1 /* id.c - print real and effective user and group IDs
3 * Copyright 2012 Sony Network Entertainment, Inc.
5 * by Tim Bird <tim.bird@am.sony.com>
7 * See http://opengroup.org/onlinepubs/9699919799/utilities/id.html
9 USE_ID(NEWTOY(id, ">1nGgru[!Ggu]", TOYFLAG_BIN))
10 USE_ID_GROUPS(OLDTOY(groups, id, NULL, TOYFLAG_USR|TOYFLAG_BIN))
18 Print user and group ID.
20 -n print names instead of numeric IDs (to be used with -Ggu)
21 -G Show only the group IDs
22 -g Show only the effective group ID
23 -r Show real ID instead of effective ID
24 -u Show only the effective user ID
33 Print the groups a user is in.
40 static void s_or_u(char *s, unsigned u, int done)
42 if (toys.optflags & FLAG_n) printf("%s", s);
50 static void showid(char *header, unsigned u, char *s)
52 printf("%s%u(%s)", header, u, s);
55 struct passwd *xgetpwuid(uid_t uid)
57 struct passwd *pwd = getpwuid(uid);
58 if (!pwd) error_exit(NULL);
62 struct group *xgetgrgid(gid_t gid)
64 struct group *group = getgrgid(gid);
65 if (!group) error_exit(NULL);
69 void do_id(char *username)
71 int flags, i, ngroups, cmd_groups = toys.which->name[0] == 'g';
74 uid_t uid = getuid(), euid = geteuid();
75 gid_t gid = getgid(), egid = getegid(), *groups;
78 toys.optflags |= FLAG_G | FLAG_n;
80 flags = toys.optflags;
82 // check if a username is given
84 if (!(pw = getpwnam(username)))
85 error_exit("no such user '%s'", username);
86 uid = euid = pw->pw_uid;
87 gid = egid = pw->pw_gid;
89 printf("%s : ", pw->pw_name);
93 pw = xgetpwuid(i ? uid : euid);
94 if (flags & FLAG_u) s_or_u(pw->pw_name, pw->pw_uid, 1);
96 grp = xgetgrgid(i ? gid : egid);
97 if (flags & FLAG_g) s_or_u(grp->gr_name, grp->gr_gid, 1);
99 if (!(flags & FLAG_G)) {
100 showid("uid=", pw->pw_uid, pw->pw_name);
101 showid(" gid=", grp->gr_gid, grp->gr_name);
105 pw = xgetpwuid(euid);
106 showid(" euid=", pw->pw_uid, pw->pw_name);
109 grp = xgetgrgid(egid);
110 showid(" egid=", grp->gr_gid, grp->gr_name);
114 showid(" groups=", grp->gr_gid, grp->gr_name);
117 groups = (gid_t *)toybuf;
118 i = sizeof(toybuf)/sizeof(gid_t);
119 ngroups = username ? getgrouplist(username, gid, groups, &i)
120 : getgroups(i, groups);
121 if (0 >= ngroups) perror_exit(0);
124 if (!(grp = getgrgid(groups[i]))) perror_msg(0);
125 else if (flags & FLAG_G) s_or_u(grp->gr_name, grp->gr_gid, 0);
126 else if (grp->gr_gid != egid) showid("", grp->gr_gid, grp->gr_name);
127 if (++i >= ngroups) break;
135 if (toys.optc) while(*toys.optargs) do_id(*toys.optargs++);