proto-shell.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #define _GNU_SOURCE
  15
  16 #include <string.h>
  17 #include <stdlib.h>
  18 #include <stdio.h>
  19 #include <signal.h>
  20
  21 #include <arpa/inet.h>
  22 #include <netinet/in.h>
  23
  24
  25 #include "netifd.h"
  26 #include "interface.h"
  27 #include "interface-ip.h"
  28 #include "proto.h"
  29 #include "system.h"
  30 #include "handler.h"
  31
  32 static int proto_fd = -1;
  33
  34 enum proto_shell_sm {
  35         S_IDLE,
  36         S_SETUP,
  37         S_SETUP_ABORT,
  38         S_TEARDOWN,
  39 };
  40
  41 struct proto_shell_handler {
  42         struct list_head list;
  43         struct proto_handler proto;
  44         char *config_buf;
  45         char *script_name;
  46         bool init_available;
  47
  48         struct uci_blob_param_list config;
  49 };
  50
  51 struct proto_shell_dependency {
  52         struct list_head list;
  53
  54         char *interface;
  55         struct proto_shell_state *proto;
  56         struct interface_user dep;
  57
  58         union if_addr host;
  59         bool v6;
  60 };
  61
  62 struct proto_shell_state {
  63         struct interface_proto_state proto;
  64         struct proto_shell_handler *handler;
  65         struct blob_attr *config;
  66
  67         struct uloop_timeout teardown_timeout;
  68
  69         struct netifd_process script_task;
  70         struct netifd_process proto_task;
  71
  72         enum proto_shell_sm sm;
  73         bool proto_task_killed;
  74
  75         int last_error;
  76
  77         struct list_head deps;
  78 };
  79
  80 static void
  81 proto_shell_check_dependencies(struct proto_shell_state *state)
  82 {
  83         struct proto_shell_dependency *dep;
  84         bool available = true;
  85
  86         list_for_each_entry(dep, &state->deps, list) {
  87                 if (dep->dep.iface)
  88                         continue;
  89
  90                 available = false;
  91                 break;
  92         }
  93
  94         interface_set_available(state->proto.iface, available);
  95 }
  96
  97 static void
  98 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
  99                      enum interface_event ev);
 100 static void
 101 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 102                        enum interface_event ev);
 103
 104 static void
 105 proto_shell_update_host_dep(struct proto_shell_dependency *dep)
 106 {
 107         struct interface *iface = NULL;
 108
 109         if (dep->dep.iface)
 110                 goto out;
 111
 112         if (dep->interface[0])
 113                 iface = vlist_find(&interfaces, dep->interface, iface, node);
 114
 115         iface = interface_ip_add_target_route(&dep->host, dep->v6, iface);
 116         if (!iface)
 117                 goto out;
 118
 119         interface_remove_user(&dep->dep);
 120         dep->dep.cb = proto_shell_if_down_cb;
 121         interface_add_user(&dep->dep, iface);
 122
 123 out:
 124         proto_shell_check_dependencies(dep->proto);
 125 }
 126
 127 static void
 128 proto_shell_clear_host_dep(struct proto_shell_state *state)
 129 {
 130         struct proto_shell_dependency *dep, *tmp;
 131
 132         list_for_each_entry_safe(dep, tmp, &state->deps, list) {
 133                 interface_remove_user(&dep->dep);
 134                 list_del(&dep->list);
 135                 free(dep);
 136         }
 137 }
 138
 139 static int
 140 proto_shell_handler(struct interface_proto_state *proto,
 141                     enum interface_proto_cmd cmd, bool force)
 142 {
 143         struct proto_shell_state *state;
 144         struct proto_shell_handler *handler;
 145         struct netifd_process *proc;
 146         static char error_buf[32];
 147         const char *argv[7];
 148         char *envp[2];
 149         const char *action;
 150         char *config;
 151         int ret, i = 0, j = 0;
 152
 153         state = container_of(proto, struct proto_shell_state, proto);
 154         handler = state->handler;
 155         proc = &state->script_task;
 156
 157         if (cmd == PROTO_CMD_SETUP) {
 158                 action = "setup";
 159                 state->last_error = -1;
 160                 proto_shell_clear_host_dep(state);
 161                 state->sm = S_SETUP;
 162         } else if (cmd == PROTO_CMD_RENEW) {
 163                 if (!(handler->proto.flags & PROTO_FLAG_RENEW_AVAILABLE))
 164                         return 0;
 165                 action = "renew";
 166         } else {
 167                 if (state->sm == S_TEARDOWN)
 168                         return 0;
 169
 170                 if (state->script_task.uloop.pending) {
 171                         if (state->sm != S_SETUP_ABORT) {
 172                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 173                                 kill(state->script_task.uloop.pid, SIGTERM);
 174                                 if (state->proto_task.uloop.pending)
 175                                         kill(state->proto_task.uloop.pid, SIGTERM);
 176                                 state->sm = S_SETUP_ABORT;
 177                         }
 178                         return 0;
 179                 }
 180
 181                 action = "teardown";
 182                 state->sm = S_TEARDOWN;
 183                 if (state->last_error >= 0) {
 184                         snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 185                         envp[j++] = error_buf;
 186                 }
 187                 uloop_timeout_set(&state->teardown_timeout, 5000);
 188         }
 189
 190         D(INTERFACE, "run %s for interface '%s'\n", action, proto->iface->name);
 191         config = blobmsg_format_json(state->config, true);
 192         if (!config)
 193                 return -1;
 194
 195         argv[i++] = handler->script_name;
 196         argv[i++] = handler->proto.name;
 197         argv[i++] = action;
 198         argv[i++] = proto->iface->name;
 199         argv[i++] = config;
 200         if (proto->iface->main_dev.dev)
 201                 argv[i++] = proto->iface->main_dev.dev->ifname;
 202         argv[i] = NULL;
 203         envp[j] = NULL;
 204
 205         ret = netifd_start_process(argv, envp, proc);
 206         free(config);
 207
 208         return ret;
 209 }
 210
 211 static void
 212 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 213                      enum interface_event ev)
 214 {
 215         struct proto_shell_dependency *pdep;
 216
 217         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 218                 return;
 219
 220         pdep = container_of(dep, struct proto_shell_dependency, dep);
 221         proto_shell_update_host_dep(pdep);
 222 }
 223
 224 static void
 225 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 226                        enum interface_event ev)
 227 {
 228         struct proto_shell_dependency *pdep;
 229         struct proto_shell_state *state;
 230
 231         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 232                 return;
 233
 234         pdep = container_of(dep, struct proto_shell_dependency, dep);
 235         interface_remove_user(dep);
 236         dep->cb = proto_shell_if_up_cb;
 237         interface_add_user(dep, NULL);
 238
 239         state = pdep->proto;
 240         if (state->sm == S_IDLE) {
 241                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 242                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 243         }
 244 }
 245
 246 static void
 247 proto_shell_task_finish(struct proto_shell_state *state,
 248                         struct netifd_process *task)
 249 {
 250         switch (state->sm) {
 251         case S_IDLE:
 252                 if (task == &state->proto_task)
 253                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 254                 /* fall through */
 255         case S_SETUP:
 256                 if (task == &state->proto_task)
 257                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 258                                             false);
 259                 break;
 260
 261         case S_SETUP_ABORT:
 262                 if (state->script_task.uloop.pending ||
 263                     state->proto_task.uloop.pending)
 264                         break;
 265
 266                 uloop_timeout_cancel(&state->teardown_timeout);
 267                 state->sm = S_IDLE;
 268                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 269                 break;
 270
 271         case S_TEARDOWN:
 272                 if (state->script_task.uloop.pending)
 273                         break;
 274
 275                 if (state->proto_task.uloop.pending) {
 276                         if (!state->proto_task_killed)
 277                                 kill(state->proto_task.uloop.pid, SIGTERM);
 278                         break;
 279                 }
 280
 281                 uloop_timeout_cancel(&state->teardown_timeout);
 282                 state->sm = S_IDLE;
 283                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 284                 break;
 285         }
 286 }
 287
 288 static void
 289 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 290 {
 291         struct proto_shell_state *state;
 292
 293         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 294
 295         netifd_kill_process(&state->script_task);
 296         netifd_kill_process(&state->proto_task);
 297         proto_shell_task_finish(state, NULL);
 298 }
 299
 300 static void
 301 proto_shell_script_cb(struct netifd_process *p, int ret)
 302 {
 303         struct proto_shell_state *state;
 304
 305         state = container_of(p, struct proto_shell_state, script_task);
 306         proto_shell_task_finish(state, p);
 307 }
 308
 309 static void
 310 proto_shell_task_cb(struct netifd_process *p, int ret)
 311 {
 312         struct proto_shell_state *state;
 313
 314         state = container_of(p, struct proto_shell_state, proto_task);
 315
 316         if (state->sm == S_IDLE || state->sm == S_SETUP)
 317                 state->last_error = WEXITSTATUS(ret);
 318
 319         proto_shell_task_finish(state, p);
 320 }
 321
 322 static void
 323 proto_shell_free(struct interface_proto_state *proto)
 324 {
 325         struct proto_shell_state *state;
 326
 327         state = container_of(proto, struct proto_shell_state, proto);
 328         uloop_timeout_cancel(&state->teardown_timeout);
 329         proto_shell_clear_host_dep(state);
 330         netifd_kill_process(&state->script_task);
 331         netifd_kill_process(&state->proto_task);
 332         free(state->config);
 333         free(state);
 334 }
 335
 336 static void
 337 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 338                              bool v6)
 339 {
 340         struct blob_attr *cur;
 341         int rem;
 342
 343         blobmsg_for_each_attr(cur, attr, rem) {
 344                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 345                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 346                         continue;
 347                 }
 348
 349                 interface_ip_add_route(iface, cur, v6);
 350         }
 351 }
 352
 353 static void
 354 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 355 {
 356         struct blob_attr *cur;
 357         int rem;
 358
 359         blobmsg_for_each_attr(cur, attr, rem)
 360                 interface_add_data(iface, cur);
 361 }
 362
 363 static struct device *
 364 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 365 {
 366         struct device *dev;
 367         struct blob_buf b;
 368
 369         memset(&b, 0, sizeof(b));
 370         blob_buf_init(&b, 0);
 371         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 372         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 373         blob_buf_free(&b);
 374
 375         return dev;
 376 }
 377
 378 enum {
 379         NOTIFY_ACTION,
 380         NOTIFY_ERROR,
 381         NOTIFY_COMMAND,
 382         NOTIFY_ENV,
 383         NOTIFY_SIGNAL,
 384         NOTIFY_AVAILABLE,
 385         NOTIFY_LINK_UP,
 386         NOTIFY_IFNAME,
 387         NOTIFY_ADDR_EXT,
 388         NOTIFY_ROUTES,
 389         NOTIFY_ROUTES6,
 390         NOTIFY_TUNNEL,
 391         NOTIFY_DATA,
 392         NOTIFY_KEEP,
 393         NOTIFY_HOST,
 394         NOTIFY_DNS,
 395         NOTIFY_DNS_SEARCH,
 396         __NOTIFY_LAST
 397 };
 398
 399 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 400         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 401         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 402         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 403         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 404         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 405         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 406         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 407         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 408         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 409         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 410         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 411         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 412         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 413         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 414         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 415         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 416         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 417 };
 418
 419 static int
 420 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 421 {
 422         struct interface *iface = state->proto.iface;
 423         struct blob_attr *cur;
 424         struct device *dev;
 425         const char *devname;
 426         int dev_create = 1;
 427         bool addr_ext = false;
 428         bool keep = false;
 429         bool up;
 430
 431         if (!tb[NOTIFY_LINK_UP])
 432                 return UBUS_STATUS_INVALID_ARGUMENT;
 433
 434         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 435         if (!up) {
 436                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 437                 return 0;
 438         }
 439
 440         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 441                 keep = blobmsg_get_bool(cur);
 442
 443         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 444                 addr_ext = blobmsg_get_bool(cur);
 445                 if (addr_ext)
 446                         dev_create = 2;
 447         }
 448
 449         if (iface->state != IFS_UP || !iface->l3_dev.dev)
 450                 keep = false;
 451
 452         if (!keep) {
 453                 dev = iface->main_dev.dev;
 454                 if (tb[NOTIFY_IFNAME]) {
 455                         keep = false;
 456                         devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 457                         if (tb[NOTIFY_TUNNEL])
 458                                 dev = proto_shell_create_tunnel(devname, tb[NOTIFY_TUNNEL]);
 459                         else
 460                                 dev = device_get(devname, dev_create);
 461                 }
 462
 463                 if (!dev)
 464                         return UBUS_STATUS_INVALID_ARGUMENT;
 465
 466                 interface_set_l3_dev(iface, dev);
 467                 if (device_claim(&iface->l3_dev) < 0)
 468                         return UBUS_STATUS_UNKNOWN_ERROR;
 469
 470                 device_set_present(dev, true);
 471
 472                 interface_update_start(iface);
 473         }
 474
 475         proto_apply_ip_settings(iface, data, addr_ext);
 476
 477         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 478                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 479
 480         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 481                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 482
 483         if ((cur = tb[NOTIFY_DNS]))
 484                 interface_add_dns_server_list(&iface->proto_ip, cur);
 485
 486         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 487                 interface_add_dns_search_list(&iface->proto_ip, cur);
 488
 489         if ((cur = tb[NOTIFY_DATA]))
 490                 proto_shell_parse_data(state->proto.iface, cur);
 491
 492         interface_update_complete(state->proto.iface);
 493
 494         if (!keep)
 495                 state->proto.proto_event(&state->proto, IFPEV_UP);
 496         state->sm = S_IDLE;
 497
 498         return 0;
 499 }
 500
 501 static bool
 502 fill_string_list(struct blob_attr *attr, char **argv, int max)
 503 {
 504         struct blob_attr *cur;
 505         int argc = 0;
 506         int rem;
 507
 508         if (!attr)
 509                 goto out;
 510
 511         blobmsg_for_each_attr(cur, attr, rem) {
 512                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 513                         return false;
 514
 515                 if (!blobmsg_check_attr(cur, NULL))
 516                         return false;
 517
 518                 argv[argc++] = blobmsg_data(cur);
 519                 if (argc == max - 1)
 520                         return false;
 521         }
 522
 523 out:
 524         argv[argc] = NULL;
 525         return true;
 526 }
 527
 528 static int
 529 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 530 {
 531         static char *argv[64];
 532         static char *env[32];
 533
 534         if (!tb[NOTIFY_COMMAND])
 535                 goto error;
 536
 537         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 538                 goto error;
 539
 540         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 541                 goto error;
 542
 543         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 544
 545         return 0;
 546
 547 error:
 548         return UBUS_STATUS_INVALID_ARGUMENT;
 549 }
 550
 551 static int
 552 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 553 {
 554         unsigned int signal = ~0;
 555
 556         if (tb[NOTIFY_SIGNAL])
 557                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 558
 559         if (signal > 31)
 560                 signal = SIGTERM;
 561
 562         if (state->proto_task.uloop.pending) {
 563                 state->proto_task_killed = true;
 564                 kill(state->proto_task.uloop.pid, signal);
 565         }
 566
 567         return 0;
 568 }
 569
 570 static int
 571 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 572 {
 573         struct blob_attr *cur;
 574         char *data[16];
 575         int n_data = 0;
 576         int rem;
 577
 578         if (!tb[NOTIFY_ERROR])
 579                 return UBUS_STATUS_INVALID_ARGUMENT;
 580
 581         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 582                 if (n_data + 1 == ARRAY_SIZE(data))
 583                         goto error;
 584
 585                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 586                         goto error;
 587
 588                 if (!blobmsg_check_attr(cur, NULL))
 589                         goto error;
 590
 591                 data[n_data++] = blobmsg_data(cur);
 592         }
 593
 594         if (!n_data)
 595                 goto error;
 596
 597         interface_add_error(state->proto.iface, state->handler->proto.name,
 598                         data[0], (const char **) &data[1], n_data - 1);
 599
 600         return 0;
 601
 602 error:
 603         return UBUS_STATUS_INVALID_ARGUMENT;
 604 }
 605
 606 static int
 607 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 608 {
 609         state->proto.iface->autostart = false;
 610         return 0;
 611 }
 612
 613 static int
 614 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 615 {
 616         if (!tb[NOTIFY_AVAILABLE])
 617                 return UBUS_STATUS_INVALID_ARGUMENT;
 618
 619         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 620         return 0;
 621 }
 622
 623 static int
 624 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 625 {
 626         struct proto_shell_dependency *dep;
 627         struct blob_attr *host = tb[NOTIFY_HOST];
 628         struct blob_attr *ifname_a = tb[NOTIFY_IFNAME];
 629         const char *ifname_str = ifname_a ? blobmsg_data(ifname_a) : "";
 630         char *ifname;
 631
 632         if (!host)
 633                 return UBUS_STATUS_INVALID_ARGUMENT;
 634
 635         dep = calloc_a(sizeof(*dep), &ifname, strlen(ifname_str) + 1);
 636         if (inet_pton(AF_INET, blobmsg_data(host), &dep->host) < 1) {
 637                 if (inet_pton(AF_INET6, blobmsg_data(host), &dep->host) < 1) {
 638                         free(dep);
 639                         return UBUS_STATUS_INVALID_ARGUMENT;
 640                 } else {
 641                         dep->v6 = true;
 642                 }
 643         }
 644
 645         dep->proto = state;
 646         dep->interface = strcpy(ifname, ifname_str);
 647
 648         dep->dep.cb = proto_shell_if_up_cb;
 649         interface_add_user(&dep->dep, NULL);
 650         list_add(&dep->list, &state->deps);
 651         proto_shell_update_host_dep(dep);
 652         if (!dep->dep.iface)
 653                 return UBUS_STATUS_NOT_FOUND;
 654
 655         return 0;
 656 }
 657
 658 static int
 659 proto_shell_setup_failed(struct proto_shell_state *state)
 660 {
 661         switch (state->sm) {
 662         case S_IDLE:
 663                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 664                 /* fall through */
 665         case S_SETUP:
 666                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 667                 break;
 668         default:
 669                 break;
 670         }
 671         return 0;
 672 }
 673
 674 static int
 675 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 676 {
 677         struct proto_shell_state *state;
 678         struct blob_attr *tb[__NOTIFY_LAST];
 679
 680         state = container_of(proto, struct proto_shell_state, proto);
 681
 682         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 683         if (!tb[NOTIFY_ACTION])
 684                 return UBUS_STATUS_INVALID_ARGUMENT;
 685
 686         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 687         case 0:
 688                 return proto_shell_update_link(state, attr, tb);
 689         case 1:
 690                 return proto_shell_run_command(state, tb);
 691         case 2:
 692                 return proto_shell_kill_command(state, tb);
 693         case 3:
 694                 return proto_shell_notify_error(state, tb);
 695         case 4:
 696                 return proto_shell_block_restart(state, tb);
 697         case 5:
 698                 return proto_shell_set_available(state, tb);
 699         case 6:
 700                 return proto_shell_add_host_dependency(state, tb);
 701         case 7:
 702                 return proto_shell_setup_failed(state);
 703         default:
 704                 return UBUS_STATUS_INVALID_ARGUMENT;
 705         }
 706 }
 707
 708 static struct interface_proto_state *
 709 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 710                    struct blob_attr *attr)
 711 {
 712         struct proto_shell_state *state;
 713
 714         state = calloc(1, sizeof(*state));
 715         INIT_LIST_HEAD(&state->deps);
 716
 717         state->config = malloc(blob_pad_len(attr));
 718         if (!state->config)
 719                 goto error;
 720
 721         memcpy(state->config, attr, blob_pad_len(attr));
 722         state->proto.free = proto_shell_free;
 723         state->proto.notify = proto_shell_notify;
 724         state->proto.cb = proto_shell_handler;
 725         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 726         state->script_task.cb = proto_shell_script_cb;
 727         state->script_task.dir_fd = proto_fd;
 728         state->script_task.log_prefix = iface->name;
 729         state->proto_task.cb = proto_shell_task_cb;
 730         state->proto_task.dir_fd = proto_fd;
 731         state->proto_task.log_prefix = iface->name;
 732         state->handler = container_of(h, struct proto_shell_handler, proto);
 733
 734         return &state->proto;
 735
 736 error:
 737         free(state);
 738         return NULL;
 739 }
 740
 741 static void
 742 proto_shell_add_handler(const char *script, const char *name, json_object *obj)
 743 {
 744         struct proto_shell_handler *handler;
 745         struct proto_handler *proto;
 746         json_object *config, *tmp;
 747         char *proto_name, *script_name;
 748
 749         handler = calloc_a(sizeof(*handler),
 750                            &proto_name, strlen(name) + 1,
 751                            &script_name, strlen(script) + 1);
 752         if (!handler)
 753                 return;
 754
 755         handler->script_name = strcpy(script_name, script);
 756
 757         proto = &handler->proto;
 758         proto->name = strcpy(proto_name, name);
 759         proto->config_params = &handler->config;
 760         proto->attach = proto_shell_attach;
 761
 762         tmp = json_get_field(obj, "no-device", json_type_boolean);
 763         if (tmp && json_object_get_boolean(tmp))
 764                 handler->proto.flags |= PROTO_FLAG_NODEV;
 765
 766         tmp = json_get_field(obj, "available", json_type_boolean);
 767         if (tmp && json_object_get_boolean(tmp))
 768                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 769
 770         tmp = json_get_field(obj, "renew-handler", json_type_boolean);
 771         if (tmp && json_object_get_boolean(tmp))
 772                 handler->proto.flags |= PROTO_FLAG_RENEW_AVAILABLE;
 773
 774         config = json_get_field(obj, "config", json_type_array);
 775         if (config)
 776                 handler->config_buf = netifd_handler_parse_config(&handler->config, config);
 777
 778         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 779         add_proto_handler(proto);
 780 }
 781
 782 void proto_shell_init(void)
 783 {
 784         proto_fd = netifd_open_subdir("proto");
 785         if (proto_fd < 0)
 786                 return;
 787
 788         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 789 }