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/*
* Copyright (c) 2002-2014 Balabit
* Copyright (c) 2013-2014 Tibor Benke
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "systemd-syslog-source.h"
#include "afunix-source.h"
#include "afsocket-systemd-override.h"
#include "service-management.h"
#include "fdhelpers.h"
#include <stdlib.h>
#include <unistd.h>
#if SYSLOG_NG_ENABLE_SYSTEMD
#include <systemd/sd-daemon.h>
static gboolean
systemd_syslog_sd_acquire_socket(AFSocketSourceDriver *s,
gint *acquired_fd)
{
*acquired_fd = -1;
gint number_of_fds = sd_listen_fds(0);
if (number_of_fds > 1)
{
msg_error("Systemd socket activation failed: got more than one fd",
evt_tag_int("number", number_of_fds));
return TRUE;
}
else if (number_of_fds < 1)
{
msg_error("Failed to acquire /run/systemd/journal/syslog socket, disabling systemd-syslog source");
return TRUE;
}
else
{
gint fd = SD_LISTEN_FDS_START;
msg_debug("Systemd socket activation",
evt_tag_int("file-descriptor", fd));
if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, NULL, 0))
{
*acquired_fd = fd;
}
else
{
msg_error("The systemd supplied UNIX domain socket is of a"
" different type, check the configured driver and"
" the matching systemd unit file",
evt_tag_int("systemd-sock-fd", fd),
evt_tag_str("expecting", "unix-dgram()"));
*acquired_fd = -1;
return TRUE;
}
}
if (*acquired_fd != -1)
{
g_fd_set_nonblock(*acquired_fd, TRUE);
msg_verbose("Acquired systemd syslog socket",
evt_tag_int("systemd-syslog-sock-fd", *acquired_fd));
return TRUE;
}
return TRUE;
}
#else
static gboolean
systemd_syslog_sd_acquire_socket(AFSocketSourceDriver *s,
gint *acquired_fd)
{
return TRUE;
}
#endif
static gboolean
systemd_syslog_sd_init_method(LogPipe *s)
{
SystemDSyslogSourceDriver *self = (SystemDSyslogSourceDriver *) s;
if (service_management_get_type() != SMT_SYSTEMD)
{
msg_error("Error initializing systemd-syslog() source",
evt_tag_str("systemd_status", "not-running"));
return FALSE;
}
if (self->from_unix_source)
{
msg_warning("systemd-syslog() source ignores configuration options. "
"Please, do not set anything on it");
socket_options_free(self->super.socket_options);
self->super.socket_options = socket_options_new();
socket_options_init_instance(self->super.socket_options);
}
return afsocket_sd_init_method((LogPipe *) &self->super);
}
SystemDSyslogSourceDriver *
systemd_syslog_sd_new(GlobalConfig *cfg, gboolean fallback)
{
SystemDSyslogSourceDriver *self;
TransportMapper *transport_mapper;
self = g_new0(SystemDSyslogSourceDriver, 1);
transport_mapper = transport_mapper_unix_dgram_new();
afsocket_sd_init_instance(&self->super, socket_options_new(), transport_mapper, cfg);
self->super.super.super.super.init = systemd_syslog_sd_init_method;
self->super.acquire_socket = systemd_syslog_sd_acquire_socket;
atomic_gssize_set(&self->super.max_connections, 256);
if (!self->super.bind_addr)
self->super.bind_addr = g_sockaddr_unix_new(NULL);
return self;
}
static gboolean
should_use_systemd_syslog_instead_of_unix_socket(gchar *filename)
{
return (service_management_get_type() == SMT_SYSTEMD &&
(strncmp("/dev/log", filename, 9) == 0 || strncmp("/run/systemd/journal/syslog", filename, 28) == 0))? TRUE : FALSE;
}
typedef enum _SocketType
{
ST_DGRAM,
ST_STREAM
} SocketType;
AFSocketSourceDriver *
create_afunix_sd(gchar *filename, GlobalConfig *cfg, SocketType socket_type)
{
AFUnixSourceDriver *ud = NULL;
if (socket_type == ST_DGRAM)
{
ud = afunix_sd_new_dgram(filename, cfg);
}
else if (socket_type == ST_STREAM)
{
ud = afunix_sd_new_stream(filename, cfg);
}
afunix_grammar_set_source_driver(ud);
return &ud->super;
}
static AFSocketSourceDriver *
create_and_set_unix_socket_or_systemd_syslog_source(gchar *filename, GlobalConfig *cfg, SocketType socket_type)
{
SystemDSyslogSourceDriver *sd;
if (should_use_systemd_syslog_instead_of_unix_socket(filename))
{
msg_warning("Using /dev/log Unix socket with systemd is not"
" possible. Changing to systemd-syslog source, which supports"
" socket activation.");
sd = systemd_syslog_sd_new(configuration, TRUE);
systemd_syslog_grammar_set_source_driver(sd);
return &sd->super;
}
else return create_afunix_sd(filename, cfg, socket_type);
}
AFSocketSourceDriver *
create_and_set_unix_dgram_or_systemd_syslog_source(gchar *filename, GlobalConfig *cfg)
{
return create_and_set_unix_socket_or_systemd_syslog_source(filename,
cfg,
ST_DGRAM);
}
AFSocketSourceDriver *
create_and_set_unix_stream_or_systemd_syslog_source(gchar *filename, GlobalConfig *cfg)
{
return create_and_set_unix_socket_or_systemd_syslog_source(filename,
cfg,
ST_STREAM);
}
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