grupd.c revision 22997 
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 *	$Id$
27 */
28
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <unistd.h>
33#include <stdarg.h>
34#include <errno.h>
35#include <sys/types.h>
36#include <sys/stat.h>
37
38#include "pwupd.h"
39
40int
41fmtgrentry(char **buf, int * buflen, struct group * grp, int type)
42{
43	int             i, l;
44
45	/*
46	 * Since a group line is of arbitrary length,
47	 * we need to calculate up-front just how long
48	 * it will need to be...
49	 */
50	/*  groupname              :   password                 :  gid  : */
51	l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1;
52	/* group members + comma separator */
53	for (i = 0; grp->gr_mem[i] != NULL; i++) {
54		l += strlen(grp->gr_mem[i]) + 1;
55	}
56	l += 2; /* For newline & NUL */
57	if (extendline(buf, buflen, l) == -1)
58		l = -1;
59	else{
60		/*
61		 * Now we can safely format
62		 */
63		if (type == PWF_STANDARD)
64			l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid);
65		else
66			l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);
67
68		/*
69		 * List members
70		 */
71		for (i = 0; grp->gr_mem[i] != NULL; i++) {
72			l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]);
73		}
74
75		(*buf)[l++] = '\n';
76		(*buf)[l] = '\0';
77	}
78	return l;
79}
80
81
82int
83fmtgrent(char **buf, int * buflen, struct group * grp)
84{
85	return fmtgrentry(buf, buflen, grp, PWF_STANDARD);
86}
87
88
89static int
90gr_update(struct group * grp, char const * group, int mode)
91{
92	int             l;
93	char            pfx[64];
94	int		grbuflen = 0;
95	char	       *grbuf = NULL;
96
97	endgrent();
98	l = snprintf(pfx, sizeof pfx, "%s:", group);
99
100	/*
101	 * Update the group file
102	 */
103	if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1)
104		l = -1;
105	else
106		l = fileupdate(_PATH_GROUP, 0644, grbuf, pfx, l, mode);
107	if (grbuf != NULL)
108		free(grbuf);
109	return l;
110}
111
112
113int
114addgrent(struct group * grp)
115{
116	return gr_update(grp, grp->gr_name, UPD_CREATE);
117}
118
119int
120chggrent(char const * login, struct group * grp)
121{
122	return gr_update(grp, login, UPD_REPLACE);
123}
124
125int
126delgrent(struct group * grp)
127{
128	return gr_update(NULL, grp->gr_name, UPD_DELETE);
129}
130