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-rw-r--r--src/libsystemd/sd-hwdb/hwdb-util.c686
1 files changed, 686 insertions, 0 deletions
diff --git a/src/libsystemd/sd-hwdb/hwdb-util.c b/src/libsystemd/sd-hwdb/hwdb-util.c
new file mode 100644
index 0000000..f852967
--- /dev/null
+++ b/src/libsystemd/sd-hwdb/hwdb-util.c
@@ -0,0 +1,686 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <ctype.h>
+#include <stdio.h>
+
+#include "alloc-util.h"
+#include "conf-files.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "hwdb-internal.h"
+#include "hwdb-util.h"
+#include "label.h"
+#include "mkdir.h"
+#include "path-util.h"
+#include "strbuf.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tmpfile-util.h"
+
+static const char *default_hwdb_bin_dir = "/etc/udev";
+static const char * const conf_file_dirs[] = {
+ "/etc/udev/hwdb.d",
+ UDEVLIBEXECDIR "/hwdb.d",
+ NULL
+};
+
+/*
+ * Generic udev properties, key-value database based on modalias strings.
+ * Uses a Patricia/radix trie to index all matches for efficient lookup.
+ */
+
+/* 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;
+ uint32_t line_number;
+ uint16_t file_priority;
+};
+
+static int trie_children_cmp(const struct trie_child_entry *a, const struct trie_child_entry *b) {
+ return CMP(a->c, b->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 = reallocarray(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++;
+ typesafe_qsort(node->children, node->children_count, 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 = typesafe_bsearch(&search, node->children, node->children_count, trie_children_cmp);
+ if (child)
+ return child->child;
+ return NULL;
+}
+
+static void trie_node_cleanup(struct trie_node *node) {
+ size_t i;
+
+ if (!node)
+ return;
+
+ 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;
+
+ 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 struct trie_value_entry *a, const struct trie_value_entry *b, struct trie *trie) {
+ return strcmp(trie->strings->buf + a->key_off,
+ trie->strings->buf + b->key_off);
+}
+
+static int trie_node_add_value(struct trie *trie, struct trie_node *node,
+ const char *key, const char *value,
+ const char *filename, uint16_t file_priority, uint32_t line_number, bool compat) {
+ ssize_t k, v, fn = 0;
+ struct trie_value_entry *val;
+
+ 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;
+
+ if (!compat) {
+ 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 = typesafe_bsearch_r(&search, node->values, node->values_count, trie_values_cmp, trie);
+ if (val) {
+ /* At this point we have 2 identical properties on the same match-string.
+ * Since we process files in order, we just replace the previous value. */
+ val->value_off = v;
+ val->filename_off = fn;
+ val->file_priority = file_priority;
+ val->line_number = line_number;
+ return 0;
+ }
+ }
+
+ /* extend array, add new entry, sort for bisection */
+ val = reallocarray(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] = (struct trie_value_entry) {
+ .key_off = k,
+ .value_off = v,
+ .filename_off = fn,
+ .file_priority = file_priority,
+ .line_number = line_number,
+ };
+ node->values_count++;
+ typesafe_qsort_r(node->values, node->values_count, 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, uint16_t file_priority, uint32_t line_number, bool compat) {
+ size_t i = 0;
+ int r = 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_ struct trie_node *new_child = NULL;
+ _cleanup_free_ char *s = NULL;
+ ssize_t off;
+
+ if (c == search[i + p])
+ continue;
+
+ /* split node */
+ new_child = new(struct trie_node, 1);
+ if (!new_child)
+ return -ENOMEM;
+
+ /* move values from parent to child */
+ *new_child = (struct trie_node) {
+ .prefix_off = node->prefix_off + p+1,
+ .children = node->children,
+ .children_count = node->children_count,
+ .values = node->values,
+ .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 = (struct trie_node) {
+ .prefix_off = off,
+ };
+ r = node_add_child(trie, node, new_child, c);
+ if (r < 0)
+ return r;
+
+ new_child = NULL; /* avoid cleanup */
+ break;
+ }
+ i += p;
+
+ c = search[i];
+ if (c == '\0')
+ return trie_node_add_value(trie, node, key, value, filename, file_priority, line_number, compat);
+
+ child = node_lookup(node, c);
+ if (!child) {
+ _cleanup_free_ struct trie_node *new_child = NULL;
+ ssize_t off;
+
+ /* new child */
+ new_child = new(struct trie_node, 1);
+ if (!new_child)
+ return -ENOMEM;
+
+ off = strbuf_add_string(trie->strings, search + i+1, strlen(search + i+1));
+ if (off < 0)
+ return off;
+
+ *new_child = (struct trie_node) {
+ .prefix_off = off,
+ };
+
+ r = node_add_child(trie, node, new_child, c);
+ if (r < 0)
+ return r;
+
+ child = TAKE_PTR(new_child);
+ return trie_node_add_value(trie, child, key, value, filename, file_priority, line_number, compat);
+ }
+
+ 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, bool compat) {
+ uint64_t i;
+
+ for (i = 0; i < node->children_count; i++)
+ trie_store_nodes_size(trie, node->children[i].child, compat);
+
+ 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 += compat ? sizeof(struct trie_value_entry_f) : sizeof(struct trie_value_entry2_f);
+}
+
+static int64_t trie_store_nodes(struct trie_f *trie, struct trie_node *node, bool compat) {
+ 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),
+ };
+ _cleanup_free_ struct trie_child_entry_f *children = NULL;
+ int64_t node_off;
+
+ if (node->children_count) {
+ children = new(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, compat);
+ if (child_off < 0)
+ return child_off;
+
+ children[i] = (struct trie_child_entry_f) {
+ .c = node->children[i].c,
+ .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;
+ }
+
+ /* 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 = htole32(node->values[i].line_number),
+ .file_priority = htole16(node->values[i].file_priority),
+ };
+
+ fwrite(&v, compat ? sizeof(struct trie_value_entry_f) : sizeof(struct trie_value_entry2_f), 1, trie->f);
+ }
+ trie->values_count += node->values_count;
+
+ return node_off;
+}
+
+static int trie_store(struct trie *trie, const char *filename, bool compat) {
+ 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(PROJECT_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(compat ? sizeof(struct trie_value_entry_f) : sizeof(struct trie_value_entry2_f)),
+ };
+ int r;
+
+ /* calculate size of header, nodes, children entries, value entries */
+ t.strings_off = sizeof(struct trie_header_f);
+ trie_store_nodes_size(&t, trie->root, compat);
+
+ r = fopen_temporary(filename, &t.f, &filename_tmp);
+ if (r < 0)
+ return r;
+ fchmod(fileno(t.f), 0444);
+
+ /* write nodes */
+ if (fseeko(t.f, sizeof(struct trie_header_f), SEEK_SET) < 0)
+ goto error_fclose;
+
+ root_off = trie_store_nodes(&t, trie->root, compat);
+ 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);
+ if (fseeko(t.f, 0, SEEK_SET) < 0)
+ goto error_fclose;
+ fwrite(&h, sizeof(struct trie_header_f), 1, t.f);
+
+ if (ferror(t.f))
+ goto error_fclose;
+ if (fflush(t.f) < 0)
+ goto error_fclose;
+ if (fsync(fileno(t.f)) < 0)
+ goto error_fclose;
+ if (rename(filename_tmp, filename) < 0)
+ goto error_fclose;
+
+ /* write succeeded */
+ fclose(t.f);
+
+ 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 * (compat ? sizeof(struct trie_value_entry_f) : 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;
+
+ error_fclose:
+ r = -errno;
+ fclose(t.f);
+ unlink(filename_tmp);
+ return r;
+}
+
+static int insert_data(struct trie *trie, char **match_list, char *line, const char *filename,
+ uint16_t file_priority, uint32_t line_number, bool compat) {
+ char *value, **entry;
+
+ assert(line[0] == ' ');
+
+ value = strchr(line, '=');
+ if (!value)
+ return log_syntax(NULL, LOG_WARNING, filename, line_number, EINVAL,
+ "Key-value pair expected but got \"%s\", ignoring", line);
+
+ value[0] = '\0';
+ value++;
+
+ /* Replace multiple leading spaces by a single space */
+ while (isblank(line[0]) && isblank(line[1]))
+ line++;
+
+ if (isempty(line + 1) || isempty(value))
+ return log_syntax(NULL, LOG_WARNING, filename, line_number, EINVAL,
+ "Empty %s in \"%s=%s\", ignoring",
+ isempty(line + 1) ? "key" : "value",
+ line, value);
+
+ STRV_FOREACH(entry, match_list)
+ trie_insert(trie, trie->root, *entry, line, value, filename, file_priority, line_number, compat);
+
+ return 0;
+}
+
+static int import_file(struct trie *trie, const char *filename, uint16_t file_priority, bool compat) {
+ enum {
+ HW_NONE,
+ HW_MATCH,
+ HW_DATA,
+ } state = HW_NONE;
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_strv_free_ char **match_list = NULL;
+ uint32_t line_number = 0;
+ char *match = NULL;
+ int r = 0, err;
+
+ f = fopen(filename, "re");
+ if (!f)
+ return -errno;
+
+ for (;;) {
+ _cleanup_free_ char *line = NULL;
+ size_t len;
+ char *pos;
+
+ r = read_line(f, LONG_LINE_MAX, &line);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ ++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_syntax(NULL, LOG_WARNING, filename, line_number, EINVAL,
+ "Match expected but got indented property \"%s\", ignoring line", line);
+ r = -EINVAL;
+ break;
+ }
+
+ /* start of record, first match */
+ state = HW_MATCH;
+
+ match = strdup(line);
+ if (!match)
+ return -ENOMEM;
+
+ err = strv_consume(&match_list, match);
+ if (err < 0)
+ return err;
+
+ break;
+
+ case HW_MATCH:
+ if (len == 0) {
+ log_syntax(NULL, LOG_WARNING, filename, line_number, EINVAL,
+ "Property expected, ignoring record with no properties");
+ r = -EINVAL;
+ state = HW_NONE;
+ strv_clear(match_list);
+ break;
+ }
+
+ if (line[0] != ' ') {
+ /* another match */
+ match = strdup(line);
+ if (!match)
+ return -ENOMEM;
+
+ err = strv_consume(&match_list, match);
+ if (err < 0)
+ return err;
+
+ break;
+ }
+
+ /* first data */
+ state = HW_DATA;
+ err = insert_data(trie, match_list, line, filename, file_priority, line_number, compat);
+ if (err < 0)
+ r = err;
+ break;
+
+ case HW_DATA:
+ if (len == 0) {
+ /* end of record */
+ state = HW_NONE;
+ strv_clear(match_list);
+ break;
+ }
+
+ if (line[0] != ' ') {
+ log_syntax(NULL, LOG_WARNING, filename, line_number, EINVAL,
+ "Property or empty line expected, got \"%s\", ignoring record", line);
+ r = -EINVAL;
+ state = HW_NONE;
+ strv_clear(match_list);
+ break;
+ }
+
+ err = insert_data(trie, match_list, line, filename, file_priority, line_number, compat);
+ if (err < 0)
+ r = err;
+ break;
+ };
+ }
+
+ if (state == HW_MATCH)
+ log_syntax(NULL, LOG_WARNING, filename, line_number, EINVAL,
+ "Property expected, ignoring record with no properties");
+
+ return r;
+}
+
+int hwdb_update(const char *root, const char *hwdb_bin_dir, bool strict, bool compat) {
+ _cleanup_free_ char *hwdb_bin = NULL;
+ _cleanup_(trie_freep) struct trie *trie = NULL;
+ _cleanup_strv_free_ char **files = NULL;
+ char **f;
+ uint16_t file_priority = 1;
+ int r = 0, err;
+
+ /* The argument 'compat' controls the format version of database. If false, then hwdb.bin will be created with
+ * additional information such that priority, line number, and filename of database source. If true, then hwdb.bin
+ * will be created without the information. systemd-hwdb command should set the argument false, and 'udevadm hwdb'
+ * command should set it true. */
+
+ 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++;
+
+ err = conf_files_list_strv(&files, ".hwdb", root, 0, conf_file_dirs);
+ if (err < 0)
+ return log_error_errno(err, "Failed to enumerate hwdb files: %m");
+
+ STRV_FOREACH(f, files) {
+ log_debug("Reading file \"%s\"", *f);
+ err = import_file(trie, *f, file_priority++, compat);
+ if (err < 0 && strict)
+ r = err;
+ }
+
+ 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 = path_join(root, hwdb_bin_dir ?: default_hwdb_bin_dir, "hwdb.bin");
+ if (!hwdb_bin)
+ return -ENOMEM;
+
+ mkdir_parents_label(hwdb_bin, 0755);
+ err = trie_store(trie, hwdb_bin, compat);
+ if (err < 0)
+ return log_error_errno(err, "Failed to write database %s: %m", hwdb_bin);
+
+ err = label_fix(hwdb_bin, 0);
+ if (err < 0)
+ return err;
+
+ return r;
+}
+
+int hwdb_query(const char *modalias) {
+ _cleanup_(sd_hwdb_unrefp) sd_hwdb *hwdb = NULL;
+ const char *key, *value;
+ int r;
+
+ assert(modalias);
+
+ 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 18:45:52 +0000