From caf2a6ad2d2229da9881733c6a5f061dbce9b45b Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Mon, 14 Feb 2022 12:31:48 +0100 Subject: examples: add libnftables example program Create an example folder to add example source code files to show how to use libnftables. Add first example program using the buffer API. Signed-off-by: Pablo Neira Ayuso --- examples/nft-buffer.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 examples/nft-buffer.c (limited to 'examples/nft-buffer.c') diff --git a/examples/nft-buffer.c b/examples/nft-buffer.c new file mode 100644 index 00000000..1c4b1e04 --- /dev/null +++ b/examples/nft-buffer.c @@ -0,0 +1,34 @@ +/* gcc nft-buffer.c -o nft-buffer -lnftables */ +#include +#include + +const char ruleset[] = + "flush ruleset;" + "add table x;" + "add chain x y { type filter hook input priority 0; };" + "add rule x y counter;"; + +int main(void) +{ + struct nft_ctx *ctx; + int err; + + ctx = nft_ctx_new(0); + if (!ctx) { + perror("cannot allocate nft context"); + return EXIT_FAILURE; + } + + /* create ruleset: all commands in the buffer are atomically applied */ + err = nft_run_cmd_from_buffer(ctx, ruleset); + if (err < 0) + fprintf(stderr, "failed to run nftables command\n"); + + err = nft_run_cmd_from_buffer(ctx, "list ruleset"); + if (err < 0) + fprintf(stderr, "failed to run nftables command\n"); + + nft_ctx_free(ctx); + + return EXIT_SUCCESS; +} -- cgit v1.2.3