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-rw-r--r--examples/Makefile.am4
-rw-r--r--examples/nft-events.c154
2 files changed, 158 insertions, 0 deletions
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;
+}