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Commit | Line | Data |
---|---|---|
cad53b3f JB |
1 | /* |
2 | * nl80211 userspace tool | |
3 | * | |
2a1fced2 | 4 | * Copyright 2007, 2008 Johannes Berg <johannes@sipsolutions.net> |
cad53b3f JB |
5 | */ |
6 | ||
7 | #include <errno.h> | |
8 | #include <stdio.h> | |
d5ac8ad3 | 9 | #include <string.h> |
bd396f2a JB |
10 | #include <net/if.h> |
11 | #include <sys/types.h> | |
12 | #include <sys/stat.h> | |
13 | #include <fcntl.h> | |
14 | #include <unistd.h> | |
27c49ed6 | 15 | #include <stdbool.h> |
c551449a | 16 | |
cad53b3f JB |
17 | #include <netlink/genl/genl.h> |
18 | #include <netlink/genl/family.h> | |
c551449a | 19 | #include <netlink/genl/ctrl.h> |
cad53b3f JB |
20 | #include <netlink/msg.h> |
21 | #include <netlink/attr.h> | |
cad53b3f | 22 | |
f408e01b | 23 | #include "nl80211.h" |
cad53b3f JB |
24 | #include "iw.h" |
25 | ||
ded667b0 YY |
26 | /* libnl 1.x compatibility code */ |
27 | #if !defined(CONFIG_LIBNL20) && !defined(CONFIG_LIBNL30) | |
dfd13ee5 PE |
28 | static inline struct nl_handle *nl_socket_alloc(void) |
29 | { | |
30 | return nl_handle_alloc(); | |
31 | } | |
32 | ||
57077d64 | 33 | static inline void nl_socket_free(struct nl_sock *h) |
dfd13ee5 PE |
34 | { |
35 | nl_handle_destroy(h); | |
36 | } | |
ded667b0 | 37 | #endif /* CONFIG_LIBNL20 && CONFIG_LIBNL30 */ |
dfd13ee5 | 38 | |
957a0f07 | 39 | int iw_debug = 0; |
cad53b3f JB |
40 | |
41 | static int nl80211_init(struct nl80211_state *state) | |
42 | { | |
43 | int err; | |
44 | ||
57077d64 PE |
45 | state->nl_sock = nl_socket_alloc(); |
46 | if (!state->nl_sock) { | |
47 | fprintf(stderr, "Failed to allocate netlink socket.\n"); | |
cad53b3f JB |
48 | return -ENOMEM; |
49 | } | |
50 | ||
57077d64 | 51 | if (genl_connect(state->nl_sock)) { |
cad53b3f JB |
52 | fprintf(stderr, "Failed to connect to generic netlink.\n"); |
53 | err = -ENOLINK; | |
54 | goto out_handle_destroy; | |
55 | } | |
56 | ||
f09cee6d JB |
57 | state->nl80211_id = genl_ctrl_resolve(state->nl_sock, "nl80211"); |
58 | if (state->nl80211_id < 0) { | |
cad53b3f JB |
59 | fprintf(stderr, "nl80211 not found.\n"); |
60 | err = -ENOENT; | |
f09cee6d | 61 | goto out_handle_destroy; |
cad53b3f JB |
62 | } |
63 | ||
64 | return 0; | |
65 | ||
cad53b3f | 66 | out_handle_destroy: |
57077d64 | 67 | nl_socket_free(state->nl_sock); |
cad53b3f JB |
68 | return err; |
69 | } | |
70 | ||
71 | static void nl80211_cleanup(struct nl80211_state *state) | |
72 | { | |
57077d64 | 73 | nl_socket_free(state->nl_sock); |
cad53b3f JB |
74 | } |
75 | ||
403b9c83 JB |
76 | static int cmd_size; |
77 | ||
4698bfc2 JB |
78 | extern struct cmd __start___cmd; |
79 | extern struct cmd __stop___cmd; | |
80 | ||
81 | #define for_each_cmd(_cmd) \ | |
82 | for (_cmd = &__start___cmd; _cmd < &__stop___cmd; \ | |
83 | _cmd = (const struct cmd *)((char *)_cmd + cmd_size)) | |
84 | ||
85 | ||
86 | static void __usage_cmd(const struct cmd *cmd, char *indent, bool full) | |
3bb116da | 87 | { |
01ae06f9 JB |
88 | const char *start, *lend, *end; |
89 | ||
bd663893 | 90 | printf("%s", indent); |
4f0cae73 | 91 | |
3bb116da JB |
92 | switch (cmd->idby) { |
93 | case CIB_NONE: | |
3bb116da JB |
94 | break; |
95 | case CIB_PHY: | |
bd663893 | 96 | printf("phy <phyname> "); |
3bb116da JB |
97 | break; |
98 | case CIB_NETDEV: | |
bd663893 | 99 | printf("dev <devname> "); |
3bb116da | 100 | break; |
290a3dd4 JB |
101 | case CIB_WDEV: |
102 | printf("wdev <idx> "); | |
103 | break; | |
3bb116da | 104 | } |
4698bfc2 JB |
105 | if (cmd->parent && cmd->parent->name) |
106 | printf("%s ", cmd->parent->name); | |
bd663893 | 107 | printf("%s", cmd->name); |
3bb116da | 108 | if (cmd->args) |
bd663893 HS |
109 | printf(" %s", cmd->args); |
110 | printf("\n"); | |
01ae06f9 JB |
111 | |
112 | if (!full || !cmd->help) | |
113 | return; | |
114 | ||
115 | /* hack */ | |
116 | if (strlen(indent)) | |
117 | indent = "\t\t"; | |
118 | else | |
bd663893 | 119 | printf("\n"); |
01ae06f9 JB |
120 | |
121 | /* print line by line */ | |
122 | start = cmd->help; | |
123 | end = strchr(start, '\0'); | |
124 | do { | |
125 | lend = strchr(start, '\n'); | |
126 | if (!lend) | |
127 | lend = end; | |
bd663893 HS |
128 | printf("%s", indent); |
129 | printf("%.*s\n", (int)(lend - start), start); | |
01ae06f9 JB |
130 | start = lend + 1; |
131 | } while (end != lend); | |
132 | ||
bd663893 | 133 | printf("\n"); |
3bb116da JB |
134 | } |
135 | ||
4f0cae73 JB |
136 | static void usage_options(void) |
137 | { | |
bd663893 HS |
138 | printf("Options:\n"); |
139 | printf("\t--debug\t\tenable netlink debugging\n"); | |
4f0cae73 JB |
140 | } |
141 | ||
01ae06f9 JB |
142 | static const char *argv0; |
143 | ||
f3ac8bf1 | 144 | static void usage(int argc, char **argv) |
bd396f2a | 145 | { |
4698bfc2 | 146 | const struct cmd *section, *cmd; |
f3ac8bf1 JB |
147 | bool full = argc >= 0; |
148 | const char *sect_filt = NULL; | |
149 | const char *cmd_filt = NULL; | |
150 | ||
151 | if (argc > 0) | |
152 | sect_filt = argv[0]; | |
153 | ||
154 | if (argc > 1) | |
155 | cmd_filt = argv[1]; | |
bd396f2a | 156 | |
bd663893 | 157 | printf("Usage:\t%s [options] command\n", argv0); |
4f0cae73 | 158 | usage_options(); |
bd663893 HS |
159 | printf("\t--version\tshow version (%s)\n", iw_version); |
160 | printf("Commands:\n"); | |
4698bfc2 JB |
161 | for_each_cmd(section) { |
162 | if (section->parent) | |
403b9c83 | 163 | continue; |
4698bfc2 | 164 | |
f3ac8bf1 JB |
165 | if (sect_filt && strcmp(section->name, sect_filt)) |
166 | continue; | |
167 | ||
4698bfc2 JB |
168 | if (section->handler && !section->hidden) |
169 | __usage_cmd(section, "\t", full); | |
170 | ||
171 | for_each_cmd(cmd) { | |
172 | if (section != cmd->parent) | |
173 | continue; | |
174 | if (!cmd->handler || cmd->hidden) | |
175 | continue; | |
f3ac8bf1 JB |
176 | if (cmd_filt && strcmp(cmd->name, cmd_filt)) |
177 | continue; | |
4698bfc2 JB |
178 | __usage_cmd(cmd, "\t", full); |
179 | } | |
bd396f2a | 180 | } |
75f4204c JB |
181 | printf("\nCommands that use the netdev ('dev') can also be given the\n" |
182 | "'wdev' instead to identify the device.\n"); | |
bd663893 | 183 | printf("\nYou can omit the 'phy' or 'dev' if " |
f4ec76d0 | 184 | "the identification is unique,\n" |
8aefee9a | 185 | "e.g. \"iw wlan0 info\" or \"iw phy0 info\". " |
fbdb8d05 JB |
186 | "(Don't when scripting.)\n\n" |
187 | "Do NOT screenscrape this tool, we don't " | |
188 | "consider its output stable.\n\n"); | |
bd396f2a JB |
189 | } |
190 | ||
01ae06f9 JB |
191 | static int print_help(struct nl80211_state *state, |
192 | struct nl_cb *cb, | |
193 | struct nl_msg *msg, | |
05514f95 JB |
194 | int argc, char **argv, |
195 | enum id_input id) | |
01ae06f9 JB |
196 | { |
197 | exit(3); | |
198 | } | |
f3ac8bf1 JB |
199 | TOPLEVEL(help, "[command]", 0, 0, CIB_NONE, print_help, |
200 | "Print usage for all or a specific command, e.g.\n" | |
201 | "\"help wowlan\" or \"help wowlan enable\"."); | |
01ae06f9 | 202 | |
4698bfc2 | 203 | static void usage_cmd(const struct cmd *cmd) |
4f0cae73 | 204 | { |
bd663893 | 205 | printf("Usage:\t%s [options] ", argv0); |
01ae06f9 | 206 | __usage_cmd(cmd, "", true); |
4f0cae73 JB |
207 | usage_options(); |
208 | } | |
209 | ||
d711f013 JB |
210 | static void version(void) |
211 | { | |
133b069f | 212 | printf("iw version %s\n", iw_version); |
d711f013 JB |
213 | } |
214 | ||
bd396f2a JB |
215 | static int phy_lookup(char *name) |
216 | { | |
217 | char buf[200]; | |
218 | int fd, pos; | |
219 | ||
220 | snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", name); | |
221 | ||
222 | fd = open(buf, O_RDONLY); | |
989e97c2 JB |
223 | if (fd < 0) |
224 | return -1; | |
bd396f2a | 225 | pos = read(fd, buf, sizeof(buf) - 1); |
8f253ee2 ES |
226 | if (pos < 0) { |
227 | close(fd); | |
bd396f2a | 228 | return -1; |
8f253ee2 | 229 | } |
bd396f2a | 230 | buf[pos] = '\0'; |
8f253ee2 | 231 | close(fd); |
bd396f2a JB |
232 | return atoi(buf); |
233 | } | |
234 | ||
70391ccf JB |
235 | static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, |
236 | void *arg) | |
237 | { | |
238 | int *ret = arg; | |
239 | *ret = err->error; | |
240 | return NL_STOP; | |
241 | } | |
242 | ||
561c5b7e JB |
243 | static int finish_handler(struct nl_msg *msg, void *arg) |
244 | { | |
59c418c0 JB |
245 | int *ret = arg; |
246 | *ret = 0; | |
561c5b7e JB |
247 | return NL_SKIP; |
248 | } | |
249 | ||
250 | static int ack_handler(struct nl_msg *msg, void *arg) | |
70391ccf JB |
251 | { |
252 | int *ret = arg; | |
253 | *ret = 0; | |
254 | return NL_STOP; | |
255 | } | |
256 | ||
4f0cae73 | 257 | static int __handle_cmd(struct nl80211_state *state, enum id_input idby, |
4698bfc2 | 258 | int argc, char **argv, const struct cmd **cmdout) |
45c7212c | 259 | { |
4698bfc2 | 260 | const struct cmd *cmd, *match = NULL, *sectcmd; |
7c37a24d | 261 | struct nl_cb *cb; |
5cb60f91 | 262 | struct nl_cb *s_cb; |
bd396f2a | 263 | struct nl_msg *msg; |
290a3dd4 | 264 | signed long long devidx = 0; |
bb60b4ae | 265 | int err, o_argc; |
bd396f2a | 266 | const char *command, *section; |
bb60b4ae | 267 | char *tmp, **o_argv; |
9927363c | 268 | enum command_identify_by command_idby = CIB_NONE; |
45c7212c | 269 | |
9927363c | 270 | if (argc <= 1 && idby != II_NONE) |
5e75fd04 | 271 | return 1; |
45c7212c | 272 | |
bb60b4ae JB |
273 | o_argc = argc; |
274 | o_argv = argv; | |
275 | ||
bd396f2a | 276 | switch (idby) { |
9927363c JB |
277 | case II_PHY_IDX: |
278 | command_idby = CIB_PHY; | |
279 | devidx = strtoul(*argv + 4, &tmp, 0); | |
280 | if (*tmp != '\0') | |
281 | return 1; | |
282 | argc--; | |
283 | argv++; | |
284 | break; | |
285 | case II_PHY_NAME: | |
286 | command_idby = CIB_PHY; | |
bd396f2a JB |
287 | devidx = phy_lookup(*argv); |
288 | argc--; | |
289 | argv++; | |
290 | break; | |
9927363c JB |
291 | case II_NETDEV: |
292 | command_idby = CIB_NETDEV; | |
bd396f2a | 293 | devidx = if_nametoindex(*argv); |
989e97c2 JB |
294 | if (devidx == 0) |
295 | devidx = -1; | |
bd396f2a JB |
296 | argc--; |
297 | argv++; | |
298 | break; | |
290a3dd4 JB |
299 | case II_WDEV: |
300 | command_idby = CIB_WDEV; | |
301 | devidx = strtoll(*argv, &tmp, 0); | |
302 | if (*tmp != '\0') | |
303 | return 1; | |
304 | argc--; | |
305 | argv++; | |
bd396f2a JB |
306 | default: |
307 | break; | |
308 | } | |
309 | ||
989e97c2 JB |
310 | if (devidx < 0) |
311 | return -errno; | |
312 | ||
4698bfc2 | 313 | section = *argv; |
bd396f2a JB |
314 | argc--; |
315 | argv++; | |
316 | ||
4698bfc2 JB |
317 | for_each_cmd(sectcmd) { |
318 | if (sectcmd->parent) | |
403b9c83 | 319 | continue; |
4698bfc2 JB |
320 | /* ok ... bit of a hack for the dupe 'info' section */ |
321 | if (match && sectcmd->idby != command_idby) | |
bd396f2a | 322 | continue; |
4698bfc2 JB |
323 | if (strcmp(sectcmd->name, section) == 0) |
324 | match = sectcmd; | |
bd396f2a | 325 | } |
45c7212c | 326 | |
4698bfc2 JB |
327 | sectcmd = match; |
328 | match = NULL; | |
329 | if (!sectcmd) | |
5e75fd04 | 330 | return 1; |
45c7212c | 331 | |
4698bfc2 JB |
332 | if (argc > 0) { |
333 | command = *argv; | |
334 | ||
335 | for_each_cmd(cmd) { | |
336 | if (!cmd->handler) | |
337 | continue; | |
338 | if (cmd->parent != sectcmd) | |
339 | continue; | |
75f4204c JB |
340 | /* |
341 | * ignore mismatch id by, but allow WDEV | |
342 | * in place of NETDEV | |
343 | */ | |
344 | if (cmd->idby != command_idby && | |
345 | !(cmd->idby == CIB_NETDEV && | |
346 | command_idby == CIB_WDEV)) | |
4698bfc2 JB |
347 | continue; |
348 | if (strcmp(cmd->name, command)) | |
349 | continue; | |
350 | if (argc > 1 && !cmd->args) | |
351 | continue; | |
352 | match = cmd; | |
353 | break; | |
354 | } | |
355 | ||
356 | if (match) { | |
357 | argc--; | |
358 | argv++; | |
359 | } | |
360 | } | |
361 | ||
362 | if (match) | |
363 | cmd = match; | |
364 | else { | |
365 | /* Use the section itself, if possible. */ | |
366 | cmd = sectcmd; | |
367 | if (argc && !cmd->args) | |
368 | return 1; | |
75f4204c JB |
369 | if (cmd->idby != command_idby && |
370 | !(cmd->idby == CIB_NETDEV && command_idby == CIB_WDEV)) | |
4698bfc2 JB |
371 | return 1; |
372 | if (!cmd->handler) | |
373 | return 1; | |
374 | } | |
375 | ||
1633ddf7 JB |
376 | if (cmd->selector) { |
377 | cmd = cmd->selector(argc, argv); | |
378 | if (!cmd) | |
379 | return 1; | |
380 | } | |
381 | ||
4f0cae73 JB |
382 | if (cmdout) |
383 | *cmdout = cmd; | |
384 | ||
bb60b4ae JB |
385 | if (!cmd->cmd) { |
386 | argc = o_argc; | |
387 | argv = o_argv; | |
05514f95 | 388 | return cmd->handler(state, NULL, NULL, argc, argv, idby); |
bb60b4ae JB |
389 | } |
390 | ||
bd396f2a JB |
391 | msg = nlmsg_alloc(); |
392 | if (!msg) { | |
70391ccf JB |
393 | fprintf(stderr, "failed to allocate netlink message\n"); |
394 | return 2; | |
395 | } | |
396 | ||
957a0f07 | 397 | cb = nl_cb_alloc(iw_debug ? NL_CB_DEBUG : NL_CB_DEFAULT); |
5cb60f91 SR |
398 | s_cb = nl_cb_alloc(iw_debug ? NL_CB_DEBUG : NL_CB_DEFAULT); |
399 | if (!cb || !s_cb) { | |
70391ccf JB |
400 | fprintf(stderr, "failed to allocate netlink callbacks\n"); |
401 | err = 2; | |
402 | goto out_free_msg; | |
bd396f2a | 403 | } |
45c7212c | 404 | |
f09cee6d | 405 | genlmsg_put(msg, 0, 0, state->nl80211_id, 0, |
bd396f2a JB |
406 | cmd->nl_msg_flags, cmd->cmd, 0); |
407 | ||
9927363c | 408 | switch (command_idby) { |
bd396f2a JB |
409 | case CIB_PHY: |
410 | NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, devidx); | |
411 | break; | |
412 | case CIB_NETDEV: | |
413 | NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, devidx); | |
414 | break; | |
290a3dd4 JB |
415 | case CIB_WDEV: |
416 | NLA_PUT_U64(msg, NL80211_ATTR_WDEV, devidx); | |
417 | break; | |
bd396f2a JB |
418 | default: |
419 | break; | |
420 | } | |
421 | ||
05514f95 | 422 | err = cmd->handler(state, cb, msg, argc, argv, idby); |
70391ccf JB |
423 | if (err) |
424 | goto out; | |
425 | ||
5cb60f91 SR |
426 | nl_socket_set_cb(state->nl_sock, s_cb); |
427 | ||
57077d64 | 428 | err = nl_send_auto_complete(state->nl_sock, msg); |
70391ccf JB |
429 | if (err < 0) |
430 | goto out; | |
431 | ||
c5c4471a JB |
432 | err = 1; |
433 | ||
70391ccf | 434 | nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err); |
59c418c0 | 435 | nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err); |
561c5b7e | 436 | nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err); |
70391ccf | 437 | |
c5c4471a | 438 | while (err > 0) |
57077d64 | 439 | nl_recvmsgs(state->nl_sock, cb); |
70391ccf JB |
440 | out: |
441 | nl_cb_put(cb); | |
442 | out_free_msg: | |
443 | nlmsg_free(msg); | |
444 | return err; | |
bd396f2a JB |
445 | nla_put_failure: |
446 | fprintf(stderr, "building message failed\n"); | |
70391ccf | 447 | return 2; |
45c7212c JB |
448 | } |
449 | ||
4f0cae73 JB |
450 | int handle_cmd(struct nl80211_state *state, enum id_input idby, |
451 | int argc, char **argv) | |
452 | { | |
453 | return __handle_cmd(state, idby, argc, argv, NULL); | |
454 | } | |
455 | ||
cad53b3f JB |
456 | int main(int argc, char **argv) |
457 | { | |
458 | struct nl80211_state nlstate; | |
bd396f2a | 459 | int err; |
4698bfc2 | 460 | const struct cmd *cmd = NULL; |
cad53b3f | 461 | |
f408e01b | 462 | /* calculate command size including padding */ |
4698bfc2 | 463 | cmd_size = abs((long)&__section_set - (long)&__section_get); |
45c7212c JB |
464 | /* strip off self */ |
465 | argc--; | |
1cdd9016 MK |
466 | argv0 = *argv++; |
467 | ||
59c49f09 | 468 | if (argc > 0 && strcmp(*argv, "--debug") == 0) { |
957a0f07 | 469 | iw_debug = 1; |
59c49f09 JB |
470 | argc--; |
471 | argv++; | |
472 | } | |
473 | ||
d711f013 JB |
474 | if (argc > 0 && strcmp(*argv, "--version") == 0) { |
475 | version(); | |
476 | return 0; | |
477 | } | |
478 | ||
01ae06f9 | 479 | /* need to treat "help" command specially so it works w/o nl80211 */ |
bd396f2a | 480 | if (argc == 0 || strcmp(*argv, "help") == 0) { |
f3ac8bf1 | 481 | usage(argc - 1, argv + 1); |
4a972f80 | 482 | return 0; |
1cdd9016 | 483 | } |
45c7212c | 484 | |
2bdb6bd1 JB |
485 | err = nl80211_init(&nlstate); |
486 | if (err) | |
487 | return 1; | |
488 | ||
957a0f07 | 489 | if (strcmp(*argv, "dev") == 0 && argc > 1) { |
14a0380d LR |
490 | argc--; |
491 | argv++; | |
4f0cae73 | 492 | err = __handle_cmd(&nlstate, II_NETDEV, argc, argv, &cmd); |
811ec68f | 493 | } else if (strncmp(*argv, "phy", 3) == 0 && argc > 1) { |
9927363c JB |
494 | if (strlen(*argv) == 3) { |
495 | argc--; | |
496 | argv++; | |
4f0cae73 | 497 | err = __handle_cmd(&nlstate, II_PHY_NAME, argc, argv, &cmd); |
9927363c | 498 | } else if (*(*argv + 3) == '#') |
4f0cae73 | 499 | err = __handle_cmd(&nlstate, II_PHY_IDX, argc, argv, &cmd); |
9927363c | 500 | else |
f4ec76d0 | 501 | goto detect; |
290a3dd4 JB |
502 | } else if (strcmp(*argv, "wdev") == 0 && argc > 1) { |
503 | argc--; | |
504 | argv++; | |
505 | err = __handle_cmd(&nlstate, II_WDEV, argc, argv, &cmd); | |
f4ec76d0 JB |
506 | } else { |
507 | int idx; | |
508 | enum id_input idby = II_NONE; | |
509 | detect: | |
510 | if ((idx = if_nametoindex(argv[0])) != 0) | |
511 | idby = II_NETDEV; | |
66f8ca45 | 512 | else if ((idx = phy_lookup(argv[0])) >= 0) |
f4ec76d0 JB |
513 | idby = II_PHY_NAME; |
514 | err = __handle_cmd(&nlstate, idby, argc, argv, &cmd); | |
515 | } | |
45c7212c | 516 | |
4f0cae73 JB |
517 | if (err == 1) { |
518 | if (cmd) | |
01ae06f9 | 519 | usage_cmd(cmd); |
4f0cae73 | 520 | else |
f3ac8bf1 | 521 | usage(0, NULL); |
4f0cae73 | 522 | } else if (err < 0) |
b49be3e1 | 523 | fprintf(stderr, "command failed: %s (%d)\n", strerror(-err), err); |
cad53b3f JB |
524 | |
525 | nl80211_cleanup(&nlstate); | |
526 | ||
45c7212c | 527 | return err; |
cad53b3f | 528 | } |