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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 <fcntl.h> | |
17 | #include <sys/ioctl.h> | |
18 | #include <sys/socket.h> | |
19 | #include <netinet/in.h> | |
20 | #include <arpa/inet.h> | |
21 | #include <string.h> | |
22 | ||
23 | #include <linux/netdevice.h> | |
24 | #include <linux/if.h> | |
25 | #include <linux/if_arp.h> | |
26 | #include <linux/sockios.h> | |
27 | ||
28 | #include "rt_names.h" | |
29 | #include "utils.h" | |
30 | #include "ip_common.h" | |
31 | #include "json_print.h" | |
32 | ||
33 | static struct { | |
34 | char *dev; | |
35 | int family; | |
36 | } filter; | |
37 | ||
38 | static void usage(void) __attribute__((noreturn)); | |
39 | ||
40 | static void usage(void) | |
41 | { | |
42 | fprintf(stderr, "Usage: ip maddr [ add | del ] MULTIADDR dev STRING\n"); | |
43 | fprintf(stderr, " ip maddr show [ dev STRING ]\n"); | |
44 | exit(-1); | |
45 | } | |
46 | ||
47 | static int parse_hex(char *str, unsigned char *addr, size_t size) | |
48 | { | |
49 | int len = 0; | |
50 | ||
51 | while (*str && (len < 2 * size)) { | |
52 | int tmp; | |
53 | ||
54 | if (str[1] == 0) | |
55 | return -1; | |
56 | if (sscanf(str, "%02x", &tmp) != 1) | |
57 | return -1; | |
58 | addr[len] = tmp; | |
59 | len++; | |
60 | str += 2; | |
61 | } | |
62 | return len; | |
63 | } | |
64 | ||
65 | struct ma_info { | |
66 | struct ma_info *next; | |
67 | int index; | |
68 | int users; | |
69 | char *features; | |
70 | char name[IFNAMSIZ]; | |
71 | inet_prefix addr; | |
72 | }; | |
73 | ||
74 | static void maddr_ins(struct ma_info **lst, struct ma_info *m) | |
75 | { | |
76 | struct ma_info *mp; | |
77 | ||
78 | for (; (mp = *lst) != NULL; lst = &mp->next) { | |
79 | if (mp->index > m->index) | |
80 | break; | |
81 | } | |
82 | m->next = *lst; | |
83 | *lst = m; | |
84 | } | |
85 | ||
86 | static void read_dev_mcast(struct ma_info **result_p) | |
87 | { | |
88 | char buf[256]; | |
89 | FILE *fp = fopen("/proc/net/dev_mcast", "r"); | |
90 | ||
91 | if (!fp) | |
92 | return; | |
93 | ||
94 | while (fgets(buf, sizeof(buf), fp)) { | |
95 | char hexa[256]; | |
96 | struct ma_info m = { .addr.family = AF_PACKET }; | |
97 | int len; | |
98 | int st; | |
99 | ||
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 | len = parse_hex(hexa, (unsigned char *)&m.addr.data, sizeof(m.addr.data)); | |
106 | if (len >= 0) { | |
107 | struct ma_info *ma = malloc(sizeof(m)); | |
108 | ||
109 | memcpy(ma, &m, sizeof(m)); | |
110 | ma->addr.bytelen = len; | |
111 | ma->addr.bitlen = len<<3; | |
112 | if (st) | |
113 | ma->features = "static"; | |
114 | maddr_ins(result_p, ma); | |
115 | } | |
116 | } | |
117 | fclose(fp); | |
118 | } | |
119 | ||
120 | static void read_igmp(struct ma_info **result_p) | |
121 | { | |
122 | struct ma_info m = { | |
123 | .addr.family = AF_INET, | |
124 | .addr.bitlen = 32, | |
125 | .addr.bytelen = 4, | |
126 | }; | |
127 | char buf[256]; | |
128 | FILE *fp = fopen("/proc/net/igmp", "r"); | |
129 | ||
130 | if (!fp) | |
131 | return; | |
132 | if (!fgets(buf, sizeof(buf), fp)) { | |
133 | fclose(fp); | |
134 | return; | |
135 | } | |
136 | ||
137 | while (fgets(buf, sizeof(buf), fp)) { | |
138 | struct ma_info *ma; | |
139 | ||
140 | if (buf[0] != '\t') { | |
141 | size_t len; | |
142 | ||
143 | sscanf(buf, "%d%s", &m.index, m.name); | |
144 | len = strlen(m.name); | |
145 | if (m.name[len - 1] == ':') | |
146 | m.name[len - 1] = '\0'; | |
147 | continue; | |
148 | } | |
149 | ||
150 | if (filter.dev && strcmp(filter.dev, m.name)) | |
151 | continue; | |
152 | ||
153 | sscanf(buf, "%08x%d", (__u32 *)&m.addr.data, &m.users); | |
154 | ||
155 | ma = malloc(sizeof(m)); | |
156 | memcpy(ma, &m, sizeof(m)); | |
157 | maddr_ins(result_p, ma); | |
158 | } | |
159 | fclose(fp); | |
160 | } | |
161 | ||
162 | ||
163 | static void read_igmp6(struct ma_info **result_p) | |
164 | { | |
165 | char buf[256]; | |
166 | FILE *fp = fopen("/proc/net/igmp6", "r"); | |
167 | ||
168 | if (!fp) | |
169 | return; | |
170 | ||
171 | while (fgets(buf, sizeof(buf), fp)) { | |
172 | char hexa[256]; | |
173 | struct ma_info m = { .addr.family = AF_INET6 }; | |
174 | int len; | |
175 | ||
176 | sscanf(buf, "%d%s%s%d", &m.index, m.name, hexa, &m.users); | |
177 | ||
178 | if (filter.dev && strcmp(filter.dev, m.name)) | |
179 | continue; | |
180 | ||
181 | len = parse_hex(hexa, (unsigned char *)&m.addr.data, sizeof(m.addr.data)); | |
182 | if (len >= 0) { | |
183 | struct ma_info *ma = malloc(sizeof(m)); | |
184 | ||
185 | memcpy(ma, &m, sizeof(m)); | |
186 | ||
187 | ma->addr.bytelen = len; | |
188 | ma->addr.bitlen = len<<3; | |
189 | maddr_ins(result_p, ma); | |
190 | } | |
191 | } | |
192 | fclose(fp); | |
193 | } | |
194 | ||
195 | static void print_maddr(FILE *fp, struct ma_info *list) | |
196 | { | |
197 | print_string(PRINT_FP, NULL, "\t", NULL); | |
198 | ||
199 | open_json_object(NULL); | |
200 | if (list->addr.family == AF_PACKET) { | |
201 | SPRINT_BUF(b1); | |
202 | ||
203 | print_string(PRINT_FP, NULL, "link ", NULL); | |
204 | print_color_string(PRINT_ANY, COLOR_MAC, "link", "%s", | |
205 | ll_addr_n2a((void *)list->addr.data, list->addr.bytelen, | |
206 | 0, b1, sizeof(b1))); | |
207 | } else { | |
208 | print_string(PRINT_ANY, "family", "%-5s ", | |
209 | family_name(list->addr.family)); | |
210 | print_color_string(PRINT_ANY, ifa_family_color(list->addr.family), | |
211 | "address", "%s", | |
212 | format_host(list->addr.family, | |
213 | -1, list->addr.data)); | |
214 | } | |
215 | ||
216 | if (list->users != 1) | |
217 | print_uint(PRINT_ANY, "users", " users %u", list->users); | |
218 | ||
219 | if (list->features) | |
220 | print_string(PRINT_ANY, "features", " %s", list->features); | |
221 | ||
222 | print_string(PRINT_FP, NULL, "\n", NULL); | |
223 | close_json_object(); | |
224 | } | |
225 | ||
226 | static void print_mlist(FILE *fp, struct ma_info *list) | |
227 | { | |
228 | int cur_index = 0; | |
229 | ||
230 | new_json_obj(json); | |
231 | for (; list; list = list->next) { | |
232 | ||
233 | if (list->index != cur_index || oneline) { | |
234 | if (cur_index) { | |
235 | close_json_array(PRINT_JSON, NULL); | |
236 | close_json_object(); | |
237 | } | |
238 | open_json_object(NULL); | |
239 | ||
240 | print_uint(PRINT_ANY, "ifindex", "%d:", list->index); | |
241 | print_color_string(PRINT_ANY, COLOR_IFNAME, | |
242 | "ifname", "\t%s", list->name); | |
243 | print_nl(); | |
244 | cur_index = list->index; | |
245 | ||
246 | open_json_array(PRINT_JSON, "maddr"); | |
247 | } | |
248 | ||
249 | print_maddr(fp, list); | |
250 | } | |
251 | if (cur_index) { | |
252 | close_json_array(PRINT_JSON, NULL); | |
253 | close_json_object(); | |
254 | } | |
255 | ||
256 | delete_json_obj(); | |
257 | } | |
258 | ||
259 | static int multiaddr_list(int argc, char **argv) | |
260 | { | |
261 | struct ma_info *list = NULL; | |
262 | ||
263 | if (!filter.family) | |
264 | filter.family = preferred_family; | |
265 | ||
266 | while (argc > 0) { | |
267 | if (1) { | |
268 | if (strcmp(*argv, "dev") == 0) { | |
269 | NEXT_ARG(); | |
270 | } else if (matches(*argv, "help") == 0) | |
271 | usage(); | |
272 | if (filter.dev) | |
273 | duparg2("dev", *argv); | |
274 | filter.dev = *argv; | |
275 | } | |
276 | argv++; argc--; | |
277 | } | |
278 | ||
279 | if (!filter.family || filter.family == AF_PACKET) | |
280 | read_dev_mcast(&list); | |
281 | if (!filter.family || filter.family == AF_INET) | |
282 | read_igmp(&list); | |
283 | if (!filter.family || filter.family == AF_INET6) | |
284 | read_igmp6(&list); | |
285 | print_mlist(stdout, list); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static int multiaddr_modify(int cmd, int argc, char **argv) | |
290 | { | |
291 | struct ifreq ifr = {}; | |
292 | int family; | |
293 | int fd; | |
294 | ||
295 | if (cmd == RTM_NEWADDR) | |
296 | cmd = SIOCADDMULTI; | |
297 | else | |
298 | cmd = SIOCDELMULTI; | |
299 | ||
300 | while (argc > 0) { | |
301 | if (strcmp(*argv, "dev") == 0) { | |
302 | NEXT_ARG(); | |
303 | if (ifr.ifr_name[0]) | |
304 | duparg("dev", *argv); | |
305 | if (get_ifname(ifr.ifr_name, *argv)) | |
306 | invarg("\"dev\" not a valid ifname", *argv); | |
307 | } else { | |
308 | if (matches(*argv, "address") == 0) { | |
309 | NEXT_ARG(); | |
310 | } | |
311 | if (matches(*argv, "help") == 0) | |
312 | usage(); | |
313 | if (ifr.ifr_hwaddr.sa_data[0]) | |
314 | duparg("address", *argv); | |
315 | if (ll_addr_a2n(ifr.ifr_hwaddr.sa_data, | |
316 | 14, *argv) < 0) { | |
317 | fprintf(stderr, "Error: \"%s\" is not a legal ll address.\n", *argv); | |
318 | exit(1); | |
319 | } | |
320 | } | |
321 | argc--; argv++; | |
322 | } | |
323 | if (ifr.ifr_name[0] == 0) { | |
324 | fprintf(stderr, "Not enough information: \"dev\" is required.\n"); | |
325 | exit(-1); | |
326 | } | |
327 | ||
328 | switch (preferred_family) { | |
329 | case AF_INET6: | |
330 | case AF_PACKET: | |
331 | case AF_INET: | |
332 | family = preferred_family; | |
333 | break; | |
334 | default: | |
335 | family = AF_INET; | |
336 | } | |
337 | ||
338 | fd = socket(family, SOCK_DGRAM, 0); | |
339 | if (fd < 0) { | |
340 | perror("Cannot create socket"); | |
341 | exit(1); | |
342 | } | |
343 | if (ioctl(fd, cmd, (char *)&ifr) != 0) { | |
344 | perror("ioctl"); | |
345 | exit(1); | |
346 | } | |
347 | close(fd); | |
348 | ||
349 | exit(0); | |
350 | } | |
351 | ||
352 | ||
353 | int do_multiaddr(int argc, char **argv) | |
354 | { | |
355 | if (argc < 1) | |
356 | return multiaddr_list(0, NULL); | |
357 | if (matches(*argv, "add") == 0) | |
358 | return multiaddr_modify(RTM_NEWADDR, argc-1, argv+1); | |
359 | if (matches(*argv, "delete") == 0) | |
360 | return multiaddr_modify(RTM_DELADDR, argc-1, argv+1); | |
361 | if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0 | |
362 | || matches(*argv, "lst") == 0) | |
363 | return multiaddr_list(argc-1, argv+1); | |
364 | if (matches(*argv, "help") == 0) | |
365 | usage(); | |
366 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip maddr help\".\n", *argv); | |
367 | exit(-1); | |
368 | } |