pwupd.c revision 88280 
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  "$FreeBSD: head/usr.sbin/pw/pwupd.c 88280 2001-12-20 16:03:04Z nectar $";
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/param.h>
41#include <sys/wait.h>
42
43#include "pwupd.h"
44
45#define HAVE_PWDB_C	1
46#define	HAVE_PWDB_U	1
47
48static char pathpwd[] = _PATH_PWD;
49static char * pwpath = pathpwd;
50
51int
52setpwdir(const char * dir)
53{
54	if (dir == NULL)
55		return -1;
56	else {
57		char * d = malloc(strlen(dir)+1);
58		if (d == NULL)
59			return -1;
60		pwpath = strcpy(d, dir);
61	}
62	return 0;
63}
64
65char *
66getpwpath(char const * file)
67{
68	static char pathbuf[MAXPATHLEN];
69
70	snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
71	return pathbuf;
72}
73
74int
75pwdb(char *arg,...)
76{
77	int             i = 0;
78	pid_t           pid;
79	va_list         ap;
80	char           *args[10];
81
82	args[i++] = _PATH_PWD_MKDB;
83	va_start(ap, arg);
84	while (i < 6 && arg != NULL) {
85		args[i++] = arg;
86		arg = va_arg(ap, char *);
87	}
88	if (pwpath != pathpwd) {
89		args[i++] = "-d";
90		args[i++] = pwpath;
91	}
92	args[i++] = getpwpath(_MASTERPASSWD);
93	args[i] = NULL;
94
95	if ((pid = fork()) == -1)	/* Error (errno set) */
96		i = errno;
97	else if (pid == 0) {	/* Child */
98		execv(args[0], args);
99		_exit(1);
100	} else {		/* Parent */
101		waitpid(pid, &i, 0);
102		if (WEXITSTATUS(i))
103			i = EIO;
104	}
105	return i;
106}
107
108int
109fmtpwentry(char *buf, struct passwd * pwd, int type)
110{
111	int             l;
112	char           *pw;
113
114	pw = (pwd->pw_passwd == NULL || !*pwd->pw_passwd) ? "" : (type == PWF_MASTER) ? pwd->pw_passwd : "*";
115
116	if (type == PWF_PASSWD)
117		l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n",
118		       pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid,
119			    pwd->pw_gecos ? pwd->pw_gecos : "User &",
120			    pwd->pw_dir, pwd->pw_shell);
121	else
122		l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n",
123		   pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid,
124			    pwd->pw_class ? pwd->pw_class : "",
125			    (unsigned long) pwd->pw_change,
126			    (unsigned long) pwd->pw_expire,
127			    pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
128	return l;
129}
130
131
132int
133fmtpwent(char *buf, struct passwd * pwd)
134{
135	return fmtpwentry(buf, pwd, PWF_STANDARD);
136}
137
138static int
139pw_update(struct passwd * pwd, char const * user, int mode)
140{
141	int             rc = 0;
142
143	ENDPWENT();
144
145	/*
146	 * First, let's check the see if the database is alright
147	 * Note: -C is only available in FreeBSD 2.2 and above
148	 */
149#ifdef HAVE_PWDB_C
150	if (pwdb("-C", NULL) == 0) {	/* Check only */
151#else
152	{				/* No -C */
153#endif
154		char            pfx[PWBUFSZ];
155		char            pwbuf[PWBUFSZ];
156		int             l = snprintf(pfx, PWBUFSZ, "%s:", user);
157#ifdef HAVE_PWDB_U
158		int		isrename = pwd!=NULL && strcmp(user, pwd->pw_name);
159#endif
160
161		/*
162		 * Update the passwd file first
163		 */
164		if (pwd == NULL)
165			*pwbuf = '\0';
166		else
167			fmtpwentry(pwbuf, pwd, PWF_PASSWD);
168
169		if (l < 0)
170			l = 0;
171		rc = fileupdate(getpwpath(_PASSWD), 0644, pwbuf, pfx, l, mode);
172		if (rc == 0) {
173
174			/*
175			 * Then the master.passwd file
176			 */
177			if (pwd != NULL)
178				fmtpwentry(pwbuf, pwd, PWF_MASTER);
179			rc = fileupdate(getpwpath(_MASTERPASSWD), 0600, pwbuf, pfx, l, mode);
180			if (rc == 0) {
181#ifdef HAVE_PWDB_U
182				if (mode == UPD_DELETE || isrename)
183#endif
184					rc = pwdb(NULL);
185#ifdef HAVE_PWDB_U
186				else
187					rc = pwdb("-u", user, NULL);
188#endif
189			}
190		}
191	}
192	return rc;
193}
194
195int
196addpwent(struct passwd * pwd)
197{
198	return pw_update(pwd, pwd->pw_name, UPD_CREATE);
199}
200
201int
202chgpwent(char const * login, struct passwd * pwd)
203{
204	return pw_update(pwd, login, UPD_REPLACE);
205}
206
207int
208delpwent(struct passwd * pwd)
209{
210	return pw_update(NULL, pwd->pw_name, UPD_DELETE);
211}
212