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MAC address (among other things) and ostensibly contain that address within them. I say ostensibly because that
is not at all certain. I provide this method mostly as an example of what <i>not</i> to do. You may end up with
you MAC address this way, but chances are you'll just end up with some random hex values.
</p>
<p>
This is pretty simple and doesn't require much explanation. We create a GUID with CoCreateGuid and dump the last six
bytes into a string. These <i>should</i> be the MAC address, but as I said, there's no way to be certain.
</p>
<p>
<table width=100% cellpadding=3 cellspacing=0 border=1>
<tr><td bgcolor=blue><font color=white><a name="code2">uuid.cpp</a></font></td></tr>
<tr><td>
<pre>
<font color="202020">#include <windows.h></font>
<font color="202020">#include <iostream></font>
<font color="202020">#include <conio.h></font>
<b>using</b> <b>namespace</b> std;
<b>int</b> main()
{
cout << <font color="#0000FF">"MAC address is: "</font>;
<font color="#0000AA"><i>// Ask COM to create a UUID for us. If this machine has an Ethernet</i></font>
<font color="#0000AA"><i>// adapter, the last six bytes of the UUID (bytes 2-7 inclusive in</i></font>
<font color="#0000AA"><i>// the Data4 element) should be the MAC address of the local</i></font>
<font color="#0000AA"><i>// Ethernet adapter.</i></font>
GUID uuid;
CoCreateGuid(&uuid);
<font color="#0000AA"><i>// Spit the address out</i></font>
<b>char</b> mac_addr[18];
sprintf(mac_addr,<font color="#0000FF">"%02X:%02X:%02X:%02X:%02X:%02X"</font>,
uuid.Data4[2],uuid.Data4[3],uuid.Data4[4],
uuid.Data4[5],uuid.Data4[6],uuid.Data4[7]);
cout << mac_addr << endl;
getch();
<b>return</b> 0;
}
</pre>
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</table>
</td></tr>
<tr><td align = left bgcolor=black>
<a name="method3"></a><A class=loginLink href="#top"><font color=white face="Arial" size=+1>Method 3 - Using the SNMP Extension API</font></a>
<font color=white face="Arial" size=+1>[<a href="#code3" class=loginLink onMouseover="window.status='snmp.cpp';return true" onMouseout="window.status='';return true">code</a>]</font>
</td></tr>
<tr><td>
<p>
<big>T</big>he third method I will talk about is using the SNMP (Simple Network Management Protocol) extension in
Windows to get your system's address. The protocol in my experience is anything but simple, but the code should
read pretty straight-forwardly. Basically the steps are the same as with Netbios:
<ul>
<li>Get a list of adapters</li>
<li>Query each adapter for type and MAC address</li>
<li>Save the adapters that are actual NICs</li>
</ul>
I don't personally know much about SNMP, but as I said before, the code is pretty clear. For more information, refer
to the following URLs:<br><br>
<a href="http://msdn.microsoft.com/library/default.asp?URL=/library/psdk/network/snmp_156b.htm">SNMP Functions</a><br>
<a href="http://msdn.microsoft.com/library/default.asp?URL=/library/psdk/network/snmp_1p6b.htm">SNMP Variable Types and Request PDU Types</a><br>
<a href="http://msdn.microsoft.com/library/default.asp?URL=/library/psdk/network/snmp_0xtf.htm">SNMP Structures</a>
<p>
<table width=100% cellpadding=3 cellspacing=0 border=1>
<tr><td bgcolor=blue><font color=white><a name="code3">snmp.cpp</a></font></td></tr>
<tr><td>
<pre>
<font color="202020">#include <snmp.h></font>
<font color="202020">#include <conio.h></font>
<font color="202020">#include <stdio.h></font>
<b>typedef</b> <b>bool</b>(WINAPI * pSnmpExtensionInit) (
IN DWORD dwTimeZeroReference,
OUT HANDLE * hPollForTrapEvent,
OUT AsnObjectIdentifier * supportedView);
<b>typedef</b> <b>bool</b>(WINAPI * pSnmpExtensionTrap) (
OUT AsnObjectIdentifier * enterprise,
OUT AsnInteger * genericTrap,
OUT AsnInteger * specificTrap,
OUT AsnTimeticks * timeStamp,
OUT RFC1157VarBindList * variableBindings);
<b>typedef</b> <b>bool</b>(WINAPI * pSnmpExtensionQuery) (
IN BYTE requestType,
IN OUT RFC1157VarBindList * variableBindings,
OUT AsnInteger * errorStatus,
OUT AsnInteger * errorIndex);
<b>typedef</b> <b>bool</b>(WINAPI * pSnmpExtensionInitEx) (
OUT AsnObjectIdentifier * supportedView);
<b>void</b> main()
{
HINSTANCE m_hInst;
pSnmpExtensionInit m_Init;
pSnmpExtensionInitEx m_InitEx;
pSnmpExtensionQuery m_Query;
pSnmpExtensionTrap m_Trap;
HANDLE PollForTrapEvent;
AsnObjectIdentifier SupportedView;
UINT OID_ifEntryType[] = {1, 3, 6, 1, 2, 1, 2, 2, 1, 3};
UINT OID_ifEntryNum[] = {1, 3, 6, 1, 2, 1, 2, 1};
UINT OID_ipMACEntAddr[] = {1, 3, 6, 1, 2, 1, 2, 2, 1, 6};
AsnObjectIdentifier MIB_ifMACEntAddr =
{ <b>sizeof</b>(OID_ipMACEntAddr) <b>sizeof</b>(UINT), OID_ipMACEntAddr };
AsnObjectIdentifier MIB_ifEntryType =
{<b>sizeof</b>(OID_ifEntryType) <b>sizeof</b>(UINT), OID_ifEntryType};
AsnObjectIdentifier MIB_ifEntryNum =
{<b>sizeof</b>(OID_ifEntryNum) <b>sizeof</b>(UINT), OID_ifEntryNum};
RFC1157VarBindList varBindList;
RFC1157VarBind varBind[2];
AsnInteger errorStatus;
AsnInteger errorIndex;
AsnObjectIdentifier MIB_NULL = {0, 0};
<b>int</b> ret;
<b>int</b> dtmp;
<b>int</b> i = 0, j = 0;
<b>bool</b> found = <b>false</b>;
<b>char</b> TempEthernet[13];
m_Init = NULL;
m_InitEx = NULL;
m_Query = NULL;
m_Trap = NULL;
<font color="#0000AA"><i>/* Load the SNMP dll and get the addresses of the functions
necessary */</i></font>
m_hInst = LoadLibrary(<font color="#0000FF">"inetmib1.dll"</font>);
<b>if</b> (m_hInst < (HINSTANCE) HINSTANCE_ERROR)
{
m_hInst = NULL;
<b>return</b>;
}
m_Init =
(pSnmpExtensionInit) GetProcAddress(m_hInst, <font color="#0000FF">"SnmpExtensionInit"</font>);
m_InitEx =
(pSnmpExtensionInitEx) GetProcAddress(m_hInst,
<font color="#0000FF">"SnmpExtensionInitEx"</font>);
m_Query =
(pSnmpExtensionQuery) GetProcAddress(m_hInst,
<font color="#0000FF">"SnmpExtensionQuery"</font>);
m_Trap =
(pSnmpExtensionTrap) GetProcAddress(m_hInst, <font color="#0000FF">"SnmpExtensionTrap"</font>);
m_Init(GetTickCount(), &PollForTrapEvent, &SupportedView);
<font color="#0000AA"><i>/* Initialize the variable list to be retrieved by m_Query */</i></font>
varBindList.list = varBind;
varBind[0].name = MIB_NULL;
varBind[1].name = MIB_NULL;
<font color="#0000AA"><i>/* Copy in the OID to find the number of entries in the
Inteface table */</i></font>
varBindList.len = 1; <font color="#0000AA"><i>/* Only retrieving one item */</i></font>
SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryNum);
ret =
m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
&errorIndex);
printf(<font color="#0000FF">"# of adapters in this system : %in"</font>,
varBind[0].value.asnValue.number);
varBindList.len = 2;
<font color="#0000AA"><i>/* Copy in the OID of ifType, the type of interface */</i></font>
SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryType);
<font color="#0000AA"><i>/* Copy in the OID of ifPhysAddress, the address */</i></font>
SNMP_oidcpy(&varBind[1].name, &MIB_ifMACEntAddr);
<b>do</b>
{
<font color="#0000AA"><i>/* Submit the query. Responses will be loaded into varBindList.
We can expect this call to succeed a # of times corresponding
to the # of adapters reported to be in the system */</i></font>
ret =
m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
&errorIndex);
<b>if</b> (!ret)
ret = 1;
<b>else</b>
<font color="#0000AA"><i>/* Confirm that the proper type has been returned */</i></font>
ret =
SNMP_oidncmp(&varBind[0].name, &MIB_ifEntryType,
MIB_ifEntryType.idLength); <b>if</b> (!ret) {
j++;
dtmp = varBind[0].value.asnValue.number;
printf(<font color="#0000FF">"Interface #%i type : %in"</font>, j, dtmp);
<font color="#0000AA"><i>/* Type 6 describes ethernet interfaces */</i></font>
<b>if</b> (dtmp == 6)
{
<font color="#0000AA"><i>/* Confirm that we have an address here */</i></font>
ret =
SNMP_oidncmp(&varBind[1].name, &MIB_ifMACEntAddr,
MIB_ifMACEntAddr.idLength);
<b>if</b> ((!ret) && (varBind[1].value.asnValue.address.stream != NULL))
{
<b>if</b>((varBind[1].value.asnValue.address.stream[0] == 0x44)
&& (varBind[1].value.asnValue.address.stream[1] == 0x45)
&& (varBind[1].value.asnValue.address.stream[2] == 0x53)
&& (varBind[1].value.asnValue.address.stream[3] == 0x54)
&& (varBind[1].value.asnValue.address.stream[4] == 0x00))
{
<font color="#0000AA"><i>/* Ignore all dial-up networking adapters */</i></font>
printf(<font color="#0000FF">"Interface #%i is a DUN adaptern"</font>, j);
<b>continue</b>;
}
<b>if</b> ((varBind[1].value.asnValue.address.stream[0] == 0x00)
&& (varBind[1].value.asnValue.address.stream[1] == 0x00)
&& (varBind[1].value.asnValue.address.stream[2] == 0x00)
&& (varBind[1].value.asnValue.address.stream[3] == 0x00)
&& (varBind[1].value.asnValue.address.stream[4] == 0x00)
&& (varBind[1].value.asnValue.address.stream[5] == 0x00))
{
<font color="#0000AA"><i>/* Ignore NULL addresses returned by other network
interfaces */</i></font>
printf(<font color="#0000FF">"Interface #%i is a NULL addressn"</font>, j);
<b>continue</b>;
}
sprintf(TempEthernet, <font color="#0000FF">"%02x%02x%02x%02x%02x%02x"</font>,
varBind[1].value.asnValue.address.stream[0],
varBind[1].value.asnValue.address.stream[1],
varBind[1].value.asnValue.address.stream[2],
varBind[1].value.asnValue.address.stream[3],
varBind[1].value.asnValue.address.stream[4],
varBind[1].value.asnValue.address.stream[5]);
printf(<font color="#0000FF">"MAC Address of interface #%i: %sn"</font>, j,
TempEthernet);}
}
}
} <b>while</b> (!ret); <font color="#0000AA"><i>/* Stop only on an error. An error will occur
when we go exhaust the list of interfaces to
be examined */</i></font>
getch();
FreeLibrary(m_hInst);
<font color="#0000AA"><i>/* Free the bindings */</i></font>
SNMP_FreeVarBind(&varBind[0]);
SNMP_FreeVarBind(&varBind[1]);
}
</pre>
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