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Allow offline packet sources to register FDs.

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This commit is contained in:
Jan Grashoefer 2023-03-03 19:40:38 +01:00 • committed by Arne Welzel
parent 39c3bb797c
commit 26d3a81c09
2 changed files with 9 additions and 14 deletions
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8
src/iosource/PktSrc.cc
View file

@ -85,17 +85,11 @@ void PktSrc::Opened(const Properties& arg_props)
}
if ( props.is_live )
{
Info(util::fmt("listening on %s\n", props.path.c_str()));
// We only register the file descriptor if we're in live
// mode because libpcap's file descriptor for trace files
// isn't a reliable way to know whether we actually have
// data to read.
if ( props.selectable_fd != -1 )
if ( ! iosource_mgr->RegisterFd(props.selectable_fd, this) )
reporter->FatalError("Failed to register pktsrc fd with iosource_mgr");
}
DBG_LOG(DBG_PKTIO, "Opened source %s", props.path.c_str());
}
@ -104,7 +98,7 @@ void PktSrc::Closed()
{
SetClosed(true);
if ( props.is_live && props.selectable_fd != -1 )
if ( props.selectable_fd != -1 )
iosource_mgr->UnregisterFd(props.selectable_fd, this);
DBG_LOG(DBG_PKTIO, "Closed source %s", props.path.c_str());

9
src/iosource/pcap/Source.cc
View file

@ -182,10 +182,11 @@ void PcapSource::OpenOffline()
return;
}
props.selectable_fd = fileno(pcap_file(pd));
if ( props.selectable_fd < 0 )
InternalError("OS does not support selectable pcap fd");
// We don't register the file descriptor if we're in offline mode,
// because libpcap's file descriptor for trace files isn't a reliable
// way to know whether we actually have data to read.
// See https://github.com/the-tcpdump-group/libpcap/issues/870
props.selectable_fd = -1;
props.link_type = pcap_datalink(pd);
props.is_live = false;