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153 { |
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154 DIR *dir; |
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155 int len=strlen(path); |
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156 |
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157 if (!(dir = opendir(path))) |
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158 perror_exit("No %s",path); |
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159 |
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160 for (;;) { |
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161 struct dirent *entry = readdir(dir); |
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162 |
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163 if (!entry) break; |
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164 |
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165 // Skip "." and ".." (also skips hidden files, which is ok) |
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166 |
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167 if (entry->d_name[0]=='.') continue; |
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168 |
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169 if (entry->d_type == DT_DIR) { |
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170 snprintf(path+len, sizeof(toybuf)-len, "/%s", entry->d_name); |
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171 find_dev(path); |
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172 path[len] = 0; |
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173 } |
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174 |
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175 // If there's a dev entry, mknod it |
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176 |
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177 if (strcmp(entry->d_name, "dev")) make_device(path); |
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178 } |
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179 |
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180 closedir(dir); |
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181 } |
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182 |
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183 int mdev_main(int argc, char *argv[]) |
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184 { |
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185 if (toys.optflags) { |
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186 strcpy(toybuf, "/sys/block"); |
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187 find_dev(toybuf); |
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188 strcpy(toybuf, "/sys/class"); |
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189 find_dev(toybuf); |
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190 return 0; |
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191 } |
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192 |
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193 // hotplug support goes here |
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194 |
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195 return 0; |
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196 } |