Read a pcap or pcapng file with packet filtering. More...

#include <tsPcapFilter.h>

Inheritance diagram for ts::PcapFilter:

[legend]

Collaboration diagram for ts::PcapFilter:

Public Member Functions
	PcapFilter ()=default
	Default constructor.

bool	addressFilterIsSet () const
	Check if the address filter is precisely set.

virtual void	clearProtocolFilter ()
	Clear the set of protocols to filter, all protocols are accepted.

virtual void	close ()
	Close the file.

void	defineArgs (Args &args)
	Add command line option definitions in an Args.

const IPSocketAddress &	destinationFilter () const
	Get the current destination filter.

bool	endOfFile () const
	Check if the end of file (or other error) has been reached.

fs::path	fileName () const
	Get the file name.

uint64_t	fileSize () const
	Get the total file size in bytes so far.

cn::microseconds	firstTimestamp () const
	Get the capture timestamp of the first packet in the file.

uint64_t	ipPacketCount () const
	Get the number of valid captured IP packets so far.

bool	isOpen () const
	Check if the file is open.

cn::microseconds	lastTimestamp () const
	Get the capture timestamp of the last packet which was read from the file.

bool	loadArgs (DuckContext &duck, Args &args)
	Load arguments from command line.

virtual bool	open (const fs::path &filename, Report &report) override
	Open the file for read.

const IPSocketAddress &	otherFilter (const IPSocketAddress &addr) const
	Get the "other" filter (source or destination) based on the other one.

uint64_t	packetCount () const
	Get the number of captured packets so far.

virtual bool	readIP (IPPacket &packet, VLANIdStack &vlans, cn::microseconds &timestamp, Report &report) override
	Read the next IP packet, IPv4 or IPv6, headers included.

virtual void	setBidirectionalFilter (const IPSocketAddress &addr1, const IPSocketAddress &addr2)
	Set a bidirectional address filter.

virtual void	setDestinationFilter (const IPSocketAddress &addr)
	Set a destination address filter.

void	setFirstPacketFilter (size_t count)
	Filter packets starting at the specified number.

void	setFirstTimeOffset (cn::microseconds time)
	Filter packets starting at the specified time offset from the beginning of the file.

void	setFirstTimestamp (cn::microseconds time)
	Filter packets starting at the specified timestamp.

void	setLastPacketFilter (size_t count)
	Filter packets up to the specified number.

void	setLastTimeOffset (cn::microseconds time)
	Filter packets up to the specified time offset from the beginning of the file.

void	setLastTimestamp (cn::microseconds time)
	Filter packets up to the specified timestamp.

virtual void	setProtocolFilter (const std::set< uint8_t > &protocols)
	Filter packets with the specified set of protocols.

virtual void	setProtocolFilterTCP ()
	Filter TCP packets only.

virtual void	setProtocolFilterUDP ()
	Filter UDP packets only.

void	setReportAddressesFilterSeverity (int level)
	Specify the severity to report the filtered addresses once (in non-wildcard mode).

virtual void	setSourceFilter (const IPSocketAddress &addr)
	Set a source address filter.

virtual void	setWildcardFilter (bool on)
	Set the source and destination address filter in wildcard mode.

const IPSocketAddress &	sourceFilter () const
	Get the current source filter.

cn::microseconds	timeOffset (cn::microseconds timestamp) const
	Compute the time offset from the beginning of the file of a packet timestamp.

uint64_t	totalIPPacketsSize () const
	Get the total size in bytes of valid captured IP packets so far.

uint64_t	totalPacketsSize () const
	Get the total size in bytes of captured packets so far.

Static Public Member Functions
static Time	ToTime (cn::microseconds timestamp)
	Compute the date and time from a packet timestamp.

Detailed Description

Read a pcap or pcapng file with packet filtering.

This class also sets filtering options from the command line: --first-packet, --first-timestamp, --first-date, --last-packet, --last-timestamp, --last-date.

Member Function Documentation

◆ setFirstPacketFilter()

void ts::PcapFilter::setFirstPacketFilter ( size_t count )

inline

Filter packets starting at the specified number.

The packet numbering counts all captured packets from the beginning of the file, starting at 1. This is the same value as seen on Wireshark in the leftmost column.

Parameters

[in] count Number of first captured packet to read.

◆ setLastPacketFilter()

void ts::PcapFilter::setLastPacketFilter ( size_t count )

inline

Filter packets up to the specified number.

The packet numbering counts all captured packets from the beginning of the file, starting at 1. This is the same value as seen on Wireshark in the leftmost column.

Parameters

[in] count Number of last captured packet to read.

◆ setFirstTimeOffset()

void ts::PcapFilter::setFirstTimeOffset ( cn::microseconds time )

inline

Filter packets starting at the specified time offset from the beginning of the file.

This is the same value as seen on Wireshark in the "Time" column (in seconds).

Parameters

[in] time First time offset in microseconds from the beginning of the capture.

◆ setLastTimeOffset()

void ts::PcapFilter::setLastTimeOffset ( cn::microseconds time )

inline

Filter packets up to the specified time offset from the beginning of the file.

This is the same value as seen on Wireshark in the "Time" column (in seconds).

Parameters

[in] time Last time offset in microseconds from the beginning of the capture.

◆ setFirstTimestamp()

void ts::PcapFilter::setFirstTimestamp ( cn::microseconds time )

inline

Filter packets starting at the specified timestamp.

Parameters

[in] time First timestamp, in microseconds from the UNIX epoch.

See also: ts::Time::UnixEpoch

◆ setLastTimestamp()

void ts::PcapFilter::setLastTimestamp ( cn::microseconds time )

inline

Filter packets up to the specified timestamp.

Parameters

[in] time Last timestamp, in microseconds from the UNIX epoch.

See also: ts::Time::UnixEpoch

◆ setProtocolFilter()

virtual void ts::PcapFilter::setProtocolFilter ( const std::set< uint8_t > & protocols )

virtual

Filter packets with the specified set of protocols.

Parameters

[in] protocols A set of 8-bit protocol values (eg. IPv4_PROTO_TCP, IPv4_PROTO_ICMP, etc.) If the filter is empty, all packets are passed (same as all protocol values set).

◆ setSourceFilter()

virtual void ts::PcapFilter::setSourceFilter ( const IPSocketAddress & addr )

virtual

Set a source address filter.

Parameters

[in] addr Source address to filter. The port is meaningful only with TCP and UDP.

See also: setWildcardFilter()

◆ setDestinationFilter()

virtual void ts::PcapFilter::setDestinationFilter ( const IPSocketAddress & addr )

virtual

Set a destination address filter.

Parameters

[in] addr Destination address to filter. The port is meaningful only with TCP and UDP.

See also: setWildcardFilter()

◆ setBidirectionalFilter()

virtual void ts::PcapFilter::setBidirectionalFilter	(	const IPSocketAddress &	addr1,
		const IPSocketAddress &	addr2
	)

virtual

Set a bidirectional address filter.

Select packets where the source and destination addresses match the pair of filtered address, in any direction.

Parameters

[in]	addr1	First address to filter, either source or destination. The port is meaningful only with TCP and UDP.
[in]	addr2	Second address to filter, either source or destination. The port is meaningful only with TCP and UDP.

See also: setWildcardFilter()

Reimplemented in ts::PcapStream.

◆ sourceFilter()

const IPSocketAddress & ts::PcapFilter::sourceFilter ( ) const

inline

Get the current source filter.

In the case of non-wildcard filtering, after returning the first packet, this is the actual socket address of the filtered stream.

In the case of bidirectional filtering (for instance a TCP session), there is no real "source" or "destination". They are the two endpoints of the stream.

Returns: A constant reference to the current source filter.

See also: setWildcardFilter()

◆ destinationFilter()

const IPSocketAddress & ts::PcapFilter::destinationFilter ( ) const

inline

Get the current destination filter.

In the case of non-wildcard filtering, after returning the first packet, this is the actual socket address of the filtered stream.

In the case of bidirectional filtering (for instance a TCP session), there is no real "source" or "destination". They are the two endpoints of the stream.

Returns: A constant reference to the current source filter.

See also: setWildcardFilter()

◆ setWildcardFilter()

virtual void ts::PcapFilter::setWildcardFilter ( bool on )

virtual

Set the source and destination address filter in wildcard mode.

When the address filter is in wildcard mode (the default), the unspecified parts of source and destination, address or port, act as wildcard for all packets.

When the wildcard mode is set to false, the first packet which matches the unspecified parts forces the addresses of that packet. In other words, the first packet which matches the wildcard forces a specific stream and all subsequent packets are filtered for that specific stream.

Parameters

[in] on If true, use wildcard mode for all packets. If false, the first packet which matches the wildcard forces a specific stream.

◆ addressFilterIsSet()

bool ts::PcapFilter::addressFilterIsSet ( ) const

Check if the address filter is precisely set.

Using address filtering, some addresses or port may be unspecified, acting as a wildcard. In non-wildcard mode, the first packet matching this wildcard is selected and the corresponding stream is then exclusively filtered. At this point, the filter is precisely set.

Returns: True if the address filter is precisely set.

◆ otherFilter()

const IPSocketAddress & ts::PcapFilter::otherFilter ( const IPSocketAddress & addr ) const

Get the "other" filter (source or destination) based on the other one.

Parameters

[in] addr A socket address, typically matching the source or destination filter.

Returns: A constant reference to the other filter. If addr matches neither the source nor the destination filter, return an empty socket address.

◆ setReportAddressesFilterSeverity()

void ts::PcapFilter::setReportAddressesFilterSeverity ( int level )

inline

Specify the severity to report the filtered addresses once (in non-wildcard mode).

In non-wildcard mode, when the filtered addresses contain non-specified fields, the first packet which matches the filters define the stream. At this point, the selected stream is displayed (in debug mode by default). This function redefines the severity level (info or verbose for instance).

Parameters

[in] level Severity level to use.

◆ defineArgs()

void ts::PcapFilter::defineArgs ( Args & args )

Add command line option definitions in an Args.

Parameters

[in,out] args Command line arguments to update.

◆ loadArgs()

bool ts::PcapFilter::loadArgs	(	DuckContext &	duck,
		Args &	args
	)

Load arguments from command line.

Args error indicator is set in case of incorrect arguments.

Parameters

[in,out]	duck	TSDuck execution context.
[in,out]	args	Command line arguments.

Returns: True on success, false on error in argument line.

◆ open()

virtual bool ts::PcapFilter::open	(	const fs::path &	filename,
		Report &	report
	)

overridevirtual

Open the file for read.

Parameters

[in]	filename	File name. If empty or "-", use standard input.
[in,out]	report	Where to report errors.

Returns: True on success, false on error.

Reimplemented from ts::PcapFile.

Reimplemented in ts::PcapStream.

◆ readIP()

virtual bool ts::PcapFilter::readIP	(	IPPacket &	packet,
		VLANIdStack &	vlans,
		cn::microseconds &	timestamp,
		Report &	report
	)

overridevirtual

Read the next IP packet, IPv4 or IPv6, headers included.

Skip intermediate metadata and other types of packets.

Parameters

[out]	packet	Received IP packet.
[out]	vlans	Stack of VLAN encapsulation from which the packet is extracted.
[out]	timestamp	Capture timestamp in microseconds since Unix epoch or -1 if none is available.
[in,out]	report	Where to report error.

Returns: True on success, false on error.

Reimplemented from ts::PcapFile.

◆ isOpen()

bool ts::PcapFile::isOpen ( ) const

inlineinherited

Check if the file is open.

Returns: True if the file is open, false otherwise.

◆ fileName()

fs::path ts::PcapFile::fileName ( ) const

inlineinherited

Get the file name.

Returns: The file name as specified in open(). If the standard input is used, return "standard input".

◆ packetCount()

uint64_t ts::PcapFile::packetCount ( ) const

inlineinherited

Get the number of captured packets so far.

This includes all packets, not only IP packets. This value is the number of the last returned packet, as seen in the left-most column in Wireshark interface.

Returns: The number of captured packets so far.

◆ endOfFile()

bool ts::PcapFile::endOfFile ( ) const

inlineinherited

Check if the end of file (or other error) has been reached.

Returns: True on end of file or error.

◆ ipPacketCount()

uint64_t ts::PcapFile::ipPacketCount ( ) const

inlineinherited

Get the number of valid captured IP packets so far.

Returns: The number of valid captured IP packets so far.

◆ fileSize()

uint64_t ts::PcapFile::fileSize ( ) const

inlineinherited

Get the total file size in bytes so far.

Returns: The total file size in bytes so far.

◆ totalPacketsSize()

uint64_t ts::PcapFile::totalPacketsSize ( ) const

inlineinherited

Get the total size in bytes of captured packets so far.

This includes all packets, including link-layer headers when present.

Returns: The total size in bytes of captured packets so far.

◆ totalIPPacketsSize()

uint64_t ts::PcapFile::totalIPPacketsSize ( ) const

inlineinherited

Get the total size in bytes of valid captured IP packets so far.

This includes all IP headers but not link-layer headers when present.

Returns: The total size in bytes of valid captured IP packets so far.

◆ firstTimestamp()

cn::microseconds ts::PcapFile::firstTimestamp ( ) const

inlineinherited

Get the capture timestamp of the first packet in the file.

Returns: Capture timestamp in microseconds since Unix epoch or -1 if none is available.

◆ lastTimestamp()

cn::microseconds ts::PcapFile::lastTimestamp ( ) const

inlineinherited

Get the capture timestamp of the last packet which was read from the file.

Returns: Capture timestamp in microseconds since Unix epoch or -1 if none is available.

◆ timeOffset()

cn::microseconds ts::PcapFile::timeOffset ( cn::microseconds timestamp ) const

inlineinherited

Compute the time offset from the beginning of the file of a packet timestamp.

Parameters

[in] timestamp Capture timestamp of a packet in the file.

Returns: Time offset in microseconds of the packet from the beginning of the file.

◆ ToTime()

static Time ts::PcapFile::ToTime ( cn::microseconds timestamp )

inlinestaticinherited

Compute the date and time from a packet timestamp.

Parameters

[in] timestamp Capture timestamp of a packet in a file.

Returns: Corresponding date or Epoch in case of error.

◆ close()

virtual void ts::PcapFile::close ( )

virtualinherited

Close the file.

Do not reset counters, file names, etc. The last values before close() are still accessible.

The documentation for this class was generated from the following file:

tsPcapFilter.h

Public Member Functions

Static Public Member Functions

Detailed Description

Member Function Documentation

◆ setFirstPacketFilter()

◆ setLastPacketFilter()

◆ setFirstTimeOffset()

◆ setLastTimeOffset()

◆ setFirstTimestamp()

◆ setLastTimestamp()

◆ setProtocolFilter()

◆ setSourceFilter()

◆ setDestinationFilter()

◆ setBidirectionalFilter()

◆ sourceFilter()

◆ destinationFilter()

◆ setWildcardFilter()

◆ addressFilterIsSet()

◆ otherFilter()

◆ setReportAddressesFilterSeverity()

◆ defineArgs()

◆ loadArgs()

◆ open()

◆ readIP()

◆ isOpen()

◆ fileName()

◆ packetCount()

◆ endOfFile()

◆ ipPacketCount()

◆ fileSize()

◆ totalPacketsSize()

◆ totalIPPacketsSize()

◆ firstTimestamp()

◆ lastTimestamp()

◆ timeOffset()

◆ ToTime()

◆ close()