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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fnmatch.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include "sd-hwdb.h"
#include "alloc-util.h"
#include "device-util.h"
#include "hwdb-util.h"
#include "parse-util.h"
#include "string-util.h"
#include "udev-builtin.h"
static sd_hwdb *hwdb;
int udev_builtin_hwdb_lookup(sd_device *dev,
const char *prefix, const char *modalias,
const char *filter, bool test) {
_cleanup_free_ char *lookup = NULL;
const char *key, *value;
int n = 0, r;
if (!hwdb)
return -ENOENT;
if (prefix) {
lookup = strjoin(prefix, modalias);
if (!lookup)
return -ENOMEM;
modalias = lookup;
}
SD_HWDB_FOREACH_PROPERTY(hwdb, modalias, key, value) {
if (filter && fnmatch(filter, key, FNM_NOESCAPE) != 0)
continue;
r = udev_builtin_add_property(dev, test, key, value);
if (r < 0)
return r;
n++;
}
return n;
}
static const char *modalias_usb(sd_device *dev, char *s, size_t size) {
const char *v, *p, *n = NULL;
uint16_t vn, pn;
if (sd_device_get_sysattr_value(dev, "idVendor", &v) < 0)
return NULL;
if (sd_device_get_sysattr_value(dev, "idProduct", &p) < 0)
return NULL;
if (safe_atoux16(v, &vn) < 0)
return NULL;
if (safe_atoux16(p, &pn) < 0)
return NULL;
(void) sd_device_get_sysattr_value(dev, "product", &n);
(void) snprintf(s, size, "usb:v%04Xp%04X:%s", vn, pn, strempty(n));
return s;
}
static int udev_builtin_hwdb_search(sd_device *dev, sd_device *srcdev,
const char *subsystem, const char *prefix,
const char *filter, bool test) {
char s[LINE_MAX];
bool last = false;
int r = 0;
assert(dev);
if (!srcdev)
srcdev = dev;
for (sd_device *d = srcdev; d; ) {
const char *dsubsys, *devtype, *modalias = NULL;
if (sd_device_get_subsystem(d, &dsubsys) < 0)
goto next;
/* look only at devices of a specific subsystem */
if (subsystem && !streq(dsubsys, subsystem))
goto next;
(void) sd_device_get_property_value(d, "MODALIAS", &modalias);
if (streq(dsubsys, "usb") &&
sd_device_get_devtype(d, &devtype) >= 0 &&
streq(devtype, "usb_device")) {
/* if the usb_device does not have a modalias, compose one */
if (!modalias)
modalias = modalias_usb(d, s, sizeof(s));
/* avoid looking at any parent device, they are usually just a USB hub */
last = true;
}
if (!modalias)
goto next;
log_device_debug(dev, "hwdb modalias key: \"%s\"", modalias);
r = udev_builtin_hwdb_lookup(dev, prefix, modalias, filter, test);
if (r > 0)
break;
if (last)
break;
next:
if (sd_device_get_parent(d, &d) < 0)
break;
}
return r;
}
static int builtin_hwdb(UdevEvent *event, int argc, char *argv[], bool test) {
static const struct option options[] = {
{ "filter", required_argument, NULL, 'f' },
{ "device", required_argument, NULL, 'd' },
{ "subsystem", required_argument, NULL, 's' },
{ "lookup-prefix", required_argument, NULL, 'p' },
{}
};
const char *filter = NULL;
const char *device = NULL;
const char *subsystem = NULL;
const char *prefix = NULL;
_cleanup_(sd_device_unrefp) sd_device *srcdev = NULL;
sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
int r;
if (!hwdb)
return -EINVAL;
for (;;) {
int option;
option = getopt_long(argc, argv, "f:d:s:p:", options, NULL);
if (option == -1)
break;
switch (option) {
case 'f':
filter = optarg;
break;
case 'd':
device = optarg;
break;
case 's':
subsystem = optarg;
break;
case 'p':
prefix = optarg;
break;
}
}
/* query a specific key given as argument */
if (argv[optind]) {
r = udev_builtin_hwdb_lookup(dev, prefix, argv[optind], filter, test);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to look up hwdb: %m");
if (r == 0)
return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENODATA), "No entry found from hwdb.");
return r;
}
/* read data from another device than the device we will store the data */
if (device) {
r = sd_device_new_from_device_id(&srcdev, device);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to create sd_device object '%s': %m", device);
}
r = udev_builtin_hwdb_search(dev, srcdev, subsystem, prefix, filter, test);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to look up hwdb: %m");
if (r == 0)
return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENODATA), "No entry found from hwdb.");
return r;
}
/* called at udev startup and reload */
static int builtin_hwdb_init(void) {
int r;
if (hwdb)
return 0;
r = sd_hwdb_new(&hwdb);
if (r < 0)
return r;
return 0;
}
/* called on udev shutdown and reload request */
static void builtin_hwdb_exit(void) {
hwdb = sd_hwdb_unref(hwdb);
}
/* called every couple of seconds during event activity; 'true' if config has changed */
static bool builtin_hwdb_should_reload(void) {
if (hwdb_should_reload(hwdb)) {
log_debug("hwdb needs reloading.");
return true;
}
return false;
}
const UdevBuiltin udev_builtin_hwdb = {
.name = "hwdb",
.cmd = builtin_hwdb,
.init = builtin_hwdb_init,
.exit = builtin_hwdb_exit,
.should_reload = builtin_hwdb_should_reload,
.help = "Hardware database",
};
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