ifgroup.c revision 330449 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2006 Max Laier. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef lint
29static const char rcsid[] =
30  "$FreeBSD: stable/11/sbin/ifconfig/ifgroup.c 330449 2018-03-05 07:26:05Z eadler $";
31#endif /* not lint */
32
33#include <sys/param.h>
34#include <sys/ioctl.h>
35#include <sys/socket.h>
36#include <net/if.h>
37
38#include <ctype.h>
39#include <err.h>
40#include <errno.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45
46#include "ifconfig.h"
47
48/* ARGSUSED */
49static void
50setifgroup(const char *group_name, int d, int s, const struct afswtch *rafp)
51{
52	struct ifgroupreq ifgr;
53
54	memset(&ifgr, 0, sizeof(ifgr));
55	strlcpy(ifgr.ifgr_name, name, IFNAMSIZ);
56
57	if (group_name[0] && isdigit(group_name[strlen(group_name) - 1]))
58		errx(1, "setifgroup: group names may not end in a digit");
59
60	if (strlcpy(ifgr.ifgr_group, group_name, IFNAMSIZ) >= IFNAMSIZ)
61		errx(1, "setifgroup: group name too long");
62	if (ioctl(s, SIOCAIFGROUP, (caddr_t)&ifgr) == -1 && errno != EEXIST)
63		err(1," SIOCAIFGROUP");
64}
65
66/* ARGSUSED */
67static void
68unsetifgroup(const char *group_name, int d, int s, const struct afswtch *rafp)
69{
70	struct ifgroupreq ifgr;
71
72	memset(&ifgr, 0, sizeof(ifgr));
73	strlcpy(ifgr.ifgr_name, name, IFNAMSIZ);
74
75	if (group_name[0] && isdigit(group_name[strlen(group_name) - 1]))
76		errx(1, "unsetifgroup: group names may not end in a digit");
77
78	if (strlcpy(ifgr.ifgr_group, group_name, IFNAMSIZ) >= IFNAMSIZ)
79		errx(1, "unsetifgroup: group name too long");
80	if (ioctl(s, SIOCDIFGROUP, (caddr_t)&ifgr) == -1 && errno != ENOENT)
81		err(1, "SIOCDIFGROUP");
82}
83
84static void
85getifgroups(int s)
86{
87	int			 len, cnt;
88	struct ifgroupreq	 ifgr;
89	struct ifg_req		*ifg;
90
91	memset(&ifgr, 0, sizeof(ifgr));
92	strlcpy(ifgr.ifgr_name, name, IFNAMSIZ);
93
94	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
95		if (errno == EINVAL || errno == ENOTTY)
96			return;
97		else
98			err(1, "SIOCGIFGROUP");
99	}
100
101	len = ifgr.ifgr_len;
102	ifgr.ifgr_groups =
103	    (struct ifg_req *)calloc(len / sizeof(struct ifg_req),
104	    sizeof(struct ifg_req));
105	if (ifgr.ifgr_groups == NULL)
106		err(1, "getifgroups");
107	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
108		err(1, "SIOCGIFGROUP");
109
110	cnt = 0;
111	ifg = ifgr.ifgr_groups;
112	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
113		len -= sizeof(struct ifg_req);
114		if (strcmp(ifg->ifgrq_group, "all")) {
115			if (cnt == 0)
116				printf("\tgroups: ");
117			cnt++;
118			printf("%s ", ifg->ifgrq_group);
119		}
120	}
121	if (cnt)
122		printf("\n");
123
124	free(ifgr.ifgr_groups);
125}
126
127static void
128printgroup(const char *groupname)
129{
130	struct ifgroupreq	 ifgr;
131	struct ifg_req		*ifg;
132	int			 len, cnt = 0;
133	int			 s;
134
135	s = socket(AF_LOCAL, SOCK_DGRAM, 0);
136	if (s == -1)
137		err(1, "socket(AF_LOCAL,SOCK_DGRAM)");
138	bzero(&ifgr, sizeof(ifgr));
139	strlcpy(ifgr.ifgr_name, groupname, sizeof(ifgr.ifgr_name));
140	if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1) {
141		if (errno == EINVAL || errno == ENOTTY ||
142		    errno == ENOENT)
143			exit(0);
144		else
145			err(1, "SIOCGIFGMEMB");
146	}
147
148	len = ifgr.ifgr_len;
149	if ((ifgr.ifgr_groups = calloc(1, len)) == NULL)
150		err(1, "printgroup");
151	if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1)
152		err(1, "SIOCGIFGMEMB");
153
154	for (ifg = ifgr.ifgr_groups; ifg && len >= sizeof(struct ifg_req);
155	    ifg++) {
156		len -= sizeof(struct ifg_req);
157		printf("%s\n", ifg->ifgrq_member);
158		cnt++;
159	}
160	free(ifgr.ifgr_groups);
161
162	exit(0);
163}
164
165static struct cmd group_cmds[] = {
166	DEF_CMD_ARG("group",	setifgroup),
167	DEF_CMD_ARG("-group",	unsetifgroup),
168};
169static struct afswtch af_group = {
170	.af_name	= "af_group",
171	.af_af		= AF_UNSPEC,
172	.af_other_status = getifgroups,
173};
174static struct option group_gopt = { "g:", "[-g groupname]", printgroup };
175
176static __constructor void
177group_ctor(void)
178{
179	int i;
180
181	for (i = 0; i < nitems(group_cmds);  i++)
182		cmd_register(&group_cmds[i]);
183	af_register(&af_group);
184	opt_register(&group_gopt);
185}
186