/*** 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 <stdlib.h> #include <unistd.h> #include <getopt.h> #include <string.h> #include "util.h" #include "strbuf.h" #include "conf-files.h" #include "udev.h" #include "libudev-hwdb-def.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 * 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; }; 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; int err = 0; /* extend array, add new entry, sort for bisection */ child = realloc(node->children, (node->children_count + 1) * sizeof(struct trie_child_entry)); if (!child) { err = -ENOMEM; goto out; } 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++; out: return err; } 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 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) { ssize_t k, v; 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 (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) { /* replace existing earlier key with new value */ val->value_off = v; 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_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) { 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++) { char *s; ssize_t off; if (c == search[i + p]) continue; /* split node */ child = calloc(sizeof(struct trie_node), 1); if (!child) { err = -ENOMEM; goto out; } /* move values from parent to child */ child->prefix_off = node->prefix_off + p+1; child->children = node->children; child->children_count = node->children_count; child->values = node->values; 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) { err = -ENOMEM; goto out; } off = strbuf_add_string(trie->strings, s, p); free(s); if (off < 0) { err = off; goto out; } node->prefix_off = off; node->children = NULL; node->children_count = 0; node->values = NULL; node->values_count = 0; err = node_add_child(trie, node, child, c); if (err) goto out; break; } i += p; c = search[i]; if (c == '\0') return trie_node_add_value(trie, node, key, value); child = node_lookup(node, c); if (!child) { ssize_t off; /* new child */ child = calloc(sizeof(struct trie_node), 1); if (!child) { err = -ENOMEM; goto out; } off = strbuf_add_string(trie->strings, search + i+1, strlen(search + i+1)); if (off < 0) { err = off; goto out; } child->prefix_off = off; err = node_add_child(trie, node, child, c); if (err) goto out; return trie_node_add_value(trie, child, key, value); } node = child; i++; } out: return err; } 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_entry_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) 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_entry_f v = { .key_off = htole64(trie->strings_off + node->values[i].key_off), .value_off = htole64(trie->strings_off + node->values[i].value_off), }; fwrite(&v, sizeof(struct trie_value_entry_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, }; char *filename_tmp; 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_entry_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 */ fseeko(t.f, sizeof(struct trie_header_f), SEEK_SET); 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); fseeko(t.f, 0, SEEK_SET); 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(filename_tmp); goto out; } log_debug("=== trie on-disk ===\n"); log_debug("size: %8llu bytes\n", (unsigned long long)size); log_debug("header: %8zu bytes\n", sizeof(struct trie_header_f)); log_debug("nodes: %8llu bytes (%8llu)\n", (unsigned long long)t.nodes_count * sizeof(struct trie_node_f), (unsigned long long)t.nodes_count); log_debug("child pointers: %8llu bytes (%8llu)\n", (unsigned long long)t.children_count * sizeof(struct trie_child_entry_f), (unsigned long long)t.children_count); log_debug("value pointers: %8llu bytes (%8llu)\n", (unsigned long long)t.values_count * sizeof(struct trie_value_entry_f), (unsigned long long)t.values_count); log_debug("string store: %8llu bytes\n", (unsigned long long)trie->strings->len); log_debug("strings start: %8llu\n", (unsigned long long) t.strings_off); out: free(filename_tmp); return err; } static int import_file(struct trie *trie, const char *filename) { FILE *f; char line[LINE_MAX]; char match[LINE_MAX]; char cond[LINE_MAX]; f = fopen(filename, "re"); if (f == NULL) return -errno; match[0] = '\0'; cond[0] = '\0'; while (fgets(line, sizeof(line), f)) { size_t len; if (line[0] == '#') continue; /* new line, new record */ if (line[0] == '\n') { match[0] = '\0'; cond[0] = '\0'; continue; } /* remove newline */ len = strlen(line); if (len < 2) continue; line[len-1] = '\0'; /* start of new record */ if (match[0] == '\0') { strcpy(match, line); cond[0] = '\0'; continue; } if (line[0] == '+') { strcpy(cond, line); continue; } /* TODO: support +; skip the entire record until we support it */ if (cond[0] != '\0') continue; /* value lines */ if (line[0] == ' ') { char *value; value = strchr(line, '='); if (!value) continue; value[0] = '\0'; value++; trie_insert(trie, trie->root, match, line, value); } } fclose(f); return 0; } static void help(void) { printf("Usage: udevadm hwdb OPTIONS\n" " --update update the hardware database\n" " --test=<modalias> query database and print result\n" " --root=<path> alternative root path in the filesystem\n" " --help\n\n"); } static int adm_hwdb(struct udev *udev, int argc, char *argv[]) { static const struct option options[] = { { "update", no_argument, NULL, 'u' }, { "root", required_argument, NULL, 'r' }, { "test", required_argument, NULL, 't' }, { "help", no_argument, NULL, 'h' }, {} }; const char *test = NULL; const char *root = ""; bool update = false; struct trie *trie = NULL; int err; int rc = EXIT_SUCCESS; for (;;) { int option; option = getopt_long(argc, argv, "ut:r:h", options, NULL); if (option == -1) break; switch (option) { case 'u': update = true; break; case 't': test = optarg; break; case 'r': root = optarg; break; case 'h': help(); return EXIT_SUCCESS; } } if (!update && !test) { help(); return EXIT_SUCCESS; } if (update) { char **files, **f; _cleanup_free_ char *hwdb_bin = NULL; trie = calloc(sizeof(struct trie), 1); if (!trie) { rc = EXIT_FAILURE; goto out; } /* string store */ trie->strings = strbuf_new(); if (!trie->strings) { rc = EXIT_FAILURE; goto out; } /* index */ trie->root = calloc(sizeof(struct trie_node), 1); if (!trie->root) { rc = EXIT_FAILURE; goto out; } trie->nodes_count++; err = conf_files_list_strv(&files, ".hwdb", root, conf_file_dirs); if (err < 0) { log_error("failed to enumerate hwdb files: %s\n", strerror(-err)); rc = EXIT_FAILURE; goto out; } 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 ===\n"); log_debug("nodes: %8zu bytes (%8zu)\n", trie->nodes_count * sizeof(struct trie_node), trie->nodes_count); log_debug("children arrays: %8zu bytes (%8zu)\n", trie->children_count * sizeof(struct trie_child_entry), trie->children_count); log_debug("values arrays: %8zu bytes (%8zu)\n", trie->values_count * sizeof(struct trie_value_entry), trie->values_count); log_debug("strings: %8zu bytes\n", trie->strings->len); log_debug("strings incoming: %8zu bytes (%8zu)\n", trie->strings->in_len, trie->strings->in_count); log_debug("strings dedup'ed: %8zu bytes (%8zu)\n", trie->strings->dedup_len, trie->strings->dedup_count); if (asprintf(&hwdb_bin, "%s/etc/udev/hwdb.bin", root) < 0) { rc = EXIT_FAILURE; goto out; } mkdir_parents(hwdb_bin, 0755); err = trie_store(trie, hwdb_bin); if (err < 0) { log_error("Failure writing database %s: %s", hwdb_bin, strerror(-err)); rc = EXIT_FAILURE; } } if (test) { struct udev_hwdb *hwdb = udev_hwdb_new(udev); if (hwdb) { struct udev_list_entry *entry; udev_list_entry_foreach(entry, udev_hwdb_get_properties_list_entry(hwdb, test, 0)) printf("%s=%s\n", udev_list_entry_get_name(entry), udev_list_entry_get_value(entry)); hwdb = udev_hwdb_unref(hwdb); } } out: if (trie) { if (trie->root) trie_node_cleanup(trie->root); strbuf_cleanup(trie->strings); free(trie); } return rc; } const struct udevadm_cmd udevadm_hwdb = { .name = "hwdb", .cmd = adm_hwdb, .help = "maintain the hardware database index", };