proto-shell.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #define _GNU_SOURCE
  15
  16 #include <string.h>
  17 #include <stdlib.h>
  18 #include <stdio.h>
  19 #include <signal.h>
  20
  21 #include <arpa/inet.h>
  22 #include <netinet/in.h>
  23
  24
  25 #include "netifd.h"
  26 #include "interface.h"
  27 #include "interface-ip.h"
  28 #include "proto.h"
  29 #include "system.h"
  30 #include "handler.h"
  31
  32 static int proto_fd = -1;
  33
  34 enum proto_shell_sm {
  35         S_IDLE,
  36         S_SETUP,
  37         S_SETUP_ABORT,
  38         S_TEARDOWN,
  39 };
  40
  41 struct proto_shell_handler {
  42         struct list_head list;
  43         struct proto_handler proto;
  44         char *config_buf;
  45         char *script_name;
  46         bool init_available;
  47         bool no_proto_task;
  48
  49         struct uci_blob_param_list config;
  50 };
  51
  52 struct proto_shell_dependency {
  53         struct list_head list;
  54
  55         char *interface;
  56         struct proto_shell_state *proto;
  57         struct interface_user dep;
  58
  59         union if_addr host;
  60         bool v6;
  61 };
  62
  63 struct proto_shell_state {
  64         struct interface_proto_state proto;
  65         struct proto_shell_handler *handler;
  66         struct blob_attr *config;
  67
  68         struct uloop_timeout teardown_timeout;
  69
  70         struct netifd_process script_task;
  71         struct netifd_process proto_task;
  72
  73         enum proto_shell_sm sm;
  74         bool proto_task_killed;
  75         bool renew_pending;
  76
  77         int last_error;
  78
  79         struct list_head deps;
  80 };
  81
  82 static void
  83 proto_shell_check_dependencies(struct proto_shell_state *state)
  84 {
  85         struct proto_shell_dependency *dep;
  86         bool available = true;
  87
  88         list_for_each_entry(dep, &state->deps, list) {
  89                 if (dep->dep.iface)
  90                         continue;
  91
  92                 available = false;
  93                 break;
  94         }
  95
  96         interface_set_available(state->proto.iface, available);
  97 }
  98
  99 static void
 100 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 101                      enum interface_event ev);
 102 static void
 103 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 104                        enum interface_event ev);
 105
 106 static void
 107 proto_shell_update_host_dep(struct proto_shell_dependency *dep)
 108 {
 109         struct interface *iface = NULL;
 110
 111         if (dep->dep.iface)
 112                 goto out;
 113
 114         if (dep->interface[0])
 115                 iface = vlist_find(&interfaces, dep->interface, iface, node);
 116
 117         iface = interface_ip_add_target_route(&dep->host, dep->v6, iface);
 118         if (!iface)
 119                 goto out;
 120
 121         interface_remove_user(&dep->dep);
 122         dep->dep.cb = proto_shell_if_down_cb;
 123         interface_add_user(&dep->dep, iface);
 124
 125 out:
 126         proto_shell_check_dependencies(dep->proto);
 127 }
 128
 129 static void
 130 proto_shell_clear_host_dep(struct proto_shell_state *state)
 131 {
 132         struct proto_shell_dependency *dep, *tmp;
 133
 134         list_for_each_entry_safe(dep, tmp, &state->deps, list) {
 135                 interface_remove_user(&dep->dep);
 136                 list_del(&dep->list);
 137                 free(dep);
 138         }
 139 }
 140
 141 static int
 142 proto_shell_handler(struct interface_proto_state *proto,
 143                     enum interface_proto_cmd cmd, bool force)
 144 {
 145         struct proto_shell_state *state;
 146         struct proto_shell_handler *handler;
 147         struct netifd_process *proc;
 148         static char error_buf[32];
 149         const char *argv[7];
 150         char *envp[2];
 151         const char *action;
 152         char *config;
 153         int ret, i = 0, j = 0;
 154
 155         state = container_of(proto, struct proto_shell_state, proto);
 156         handler = state->handler;
 157         proc = &state->script_task;
 158
 159         if (cmd == PROTO_CMD_SETUP) {
 160                 switch (state->sm) {
 161                 case S_IDLE:
 162                         action = "setup";
 163                         state->last_error = -1;
 164                         proto_shell_clear_host_dep(state);
 165                         state->sm = S_SETUP;
 166                         break;
 167
 168                 case S_SETUP_ABORT:
 169                 case S_TEARDOWN:
 170                 case S_SETUP:
 171                         return 0;
 172
 173                 default:
 174                         return -1;
 175                 }
 176         } else if (cmd == PROTO_CMD_RENEW) {
 177                 if (!(handler->proto.flags & PROTO_FLAG_RENEW_AVAILABLE))
 178                         return 0;
 179
 180                 if (state->script_task.uloop.pending) {
 181                         state->renew_pending = true;
 182                         return 0;
 183                 }
 184
 185                 state->renew_pending = false;
 186                 action = "renew";
 187         } else {
 188                 switch (state->sm) {
 189                 case S_SETUP:
 190                         if (state->script_task.uloop.pending) {
 191                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 192                                 kill(state->script_task.uloop.pid, SIGTERM);
 193                                 if (state->proto_task.uloop.pending)
 194                                         kill(state->proto_task.uloop.pid, SIGTERM);
 195                                 state->renew_pending = false;
 196                                 state->sm = S_SETUP_ABORT;
 197                                 return 0;
 198                         }
 199                 /* fall through if no script task is running */
 200                 case S_IDLE:
 201                         action = "teardown";
 202                         state->renew_pending = false;
 203                         state->sm = S_TEARDOWN;
 204                         if (state->last_error >= 0) {
 205                                 snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 206                                 envp[j++] = error_buf;
 207                         }
 208                         uloop_timeout_set(&state->teardown_timeout, 5000);
 209                         break;
 210
 211                 case S_TEARDOWN:
 212                         return 0;
 213
 214                 default:
 215                         return -1;
 216                 }
 217         }
 218
 219         D(INTERFACE, "run %s for interface '%s'\n", action, proto->iface->name);
 220         config = blobmsg_format_json(state->config, true);
 221         if (!config)
 222                 return -1;
 223
 224         argv[i++] = handler->script_name;
 225         argv[i++] = handler->proto.name;
 226         argv[i++] = action;
 227         argv[i++] = proto->iface->name;
 228         argv[i++] = config;
 229         if (proto->iface->main_dev.dev)
 230                 argv[i++] = proto->iface->main_dev.dev->ifname;
 231         argv[i] = NULL;
 232         envp[j] = NULL;
 233
 234         ret = netifd_start_process(argv, envp, proc);
 235         free(config);
 236
 237         return ret;
 238 }
 239
 240 static void
 241 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 242                      enum interface_event ev)
 243 {
 244         struct proto_shell_dependency *pdep;
 245
 246         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 247                 return;
 248
 249         pdep = container_of(dep, struct proto_shell_dependency, dep);
 250         proto_shell_update_host_dep(pdep);
 251 }
 252
 253 static void
 254 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 255                        enum interface_event ev)
 256 {
 257         struct proto_shell_dependency *pdep;
 258         struct proto_shell_state *state;
 259
 260         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 261                 return;
 262
 263         pdep = container_of(dep, struct proto_shell_dependency, dep);
 264         interface_remove_user(dep);
 265         dep->cb = proto_shell_if_up_cb;
 266         interface_add_user(dep, NULL);
 267
 268         state = pdep->proto;
 269         if (state->sm == S_IDLE) {
 270                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 271                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 272         }
 273 }
 274
 275 static void
 276 proto_shell_task_finish(struct proto_shell_state *state,
 277                         struct netifd_process *task)
 278 {
 279         switch (state->sm) {
 280         case S_IDLE:
 281                 if (task == &state->proto_task)
 282                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 283                 /* fall through */
 284         case S_SETUP:
 285                 if (task == &state->proto_task)
 286                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 287                                             false);
 288                 else if (task == &state->script_task) {
 289                         if (state->renew_pending)
 290                                 proto_shell_handler(&state->proto,
 291                                                     PROTO_CMD_RENEW, false);
 292                         else if (!state->handler->no_proto_task &&
 293                                  !state->proto_task.uloop.pending &&
 294                                  state->sm == S_SETUP)
 295                                 proto_shell_handler(&state->proto,
 296                                                     PROTO_CMD_TEARDOWN,
 297                                                     false);
 298                 }
 299                 break;
 300
 301         case S_SETUP_ABORT:
 302                 if (state->script_task.uloop.pending ||
 303                     state->proto_task.uloop.pending)
 304                         break;
 305
 306                 uloop_timeout_cancel(&state->teardown_timeout);
 307                 state->sm = S_IDLE;
 308                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 309                 break;
 310
 311         case S_TEARDOWN:
 312                 if (state->script_task.uloop.pending)
 313                         break;
 314
 315                 if (state->proto_task.uloop.pending) {
 316                         if (!state->proto_task_killed)
 317                                 kill(state->proto_task.uloop.pid, SIGTERM);
 318                         break;
 319                 }
 320
 321                 uloop_timeout_cancel(&state->teardown_timeout);
 322                 state->sm = S_IDLE;
 323                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 324                 break;
 325         }
 326 }
 327
 328 static void
 329 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 330 {
 331         struct proto_shell_state *state;
 332
 333         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 334
 335         netifd_kill_process(&state->script_task);
 336         netifd_kill_process(&state->proto_task);
 337         proto_shell_task_finish(state, NULL);
 338 }
 339
 340 static void
 341 proto_shell_script_cb(struct netifd_process *p, int ret)
 342 {
 343         struct proto_shell_state *state;
 344
 345         state = container_of(p, struct proto_shell_state, script_task);
 346         proto_shell_task_finish(state, p);
 347 }
 348
 349 static void
 350 proto_shell_task_cb(struct netifd_process *p, int ret)
 351 {
 352         struct proto_shell_state *state;
 353
 354         state = container_of(p, struct proto_shell_state, proto_task);
 355
 356         if (state->sm == S_IDLE || state->sm == S_SETUP)
 357                 state->last_error = WEXITSTATUS(ret);
 358
 359         proto_shell_task_finish(state, p);
 360 }
 361
 362 static void
 363 proto_shell_free(struct interface_proto_state *proto)
 364 {
 365         struct proto_shell_state *state;
 366
 367         state = container_of(proto, struct proto_shell_state, proto);
 368         uloop_timeout_cancel(&state->teardown_timeout);
 369         proto_shell_clear_host_dep(state);
 370         netifd_kill_process(&state->script_task);
 371         netifd_kill_process(&state->proto_task);
 372         free(state->config);
 373         free(state);
 374 }
 375
 376 static void
 377 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 378                              bool v6)
 379 {
 380         struct blob_attr *cur;
 381         int rem;
 382
 383         blobmsg_for_each_attr(cur, attr, rem) {
 384                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 385                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 386                         continue;
 387                 }
 388
 389                 interface_ip_add_route(iface, cur, v6);
 390         }
 391 }
 392
 393 static void
 394 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 395 {
 396         struct blob_attr *cur;
 397         int rem;
 398
 399         blobmsg_for_each_attr(cur, attr, rem)
 400                 interface_add_data(iface, cur);
 401 }
 402
 403 static struct device *
 404 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 405 {
 406         struct device *dev;
 407         struct blob_buf b;
 408
 409         memset(&b, 0, sizeof(b));
 410         blob_buf_init(&b, 0);
 411         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 412         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 413         blob_buf_free(&b);
 414
 415         return dev;
 416 }
 417
 418 enum {
 419         NOTIFY_ACTION,
 420         NOTIFY_ERROR,
 421         NOTIFY_COMMAND,
 422         NOTIFY_ENV,
 423         NOTIFY_SIGNAL,
 424         NOTIFY_AVAILABLE,
 425         NOTIFY_LINK_UP,
 426         NOTIFY_IFNAME,
 427         NOTIFY_ADDR_EXT,
 428         NOTIFY_ROUTES,
 429         NOTIFY_ROUTES6,
 430         NOTIFY_TUNNEL,
 431         NOTIFY_DATA,
 432         NOTIFY_KEEP,
 433         NOTIFY_HOST,
 434         NOTIFY_DNS,
 435         NOTIFY_DNS_SEARCH,
 436         __NOTIFY_LAST
 437 };
 438
 439 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 440         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 441         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 442         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 443         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 444         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 445         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 446         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 447         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 448         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 449         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 450         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 451         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 452         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 453         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 454         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 455         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 456         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 457 };
 458
 459 static int
 460 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 461 {
 462         struct interface *iface = state->proto.iface;
 463         struct blob_attr *cur;
 464         struct device *dev;
 465         const char *devname;
 466         int dev_create = 1;
 467         bool addr_ext = false;
 468         bool keep = false;
 469         bool up;
 470
 471         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 472                 return UBUS_STATUS_PERMISSION_DENIED;
 473
 474         if (!tb[NOTIFY_LINK_UP])
 475                 return UBUS_STATUS_INVALID_ARGUMENT;
 476
 477         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 478         if (!up) {
 479                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 480                 return 0;
 481         }
 482
 483         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 484                 keep = blobmsg_get_bool(cur);
 485
 486         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 487                 addr_ext = blobmsg_get_bool(cur);
 488                 if (addr_ext)
 489                         dev_create = 2;
 490         }
 491
 492         if (iface->state != IFS_UP || !iface->l3_dev.dev)
 493                 keep = false;
 494
 495         if (!keep) {
 496                 dev = iface->main_dev.dev;
 497                 if (tb[NOTIFY_IFNAME]) {
 498                         keep = false;
 499                         devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 500                         if (tb[NOTIFY_TUNNEL])
 501                                 dev = proto_shell_create_tunnel(devname, tb[NOTIFY_TUNNEL]);
 502                         else
 503                                 dev = device_get(devname, dev_create);
 504                 }
 505
 506                 if (!dev)
 507                         return UBUS_STATUS_INVALID_ARGUMENT;
 508
 509                 interface_set_l3_dev(iface, dev);
 510                 if (device_claim(&iface->l3_dev) < 0)
 511                         return UBUS_STATUS_UNKNOWN_ERROR;
 512
 513                 device_set_present(dev, true);
 514
 515                 interface_update_start(iface);
 516         }
 517
 518         proto_apply_ip_settings(iface, data, addr_ext);
 519
 520         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 521                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 522
 523         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 524                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 525
 526         if ((cur = tb[NOTIFY_DNS]))
 527                 interface_add_dns_server_list(&iface->proto_ip, cur);
 528
 529         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 530                 interface_add_dns_search_list(&iface->proto_ip, cur);
 531
 532         if ((cur = tb[NOTIFY_DATA]))
 533                 proto_shell_parse_data(state->proto.iface, cur);
 534
 535         interface_update_complete(state->proto.iface);
 536
 537         if ((state->sm != S_SETUP_ABORT) && (state->sm != S_TEARDOWN)) {
 538                 if (!keep)
 539                         state->proto.proto_event(&state->proto, IFPEV_UP);
 540                 state->sm = S_IDLE;
 541         }
 542
 543         return 0;
 544 }
 545
 546 static bool
 547 fill_string_list(struct blob_attr *attr, char **argv, int max)
 548 {
 549         struct blob_attr *cur;
 550         int argc = 0;
 551         int rem;
 552
 553         if (!attr)
 554                 goto out;
 555
 556         blobmsg_for_each_attr(cur, attr, rem) {
 557                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 558                         return false;
 559
 560                 if (!blobmsg_check_attr(cur, NULL))
 561                         return false;
 562
 563                 argv[argc++] = blobmsg_data(cur);
 564                 if (argc == max - 1)
 565                         return false;
 566         }
 567
 568 out:
 569         argv[argc] = NULL;
 570         return true;
 571 }
 572
 573 static int
 574 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 575 {
 576         static char *argv[64];
 577         static char *env[32];
 578
 579         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 580                 return UBUS_STATUS_PERMISSION_DENIED;
 581
 582         if (!tb[NOTIFY_COMMAND])
 583                 goto error;
 584
 585         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 586                 goto error;
 587
 588         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 589                 goto error;
 590
 591         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 592
 593         return 0;
 594
 595 error:
 596         return UBUS_STATUS_INVALID_ARGUMENT;
 597 }
 598
 599 static int
 600 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 601 {
 602         unsigned int signal = ~0;
 603
 604         if (tb[NOTIFY_SIGNAL])
 605                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 606
 607         if (signal > 31)
 608                 signal = SIGTERM;
 609
 610         if (state->proto_task.uloop.pending) {
 611                 if (signal == SIGTERM || signal == SIGKILL)
 612                         state->proto_task_killed = true;
 613                 kill(state->proto_task.uloop.pid, signal);
 614         }
 615
 616         return 0;
 617 }
 618
 619 static int
 620 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 621 {
 622         struct blob_attr *cur;
 623         char *data[16];
 624         int n_data = 0;
 625         int rem;
 626
 627         if (!tb[NOTIFY_ERROR])
 628                 return UBUS_STATUS_INVALID_ARGUMENT;
 629
 630         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 631                 if (n_data + 1 == ARRAY_SIZE(data))
 632                         goto error;
 633
 634                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 635                         goto error;
 636
 637                 if (!blobmsg_check_attr(cur, NULL))
 638                         goto error;
 639
 640                 data[n_data++] = blobmsg_data(cur);
 641         }
 642
 643         if (!n_data)
 644                 goto error;
 645
 646         interface_add_error(state->proto.iface, state->handler->proto.name,
 647                         data[0], (const char **) &data[1], n_data - 1);
 648
 649         return 0;
 650
 651 error:
 652         return UBUS_STATUS_INVALID_ARGUMENT;
 653 }
 654
 655 static int
 656 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 657 {
 658         state->proto.iface->autostart = false;
 659         return 0;
 660 }
 661
 662 static int
 663 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 664 {
 665         if (!tb[NOTIFY_AVAILABLE])
 666                 return UBUS_STATUS_INVALID_ARGUMENT;
 667
 668         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 669         return 0;
 670 }
 671
 672 static int
 673 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 674 {
 675         struct proto_shell_dependency *dep;
 676         struct blob_attr *host = tb[NOTIFY_HOST];
 677         struct blob_attr *ifname_a = tb[NOTIFY_IFNAME];
 678         const char *ifname_str = ifname_a ? blobmsg_data(ifname_a) : "";
 679         char *ifname;
 680
 681         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 682                 return UBUS_STATUS_PERMISSION_DENIED;
 683
 684         if (!host)
 685                 return UBUS_STATUS_INVALID_ARGUMENT;
 686
 687         dep = calloc_a(sizeof(*dep), &ifname, strlen(ifname_str) + 1);
 688         if (inet_pton(AF_INET, blobmsg_data(host), &dep->host) < 1) {
 689                 if (inet_pton(AF_INET6, blobmsg_data(host), &dep->host) < 1) {
 690                         free(dep);
 691                         return UBUS_STATUS_INVALID_ARGUMENT;
 692                 } else {
 693                         dep->v6 = true;
 694                 }
 695         }
 696
 697         dep->proto = state;
 698         dep->interface = strcpy(ifname, ifname_str);
 699
 700         dep->dep.cb = proto_shell_if_up_cb;
 701         interface_add_user(&dep->dep, NULL);
 702         list_add(&dep->list, &state->deps);
 703         proto_shell_update_host_dep(dep);
 704         if (!dep->dep.iface)
 705                 return UBUS_STATUS_NOT_FOUND;
 706
 707         return 0;
 708 }
 709
 710 static int
 711 proto_shell_setup_failed(struct proto_shell_state *state)
 712 {
 713         int ret = 0;
 714
 715         switch (state->sm) {
 716         case S_IDLE:
 717                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 718                 /* fall through */
 719         case S_SETUP:
 720                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 721                 break;
 722         case S_SETUP_ABORT:
 723         case S_TEARDOWN:
 724         default:
 725                 ret = UBUS_STATUS_PERMISSION_DENIED;
 726                 break;
 727         }
 728         return ret;
 729 }
 730
 731 static int
 732 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 733 {
 734         struct proto_shell_state *state;
 735         struct blob_attr *tb[__NOTIFY_LAST];
 736
 737         state = container_of(proto, struct proto_shell_state, proto);
 738
 739         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 740         if (!tb[NOTIFY_ACTION])
 741                 return UBUS_STATUS_INVALID_ARGUMENT;
 742
 743         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 744         case 0:
 745                 return proto_shell_update_link(state, attr, tb);
 746         case 1:
 747                 return proto_shell_run_command(state, tb);
 748         case 2:
 749                 return proto_shell_kill_command(state, tb);
 750         case 3:
 751                 return proto_shell_notify_error(state, tb);
 752         case 4:
 753                 return proto_shell_block_restart(state, tb);
 754         case 5:
 755                 return proto_shell_set_available(state, tb);
 756         case 6:
 757                 return proto_shell_add_host_dependency(state, tb);
 758         case 7:
 759                 return proto_shell_setup_failed(state);
 760         default:
 761                 return UBUS_STATUS_INVALID_ARGUMENT;
 762         }
 763 }
 764
 765 static struct interface_proto_state *
 766 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 767                    struct blob_attr *attr)
 768 {
 769         struct proto_shell_state *state;
 770
 771         state = calloc(1, sizeof(*state));
 772         INIT_LIST_HEAD(&state->deps);
 773
 774         state->config = malloc(blob_pad_len(attr));
 775         if (!state->config)
 776                 goto error;
 777
 778         memcpy(state->config, attr, blob_pad_len(attr));
 779         state->proto.free = proto_shell_free;
 780         state->proto.notify = proto_shell_notify;
 781         state->proto.cb = proto_shell_handler;
 782         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 783         state->script_task.cb = proto_shell_script_cb;
 784         state->script_task.dir_fd = proto_fd;
 785         state->script_task.log_prefix = iface->name;
 786         state->proto_task.cb = proto_shell_task_cb;
 787         state->proto_task.dir_fd = proto_fd;
 788         state->proto_task.log_prefix = iface->name;
 789         state->handler = container_of(h, struct proto_shell_handler, proto);
 790
 791         return &state->proto;
 792
 793 error:
 794         free(state);
 795         return NULL;
 796 }
 797
 798 static void
 799 proto_shell_add_handler(const char *script, const char *name, json_object *obj)
 800 {
 801         struct proto_shell_handler *handler;
 802         struct proto_handler *proto;
 803         json_object *config, *tmp;
 804         char *proto_name, *script_name;
 805
 806         handler = calloc_a(sizeof(*handler),
 807                            &proto_name, strlen(name) + 1,
 808                            &script_name, strlen(script) + 1);
 809         if (!handler)
 810                 return;
 811
 812         handler->script_name = strcpy(script_name, script);
 813
 814         proto = &handler->proto;
 815         proto->name = strcpy(proto_name, name);
 816         proto->config_params = &handler->config;
 817         proto->attach = proto_shell_attach;
 818
 819         tmp = json_get_field(obj, "no-device", json_type_boolean);
 820         if (tmp && json_object_get_boolean(tmp))
 821                 handler->proto.flags |= PROTO_FLAG_NODEV;
 822
 823         tmp = json_get_field(obj, "no-proto-task", json_type_boolean);
 824         handler->no_proto_task = tmp && json_object_get_boolean(tmp);
 825
 826         tmp = json_get_field(obj, "available", json_type_boolean);
 827         if (tmp && json_object_get_boolean(tmp))
 828                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 829
 830         tmp = json_get_field(obj, "renew-handler", json_type_boolean);
 831         if (tmp && json_object_get_boolean(tmp))
 832                 handler->proto.flags |= PROTO_FLAG_RENEW_AVAILABLE;
 833
 834         tmp = json_get_field(obj, "lasterror", json_type_boolean);
 835         if (tmp && json_object_get_boolean(tmp))
 836                 handler->proto.flags |= PROTO_FLAG_LASTERROR;
 837
 838         config = json_get_field(obj, "config", json_type_array);
 839         if (config)
 840                 handler->config_buf = netifd_handler_parse_config(&handler->config, config);
 841
 842         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 843         add_proto_handler(proto);
 844 }
 845
 846 void proto_shell_init(void)
 847 {
 848         proto_fd = netifd_open_subdir("proto");
 849         if (proto_fd < 0)
 850                 return;
 851
 852         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 853 }