diff --git a/src/dns.c b/src/dns.c
index dea7479..5c5945d 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -81,8 +81,7 @@ char** ipv6_dns_resolve(char *domain) { // DNS解析IPv6地址
 
 char* dns_resolve(char *domain) { // DNS解析 返回首个IP地址 IPv4优先
     int num = 0;
-    char **result = init_dns_result();
-    result = ipv4_dns_resolve(domain); // IPv4解析
+    char **result = ipv4_dns_resolve(domain); // IPv4解析
     while(result[num++] != NULL); // num - 1 为IPv4地址数
     if (num - 1 != 0) { // 存在IPv4解析
         char *tmp = strcpy((char*)malloc(strlen(result[0]) + 1), result[0]);
diff --git a/src/network.c b/src/network.c
index d262806..f7541d8 100644
--- a/src/network.c
+++ b/src/network.c
@@ -49,7 +49,7 @@ int get_random_num(int range_start, int range_end) { // create a random number i
     struct timeval tp;
     gettimeofday(&tp, NULL);
     srand(tp.tv_usec);
-    return range_start + (rand() % (range_end - range_start + 1));
+    return range_start + (rand() % (range_end - range_start + 1)); // NOLINT (randomness is enough for us)
 }
 
 int check_port_available(unsigned int port, int is_udp, int is_ipv6) { // test a port is available or not
@@ -291,8 +291,7 @@ void proxy(char *server_ip, int server_port, char *listen_ip, int listen_port) {
     pthread_t tid;
     long recv_len;
     char recv_buffer[BUFFER_SIZE]; // 接收缓冲区
-    int ipv4_client_fd = -1;
-    int ipv6_client_fd = -1;
+    int ipv4_client_fd, ipv6_client_fd;
     struct sockaddr_in ipv4_client_addr;
     struct sockaddr_in6 ipv6_client_addr;
     socklen_t ipv4_client_addr_len = sizeof(ipv4_client_addr);
diff --git a/src/process.c b/src/process.c
index 34e924c..65bdcf8 100644
--- a/src/process.c
+++ b/src/process.c
@@ -1,4 +1,6 @@
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <glib.h>
 #include <stdio.h>
 #include <unistd.h>
@@ -217,9 +219,9 @@ void start_bootstrap(char *ss_type, int is_udp_proxy) { // start shadowsocks and
             printf("[Shadowsocks Bootstrap] Skip UDP Proxy.\n");
         } else { // udp proxy
             if (!strcmp(ss_type, "sslocal")) { // local mode
-                proxy(remote_ip, atoi(SS_REMOTE_PORT), SS_LOCAL_HOST, atoi(SS_LOCAL_PORT));
+                proxy(remote_ip, atoi(SS_REMOTE_PORT), SS_LOCAL_HOST, atoi(SS_LOCAL_PORT)); // NOLINT
             } else { // server mode
-                proxy(SS_LOCAL_HOST, atoi(SS_LOCAL_PORT), remote_ip, atoi(SS_REMOTE_PORT));
+                proxy(SS_LOCAL_HOST, atoi(SS_LOCAL_PORT), remote_ip, atoi(SS_REMOTE_PORT)); // NOLINT
             }
         }
     } else {