1 /* groupadd.c - create a new group
2 *
3 * Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com>
4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
5 *
6 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/groupadd.html
7
8 USE_GROUPADD(NEWTOY(groupadd, "<1>2g#<0S", TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
9 USE_GROUPADD(OLDTOY(addgroup, groupadd, TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
10
11 config GROUPADD
12 bool "groupadd"
13 default n
14 help
15 usage: groupadd [-S] [-g GID] [USER] GROUP
16
17 Add a group or add a user to a group
18
19 -g GID Group id
20 -S Create a system group
21 */
22
23 #define FOR_groupadd
24 #include "toys.h"
25
26 #define GROUP_PATH "/etc/group"
27 #define SECURE_GROUP_PATH "/etc/gshadow"
28
GLOBALS(long gid;)29 GLOBALS(
30 long gid;
31 )
32
33 /* Add a new group to the system, if GID is given then that is validated
34 * to be free, else a free GID is choosen by self.
35 * SYSTEM IDs are considered in the range 100 ... 999
36 * update_group(), updates the entries in /etc/group, /etc/gshadow files
37 */
38 static void new_group()
39 {
40 char *entry = NULL;
41
42 if (toys.optflags & FLAG_g) {
43 if (TT.gid > INT_MAX) error_exit("gid should be less than '%d' ", INT_MAX);
44 if (getgrgid(TT.gid)) error_exit("group '%ld' is in use", TT.gid);
45 } else {
46 if (toys.optflags & FLAG_S) TT.gid = CFG_TOYBOX_UID_SYS;
47 else TT.gid = CFG_TOYBOX_UID_USR;
48 //find unused gid
49 while (getgrgid(TT.gid)) TT.gid++;
50 }
51
52 entry = xmprintf("%s:%s:%d:", *toys.optargs, "x", TT.gid);
53 update_password(GROUP_PATH, *toys.optargs, entry);
54 free(entry);
55 entry = xmprintf("%s:%s::", *toys.optargs, "!");
56 update_password(SECURE_GROUP_PATH, *toys.optargs, entry);
57 free(entry);
58 }
59
groupadd_main(void)60 void groupadd_main(void)
61 {
62 struct group *grp = NULL;
63 char *entry = NULL;
64
65 if (toys.optflags && toys.optc == 2) {
66 toys.exithelp = 1;
67 error_exit("options, user and group can't be together");
68 }
69
70 if (toys.optc == 2) { //add user to group
71 //toys.optargs[0]- user, toys.optargs[1] - group
72 xgetpwnam(*toys.optargs);
73 if (!(grp = getgrnam(toys.optargs[1])))
74 error_exit("group '%s' does not exist", toys.optargs[1]);
75 if (!grp->gr_mem) entry = xmprintf("%s", *toys.optargs);
76 else {
77 int i;
78
79 for (i = 0; grp->gr_mem[i]; i++)
80 if (!strcmp(grp->gr_mem[i], *toys.optargs)) return;
81
82 entry = xstrdup("");
83 for (i=0; grp->gr_mem[i]; i++) {
84 entry = xrealloc(entry, strlen(entry) + strlen(grp->gr_mem[i]) + 2);
85 strcat(entry, grp->gr_mem[i]);
86 strcat(entry, ",");
87 }
88 entry = xrealloc(entry, strlen(entry) + strlen(*toys.optargs) + 1);
89 strcat(entry, *toys.optargs);
90 }
91 update_password(GROUP_PATH, grp->gr_name, entry);
92 update_password(SECURE_GROUP_PATH, grp->gr_name, entry);
93 free(entry);
94 } else { //new group to be created
95 char *s = *toys.optargs;
96
97 /* investigate the group to be created */
98 if (getgrnam(s)) error_exit("'%s' in use", s);
99 if (s[strcspn(s, ":/\n")] || strlen(s) > LOGIN_NAME_MAX)
100 error_exit("bad name");
101 new_group();
102 }
103 }
104