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/*
* Copyright (c) 2002-2012 Balabit
* Copyright (c) 1998-2012 Balázs Scheidler
*
* 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, 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 "logmpx.h"
#include "cfg-walker.h"
void
log_multiplexer_add_next_hop(LogMultiplexer *self, LogPipe *next_hop)
{
g_ptr_array_add(self->next_hops, next_hop);
}
static gboolean
log_multiplexer_init(LogPipe *s)
{
LogMultiplexer *self = (LogMultiplexer *) s;
gint i;
for (i = 0; i < self->next_hops->len; i++)
{
LogPipe *branch_head = g_ptr_array_index(self->next_hops, i);
LogPipe *p;
for (p = branch_head; p; p = p->pipe_next)
{
branch_head->flags |= (p->flags & PIF_BRANCH_PROPERTIES);
}
if (branch_head->flags & PIF_BRANCH_FALLBACK)
{
self->fallback_exists = TRUE;
}
}
return TRUE;
}
static gboolean
log_multiplexer_deinit(LogPipe *self)
{
return TRUE;
}
static void
log_multiplexer_queue(LogPipe *s, LogMessage *msg, const LogPathOptions *path_options)
{
LogMultiplexer *self = (LogMultiplexer *) s;
gint i;
LogPathOptions local_options = *path_options;
gboolean matched;
gboolean delivered = FALSE;
gint fallback;
local_options.matched = &matched;
if (self->next_hops->len > 1)
{
log_msg_write_protect(msg);
}
for (fallback = 0; (fallback == 0) || (fallback == 1 && self->fallback_exists && !delivered); fallback++)
{
for (i = 0; i < self->next_hops->len; i++)
{
LogPipe *next_hop = g_ptr_array_index(self->next_hops, i);
if (G_UNLIKELY(fallback == 0 && (next_hop->flags & PIF_BRANCH_FALLBACK) != 0))
{
continue;
}
else if (G_UNLIKELY(fallback && (next_hop->flags & PIF_BRANCH_FALLBACK) == 0))
{
continue;
}
matched = TRUE;
log_msg_add_ack(msg, &local_options);
log_pipe_queue(next_hop, log_msg_ref(msg), &local_options);
if (matched)
{
delivered = TRUE;
if (G_UNLIKELY(next_hop->flags & PIF_BRANCH_FINAL))
break;
}
}
}
if (self->next_hops->len > 1)
{
log_msg_write_unprotect(msg);
}
/* NOTE: non of our multiplexed destinations delivered this message, let's
* propagate this result. But only if we don't have a "next". If we do,
* that would be responsible for doing the same, for instance if it is a
* filter.
*
* In case where this matters most (e.g. the multiplexer attached to the
* source LogPipe), "next" will always be NULL. I am not sure if there's
* ever a case, where a LogMpx has both "next" set, and have branches as
* well.
*
* If there's such a case, then from a conceptual point of view, this Mpx
* instance should transfer the responsibility for setting "matched" to
* the next pipeline element, which is what we do here.
*/
if (!s->pipe_next && !delivered && path_options->matched)
*path_options->matched = FALSE;
log_pipe_forward_msg(s, msg, path_options);
}
static void
log_multiplexer_free(LogPipe *s)
{
LogMultiplexer *self = (LogMultiplexer *) s;
g_ptr_array_free(self->next_hops, TRUE);
log_pipe_free_method(s);
}
static void
_append(LogPipe *to, gpointer *user_data)
{
LogPipe *from = user_data[0];
GList **list = user_data[1];
Arc *arc = arc_new(from, to, ARC_TYPE_NEXT_HOP);
*list = g_list_append(*list, arc);
}
static GList *
_arcs(LogPipe *s)
{
LogMultiplexer *self = (LogMultiplexer *)s;
GList *list = NULL;
g_ptr_array_foreach(self->next_hops, (GFunc)_append, (gpointer[2])
{
self, &list
});
if (s->pipe_next)
list = g_list_append(list, arc_new((LogPipe *)self, s->pipe_next, ARC_TYPE_PIPE_NEXT));
return list;
};
LogMultiplexer *
log_multiplexer_new(GlobalConfig *cfg)
{
LogMultiplexer *self = g_new0(LogMultiplexer, 1);
log_pipe_init_instance(&self->super, cfg);
self->super.init = log_multiplexer_init;
self->super.deinit = log_multiplexer_deinit;
self->super.queue = log_multiplexer_queue;
self->super.free_fn = log_multiplexer_free;
self->next_hops = g_ptr_array_new();
self->super.arcs = _arcs;
log_pipe_add_info(&self->super, "multiplexer");
return self;
}
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