| /* vi: set sw=4 ts=4: */ |
| /* |
| * addgroup - add users to /etc/passwd and /etc/shadow |
| * |
| * Copyright (C) 1999 by Lineo, inc. and John Beppu |
| * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/param.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include "busybox.h" |
| #include "pwd.h" |
| #include "grp.h" |
| |
| #define GROUP_FILE "/etc/group" |
| #define SHADOW_FILE "/etc/gshadow" |
| |
| |
| /* structs __________________________ */ |
| |
| /* data _____________________________ */ |
| |
| /* defaults : should this be in an external file? */ |
| static const char default_passwd[] = "x"; |
| |
| |
| /* make sure gr_name isn't taken, make sure gid is kosher |
| * return 1 on failure */ |
| static int group_study(const char *filename, struct group *g) |
| { |
| FILE *etc_group; |
| gid_t desired; |
| |
| struct group *grp; |
| const int max = 65000; |
| |
| etc_group = xfopen(filename, "r"); |
| |
| /* make sure gr_name isn't taken, make sure gid is kosher */ |
| desired = g->gr_gid; |
| while ((grp = fgetgrent(etc_group))) { |
| if ((strcmp(grp->gr_name, g->gr_name)) == 0) { |
| error_msg_and_die("%s: group already in use\n", g->gr_name); |
| } |
| if ((desired) && grp->gr_gid == desired) { |
| error_msg_and_die("%d: gid has already been allocated\n", |
| desired); |
| } |
| if ((grp->gr_gid > g->gr_gid) && (grp->gr_gid < max)) { |
| g->gr_gid = grp->gr_gid; |
| } |
| } |
| fclose(etc_group); |
| |
| /* gid */ |
| if (desired) { |
| g->gr_gid = desired; |
| } else { |
| g->gr_gid++; |
| } |
| /* return 1; */ |
| return 0; |
| } |
| |
| /* append a new user to the passwd file */ |
| static int addgroup(const char *filename, char *group, gid_t gid) |
| { |
| FILE *etc_group; |
| |
| #ifdef CONFIG_FEATURE_SHADOWPASSWDS |
| FILE *etc_gshadow; |
| char *gshadow = SHADOW_FILE; |
| #endif |
| |
| struct group gr; |
| |
| /* group:passwd:gid:userlist */ |
| static const char entryfmt[] = "%s:%s:%d:%s\n"; |
| |
| /* make sure gid and group haven't already been allocated */ |
| gr.gr_gid = gid; |
| gr.gr_name = group; |
| if (group_study(filename, &gr)) |
| return 1; |
| |
| /* add entry to group */ |
| etc_group = xfopen(filename, "a"); |
| |
| fprintf(etc_group, entryfmt, group, default_passwd, gr.gr_gid, ""); |
| fclose(etc_group); |
| |
| |
| #ifdef CONFIG_FEATURE_SHADOWPASSWDS |
| /* add entry to gshadow if necessary */ |
| if (access(gshadow, F_OK|W_OK) == 0) { |
| etc_gshadow = xfopen(gshadow, "a"); |
| fprintf(etc_gshadow, "%s:!::\n", group); |
| fclose(etc_gshadow); |
| } |
| #endif |
| |
| /* return 1; */ |
| return 0; |
| } |
| |
| /* |
| * addgroup will take a login_name as its first parameter. |
| * |
| * gid |
| * |
| * can be customized via command-line parameters. |
| * ________________________________________________________________________ */ |
| int addgroup_main(int argc, char **argv) |
| { |
| int opt; |
| char *group; |
| gid_t gid = 0; |
| |
| /* get remaining args */ |
| while ((opt = getopt (argc, argv, "g:")) != -1) |
| switch (opt) { |
| case 'g': |
| gid = strtol(optarg, NULL, 10); |
| break; |
| default: |
| show_usage(); |
| break; |
| } |
| |
| if (optind >= argc) { |
| show_usage(); |
| } else { |
| group = argv[optind]; |
| } |
| |
| if (geteuid() != 0) { |
| error_msg_and_die |
| ("Only root may add a group to the system."); |
| } |
| |
| /* werk */ |
| return addgroup(GROUP_FILE, group, gid); |
| } |
| |
| /* $Id: addgroup.c,v 1.1 2002/06/04 20:45:05 sandman Exp $ */ |