/***
This file is part of systemd.
- Copyright 2012 Kay Sievers <kay.sievers@vrfy.org>
- Copyright 2008 Alan Jenkins <alan.christopher.jenkins@googlemail.com>
+ Copyright Tom Gundersen <teg@jklm.no>
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
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <inttypes.h>
-#include <ctype.h>
-#include <stdlib.h>
-#include <fnmatch.h>
-#include <getopt.h>
-#include <sys/mman.h>
-
#include "libudev-private.h"
-#include "libudev-hwdb-def.h"
+#include "sd-hwdb.h"
+#include "hwdb-util.h"
/**
* SECTION:libudev-hwdb
struct udev *udev;
int refcount;
- FILE *f;
- struct stat st;
- union {
- struct trie_header_f *head;
- const char *map;
- };
+ sd_hwdb *hwdb;
struct udev_list properties_list;
};
-struct linebuf {
- char bytes[LINE_MAX];
- size_t size;
- size_t len;
-};
-
-static void linebuf_init(struct linebuf *buf) {
- buf->size = 0;
- buf->len = 0;
-}
-
-static const char *linebuf_get(struct linebuf *buf) {
- if (buf->len + 1 >= sizeof(buf->bytes))
- return NULL;
- buf->bytes[buf->len] = '\0';
- return buf->bytes;
-}
-
-static bool linebuf_add(struct linebuf *buf, const char *s, size_t len) {
- if (buf->len + len >= sizeof(buf->bytes))
- return false;
- memcpy(buf->bytes + buf->len, s, len);
- buf->len += len;
- return true;
-}
-
-static bool linebuf_add_char(struct linebuf *buf, char c)
-{
- if (buf->len + 1 >= sizeof(buf->bytes))
- return false;
- buf->bytes[buf->len++] = c;
- return true;
-}
-
-static void linebuf_rem(struct linebuf *buf, size_t count) {
- assert(buf->len >= count);
- buf->len -= count;
-}
-
-static void linebuf_rem_char(struct linebuf *buf) {
- linebuf_rem(buf, 1);
-}
-
-static const struct trie_child_entry_f *trie_node_children(struct udev_hwdb *hwdb, const struct trie_node_f *node) {
- return (const struct trie_child_entry_f *)((const char *)node + le64toh(hwdb->head->node_size));
-}
-
-static const struct trie_value_entry_f *trie_node_values(struct udev_hwdb *hwdb, const struct trie_node_f *node) {
- const char *base = (const char *)node;
-
- base += le64toh(hwdb->head->node_size);
- base += node->children_count * le64toh(hwdb->head->child_entry_size);
- return (const struct trie_value_entry_f *)base;
-}
-
-static const struct trie_node_f *trie_node_from_off(struct udev_hwdb *hwdb, le64_t off) {
- return (const struct trie_node_f *)(hwdb->map + le64toh(off));
-}
-
-static const char *trie_string(struct udev_hwdb *hwdb, le64_t off) {
- return hwdb->map + le64toh(off);
-}
-
-static int trie_children_cmp_f(const void *v1, const void *v2) {
- const struct trie_child_entry_f *n1 = v1;
- const struct trie_child_entry_f *n2 = v2;
-
- return n1->c - n2->c;
-}
-
-static const struct trie_node_f *node_lookup_f(struct udev_hwdb *hwdb, const struct trie_node_f *node, uint8_t c) {
- struct trie_child_entry_f *child;
- struct trie_child_entry_f search;
-
- search.c = c;
- child = bsearch(&search, trie_node_children(hwdb, node), node->children_count,
- le64toh(hwdb->head->child_entry_size), trie_children_cmp_f);
- if (child)
- return trie_node_from_off(hwdb, child->child_off);
- return NULL;
-}
-
-static int hwdb_add_property(struct udev_hwdb *hwdb, const char *key, const char *value) {
- /* TODO: add sub-matches (+) against DMI data */
- if (key[0] != ' ')
- return 0;
- if (udev_list_entry_add(&hwdb->properties_list, key+1, value) == NULL)
- return -ENOMEM;
- return 0;
-}
-
-static int trie_fnmatch_f(struct udev_hwdb *hwdb, const struct trie_node_f *node, size_t p,
- struct linebuf *buf, const char *search) {
- size_t len;
- size_t i;
- const char *prefix;
- int err;
-
- prefix = trie_string(hwdb, node->prefix_off);
- len = strlen(prefix + p);
- linebuf_add(buf, prefix + p, len);
-
- for (i = 0; i < node->children_count; i++) {
- const struct trie_child_entry_f *child = &trie_node_children(hwdb, node)[i];
-
- linebuf_add_char(buf, child->c);
- err = trie_fnmatch_f(hwdb, trie_node_from_off(hwdb, child->child_off), 0, buf, search);
- if (err < 0)
- return err;
- linebuf_rem_char(buf);
- }
-
- if (node->values_count && fnmatch(linebuf_get(buf), search, 0) == 0)
- for (i = 0; i < node->values_count; i++) {
- err = hwdb_add_property(hwdb, trie_string(hwdb, trie_node_values(hwdb, node)[i].key_off),
- trie_string(hwdb, trie_node_values(hwdb, node)[i].value_off));
- if (err < 0)
- return err;
- }
-
- linebuf_rem(buf, len);
- return 0;
-}
-
-static int trie_search_f(struct udev_hwdb *hwdb, const char *search) {
- struct linebuf buf;
- const struct trie_node_f *node;
- size_t i = 0;
- int err;
-
- linebuf_init(&buf);
-
- node = trie_node_from_off(hwdb, hwdb->head->nodes_root_off);
- while (node) {
- const struct trie_node_f *child;
- size_t p = 0;
-
- if (node->prefix_off) {
- uint8_t c;
-
- for (; (c = trie_string(hwdb, node->prefix_off)[p]); p++) {
- if (c == '*' || c == '?' || c == '[')
- return trie_fnmatch_f(hwdb, node, p, &buf, search + i + p);
- if (c != search[i + p])
- return 0;
- }
- i += p;
- }
-
- child = node_lookup_f(hwdb, node, '*');
- if (child) {
- linebuf_add_char(&buf, '*');
- err = trie_fnmatch_f(hwdb, child, 0, &buf, search + i);
- if (err < 0)
- return err;
- linebuf_rem_char(&buf);
- }
-
- child = node_lookup_f(hwdb, node, '?');
- if (child) {
- linebuf_add_char(&buf, '?');
- err = trie_fnmatch_f(hwdb, child, 0, &buf, search + i);
- if (err < 0)
- return err;
- linebuf_rem_char(&buf);
- }
-
- child = node_lookup_f(hwdb, node, '[');
- if (child) {
- linebuf_add_char(&buf, '[');
- err = trie_fnmatch_f(hwdb, child, 0, &buf, search + i);
- if (err < 0)
- return err;
- linebuf_rem_char(&buf);
- }
-
- if (search[i] == '\0') {
- size_t n;
-
- for (n = 0; n < node->values_count; n++) {
- err = hwdb_add_property(hwdb, trie_string(hwdb, trie_node_values(hwdb, node)[n].key_off),
- trie_string(hwdb, trie_node_values(hwdb, node)[n].value_off));
- if (err < 0)
- return err;
- }
- return 0;
- }
-
- child = node_lookup_f(hwdb, node, search[i]);
- node = child;
- i++;
- }
- return 0;
-}
-
/**
* udev_hwdb_new:
* @udev: udev library context
* Returns: a hwdb context.
**/
_public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
+ _cleanup_hwdb_unref_ sd_hwdb *hwdb_internal = NULL;
struct udev_hwdb *hwdb;
- const char sig[] = HWDB_SIG;
-
- hwdb = new0(struct udev_hwdb, 1);
- if (!hwdb)
- return NULL;
+ int r;
- hwdb->refcount = 1;
- udev_list_init(udev, &hwdb->properties_list, true);
+ assert_return(udev, NULL);
- hwdb->f = fopen("/etc/udev/hwdb.bin", "re");
- if (!hwdb->f) {
- log_debug("error reading /etc/udev/hwdb.bin: %m");
- udev_hwdb_unref(hwdb);
+ r = sd_hwdb_new(&hwdb_internal);
+ if (r < 0)
return NULL;
- }
- if (fstat(fileno(hwdb->f), &hwdb->st) < 0 ||
- (size_t)hwdb->st.st_size < offsetof(struct trie_header_f, strings_len) + 8) {
- log_debug("error reading /etc/udev/hwdb.bin: %m");
- udev_hwdb_unref(hwdb);
+ hwdb = new0(struct udev_hwdb, 1);
+ if (!hwdb)
return NULL;
- }
- hwdb->map = mmap(0, hwdb->st.st_size, PROT_READ, MAP_SHARED, fileno(hwdb->f), 0);
- if (hwdb->map == MAP_FAILED) {
- log_debug("error mapping /etc/udev/hwdb.bin: %m");
- udev_hwdb_unref(hwdb);
- return NULL;
- }
+ hwdb->refcount = 1;
+ hwdb->hwdb = hwdb_internal;
+ hwdb_internal = NULL;
- if (memcmp(hwdb->map, sig, sizeof(hwdb->head->signature)) != 0 ||
- (size_t)hwdb->st.st_size != le64toh(hwdb->head->file_size)) {
- log_debug("error recognizing the format of /etc/udev/hwdb.bin");
- udev_hwdb_unref(hwdb);
- return NULL;
- }
+ udev_list_init(udev, &hwdb->properties_list, true);
- log_debug("=== trie on-disk ===\n");
- log_debug("tool version: %llu", (unsigned long long)le64toh(hwdb->head->tool_version));
- log_debug("file size: %8llu bytes\n", (unsigned long long)hwdb->st.st_size);
- log_debug("header size %8llu bytes\n", (unsigned long long)le64toh(hwdb->head->header_size));
- log_debug("strings %8llu bytes\n", (unsigned long long)le64toh(hwdb->head->strings_len));
- log_debug("nodes %8llu bytes\n", (unsigned long long)le64toh(hwdb->head->nodes_len));
return hwdb;
}
* Drop a reference of a hwdb context. If the refcount reaches zero,
* all resources of the hwdb context will be released.
*
- * Returns: the passed hwdb context if it has still an active reference, or #NULL otherwise.
+ * Returns: #NULL
**/
_public_ struct udev_hwdb *udev_hwdb_unref(struct udev_hwdb *hwdb) {
if (!hwdb)
return NULL;
hwdb->refcount--;
if (hwdb->refcount > 0)
- return hwdb;
- if (hwdb->f)
- fclose(hwdb->f);
- if (hwdb->map)
- munmap((void *)hwdb->map, hwdb->st.st_size);
+ return NULL;
+ sd_hwdb_unref(hwdb->hwdb);
udev_list_cleanup(&hwdb->properties_list);
free(hwdb);
return NULL;
}
bool udev_hwdb_validate(struct udev_hwdb *hwdb) {
- struct stat st;
-
if (!hwdb)
return false;
- if (!hwdb->f)
- return false;
- if (fstat(fileno(hwdb->f), &st) < 0)
- return true;
- if (ts_usec(&hwdb->st.st_mtim) != ts_usec(&st.st_mtim))
- return true;
- return false;
+
+ return hwdb_validate(hwdb->hwdb);
}
/**
* Returns: a udev_list_entry.
*/
_public_ struct udev_list_entry *udev_hwdb_get_properties_list_entry(struct udev_hwdb *hwdb, const char *modalias, unsigned int flags) {
- int err;
+ const char *key, *value;
- if (!hwdb->f) {
+ if (!hwdb || !modalias) {
errno = EINVAL;
return NULL;
}
- err = trie_search_f(hwdb, modalias);
- if (err < 0) {
- errno = -err;
- return NULL;
+ udev_list_cleanup(&hwdb->properties_list);
+
+ SD_HWDB_FOREACH_PROPERTY(hwdb->hwdb, modalias, key, value) {
+ if (udev_list_entry_add(&hwdb->properties_list, key, value) == NULL) {
+ errno = ENOMEM;
+ return NULL;
+ }
}
+
return udev_list_get_entry(&hwdb->properties_list);
}
~ianmdlvl / elogind.git / blobdiff