144 lines
2.3 KiB
C
144 lines
2.3 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <grp.h>
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#include <limits.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "util.h"
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static void groupid(struct passwd *pw);
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static void user(struct passwd *pw);
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static void userid(uid_t id);
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static void usernam(const char *nam);
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static void
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usage(void)
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{
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eprintf("usage: %s [-g] [-u] [-G] [user | uid]\n", argv0);
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}
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static int Gflag = 0;
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int
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main(int argc, char *argv[])
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{
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ARGBEGIN {
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case 'g':
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printf("%d\n", getegid());
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return 0;
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case 'u':
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printf("%d\n", geteuid());
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return 0;
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case 'G':
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Gflag = 1;
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break;
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default:
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usage();
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} ARGEND;
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switch (argc) {
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case 0:
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userid(getuid());
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break;
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case 1:
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/* user names can't begin [0-9] */
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if (isdigit(argv[0][0]))
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userid(estrtol(argv[0], 0));
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else
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usernam(argv[0]);
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break;
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default:
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usage();
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}
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return 0;
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}
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static void
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groupid(struct passwd *pw)
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{
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gid_t gid, groups[NGROUPS_MAX];
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int ngroups;
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int i;
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ngroups = NGROUPS_MAX;
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getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
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for (i = 0; i < ngroups; i++) {
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gid = groups[i];
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printf("%u", gid);
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if (i < ngroups - 1)
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putchar(' ');
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}
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putchar('\n');
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}
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static void
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usernam(const char *nam)
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{
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struct passwd *pw;
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errno = 0;
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pw = getpwnam(nam);
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if (!pw) {
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if (errno)
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eprintf("getpwnam %s:", nam);
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else
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eprintf("getpwnam %s: no such user\n", nam);
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}
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if (Gflag)
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groupid(pw);
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else
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user(pw);
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}
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static void
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userid(uid_t id)
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{
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struct passwd *pw;
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errno = 0;
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pw = getpwuid(id);
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if (!pw) {
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if (errno)
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eprintf("getpwuid %d:", id);
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else
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eprintf("getpwuid %d: no such user\n", id);
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}
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if (Gflag)
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groupid(pw);
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else
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user(pw);
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}
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static void
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user(struct passwd *pw)
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{
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struct group *gr;
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gid_t gid, groups[NGROUPS_MAX];
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int ngroups;
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int i;
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printf("uid=%u(%s)", pw->pw_uid, pw->pw_name);
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printf(" gid=%u", pw->pw_gid);
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if (!(gr = getgrgid(pw->pw_gid)))
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eprintf("getgrgid:");
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printf("(%s)", gr->gr_name);
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ngroups = NGROUPS_MAX;
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getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
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for (i = 0; i < ngroups; i++) {
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gid = groups[i];
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printf("%s%u", !i ? " groups=" : ",", gid);
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if (!(gr = getgrgid(gid)))
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eprintf("getgrgid:");
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printf("(%s)", gr->gr_name);
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}
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putchar('\n');
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}
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