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move device settings to a separate struct
[project/netifd.git] / proto-shell.c
1 #define _GNU_SOURCE
2
3 #include <string.h>
4 #include <stdlib.h>
5 #include <stdio.h>
6 #include <glob.h>
7 #include <unistd.h>
8 #include <fcntl.h>
9 #include <signal.h>
10
11 #include <arpa/inet.h>
12 #include <netinet/in.h>
13
14 #include <libubox/blobmsg_json.h>
15
16 #include "netifd.h"
17 #include "interface.h"
18 #include "interface-ip.h"
19 #include "proto.h"
20
21 static struct netifd_fd proto_fd;
22
23 enum proto_shell_sm {
24 S_IDLE,
25 S_SETUP,
26 S_SETUP_ABORT,
27 S_TEARDOWN,
28 };
29
30 struct proto_shell_handler {
31 struct list_head list;
32 struct proto_handler proto;
33 struct config_param_list config;
34 char *config_buf;
35 bool init_available;
36 char script_name[];
37 };
38
39 struct proto_shell_state {
40 struct interface_proto_state proto;
41 struct proto_shell_handler *handler;
42 struct blob_attr *config;
43
44 struct device_user l3_dev;
45
46 struct uloop_timeout teardown_timeout;
47
48 struct netifd_process setup_task;
49 struct netifd_process teardown_task;
50 struct netifd_process proto_task;
51
52 enum proto_shell_sm sm;
53 bool proto_task_killed;
54
55 int last_error;
56 };
57
58 static int
59 proto_shell_handler(struct interface_proto_state *proto,
60 enum interface_proto_cmd cmd, bool force)
61 {
62 struct proto_shell_state *state;
63 struct proto_shell_handler *handler;
64 struct netifd_process *proc;
65 static char error_buf[32];
66 const char *argv[7];
67 char *envp[2];
68 const char *action;
69 char *config;
70 int ret, i = 0, j = 0;
71
72 state = container_of(proto, struct proto_shell_state, proto);
73 handler = state->handler;
74
75 if (cmd == PROTO_CMD_SETUP) {
76 action = "setup";
77 proc = &state->setup_task;
78 state->last_error = -1;
79 } else {
80 if (state->sm == S_TEARDOWN)
81 return 0;
82
83 if (state->setup_task.uloop.pending) {
84 if (state->sm != S_SETUP_ABORT) {
85 uloop_timeout_set(&state->teardown_timeout, 1000);
86 kill(state->setup_task.uloop.pid, SIGTERM);
87 if (state->proto_task.uloop.pending)
88 kill(state->proto_task.uloop.pid, SIGTERM);
89 state->sm = S_SETUP_ABORT;
90 }
91 return 0;
92 }
93
94 action = "teardown";
95 proc = &state->teardown_task;
96 state->sm = S_TEARDOWN;
97 if (state->last_error >= 0) {
98 snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
99 envp[j++] = error_buf;
100 }
101 uloop_timeout_set(&state->teardown_timeout, 5000);
102 }
103
104 config = blobmsg_format_json(state->config, true);
105 if (!config)
106 return -1;
107
108 argv[i++] = handler->script_name;
109 argv[i++] = handler->proto.name;
110 argv[i++] = action;
111 argv[i++] = proto->iface->name;
112 argv[i++] = config;
113 if (proto->iface->main_dev.dev)
114 argv[i++] = proto->iface->main_dev.dev->ifname;
115 argv[i] = NULL;
116 envp[j] = NULL;
117
118 ret = netifd_start_process(argv, envp, proc);
119 free(config);
120
121 return ret;
122 }
123
124 static void
125 proto_shell_task_finish(struct proto_shell_state *state,
126 struct netifd_process *task)
127 {
128 switch (state->sm) {
129 case S_IDLE:
130 if (task == &state->proto_task)
131 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
132 /* fall through */
133 case S_SETUP:
134 if (task == &state->proto_task)
135 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
136 false);
137 break;
138
139 case S_SETUP_ABORT:
140 if (state->setup_task.uloop.pending ||
141 state->proto_task.uloop.pending)
142 break;
143
144 uloop_timeout_cancel(&state->teardown_timeout);
145 state->sm = S_IDLE;
146 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
147 break;
148
149 case S_TEARDOWN:
150 if (state->teardown_task.uloop.pending)
151 break;
152
153 if (state->proto_task.uloop.pending) {
154 if (!state->proto_task_killed)
155 kill(state->proto_task.uloop.pid, SIGTERM);
156 break;
157 }
158
159 uloop_timeout_cancel(&state->teardown_timeout);
160 state->sm = S_IDLE;
161 state->proto.proto_event(&state->proto, IFPEV_DOWN);
162 break;
163 }
164 }
165
166 static void
167 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
168 {
169 struct proto_shell_state *state;
170
171 state = container_of(timeout, struct proto_shell_state, teardown_timeout);
172
173 netifd_kill_process(&state->setup_task);
174 netifd_kill_process(&state->proto_task);
175 netifd_kill_process(&state->teardown_task);
176 proto_shell_task_finish(state, NULL);
177 }
178
179 static void
180 proto_shell_setup_cb(struct netifd_process *p, int ret)
181 {
182 struct proto_shell_state *state;
183
184 state = container_of(p, struct proto_shell_state, setup_task);
185 proto_shell_task_finish(state, p);
186 }
187
188 static void
189 proto_shell_teardown_cb(struct netifd_process *p, int ret)
190 {
191 struct proto_shell_state *state;
192
193 state = container_of(p, struct proto_shell_state, teardown_task);
194 proto_shell_task_finish(state, p);
195 }
196
197 static void
198 proto_shell_task_cb(struct netifd_process *p, int ret)
199 {
200 struct proto_shell_state *state;
201
202 state = container_of(p, struct proto_shell_state, proto_task);
203
204 if (state->sm == S_IDLE || state->sm == S_SETUP)
205 state->last_error = WEXITSTATUS(ret);
206
207 proto_shell_task_finish(state, p);
208 }
209
210 static void
211 proto_shell_free(struct interface_proto_state *proto)
212 {
213 struct proto_shell_state *state;
214
215 state = container_of(proto, struct proto_shell_state, proto);
216 free(state->config);
217 free(state);
218 }
219
220 static void
221 proto_shell_parse_addr_list(struct interface_ip_settings *ip, struct blob_attr *attr,
222 bool v6, bool external)
223 {
224 struct device_addr *addr;
225 struct blob_attr *cur;
226 int rem;
227
228 blobmsg_for_each_attr(cur, attr, rem) {
229 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING) {
230 DPRINTF("Ignore wrong address type: %d\n", blobmsg_type(cur));
231 continue;
232 }
233
234 addr = proto_parse_ip_addr_string(blobmsg_data(cur), v6, v6 ? 32 : 128);
235 if (!addr) {
236 DPRINTF("Failed to parse IP address string: %s\n", (char *) blobmsg_data(cur));
237 continue;
238 }
239
240 if (external)
241 addr->flags |= DEVADDR_EXTERNAL;
242
243 vlist_add(&ip->addr, &addr->node);
244 }
245 }
246
247 static void
248 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
249 bool v6)
250 {
251 struct blob_attr *cur;
252 int rem;
253
254 blobmsg_for_each_attr(cur, attr, rem) {
255 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
256 DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
257 continue;
258 }
259
260 interface_ip_add_route(iface, cur, v6);
261 }
262 }
263
264 enum {
265 NOTIFY_ACTION,
266 NOTIFY_ERROR,
267 NOTIFY_COMMAND,
268 NOTIFY_ENV,
269 NOTIFY_SIGNAL,
270 NOTIFY_AVAILABLE,
271 NOTIFY_LINK_UP,
272 NOTIFY_IFNAME,
273 NOTIFY_ADDR_EXT,
274 NOTIFY_IPADDR,
275 NOTIFY_IP6ADDR,
276 NOTIFY_ROUTES,
277 NOTIFY_ROUTES6,
278 NOTIFY_DNS,
279 NOTIFY_DNS_SEARCH,
280 __NOTIFY_LAST
281 };
282
283 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
284 [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
285 [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
286 [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
287 [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
288 [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
289 [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
290 [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
291 [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
292 [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
293 [NOTIFY_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
294 [NOTIFY_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
295 [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
296 [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
297 [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
298 [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
299 };
300
301 static int
302 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr **tb)
303 {
304 struct interface_ip_settings *ip;
305 struct blob_attr *cur;
306 int dev_create = 1;
307 bool addr_ext = false;
308 bool up;
309
310 if (!tb[NOTIFY_LINK_UP])
311 return UBUS_STATUS_INVALID_ARGUMENT;
312
313 up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
314 if (!up) {
315 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
316 return 0;
317 }
318
319 if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
320 addr_ext = blobmsg_get_bool(cur);
321 if (addr_ext)
322 dev_create = 2;
323 }
324
325 if (!tb[NOTIFY_IFNAME]) {
326 if (!state->proto.iface->main_dev.dev)
327 return UBUS_STATUS_INVALID_ARGUMENT;
328 } else {
329 if (state->l3_dev.dev)
330 device_remove_user(&state->l3_dev);
331
332 device_add_user(&state->l3_dev,
333 device_get(blobmsg_data(tb[NOTIFY_IFNAME]), dev_create));
334 state->proto.iface->l3_dev = &state->l3_dev;
335 device_claim(&state->l3_dev);
336 }
337
338 ip = &state->proto.iface->proto_ip;
339 interface_update_start(state->proto.iface);
340
341 if ((cur = tb[NOTIFY_IPADDR]) != NULL)
342 proto_shell_parse_addr_list(ip, cur, false, addr_ext);
343
344 if ((cur = tb[NOTIFY_IP6ADDR]) != NULL)
345 proto_shell_parse_addr_list(ip, cur, true, addr_ext);
346
347 if ((cur = tb[NOTIFY_ROUTES]) != NULL)
348 proto_shell_parse_route_list(state->proto.iface, cur, false);
349
350 if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
351 proto_shell_parse_route_list(state->proto.iface, cur, true);
352
353 if ((cur = tb[NOTIFY_DNS]) != NULL)
354 interface_add_dns_server_list(ip, cur);
355
356 if ((cur = tb[NOTIFY_DNS_SEARCH]) != NULL)
357 interface_add_dns_search_list(ip, cur);
358
359 interface_update_complete(state->proto.iface);
360
361 state->proto.proto_event(&state->proto, IFPEV_UP);
362
363 return 0;
364 }
365
366 static bool
367 fill_string_list(struct blob_attr *attr, char **argv, int max)
368 {
369 struct blob_attr *cur;
370 int argc = 0;
371 int rem;
372
373 if (!attr)
374 goto out;
375
376 blobmsg_for_each_attr(cur, attr, rem) {
377 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
378 return false;
379
380 if (!blobmsg_check_attr(cur, NULL))
381 return false;
382
383 argv[argc++] = blobmsg_data(cur);
384 if (argc == max - 1)
385 return false;
386 }
387
388 out:
389 argv[argc] = NULL;
390 return true;
391 }
392
393 static int
394 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
395 {
396 static char *argv[64];
397 static char *env[32];
398
399 if (!tb[NOTIFY_COMMAND])
400 goto error;
401
402 if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
403 goto error;
404
405 if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
406 goto error;
407
408 netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
409
410 return 0;
411
412 error:
413 return UBUS_STATUS_INVALID_ARGUMENT;
414 }
415
416 static int
417 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
418 {
419 unsigned int signal = ~0;
420
421 if (tb[NOTIFY_SIGNAL])
422 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
423
424 if (signal > 31)
425 signal = SIGTERM;
426
427 if (state->proto_task.uloop.pending) {
428 state->proto_task_killed = true;
429 kill(state->proto_task.uloop.pid, signal);
430 }
431
432 return 0;
433 }
434
435 static int
436 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
437 {
438 struct blob_attr *cur;
439 char *data[16];
440 int n_data = 0;
441 int rem;
442
443 if (!tb[NOTIFY_ERROR])
444 return UBUS_STATUS_INVALID_ARGUMENT;
445
446 blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
447 if (n_data + 1 == ARRAY_SIZE(data))
448 goto error;
449
450 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
451 goto error;
452
453 if (!blobmsg_check_attr(cur, NULL))
454 goto error;
455
456 data[n_data++] = blobmsg_data(cur);
457 }
458
459 if (!n_data)
460 goto error;
461
462 interface_add_error(state->proto.iface, state->handler->proto.name,
463 data[0], (const char **) &data[1], n_data - 1);
464
465 return 0;
466
467 error:
468 return UBUS_STATUS_INVALID_ARGUMENT;
469 }
470
471 static int
472 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
473 {
474 state->proto.iface->autostart = false;
475 return 0;
476 }
477
478 static int
479 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
480 {
481 if (!tb[NOTIFY_AVAILABLE])
482 return UBUS_STATUS_INVALID_ARGUMENT;
483
484 interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
485 return 0;
486 }
487
488 static int
489 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
490 {
491 struct proto_shell_state *state;
492 struct blob_attr *tb[__NOTIFY_LAST];
493
494 state = container_of(proto, struct proto_shell_state, proto);
495
496 blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
497 if (!tb[NOTIFY_ACTION])
498 return UBUS_STATUS_INVALID_ARGUMENT;
499
500 switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
501 case 0:
502 return proto_shell_update_link(state, tb);
503 case 1:
504 return proto_shell_run_command(state, tb);
505 case 2:
506 return proto_shell_kill_command(state, tb);
507 case 3:
508 return proto_shell_notify_error(state, tb);
509 case 4:
510 return proto_shell_block_restart(state, tb);
511 case 5:
512 return proto_shell_set_available(state, tb);
513 default:
514 return UBUS_STATUS_INVALID_ARGUMENT;
515 }
516 }
517
518 static struct interface_proto_state *
519 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
520 struct blob_attr *attr)
521 {
522 struct proto_shell_state *state;
523
524 state = calloc(1, sizeof(*state));
525 state->config = malloc(blob_pad_len(attr));
526 if (!state->config)
527 goto error;
528
529 memcpy(state->config, attr, blob_pad_len(attr));
530 state->proto.free = proto_shell_free;
531 state->proto.notify = proto_shell_notify;
532 state->proto.cb = proto_shell_handler;
533 state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
534 state->setup_task.cb = proto_shell_setup_cb;
535 state->setup_task.dir_fd = proto_fd.fd;
536 state->setup_task.log_prefix = iface->name;
537 state->teardown_task.cb = proto_shell_teardown_cb;
538 state->teardown_task.dir_fd = proto_fd.fd;
539 state->teardown_task.log_prefix = iface->name;
540 state->proto_task.cb = proto_shell_task_cb;
541 state->proto_task.dir_fd = proto_fd.fd;
542 state->proto_task.log_prefix = iface->name;
543 state->handler = container_of(h, struct proto_shell_handler, proto);
544
545 return &state->proto;
546
547 error:
548 free(state);
549 return NULL;
550 }
551
552 static json_object *
553 check_type(json_object *obj, json_type type)
554 {
555 if (!obj)
556 return NULL;
557
558 if (json_object_get_type(obj) != type)
559 return NULL;
560
561 return obj;
562 }
563
564 static inline json_object *
565 get_field(json_object *obj, const char *name, json_type type)
566 {
567 return check_type(json_object_object_get(obj, name), type);
568 }
569
570 static char *
571 proto_shell_parse_config(struct config_param_list *config, json_object *obj)
572 {
573 struct blobmsg_policy *attrs;
574 char *str_buf, *str_cur;
575 int str_len = 0;
576 int i;
577
578 config->n_params = json_object_array_length(obj);
579 attrs = calloc(1, sizeof(*attrs) * config->n_params);
580 if (!attrs)
581 return NULL;
582
583 config->params = attrs;
584 for (i = 0; i < config->n_params; i++) {
585 json_object *cur, *name, *type;
586
587 cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
588 if (!cur)
589 goto error;
590
591 name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
592 if (!name)
593 goto error;
594
595 type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
596 if (!type)
597 goto error;
598
599 attrs[i].name = json_object_get_string(name);
600 attrs[i].type = json_object_get_int(type);
601 if (attrs[i].type > BLOBMSG_TYPE_LAST)
602 goto error;
603
604 str_len += strlen(attrs[i].name) + 1;
605 }
606
607 str_buf = malloc(str_len);
608 if (!str_buf)
609 goto error;
610
611 str_cur = str_buf;
612 for (i = 0; i < config->n_params; i++) {
613 const char *name = attrs[i].name;
614
615 attrs[i].name = str_cur;
616 str_cur += sprintf(str_cur, "%s", name) + 1;
617 }
618
619 return str_buf;
620
621 error:
622 free(attrs);
623 config->n_params = 0;
624 return NULL;
625 }
626
627 static void
628 proto_shell_add_handler(const char *script, json_object *obj)
629 {
630 struct proto_shell_handler *handler;
631 struct proto_handler *proto;
632 json_object *config, *tmp;
633 const char *name;
634 char *str;
635
636 if (!check_type(obj, json_type_object))
637 return;
638
639 tmp = get_field(obj, "name", json_type_string);
640 if (!tmp)
641 return;
642
643 name = json_object_get_string(tmp);
644
645 handler = calloc(1, sizeof(*handler) +
646 strlen(script) + 1 +
647 strlen(name) + 1);
648 if (!handler)
649 return;
650
651 strcpy(handler->script_name, script);
652
653 str = handler->script_name + strlen(handler->script_name) + 1;
654 strcpy(str, name);
655
656 proto = &handler->proto;
657 proto->name = str;
658 proto->config_params = &handler->config;
659 proto->attach = proto_shell_attach;
660
661 tmp = get_field(obj, "no-device", json_type_boolean);
662 if (tmp && json_object_get_boolean(tmp))
663 handler->proto.flags |= PROTO_FLAG_NODEV;
664
665 tmp = get_field(obj, "available", json_type_boolean);
666 if (tmp && json_object_get_boolean(tmp))
667 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
668
669 config = get_field(obj, "config", json_type_array);
670 if (config)
671 handler->config_buf = proto_shell_parse_config(&handler->config, config);
672
673 DPRINTF("Add handler for script %s: %s\n", script, proto->name);
674 add_proto_handler(proto);
675 }
676
677 static void proto_shell_add_script(const char *name)
678 {
679 struct json_tokener *tok = NULL;
680 json_object *obj;
681 static char buf[512];
682 char *start, *cmd;
683 FILE *f;
684 int len;
685
686 #define DUMP_SUFFIX " '' dump"
687
688 cmd = alloca(strlen(name) + 1 + sizeof(DUMP_SUFFIX));
689 sprintf(cmd, "%s" DUMP_SUFFIX, name);
690
691 f = popen(cmd, "r");
692 if (!f)
693 return;
694
695 do {
696 start = fgets(buf, sizeof(buf), f);
697 if (!start)
698 continue;
699
700 len = strlen(start);
701
702 if (!tok)
703 tok = json_tokener_new();
704
705 obj = json_tokener_parse_ex(tok, start, len);
706 if (!is_error(obj)) {
707 proto_shell_add_handler(name, obj);
708 json_object_put(obj);
709 json_tokener_free(tok);
710 tok = NULL;
711 } else if (start[len - 1] == '\n') {
712 json_tokener_free(tok);
713 tok = NULL;
714 }
715 } while (!feof(f) && !ferror(f));
716
717 if (tok)
718 json_tokener_free(tok);
719
720 pclose(f);
721 }
722
723 static void __init proto_shell_init(void)
724 {
725 glob_t g;
726 int main_fd;
727 int i;
728
729 main_fd = open(".", O_RDONLY | O_DIRECTORY);
730 if (main_fd < 0)
731 return;
732
733 if (chdir(main_path)) {
734 perror("chdir(main path)");
735 goto close_cur;
736 }
737
738 if (chdir("./proto"))
739 goto close_cur;
740
741 proto_fd.fd = open(".", O_RDONLY | O_DIRECTORY);
742 if (proto_fd.fd < 0)
743 goto close_cur;
744
745 netifd_fd_add(&proto_fd);
746 glob("./*.sh", 0, NULL, &g);
747 for (i = 0; i < g.gl_pathc; i++)
748 proto_shell_add_script(g.gl_pathv[i]);
749
750 close_cur:
751 fchdir(main_fd);
752 close(main_fd);
753 }
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