Partial implementation of a config files parser

1 files changed, 57 insertions, 0 deletions

diff --git a/src/config.l b/src/config.l
new file mode 100644
index 0000000..e9dd235
--- /dev/null
+++ b/src/config.l
@@ -0,0 +1,57 @@
+%option prefix="fastd_config_"
+%option noyywrap
+%option bison-bridge
+%option reentrant
+
+%top {
+	 #include <fastd.h>
+	 #include <config.yy.h>
+	 #define YY_DECL int fastd_config_lex(YYSTYPE *yylval_param, fastd_context *ctx, void *yyscanner)
+}
+
+%x STRING
+%x ADDR6
+
+%%
+[0-9]+		{ yylval->num = atoi(yytext); return TOK_INTEGER; }
+
+interface	{ yylval->str = yytext; return TOK_INTERFACE; }
+bind		{ yylval->str = yytext; return TOK_BIND; }
+mtu		{ yylval->str = yytext; return TOK_MTU; }
+mode		{ yylval->str = yytext; return TOK_MODE; }
+protocol	{ yylval->str = yytext; return TOK_PROTOCOL; }
+peer		{ yylval->str = yytext; return TOK_PEER; }
+
+[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3} {
+			if (!inet_pton(AF_INET, yytext, &yylval->addr))
+				exit_error(ctx, "config error: invalid address");
+
+			return TOK_ADDR;
+		}
+
+any		{ yylval->str = yytext; return TOK_ANY; }
+float		{ yylval->str = yytext; return TOK_FLOAT; }
+tap		{ yylval->str = yytext; return TOK_TAP; }
+tun		{ yylval->str = yytext; return TOK_TUN; }
+
+[A-Za-z_][A-Za-z0-9_]* { yylval->str = yytext; return TOK_IDENTIFIER; }
+
+[;:\{\}]	{ return *yytext; }
+
+[ \t\n]	;
+
+\"		BEGIN(STRING);
+<STRING>[^"]*	{ yylval->str = yytext; return TOK_STRING; }
+<STRING>\"	BEGIN(INITIAL);
+
+\[		BEGIN(ADDR6);
+<ADDR6>[^\]]+		{
+				if (!inet_pton(AF_INET6, yytext, &yylval->addr6))
+					exit_error(ctx, "config error: invalid address");
+
+				return TOK_ADDR6;
+			}
+<ADDR6>\]		BEGIN(INITIAL);
+
+<INITIAL,STRING,ADDR6>.		exit_error(ctx, "config error: invalid character");
+%%