pwupd.c revision 50653 
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 50653 1999-08-30 10:35:38Z sheldonh $";
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
47static char pathpwd[] = _PATH_PWD;
48static char * pwpath = pathpwd;
49
50int
51setpwdir(const char * dir)
52{
53	if (dir == NULL)
54		return -1;
55	else {
56		char * d = malloc(strlen(dir)+1);
57		if (d == NULL)
58			return -1;
59		pwpath = strcpy(d, dir);
60	}
61	return 0;
62}
63
64char *
65getpwpath(char const * file)
66{
67	static char pathbuf[MAXPATHLEN];
68
69	snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
70	return pathbuf;
71}
72
73int
74pwdb(char *arg,...)
75{
76	int             i = 0;
77	pid_t           pid;
78	va_list         ap;
79	char           *args[10];
80
81	args[i++] = _PATH_PWD_MKDB;
82	va_start(ap, arg);
83	while (i < 6 && arg != NULL) {
84		args[i++] = arg;
85		arg = va_arg(ap, char *);
86	}
87	if (pwpath != pathpwd) {
88		args[i++] = "-d";
89		args[i++] = pwpath;
90	}
91	args[i++] = getpwpath(_MASTERPASSWD);
92	args[i] = NULL;
93
94	if ((pid = fork()) == -1)	/* Error (errno set) */
95		i = -1;
96	else if (pid == 0) {	/* Child */
97		execv(args[0], args);
98		_exit(1);
99	} else {		/* Parent */
100		waitpid(pid, &i, 0);
101		if ((i = WEXITSTATUS(i)) != 0)
102			errno = EIO;	/* set SOMETHING */
103	}
104	return i;
105}
106
107int
108fmtpwentry(char *buf, struct passwd * pwd, int type)
109{
110	int             l;
111	char           *pw;
112
113	pw = (pwd->pw_passwd == NULL || !*pwd->pw_passwd) ? "" : (type == PWF_MASTER) ? pwd->pw_passwd : "*";
114
115	if (type == PWF_PASSWD)
116		l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n",
117		       pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid,
118			    pwd->pw_gecos ? pwd->pw_gecos : "User &",
119			    pwd->pw_dir, pwd->pw_shell);
120	else
121		l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n",
122		   pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid,
123			    pwd->pw_class ? pwd->pw_class : "",
124			    (unsigned long) pwd->pw_change,
125			    (unsigned long) pwd->pw_expire,
126			    pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
127	return l;
128}
129
130
131int
132fmtpwent(char *buf, struct passwd * pwd)
133{
134	return fmtpwentry(buf, pwd, PWF_STANDARD);
135}
136
137static int
138pw_update(struct passwd * pwd, char const * user, int mode)
139{
140	int             rc = 0;
141
142	ENDPWENT();
143
144	/*
145	 * First, let's check the see if the database is alright
146	 * Note: -C is only available in FreeBSD 2.2 and above
147	 */
148#ifdef HAVE_PWDB_C
149	if (pwdb("-C", NULL) == 0) {	/* Check only */
150#else
151	{				/* No -C */
152#endif
153		char            pfx[32];
154		char            pwbuf[PWBUFSZ];
155		int             l = sprintf(pfx, "%s:", user);
156
157		/*
158		 * Update the passwd file first
159		 */
160		if (pwd == NULL)
161			*pwbuf = '\0';
162		else
163			fmtpwentry(pwbuf, pwd, PWF_PASSWD);
164		if ((rc = fileupdate(getpwpath(_PASSWD), 0644, pwbuf, pfx, l, mode)) != 0) {
165
166			/*
167			 * Then the master.passwd file
168			 */
169			if (pwd != NULL)
170				fmtpwentry(pwbuf, pwd, PWF_MASTER);
171			if ((rc = fileupdate(getpwpath(_MASTERPASSWD), 0644, pwbuf, pfx, l, mode)) != 0) {
172				if (mode == UPD_DELETE)
173					rc = pwdb(NULL) == 0;
174				else
175					rc = pwdb("-u", user, NULL) == 0;
176			}
177		}
178	}
179	return rc;
180}
181
182int
183addpwent(struct passwd * pwd)
184{
185	return pw_update(pwd, pwd->pw_name, UPD_CREATE);
186}
187
188int
189chgpwent(char const * login, struct passwd * pwd)
190{
191	return pw_update(pwd, login, UPD_REPLACE);
192}
193
194int
195delpwent(struct passwd * pwd)
196{
197	return pw_update(NULL, pwd->pw_name, UPD_DELETE);
198}
199