[PATCH nft 2/3] scanner: correctly compute include depth

[Laurent Fasnacht <fasnacht@protonmail.ch>]

Inclusion depth was computed incorrectly for glob includes.

Signed-off-by: Laurent Fasnacht <fasnacht@protonmail.ch>
---
 include/nftables.h |  2 ++
 src/scanner.l      | 20 ++++++++++++++------
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/include/nftables.h b/include/nftables.h
index ca0fbcaf..1d423738 100644
--- a/include/nftables.h
+++ b/include/nftables.h
@@ -176,6 +176,7 @@ enum input_descriptor_types {
  *
  * @location:		location, used for include statements
  * @f:          file descriptor
+ * @depth:      include depth of the descriptor
  * @type:		input descriptor type
  * @name:		name describing the input
  * @union:		buffer or file descriptor, depending on type
@@ -187,6 +188,7 @@ enum input_descriptor_types {
 struct input_descriptor {
 	struct list_head		list;
 	FILE*                   f;
+	unsigned int            depth;
 	struct location			location;
 	enum input_descriptor_types	type;
 	const char			*name;
diff --git a/src/scanner.l b/src/scanner.l
index 2016acd5..837bc476 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -691,7 +691,8 @@ static void scanner_pop_buffer(yyscan_t scanner)
 }
 
 static void scanner_push_file(struct nft_ctx *nft, void *scanner,
-				  FILE *f, const char *filename, const struct location *loc)
+				  FILE *f, const char *filename, const struct location *loc,
+				  const struct input_descriptor *parent_indesc)
 {
 	struct parser_state *state = yyget_extra(scanner);
 	struct input_descriptor *indesc;
@@ -706,6 +707,11 @@ static void scanner_push_file(struct nft_ctx *nft, void *scanner,
 		indesc->location = *loc;
 	indesc->type	= INDESC_FILE;
 	indesc->name	= xstrdup(filename);
+	if (!parent_indesc) {
+		indesc->depth = 1;
+	} else {
+		indesc->depth = parent_indesc->depth + 1;
+	}
 	indesc->f = f;
 	init_pos(indesc);
 
@@ -714,13 +720,14 @@ static void scanner_push_file(struct nft_ctx *nft, void *scanner,
 }
 
 static int include_file(struct nft_ctx *nft, void *scanner,
-			const char *filename, const struct location *loc)
+			const char *filename, const struct location *loc,
+			const struct input_descriptor *parent_indesc)
 {
 	struct parser_state *state = yyget_extra(scanner);
 	struct error_record *erec;
 	FILE *f;
 
-	if (state->indesc_idx == MAX_INCLUDE_DEPTH) {
+	if (parent_indesc && parent_indesc->depth == MAX_INCLUDE_DEPTH) {
 		erec = error(loc, "Include nested too deeply, max %u levels",
 			     MAX_INCLUDE_DEPTH);
 		goto err;
@@ -732,7 +739,7 @@ static int include_file(struct nft_ctx *nft, void *scanner,
 			     filename, strerror(errno));
 		goto err;
 	}
-	scanner_push_file(nft, scanner, f, filename, loc);
+	scanner_push_file(nft, scanner, f, filename, loc, parent_indesc);
 	return 0;
 err:
 	erec_queue(erec, state->msgs);
@@ -743,6 +750,7 @@ static int include_glob(struct nft_ctx *nft, void *scanner, const char *pattern,
 			const struct location *loc)
 {
 	struct parser_state *state = yyget_extra(scanner);
+	struct input_descriptor *indesc = state->indesc;
 	struct error_record *erec = NULL;
 	bool wildcard = false;
 	glob_t glob_data;
@@ -803,7 +811,7 @@ static int include_glob(struct nft_ctx *nft, void *scanner, const char *pattern,
 			if (len == 0 || path[len - 1] == '/')
 				continue;
 
-			ret = include_file(nft, scanner, path, loc);
+			ret = include_file(nft, scanner, path, loc, indesc);
 			if (ret != 0)
 				goto err;
 		}
@@ -840,7 +848,7 @@ err:
 int scanner_read_file(struct nft_ctx *nft, const char *filename,
 		      const struct location *loc)
 {
-	return include_file(nft, nft->scanner, filename, loc);
+	return include_file(nft, nft->scanner, filename, loc, NULL);
 }
 
 static bool search_in_include_path(const char *filename)
-- 
2.20.1