1/* id.c - print real and effective user and group IDs
2 *
3 * Copyright 2012 Sony Network Entertainment, Inc.
4 *
5 * by Tim Bird <tim.bird@am.sony.com>
6 *
7 * See http://opengroup.org/onlinepubs/9699919799/utilities/id.html
8
9USE_ID(NEWTOY(id, ">1"USE_ID_Z("Z")"nGgru[!"USE_ID_Z("Z")"Ggu]", TOYFLAG_USR|TOYFLAG_BIN))
10USE_GROUPS(NEWTOY(groups, NULL, TOYFLAG_USR|TOYFLAG_BIN))
11USE_LOGNAME(NEWTOY(logname, ">0", TOYFLAG_USR|TOYFLAG_BIN))
12USE_WHOAMI(OLDTOY(whoami, logname, TOYFLAG_USR|TOYFLAG_BIN))
13
14config ID
15  bool "id"
16  default y
17  help
18    usage: id [-nGgru]
19
20    Print user and group ID.
21
22    -n	print names instead of numeric IDs (to be used with -Ggu)
23    -G	Show only the group IDs
24    -g	Show only the effective group ID
25    -r	Show real ID instead of effective ID
26    -u	Show only the effective user ID
27
28config ID_Z
29  bool
30  default y
31  depends on ID && !TOYBOX_LSM_NONE
32  help
33    usage: id [-Z]
34
35    -Z	Show only security context
36
37config GROUPS
38  bool "groups"
39  default y
40  help
41    usage: groups [user]
42
43    Print the groups a user is in.
44
45config LOGNAME
46  bool "logname"
47  default y
48  help
49    usage: logname
50
51    Print the current user name.
52
53config WHOAMI
54  bool "whoami"
55  default y
56  help
57    usage: whoami
58
59    Print the current user name.
60*/
61
62#define FOR_id
63#define FORCE_FLAGS
64#include "toys.h"
65
66GLOBALS(
67  int is_groups;
68)
69
70static void s_or_u(char *s, unsigned u, int done)
71{
72  if (toys.optflags&FLAG_n) printf("%s", s);
73  else printf("%u", u);
74  if (done) {
75    xputc('\n');
76    exit(0);
77  }
78}
79
80static void showid(char *header, unsigned u, char *s)
81{
82  printf("%s%u(%s)", header, u, s);
83}
84
85static void do_id(char *username)
86{
87  int flags, i, ngroups;
88  struct passwd *pw;
89  struct group *grp;
90  uid_t uid = getuid(), euid = geteuid();
91  gid_t gid = getgid(), egid = getegid(), *groups;
92
93  flags = toys.optflags;
94
95  // check if a username is given
96  if (username) {
97    pw = xgetpwnam(username);
98    uid = euid = pw->pw_uid;
99    gid = egid = pw->pw_gid;
100    if (TT.is_groups) printf("%s : ", pw->pw_name);
101  }
102
103  i = flags & FLAG_r;
104  pw = xgetpwuid(i ? uid : euid);
105  if (toys.optflags&FLAG_u) s_or_u(pw->pw_name, pw->pw_uid, 1);
106
107  grp = xgetgrgid(i ? gid : egid);
108  if (flags & FLAG_g) s_or_u(grp->gr_name, grp->gr_gid, 1);
109
110  if (!(toys.optflags&(FLAG_g|FLAG_Z))) {
111    showid("uid=", pw->pw_uid, pw->pw_name);
112    showid(" gid=", grp->gr_gid, grp->gr_name);
113
114    if (!i) {
115      if (uid != euid) {
116        pw = xgetpwuid(euid);
117        showid(" euid=", pw->pw_uid, pw->pw_name);
118      }
119      if (gid != egid) {
120        grp = xgetgrgid(egid);
121        showid(" egid=", grp->gr_gid, grp->gr_name);
122      }
123    }
124
125    showid(" groups=", grp->gr_gid, grp->gr_name);
126  }
127
128  if (!(toys.optflags&FLAG_Z)) {
129    groups = (gid_t *)toybuf;
130    i = sizeof(toybuf)/sizeof(gid_t);
131    ngroups = username ? getgrouplist(username, gid, groups, &i)
132      : getgroups(i, groups);
133    if (ngroups<0) perror_exit(0);
134
135    int show_separator = !(toys.optflags&FLAG_G);
136    for (i = 0; i<ngroups; i++) {
137      if (show_separator) xputc((toys.optflags&FLAG_G) ? ' ' : ',');
138      show_separator = 1;
139      if (!(grp = getgrgid(groups[i]))) perror_msg(0);
140      else if (toys.optflags&FLAG_G) s_or_u(grp->gr_name, grp->gr_gid, 0);
141      else if (grp->gr_gid != egid) showid("", grp->gr_gid, grp->gr_name);
142      else show_separator = 0; // Because we didn't show anything this time.
143    }
144    if (toys.optflags&FLAG_G) {
145      xputc('\n');
146      exit(0);
147    }
148  }
149
150  if (!CFG_TOYBOX_LSM_NONE) {
151    if (lsm_enabled()) {
152      char *context = lsm_context();
153
154      printf(" context=%s"+!!(toys.optflags&FLAG_Z), context);
155      if (CFG_TOYBOX_FREE) free(context);
156    } else if (toys.optflags&FLAG_Z) error_exit("%s disabled", lsm_name());
157  }
158
159  xputc('\n');
160}
161
162void id_main(void)
163{
164  if (toys.optc) while(*toys.optargs) do_id(*toys.optargs++);
165  else do_id(NULL);
166}
167
168void groups_main(void)
169{
170  TT.is_groups = 1;
171  toys.optflags = FLAG_G|FLAG_n;
172  id_main();
173}
174
175void logname_main(void)
176{
177  toys.optflags = FLAG_u|FLAG_n;
178  id_main();
179}
180