sbase/id.c

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1.3 KiB
C
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2013-08-07 12:40:21 +00:00
/* See LICENSE file for copyright and license details. */
#include <sys/types.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>
#include <stdio.h>
#include <limits.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s\n", argv0);
}
int
main(int argc, char *argv[])
{
struct passwd *pw;
struct group *gr;
uid_t uid, euid;
gid_t gid, egid, groups[NGROUPS_MAX];
int ngroups;
int i;
ARGBEGIN {
default:
usage();
} ARGEND;
/* Print uid/euid info */
uid = getuid();
printf("uid=%u", uid);
if (!(pw = getpwuid(uid)))
eprintf("getpwuid:");
printf("(%s)", pw->pw_name);
if ((euid = geteuid()) != uid) {
printf(" euid=%u", euid);
if (!(pw = getpwuid(euid)))
eprintf("getpwuid:");
printf("(%s)", pw->pw_name);
}
/* Print gid/egid info */
gid = getgid();
printf(" gid=%u", gid);
if (!(gr = getgrgid(gid)))
eprintf("getgrgid:");
printf("(%s)", gr->gr_name);
if ((egid = getegid()) != gid) {
printf(" egid=%u", egid);
if (!(gr = getgrgid(egid)))
eprintf("getgrgid:");
printf("(%s)", gr->gr_name);
}
/* Print groups */
ngroups = getgroups(NGROUPS_MAX, groups);
if (ngroups < 0)
eprintf("getgroups:");
for (i = 0; i < ngroups; i++) {
gid = groups[i];
printf("%s%u", !i ? " groups=" : ",", gid);
if (!(gr = getgrgid(gid)))
eprintf("getgrgid:");
printf("(%s)", gr->gr_name);
}
putchar('\n');
return 0;
}