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-rw-r--r--examples/nft-rule-get.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/examples/nft-rule-get.c b/examples/nft-rule-get.c
new file mode 100644
index 0000000..75043d7
--- /dev/null
+++ b/examples/nft-rule-get.c
@@ -0,0 +1,99 @@
+/*
+ * (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/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftables/rule.h>
+
+static int table_cb(const struct nlmsghdr *nlh, void *data)
+{
+ 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", buf);
+
+err_free:
+ nft_rule_free(t);
+err:
+ return MNL_CB_OK;
+}
+
+int main(int argc, char *argv[])
+{
+ struct mnl_socket *nl;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct nlmsghdr *nlh;
+ uint32_t portid, seq;
+ struct nft_rule *t = NULL;
+ int ret;
+
+ /* XXX requires table, chain and handle attributes for selective get */
+
+ t = nft_rule_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+
+ seq = time(NULL);
+ nlh = nft_rule_nlmsg_build_hdr(buf, NFT_MSG_GETRULE, AF_INET,
+ NLM_F_DUMP, seq);
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+ portid = mnl_socket_get_portid(nl);
+
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+ perror("mnl_socket_send");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ ret = mnl_cb_run(buf, ret, seq, portid, table_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;
+}