[libnftables PATCH 1/2] Add function for exporting chain to JSON Format

[Alvaro Neira <alvaroneay@gmail.com>]

From: Alvaro Neira Ayuso <alvaroneay@gmail.com>


---
 include/libnftables/chain.h |    1 +
 src/chain.c                 |   27 +++++++++++++++++++++++++++
 src/internal.h              |    1 +
 3 files changed, 29 insertions(+)

diff --git a/include/libnftables/chain.h b/include/libnftables/chain.h
index f06f743..3645eaa 100644
--- a/include/libnftables/chain.h
+++ b/include/libnftables/chain.h
@@ -44,6 +44,7 @@ void nft_chain_nlmsg_build_payload(struct nlmsghdr *nlh, const struct nft_chain
 enum {
 	NFT_CHAIN_O_DEFAULT	= 0,
 	NFT_CHAIN_O_XML,
+	NFT_CHAIN_O_JSON,
 };
 
 enum nft_chain_parse_type {
diff --git a/src/chain.c b/src/chain.c
index 7775dfc..1c53daa 100644
--- a/src/chain.c
+++ b/src/chain.c
@@ -688,6 +688,31 @@ int nft_chain_parse(struct nft_chain *c, enum nft_chain_parse_type type,
 }
 EXPORT_SYMBOL(nft_chain_parse);
 
+static int nft_chain_snprintf_json(char *buf, size_t size, struct nft_chain *c)
+{
+	return snprintf(buf, size,
+		"{ \"chain\": {"
+			"\"name\": \"%s\","
+			"\"handle\": %lu,"
+			"\"bytes\": %lu,"
+			"\"packets\": %lu,"
+			"\"version\": %d,"
+			"\"properties\": {"
+				"\"type\" : \"%s\","
+				"\"table\" : \"%s\","
+				"\"prio\" : %d,"
+				"\"use\" : %d,"
+				"\"hooknum\" : %d,"
+				"\"policy\" : %d,"
+				"\"family\" : %d"
+			"}"
+		"}"
+		"}",
+			c->name, c->handle, c->bytes, c->packets,
+			NFT_CHAIN_JSON_VERSION, c->type, c->table,
+			c->prio, c->use, c->hooknum, c->policy, c->family);
+}
+
 static int nft_chain_snprintf_xml(char *buf, size_t size, struct nft_chain *c)
 {
 	return snprintf(buf, size,
@@ -721,6 +746,8 @@ int nft_chain_snprintf(char *buf, size_t size, struct nft_chain *c,
 		       uint32_t type, uint32_t flags)
 {
 	switch(type) {
+	case NFT_CHAIN_O_JSON:
+		return nft_chain_snprintf_json(buf, size, c);
 	case NFT_CHAIN_O_XML:
 		return nft_chain_snprintf_xml(buf, size, c);
 	case NFT_CHAIN_O_DEFAULT:
diff --git a/src/internal.h b/src/internal.h
index 0c5de21..769926b 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -21,6 +21,7 @@
 #define NFT_CHAIN_XML_VERSION 0
 #define NFT_RULE_XML_VERSION 0
 #define NFT_TABLE_JSON_VERSION 0
+#define NFT_CHAIN_JSON_VERSION 0
 
 struct expr_ops;