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<BODY lang=EN-GB vLink=purple link=blue bgColor=#ffffff>
<DIV><FONT size=2>Which capture filter do you use? Also, do you capture any
packet if you set promiscuous mode on (setting the promiscuous parameter of
pcap_open_live to 1)?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Have a nice day</FONT></DIV>
<DIV><FONT size=2>GV</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=ryan.fowler@thomsonreuters.com
href="mailto:ryan.fowler@thomsonreuters.com">Ryan Fowler</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=winpcap-users@winpcap.org
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, July 01, 2008 6:47
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Winpcap-users] pcap_next_ex()
not receiving packets</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt">Hi,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US style="FONT-SIZE: 11pt">I am trying to
receive packets using pcap_next_ex(), but for some reason I keep getting a
timeout. I know that packets are coming into the machine because I can
see them via WinDump. The odd part is that when I run WinDump
concurrently with my test application, I start to see packets in the test app
(as well as in WinDump). But without WinDump, I get no packets on the
test app at all.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US style="FONT-SIZE: 11pt">I am guessing that
there is something I need to do to “start” the packet driver capturing,
although I thought that’s what pcap_open_live does, so I’m not quite sure on
that.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US style="FONT-SIZE: 11pt">My code so far is
a fairly liberal sampling of the pktdump_ex example:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: green">/* Open the adapter */<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: blue">if</SPAN> ((m_pSessionHandle =
pcap_open_live(m_pReceiveDevice->name, <SPAN
style="COLOR: green">// name of the device<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
65536, <SPAN style="COLOR: green">// 65536 means
the whole packet will be captured.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
0, <SPAN style="COLOR: green">// non promiscuous mode
(nonzero means promiscuous)<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
1000,
<SPAN style="COLOR: green">// read
timeout<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
errbuf <SPAN style="COLOR: green">// error
buffer</SPAN>)) == NULL)<SPAN
style="COLOR: green"><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
{<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
// Error code<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
}<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
std::cout << <SPAN style="COLOR: #a31515">"Filter: "</SPAN> <<
m_strFilter << std::endl;<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: blue">if</SPAN> ( !m_strFilter.empty()
)<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
{<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
bpf_u_int32 NetMask = 0;<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: blue">struct</SPAN> bpf_program
fcode;<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: green">//compile the filter<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: blue">if</SPAN>(pcap_compile(m_pSessionHandle, &fcode,
<SPAN style="COLOR: blue">const_cast</SPAN><<SPAN
style="COLOR: blue">char</SPAN>*>(m_strFilter.c_str()), 1, NetMask) <
0)<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
{<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
// Error code<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
}<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: green">//set the
filter<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: blue">if</SPAN>(pcap_setfilter(m_pSessionHandle,
&fcode)<0)<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
{<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
// Error code<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
}<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
}<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: green">/* At this point, we don't need the device list any
more. Free it */<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
pcap_freealldevs(alldevs);<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US style="FONT-SIZE: 11pt">And later
on:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: blue">while</SPAN>((res = pcap_next_ex( m_pSessionHandle,
&header, &pkt_data)) >= 0)<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
{<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: blue">if</SPAN>(res == 0)<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
{<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: green">/* Timeout elapsed */<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
OutputDebugString(L<SPAN style="COLOR: #a31515">"No
packets!\n"</SPAN>);<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
<SPAN style="COLOR: blue">continue</SPAN>;<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
}<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">//…<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">
}<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: silver 1pt dotted; PADDING-LEFT: 0cm; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; PADDING-TOP: 4pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 9pt; COLOR: #666666; FONT-FAMILY: 'Arial','sans-serif'">Ryan
Fowler</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: #666666; FONT-FAMILY: 'Arial','sans-serif'"><BR></SPAN><SPAN
style="FONT-SIZE: 9pt; COLOR: #666666; FONT-FAMILY: 'Arial','sans-serif'">Software
Engineer</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN-BOTTOM: 9pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; mso-margin-top-alt: 9.0pt"><B><SPAN
style="FONT-SIZE: 9pt; COLOR: #f57f20; FONT-FAMILY: 'Arial','sans-serif'">Thomson
Reuters</SPAN></B><SPAN style="FONT-FAMILY: 'Times New Roman','serif'">
<o:p></o:p></SPAN></P></DIV></DIV></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>Winpcap-users
mailing
list<BR>Winpcap-users@winpcap.org<BR>https://www.winpcap.org/mailman/listinfo/winpcap-users<BR></BLOCKQUOTE></BODY></HTML>