[libnftables PATCH 1/2] Add functions for exporting tables to JSON format

[Alvaro Neira <alvaroneay@gmail.com>]

---
 include/libnftables/table.h |    1 +
 src/internal.h              |    1 +
 src/table.c                 |   18 ++++++++++++++++++
 3 files changed, 20 insertions(+)

diff --git a/include/libnftables/table.h b/include/libnftables/table.h
index 658230c..19f322c 100644
--- a/include/libnftables/table.h
+++ b/include/libnftables/table.h
@@ -31,6 +31,7 @@ void nft_table_nlmsg_build_payload(struct nlmsghdr *nlh, const struct nft_table
 enum {
 	NFT_TABLE_O_DEFAULT	= 0,
 	NFT_TABLE_O_XML,
+	NFT_TABLE_O_JSON,
 };
 
 enum nft_table_parse_type {
diff --git a/src/internal.h b/src/internal.h
index 3ad5e89..0c5de21 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -20,6 +20,7 @@
 #define NFT_TABLE_XML_VERSION 0
 #define NFT_CHAIN_XML_VERSION 0
 #define NFT_RULE_XML_VERSION 0
+#define NFT_TABLE_JSON_VERSION 0
 
 struct expr_ops;
 
diff --git a/src/table.c b/src/table.c
index a868da4..de106bb 100644
--- a/src/table.c
+++ b/src/table.c
@@ -300,6 +300,22 @@ int nft_table_parse(struct nft_table *t, enum nft_table_parse_type type,
 }
 EXPORT_SYMBOL(nft_table_parse);
 
+static int nft_table_snprintf_json(char *buf, size_t size, struct nft_table *t)
+{
+	return snprintf(buf, size,
+			"{\"table\" : {"
+			"\"name\" : \"%s\","
+			"\"version\" : %d,"
+			"\"properties\" : {"
+				"\"family\" : %u,"
+				"\"table_flags\" : %d"
+				"}"
+			"}"
+			"}" ,
+			t->name, NFT_TABLE_JSON_VERSION,
+			t->family, t->table_flags);
+}
+
 static int nft_table_snprintf_xml(char *buf, size_t size, struct nft_table *t)
 {
 	return snprintf(buf, size,
@@ -325,6 +341,8 @@ int nft_table_snprintf(char *buf, size_t size, struct nft_table *t,
 	switch(type) {
 	case NFT_TABLE_O_XML:
 		return nft_table_snprintf_xml(buf, size, t);
+	case NFT_TABLE_O_JSON:
+		return nft_table_snprintf_json(buf, size, t);
 	case NFT_TABLE_O_DEFAULT:
 		return nft_table_snprintf_default(buf, size, t);
 	default: