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         bool no_proto_task;
  48
  49         struct uci_blob_param_list config;
  50 };
  51
  52 struct proto_shell_dependency {
  53         struct list_head list;
  54
  55         struct proto_shell_state *proto;
  56         struct interface_user dep;
  57
  58         union if_addr host;
  59         bool v6;
  60         bool any;
  61
  62         char interface[];
  63 };
  64
  65 struct proto_shell_state {
  66         struct interface_proto_state proto;
  67         struct proto_shell_handler *handler;
  68         struct blob_attr *config;
  69
  70         struct uloop_timeout teardown_timeout;
  71
  72         struct netifd_process script_task;
  73         struct netifd_process proto_task;
  74
  75         enum proto_shell_sm sm;
  76         bool proto_task_killed;
  77         bool renew_pending;
  78
  79         int last_error;
  80
  81         struct list_head deps;
  82 };
  83
  84 static void
  85 proto_shell_check_dependencies(struct proto_shell_state *state)
  86 {
  87         struct proto_shell_dependency *dep;
  88         bool available = true;
  89
  90         list_for_each_entry(dep, &state->deps, list) {
  91                 if (dep->dep.iface)
  92                         continue;
  93
  94                 available = false;
  95                 break;
  96         }
  97
  98         interface_set_available(state->proto.iface, available);
  99 }
 100
 101 static void
 102 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 103                      enum interface_event ev);
 104 static void
 105 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 106                        enum interface_event ev);
 107
 108 static void
 109 proto_shell_update_host_dep(struct proto_shell_dependency *dep)
 110 {
 111         struct interface *iface = NULL;
 112
 113         if (dep->dep.iface)
 114                 goto out;
 115
 116         if (dep->interface[0]) {
 117                 iface = vlist_find(&interfaces, dep->interface, iface, node);
 118
 119                 if (!iface || iface->state != IFS_UP)
 120                         goto out;
 121         }
 122
 123         if (!dep->any)
 124                 iface = interface_ip_add_target_route(&dep->host, dep->v6, iface);
 125
 126         if (!iface)
 127                 goto out;
 128
 129         interface_remove_user(&dep->dep);
 130         dep->dep.cb = proto_shell_if_down_cb;
 131         interface_add_user(&dep->dep, iface);
 132
 133 out:
 134         proto_shell_check_dependencies(dep->proto);
 135 }
 136
 137 static void
 138 proto_shell_clear_host_dep(struct proto_shell_state *state)
 139 {
 140         struct proto_shell_dependency *dep, *tmp;
 141
 142         list_for_each_entry_safe(dep, tmp, &state->deps, list) {
 143                 interface_remove_user(&dep->dep);
 144                 list_del(&dep->list);
 145                 free(dep);
 146         }
 147 }
 148
 149 static int
 150 proto_shell_handler(struct interface_proto_state *proto,
 151                     enum interface_proto_cmd cmd, bool force)
 152 {
 153         struct proto_shell_state *state;
 154         struct proto_shell_handler *handler;
 155         struct netifd_process *proc;
 156         static char error_buf[32];
 157         const char *argv[7];
 158         char *envp[2];
 159         const char *action;
 160         char *config;
 161         int ret, i = 0, j = 0;
 162
 163         state = container_of(proto, struct proto_shell_state, proto);
 164         handler = state->handler;
 165         proc = &state->script_task;
 166
 167         if (cmd == PROTO_CMD_SETUP) {
 168                 switch (state->sm) {
 169                 case S_IDLE:
 170                         action = "setup";
 171                         state->last_error = -1;
 172                         proto_shell_clear_host_dep(state);
 173                         state->sm = S_SETUP;
 174                         break;
 175
 176                 case S_SETUP_ABORT:
 177                 case S_TEARDOWN:
 178                 case S_SETUP:
 179                         return 0;
 180
 181                 default:
 182                         return -1;
 183                 }
 184         } else if (cmd == PROTO_CMD_RENEW) {
 185                 if (!(handler->proto.flags & PROTO_FLAG_RENEW_AVAILABLE))
 186                         return 0;
 187
 188                 if (state->script_task.uloop.pending) {
 189                         state->renew_pending = true;
 190                         return 0;
 191                 }
 192
 193                 state->renew_pending = false;
 194                 action = "renew";
 195         } else {
 196                 switch (state->sm) {
 197                 case S_SETUP:
 198                         if (state->script_task.uloop.pending) {
 199                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 200                                 kill(state->script_task.uloop.pid, SIGTERM);
 201                                 if (state->proto_task.uloop.pending)
 202                                         kill(state->proto_task.uloop.pid, SIGTERM);
 203                                 state->renew_pending = false;
 204                                 state->sm = S_SETUP_ABORT;
 205                                 return 0;
 206                         }
 207                 /* fall through if no script task is running */
 208                 case S_IDLE:
 209                         action = "teardown";
 210                         state->renew_pending = false;
 211                         state->sm = S_TEARDOWN;
 212                         if (state->last_error >= 0) {
 213                                 snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 214                                 envp[j++] = error_buf;
 215                         }
 216                         uloop_timeout_set(&state->teardown_timeout, 5000);
 217                         break;
 218
 219                 case S_TEARDOWN:
 220                         return 0;
 221
 222                 default:
 223                         return -1;
 224                 }
 225         }
 226
 227         D(INTERFACE, "run %s for interface '%s'\n", action, proto->iface->name);
 228         config = blobmsg_format_json(state->config, true);
 229         if (!config)
 230                 return -1;
 231
 232         argv[i++] = handler->script_name;
 233         argv[i++] = handler->proto.name;
 234         argv[i++] = action;
 235         argv[i++] = proto->iface->name;
 236         argv[i++] = config;
 237         if (proto->iface->main_dev.dev)
 238                 argv[i++] = proto->iface->main_dev.dev->ifname;
 239         argv[i] = NULL;
 240         envp[j] = NULL;
 241
 242         ret = netifd_start_process(argv, envp, proc);
 243         free(config);
 244
 245         return ret;
 246 }
 247
 248 static void
 249 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 250                      enum interface_event ev)
 251 {
 252         struct proto_shell_dependency *pdep;
 253
 254         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 255                 return;
 256
 257         pdep = container_of(dep, struct proto_shell_dependency, dep);
 258         proto_shell_update_host_dep(pdep);
 259 }
 260
 261 static void
 262 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 263                        enum interface_event ev)
 264 {
 265         struct proto_shell_dependency *pdep;
 266         struct proto_shell_state *state;
 267
 268         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 269                 return;
 270
 271         pdep = container_of(dep, struct proto_shell_dependency, dep);
 272         interface_remove_user(dep);
 273         dep->cb = proto_shell_if_up_cb;
 274         interface_add_user(dep, NULL);
 275
 276         state = pdep->proto;
 277         if (state->sm == S_IDLE) {
 278                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 279                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 280         }
 281 }
 282
 283 static void
 284 proto_shell_task_finish(struct proto_shell_state *state,
 285                         struct netifd_process *task)
 286 {
 287         switch (state->sm) {
 288         case S_IDLE:
 289                 if (task == &state->proto_task)
 290                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 291                 /* fall through */
 292         case S_SETUP:
 293                 if (task == &state->proto_task)
 294                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 295                                             false);
 296                 else if (task == &state->script_task) {
 297                         if (state->renew_pending)
 298                                 proto_shell_handler(&state->proto,
 299                                                     PROTO_CMD_RENEW, false);
 300                         else if (!state->handler->no_proto_task &&
 301                                  !state->proto_task.uloop.pending &&
 302                                  state->sm == S_SETUP)
 303                                 proto_shell_handler(&state->proto,
 304                                                     PROTO_CMD_TEARDOWN,
 305                                                     false);
 306                 }
 307                 break;
 308
 309         case S_SETUP_ABORT:
 310                 if (state->script_task.uloop.pending ||
 311                     state->proto_task.uloop.pending)
 312                         break;
 313
 314                 uloop_timeout_cancel(&state->teardown_timeout);
 315                 state->sm = S_IDLE;
 316                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 317                 break;
 318
 319         case S_TEARDOWN:
 320                 if (state->script_task.uloop.pending)
 321                         break;
 322
 323                 if (state->proto_task.uloop.pending) {
 324                         if (!state->proto_task_killed)
 325                                 kill(state->proto_task.uloop.pid, SIGTERM);
 326                         break;
 327                 }
 328
 329                 uloop_timeout_cancel(&state->teardown_timeout);
 330                 state->sm = S_IDLE;
 331                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 332                 break;
 333         }
 334 }
 335
 336 static void
 337 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 338 {
 339         struct proto_shell_state *state;
 340
 341         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 342
 343         netifd_kill_process(&state->script_task);
 344         netifd_kill_process(&state->proto_task);
 345         proto_shell_task_finish(state, NULL);
 346 }
 347
 348 static void
 349 proto_shell_script_cb(struct netifd_process *p, int ret)
 350 {
 351         struct proto_shell_state *state;
 352
 353         state = container_of(p, struct proto_shell_state, script_task);
 354         proto_shell_task_finish(state, p);
 355 }
 356
 357 static void
 358 proto_shell_task_cb(struct netifd_process *p, int ret)
 359 {
 360         struct proto_shell_state *state;
 361
 362         state = container_of(p, struct proto_shell_state, proto_task);
 363
 364         if (state->sm == S_IDLE || state->sm == S_SETUP)
 365                 state->last_error = WEXITSTATUS(ret);
 366
 367         proto_shell_task_finish(state, p);
 368 }
 369
 370 static void
 371 proto_shell_free(struct interface_proto_state *proto)
 372 {
 373         struct proto_shell_state *state;
 374
 375         state = container_of(proto, struct proto_shell_state, proto);
 376         uloop_timeout_cancel(&state->teardown_timeout);
 377         proto_shell_clear_host_dep(state);
 378         netifd_kill_process(&state->script_task);
 379         netifd_kill_process(&state->proto_task);
 380         free(state->config);
 381         free(state);
 382 }
 383
 384 static void
 385 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 386                              bool v6)
 387 {
 388         struct blob_attr *cur;
 389         int rem;
 390
 391         blobmsg_for_each_attr(cur, attr, rem) {
 392                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 393                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 394                         continue;
 395                 }
 396
 397                 interface_ip_add_route(iface, cur, v6);
 398         }
 399 }
 400
 401 static void
 402 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 403 {
 404         struct blob_attr *cur;
 405         int rem;
 406
 407         blobmsg_for_each_attr(cur, attr, rem)
 408                 interface_add_data(iface, cur);
 409 }
 410
 411 static struct device *
 412 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 413 {
 414         struct device *dev;
 415         struct blob_buf b;
 416
 417         memset(&b, 0, sizeof(b));
 418         blob_buf_init(&b, 0);
 419         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 420         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 421         blob_buf_free(&b);
 422
 423         return dev;
 424 }
 425
 426 enum {
 427         NOTIFY_ACTION,
 428         NOTIFY_ERROR,
 429         NOTIFY_COMMAND,
 430         NOTIFY_ENV,
 431         NOTIFY_SIGNAL,
 432         NOTIFY_AVAILABLE,
 433         NOTIFY_LINK_UP,
 434         NOTIFY_IFNAME,
 435         NOTIFY_ADDR_EXT,
 436         NOTIFY_ROUTES,
 437         NOTIFY_ROUTES6,
 438         NOTIFY_TUNNEL,
 439         NOTIFY_DATA,
 440         NOTIFY_KEEP,
 441         NOTIFY_HOST,
 442         NOTIFY_DNS,
 443         NOTIFY_DNS_SEARCH,
 444         __NOTIFY_LAST
 445 };
 446
 447 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 448         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 449         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 450         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 451         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 452         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 453         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 454         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 455         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 456         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 457         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 458         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 459         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 460         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 461         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 462         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 463         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 464         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 465 };
 466
 467 static int
 468 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 469 {
 470         struct interface *iface = state->proto.iface;
 471         struct blob_attr *cur;
 472         struct device *dev;
 473         const char *devname;
 474         int dev_create = 1;
 475         bool addr_ext = false;
 476         bool keep = false;
 477         bool up;
 478
 479         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 480                 return UBUS_STATUS_PERMISSION_DENIED;
 481
 482         if (!tb[NOTIFY_LINK_UP])
 483                 return UBUS_STATUS_INVALID_ARGUMENT;
 484
 485         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 486         if (!up) {
 487                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 488                 return 0;
 489         }
 490
 491         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 492                 keep = blobmsg_get_bool(cur);
 493
 494         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 495                 addr_ext = blobmsg_get_bool(cur);
 496                 if (addr_ext)
 497                         dev_create = 2;
 498         }
 499
 500         if (iface->state != IFS_UP || !iface->l3_dev.dev)
 501                 keep = false;
 502
 503         if (!keep) {
 504                 dev = iface->main_dev.dev;
 505                 if (tb[NOTIFY_IFNAME]) {
 506                         keep = false;
 507                         devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 508                         if (tb[NOTIFY_TUNNEL])
 509                                 dev = proto_shell_create_tunnel(devname, tb[NOTIFY_TUNNEL]);
 510                         else
 511                                 dev = device_get(devname, dev_create);
 512                 }
 513
 514                 if (!dev)
 515                         return UBUS_STATUS_INVALID_ARGUMENT;
 516
 517                 interface_set_l3_dev(iface, dev);
 518                 if (device_claim(&iface->l3_dev) < 0)
 519                         return UBUS_STATUS_UNKNOWN_ERROR;
 520
 521                 device_set_present(dev, true);
 522
 523                 interface_update_start(iface);
 524         }
 525
 526         proto_apply_ip_settings(iface, data, addr_ext);
 527
 528         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 529                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 530
 531         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 532                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 533
 534         if ((cur = tb[NOTIFY_DNS]))
 535                 interface_add_dns_server_list(&iface->proto_ip, cur);
 536
 537         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 538                 interface_add_dns_search_list(&iface->proto_ip, cur);
 539
 540         if ((cur = tb[NOTIFY_DATA]))
 541                 proto_shell_parse_data(state->proto.iface, cur);
 542
 543         interface_update_complete(state->proto.iface);
 544
 545         if ((state->sm != S_SETUP_ABORT) && (state->sm != S_TEARDOWN)) {
 546                 if (!keep)
 547                         state->proto.proto_event(&state->proto, IFPEV_UP);
 548                 state->sm = S_IDLE;
 549         }
 550
 551         return 0;
 552 }
 553
 554 static bool
 555 fill_string_list(struct blob_attr *attr, char **argv, int max)
 556 {
 557         struct blob_attr *cur;
 558         int argc = 0;
 559         int rem;
 560
 561         if (!attr)
 562                 goto out;
 563
 564         blobmsg_for_each_attr(cur, attr, rem) {
 565                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 566                         return false;
 567
 568                 if (!blobmsg_check_attr(cur, NULL))
 569                         return false;
 570
 571                 argv[argc++] = blobmsg_data(cur);
 572                 if (argc == max - 1)
 573                         return false;
 574         }
 575
 576 out:
 577         argv[argc] = NULL;
 578         return true;
 579 }
 580
 581 static int
 582 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 583 {
 584         static char *argv[64];
 585         static char *env[32];
 586
 587         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 588                 return UBUS_STATUS_PERMISSION_DENIED;
 589
 590         if (!tb[NOTIFY_COMMAND])
 591                 goto error;
 592
 593         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 594                 goto error;
 595
 596         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 597                 goto error;
 598
 599         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 600
 601         return 0;
 602
 603 error:
 604         return UBUS_STATUS_INVALID_ARGUMENT;
 605 }
 606
 607 static int
 608 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 609 {
 610         unsigned int signal = ~0;
 611
 612         if (tb[NOTIFY_SIGNAL])
 613                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 614
 615         if (signal > 31)
 616                 signal = SIGTERM;
 617
 618         if (state->proto_task.uloop.pending) {
 619                 if (signal == SIGTERM || signal == SIGKILL)
 620                         state->proto_task_killed = true;
 621                 kill(state->proto_task.uloop.pid, signal);
 622         }
 623
 624         return 0;
 625 }
 626
 627 static int
 628 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 629 {
 630         struct blob_attr *cur;
 631         char *data[16];
 632         int n_data = 0;
 633         int rem;
 634
 635         if (!tb[NOTIFY_ERROR])
 636                 return UBUS_STATUS_INVALID_ARGUMENT;
 637
 638         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 639                 if (n_data + 1 == ARRAY_SIZE(data))
 640                         goto error;
 641
 642                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 643                         goto error;
 644
 645                 if (!blobmsg_check_attr(cur, NULL))
 646                         goto error;
 647
 648                 data[n_data++] = blobmsg_data(cur);
 649         }
 650
 651         if (!n_data)
 652                 goto error;
 653
 654         interface_add_error(state->proto.iface, state->handler->proto.name,
 655                         data[0], (const char **) &data[1], n_data - 1);
 656
 657         return 0;
 658
 659 error:
 660         return UBUS_STATUS_INVALID_ARGUMENT;
 661 }
 662
 663 static int
 664 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 665 {
 666         state->proto.iface->autostart = false;
 667         return 0;
 668 }
 669
 670 static int
 671 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 672 {
 673         if (!tb[NOTIFY_AVAILABLE])
 674                 return UBUS_STATUS_INVALID_ARGUMENT;
 675
 676         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 677         return 0;
 678 }
 679
 680 static int
 681 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 682 {
 683         struct proto_shell_dependency *dep;
 684         const char *ifname = tb[NOTIFY_IFNAME] ? blobmsg_data(tb[NOTIFY_IFNAME]) : "";
 685         const char *host = tb[NOTIFY_HOST] ? blobmsg_data(tb[NOTIFY_HOST]) : "";
 686
 687         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 688                 return UBUS_STATUS_PERMISSION_DENIED;
 689
 690         dep = calloc(1, sizeof(*dep) + strlen(ifname) + 1);
 691
 692         if (!host[0] && ifname[0]) {
 693                 dep->any = true;
 694         } else if (inet_pton(AF_INET, host, &dep->host) < 1) {
 695                 if (inet_pton(AF_INET6, host, &dep->host) < 1) {
 696                         free(dep);
 697                         return UBUS_STATUS_INVALID_ARGUMENT;
 698                 } else {
 699                         dep->v6 = true;
 700                 }
 701         }
 702
 703         dep->proto = state;
 704         strcpy(dep->interface, ifname);
 705
 706         dep->dep.cb = proto_shell_if_up_cb;
 707         interface_add_user(&dep->dep, NULL);
 708         list_add(&dep->list, &state->deps);
 709         proto_shell_update_host_dep(dep);
 710         if (!dep->dep.iface)
 711                 return UBUS_STATUS_NOT_FOUND;
 712
 713         return 0;
 714 }
 715
 716 static int
 717 proto_shell_setup_failed(struct proto_shell_state *state)
 718 {
 719         int ret = 0;
 720
 721         switch (state->sm) {
 722         case S_IDLE:
 723                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 724                 /* fall through */
 725         case S_SETUP:
 726                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 727                 break;
 728         case S_SETUP_ABORT:
 729         case S_TEARDOWN:
 730         default:
 731                 ret = UBUS_STATUS_PERMISSION_DENIED;
 732                 break;
 733         }
 734         return ret;
 735 }
 736
 737 static int
 738 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 739 {
 740         struct proto_shell_state *state;
 741         struct blob_attr *tb[__NOTIFY_LAST];
 742
 743         state = container_of(proto, struct proto_shell_state, proto);
 744
 745         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 746         if (!tb[NOTIFY_ACTION])
 747                 return UBUS_STATUS_INVALID_ARGUMENT;
 748
 749         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 750         case 0:
 751                 return proto_shell_update_link(state, attr, tb);
 752         case 1:
 753                 return proto_shell_run_command(state, tb);
 754         case 2:
 755                 return proto_shell_kill_command(state, tb);
 756         case 3:
 757                 return proto_shell_notify_error(state, tb);
 758         case 4:
 759                 return proto_shell_block_restart(state, tb);
 760         case 5:
 761                 return proto_shell_set_available(state, tb);
 762         case 6:
 763                 return proto_shell_add_host_dependency(state, tb);
 764         case 7:
 765                 return proto_shell_setup_failed(state);
 766         default:
 767                 return UBUS_STATUS_INVALID_ARGUMENT;
 768         }
 769 }
 770
 771 static struct interface_proto_state *
 772 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 773                    struct blob_attr *attr)
 774 {
 775         struct proto_shell_state *state;
 776
 777         state = calloc(1, sizeof(*state));
 778         INIT_LIST_HEAD(&state->deps);
 779
 780         state->config = malloc(blob_pad_len(attr));
 781         if (!state->config)
 782                 goto error;
 783
 784         memcpy(state->config, attr, blob_pad_len(attr));
 785         state->proto.free = proto_shell_free;
 786         state->proto.notify = proto_shell_notify;
 787         state->proto.cb = proto_shell_handler;
 788         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 789         state->script_task.cb = proto_shell_script_cb;
 790         state->script_task.dir_fd = proto_fd;
 791         state->script_task.log_prefix = iface->name;
 792         state->proto_task.cb = proto_shell_task_cb;
 793         state->proto_task.dir_fd = proto_fd;
 794         state->proto_task.log_prefix = iface->name;
 795         state->handler = container_of(h, struct proto_shell_handler, proto);
 796
 797         return &state->proto;
 798
 799 error:
 800         free(state);
 801         return NULL;
 802 }
 803
 804 static void
 805 proto_shell_add_handler(const char *script, const char *name, json_object *obj)
 806 {
 807         struct proto_shell_handler *handler;
 808         struct proto_handler *proto;
 809         json_object *config, *tmp;
 810         char *proto_name, *script_name;
 811
 812         handler = calloc_a(sizeof(*handler),
 813                            &proto_name, strlen(name) + 1,
 814                            &script_name, strlen(script) + 1);
 815         if (!handler)
 816                 return;
 817
 818         handler->script_name = strcpy(script_name, script);
 819
 820         proto = &handler->proto;
 821         proto->name = strcpy(proto_name, name);
 822         proto->config_params = &handler->config;
 823         proto->attach = proto_shell_attach;
 824
 825         tmp = json_get_field(obj, "no-device", json_type_boolean);
 826         if (tmp && json_object_get_boolean(tmp))
 827                 handler->proto.flags |= PROTO_FLAG_NODEV;
 828
 829         tmp = json_get_field(obj, "no-proto-task", json_type_boolean);
 830         handler->no_proto_task = tmp && json_object_get_boolean(tmp);
 831
 832         tmp = json_get_field(obj, "available", json_type_boolean);
 833         if (tmp && json_object_get_boolean(tmp))
 834                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 835
 836         tmp = json_get_field(obj, "renew-handler", json_type_boolean);
 837         if (tmp && json_object_get_boolean(tmp))
 838                 handler->proto.flags |= PROTO_FLAG_RENEW_AVAILABLE;
 839
 840         tmp = json_get_field(obj, "lasterror", json_type_boolean);
 841         if (tmp && json_object_get_boolean(tmp))
 842                 handler->proto.flags |= PROTO_FLAG_LASTERROR;
 843
 844         config = json_get_field(obj, "config", json_type_array);
 845         if (config)
 846                 handler->config_buf = netifd_handler_parse_config(&handler->config, config);
 847
 848         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 849         add_proto_handler(proto);
 850 }
 851
 852 void proto_shell_init(void)
 853 {
 854         proto_fd = netifd_open_subdir("proto");
 855         if (proto_fd < 0)
 856                 return;
 857
 858         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 859 }