Dynamic IP Hack
I have an RH7 Linux box into a large WinNT LAN.
All that WinNT servers gives me is a dynamic IP
address.
Before you can do anything else please save your
original /etc/hosts file.
This is how you can hack that IP and put it in your
/etc/hosts file.
The testip.c program read the IP address from ifconfig
command and write it
into the /etc/hosts-up file.
I am newbie to Linuc c programming so don't laugh on
me for this C source file.
Compile: gcc setdynip.c -o setdynip
/* setdynip.c */
/* Written by Bubulac Angela Tatiana
([EMAIL PROTECTED],
[EMAIL PROTECTED] Copyright 20001, author
releases this source freely, allowing copying and
modification, so long as the original copyright notice
is maintained*/
#include <stdio.h>
int main(void)
{
FILE *fin,
*popen();
char line[80],
ipaddr[16],
host_domain[]="deltacom.romtelecom.ro
deltacom";
if ((fin = popen("ifconfig", "r")) != NULL)
while (fgets(line,80,fin) != NULL)
if (sscanf(line, "eth0 %s", ipaddr))
{
fgets(line,80,fin);
sscanf(line, " inet addr:
%15s", ipaddr);
}
fclose(fin);
if ((fin = fopen("/etc/hosts-up", "w")) == NULL)
{
fprintf(stderr, "Error in opening output file.
\n");
exit(1);
}
fprintf(fin, "%s\n", "127.0.0.1 localhost");
fprintf(fin, "%s %s\n", ipaddr, host_domain);
fclose(fin);
return(0);
}
The resulting hosts-up file is:
127.0.0.1 localhost
172.20.64.102 deltacom.romtelecom.ro deltacom
hosts-down file
127.0.0.1 deltacom.romtelecom.ro localhost
deltacom
Put testip and hosts-up file in /sbin/ifup script
ifup script
......
echo -n "Determining IP information for
${DEVICE}..."
if /sbin/pump ${PUMPARGS} -i ${DEVICE} -h deltacom
; then
echo " done. "
echo "/sbin/pump -i ${DEVICE} --status"
elif /sbin/dhcpcd ${DHCPCDARGS} ${DEVICE} ; then
echo " done."
else
echo " failed."
exit 1
fi
echo "Testing IP ....."
if [ ! -f /usr/sbin/setdynip ]; then
echo " testip file doesn't exist!"
exit 0
fi
setdynip
cp /etc/hosts-up /etc/hosts
else
.........
Put hosts-down file to /sbin/ifdown script.
ifdown script
At the end of this script put
cp /etc/hosts-down /etc/hosts
Then type /etc/init.d/.network restart or reboot the
computer.
This work for me.
=====
Eng. Bubulac Angela Tatiana
IT Department, Romtelecom
Phone: 4002804
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