1/*
2 * ipmaddr.c		"ip maddress".
3 *
4 *		This program is free software; you can redistribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <syslog.h>
17#include <fcntl.h>
18#include <sys/ioctl.h>
19#include <sys/socket.h>
20#include <netinet/in.h>
21#include <arpa/inet.h>
22#include <string.h>
23
24#include <linux/netdevice.h>
25#include <linux/if.h>
26#include <linux/if_arp.h>
27#include <linux/sockios.h>
28
29#include "rt_names.h"
30#include "utils.h"
31
32static struct {
33	char *dev;
34	int  family;
35} filter;
36
37static void usage(void) __attribute__((noreturn));
38
39static void usage(void)
40{
41	fprintf(stderr, "Usage: ip maddr [ add | del ] MULTIADDR dev STRING\n");
42	fprintf(stderr, "       ip maddr show [ dev STRING ]\n");
43	exit(-1);
44}
45
46static int parse_hex(char *str, unsigned char *addr, size_t size)
47{
48	int len=0;
49
50	while (*str && (len < 2 * size)) {
51		int tmp;
52		if (str[1] == 0)
53			return -1;
54		if (sscanf(str, "%02x", &tmp) != 1)
55			return -1;
56		addr[len] = tmp;
57		len++;
58		str += 2;
59	}
60	return len;
61}
62
63struct ma_info
64{
65	struct ma_info *next;
66	int		index;
67	int		users;
68	char		*features;
69	char		name[IFNAMSIZ];
70	inet_prefix	addr;
71};
72
73void maddr_ins(struct ma_info **lst, struct ma_info *m)
74{
75	struct ma_info *mp;
76
77	for (; (mp=*lst) != NULL; lst = &mp->next) {
78		if (mp->index > m->index)
79			break;
80	}
81	m->next = *lst;
82	*lst = m;
83}
84
85void read_dev_mcast(struct ma_info **result_p)
86{
87	char buf[256];
88	FILE *fp = fopen("/proc/net/dev_mcast", "r");
89
90	if (!fp)
91		return;
92
93	while (fgets(buf, sizeof(buf), fp)) {
94		char hexa[256];
95		struct ma_info m;
96		int len;
97		int st;
98
99		memset(&m, 0, sizeof(m));
100		sscanf(buf, "%d%s%d%d%s", &m.index, m.name, &m.users, &st,
101		       hexa);
102		if (filter.dev && strcmp(filter.dev, m.name))
103			continue;
104
105		m.addr.family = AF_PACKET;
106
107		len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data));
108		if (len >= 0) {
109			struct ma_info *ma = malloc(sizeof(m));
110
111			memcpy(ma, &m, sizeof(m));
112			ma->addr.bytelen = len;
113			ma->addr.bitlen = len<<3;
114			if (st)
115				ma->features = "static";
116			maddr_ins(result_p, ma);
117		}
118	}
119	fclose(fp);
120}
121
122void read_igmp(struct ma_info **result_p)
123{
124	struct ma_info m;
125	char buf[256];
126	FILE *fp = fopen("/proc/net/igmp", "r");
127
128	if (!fp)
129		return;
130	memset(&m, 0, sizeof(m));
131	if (!fgets(buf, sizeof(buf), fp)) {
132		fclose(fp);
133		return;
134	}
135
136	m.addr.family = AF_INET;
137	m.addr.bitlen = 32;
138	m.addr.bytelen = 4;
139
140	while (fgets(buf, sizeof(buf), fp)) {
141		struct ma_info *ma;
142
143		if (buf[0] != '\t') {
144			sscanf(buf, "%d%s", &m.index, m.name);
145			continue;
146		}
147
148		if (filter.dev && strcmp(filter.dev, m.name))
149			continue;
150
151		sscanf(buf, "%08x%d", (__u32*)&m.addr.data, &m.users);
152
153		ma = malloc(sizeof(m));
154		memcpy(ma, &m, sizeof(m));
155		maddr_ins(result_p, ma);
156	}
157	fclose(fp);
158}
159
160
161void read_igmp6(struct ma_info **result_p)
162{
163	char buf[256];
164	FILE *fp = fopen("/proc/net/igmp6", "r");
165
166	if (!fp)
167		return;
168
169	while (fgets(buf, sizeof(buf), fp)) {
170		char hexa[256];
171		struct ma_info m;
172		int len;
173
174		memset(&m, 0, sizeof(m));
175		sscanf(buf, "%d%s%s%d", &m.index, m.name, hexa, &m.users);
176
177		if (filter.dev && strcmp(filter.dev, m.name))
178			continue;
179
180		m.addr.family = AF_INET6;
181
182		len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data));
183		if (len >= 0) {
184			struct ma_info *ma = malloc(sizeof(m));
185
186			memcpy(ma, &m, sizeof(m));
187
188			ma->addr.bytelen = len;
189			ma->addr.bitlen = len<<3;
190			maddr_ins(result_p, ma);
191		}
192	}
193	fclose(fp);
194}
195
196static void print_maddr(FILE *fp, struct ma_info *list)
197{
198	fprintf(fp, "\t");
199
200	if (list->addr.family == AF_PACKET) {
201		SPRINT_BUF(b1);
202		fprintf(fp, "link  %s", ll_addr_n2a((unsigned char*)list->addr.data,
203						    list->addr.bytelen, 0,
204						    b1, sizeof(b1)));
205	} else {
206		char abuf[256];
207		switch(list->addr.family) {
208		case AF_INET:
209			fprintf(fp, "inet  ");
210			break;
211		case AF_INET6:
212			fprintf(fp, "inet6 ");
213			break;
214		default:
215			fprintf(fp, "family %d ", list->addr.family);
216			break;
217		}
218		fprintf(fp, "%s",
219			format_host(list->addr.family,
220				    -1,
221				    list->addr.data,
222				    abuf, sizeof(abuf)));
223	}
224	if (list->users != 1)
225		fprintf(fp, " users %d", list->users);
226	if (list->features)
227		fprintf(fp, " %s", list->features);
228	fprintf(fp, "\n");
229}
230
231static void print_mlist(FILE *fp, struct ma_info *list)
232{
233	int cur_index = 0;
234
235	for (; list; list = list->next) {
236		if (oneline) {
237			cur_index = list->index;
238			fprintf(fp, "%d:\t%s%s", cur_index, list->name, _SL_);
239		} else if (cur_index != list->index) {
240			cur_index = list->index;
241			fprintf(fp, "%d:\t%s\n", cur_index, list->name);
242		}
243		print_maddr(fp, list);
244	}
245}
246
247static int multiaddr_list(int argc, char **argv)
248{
249	struct ma_info *list = NULL;
250
251	if (!filter.family)
252		filter.family = preferred_family;
253
254	while (argc > 0) {
255		if (1) {
256			if (strcmp(*argv, "dev") == 0) {
257				NEXT_ARG();
258			}
259			if (matches(*argv, "help") == 0)
260				usage();
261			if (filter.dev)
262				duparg2("dev", *argv);
263			filter.dev = *argv;
264		}
265		argv++; argc--;
266	}
267
268	if (!filter.family || filter.family == AF_PACKET)
269		read_dev_mcast(&list);
270	if (!filter.family || filter.family == AF_INET)
271		read_igmp(&list);
272	if (!filter.family || filter.family == AF_INET6)
273		read_igmp6(&list);
274	print_mlist(stdout, list);
275	return 0;
276}
277
278int multiaddr_modify(int cmd, int argc, char **argv)
279{
280	struct ifreq ifr;
281	int fd;
282
283	memset(&ifr, 0, sizeof(ifr));
284
285	if (cmd == RTM_NEWADDR)
286		cmd = SIOCADDMULTI;
287	else
288		cmd = SIOCDELMULTI;
289
290	while (argc > 0) {
291		if (strcmp(*argv, "dev") == 0) {
292			NEXT_ARG();
293			if (ifr.ifr_name[0])
294				duparg("dev", *argv);
295			strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
296		} else {
297			if (matches(*argv, "address") == 0) {
298				NEXT_ARG();
299			}
300			if (matches(*argv, "help") == 0)
301				usage();
302			if (ifr.ifr_hwaddr.sa_data[0])
303				duparg("address", *argv);
304			if (ll_addr_a2n(ifr.ifr_hwaddr.sa_data,
305					14, *argv) < 0) {
306				fprintf(stderr, "Error: \"%s\" is not a legal ll address.\n", *argv);
307				exit(1);
308			}
309		}
310		argc--; argv++;
311	}
312	if (ifr.ifr_name[0] == 0) {
313		fprintf(stderr, "Not enough information: \"dev\" is required.\n");
314		exit(-1);
315	}
316
317	fd = socket(AF_INET, SOCK_DGRAM, 0);
318	if (fd < 0) {
319		perror("Cannot create socket");
320		exit(1);
321	}
322	if (ioctl(fd, cmd, (char*)&ifr) != 0) {
323		perror("ioctl");
324		exit(1);
325	}
326	close(fd);
327
328	exit(0);
329}
330
331
332int do_multiaddr(int argc, char **argv)
333{
334	if (argc < 1)
335		return multiaddr_list(0, NULL);
336	if (matches(*argv, "add") == 0)
337		return multiaddr_modify(RTM_NEWADDR, argc-1, argv+1);
338	if (matches(*argv, "delete") == 0)
339		return multiaddr_modify(RTM_DELADDR, argc-1, argv+1);
340	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
341	    || matches(*argv, "lst") == 0)
342		return multiaddr_list(argc-1, argv+1);
343	if (matches(*argv, "help") == 0)
344		usage();
345	fprintf(stderr, "Command \"%s\" is unknown, try \"ip maddr help\".\n", *argv);
346	exit(-1);
347}
348