Date: Wed, 15 Nov 2000 19:26:25 -0800 From: "Renaud Waldura" <renaud@waldura.com> To: "Brian Somers" <brian@Awfulhak.org> Cc: <hackers@FreeBSD.ORG> Subject: Re: PPPoE w/ nat auto fragmentation hack? (use tcpmssd port) Message-ID: <002a01c04f7d$00699680$0402010a@biohz.net> References: <200011160032.eAG0Ws526758@hak.lan.Awfulhak.org>
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> ppp will run programs as the user id that invoked ppp rather than > using the effective user id (ie, it runs things as *you*, not *root*). Mmm-mmh. In my case, since ppp is started at boot time, the only user that ever invokes it is root, hence the tcpmssd thingy is run as root. As confirmed by the multiple "ps" I ran: euid == ruid == svguid == 0. > A good ``first step'' is to run > ! sh -c "/usr/local/bin/tcpmssd -p 12345 -i INTERFACE >/tmp/log 2>&1" > so that you can get to see any error messages - ppp redirects I/O to Yup, tried that, here's what I get: ******************** start *************** Wed Nov 15 13:30:12 PST 2000 id says: uid=0(root) gid=0(wheel) groups=0(wheel) HOME=/ PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin 01001 divert 1234 tcp from any to any out xmit tun0 setup The rule gets inserted, tcpmssd runs as root, and I feel like a dummy. Any other ideas? Thanks for the help Brian, --Renaud ----- Original Message ----- From: Brian Somers <brian@Awfulhak.org> To: Renaud Waldura <renaud@waldura.com> Cc: Brian Somers <brian@Awfulhak.org>; <hackers@FreeBSD.ORG>; <brian@Awfulhak.org> Sent: Wednesday, November 15, 2000 4:32 PM Subject: Re: PPPoE w/ nat auto fragmentation hack? (use tcpmssd port) > > Maybe I'm just being boneheaded, but... > > > > > ! sudo ipfw add 40000 divert 12345 all from any to any via INTERFACE > > > ! sudo /usr/local/bin/tcpmssd -p 12345 -i INTERFACE > > > > I was under the (tested & confirmed) impression that programs executed by > > ppp are run under uid 0. Eg. I don't use "sudo" but the ipfw rule is added > > anyway, and tcpmssd is run as root. > > > > But maybe a sudo environment brings something else? That could explain a lot > > right there. > > > > --Renaud > > ppp will run programs as the user id that invoked ppp rather than > using the effective user id (ie, it runs things as *you*, not *root*). > > AFAIK, sudo will not muck about with your environment.... > > A good ``first step'' is to run > > ! sh -c "/usr/local/bin/tcpmssd -p 12345 -i INTERFACE >/tmp/log 2>&1" > > so that you can get to see any error messages - ppp redirects I/O to > /dev/null by default. > > -- > Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org> > <http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org> > Don't _EVER_ lose your sense of humour ! > > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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