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         struct proto_shell_state *proto;
  55         struct interface_user dep;
  56
  57         union if_addr host;
  58         bool v6;
  59         bool any;
  60
  61         char interface[];
  62 };
  63
  64 struct proto_shell_state {
  65         struct interface_proto_state proto;
  66         struct proto_shell_handler *handler;
  67         struct blob_attr *config;
  68
  69         struct uloop_timeout teardown_timeout;
  70
  71         /*
  72          * Teardown and setup interface again if it is still not up (IFS_UP)
  73          * after checkup_interval seconds since previous attempt.  This check
  74          * will be disabled when the config option "checkup_interval" is
  75          * missing or has a negative value
  76          */
  77         int checkup_interval;
  78         struct uloop_timeout checkup_timeout;
  79
  80         struct netifd_process script_task;
  81         struct netifd_process proto_task;
  82
  83         enum proto_shell_sm sm;
  84         bool proto_task_killed;
  85         bool renew_pending;
  86
  87         int last_error;
  88
  89         struct list_head deps;
  90 };
  91
  92 static void
  93 proto_shell_check_dependencies(struct proto_shell_state *state)
  94 {
  95         struct proto_shell_dependency *dep;
  96         bool available = true;
  97
  98         list_for_each_entry(dep, &state->deps, list) {
  99                 if (dep->dep.iface)
 100                         continue;
 101
 102                 available = false;
 103                 break;
 104         }
 105
 106         interface_set_available(state->proto.iface, available);
 107 }
 108
 109 static void
 110 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 111                      enum interface_event ev);
 112 static void
 113 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 114                        enum interface_event ev);
 115
 116 static void
 117 proto_shell_update_host_dep(struct proto_shell_dependency *dep)
 118 {
 119         struct interface *iface = NULL;
 120
 121         if (dep->dep.iface)
 122                 goto out;
 123
 124         if (dep->interface[0]) {
 125                 iface = vlist_find(&interfaces, dep->interface, iface, node);
 126
 127                 if (!iface || iface->state != IFS_UP)
 128                         goto out;
 129         }
 130
 131         if (!dep->any)
 132                 iface = interface_ip_add_target_route(&dep->host, dep->v6, iface);
 133
 134         if (!iface)
 135                 goto out;
 136
 137         interface_remove_user(&dep->dep);
 138         dep->dep.cb = proto_shell_if_down_cb;
 139         interface_add_user(&dep->dep, iface);
 140
 141 out:
 142         proto_shell_check_dependencies(dep->proto);
 143 }
 144
 145 static void
 146 proto_shell_clear_host_dep(struct proto_shell_state *state)
 147 {
 148         struct proto_shell_dependency *dep, *tmp;
 149
 150         list_for_each_entry_safe(dep, tmp, &state->deps, list) {
 151                 interface_remove_user(&dep->dep);
 152                 list_del(&dep->list);
 153                 free(dep);
 154         }
 155 }
 156
 157 static int
 158 proto_shell_handler(struct interface_proto_state *proto,
 159                     enum interface_proto_cmd cmd, bool force)
 160 {
 161         struct proto_shell_state *state;
 162         struct proto_shell_handler *handler;
 163         struct netifd_process *proc;
 164         static char error_buf[32];
 165         const char *argv[7];
 166         char *envp[2];
 167         const char *action;
 168         char *config;
 169         int ret, i = 0, j = 0;
 170
 171         state = container_of(proto, struct proto_shell_state, proto);
 172         handler = state->handler;
 173         proc = &state->script_task;
 174
 175         if (cmd == PROTO_CMD_SETUP) {
 176                 switch (state->sm) {
 177                 case S_IDLE:
 178                         action = "setup";
 179                         state->last_error = -1;
 180                         proto_shell_clear_host_dep(state);
 181                         state->sm = S_SETUP;
 182                         break;
 183
 184                 default:
 185                         return -1;
 186                 }
 187         } else if (cmd == PROTO_CMD_RENEW) {
 188                 if (!(handler->proto.flags & PROTO_FLAG_RENEW_AVAILABLE))
 189                         return 0;
 190
 191                 if (state->script_task.uloop.pending) {
 192                         state->renew_pending = true;
 193                         return 0;
 194                 }
 195
 196                 state->renew_pending = false;
 197                 action = "renew";
 198         } else {
 199                 switch (state->sm) {
 200                 case S_SETUP:
 201                         if (state->script_task.uloop.pending) {
 202                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 203                                 kill(state->script_task.uloop.pid, SIGTERM);
 204                                 if (state->proto_task.uloop.pending)
 205                                         kill(state->proto_task.uloop.pid, SIGTERM);
 206                                 state->renew_pending = false;
 207                                 state->sm = S_SETUP_ABORT;
 208                                 return 0;
 209                         }
 210                 /* if no script task is running */
 211                 /* fall through */
 212                 case S_IDLE:
 213                         action = "teardown";
 214                         state->renew_pending = false;
 215                         state->sm = S_TEARDOWN;
 216                         if (state->last_error >= 0) {
 217                                 snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 218                                 envp[j++] = error_buf;
 219                         }
 220                         uloop_timeout_set(&state->teardown_timeout, 5000);
 221                         break;
 222
 223                 case S_TEARDOWN:
 224                         return 0;
 225
 226                 default:
 227                         return -1;
 228                 }
 229         }
 230
 231         D(INTERFACE, "run %s for interface '%s'\n", action, proto->iface->name);
 232         config = blobmsg_format_json(state->config, true);
 233         if (!config)
 234                 return -1;
 235
 236         argv[i++] = handler->script_name;
 237         argv[i++] = handler->proto.name;
 238         argv[i++] = action;
 239         argv[i++] = proto->iface->name;
 240         argv[i++] = config;
 241         if (proto->iface->main_dev.dev)
 242                 argv[i++] = proto->iface->main_dev.dev->ifname;
 243         argv[i] = NULL;
 244         envp[j] = NULL;
 245
 246         ret = netifd_start_process(argv, envp, proc);
 247         free(config);
 248
 249         return ret;
 250 }
 251
 252 static void
 253 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 254                      enum interface_event ev)
 255 {
 256         struct proto_shell_dependency *pdep;
 257
 258         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 259                 return;
 260
 261         pdep = container_of(dep, struct proto_shell_dependency, dep);
 262         proto_shell_update_host_dep(pdep);
 263 }
 264
 265 static void
 266 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 267                        enum interface_event ev)
 268 {
 269         struct proto_shell_dependency *pdep;
 270         struct proto_shell_state *state;
 271
 272         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 273                 return;
 274
 275         pdep = container_of(dep, struct proto_shell_dependency, dep);
 276         interface_remove_user(dep);
 277         dep->cb = proto_shell_if_up_cb;
 278         interface_add_user(dep, NULL);
 279
 280         state = pdep->proto;
 281         if (state->sm == S_IDLE) {
 282                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 283                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 284         }
 285 }
 286
 287 static void
 288 proto_shell_task_finish(struct proto_shell_state *state,
 289                         struct netifd_process *task)
 290 {
 291         switch (state->sm) {
 292         case S_IDLE:
 293                 if (task == &state->proto_task)
 294                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 295                 /* fall through */
 296         case S_SETUP:
 297                 if (task == &state->proto_task)
 298                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 299                                             false);
 300                 else if (task == &state->script_task) {
 301                         if (state->renew_pending)
 302                                 proto_shell_handler(&state->proto,
 303                                                     PROTO_CMD_RENEW, false);
 304                         else if (!(state->handler->proto.flags & PROTO_FLAG_NO_TASK) &&
 305                                  !state->proto_task.uloop.pending &&
 306                                  state->sm == S_SETUP)
 307                                 proto_shell_handler(&state->proto,
 308                                                     PROTO_CMD_TEARDOWN,
 309                                                     false);
 310
 311                         /* check up status after setup attempt by this script_task */
 312                         if (state->sm == S_SETUP && state->checkup_interval > 0) {
 313                                 uloop_timeout_set(&state->checkup_timeout,
 314                                                   state->checkup_interval * 1000);
 315                         }
 316                 }
 317                 break;
 318
 319         case S_SETUP_ABORT:
 320                 if (state->script_task.uloop.pending ||
 321                     state->proto_task.uloop.pending)
 322                         break;
 323
 324                 /* completed aborting all tasks, now idle */
 325                 uloop_timeout_cancel(&state->teardown_timeout);
 326                 uloop_timeout_cancel(&state->checkup_timeout);
 327                 state->sm = S_IDLE;
 328                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 329                 break;
 330
 331         case S_TEARDOWN:
 332                 if (state->script_task.uloop.pending)
 333                         break;
 334
 335                 if (state->proto_task.uloop.pending) {
 336                         if (!state->proto_task_killed)
 337                                 kill(state->proto_task.uloop.pid, SIGTERM);
 338                         break;
 339                 }
 340
 341                 /* completed tearing down all tasks, now idle */
 342                 uloop_timeout_cancel(&state->teardown_timeout);
 343                 uloop_timeout_cancel(&state->checkup_timeout);
 344                 state->sm = S_IDLE;
 345                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 346                 break;
 347         }
 348 }
 349
 350 static void
 351 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 352 {
 353         struct proto_shell_state *state;
 354
 355         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 356
 357         netifd_kill_process(&state->script_task);
 358         netifd_kill_process(&state->proto_task);
 359         proto_shell_task_finish(state, NULL);
 360 }
 361
 362 static void
 363 proto_shell_script_cb(struct netifd_process *p, int ret)
 364 {
 365         struct proto_shell_state *state;
 366
 367         state = container_of(p, struct proto_shell_state, script_task);
 368         proto_shell_task_finish(state, p);
 369 }
 370
 371 static void
 372 proto_shell_task_cb(struct netifd_process *p, int ret)
 373 {
 374         struct proto_shell_state *state;
 375
 376         state = container_of(p, struct proto_shell_state, proto_task);
 377
 378         if (state->sm == S_IDLE || state->sm == S_SETUP)
 379                 state->last_error = WEXITSTATUS(ret);
 380
 381         proto_shell_task_finish(state, p);
 382 }
 383
 384 static void
 385 proto_shell_free(struct interface_proto_state *proto)
 386 {
 387         struct proto_shell_state *state;
 388
 389         state = container_of(proto, struct proto_shell_state, proto);
 390         uloop_timeout_cancel(&state->teardown_timeout);
 391         uloop_timeout_cancel(&state->checkup_timeout);
 392         proto_shell_clear_host_dep(state);
 393         netifd_kill_process(&state->script_task);
 394         netifd_kill_process(&state->proto_task);
 395         free(state->config);
 396         free(state);
 397 }
 398
 399 static void
 400 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 401                              bool v6)
 402 {
 403         struct blob_attr *cur;
 404         int rem;
 405
 406         blobmsg_for_each_attr(cur, attr, rem) {
 407                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 408                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 409                         continue;
 410                 }
 411
 412                 interface_ip_add_route(iface, cur, v6);
 413         }
 414 }
 415
 416 static void
 417 proto_shell_parse_neighbor_list(struct interface *iface, struct blob_attr *attr,
 418                                 bool v6)
 419 {
 420         struct blob_attr *cur;
 421         int rem;
 422
 423         blobmsg_for_each_attr(cur, attr, rem) {
 424                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 425                         DPRINTF("Ignore wrong neighbor type: %d\n", blobmsg_type(cur));
 426                         continue;
 427                 }
 428
 429                 interface_ip_add_neighbor(iface, cur, v6);
 430         }
 431 }
 432
 433 static void
 434 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 435 {
 436         struct blob_attr *cur;
 437         int rem;
 438
 439         blobmsg_for_each_attr(cur, attr, rem)
 440                 interface_add_data(iface, cur);
 441 }
 442
 443 static struct device *
 444 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 445 {
 446         struct device *dev;
 447         struct blob_buf b;
 448
 449         memset(&b, 0, sizeof(b));
 450         blob_buf_init(&b, 0);
 451         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 452         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 453         blob_buf_free(&b);
 454
 455         return dev;
 456 }
 457
 458 enum {
 459         NOTIFY_ACTION,
 460         NOTIFY_ERROR,
 461         NOTIFY_COMMAND,
 462         NOTIFY_ENV,
 463         NOTIFY_SIGNAL,
 464         NOTIFY_AVAILABLE,
 465         NOTIFY_LINK_UP,
 466         NOTIFY_IFNAME,
 467         NOTIFY_ADDR_EXT,
 468         NOTIFY_ROUTES,
 469         NOTIFY_ROUTES6,
 470         NOTIFY_TUNNEL,
 471         NOTIFY_DATA,
 472         NOTIFY_KEEP,
 473         NOTIFY_HOST,
 474         NOTIFY_DNS,
 475         NOTIFY_DNS_SEARCH,
 476         NOTIFY_NEIGHBORS,
 477         NOTIFY_NEIGHBORS6,
 478         __NOTIFY_LAST
 479 };
 480
 481 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 482         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 483         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 484         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 485         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 486         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 487         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 488         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 489         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 490         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 491         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 492         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 493         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 494         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 495         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 496         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 497         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 498         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 499         [NOTIFY_NEIGHBORS]= {.name = "neighbor", .type = BLOBMSG_TYPE_ARRAY},
 500         [NOTIFY_NEIGHBORS6]= {.name = "neighbor6", .type = BLOBMSG_TYPE_ARRAY},
 501 };
 502
 503 static int
 504 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 505 {
 506         struct interface *iface = state->proto.iface;
 507         struct blob_attr *cur;
 508         struct device *dev;
 509         const char *devname;
 510         int dev_create = 1;
 511         bool addr_ext = false;
 512         bool keep = false;
 513         bool up;
 514
 515         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 516                 return UBUS_STATUS_PERMISSION_DENIED;
 517
 518         if (!tb[NOTIFY_LINK_UP])
 519                 return UBUS_STATUS_INVALID_ARGUMENT;
 520
 521         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 522         if (!up) {
 523                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 524                 return 0;
 525         }
 526
 527         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 528                 keep = blobmsg_get_bool(cur);
 529
 530         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 531                 addr_ext = blobmsg_get_bool(cur);
 532                 if (addr_ext)
 533                         dev_create = 2;
 534         }
 535
 536         if (iface->state != IFS_UP || !iface->l3_dev.dev)
 537                 keep = false;
 538
 539         if (!keep) {
 540                 dev = iface->main_dev.dev;
 541                 if (tb[NOTIFY_IFNAME]) {
 542                         keep = false;
 543                         devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 544                         if (tb[NOTIFY_TUNNEL])
 545                                 dev = proto_shell_create_tunnel(devname, tb[NOTIFY_TUNNEL]);
 546                         else
 547                                 dev = device_get(devname, dev_create);
 548                 }
 549
 550                 if (!dev)
 551                         return UBUS_STATUS_INVALID_ARGUMENT;
 552
 553                 interface_set_l3_dev(iface, dev);
 554                 if (device_claim(&iface->l3_dev) < 0)
 555                         return UBUS_STATUS_UNKNOWN_ERROR;
 556
 557                 device_set_present(dev, true);
 558         }
 559
 560         interface_update_start(iface, keep);
 561
 562         proto_apply_ip_settings(iface, data, addr_ext);
 563
 564         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 565                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 566
 567         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 568                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 569
 570         if ((cur = tb[NOTIFY_NEIGHBORS]) != NULL)
 571                 proto_shell_parse_neighbor_list(state->proto.iface, cur, false);
 572
 573         if ((cur = tb[NOTIFY_NEIGHBORS6]) != NULL)
 574                 proto_shell_parse_neighbor_list(state->proto.iface, cur, true);
 575
 576         if ((cur = tb[NOTIFY_DNS]))
 577                 interface_add_dns_server_list(&iface->proto_ip, cur);
 578
 579         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 580                 interface_add_dns_search_list(&iface->proto_ip, cur);
 581
 582         if ((cur = tb[NOTIFY_DATA]))
 583                 proto_shell_parse_data(state->proto.iface, cur);
 584
 585         interface_update_complete(state->proto.iface);
 586
 587         if ((state->sm != S_SETUP_ABORT) && (state->sm != S_TEARDOWN)) {
 588                 state->proto.proto_event(&state->proto, IFPEV_UP);
 589                 state->sm = S_IDLE;
 590         }
 591
 592         return 0;
 593 }
 594
 595 static bool
 596 fill_string_list(struct blob_attr *attr, char **argv, int max)
 597 {
 598         struct blob_attr *cur;
 599         int argc = 0;
 600         int rem;
 601
 602         if (!attr)
 603                 goto out;
 604
 605         blobmsg_for_each_attr(cur, attr, rem) {
 606                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 607                         return false;
 608
 609                 if (!blobmsg_check_attr(cur, false))
 610                         return false;
 611
 612                 argv[argc++] = blobmsg_data(cur);
 613                 if (argc == max - 1)
 614                         return false;
 615         }
 616
 617 out:
 618         argv[argc] = NULL;
 619         return true;
 620 }
 621
 622 static int
 623 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 624 {
 625         static char *argv[64];
 626         static char *env[32];
 627
 628         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 629                 return UBUS_STATUS_PERMISSION_DENIED;
 630
 631         if (!tb[NOTIFY_COMMAND])
 632                 goto error;
 633
 634         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 635                 goto error;
 636
 637         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 638                 goto error;
 639
 640         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 641
 642         return 0;
 643
 644 error:
 645         return UBUS_STATUS_INVALID_ARGUMENT;
 646 }
 647
 648 static int
 649 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 650 {
 651         unsigned int signal = ~0;
 652
 653         if (tb[NOTIFY_SIGNAL])
 654                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 655
 656         if (signal > 31)
 657                 signal = SIGTERM;
 658
 659         if (state->proto_task.uloop.pending) {
 660                 if (signal == SIGTERM || signal == SIGKILL)
 661                         state->proto_task_killed = true;
 662                 kill(state->proto_task.uloop.pid, signal);
 663         }
 664
 665         return 0;
 666 }
 667
 668 static int
 669 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 670 {
 671         struct blob_attr *cur;
 672         char *data[16];
 673         int n_data = 0;
 674         int rem;
 675
 676         if (!tb[NOTIFY_ERROR])
 677                 return UBUS_STATUS_INVALID_ARGUMENT;
 678
 679         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 680                 if (n_data + 1 == ARRAY_SIZE(data))
 681                         goto error;
 682
 683                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 684                         goto error;
 685
 686                 if (!blobmsg_check_attr(cur, false))
 687                         goto error;
 688
 689                 data[n_data++] = blobmsg_data(cur);
 690         }
 691
 692         if (!n_data)
 693                 goto error;
 694
 695         interface_add_error(state->proto.iface, state->handler->proto.name,
 696                         data[0], (const char **) &data[1], n_data - 1);
 697
 698         return 0;
 699
 700 error:
 701         return UBUS_STATUS_INVALID_ARGUMENT;
 702 }
 703
 704 static int
 705 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 706 {
 707         state->proto.iface->autostart = false;
 708         return 0;
 709 }
 710
 711 static int
 712 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 713 {
 714         if (!tb[NOTIFY_AVAILABLE])
 715                 return UBUS_STATUS_INVALID_ARGUMENT;
 716
 717         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 718         return 0;
 719 }
 720
 721 static int
 722 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 723 {
 724         struct proto_shell_dependency *dep;
 725         const char *ifname = tb[NOTIFY_IFNAME] ? blobmsg_data(tb[NOTIFY_IFNAME]) : "";
 726         const char *host = tb[NOTIFY_HOST] ? blobmsg_data(tb[NOTIFY_HOST]) : "";
 727
 728         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 729                 return UBUS_STATUS_PERMISSION_DENIED;
 730
 731         dep = calloc(1, sizeof(*dep) + strlen(ifname) + 1);
 732         if (!dep)
 733                 return UBUS_STATUS_UNKNOWN_ERROR;
 734
 735         if (!host[0] && ifname[0]) {
 736                 dep->any = true;
 737         } else if (inet_pton(AF_INET, host, &dep->host) < 1) {
 738                 if (inet_pton(AF_INET6, host, &dep->host) < 1) {
 739                         free(dep);
 740                         return UBUS_STATUS_INVALID_ARGUMENT;
 741                 } else {
 742                         dep->v6 = true;
 743                 }
 744         }
 745
 746         dep->proto = state;
 747         strcpy(dep->interface, ifname);
 748
 749         dep->dep.cb = proto_shell_if_up_cb;
 750         interface_add_user(&dep->dep, NULL);
 751         list_add(&dep->list, &state->deps);
 752         proto_shell_update_host_dep(dep);
 753         if (!dep->dep.iface)
 754                 return UBUS_STATUS_NOT_FOUND;
 755
 756         return 0;
 757 }
 758
 759 static int
 760 proto_shell_setup_failed(struct proto_shell_state *state)
 761 {
 762         int ret = 0;
 763
 764         switch (state->sm) {
 765         case S_IDLE:
 766                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 767                 /* fall through */
 768         case S_SETUP:
 769                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 770                 break;
 771         case S_SETUP_ABORT:
 772         case S_TEARDOWN:
 773         default:
 774                 ret = UBUS_STATUS_PERMISSION_DENIED;
 775                 break;
 776         }
 777         return ret;
 778 }
 779
 780 static int
 781 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 782 {
 783         struct proto_shell_state *state;
 784         struct blob_attr *tb[__NOTIFY_LAST];
 785
 786         state = container_of(proto, struct proto_shell_state, proto);
 787
 788         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 789         if (!tb[NOTIFY_ACTION])
 790                 return UBUS_STATUS_INVALID_ARGUMENT;
 791
 792         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 793         case 0:
 794                 return proto_shell_update_link(state, attr, tb);
 795         case 1:
 796                 return proto_shell_run_command(state, tb);
 797         case 2:
 798                 return proto_shell_kill_command(state, tb);
 799         case 3:
 800                 return proto_shell_notify_error(state, tb);
 801         case 4:
 802                 return proto_shell_block_restart(state, tb);
 803         case 5:
 804                 return proto_shell_set_available(state, tb);
 805         case 6:
 806                 return proto_shell_add_host_dependency(state, tb);
 807         case 7:
 808                 return proto_shell_setup_failed(state);
 809         default:
 810                 return UBUS_STATUS_INVALID_ARGUMENT;
 811         }
 812 }
 813
 814 static void
 815 proto_shell_checkup_timeout_cb(struct uloop_timeout *timeout)
 816 {
 817         struct proto_shell_state *state = container_of(timeout, struct
 818                         proto_shell_state, checkup_timeout);
 819         struct interface_proto_state *proto = &state->proto;
 820         struct interface *iface = proto->iface;
 821
 822         if (!iface->autostart)
 823                 return;
 824
 825         if (iface->state == IFS_UP)
 826                 return;
 827
 828         D(INTERFACE, "Interface '%s' is not up after %d sec\n",
 829                         iface->name, state->checkup_interval);
 830         proto_shell_handler(proto, PROTO_CMD_TEARDOWN, false);
 831 }
 832
 833 static void
 834 proto_shell_checkup_attach(struct proto_shell_state *state,
 835                 const struct blob_attr *attr)
 836 {
 837         struct blob_attr *tb;
 838         struct blobmsg_policy checkup_policy = {
 839                 .name = "checkup_interval",
 840                 .type = BLOBMSG_TYPE_INT32
 841         };
 842
 843         blobmsg_parse(&checkup_policy, 1, &tb, blob_data(attr), blob_len(attr));
 844         if (!tb) {
 845                 state->checkup_interval = -1;
 846                 state->checkup_timeout.cb = NULL;
 847         } else {
 848                 state->checkup_interval = blobmsg_get_u32(tb);
 849                 state->checkup_timeout.cb = proto_shell_checkup_timeout_cb;
 850         }
 851 }
 852
 853 static struct interface_proto_state *
 854 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 855                    struct blob_attr *attr)
 856 {
 857         struct proto_shell_state *state;
 858
 859         state = calloc(1, sizeof(*state));
 860         if (!state)
 861                 return NULL;
 862
 863         INIT_LIST_HEAD(&state->deps);
 864
 865         state->config = malloc(blob_pad_len(attr));
 866         if (!state->config)
 867                 goto error;
 868
 869         memcpy(state->config, attr, blob_pad_len(attr));
 870         proto_shell_checkup_attach(state, state->config);
 871         state->proto.free = proto_shell_free;
 872         state->proto.notify = proto_shell_notify;
 873         state->proto.cb = proto_shell_handler;
 874         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 875         state->script_task.cb = proto_shell_script_cb;
 876         state->script_task.dir_fd = proto_fd;
 877         state->script_task.log_prefix = iface->name;
 878         state->proto_task.cb = proto_shell_task_cb;
 879         state->proto_task.dir_fd = proto_fd;
 880         state->proto_task.log_prefix = iface->name;
 881         state->handler = container_of(h, struct proto_shell_handler, proto);
 882
 883         return &state->proto;
 884
 885 error:
 886         free(state);
 887         return NULL;
 888 }
 889
 890 static void
 891 proto_shell_add_handler(const char *script, const char *name, json_object *obj)
 892 {
 893         struct proto_shell_handler *handler;
 894         struct proto_handler *proto;
 895         json_object *config, *tmp;
 896         char *proto_name, *script_name;
 897
 898         handler = calloc_a(sizeof(*handler),
 899                            &proto_name, strlen(name) + 1,
 900                            &script_name, strlen(script) + 1);
 901         if (!handler)
 902                 return;
 903
 904         handler->script_name = strcpy(script_name, script);
 905
 906         proto = &handler->proto;
 907         proto->name = strcpy(proto_name, name);
 908         proto->config_params = &handler->config;
 909         proto->attach = proto_shell_attach;
 910
 911         tmp = json_get_field(obj, "no-device", json_type_boolean);
 912         if (tmp && json_object_get_boolean(tmp))
 913                 handler->proto.flags |= PROTO_FLAG_NODEV;
 914
 915         tmp = json_get_field(obj, "no-proto-task", json_type_boolean);
 916         if (tmp && json_object_get_boolean(tmp))
 917                 handler->proto.flags |= PROTO_FLAG_NO_TASK;
 918
 919         tmp = json_get_field(obj, "available", json_type_boolean);
 920         if (tmp && json_object_get_boolean(tmp))
 921                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 922
 923         tmp = json_get_field(obj, "renew-handler", json_type_boolean);
 924         if (tmp && json_object_get_boolean(tmp))
 925                 handler->proto.flags |= PROTO_FLAG_RENEW_AVAILABLE;
 926
 927         tmp = json_get_field(obj, "lasterror", json_type_boolean);
 928         if (tmp && json_object_get_boolean(tmp))
 929                 handler->proto.flags |= PROTO_FLAG_LASTERROR;
 930
 931         tmp = json_get_field(obj, "teardown-on-l3-link-down", json_type_boolean);
 932         if (tmp && json_object_get_boolean(tmp))
 933                 handler->proto.flags |= PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN;
 934
 935         config = json_get_field(obj, "config", json_type_array);
 936         if (config)
 937                 handler->config_buf = netifd_handler_parse_config(&handler->config, config);
 938
 939         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 940         add_proto_handler(proto);
 941 }
 942
 943 void proto_shell_init(void)
 944 {
 945         proto_fd = netifd_open_subdir("proto");
 946         if (proto_fd < 0)
 947                 return;
 948
 949         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 950 }