extcap: add sshdump.

sshdump is an extcap module that allows dumping from a remote host using an ssh connection.
It goes with the existing extcap plugin interface.

Change-Id: I8987614fdd817b8173a50130812bc643a4833bca
Reviewed-on: https://code.wireshark.org/review/11402
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

1 files changed, 212 insertions, 0 deletions

diff --git a/doc/sshdump.pod b/doc/sshdump.pod
new file mode 100644
index 0000000000..6defdf1d74
--- /dev/null
+++ b/doc/sshdump.pod
@@ -0,0 +1,212 @@
+
+=head1 NAME
+
+sshdump - Provide interfaces to capture from a remote host through SSH using a remote capture binary.
+
+=head1 SYNOPSIS
+
+B<sshdump>
+S<[ B<--help> ]>
+S<[ B<--version> ]>
+S<[ B<--extcap-interfaces> ]>
+S<[ B<--extcap-dlts> ]>
+S<[ B<--extcap-interface>=E<lt>interfaceE<gt> ]>
+S<[ B<--extcap-config> ]>
+S<[ B<--extcap-capture-filter>=E<lt>capture filterE<gt> ]>
+S<[ B<--capture> ]>
+S<[ B<--fifo>=E<lt>path to file or pipeE<gt> ]>
+S<[ B<--remote-host>=E<lt>IP addressE<gt> ]>
+S<[ B<--remote-port>=E<lt>TCP portE<gt> ]>
+S<[ B<--remote-username>=E<lt>usernameE<gt> ]>
+S<[ B<--remote-password>=E<lt>passwordE<gt> ]>
+S<[ B<--sshkey>=E<lt>public key path<gt> ]>
+S<[ B<--remote-interface>=E<lt>interfaceE<gt> ]>
+S<[ B<--remote-capture-bin>=E<lt>capture binaryE<gt> ]>
+
+B<sshdump>
+S< B<--extcap-interfaces> >
+
+B<sshdump>
+S< B<--extcap-interface>=E<lt>interfaceE<gt> >
+S<[ B<--extcap-dlts> ]>
+
+B<sshdump>
+S< B<--extcap-interface>=E<lt>interfaceE<gt> >
+S<[ B<--extcap-config> ]>
+
+B<sshdump>
+S< B<--extcap-interface>=E<lt>interfaceE<gt> >
+S< B<--fifo>=E<lt>path to file or pipeE<gt> >
+S< B<--capture> >
+S< B<--remote-host=myremotehost> >
+S< B<--remote-port=22> >
+S< B<--remote-username=user> >
+S< B<--remote-interface=eth2> >
+S< B<--remote-capture-bin=/usr/sbin/dumpcap> >
+
+=head1 DESCRIPTION
+
+B<Sshdump> is a extcap tool that allows to run a remote capture
+tool in a SSH connection. The requirement is that the capture
+executable must have the capabilities to capture from the wanted
+interface.
+
+The feature is functionally equivalent to run commands like
+
+$ ssh remoteuser@remotehost -p 22222 'dumpcap -i IFACE -P -w -' > FILE &
+$ wireshark FILE
+
+$ ssh remoteuser@remotehost '/sbin/dumpcap -i IFACE -P -w - -f "not port 22"' > FILE &
+$ wireshark FILE
+
+Supported interfaces:
+
+=over 4
+
+=item 1. ssh
+
+=back
+
+=head1 OPTIONS
+
+=over 4
+
+=item --help
+
+Print program arguments.
+
+=item --version
+
+Print program version.
+
+=item --extcap-interfaces
+
+List available interfaces.
+
+=item --extcap-interface=E<lt>interfaceE<gt>
+
+Use specified interfaces.
+
+=item --extcap-dlts
+
+List DLTs of specified interface.
+
+=item --extcap-config
+
+List configuration options of specified interface.
+
+=item --capture
+
+Start capturing from specified interface save saved it in place specified by --fifo.
+
+=item --fifo=E<lt>path to file or pipeE<gt>
+
+Save captured packet to file or send it through pipe.
+
+=item --remote-host=E<lt>remote hostE<gt>
+
+The address of the remote host for capture.
+
+=item --remote-port=E<lt>remote portE<gt>
+
+The SSH port of the remote host.
+
+=item --remote-username=E<lt>usernameE<gt>
+
+The username for ssh authentication.
+
+=item --remote-password=E<lt>passwordE<gt>
+
+The password to use (if not ssh-agent and pubkey are used). WARNING: the
+passwords are stored in plaintext and visible to all users on this system. It is
+recommended to use keyfiles with a SSH agent.
+
+=item --sshkey=E<lt>SSH private key pathE<gt>
+
+The path to a private key for authentication.
+
+=item --remote-interface=E<lt>remote interfaceE<gt>
+
+The remote network interface to capture from.
+
+=item --remote-capture-bin=E<lt>capture binaryE<gt>
+
+The remote capture binary.
+
+=item --extcap-capture-filter=E<lt>capture filterE<gt>
+
+The capture filter
+
+=back
+
+=head1 EXAMPLES
+
+To see program arguments:
+
+    sshdump --help
+
+To see program version:
+
+    sshdump --version
+
+To see interfaces:
+
+    sshdump --extcap-interfaces
+
+Only one interface (ssh) is supported.
+
+  Output:
+    interface {value=ssh}{display=SSH remote capture}
+
+To see interface DLTs:
+
+    sshdump --extcap-interface=ssh --extcap-dlts
+
+  Output:
+    dlt {number=147}{name=ssh}{display=Remote capture dependant DLT}
+
+To see interface configuration options:
+
+    sshdump --extcap-interface=ssh --extcap-config
+
+  Output:
+    arg {number=0}{call=--remote-host}{display=Remote SSH server address}{type=string}{default=127.0.0.1}
+    {tooltip=The remote SSH host. It can be both an IP address or an hostname}
+    arg {number=1}{call=--remote-port}{display=Remote SSH server port}{type=unsigned}{default=22}
+    {tooltip=The remote SSH host port}
+    arg {number=2}{call=--remote-username}{display=Remote SSH server username}{type=string}{default=dario}
+    {tooltip=The remote SSH username. If not provided, the current user will be used}
+    arg {number=3}{call=--remote-password}{display=Remote SSH server password}{type=string}
+    {tooltip=The SSH password. SSH agent and certificate are used before it.If they fail, password will
+    be used, and, if it fails, the connection is not established.}
+    arg {number=4}{call=--remote-interface}{display=Remote SSH server interface}{type=string}{default=eth0}
+    {tooltip=The remote network interface used for capture}
+    arg {number=5}{call=--remote-capture-bin}{display=Remote SSH capture bin}{type=string}{default=dumpcap}
+    {tooltip=The remote dumcap binary used for capture.}
+    arg {number=6}{call=--extcap-capture-filter}{display=Capture filter}{type=string}{default=not host hardcore}
+    {tooltip=The capture filter}
+
+To capture:
+
+    sshdump --extcap-interface=ssh --fifo=/tmp/ssh.pcapng --capture --remote-host 192.168.1.10
+    --remote-username user --extcap-capture-filter "not port 22"
+
+NOTE: To stop capturing CTRL+C/kill/terminate application.
+
+=head1 SEE ALSO
+
+wireshark(1), tshark(1), dumpcap(1), extcap(4)
+
+=head1 NOTES
+
+B<Sshdump> is part of the B<Wireshark> distribution.  The latest version
+of B<Wireshark> can be found at L<https://www.wireshark.org>.
+
+HTML versions of the Wireshark project man pages are available at:
+L<https://www.wireshark.org/docs/man-pages>.
+
+=head1 AUTHORS
+
+  Original Author
+  -------- ------
+  Dario Lombardo             <lomato[AT]gmail.com>