v13i034: Programs to retrieve /etc/passwd info
Rich Salz
rsalz at bbn.com
Fri Feb 12 00:42:24 AEST 1988
Submitted-by: Michael Saboff <hplabs!hpirs!mike>
Posting-number: Volume 13, Issue 34
Archive-name: pwget
[ This is a small utility to get information from the password file.
Programs (like rn stuff :-) that might other do grep or ypmatch
can use this instead. --r$ ]
Michael Saboff
hplabs!hpda!mike
Phone: (408) 447-5976
# This is a shell archive. Remove anything before this line,
# then unpack it by saving it in a file and typing "sh file".
# This archive contains:
# README Makefile pwget.1 pwget.c
LANG=""; export LANG
echo x - README
cat >README <<'@EOF'
---NOTICE---
This is code is available to the public free of charge.
Hewlett-Packard Company asks that it be given author recognition.
The information in this document is subject to change without notice.
THIS MATERIAL IS PROVIDED "AS IS". HEWLETT-PACKARD MAKES NO WARRANTY OF
ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
Hewlett-Packard shall not be liable for errors contained herein or for
incidental or consequential damages or for any claim of any kind in
connection with the furnishing, performance or use of this material.
Hewlett-Packard assumes no responsibility for the use, reliability, or
support of this software.
---END OF NOTICE---
These utilities provided a common command level access to /etc/group and
/etc/passwd much in the same way as getgrent(), getpwent(), et al.
This is especially useful if your system is running NFS and Yellow Pages.
With Yellow pages, there is no easy command level interface for this
information that will give you the same results as the libc routines.
These routines use "getopt()" so make sure your system has it.
Edit the Makefile for your machine/os and for the owner, group, mode
and destination of the binary and the man page.
Install with: make install.
File list:
README - This file.
Makefile - Makefile.
pwget.1 - Man Page.
pwget.c - Command source.
@EOF
chmod 664 README
echo x - Makefile
cat >Makefile <<'@EOF'
# Configure CFLAGS/LDFLAGS for your machine/OS
# for HP-UX and other Sys V systems:
CFLAGS= -O -DSYSV
# for VAX 4.[23] BSD, SunOS and other BSD based systems:
# CFLAGS= -O -DBSD
# Need getopt for pwget, include library that has it.
# System V based system (like HP-UX), 4.3BSD and SunOS have null LDFLAGS.
LDFLAGS=
# 4.2BSD requires getopt from someplace.
# LDFLAGS= -lgetopt
MODE=755
OWNER=bin
GROUP=bin
DEST=dest
MANMODE=444
MANOWNER=bin
MANGROUP=bin
MANDEST=man
all: grget pwget pwget.cat
install: installcmd installman
installcmd: pwget
strip pwget
# use install for BSD and cpset for SYSV
# install -c -o $(OWNER) -g $(GROUP) -m $(MODE) pwget $(DEST)
cpset pwget $(DEST) $(MODE) $(OWNER) $(GROUP)
ln $(DEST)/pwget $(DEST)/grget
installman: pwget.1
# use install for BSD and cpset for SYSV
# install -c -o $(MANOWNER) -g $(MANGROUP) -m $(MANMODE) pwget.1 $(MANDEST)
cpset pwget.1 $(MANDEST) $(MANMODE) $(MANOWNER) $(MANGROUP)
grget: pwget
ln pwget grget
pwget: pwget.o
cc $(LDFLAGS) -o pwget pwget.o
pwget.o: pwget.c
cc $(CFLAGS) -c pwget.c
pwget.cat: pwget.1
tbl pwget.1 | nroff -man -T > pwget.cat
clean:
/bin/rm -f pwget.o pwget grget
clobber: clean
@EOF
chmod 664 Makefile
echo x - pwget.1
cat >pwget.1 <<'@EOF'
.TH PWGET UTIL "" "" ""
.ad b
.SH NAME
pwget, grget \- get password and group information
.SH SYNOPSIS
.B pwget
.RB [ " \-n" " name"
.RB | " \-u" " uid " ]
.PP
.B grget
.RB [ " \-n" " name"
.RB | " \-g" " gid " ]
.br
.SH DESCRIPTION
.I Pwget\^
and
.I grget\^
are used to access the information found in
.B /etc/passwd
and
.BR /etc/group .
These routines provide a common access method
whether using the Yellow Page network database or not.
The output of these routines is sent to standard output.
With no options,
.I pwget
and
.I grget
output all of the data found using
.IR getpwent( LIBC )
and
.IR getgrent( LIBC )
respectively.
When options are given, only specified entries are searched for.
.PP
The options for
.I pwget
are:
.RS
.TP .8i
.BI \-n " name"
Output the first entry that matches using
.BI getpwnam( name ).
.TP
.BI \-u " uid"
Output the first entry that matches using
.BI getpwuid( uid ).
.RE
.PP
The options for
.I grget
are:
.RS
.TP .8i
.BI \-n " name"
Output the first entry that matches using
.BI getgrnam( name ).
.TP
.BI \-g " gid"
Output the first entry that matches using
.BI getgrgid( gid ).
.RE
.SH RETURN VALUE
These routines return 0 upon success, 1 when
a specific search fails and 2 upon error.
.SH WARNINGS
If the Yellow Page network database is in use and the
YP client daemon,
.IR ypbind (ADMIN),
is not connected to a YP server daemon,
.IR ypserv (ADMIN),
then these utilities will wait until such a connection is
established. These routines can be terminated in this
condition by sending a SIGINT signal to the process (see
.IR kill (UTIL)).
.SH AUTHOR
Pwget and grget were developed by Hewlett-Packard Company.
.SH FILES
.TS
l l.
/etc/group Local group data file
/etc/passwd Local password data file
.TE
.SH SEE ALSO
getgrent(LIBC), getpwent(LIBC), group(FILE), passwd(FILE).
@EOF
chmod 644 pwget.1
echo x - pwget.c
cat >pwget.c <<'@EOF'
#include <stdio.h>
#include <grp.h>
#include <pwd.h>
#ifdef SYSV
#include <string.h>
#else /* not SYSV but BSD */
#include <strings.h>
#endif /* SYSV / BSD */
int atoi(), getopt();
char *arg0;
#define GRGET 1
#define PWGET 2
int mode; /* Mode of operation, either GRGET or PWGET. */
main(argc, argv)
int argc;
char **argv;
{
int printgr(), printpw();
int c;
extern char *optarg;
extern int optind;
struct group *grp;
struct passwd *pwd;
int anyflag = 0,
gflag = 0,
nflag = 0,
uflag = 0;
int gid, uid;
char *name, *opts;
mode = 0;
#ifdef SYSV
if ((arg0 = strrchr(argv[0], '/')) == NULL)
#else /* not SYSV but BSD */
if ((arg0 = rindex(argv[0], '/')) == NULL)
#endif /* SYSV / BSD */
arg0 = argv[0];
else
arg0++; /* Start after the '/' */
if (strcmp(arg0, "grget") == 0)
mode = GRGET;
else if (strcmp(arg0, "pwget") == 0)
mode = PWGET;
else
usage();
switch(mode)
{
case GRGET:
setgrent();
opts = "g:n:";
break;
case PWGET:
setpwent();
opts = "u:n:";
break;
}
while ((c = getopt(argc, argv, opts)) != EOF)
{
switch (c)
{
case 'g':
if (anyflag != 0)
usage();
gflag++;
anyflag++;
gid = atoi(optarg);
break;
case 'n':
if (anyflag != 0)
usage();
nflag++;
anyflag++;
name = optarg;
break;
case 'u':
if (anyflag != 0)
usage();
uflag++;
anyflag++;
uid = atoi(optarg);
break;
case '?':
usage();
break;
}
}
if (argv[optind] != NULL)
usage();
if (gflag)
{
if ((grp = getgrgid(gid)) != NULL)
printgr(grp);
else
exit(1);
}
else if (nflag)
{
if (mode == GRGET)
{
if ((grp = getgrnam(name)) != NULL)
printgr(grp);
else
exit(1);
}
else if (mode == PWGET)
{
if ((pwd = getpwnam(name)) != NULL)
printpw(pwd);
else
exit(1);
}
}
else if (uflag)
{
if ((pwd = getpwuid(uid)) != NULL)
printpw(pwd);
else
exit(1);
}
else
{
if (mode == GRGET)
{
while ((grp = getgrent()) != NULL)
printgr(grp);
}
else if (mode == PWGET)
{
while ((pwd = getpwent()) != NULL)
printpw(pwd);
}
}
switch(mode)
{
case GRGET:
endgrent();
break;
case PWGET:
endpwent();
break;
}
exit(0);
}
usage()
{
switch(mode)
{
case GRGET:
fprintf(stderr, "usage: %s [ -g gid | -n name ]\n", arg0);
break;
case PWGET:
fprintf(stderr, "usage: %s [ -n name | -u uid ]\n", arg0);
break;
default:
fprintf(stderr, "Call as either grget or pwget\n");
break;
}
exit(2);
}
printgr(g)
struct group *g;
{
char **chr;
int comma;
if (g != NULL)
{
printf("%s:%s:%d:", g->gr_name, g->gr_passwd, g->gr_gid);
/* prints "grp1,grp2,grp3, ... ,grpn" */
for (comma = 0, chr = g->gr_mem; *chr != NULL; chr++)
printf("%s%s", ((comma==0)?comma++,"":","), *chr);
printf("\n");
}
}
printpw(p)
struct passwd *p;
{
if (p != NULL)
{
printf("%s:%s", p->pw_name, p->pw_passwd);
#ifdef SYSV
if (strcmp(p->pw_age, "") != 0)
printf(",%s", p->pw_age);
#endif /* SYSV */
printf(":%d:%d:%s:%s:%s\n", p->pw_uid, p->pw_gid,
p->pw_gecos, p->pw_dir, p->pw_shell);
}
}
@EOF
chmod 666 pwget.c
exit 0
--
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