/* SPDX-License-Identifier: LGPL-2.1+ */ /*** This file is part of systemd. Copyright 2012 Kay Sievers 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 . ***/ #include #include #include #include #include "sd-hwdb.h" #include "alloc-util.h" #include "hwdb-util.h" #include "string-util.h" #include "udev-util.h" #include "udev.h" static sd_hwdb *hwdb; int udev_builtin_hwdb_lookup(struct udev_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; 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; if (udev_builtin_add_property(dev, test, key, value) < 0) return -ENOMEM; n++; } return n; } static const char *modalias_usb(struct udev_device *dev, char *s, size_t size) { const char *v, *p; int vn, pn; v = udev_device_get_sysattr_value(dev, "idVendor"); if (!v) return NULL; p = udev_device_get_sysattr_value(dev, "idProduct"); if (!p) return NULL; vn = strtol(v, NULL, 16); if (vn <= 0) return NULL; pn = strtol(p, NULL, 16); if (pn <= 0) return NULL; snprintf(s, size, "usb:v%04Xp%04X*", vn, pn); return s; } static int udev_builtin_hwdb_search(struct udev_device *dev, struct udev_device *srcdev, const char *subsystem, const char *prefix, const char *filter, bool test) { struct udev_device *d; char s[16]; bool last = false; int r = 0; assert(dev); if (!srcdev) srcdev = dev; for (d = srcdev; d && !last; d = udev_device_get_parent(d)) { const char *dsubsys; const char *modalias = NULL; dsubsys = udev_device_get_subsystem(d); if (!dsubsys) continue; /* look only at devices of a specific subsystem */ if (subsystem && !streq(dsubsys, subsystem)) continue; modalias = udev_device_get_property_value(d, "MODALIAS"); if (streq(dsubsys, "usb") && streq_ptr(udev_device_get_devtype(d), "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) continue; r = udev_builtin_hwdb_lookup(dev, prefix, modalias, filter, test); if (r > 0) break; } return r; } static int builtin_hwdb(struct udev_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_udev_device_unref_ struct udev_device *srcdev = NULL; if (!hwdb) return EXIT_FAILURE; 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]) { if (udev_builtin_hwdb_lookup(dev, prefix, argv[optind], filter, test) > 0) return EXIT_SUCCESS; return EXIT_FAILURE; } /* read data from another device than the device we will store the data */ if (device) { srcdev = udev_device_new_from_device_id(udev_device_get_udev(dev), device); if (!srcdev) return EXIT_FAILURE; } if (udev_builtin_hwdb_search(dev, srcdev, subsystem, prefix, filter, test) > 0) return EXIT_SUCCESS; return EXIT_FAILURE; } /* called at udev startup and reload */ static int builtin_hwdb_init(struct udev *udev) { 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(struct udev *udev) { hwdb = sd_hwdb_unref(hwdb); } /* called every couple of seconds during event activity; 'true' if config has changed */ static bool builtin_hwdb_validate(struct udev *udev) { 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", };