352 lines
7.5 KiB
C
352 lines
7.5 KiB
C
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/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)id.c 5.1 (Berkeley) 6/29/91";
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#endif /* not lint */
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#include <sys/param.h>
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#include <pwd.h>
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#include <grp.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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typedef struct passwd PW;
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typedef struct group GR;
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void current __P((void));
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void err __P((const char *, ...));
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int gcmp __P((const void *, const void *));
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void sgroup __P((PW *));
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void ugroup __P((PW *));
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void usage __P((void));
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void user __P((PW *));
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PW *who __P((char *));
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int Gflag, gflag, nflag, rflag, uflag;
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main(argc, argv)
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int argc;
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char *argv[];
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{
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GR *gr;
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PW *pw;
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int ch, id;
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while ((ch = getopt(argc, argv, "Ggnru")) != EOF)
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switch(ch) {
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case 'G':
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Gflag = 1;
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break;
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case 'g':
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gflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 'r':
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rflag = 1;
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break;
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case 'u':
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uflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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pw = *argv ? who(*argv) : NULL;
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if (Gflag + gflag + uflag > 1)
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usage();
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if (Gflag) {
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if (nflag)
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sgroup(pw);
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else
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ugroup(pw);
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exit(0);
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}
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if (gflag) {
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id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
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if (nflag && (gr = getgrgid(id))) {
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(void)printf("%s\n", gr->gr_name);
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exit(0);
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}
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(void)printf("%u\n", id);
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exit(0);
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}
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if (uflag) {
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id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
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if (nflag && (pw = getpwuid(id))) {
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(void)printf("%s\n", pw->pw_name);
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exit(0);
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}
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(void)printf("%u\n", id);
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exit(0);
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}
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if (pw)
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user(pw);
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else
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current();
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exit(0);
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}
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void
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sgroup(pw)
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PW *pw;
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{
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register int id, lastid;
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char *fmt;
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if (pw) {
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register GR *gr;
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register char *name, **p;
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name = pw->pw_name;
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for (fmt = "%s", lastid = -1; gr = getgrent(); lastid = id) {
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for (p = gr->gr_mem; p && *p; p++)
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if (!strcmp(*p, name)) {
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(void)printf(fmt, gr->gr_name);
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fmt = " %s";
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break;
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}
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}
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} else {
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GR *gr;
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register int ngroups;
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int groups[NGROUPS + 1];
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groups[0] = getgid();
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ngroups = getgroups(NGROUPS, groups + 1) + 1;
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heapsort(groups, ngroups, sizeof(groups[0]), gcmp);
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for (fmt = "%s", lastid = -1; --ngroups >= 0;) {
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if (lastid == (id = groups[ngroups]))
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continue;
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if (gr = getgrgid(id))
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(void)printf(fmt, gr->gr_name);
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else
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(void)printf(*fmt == ' ' ? " %u" : "%u", id);
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fmt = " %s";
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lastid = id;
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}
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}
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(void)printf("\n");
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}
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void
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ugroup(pw)
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PW *pw;
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{
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register int id, lastid;
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register char *fmt;
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if (pw) {
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register GR *gr;
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register char *name, **p;
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name = pw->pw_name;
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for (fmt = "%u", lastid = -1; gr = getgrent(); lastid = id) {
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for (p = gr->gr_mem; p && *p; p++)
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if (!strcmp(*p, name)) {
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(void)printf(fmt, gr->gr_gid);
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fmt = " %u";
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break;
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}
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}
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} else {
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register int ngroups;
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int groups[NGROUPS + 1];
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groups[0] = getgid();
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ngroups = getgroups(NGROUPS, groups + 1) + 1;
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heapsort(groups, ngroups, sizeof(groups[0]), gcmp);
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for (fmt = "%u", lastid = -1; --ngroups >= 0;) {
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if (lastid == (id = groups[ngroups]))
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continue;
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(void)printf(fmt, id);
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fmt = " %u";
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lastid = id;
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}
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}
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(void)printf("\n");
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}
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void
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current()
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{
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GR *gr;
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PW *pw;
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int id, eid, lastid, ngroups, groups[NGROUPS];
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char *fmt;
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id = getuid();
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(void)printf("uid=%u", id);
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if (pw = getpwuid(id))
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(void)printf("(%s)", pw->pw_name);
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if ((eid = geteuid()) != id) {
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(void)printf(" euid=%u", eid);
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if (pw = getpwuid(eid))
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(void)printf("(%s)", pw->pw_name);
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}
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id = getgid();
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(void)printf(" gid=%u", id);
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if (gr = getgrgid(id))
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(void)printf("(%s)", gr->gr_name);
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if ((eid = getegid()) != id) {
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(void)printf(" egid=%u", eid);
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if (gr = getgrgid(eid))
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(void)printf("(%s)", gr->gr_name);
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}
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if (ngroups = getgroups(NGROUPS, groups)) {
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heapsort(groups, ngroups, sizeof(groups[0]), gcmp);
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for (fmt = " groups=%u", lastid = -1; --ngroups >= 0;
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fmt = ", %u", lastid = id) {
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id = groups[ngroups];
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if (lastid == id)
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continue;
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(void)printf(fmt, id);
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if (gr = getgrgid(id))
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(void)printf("(%s)", gr->gr_name);
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}
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}
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(void)printf("\n");
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}
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void
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user(pw)
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register PW *pw;
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{
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register GR *gr;
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register int id, lastid;
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register char *fmt, **p;
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id = pw->pw_uid;
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(void)printf("uid=%u(%s)", id, pw->pw_name);
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(void)printf(" gid=%u", pw->pw_gid);
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if (gr = getgrgid(id))
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(void)printf("(%s)", gr->gr_name);
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for (fmt = " groups=%u(%s)", lastid = -1; gr = getgrent();
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lastid = id) {
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if (pw->pw_gid == gr->gr_gid)
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continue;
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for (p = gr->gr_mem; p && *p; p++)
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if (!strcmp(*p, pw->pw_name)) {
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(void)printf(fmt, gr->gr_gid, gr->gr_name);
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fmt = ", %u(%s)";
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break;
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}
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}
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(void)printf("\n");
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}
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PW *
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who(u)
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char *u;
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{
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PW *pw;
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long id;
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char *ep;
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/*
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* Translate user argument into a pw pointer. First, try to
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* get it as specified. If that fails, try it as a number.
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*/
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if (pw = getpwnam(u))
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return(pw);
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id = strtol(u, &ep, 10);
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if (*u && !*ep && (pw = getpwuid(id)))
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return(pw);
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err("%s: No such user", u);
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/* NOTREACHED */
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}
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gcmp(a, b)
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const void *a, *b;
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{
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return(*(int *)b - *(int *)a);
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}
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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void
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#if __STDC__
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err(const char *fmt, ...)
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#else
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err(fmt, va_alist)
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char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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(void)fprintf(stderr, "id: ");
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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(void)fprintf(stderr, "\n");
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exit(1);
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/* NOTREACHED */
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: id [user]\n");
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(void)fprintf(stderr, " id -G [-n] [user]\n");
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(void)fprintf(stderr, " id -g [-nr] [user]\n");
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(void)fprintf(stderr, " id -u [-nr] [user]\n");
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exit(1);
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}
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