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-rw-r--r--src/libudev/libudev-hwdb-def.h74
-rw-r--r--src/libudev/libudev-hwdb.c391
-rw-r--r--src/libudev/libudev-private.h14
-rw-r--r--src/libudev/libudev.h11
-rw-r--r--src/libudev/libudev.sym8
5 files changed, 492 insertions, 6 deletions
diff --git a/src/libudev/libudev-hwdb-def.h b/src/libudev/libudev-hwdb-def.h
new file mode 100644
index 0000000000..8bc694457a
--- /dev/null
+++ b/src/libudev/libudev-hwdb-def.h
@@ -0,0 +1,74 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Kay Sievers <kay.sievers@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/>.
+***/
+
+#ifndef _LIBUDEV_HWDB_DEF_H_
+#define _LIBUDEV_HWDB_DEF_H_
+
+#include "sparse-endian.h"
+
+#define HWDB_SIG { 'K', 'S', 'L', 'P', 'H', 'H', 'R', 'H' }
+
+/* on-disk trie objects */
+_packed_ struct trie_header_f {
+ uint8_t signature[8];
+
+ /* version of tool which created the file */
+ le64_t tool_version;
+ le64_t file_size;
+
+ /* size of structures to allow them to grow */
+ le64_t header_size;
+ le64_t node_size;
+ le64_t child_entry_size;
+ le64_t value_entry_size;
+
+ /* offset of the root trie node */
+ le64_t nodes_root_off;
+
+ /* size of the nodes and string section */
+ le64_t nodes_len;
+ le64_t strings_len;
+};
+
+_packed_ struct trie_node_f {
+ /* prefix of lookup string, shared by all children */
+ le64_t prefix_off;
+ /* size of children entry array appended to the node */
+ uint8_t children_count;
+ uint8_t padding[7];
+ /* size of value entry array appended to the node */
+ le64_t values_count;
+};
+
+/* array of child entries, follows directly the node record */
+_packed_ struct trie_child_entry_f {
+ /* index of the child node */
+ uint8_t c;
+ uint8_t padding[7];
+ /* offset of the child node */
+ le64_t child_off;
+};
+
+/* array of value entries, follows directly the node record/child array */
+_packed_ struct trie_value_entry_f {
+ le64_t key_off;
+ le64_t value_off;
+};
+
+#endif
diff --git a/src/libudev/libudev-hwdb.c b/src/libudev/libudev-hwdb.c
new file mode 100644
index 0000000000..92c58b61a2
--- /dev/null
+++ b/src/libudev/libudev-hwdb.c
@@ -0,0 +1,391 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Kay Sievers <kay.sievers@vrfy.org>
+ Copyright 2008 Alan Jenkins <alan.christopher.jenkins@googlemail.com>
+
+ 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 <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"
+
+/**
+ * SECTION:libudev-hwdb
+ * @short_description: retrieve properties from the hardware database
+ *
+ * Libuded hardware database interface.
+ */
+
+/**
+ * udev_hwdb:
+ *
+ * Opaque object representing the hardware database.
+ */
+struct udev_hwdb {
+ struct udev *udev;
+ int refcount;
+
+ FILE *f;
+ struct stat st;
+ union {
+ struct trie_header_f *head;
+ const char *map;
+ };
+
+ 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
+ *
+ * Create a hardware database context to query properties for devices.
+ *
+ * Returns: a hwdb context.
+ **/
+_public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
+ struct udev_hwdb *hwdb;
+ const char sig[] = HWDB_SIG;
+
+ hwdb = new0(struct udev_hwdb, 1);
+ if (!hwdb)
+ return NULL;
+
+ hwdb->refcount = 1;
+ udev_list_init(udev, &hwdb->properties_list, true);
+
+ hwdb->f = fopen("/etc/udev/hwdb.bin", "re");
+ if (!hwdb->f) {
+ log_debug("error reading /etc/udev/hwdb.bin: %m");
+ udev_hwdb_unref(hwdb);
+ 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);
+ 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;
+ }
+
+ 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;
+ }
+
+ 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;
+}
+
+/**
+ * udev_hwdb_ref:
+ * @hwdb: context
+ *
+ * Take a reference of a hwdb context.
+ *
+ * Returns: the passed enumeration context
+ **/
+_public_ struct udev_hwdb *udev_hwdb_ref(struct udev_hwdb *hwdb) {
+ if (!hwdb)
+ return NULL;
+ hwdb->refcount++;
+ return hwdb;
+}
+
+/**
+ * udev_hwdb_unref:
+ * @hwdb: context
+ *
+ * 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.
+ **/
+_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);
+ 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;
+}
+
+/**
+ * udev_hwdb_get_properties_list_entry:
+ * @hwdb: context
+ * @modalias: modalias string
+ * @flags: (unused)
+ *
+ * Lookup a matching device in the hardware database. The lookup key is a
+ * modalias string, whose formats are defined for the Linux kernel modules.
+ * Examples are: pci:v00008086d00001C2D*, usb:v04F2pB221*. The first entry
+ * of a list of retrieved properties is returned.
+ *
+ * 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;
+
+ if (!hwdb->f) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ err = trie_search_f(hwdb, modalias);
+ if (err < 0) {
+ errno = -err;
+ return NULL;
+ }
+ return udev_list_get_entry(&hwdb->properties_list);
+}
diff --git a/src/libudev/libudev-private.h b/src/libudev/libudev-private.h
index 2add8b3577..d233565fb8 100644
--- a/src/libudev/libudev-private.h
+++ b/src/libudev/libudev-private.h
@@ -140,11 +140,14 @@ void udev_queue_export_cleanup(struct udev_queue_export *udev_queue_export);
int udev_queue_export_device_queued(struct udev_queue_export *udev_queue_export, struct udev_device *udev_device);
int udev_queue_export_device_finished(struct udev_queue_export *udev_queue_export, struct udev_device *udev_device);
+/* libudev-hwdb.c */
+bool udev_hwdb_validate(struct udev_hwdb *hwdb);
+
/* libudev-util.c */
-#define UTIL_PATH_SIZE 1024
-#define UTIL_NAME_SIZE 512
-#define UTIL_LINE_SIZE 16384
-#define UDEV_ALLOWED_CHARS_INPUT "/ $%?,"
+#define UTIL_PATH_SIZE 1024
+#define UTIL_NAME_SIZE 512
+#define UTIL_LINE_SIZE 16384
+#define UDEV_ALLOWED_CHARS_INPUT "/ $%?,"
ssize_t util_get_sys_core_link_value(struct udev *udev, const char *slink, const char *syspath, char *value, size_t size);
int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size);
int util_log_priority(const char *priority);
@@ -163,8 +166,7 @@ uint64_t util_string_bloom64(const char *str);
int util_delete_path(struct udev *udev, const char *path);
uid_t util_lookup_user(struct udev *udev, const char *user);
gid_t util_lookup_group(struct udev *udev, const char *group);
-int util_resolve_subsys_kernel(struct udev *udev, const char *string,
- char *result, size_t maxsize, int read_value);
+int util_resolve_subsys_kernel(struct udev *udev, const char *string, char *result, size_t maxsize, int read_value);
unsigned long long ts_usec(const struct timespec *ts);
unsigned long long now_usec(void);
ssize_t print_kmsg(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
diff --git a/src/libudev/libudev.h b/src/libudev/libudev.h
index 799f47096e..cab2323dea 100644
--- a/src/libudev/libudev.h
+++ b/src/libudev/libudev.h
@@ -171,6 +171,17 @@ int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue *udev_queue,
struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue);
/*
+ * udev_hwdb
+ *
+ * access to the static hardware properties database
+ */
+struct udev_hwdb;
+struct udev_hwdb *udev_hwdb_new(struct udev *udev);
+struct udev_hwdb *udev_hwdb_ref(struct udev_hwdb *hwdb);
+struct udev_hwdb *udev_hwdb_unref(struct udev_hwdb *hwdb);
+struct udev_list_entry *udev_hwdb_get_properties_list_entry(struct udev_hwdb *hwdb, const char *modalias, unsigned int flags);
+
+/*
* udev_util
*
* udev specific utilities
diff --git a/src/libudev/libudev.sym b/src/libudev/libudev.sym
index 5b2c3d32cc..df6a1aeddf 100644
--- a/src/libudev/libudev.sym
+++ b/src/libudev/libudev.sym
@@ -100,3 +100,11 @@ LIBUDEV_189 {
global:
udev_device_new_from_device_id;
} LIBUDEV_183;
+
+LIBUDEV_196 {
+global:
+ udev_hwdb_new;
+ udev_hwdb_ref;
+ udev_hwdb_unref;
+ udev_hwdb_get_properties_list_entry;
+} LIBUDEV_189;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-01 08:51:58 +0000