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/*
* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define _BSD_SOURCE
#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <dirent.h>
#include <limits.h>
#include <fnmatch.h>
#include "init.h"
static char **patterns;
static int n_patterns;
static char buf[PATH_MAX];
static char buf2[PATH_MAX];
static unsigned int mode = 0600;
static bool find_pattern(const char *name)
{
int i;
for (i = 0; i < n_patterns; i++)
if (!fnmatch(patterns[i], name, 0))
return true;
return false;
}
static void make_dev(const char *path, bool block, int major, int minor)
{
unsigned int oldumask = umask(0);
unsigned int _mode = mode | (block ? S_IFBLK : S_IFCHR);
DEBUG(4, "Creating %s device %s(%d,%d)\n",
block ? "block" : "character",
path, major, minor);
mknod(path, _mode, makedev(major, minor));
umask(oldumask);
}
static void find_devs(bool block)
{
char *path = block ? "/sys/dev/block" : "/sys/dev/char";
struct dirent *dp;
DIR *dir;
dir = opendir(path);
if (!dir)
return;
path = buf2 + sprintf(buf2, "%s/", path);
while ((dp = readdir(dir)) != NULL) {
char *c;
int major = 0, minor = 0;
int len;
if (dp->d_type != DT_LNK)
continue;
if (sscanf(dp->d_name, "%d:%d", &major, &minor) != 2)
continue;
strcpy(path, dp->d_name);
len = readlink(buf2, buf, sizeof(buf));
if (len <= 0)
continue;
buf[len] = 0;
if (!find_pattern(buf))
continue;
c = strrchr(buf, '/');
if (!c)
continue;
c++;
make_dev(c, block, major, minor);
}
closedir(dir);
}
static char *add_pattern(const char *name)
{
char *str = malloc(strlen(name) + 2);
str[0] = '*';
strcpy(str + 1, name);
return str;
}
int mkdev(const char *name, int _mode)
{
char *pattern;
if (chdir("/dev"))
return 1;
pattern = add_pattern(name);
patterns = &pattern;
mode = _mode;
n_patterns = 1;
find_devs(true);
find_devs(false);
chdir("/");
return 0;
}
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