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Diffstat (limited to 'src/udev/udev-builtin-hwdb.c')
-rw-r--r--src/udev/udev-builtin-hwdb.c476
1 files changed, 302 insertions, 174 deletions
diff --git a/src/udev/udev-builtin-hwdb.c b/src/udev/udev-builtin-hwdb.c
index 0db21641b1..5ccd06df04 100644
--- a/src/udev/udev-builtin-hwdb.c
+++ b/src/udev/udev-builtin-hwdb.c
@@ -1,22 +1,22 @@
-/*
- * usb-db, pci-db - lookup vendor/product database
- *
- * Copyright (C) 2009 Lennart Poettering <lennart@poettering.net>
- * Copyright (C) 2011 Kay Sievers <kay.sievers@vrfy.org>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
+/***
+ 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>
@@ -24,224 +24,352 @@
#include <inttypes.h>
#include <ctype.h>
#include <stdlib.h>
+#include <fnmatch.h>
+#include <getopt.h>
+#include <sys/mman.h>
#include "udev.h"
+#include "udev-hwdb.h"
-static int get_id_attr(
- struct udev_device *parent,
- const char *name,
- uint16_t *value) {
+struct linebuf {
+ char bytes[LINE_MAX];
+ size_t size;
+ size_t len;
+};
- const char *t;
- unsigned u;
+static void linebuf_init(struct linebuf *buf) {
+ buf->size = 0;
+ buf->len = 0;
+}
- if (!(t = udev_device_get_sysattr_value(parent, name))) {
- fprintf(stderr, "%s lacks %s.\n", udev_device_get_syspath(parent), name);
- return -1;
- }
+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;
+}
- if (startswith(t, "0x"))
- t += 2;
+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;
+}
- if (sscanf(t, "%04x", &u) != 1 || u > 0xFFFFU) {
- fprintf(stderr, "Failed to parse %s on %s.\n", name, udev_device_get_syspath(parent));
- return -1;
- }
+static void linebuf_rem(struct linebuf *buf, size_t count) {
+ assert(buf->len >= count);
+ buf->len -= count;
+}
- *value = (uint16_t) u;
- return 0;
+static void linebuf_rem_char(struct linebuf *buf) {
+ linebuf_rem(buf, 1);
}
-static int get_vid_pid(
- struct udev_device *parent,
- const char *vendor_attr,
- const char *product_attr,
- uint16_t *vid,
- uint16_t *pid) {
+struct trie_f {
+ struct udev_device *dev;
+ bool test;
+ FILE *f;
+ uint64_t file_time_usec;
+ union {
+ struct trie_header_f *head;
+ const char *map;
+ };
+ size_t map_size;
+};
- if (get_id_attr(parent, vendor_attr, vid) < 0)
- return -1;
- else if (*vid <= 0) {
- fprintf(stderr, "Invalid vendor id.\n");
- return -1;
- }
+static const struct trie_child_entry_f *trie_node_children(struct trie_f *trie, const struct trie_node_f *node) {
+ return (const struct trie_child_entry_f *)((const char *)node + le64toh(trie->head->node_size));
+}
- if (get_id_attr(parent, product_attr, pid) < 0)
- return -1;
+static const struct trie_value_entry_f *trie_node_values(struct trie_f *trie, const struct trie_node_f *node) {
+ const char *base = (const char *)node;
- return 0;
+ base += le64toh(trie->head->node_size);
+ base += node->children_count * le64toh(trie->head->child_entry_size);
+ return (const struct trie_value_entry_f *)base;
}
-static void rstrip(char *n) {
- size_t i;
+static const struct trie_node_f *trie_node_from_off(struct trie_f *trie, le64_t off) {
+ return (const struct trie_node_f *)(trie->map + le64toh(off));
+}
- for (i = strlen(n); i > 0 && isspace(n[i-1]); i--)
- n[i-1] = 0;
+static const char *trie_string(struct trie_f *trie, le64_t off) {
+ return trie->map + le64toh(off);
}
-#define HEXCHARS "0123456789abcdefABCDEF"
-#define WHITESPACE " \t\n\r"
-static int lookup_vid_pid(const char *database,
- uint16_t vid, uint16_t pid,
- char **vendor, char **product)
-{
+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;
- FILE *f;
- int ret = -1;
- int found_vendor = 0;
- char *line = NULL;
+ return n1->c - n2->c;
+}
- *vendor = *product = NULL;
+static const struct trie_node_f *node_lookup_f(struct trie_f *trie, const struct trie_node_f *node, uint8_t c) {
+ struct trie_child_entry_f *child;
+ struct trie_child_entry_f search;
- if (!(f = fopen(database, "rme"))) {
- fprintf(stderr, "Failed to open database file '%s': %s\n", database, strerror(errno));
- return -1;
- }
+ search.c = c;
+ child = bsearch(&search, trie_node_children(trie, node), node->children_count,
+ le64toh(trie->head->child_entry_size), trie_children_cmp_f);
+ if (child)
+ return trie_node_from_off(trie, child->child_off);
+ return NULL;
+}
- for (;;) {
- size_t n;
+static void trie_fnmatch_f(struct trie_f *trie, const struct trie_node_f *node, size_t p,
+ struct linebuf *buf, const char *search,
+ void (*cb)(struct trie_f *trie, const char *key, const char *value)) {
+ size_t len;
+ size_t i;
+ const char *prefix;
- if (getline(&line, &n, f) < 0)
- break;
+ prefix = trie_string(trie, node->prefix_off);
+ len = strlen(prefix + p);
+ linebuf_add(buf, prefix + p, len);
- rstrip(line);
+ for (i = 0; i < node->children_count; i++) {
+ const struct trie_child_entry_f *child = &trie_node_children(trie, node)[i];
- if (line[0] == '#' || line[0] == 0)
- continue;
+ linebuf_add_char(buf, child->c);
+ trie_fnmatch_f(trie, trie_node_from_off(trie, child->child_off), 0, buf, search, cb);
+ linebuf_rem_char(buf);
+ }
- if (strspn(line, HEXCHARS) == 4) {
- unsigned u;
+ if (node->values_count && fnmatch(linebuf_get(buf), search, 0) == 0)
+ for (i = 0; i < node->values_count; i++)
+ cb(trie, trie_string(trie, trie_node_values(trie, node)[i].key_off),
+ trie_string(trie, trie_node_values(trie, node)[i].value_off));
- if (found_vendor)
- break;
+ linebuf_rem(buf, len);
+}
- if (sscanf(line, "%04x", &u) == 1 && u == vid) {
- char *t;
+static void trie_search_f(struct trie_f *trie, const char *search,
+ void (*cb)(struct trie_f *trie, const char *key, const char *value)) {
+ struct linebuf buf;
+ const struct trie_node_f *node;
+ size_t i = 0;
- t = line+4;
- t += strspn(t, WHITESPACE);
+ linebuf_init(&buf);
- if (!(*vendor = strdup(t))) {
- fprintf(stderr, "Out of memory.\n");
- goto finish;
- }
+ node = trie_node_from_off(trie, trie->head->nodes_root_off);
+ while (node) {
+ const struct trie_node_f *child;
+ size_t p = 0;
- found_vendor = 1;
- }
+ if (node->prefix_off) {
+ uint8_t c;
- continue;
+ for (; (c = trie_string(trie, node->prefix_off)[p]); p++) {
+ if (c == '*' || c == '?' || c == '[') {
+ trie_fnmatch_f(trie, node, p, &buf, search + i + p, cb);
+ return;
+ }
+ if (c != search[i + p])
+ return;
+ }
+ i += p;
}
- if (found_vendor && line[0] == '\t' && strspn(line+1, HEXCHARS) == 4) {
- unsigned u;
+ child = node_lookup_f(trie, node, '*');
+ if (child) {
+ linebuf_add_char(&buf, '*');
+ trie_fnmatch_f(trie, child, 0, &buf, search + i, cb);
+ linebuf_rem_char(&buf);
+ }
- if (sscanf(line+1, "%04x", &u) == 1 && u == pid) {
- char *t;
+ child = node_lookup_f(trie, node, '?');
+ if (child) {
+ linebuf_add_char(&buf, '?');
+ trie_fnmatch_f(trie, child, 0, &buf, search + i, cb);
+ linebuf_rem_char(&buf);
+ }
- t = line+5;
- t += strspn(t, WHITESPACE);
+ child = node_lookup_f(trie, node, '[');
+ if (child) {
+ linebuf_add_char(&buf, '[');
+ trie_fnmatch_f(trie, child, 0, &buf, search + i, cb);
+ linebuf_rem_char(&buf);
+ }
- if (!(*product = strdup(t))) {
- fprintf(stderr, "Out of memory.\n");
- goto finish;
- }
+ if (search[i] == '\0') {
+ size_t n;
- break;
- }
+ for (n = 0; n < node->values_count; n++)
+ cb(trie, trie_string(trie, trie_node_values(trie, node)[n].key_off),
+ trie_string(trie, trie_node_values(trie, node)[n].value_off));
+ return;
}
+
+ child = node_lookup_f(trie, node, search[i]);
+ node = child;
+ i++;
}
+}
- ret = 0;
+static void value_cb(struct trie_f *trie, const char *key, const char *value) {
+ /* TODO: add sub-matches (+) against DMI data */
+ if (key[0] == ' ')
+ udev_builtin_add_property(trie->dev, trie->test, key + 1, value);
+}
-finish:
- free(line);
- fclose(f);
+static struct trie_f trie;
- if (ret < 0) {
- free(*product);
- free(*vendor);
+static int hwdb_lookup(struct udev_device *dev, const char *subsys) {
+ struct udev_device *d;
+ const char *modalias;
+ char str[UTIL_NAME_SIZE];
+ int rc = EXIT_SUCCESS;
- *product = *vendor = NULL;
- }
+ /* search the first parent device with a modalias */
+ for (d = dev; d; d = udev_device_get_parent(d)) {
+ const char *dsubsys = udev_device_get_subsystem(d);
- return ret;
-}
+ /* look only at devices of a specific subsystem */
+ if (subsys && dsubsys && !streq(dsubsys, subsys))
+ continue;
-static struct udev_device *find_device(struct udev_device *dev, const char *subsys, const char *devtype)
-{
- const char *str;
-
- str = udev_device_get_subsystem(dev);
- if (str == NULL)
- goto try_parent;
- if (strcmp(str, subsys) != 0)
- goto try_parent;
-
- if (devtype != NULL) {
- str = udev_device_get_devtype(dev);
- if (str == NULL)
- goto try_parent;
- if (strcmp(str, devtype) != 0)
- goto try_parent;
+ modalias = udev_device_get_property_value(d, "MODALIAS");
+ if (modalias)
+ break;
+
+ /* the usb_device does not have modalias, compose one */
+ if (dsubsys && streq(dsubsys, "usb")) {
+ const char *v, *p;
+ int vn, pn;
+
+ v = udev_device_get_sysattr_value(d, "idVendor");
+ if (!v)
+ continue;
+ p = udev_device_get_sysattr_value(d, "idProduct");
+ if (!p)
+ continue;
+ vn = strtol(v, NULL, 16);
+ if (vn <= 0)
+ continue;
+ pn = strtol(p, NULL, 16);
+ if (pn <= 0)
+ continue;
+ snprintf(str, sizeof(str), "usb:v%04Xp%04X*", vn, pn);
+ modalias = str;
+ break;
+ }
}
- return dev;
-try_parent:
- return udev_device_get_parent_with_subsystem_devtype(dev, subsys, devtype);
+ if (!modalias)
+ return EXIT_FAILURE;
+
+ trie_search_f(&trie, modalias, value_cb);
+ return rc;
}
+static int builtin_hwdb(struct udev_device *dev, int argc, char *argv[], bool test) {
+ static const struct option options[] = {
+ { "subsystem", required_argument, NULL, 's' },
+ {}
+ };
+ const char *subsys = NULL;
-static int builtin_db(struct udev_device *dev, bool test,
- const char *database,
- const char *vendor_attr, const char *product_attr,
- const char *subsys, const char *devtype)
-{
- struct udev_device *parent;
- uint16_t vid = 0, pid = 0;
- char *vendor = NULL, *product = NULL;
-
- parent = find_device(dev, subsys, devtype);
- if (!parent) {
- fprintf(stderr, "Failed to find device.\n");
- goto finish;
+ for (;;) {
+ int option;
+
+ option = getopt_long(argc, argv, "s", options, NULL);
+ if (option == -1)
+ break;
+
+ switch (option) {
+ case 's':
+ subsys = optarg;
+ break;
+ }
}
- if (get_vid_pid(parent, vendor_attr, product_attr, &vid, &pid) < 0)
- goto finish;
+ trie.dev = dev;
+ trie.test = test;
+ if (hwdb_lookup(dev, subsys) < 0)
+ return EXIT_FAILURE;
+ return EXIT_SUCCESS;
+}
- if (lookup_vid_pid(database, vid, pid, &vendor, &product) < 0)
- goto finish;
+/* called at udev startup and reload */
+static int builtin_hwdb_init(struct udev *udev)
+{
+ struct stat st;
+ const char sig[] = HWDB_SIG;
+
+ trie.f = fopen(SYSCONFDIR "/udev/hwdb.bin", "re");
+ if (!trie.f)
+ return -errno;
+
+ if (fstat(fileno(trie.f), &st) < 0 || (size_t)st.st_size < offsetof(struct trie_header_f, strings_len) + 8) {
+ log_error("Error reading '%s'.", SYSCONFDIR "/udev/hwdb.bin: %m");
+ fclose(trie.f);
+ zero(trie);
+ return -EINVAL;
+ }
- if (vendor)
- udev_builtin_add_property(dev, test, "ID_VENDOR_FROM_DATABASE", vendor);
- if (product)
- udev_builtin_add_property(dev, test, "ID_MODEL_FROM_DATABASE", product);
+ trie.map = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fileno(trie.f), 0);
+ if (trie.map == MAP_FAILED) {
+ log_error("Error mapping '%s'.", SYSCONFDIR "/udev/hwdb.bin: %m");
+ fclose(trie.f);
+ return -EINVAL;
+ }
+ trie.file_time_usec = ts_usec(&st.st_mtim);
+ trie.map_size = st.st_size;
+
+ if (memcmp(trie.map, sig, sizeof(trie.head->signature)) != 0 || (size_t)st.st_size != le64toh(trie.head->file_size)) {
+ log_error("Unable to recognize the format of '%s'.", SYSCONFDIR "/udev/hwdb.bin");
+ log_error("Please try 'udevadm hwdb --update' to re-create it.");
+ munmap((void *)trie.map, st.st_size);
+ fclose(trie.f);
+ zero(trie);
+ return EINVAL;
+ }
-finish:
- free(vendor);
- free(product);
+ log_debug("=== trie on-disk ===\n");
+ log_debug("tool version: %llu", (unsigned long long)le64toh(trie.head->tool_version));
+ log_debug("file size: %8zi bytes\n", st.st_size);
+ log_debug("header size %8zu bytes\n", (size_t)le64toh(trie.head->header_size));
+ log_debug("strings %8zu bytes\n", (size_t)le64toh(trie.head->strings_len));
+ log_debug("nodes %8zu bytes\n", (size_t)le64toh(trie.head->nodes_len));
return 0;
}
-static int builtin_usb_db(struct udev_device *dev, int argc, char *argv[], bool test)
+/* called on udev shutdown and reload request */
+static void builtin_hwdb_exit(struct udev *udev)
{
- return builtin_db(dev, test, USB_DATABASE, "idVendor", "idProduct", "usb", "usb_device");
+ if (!trie.f)
+ return;
+ munmap((void *)trie.map, trie.map_size);
+ fclose(trie.f);
+ zero(trie);
}
-static int builtin_pci_db(struct udev_device *dev, int argc, char *argv[], bool test)
+/* called every couple of seconds during event activity; 'true' if config has changed */
+static bool builtin_hwdb_validate(struct udev *udev)
{
- return builtin_db(dev, test, PCI_DATABASE, "vendor", "device", "pci", NULL);
-}
+ struct stat st;
-const struct udev_builtin udev_builtin_usb_db = {
- .name = "usb-db",
- .cmd = builtin_usb_db,
- .help = "USB vendor/product database",
- .run_once = true,
-};
+ if (fstat(fileno(trie.f), &st) < 0)
+ return true;
+ if (trie.file_time_usec != ts_usec(&st.st_mtim))
+ return true;
+ return false;
+}
-const struct udev_builtin udev_builtin_pci_db = {
- .name = "pci-db",
- .cmd = builtin_pci_db,
- .help = "PCI vendor/product database",
+const struct udev_builtin udev_builtin_hwdb = {
+ .name = "hwdb",
+ .cmd = builtin_hwdb,
+ .init = builtin_hwdb_init,
+ .exit = builtin_hwdb_exit,
+ .validate = builtin_hwdb_validate,
+ .help = "hardware database",
.run_once = true,
};
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-20 11:05:30 +0000