src: new error reporting approach for XML/JSON parsers

I have added a new structure for reporting some errors in parser
that we can't cover with errno.

In this patch, we have three errors that we can't cover with errno:

NFT_PARSE_EBADINPUT : Bad XML/JSON format in the input
NFT_PARSE_EMISSINGNODE : Missing node in our input
NFT_PARSE_EBADTYPE : Wrong type value in a node

Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/examples/nft-chain-xml-add.c b/examples/nft-chain-xml-add.c
index 03a2950..79b1541 100644
--- a/examples/nft-chain-xml-add.c
+++ b/examples/nft-chain-xml-add.c
@@ -37,6 +37,7 @@ int main(int argc, char *argv[])
 	uint16_t family;
 	char xml[4096];
 	char reprint[4096];
+	struct nft_parse_err *err;
 
 	if (argc < 2) {
 		printf("Usage: %s <xml-file>\n", argv[0]);
@@ -49,6 +50,12 @@ int main(int argc, char *argv[])
 		exit(EXIT_FAILURE);
 	}
 
+	err = nft_parse_err_alloc();
+	if (err == NULL) {
+		perror("error");
+		exit(EXIT_FAILURE);
+	}
+
         fd = open(argv[1], O_RDONLY);
         if (fd < 0) {
                 perror("open");
@@ -63,8 +70,8 @@ int main(int argc, char *argv[])
 
 	close(fd);
 
-	if (nft_chain_parse(c, NFT_PARSE_XML, xml) < 0) {
-		printf("E: Unable to parse XML file: %s\n", strerror(errno));
+	if (nft_chain_parse(c, NFT_PARSE_XML, xml, err) < 0) {
+		nft_parse_perror("Unable to parse XML file", err);
 		exit(EXIT_FAILURE);
 	}
 
@@ -80,6 +87,7 @@ int main(int argc, char *argv[])
 	nft_chain_nlmsg_build_payload(nlh, c);
 
 	nft_chain_free(c);
+	nft_parse_err_free(err);
 
 	nl = mnl_socket_open(NETLINK_NETFILTER);
 	if (nl == NULL) {