mkdev.c

  1 /*
  2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
  3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU Lesser General Public License version 2.1
  7  * as published by the Free Software Foundation
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  */
 14 
 15 #define _DEFAULT_SOURCE
 16 
 17 #include <sys/stat.h>
 18 #include <sys/types.h>
 19 #include <sys/sysmacros.h>
 20 
 21 #include <stdio.h>
 22 #include <string.h>
 23 #include <stdlib.h>
 24 #include <unistd.h>
 25 #include <stdbool.h>
 26 #include <dirent.h>
 27 #include <limits.h>
 28 #include <fnmatch.h>
 29 
 30 #include "init.h"
 31 
 32 static char **patterns;
 33 static int n_patterns;
 34 static char buf[PATH_MAX];
 35 static char buf2[PATH_MAX];
 36 static unsigned int mode = 0600;
 37 
 38 static bool find_pattern(const char *name)
 39 {
 40         int i;
 41 
 42         for (i = 0; i < n_patterns; i++)
 43                 if (!fnmatch(patterns[i], name, 0))
 44                         return true;
 45 
 46         return false;
 47 }
 48 
 49 static void make_dev(const char *path, bool block, int major, int minor)
 50 {
 51         unsigned int oldumask = umask(0);
 52         unsigned int _mode = mode | (block ? S_IFBLK : S_IFCHR);
 53 
 54         DEBUG(4, "Creating %s device %s(%d,%d)\n",
 55                 block ? "block" : "character",
 56                 path, major, minor);
 57 
 58         mknod(path, _mode, makedev(major, minor));
 59         umask(oldumask);
 60 }
 61 
 62 static void find_devs(bool block)
 63 {
 64         char *path = block ? "/sys/dev/block" : "/sys/dev/char";
 65         struct dirent *dp;
 66         DIR *dir;
 67 
 68         dir = opendir(path);
 69         if (!dir)
 70                 return;
 71 
 72         path = buf2 + sprintf(buf2, "%s/", path);
 73         while ((dp = readdir(dir)) != NULL) {
 74                 char *c;
 75                 int major = 0, minor = 0;
 76                 int len;
 77 
 78                 if (dp->d_type != DT_LNK)
 79                         continue;
 80 
 81                 if (sscanf(dp->d_name, "%d:%d", &major, &minor) != 2)
 82                         continue;
 83 
 84                 strcpy(path, dp->d_name);
 85                 len = readlink(buf2, buf, sizeof(buf) - 1);
 86                 if (len <= 0)
 87                         continue;
 88 
 89                 buf[len] = 0;
 90                 if (!find_pattern(buf))
 91                         continue;
 92 
 93                 c = strrchr(buf, '/');
 94                 if (!c)
 95                         continue;
 96 
 97                 c++;
 98                 make_dev(c, block, major, minor);
 99         }
100         closedir(dir);
101 }
102 
103 static char *add_pattern(const char *name)
104 {
105         char *str = malloc(strlen(name) + 2);
106 
107         str[0] = '*';
108         strcpy(str + 1, name);
109         return str;
110 }
111 
112 int mkdev(const char *name, int _mode)
113 {
114         char *pattern;
115 
116         if (chdir("/dev"))
117                 return 1;
118 
119         pattern = add_pattern(name);
120         patterns = &pattern;
121         mode = _mode;
122         n_patterns = 1;
123         find_devs(true);
124         find_devs(false);
125         free(pattern);
126         return chdir("/");
127 }
128
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Sources/procd/initd/mkdev.c
