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) {
 288                         if (state->renew_pending)
 289                                 proto_shell_handler(&state->proto,
 290                                                     PROTO_CMD_RENEW, false);
 291                         else if (!state->proto_task.uloop.pending &&
 292                                  state->sm == S_SETUP)
 293                                 proto_shell_handler(&state->proto,
 294                                                     PROTO_CMD_TEARDOWN,
 295                                                     false);
 296                 }
 297                 break;
 298
 299         case S_SETUP_ABORT:
 300                 if (state->script_task.uloop.pending ||
 301                     state->proto_task.uloop.pending)
 302                         break;
 303
 304                 uloop_timeout_cancel(&state->teardown_timeout);
 305                 state->sm = S_IDLE;
 306                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 307                 break;
 308
 309         case S_TEARDOWN:
 310                 if (state->script_task.uloop.pending)
 311                         break;
 312
 313                 if (state->proto_task.uloop.pending) {
 314                         if (!state->proto_task_killed)
 315                                 kill(state->proto_task.uloop.pid, SIGTERM);
 316                         break;
 317                 }
 318
 319                 uloop_timeout_cancel(&state->teardown_timeout);
 320                 state->sm = S_IDLE;
 321                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 322                 break;
 323         }
 324 }
 325
 326 static void
 327 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 328 {
 329         struct proto_shell_state *state;
 330
 331         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 332
 333         netifd_kill_process(&state->script_task);
 334         netifd_kill_process(&state->proto_task);
 335         proto_shell_task_finish(state, NULL);
 336 }
 337
 338 static void
 339 proto_shell_script_cb(struct netifd_process *p, int ret)
 340 {
 341         struct proto_shell_state *state;
 342
 343         state = container_of(p, struct proto_shell_state, script_task);
 344         proto_shell_task_finish(state, p);
 345 }
 346
 347 static void
 348 proto_shell_task_cb(struct netifd_process *p, int ret)
 349 {
 350         struct proto_shell_state *state;
 351
 352         state = container_of(p, struct proto_shell_state, proto_task);
 353
 354         if (state->sm == S_IDLE || state->sm == S_SETUP)
 355                 state->last_error = WEXITSTATUS(ret);
 356
 357         proto_shell_task_finish(state, p);
 358 }
 359
 360 static void
 361 proto_shell_free(struct interface_proto_state *proto)
 362 {
 363         struct proto_shell_state *state;
 364
 365         state = container_of(proto, struct proto_shell_state, proto);
 366         uloop_timeout_cancel(&state->teardown_timeout);
 367         proto_shell_clear_host_dep(state);
 368         netifd_kill_process(&state->script_task);
 369         netifd_kill_process(&state->proto_task);
 370         free(state->config);
 371         free(state);
 372 }
 373
 374 static void
 375 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 376                              bool v6)
 377 {
 378         struct blob_attr *cur;
 379         int rem;
 380
 381         blobmsg_for_each_attr(cur, attr, rem) {
 382                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 383                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 384                         continue;
 385                 }
 386
 387                 interface_ip_add_route(iface, cur, v6);
 388         }
 389 }
 390
 391 static void
 392 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 393 {
 394         struct blob_attr *cur;
 395         int rem;
 396
 397         blobmsg_for_each_attr(cur, attr, rem)
 398                 interface_add_data(iface, cur);
 399 }
 400
 401 static struct device *
 402 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 403 {
 404         struct device *dev;
 405         struct blob_buf b;
 406
 407         memset(&b, 0, sizeof(b));
 408         blob_buf_init(&b, 0);
 409         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 410         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 411         blob_buf_free(&b);
 412
 413         return dev;
 414 }
 415
 416 enum {
 417         NOTIFY_ACTION,
 418         NOTIFY_ERROR,
 419         NOTIFY_COMMAND,
 420         NOTIFY_ENV,
 421         NOTIFY_SIGNAL,
 422         NOTIFY_AVAILABLE,
 423         NOTIFY_LINK_UP,
 424         NOTIFY_IFNAME,
 425         NOTIFY_ADDR_EXT,
 426         NOTIFY_ROUTES,
 427         NOTIFY_ROUTES6,
 428         NOTIFY_TUNNEL,
 429         NOTIFY_DATA,
 430         NOTIFY_KEEP,
 431         NOTIFY_HOST,
 432         NOTIFY_DNS,
 433         NOTIFY_DNS_SEARCH,
 434         __NOTIFY_LAST
 435 };
 436
 437 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 438         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 439         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 440         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 441         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 442         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 443         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 444         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 445         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 446         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 447         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 448         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 449         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 450         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 451         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 452         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 453         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 454         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 455 };
 456
 457 static int
 458 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 459 {
 460         struct interface *iface = state->proto.iface;
 461         struct blob_attr *cur;
 462         struct device *dev;
 463         const char *devname;
 464         int dev_create = 1;
 465         bool addr_ext = false;
 466         bool keep = false;
 467         bool up;
 468
 469         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 470                 return UBUS_STATUS_PERMISSION_DENIED;
 471
 472         if (!tb[NOTIFY_LINK_UP])
 473                 return UBUS_STATUS_INVALID_ARGUMENT;
 474
 475         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 476         if (!up) {
 477                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 478                 return 0;
 479         }
 480
 481         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 482                 keep = blobmsg_get_bool(cur);
 483
 484         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 485                 addr_ext = blobmsg_get_bool(cur);
 486                 if (addr_ext)
 487                         dev_create = 2;
 488         }
 489
 490         if (iface->state != IFS_UP || !iface->l3_dev.dev)
 491                 keep = false;
 492
 493         if (!keep) {
 494                 dev = iface->main_dev.dev;
 495                 if (tb[NOTIFY_IFNAME]) {
 496                         keep = false;
 497                         devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 498                         if (tb[NOTIFY_TUNNEL])
 499                                 dev = proto_shell_create_tunnel(devname, tb[NOTIFY_TUNNEL]);
 500                         else
 501                                 dev = device_get(devname, dev_create);
 502                 }
 503
 504                 if (!dev)
 505                         return UBUS_STATUS_INVALID_ARGUMENT;
 506
 507                 interface_set_l3_dev(iface, dev);
 508                 if (device_claim(&iface->l3_dev) < 0)
 509                         return UBUS_STATUS_UNKNOWN_ERROR;
 510
 511                 device_set_present(dev, true);
 512
 513                 interface_update_start(iface);
 514         }
 515
 516         proto_apply_ip_settings(iface, data, addr_ext);
 517
 518         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 519                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 520
 521         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 522                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 523
 524         if ((cur = tb[NOTIFY_DNS]))
 525                 interface_add_dns_server_list(&iface->proto_ip, cur);
 526
 527         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 528                 interface_add_dns_search_list(&iface->proto_ip, cur);
 529
 530         if ((cur = tb[NOTIFY_DATA]))
 531                 proto_shell_parse_data(state->proto.iface, cur);
 532
 533         interface_update_complete(state->proto.iface);
 534
 535         if ((state->sm != S_SETUP_ABORT) && (state->sm != S_TEARDOWN)) {
 536                 if (!keep)
 537                         state->proto.proto_event(&state->proto, IFPEV_UP);
 538                 state->sm = S_IDLE;
 539         }
 540
 541         return 0;
 542 }
 543
 544 static bool
 545 fill_string_list(struct blob_attr *attr, char **argv, int max)
 546 {
 547         struct blob_attr *cur;
 548         int argc = 0;
 549         int rem;
 550
 551         if (!attr)
 552                 goto out;
 553
 554         blobmsg_for_each_attr(cur, attr, rem) {
 555                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 556                         return false;
 557
 558                 if (!blobmsg_check_attr(cur, NULL))
 559                         return false;
 560
 561                 argv[argc++] = blobmsg_data(cur);
 562                 if (argc == max - 1)
 563                         return false;
 564         }
 565
 566 out:
 567         argv[argc] = NULL;
 568         return true;
 569 }
 570
 571 static int
 572 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 573 {
 574         static char *argv[64];
 575         static char *env[32];
 576
 577         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 578                 return UBUS_STATUS_PERMISSION_DENIED;
 579
 580         if (!tb[NOTIFY_COMMAND])
 581                 goto error;
 582
 583         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 584                 goto error;
 585
 586         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 587                 goto error;
 588
 589         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 590
 591         return 0;
 592
 593 error:
 594         return UBUS_STATUS_INVALID_ARGUMENT;
 595 }
 596
 597 static int
 598 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 599 {
 600         unsigned int signal = ~0;
 601
 602         if (tb[NOTIFY_SIGNAL])
 603                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 604
 605         if (signal > 31)
 606                 signal = SIGTERM;
 607
 608         if (state->proto_task.uloop.pending) {
 609                 if (signal == SIGTERM || signal == SIGKILL)
 610                         state->proto_task_killed = true;
 611                 kill(state->proto_task.uloop.pid, signal);
 612         }
 613
 614         return 0;
 615 }
 616
 617 static int
 618 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 619 {
 620         struct blob_attr *cur;
 621         char *data[16];
 622         int n_data = 0;
 623         int rem;
 624
 625         if (!tb[NOTIFY_ERROR])
 626                 return UBUS_STATUS_INVALID_ARGUMENT;
 627
 628         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 629                 if (n_data + 1 == ARRAY_SIZE(data))
 630                         goto error;
 631
 632                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 633                         goto error;
 634
 635                 if (!blobmsg_check_attr(cur, NULL))
 636                         goto error;
 637
 638                 data[n_data++] = blobmsg_data(cur);
 639         }
 640
 641         if (!n_data)
 642                 goto error;
 643
 644         interface_add_error(state->proto.iface, state->handler->proto.name,
 645                         data[0], (const char **) &data[1], n_data - 1);
 646
 647         return 0;
 648
 649 error:
 650         return UBUS_STATUS_INVALID_ARGUMENT;
 651 }
 652
 653 static int
 654 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 655 {
 656         state->proto.iface->autostart = false;
 657         return 0;
 658 }
 659
 660 static int
 661 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 662 {
 663         if (!tb[NOTIFY_AVAILABLE])
 664                 return UBUS_STATUS_INVALID_ARGUMENT;
 665
 666         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 667         return 0;
 668 }
 669
 670 static int
 671 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 672 {
 673         struct proto_shell_dependency *dep;
 674         struct blob_attr *host = tb[NOTIFY_HOST];
 675         struct blob_attr *ifname_a = tb[NOTIFY_IFNAME];
 676         const char *ifname_str = ifname_a ? blobmsg_data(ifname_a) : "";
 677         char *ifname;
 678
 679         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 680                 return UBUS_STATUS_PERMISSION_DENIED;
 681
 682         if (!host)
 683                 return UBUS_STATUS_INVALID_ARGUMENT;
 684
 685         dep = calloc_a(sizeof(*dep), &ifname, strlen(ifname_str) + 1);
 686         if (inet_pton(AF_INET, blobmsg_data(host), &dep->host) < 1) {
 687                 if (inet_pton(AF_INET6, blobmsg_data(host), &dep->host) < 1) {
 688                         free(dep);
 689                         return UBUS_STATUS_INVALID_ARGUMENT;
 690                 } else {
 691                         dep->v6 = true;
 692                 }
 693         }
 694
 695         dep->proto = state;
 696         dep->interface = strcpy(ifname, ifname_str);
 697
 698         dep->dep.cb = proto_shell_if_up_cb;
 699         interface_add_user(&dep->dep, NULL);
 700         list_add(&dep->list, &state->deps);
 701         proto_shell_update_host_dep(dep);
 702         if (!dep->dep.iface)
 703                 return UBUS_STATUS_NOT_FOUND;
 704
 705         return 0;
 706 }
 707
 708 static int
 709 proto_shell_setup_failed(struct proto_shell_state *state)
 710 {
 711         int ret = 0;
 712
 713         switch (state->sm) {
 714         case S_IDLE:
 715                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 716                 /* fall through */
 717         case S_SETUP:
 718                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 719                 break;
 720         case S_SETUP_ABORT:
 721         case S_TEARDOWN:
 722         default:
 723                 ret = UBUS_STATUS_PERMISSION_DENIED;
 724                 break;
 725         }
 726         return ret;
 727 }
 728
 729 static int
 730 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 731 {
 732         struct proto_shell_state *state;
 733         struct blob_attr *tb[__NOTIFY_LAST];
 734
 735         state = container_of(proto, struct proto_shell_state, proto);
 736
 737         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 738         if (!tb[NOTIFY_ACTION])
 739                 return UBUS_STATUS_INVALID_ARGUMENT;
 740
 741         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 742         case 0:
 743                 return proto_shell_update_link(state, attr, tb);
 744         case 1:
 745                 return proto_shell_run_command(state, tb);
 746         case 2:
 747                 return proto_shell_kill_command(state, tb);
 748         case 3:
 749                 return proto_shell_notify_error(state, tb);
 750         case 4:
 751                 return proto_shell_block_restart(state, tb);
 752         case 5:
 753                 return proto_shell_set_available(state, tb);
 754         case 6:
 755                 return proto_shell_add_host_dependency(state, tb);
 756         case 7:
 757                 return proto_shell_setup_failed(state);
 758         default:
 759                 return UBUS_STATUS_INVALID_ARGUMENT;
 760         }
 761 }
 762
 763 static struct interface_proto_state *
 764 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 765                    struct blob_attr *attr)
 766 {
 767         struct proto_shell_state *state;
 768
 769         state = calloc(1, sizeof(*state));
 770         INIT_LIST_HEAD(&state->deps);
 771
 772         state->config = malloc(blob_pad_len(attr));
 773         if (!state->config)
 774                 goto error;
 775
 776         memcpy(state->config, attr, blob_pad_len(attr));
 777         state->proto.free = proto_shell_free;
 778         state->proto.notify = proto_shell_notify;
 779         state->proto.cb = proto_shell_handler;
 780         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 781         state->script_task.cb = proto_shell_script_cb;
 782         state->script_task.dir_fd = proto_fd;
 783         state->script_task.log_prefix = iface->name;
 784         state->proto_task.cb = proto_shell_task_cb;
 785         state->proto_task.dir_fd = proto_fd;
 786         state->proto_task.log_prefix = iface->name;
 787         state->handler = container_of(h, struct proto_shell_handler, proto);
 788
 789         return &state->proto;
 790
 791 error:
 792         free(state);
 793         return NULL;
 794 }
 795
 796 static void
 797 proto_shell_add_handler(const char *script, const char *name, json_object *obj)
 798 {
 799         struct proto_shell_handler *handler;
 800         struct proto_handler *proto;
 801         json_object *config, *tmp;
 802         char *proto_name, *script_name;
 803
 804         handler = calloc_a(sizeof(*handler),
 805                            &proto_name, strlen(name) + 1,
 806                            &script_name, strlen(script) + 1);
 807         if (!handler)
 808                 return;
 809
 810         handler->script_name = strcpy(script_name, script);
 811
 812         proto = &handler->proto;
 813         proto->name = strcpy(proto_name, name);
 814         proto->config_params = &handler->config;
 815         proto->attach = proto_shell_attach;
 816
 817         tmp = json_get_field(obj, "no-device", json_type_boolean);
 818         if (tmp && json_object_get_boolean(tmp))
 819                 handler->proto.flags |= PROTO_FLAG_NODEV;
 820
 821         tmp = json_get_field(obj, "available", json_type_boolean);
 822         if (tmp && json_object_get_boolean(tmp))
 823                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 824
 825         tmp = json_get_field(obj, "renew-handler", json_type_boolean);
 826         if (tmp && json_object_get_boolean(tmp))
 827                 handler->proto.flags |= PROTO_FLAG_RENEW_AVAILABLE;
 828
 829         tmp = json_get_field(obj, "lasterror", json_type_boolean);
 830         if (tmp && json_object_get_boolean(tmp))
 831                 handler->proto.flags |= PROTO_FLAG_LASTERROR;
 832
 833         config = json_get_field(obj, "config", json_type_array);
 834         if (config)
 835                 handler->config_buf = netifd_handler_parse_config(&handler->config, config);
 836
 837         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 838         add_proto_handler(proto);
 839 }
 840
 841 void proto_shell_init(void)
 842 {
 843         proto_fd = netifd_open_subdir("proto");
 844         if (proto_fd < 0)
 845                 return;
 846
 847         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 848 }