+/*-
+ * Copyright (c) 1991 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ */
+
+#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) %G%";
+#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);
+}
projects / unix-history / commitdiff