Explain some of the more obscure logic, or where we deviate from
what the original awk code did. Also, give a count of the usable
addresses on the subnet.
Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
This is useful if you later need to perform numeric range-checking
on addresses, i.e. to see if an address falls inside a CIDR range,
etc. and what interface it corresponds to.
Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
dnmasq.init now invokes ipcalc.sh as either:
ipcalc.sh address/netmask ...
or:
ipcalc.sh address/prefix
but the existing version doesn't accept the 2nd notation. We're
trying to rationalize the usage of ipcalc.sh, and here we add
support for the 2nd format.
Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
The previous code handling the equal-condition might be removed or
altered in the future and the case might be overlooked.
Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
Some users have their routers configured to supply a DHCP range that
includes the local interface address.
That worked with dnsmasq because it automatically skips the local
address.
Re-enable those existing configurations for the release and hint at
possible future problems.
Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
[ wrap commit description and remove unecessary text ]
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
To avoid confusion when working with ipcalc.sh, clarify that the last two
parameters belong to the range calculation and rename 'num' to the slightly
less ambiguous 'size'.
Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
Printing a broadcast address doesn't make any sense for /31 and /32
prefixes.
Strictly speaking, the same goes for the network address but it is useful
to get the first address in the prefix, e.g. to create a canonical
CIDR notation "$NETWORK/$PREFIX".
Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
For /31 and /32 prefixes, there are only host addresses - no network and
broadcast address with all-zero and all-one bits.
Reflect this when setting the limit.
Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
The start and end addresses are inclusive.
Thus, adding num without substracting one results in num + 1 addresses.
Add the substraction and to implement the documented behaviour.
Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
There's hardly an shell logic in ipcalc.sh and a $* that would garble
parameter positions.
Move the awk invokation to the shebang.
A rename from "ipcalc.sh" to "ipcalc" is desirable but could prove tricky
with packages in other repositories depending on the filename.
Signed-off-by: Leon M. George <leon@georgemail.eu>
It's possible to move range boundaries in a way that the start address
lies behind the end address.
Detect this condition and exit with an error message.
Signed-off-by: Leon M. George <leon@georgemail.eu>
With this patch, ipcalc only calculates range boundaries if the
corresponding parameters are supplied.
Signed-off-by: Leon M. George <leon@georgemail.eu>
Calculate complements by using awk's xor() function with a mask of 0xffffffff
instead of relying on the compl() function which appears to produce broken
results on certain 64bit architectures.
SVN-Revision: 34875
the attached patch makes ipcalc.sh accept IP/Netmask combinations in
CIDR notation. Before you could only do:
# sh ipcalc.sh 192.168.0.0 255.255.255.0 1 10
IP=192.168.0.0
NETMASK=255.255.255.0
BROADCAST=192.168.0.255
NETWORK=192.168.0.0
PREFIX=24
START=192.168.0.1
END=192.168.0.11
with this patch you can also execute it with:
sh ipcalc.sh 192.168.0.0/24 1 10
IP=192.168.0.0
NETMASK=255.255.255.0
BROADCAST=192.168.0.255
NETWORK=192.168.0.0
PREFIX=24
START=192.168.0.1
END=192.168.0.11
The patch is based on #1260 [1], i just changed one line to calculate
the START end END ips right. I wonder why that never got included. If
there is no reason not to do i would like to ask you to commit that
patch, because its a functionality i (and probably others) miss quite often.
Btw, i also fixed 4 useless tabs, that might look a bit strange in the
patch.
Regards, Manuel
SVN-Revision: 26930
