summaryrefslogtreecommitdiffstats
path: root/usr.sbin/pw/grupd.c
blob: feff4307b2a57e94ea600927c237156438b2aaba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*-
 * Copyright (C) 1996
 *	David L. Nugent.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
	"$Id$";
#endif /* not lint */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "pwupd.h"

int
fmtgrentry(char **buf, int * buflen, struct group * grp, int type)
{
	int             i, l;

	/*
	 * Since a group line is of arbitrary length,
	 * we need to calculate up-front just how long
	 * it will need to be...
	 */
	/*  groupname              :   password                 :  gid  : */
	l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1;
	/* group members + comma separator */
	for (i = 0; grp->gr_mem[i] != NULL; i++) {
		l += strlen(grp->gr_mem[i]) + 1;
	}
	l += 2; /* For newline & NUL */
	if (extendline(buf, buflen, l) == -1)
		l = -1;
	else{
		/*
		 * Now we can safely format
		 */
		if (type == PWF_STANDARD)
			l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid);
		else
			l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);

		/*
		 * List members
		 */
		for (i = 0; grp->gr_mem[i] != NULL; i++) {
			l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]);
		}

		(*buf)[l++] = '\n';
		(*buf)[l] = '\0';
	}
	return l;
}


int
fmtgrent(char **buf, int * buflen, struct group * grp)
{
	return fmtgrentry(buf, buflen, grp, PWF_STANDARD);
}


static int
gr_update(struct group * grp, char const * group, int mode)
{
	int             l;
	char            pfx[64];
	int		grbuflen = 0;
	char	       *grbuf = NULL;

	endgrent();
	l = snprintf(pfx, sizeof pfx, "%s:", group);

	/*
	 * Update the group file
	 */
	if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1)
		l = -1;
	else
		l = fileupdate(_PATH_GROUP, 0644, grbuf, pfx, l, mode);
	if (grbuf != NULL)
		free(grbuf);
	return l;
}


int
addgrent(struct group * grp)
{
	return gr_update(grp, grp->gr_name, UPD_CREATE);
}

int
chggrent(char const * login, struct group * grp)
{
	return gr_update(grp, login, UPD_REPLACE);
}

int
delgrent(struct group * grp)
{
	return gr_update(NULL, grp->gr_name, UPD_DELETE);
}
OpenPOWER on IntegriCloud