NAME¶

sc_pinger — scamper driver to run ping with different probe methods on a list of addresses.

SYNOPSIS¶

DESCRIPTION¶

The sc_pinger utility provides the ability to connect to a running scamper(1) instance and run ping on a set of IPv4 and IPv6 addresses. For each address in the file, sc_pinger will try ICMP, UDP, and TCP-ack probe methods to solicit responses from the address. sc_pinger will not try all methods if one method obtains responses. The output of sc_pinger is written to a warts(5) file, which can then be processed to extract details of responses. The options are as follows:

-?

prints a list of command line options and a synopsis of each.

-v

prints the version of sc_pinger and exits.

-D

causes sc_pinger to detach and become a daemon.

-a infile

specifies the name of the input file which consists of a sequence of IPv4 and IPv6 addresses, one per line.

-b batch-count

specifies the number of addresses sent to scamper(1) in each batch. This is useful when using a remote scamper instance, as the delay between where sc_pinger is run, and where the remote scamper(1) instance is, can restrict throughput. By default, sc_pinger sends a single address at a time.

-B bad-spec

specifies that sc_pinger should detect and remove bad probe methods at run time. A probe method is bad if sc_pinger receives an unlikely run of a single reply TTL value for a given probe method, suggesting that a middlebox close to scamper(1) synthesized responses. The available specifications are:

• rxttl-thresh=value: specifies the threshold that must be reached before declaring a run of single reply TTL values indicates a bad probe method.
• rxttl-window=value: specifies the size of the window sc_pinger should use to order probe responses. This parameter is necessary because probe responses can come back from scamper(1) out of order depending on how scamper(1) multiplexes workload. You should size this window large enough so that sc_pinger is likely to consider all responses in order.

Both specifications are necessary if either are used.

-c probe-count

specifies the number of probes to send for each method. sc_pinger accepts two formats: a single integer that specifies the number of probes (and responses) desired; or, two integers, separated by /, that specify the number of responses desired and maximum number of probes to send. By default, sc_pinger seeks three responses from up to five probes.

-l limit

specifies the number of objects to write to an output file, before closing it and opening the next file. The output file must contain a %u format specifier, which sc_pinger uses to embed a counter value that increments with each new output file. If the user uses the move option, sc_pinger moves the file when it closes the file.

-m method

specifies a single probe method to try. The available probe methods are the same as scamper's ping implementation, listed in scamper(1) manual page. By default, sc_pinger uses ICMP-echo, UDP-dport, and TCP-ack-sport to destination port 80.

-M move-dir

specifies the name of the directory to move completed files to. By default, sc_pinger leaves completed files in place.

-o outfile

specifies the name of the output file to be written. The output file will use the warts(5) format.

-p port

specifies the port on the local host where scamper(1) is accepting control socket connections.

-R unix-remote

specifies the name of a unix domain socket on the local host where a remote scamper(1) instance is accepting commands. The unix-remote parameter can either be a unix domain socket for a single remote scamper(1) instance, or be a sc_remoted(1) mux socket with the name of the remote VP encoded after a trailing slash.

-t logfile

specifies the name of a file to log output from sc_pinger generated at run time.

-U unix-local

specifies the name of a unix domain socket on the local host where a local scamper(1) instance is accepting commands.

-Z zombie-time

specifies the length of time, in seconds, before deciding scamper(1) has gone unresponsive and exiting. The minimum length of time is ten seconds. By default, sc_pinger will wait indefinitely. This option is useful when using sc_pinger with a remote scamper process.

EXAMPLES¶

Given a set of IPv4 and IPv6 address sets in a file named infile.txt:

192.0.2.1
192.0.32.10
192.0.31.60
2001:db8::1

and a scamper(1) daemon listening on port 31337, then these addresses can be probed using:

To send 4 probes, and stop after receiving two responses:

To use ICMP-echo and TCP-syn probes to destination port 443:

The following command writes a series of gzip-compressed warts(5) files, each of which have up to 1000 objects in them, with names such as outfile_0000.warts.gz, outfile_0001.warts.gz, moving them to the finished directory:

A user can concatenate these files into a final bzip2-compressed warts(5) file with sc_wartscat(1):

Given a sc_remoted(1) process listening on a unix domain socket named /path/to/socket, and a remote vantage point named 'foo' connected to the controller, probe the addresses with the remote vantage point using:

SEE ALSO¶

scamper(1), sc_minrtt(1), sc_remoted(1), sc_wartscat(1), sc_wartsdump(1), sc_warts2json(1), sc_warts2text(1)

AUTHORS¶

sc_pinger was written by Matthew Luckie <mjl@luckie.org.nz>.