freebsd-dev/usr.bin/id/id.c
2001-09-14 14:04:08 +00:00

384 lines
8.4 KiB
C

/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)id.c 8.2 (Berkeley) 2/16/94";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <err.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int main __P((int, char *[]));
void current __P((void));
void pline __P((struct passwd *));
void pretty __P((struct passwd *));
void group __P((struct passwd *, int));
void usage __P((void));
void user __P((struct passwd *));
struct passwd *
who __P((char *));
int isgroups, iswhoami;
int
main(argc, argv)
int argc;
char *argv[];
{
struct group *gr;
struct passwd *pw;
int Gflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
const char *myname;
Gflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
myname = strrchr(argv[0], '/');
myname = (myname != NULL) ? myname + 1 : argv[0];
if (strcmp(myname, "groups") == 0) {
isgroups = 1;
Gflag = nflag = 1;
}
else if (strcmp(myname, "whoami") == 0) {
iswhoami = 1;
uflag = nflag = 1;
}
while ((ch = getopt(argc, argv,
(isgroups || iswhoami) ? "" : "PGgnpru")) != -1)
switch(ch) {
case 'G':
Gflag = 1;
break;
case 'P':
Pflag = 1;
break;
case 'g':
gflag = 1;
break;
case 'n':
nflag = 1;
break;
case 'p':
pflag = 1;
break;
case 'r':
rflag = 1;
break;
case 'u':
uflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (iswhoami && argc > 0)
usage();
switch(Gflag + Pflag + gflag + pflag + uflag) {
case 1:
break;
case 0:
if (!nflag && !rflag)
break;
/* FALLTHROUGH */
default:
usage();
}
pw = *argv ? who(*argv) : NULL;
if (gflag) {
id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
if (nflag && (gr = getgrgid(id)))
(void)printf("%s\n", gr->gr_name);
else
(void)printf("%u\n", id);
exit(0);
}
if (uflag) {
id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
if (nflag && (pw = getpwuid(id)))
(void)printf("%s\n", pw->pw_name);
else
(void)printf("%u\n", id);
exit(0);
}
if (Gflag) {
group(pw, nflag);
exit(0);
}
if (Pflag) {
pline(pw);
exit(0);
}
if (pflag) {
pretty(pw);
exit(0);
}
if (pw)
user(pw);
else
current();
exit(0);
}
void
pretty(pw)
struct passwd *pw;
{
struct group *gr;
u_int eid, rid;
char *login;
if (pw) {
(void)printf("uid\t%s\n", pw->pw_name);
(void)printf("groups\t");
group(pw, 1);
} else {
if ((login = getlogin()) == NULL)
err(1, "getlogin");
pw = getpwuid(rid = getuid());
if (pw == NULL || strcmp(login, pw->pw_name))
(void)printf("login\t%s\n", login);
if (pw)
(void)printf("uid\t%s\n", pw->pw_name);
else
(void)printf("uid\t%u\n", rid);
if ((eid = geteuid()) != rid) {
if ((pw = getpwuid(eid)))
(void)printf("euid\t%s\n", pw->pw_name);
else
(void)printf("euid\t%u\n", eid);
}
if ((rid = getgid()) != (eid = getegid())) {
if ((gr = getgrgid(rid)))
(void)printf("rgid\t%s\n", gr->gr_name);
else
(void)printf("rgid\t%u\n", rid);
}
(void)printf("groups\t");
group(NULL, 1);
}
}
void
current()
{
struct group *gr;
struct passwd *pw;
int cnt, id, eid, lastid, ngroups;
gid_t groups[NGROUPS];
const char *fmt;
id = getuid();
(void)printf("uid=%u", id);
if ((pw = getpwuid(id)))
(void)printf("(%s)", pw->pw_name);
if ((eid = geteuid()) != id) {
(void)printf(" euid=%u", eid);
if ((pw = getpwuid(eid)))
(void)printf("(%s)", pw->pw_name);
}
id = getgid();
(void)printf(" gid=%u", id);
if ((gr = getgrgid(id)))
(void)printf("(%s)", gr->gr_name);
if ((eid = getegid()) != id) {
(void)printf(" egid=%u", eid);
if ((gr = getgrgid(eid)))
(void)printf("(%s)", gr->gr_name);
}
if ((ngroups = getgroups(NGROUPS, groups))) {
for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
fmt = ", %u", lastid = id) {
id = groups[cnt++];
if (lastid == id)
continue;
(void)printf(fmt, id);
if ((gr = getgrgid(id)))
(void)printf("(%s)", gr->gr_name);
}
}
(void)printf("\n");
}
void
user(pw)
struct passwd *pw;
{
struct group *gr;
const char *fmt;
int cnt, gid, lastgid, ngroups, groups[NGROUPS + 1];
(void)printf("uid=%u(%s)", pw->pw_uid, pw->pw_name);
gid = pw->pw_gid;
(void)printf(" gid=%u", gid);
if ((gr = getgrgid(gid)))
(void)printf("(%s)", gr->gr_name);
ngroups = NGROUPS + 1;
(void) getgrouplist(pw->pw_name, gid, groups, &ngroups);
fmt = " groups=%u";
for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
if (lastgid == (gid = groups[cnt]))
continue;
(void)printf(fmt, gid);
fmt = ", %u";
if ((gr = getgrgid(gid)))
(void)printf("(%s)", gr->gr_name);
lastgid = gid;
}
(void)printf("\n");
}
void
group(pw, nflag)
struct passwd *pw;
int nflag;
{
struct group *gr;
int cnt, id, lastid, ngroups;
gid_t groups[NGROUPS + 1];
const char *fmt;
if (pw) {
ngroups = NGROUPS + 1;
(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
} else {
groups[0] = getgid();
ngroups = getgroups(NGROUPS, groups + 1) + 1;
}
fmt = nflag ? "%s" : "%u";
for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
if (lastid == (id = groups[cnt]))
continue;
if (nflag) {
if ((gr = getgrgid(id)))
(void)printf(fmt, gr->gr_name);
else
(void)printf(*fmt == ' ' ? " %u" : "%u",
id);
fmt = " %s";
} else {
(void)printf(fmt, id);
fmt = " %u";
}
lastid = id;
}
(void)printf("\n");
}
struct passwd *
who(u)
char *u;
{
struct passwd *pw;
long id;
char *ep;
/*
* Translate user argument into a pw pointer. First, try to
* get it as specified. If that fails, try it as a number.
*/
if ((pw = getpwnam(u)))
return(pw);
id = strtol(u, &ep, 10);
if (*u && !*ep && (pw = getpwuid(id)))
return(pw);
errx(1, "%s: no such user", u);
/* NOTREACHED */
}
void
pline(pw)
struct passwd *pw;
{
u_int rid;
if (!pw) {
if ((pw = getpwuid(rid = getuid())) == NULL)
err(1, "getpwuid");
}
(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
pw->pw_dir, pw->pw_shell);
}
void
usage()
{
if (isgroups)
(void)fprintf(stderr, "usage: groups [user]\n");
else if (iswhoami)
(void)fprintf(stderr, "usage: whoami\n");
else
(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n",
"usage: id [user]",
" id -G [-n] [user]",
" id -P [user]",
" id -g [-nr] [user]",
" id -p [user]",
" id -u [-nr] [user]");
exit(1);
}