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/* vi: set sw=4 ts=4:
*
* id.c - print real and effective user and group IDs
*
* Copyright 2012 Sony Network Entertainment, Inc.
*
* by Tim Bird <tim.bird@am.sony.com>
*
* See http://www.opengroup.org/onlinepubs/009695399/utilities/id.html
USE_ID(NEWTOY(id, "nGgru", TOYFLAG_BIN))
config ID
bool "id"
default y
help
usage: id [-nGgru]
Print user and group ID.
-n print names instead of numeric IDs (to be used with -Ggu)
-G Show only the group IDs
-g Show only the effective group ID
-r Show real ID instead of effective ID
-u Show only the effective user ID
*/
#include "toys.h"
#define FLAG_n (1<<4)
#define FLAG_G (1<<3)
#define FLAG_g (1<<2)
#define FLAG_r (1<<1)
#define FLAG_u 1
static void s_or_u(char *s, unsigned u, int done)
{
if (toys.optflags & FLAG_n) printf("%s", s);
else printf("%u", u);
if (done) {
xputc('\n');
exit(0);
}
}
static void showid(char *header, unsigned u, char *s)
{
printf("%s%u(%s)", header, u, s);
}
struct passwd *xgetpwuid(uid_t uid)
{
struct passwd *pwd = getpwuid(uid);
if (!pwd) error_exit(NULL);
return pwd;
}
struct group *xgetgrgid(gid_t gid)
{
struct group *group = getgrgid(gid);
if (!group) error_exit(NULL);
return group;
}
void id_main(void)
{
int flags = toys.optflags, i, ngroups;
struct passwd *pw;
struct group *grp;
uid_t uid = getuid(), euid = geteuid();
gid_t gid = getgid(), egid = getegid(), *groups;
/* check if a username is given */
if (*toys.optargs) {
if (!(pw = getpwnam(*toys.optargs)))
error_exit("no such user '%s'", *toys.optargs);
uid = euid = pw->pw_uid;
gid = egid = pw->pw_gid;
}
i = toys.optflags & FLAG_r;
pw = xgetpwuid(i ? uid : euid);
if (flags & FLAG_u) s_or_u(pw->pw_name, pw->pw_uid, 1);
grp = xgetgrgid(i ? gid : egid);
if (flags & FLAG_g) s_or_u(grp->gr_name, grp->gr_gid, 1);
if (!(flags & FLAG_G)) {
showid("uid=", pw->pw_uid, pw->pw_name);
showid(" gid=", grp->gr_gid, grp->gr_name);
if (!i) {
if (uid != euid) {
pw = xgetpwuid(euid);
showid(" euid=", pw->pw_uid, pw->pw_name);
}
if (gid != egid) {
grp = xgetgrgid(egid);
showid(" egid=", grp->gr_gid, grp->gr_name);
}
}
showid(" groups=", grp->gr_gid, grp->gr_name);
}
groups = (gid_t *)toybuf;
if (0 >= (ngroups = getgroups(sizeof(toybuf)/sizeof(gid_t), groups)))
perror_exit(0);
for (i = 0; i < ngroups; i++) {
xputc(' ');
if (!(grp = getgrgid(groups[i]))) perror_msg(0);
else if (flags & FLAG_G)
s_or_u(grp->gr_name, grp->gr_gid, 0);
else if (grp->gr_gid != egid) showid("", grp->gr_gid, grp->gr_name);
}
xputc('\n');
}
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