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#!/bin/sh
#
# shellsnoop - A program to print read/write details from shells,
# such as keystrokes and command outputs.
# Written using DTrace (Solaris 10 3/05).
#
# This program sounds somewhat dangerous (snooping keystrokes), but is
# no more so than /usr/bin/truss, and both need root or dtrace privileges to
# run. In fact, less dangerous, as we only print visible text (not password
# text, for example). Having said that, it goes without saying that this
# program shouldn't be used for breeching privacy of other users.
#
# This was written as a tool to demonstrate the capabilities of DTrace.
#
# $Id: shellsnoop 19 2007-09-12 07:47:59Z brendan $
#
# USAGE: shellsnoop [-hqsv] [-p PID] [-u UID]
#
# -q # quiet, only print data
# -s # include start time, us
# -v # include start time, string
# -p PID # process ID to snoop
# -u UID # user ID to snoop
# eg,
# shellsnoop # default output
# shellsnoop -v # human readable timestamps
# shellsnoop -p 1892 # snoop this PID only
# shellsnoop -qp 1892 # watch this PID data only
#
# FIELDS:
# UID User ID
# PID process ID
# PPID parent process ID
# COMM command name
# DIR direction (R read, W write)
# TEXT text contained in the read/write
# TIME timestamp for the command, us
# STRTIME timestamp for the command, string
#
# SEE ALSO: ttywatcher
#
# COPYRIGHT: Copyright (c) 2005 Brendan Gregg.
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License, Version 1.0 only
# (the "License"). You may not use this file except in compliance
# with the License.
#
# You can obtain a copy of the license at Docs/cddl1.txt
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# CDDL HEADER END
#
# Author: Brendan Gregg [Sydney, Australia]
#
# 28-Mar-2004 Brendan Gregg Created this.
# 21-Jan-2005 " " Wrapped in sh to provide options.
# 30-Nov-2005 " " Fixed trailing buffer text bug.
# 30-Nov-2005 " " Fixed sh no keystroke text in quiet bug.
# 30-Nov-2005 " " Last update.
#
##############################
# --- Process Arguments ---
#
opt_pid=0; opt_uid=0; opt_time=0; opt_timestr=0; opt_quiet=0; opt_debug=0
filter=0; pid=0; uid=0
while getopts dhp:qsu:v name
do
case $name in
d) opt_debug=1 ;;
p) opt_pid=1; pid=$OPTARG ;;
q) opt_quiet=1 ;;
s) opt_time=1 ;;
u) opt_uid=1; uid=$OPTARG ;;
v) opt_timestr=1 ;;
h|?) cat <<-END >&2
USAGE: shellsnoop [-hqsv] [-p PID] [-u UID]
shellsnoop # default output
-q # quiet, only print data
-s # include start time, us
-v # include start time, string
-p PID # process ID to snoop
-u UID # user ID to snoop
END
exit 1
esac
done
if [ $opt_quiet -eq 1 ]; then
opt_time=0; opt_timestr=0
fi
if [ $opt_pid -eq 1 -o $opt_uid -eq 1 ]; then
filter=1
fi
#################################
# --- Main Program, DTrace ---
#
dtrace -n '
/*
* Command line arguments
*/
inline int OPT_debug = '$opt_debug';
inline int OPT_quiet = '$opt_quiet';
inline int OPT_pid = '$opt_pid';
inline int OPT_uid = '$opt_uid';
inline int OPT_time = '$opt_time';
inline int OPT_timestr = '$opt_timestr';
inline int FILTER = '$filter';
inline int PID = '$pid';
inline int UID = '$uid';
#pragma D option quiet
#pragma D option switchrate=20hz
/*
* Print header
*/
dtrace:::BEGIN /OPT_time == 1/
{
printf("%-14s ","TIME");
}
dtrace:::BEGIN /OPT_timestr == 1/
{
printf("%-20s ","STRTIME");
}
dtrace:::BEGIN /OPT_quiet == 0/
{
printf("%5s %5s %8s %3s %s\n", "PID", "PPID", "CMD", "DIR", "TEXT");
}
/*
* Remember this PID is a shell child
*/
syscall::execve:entry
/execname == "sh" || execname == "ksh" || execname == "csh" ||
execname == "tcsh" || execname == "zsh" || execname == "bash"/
{
child[pid] = 1;
}
syscall::execve:entry
/(OPT_pid == 1 && PID != ppid) || (OPT_uid == 1 && UID != uid)/
{
/* forget if filtered */
child[pid] = 0;
}
/*
* Print shell keystrokes
*/
syscall::write:entry, syscall::read:entry
/(execname == "sh" || execname == "ksh" || execname == "csh" ||
execname == "tcsh" || execname == "zsh" || execname == "bash")
&& (arg0 >= 0 && arg0 <= 2)/
{
self->buf = arg1;
}
syscall::write:entry, syscall::read:entry
/(OPT_pid == 1 && PID != pid) || (OPT_uid == 1 && UID != uid)/
{
self->buf = 0;
}
syscall::write:return, syscall::read:return
/self->buf && child[pid] == 0 && OPT_time == 1/
{
printf("%-14d ", timestamp/1000);
}
syscall::write:return, syscall::read:return
/self->buf && child[pid] == 0 && OPT_timestr == 1/
{
printf("%-20Y ", walltimestamp);
}
syscall::write:return, syscall::read:return
/self->buf && child[pid] == 0 && OPT_quiet == 0/
{
this->text = (char *)copyin(self->buf, arg0);
this->text[arg0] = '\'\\0\'';
printf("%5d %5d %8s %3s %s\n", pid, curpsinfo->pr_ppid, execname,
probefunc == "read" ? "R" : "W", stringof(this->text));
}
syscall::write:return
/self->buf && child[pid] == 0 && OPT_quiet == 1/
{
this->text = (char *)copyin(self->buf, arg0);
this->text[arg0] = '\'\\0\'';
printf("%s", stringof(this->text));
}
syscall::read:return
/self->buf && execname == "sh" && child[pid] == 0 && OPT_quiet == 1/
{
this->text = (char *)copyin(self->buf, arg0);
this->text[arg0] = '\'\\0\'';
printf("%s", stringof(this->text));
}
syscall::write:return, syscall::read:return
/self->buf && child[pid] == 0/
{
self->buf = 0;
}
/*
* Print command output
*/
syscall::write:entry, syscall::read:entry
/child[pid] == 1 && (arg0 == 1 || arg0 == 2)/
{
self->buf = arg1;
}
syscall::write:return, syscall::read:return
/self->buf && OPT_time == 1/
{
printf("%-14d ", timestamp/1000);
}
syscall::write:return, syscall::read:return
/self->buf && OPT_timestr == 1/
{
printf("%-20Y ", walltimestamp);
}
syscall::write:return, syscall::read:return
/self->buf && OPT_quiet == 0/
{
this->text = (char *)copyin(self->buf, arg0);
this->text[arg0] = '\'\\0\'';
printf("%5d %5d %8s %3s %s", pid, curpsinfo->pr_ppid, execname,
probefunc == "read" ? "R" : "W", stringof(this->text));
/* here we check if a newline is needed */
this->length = strlen(this->text);
printf("%s", this->text[this->length - 1] == '\'\\n\'' ? "" : "\n");
self->buf = 0;
}
syscall::write:return, syscall::read:return
/self->buf && OPT_quiet == 1/
{
this->text = (char *)copyin(self->buf, arg0);
this->text[arg0] = '\'\\0\'';
printf("%s", stringof(this->text));
self->buf = 0;
}
/*
* Cleanup
*/
syscall::exit:entry
{
child[pid] = 0;
/* debug */
this->parent = (char *)curthread->td_proc->p_pptr->p_comm;
OPT_debug == 1 ? printf("PID %d CMD %s exited. (%s)\n",
pid, execname, stringof(this->parent)) : 1;
}
'
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