SCO 'su' replacement

[Eamonn McManus]

On 11th April I reposted our replacement su for SCO Unix.  I am grateful
to Jan-Piet Mens for pointing out that it did not successfully set the
login-uid (which is its main raison d'etre) on 3.2.2, and for helping me
try out replacements.  This patch produces a version that works properly
on both 3.2.0 and 3.2.2.

,
Eamonn

*** /tmp/,RCSt1a18137	Mon Apr 29 20:49:01 1991
--- oksetluid.c	Mon Apr 29 20:44:57 1991
***************
*** 9,15 ****
  
  #ifndef lint
  static const char rcsid[] =
! 	"$Id: oksetluid.c,v 1.1 90/09/28 16:21:11 em Release $";
  #endif
  
  #include <fcntl.h>
--- 9,15 ----
  
  #ifndef lint
  static const char rcsid[] =
! 	"$Id: oksetluid.c,v 1.2 91/04/29 20:44:21 em Release $";
  #endif
  
  #include <fcntl.h>
***************
*** 34,40 ****
   struct security_info *secp;
   long secpaddr;
   int fd, i;
!  char *err=0;
   if (!setluid(id)) return 0;
   uxnlist(nlsym);
   if (!(secpaddr = nlsym[0].n_value) )
--- 34,40 ----
   struct security_info *secp;
   long secpaddr;
   int fd, i;
!  char *err=0, zero=0;
   if (!setluid(id)) return 0;
   uxnlist(nlsym);
   if (!(secpaddr = nlsym[0].n_value) )
***************
*** 48,58 ****
   else	{
  	 /* Stupid definition of offsetof() in <stddef.h> produces warning from
  	    Microsoft compiler. */
! 	 i = (long) secp + offsetof(struct security_info, si_luid);
  	 if (lseek(fd, (long) i, 0) != i)
  		 err = "Can't seek to info in /dev/kmem";
! 	 else if (write(fd, &id, sizeof(id)) != sizeof(id))
! 		 err = "Can't write luid to /dev/kmem";
  	}
   close(fd);
   return err;
--- 48,60 ----
   else	{
  	 /* Stupid definition of offsetof() in <stddef.h> produces warning from
  	    Microsoft compiler. */
! 	 i = (long) secp + offsetof(struct security_info, si_luid_set);
  	 if (lseek(fd, (long) i, 0) != i)
  		 err = "Can't seek to info in /dev/kmem";
! 	 else if (write(fd, &zero, sizeof(zero)) != sizeof(zero))
! 		 err = "Can't write luid_set to /dev/kmem";
! 	 else if (setluid(id) < 0)
! 		 err = "Setluid failed";
  	}
   close(fd);
   return err;
*** /tmp/,RCSt1a18137	Mon Apr 29 20:49:04 1991
--- su.c	Mon Apr 29 20:45:18 1991
***************
*** 29,35 ****
  
  #ifndef lint
  static const char rcsid[] =
! 	"$Id: su.c,v 1.1 90/09/28 16:22:21 em Release $";
  #endif
  
  #ifndef SecureWare
--- 29,35 ----
  
  #ifndef lint
  static const char rcsid[] =
! 	"$Id: su.c,v 1.2 91/04/29 20:44:58 em Release $";
  #endif
  
  #ifndef SecureWare
***************
*** 261,267 ****
      if (islogin && chdir(pwd->pw_dir) < 0)
  	perror(pwd->pw_dir);	/* But su anyway. */
      execv(shell, shargs);
!     crash("execl", shell);
  }
  
  
--- 261,267 ----
      if (islogin && chdir(pwd->pw_dir) < 0)
  	perror(pwd->pw_dir);	/* But su anyway. */
      execv(shell, shargs);
!     crash("execv", shell);
  }