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/*
* Copyright 2016 Red Hat, Inc.
* Copyright 2016-2022 Collabora Ltd.
* Copyright 2017-2022 Endless OS Foundation, LLC
* Copyright 2018 Will Thompson
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "gjournal-private.h"
#if defined(__linux__) && !defined(__BIONIC__)
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
/*
* Reimplementation of g_str_has_prefix(), necessary when compiled into
* gio-launch-desktop.
*/
static int
str_has_prefix (const char *str,
const char *prefix)
{
return strncmp (str, prefix, strlen (prefix)) == 0;
}
/*
* _g_fd_is_journal:
* @output_fd: output file descriptor to check
*
* Same as g_log_writer_is_journald(), but with no GLib dependencies.
*
* Returns: 1 if @output_fd points to the journal, 0 otherwise
*/
int
_g_fd_is_journal (int output_fd)
{
/* FIXME: Use the new journal API for detecting whether we’re writing to the
* journal. See: https://github.com/systemd/systemd/issues/2473
*/
union {
struct sockaddr_storage storage;
struct sockaddr sa;
struct sockaddr_un un;
} addr;
socklen_t addr_len;
int err;
if (output_fd < 0)
return 0;
/* Namespaced journals start with `/run/systemd/journal.${name}/` (see
* `RuntimeDirectory=systemd/journal.%i` in `systemd-journald@.service`. The
* default journal starts with `/run/systemd/journal/`. */
memset (&addr, 0, sizeof (addr));
addr_len = sizeof(addr);
err = getpeername (output_fd, &addr.sa, &addr_len);
if (err == 0 && addr.storage.ss_family == AF_UNIX)
return (str_has_prefix (addr.un.sun_path, "/run/systemd/journal/") ||
str_has_prefix (addr.un.sun_path, "/run/systemd/journal."));
return 0;
}
#endif
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