diff --git a/libasyncns/asyncns.c b/libasyncns/asyncns.c
index e4993cb3..a270c188 100644
--- a/libasyncns/asyncns.c
+++ b/libasyncns/asyncns.c
@@ -645,7 +645,9 @@ static int process_worker(int in_fd, int out_fd) {
 
         if (!have_death_sig) {
             fd_set fds;
-            struct timeval tv = { 0, 5000000 };
+            struct timeval tv;
+            tv.tv_usec = 500000;
+            tv.tv_sec = 0;
 
             FD_ZERO(&fds);
             FD_SET(in_fd, &fds);
@@ -699,13 +701,17 @@ static void* thread_worker(void *p) {
 
             if (!asyncns->dead) {
                 fd_set fds;
-                struct timeval tv = { 0, 5000000 };
+                struct timeval tv;
+                tv.tv_usec = 500000;
+                tv.tv_sec = 0;
 
                 FD_ZERO(&fds);
                 FD_SET(in_fd, &fds);
 
-                if (select(in_fd+1, &fds, NULL, NULL, &tv) < 0)
+                if (select(in_fd+1, &fds, NULL, NULL, &tv) < 0) {
+                    perror("test");
                     break;
+                }
             }
 
             if (length < 0 &&
diff --git a/src/jconf.c b/src/jconf.c
index c069e1e0..f7e333ff 100644
--- a/src/jconf.c
+++ b/src/jconf.c
@@ -11,7 +11,7 @@
 
 static char *to_string(const json_value *value) {
     if (value->type == json_string) {
-        return strndup(value->u.string.ptr, value->u.string.length);
+        return ss_strndup(value->u.string.ptr, value->u.string.length);
     } else if (value->type == json_integer) {
         return strdup(itoa(value->u.integer));
     } else if (value->type == json_null) {
diff --git a/src/local.c b/src/local.c
index 85c6c2e1..54b9bc40 100644
--- a/src/local.c
+++ b/src/local.c
@@ -699,9 +699,9 @@ int main (int argc, char **argv) {
     listen_ctx.remote_host = malloc(sizeof(char *) * remote_num);
     while (remote_num > 0) {
         int index = --remote_num;
-        listen_ctx.remote_host[index] = strdup(remote_host[index]);
+        listen_ctx.remote_host[index] = remote_host[index];
     }
-    listen_ctx.remote_port = strdup(remote_port);
+    listen_ctx.remote_port = remote_port;
     listen_ctx.timeout = atoi(timeout);
     listen_ctx.fd = listenfd;
     listen_ctx.iface = iface;
diff --git a/src/redir.c b/src/redir.c
index 9ebf916d..d71f794e 100644
--- a/src/redir.c
+++ b/src/redir.c
@@ -624,9 +624,9 @@ int main (int argc, char **argv) {
     listen_ctx.remote_host = malloc(sizeof(char *) * remote_num);
     while (remote_num > 0) {
         int index = --remote_num;
-        listen_ctx.remote_host[index] = strdup(remote_host[index]);
+        listen_ctx.remote_host[index] = remote_host[index];
     }
-    listen_ctx.remote_port = strdup(remote_port);
+    listen_ctx.remote_port = remote_port;
     listen_ctx.timeout = atoi(timeout);
     listen_ctx.fd = listenfd;
 
diff --git a/src/utils.c b/src/utils.c
index 1fd5a92e..116c02c4 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -43,6 +43,17 @@ char *itoa(int i) {
     return p;
 }
 
+char *ss_strndup(const char *s, size_t n) {
+    size_t len = strlen(s);
+    char *ret;
+
+    if (len <= n) return strdup(s);
+
+    ret = malloc(n + 1);
+    strncpy(ret, s, n);
+    ret[n] = '\0';
+    return ret;
+}
 
 void FATAL(const char *msg) {
     LOGE("%s", msg);
@@ -109,6 +120,5 @@ void demonize(const char* path) {
     close(STDIN_FILENO);
     close(STDOUT_FILENO);
     close(STDERR_FILENO);
-
 }
 
diff --git a/src/utils.h b/src/utils.h
index c9dad763..1b5560af 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -35,5 +35,6 @@ void ERROR(const char *s);
 void usage(void);
 void demonize(const char* path);
 char *itoa(int i);
+char *ss_strndup(const char *s, size_t n);
 
 #endif // _UTILS_H