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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: edit.c,v 1.33 2009/10/27 23:59:36 deraadt Exp $	*/
/*	$NetBSD: edit.c,v 1.6 1996/05/15 21:50:45 jtc Exp $	*/

/*-
 * Copyright (c) 1990, 1993, 1994
 *	The Regents of the University of California.  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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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.
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

#include "chpass.h"

int
edit(char *tempname, struct passwd *pw)
{
	struct stat begin, end;

	for (;;) {
		if (lstat(tempname, &begin) == -1 || S_ISLNK(begin.st_mode))
			return (EDIT_ERROR);
		pw_edit(1, tempname);
		if (lstat(tempname, &end) == -1 || S_ISLNK(end.st_mode))
			return (EDIT_ERROR);
		if (!timespeccmp(&begin.st_mtimespec, &end.st_mtimespec, -) &&
		    begin.st_size == end.st_size) {
			warnx("no changes made");
			return (EDIT_NOCHANGE);
		}
		if (verify(tempname, pw))
			break;
		pw_prompt();
	}
	return(EDIT_OK);
}

/*
 * display --
 *	print out the file for the user to edit; strange side-effect:
 *	set conditional flag if the user gets to edit the shell.
 */
void
display(char *tempname, int fd, struct passwd *pw)
{
	FILE *fp;
	char *bp, *p;
	char chngstr[256];

	if (!(fp = fdopen(fd, "w")))
		pw_error(tempname, 1, 1);

	(void)fprintf(fp,
	    "# Changing user database information for %s.\n", pw->pw_name);
	if (!uid) {
		(void)fprintf(fp, "Login: %s\n", pw->pw_name);
		(void)fprintf(fp, "Encrypted password: %s\n", pw->pw_passwd);
		(void)fprintf(fp, "Uid [#]: %u\n", pw->pw_uid);
		(void)fprintf(fp, "Gid [# or name]: %u\n", pw->pw_gid);
		(void)fprintf(fp, "Change [month day year]: %s\n",
		    ttoa(chngstr, sizeof(chngstr), pw->pw_change));
		(void)fprintf(fp, "Expire [month day year]: %s\n",
		    ttoa(chngstr, sizeof(chngstr), pw->pw_expire));
		(void)fprintf(fp, "Class: %s\n", pw->pw_class);
		(void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
		(void)fprintf(fp, "Shell: %s\n",
		    *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
	}
	/* Only admin can change "restricted" shells. */
	else if (ok_shell(pw->pw_shell, NULL))
		/*
		 * Make shell a restricted field.  Ugly with a
		 * necklace, but there's not much else to do.
		 */
		(void)fprintf(fp, "Shell: %s\n",
		    *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
	else
		list[E_SHELL].restricted = 1;
	bp = pw->pw_gecos;
	p = strsep(&bp, ",");
	(void)fprintf(fp, "Full Name: %s\n", p ? p : "");
	p = strsep(&bp, ",");
	(void)fprintf(fp, "Office Location: %s\n", p ? p : "");
	p = strsep(&bp, ",");
	(void)fprintf(fp, "Office Phone: %s\n", p ? p : "");
	p = strsep(&bp, ",");
	(void)fprintf(fp, "Home Phone: %s\n", p ? p : "");

	(void)fchown(fd, getuid(), getgid());
	(void)fclose(fp);
}

int
verify(char *tempname, struct passwd *pw)
{
	unsigned int line;
	size_t alen;
	static char buf[LINE_MAX];
	struct stat sb;
	char *p, *q;
	ENTRY *ep;
	FILE *fp;
	int fd;

	if ((fd = open(tempname, O_RDONLY|O_NOFOLLOW)) == -1 ||
	    (fp = fdopen(fd, "r")) == NULL)
		pw_error(tempname, 1, 1);
	if (fstat(fd, &sb))
		pw_error(tempname, 1, 1);
	if (sb.st_size == 0 || sb.st_nlink != 1 || sb.st_uid != uid) {
		warnx("corrupted temporary file");
		goto bad;
	}
	line = 0;
	while (fgets(buf, sizeof(buf), fp)) {
		line++;
		if (!buf[0] || buf[0] == '#')
			continue;
		if ((p = strchr(buf, '\n')) != NULL)
			*p = '\0';
		else if (!feof(fp)) {
			warnx("line %u too long", line);
			goto bad;
		}
		for (ep = list;; ++ep) {
			if (!ep->prompt) {
				warnx("unrecognized field on line %u", line);
				goto bad;
			}
			if (!strncasecmp(buf, ep->prompt, ep->len)) {
				if (ep->restricted && uid) {
					warnx(
					    "you may not change the %s field",
						ep->prompt);
					goto bad;
				}
				if (!(p = strchr(buf, ':'))) {
					warnx("line %u corrupted", line);
					goto bad;
				}
				while (isspace(*++p));
				for (q = p; isprint(*q); q++) {
					if (ep->except && strchr(ep->except,*q))
						break;
				}
				if (*q) {
					warnx(
				   "illegal character in the \"%s\" field",
					    ep->prompt);
					goto bad;
				}
				if ((ep->func)(p, pw, ep)) {
bad:					(void)fclose(fp);
					return (0);
				}
				break;
			}
		}
	}
	(void)fclose(fp);

	if (list[E_NAME].save == NULL)
		list[E_NAME].save = "";
	if (list[E_BPHONE].save == NULL)
		list[E_BPHONE].save = "";
	if (list[E_HPHONE].save == NULL)
		list[E_HPHONE].save = "";
	if (list[E_LOCATE].save == NULL)
		list[E_LOCATE].save = "";

	/* Build the gecos field. */
	for (alen = 0, p = list[E_NAME].save; *p; p++)
		if (*p == '&')
			alen = alen + strlen(pw->pw_name) - 1;
	if (asprintf(&p, "%s,%s,%s,%s", list[E_NAME].save,
	    list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save) == -1)
		err(1, NULL);
	pw->pw_gecos = p;

	if (snprintf(buf, sizeof(buf),
	    "%s:%s:%u:%u:%s:%ld:%ld:%s:%s:%s",
	    pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
	    (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos, pw->pw_dir,
	    pw->pw_shell) >= 1023 ||
	    strlen(buf) + alen >= 1023) {
		warnx("entries too long");
		free(p);
		return (0);
	}
	free(p);

	return (pw_scan(buf, pw, NULL));
}