freebsd-dev/usr.sbin/pw/pw.c

/*-
 * Copyright (C) 1996
 *	David L. Nugent.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
	"$Id: pw.c,v 1.8 1998/07/16 17:18:25 nate Exp $";
#endif /* not lint */

#include "pw.h"
#include <err.h>
#include <fcntl.h>
#include <paths.h>
#include <sys/wait.h>

const char     *Modes[] = {"add", "del", "mod", "show", "next", NULL};
const char     *Which[] = {"user", "group", NULL};
static const char *Combo1[] = {
  "useradd", "userdel", "usermod", "usershow", "usernext",
  "groupadd", "groupdel", "groupmod", "groupshow", "groupnext",
  NULL};
static const char *Combo2[] = {
  "adduser", "deluser", "moduser", "showuser", "nextuser",
  "addgroup", "delgroup", "modgroup", "showgroup", "nextgroup",
NULL};

static struct cargs arglist;

static int      getindex(const char *words[], const char *word);
static void     cmdhelp(int mode, int which);
static void     filelock(const char *filename);


int
main(int argc, char *argv[])
{
	int             ch;
	int             mode = -1;
	int             which = -1;
	struct userconf *cnf;

	static const char *opts[W_NUM][M_NUM] =
	{
		{ /* user */
			"C:qn:u:c:d:e:p:g:G:mk:s:oL:i:w:h:Db:NPy:Y",
			"C:qn:u:rY",
			"C:qn:u:c:d:e:p:g:G:ml:k:s:w:L:h:FNPY",
			"C:qn:u:FPa",
			"C:q"
		},
		{ /* grp  */
			"C:qn:g:h:M:pNPY",
			"C:qn:g:Y",
			"C:qn:g:l:h:FM:m:NPY",
			"C:qn:g:FPa",
			"C:q"
		 }
	};

	static int      (*funcs[W_NUM]) (struct userconf * _cnf, int _mode, struct cargs * _args) =
	{			/* Request handlers */
		pw_user,
		pw_group
	};

	umask(0);		/* We wish to handle this manually */
	LIST_INIT(&arglist);

	/*
	 * Break off the first couple of words to determine what exactly
	 * we're being asked to do
	 */
	while (argc > 1 && *argv[1] != '-') {
		int             tmp;

		if ((tmp = getindex(Modes, argv[1])) != -1)
			mode = tmp;
		else if ((tmp = getindex(Which, argv[1])) != -1)
			which = tmp;
		else if ((tmp = getindex(Combo1, argv[1])) != -1 || (tmp = getindex(Combo2, argv[1])) != -1) {
			which = tmp / M_NUM;
			mode = tmp % M_NUM;
		} else if (strcmp(argv[1], "help") == 0)
			cmdhelp(mode, which);
		else if (which != -1 && mode != -1 && arglist.lh_first == NULL)
			addarg(&arglist, 'n', argv[1]);
		else
			errx(EX_USAGE, "unknown keyword `%s'", argv[1]);
		++argv;
		--argc;
	}

	/*
	 * Bail out unless the user is specific!
	 */
	if (mode == -1 || which == -1)
		cmdhelp(mode, which);

	/*
	 * We know which mode we're in and what we're about to do, so now
	 * let's dispatch the remaining command line args in a genric way.
	 */
	optarg = NULL;

	while ((ch = getopt(argc, argv, opts[which][mode])) != -1) {
		if (ch == '?')
			errx(EX_USAGE, NULL);
		else
			addarg(&arglist, ch, optarg);
		optarg = NULL;
	}

	/*
	 * Must be root to attempt an update
	 */
	if (geteuid() != 0 && mode != M_PRINT && mode != M_NEXT && getarg(&arglist, 'N')==NULL)
		errx(EX_NOPERM, "you must be root to run this program");

	/*
	 * We should immediately look for the -q 'quiet' switch so that we
	 * don't bother with extraneous errors
	 */
	if (getarg(&arglist, 'q') != NULL)
		freopen("/dev/null", "w", stderr);

	/*
	 * Now, let's do the common initialisation
	 */
	cnf = read_userconfig(getarg(&arglist, 'C') ? getarg(&arglist, 'C')->val : NULL);

	/*
	 * Try to lock the master passowrd and group files right away (we
	 * don't care if it works, since this is just advisory locking.
	 */
	filelock(_PATH_GROUP);
	filelock(_PATH_MASTERPASSWD);
	ch = funcs[which] (cnf, mode, &arglist);

	/*
	 * If everything went ok, and we've been asked to update
	 * the NIS maps, then do it now
	 */
	if (ch == EXIT_SUCCESS && getarg(&arglist, 'Y') != NULL) {
		pid_t	pid;

		fflush(NULL);
		if (chdir(_PATH_YP) == -1)
			warn("chdir(" _PATH_YP ")");
		else if ((pid = fork()) == -1)
			warn("fork()");
		else if (pid == 0) {
			/* Is make anywhere else? */
			execlp("/usr/bin/make", "make", NULL);
			_exit(1);
		} else {
			int   i;
			waitpid(pid, &i, 0);
			if ((i = WEXITSTATUS(i)) != 0)
				errx(ch, "make exited with status %d", i);
			else
				pw_log(cnf, mode, which, "NIS maps updated");
		}
	}
	return ch;
}

static void
filelock(const char *filename)
{
	open(filename, O_RDONLY | O_EXLOCK, 0);
}

static int
getindex(const char *words[], const char *word)
{
	int             i = 0;

	while (words[i]) {
		if (strcmp(words[i], word) == 0)
			return i;
		i++;
	}
	return -1;
}


/*
 * This is probably an overkill for a cmdline help system, but it reflects
 * the complexity of the command line.
 */

static void
cmdhelp(int mode, int which)
{
	if (which == -1)
		fprintf(stderr, "usage: pw [user|group] [add|del|mod|show|next] [ help | switches/values ]\n");
	else if (mode == -1)
		fprintf(stderr, "usage: pw %s [add|del|mod|show|next] [ help | switches/values ]\n", Which[which]);
	else {

		/*
		 * We need to give mode specific help
		 */
		static const char *help[W_NUM][M_NUM] =
		{
			{
				"usage: pw useradd [name] [switches]\n"
				"\t-C config      configuration file\n"
				"\t-q             quiet operation\n"
				"  Adding users:\n"
				"\t-n name        login name\n"
				"\t-u uid         user id\n"
				"\t-c comment     user name/comment\n"
				"\t-d directory   home directory\n"
				"\t-e date        account expiry date\n"
				"\t-p date        password expiry date\n"
				"\t-g grp         initial group\n"
				"\t-G grp1,grp2   additional groups\n"
				"\t-m [ -k dir ]  create and set up home\n"
				"\t-s shell       name of login shell\n"
				"\t-o             duplicate uid ok\n"
				"\t-L class       user class\n"
				"\t-h fd          read password on fd\n"
				"\t-Y             update NIS maps\n"
				"\t-N             no update\n"
				"  Setting defaults:\n"
				"\t-D             set user defaults\n"
				"\t-b dir         default home root dir\n"
				"\t-e period      default expiry period\n"
				"\t-p period      default password change period\n"
				"\t-g group       default group\n"
				"\t-G grp1,grp2   additional groups\n"
				"\t-L class       default user class\n"
				"\t-k dir         default home skeleton\n"
				"\t-u min,max     set min,max uids\n"
				"\t-i min,max     set min,max gids\n"
				"\t-w method      set default password method\n"
				"\t-s shell       default shell\n"
				"\t-y path        set NIS passwd file path\n",
				"usage: pw userdel [uid|name] [switches]\n"
				"\t-n name        login name\n"
				"\t-u uid         user id\n"
				"\t-Y             update NIS maps\n"
				"\t-r             remove home & contents\n",
				"usage: pw usermod [uid|name] [switches]\n"
				"\t-C config      configuration file\n"
				"\t-q             quiet operation\n"
				"\t-F             force add if no user\n"
				"\t-n name        login name\n"
				"\t-u uid         user id\n"
				"\t-c comment     user name/comment\n"
				"\t-d directory   home directory\n"
				"\t-e date        account expiry date\n"
				"\t-p date        password expiry date\n"
				"\t-g grp         initial group\n"
				"\t-G grp1,grp2   additional groups\n"
				"\t-l name        new login name\n"
				"\t-L class       user class\n"
				"\t-m [ -k dir ]  create and set up home\n"
				"\t-s shell       name of login shell\n"
				"\t-w method      set new password using method\n"
				"\t-h fd          read password on fd\n"
				"\t-Y             update NIS maps\n"
				"\t-N             no update\n",
				"usage: pw usershow [uid|name] [switches]\n"
				"\t-n name        login name\n"
				"\t-u uid         user id\n"
				"\t-F             force print\n"
				"\t-P             prettier format\n"
				"\t-a             print all users\n",
				"usage: pw usernext [switches]\n"
				"\t-C config      configuration file\n"
			},
			{
				"usage: pw groupadd [group|gid] [switches]\n"
				"\t-C config      configuration file\n"
				"\t-q             quiet operation\n"
				"\t-n group       group name\n"
				"\t-g gid         group id\n"
				"\t-M usr1,usr2   add users as group members\n"
				"\t-o             duplicate gid ok\n"
				"\t-Y             update NIS maps\n"
				"\t-N             no update\n",
				"usage: pw groupdel [group|gid] [switches]\n"
				"\t-n name        group name\n"
				"\t-g gid         group id\n"
				"\t-Y             update NIS maps\n",
				"usage: pw groupmod [group|gid] [switches]\n"
				"\t-C config      configuration file\n"
				"\t-q             quiet operation\n"
				"\t-F             force add if not exists\n"
				"\t-n name        group name\n"
				"\t-g gid         group id\n"
				"\t-M usr1,usr2   replaces users as group members\n"
				"\t-m usr1,usr2   add users as group members\n"
				"\t-l name        new group name\n"
				"\t-Y             update NIS maps\n"
				"\t-N             no update\n",
				"usage: pw groupshow [group|gid] [switches]\n"
				"\t-n name        group name\n"
				"\t-g gid         group id\n"
				"\t-F             force print\n"
				"\t-P             prettier format\n"
				"\t-a             print all accounting groups\n",
				"usage: pw groupnext [switches]\n"
				"\t-C config      configuration file\n"
			}
		};

		fprintf(stderr, help[which][mode]);
	}
	exit(EXIT_FAILURE);
}

struct carg    *
getarg(struct cargs * _args, int ch)
{
	struct carg    *c = _args->lh_first;

	while (c != NULL && c->ch != ch)
		c = c->list.le_next;
	return c;
}

struct carg    *
addarg(struct cargs * _args, int ch, char *argstr)
{
	struct carg    *ca = malloc(sizeof(struct carg));

	if (ca == NULL)
		errx(EX_OSERR, "out of memory");
	ca->ch = ch;
	ca->val = argstr;
	LIST_INSERT_HEAD(_args, ca, list);
	return ca;
}