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authorStéphane Veyret <sveyret@gmail.com>2019-05-31 18:51:45 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2019-06-19 13:11:34 +0200
commit7992160689ed70e1572cd63345cf0a123c462968 (patch)
tree4c1645328775dfd06862aef4c75a479da2daad71 /examples/nft-ct-expectation-get.c
parentc4b6aa09b85d2604a07ad4b4464b1cbf6e7fa238 (diff)
examples: add ct expectation examples
Add examples for ct expectations. Add, list and delete ct expectation objects from specified table. Add expectation object to rule. Signed-off-by: Stéphane Veyret <sveyret@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'examples/nft-ct-expectation-get.c')
-rw-r--r--examples/nft-ct-expectation-get.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/examples/nft-ct-expectation-get.c b/examples/nft-ct-expectation-get.c
new file mode 100644
index 0000000..12c1350
--- /dev/null
+++ b/examples/nft-ct-expectation-get.c
@@ -0,0 +1,142 @@
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * 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.
+ */
+
+#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/object.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+ if (strcmp(str, "ip") == 0)
+ return NFPROTO_IPV4;
+ else if (strcmp(str, "ip6") == 0)
+ return NFPROTO_IPV6;
+ else if (strcmp(str, "inet") == 0)
+ return NFPROTO_INET;
+ else if (strcmp(str, "arp") == 0)
+ return NFPROTO_INET;
+ fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+ exit(EXIT_FAILURE);
+}
+
+static struct nftnl_obj *obj_parse(int argc, char *argv[])
+{
+ struct nftnl_obj *t;
+ uint16_t family;
+
+ t = nftnl_obj_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ return NULL;
+ }
+
+ family = parse_family(argv[1], "family");
+ nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
+ nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
+ nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
+
+ if (argc > 3)
+ nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
+
+ return t;
+}
+
+static int obj_cb(const struct nlmsghdr *nlh, void *data)
+{
+ uint32_t *type = data;
+ struct nftnl_obj *t;
+ char buf[4096];
+
+ t = nftnl_obj_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ goto err;
+ }
+
+ if (nftnl_obj_nlmsg_parse(nlh, t) < 0) {
+ perror("nftnl_obj_nlmsg_parse");
+ goto err_free;
+ }
+
+ nftnl_obj_snprintf(buf, sizeof(buf), t, *type, 0);
+ printf("%s\n", buf);
+
+err_free:
+ nftnl_obj_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, family;
+ struct nftnl_obj *t;
+ int ret;
+ uint32_t type = NFTNL_OUTPUT_DEFAULT;
+ uint16_t flags = NLM_F_ACK;
+
+ if (argc < 3 || argc > 4) {
+ fprintf(stderr, "%s <family> <table> [<name>]\n", argv[0]);
+ return EXIT_FAILURE;
+ }
+
+ t = obj_parse(argc, argv);
+ if (t == NULL)
+ exit(EXIT_FAILURE);
+ family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
+
+ seq = time(NULL);
+ if (argc < 4)
+ flags = NLM_F_DUMP;
+ nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETOBJ, family, flags, seq);
+ nftnl_obj_nlmsg_build_payload(nlh, t);
+ nftnl_obj_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, obj_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;
+}