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         bool renew_pending;
  75
  76         int last_error;
  77
  78         struct list_head deps;
  79 };
  80
  81 static void
  82 proto_shell_check_dependencies(struct proto_shell_state *state)
  83 {
  84         struct proto_shell_dependency *dep;
  85         bool available = true;
  86
  87         list_for_each_entry(dep, &state->deps, list) {
  88                 if (dep->dep.iface)
  89                         continue;
  90
  91                 available = false;
  92                 break;
  93         }
  94
  95         interface_set_available(state->proto.iface, available);
  96 }
  97
  98 static void
  99 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 100                      enum interface_event ev);
 101 static void
 102 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 103                        enum interface_event ev);
 104
 105 static void
 106 proto_shell_update_host_dep(struct proto_shell_dependency *dep)
 107 {
 108         struct interface *iface = NULL;
 109
 110         if (dep->dep.iface)
 111                 goto out;
 112
 113         if (dep->interface[0])
 114                 iface = vlist_find(&interfaces, dep->interface, iface, node);
 115
 116         iface = interface_ip_add_target_route(&dep->host, dep->v6, iface);
 117         if (!iface)
 118                 goto out;
 119
 120         interface_remove_user(&dep->dep);
 121         dep->dep.cb = proto_shell_if_down_cb;
 122         interface_add_user(&dep->dep, iface);
 123
 124 out:
 125         proto_shell_check_dependencies(dep->proto);
 126 }
 127
 128 static void
 129 proto_shell_clear_host_dep(struct proto_shell_state *state)
 130 {
 131         struct proto_shell_dependency *dep, *tmp;
 132
 133         list_for_each_entry_safe(dep, tmp, &state->deps, list) {
 134                 interface_remove_user(&dep->dep);
 135                 list_del(&dep->list);
 136                 free(dep);
 137         }
 138 }
 139
 140 static int
 141 proto_shell_handler(struct interface_proto_state *proto,
 142                     enum interface_proto_cmd cmd, bool force)
 143 {
 144         struct proto_shell_state *state;
 145         struct proto_shell_handler *handler;
 146         struct netifd_process *proc;
 147         static char error_buf[32];
 148         const char *argv[7];
 149         char *envp[2];
 150         const char *action;
 151         char *config;
 152         int ret, i = 0, j = 0;
 153
 154         state = container_of(proto, struct proto_shell_state, proto);
 155         handler = state->handler;
 156         proc = &state->script_task;
 157
 158         if (cmd == PROTO_CMD_SETUP) {
 159                 action = "setup";
 160                 state->last_error = -1;
 161                 proto_shell_clear_host_dep(state);
 162                 state->sm = S_SETUP;
 163         } else if (cmd == PROTO_CMD_RENEW) {
 164                 if (!(handler->proto.flags & PROTO_FLAG_RENEW_AVAILABLE))
 165                         return 0;
 166
 167                 if (state->script_task.uloop.pending) {
 168                         state->renew_pending = true;
 169                         return 0;
 170                 }
 171
 172                 state->renew_pending = false;
 173                 action = "renew";
 174         } else {
 175                 if (state->sm == S_TEARDOWN)
 176                         return 0;
 177
 178                 state->renew_pending = false;
 179                 if (state->script_task.uloop.pending) {
 180                         if (state->sm != S_SETUP_ABORT) {
 181                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 182                                 kill(state->script_task.uloop.pid, SIGTERM);
 183                                 if (state->proto_task.uloop.pending)
 184                                         kill(state->proto_task.uloop.pid, SIGTERM);
 185                                 state->sm = S_SETUP_ABORT;
 186                         }
 187                         return 0;
 188                 }
 189
 190                 action = "teardown";
 191                 state->sm = S_TEARDOWN;
 192                 if (state->last_error >= 0) {
 193                         snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 194                         envp[j++] = error_buf;
 195                 }
 196                 uloop_timeout_set(&state->teardown_timeout, 5000);
 197         }
 198
 199         D(INTERFACE, "run %s for interface '%s'\n", action, proto->iface->name);
 200         config = blobmsg_format_json(state->config, true);
 201         if (!config)
 202                 return -1;
 203
 204         argv[i++] = handler->script_name;
 205         argv[i++] = handler->proto.name;
 206         argv[i++] = action;
 207         argv[i++] = proto->iface->name;
 208         argv[i++] = config;
 209         if (proto->iface->main_dev.dev)
 210                 argv[i++] = proto->iface->main_dev.dev->ifname;
 211         argv[i] = NULL;
 212         envp[j] = NULL;
 213
 214         ret = netifd_start_process(argv, envp, proc);
 215         free(config);
 216
 217         return ret;
 218 }
 219
 220 static void
 221 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 222                      enum interface_event ev)
 223 {
 224         struct proto_shell_dependency *pdep;
 225
 226         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 227                 return;
 228
 229         pdep = container_of(dep, struct proto_shell_dependency, dep);
 230         proto_shell_update_host_dep(pdep);
 231 }
 232
 233 static void
 234 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 235                        enum interface_event ev)
 236 {
 237         struct proto_shell_dependency *pdep;
 238         struct proto_shell_state *state;
 239
 240         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 241                 return;
 242
 243         pdep = container_of(dep, struct proto_shell_dependency, dep);
 244         interface_remove_user(dep);
 245         dep->cb = proto_shell_if_up_cb;
 246         interface_add_user(dep, NULL);
 247
 248         state = pdep->proto;
 249         if (state->sm == S_IDLE) {
 250                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 251                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 252         }
 253 }
 254
 255 static void
 256 proto_shell_task_finish(struct proto_shell_state *state,
 257                         struct netifd_process *task)
 258 {
 259         switch (state->sm) {
 260         case S_IDLE:
 261                 if (task == &state->proto_task)
 262                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 263                 /* fall through */
 264         case S_SETUP:
 265                 if (task == &state->proto_task)
 266                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 267                                             false);
 268                 if (task == &state->script_task && state->renew_pending)
 269                         proto_shell_handler(&state->proto, PROTO_CMD_RENEW,
 270                                             false);
 271                 break;
 272
 273         case S_SETUP_ABORT:
 274                 if (state->script_task.uloop.pending ||
 275                     state->proto_task.uloop.pending)
 276                         break;
 277
 278                 uloop_timeout_cancel(&state->teardown_timeout);
 279                 state->sm = S_IDLE;
 280                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 281                 break;
 282
 283         case S_TEARDOWN:
 284                 if (state->script_task.uloop.pending)
 285                         break;
 286
 287                 if (state->proto_task.uloop.pending) {
 288                         if (!state->proto_task_killed)
 289                                 kill(state->proto_task.uloop.pid, SIGTERM);
 290                         break;
 291                 }
 292
 293                 uloop_timeout_cancel(&state->teardown_timeout);
 294                 state->sm = S_IDLE;
 295                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 296                 break;
 297         }
 298 }
 299
 300 static void
 301 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 302 {
 303         struct proto_shell_state *state;
 304
 305         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 306
 307         netifd_kill_process(&state->script_task);
 308         netifd_kill_process(&state->proto_task);
 309         proto_shell_task_finish(state, NULL);
 310 }
 311
 312 static void
 313 proto_shell_script_cb(struct netifd_process *p, int ret)
 314 {
 315         struct proto_shell_state *state;
 316
 317         state = container_of(p, struct proto_shell_state, script_task);
 318         proto_shell_task_finish(state, p);
 319 }
 320
 321 static void
 322 proto_shell_task_cb(struct netifd_process *p, int ret)
 323 {
 324         struct proto_shell_state *state;
 325
 326         state = container_of(p, struct proto_shell_state, proto_task);
 327
 328         if (state->sm == S_IDLE || state->sm == S_SETUP)
 329                 state->last_error = WEXITSTATUS(ret);
 330
 331         proto_shell_task_finish(state, p);
 332 }
 333
 334 static void
 335 proto_shell_free(struct interface_proto_state *proto)
 336 {
 337         struct proto_shell_state *state;
 338
 339         state = container_of(proto, struct proto_shell_state, proto);
 340         uloop_timeout_cancel(&state->teardown_timeout);
 341         proto_shell_clear_host_dep(state);
 342         netifd_kill_process(&state->script_task);
 343         netifd_kill_process(&state->proto_task);
 344         free(state->config);
 345         free(state);
 346 }
 347
 348 static void
 349 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 350                              bool v6)
 351 {
 352         struct blob_attr *cur;
 353         int rem;
 354
 355         blobmsg_for_each_attr(cur, attr, rem) {
 356                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 357                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 358                         continue;
 359                 }
 360
 361                 interface_ip_add_route(iface, cur, v6);
 362         }
 363 }
 364
 365 static void
 366 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 367 {
 368         struct blob_attr *cur;
 369         int rem;
 370
 371         blobmsg_for_each_attr(cur, attr, rem)
 372                 interface_add_data(iface, cur);
 373 }
 374
 375 static struct device *
 376 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 377 {
 378         struct device *dev;
 379         struct blob_buf b;
 380
 381         memset(&b, 0, sizeof(b));
 382         blob_buf_init(&b, 0);
 383         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 384         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 385         blob_buf_free(&b);
 386
 387         return dev;
 388 }
 389
 390 enum {
 391         NOTIFY_ACTION,
 392         NOTIFY_ERROR,
 393         NOTIFY_COMMAND,
 394         NOTIFY_ENV,
 395         NOTIFY_SIGNAL,
 396         NOTIFY_AVAILABLE,
 397         NOTIFY_LINK_UP,
 398         NOTIFY_IFNAME,
 399         NOTIFY_ADDR_EXT,
 400         NOTIFY_ROUTES,
 401         NOTIFY_ROUTES6,
 402         NOTIFY_TUNNEL,
 403         NOTIFY_DATA,
 404         NOTIFY_KEEP,
 405         NOTIFY_HOST,
 406         NOTIFY_DNS,
 407         NOTIFY_DNS_SEARCH,
 408         __NOTIFY_LAST
 409 };
 410
 411 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 412         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 413         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 414         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 415         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 416         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 417         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 418         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 419         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 420         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 421         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 422         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 423         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 424         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 425         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 426         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 427         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 428         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 429 };
 430
 431 static int
 432 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 433 {
 434         struct interface *iface = state->proto.iface;
 435         struct blob_attr *cur;
 436         struct device *dev;
 437         const char *devname;
 438         int dev_create = 1;
 439         bool addr_ext = false;
 440         bool keep = false;
 441         bool up;
 442
 443         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 444                 return UBUS_STATUS_PERMISSION_DENIED;
 445
 446         if (!tb[NOTIFY_LINK_UP])
 447                 return UBUS_STATUS_INVALID_ARGUMENT;
 448
 449         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 450         if (!up) {
 451                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 452                 return 0;
 453         }
 454
 455         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 456                 keep = blobmsg_get_bool(cur);
 457
 458         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 459                 addr_ext = blobmsg_get_bool(cur);
 460                 if (addr_ext)
 461                         dev_create = 2;
 462         }
 463
 464         if (iface->state != IFS_UP || !iface->l3_dev.dev)
 465                 keep = false;
 466
 467         if (!keep) {
 468                 dev = iface->main_dev.dev;
 469                 if (tb[NOTIFY_IFNAME]) {
 470                         keep = false;
 471                         devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 472                         if (tb[NOTIFY_TUNNEL])
 473                                 dev = proto_shell_create_tunnel(devname, tb[NOTIFY_TUNNEL]);
 474                         else
 475                                 dev = device_get(devname, dev_create);
 476                 }
 477
 478                 if (!dev)
 479                         return UBUS_STATUS_INVALID_ARGUMENT;
 480
 481                 interface_set_l3_dev(iface, dev);
 482                 if (device_claim(&iface->l3_dev) < 0)
 483                         return UBUS_STATUS_UNKNOWN_ERROR;
 484
 485                 device_set_present(dev, true);
 486
 487                 interface_update_start(iface);
 488         }
 489
 490         proto_apply_ip_settings(iface, data, addr_ext);
 491
 492         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 493                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 494
 495         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 496                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 497
 498         if ((cur = tb[NOTIFY_DNS]))
 499                 interface_add_dns_server_list(&iface->proto_ip, cur);
 500
 501         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 502                 interface_add_dns_search_list(&iface->proto_ip, cur);
 503
 504         if ((cur = tb[NOTIFY_DATA]))
 505                 proto_shell_parse_data(state->proto.iface, cur);
 506
 507         interface_update_complete(state->proto.iface);
 508
 509         if ((state->sm != S_SETUP_ABORT) && (state->sm != S_TEARDOWN)) {
 510                 if (!keep)
 511                         state->proto.proto_event(&state->proto, IFPEV_UP);
 512                 state->sm = S_IDLE;
 513         }
 514
 515         return 0;
 516 }
 517
 518 static bool
 519 fill_string_list(struct blob_attr *attr, char **argv, int max)
 520 {
 521         struct blob_attr *cur;
 522         int argc = 0;
 523         int rem;
 524
 525         if (!attr)
 526                 goto out;
 527
 528         blobmsg_for_each_attr(cur, attr, rem) {
 529                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 530                         return false;
 531
 532                 if (!blobmsg_check_attr(cur, NULL))
 533                         return false;
 534
 535                 argv[argc++] = blobmsg_data(cur);
 536                 if (argc == max - 1)
 537                         return false;
 538         }
 539
 540 out:
 541         argv[argc] = NULL;
 542         return true;
 543 }
 544
 545 static int
 546 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 547 {
 548         static char *argv[64];
 549         static char *env[32];
 550
 551         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 552                 return UBUS_STATUS_PERMISSION_DENIED;
 553
 554         if (!tb[NOTIFY_COMMAND])
 555                 goto error;
 556
 557         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 558                 goto error;
 559
 560         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 561                 goto error;
 562
 563         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 564
 565         return 0;
 566
 567 error:
 568         return UBUS_STATUS_INVALID_ARGUMENT;
 569 }
 570
 571 static int
 572 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 573 {
 574         unsigned int signal = ~0;
 575
 576         if (tb[NOTIFY_SIGNAL])
 577                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 578
 579         if (signal > 31)
 580                 signal = SIGTERM;
 581
 582         if (state->proto_task.uloop.pending) {
 583                 if (signal == SIGTERM || signal == SIGKILL)
 584                         state->proto_task_killed = true;
 585                 kill(state->proto_task.uloop.pid, signal);
 586         }
 587
 588         return 0;
 589 }
 590
 591 static int
 592 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 593 {
 594         struct blob_attr *cur;
 595         char *data[16];
 596         int n_data = 0;
 597         int rem;
 598
 599         if (!tb[NOTIFY_ERROR])
 600                 return UBUS_STATUS_INVALID_ARGUMENT;
 601
 602         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 603                 if (n_data + 1 == ARRAY_SIZE(data))
 604                         goto error;
 605
 606                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 607                         goto error;
 608
 609                 if (!blobmsg_check_attr(cur, NULL))
 610                         goto error;
 611
 612                 data[n_data++] = blobmsg_data(cur);
 613         }
 614
 615         if (!n_data)
 616                 goto error;
 617
 618         interface_add_error(state->proto.iface, state->handler->proto.name,
 619                         data[0], (const char **) &data[1], n_data - 1);
 620
 621         return 0;
 622
 623 error:
 624         return UBUS_STATUS_INVALID_ARGUMENT;
 625 }
 626
 627 static int
 628 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 629 {
 630         state->proto.iface->autostart = false;
 631         return 0;
 632 }
 633
 634 static int
 635 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 636 {
 637         if (!tb[NOTIFY_AVAILABLE])
 638                 return UBUS_STATUS_INVALID_ARGUMENT;
 639
 640         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 641         return 0;
 642 }
 643
 644 static int
 645 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 646 {
 647         struct proto_shell_dependency *dep;
 648         struct blob_attr *host = tb[NOTIFY_HOST];
 649         struct blob_attr *ifname_a = tb[NOTIFY_IFNAME];
 650         const char *ifname_str = ifname_a ? blobmsg_data(ifname_a) : "";
 651         char *ifname;
 652
 653         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 654                 return UBUS_STATUS_PERMISSION_DENIED;
 655
 656         if (!host)
 657                 return UBUS_STATUS_INVALID_ARGUMENT;
 658
 659         dep = calloc_a(sizeof(*dep), &ifname, strlen(ifname_str) + 1);
 660         if (inet_pton(AF_INET, blobmsg_data(host), &dep->host) < 1) {
 661                 if (inet_pton(AF_INET6, blobmsg_data(host), &dep->host) < 1) {
 662                         free(dep);
 663                         return UBUS_STATUS_INVALID_ARGUMENT;
 664                 } else {
 665                         dep->v6 = true;
 666                 }
 667         }
 668
 669         dep->proto = state;
 670         dep->interface = strcpy(ifname, ifname_str);
 671
 672         dep->dep.cb = proto_shell_if_up_cb;
 673         interface_add_user(&dep->dep, NULL);
 674         list_add(&dep->list, &state->deps);
 675         proto_shell_update_host_dep(dep);
 676         if (!dep->dep.iface)
 677                 return UBUS_STATUS_NOT_FOUND;
 678
 679         return 0;
 680 }
 681
 682 static int
 683 proto_shell_setup_failed(struct proto_shell_state *state)
 684 {
 685         int ret = 0;
 686
 687         switch (state->sm) {
 688         case S_IDLE:
 689                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 690                 /* fall through */
 691         case S_SETUP:
 692                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 693                 break;
 694         case S_SETUP_ABORT:
 695         case S_TEARDOWN:
 696         default:
 697                 ret = UBUS_STATUS_PERMISSION_DENIED;
 698                 break;
 699         }
 700         return ret;
 701 }
 702
 703 static int
 704 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 705 {
 706         struct proto_shell_state *state;
 707         struct blob_attr *tb[__NOTIFY_LAST];
 708
 709         state = container_of(proto, struct proto_shell_state, proto);
 710
 711         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 712         if (!tb[NOTIFY_ACTION])
 713                 return UBUS_STATUS_INVALID_ARGUMENT;
 714
 715         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 716         case 0:
 717                 return proto_shell_update_link(state, attr, tb);
 718         case 1:
 719                 return proto_shell_run_command(state, tb);
 720         case 2:
 721                 return proto_shell_kill_command(state, tb);
 722         case 3:
 723                 return proto_shell_notify_error(state, tb);
 724         case 4:
 725                 return proto_shell_block_restart(state, tb);
 726         case 5:
 727                 return proto_shell_set_available(state, tb);
 728         case 6:
 729                 return proto_shell_add_host_dependency(state, tb);
 730         case 7:
 731                 return proto_shell_setup_failed(state);
 732         default:
 733                 return UBUS_STATUS_INVALID_ARGUMENT;
 734         }
 735 }
 736
 737 static struct interface_proto_state *
 738 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 739                    struct blob_attr *attr)
 740 {
 741         struct proto_shell_state *state;
 742
 743         state = calloc(1, sizeof(*state));
 744         INIT_LIST_HEAD(&state->deps);
 745
 746         state->config = malloc(blob_pad_len(attr));
 747         if (!state->config)
 748                 goto error;
 749
 750         memcpy(state->config, attr, blob_pad_len(attr));
 751         state->proto.free = proto_shell_free;
 752         state->proto.notify = proto_shell_notify;
 753         state->proto.cb = proto_shell_handler;
 754         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 755         state->script_task.cb = proto_shell_script_cb;
 756         state->script_task.dir_fd = proto_fd;
 757         state->script_task.log_prefix = iface->name;
 758         state->proto_task.cb = proto_shell_task_cb;
 759         state->proto_task.dir_fd = proto_fd;
 760         state->proto_task.log_prefix = iface->name;
 761         state->handler = container_of(h, struct proto_shell_handler, proto);
 762
 763         return &state->proto;
 764
 765 error:
 766         free(state);
 767         return NULL;
 768 }
 769
 770 static void
 771 proto_shell_add_handler(const char *script, const char *name, json_object *obj)
 772 {
 773         struct proto_shell_handler *handler;
 774         struct proto_handler *proto;
 775         json_object *config, *tmp;
 776         char *proto_name, *script_name;
 777
 778         handler = calloc_a(sizeof(*handler),
 779                            &proto_name, strlen(name) + 1,
 780                            &script_name, strlen(script) + 1);
 781         if (!handler)
 782                 return;
 783
 784         handler->script_name = strcpy(script_name, script);
 785
 786         proto = &handler->proto;
 787         proto->name = strcpy(proto_name, name);
 788         proto->config_params = &handler->config;
 789         proto->attach = proto_shell_attach;
 790
 791         tmp = json_get_field(obj, "no-device", json_type_boolean);
 792         if (tmp && json_object_get_boolean(tmp))
 793                 handler->proto.flags |= PROTO_FLAG_NODEV;
 794
 795         tmp = json_get_field(obj, "available", json_type_boolean);
 796         if (tmp && json_object_get_boolean(tmp))
 797                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 798
 799         tmp = json_get_field(obj, "renew-handler", json_type_boolean);
 800         if (tmp && json_object_get_boolean(tmp))
 801                 handler->proto.flags |= PROTO_FLAG_RENEW_AVAILABLE;
 802
 803         config = json_get_field(obj, "config", json_type_array);
 804         if (config)
 805                 handler->config_buf = netifd_handler_parse_config(&handler->config, config);
 806
 807         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 808         add_proto_handler(proto);
 809 }
 810
 811 void proto_shell_init(void)
 812 {
 813         proto_fd = netifd_open_subdir("proto");
 814         if (proto_fd < 0)
 815                 return;
 816
 817         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 818 }