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-rw-r--r--usr.bin/id/id.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/usr.bin/id/id.c b/usr.bin/id/id.c
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--- /dev/null
+++ b/usr.bin/id/id.c
@@ -0,0 +1,370 @@
+/*-
+ * 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. 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1991, 1993\
+ The Regents of the University of California. All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)id.c 8.3 (Berkeley) 4/28/95";
+#else
+__RCSID("$NetBSD: id.c,v 1.32 2011/09/16 15:39:26 joerg Exp $");
+#endif
+#endif /* not lint */
+
+#include <sys/param.h>
+
+#include <err.h>
+#include <errno.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void current(void);
+static void pretty(struct passwd *);
+static void group(struct passwd *, int);
+__dead static void usage(void);
+static void user(struct passwd *);
+static struct passwd *who(char *);
+
+static int maxgroups;
+static gid_t *groups;
+
+int
+main(int argc, char *argv[])
+{
+ struct group *gr;
+ struct passwd *pw;
+ int ch, id;
+ int Gflag, gflag, nflag, pflag, rflag, uflag;
+ const char *opts;
+
+ Gflag = gflag = nflag = pflag = rflag = uflag = 0;
+
+ if (strcmp(getprogname(), "groups") == 0) {
+ Gflag = 1;
+ nflag = 1;
+ opts = "";
+ if (argc > 2)
+ usage();
+ } else if (strcmp(getprogname(), "whoami") == 0) {
+ uflag = 1;
+ nflag = 1;
+ opts = "";
+ if (argc > 1)
+ usage();
+ } else
+ opts = "Ggnpru";
+
+ while ((ch = getopt(argc, argv, opts)) != -1)
+ switch (ch) {
+ case 'G':
+ Gflag = 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;
+
+ switch (Gflag + gflag + pflag + uflag) {
+ case 1:
+ break;
+ case 0:
+ if (!nflag && !rflag)
+ break;
+ /* FALLTHROUGH */
+ default:
+ usage();
+ }
+
+ if (strcmp(opts, "") != 0 && argc > 1)
+ usage();
+
+ pw = *argv ? who(*argv) : NULL;
+
+ maxgroups = sysconf(_SC_NGROUPS_MAX);
+ if ((groups = malloc((maxgroups + 1) * sizeof(gid_t))) == NULL)
+ err(1, 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);
+ goto done;
+ }
+
+ 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);
+ goto done;
+ }
+
+ if (Gflag) {
+ group(pw, nflag);
+ goto done;
+ }
+
+ if (pflag) {
+ pretty(pw);
+ goto done;
+ }
+
+ if (pw)
+ user(pw);
+ else
+ current();
+done:
+ free(groups);
+
+ return 0;
+}
+
+static void
+pretty(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)) != NULL)
+ (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)) != NULL)
+ (void)printf("rgid\t%s\n", gr->gr_name);
+ else
+ (void)printf("rgid\t%u\n", rid);
+ }
+ (void)printf("groups\t");
+ group(NULL, 1);
+ }
+}
+
+static void
+current(void)
+{
+ struct group *gr;
+ struct passwd *pw;
+ gid_t gid, egid, lastid;
+ uid_t uid, euid;
+ int cnt, ngroups;
+ const char *fmt;
+
+ uid = getuid();
+ (void)printf("uid=%ju", (uintmax_t)uid);
+ if ((pw = getpwuid(uid)) != NULL)
+ (void)printf("(%s)", pw->pw_name);
+ gid = getgid();
+ (void)printf(" gid=%ju", (uintmax_t)gid);
+ if ((gr = getgrgid(gid)) != NULL)
+ (void)printf("(%s)", gr->gr_name);
+ if ((euid = geteuid()) != uid) {
+ (void)printf(" euid=%ju", (uintmax_t)euid);
+ if ((pw = getpwuid(euid)) != NULL)
+ (void)printf("(%s)", pw->pw_name);
+ }
+ if ((egid = getegid()) != gid) {
+ (void)printf(" egid=%ju", (uintmax_t)egid);
+ if ((gr = getgrgid(egid)) != NULL)
+ (void)printf("(%s)", gr->gr_name);
+ }
+ if ((ngroups = getgroups(maxgroups, groups)) != 0) {
+ for (fmt = " groups=%ju", lastid = -1, cnt = 0; cnt < ngroups;
+ fmt = ",%ju", lastid = gid, cnt++) {
+ gid = groups[cnt];
+ if (lastid == gid)
+ continue;
+ (void)printf(fmt, (uintmax_t)gid);
+ if ((gr = getgrgid(gid)) != NULL)
+ (void)printf("(%s)", gr->gr_name);
+ }
+ }
+ (void)printf("\n");
+}
+
+static void
+user(struct passwd *pw)
+{
+ struct group *gr;
+ const char *fmt;
+ int cnt, id, lastid, ngroups;
+ gid_t *glist = groups;
+
+ id = pw->pw_uid;
+ (void)printf("uid=%u(%s)", id, pw->pw_name);
+ (void)printf(" gid=%lu", (u_long)pw->pw_gid);
+ if ((gr = getgrgid(pw->pw_gid)) != NULL)
+ (void)printf("(%s)", gr->gr_name);
+ ngroups = maxgroups + 1;
+ if (getgrouplist(pw->pw_name, pw->pw_gid, glist, &ngroups) == -1) {
+ glist = malloc(ngroups * sizeof(gid_t));
+ (void) getgrouplist(pw->pw_name, pw->pw_gid, glist, &ngroups);
+ }
+ for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
+ fmt=",%u", lastid = id, cnt++) {
+ id = glist[cnt];
+ if (lastid == id)
+ continue;
+ (void)printf(fmt, id);
+ if ((gr = getgrgid(id)) != NULL)
+ (void)printf("(%s)", gr->gr_name);
+ }
+ (void)printf("\n");
+ if (glist != groups)
+ free(glist);
+}
+
+static void
+group(struct passwd *pw, int nflag)
+{
+ struct group *gr;
+ int cnt, ngroups;
+ gid_t id, lastid;
+ const char *fmt;
+ gid_t *glist = groups;
+
+ if (pw) {
+ ngroups = maxgroups;
+ if (getgrouplist(pw->pw_name, pw->pw_gid, glist, &ngroups)
+ == -1) {
+ glist = malloc(ngroups * sizeof(gid_t));
+ (void) getgrouplist(pw->pw_name, pw->pw_gid, glist,
+ &ngroups);
+ }
+ } else {
+ glist[0] = getgid();
+ ngroups = getgroups(maxgroups, glist + 1) + 1;
+ }
+ fmt = nflag ? "%s" : "%u";
+ for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
+ if (lastid == (id = glist[cnt]) || (cnt && id == glist[0]))
+ continue;
+ if (nflag) {
+ if ((gr = getgrgid(id)) != NULL)
+ (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");
+ if (glist != groups)
+ free(glist);
+}
+
+static struct passwd *
+who(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)) != NULL)
+ return pw;
+ id = strtol(u, &ep, 10);
+ if (*u && !*ep && (pw = getpwuid(id)))
+ return pw;
+ errx(1, "%s: No such user", u);
+ /* NOTREACHED */
+ return NULL;
+}
+
+static void
+usage(void)
+{
+
+ if (strcmp(getprogname(), "groups") == 0) {
+ (void)fprintf(stderr, "usage: groups [user]\n");
+ } else if (strcmp(getprogname(), "whoami") == 0) {
+ (void)fprintf(stderr, "usage: whoami\n");
+ } else {
+ (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 -p [user]\n");
+ (void)fprintf(stderr, " id -u [-nr] [user]\n");
+ }
+ exit(1);
+}
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