source: branches/stable/mindi-busybox/loginutils/addgroup.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * addgroup - add users to /etc/passwd and /etc/shadow
4 *
5 * Copyright (C) 1999 by Lineo, inc. and John Beppu
6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9 *
10 */
11
12#include <stdio.h>
13#include <string.h>
14#include <sys/types.h>
15#include <unistd.h>
16
17#include "busybox.h"
18
19/* make sure gr_name isn't taken, make sure gid is kosher
20 * return 1 on failure */
21static int group_study(struct group *g)
22{
23    FILE *etc_group;
24    gid_t desired;
25
26    struct group *grp;
27    const int max = 65000;
28
29    etc_group = bb_xfopen(bb_path_group_file, "r");
30
31    /* make sure gr_name isn't taken, make sure gid is kosher */
32    desired = g->gr_gid;
33    while ((grp = fgetgrent(etc_group))) {
34        if ((strcmp(grp->gr_name, g->gr_name)) == 0) {
35            bb_error_msg_and_die("%s: group already in use", g->gr_name);
36        }
37        if ((desired) && grp->gr_gid == desired) {
38            bb_error_msg_and_die("%d: gid already in use",
39                              desired);
40        }
41        if ((grp->gr_gid > g->gr_gid) && (grp->gr_gid < max)) {
42            g->gr_gid = grp->gr_gid;
43        }
44    }
45    fclose(etc_group);
46
47    /* gid */
48    if (desired) {
49        g->gr_gid = desired;
50    } else {
51        g->gr_gid++;
52    }
53    /* return 1; */
54    return 0;
55}
56
57/* append a new user to the passwd file */
58static int addgroup(char *group, gid_t gid, const char *user)
59{
60    FILE *file;
61    struct group gr;
62
63    /* make sure gid and group haven't already been allocated */
64    gr.gr_gid = gid;
65    gr.gr_name = group;
66    if (group_study(&gr))
67        return 1;
68
69    /* add entry to group */
70    file = bb_xfopen(bb_path_group_file, "a");
71    /* group:passwd:gid:userlist */
72    fprintf(file, "%s:%s:%d:%s\n", group, "x", gr.gr_gid, user);
73    fclose(file);
74
75#if ENABLE_FEATURE_SHADOWPASSWDS
76    file = bb_xfopen(bb_path_gshadow_file, "a");
77    fprintf(file, "%s:!::\n", group);
78    fclose(file);
79#endif
80
81    /* return 1; */
82    return 0;
83}
84
85/*
86 * addgroup will take a login_name as its first parameter.
87 *
88 * gid
89 *
90 * can be customized via command-line parameters.
91 * ________________________________________________________________________ */
92int addgroup_main(int argc, char **argv)
93{
94    char *group;
95    gid_t gid = 0;
96   
97    /* check for min, max and missing args and exit on error */
98    bb_opt_complementally = "-1:?2:?";
99
100    if (bb_getopt_ulflags(argc, argv, "g:", &group)) {
101        gid = bb_xgetlarg(group, 10, 0, LONG_MAX);
102    }
103    /* move past the commandline options */
104    argv += optind;
105
106    /* need to be root */
107    if(geteuid()) {
108        bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
109    }
110
111    /* werk */
112    return addgroup(argv[0], gid, (argv[1]) ? argv[1] : "");
113}
Note: See TracBrowser for help on using the repository browser.