starter: Add support for multi-line strings in ipsec.conf

src/starter/parser/lexer.l

@@ -123,16 +123,11 @@ static void include_files(parser_helper_t *ctx);
 <str>{
 	"\""				|
 	<<EOF>>				|
-	\n					|
 	\\					{
 		if (!streq(yytext, "\""))
 		{
-			if (streq(yytext, "\n"))
-			{	/* put the newline back to fix the line numbers */
-				unput('\n');
-				yy_set_bol(0);
-			}
 			PARSER_DBG1(yyextra, "unterminated string detected");
+			return STRING_ERROR;
 		}
 		if (yy_top_state(yyscanner) == inc)
 		{	/* string include */
@@ -152,7 +147,7 @@ static void include_files(parser_helper_t *ctx);
 	\\t     yyextra->string_add(yyextra, "\t");
 	\\\r?\n /* merge lines that end with EOL characters */
 	\\.     yyextra->string_add(yyextra, yytext+1);
-	[^\\\n"]+			{
+	[^\\"]+			{
 		yyextra->string_add(yyextra, yytext);
 	}
 }

src/starter/parser/parser.y

@@ -73,7 +73,7 @@ static int yylex(YYSTYPE *lvalp, parser_helper_t *ctx)
 	conf_parser_section_t t;
 }
 %token <s> STRING
-%token EQ SPACES NEWLINE CONFIG_SETUP CONN CA
+%token EQ SPACES NEWLINE CONFIG_SETUP CONN CA STRING_ERROR
 
 /* ...and other symbols */
 %type <t> section_type

src/starter/tests/suites/test_parser.c

@@ -328,6 +328,9 @@ static struct {
 	{ TRUE, "conn foo\n\tkey=val     ue", "foo", "val ue" },
 	{ TRUE, "conn foo\n\tkey=\"val   ue\"", "foo", "val   ue" },
 	{ TRUE, "conn foo\n\tkey=\"val\\nue\"", "foo", "val\nue" },
+	{ TRUE, "conn foo\n\tkey=\"val\nue\"", "foo", "val\nue" },
+	{ TRUE, "conn foo\n\tkey=\"val\\\nue\"", "foo", "value" },
+	{ FALSE, "conn foo\n\tkey=\"unterminated", "foo", NULL },
 };
 
 START_TEST(test_strings)