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         config = blobmsg_format_json(state->config, true);
 191         if (!config)
 192                 return -1;
 193
 194         argv[i++] = handler->script_name;
 195         argv[i++] = handler->proto.name;
 196         argv[i++] = action;
 197         argv[i++] = proto->iface->name;
 198         argv[i++] = config;
 199         if (proto->iface->main_dev.dev)
 200                 argv[i++] = proto->iface->main_dev.dev->ifname;
 201         argv[i] = NULL;
 202         envp[j] = NULL;
 203
 204         ret = netifd_start_process(argv, envp, proc);
 205         free(config);
 206
 207         return ret;
 208 }
 209
 210 static void
 211 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 212                      enum interface_event ev)
 213 {
 214         struct proto_shell_dependency *pdep;
 215
 216         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 217                 return;
 218
 219         pdep = container_of(dep, struct proto_shell_dependency, dep);
 220         proto_shell_update_host_dep(pdep);
 221 }
 222
 223 static void
 224 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 225                        enum interface_event ev)
 226 {
 227         struct proto_shell_dependency *pdep;
 228         struct proto_shell_state *state;
 229
 230         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 231                 return;
 232
 233         pdep = container_of(dep, struct proto_shell_dependency, dep);
 234         interface_remove_user(dep);
 235         dep->cb = proto_shell_if_up_cb;
 236         interface_add_user(dep, NULL);
 237
 238         state = pdep->proto;
 239         if (state->sm == S_IDLE) {
 240                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 241                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 242         }
 243 }
 244
 245 static void
 246 proto_shell_task_finish(struct proto_shell_state *state,
 247                         struct netifd_process *task)
 248 {
 249         switch (state->sm) {
 250         case S_IDLE:
 251                 if (task == &state->proto_task)
 252                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 253                 /* fall through */
 254         case S_SETUP:
 255                 if (task == &state->proto_task)
 256                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 257                                             false);
 258                 break;
 259
 260         case S_SETUP_ABORT:
 261                 if (state->script_task.uloop.pending ||
 262                     state->proto_task.uloop.pending)
 263                         break;
 264
 265                 uloop_timeout_cancel(&state->teardown_timeout);
 266                 state->sm = S_IDLE;
 267                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 268                 break;
 269
 270         case S_TEARDOWN:
 271                 if (state->script_task.uloop.pending)
 272                         break;
 273
 274                 if (state->proto_task.uloop.pending) {
 275                         if (!state->proto_task_killed)
 276                                 kill(state->proto_task.uloop.pid, SIGTERM);
 277                         break;
 278                 }
 279
 280                 uloop_timeout_cancel(&state->teardown_timeout);
 281                 state->sm = S_IDLE;
 282                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 283                 break;
 284         }
 285 }
 286
 287 static void
 288 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 289 {
 290         struct proto_shell_state *state;
 291
 292         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 293
 294         netifd_kill_process(&state->script_task);
 295         netifd_kill_process(&state->proto_task);
 296         proto_shell_task_finish(state, NULL);
 297 }
 298
 299 static void
 300 proto_shell_script_cb(struct netifd_process *p, int ret)
 301 {
 302         struct proto_shell_state *state;
 303
 304         state = container_of(p, struct proto_shell_state, script_task);
 305         proto_shell_task_finish(state, p);
 306 }
 307
 308 static void
 309 proto_shell_task_cb(struct netifd_process *p, int ret)
 310 {
 311         struct proto_shell_state *state;
 312
 313         state = container_of(p, struct proto_shell_state, proto_task);
 314
 315         if (state->sm == S_IDLE || state->sm == S_SETUP)
 316                 state->last_error = WEXITSTATUS(ret);
 317
 318         proto_shell_task_finish(state, p);
 319 }
 320
 321 static void
 322 proto_shell_free(struct interface_proto_state *proto)
 323 {
 324         struct proto_shell_state *state;
 325
 326         state = container_of(proto, struct proto_shell_state, proto);
 327         uloop_timeout_cancel(&state->teardown_timeout);
 328         proto_shell_clear_host_dep(state);
 329         netifd_kill_process(&state->script_task);
 330         netifd_kill_process(&state->proto_task);
 331         free(state->config);
 332         free(state);
 333 }
 334
 335 static void
 336 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 337                              bool v6)
 338 {
 339         struct blob_attr *cur;
 340         int rem;
 341
 342         blobmsg_for_each_attr(cur, attr, rem) {
 343                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 344                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 345                         continue;
 346                 }
 347
 348                 interface_ip_add_route(iface, cur, v6);
 349         }
 350 }
 351
 352 static void
 353 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 354 {
 355         struct blob_attr *cur;
 356         int rem;
 357
 358         blobmsg_for_each_attr(cur, attr, rem)
 359                 interface_add_data(iface, cur);
 360 }
 361
 362 static struct device *
 363 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 364 {
 365         struct device *dev;
 366         struct blob_buf b;
 367
 368         memset(&b, 0, sizeof(b));
 369         blob_buf_init(&b, 0);
 370         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 371         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 372         blob_buf_free(&b);
 373
 374         return dev;
 375 }
 376
 377 enum {
 378         NOTIFY_ACTION,
 379         NOTIFY_ERROR,
 380         NOTIFY_COMMAND,
 381         NOTIFY_ENV,
 382         NOTIFY_SIGNAL,
 383         NOTIFY_AVAILABLE,
 384         NOTIFY_LINK_UP,
 385         NOTIFY_IFNAME,
 386         NOTIFY_ADDR_EXT,
 387         NOTIFY_ROUTES,
 388         NOTIFY_ROUTES6,
 389         NOTIFY_TUNNEL,
 390         NOTIFY_DATA,
 391         NOTIFY_KEEP,
 392         NOTIFY_HOST,
 393         NOTIFY_DNS,
 394         NOTIFY_DNS_SEARCH,
 395         __NOTIFY_LAST
 396 };
 397
 398 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 399         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 400         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 401         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 402         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 403         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 404         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 405         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 406         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 407         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 408         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 409         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 410         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 411         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 412         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 413         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 414         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 415         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 416 };
 417
 418 static int
 419 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 420 {
 421         struct interface *iface = state->proto.iface;
 422         struct blob_attr *cur;
 423         struct device *dev;
 424         const char *devname;
 425         int dev_create = 1;
 426         bool addr_ext = false;
 427         bool keep = false;
 428         bool up;
 429
 430         if (!tb[NOTIFY_LINK_UP])
 431                 return UBUS_STATUS_INVALID_ARGUMENT;
 432
 433         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 434         if (!up) {
 435                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 436                 return 0;
 437         }
 438
 439         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 440                 keep = blobmsg_get_bool(cur);
 441
 442         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 443                 addr_ext = blobmsg_get_bool(cur);
 444                 if (addr_ext)
 445                         dev_create = 2;
 446         }
 447
 448         if (iface->state != IFS_UP)
 449                 keep = false;
 450
 451         dev = iface->main_dev.dev;
 452         if (tb[NOTIFY_IFNAME] && !keep) {
 453                 keep = false;
 454                 devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 455                 if (tb[NOTIFY_TUNNEL])
 456                         dev = proto_shell_create_tunnel(devname, tb[NOTIFY_TUNNEL]);
 457                 else
 458                         dev = device_get(devname, dev_create);
 459         }
 460
 461         if (!dev)
 462                 return UBUS_STATUS_INVALID_ARGUMENT;
 463
 464         interface_set_l3_dev(iface, dev);
 465         device_claim(&iface->l3_dev);
 466         device_set_present(dev, true);
 467
 468         if (!keep)
 469                 interface_update_start(iface);
 470
 471         proto_apply_ip_settings(iface, data, addr_ext);
 472
 473         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 474                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 475
 476         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 477                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 478
 479         if ((cur = tb[NOTIFY_DNS]))
 480                 interface_add_dns_server_list(&iface->proto_ip, cur);
 481
 482         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 483                 interface_add_dns_search_list(&iface->proto_ip, cur);
 484
 485         if ((cur = tb[NOTIFY_DATA]))
 486                 proto_shell_parse_data(state->proto.iface, cur);
 487
 488         interface_update_complete(state->proto.iface);
 489
 490         if (!keep)
 491                 state->proto.proto_event(&state->proto, IFPEV_UP);
 492         state->sm = S_IDLE;
 493
 494         return 0;
 495 }
 496
 497 static bool
 498 fill_string_list(struct blob_attr *attr, char **argv, int max)
 499 {
 500         struct blob_attr *cur;
 501         int argc = 0;
 502         int rem;
 503
 504         if (!attr)
 505                 goto out;
 506
 507         blobmsg_for_each_attr(cur, attr, rem) {
 508                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 509                         return false;
 510
 511                 if (!blobmsg_check_attr(cur, NULL))
 512                         return false;
 513
 514                 argv[argc++] = blobmsg_data(cur);
 515                 if (argc == max - 1)
 516                         return false;
 517         }
 518
 519 out:
 520         argv[argc] = NULL;
 521         return true;
 522 }
 523
 524 static int
 525 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 526 {
 527         static char *argv[64];
 528         static char *env[32];
 529
 530         if (!tb[NOTIFY_COMMAND])
 531                 goto error;
 532
 533         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 534                 goto error;
 535
 536         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 537                 goto error;
 538
 539         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 540
 541         return 0;
 542
 543 error:
 544         return UBUS_STATUS_INVALID_ARGUMENT;
 545 }
 546
 547 static int
 548 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 549 {
 550         unsigned int signal = ~0;
 551
 552         if (tb[NOTIFY_SIGNAL])
 553                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 554
 555         if (signal > 31)
 556                 signal = SIGTERM;
 557
 558         if (state->proto_task.uloop.pending) {
 559                 state->proto_task_killed = true;
 560                 kill(state->proto_task.uloop.pid, signal);
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int
 567 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 568 {
 569         struct blob_attr *cur;
 570         char *data[16];
 571         int n_data = 0;
 572         int rem;
 573
 574         if (!tb[NOTIFY_ERROR])
 575                 return UBUS_STATUS_INVALID_ARGUMENT;
 576
 577         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 578                 if (n_data + 1 == ARRAY_SIZE(data))
 579                         goto error;
 580
 581                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 582                         goto error;
 583
 584                 if (!blobmsg_check_attr(cur, NULL))
 585                         goto error;
 586
 587                 data[n_data++] = blobmsg_data(cur);
 588         }
 589
 590         if (!n_data)
 591                 goto error;
 592
 593         interface_add_error(state->proto.iface, state->handler->proto.name,
 594                         data[0], (const char **) &data[1], n_data - 1);
 595
 596         return 0;
 597
 598 error:
 599         return UBUS_STATUS_INVALID_ARGUMENT;
 600 }
 601
 602 static int
 603 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 604 {
 605         state->proto.iface->autostart = false;
 606         return 0;
 607 }
 608
 609 static int
 610 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 611 {
 612         if (!tb[NOTIFY_AVAILABLE])
 613                 return UBUS_STATUS_INVALID_ARGUMENT;
 614
 615         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 616         return 0;
 617 }
 618
 619 static int
 620 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 621 {
 622         struct proto_shell_dependency *dep;
 623         struct blob_attr *host = tb[NOTIFY_HOST];
 624         struct blob_attr *ifname_a = tb[NOTIFY_IFNAME];
 625         const char *ifname_str = ifname_a ? blobmsg_data(ifname_a) : "";
 626         char *ifname;
 627
 628         if (!host)
 629                 return UBUS_STATUS_INVALID_ARGUMENT;
 630
 631         dep = calloc_a(sizeof(*dep), &ifname, strlen(ifname_str) + 1);
 632         if (inet_pton(AF_INET, blobmsg_data(host), &dep->host) < 1) {
 633                 if (inet_pton(AF_INET6, blobmsg_data(host), &dep->host) < 1) {
 634                         free(dep);
 635                         return UBUS_STATUS_INVALID_ARGUMENT;
 636                 } else {
 637                         dep->v6 = true;
 638                 }
 639         }
 640
 641         dep->proto = state;
 642         dep->interface = strcpy(ifname, ifname_str);
 643
 644         dep->dep.cb = proto_shell_if_up_cb;
 645         interface_add_user(&dep->dep, NULL);
 646         list_add(&dep->list, &state->deps);
 647         proto_shell_update_host_dep(dep);
 648         if (!dep->dep.iface)
 649                 return UBUS_STATUS_NOT_FOUND;
 650
 651         return 0;
 652 }
 653
 654 static int
 655 proto_shell_setup_failed(struct proto_shell_state *state)
 656 {
 657         switch (state->sm) {
 658         case S_IDLE:
 659                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 660                 /* fall through */
 661         case S_SETUP:
 662                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 663                 break;
 664         default:
 665                 break;
 666         }
 667         return 0;
 668 }
 669
 670 static int
 671 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 672 {
 673         struct proto_shell_state *state;
 674         struct blob_attr *tb[__NOTIFY_LAST];
 675
 676         state = container_of(proto, struct proto_shell_state, proto);
 677
 678         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 679         if (!tb[NOTIFY_ACTION])
 680                 return UBUS_STATUS_INVALID_ARGUMENT;
 681
 682         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 683         case 0:
 684                 return proto_shell_update_link(state, attr, tb);
 685         case 1:
 686                 return proto_shell_run_command(state, tb);
 687         case 2:
 688                 return proto_shell_kill_command(state, tb);
 689         case 3:
 690                 return proto_shell_notify_error(state, tb);
 691         case 4:
 692                 return proto_shell_block_restart(state, tb);
 693         case 5:
 694                 return proto_shell_set_available(state, tb);
 695         case 6:
 696                 return proto_shell_add_host_dependency(state, tb);
 697         case 7:
 698                 return proto_shell_setup_failed(state);
 699         default:
 700                 return UBUS_STATUS_INVALID_ARGUMENT;
 701         }
 702 }
 703
 704 static struct interface_proto_state *
 705 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 706                    struct blob_attr *attr)
 707 {
 708         struct proto_shell_state *state;
 709
 710         state = calloc(1, sizeof(*state));
 711         INIT_LIST_HEAD(&state->deps);
 712
 713         state->config = malloc(blob_pad_len(attr));
 714         if (!state->config)
 715                 goto error;
 716
 717         memcpy(state->config, attr, blob_pad_len(attr));
 718         state->proto.free = proto_shell_free;
 719         state->proto.notify = proto_shell_notify;
 720         state->proto.cb = proto_shell_handler;
 721         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 722         state->script_task.cb = proto_shell_script_cb;
 723         state->script_task.dir_fd = proto_fd;
 724         state->script_task.log_prefix = iface->name;
 725         state->proto_task.cb = proto_shell_task_cb;
 726         state->proto_task.dir_fd = proto_fd;
 727         state->proto_task.log_prefix = iface->name;
 728         state->handler = container_of(h, struct proto_shell_handler, proto);
 729
 730         return &state->proto;
 731
 732 error:
 733         free(state);
 734         return NULL;
 735 }
 736
 737 static void
 738 proto_shell_add_handler(const char *script, const char *name, json_object *obj)
 739 {
 740         struct proto_shell_handler *handler;
 741         struct proto_handler *proto;
 742         json_object *config, *tmp;
 743         char *proto_name, *script_name;
 744
 745         handler = calloc_a(sizeof(*handler),
 746                            &proto_name, strlen(name) + 1,
 747                            &script_name, strlen(script) + 1);
 748         if (!handler)
 749                 return;
 750
 751         handler->script_name = strcpy(script_name, script);
 752
 753         proto = &handler->proto;
 754         proto->name = strcpy(proto_name, name);
 755         proto->config_params = &handler->config;
 756         proto->attach = proto_shell_attach;
 757
 758         tmp = json_get_field(obj, "no-device", json_type_boolean);
 759         if (tmp && json_object_get_boolean(tmp))
 760                 handler->proto.flags |= PROTO_FLAG_NODEV;
 761
 762         tmp = json_get_field(obj, "available", json_type_boolean);
 763         if (tmp && json_object_get_boolean(tmp))
 764                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 765
 766         tmp = json_get_field(obj, "renew-handler", json_type_boolean);
 767         if (tmp && json_object_get_boolean(tmp))
 768                 handler->proto.flags |= PROTO_FLAG_RENEW_AVAILABLE;
 769
 770         config = json_get_field(obj, "config", json_type_array);
 771         if (config)
 772                 handler->config_buf = netifd_handler_parse_config(&handler->config, config);
 773
 774         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 775         add_proto_handler(proto);
 776 }
 777
 778 void proto_shell_init(void)
 779 {
 780         proto_fd = netifd_open_subdir("proto");
 781         if (proto_fd < 0)
 782                 return;
 783
 784         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 785 }