src/udev/udev-builtin-firmware.c

   1 /*
   2  * firmware - Kernel firmware loader
   3  *
   4  * Copyright (C) 2009 Piter Punk <piterpunk@slackware.com>
   5  * Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details:*
  16  */
  17
  18 #include <unistd.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <getopt.h>
  23 #include <errno.h>
  24 #include <stdbool.h>
  25 #include <sys/utsname.h>
  26 #include <sys/stat.h>
  27
  28 #include "udev.h"
  29
  30 static bool set_loading(struct udev *udev, char *loadpath, const char *state)
  31 {
  32         FILE *ldfile;
  33
  34         ldfile = fopen(loadpath, "we");
  35         if (ldfile == NULL) {
  36                 log_error("error: can not open '%s'\n", loadpath);
  37                 return false;
  38         };
  39         fprintf(ldfile, "%s\n", state);
  40         fclose(ldfile);
  41         return true;
  42 }
  43
  44 static bool copy_firmware(struct udev *udev, const char *source, const char *target, size_t size)
  45 {
  46         char *buf;
  47         FILE *fsource = NULL, *ftarget = NULL;
  48         bool ret = false;
  49
  50         buf = malloc(size);
  51         if (buf == NULL) {
  52                 log_error("No memory available to load firmware file");
  53                 return false;
  54         }
  55
  56         log_debug("writing '%s' (%zi) to '%s'\n", source, size, target);
  57
  58         fsource = fopen(source, "re");
  59         if (fsource == NULL)
  60                 goto exit;
  61         ftarget = fopen(target, "we");
  62         if (ftarget == NULL)
  63                 goto exit;
  64         if (fread(buf, size, 1, fsource) != 1)
  65                 goto exit;
  66         if (fwrite(buf, size, 1, ftarget) == 1)
  67                 ret = true;
  68 exit:
  69         if (ftarget != NULL)
  70                 fclose(ftarget);
  71         if (fsource != NULL)
  72                 fclose(fsource);
  73         free(buf);
  74         return ret;
  75 }
  76
  77 static int builtin_firmware(struct udev_device *dev, int argc, char *argv[], bool test)
  78 {
  79         struct udev *udev = udev_device_get_udev(dev);
  80         static const char *searchpath[] = { FIRMWARE_PATH };
  81         char fwencpath[UTIL_PATH_SIZE];
  82         char misspath[UTIL_PATH_SIZE];
  83         char loadpath[UTIL_PATH_SIZE];
  84         char datapath[UTIL_PATH_SIZE];
  85         char fwpath[UTIL_PATH_SIZE];
  86         const char *firmware;
  87         FILE *fwfile = NULL;
  88         struct utsname kernel;
  89         struct stat statbuf;
  90         unsigned int i;
  91         int rc = EXIT_SUCCESS;
  92
  93         firmware = udev_device_get_property_value(dev, "FIRMWARE");
  94         if (firmware == NULL) {
  95                 log_error("firmware parameter missing\n\n");
  96                 rc = EXIT_FAILURE;
  97                 goto exit;
  98         }
  99
 100         /* lookup firmware file */
 101         uname(&kernel);
 102         for (i = 0; i < ELEMENTSOF(searchpath); i++) {
 103                 strscpyl(fwpath, sizeof(fwpath), searchpath[i], kernel.release, "/", firmware, NULL);
 104                 fwfile = fopen(fwpath, "re");
 105                 if (fwfile != NULL)
 106                         break;
 107
 108                 strscpyl(fwpath, sizeof(fwpath), searchpath[i], firmware, NULL);
 109                 fwfile = fopen(fwpath, "re");
 110                 if (fwfile != NULL)
 111                         break;
 112         }
 113
 114         util_path_encode(firmware, fwencpath, sizeof(fwencpath));
 115         strscpyl(misspath, sizeof(misspath), "/run/udev/firmware-missing/", fwencpath, NULL);
 116         strscpyl(loadpath, sizeof(loadpath), udev_device_get_syspath(dev), "/loading", NULL);
 117
 118         if (fwfile == NULL) {
 119                 int err;
 120
 121                 /* This link indicates the missing firmware file and the associated device */
 122                 log_debug("did not find firmware file '%s'\n", firmware);
 123                 do {
 124                         err = mkdir_parents(misspath, 0755);
 125                         if (err != 0 && err != -ENOENT)
 126                                 break;
 127                         err = symlink(udev_device_get_devpath(dev), misspath);
 128                         if (err != 0)
 129                                 err = -errno;
 130                 } while (err == -ENOENT);
 131                 rc = EXIT_FAILURE;
 132                 /*
 133                  * Do not cancel the request in the initrd, the real root might have
 134                  * the firmware file and the 'coldplug' run in the real root will find
 135                  * this pending request and fulfill or cancel it.
 136                  * */
 137                 if (!in_initrd())
 138                         set_loading(udev, loadpath, "-1");
 139                 goto exit;
 140         }
 141
 142         if (stat(fwpath, &statbuf) < 0 || statbuf.st_size == 0) {
 143                 if (!in_initrd())
 144                         set_loading(udev, loadpath, "-1");
 145                 rc = EXIT_FAILURE;
 146                 goto exit;
 147         }
 148
 149         if (unlink(misspath) == 0)
 150                 util_delete_path(udev, misspath);
 151
 152         if (!set_loading(udev, loadpath, "1"))
 153                 goto exit;
 154
 155         strscpyl(datapath, sizeof(datapath), udev_device_get_syspath(dev), "/data", NULL);
 156         if (!copy_firmware(udev, fwpath, datapath, statbuf.st_size)) {
 157                 log_error("error sending firmware '%s' to device\n", firmware);
 158                 set_loading(udev, loadpath, "-1");
 159                 rc = EXIT_FAILURE;
 160                 goto exit;
 161         };
 162
 163         set_loading(udev, loadpath, "0");
 164 exit:
 165         if (fwfile)
 166                 fclose(fwfile);
 167         return rc;
 168 }
 169
 170 const struct udev_builtin udev_builtin_firmware = {
 171         .name = "firmware",
 172         .cmd = builtin_firmware,
 173         .help = "kernel firmware loader",
 174         .run_once = true,
 175 };