pwupd.c revision 30259 
1/*-
2 * Copyright (C) 1996
3 *	David L. Nugent.  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.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef lint
28static const char rcsid[] =
29	"$Id$";
30#endif /* not lint */
31
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <unistd.h>
36#include <stdarg.h>
37#include <errno.h>
38#include <sys/types.h>
39#include <sys/stat.h>
40#include <sys/wait.h>
41
42#include "pwupd.h"
43
44#define HAVE_PWDB_C	1
45
46static int
47pwdb(char *arg,...)
48{
49	int             i = 0;
50	pid_t           pid;
51	va_list         ap;
52	char           *args[8];
53
54	args[i++] = _PATH_PWD_MKDB;
55	va_start(ap, arg);
56	while (i < 6 && arg != NULL) {
57		args[i++] = arg;
58		arg = va_arg(ap, char *);
59	}
60	args[i++] = _PATH_MASTERPASSWD;
61	args[i] = NULL;
62
63	if ((pid = fork()) == -1)	/* Error (errno set) */
64		i = -1;
65	else if (pid == 0) {	/* Child */
66		execv(args[0], args);
67		_exit(1);
68	} else {		/* Parent */
69		waitpid(pid, &i, 0);
70		if ((i = WEXITSTATUS(i)) != 0)
71			errno = EIO;	/* set SOMETHING */
72	}
73	return i;
74}
75
76int
77fmtpwentry(char *buf, struct passwd * pwd, int type)
78{
79	int             l;
80	char           *pw;
81
82	pw = (pwd->pw_passwd == NULL || !*pwd->pw_passwd) ? "" : (type == PWF_MASTER) ? pwd->pw_passwd : "*";
83
84	if (type == PWF_PASSWD)
85		l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n",
86		       pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid,
87			    pwd->pw_gecos ? pwd->pw_gecos : "User &",
88			    pwd->pw_dir, pwd->pw_shell);
89	else
90		l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n",
91		   pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid,
92			    pwd->pw_class ? pwd->pw_class : "",
93			    (unsigned long) pwd->pw_change,
94			    (unsigned long) pwd->pw_expire,
95			    pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
96	return l;
97}
98
99
100int
101fmtpwent(char *buf, struct passwd * pwd)
102{
103	return fmtpwentry(buf, pwd, PWF_STANDARD);
104}
105
106static int
107pw_update(struct passwd * pwd, char const * user, int mode)
108{
109	int             rc = 0;
110
111	endpwent();
112
113	/*
114	 * First, let's check the see if the database is alright
115	 * Note: -c is only available in FreeBSD 2.2 and above
116	 */
117#ifdef HAVE_PWDB_C
118	if (pwdb("-c", NULL) == 0) {	/* Check only */
119#else
120	{				/* No -c */
121#endif
122		char            pfx[32];
123		char            pwbuf[PWBUFSZ];
124		int             l = sprintf(pfx, "%s:", user);
125
126		/*
127		 * Update the passwd file first
128		 */
129		if (pwd == NULL)
130			*pwbuf = '\0';
131		else
132			fmtpwentry(pwbuf, pwd, PWF_PASSWD);
133		if ((rc = fileupdate(_PATH_PASSWD, 0644, pwbuf, pfx, l, mode)) != 0) {
134
135			/*
136			 * Then the master.passwd file
137			 */
138			if (pwd != NULL)
139				fmtpwentry(pwbuf, pwd, PWF_MASTER);
140			if ((rc = fileupdate(_PATH_MASTERPASSWD, 0644, pwbuf, pfx, l, mode)) != 0)
141				rc = pwdb(NULL) == 0;
142		}
143	}
144	return rc;
145}
146
147int
148addpwent(struct passwd * pwd)
149{
150	return pw_update(pwd, pwd->pw_name, UPD_CREATE);
151}
152
153int
154chgpwent(char const * login, struct passwd * pwd)
155{
156	return pw_update(pwd, login, UPD_REPLACE);
157}
158
159int
160delpwent(struct passwd * pwd)
161{
162	return pw_update(NULL, pwd->pw_name, UPD_DELETE);
163}
164