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
8USE_GROUPADD(NEWTOY(groupadd, "<1>2g#<0S", TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
9USE_GROUPADD(OLDTOY(addgroup, groupadd, TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
10
11config 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
29GLOBALS(
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 */
38static 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
60void 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