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	fgets(buf, sizeof(buf), fp);
132
133	m.addr.family = AF_INET;
134	m.addr.bitlen = 32;
135	m.addr.bytelen = 4;
136
137	while (fgets(buf, sizeof(buf), fp)) {
138		struct ma_info *ma = malloc(sizeof(m));
139
140		if (buf[0] != '\t') {
141			sscanf(buf, "%d%s", &m.index, m.name);
142			continue;
143		}
144
145		if (filter.dev && strcmp(filter.dev, m.name))
146			continue;
147
148		sscanf(buf, "%08x%d", (__u32*)&m.addr.data, &m.users);
149
150		ma = malloc(sizeof(m));
151		memcpy(ma, &m, sizeof(m));
152		maddr_ins(result_p, ma);
153	}
154	fclose(fp);
155}
156
157
158void read_igmp6(struct ma_info **result_p)
159{
160	char buf[256];
161	FILE *fp = fopen("/proc/net/igmp6", "r");
162
163	if (!fp)
164		return;
165
166	while (fgets(buf, sizeof(buf), fp)) {
167		char hexa[256];
168		struct ma_info m;
169		int len;
170
171		memset(&m, 0, sizeof(m));
172		sscanf(buf, "%d%s%s%d", &m.index, m.name, hexa, &m.users);
173
174		if (filter.dev && strcmp(filter.dev, m.name))
175			continue;
176
177		m.addr.family = AF_INET6;
178
179		len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data));
180		if (len >= 0) {
181			struct ma_info *ma = malloc(sizeof(m));
182
183			memcpy(ma, &m, sizeof(m));
184
185			ma->addr.bytelen = len;
186			ma->addr.bitlen = len<<3;
187			maddr_ins(result_p, ma);
188		}
189	}
190	fclose(fp);
191}
192
193static void print_maddr(FILE *fp, struct ma_info *list)
194{
195	fprintf(fp, "\t");
196
197	if (list->addr.family == AF_PACKET) {
198		SPRINT_BUF(b1);
199		fprintf(fp, "link  %s", ll_addr_n2a((unsigned char*)list->addr.data,
200						    list->addr.bytelen, 0,
201						    b1, sizeof(b1)));
202	} else {
203		char abuf[256];
204		switch(list->addr.family) {
205		case AF_INET:
206			fprintf(fp, "inet  ");
207			break;
208		case AF_INET6:
209			fprintf(fp, "inet6 ");
210			break;
211		default:
212			fprintf(fp, "family %d ", list->addr.family);
213			break;
214		}
215		fprintf(fp, "%s",
216			format_host(list->addr.family,
217				    -1,
218				    list->addr.data,
219				    abuf, sizeof(abuf)));
220	}
221	if (list->users != 1)
222		fprintf(fp, " users %d", list->users);
223	if (list->features)
224		fprintf(fp, " %s", list->features);
225	fprintf(fp, "\n");
226}
227
228static void print_mlist(FILE *fp, struct ma_info *list)
229{
230	int cur_index = 0;
231
232	for (; list; list = list->next) {
233		if (oneline) {
234			cur_index = list->index;
235			fprintf(fp, "%d:\t%s%s", cur_index, list->name, _SL_);
236		} else if (cur_index != list->index) {
237			cur_index = list->index;
238			fprintf(fp, "%d:\t%s\n", cur_index, list->name);
239		}
240		print_maddr(fp, list);
241	}
242}
243
244static int multiaddr_list(int argc, char **argv)
245{
246	struct ma_info *list = NULL;
247
248	if (!filter.family)
249		filter.family = preferred_family;
250
251	while (argc > 0) {
252		if (1) {
253			if (strcmp(*argv, "dev") == 0) {
254				NEXT_ARG();
255			}
256			if (matches(*argv, "help") == 0)
257				usage();
258			if (filter.dev)
259				duparg2("dev", *argv);
260			filter.dev = *argv;
261		}
262		argv++; argc--;
263	}
264
265	if (!filter.family || filter.family == AF_PACKET)
266		read_dev_mcast(&list);
267	if (!filter.family || filter.family == AF_INET)
268		read_igmp(&list);
269	if (!filter.family || filter.family == AF_INET6)
270		read_igmp6(&list);
271	print_mlist(stdout, list);
272	return 0;
273}
274
275int multiaddr_modify(int cmd, int argc, char **argv)
276{
277	struct ifreq ifr;
278	int fd;
279
280	memset(&ifr, 0, sizeof(ifr));
281
282	if (cmd == RTM_NEWADDR)
283		cmd = SIOCADDMULTI;
284	else
285		cmd = SIOCDELMULTI;
286
287	while (argc > 0) {
288		if (strcmp(*argv, "dev") == 0) {
289			NEXT_ARG();
290			if (ifr.ifr_name[0])
291				duparg("dev", *argv);
292			strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
293		} else {
294			if (matches(*argv, "address") == 0) {
295				NEXT_ARG();
296			}
297			if (matches(*argv, "help") == 0)
298				usage();
299			if (ifr.ifr_hwaddr.sa_data[0])
300				duparg("address", *argv);
301			if (ll_addr_a2n(ifr.ifr_hwaddr.sa_data,
302					14, *argv) < 0) {
303				fprintf(stderr, "Error: \"%s\" is not a legal ll address.\n", *argv);
304				exit(1);
305			}
306		}
307		argc--; argv++;
308	}
309	if (ifr.ifr_name[0] == 0) {
310		fprintf(stderr, "Not enough information: \"dev\" is required.\n");
311		exit(-1);
312	}
313
314	fd = socket(AF_INET, SOCK_DGRAM, 0);
315	if (fd < 0) {
316		perror("Cannot create socket");
317		exit(1);
318	}
319	if (ioctl(fd, cmd, (char*)&ifr) != 0) {
320		perror("ioctl");
321		exit(1);
322	}
323	close(fd);
324
325	exit(0);
326}
327
328
329int do_multiaddr(int argc, char **argv)
330{
331	if (argc < 1)
332		return multiaddr_list(0, NULL);
333	if (matches(*argv, "add") == 0)
334		return multiaddr_modify(RTM_NEWADDR, argc-1, argv+1);
335	if (matches(*argv, "delete") == 0)
336		return multiaddr_modify(RTM_DELADDR, argc-1, argv+1);
337	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
338	    || matches(*argv, "lst") == 0)
339		return multiaddr_list(argc-1, argv+1);
340	if (matches(*argv, "help") == 0)
341		usage();
342	fprintf(stderr, "Command \"%s\" is unknown, try \"ip maddr help\".\n", *argv);
343	exit(-1);
344}
345