It changes the parse and the snprint functions to omit unset values.
Signed-off-by: Ana Rey <anarey@xxxxxxxxx>
---
src/expr/exthdr.c | 57 +++++++++++++++++++++++++++++++++----------------------
1 file changed, 34 insertions(+), 23 deletions(-)
diff --git a/src/expr/exthdr.c b/src/expr/exthdr.c
index e624990..6fb83b2 100644
--- a/src/expr/exthdr.c
+++ b/src/expr/exthdr.c
@@ -243,32 +243,27 @@ nft_rule_expr_exthdr_xml_parse(struct nft_rule_expr *e, mxml_node_t *tree,
uint32_t dreg, len, offset;
if (nft_mxml_reg_parse(tree, "dreg", &dreg, MXML_DESCEND_FIRST,
- NFT_XML_MAND, err) != 0)
- return -1;
- nft_rule_expr_set_u32(e, NFT_EXPR_EXTHDR_DREG, dreg);
+ NFT_XML_MAND, err) == 0)
+ nft_rule_expr_set_u32(e, NFT_EXPR_EXTHDR_DREG, dreg);
exthdr_type = nft_mxml_str_parse(tree, "exthdr_type",
MXML_DESCEND_FIRST, NFT_XML_MAND, err);
- if (exthdr_type == NULL)
- return -1;
-
- type = str2exthdr_type(exthdr_type);
- if (type < 0)
- return -1;
- nft_rule_expr_set_u8(e, NFT_EXPR_EXTHDR_TYPE, type);
+ if (exthdr_type != NULL) {
+ type = str2exthdr_type(exthdr_type);
+ if (type < 0)
+ return -1;
+ nft_rule_expr_set_u8(e, NFT_EXPR_EXTHDR_TYPE, type);
+ }
/* Get and set <offset> */
if (nft_mxml_num_parse(tree, "offset", MXML_DESCEND_FIRST, BASE_DEC,
- &offset, NFT_TYPE_U32, NFT_XML_MAND, err) != 0)
- return -1;
- nft_rule_expr_set_u32(e, NFT_EXPR_EXTHDR_OFFSET, offset);
+ &offset, NFT_TYPE_U32, NFT_XML_MAND, err) == 0)
+ nft_rule_expr_set_u32(e, NFT_EXPR_EXTHDR_OFFSET, offset);
/* Get and set <len> */
if (nft_mxml_num_parse(tree, "len", MXML_DESCEND_FIRST, BASE_DEC,
- &len, NFT_TYPE_U32, NFT_XML_MAND, err) != 0)
- return -1;
-
- nft_rule_expr_set_u32(e, NFT_EXPR_EXTHDR_LEN, len);
+ &len, NFT_TYPE_U32, NFT_XML_MAND, err) == 0)
+ nft_rule_expr_set_u32(e, NFT_EXPR_EXTHDR_LEN, len);
return 0;
#else
@@ -293,13 +288,29 @@ static int nft_rule_expr_exthdr_snprintf_xml(char *buf, size_t len,
struct nft_rule_expr *e)
{
struct nft_expr_exthdr *exthdr = nft_expr_data(e);
+ int ret, size = len, offset = 0;
- return snprintf(buf, len, "<dreg>%u</dreg>"
- "<exthdr_type>%s</exthdr_type>"
- "<offset>%u</offset>"
- "<len>%u</len>",
- exthdr->dreg, exthdr_type2str(exthdr->type),
- exthdr->offset, exthdr->len);
+ if (e->flags & (1 << NFT_EXPR_EXTHDR_DREG)) {
+ ret = snprintf(buf, len, "<dreg>%u</dreg>", exthdr->dreg);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+ if (e->flags & (1 << NFT_EXPR_EXTHDR_TYPE)) {
+ ret = snprintf(buf + offset, len,
+ "<exthdr_type>%s</exthdr_type>",
+ exthdr_type2str(exthdr->type));
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+ if (e->flags & (1 << NFT_EXPR_EXTHDR_OFFSET)) {
+ ret = snprintf(buf + offset, len, "<offset>%u</offset>",
+ exthdr->offset);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+ if (e->flags & (1 << NFT_EXPR_EXTHDR_LEN)) {
+ ret = snprintf(buf + offset, len, "<len>%u</len>", exthdr->len);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+
+ return offset;
}
static int nft_rule_expr_exthdr_snprintf_default(char *buf, size_t len,
--
2.0.0
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