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/*
Copyright (C) 2006 Andreas Gruenbacher <agruen@suse.de>, SuSE Linux AG.
This program 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.
This program 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 this manual. If not, see <http://www.gnu.org/licenses/>.
*/
#include <alloca.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdarg.h>
#include <fnmatch.h>
#include "attr/libattr.h"
#define ERROR_CONTEXT_MACROS
#include "error_context.h"
#define ATTR_CONF "/etc/xattr.conf"
struct attr_action {
struct attr_action *next;
char *pattern;
int action;
};
static struct attr_action *attr_actions;
static void
free_attr_actions(void)
{
struct attr_action *tmp;
while (attr_actions) {
tmp = attr_actions->next;
free(attr_actions->pattern);
free(attr_actions);
attr_actions = tmp;
}
}
static int
attr_parse_attr_conf(struct error_context *ctx)
{
char *text = NULL, *t;
size_t size_guess = 4096, len;
FILE *file;
char *pattern = NULL;
struct attr_action *new;
int action;
if (attr_actions)
return 0;
repeat:
if ((file = fopen(ATTR_CONF, "r")) == NULL) {
if (errno == ENOENT)
return 0;
goto fail;
}
text = malloc(size_guess + 1);
if (!text)
goto fail;
len = fread(text, 1, size_guess, file);
if (ferror(file))
goto fail;
if (!feof(file)) {
fclose(file);
file = NULL;
free(text);
text = NULL;
size_guess *= 2;
goto repeat;
}
fclose(file);
file = NULL;
text[len] = 0;
t = text;
for (;;) {
t += strspn(t, " \t\n");
len = strcspn(t, " \t\n#");
if (t[len] == '#') {
if (len)
goto parse_error;
t += strcspn(t, "\n");
continue;
} else if (t[len] == 0)
break;
else if (t[len] == '\n')
goto parse_error;
pattern = strndup(t, len);
if (!pattern)
goto fail;
t += len;
t += strspn(t, " \t");
len = strcspn(t, " \t\n#");
if (len == 4 && !strncmp(t, "skip", 4))
action = ATTR_ACTION_SKIP;
else if (len == 11 && !strncmp(t, "permissions", 11))
action = ATTR_ACTION_PERMISSIONS;
else
goto parse_error;
t += len;
t += strspn(t, " \t");
if (*t != '#' && *t != '\n')
goto parse_error;
new = malloc(sizeof(struct attr_action));
if (!new)
goto parse_error;
new->next = attr_actions;
new->pattern = pattern;
new->action = action;
attr_actions = new;
t += strcspn(t, "\n");
}
free(text);
return 0;
parse_error:
errno = EINVAL;
fail:
{
const char *q = quote (ctx, ATTR_CONF);
error (ctx, "%s", q);
quote_free (ctx, q);
}
free(pattern);
if (file)
fclose(file);
free(text);
free_attr_actions();
return -1;
}
int
attr_copy_action(const char *name, struct error_context *ctx)
{
struct attr_action *action = attr_actions;
if (!attr_parse_attr_conf(ctx)) {
for (action = attr_actions; action; action = action->next) {
if (!fnmatch(action->pattern, name, 0))
return action->action;
}
}
return 0;
}
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