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-rw-r--r--src/xattr.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/src/xattr.c b/src/xattr.c
new file mode 100644
index 0000000..98a002a
--- /dev/null
+++ b/src/xattr.c
@@ -0,0 +1,95 @@
+/* xattr.h -- POSIX Extended Attribute support.
+
+ Copyright (C) 2016, 2018-2022 Free Software Foundation, Inc.
+
+ This program 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, 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>. */
+
+#include "wget.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include "log.h"
+#include "utils.h"
+#include "xattr.h"
+
+#ifdef USE_XATTR
+
+static int
+write_xattr_metadata (const char *name, const char *value, FILE *fp)
+{
+ int retval = -1;
+
+ if (name && value && fp)
+ {
+ retval = fsetxattr (fileno (fp), name, value, strlen (value), 0);
+ /* FreeBSD's extattr_set_fd returns the length of the extended attribute. */
+ retval = (retval < 0) ? retval : 0;
+ if (retval)
+ DEBUGP (("Failed to set xattr %s.\n", quote(name)));
+ }
+
+ return retval;
+}
+
+#else /* USE_XATTR */
+
+static int
+write_xattr_metadata (const char *name, const char *value, FILE *fp)
+{
+ (void)name;
+ (void)value;
+ (void)fp;
+
+ return 0;
+}
+
+#endif /* USE_XATTR */
+
+int
+set_file_metadata (const struct url *origin_url, const struct url *referrer_url, FILE *fp)
+{
+ /* Save metadata about where the file came from (requested, final URLs) to
+ * user POSIX Extended Attributes of retrieved file.
+ *
+ * For more details about the user namespace see
+ * [http://freedesktop.org/wiki/CommonExtendedAttributes] and
+ * [http://0pointer.de/lennart/projects/mod_mime_xattr/].
+ */
+ int retval = -1;
+ char *value;
+
+ if (!origin_url || !fp)
+ return retval;
+
+ value = url_string (origin_url, URL_AUTH_HIDE);
+ retval = write_xattr_metadata ("user.xdg.origin.url", escnonprint_uri (value), fp);
+ xfree (value);
+
+ if (!retval && referrer_url)
+ {
+ struct url u;
+
+ memset(&u, 0, sizeof(u));
+ u.scheme = referrer_url->scheme;
+ u.host = referrer_url->host;
+ u.port = referrer_url->port;
+
+ value = url_string (&u, 0);
+ retval = write_xattr_metadata ("user.xdg.referrer.url", escnonprint_uri (value), fp);
+ xfree (value);
+ }
+
+ return retval;
+}