Check if WinPcap initialised correctly

Don't start the RX thread if it hasn't.

Also additional null checks to prevent crashes.

plugins/dev9ghzdrk/Win32/Win32.cpp

@@ -175,16 +175,25 @@ UINT DEV9ThreadProc() {
 }*/
 NetAdapter* GetNetAdapter()
 {
+	NetAdapter* na;
 	if(config.Eth[0]=='p')
 	{
-		return new PCAPAdapter();
+		na = new PCAPAdapter();
 	}
 	else if (config.Eth[0]=='t')
 	{
-		return new TAPAdapter();
+		na = new TAPAdapter();
 	}
 	else
 		return 0;
+
+
+	if (!na->isInitialised())
+	{
+		delete na;
+		return 0;
+	}
+	return na;
 }
 s32  _DEV9open() 
 {

plugins/dev9ghzdrk/Win32/net.cpp

@@ -42,7 +42,8 @@ DWORD WINAPI NetRxThread(LPVOID lpThreadParameter)
 
 void tx_put(NetPacket* pkt)
 {
-	nif->send(pkt);
+	if (nif!=NULL)
+		nif->send(pkt);
 	//pkt must be copied if its not processed by here, since it can be allocated on the callers stack
 }
 void InitNet(NetAdapter* ad)
@@ -65,5 +66,6 @@ void TermNet()
 		emu_printf(".done\n");
 
 		delete nif;
+		nif = NULL;
 	}
 }

plugins/dev9ghzdrk/Win32/net.h

@@ -34,6 +34,7 @@ class NetAdapter
 {
 public:
 	virtual bool blocks()=0;
+	virtual bool isInitialised() = 0;
 	virtual bool recv(NetPacket* pkt)=0;	//gets a packet
 	virtual bool send(NetPacket* pkt)=0;	//sends the packet and deletes it when done
 	virtual ~NetAdapter(){}

plugins/dev9ghzdrk/Win32/pcap_io.h

@@ -168,6 +168,7 @@ class PCAPAdapter : public NetAdapter
 public:
 	PCAPAdapter();
 	virtual bool blocks();
+	virtual bool isInitialised();
 	//gets a packet.rv :true success
 	virtual bool recv(NetPacket* pkt);
 	//sends the packet and deletes it when done (if successful).rv :true success

plugins/dev9ghzdrk/Win32/tap-win32.cpp

@@ -381,6 +381,10 @@ bool TAPAdapter::blocks()
 {
 	return true;	//we use blocking io
 }
+bool TAPAdapter::isInitialised()
+{
+	return (htap != NULL);
+}
 u8 broadcast_adddrrrr[6]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
 //gets a packet.rv :true success
 bool TAPAdapter::recv(NetPacket* pkt)

plugins/dev9ghzdrk/Win32/tap.h

@@ -31,6 +31,7 @@ class TAPAdapter : public NetAdapter
 public:
 	TAPAdapter();
 	virtual bool blocks();
+	virtual bool isInitialised();
 	//gets a packet.rv :true success
 	virtual bool recv(NetPacket* pkt);
 	//sends the packet and deletes it when done (if successful).rv :true success

plugins/dev9ghzdrk/pcap_io.cpp

@@ -117,10 +117,13 @@ int pcap_io_init(char *adapter)
 							 errbuf			// error buffer
 							 )) == NULL)
 	{
+		fprintf(stderr, errbuf);
 		fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", adapter);
 		return -1;
 	}
 
+	
+
 	dlt = pcap_datalink(adhandle);
 	dlt_name = (char*)pcap_datalink_val_to_name(dlt);
 
@@ -326,7 +329,8 @@ void pcap_io_close()
 		fclose(packet_log);
 	if(dump_pcap)
 		pcap_dump_close(dump_pcap);
-	pcap_close(adhandle);  
+	if (adhandle)
+		pcap_close(adhandle);  
 	pcap_io_running=0;
 }
 
@@ -429,6 +433,10 @@ bool PCAPAdapter::blocks()
 {
 	return false;
 }
+bool PCAPAdapter::isInitialised()
+{
+	return pcap_io_running;
+}
 //gets a packet.rv :true success
 bool PCAPAdapter::recv(NetPacket* pkt)
 {