jfh@rpp386.cactus.org (John F. Haugh II) (03/02/90)
I added a Makefile and put the authors original comments in a README.
I also put conditional compilation statements around the BSD group
set code. You only get it if NGROUPS is defined.
I compiled it just fine on SCO Xenix [ which already has an id command,
but so what ... ]
--
#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create:
# README
# id.c
# Makefile
# This archive created: Fri Mar 2 07:51:42 1990
# By: John F. Haugh II (River Parishes Programming, Austin TX)
export PATH; PATH=/bin:/usr/bin:$PATH
if test -f 'README'
then
echo shar: "will not over-write existing file 'README'"
else
cat << \SHAR_EOF > 'README'
[ I added conditional compilation code for BSD, just in case someone
wasn't running BSD and wanted to use this. - John. ]
I saw a request somewhere for a program like the SysV id(1). I got used
to it under SunOS, and so I wrote this one to use on our BSD machines.
As far as I can tell, they act identically - though I can't check this,
since I do not have access to source. The only area they may differ is
if the user or group name can not be determined.
There is no man page - the program is very simple, it justs prints out
info on your real & effective user & group id, and your current group
access list. Example (mythical) outputs are:
uid=0(root) gid=0(wheel) groups=0(wheel),1(daemon)
uid=1074(alfie) gid=1(general) euid=1(daemon) groups=1(general)
To compile, no magic flags needed, just "cc -o id id.c".
SHAR_EOF
fi
if test -f 'id.c'
then
echo shar: "will not over-write existing file 'id.c'"
else
cat << \SHAR_EOF > 'id.c'
/* My own version of `id' for those systems that do not support it
* Displays uid, gid, euid, egid (if different to real), and groups
*
* Author: Nick Holloway <alfie@cs.warwick.ac.uk>
* Date: August 17th 1989
* Place: University of Warwick, Coventry, UK
*/
#ifdef __STDC__
extern struct passwd *getpwuid (uid_t);
extern struct group *getgrgid (gid_t);
#else
extern struct passwd *getpwuid();
extern struct group *getgrgid();
#endif
# include <stdio.h>
# include <sys/param.h>
# include <pwd.h>
# include <grp.h>
main ()
{
int uid, euid; /* real and effective user-id */
int gid, egid; /* real and effective group-id */
#ifdef NGROUPS
int ng, gidset [ NGROUPS ];/* current group access list */
#endif
int i; /* index var */
struct passwd *pwd; /* used to retrieve user name */
struct group *grp; /* used to retrieve group name */
/* --- collect information --- */
uid = getuid ();
gid = getgid ();
euid = geteuid ();
egid = getegid ();
#ifdef NGROUPS
ng = getgroups ( sizeof ( gidset ), gidset );
#endif
/* --- print real user-id --- */
(void) printf ( "uid=%d", uid );
if ( ( pwd = getpwuid ( uid ) ) != NULL )
(void) printf ( "(%s)", pwd->pw_name );
/* --- print real group-id --- */
(void) printf ( " gid=%d", gid );
if ( ( grp = getgrgid ( gid ) ) != NULL )
(void) printf ( "(%s)", grp->gr_name );
/* --- print effective user-id (if different to real) --- */
if ( euid != uid ) {
(void) printf ( " euid=%d", euid );
if ( ( pwd = getpwuid ( euid ) ) != NULL )
(void) printf ( "(%s)", pwd->pw_name );
}
/* --- print effective group-id (if different to real) --- */
if ( egid != gid ) {
(void) printf ( " egid=%d", egid );
if ( ( grp = getgrgid ( egid ) ) != NULL )
(void) printf ( "(%s)", grp->gr_name );
}
#ifdef NGROUPS
/* --- print current group access list --- */
if ( ng > 0 ) {
(void) fputs ( " groups=", stdout );
for ( i = 0; i < ng; i++ ) {
if ( i != 0 )
(void) putc ( ',', stdout );
(void) printf ( "%d", gidset [ i ] );
if ( ( grp = getgrgid ( gidset [ i ] ) ) != NULL )
(void) printf ( "(%s)", grp->gr_name );
}
}
#endif
(void) putc ( '\n', stdout );
}
SHAR_EOF
fi
if test -f 'Makefile'
then
echo shar: "will not over-write existing file 'Makefile'"
else
cat << \SHAR_EOF > 'Makefile'
SHELL = /bin/sh
FILES = README id.c Makefile
BINS = id
OBJS = id.o
SHAR = id.shar
BINDIR = /usr/local/bin
BINUID = bin
BINGID = bin
all: $(BINS)
install: all
cp $(BINS) $(BINDIR)
for FILE in $(BINS) ; do \
chmod 555 $(BINDIR)/$$FILE ;\
chgrp $(BINGID) $(BINDIR)/$$FILE ;\
chown $(BINUID) $(BINDIR)/$$FILE ;\
done
clean:
rm -f a.out core $(OBJS)
clobber: clean
rm -f $(BINS)
shar: $(FILES)
shar $(FILES) > $(SHAR)
SHAR_EOF
fi
exit 0
# End of shell archive
--
John F. Haugh II UUCP: ...!cs.utexas.edu!rpp386!jfh
Ma Bell: (512) 832-8832 Domain: jfh@rpp386.cactus.org