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
9 USE_ID(NEWTOY(id, ">1"USE_ID_Z("Z")"nGgru[!"USE_ID_Z("Z")"Ggu]", TOYFLAG_USR|TOYFLAG_BIN))
10 USE_GROUPS(NEWTOY(groups, NULL, TOYFLAG_USR|TOYFLAG_BIN))
11 USE_LOGNAME(NEWTOY(logname, ">0", TOYFLAG_USR|TOYFLAG_BIN))
12 USE_WHOAMI(OLDTOY(whoami, logname, TOYFLAG_USR|TOYFLAG_BIN))
13
14 config ID
15 bool "id"
16 default y
17 help
18 usage: id [-nGgru] [USER...]
19
20 Print user and group ID.
21
22 -G Show all group IDs
23 -g Show only the effective group ID
24 -n Print names instead of numeric IDs (to be used with -Ggu)
25 -r Show real ID instead of effective ID
26 -u Show only the effective user ID
27
28 config 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
37 config GROUPS
38 bool "groups"
39 default y
40 help
41 usage: groups [user]
42
43 Print the groups a user is in.
44
45 config LOGNAME
46 bool "logname"
47 default y
48 help
49 usage: logname
50
51 Print the current user name.
52
53 config 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
GLOBALS(int is_groups;)66 GLOBALS(
67 int is_groups;
68 )
69
70 static void showone(char *prefix, char *s, unsigned u, int done)
71 {
72 if (FLAG(n)) printf("%s%s", prefix, s);
73 else printf("%s%u", prefix, u);
74 if (done) {
75 xputc('\n');
76 xexit();
77 }
78 }
79
showid(char * prefix,unsigned u,char * s)80 static void showid(char *prefix, unsigned u, char *s)
81 {
82 printf("%s%u(%s)", prefix, u, s);
83 }
84
do_id(char * username)85 static void do_id(char *username)
86 {
87 struct passwd *pw;
88 struct group *grp;
89 uid_t uid = getuid(), euid = geteuid();
90 gid_t gid = getgid(), egid = getegid();
91 gid_t *groups = (gid_t *)toybuf;
92 int i = sizeof(toybuf)/sizeof(gid_t), ngroups;
93
94 // check if a username is given
95 if (username) {
96 pw = getpwnam(username);
97 if (!pw) {
98 uid = atolx_range(username, 0, INT_MAX);
99 if ((pw = getpwuid(uid))) username = pw->pw_name;
100 }
101 if (!pw) error_exit("no such user '%s'", username);
102 uid = euid = pw->pw_uid;
103 gid = egid = pw->pw_gid;
104 if (TT.is_groups) printf("%s : ", pw->pw_name);
105 }
106
107 pw = xgetpwuid(FLAG(r) ? uid : euid);
108 if (FLAG(u)) showone("", pw->pw_name, pw->pw_uid, 1);
109
110 grp = xgetgrgid(FLAG(r) ? gid : egid);
111 if (FLAG(g)) showone("", grp->gr_name, grp->gr_gid, 1);
112
113 ngroups = username ? getgrouplist(username, gid, groups, &i)
114 : getgroups(i, groups);
115 if (ngroups<0) perror_exit("getgroups");
116
117 if (FLAG(G)) {
118 showone("", grp->gr_name, grp->gr_gid, 0);
119 for (i = 0; i<ngroups; i++) {
120 if (groups[i] != egid) {
121 if ((grp=getgrgid(groups[i]))) showone(" ",grp->gr_name,grp->gr_gid,0);
122 else printf(" %u", groups[i]);
123 }
124 }
125 xputc('\n');
126 return;
127 }
128
129 if (!FLAG(Z)) {
130 showid("uid=", pw->pw_uid, pw->pw_name);
131 showid(" gid=", grp->gr_gid, grp->gr_name);
132
133 if (!FLAG(r)) {
134 if (uid != euid) {
135 pw = xgetpwuid(euid);
136 showid(" euid=", pw->pw_uid, pw->pw_name);
137 }
138 if (gid != egid) {
139 grp = xgetgrgid(egid);
140 showid(" egid=", grp->gr_gid, grp->gr_name);
141 }
142 }
143
144 showid(" groups=", gid, grp->gr_name);
145 for (i = 0; i<ngroups; i++) {
146 if (groups[i] != egid) {
147 if ((grp=getgrgid(groups[i]))) showid(",", grp->gr_gid, grp->gr_name);
148 else printf(",%u", groups[i]);
149 }
150 }
151 }
152
153 if (!CFG_TOYBOX_LSM_NONE) {
154 if (lsm_enabled()) {
155 char *context = lsm_context();
156
157 printf("%s%s", FLAG(Z) ? "" : " context=", context);
158 if (CFG_TOYBOX_FREE) free(context);
159 } else if (FLAG(Z)) error_exit("%s disabled", lsm_name());
160 }
161
162 xputc('\n');
163 }
164
id_main(void)165 void id_main(void)
166 {
167 if (toys.optc) while(*toys.optargs) do_id(*toys.optargs++);
168 else do_id(NULL);
169 }
170
groups_main(void)171 void groups_main(void)
172 {
173 TT.is_groups = 1;
174 toys.optflags = FLAG_G|FLAG_n;
175 id_main();
176 }
177
logname_main(void)178 void logname_main(void)
179 {
180 toys.optflags = FLAG_u|FLAG_n;
181 id_main();
182 }
183