debian conntrack 0.9.14-2

1 files changed, 261 insertions, 0 deletions

diff --git a/src/cache_iterators.c b/src/cache_iterators.c
new file mode 100644
index 0000000..c7183fd
--- /dev/null
+++ b/src/cache_iterators.c
@@ -0,0 +1,261 @@
+/*
+ * (C) 2006-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
+ * 
+ * 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 2 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "cache.h"
+#include "hash.h"
+#include "log.h"
+#include "conntrackd.h"
+#include "netlink.h"
+#include "event.h"
+
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <sched.h>
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+
+struct __dump_container {
+	int fd;
+	int type;
+};
+
+static int do_dump(void *data1, void *n)
+{
+	char buf[1024];
+	int size;
+	struct __dump_container *container = data1;
+	struct cache_object *obj = n;
+	char *data = obj->data;
+	unsigned i;
+
+	/*
+	 * XXX: Do not dump the entries that are scheduled to expire.
+	 * 	These entries talk about already destroyed connections
+	 * 	that we keep for some time just in case that we have to
+	 * 	resent some lost messages. We do not show them to the
+	 * 	user as he may think that the firewall replicas are not
+	 * 	in sync. The branch below is a hack as it is quite
+	 * 	specific and it breaks conntrackd modularity. Probably
+	 * 	there's a nicer way to do this but until I come up with it...
+	 */
+	if (CONFIG(flags) & CTD_SYNC_FTFW && obj->status == C_OBJ_DEAD)
+		return 0;
+
+	/* do not show cached timeout, this may confuse users */
+	if (nfct_attr_is_set(obj->ct, ATTR_TIMEOUT))
+		nfct_attr_unset(obj->ct, ATTR_TIMEOUT);
+
+	memset(buf, 0, sizeof(buf));
+	size = nfct_snprintf(buf, 
+			     sizeof(buf), 
+			     obj->ct, 
+			     NFCT_T_UNKNOWN, 
+			     container->type,
+			     0);
+
+	for (i = 0; i < obj->cache->num_features; i++) {
+		if (obj->cache->features[i]->dump) {
+			size += obj->cache->features[i]->dump(obj, 
+							      data, 
+							      buf+size,
+							      container->type);
+			data += obj->cache->features[i]->size;
+		}
+	}
+	if (container->type != NFCT_O_XML) {
+		long tm = time(NULL);
+		size += sprintf(buf+size, " [active since %lds]",
+				tm - obj->lifetime);
+	}
+	size += sprintf(buf+size, "\n");
+	if (send(container->fd, buf, size, 0) == -1) {
+		if (errno != EPIPE)
+			return -1;
+	}
+
+	return 0;
+}
+
+void cache_dump(struct cache *c, int fd, int type)
+{
+	struct __dump_container tmp = {
+		.fd	= fd,
+		.type	= type
+	};
+
+	hashtable_iterate(c->h, (void *) &tmp, do_dump);
+}
+
+struct __commit_container {
+	struct nfct_handle 	*h;
+	struct cache 		*c;
+};
+
+static void
+__do_commit_step(struct __commit_container *tmp, struct cache_object *obj)
+{
+	int ret, retry = 1, timeout;
+	struct nf_conntrack *ct = obj->ct;
+
+	if (CONFIG(commit_timeout)) {
+		timeout = CONFIG(commit_timeout);
+	} else {
+		timeout = time(NULL) - obj->lastupdate;
+		if (timeout < 0) {
+			/* XXX: Arbitrarily set the timer to one minute, how
+			 * can this happen? For example, an adjustment due to
+			 * daylight-saving. Probably other situations can
+			 * trigger this. */
+			timeout = 60;
+		}
+		/* calculate an estimation of the current timeout */
+		timeout = nfct_get_attr_u32(ct, ATTR_TIMEOUT) - timeout;
+		if (timeout < 0) {
+			timeout = 60;
+		}
+	}
+
+retry:
+	if (nl_create_conntrack(tmp->h, ct, timeout) == -1) {
+		if (errno == EEXIST && retry == 1) {
+			ret = nl_destroy_conntrack(tmp->h, ct);
+			if (ret == 0 || (ret == -1 && errno == ENOENT)) {
+				if (retry) {
+					retry = 0;
+					goto retry;
+				}
+			}
+			dlog(LOG_ERR, "commit-destroy: %s", strerror(errno));
+			dlog_ct(STATE(log), ct, NFCT_O_PLAIN);
+			tmp->c->stats.commit_fail++;
+		} else {
+			dlog(LOG_ERR, "commit-create: %s", strerror(errno));
+			dlog_ct(STATE(log), ct, NFCT_O_PLAIN);
+			tmp->c->stats.commit_fail++;
+		}
+	} else {
+		tmp->c->stats.commit_ok++;
+	}
+}
+
+static int do_commit_related(void *data, void *n)
+{
+	struct cache_object *obj = n;
+
+	if (ct_is_related(obj->ct))
+		__do_commit_step(data, obj);
+
+	/* keep iterating even if we have found errors */
+	return 0;
+}
+
+static int do_commit_master(void *data, void *n)
+{
+	struct cache_object *obj = n;
+
+	if (ct_is_related(obj->ct))
+		return 0;
+
+	__do_commit_step(data, obj);
+	return 0;
+}
+
+void cache_commit(struct cache *c, struct nfct_handle *h, int clientfd)
+{
+	unsigned int commit_ok, commit_fail;
+	struct __commit_container tmp = {
+		.h = h,
+		.c = c,
+	};
+	struct timeval commit_stop, res;
+
+	switch(STATE_SYNC(commit).state) {
+	case COMMIT_STATE_INACTIVE:
+		gettimeofday(&STATE_SYNC(commit).stats.start, NULL);
+		STATE_SYNC(commit).stats.ok = c->stats.commit_ok;
+		STATE_SYNC(commit).stats.fail = c->stats.commit_fail;
+		STATE_SYNC(commit).clientfd = clientfd;
+	case COMMIT_STATE_MASTER:
+		STATE_SYNC(commit).current =
+			hashtable_iterate_limit(c->h, &tmp,
+						STATE_SYNC(commit).current,
+						CONFIG(general).commit_steps,
+						do_commit_master);
+		if (STATE_SYNC(commit).current < CONFIG(hashsize)) {
+			STATE_SYNC(commit).state = COMMIT_STATE_MASTER;
+			/* give it another step as soon as possible */
+			write_evfd(STATE_SYNC(commit).evfd);
+			return;
+		}
+		STATE_SYNC(commit).current = 0;
+		STATE_SYNC(commit).state = COMMIT_STATE_RELATED;
+	case COMMIT_STATE_RELATED:
+		STATE_SYNC(commit).current =
+			hashtable_iterate_limit(c->h, &tmp,
+						STATE_SYNC(commit).current,
+						CONFIG(general).commit_steps,
+						do_commit_related);
+		if (STATE_SYNC(commit).current < CONFIG(hashsize)) {
+			STATE_SYNC(commit).state = COMMIT_STATE_RELATED;
+			/* give it another step as soon as possible */
+			write_evfd(STATE_SYNC(commit).evfd);
+			return;
+		}
+		/* calculate the time that commit has taken */
+		gettimeofday(&commit_stop, NULL);
+		timersub(&commit_stop, &STATE_SYNC(commit).stats.start, &res);
+
+		/* calculate new entries committed */
+		commit_ok = c->stats.commit_ok - STATE_SYNC(commit).stats.ok;
+		commit_fail = 
+			c->stats.commit_fail - STATE_SYNC(commit).stats.fail;
+
+		/* log results */
+		dlog(LOG_NOTICE, "Committed %u new entries", commit_ok);
+
+		if (commit_fail)
+			dlog(LOG_NOTICE, "%u entries can't be "
+					 "committed", commit_fail);
+
+		dlog(LOG_NOTICE, "commit has taken %lu.%06lu seconds", 
+				res.tv_sec, res.tv_usec);
+
+		/* prepare the state machine for new commits */
+		STATE_SYNC(commit).current = 0;
+		STATE_SYNC(commit).state = COMMIT_STATE_INACTIVE;
+
+		/* Close the client socket now that we're done. */
+		close(STATE_SYNC(commit).clientfd);
+	}
+}
+
+static int do_flush(void *data, void *n)
+{
+	struct cache *c = data;
+	struct cache_object *obj = n;
+
+	cache_del(c, obj);
+	cache_object_free(obj);
+	return 0;
+}
+
+void cache_flush(struct cache *c)
+{
+	hashtable_iterate(c->h, c, do_flush);
+	c->stats.flush++;
+}