dns_conf: fix bind option out-of-bounds issue

Author: pymumu

src/dns_conf.c

@@ -2999,9 +2999,12 @@ static int _bind_is_ip_valid(const char *ip)
 	struct sockaddr_storage addr;
 	socklen_t addr_len = sizeof(addr);
 	char ip_check[MAX_IP_LEN];
-	int port_check = 0;
+	int port_check = -1;
 
 	if (parse_ip(ip, ip_check, &port_check) != 0) {
+		if (port_check != -1 && ip_check[0] == '\0') {
+			return 0;
+		}
 		return -1;
 	}
 
@@ -3048,12 +3051,12 @@ static int _config_bind_ip(int argc, char *argv[], DNS_BIND_TYPE type)
 	};
 	/* clang-format on */
 	if (argc <= 1) {
-		tlog(TLOG_ERROR, "invalid parameter.");
+		tlog(TLOG_ERROR, "bind: invalid parameter.");
 		goto errout;
 	}
 
 	ip = argv[1];
-	if (index >= DNS_MAX_SERVERS) {
+	if (index >= DNS_MAX_BIND_IP) {
 		tlog(TLOG_WARN, "exceeds max server number, %s", ip);
 		return 0;
 	}
@@ -3073,7 +3076,7 @@ static int _config_bind_ip(int argc, char *argv[], DNS_BIND_TYPE type)
 			continue;
 		}
 
-		tlog(TLOG_WARN, "Bind server %s, type %d, already configured, skip.", ip, type);
+		tlog(TLOG_WARN, "bind server %s, type %d, already configured, skip.", ip, type);
 		return 0;
 	}
 

src/dns_conf.h

@@ -34,7 +34,7 @@
 extern "C" {
 #endif
 
-#define DNS_MAX_BIND_IP 16
+#define DNS_MAX_BIND_IP 32
 #define DNS_MAX_SERVERS 64
 #define DNS_MAX_SERVER_NAME_LEN 128
 #define DNS_MAX_PTR_LEN 128

src/dns_server.c

@@ -8973,6 +8973,8 @@ static int _dns_server_socket(void)
 
 	for (i = 0; i < dns_conf_bind_ip_num; i++) {
 		struct dns_bind_ip *bind_ip = &dns_conf_bind_ip[i];
+		tlog(TLOG_INFO, "bind ip %s, type %d", bind_ip->ip, bind_ip->type);
+		
 		switch (bind_ip->type) {
 		case DNS_BIND_TYPE_UDP:
 			if (_dns_server_socket_udp(bind_ip) != 0) {