Reconstruct src addr for P2P usage

src/udprelay.c

@@ -192,7 +192,7 @@ hash_key(const int af, const struct sockaddr_storage *addr)
     return key;
 }
 
-#if defined(MODULE_REDIR)
+#if defined(MODULE_REDIR) || defined(MODULE_REMOTE)
 static int
 construct_udprelay_header(const struct sockaddr_storage *in_addr,
                           char *addr_header)
@@ -767,6 +767,12 @@ remote_recv_cb(EV_P_ ev_io *w, int revents)
     char *addr_header   = remote_ctx->addr_header;
     int addr_header_len = remote_ctx->addr_header_len;
 
+    char addr_header_buf[512];
+    if (remote_ctx->af == AF_INET || remote_ctx->af == AF_INET6) {
+        addr_header_len = construct_udprelay_header(&src_addr, addr_header_buf);
+        addr_header     = addr_header_buf;
+    }
+
     // Construct packet
     brealloc(buf, buf->len + addr_header_len, buf_size);
     memmove(buf->data + addr_header_len, buf->data, buf->len);