socket (buffer) overflow detection tool – sodt

Name: sodt (套接字缓存溢出探测器)

Language: KSH

Destination: Detect socket buffer overflow for certain process real-timely

Orignal Intention: Confirm messages lost caused by socket buffer overflow

Version: 0.1

Supported Protocol: UDP/TCP/SCTP

Supported OS: Linux/FreeBSD

Note: ‘root’ permission is preferred to avoid OS kernel error

Example: ./sodt -p udp -n H248: detect socket overflow for H248 with sampling rate 1 second

Phase II (if time is ok……): TBD


# Socket (buffer) Overflow Detection Tool – sodt
# Version 0.1
# Aug 9, 2010
# Changes:
# Version 0.1 –
#       SCTP support on Linux
# Version 0.0 – Aug 4, 2010
#       TCP/UDP support on Linux/FreeBSD

# func:
show_usage() {
        echo “Usage: sodt [-h] [-p <protocol>] [-n <name>] [-s <sampling>]”
        echo ”  -h print this help message”
        echo ”  -p protocol of the socket: udp/tcp”
        echo ”  -n name of process using socket”
        echo ”  -s sampling rate for sodt, default time is 1 second”
        echo “For detailed information about this tool, please refer to:”
        echo “
        echo “Any feedback or suggestion please mail to:”
        echo “

# Check the OS on which sodt is running
# Only Linux/FreeBSD is supported, as Solaris does not have ‘sysctl’

if [ “$OSNAME” != “Linux” ] && [ “$OSNAME” != “FreeBSD” ]
        echo “Error: only Linux/FreeBSD is supported by ‘sodt'”
        exit 1

# Parameters’ processing for ‘sodt’

typeset -i VAR_H
typeset -i VAR_N
typeset -i VAR_P
typeset -i VAR_S
export PROTOCOL=””
export PRONAME=””
export SLEEPTIME=””

if [ “$#” != 0 ]
        while getopts hp:n:s: VAR
                case $VAR in
                                exit 1

        shift $(($OPTIND – 1))

        if [ -n “$VAR_R_ARG” ] || [ “$VAR_N” = 0 ] || [ “$VAR_P” = 0 ] || [ “$VAR_H” = 1 ]
                exit 1
                if [ “$PROTOCOL” != “udp” ] && [ “$PROTOCOL” != “tcp” ] && [ “$PROTOCOL” != “sctp” ]
                        echo “Error: unsupported protocol. Only UDP/TCP/SCTP is supported by ‘sodt'”
                        exit 1

                if [ “$VAR_S” = 0 ]
                        echo “sodt: Take default sampling interval 1 second”
        exit 1

# Check if this machine is Linux, if kernel supports SCTP, if SCTP module is loaded, if SCTP is enabled
# and if ‘netstat’ supports SCTP parameter, when ‘sctp’ is chosen
# Use ‘checksctp’ in ‘lksctp-tool’ to cover all testings above.

if [ “$PROTOCOL” = “sctp” ] && [ `checksctp` != “SCTP supported” ]
        echo “Error: SCTP is NOT supported on this machine”
        exit 1

# Check for ‘root’ permission
# ‘sysctl’ and ‘netstat’ needs ‘root’ permission to display more info

echo “Warning: ‘sodt’ needs ‘root’ permission to run smoothly”
# Get the system socket buffer data

sysctl -a | grep net.core > sodt.tmp 2>/dev/null
export DEFAULT_RECV_BUFFER=`cat sodt.tmp | grep net.core.rmem_default | cut -d”=” -f2 | tr -d ” “`
export DEFAULT_SEND_BUFFER=`cat sodt.tmp | grep net.core.wmem_default | cut -d”=” -f2 | tr -d ” “`
export MAX_RECV_BUFFER=`cat sodt.tmp | grep net.core.rmem_max | cut -d”=” -f2 | tr -d ” “`
export MAX_SEND_BUFFER=`cat sodt.tmp | grep net.core.wmem_max | cut -d”=” -f2 | tr -d ” “`
echo “sodt: OS default Socket recv buffer: $DEFAULT_RECV_BUFFER”
echo “sodt: OS default Socket send buffer: $DEFAULT_SEND_BUFFER”
echo “sodt: OS max Socket recv buffer: $MAX_RECV_BUFFER”
echo “sodt: OS max Socet send buffer: $MAX_SEND_BUFFER”

# While loop for real-time detection

echo “sodt: Detection starts”
while true
        netstat –$PROTOCOL -p | grep “$PRONAME” > sodt.tmp
        while read line
                RECV_Q=`echo $line | cut -d” ” -f2 | tr -d ” “`
                SEND_Q=`echo $line | cut -d” ” -f3 | tr -d ” “`
                if [ “$RECV_Q” -ge “$MAX_RECV_BUFFER” ] || [ “$SEND_Q” -ge “$MAX_SEND_BUFFER” ]
                        echo “`date`: $line”
        done < sodt.tmp
        sleep $SLEEPTIME

About daveti

Interested in kernel hacking, compilers, machine learning and guitars.
This entry was posted in Dave's Tools and tagged , , . Bookmark the permalink.

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