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authorPablo Neira Ayuso <pablo@netfilter.org>2012-08-03 17:31:48 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2012-10-11 15:15:02 +0200
commit00c179b4c9f9f9394cc6f79e5f2a68410631fd72 (patch)
tree00057636d125f3c89e2b9485c67c4283a98d91b2 /examples/nft-chain-del.c
initial version of libnftables
It adds support for table, chain and rule handling. This also includes expression handling for each rule. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'examples/nft-chain-del.c')
-rw-r--r--examples/nft-chain-del.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/examples/nft-chain-del.c b/examples/nft-chain-del.c
new file mode 100644
index 0000000..ddbab3f
--- /dev/null
+++ b/examples/nft-chain-del.c
@@ -0,0 +1,93 @@
+/*
+ * (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.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftables/chain.h>
+
+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_chain *t = NULL;
+ int ret, family;
+
+ if (argc != 4) {
+ fprintf(stderr, "Usage: %s <family> <table> <chain>\n",
+ argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ if (strcmp(argv[1], "ip") == 0)
+ family = AF_INET;
+ else if (strcmp(argv[1], "ip6") == 0)
+ family = AF_INET6;
+ else if (strcmp(argv[1], "bridge") == 0)
+ family = AF_BRIDGE;
+ else {
+ fprintf(stderr, "Unknown family: ip, ip6, bridge\n");
+ exit(EXIT_FAILURE);
+ }
+
+ t = nft_chain_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+ seq = time(NULL);
+ nlh = nft_chain_nlmsg_build_hdr(buf, NFT_MSG_DELCHAIN, family,
+ NLM_F_ACK, seq);
+ nft_chain_attr_set(t, NFT_CHAIN_ATTR_TABLE, argv[2]);
+ nft_chain_attr_set(t, NFT_CHAIN_ATTR_NAME, argv[3]);
+ nft_chain_nlmsg_build_payload(nlh, t);
+ nft_chain_free(t);
+
+ 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, NULL, 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;
+}