diff --git a/main.cpp b/main.cpp
index 796bdfd..3da57ea 100644
--- a/main.cpp
+++ b/main.cpp
@@ -151,22 +151,18 @@ int main(int argc,const char* argv[])
         {"--debug",VM_DEBUG},{"-dbg",VM_DEBUG}
     };
     uint32_t cmd=0;
-    bool recog_file=false;
     std::string filename;
     std::vector<std::string> vm_argv;
     for(int i=1;i<argc;++i)
     {
         if(cmdlst.count(argv[i]))
             cmd|=cmdlst[argv[i]];
-        else if(!recog_file)
-        {
+        else if(!filename.length())
             filename=argv[i];
-            recog_file=true;
-        }
         else
             vm_argv.push_back(argv[i]);
     }
-    if(!recog_file)
+    if(!filename.length())
         err();
     if(!cmd)
         cmd|=VM_EXEC;
diff --git a/module/libsock.nas b/module/libsock.nas
new file mode 100644
index 0000000..573f30f
--- /dev/null
+++ b/module/libsock.nas
@@ -0,0 +1,37 @@
+var socket=func(){
+    var lib=dylib.dlopen("./module/libnasock"~(os.platform()=="windows"?".dll":".so"));
+    var sock=dylib.dlsym(lib,"nas_socket");
+    var closesocket=dylib.dlsym(lib,"nas_closesocket");
+    var call=dylib.dlcall;
+    return {
+        AF_UNSPEC:0,AF_UNIX:1,AF_INET:2,AF_IMPLINK:3,
+        AF_PUP:4,AF_CHAOS:5,AF_IPX:6,AF_NS:6,
+        AF_ISO:7,AF_OSI:7,AF_ECMA:8,AF_DATAKIT:9,
+        AF_CCITT:10,AF_SNA:11,AF_DECnet:12,AF_DLI:13,
+        AF_LAT:14,AF_HYLINK:15,AF_APPLETALK:16,AF_NETBIOS:17,
+        AF_VOICEVIEW:18,AF_FIREFOX:19,AF_UNKNOWN1:20,AF_BAN:21,
+        AF_MAX:22,
+
+        SOCK_STREAM:1,SOCK_DGRAM:2,SOCK_RAW:3,SOCK_RDM:4,
+        SOCK_SEQPACKET:5,
+
+        IPPROTO_IP:0,IPPROTO_ICMP:1,IPPROTO_IGMP:2,IPPROTO_GGP:3,
+        IPPROTO_TCP:6,IPPROTO_PUP:12,IPPROTO_UDP:17,IPPROTO_IDP:22,
+        IPPROTO_ND:77,IPPROTO_RAW:255,IPPROTO_MAX:256,
+
+        IPPORT_ECHO:7,IPPORT_DISCARD:9,IPPORT_SYSTAT:11,IPPORT_DAYTIME:13,
+        IPPORT_NETSTAT:15,IPPORT_FTP:21,IPPORT_TELNET:23,IPPORT_SMTP:25,
+        IPPORT_TIMESERVER:37,IPPORT_NAMESERVER:42,IPPORT_WHOIS:43,IPPORT_MTP:57,
+        IPPORT_TFTP:69,IPPORT_RJE:77,IPPORT_FINGER:79,IPPORT_TTYLINK:87,
+        IPPORT_SUPDUP:95,IPPORT_EXECSERVER:512,IPPORT_LOGINSERVER:513,IPPORT_CMDSERVER:514,
+        IPPORT_EFSSERVER:520,IPPORT_BIFFUDP:512,IPPORT_WHOSERVER:513,IPPORT_ROUTESERVER:520,
+        IPPORT_RESERVED:1024,
+
+        socket:func(af,type,proto){
+            return call(sock,af,type,proto);
+        },
+        closesocket:func(sd){
+            return call(closesocket,sd);
+        }
+    };
+}();
\ No newline at end of file
diff --git a/module/makefile b/module/makefile
index a61f2de..88a6474 100644
--- a/module/makefile
+++ b/module/makefile
@@ -15,6 +15,14 @@ libkey.dll: keyboard.cpp
 	g++ -c -O3 keyboard.cpp -fPIC -o keyboard.o -static
 	g++ -shared -o libkey.dll keyboard.o -static
 
+libnasock.so: nasocket.cpp
+	clang++ -c -O3 nasocket.cpp -fPIC -o nasocket.o
+	clang++ -shared -o libnasock.so nasocket.o
+	rm nasocket.o
+libnasock.dll: nasocket.cpp
+	g++ -c -O3 nasocket.cpp -fPIC -o nasocket.o -lwsock32 -static
+	g++ -shared -o libnasock.dll nasocket.o -lwsock32 -static
+
 clean:
 	rm *.o *.so *.dll *.dylib
 all: libfib.so libkey.so
diff --git a/module/nasocket.cpp b/module/nasocket.cpp
new file mode 100644
index 0000000..f69a984
--- /dev/null
+++ b/module/nasocket.cpp
@@ -0,0 +1,43 @@
+#include "../nasal.h"
+
+#ifdef _WIN32
+#include <winsock.h>
+#pragma comment(lib,"ws2_32")
+
+class WSAmanager{
+private:
+    WSAData data;
+public:
+    WSAmanager(){
+        WSAStartup(0x1010,&data);
+    }
+    ~WSAmanager(){
+        WSACleanup();
+    }
+};
+
+static WSAmanager win;
+#else
+#include <sys/socket.h>
+#endif
+
+extern "C" nasal_ref nas_socket(std::vector<nasal_ref>& args,nasal_gc& gc){
+    if(args.size()!=3)
+        return builtin_err("socket","invalid arguments");
+    if(args[0].type!=vm_num || args[1].type!=vm_num || args[2].type!=vm_num)
+        return builtin_err("socket","\"af\", \"type\", \"protocol\" should be number");
+    int sd=socket(args[0].num(),args[1].num(),args[2].num());
+    return {vm_num,(double)sd};
+}
+
+extern "C" nasal_ref nas_closesocket(std::vector<nasal_ref>& args,nasal_gc& gc){
+    if(args.size()!=1)
+        return builtin_err("closesocket","invalid arguments");
+    if(args[0].type!=vm_num)
+        return builtin_err("closesocket","\"\" should be number");
+#ifdef _WIN32
+    return {vm_num,(double)closesocket(args[0].num())};
+#else
+    return {vm_num,(double)close(args[0].num())};
+#endif
+}
\ No newline at end of file