* Allow escaped quotes in quoted strings, for example "\"some string\""

* Add warnings when we got errors while parsing rexeps

rspamd.conf.sample

@@ -132,7 +132,7 @@ delivery {
 };
 
 
-$to_blah = "To=/blah@blah/H";
+$to_blah = "To=/\"blah@blah\"/H";
 $from_blah = "From=/blah@blah/H";
 $subject_blah = "Subject=/blah/H";
 

src/cfg_file.h

@@ -312,6 +312,12 @@ struct rspamd_regexp* parse_regexp (memory_pool_t *pool, char *line);
  */
 struct expression* parse_expression (memory_pool_t *pool, char *line);
 
+/**
+ * Replace all \" with a single " in given string
+ * @param line input string
+ */
+void unescape_quotes (char *line);
+
 int yylex (void);
 int yyparse (void);
 void yyrestart (FILE *);

src/cfg_file.l

@@ -87,7 +87,7 @@ statfile_pool_size				return STATFILE_POOL_SIZE;
 yes|YES|no|NO|[yY]|[nN]			yylval.flag=parse_flag(yytext); return FLAG;
 \n								/* ignore EOL */;
 [ \t]+							/* ignore whitespace */;
-\"[^"]+\"						yylval.string=strdup(yytext + 1); yylval.string[strlen(yylval.string) - 1] = '\0'; return QUOTEDSTRING;
+\".+[^\\]\"						yylval.string=strdup(yytext + 1); yylval.string[strlen(yylval.string) - 1] = '\0'; unescape_quotes(yylval.string); return QUOTEDSTRING;
 \"								return QUOTE;
 \$[a-zA-Z_][a-zA-Z0-9_]+		yylval.string=strdup(yytext + 1); return VARIABLE;
 [0-9]+							yylval.number=strtol(yytext, NULL, 10); return NUMBER;
@@ -148,7 +148,7 @@ yes|YES|no|NO|[yY]|[nN]			yylval.flag=parse_flag(yytext); return FLAG;
 <module>=	return EQSIGN;
 <module>[a-zA-Z0-9_%-]+	yylval.string=strdup(yytext); return PARAM;
 <module>\$[a-zA-Z_][a-zA-Z0-9_]+		yylval.string=strdup(yytext + 1); return VARIABLE;
-<module>\"[^"]+\"	yylval.string=strdup(yytext + 1); yylval.string[strlen(yylval.string) - 1] = '\0'; return QUOTEDSTRING;
+<module>\".+[^\\]\"	yylval.string=strdup(yytext + 1); yylval.string[strlen(yylval.string) - 1] = '\0'; unescape_quotes(yylval.string); return QUOTEDSTRING;
 
 %%
 /* 

src/cfg_utils.c

@@ -567,6 +567,7 @@ parse_regexp (memory_pool_t *pool, char *line)
 		line ++;
 	}
 	if (line == '\0') {
+		msg_warn ("parse_regexp: got empty regexp");
 		return NULL;
 	}
 	/* First try to find header name */
@@ -593,6 +594,7 @@ parse_regexp (memory_pool_t *pool, char *line)
 	}
 	else {
 		/* We got header name earlier but have not found // expression, so it is invalid regexp */
+		msg_warn ("parse_regexp: got no header name (eg. header=) but without corresponding regexp");
 		return NULL;
 	}
 	/* Find end */
@@ -601,6 +603,7 @@ parse_regexp (memory_pool_t *pool, char *line)
 		end ++;
 	}
 	if (end == begin || *end != '/') {
+		msg_warn ("parse_regexp: no trailing / in regexp");
 		return NULL;
 	}
 	/* Parse flags */
@@ -675,6 +678,11 @@ parse_regexp (memory_pool_t *pool, char *line)
 	memory_pool_add_destructor (pool, (pool_destruct_func)g_regex_unref, (void *)result->regexp);
 	*end = '/';
 
+	if (result->regexp == NULL || err != NULL) {
+		msg_warn ("parse_regexp: could not read regexp: %s", err->message);
+		return NULL;
+	}
+
 	return result;
 }
 
@@ -712,6 +720,22 @@ parse_warn (const char *fmt, ...)
 	g_warning ("%s", logbuf);
 }
 
+void
+unescape_quotes (char *line)
+{
+	char *c = line, *t;
+
+	while (*c) {
+		if (*c == '\\' && *(c + 1) == '"') {
+			t = c;
+			while (*t) {
+				*t = *(t + 1);
+				t ++;
+			}
+		}
+		c ++;
+	}
+}
 
 /*
  * vi:ts=4

src/plugins/regexp.c

@@ -80,6 +80,9 @@ read_regexp_expression (memory_pool_t *pool, struct regexp_module_item *chain, c
 	struct expression *e, *cur;
 
 	e = parse_expression (regexp_module_ctx->regexp_pool, line);
+	if (e == NULL) {
+		msg_err ("read_regexp_extension: %s is invalid regexp extension", line);
+	}
 	chain->expr = e;
 	cur = e;
 	while (cur) {