Merge with Cygnus sources, changes from Mark Eichin, Marc Horowitz, Chris

Merge ... Cygnus sources, changes from Mark Eichin, Marc Horowitz, Chris
Provenzano and me:

* Makefile.in (install): Install correct set of man pages, and check for
failures.
* kshd.M, klogind.M: Renamed from kr*.M versions.
* login.M: New file. Man page for login with some description of new features.

* rlogin.M: Remove references to using program with target hostname as argv[0].
* rsh.M: Ditto.  Also document -f, -F, -x options.

* login.c: Massive changes.  Split much functionality out of main and into
separate file sections: terminal flag settings, Kerberos 4 and 5 support, UNIX
password support, mail check, signal handler handling, some other support
routines.  Revamp controlling tty and process group handling.  For AFS
configuration, use setpag and run aklog.  Try validating password using krb5.
Always set tty flags, not just for rlogin session.  When validating tickets,
treat an existing key file that doesn't contain the key we think we want
(possibly because DNS was spoofed) as an error condition.
* Makefile.in (LOGINLIBS): List libkrb524.a here.
(LIBOBJS): Not here.
(login.krb5): Reverse the order of LIBOBJS and LOGINLIBS.
* configure.in: Check for --with-afs.  Add AFS libs and define SETPAG if
supplied.

* login.c (KRB5_GET_TICKETS, KRB4_GET_TICKETS, KRB_RUN_AKLOG): new macros
selecting single signon options.  krb5.conf profile support for control over
authentication options, above the compile time selection.
(conf_affirmative): new function, recognize yes/no in profile value.
(login_get_kconf): new function, look for all [login] flags and set them in
appropriate globals (via login_conf_set array.)
(main, sleepexit, destroy_tickets): Check the new login_* flags.
(main): rename KRB4_USE_524 to KRB4_CONVERT.

* configure.in: Added checks for tcsetpgrp, tcgetpgrp, setpgid.
* krlogind.c (control): Use tcgetpgrp if it's available.

* loginpaths.h (RPATH, LPATH, LPATH_root): Define HP/UX 9.04 versions,
conditionalized on __hpux and !hpux.

* login.c and configure.in: instead of checking _IBMR2 and __sgi__, write
configure tests to check for the existence of /etc/environment and
/etc/TIMEZONE files, respectively.

* forward.c (rd_and_store_for_creds) : If chown fails then only pass failure
back if owner is different than intended owner. This is to make rsh.exp test
work without requiring root privlidges.

* login.c (main): Don't set TERM to an empty value.
(stypeof) [__hpux]: Return null if unknown.

* krlogin.c (catchild): remove hp/ux kludge because of aclocal.m4 fix.
(speeds): test __hpux for hpux speed list.
(main): test __hpux for use of FIOSSAIOSTAT and FIOSSAIOOWN
(USE_TERMIO): test __hpux for bsdtty/ptyio headers.
* krlogind.c: test __hpux for bsdtty/ptyio headers.
(doit): test __hpux for use of setpgrp2.
* krcp.c (main): test __hpux as well for remsh vs. rsh.

* krcp.c (des_write): Make sure the buffer for the encrypted data is large
enough. Only return an error in malloc fails.

* krsh.c (main): Always turn on anyport -A option.

* krlogind.c (ptsname): Declare if it's going to be used.

* krshd.c (main): Use basename of argv[0] for progname.

* login.c (dofork): On linux, TIOCNOTTY causes us to die on a SIGHUP, so don't
even try it.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@7881 dc483132-0cff-0310-8789-dd5450dbe970