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/* 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://opengroup.org/onlinepubs/9699919799/utilities/id.html
USE_ID(NEWTOY(id, ">1"USE_ID_SELINUX("Z")"nGgru[!"USE_ID_SELINUX("Z")"Ggu]", TOYFLAG_BIN))
USE_GROUPS(NEWTOY(groups, NULL, TOYFLAG_USR|TOYFLAG_BIN))
USE_LOGNAME(NEWTOY(logname, ">0", TOYFLAG_BIN))
USE_WHOAMI(OLDTOY(whoami, logname, 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
config ID_SELINUX
bool
default y
depends on ID && TOYBOX_SELINUX
help
usage: id [-Z]
-Z Show only SELinux context
config GROUPS
bool "groups"
default y
help
usage: groups [user]
Print the groups a user is in.
config LOGNAME
bool "logname"
default y
help
usage: logname
Print the current user name.
config WHOAMI
bool "whoami"
default y
help
usage: whoami
Print the current user name.
*/
#define FOR_id
#include "toys.h"
GLOBALS(
int do_u, do_n, do_G, do_Z, is_groups;
)
static void s_or_u(char *s, unsigned u, int done)
{
if (TT.do_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);
}
void do_id(char *username)
{
int flags, i, ngroups;
struct passwd *pw;
struct group *grp;
uid_t uid = getuid(), euid = geteuid();
gid_t gid = getgid(), egid = getegid(), *groups;
flags = toys.optflags;
// check if a username is given
if (username) {
pw = xgetpwnam(username);
uid = euid = pw->pw_uid;
gid = egid = pw->pw_gid;
if (TT.is_groups) printf("%s : ", pw->pw_name);
}
i = flags & FLAG_r;
pw = xgetpwuid(i ? uid : euid);
if (TT.do_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 (!TT.do_G && !TT.do_Z) {
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);
}
if (!TT.do_Z) {
groups = (gid_t *)toybuf;
i = sizeof(toybuf)/sizeof(gid_t);
ngroups = username ? getgrouplist(username, gid, groups, &i)
: getgroups(i, groups);
if (ngroups<0) perror_exit(0);
int show_separator = !TT.do_G;
for (i = 0; i<ngroups; i++) {
if (show_separator) xputc(TT.do_G ? ' ' : ',');
show_separator = 1;
if (!(grp = getgrgid(groups[i]))) perror_msg(0);
else if (TT.do_G) s_or_u(grp->gr_name, grp->gr_gid, 0);
else if (grp->gr_gid != egid) showid("", grp->gr_gid, grp->gr_name);
else show_separator = 0; // Because we didn't show anything this time.
}
if (TT.do_G) {
xputc('\n');
exit(0);
}
}
#if CFG_TOYBOX_SELINUX
char *context = NULL;
if (is_selinux_enabled() < 1) {
if (TT.do_Z)
error_exit("SELinux disabled");
} else if (getcon(&context) == 0) {
if (!TT.do_Z) xputc(' ');
printf("context=%s", context);
}
if (CFG_TOYBOX_FREE) free(context);
#endif
xputc('\n');
}
void id_main(void)
{
// FLAG macros can be 0 if "id" command not enabled, so snapshot them here.
if (FLAG_u) TT.do_u |= toys.optflags & FLAG_u;
if (FLAG_n) TT.do_n |= toys.optflags & FLAG_n;
if (FLAG_G) TT.do_G |= toys.optflags & FLAG_G;
if (FLAG_Z) TT.do_Z |= toys.optflags & FLAG_Z;
if (toys.optc) while(*toys.optargs) do_id(*toys.optargs++);
else do_id(NULL);
}
void groups_main(void)
{
TT.is_groups = 1;
TT.do_G = TT.do_n = 1;
id_main();
}
void logname_main(void)
{
TT.do_u = TT.do_n = 1;
id_main();
}
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