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/* hwmatch.c - Match hardware against a whitelist/blacklist. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2011 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/command.h>
#include <grub/pci.h>
#include <grub/normal.h>
#include <grub/file.h>
#include <grub/env.h>
#include <grub/i18n.h>
#include <regex.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* Context for grub_cmd_hwmatch. */
struct hwmatch_ctx
{
grub_file_t matches_file;
int class_match;
int match;
};
/* Helper for grub_cmd_hwmatch. */
static int
hwmatch_iter (grub_pci_device_t dev, grub_pci_id_t pciid, void *data)
{
struct hwmatch_ctx *ctx = data;
grub_pci_address_t addr;
grub_uint32_t class, baseclass, vendor, device;
grub_pci_id_t subpciid;
grub_uint32_t subvendor, subdevice, subclass;
char *id, *line;
addr = grub_pci_make_address (dev, GRUB_PCI_REG_CLASS);
class = grub_pci_read (addr);
baseclass = class >> 24;
if (ctx->class_match != baseclass)
return 0;
vendor = pciid & 0xffff;
device = pciid >> 16;
addr = grub_pci_make_address (dev, GRUB_PCI_REG_SUBVENDOR);
subpciid = grub_pci_read (addr);
subclass = (class >> 16) & 0xff;
subvendor = subpciid & 0xffff;
subdevice = subpciid >> 16;
id = grub_xasprintf ("v%04xd%04xsv%04xsd%04xbc%02xsc%02x",
vendor, device, subvendor, subdevice,
baseclass, subclass);
grub_file_seek (ctx->matches_file, 0);
while ((line = grub_file_getline (ctx->matches_file)) != NULL)
{
char *anchored_line;
regex_t regex;
int ret;
if (! *line || *line == '#')
{
grub_free (line);
continue;
}
anchored_line = grub_xasprintf ("^%s$", line);
ret = regcomp (®ex, anchored_line, REG_EXTENDED | REG_NOSUB);
grub_free (anchored_line);
if (ret)
{
grub_free (line);
continue;
}
ret = regexec (®ex, id, 0, NULL, 0);
regfree (®ex);
grub_free (line);
if (! ret)
{
ctx->match = 1;
return 1;
}
}
return 0;
}
static grub_err_t
grub_cmd_hwmatch (grub_command_t cmd __attribute__ ((unused)),
int argc, char **args)
{
struct hwmatch_ctx ctx = { .match = 0 };
char *match_str;
if (argc < 2)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "list file and class required");
ctx.matches_file = grub_file_open (args[0], GRUB_FILE_TYPE_HWMATCH);
if (! ctx.matches_file)
return grub_errno;
ctx.class_match = grub_strtol (args[1], 0, 10);
grub_pci_iterate (hwmatch_iter, &ctx);
match_str = grub_xasprintf ("%d", ctx.match);
grub_env_set ("match", match_str);
grub_free (match_str);
grub_file_close (ctx.matches_file);
return GRUB_ERR_NONE;
}
static grub_command_t cmd;
GRUB_MOD_INIT(hwmatch)
{
cmd = grub_register_command ("hwmatch", grub_cmd_hwmatch,
N_("MATCHES-FILE CLASS"),
N_("Match PCI devices."));
}
GRUB_MOD_FINI(hwmatch)
{
grub_unregister_command (cmd);
}
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