1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2003 Bruce M. Simpson.
5 * All rights reserved
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include "namespace.h"
30#include <sys/param.h>
31#include <sys/sysctl.h>
32#include <sys/ioctl.h>
33#include <sys/socket.h>
34#include <net/if.h>
35#include <net/if_dl.h>
36#include <net/route.h>
37
38#include <errno.h>
39#include <ifaddrs.h>
40#include <stdlib.h>
41#include <string.h>
42#include "un-namespace.h"
43
44#define	SALIGN	(sizeof(long) - 1)
45#define	SA_RLEN(sa)	((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : \
46			    (SALIGN + 1))
47#define	MAX_SYSCTL_TRY	5
48#define	RTA_MASKS	(RTA_GATEWAY | RTA_IFP | RTA_IFA)
49
50int
51getifmaddrs(struct ifmaddrs **pif)
52{
53	int icnt = 1;
54	int dcnt = 0;
55	int ntry = 0;
56	size_t len;
57	size_t needed;
58	int mib[6];
59	int i;
60	char *buf;
61	char *data;
62	char *next;
63	char *p;
64	struct ifma_msghdr *ifmam;
65	struct ifmaddrs *ifa, *ift;
66	struct rt_msghdr *rtm;
67	struct sockaddr *sa;
68
69	mib[0] = CTL_NET;
70	mib[1] = PF_ROUTE;
71	mib[2] = 0;             /* protocol */
72	mib[3] = 0;             /* wildcard address family */
73	mib[4] = NET_RT_IFMALIST;
74	mib[5] = 0;             /* no flags */
75	do {
76		if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
77			return (-1);
78		if ((buf = malloc(needed)) == NULL)
79			return (-1);
80		if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
81			if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
82				free(buf);
83				return (-1);
84			}
85			free(buf);
86			buf = NULL;
87		}
88	} while (buf == NULL);
89
90	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
91		rtm = (struct rt_msghdr *)(void *)next;
92		if (rtm->rtm_version != RTM_VERSION)
93			continue;
94		switch (rtm->rtm_type) {
95		case RTM_NEWMADDR:
96			ifmam = (struct ifma_msghdr *)(void *)rtm;
97			if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
98				break;
99			icnt++;
100			p = (char *)(ifmam + 1);
101			for (i = 0; i < RTAX_MAX; i++) {
102				if ((RTA_MASKS & ifmam->ifmam_addrs &
103				    (1 << i)) == 0)
104					continue;
105				sa = (struct sockaddr *)(void *)p;
106				len = SA_RLEN(sa);
107				dcnt += len;
108				p += len;
109			}
110			break;
111		}
112	}
113
114	data = malloc(sizeof(struct ifmaddrs) * icnt + dcnt);
115	if (data == NULL) {
116		free(buf);
117		return (-1);
118	}
119
120	ifa = (struct ifmaddrs *)(void *)data;
121	data += sizeof(struct ifmaddrs) * icnt;
122
123	memset(ifa, 0, sizeof(struct ifmaddrs) * icnt);
124	ift = ifa;
125
126	for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
127		rtm = (struct rt_msghdr *)(void *)next;
128		if (rtm->rtm_version != RTM_VERSION)
129			continue;
130
131		switch (rtm->rtm_type) {
132		case RTM_NEWMADDR:
133			ifmam = (struct ifma_msghdr *)(void *)rtm;
134			if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
135				break;
136
137			p = (char *)(ifmam + 1);
138			for (i = 0; i < RTAX_MAX; i++) {
139				if ((RTA_MASKS & ifmam->ifmam_addrs &
140				    (1 << i)) == 0)
141					continue;
142				sa = (struct sockaddr *)(void *)p;
143				len = SA_RLEN(sa);
144				switch (i) {
145				case RTAX_GATEWAY:
146					ift->ifma_lladdr =
147					    (struct sockaddr *)(void *)data;
148					memcpy(data, p, len);
149					data += len;
150					break;
151
152				case RTAX_IFP:
153					ift->ifma_name =
154					    (struct sockaddr *)(void *)data;
155					memcpy(data, p, len);
156					data += len;
157					break;
158
159				case RTAX_IFA:
160					ift->ifma_addr =
161					    (struct sockaddr *)(void *)data;
162					memcpy(data, p, len);
163					data += len;
164					break;
165
166				default:
167					data += len;
168					break;
169				}
170				p += len;
171			}
172			ift->ifma_next = ift + 1;
173			ift = ift->ifma_next;
174			break;
175		}
176	}
177
178	free(buf);
179
180	if (ift > ifa) {
181		ift--;
182		ift->ifma_next = NULL;
183		*pif = ifa;
184	} else {
185		*pif = NULL;
186		free(ifa);
187	}
188	return (0);
189}
190
191void
192freeifmaddrs(struct ifmaddrs *ifmp)
193{
194
195	free(ifmp);
196}
197