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- From: terry@cs.weber.edu (A Wizard of Earth C)
- Subject: Re: getnetmaskent()?
- Message-ID: <1992Sep5.005848.3022@fcom.cc.utah.edu>
- Sender: news@fcom.cc.utah.edu
- Organization: Weber State University (Ogden, UT)
- References: <BOB.92Sep4120430@volitans.MorningStar.Com>
- Date: Sat, 5 Sep 92 00:58:48 GMT
- Lines: 32
-
- In article <BOB.92Sep4120430@volitans.MorningStar.Com> bob@MorningStar.Com (Bob Sutterfield) writes:
- >BSD's getnetent() family of routines works with the contents of
- >/etc/networks. Is there a similar getnetmaskent() family for the
- >information contained in /etc/netmasks? I note that the Tahoe (or is
- >it Reno?) <netdb.h> has no mention of a subnet mask, nor of a file
- >where it might be found.
- >
- >Must I actually open() the file and parse it myself? How barbaric! :-)
-
- Actually, you need to look at the sources for ifconfig, which is capable
- of printing out the netmask. The netmask is an artifact of the paramters
- to ifconfig initially, not an artifact of some attribute of your host
- address. This is especially true if you are subnetting some class of
- subnet... for instance, 137.190.16.x as a subnet of the class B network
- 137.190.x.x.
-
- One thing I generally do, but upon which you wouldn't be able to rely, is
- to make a /etc/hosts entry for the netmask based on the network name. Then
- you can gethostent() it.
-
-
- Terry Lambert
- terry_lambert@gateway.novell.com
- terry@icarus.weber.edu
- ---
- Any opinions in this posting are my own and not those of my present
- or previous employers.
- --
- -------------------------------------------------------------------------------
- terry@icarus.weber.edu
- "I have an 8 user poetic license" - me
- -------------------------------------------------------------------------------
-