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-rw-r--r--grub-core/commands/wildcard.c495
1 files changed, 495 insertions, 0 deletions
diff --git a/grub-core/commands/wildcard.c b/grub-core/commands/wildcard.c
new file mode 100644
index 0000000..32561ab
--- /dev/null
+++ b/grub-core/commands/wildcard.c
@@ -0,0 +1,495 @@
+/* wildcard.c - Wildcard character expansion for GRUB script. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2010 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/mm.h>
+#include <grub/fs.h>
+#include <grub/env.h>
+#include <grub/file.h>
+#include <grub/device.h>
+#include <grub/script_sh.h>
+
+#include <regex.h>
+
+static inline int isregexop (char ch);
+static char ** merge (char **lhs, char **rhs);
+static char *make_dir (const char *prefix, const char *start, const char *end);
+static int make_regex (const char *regex_start, const char *regex_end,
+ regex_t *regexp);
+static void split_path (const char *path, const char **suffix_end, const char **regex_end);
+static char ** match_devices (const regex_t *regexp, int noparts);
+static char ** match_files (const char *prefix, const char *suffix_start,
+ const char *suffix_end, const regex_t *regexp);
+
+static char* wildcard_escape (const char *s);
+static char* wildcard_unescape (const char *s);
+static grub_err_t wildcard_expand (const char *s, char ***strs);
+
+struct grub_script_wildcard_translator grub_filename_translator = {
+ .expand = wildcard_expand,
+ .escape = wildcard_escape,
+ .unescape = wildcard_unescape
+};
+
+static char **
+merge (char **dest, char **ps)
+{
+ int i;
+ int j;
+ char **p;
+
+ if (! dest)
+ return ps;
+
+ if (! ps)
+ return dest;
+
+ for (i = 0; dest[i]; i++)
+ ;
+ for (j = 0; ps[j]; j++)
+ ;
+
+ p = grub_realloc (dest, sizeof (char*) * (i + j + 1));
+ if (! p)
+ {
+ grub_free (dest);
+ grub_free (ps);
+ return 0;
+ }
+
+ dest = p;
+ for (j = 0; ps[j]; j++)
+ dest[i++] = ps[j];
+ dest[i] = 0;
+
+ grub_free (ps);
+ return dest;
+}
+
+static inline int
+isregexop (char ch)
+{
+ return grub_strchr ("*.\\", ch) ? 1 : 0;
+}
+
+static char *
+make_dir (const char *prefix, const char *start, const char *end)
+{
+ char ch;
+ unsigned i;
+ unsigned n;
+ char *result;
+
+ i = grub_strlen (prefix);
+ n = i + end - start;
+
+ result = grub_malloc (n + 1);
+ if (! result)
+ return 0;
+
+ grub_strcpy (result, prefix);
+ while (start < end && (ch = *start++))
+ if (ch == '\\' && isregexop (*start))
+ result[i++] = *start++;
+ else
+ result[i++] = ch;
+
+ result[i] = '\0';
+ return result;
+}
+
+static int
+make_regex (const char *start, const char *end, regex_t *regexp)
+{
+ char ch;
+ int i = 0;
+ unsigned len = end - start;
+ char *buffer = grub_malloc (len * 2 + 2 + 1); /* worst case size. */
+
+ if (! buffer)
+ return 1;
+
+ buffer[i++] = '^';
+ while (start < end)
+ {
+ /* XXX Only * expansion for now. */
+ switch ((ch = *start++))
+ {
+ case '\\':
+ buffer[i++] = ch;
+ if (*start != '\0')
+ buffer[i++] = *start++;
+ break;
+
+ case '.':
+ case '(':
+ case ')':
+ buffer[i++] = '\\';
+ buffer[i++] = ch;
+ break;
+
+ case '*':
+ buffer[i++] = '.';
+ buffer[i++] = '*';
+ break;
+
+ default:
+ buffer[i++] = ch;
+ }
+ }
+ buffer[i++] = '$';
+ buffer[i] = '\0';
+ grub_dprintf ("expand", "Regexp is %s\n", buffer);
+
+ if (regcomp (regexp, buffer, RE_SYNTAX_GNU_AWK))
+ {
+ grub_free (buffer);
+ return 1;
+ }
+
+ grub_free (buffer);
+ return 0;
+}
+
+/* Split `str' into two parts: (1) dirname that is regexop free (2)
+ dirname that has a regexop. */
+static void
+split_path (const char *str, const char **noregexop, const char **regexop)
+{
+ char ch = 0;
+ int regex = 0;
+
+ const char *end;
+ const char *split; /* points till the end of dirnaname that doesn't
+ need expansion. */
+
+ split = end = str;
+ while ((ch = *end))
+ {
+ if (ch == '\\' && end[1])
+ end++;
+
+ else if (isregexop (ch))
+ regex = 1;
+
+ else if (ch == '/' && ! regex)
+ split = end + 1; /* forward to next regexop-free dirname */
+
+ else if (ch == '/' && regex)
+ break; /* stop at the first dirname with a regexop */
+
+ end++;
+ }
+
+ *regexop = end;
+ if (! regex)
+ *noregexop = end;
+ else
+ *noregexop = split;
+}
+
+static char **
+match_devices (const regex_t *regexp, int noparts)
+{
+ int i;
+ int ndev;
+ char **devs;
+
+ auto int match (const char *name);
+ int match (const char *name)
+ {
+ char **t;
+ char *buffer;
+
+ /* skip partitions if asked to. */
+ if (noparts && grub_strchr(name, ','))
+ return 0;
+
+ buffer = grub_xasprintf ("(%s)", name);
+ if (! buffer)
+ return 1;
+
+ grub_dprintf ("expand", "matching: %s\n", buffer);
+ if (regexec (regexp, buffer, 0, 0, 0))
+ {
+ grub_dprintf ("expand", "not matched\n");
+ grub_free (buffer);
+ return 0;
+ }
+
+ t = grub_realloc (devs, sizeof (char*) * (ndev + 2));
+ if (! t)
+ return 1;
+
+ devs = t;
+ devs[ndev++] = buffer;
+ devs[ndev] = 0;
+ return 0;
+ }
+
+ ndev = 0;
+ devs = 0;
+
+ if (grub_device_iterate (match))
+ goto fail;
+
+ return devs;
+
+ fail:
+
+ for (i = 0; devs && devs[i]; i++)
+ grub_free (devs[i]);
+
+ if (devs)
+ grub_free (devs);
+
+ return 0;
+}
+
+static char **
+match_files (const char *prefix, const char *suffix, const char *end,
+ const regex_t *regexp)
+{
+ int i;
+ char **files;
+ unsigned nfile;
+ char *dir;
+ const char *path;
+ char *device_name;
+ grub_fs_t fs;
+ grub_device_t dev;
+
+ auto int match (const char *name, const struct grub_dirhook_info *info);
+ int match (const char *name, const struct grub_dirhook_info *info)
+ {
+ char **t;
+ char *buffer;
+
+ /* skip . and .. names */
+ if (grub_strcmp(".", name) == 0 || grub_strcmp("..", name) == 0)
+ return 0;
+
+ grub_dprintf ("expand", "matching: %s in %s\n", name, dir);
+ if (regexec (regexp, name, 0, 0, 0))
+ return 0;
+
+ buffer = grub_xasprintf ("%s%s", dir, name);
+ if (! buffer)
+ return 1;
+
+ t = grub_realloc (files, sizeof (char*) * (nfile + 2));
+ if (! t)
+ {
+ grub_free (buffer);
+ return 1;
+ }
+
+ files = t;
+ files[nfile++] = buffer;
+ files[nfile] = 0;
+ return 0;
+ }
+
+ nfile = 0;
+ files = 0;
+ dev = 0;
+ device_name = 0;
+ grub_error_push ();
+
+ dir = make_dir (prefix, suffix, end);
+ if (! dir)
+ goto fail;
+
+ device_name = grub_file_get_device_name (dir);
+ dev = grub_device_open (device_name);
+ if (! dev)
+ goto fail;
+
+ fs = grub_fs_probe (dev);
+ if (! fs)
+ goto fail;
+
+ path = grub_strchr (dir, ')');
+ if (! path)
+ goto fail;
+ path++;
+
+ if (fs->dir (dev, path, match))
+ goto fail;
+
+ grub_free (dir);
+ grub_device_close (dev);
+ grub_free (device_name);
+ grub_error_pop ();
+ return files;
+
+ fail:
+
+ if (dir)
+ grub_free (dir);
+
+ for (i = 0; files && files[i]; i++)
+ grub_free (files[i]);
+
+ if (files)
+ grub_free (files);
+
+ if (dev)
+ grub_device_close (dev);
+
+ if (device_name)
+ grub_free (device_name);
+
+ grub_error_pop ();
+ return 0;
+}
+
+static char*
+wildcard_escape (const char *s)
+{
+ int i;
+ int len;
+ char ch;
+ char *p;
+
+ len = grub_strlen (s);
+ p = grub_malloc (len * 2 + 1);
+ if (! p)
+ return NULL;
+
+ i = 0;
+ while ((ch = *s++))
+ {
+ if (isregexop (ch))
+ p[i++] = '\\';
+ p[i++] = ch;
+ }
+ p[i] = '\0';
+ return p;
+}
+
+static char*
+wildcard_unescape (const char *s)
+{
+ int i;
+ int len;
+ char ch;
+ char *p;
+
+ len = grub_strlen (s);
+ p = grub_malloc (len + 1);
+ if (! p)
+ return NULL;
+
+ i = 0;
+ while ((ch = *s++))
+ {
+ if (ch == '\\' && isregexop (*s))
+ p[i++] = *s++;
+ else
+ p[i++] = ch;
+ }
+ p[i] = '\0';
+ return p;
+}
+
+static grub_err_t
+wildcard_expand (const char *s, char ***strs)
+{
+ const char *start;
+ const char *regexop;
+ const char *noregexop;
+ char **paths = 0;
+
+ unsigned i;
+ regex_t regexp;
+
+ start = s;
+ while (*start)
+ {
+ split_path (start, &noregexop, &regexop);
+ if (noregexop >= regexop) /* no more wildcards */
+ break;
+
+ if (make_regex (noregexop, regexop, &regexp))
+ goto fail;
+
+ if (paths == 0)
+ {
+ if (start == noregexop) /* device part has regexop */
+ paths = match_devices (&regexp, *start != '(');
+
+ else if (*start == '(') /* device part explicit wo regexop */
+ paths = match_files ("", start, noregexop, &regexp);
+
+ else if (*start == '/') /* no device part */
+ {
+ char *root;
+ char *prefix;
+
+ root = grub_env_get ("root");
+ if (! root)
+ goto fail;
+
+ prefix = grub_xasprintf ("(%s)", root);
+ if (! prefix)
+ goto fail;
+
+ paths = match_files (prefix, start, noregexop, &regexp);
+ grub_free (prefix);
+ }
+ }
+ else
+ {
+ char **r = 0;
+
+ for (i = 0; paths[i]; i++)
+ {
+ char **p;
+
+ p = match_files (paths[i], start, noregexop, &regexp);
+ if (! p)
+ continue;
+
+ r = merge (r, p);
+ if (! r)
+ goto fail;
+ }
+ paths = r;
+ }
+
+ regfree (&regexp);
+ if (! paths)
+ goto done;
+
+ start = regexop;
+ }
+
+ done:
+
+ *strs = paths;
+ return 0;
+
+ fail:
+
+ for (i = 0; paths && paths[i]; i++)
+ grub_free (paths[i]);
+ grub_free (paths);
+ regfree (&regexp);
+ return grub_errno;
+}
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