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- /*-
- * Copyright (c) 1991 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
- char copyright[] =
- "@(#) Copyright (c) 1991 The Regents of the University of California.\n\
- All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char sccsid[] = "@(#)id.c 5.1 (Berkeley) 6/29/91";
- #endif /* not lint */
-
- #include <sys/param.h>
- #include <pwd.h>
- #include <grp.h>
- #include <errno.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
-
- typedef struct passwd PW;
- typedef struct group GR;
-
- void current __P((void));
- void err __P((const char *, ...));
- int gcmp __P((const void *, const void *));
- void sgroup __P((PW *));
- void ugroup __P((PW *));
- void usage __P((void));
- void user __P((PW *));
- PW *who __P((char *));
-
- int Gflag, gflag, nflag, rflag, uflag;
-
- main(argc, argv)
- int argc;
- char *argv[];
- {
- GR *gr;
- PW *pw;
- int ch, id;
-
- while ((ch = getopt(argc, argv, "Ggnru")) != EOF)
- switch(ch) {
- case 'G':
- Gflag = 1;
- break;
- case 'g':
- gflag = 1;
- break;
- case 'n':
- nflag = 1;
- break;
- case 'r':
- rflag = 1;
- break;
- case 'u':
- uflag = 1;
- break;
- case '?':
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
-
- pw = *argv ? who(*argv) : NULL;
-
- if (Gflag + gflag + uflag > 1)
- usage();
-
- if (Gflag) {
- if (nflag)
- sgroup(pw);
- else
- ugroup(pw);
- exit(0);
- }
-
- if (gflag) {
- id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
- if (nflag && (gr = getgrgid(id))) {
- (void)printf("%s\n", gr->gr_name);
- exit(0);
- }
- (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);
- exit(0);
- }
- (void)printf("%u\n", id);
- exit(0);
- }
-
- if (pw)
- user(pw);
- else
- current();
- exit(0);
- }
-
- void
- sgroup(pw)
- PW *pw;
- {
- register int id, lastid;
- char *fmt;
-
- if (pw) {
- register GR *gr;
- register char *name, **p;
-
- name = pw->pw_name;
- for (fmt = "%s", lastid = -1; gr = getgrent(); lastid = id) {
- for (p = gr->gr_mem; p && *p; p++)
- if (!strcmp(*p, name)) {
- (void)printf(fmt, gr->gr_name);
- fmt = " %s";
- break;
- }
- }
- } else {
- GR *gr;
- register int ngroups;
- int groups[NGROUPS + 1];
-
- groups[0] = getgid();
- ngroups = getgroups(NGROUPS, groups + 1) + 1;
- heapsort(groups, ngroups, sizeof(groups[0]), gcmp);
- for (fmt = "%s", lastid = -1; --ngroups >= 0;) {
- if (lastid == (id = groups[ngroups]))
- continue;
- if (gr = getgrgid(id))
- (void)printf(fmt, gr->gr_name);
- else
- (void)printf(*fmt == ' ' ? " %u" : "%u", id);
- fmt = " %s";
- lastid = id;
- }
- }
- (void)printf("\n");
- }
-
- void
- ugroup(pw)
- PW *pw;
- {
- register int id, lastid;
- register char *fmt;
-
- if (pw) {
- register GR *gr;
- register char *name, **p;
-
- name = pw->pw_name;
- for (fmt = "%u", lastid = -1; gr = getgrent(); lastid = id) {
- for (p = gr->gr_mem; p && *p; p++)
- if (!strcmp(*p, name)) {
- (void)printf(fmt, gr->gr_gid);
- fmt = " %u";
- break;
- }
- }
- } else {
- register int ngroups;
- int groups[NGROUPS + 1];
-
- groups[0] = getgid();
- ngroups = getgroups(NGROUPS, groups + 1) + 1;
- heapsort(groups, ngroups, sizeof(groups[0]), gcmp);
- for (fmt = "%u", lastid = -1; --ngroups >= 0;) {
- if (lastid == (id = groups[ngroups]))
- continue;
- (void)printf(fmt, id);
- fmt = " %u";
- lastid = id;
- }
- }
- (void)printf("\n");
- }
-
- void
- current()
- {
- GR *gr;
- PW *pw;
- int id, eid, lastid, ngroups, groups[NGROUPS];
- 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)) {
- heapsort(groups, ngroups, sizeof(groups[0]), gcmp);
- for (fmt = " groups=%u", lastid = -1; --ngroups >= 0;
- fmt = ", %u", lastid = id) {
- id = groups[ngroups];
- if (lastid == id)
- continue;
- (void)printf(fmt, id);
- if (gr = getgrgid(id))
- (void)printf("(%s)", gr->gr_name);
- }
- }
- (void)printf("\n");
- }
-
- void
- user(pw)
- register PW *pw;
- {
- register GR *gr;
- register int id, lastid;
- register char *fmt, **p;
-
- id = pw->pw_uid;
- (void)printf("uid=%u(%s)", id, pw->pw_name);
- (void)printf(" gid=%u", pw->pw_gid);
- if (gr = getgrgid(id))
- (void)printf("(%s)", gr->gr_name);
- for (fmt = " groups=%u(%s)", lastid = -1; gr = getgrent();
- lastid = id) {
- if (pw->pw_gid == gr->gr_gid)
- continue;
- for (p = gr->gr_mem; p && *p; p++)
- if (!strcmp(*p, pw->pw_name)) {
- (void)printf(fmt, gr->gr_gid, gr->gr_name);
- fmt = ", %u(%s)";
- break;
- }
- }
- (void)printf("\n");
- }
-
- PW *
- who(u)
- char *u;
- {
- PW *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);
- err("%s: No such user", u);
- /* NOTREACHED */
- }
-
- gcmp(a, b)
- const void *a, *b;
- {
- return(*(int *)b - *(int *)a);
- }
-
- #if __STDC__
- #include <stdarg.h>
- #else
- #include <varargs.h>
- #endif
-
- void
- #if __STDC__
- err(const char *fmt, ...)
- #else
- err(fmt, va_alist)
- char *fmt;
- va_dcl
- #endif
- {
- va_list ap;
- #if __STDC__
- va_start(ap, fmt);
- #else
- va_start(ap);
- #endif
- (void)fprintf(stderr, "id: ");
- (void)vfprintf(stderr, fmt, ap);
- va_end(ap);
- (void)fprintf(stderr, "\n");
- exit(1);
- /* NOTREACHED */
- }
-
- void
- usage()
- {
- (void)fprintf(stderr, "usage: id [user]\n");
- (void)fprintf(stderr, " id -G [-n] [user]\n");
- (void)fprintf(stderr, " id -g [-nr] [user]\n");
- (void)fprintf(stderr, " id -u [-nr] [user]\n");
- exit(1);
- }
-