fixed possible alignment issue

common.cpp

@@ -330,12 +330,12 @@ int set_buf_size(int fd)
 {
     if(setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
     {
-    	mylog(log_fatal,"SO_SNDBUFFORCE fail,fd %d\n",fd);
+    	mylog(log_fatal,"SO_SNDBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
     	myexit(1);
     }
     if(setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
     {
-    	mylog(log_fatal,"SO_RCVBUFFORCE fail,fd %d\n",fd);
+    	mylog(log_fatal,"SO_RCVBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
     	myexit(1);
     }
 	return 0;
@@ -386,9 +386,15 @@ int numbers_to_char(id_t id1,id_t id2,id_t id3,char * &data,int &len)
 int char_to_numbers(const char * data,int len,id_t &id1,id_t &id2,id_t &id3)
 {
 	if(len<int(sizeof(id_t)*3)) return -1;
-	id1=ntohl(  *((id_t*)(data+0)) );
-	id2=ntohl(  *((id_t*)(data+sizeof(id_t))) );
-	id3=ntohl(  *((id_t*)(data+sizeof(id_t)*2)) );
+	//id1=ntohl(  *((id_t*)(data+0)) );
+	memcpy(&id1,data+0,sizeof(id1));
+	id1=ntohl(id1);
+	//id2=ntohl(  *((id_t*)(data+sizeof(id_t))) );
+	memcpy(&id2,data+sizeof(id_t),sizeof(id2));
+	id2=ntohl(id2);
+	//id3=ntohl(  *((id_t*)(data+sizeof(id_t)*2)) );
+	memcpy(&id3,data+sizeof(id_t)*2,sizeof(id3));
+	id3=ntohl(id3);
 	return 0;
 }
 int hex_to_u32(const string & a,u32_t &output)

doc/README.zh-cn.md

@@ -159,6 +159,10 @@ facktcp模式并没有模拟tcp的全部。所以理论上有办法把faketcp和
 在client 端，运行`traceroute <server_ip>`，记下第一跳的地址，这个就是`网关ip`。再运行`arp -s <网关ip>`，可以同时查到出口网卡名和mac。
 
 ![](/images/lower_level.PNG)
+
+如果traceroute第一跳结果是`* * *`，说明网关屏蔽了对traceroute的应答。需要用`ip route`或`route`查询网关：
+
+![](/images/route.PNG)
 ##### server端获得--lower-level参数的办法
 如果client有公网ip，就`traceroute <client_ip>`。下一步和client端的方法一样。
 

main.cpp

@@ -787,9 +787,9 @@ int send_data_safer(conn_info_t &conn_info,const char* data,int len,u32_t conv_n
 }
 int parse_safer(conn_info_t &conn_info,const char * input,int input_len,char &type,char* &data,int &len)//subfunction for recv_safer,allow overlap
 {
-	 static char recv_data_buf0[buf_len];
+	 static char recv_data_buf[buf_len];
 
-	 char *recv_data_buf=recv_data_buf0; //fix strict alias warning
+	// char *recv_data_buf=recv_data_buf0; //fix strict alias warning
 	if(my_decrypt(input,recv_data_buf,input_len,key)!=0)
 	{
 		//printf("decrypt fail\n");
@@ -799,15 +799,24 @@ int parse_safer(conn_info_t &conn_info,const char * input,int input_len,char &ty
 
 
 	//char *a=recv_data_buf;
-	id_t h_oppiste_id= ntohl (  *((id_t * )(recv_data_buf)) );
+	//id_t h_oppiste_id= ntohl (  *((id_t * )(recv_data_buf)) );
+	id_t h_oppsite_id;
+	memcpy(&h_oppsite_id,recv_data_buf,sizeof(h_oppsite_id));
+	h_oppsite_id=ntohl(h_oppsite_id);
 
-	id_t h_my_id= ntohl (  *((id_t * )(recv_data_buf+sizeof(id_t)))    );
+	//id_t h_my_id= ntohl (  *((id_t * )(recv_data_buf+sizeof(id_t)))    );
+	id_t h_my_id;
+	memcpy(&h_my_id,recv_data_buf+sizeof(id_t),sizeof(h_my_id));
+	h_my_id=ntohl(h_my_id);
 
-	anti_replay_seq_t h_seq= ntoh64 (  *((anti_replay_seq_t * )(recv_data_buf  +sizeof(id_t) *2 ))   );
+	//anti_replay_seq_t h_seq= ntoh64 (  *((anti_replay_seq_t * )(recv_data_buf  +sizeof(id_t) *2 ))   );
+	anti_replay_seq_t h_seq;
+	memcpy(&h_seq,recv_data_buf  +sizeof(id_t) *2 ,sizeof(h_seq));
+	h_seq=ntoh64(h_seq);
 
-	if(h_oppiste_id!=conn_info.oppsite_id||h_my_id!=conn_info.my_id)
+	if(h_oppsite_id!=conn_info.oppsite_id||h_my_id!=conn_info.my_id)
 	{
-		mylog(log_debug,"id and oppsite_id verification failed %x %x %x %x \n",h_oppiste_id,conn_info.oppsite_id,h_my_id,conn_info.my_id);
+		mylog(log_debug,"id and oppsite_id verification failed %x %x %x %x \n",h_oppsite_id,conn_info.oppsite_id,h_my_id,conn_info.my_id);
 		return -1;
 	}
 
@@ -1331,9 +1340,20 @@ 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]));
-		id_t tmp_my_id=ntohl(* ((u32_t *)&data[sizeof(id_t)]));
-		id_t tmp_oppsite_const_id=ntohl(* ((u32_t *)&data[sizeof(id_t)*2]));
+		//id_t tmp_oppsite_id=  ntohl(* ((u32_t *)&data[0]));
+		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)]));
+		id_t tmp_my_id;
+		memcpy(&tmp_my_id,&data[sizeof(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]));
+		id_t tmp_oppsite_const_id;
+		memcpy(&tmp_oppsite_const_id,&data[sizeof(id_t)*2],sizeof(tmp_oppsite_const_id));
+		tmp_oppsite_const_id=ntohl(tmp_oppsite_const_id);
 
 		if(tmp_my_id!=conn_info.my_id)
 		{
@@ -1401,7 +1421,10 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
 
 			conn_info.last_hb_recv_time=get_current_time();
 
-			u32_t tmp_conv_id= ntohl(* ((u32_t *)&data[0]));
+			//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);
 
 			if(!conn_info.blob->conv_manager.is_conv_used(tmp_conv_id))
 			{
@@ -1566,7 +1589,11 @@ int server_on_raw_recv_multi() //called when server received an raw packet
 			return -1;
 		}
 
-		id_t zero=ntohl(* ((u32_t *)&data[sizeof(id_t)]));
+		//id_t zero=ntohl(* ((u32_t *)&data[sizeof(id_t)]));
+		id_t zero;
+		memcpy(&zero,&data[sizeof(id_t)],sizeof(zero));
+		zero=ntohl(zero);
+
 		if(zero!=0)
 		{
 			mylog(log_debug,"[%s]not a invalid initial handshake\n",ip_port);
@@ -1663,8 +1690,15 @@ int server_on_raw_recv_handshake1(conn_info_t &conn_info,char * ip_port,char * d
 		mylog(log_debug,"[%s] data_len=%d too short to be a handshake\n",ip_port,data_len);
 		return -1;
 	}
-	id_t tmp_oppsite_id=  ntohl(* ((u32_t *)&data[0]));
-	id_t tmp_my_id=ntohl(* ((u32_t *)&data[sizeof(id_t)]));
+	//id_t tmp_oppsite_id=  ntohl(* ((u32_t *)&data[0]));
+	id_t tmp_oppsite_id;
+	memcpy(&tmp_oppsite_id,(u32_t *)&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)]));
+	id_t tmp_my_id;
+	memcpy(&tmp_my_id,&data[sizeof(id_t)],sizeof(tmp_my_id));
+	tmp_my_id=ntohl(tmp_my_id);
 
 	if(tmp_my_id==0)  //received  init handshake again
 	{
@@ -1685,7 +1719,12 @@ int server_on_raw_recv_handshake1(conn_info_t &conn_info,char * ip_port,char * d
 	else if(tmp_my_id==conn_info.my_id)
 	{
 		conn_info.oppsite_id=tmp_oppsite_id;
-		id_t tmp_oppsite_const_id=ntohl(* ((u32_t *)&data[sizeof(id_t)*2]));
+		//id_t tmp_oppsite_const_id=ntohl(* ((u32_t *)&data[sizeof(id_t)*2]));
+
+		id_t tmp_oppsite_const_id;
+		memcpy(&tmp_oppsite_const_id,&data[sizeof(id_t)*2],sizeof(tmp_oppsite_const_id));
+		tmp_oppsite_const_id=ntohl(tmp_oppsite_const_id);
+
 
 		if(raw_mode==mode_faketcp)
 		{
@@ -1735,7 +1774,11 @@ int server_on_raw_recv_ready(conn_info_t &conn_info,char * ip_port,char type,cha
 	} else if (type== 'd' && data_len >=int( sizeof(u32_t) ))
 	{
 
-		u32_t tmp_conv_id = ntohl(*((u32_t *) &data[0]));
+		//u32_t tmp_conv_id = ntohl(*((u32_t *) &data[0]));
+		id_t tmp_conv_id;
+		memcpy(&tmp_conv_id,&data[0],sizeof(tmp_conv_id));
+		tmp_conv_id=ntohl(tmp_conv_id);
+
 
 		conn_info.last_hb_recv_time = get_current_time();
 

makefile

@@ -1,6 +1,7 @@
 cc_cross=/home/wangyu/Desktop/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 cc_local=g++
 cc_mips34kc=/toolchains/OpenWrt-SDK-ar71xx-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2/staging_dir/toolchain-mips_34kc_gcc-4.8-linaro_uClibc-0.9.33.2/bin/mips-openwrt-linux-g++
+#cc_arm= /toolchains/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-g++ -march=armv6 -marm 
 cc_arm= /toolchains/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 #cc_bcm2708=/home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ 
 FLAGS= -std=c++11 -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers

network.cpp

@@ -201,7 +201,7 @@ int init_raw_socket()
 
     if(setsockopt(raw_send_fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
     {
-    	mylog(log_fatal,"SO_SNDBUFFORCE fail\n");
+    	mylog(log_fatal,"SO_SNDBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
     	myexit(1);
     }
 
@@ -219,7 +219,7 @@ int init_raw_socket()
 
     if(setsockopt(raw_recv_fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
     {
-    	mylog(log_fatal,"SO_RCVBUFFORCE fail\n");
+    	mylog(log_fatal,"SO_RCVBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
     	myexit(1);
     }
 
@@ -844,8 +844,8 @@ int send_raw_tcp(raw_info_t &raw_info,const char * payload, int payloadlen) {
 
 	//mylog(log_debug,"syn %d\n",send_info.syn);
 
-	char send_raw_tcp_buf0[buf_len];
-	char *send_raw_tcp_buf=send_raw_tcp_buf0;
+	char send_raw_tcp_buf[buf_len];
+	//char *send_raw_tcp_buf=send_raw_tcp_buf0;
 
 	struct tcphdr *tcph = (struct tcphdr *) (send_raw_tcp_buf
 			+ sizeof(struct pseudo_header));
@@ -884,14 +884,20 @@ int send_raw_tcp(raw_info_t &raw_info,const char * payload, int payloadlen) {
 		send_raw_tcp_buf[i++] = 0x08;   //ts   i=6
 		send_raw_tcp_buf[i++] = 0x0a;   //i=7
 
-		*(u32_t*) (&send_raw_tcp_buf[i]) = htonl(
-				(u32_t) get_current_time());
+		//*(u32_t*) (&send_raw_tcp_buf[i]) = htonl(
+			//	(u32_t) get_current_time());
+
+		u32_t ts=htonl((u32_t) get_current_time());
+		memcpy(&send_raw_tcp_buf[i],&ts,sizeof(ts));
 
 		i += 4;
 
 		//mylog(log_info,"[syn]<send_info.ts_ack= %u>\n",send_info.ts_ack);
 
-		*(u32_t*) (&send_raw_tcp_buf[i]) = htonl(send_info.ts_ack);
+		//*(u32_t*) (&send_raw_tcp_buf[i]) = htonl(send_info.ts_ack);
+		u32_t ts_ack=htonl(send_info.ts_ack);
+		memcpy(&send_raw_tcp_buf[i],&ts_ack,sizeof(ts_ack));
+
 		i += 4;
 
 		send_raw_tcp_buf[i++] = 0x01;
@@ -908,14 +914,19 @@ int send_raw_tcp(raw_info_t &raw_info,const char * payload, int payloadlen) {
 		send_raw_tcp_buf[i++] = 0x08;  //ts   //i=2
 		send_raw_tcp_buf[i++] = 0x0a; 		  //i=3;
 
-		*(u32_t*) (&send_raw_tcp_buf[i]) = htonl(
-				(u32_t) get_current_time());
+		//*(u32_t*) (&send_raw_tcp_buf[i]) = htonl(
+			//	(u32_t) get_current_time());
+
+		u32_t ts=htonl((u32_t) get_current_time());
+		memcpy(&send_raw_tcp_buf[i],&ts,sizeof(ts));
 
 		i += 4;
 
 		//mylog(log_info,"<send_info.ts_ack= %u>\n",send_info.ts_ack);
 
-		*(u32_t*) (&send_raw_tcp_buf[i]) = htonl(send_info.ts_ack);
+		//*(u32_t*) (&send_raw_tcp_buf[i]) = htonl(send_info.ts_ack);
+		u32_t ts_ack=htonl(send_info.ts_ack);
+		memcpy(&send_raw_tcp_buf[i],&ts_ack,sizeof(ts_ack));
 		i += 4;
 	}
 
@@ -1334,8 +1345,14 @@ int recv_raw_tcp(raw_info_t &raw_info,char * &payload,int &payloadlen)
     	if(tcp_option[6]==0x08 &&tcp_option[7]==0x0a)
     	{
     		recv_info.has_ts=1;
-    		recv_info.ts=ntohl(*(u32_t*)(&tcp_option[8]));
-    		recv_info.ts_ack=ntohl(*(u32_t*)(&tcp_option[12]));
+    		//recv_info.ts=ntohl(*(u32_t*)(&tcp_option[8]));
+    		memcpy(&recv_info.ts,&tcp_option[8],sizeof(recv_info.ts));
+    		recv_info.ts=ntohl(recv_info.ts);
+
+    		//recv_info.ts_ack=ntohl(*(u32_t*)(&tcp_option[12]));
+    		memcpy(&recv_info.ts_ack,&tcp_option[12],sizeof(recv_info.ts_ack));
+    		recv_info.ts_ack=ntohl(recv_info.ts_ack);
+
     		//g_packet_info_send.ts_ack= ntohl(*(uint32_t*)(&tcp_option[8]));
     	}
     	else
@@ -1348,8 +1365,12 @@ int recv_raw_tcp(raw_info_t &raw_info,char * &payload,int &payloadlen)
     	if(tcp_option[2]==0x08 &&tcp_option[3]==0x0a)
     	{
     		recv_info.has_ts=1;
-    		recv_info.ts=ntohl(*(u32_t*)(&tcp_option[4]));
-    		recv_info.ts_ack=ntohl(*(u32_t*)(&tcp_option[8]));
+    		//recv_info.ts=ntohl(*(u32_t*)(&tcp_option[4]));
+    		memcpy(&recv_info.ts,&tcp_option[4],sizeof(recv_info.ts));
+    		recv_info.ts=ntohl(recv_info.ts);
+    		//recv_info.ts_ack=ntohl(*(u32_t*)(&tcp_option[8]));
+    		memcpy(&recv_info.ts_ack,&tcp_option[8],sizeof(recv_info.ts_ack));
+    		recv_info.ts_ack=ntohl(recv_info.ts_ack);
     		//g_packet_info_send.ts_ack= ntohl(*(uint32_t*)(&tcp_option[0]));
     	}
     	else