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RTI Connext Modern C++ API Version 7.2.0
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Save network traffic into a capture file for further analysis. More...
Classes | |
| class | rti::util::network_capture::ContentKindMask |
| <<extension>> Mask indicating the types of contents to remove from RTPS frames before saving them to the capture file. More... | |
| class | rti::util::network_capture::TrafficKindMask |
| <<extension>> Mask indicating the traffic direction to capture. More... | |
| class | rti::util::network_capture::NetworkCaptureParams |
| <<extension>> Input parameters for starting Network Capture. More... | |
Functions | |
| bool | rti::util::network_capture::enable () |
| Enable Network Capture. More... | |
| bool | rti::util::network_capture::disable () |
| Disable Network Capture. More... | |
| bool | rti::util::network_capture::set_default_params (const NetworkCaptureParams ¶ms) |
| Set the default Network Capture parameters. More... | |
| bool | rti::util::network_capture::start (const std::string &filename) |
| Start Network Capture. More... | |
| bool | rti::util::network_capture::start (dds::domain::DomainParticipant participant, const std::string &filename) |
| Start Network Capture for a participant. More... | |
| bool | rti::util::network_capture::start (const std::string &filename, const NetworkCaptureParams ¶ms) |
| Start Network Capture with parameters. More... | |
| bool | rti::util::network_capture::start (dds::domain::DomainParticipant participant, const std::string &filename, const NetworkCaptureParams ¶ms) |
| Start Network Capture with parameters for a participant. More... | |
| bool | rti::util::network_capture::stop () |
| Stop Network Capture. More... | |
| bool | rti::util::network_capture::stop (dds::domain::DomainParticipant participant) |
| Stop Network Capture. More... | |
| bool | rti::util::network_capture::pause () |
| Pause Network Capture. More... | |
| bool | rti::util::network_capture::pause (dds::domain::DomainParticipant participant) |
| Pause Network Capture. More... | |
| bool | rti::util::network_capture::resume () |
| Resume Network Capture. More... | |
| bool | rti::util::network_capture::resume (dds::domain::DomainParticipant participant) |
| Resume Network Capture. More... | |
Save network traffic into a capture file for further analysis.
RTI Connext allows you to capture the network traffic that one or more DomainParticipants send or receive. This feature can be used to analyze and debug communication problems between your DDS applications. When network capture is enabled, each DomainParticipant will generate a pcap-based file that can then be opened by a packet analyzer like Wireshark, provided the right dissectors are installed.
To some extent, network capture can be used as an alternative to existing pcap-based network capture software (such as Wireshark). This will be the case when you are only interested in analyzing the traffic a DomainParticipant sends/receives. In this scenario, network capture will actually have some advantages over using more general pcap-based network capture applications: RTI's network capture includes additional information such as security-related data; it also removes information that is not needed, such as user data, when you want to reduce the capture size. That said, RTI's network capture is not a replacement for other pcap-based network capture applications: it only captures the traffic exchanged by the DomainParticipants, but it does not capture any other traffic exchanged through the system network interfaces.
To capture network traffic network_capture::enable() must be invoked before creating any DomainParticipant. Similarly, network_capture::disable() must be called after deleting all participants. In between these calls, you may start, stop, pause or resume capturing traffic for one or all participants.
Shared Memory Traffic
Every RTPS frame in network capture has a source and a destination associated with it. In the case of shared memory traffic, a process identifier and a port determine the source and destination endpoints.
Access to the process identifier (PID) of the source for inbound traffic requires changes in the shared memory segments. These changes would break shared memory compatibility with previous versions of RTI Connext. For this reason, by default, network capture will not populate the value of the source PID for inbound shared memory traffic.
If interoperability with previous versions of RTI Connext is not necessary, you can generate capture files containing the source PID for inbound traffic. To do so, configure the value of the 'dds.transport.minimum_compatibility_version' property to 6.1.0. (See rti::core::policy::Property).
This property is never propagated, so it must be consistently configured throughout the whole system.
Note: Changing the value of this property affects the type of shared memory segments that RTI Connext uses. For that reason, you may see the following warning, resulting from leftover shared memory segments:
The leftover shared memory segments can be removed using the ipcrm command. See https://community.rti.com/kb/what-are-possible-solutions-common-shared-memory-issues for more information.
| bool rti::util::network_capture::enable | ( | ) |
Enable Network Capture.
This method must be called before any other Network Capture method. It must also be called before creating the participants for which we want to capture traffic.
Use this method only for debugging purposes, since it may introduce a significant performance impact.
Referenced by rti::core::policy::Monitoring::enable(), rti::queuing::QueueConsumerParams::enable_availability(), rti::queuing::QueueRequesterParams::enable_availability(), rti::queuing::QueueReplierParams::enable_availability(), rti::queuing::QueueRequesterParams::enable_sample_replication(), rti::queuing::QueueReplierParams::enable_sample_replication(), rti::queuing::QueueProducerParams::enable_wait_for_ack(), rti::queuing::QueueRequesterParams::enable_wait_for_ack(), and rti::queuing::QueueReplierParams::enable_wait_for_ack().
| bool rti::util::network_capture::disable | ( | ) |
Disable Network Capture.
This method must be the last Network Capture method to be called. It must also be called after deleting the participants for which we captured traffic. Disabling Network Capture without stopping it first is not ok!
| bool rti::util::network_capture::set_default_params | ( | const NetworkCaptureParams & | params | ) |
Set the default Network Capture parameters.
The default parameters are used when Network Capture is started without parameters, i.e., network_capture::start().
| params | <<in>>. Configuration parameters that we want to set as defaults. |
| bool rti::util::network_capture::start | ( | const std::string & | filename | ) |
Start Network Capture.
| filename | <<in>>. The name of the output capture file will be based on this input parameter. |
In particular, the name for the capture file is the concatenation of the filename input parameter, the "_GUID-" string followed by the decimal representation of bytes 8-11 of the DomainParticipant's GUID, and the file extension (".pcap").
| bool rti::util::network_capture::start | ( | dds::domain::DomainParticipant | participant, |
| const std::string & | filename | ||
| ) |
Start Network Capture for a participant.
| participant | <<in>>. DomainParticipant for which we want to capture traffic. |
| filename | <<in>>. The name of the output capture file will be based on this input parameter. |
In particular, the name for the capture file is the concatenation of the filename input parameter, and the file extension (".pcap").
| bool rti::util::network_capture::start | ( | const std::string & | filename, |
| const NetworkCaptureParams & | params | ||
| ) |
Start Network Capture with parameters.
Perfoms the same function as network_capture::start() except that it uses the provided parameters, instead of the default ones.
| filename | <<in>>. The name of the output capture file will be based on this input parameter. |
In particular, the name for the capture file is the concatenation of the filename input parameter, the "_GUID-" string followed by the decimal representation of bytes 8-11 of the DomainParticipant's GUID, and the file extension (".pcap").
| params | <<in>>. Configuration parameters for the capture. |
| bool rti::util::network_capture::start | ( | dds::domain::DomainParticipant | participant, |
| const std::string & | filename, | ||
| const NetworkCaptureParams & | params | ||
| ) |
Start Network Capture with parameters for a participant.
| participant | <<in>>. DomainParticipant for which we want to capture traffic. |
| filename | <<in>>. The name of the output capture file will be based on this input parameter. |
In particular, the name for the capture file is the concatenation of the filename input parameter, and the file extension (".pcap").
| params | <<in>>. Parameters for configuring the capture. |
| bool rti::util::network_capture::stop | ( | ) |
Stop Network Capture.
This method can (and must) be called after network_capture::start(), not network_capture::start(dds::domain::DomainParticipant, const std::string &). That is, if we start capturing traffic globally (for all DomainParticipants), we must stop capturing traffic also globally. It is not possible to start capturing traffic for a participant but stop it globally.
It is possible to start capturing globally and then stop capturing for a participant, as long as we eventually stop capturing traffic globally.
We must stop capturing for a participant before deleting it.
| bool rti::util::network_capture::stop | ( | dds::domain::DomainParticipant | participant | ) |
Stop Network Capture.
| participant | <<in>>. DomainParticipant for which we want to stop capturing traffic. |
| bool rti::util::network_capture::pause | ( | ) |
Pause Network Capture.
| bool rti::util::network_capture::pause | ( | dds::domain::DomainParticipant | participant | ) |
Pause Network Capture.
| participant | <<in>>. DomainParticipant for which we want to pause capturing traffic. |
| bool rti::util::network_capture::resume | ( | ) |
Resume Network Capture.
| bool rti::util::network_capture::resume | ( | dds::domain::DomainParticipant | participant | ) |
Resume Network Capture.
| participant | <<in>>. DomainParticipant for which we want to resume capturing traffic. |