-/*
- * libudev - interface to udev device information
- *
- * Copyright (C) 2008-2011 Kay Sievers <kay.sievers@vrfy.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- */
+/***
+ This file is part of systemd.
+
+ Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/param.h>
+#include "device-nodes.h"
#include "libudev.h"
#include "libudev-private.h"
+#include "utf8.h"
+#include "MurmurHash2.h"
/**
* SECTION:libudev-util
* Utilities useful when dealing with devices and device node names.
*/
-int util_delete_path(struct udev *udev, const char *path)
-{
- char p[UTIL_PATH_SIZE];
- char *pos;
- int err = 0;
-
- if (path[0] == '/')
- while(path[1] == '/')
- path++;
- util_strscpy(p, sizeof(p), path);
- pos = strrchr(p, '/');
- if (pos == p || pos == NULL)
- return 0;
-
- for (;;) {
- *pos = '\0';
- pos = strrchr(p, '/');
-
- /* don't remove the last one */
- if ((pos == p) || (pos == NULL))
- break;
-
- err = rmdir(p);
- if (err < 0) {
- if (errno == ENOENT)
- err = 0;
- break;
- }
- }
- return err;
-}
-
-uid_t util_lookup_user(struct udev *udev, const char *user)
-{
- char *endptr;
- struct passwd pwbuf;
- struct passwd *pw;
- uid_t uid;
- size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
- char *buf = alloca(buflen);
-
- if (strcmp(user, "root") == 0)
- return 0;
- uid = strtoul(user, &endptr, 10);
- if (endptr[0] == '\0')
- return uid;
-
- errno = getpwnam_r(user, &pwbuf, buf, buflen, &pw);
- if (pw != NULL)
- return pw->pw_uid;
- if (errno == 0 || errno == ENOENT || errno == ESRCH)
- udev_err(udev, "specified user '%s' unknown\n", user);
- else
- udev_err(udev, "error resolving user '%s': %m\n", user);
- return 0;
-}
-
-gid_t util_lookup_group(struct udev *udev, const char *group)
-{
- char *endptr;
- struct group grbuf;
- struct group *gr;
- gid_t gid = 0;
- size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
- char *buf = NULL;
-
- if (strcmp(group, "root") == 0)
- return 0;
- gid = strtoul(group, &endptr, 10);
- if (endptr[0] == '\0')
- return gid;
- gid = 0;
- for (;;) {
- char *newbuf;
-
- newbuf = realloc(buf, buflen);
- if (!newbuf)
- break;
- buf = newbuf;
- errno = getgrnam_r(group, &grbuf, buf, buflen, &gr);
- if (gr != NULL) {
- gid = gr->gr_gid;
- } else if (errno == ERANGE) {
- buflen *= 2;
- continue;
- } else if (errno == 0 || errno == ENOENT || errno == ESRCH) {
- udev_err(udev, "specified group '%s' unknown\n", group);
- } else {
- udev_err(udev, "error resolving group '%s': %m\n", group);
- }
- break;
- }
- free(buf);
- return gid;
-}
-
/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
int util_resolve_subsys_kernel(struct udev *udev, const char *string,
char *result, size_t maxsize, int read_value)
if (string[0] != '[')
return -1;
- util_strscpy(temp, sizeof(temp), string);
+ strscpy(temp, sizeof(temp), string);
subsys = &temp[1];
val = udev_device_get_sysattr_value(dev, attr);
if (val != NULL)
- util_strscpy(result, maxsize, val);
+ strscpy(result, maxsize, val);
else
result[0] = '\0';
udev_dbg(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
char *s;
s = result;
- l = util_strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL);
+ l = strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL);
if (attr != NULL)
- util_strpcpyl(&s, l, "/", attr, NULL);
+ strpcpyl(&s, l, "/", attr, NULL);
udev_dbg(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
}
udev_device_unref(dev);
return 0;
}
+
ssize_t util_get_sys_core_link_value(struct udev *udev, const char *slink, const char *syspath, char *value, size_t size)
{
char path[UTIL_PATH_SIZE];
ssize_t len;
const char *pos;
- util_strscpyl(path, sizeof(path), syspath, "/", slink, NULL);
+ strscpyl(path, sizeof(path), syspath, "/", slink, NULL);
len = readlink(path, target, sizeof(target));
if (len <= 0 || len == (ssize_t)sizeof(target))
return -1;
if (pos == NULL)
return -1;
pos = &pos[1];
- return util_strscpy(value, size, pos);
+ return strscpy(value, size, pos);
}
int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size)
return -EINVAL;
base[0] = '\0';
}
- if (base == NULL)
- return -EINVAL;
- util_strscpyl(base, size - (base - syspath), "/", &link_target[back * 3], NULL);
+
+ strscpyl(base, size - (base - syspath), "/", &link_target[back * 3], NULL);
return 0;
}
path[--len] = '\0';
}
-/*
- * Concatenates strings. In any case, terminates in _all_ cases with '\0'
- * and moves the @dest pointer forward to the added '\0'. Returns the
- * remaining size, and 0 if the string was truncated.
- */
-size_t util_strpcpy(char **dest, size_t size, const char *src)
-{
- size_t len;
-
- len = strlen(src);
- if (len >= size) {
- if (size > 1)
- *dest = mempcpy(*dest, src, size-1);
- size = 0;
- *dest[0] = '\0';
- } else {
- if (len > 0) {
- *dest = mempcpy(*dest, src, len);
- size -= len;
- }
- *dest[0] = '\0';
- }
- return size;
-}
-
-/* concatenates list of strings, moves dest forward */
-size_t util_strpcpyl(char **dest, size_t size, const char *src, ...)
-{
- va_list va;
-
- va_start(va, src);
- do {
- size = util_strpcpy(dest, size, src);
- src = va_arg(va, char *);
- } while (src != NULL);
- va_end(va);
-
- return size;
-}
-
-/* copies string */
-size_t util_strscpy(char *dest, size_t size, const char *src)
-{
- char *s;
-
- s = dest;
- return util_strpcpy(&s, size, src);
-}
-
-/* concatenates list of strings */
-size_t util_strscpyl(char *dest, size_t size, const char *src, ...)
-{
- va_list va;
- char *s;
-
- va_start(va, src);
- s = dest;
- do {
- size = util_strpcpy(&s, size, src);
- src = va_arg(va, char *);
- } while (src != NULL);
- va_end(va);
-
- return size;
-}
-
-/* count of characters used to encode one unicode char */
-static int utf8_encoded_expected_len(const char *str)
-{
- unsigned char c = (unsigned char)str[0];
-
- if (c < 0x80)
- return 1;
- if ((c & 0xe0) == 0xc0)
- return 2;
- if ((c & 0xf0) == 0xe0)
- return 3;
- if ((c & 0xf8) == 0xf0)
- return 4;
- if ((c & 0xfc) == 0xf8)
- return 5;
- if ((c & 0xfe) == 0xfc)
- return 6;
- return 0;
-}
-
-/* decode one unicode char */
-static int utf8_encoded_to_unichar(const char *str)
-{
- int unichar;
- int len;
- int i;
-
- len = utf8_encoded_expected_len(str);
- switch (len) {
- case 1:
- return (int)str[0];
- case 2:
- unichar = str[0] & 0x1f;
- break;
- case 3:
- unichar = (int)str[0] & 0x0f;
- break;
- case 4:
- unichar = (int)str[0] & 0x07;
- break;
- case 5:
- unichar = (int)str[0] & 0x03;
- break;
- case 6:
- unichar = (int)str[0] & 0x01;
- break;
- default:
- return -1;
- }
-
- for (i = 1; i < len; i++) {
- if (((int)str[i] & 0xc0) != 0x80)
- return -1;
- unichar <<= 6;
- unichar |= (int)str[i] & 0x3f;
- }
-
- return unichar;
-}
-
-/* expected size used to encode one unicode char */
-static int utf8_unichar_to_encoded_len(int unichar)
-{
- if (unichar < 0x80)
- return 1;
- if (unichar < 0x800)
- return 2;
- if (unichar < 0x10000)
- return 3;
- if (unichar < 0x200000)
- return 4;
- if (unichar < 0x4000000)
- return 5;
- return 6;
-}
-
-/* check if unicode char has a valid numeric range */
-static int utf8_unichar_valid_range(int unichar)
-{
- if (unichar > 0x10ffff)
- return 0;
- if ((unichar & 0xfffff800) == 0xd800)
- return 0;
- if ((unichar > 0xfdcf) && (unichar < 0xfdf0))
- return 0;
- if ((unichar & 0xffff) == 0xffff)
- return 0;
- return 1;
-}
-
-/* validate one encoded unicode char and return its length */
-static int utf8_encoded_valid_unichar(const char *str)
-{
- int len;
- int unichar;
- int i;
-
- len = utf8_encoded_expected_len(str);
- if (len == 0)
- return -1;
-
- /* ascii is valid */
- if (len == 1)
- return 1;
-
- /* check if expected encoded chars are available */
- for (i = 0; i < len; i++)
- if ((str[i] & 0x80) != 0x80)
- return -1;
-
- unichar = utf8_encoded_to_unichar(str);
-
- /* check if encoded length matches encoded value */
- if (utf8_unichar_to_encoded_len(unichar) != len)
- return -1;
-
- /* check if value has valid range */
- if (!utf8_unichar_valid_range(unichar))
- return -1;
-
- return len;
-}
-
int util_replace_whitespace(const char *str, char *to, size_t len)
{
size_t i, j;
return 0;
}
-static int is_whitelisted(char c, const char *white)
-{
- if ((c >= '0' && c <= '9') ||
- (c >= 'A' && c <= 'Z') ||
- (c >= 'a' && c <= 'z') ||
- strchr("#+-.:=@_", c) != NULL ||
- (white != NULL && strchr(white, c) != NULL))
- return 1;
- return 0;
-}
-
/* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */
int util_replace_chars(char *str, const char *white)
{
while (str[i] != '\0') {
int len;
- if (is_whitelisted(str[i], white)) {
+ if (whitelisted_char_for_devnode(str[i], white)) {
i++;
continue;
}
**/
_public_ int udev_util_encode_string(const char *str, char *str_enc, size_t len)
{
- size_t i, j;
-
- if (str == NULL || str_enc == NULL)
- return -1;
-
- for (i = 0, j = 0; str[i] != '\0'; i++) {
- int seqlen;
-
- seqlen = utf8_encoded_valid_unichar(&str[i]);
- if (seqlen > 1) {
- if (len-j < (size_t)seqlen)
- goto err;
- memcpy(&str_enc[j], &str[i], seqlen);
- j += seqlen;
- i += (seqlen-1);
- } else if (str[i] == '\\' || !is_whitelisted(str[i], NULL)) {
- if (len-j < 4)
- goto err;
- sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
- j += 4;
- } else {
- if (len-j < 1)
- goto err;
- str_enc[j] = str[i];
- j++;
- }
- }
- if (len-j < 1)
- goto err;
- str_enc[j] = '\0';
- return 0;
-err:
- return -1;
-}
-
-/*
- * http://sites.google.com/site/murmurhash/
- *
- * All code is released to the public domain. For business purposes,
- * Murmurhash is under the MIT license.
- *
- */
-static unsigned int murmur_hash2(const char *key, int len, unsigned int seed)
-{
- /*
- * 'm' and 'r' are mixing constants generated offline.
- * They're not really 'magic', they just happen to work well.
- */
- const unsigned int m = 0x5bd1e995;
- const int r = 24;
-
- /* initialize the hash to a 'random' value */
- unsigned int h = seed ^ len;
-
- /* mix 4 bytes at a time into the hash */
- const unsigned char * data = (const unsigned char *)key;
-
- while(len >= 4) {
- unsigned int k = *(unsigned int *)data;
-
- k *= m;
- k ^= k >> r;
- k *= m;
- h *= m;
- h ^= k;
-
- data += 4;
- len -= 4;
- }
-
- /* handle the last few bytes of the input array */
- switch(len) {
- case 3:
- h ^= data[2] << 16;
- case 2:
- h ^= data[1] << 8;
- case 1:
- h ^= data[0];
- h *= m;
- };
-
- /* do a few final mixes of the hash to ensure the last few bytes are well-incorporated */
- h ^= h >> 13;
- h *= m;
- h ^= h >> 15;
-
- return h;
+ return encode_devnode_name(str, str_enc, len);
}
unsigned int util_string_hash32(const char *str)
{
- return murmur_hash2(str, strlen(str), 0);
+ return MurmurHash2(str, strlen(str), 0);
}
/* get a bunch of bit numbers out of the hash, and set the bits in our bit field */
bits |= 1LLU << ((hash >> 18) & 63);
return bits;
}
-
-ssize_t print_kmsg(const char *fmt, ...)
-{
- int fd;
- va_list ap;
- char text[1024];
- ssize_t len;
- ssize_t ret;
-
- fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- return -errno;
-
- len = snprintf(text, sizeof(text), "<30>systemd-udevd[%u]: ", getpid());
-
- va_start(ap, fmt);
- len += vsnprintf(text + len, sizeof(text) - len, fmt, ap);
- va_end(ap);
-
- ret = write(fd, text, len);
- if (ret < 0)
- ret = -errno;
- close(fd);
- return ret;
-}
~ianmdlvl / elogind.git / blobdiff