1/*	$NetBSD: af_inet.c,v 1.14 2009/09/11 22:06:29 dyoung Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *      The Regents of the University of California.  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 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__RCSID("$NetBSD: af_inet.c,v 1.14 2009/09/11 22:06:29 dyoung Exp $");
35#endif /* not lint */
36
37#include <sys/param.h>
38#include <sys/ioctl.h>
39#include <sys/socket.h>
40
41#include <net/if.h>
42#include <netinet/in.h>
43#include <netinet/in_var.h>
44
45#include <arpa/inet.h>
46
47#include <assert.h>
48#include <err.h>
49#include <errno.h>
50#include <ifaddrs.h>
51#include <netdb.h>
52#include <string.h>
53#include <stdlib.h>
54#include <stdio.h>
55#include <util.h>
56
57#include "env.h"
58#include "extern.h"
59#include "af_inetany.h"
60#include "prog_ops.h"
61
62static void in_constructor(void) __attribute__((constructor));
63static void in_status(prop_dictionary_t, prop_dictionary_t, bool);
64static void in_commit_address(prop_dictionary_t, prop_dictionary_t);
65static void in_alias(const char *, prop_dictionary_t, prop_dictionary_t,
66    struct in_aliasreq *);
67
68static struct afswtch af = {
69	.af_name = "inet", .af_af = AF_INET, .af_status = in_status,
70	.af_addr_commit = in_commit_address
71};
72
73static void
74in_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv,
75    struct in_aliasreq *creq)
76{
77	struct ifreq ifr;
78	bool alias;
79	int s;
80	unsigned short flags;
81	struct in_aliasreq in_addreq;
82	const struct sockaddr_in * const asin = &in_addreq.ifra_addr;
83	const struct sockaddr_in * const dsin = &in_addreq.ifra_dstaddr;
84	const struct sockaddr_in * const bsin = &in_addreq.ifra_broadaddr;
85	char hbuf[NI_MAXHOST];
86	const int niflag = Nflag ? 0 : NI_NUMERICHOST;
87
88	if (lflag)
89		return;
90
91	alias = true;
92
93	/* Get the non-alias address for this interface. */
94	if ((s = getsock(AF_INET)) == -1) {
95		if (errno == EAFNOSUPPORT)
96			return;
97		err(EXIT_FAILURE, "socket");
98	}
99	memset(&ifr, 0, sizeof(ifr));
100	estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
101	if (prog_ioctl(s, SIOCGIFADDR, &ifr) == -1) {
102		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
103			return;
104		warn("SIOCGIFADDR");
105	}
106	/* If creq and ifr are the same address, this is not an alias. */
107	if (memcmp(&ifr.ifr_addr, &creq->ifra_addr, sizeof(ifr.ifr_addr)) == 0)
108		alias = false;
109	in_addreq = *creq;
110	if (prog_ioctl(s, SIOCGIFALIAS, &in_addreq) == -1) {
111		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
112			return;
113		} else
114			warn("SIOCGIFALIAS");
115	}
116
117	if (getnameinfo((const struct sockaddr *)asin, asin->sin_len,
118			hbuf, sizeof(hbuf), NULL, 0, niflag))
119		strlcpy(hbuf, "", sizeof(hbuf));	/* some message? */
120	printf("\tinet %s%s", alias ? "alias " : "", hbuf);
121
122	if (getifflags(env, oenv, &flags) == -1)
123		err(EXIT_FAILURE, "%s: getifflags", __func__);
124
125	if (flags & IFF_POINTOPOINT) {
126		if (getnameinfo((const struct sockaddr *)dsin, dsin->sin_len,
127				hbuf, sizeof(hbuf), NULL, 0, niflag))
128			strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
129		printf(" -> %s", hbuf);
130	}
131
132	printf(" netmask 0x%x", ntohl(in_addreq.ifra_mask.sin_addr.s_addr));
133
134	if (flags & IFF_BROADCAST) {
135		if (getnameinfo((const struct sockaddr *)bsin, bsin->sin_len,
136				hbuf, sizeof(hbuf), NULL, 0, niflag))
137			strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
138		printf(" broadcast %s", hbuf);
139	}
140}
141
142static void
143in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
144{
145	struct ifaddrs *ifap, *ifa;
146	struct in_aliasreq ifra;
147	bool printprefs = false;
148	const char *ifname;
149
150	if ((ifname = getifname(env)) == NULL)
151		err(EXIT_FAILURE, "%s: getifname", __func__);
152
153	if (getifaddrs(&ifap) != 0)
154		err(EXIT_FAILURE, "getifaddrs");
155
156	printprefs = ifa_any_preferences(ifname, ifap, AF_INET);
157
158	for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
159		if (strcmp(ifname, ifa->ifa_name) != 0)
160			continue;
161		if (ifa->ifa_addr->sa_family != AF_INET)
162			continue;
163		if (sizeof(ifra.ifra_addr) < ifa->ifa_addr->sa_len)
164			continue;
165
166		memset(&ifra, 0, sizeof(ifra));
167		estrlcpy(ifra.ifra_name, ifa->ifa_name, sizeof(ifra.ifra_name));
168		memcpy(&ifra.ifra_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len);
169		in_alias(ifa->ifa_name, env, oenv, &ifra);
170		if (printprefs)
171			ifa_print_preference(ifa->ifa_name, ifa->ifa_addr);
172		printf("\n");
173	}
174	freeifaddrs(ifap);
175}
176
177static void
178in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
179{
180	struct ifreq in_ifr;
181	struct in_aliasreq in_ifra;
182	struct afparam inparam = {
183		  .req = BUFPARAM(in_ifra)
184		, .dgreq = BUFPARAM(in_ifr)
185		, .name = {
186			  {.buf = in_ifr.ifr_name,
187			   .buflen = sizeof(in_ifr.ifr_name)}
188			, {.buf = in_ifra.ifra_name,
189			   .buflen = sizeof(in_ifra.ifra_name)}
190		  }
191		, .dgaddr = BUFPARAM(in_ifr.ifr_addr)
192		, .addr = BUFPARAM(in_ifra.ifra_addr)
193		, .dst = BUFPARAM(in_ifra.ifra_dstaddr)
194		, .brd = BUFPARAM(in_ifra.ifra_broadaddr)
195		, .mask = BUFPARAM(in_ifra.ifra_mask)
196		, .aifaddr = IFADDR_PARAM(SIOCAIFADDR)
197		, .difaddr = IFADDR_PARAM(SIOCDIFADDR)
198		, .gifaddr = IFADDR_PARAM(SIOCGIFADDR)
199		, .defmask = {.buf = NULL, .buflen = 0}
200	};
201	memset(&in_ifr, 0, sizeof(in_ifr));
202	memset(&in_ifra, 0, sizeof(in_ifra));
203	commit_address(env, oenv, &inparam);
204}
205
206static void
207in_constructor(void)
208{
209	register_family(&af);
210}
211