pwupd.c revision 20253 
1/*-
2 * Copyright (c) 1996 by David L. Nugent <davidn@blaze.net.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer as
10 *    the first lines of this file unmodified.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by David L. Nugent.
17 * 4. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE DAVID L. NUGENT ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	$Id$
33 */
34
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <unistd.h>
39#include <stdarg.h>
40#include <errno.h>
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <sys/wait.h>
44#include <stdarg.h>
45
46#include "pwupd.h"
47
48static int
49pwdb(char *arg,...)
50{
51	int             i = 0;
52	pid_t           pid;
53	va_list         ap;
54	char           *args[8];
55
56	args[i++] = _PATH_PWD_MKDB;
57	va_start(ap, arg);
58	while (i < 6 && arg != NULL) {
59		args[i++] = arg;
60		arg = va_arg(ap, char *);
61	}
62	args[i++] = _PATH_MASTERPASSWD;
63	args[i] = NULL;
64
65	if ((pid = fork()) == -1)	/* Error (errno set) */
66		i = -1;
67	else if (pid == 0) {	/* Child */
68		execv(args[0], args);
69		_exit(1);
70	} else {		/* Parent */
71		waitpid(pid, &i, 0);
72		if ((i = WEXITSTATUS(i)) != 0)
73			errno = EIO;	/* set SOMETHING */
74	}
75	return i;
76}
77
78int
79fmtpwentry(char *buf, struct passwd * pwd, int type)
80{
81	int             l;
82	char           *pw;
83
84	pw = (pwd->pw_passwd == NULL || !*pwd->pw_passwd) ? "" : (type == PWF_MASTER) ? pwd->pw_passwd : "*";
85
86	if (type == PWF_PASSWD)
87		l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n",
88		       pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid,
89			    pwd->pw_gecos ? pwd->pw_gecos : "User &",
90			    pwd->pw_dir, pwd->pw_shell);
91	else
92		l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n",
93		   pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid,
94			    pwd->pw_class ? pwd->pw_class : "",
95			    (unsigned long) pwd->pw_change,
96			    (unsigned long) pwd->pw_expire,
97			    pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
98	return l;
99}
100
101
102int
103fmtpwent(char *buf, struct passwd * pwd)
104{
105	return fmtpwentry(buf, pwd, PWF_STANDARD);
106}
107
108static int
109pw_update(struct passwd * pwd, char const * user, int mode)
110{
111	int             rc = 0;
112
113	endpwent();
114
115	/*
116	 * First, let's check the see if the database is alright
117	 */
118	if (pwdb("-c", NULL) == 0) {	/* Check only */
119		char            pfx[32];
120		char            pwbuf[MAXPWLINE];
121		int             l = sprintf(pfx, "%s:", user);
122
123		/*
124		 * Update the passwd file first
125		 */
126		if (pwd == NULL)
127			*pwbuf = '\0';
128		else
129			fmtpwentry(pwbuf, pwd, PWF_PASSWD);
130		if ((rc = fileupdate(_PATH_PASSWD, 0644, pwbuf, pfx, l, mode)) != 0) {
131
132			/*
133			 * Then the master.passwd file
134			 */
135			if (pwd != NULL)
136				fmtpwentry(pwbuf, pwd, PWF_MASTER);
137			if ((rc = fileupdate(_PATH_MASTERPASSWD, 0644, pwbuf, pfx, l, mode)) != 0)
138				rc = pwdb(NULL) == 0;
139		}
140	}
141	return rc;
142}
143
144int
145addpwent(struct passwd * pwd)
146{
147	return pw_update(pwd, pwd->pw_name, UPD_CREATE);
148}
149
150int
151chgpwent(char const * login, struct passwd * pwd)
152{
153	return pw_update(pwd, login, UPD_REPLACE);
154}
155
156int
157delpwent(struct passwd * pwd)
158{
159	return pw_update(NULL, pwd->pw_name, UPD_DELETE);
160}
161