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-rw-r--r--src/grp-udev/systemd-hwdb/hwdb.c771
1 files changed, 771 insertions, 0 deletions
diff --git a/src/grp-udev/systemd-hwdb/hwdb.c b/src/grp-udev/systemd-hwdb/hwdb.c
new file mode 100644
index 0000000000..5893fde05d
--- /dev/null
+++ b/src/grp-udev/systemd-hwdb/hwdb.c
@@ -0,0 +1,771 @@
+/***
+ This file is part of systemd.
+
+ Copyright 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 <ctype.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sd-hwdb/hwdb-internal.h"
+#include "sd-hwdb/hwdb-util.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/conf-files.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/fs-util.h"
+#include "systemd-basic/label.h"
+#include "systemd-basic/mkdir.h"
+#include "systemd-basic/selinux-util.h"
+#include "systemd-basic/strbuf.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/strv.h"
+#include "systemd-basic/util.h"
+#include "systemd-basic/verbs.h"
+
+/*
+ * Generic udev properties, key/value database based on modalias strings.
+ * Uses a Patricia/radix trie to index all matches for efficient lookup.
+ */
+
+static const char *arg_hwdb_bin_dir = "/etc/udev";
+static const char *arg_root = "";
+
+static const char * const conf_file_dirs[] = {
+ "/etc/udev/hwdb.d",
+ UDEVLIBEXECDIR "/hwdb.d",
+ NULL
+};
+
+/* in-memory trie objects */
+struct trie {
+ struct trie_node *root;
+ struct strbuf *strings;
+
+ size_t nodes_count;
+ size_t children_count;
+ size_t values_count;
+};
+
+struct trie_node {
+ /* prefix, common part for all children of this node */
+ size_t prefix_off;
+
+ /* sorted array of pointers to children nodes */
+ struct trie_child_entry *children;
+ uint8_t children_count;
+
+ /* sorted array of key/value pairs */
+ struct trie_value_entry *values;
+ size_t values_count;
+};
+
+/* children array item with char (0-255) index */
+struct trie_child_entry {
+ uint8_t c;
+ struct trie_node *child;
+};
+
+/* value array item with key/value pairs */
+struct trie_value_entry {
+ size_t key_off;
+ size_t value_off;
+ size_t filename_off;
+ size_t line_number;
+};
+
+static int trie_children_cmp(const void *v1, const void *v2) {
+ const struct trie_child_entry *n1 = v1;
+ const struct trie_child_entry *n2 = v2;
+
+ return n1->c - n2->c;
+}
+
+static int node_add_child(struct trie *trie, struct trie_node *node, struct trie_node *node_child, uint8_t c) {
+ struct trie_child_entry *child;
+
+ /* extend array, add new entry, sort for bisection */
+ child = realloc(node->children, (node->children_count + 1) * sizeof(struct trie_child_entry));
+ if (!child)
+ return -ENOMEM;
+
+ node->children = child;
+ trie->children_count++;
+ node->children[node->children_count].c = c;
+ node->children[node->children_count].child = node_child;
+ node->children_count++;
+ qsort(node->children, node->children_count, sizeof(struct trie_child_entry), trie_children_cmp);
+ trie->nodes_count++;
+
+ return 0;
+}
+
+static struct trie_node *node_lookup(const struct trie_node *node, uint8_t c) {
+ struct trie_child_entry *child;
+ struct trie_child_entry search;
+
+ search.c = c;
+ child = bsearch(&search, node->children, node->children_count, sizeof(struct trie_child_entry), trie_children_cmp);
+ if (child)
+ return child->child;
+ return NULL;
+}
+
+static void trie_node_cleanup(struct trie_node *node) {
+ size_t i;
+
+ for (i = 0; i < node->children_count; i++)
+ trie_node_cleanup(node->children[i].child);
+ free(node->children);
+ free(node->values);
+ free(node);
+}
+
+static void trie_free(struct trie *trie) {
+ if (!trie)
+ return;
+
+ if (trie->root)
+ trie_node_cleanup(trie->root);
+
+ strbuf_cleanup(trie->strings);
+ free(trie);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(struct trie*, trie_free);
+
+static int trie_values_cmp(const void *v1, const void *v2, void *arg) {
+ const struct trie_value_entry *val1 = v1;
+ const struct trie_value_entry *val2 = v2;
+ struct trie *trie = arg;
+
+ return strcmp(trie->strings->buf + val1->key_off,
+ trie->strings->buf + val2->key_off);
+}
+
+static int trie_node_add_value(struct trie *trie, struct trie_node *node,
+ const char *key, const char *value,
+ const char *filename, size_t line_number) {
+ ssize_t k, v, fn;
+ struct trie_value_entry *val;
+ int r;
+
+ k = strbuf_add_string(trie->strings, key, strlen(key));
+ if (k < 0)
+ return k;
+ v = strbuf_add_string(trie->strings, value, strlen(value));
+ if (v < 0)
+ return v;
+ fn = strbuf_add_string(trie->strings, filename, strlen(filename));
+ if (fn < 0)
+ return fn;
+
+ if (node->values_count) {
+ struct trie_value_entry search = {
+ .key_off = k,
+ .value_off = v,
+ };
+
+ val = xbsearch_r(&search, node->values, node->values_count, sizeof(struct trie_value_entry), trie_values_cmp, trie);
+ if (val) {
+ /*
+ * At this point we have 2 identical properties on the same match-string. We
+ * strictly order them by filename+line-number, since we know the dynamic
+ * runtime lookup does the same for multiple matching nodes.
+ */
+ r = strcmp(filename, trie->strings->buf + val->filename_off);
+ if (r < 0 ||
+ (r == 0 && line_number < val->line_number))
+ return 0;
+
+ /* replace existing earlier key with new value */
+ val->value_off = v;
+ val->filename_off = fn;
+ val->line_number = line_number;
+ return 0;
+ }
+ }
+
+ /* extend array, add new entry, sort for bisection */
+ val = realloc(node->values, (node->values_count + 1) * sizeof(struct trie_value_entry));
+ if (!val)
+ return -ENOMEM;
+ trie->values_count++;
+ node->values = val;
+ node->values[node->values_count].key_off = k;
+ node->values[node->values_count].value_off = v;
+ node->values[node->values_count].filename_off = fn;
+ node->values[node->values_count].line_number = line_number;
+ node->values_count++;
+ qsort_r(node->values, node->values_count, sizeof(struct trie_value_entry), trie_values_cmp, trie);
+ return 0;
+}
+
+static int trie_insert(struct trie *trie, struct trie_node *node, const char *search,
+ const char *key, const char *value,
+ const char *filename, uint64_t line_number) {
+ size_t i = 0;
+ int err = 0;
+
+ for (;;) {
+ size_t p;
+ uint8_t c;
+ struct trie_node *child;
+
+ for (p = 0; (c = trie->strings->buf[node->prefix_off + p]); p++) {
+ _cleanup_free_ char *s = NULL;
+ ssize_t off;
+ _cleanup_free_ struct trie_node *new_child = NULL;
+
+ if (c == search[i + p])
+ continue;
+
+ /* split node */
+ new_child = new0(struct trie_node, 1);
+ if (!new_child)
+ return -ENOMEM;
+
+ /* move values from parent to child */
+ new_child->prefix_off = node->prefix_off + p+1;
+ new_child->children = node->children;
+ new_child->children_count = node->children_count;
+ new_child->values = node->values;
+ new_child->values_count = node->values_count;
+
+ /* update parent; use strdup() because the source gets realloc()d */
+ s = strndup(trie->strings->buf + node->prefix_off, p);
+ if (!s)
+ return -ENOMEM;
+
+ off = strbuf_add_string(trie->strings, s, p);
+ if (off < 0)
+ return off;
+
+ node->prefix_off = off;
+ node->children = NULL;
+ node->children_count = 0;
+ node->values = NULL;
+ node->values_count = 0;
+ err = node_add_child(trie, node, new_child, c);
+ if (err < 0)
+ return err;
+
+ new_child = NULL; /* avoid cleanup */
+ break;
+ }
+ i += p;
+
+ c = search[i];
+ if (c == '\0')
+ return trie_node_add_value(trie, node, key, value, filename, line_number);
+
+ child = node_lookup(node, c);
+ if (!child) {
+ ssize_t off;
+
+ /* new child */
+ child = new0(struct trie_node, 1);
+ if (!child)
+ return -ENOMEM;
+
+ off = strbuf_add_string(trie->strings, search + i+1, strlen(search + i+1));
+ if (off < 0) {
+ free(child);
+ return off;
+ }
+
+ child->prefix_off = off;
+ err = node_add_child(trie, node, child, c);
+ if (err < 0) {
+ free(child);
+ return err;
+ }
+
+ return trie_node_add_value(trie, child, key, value, filename, line_number);
+ }
+
+ node = child;
+ i++;
+ }
+}
+
+struct trie_f {
+ FILE *f;
+ struct trie *trie;
+ uint64_t strings_off;
+
+ uint64_t nodes_count;
+ uint64_t children_count;
+ uint64_t values_count;
+};
+
+/* calculate the storage space for the nodes, children arrays, value arrays */
+static void trie_store_nodes_size(struct trie_f *trie, struct trie_node *node) {
+ uint64_t i;
+
+ for (i = 0; i < node->children_count; i++)
+ trie_store_nodes_size(trie, node->children[i].child);
+
+ trie->strings_off += sizeof(struct trie_node_f);
+ for (i = 0; i < node->children_count; i++)
+ trie->strings_off += sizeof(struct trie_child_entry_f);
+ for (i = 0; i < node->values_count; i++)
+ trie->strings_off += sizeof(struct trie_value_entry2_f);
+}
+
+static int64_t trie_store_nodes(struct trie_f *trie, struct trie_node *node) {
+ uint64_t i;
+ struct trie_node_f n = {
+ .prefix_off = htole64(trie->strings_off + node->prefix_off),
+ .children_count = node->children_count,
+ .values_count = htole64(node->values_count),
+ };
+ struct trie_child_entry_f *children = NULL;
+ int64_t node_off;
+
+ if (node->children_count) {
+ children = new0(struct trie_child_entry_f, node->children_count);
+ if (!children)
+ return -ENOMEM;
+ }
+
+ /* post-order recursion */
+ for (i = 0; i < node->children_count; i++) {
+ int64_t child_off;
+
+ child_off = trie_store_nodes(trie, node->children[i].child);
+ if (child_off < 0) {
+ free(children);
+ return child_off;
+ }
+ children[i].c = node->children[i].c;
+ children[i].child_off = htole64(child_off);
+ }
+
+ /* write node */
+ node_off = ftello(trie->f);
+ fwrite(&n, sizeof(struct trie_node_f), 1, trie->f);
+ trie->nodes_count++;
+
+ /* append children array */
+ if (node->children_count) {
+ fwrite(children, sizeof(struct trie_child_entry_f), node->children_count, trie->f);
+ trie->children_count += node->children_count;
+ free(children);
+ }
+
+ /* append values array */
+ for (i = 0; i < node->values_count; i++) {
+ struct trie_value_entry2_f v = {
+ .key_off = htole64(trie->strings_off + node->values[i].key_off),
+ .value_off = htole64(trie->strings_off + node->values[i].value_off),
+ .filename_off = htole64(trie->strings_off + node->values[i].filename_off),
+ .line_number = htole64(node->values[i].line_number),
+ };
+
+ fwrite(&v, sizeof(struct trie_value_entry2_f), 1, trie->f);
+ trie->values_count++;
+ }
+
+ return node_off;
+}
+
+static int trie_store(struct trie *trie, const char *filename) {
+ struct trie_f t = {
+ .trie = trie,
+ };
+ _cleanup_free_ char *filename_tmp = NULL;
+ int64_t pos;
+ int64_t root_off;
+ int64_t size;
+ struct trie_header_f h = {
+ .signature = HWDB_SIG,
+ .tool_version = htole64(atoi(VERSION)),
+ .header_size = htole64(sizeof(struct trie_header_f)),
+ .node_size = htole64(sizeof(struct trie_node_f)),
+ .child_entry_size = htole64(sizeof(struct trie_child_entry_f)),
+ .value_entry_size = htole64(sizeof(struct trie_value_entry2_f)),
+ };
+ int err;
+
+ /* calculate size of header, nodes, children entries, value entries */
+ t.strings_off = sizeof(struct trie_header_f);
+ trie_store_nodes_size(&t, trie->root);
+
+ err = fopen_temporary(filename , &t.f, &filename_tmp);
+ if (err < 0)
+ return err;
+ fchmod(fileno(t.f), 0444);
+
+ /* write nodes */
+ err = fseeko(t.f, sizeof(struct trie_header_f), SEEK_SET);
+ if (err < 0) {
+ fclose(t.f);
+ unlink_noerrno(filename_tmp);
+ return -errno;
+ }
+ root_off = trie_store_nodes(&t, trie->root);
+ h.nodes_root_off = htole64(root_off);
+ pos = ftello(t.f);
+ h.nodes_len = htole64(pos - sizeof(struct trie_header_f));
+
+ /* write string buffer */
+ fwrite(trie->strings->buf, trie->strings->len, 1, t.f);
+ h.strings_len = htole64(trie->strings->len);
+
+ /* write header */
+ size = ftello(t.f);
+ h.file_size = htole64(size);
+ err = fseeko(t.f, 0, SEEK_SET);
+ if (err < 0) {
+ fclose(t.f);
+ unlink_noerrno(filename_tmp);
+ return -errno;
+ }
+ fwrite(&h, sizeof(struct trie_header_f), 1, t.f);
+ err = ferror(t.f);
+ if (err)
+ err = -errno;
+ fclose(t.f);
+ if (err < 0 || rename(filename_tmp, filename) < 0) {
+ unlink_noerrno(filename_tmp);
+ return err < 0 ? err : -errno;
+ }
+
+ log_debug("=== trie on-disk ===");
+ log_debug("size: %8"PRIi64" bytes", size);
+ log_debug("header: %8zu bytes", sizeof(struct trie_header_f));
+ log_debug("nodes: %8"PRIu64" bytes (%8"PRIu64")",
+ t.nodes_count * sizeof(struct trie_node_f), t.nodes_count);
+ log_debug("child pointers: %8"PRIu64" bytes (%8"PRIu64")",
+ t.children_count * sizeof(struct trie_child_entry_f), t.children_count);
+ log_debug("value pointers: %8"PRIu64" bytes (%8"PRIu64")",
+ t.values_count * sizeof(struct trie_value_entry2_f), t.values_count);
+ log_debug("string store: %8zu bytes", trie->strings->len);
+ log_debug("strings start: %8"PRIu64, t.strings_off);
+
+ return 0;
+}
+
+static int insert_data(struct trie *trie, char **match_list, char *line,
+ const char *filename, size_t line_number) {
+ char *value, **entry;
+
+ value = strchr(line, '=');
+ if (!value) {
+ log_error("Error, key/value pair expected but got '%s' in '%s':", line, filename);
+ return -EINVAL;
+ }
+
+ value[0] = '\0';
+ value++;
+
+ /* libudev requires properties to start with a space */
+ while (isblank(line[0]) && isblank(line[1]))
+ line++;
+
+ if (line[0] == '\0' || value[0] == '\0') {
+ log_error("Error, empty key or value '%s' in '%s':", line, filename);
+ return -EINVAL;
+ }
+
+ STRV_FOREACH(entry, match_list)
+ trie_insert(trie, trie->root, *entry, line, value, filename, line_number);
+
+ return 0;
+}
+
+static int import_file(struct trie *trie, const char *filename) {
+ enum {
+ HW_NONE,
+ HW_MATCH,
+ HW_DATA,
+ } state = HW_NONE;
+ _cleanup_fclose_ FILE *f = NULL;
+ char line[LINE_MAX];
+ _cleanup_strv_free_ char **match_list = NULL;
+ size_t line_number = 0;
+ char *match = NULL;
+ int r;
+
+ f = fopen(filename, "re");
+ if (!f)
+ return -errno;
+
+ while (fgets(line, sizeof(line), f)) {
+ size_t len;
+ char *pos;
+
+ ++line_number;
+
+ /* comment line */
+ if (line[0] == '#')
+ continue;
+
+ /* strip trailing comment */
+ pos = strchr(line, '#');
+ if (pos)
+ pos[0] = '\0';
+
+ /* strip trailing whitespace */
+ len = strlen(line);
+ while (len > 0 && isspace(line[len-1]))
+ len--;
+ line[len] = '\0';
+
+ switch (state) {
+ case HW_NONE:
+ if (len == 0)
+ break;
+
+ if (line[0] == ' ') {
+ log_error("Error, MATCH expected but got '%s' in '%s':", line, filename);
+ break;
+ }
+
+ /* start of record, first match */
+ state = HW_MATCH;
+
+ match = strdup(line);
+ if (!match)
+ return -ENOMEM;
+
+ r = strv_consume(&match_list, match);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case HW_MATCH:
+ if (len == 0) {
+ log_error("Error, DATA expected but got empty line in '%s':", filename);
+ state = HW_NONE;
+ strv_clear(match_list);
+ break;
+ }
+
+ /* another match */
+ if (line[0] != ' ') {
+ match = strdup(line);
+ if (!match)
+ return -ENOMEM;
+
+ r = strv_consume(&match_list, match);
+ if (r < 0)
+ return r;
+
+ break;
+ }
+
+ /* first data */
+ state = HW_DATA;
+ insert_data(trie, match_list, line, filename, line_number);
+ break;
+
+ case HW_DATA:
+ /* end of record */
+ if (len == 0) {
+ state = HW_NONE;
+ strv_clear(match_list);
+ break;
+ }
+
+ if (line[0] != ' ') {
+ log_error("Error, DATA expected but got '%s' in '%s':", line, filename);
+ state = HW_NONE;
+ strv_clear(match_list);
+ break;
+ }
+
+ insert_data(trie, match_list, line, filename, line_number);
+ break;
+ };
+ }
+
+ return 0;
+}
+
+static int hwdb_query(int argc, char *argv[], void *userdata) {
+ _cleanup_(sd_hwdb_unrefp) sd_hwdb *hwdb = NULL;
+ const char *key, *value;
+ const char *modalias;
+ int r;
+
+ assert(argc >= 2);
+ assert(argv);
+
+ modalias = argv[1];
+
+ r = sd_hwdb_new(&hwdb);
+ if (r < 0)
+ return r;
+
+ SD_HWDB_FOREACH_PROPERTY(hwdb, modalias, key, value)
+ printf("%s=%s\n", key, value);
+
+ return 0;
+}
+
+static int hwdb_update(int argc, char *argv[], void *userdata) {
+ _cleanup_free_ char *hwdb_bin = NULL;
+ _cleanup_(trie_freep) struct trie *trie = NULL;
+ char **files, **f;
+ int r;
+
+ trie = new0(struct trie, 1);
+ if (!trie)
+ return -ENOMEM;
+
+ /* string store */
+ trie->strings = strbuf_new();
+ if (!trie->strings)
+ return -ENOMEM;
+
+ /* index */
+ trie->root = new0(struct trie_node, 1);
+ if (!trie->root)
+ return -ENOMEM;
+
+ trie->nodes_count++;
+
+ r = conf_files_list_strv(&files, ".hwdb", arg_root, conf_file_dirs);
+ if (r < 0)
+ return log_error_errno(r, "failed to enumerate hwdb files: %m");
+
+ STRV_FOREACH(f, files) {
+ log_debug("reading file '%s'", *f);
+ import_file(trie, *f);
+ }
+ strv_free(files);
+
+ strbuf_complete(trie->strings);
+
+ log_debug("=== trie in-memory ===");
+ log_debug("nodes: %8zu bytes (%8zu)",
+ trie->nodes_count * sizeof(struct trie_node), trie->nodes_count);
+ log_debug("children arrays: %8zu bytes (%8zu)",
+ trie->children_count * sizeof(struct trie_child_entry), trie->children_count);
+ log_debug("values arrays: %8zu bytes (%8zu)",
+ trie->values_count * sizeof(struct trie_value_entry), trie->values_count);
+ log_debug("strings: %8zu bytes",
+ trie->strings->len);
+ log_debug("strings incoming: %8zu bytes (%8zu)",
+ trie->strings->in_len, trie->strings->in_count);
+ log_debug("strings dedup'ed: %8zu bytes (%8zu)",
+ trie->strings->dedup_len, trie->strings->dedup_count);
+
+ hwdb_bin = strjoin(arg_root, "/", arg_hwdb_bin_dir, "/hwdb.bin", NULL);
+ if (!hwdb_bin)
+ return -ENOMEM;
+
+ mkdir_parents_label(hwdb_bin, 0755);
+ r = trie_store(trie, hwdb_bin);
+ if (r < 0)
+ return log_error_errno(r, "Failure writing database %s: %m", hwdb_bin);
+
+ return label_fix(hwdb_bin, false, false);
+}
+
+static void help(void) {
+ printf("Usage: %s OPTIONS COMMAND\n\n"
+ "Update or query the hardware database.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " --usr Generate in " UDEVLIBEXECDIR " instead of /etc/udev\n"
+ " -r --root=PATH Alternative root path in the filesystem\n\n"
+ "Commands:\n"
+ " update Update the hwdb database\n"
+ " query MODALIAS Query database and print result\n",
+ program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_USR,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "usr", no_argument, NULL, ARG_USR },
+ { "root", required_argument, NULL, 'r' },
+ {}
+ };
+
+ int c;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "ut:r:h", options, NULL)) >= 0) {
+ switch(c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ return version();
+
+ case ARG_USR:
+ arg_hwdb_bin_dir = UDEVLIBEXECDIR;
+ break;
+
+ case 'r':
+ arg_root = optarg;
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unknown option");
+ }
+ }
+
+ return 1;
+}
+
+static int hwdb_main(int argc, char *argv[]) {
+ const Verb verbs[] = {
+ { "update", 1, 1, 0, hwdb_update },
+ { "query", 2, 2, 0, hwdb_query },
+ {},
+ };
+
+ return dispatch_verb(argc, argv, verbs, NULL);
+}
+
+int main (int argc, char *argv[]) {
+ int r;
+
+ log_parse_environment();
+ log_open();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ goto finish;
+
+ mac_selinux_init();
+
+ r = hwdb_main(argc, argv);
+
+finish:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-21 16:18:44 +0000