ifmcstat.c revision 121316 
1/*
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * 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 * 3. Neither the name of the project nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: head/usr.sbin/ifmcstat/ifmcstat.c 121316 2003-10-21 20:11:47Z ume $
30 */
31
32#include <stdio.h>
33#include <stdlib.h>
34#include <fcntl.h>
35#include <kvm.h>
36#include <nlist.h>
37#include <string.h>
38#include <limits.h>
39
40#include <sys/types.h>
41#include <sys/socket.h>
42#include <sys/queue.h>
43
44#include <net/if.h>
45#include <net/if_var.h>
46#include <net/if_types.h>
47#include <net/if_dl.h>
48#include <netinet/in.h>
49#define	_KERNEL
50#include <netinet/if_ether.h>
51#undef	_KERNEL
52#include <netinet/in_var.h>
53#include <arpa/inet.h>
54
55#include <netdb.h>
56
57kvm_t	*kvmd;
58
59struct	nlist nl[] = {
60#define	N_IFNET	0
61	{ "_ifnet" },
62	{ "" },
63};
64
65const char *inet6_n2a __P((struct in6_addr *));
66int main __P((void));
67char *ifname __P((struct ifnet *));
68void kread __P((u_long, void *, int));
69void if6_addrlist __P((struct ifaddr *));
70void in6_multilist __P((struct in6_multi *));
71struct in6_multi * in6_multientry __P((struct in6_multi *));
72
73#define	KREAD(addr, buf, type) \
74	kread((u_long)addr, (void *)buf, sizeof(type))
75
76#ifdef N_IN6_MK
77struct multi6_kludge {
78	LIST_ENTRY(multi6_kludge) mk_entry;
79	struct ifnet *mk_ifp;
80	struct in6_multihead mk_head;
81};
82#endif
83
84const char *inet6_n2a(p)
85	struct in6_addr *p;
86{
87	static char buf[NI_MAXHOST];
88	struct sockaddr_in6 sin6;
89	u_int32_t scopeid;
90	const int niflags = NI_NUMERICHOST;
91
92	memset(&sin6, 0, sizeof(sin6));
93	sin6.sin6_family = AF_INET6;
94	sin6.sin6_len = sizeof(struct sockaddr_in6);
95	sin6.sin6_addr = *p;
96	if (IN6_IS_ADDR_LINKLOCAL(p) || IN6_IS_ADDR_MC_LINKLOCAL(p)) {
97		scopeid = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
98		if (scopeid) {
99			sin6.sin6_scope_id = scopeid;
100			sin6.sin6_addr.s6_addr[2] = 0;
101			sin6.sin6_addr.s6_addr[3] = 0;
102		}
103	}
104	if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
105			buf, sizeof(buf), NULL, 0, niflags) == 0)
106		return buf;
107	else
108		return "(invalid)";
109}
110
111int main()
112{
113	char	buf[_POSIX2_LINE_MAX], ifname[IFNAMSIZ];
114	struct	ifnet	*ifp, *nifp, ifnet;
115
116	if ((kvmd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, buf)) == NULL) {
117		perror("kvm_openfiles");
118		exit(1);
119	}
120	if (kvm_nlist(kvmd, nl) < 0) {
121		perror("kvm_nlist");
122		exit(1);
123	}
124	if (nl[N_IFNET].n_value == 0) {
125		printf("symbol %s not found\n", nl[N_IFNET].n_name);
126		exit(1);
127	}
128	KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);
129	while (ifp) {
130		KREAD(ifp, &ifnet, struct ifnet);
131		printf("%s:\n", if_indextoname(ifnet.if_index, ifname));
132
133		if6_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
134		nifp = TAILQ_NEXT(&ifnet, if_link);
135
136		/* not supported */
137
138		ifp = nifp;
139	}
140
141	exit(0);
142	/*NOTREACHED*/
143}
144
145char *ifname(ifp)
146	struct ifnet *ifp;
147{
148	static char buf[BUFSIZ];
149	struct ifnet ifnet;
150	char ifnamebuf[IFNAMSIZ];
151
152	KREAD(ifp, &ifnet, struct ifnet);
153	KREAD(ifnet.if_name, ifnamebuf, sizeof(ifnamebuf));
154	snprintf(buf, sizeof(buf), "%s%d", ifnamebuf,
155		 ifnet.if_unit); /* does snprintf allow overlap copy?? */
156	return buf;
157}
158
159void kread(addr, buf, len)
160	u_long addr;
161	void *buf;
162	int len;
163{
164	if (kvm_read(kvmd, addr, buf, len) != len) {
165		perror("kvm_read");
166		exit(1);
167	}
168}
169
170void
171if6_addrlist(ifap)
172	struct ifaddr *ifap;
173{
174	struct ifaddr ifa;
175	struct sockaddr sa;
176	struct in6_ifaddr if6a;
177	struct ifaddr *ifap0;
178
179	ifap0 = ifap;
180	while (ifap) {
181		KREAD(ifap, &ifa, struct ifaddr);
182		if (ifa.ifa_addr == NULL)
183			goto nextifap;
184		KREAD(ifa.ifa_addr, &sa, struct sockaddr);
185		if (sa.sa_family != PF_INET6)
186			goto nextifap;
187		KREAD(ifap, &if6a, struct in6_ifaddr);
188		printf("\tinet6 %s\n", inet6_n2a(&if6a.ia_addr.sin6_addr));
189	nextifap:
190		ifap = TAILQ_NEXT(&ifa, ifa_link);
191	}
192	if (ifap0) {
193		struct ifnet ifnet;
194		struct ifmultiaddr ifm, *ifmp = 0;
195		struct sockaddr_dl sdl;
196
197		KREAD(ifap0, &ifa, struct ifaddr);
198		KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
199		if (TAILQ_FIRST(&ifnet.if_multiaddrs))
200			ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
201		while (ifmp) {
202			KREAD(ifmp, &ifm, struct ifmultiaddr);
203			if (ifm.ifma_addr == NULL)
204				goto nextmulti;
205			KREAD(ifm.ifma_addr, &sa, struct sockaddr);
206			if (sa.sa_family != AF_INET6)
207				goto nextmulti;
208			(void)in6_multientry((struct in6_multi *)
209					     ifm.ifma_protospec);
210			if (ifm.ifma_lladdr == 0)
211				goto nextmulti;
212			KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
213			printf("\t\t\tmcast-macaddr %s multicnt %d\n",
214			       ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
215			       ifm.ifma_refcount);
216		    nextmulti:
217			ifmp = TAILQ_NEXT(&ifm, ifma_link);
218		}
219	}
220#ifdef N_IN6_MK
221	if (nl[N_IN6_MK].n_value != 0) {
222		LIST_HEAD(in6_mktype, multi6_kludge) in6_mk;
223		struct multi6_kludge *mkp, mk;
224		char *nam;
225
226		KREAD(nl[N_IN6_MK].n_value, &in6_mk, struct in6_mktype);
227		KREAD(ifap0, &ifa, struct ifaddr);
228
229		nam = strdup(ifname(ifa.ifa_ifp));
230		if (!nam) {
231			fprintf(stderr, "ifmcstat: not enough core\n");
232			exit(1);
233		}
234
235		LIST_FOREACH(mkp, &in6_mk, mk_entry) {
236			KREAD(mkp, &mk, struct multi6_kludge);
237			if (strcmp(nam, ifname(mk.mk_ifp)) == 0 &&
238			    LIST_FIRST(&mk.mk_head)) {
239				printf("\t(on kludge entry for %s)\n", nam);
240				in6_multilist(LIST_FIRST(&mk.mk_head));
241			}
242		}
243
244		free(nam);
245	}
246#endif
247}
248
249struct in6_multi *
250in6_multientry(mc)
251	struct in6_multi *mc;
252{
253	struct in6_multi multi;
254
255	KREAD(mc, &multi, struct in6_multi);
256	printf("\t\tgroup %s", inet6_n2a(&multi.in6m_addr));
257	printf(" refcnt %u\n", multi.in6m_refcount);
258	return(LIST_NEXT(&multi, in6m_entry));
259}
260
261void
262in6_multilist(mc)
263	struct in6_multi *mc;
264{
265	while (mc)
266		mc = in6_multientry(mc);
267}
268