163 lines
3.3 KiB
C
163 lines
3.3 KiB
C
/* crypto.c - support crypto autoload */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/mm.h>
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#include <grub/env.h>
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#include <grub/misc.h>
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#include <grub/crypto.h>
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#include <grub/normal.h>
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struct load_spec
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{
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struct load_spec *next;
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char *name;
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char *modname;
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};
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static struct load_spec *crypto_specs = NULL;
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static void
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grub_crypto_autoload (const char *name)
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{
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struct load_spec *cur;
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grub_dl_t mod;
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static int depth = 0;
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/* Some bufio of filesystems may want some crypto modules.
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It may result in infinite recursion. Hence this check. */
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if (depth)
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return;
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depth++;
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for (cur = crypto_specs; cur; cur = cur->next)
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if (grub_strcasecmp (name, cur->name) == 0)
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{
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mod = grub_dl_load (cur->modname);
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if (mod)
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grub_dl_ref (mod);
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grub_errno = GRUB_ERR_NONE;
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}
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depth--;
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}
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static void
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grub_crypto_spec_free (void)
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{
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struct load_spec *cur, *next;
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for (cur = crypto_specs; cur; cur = next)
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{
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next = cur->next;
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grub_free (cur->name);
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grub_free (cur->modname);
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grub_free (cur);
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}
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crypto_specs = NULL;
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}
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/* Read the file crypto.lst for auto-loading. */
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void
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read_crypto_list (const char *prefix)
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{
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char *filename;
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grub_file_t file;
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char *buf = NULL;
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if (!prefix)
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{
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grub_errno = GRUB_ERR_NONE;
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return;
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}
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filename = grub_xasprintf ("%s/" GRUB_TARGET_CPU "-" GRUB_PLATFORM
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"/crypto.lst", prefix);
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if (!filename)
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{
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grub_errno = GRUB_ERR_NONE;
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return;
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}
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file = grub_file_open (filename);
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grub_free (filename);
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if (!file)
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{
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grub_errno = GRUB_ERR_NONE;
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return;
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}
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/* Override previous crypto.lst. */
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grub_crypto_spec_free ();
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for (;; grub_free (buf))
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{
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char *p, *name;
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struct load_spec *cur;
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buf = grub_file_getline (file);
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if (! buf)
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break;
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name = buf;
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while (grub_isspace (name[0]))
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name++;
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p = grub_strchr (name, ':');
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if (! p)
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continue;
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*p = '\0';
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p++;
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while (*p == ' ' || *p == '\t')
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p++;
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cur = grub_malloc (sizeof (*cur));
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if (!cur)
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{
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grub_errno = GRUB_ERR_NONE;
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continue;
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}
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cur->name = grub_strdup (name);
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if (! cur->name)
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{
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grub_errno = GRUB_ERR_NONE;
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grub_free (cur);
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continue;
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}
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cur->modname = grub_strdup (p);
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if (! cur->modname)
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{
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grub_errno = GRUB_ERR_NONE;
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grub_free (cur->name);
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grub_free (cur);
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continue;
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}
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cur->next = crypto_specs;
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crypto_specs = cur;
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}
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grub_file_close (file);
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grub_errno = GRUB_ERR_NONE;
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grub_crypto_autoload_hook = grub_crypto_autoload;
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}
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