can't load the script

["Gary Lee" <gary@leahander.com>]

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Hi all,
 
I got the problem with my script.......every time I try to run my script,
the system will say command not found.....what's wrong?....How can I check
that I have all components installed for netfilter??....Here is my script:
 
#!/bin/sh
#
# rc.firewall-2.4-stronger
#
 

echo -e "\nLoading STRONGER rc.firewall - version $FWVER..\n"
 

#IPTABLES=/sbin/iptables
#IPTABLES=/usr/local/sbin/iptables
#
LSMOD=/sbin/lsmod
DEPMOD=/sbin/depmod
INSMOD=/sbin/insmod
GREP=/bin/grep
AWK=/bin/awk
SED=/bin/sed
IFCONFIG=/sbin/ifconfig
 
#
EXTIF="eth0"
INTIF="eth1"
echo "  External Interface:  $EXTIF"
echo "  Internal Interface:  $INTIF"
echo "  ---"
 

#
#EXTIP="`$IFCONFIG $EXTIF | $AWK \
 #/$EXTIF/'{next}//{split($0,a,":");split(a[2],a," ");print a[1];exit}'`"
 

#  STATIC IP addresses:
#
#  # out the EXTIP line above and un-# out the EXTIP line below
#
EXTIP="218.x.x.x"
echo "  External IP: $EXTIP"
echo "  ---"
 

# Assign the internal TCP/IP network and IP address
INTNET="10.126.0.0/24"
INTIP="10.126.0.63/24"
echo "  Internal Network: $INTNET"
echo "  Internal IP:      $INTIP"
echo "  ---"
 
# Setting a few other local variables
#
UNIVERSE="0.0.0.0/0"
 
# Some Servers
MAIL="203.x.x.x"
DNS1="210.x.x.x"
DNS2="210.x.x.x"
DNS3="218.x.x.x"
SERVER1="203.x.x.x"
 
# ports
UPORTS="1024:65535"
 

#======================================================================
 
echo "  - Verifying that all kernel modules are ok"
$DEPMOD -a
 
echo -en "    Loading kernel modules: "
 
# With the new IPTABLES code, the core MASQ functionality is now either
# modular or compiled into the kernel.  This HOWTO shows ALL IPTABLES
# options as MODULES.  If your kernel is compiled correctly, there is
# NO need to load the kernel modules manually.  
#
#  - Loaded manually to clean up kernel auto-loading timing issues
#
echo -en "ip_tables, "
#
#Verify the module isn't loaded.  If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_tables | $AWK {'print $1'} `" ]; then
   $INSMOD ip_tables
fi
 

#Load the IPTABLES filtering module - "iptable_filter" 
#
#  - Loaded automatically when filter policies are activated
 

#  - Loaded manually to clean up kernel auto-loading timing issues
#
echo -en "ip_conntrack, "
#
#
#
if [ -z "` $LSMOD | $GREP ip_conntrack | $AWK {'print $1'} `" ]; then
   $INSMOD ip_conntrack
fi
 

#Load the FTP tracking mechanism for full FTP tracking
#
# Enabled by default -- insert a "#" on the next line to deactivate
#
echo -e "ip_conntrack_ftp, "
#
#Verify the module isn't loaded.  If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_conntrack_ftp | $AWK {'print $1'} `" ]; then
   $INSMOD ip_conntrack_ftp
fi
 

#Load the IRC tracking mechanism for full IRC tracking
#
# Enabled by default -- insert a "#" on the next line to deactivate
#
echo -en "                             ip_conntrack_irc, "
#
#Verify the module isn't loaded.  If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_conntrack_irc | $AWK {'print $1'} `" ]; then
   $INSMOD ip_conntrack_irc
fi
 

#Load the general IPTABLES NAT code - "iptable_nat"
#  - Loaded automatically when MASQ functionality is turned on
# 
#  - Loaded manually to clean up kernel auto-loading timing issues
#
echo -en "iptable_nat, "
#
#Verify the module isn't loaded.  If it is, skip it
#
if [ -z "` $LSMOD | $GREP iptable_nat | $AWK {'print $1'} `" ]; then
   $INSMOD iptable_nat
fi
 

#Loads the FTP NAT functionality into the core IPTABLES code
# Required to support non-PASV FTP.
#
# Enabled by default -- insert a "#" on the next line to deactivate
#
echo -e "ip_nat_ftp"
#
#Verify the module isn't loaded.  If it is, skip it
#
if [ -z "` $LSMOD | $GREP ip_nat_ftp | $AWK {'print $1'} `" ]; then
   $INSMOD ip_nat_ftp
fi
 
echo "  ---"
 
 
 
#  Enable IP forwarding
#
#
echo "  Enabling forwarding.."
echo 1 > /proc/sys/net/ipv4/ip_forward
 
 
 
############################################################################
#
#
# Enable Stronger IP forwarding and Masquerading
#
 
#Clearing any previous configuration
#
 
echo "  Clearing any existing rules and setting default policy to DROP.."
iptables -P INPUT DROP  
iptables -F INPUT 
iptables -P OUTPUT DROP  
iptables -F OUTPUT 
iptables -P FORWARD DROP  
iptables -F FORWARD 
iptables -F -t nat
 
#Not needed and it will only load the unneeded kernel module
#iptables -F -t mangle
#
# Flush the user chain.. if it exists
if [ -n "`iptables -L | $GREP drop-and-log-it`" ]; then
   iptables -F drop-and-log-it
fi
#
# Delete all User-specified chains
iptables -X
#
# Reset all IPTABLES counters
iptables -Z
 

#Configuring specific CHAINS for later use in the ruleset
#
 
echo "  Creating a DROP chain.."
iptables -N drop-and-log-it
iptables -A drop-and-log-it -j LOG --log-level info 
iptables -A drop-and-log-it -j DROP
 
echo -e "\n   - Loading INPUT rulesets"
 

#######################################################################
# INPUT: Incoming traffic from various interfaces.  All rulesets are 
#        already flushed and set to a default policy of DROP. 
#
 
# loopback interfaces are valid.
#
iptables -A INPUT -i lo -s $UNIVERSE -d $UNIVERSE -j ACCEPT
 

# local interface, local machines, going anywhere is valid
#
iptables -A INPUT -i $INTIF -s $INTNET -d $UNIVERSE -j ACCEPT
 

# remote interface, claiming to be local machines, IP spoofing, get lost
#
iptables -A INPUT -i $EXTIF -s $INTNET -d $UNIVERSE -j drop-and-log-it
 

# external interface, from any source, for ICMP traffic is valid
#
#  If you would like your machine to "ping" from the Internet, 
#  enable this next line
#
#iptables -A INPUT -i $EXTIF -p ICMP -s $UNIVERSE -d $EXTIP -j ACCEPT
 

# remote interface, any source, going to permanent PPP address is valid
#
#iptables -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -j ACCEPT
 

# Allow any related traffic coming back to the MASQ server in
#
iptables -A INPUT -i $EXTIF -s $UNIVERSE -d $EXTIP -m state --state \
 ESTABLISHED,RELATED -j ACCEPT
 
# HTTPd - Enable the following lines if you run an EXTERNAL WWW server
#
#echo -e "      - Allowing EXTERNAL access to the WWW server"
iptables -A INPUT -i $EXTIF -m state --state NEW,ESTABLISHED,RELATED \
 -p tcp -s $UNIVERSE -d $EXTIP --dport 80 -j ACCEPT
 
# SSH - Enable the SSH connection
iptables -A INPUT -i $EXTIF -m state --state NEW,ESTABLISHED,RELATED \ 
 -p tcp -s $UNIVERSE -d $EXTIP --dport 22 -j ACCEPT
 
# VNC connection
iptables -A INPUT -i $EXTIF -m state --state NEW,ESTABLISHED,RELATED \
 -p tcp -s $UNIVERSE -d $EXTIP --dport 5900 -j ACCEPT
 
# DNS 
iptables -A INPUT -i $EXTIF -m state --state NEW -p udp -s $DNS1 --sport 53
\
 -d $EXTIP --dport 53 -j ACCEPT
iptables -A INPUT -i $EXTIF -m state --state NEW -p tcp ! --syn -s DNS1 \
 --sport 53 -d $EXTIP --dport 53 -j ACCEPT
iptables -A INPUT -i $EXTIF -m state --state NEW -p udp -s $DNS2 --sport 53
\
 -d $EXTIP --dport 53 -j ACCEPT
iptables -A INPUT -i $EXTIF -m state --state NEW -p tcp ! --syn -s DNS2 \
 --sport 53 -d $EXTIP --dport 53 -j ACCEPT
iptables -A INPUT -i $EXTIF -m state --state NEW -p udp -s $DNS3 --sport 53
\
 -d $EXTIP --dport 53 -j ACCEPT
iptables -A INPUT -i $EXTIF -m state --state NEW -p tcp ! --syn -s DNS3 \
 --sport 53 -d $EXTIP --dport 53 -j ACCEPT
 
# SUNRPC
iptables -A INPUT -i $EXTIF -m state --state NEW,ESTABLISHED,RELATED \
 -p tcp -s $SERVER1 -d $EXTIP --dport 111 -j ACCEPT
iptables -A INPUT -i $EXTIF -m state --state NEW,ESTABLISHED,RELATED \
 -p udp -s $SERVER1 -d $EXTIP --dport 111 -j ACCEPT
 
#
# ----- End OPTIONAL Section -----
 
 
 
# Catch all rule, all other incoming is denied and logged. 
#
iptables -A INPUT -s $UNIVERSE -d $UNIVERSE -j drop-and-log-it
 

echo -e "   - Loading OUTPUT rulesets"
 
#######################################################################
# OUTPUT: Outgoing traffic from various interfaces.  All rulesets are 
#         already flushed and set to a default policy of DROP. 
#
 
# loopback interface is valid.
#
iptables -A OUTPUT -o lo -s $UNIVERSE -d $UNIVERSE -j ACCEPT
 

# local interfaces, any source going to local net is valid
#
iptables -A OUTPUT -o $INTIF -s $EXTIP -d $INTNET -j ACCEPT
 

# local interface, any source going to local net is valid
#
iptables -A OUTPUT -o $INTIF -s $INTIP -d $INTNET -j ACCEPT
 

# outgoing to local net on remote interface, stuffed routing, deny
#
iptables -A OUTPUT -o $EXTIF -s $UNIVERSE -d $INTNET -j drop-and-log-it
 

# anything else outgoing on remote interface is valid
#
iptables -A OUTPUT -o $EXTIF -s $EXTIP -d $UNIVERSE -j ACCEPT
 

# ----- Begin OPTIONAL Section -----
#
 
# DHCPd - Enable the following lines if you run an INTERNAL DHCPd server
#         - Remove BOTH #s all the #s if you need this functionality.
#
#iptables -A OUTPUT -o $INTIF -p tcp -s $INTIP --sport 67 \
# -d 255.255.255.255 --dport 68 -j ACCEPT
#iptables -A OUTPUT -o $INTIF -p udp -s $INTIP --sport 67 \
# -d 255.255.255.255 --dport 68 -j ACCEPT
 
# HTTP
iptables -A OUTPUT -o $EXTIF -m state --state NEW -p tcp -s $EXTIP \
 --sport $UPORTS --dport 80 -j ACCEPT
 
# DNS
iptables -A OUTPUT -o $EXTIF -p udp -s $EXTIP --sport $UPORTS -d $DNS1 \
 --dport 53 -j ACCEPT
iptables -A OUTPUT -o $EXTIF -p udp -s $EXTIP --sport $UPORTS -d $DNS2 \
 --dport 53 -j ACCEPT
iptables -A OUTPUT -o $EXTIF -p tcp -s $EXTIP --sport $UPORTS -d $DNS1 \
 --dport 53 -j ACCEPT
iptables -A OUTPUT -o $EXTIF -p tcp -s $EXTIP --sport $UPORTS -d $DNS2 \
 --dport 53 -j ACCEPT
iptables -A OUTPUT -o $EXTIF -p udp -s $EXTIP --sport $UPORTS -d $DNS3 \
 --dport 53 -j ACCEPT
iptables -A OUTPUT -o $EXTIF -p tcp -s $EXTIP --sport $UPORTS -d $DNS3 \
 --dport 53 -j ACCEPT
 
# VNC
iptables -A OUTPUT -o $EXTIF -m state --state NEW -p tcp -s $EXTIP \
 --sport $UPORTS --dport 5900 -j ACCEPT
 
# SUNRPC
iptables -A OUTPUT -o $EXTIF -p tcp -s $EXTIP -d $UNIVERSE --dport 111 -j
ACCEPT
iptables -A OUTPUT -o $EXTIF -p udp -s $EXTIP -d $UNIVERSE --dport 111 -j
ACCEPT
 
#
# ----- End OPTIONAL Section -----
 
# Catch all rule, all other outgoing is denied and logged. 
#
iptables -A OUTPUT -s $UNIVERSE -d $UNIVERSE -j drop-and-log-it
 

echo -e "   - Loading FORWARD rulesets"
 
#######################################################################
# FORWARD: Enable Forwarding and thus IPMASQ
#
 
echo "     - FWD: Allow all connections OUT and only existing/related IN"
iptables -A FORWARD -i $EXTIF -o $INTIF -m state --state ESTABLISHED,RELATED
\
 -j ACCEPT
iptables -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT
 
# Catch all rule, all other forwarding is denied and logged. 
#
iptables -A FORWARD -j drop-and-log-it
 

echo "     - NAT: Enabling SNAT (MASQUERADE) functionality on $EXTIF"
#
#More liberal form
#iptables -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE
#
#Stricter form
iptables -t nat -A POSTROUTING -o $EXTIF -j SNAT --to $EXTIP
 

#######################################################################
 

echo -e "\nDone.\n"
 
 
 
Best regards,
Gary Lee
 
 

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