tpws: save some memory by using sockaddr_in64

tpws/helpers.c

@@ -183,6 +183,10 @@ void sacopy(struct sockaddr_storage *sa_dest, const struct sockaddr *sa)
 			sa_dest->ss_family = 0;
 	}
 }
+void sa46copy(sockaddr_in46 *sa_dest, const struct sockaddr *sa)
+{
+	sacopy((struct sockaddr_storage*)sa_dest, sa);
+}
 
 bool is_localnet(const struct sockaddr *a)
 {

tpws/helpers.h

@@ -8,6 +8,14 @@
 #include <stdio.h>
 #include <time.h>
 
+// this saves memory. sockaddr_storage is larger than required. it can be 128 bytes. sockaddr_in6 is 28 bytes.
+typedef union
+{
+	struct sockaddr_in sa4;		// size 16
+	struct sockaddr_in6 sa6;	// size 28
+	char _align[32];		// force 16-byte alignment for ip6_and int128 ops
+} sockaddr_in46;
+
 void rtrim(char *s);
 char *strncasestr(const char *s,const char *find, size_t slen);
 
@@ -27,6 +35,7 @@ uint16_t saport(const struct sockaddr *sa);
 bool saconvmapped(struct sockaddr_storage *a);
 
 void sacopy(struct sockaddr_storage *sa_dest, const struct sockaddr *sa);
+void sa46copy(sockaddr_in46 *sa_dest, const struct sockaddr *sa);
 
 bool is_localnet(const struct sockaddr *a);
 bool is_linklocal(const struct sockaddr_in6* a);

tpws/resolver.c

@@ -103,6 +103,12 @@ static void *resolver_thread(void *arg)
 				ri->ga_res = getaddrinfo(ri->dom,sport,&hints,&ai);
 				if (!ri->ga_res)
 				{
+					if (ai->ai_addrlen>sizeof(ri->ss))
+					{
+						DLOG_ERR("getaddrinfo returned too large address\n");
+						ri->ga_res = EAI_FAIL;
+					}
+					else
 						memcpy(&ri->ss, ai->ai_addr, ai->ai_addrlen);
 					freeaddrinfo(ai);
 				}

tpws/resolver.h

@@ -6,10 +6,12 @@
 #include <sys/socket.h>
 #include <netdb.h>
 
+#include "helpers.h"
+
 struct resolve_item
 {
 	char dom[256];	// request dom
-	struct sockaddr_storage ss; // resolve result
+	sockaddr_in46 ss; // resolve result
 	int ga_res;	// getaddrinfo result code
 	uint16_t port;	// request port
 	void *ptr;

tpws/tpws_conn.c

@@ -619,7 +619,7 @@ static tproxy_conn_t* add_tcp_connection(int efd, struct tailhead *conn_list,int
 
 	if (proxy_type==CONN_TYPE_TRANSPARENT)
 	{
-		sacopy(&conn->dest, (struct sockaddr *)&orig_dst);
+		sa46copy(&conn->dest, (struct sockaddr *)&orig_dst);
 
 		if(!(conn->partner = new_conn(remote_fd, true)))
 		{
@@ -693,7 +693,7 @@ static bool check_connection_attempt(tproxy_conn_t *conn, int efd)
 	{
 		if (params.debug>=1)
 		{
-			struct sockaddr_storage sa;
+			sockaddr_in46 sa;
 			socklen_t salen=sizeof(sa);
 			char ip_port[48];
 
@@ -920,7 +920,7 @@ static bool handle_proxy_mode(tproxy_conn_t *conn, struct tailhead *conn_list)
 							socks4_send_rep(conn->fd, S4_REP_FAILED);
 							return false;
 						}
-						conn->dest.ss_family = AF_INET;
+						((struct sockaddr_in*)&conn->dest)->sin_family = AF_INET;
 						((struct sockaddr_in*)&conn->dest)->sin_port = m->port;
 						((struct sockaddr_in*)&conn->dest)->sin_addr.s_addr = m->ip;
 						return proxy_mode_connect_remote(conn, conn_list);
@@ -952,12 +952,12 @@ static bool handle_proxy_mode(tproxy_conn_t *conn, struct tailhead *conn_list)
 						switch(m->atyp)
 						{
 							case S5_ATYP_IP4:
-								conn->dest.ss_family = AF_INET;
+								((struct sockaddr_in*)&conn->dest)->sin_family = AF_INET;
 								((struct sockaddr_in*)&conn->dest)->sin_port = m->d4.port;
 								((struct sockaddr_in*)&conn->dest)->sin_addr = m->d4.addr;
 								break;
 							case S5_ATYP_IP6:
-								conn->dest.ss_family = AF_INET6;
+								((struct sockaddr_in6*)&conn->dest)->sin6_family = AF_INET6;
 								((struct sockaddr_in6*)&conn->dest)->sin6_port = m->d6.port;
 								((struct sockaddr_in6*)&conn->dest)->sin6_addr = m->d6.addr;
 								((struct sockaddr_in6*)&conn->dest)->sin6_flowinfo = 0;
@@ -1037,7 +1037,7 @@ static bool resolve_complete(struct resolve_item *ri, struct tailhead *conn_list
 					DBGPRINT("resolve_complete put hostname : %s\n", ri->dom);
 					conn->track.hostname = strdup(ri->dom);
 				}
-				sacopy(&conn->dest, (struct sockaddr *)&ri->ss);
+				sa46copy(&conn->dest, (struct sockaddr *)&ri->ss);
 				return proxy_mode_connect_remote(conn,conn_list);
 			}
 		}

tpws/tpws_conn.h

@@ -54,7 +54,7 @@ struct tproxy_conn
 	int splice_pipe[2];
 	conn_state_t state;
 	conn_type_t conn_type;
-	struct sockaddr_storage dest;
+	sockaddr_in46 src, dest;
 
 	struct tproxy_conn *partner; // other leg
 	time_t orphan_since;