diff --git a/client.cpp b/client.cpp
index 5ef323a..64505a7 100644
--- a/client.cpp
+++ b/client.cpp
@@ -10,7 +10,6 @@
 
 int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is ready in epoll
 {
-	//keep_iptables_rule();
 	packet_info_t &send_info=conn_info.raw_info.send_info;
 	packet_info_t &recv_info=conn_info.raw_info.recv_info;
 	raw_info_t &raw_info=conn_info.raw_info;
@@ -117,7 +116,6 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
 				mylog(log_info,"state changed from client_idle to client_tcp_handshake\n");
 			}
 
-
 		}
 		conn_info.last_state_time=get_current_time();
 		conn_info.last_hb_sent_time=0;
@@ -321,7 +319,6 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
 
 	if(conn_info.state.client_current_state==client_idle )
 	{
-
 		discard_raw_packet();
 		//recv(raw_recv_fd, 0,0, 0  );
 	}
@@ -354,7 +351,6 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
 				mylog(log_info,"state changed from client_tcp_dummy to client_handshake1\n");
 				//send_info.ack_seq=recv_info.seq+1;
 			}
-
 			conn_info.state.client_current_state = client_handshake1;
 
 			conn_info.last_state_time = get_current_time();
@@ -385,17 +381,14 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
 			mylog(log_debug,"too short to be a handshake\n");
 			return -1;
 		}
-		//id_t tmp_oppsite_id=  ntohl(* ((u32_t *)&data[0]));
 		my_id_t tmp_oppsite_id;
 		memcpy(&tmp_oppsite_id,&data[0],sizeof(tmp_oppsite_id));
 		tmp_oppsite_id=ntohl(tmp_oppsite_id);
 
-		//id_t tmp_my_id=ntohl(* ((u32_t *)&data[sizeof(id_t)]));
 		my_id_t tmp_my_id;
 		memcpy(&tmp_my_id,&data[sizeof(my_id_t)],sizeof(tmp_my_id));
 		tmp_my_id=ntohl(tmp_my_id);
 
-		//id_t tmp_oppsite_const_id=ntohl(* ((u32_t *)&data[sizeof(id_t)*2]));
 		my_id_t tmp_oppsite_const_id;
 		memcpy(&tmp_oppsite_const_id,&data[sizeof(my_id_t)*2],sizeof(tmp_oppsite_const_id));
 		tmp_oppsite_const_id=ntohl(tmp_oppsite_const_id);
@@ -424,7 +417,6 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
 
 		mylog(log_info,"changed state from to client_handshake1 to client_handshake2,my_id is %x,oppsite id is %x\n",conn_info.my_id,conn_info.oppsite_id);
 
-		//send_handshake(raw_info,conn_info.my_id,conn_info.oppsite_id,const_id);  //////////////send
 		conn_info.state.client_current_state = client_handshake2;
 		conn_info.last_state_time = get_current_time();
 		conn_info.last_hb_sent_time=0;
@@ -467,7 +459,6 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
 			if(hb_mode==0)
 				conn_info.last_hb_recv_time=get_current_time();
 
-			//u32_t tmp_conv_id= ntohl(* ((u32_t *)&data[0]));
 			u32_t tmp_conv_id;
 			memcpy(&tmp_conv_id,&data[0],sizeof(tmp_conv_id));
 			tmp_conv_id=ntohl(tmp_conv_id);
@@ -481,7 +472,6 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
 			conn_info.blob->conv_manager.c.update_active_time(tmp_conv_id);
 
 			//u64_t u64=conn_info.blob->conv_manager.c.find_data_by_conv(tmp_conv_id);
-
 			address_t tmp_addr=conn_info.blob->conv_manager.c.find_data_by_conv(tmp_conv_id);
 
 			//sockaddr_in tmp_sockaddr={0};
@@ -542,7 +532,6 @@ int client_on_udp_recv(conn_info_t &conn_info)
 	tmp_addr.from_sockaddr((sockaddr *)&udp_new_addr_in,udp_new_addr_len);
 	u32_t conv;
 
-	//u64_t u64;//////todo
 	if(!conn_info.blob->conv_manager.c.is_data_used(tmp_addr))
 	{
 		if(conn_info.blob->conv_manager.c.get_size() >=max_conv_num)
@@ -788,6 +777,5 @@ int client_event_loop()
 	}
 
 	ev_run(loop, 0);
-
 	return 0;
 }
diff --git a/common.cpp b/common.cpp
index 55b3cf2..dbb2bb1 100644
--- a/common.cpp
+++ b/common.cpp
@@ -9,9 +9,10 @@
 #include "log.h"
 #include "misc.h"
 
+#include <random>
+#include <cmath>
 
 //static int random_number_fd=-1;
-
 int force_socket_buf=0;
 
 int address_t::from_str(char *str)
@@ -322,15 +323,12 @@ int my_ip_t::from_address_t(address_t tmp_addr)
 int my_ip_t::from_str(char * str)
 {
 	u32_t type;
-
 	if(strchr(str,':')==NULL)
 		type=AF_INET;
 	else
 		type=AF_INET6;
-
 	int ret;
 	ret=inet_pton(type, str,this);
-
 	if(ret==0)  // 0 if address type doesnt match
 	{
 		mylog(log_error,"confusion in parsing %s, %d\n",str,ret);
@@ -454,7 +452,6 @@ u64_t get_true_random_number_64()
 		mylog(log_fatal,"get random number failed %d\n",size);
 		myexit(-1);
 	}
-
 	return ret;
 }
 u32_t get_true_random_number()
@@ -478,6 +475,11 @@ u32_t get_true_random_number_nz() //nz for non-zero
 	return ret;
 }
 
+inline int is_big_endian()
+{
+    int i=1;
+    return ! *((char *)&i);
+}
 u64_t ntoh64(u64_t a)
 {
 	#ifdef UDP2RAW_LITTLE_ENDIAN
@@ -495,7 +497,6 @@ u64_t hton64(u64_t a)
 	return ntoh64(a);
 }
 
-
 void write_u16(char * p,u16_t w)
 {
 	*(unsigned char*)(p + 1) = (w & 0xff);
@@ -562,7 +563,6 @@ void setnonblocking(int sock) {
 #endif
 }
 
-
 /*
     Generic checksum calculation function
 */
@@ -641,12 +641,12 @@ int set_buf_size(int fd,int socket_buf_size)
 	{
 		if(setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &socket_buf_size, sizeof(socket_buf_size))<0)
 		{
-			mylog(log_fatal,"SO_SNDBUF fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			mylog(log_fatal,"SO_SNDBUF fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,get_sock_error());
 			myexit(1);
 		}
 		if(setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &socket_buf_size, sizeof(socket_buf_size))<0)
 		{
-			mylog(log_fatal,"SO_RCVBUF fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			mylog(log_fatal,"SO_RCVBUF fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,get_sock_error());
 			myexit(1);
 		}
 	}
@@ -1096,7 +1096,6 @@ void print_binary_chars(const char * a,int len)
 	log_bare(log_debug,"\n");
 }
 
-
 u32_t djb2(unsigned char *str,int len)
 {
 	 u32_t hash = 5381;
@@ -1123,6 +1122,3 @@ u32_t sdbm(unsigned char *str,int len)
      //hash=htonl(hash);
      return hash;
  }
-
-
-
diff --git a/connection.cpp b/connection.cpp
index aef1db6..d225036 100644
--- a/connection.cpp
+++ b/connection.cpp
@@ -9,7 +9,6 @@
 #include "encrypt.h"
 #include "fd_manager.h"
 
-
 int disable_anti_replay=0;//if anti_replay windows is diabled
 
 
@@ -346,7 +345,6 @@ int conn_manager_t::clear_inactive0()
 
 
 
-
 int send_bare(raw_info_t &raw_info,const char* data,int len)//send function with encryption but no anti replay,this is used when client and server verifys each other
 //you have to design the protocol carefully, so that you wont be affect by relay attack
 {
@@ -594,7 +592,8 @@ int reserved_parse_safer(conn_info_t &conn_info,const char * input,int input_len
 	}
 	else
 	{
-		assert(0==1);
+		mylog(log_fatal,"unknow hb_mode\n");
+		myexit(-1);
 	}
 
 
diff --git a/fd_manager.cpp b/fd_manager.cpp
index 67d75bd..c9472d7 100644
--- a/fd_manager.cpp
+++ b/fd_manager.cpp
@@ -30,7 +30,8 @@ void fd_manager_t::fd64_close(fd64_t fd64)
 	{
 		fd_info_mp.erase(fd64);
 	}
-	assert(close(fd)==0);
+	//assert(close(fd)==0);
+	sock_close(fd);
 }
 void fd_manager_t::reserve(int n)
 {
diff --git a/main.cpp b/main.cpp
index d61fc4f..9403c41 100755
--- a/main.cpp
+++ b/main.cpp
@@ -26,23 +26,9 @@ void sigint_cb(struct ev_loop *l, ev_signal *w, int revents)
 
 int client_event_loop();
 int server_event_loop();
-/*
-int test()
-{
 
-	char ip_str[100]="8.8.8.8";
-	u32_t ip=inet_addr(ip_str);
-	u32_t dest_ip;
-	string if_name;
-	string hw;
-	find_lower_level_info(ip,dest_ip,if_name,hw);
-	printf("%s %s %s\n",my_ntoa(dest_ip),if_name.c_str(),hw.c_str());
-	exit(0);
-	return 0;
-}*/
 int main(int argc, char *argv[])
 {
-
 	assert(sizeof(unsigned short)==2);
 	assert(sizeof(unsigned int)==4);
 	assert(sizeof(unsigned long long)==8);
@@ -79,7 +65,6 @@ int main(int argc, char *argv[])
 		signal(SIGTERM, signal_handler);
 		signal(SIGQUIT, signal_handler);
 	}
-
 #if !defined(__MINGW32__)
 	if(geteuid() != 0)
 	{
@@ -91,7 +76,6 @@ int main(int argc, char *argv[])
 	}
 #endif
 
-
 	mylog(log_info,"remote_ip=[%s], make sure this is a vaild IP address\n",remote_addr.get_ip());
 
 	//init_random_number_fd();
diff --git a/misc.cpp b/misc.cpp
index 71e50f1..d4ccfcf 100644
--- a/misc.cpp
+++ b/misc.cpp
@@ -15,10 +15,8 @@
 
 int hb_mode=1;
 int hb_len=1200;
-
 char hb_buf[buf_len];
 
-
 int mtu_warn=1375;//if a packet larger than mtu warn is receviced,there will be a warning
 
 int max_rst_to_show=15;
@@ -91,6 +89,8 @@ int about_to_exit=0;
 
 
 int socket_buf_size=1024*1024;
+//int force_socket_buf=0;
+
 
 
 //char lower_level_arg[1000];
@@ -129,7 +129,6 @@ void print_help()
 	printf("udp2raw-tunnel\n");
 	printf("git version:%s    ",git_version_buf);
 	printf("build date:%s %s\n",__DATE__,__TIME__);
-
 	printf("repository: https://github.com/wangyu-/udp2raw-tunnel\n");
 	printf("\n");
 	printf("usage:\n");
@@ -199,7 +198,7 @@ int load_config(char *file_name, int &argc, vector<string> &argv) //load conf fi
 	std::string line;
 	if(conf_file.fail())
 	{
-		mylog(log_fatal,"conf_file %s open failed,reason :%s\n",file_name,strerror(errno));
+		mylog(log_fatal,"conf_file %s open failed,reason :%s\n",file_name,get_sock_error());
 		myexit(-1);
 	}
 	while(std::getline(conf_file,line))
@@ -419,7 +418,6 @@ void process_arg(int argc, char *argv[])  //process all options
 			} else {
 				mylog(log_fatal,"invalid parameter for -l ,%s,should be ip:port\n",optarg);
 				myexit(-1);
-
 			}*/
 			break;
 		case 'r':
@@ -483,7 +481,6 @@ void process_arg(int argc, char *argv[])  //process all options
 			{
 				clear_iptables=1;
 			}
-
 			else if(strcmp(long_options[option_index].name,"source-ip")==0)
 			{
 				mylog(log_debug,"parsing long option :source-ip\n");
@@ -604,6 +601,10 @@ void process_arg(int argc, char *argv[])  //process all options
 			{
 				//enable_log_color=0;
 			}
+			else if(strcmp(long_options[option_index].name,"enable-color")==0)
+			{
+				//enable_log_color=0;
+			}
 			else if(strcmp(long_options[option_index].name,"debug")==0)
 			{
 				debug_flag=1;
@@ -768,9 +769,6 @@ void process_arg(int argc, char *argv[])  //process all options
 		raw_ip_version=local_addr.get_type();
 	}
 
-	//if(lower_level)
-		//process_lower_level_arg();
-
 	 mylog(log_info,"important variables: ");
 
 	 log_bare(log_info,"log_level=%d:%s ",log_level,log_text[log_level]);
@@ -785,7 +783,7 @@ void process_arg(int argc, char *argv[])  //process all options
 
 	 if(force_source_ip)
 		 log_bare(log_info,"source_addr=%s ",source_addr.get_ip());
-	 
+
 	 if(force_source_port)
 		 log_bare(log_info,"source_port=%d ",source_port);
 
@@ -1191,7 +1189,6 @@ int set_timer_server(int epollfd,int &timer_fd,fd64_t &fd64)//only for server
 	return 0;
 }
 
-
 int handle_lower_level(raw_info_t &raw_info)//fill lower_level info,when --lower-level is enabled,only for server
 {
 	packet_info_t &send_info=raw_info.send_info;
@@ -1363,6 +1360,3 @@ void  signal_handler(int sig)
 	about_to_exit=1;
     // myexit(0);
 }
-
-
-