Date: Tue, 11 Feb 1997 20:57:41 +0000 From: Brian Somers <brian@awfulhak.demon.co.uk> To: "Joseph D. Orthoefer" <j_orthoefer@tia.net> Cc: hackers@FreeBSD.ORG Subject: Re: Modifcation to user mode ppp Message-ID: <199702112057.UAA12501@awfulhak.demon.co.uk> In-Reply-To: Your message of "Mon, 10 Feb 1997 19:45:13 EST." <Pine.BSF.3.95.970210191647.23696B-100000@mailbox.tia.net>
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> I've added a few lines of code to modem.c to allow user mode ppp to start
> up a shell hanging off a pty (using forkpty() from libutil), and to use
> the master half of the pty as its modem device, this allows me to use the
> "term" command whilst running ppp and establish an 8 bit clean connection,
> like rsh or secure shell, and utilize ppp over that. Right now I have it
> execle'ing /usr/bin/login instead of /bin/sh since, for some reason,
> simply setuid()'ing the forked child back to a normal user right before
> exec'ing a shell results in the shell not working. Not setuid()'ing
> before execing results in a root shell.
>
> Here's the bit I can't get to work if I just have it exec a sh.
>
> OpenPtyChild()
> {
> int fdm;
> pid_t pid;
> char slave_name[20];
>
> fdm = NULL;
> pid = forkpty(&fdm, slave_name, NULL, NULL);
> if (pid == 0) { /* child */
> /* why don't I work */
> setreuid(getuid,getuid);
> execle("/bin/sh", "sh", "-i", NULL);
> }
> return(fdm);
> }
>
> Plus two or three lines down in OpenModem() (in modem.c) to get it
> to recognize "pty" as a device type, and call the previous function.
>
>
I suspect the problem is that getuid is a function....
Why is all this necessary ? Are you trying to do something smarter than
chat can handle ?
--
Brian <brian@awfulhak.demon.co.uk>, <brian@freebsd.org>
<http://www.awfulhak.demon.co.uk/>;
Don't _EVER_ lose your sense of humour....
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