diff options
Diffstat (limited to 'addgroup.c')
| -rw-r--r-- | addgroup.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/addgroup.c b/addgroup.c new file mode 100644 index 0000000..3d93201 --- /dev/null +++ b/addgroup.c @@ -0,0 +1,178 @@ +/* vi: set sw=4 ts=4: */ +/* + * addgroup - add users to /etc/passwd and /etc/shadow + * + * + * Copyright (C) 1999 by Lineo, inc. + * Written by John Beppu <beppu@lineo.com> + * + * 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_grp/pwd.h" +#include "pwd_grp/grp.h" + +#define GROUP_FILE "/etc/group" +#define SHADOW_FILE "/etc/gshadow" + + +/* structs __________________________ */ + +/* data _____________________________ */ + +/* defaults : should this be in an external file? */ +static 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; + + /* FIXME : make an fopen_wrapper */ + etc_group = fopen(filename, "r"); + if (!etc_group) { + perror_msg_and_die("%s", filename); + } + + /* 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; + FILE *etc_gshadow; + char *gshadow = SHADOW_FILE; + + struct group gr; + + /* group:passwd:gid:userlist */ + 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 = fopen(filename, "a"); + if (!etc_group) { + perror_msg_and_die("%s", filename); + } + fprintf(etc_group, entryfmt, group, default_passwd, gr.gr_gid, ""); + fclose(etc_group); + + /* 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); + } + + /* 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 i; + char opt; + char *group; + gid_t gid = 0; + + /* get remaining args */ + for (i = 1; i < argc; i++) { + if (argv[i][0] == '-') { + opt = argv[i][1]; + switch (opt) { + case 'h': + show_usage(); + break; + case 'g': + gid = strtol(argv[++i], NULL, 10); + break; + default: + error_msg_and_die("addgroup: invalid option -- %c\n", opt); + } + } else { + break; + } + } + + if (i >= argc) { + show_usage(); + } else { + group = argv[i]; + } + + if (geteuid() != 0) { + error_msg_and_die + ("addgroup: Only root may add a group to the system.\n"); + } + + /* werk */ + return addgroup(GROUP_FILE, group, gid); +} + +/* $Id: addgroup.c,v 1.1 2001/08/21 16:18:59 andersen Exp $ */ |