From 82168f934d5465dda7f0d165d384fc46bd86fab8 Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Sun, 14 Oct 2012 20:33:08 +0200
Subject: examples: add nft-events

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 examples/Makefile.am  |   4 ++
 examples/nft-events.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+)
 create mode 100644 examples/nft-events.c

(limited to 'examples')

diff --git a/examples/Makefile.am b/examples/Makefile.am
index 31e53bf..9b9e345 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -9,6 +9,7 @@ check_PROGRAMS = nft-table-add		\
 		 nft-rule-add		\
 		 nft-rule-del		\
 		 nft-rule-get		\
+		 nft-events		\
 		 nft-compat-get
 
 nft_table_add_SOURCES = nft-table-add.c
@@ -38,5 +39,8 @@ nft_rule_del_LDADD = ../src/libnftables.la ${LIBMNL_LIBS}
 nft_rule_get_SOURCES = nft-rule-get.c
 nft_rule_get_LDADD = ../src/libnftables.la ${LIBMNL_LIBS}
 
+nft_events_SOURCES = nft-events.c
+nft_events_LDADD = ../src/libnftables.la ${LIBMNL_LIBS}
+
 nft_compat_get_SOURCES = nft-compat-get.c
 nft_compat_get_LDADD = ../src/libnftables.la ${LIBMNL_LIBS}
diff --git a/examples/nft-events.c b/examples/nft-events.c
new file mode 100644
index 0000000..aa8c85e
--- /dev/null
+++ b/examples/nft-events.c
@@ -0,0 +1,154 @@
+/*
+ * (C) 2012 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 software has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftables/table.h>
+#include <libnftables/chain.h>
+#include <libnftables/rule.h>
+
+static int table_cb(const struct nlmsghdr *nlh, int type)
+{
+	struct nft_table *t;
+	char buf[4096];
+
+	t = nft_table_alloc();
+	if (t == NULL) {
+		perror("OOM");
+		goto err;
+	}
+
+	if (nft_table_nlmsg_parse(nlh, t) < 0) {
+		perror("nft_table_nlmsg_parse");
+		goto err_free;
+	}
+
+	nft_table_snprintf(buf, sizeof(buf), t, NFT_TABLE_O_DEFAULT, 0);
+	printf("[%s]\t%s", type == NFT_MSG_NEWTABLE ? "NEW" : "DEL", buf);
+
+err_free:
+	nft_table_free(t);
+err:
+	return MNL_CB_OK;
+}
+
+static int rule_cb(const struct nlmsghdr *nlh, int type)
+{
+	struct nft_rule *t;
+	char buf[4096];
+
+	t = nft_rule_alloc();
+	if (t == NULL) {
+		perror("OOM");
+		goto err;
+	}
+
+	if (nft_rule_nlmsg_parse(nlh, t) < 0) {
+		perror("nft_rule_nlmsg_parse");
+		goto err_free;
+	}
+
+	nft_rule_snprintf(buf, sizeof(buf), t, NFT_RULE_O_DEFAULT, 0);
+	printf("[%s]\t%s", type == NFT_MSG_NEWRULE ? "NEW" : "DEL", buf);
+
+err_free:
+	nft_rule_free(t);
+err:
+	return MNL_CB_OK;
+}
+
+static int chain_cb(const struct nlmsghdr *nlh, int type)
+{
+	struct nft_chain *t;
+	char buf[4096];
+
+	t = nft_chain_alloc();
+	if (t == NULL) {
+		perror("OOM");
+		goto err;
+	}
+
+	if (nft_chain_nlmsg_parse(nlh, t) < 0) {
+		perror("nft_chain_nlmsg_parse");
+		goto err_free;
+	}
+
+	nft_chain_snprintf(buf, sizeof(buf), t, NFT_CHAIN_O_DEFAULT, 0);
+	printf("[%s]\t%s", type == NFT_MSG_NEWCHAIN ? "NEW" : "DEL", buf);
+
+err_free:
+	nft_chain_free(t);
+err:
+	return MNL_CB_OK;
+}
+
+static int events_cb(const struct nlmsghdr *nlh, void *data)
+{
+	int ret = MNL_CB_OK;
+	int type = nlh->nlmsg_type & 0xFF;
+
+	switch(type) {
+	case NFT_MSG_NEWTABLE:
+	case NFT_MSG_DELTABLE:
+		ret = table_cb(nlh, type);
+		break;
+	case NFT_MSG_NEWCHAIN:
+	case NFT_MSG_DELCHAIN:
+		ret = chain_cb(nlh, type);
+		break;
+	case NFT_MSG_NEWRULE:
+	case NFT_MSG_DELRULE:
+		ret = rule_cb(nlh, type);
+		break;
+	}
+
+	return ret;
+}
+
+int main(int argc, char *argv[])
+{
+	struct mnl_socket *nl;
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	int ret;
+
+	nl = mnl_socket_open(NETLINK_NETFILTER);
+	if (nl == NULL) {
+		perror("mnl_socket_open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_bind(nl, (1 << (NFNLGRP_NFTABLES-1)), MNL_SOCKET_AUTOPID) < 0) {
+		perror("mnl_socket_bind");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	while (ret > 0) {
+		ret = mnl_cb_run(buf, ret, 0, 0, events_cb, NULL);
+		if (ret <= 0)
+			break;
+		ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	}
+	if (ret == -1) {
+		perror("error");
+		exit(EXIT_FAILURE);
+	}
+	mnl_socket_close(nl);
+
+	return EXIT_SUCCESS;
+}
-- 
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