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