Add example (based on nft-get-rule.c) to demonstrate selective rule
dumping when table and / or chain attributes are set in a rule dump request.
Used to test the changes made in "[PATCH nf-next] netfilter: nf_tables:
allow to filter out rules by table and chain"
(http://marc.info/?t=146237901200004&r=1&w=2).
Signed-off-by: Josue Alvarez <jalvarez@xxxxxxxxxxxxxxxxxxxx>
--
diff --git a/examples/Makefile.am b/examples/Makefile.am
index e002d36..73450c2 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -13,6 +13,7 @@ check_PROGRAMS = nft-table-add \
nft-rule-parse-add \
nft-rule-del \
nft-rule-get \
+ nft-rule-selective-get \
nft-events \
nft-set-add \
nft-set-parse-add \
@@ -40,6 +41,9 @@ nft_table_del_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
nft_table_get_SOURCES = nft-table-get.c
nft_table_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+nft_rule_selective_get_SOURCES = nft-rule-selective-get.c
+nft_rule_selective_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
nft_chain_add_SOURCES = nft-chain-add.c
nft_chain_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
diff --git a/examples/nft-rule-selective-get.c
b/examples/nft-rule-selective-get.c
new file mode 100644
index 0000000..a1b82c1
--- /dev/null
+++ b/examples/nft-rule-selective-get.c
@@ -0,0 +1,164 @@
+/*
+ * (C) 2012 by Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
+ *
+ * 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 <libnftnl/rule.h>
+
+static int table_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nftnl_rule *t;
+ char buf[4096];
+ uint32_t *type = data;
+
+ t = nftnl_rule_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ goto err;
+ }
+
+ if (nftnl_rule_nlmsg_parse(nlh, t) < 0) {
+ perror("nftnl_rule_nlmsg_parse");
+ goto err_free;
+ }
+
+ nftnl_rule_snprintf(buf, sizeof(buf), t, *type, 0);
+ printf("%s\n", buf);
+
+err_free:
+ nftnl_rule_free(t);
+err:
+ return MNL_CB_OK;
+}
+
+static struct nftnl_rule *setup_rule(uint8_t family, const char *table,
+ const char *chain, const char *handle)
+{
+ struct nftnl_rule *r = NULL;
+ uint8_t proto;
+ uint16_t dport;
+ uint64_t handle_num;
+
+ r = nftnl_rule_alloc();
+ if (r == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+
+ if (table != NULL)
+ nftnl_rule_set(r, NFTNL_RULE_TABLE, table);
+
+ if (chain != NULL)
+ nftnl_rule_set(r, NFTNL_RULE_CHAIN, chain);
+
+ nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, family);
+
+ if (handle != NULL) {
+ handle_num = atoll(handle);
+ nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, handle_num);
+ }
+
+ return r;
+}
+
+int main(int argc, char *argv[])
+{
+ struct mnl_socket *nl;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ const char *table, *chain = NULL;
+ struct nlmsghdr *nlh;
+ uint32_t portid, seq, type = NFTNL_OUTPUT_DEFAULT;
+ struct nftnl_rule *t, *r = NULL;
+ int ret, family;
+
+ if (argc < 2 || argc > 4) {
+ fprintf(stderr, "Usage: %s <family> [<table>] [<chain>]\n",
+ argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ if (strcmp(argv[1], "ip") == 0)
+ family = NFPROTO_IPV4;
+ else if (strcmp(argv[1], "ip6") == 0)
+ family = NFPROTO_IPV6;
+ else if (strcmp(argv[1], "bridge") == 0)
+ family = NFPROTO_BRIDGE;
+ else if (strcmp(argv[1], "arp") == 0)
+ family = NFPROTO_ARP;
+ else if (strcmp(argv[1], "unspec") == 0)
+ family = NFPROTO_UNSPEC;
+ else {
+ fprintf(stderr, "Unknown family: ip, ip6, bridge, arp, unspec\n");
+ exit(EXIT_FAILURE);
+ }
+
+ if (argc > 2)
+ table = argv[2];
+
+ if (argc > 3)
+ chain = argv[3];
+
+ /* XXX requires table, chain and handle attributes for selective get */
+
+ t = nftnl_rule_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+
+ r = setup_rule(family, table, chain, NULL);
+
+ seq = time(NULL);
+ nlh = nftnl_rule_nlmsg_build_hdr(buf, NFT_MSG_GETRULE, family,
+ NLM_F_DUMP, seq);
+
+ nftnl_rule_nlmsg_build_payload(nlh, r);
+
+
+ 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, &type);
+ 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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