Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/src/udev/udev-builtin-hwdb.c b/src/udev/udev-builtin-hwdb.c
new file mode 100644
index 0000000..225e026
--- /dev/null
+++ b/src/udev/udev-builtin-hwdb.c
@@ -0,0 +1,218 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#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;
+        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;
+        snprintf(s, size, "usb:v%04Xp%04X*", vn, pn);
+        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) {
+        sd_device *d;
+        char s[16];
+        bool last = false;
+        int r = 0;
+
+        assert(dev);
+
+        if (!srcdev)
+                srcdev = dev;
+
+        for (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;
+
+                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(sd_device *dev, 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;
+        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 lookup 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 lookup 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_validate(void) {
+        return hwdb_validate(hwdb);
+}
+
+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",
+};