C / C++ / MFC

14-Feb-07 23:14

I have a tbl for COM application.

In the header file of the application - initInstance(),
CoInitializeEx(NULL,COINIT_MULTITHREADED); is called.

In the Dialog (normal MFC) creatinstance is called.
The classID is passed to the createinstance.

Then,

BOOL Ret = AfxConnectionAdvise(
<punksrc>,
DIID__IEvents ,
GetIDispatch(FALSE), //get the IDispatch assocaiated with Mainframe...
FALSE, //donod addref
&m_dwCookie);//cookie to break connection later...
}

But, while calling the above method, exception is trown in AfxConnectionAdvise.

Thanks

Thanks
Raji

prasad_som15-Feb-07 0:55

15-Feb-07 0:55

RajiRaghu wrote:
GetIDispatch(FALSE), //get the IDispatch assocaiated with Mainframe...
FALSE, //donod addref
&m_dwCookie);//cookie to break connection later...
}

Are you sure GetIDDispatch here is retunring non-NULL ?

Prasad
Notifier using ATL | Operator new[],delete[][^]

RajiRaghu15-Feb-07 1:17

15-Feb-07 1:17

m_pControl.CreateInstance("8fea0f92-1975-4a13-af9b-5666583843db");
m_pMonitor.CreateInstance("b4c8b90e-11c8-4f8b-81a0-a6bcb53d5c2a");

The first parameter of AfxConnectionAdvise - pUnkSrc is 0x00000000
pUnkSink - is not null.
- pUnkSink 0x0012fe34 IUnknown *
- [COleDispatchImpl] {...} COleDispatchImpl
- IDispatch {...} IDispatch
- IUnknown {...} IUnknown
- __vfptr 0x7c15957c const COleDispatchImpl::`vftable' *
[0] 0x7c2e5f80 COleDispatchImpl::QueryInterface(const _GUID &, void * *) *
[1] 0x7c2e5f40 COleDispatchImpl::AddRef(void) *
[2] 0x7c2e5f60 COleDispatchImpl::Release(void)

Thanks
Raji

prasad_som15-Feb-07 1:29

15-Feb-07 1:29

RajiRaghu wrote:
The first parameter of AfxConnectionAdvise - pUnkSrc is 0x00000000

That may be cause of exception.

Prasad
Notifier using ATL | Operator new[],delete[][^]

RajiRaghu15-Feb-07 1:31

15-Feb-07 1:31

The first parameter is from
m_pControl.CreateInstance("8fea0f92-1975-4a13-af9b-5666583843db");
m_pMonitor.CreateInstance("b4c8b90e-11c8-4f8b-81a0-a6bcb53d5c2a");

means that createInstance failed?

Please suggest altenatives..

Thanks
Raji

prasad_som15-Feb-07 1:46

15-Feb-07 1:46

May be seeing complete relevent code can thorugh some light.

Prasad
Notifier using ATL | Operator new[],delete[][^]

RajiRaghu15-Feb-07 18:36

15-Feb-07 18:36

improrted the tlb file with the path. .tlh got created.

but in createinstance, HRESULT returns "Invalid Class String" is returned.

Is anything need to be registered? Is this is the problem with the application unaware of the tlb file?

Any clues please.

Thanks
Raji

prasad_som15-Feb-07 18:45

15-Feb-07 18:45

RajiRaghu wrote:
but in createinstance, HRESULT returns "Invalid Class String" is returned

This resons may come because of following reaosns,
1. Either you have not registered your component using regsvr32.
2. You are using wrong class id to instanciate object.

Prasad
Notifier using ATL | Operator new[],delete[][^]

RajiRaghu15-Feb-07 19:00

15-Feb-07 19:00

Created an application where the .tbl file is included.

The corresponding .dll is in the library path.

Did not register any .dll.

Thanks
Raji

prasad_som15-Feb-07 19:03

broadcast with unbound adapter

15-Feb-07 19:03

From command line you need to use command regsvr32 "dllpath.dll", to register component. You will get registration succesful message box then.

Prasad
Notifier using ATL | Operator new[],delete[][^]

locquet14-Feb-07 23:13

14-Feb-07 23:13

Hi,

I am trying to broadcast a DHCP Message with unbound adapter (after ipconfig /release) on windows XP SP2.
When I try to send the message, I get the error 10065 (WSAEHOSTUNREACH).
I am trying to send the message using Microsoft Visual C++. I have tried using a RAW socket.
The Message is succesfully sent when an IP address is bound, but I receive 10065 when it is unbound (0.0.0.0).
I have also tried using a Java program, but I get the equivalent error: NoRouteToHostException.

I know it is possible to send such a message, since the Microsoft DHCP Client does it at "ipconfig /renew" after an "ipconfig /release".

Could anyone help me?

Mark Salsbery15-Feb-07 6:56

15-Feb-07 6:56

I'm confused. How can there be a "route to host" if your sending socket isn't bound?

Great job, team. Head back to base for debriefing and cocktails.

locquet15-Feb-07 21:12

15-Feb-07 21:12

Thanks for your answer.

I don't know how there can be a route to host!
The destination of the message is not a specific host, it is broadcasted to 255.255.255.255.

But I know that this is possible. I you unbind your adapter with "ipconfig /release", then if you run "ipconfig /renew", a DHCP Message is broadcasted from 0.0.0.0 to 255.255.255.255.

It is possible but I do not know how to configure my socket to do this.

Mark Salsbery16-Feb-07 6:40

16-Feb-07 6:40

You still need to bind the socket.
Maybe create the broadcast socket something like (note I've omitted error handling):

sockaddr_in bindsocketaddr;
memset(&bindsocketaddr, 0, sizeof(bindsocketaddr));
bindsocketaddr.sin_family = AF_INET;
bindsocketaddr.sin_port = htons(portnumber);
bindsocketaddr.sin_addr.s_addr = INADDR_ANY;
 
SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 
BOOL fBroadcast = 1;
setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&fBroadcast, sizeof(BOOL));
 
bind(sock, (sockaddr *)&bindsocketaddr, sizeof(bindsocketaddr));

Then using the broadcast socket, use sendto() to broadcast a DHCP message - the destination
address could be set up something like:

// Broadcast address for a DHCP server
 
#define DHCP_SERVER_PORT 67
 
sockaddr_in destsocketaddr;
memset(&destsocketaddr, 0, sizeof(destsocketaddr));
destsocketaddr.sin_family = AF_INET;
destsocketaddr.sin_port = htons(DHCP_SERVER_PORT);
destsocketaddr.sin_addr.s_addr = INADDR_BROADCAST;

Hopefully that helps a bit Smile | :)

Mark

Great job, team. Head back to base for debriefing and cocktails.

locquet21-Feb-07 5:10

21-Feb-07 5:10

Hi Mark,

thanks for the advice.

The code I was using was very close from this one.
I have tried with your code and I still get the 10065 "no route to host".

Mark Salsbery21-Feb-07 7:06

Re: broadcast with unbound adapter [modified]

21-Feb-07 7:06

Have you checked for errors on all socket operations?
Is the port number you are broadcasting to valid?

Mark

"Do you know what it's like to fall in the mud and get kicked... in the head... with an iron boot?
Of course you don't, no one does. It never happens. It's a dumb question... skip it."

Mark Salsbery21-Feb-07 7:18

21-Feb-07 7:18

I just tested the following code exactly as shown and it worked for me.
Anything you are doing differently?

sockaddr_in bindsocketaddr;
memset(&bindsocketaddr, 0, sizeof(bindsocketaddr));
bindsocketaddr.sin_family = AF_INET;
bindsocketaddr.sin_port = htons(2700);
bindsocketaddr.sin_addr.s_addr = INADDR_ANY;
 
SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 
BOOL fBroadcast = 1;
setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&fBroadcast, sizeof(BOOL));
 
bind(sock, (sockaddr *)&bindsocketaddr, sizeof(bindsocketaddr));
 
#define DHCP_SERVER_PORT 67
 
sockaddr_in destsocketaddr;
memset(&destsocketaddr, 0, sizeof(destsocketaddr));
destsocketaddr.sin_family = AF_INET;
destsocketaddr.sin_port = htons(DHCP_SERVER_PORT);
destsocketaddr.sin_addr.s_addr = INADDR_BROADCAST;
 
// broadcast 5 meaningless bytes to any listening DHCP server 
sendto(sock, "12345", 5, 0, (const struct sockaddr*)&destsocketaddr, sizeof(destsocketaddr));
 
closesocket(sock);

-- modified at 13:23 Wednesday 21st February, 2007
*EDIT* added comment to code for sendto()

"Do you know what it's like to fall in the mud and get kicked... in the head... with an iron boot?
Of course you don't, no one does. It never happens. It's a dumb question... skip it."

Mark Salsbery21-Feb-07 7:22

21-Feb-07 7:22

One other thought - you have to use sendto() unless you call connect() on your socket.
Calling send() will fail because there's no destination address specified (not even the broadcast
address).

Mark

"Do you know what it's like to fall in the mud and get kicked... in the head... with an iron boot?
Of course you don't, no one does. It never happens. It's a dumb question... skip it."

locquet23-Feb-07 4:36

23-Feb-07 4:36

Hello Mark,

I'm confused... I must be missing something!

Here is my code (same as yours with error handling). I compile using visual C++ 6.0. I have tested it on Windows XP Service Pack 1 and 2.
If I execute ipconfig /release, and then the following code, I get the "Error sending Packet : 10065" displayed.
Can you please e-mail me your code?

Thank you very much for your help.

#include "stdio.h"
#include "winsock2.h"

int main()
{

//Initialise Winsock
WSADATA wsock;
printf("\nInitialising Winsock...\n");
if (WSAStartup(MAKEWORD(2,2),&wsock) != 0){
fprintf(stderr,"WSAStartup() failed");
exit(EXIT_FAILURE);
}
printf("Initialised successfully.\n");

sockaddr_in bindsocketaddr;
memset(&bindsocketaddr, 0, sizeof(bindsocketaddr));
bindsocketaddr.sin_family = AF_INET;
bindsocketaddr.sin_port = htons(2700);
bindsocketaddr.sin_addr.s_addr = INADDR_ANY;

SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sock==SOCKET_ERROR){
printf("Creation of socket failed.");
return 0;
}

BOOL fBroadcast = 1;
int iResult = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&fBroadcast, sizeof(BOOL));
if (iResult == SOCKET_ERROR){
printf("Error setsockopt : %d\n",WSAGetLastError());
}

iResult =bind(sock, (sockaddr *)&bindsocketaddr, sizeof(bindsocketaddr));
if (iResult == SOCKET_ERROR ){
printf("Unable to bind.");
return 0;
}

#define DHCP_SERVER_PORT 67

sockaddr_in destsocketaddr;
memset(&destsocketaddr, 0, sizeof(destsocketaddr));
destsocketaddr.sin_family = AF_INET;
destsocketaddr.sin_port = htons(DHCP_SERVER_PORT);
destsocketaddr.sin_addr.s_addr = INADDR_BROADCAST;

// broadcast 5 meaningless bytes to any listening DHCP server
iResult = sendto(sock, "12345", 5, 0, (const struct sockaddr*)&destsocketaddr, sizeof(destsocketaddr));
if (iResult == SOCKET_ERROR){
printf("Error sending Packet : %d\n",WSAGetLastError());
}

closesocket(sock);

return 0;
}

Mark Salsbery23-Feb-07 7:20

23-Feb-07 7:20

locquet wrote:
If I execute ipconfig /release, and then the following code, I get the "Error sending Packet : 10065" displayed.

Ohhh - yeah that won't work. If you release the ip for the adapter then, well you'll get the
error you are seeing.

I'm going to take a look at that code again - I'll be back.

Mark

"Do you know what it's like to fall in the mud and get kicked... in the head... with an iron boot?
Of course you don't, no one does. It never happens. It's a dumb question... skip it."

Mark Salsbery23-Feb-07 7:59

23-Feb-07 7:59

It was me that was confused Smile | :)

If I had read your original post carefully I would have noticed
the "after ipconfig /release" part. Sorry.

What did you try with raw sockets? Can you post sample code?

Also, are you required to do the DHCP communication yourself? If not, then maybe the IPHelper
APIs can help. Check out IPReleaseAddress()/IPRenewAddress().

Mark

"Do you know what it's like to fall in the mud and get kicked... in the head... with an iron boot?
Of course you don't, no one does. It never happens. It's a dumb question... skip it."

locquet27-Feb-07 0:51

27-Feb-07 0:51

Unfortunately, I have to write the DHCP communication myself. I have to set configurable DHCP Options, and to choose how to treat DHCP ACK and OFFER Messages. According to my understanding of the IPHelper api, it is not possible.

Here is an extract of my code using a raw socket, but I do not think that the solution consists in using raw sockets.

Tell me if you want me to email you the whole project.

char host[100],buf[1000],*data=NULL,source_ip[20]; //buf is the complete packet<br />
	SOCKET s;<br />
	int k=1;<br />
	<br />
	struct pseudo_entete pseudo_udp;<br />
	<br />
	IPV4_HDR *v4hdr=NULL;<br />
	UDP_HDR *udphdr=NULL;<br />
	<br />
	DhcpMessage * pdmDiscover = new DhcpMessage(); //DhcpMessage Class declared in another file<br />
	<br />
	int payload=DHCP_MESSAGE_SIZE , optval;<br />
	SOCKADDR_IN dest;<br />
	hostent *server;<br />
	<br />
	//Initialise Winsock<br />
	WSADATA wsock;<br />
	printf("\nInitialising Winsock...");<br />
	if (WSAStartup(MAKEWORD(2,2),&wsock) != 0)<br />
	{<br />
		fprintf(stderr,"WSAStartup() failed");<br />
        exit(EXIT_FAILURE); <br />
	} <br />
	printf("Initialised successfully.");<br />
	<br />
	printf("\nCreating Raw Socket...");<br />
	if((s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW))==SOCKET_ERROR)<br />
	{<br />
		printf("Creation of raw socket failed.");<br />
		return 0;<br />
	}<br />
	printf("Raw TCP Socket Created successfully.");<br />
	<br />
	<br />
	BOOL OptValue = 1 ;<br />
	if (setsockopt( s, SOL_SOCKET, SO_BROADCAST, (char *)&OptValue, sizeof(BOOL))==SOCKET_ERROR) {<br />
		printf("failed to set socket in broadcast mode.");<br />
		return 0;<br />
	}<br />
	printf("Set socket in broadcast mode successful.");<br />
	<br />
	host[0] = 0;<br />
	strcpy(host, "255.255.255.255");<br />
	printf("\nResolving Hostname...");<br />
	if((server=gethostbyname(host))==0)<br />
	{<br />
		printf("Unable to resolve.");<br />
		return 0;<br />
	}<br />
	dest.sin_family = AF_INET;<br />
	dest.sin_port   = htons(67);  //your destination port<br />
	memcpy(&dest.sin_addr.s_addr,server->h_addr,server->h_length);<br />
	printf("Resolved.");<br />
<br />
	source_ip[0] = 0;<br />
	strcpy(source_ip, "0.0.0.0");<br />
	<br />
	v4hdr = (IPV4_HDR *)buf;  //lets point to the ip header portion<br />
	v4hdr->ip_version=4;<br />
	v4hdr->ip_header_len=5;<br />
	v4hdr->ip_tos    = 0;<br />
	v4hdr->ip_total_length = htons ( sizeof(IPV4_HDR) + sizeof(UDP_HDR) + payload );<br />
	v4hdr->ip_id     = htons(2);<br />
	v4hdr->ip_frag_offset = 0;<br />
	v4hdr->ip_frag_offset1 = 0;<br />
	v4hdr->ip_reserved_zero = 0;<br />
	v4hdr->ip_dont_fragment = 0;//1;<br />
	v4hdr->ip_more_fragment = 0;<br />
	v4hdr->ip_ttl    = 8;<br />
	v4hdr->ip_protocol = IPPROTO_UDP;<br />
	v4hdr->ip_srcaddr  = inet_addr(source_ip);<br />
	v4hdr->ip_destaddr = inet_addr(inet_ntoa(dest.sin_addr));<br />
	v4hdr->ip_checksum = 0;<br />
	<br />
	udphdr = (UDP_HDR *)&buf[sizeof(IPV4_HDR)];<br />
	<br />
	udphdr->sport = htons(68);<br />
	udphdr->dport = htons(67);<br />
	udphdr->Length = htons(8 + payload);<br />
	udphdr->Checksum = 0;<br />
<br />
	data = &buf[sizeof(IPV4_HDR) + sizeof(UDP_HDR)];<br />
	memcpy(data, pdmDiscover->m_rgwbMessage [0].buf, payload);<br />
	<br />
	v4hdr->ip_checksum = checksum((unsigned short *)&v4hdr, sizeof(ip_hdr));<br />
	<br />
	<br />
	pseudo_udp.ip_source=inet_addr(source_ip);<br />
    pseudo_udp.ip_destination=inet_addr(inet_ntoa(dest.sin_addr));<br />
    pseudo_udp.mbz=0;<br />
    pseudo_udp.type=IPPROTO_UDP;<br />
    pseudo_udp.length=htons((unsigned short)(sizeof(udp_hdr)+(unsigned short)payload));<br />
	<br />
	char tampon[65535];<br />
	<br />
	memcpy(tampon,&pseudo_udp,sizeof(pseudo_udp));<br />
    memcpy(tampon+sizeof(pseudo_udp),&udphdr,sizeof(udphdr));<br />
    memcpy(tampon+sizeof(pseudo_udp)+sizeof(udphdr),data,payload);<br />
    int checksum1=checksum((unsigned short*)tampon,sizeof(pseudo_udp)+sizeof(udphdr)+payload);<br />
	udphdr->Checksum = 0x3b92;<br />
<br />
	printf("\nSending packet...\n");<br />
	<br />
	sockaddr_in  saddr ;<br />
	saddr.sin_family = AF_INET ;<br />
    saddr.sin_port = htons(68) ; <br />
    saddr.sin_addr.S_un.S_addr = INADDR_ANY ;<br />
	<br />
    int iRet = bind(s, (LPSOCKADDR) & saddr, sizeof saddr) ;<br />
    if (iRet == SOCKET_ERROR ){<br />
		printf("Unable to bind.");<br />
		return 0;<br />
	}<br />
	<br />
	<br />
	iRet = sendto(s , buf , sizeof(IPV4_HDR)+sizeof(UDP_HDR) + payload, 0,<br />
			(SOCKADDR *)&dest, sizeof(dest)))==SOCKET_ERROR);<br />
if (iRet == SOCKET_ERROR ){<br />
			<br />
			printf("Error sending Packet : %d\n",WSAGetLastError());<br />
			break;<br />
		}<br />
	<br />

locquet14-Mar-07 0:38