Date: Mon, 3 Jan 2005 22:22:47 -0600 From: Eric F Crist <ecrist@secure-computing.net> To: Timothy Luoma <lists@tntluoma.com> Cc: FreeBSD-Questions Questions <freebsd-questions@freebsd.org> Subject: Re: my lame attempt at a shell script... Message-ID: <49F924A2-5E08-11D9-B56F-000D9333E43C@secure-computing.net> In-Reply-To: <491556AE-5DF7-11D9-89A5-000D93AD26C8@tntluoma.com> References: <06DDB71C-5DB4-11D9-B56F-000D9333E43C@secure-computing.net> <15416223037.20050103193803@hexren.net> <6074EB8D-5DC6-11D9-89A5-000D93AD26C8@tntluoma.com> <F0BE3E23-5DC8-11D9-B56F-000D9333E43C@secure-computing.net> <41D9BA53.4060105@locolomo.org> <2DF07A46-5DD2-11D9-89A5-000D93AD26C8@tntluoma.com> <D7D0CFB3-5DD5-11D9-B56F-000D9333E43C@secure-computing.net> <3E8DD18E8557227C2A3C8E5A@utd49554.utdallas.edu> <AB283AB4-5DD9-11D9-B56F-000D9333E43C@secure-computing.net> <7C6BEBEDE2DB4AC7E55D6843@utd49554.utdallas.edu> <3D1AE682-5DDF-11D9-B56F-000D9333E43C@secure-computing.net> <491556AE-5DF7-11D9-89A5-000D93AD26C8@tntluoma.com>
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--Apple-Mail-16--196167366 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; format=flowed On Jan 3, 2005, at 8:21 PM, Timothy Luoma wrote: > > On Jan 3, 2005, at 6:28 PM, Eric F Crist wrote: > >> A couple more questions, then I'm done. Promise. >> >> I need to verify whether or not there is an entry for >> grog_firewall_oif >> and grog_firewall_iif in /etc/rc.conf. If not, I want to exit with an >> error. > > You want to check for either "grog_firewall_oif" or > "grog_firewall_iif" in /etc/rc.conf > > egrep -v "^#" /etc/rc.conf |\ > egrep -q "grog_firewall_oif | grog_firewall_iif" || (echo "$0" ; exit > 1) > > The first line says "skips the comment lines" (the ones that begin > with #) > What does the second line do? I tried, apparently, to accomplish the same thing with some different syntax, yet unsuccessfully. >> Also, a little more advanced, I need to pull information from an >> ifconfig output. I need to pull network numbers for both the internal >> interface, as well as external interface. For example, >> >> vr0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 >> inet 192.168.1.5 netmask 0xffffff00 broadcast 192.168.1.255 >> inet6 fe80::20e:a6ff:feb9:2d3d%vr0 prefixlen 64 scopeid 0x3 >> ether 00:0e:a6:b9:2d:3d >> media: Ethernet autoselect (100baseTX <full-duplex>) >> status: active >> >> I don't actually need my own address, I need to be able to figure out >> that the system, based on the above output, is on the 192.168.1.0/24 >> network. This will be input into my firewall rulesets. >> >> I imagine that there's a util or command around that can do this, or I >> can code out the math, but there's got to be an easier way. > > How much can you assume? Will you know the interface? If so it's > fairly easy > > ifconfig vr0 |\ > tr '\012' ' ' |\ > sed 's#.*inet ##; s# netmask.*##' > > roughly translated: > line 1: give me the information for vr0 only > line 2: replace the end of line (\012) and replace them with a space > line 3: delete everything from the beginning of the line up to "inet " > and then delete everything from " netmask" to the end of the line > > Put it into a variable > > MY_IP=`ifconfig vr0 |\ > tr '\012' ' ' |\ > sed 's#.*inet ##; s# netmask.*##'` > > TjL I can assume everything, since grog_firewall_oif *should* be a value such as above. On my system, grog_firewall_oif will be ath0. This isn't assumed, but rather defined for me. I would write the above line as follows (please verify syntax): ifconfig $grog_firewall_oif |\ tr '\012' ' ' |\ sed 's#.*inet ##; s# netmask.*##' oif_ip=`ifconfig $grog_firewall_oif |\ tr '\012' ' ' |\ sed 's#.*inet ##; s# netmask.*##'` This is a lot of help, however, if you read: >> I don't actually need my own address, I need to be able to figure out >> that the system, based on the above output, is on the 192.168.1.0/24 >> network. I need my NETWORK address, in this case 192.168.1.0 (with netmask), which would be 192.168.1.0/24 Thanks. _______________________________________________________ Eric F Crist "I am so smart, S.M.R.T!" Secure Computing Networks -Homer J Simpson --Apple-Mail-16--196167366 content-type: application/pgp-signature; x-mac-type=70674453; name=PGP.sig content-description: This is a digitally signed message part content-disposition: inline; filename=PGP.sig content-transfer-encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (Darwin) iEYEARECAAYFAkHaGhgACgkQRAAY9knOW+ppfQCeMfx2z1KKQnI1vwZ2HJF1i3NJ tzYAmgJS24XOyY8DUNb+QPessYjoTqVX =Ta04 -----END PGP SIGNATURE----- --Apple-Mail-16--196167366--
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