examples: nft-set-json-add: generalize parsing format support

Let's create a single code example with XML/JSON support.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>

1 files changed, 147 insertions, 0 deletions

diff --git a/examples/nft-set-parse-add.c b/examples/nft-set-parse-add.c
new file mode 100644
index 0000000..b74ad7f
--- /dev/null
+++ b/examples/nft-set-parse-add.c
@@ -0,0 +1,147 @@
+/*
+ * (C) 2013 by Álvaro Neira Ayuso <alvaroneay@gmail.com>
+ *
+ * Based on nft-set-xml-add from:
+ *
+ * (C) 2013 by Pablo Neira Ayuso <pablo@netfilter.org>
+ * (C) 2013 by Arturo Borrero Gonzalez <arturo.borrero.glez@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 <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/set.h>
+
+static struct nft_set *set_parse_file(const char *file, uint16_t format)
+{
+	int fd;
+	struct nft_set *s;
+	struct nft_parse_err *err;
+	char data[4096];
+
+	s = nft_set_alloc();
+	if (s == NULL) {
+		perror("OOM");
+		return NULL;
+	}
+
+	fd = open(file, O_RDONLY);
+	if (fd < 0) {
+		perror("open");
+		return NULL;
+	}
+
+	if (read(fd, data, sizeof(data)) < 0) {
+		perror("read");
+		close(fd);
+		return NULL;
+	}
+	close(fd);
+
+	err = nft_parse_err_alloc();
+	if (err == NULL) {
+		perror("error");
+		return NULL;
+	}
+
+	if (nft_set_parse(s, format, data, err) < 0) {
+		nft_parse_perror("Unable to parse file", err);
+		nft_parse_err_free(err);
+		return NULL;
+	}
+
+	nft_parse_err_free(err);
+	return s;
+
+}
+
+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_set *s;
+	int ret;
+	uint16_t family, format, outformat;
+
+	if (argc < 2) {
+		printf("Usage: %s {xml|json} <file>\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	if (strcmp(argv[1], "xml") == 0) {
+		format = NFT_PARSE_XML;
+		outformat = NFT_OUTPUT_XML;
+	} else if (strcmp(argv[1], "json") == 0) {
+		format = NFT_PARSE_JSON;
+		outformat = NFT_OUTPUT_JSON;
+	} else {
+		printf("Unknown format: xml, json\n");
+		exit(EXIT_FAILURE);
+	}
+
+	s = set_parse_file(argv[2], format);
+	if (s == NULL)
+		exit(EXIT_FAILURE);
+
+	nft_set_fprintf(stdout, s, outformat, 0);
+	fprintf(stdout, "\n");
+
+	family = nft_set_attr_get_u32(s, NFT_SET_ATTR_FAMILY);
+
+	seq = time(NULL);
+
+	nlh = nft_set_nlmsg_build_hdr(buf, NFT_MSG_NEWSET, family,
+					NLM_F_CREATE|NLM_F_ACK, seq);
+	nft_set_nlmsg_build_payload(nlh, s);
+	nft_set_free(s);
+
+	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;
+}