proto-shell.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #define _GNU_SOURCE
  15
  16 #include <string.h>
  17 #include <stdlib.h>
  18 #include <stdio.h>
  19 #include <signal.h>
  20
  21 #include <arpa/inet.h>
  22 #include <netinet/in.h>
  23
  24
  25 #include "netifd.h"
  26 #include "interface.h"
  27 #include "interface-ip.h"
  28 #include "proto.h"
  29 #include "system.h"
  30 #include "handler.h"
  31
  32 static int proto_fd = -1;
  33
  34 enum proto_shell_sm {
  35         S_IDLE,
  36         S_SETUP,
  37         S_SETUP_ABORT,
  38         S_TEARDOWN,
  39 };
  40
  41 struct proto_shell_handler {
  42         struct list_head list;
  43         struct proto_handler proto;
  44         char *config_buf;
  45         char *script_name;
  46         bool init_available;
  47         bool no_proto_task;
  48
  49         struct uci_blob_param_list config;
  50 };
  51
  52 struct proto_shell_dependency {
  53         struct list_head list;
  54
  55         struct proto_shell_state *proto;
  56         struct interface_user dep;
  57
  58         union if_addr host;
  59         bool v6;
  60         bool any;
  61
  62         char interface[];
  63 };
  64
  65 struct proto_shell_state {
  66         struct interface_proto_state proto;
  67         struct proto_shell_handler *handler;
  68         struct blob_attr *config;
  69
  70         struct uloop_timeout teardown_timeout;
  71
  72         /*
  73          * Teardown and setup interface again if it is still not up (IFS_UP)
  74          * after checkup_interval seconds since previous attempt.  This check
  75          * will be disabled when the config option "checkup_interval" is
  76          * missing or has a negative value
  77          */
  78         int checkup_interval;
  79         struct uloop_timeout checkup_timeout;
  80
  81         struct netifd_process script_task;
  82         struct netifd_process proto_task;
  83
  84         enum proto_shell_sm sm;
  85         bool proto_task_killed;
  86         bool renew_pending;
  87
  88         int last_error;
  89
  90         struct list_head deps;
  91 };
  92
  93 static void
  94 proto_shell_check_dependencies(struct proto_shell_state *state)
  95 {
  96         struct proto_shell_dependency *dep;
  97         bool available = true;
  98
  99         list_for_each_entry(dep, &state->deps, list) {
 100                 if (dep->dep.iface)
 101                         continue;
 102
 103                 available = false;
 104                 break;
 105         }
 106
 107         interface_set_available(state->proto.iface, available);
 108 }
 109
 110 static void
 111 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 112                      enum interface_event ev);
 113 static void
 114 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 115                        enum interface_event ev);
 116
 117 static void
 118 proto_shell_update_host_dep(struct proto_shell_dependency *dep)
 119 {
 120         struct interface *iface = NULL;
 121
 122         if (dep->dep.iface)
 123                 goto out;
 124
 125         if (dep->interface[0]) {
 126                 iface = vlist_find(&interfaces, dep->interface, iface, node);
 127
 128                 if (!iface || iface->state != IFS_UP)
 129                         goto out;
 130         }
 131
 132         if (!dep->any)
 133                 iface = interface_ip_add_target_route(&dep->host, dep->v6, iface);
 134
 135         if (!iface)
 136                 goto out;
 137
 138         interface_remove_user(&dep->dep);
 139         dep->dep.cb = proto_shell_if_down_cb;
 140         interface_add_user(&dep->dep, iface);
 141
 142 out:
 143         proto_shell_check_dependencies(dep->proto);
 144 }
 145
 146 static void
 147 proto_shell_clear_host_dep(struct proto_shell_state *state)
 148 {
 149         struct proto_shell_dependency *dep, *tmp;
 150
 151         list_for_each_entry_safe(dep, tmp, &state->deps, list) {
 152                 interface_remove_user(&dep->dep);
 153                 list_del(&dep->list);
 154                 free(dep);
 155         }
 156 }
 157
 158 static int
 159 proto_shell_handler(struct interface_proto_state *proto,
 160                     enum interface_proto_cmd cmd, bool force)
 161 {
 162         struct proto_shell_state *state;
 163         struct proto_shell_handler *handler;
 164         struct netifd_process *proc;
 165         static char error_buf[32];
 166         const char *argv[7];
 167         char *envp[2];
 168         const char *action;
 169         char *config;
 170         int ret, i = 0, j = 0;
 171
 172         state = container_of(proto, struct proto_shell_state, proto);
 173         handler = state->handler;
 174         proc = &state->script_task;
 175
 176         if (cmd == PROTO_CMD_SETUP) {
 177                 switch (state->sm) {
 178                 case S_IDLE:
 179                         action = "setup";
 180                         state->last_error = -1;
 181                         proto_shell_clear_host_dep(state);
 182                         state->sm = S_SETUP;
 183                         break;
 184
 185                 case S_SETUP_ABORT:
 186                 case S_TEARDOWN:
 187                 case S_SETUP:
 188                         return 0;
 189
 190                 default:
 191                         return -1;
 192                 }
 193         } else if (cmd == PROTO_CMD_RENEW) {
 194                 if (!(handler->proto.flags & PROTO_FLAG_RENEW_AVAILABLE))
 195                         return 0;
 196
 197                 if (state->script_task.uloop.pending) {
 198                         state->renew_pending = true;
 199                         return 0;
 200                 }
 201
 202                 state->renew_pending = false;
 203                 action = "renew";
 204         } else {
 205                 switch (state->sm) {
 206                 case S_SETUP:
 207                         if (state->script_task.uloop.pending) {
 208                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 209                                 kill(state->script_task.uloop.pid, SIGTERM);
 210                                 if (state->proto_task.uloop.pending)
 211                                         kill(state->proto_task.uloop.pid, SIGTERM);
 212                                 state->renew_pending = false;
 213                                 state->sm = S_SETUP_ABORT;
 214                                 return 0;
 215                         }
 216                 /* fall through if no script task is running */
 217                 case S_IDLE:
 218                         action = "teardown";
 219                         state->renew_pending = false;
 220                         state->sm = S_TEARDOWN;
 221                         if (state->last_error >= 0) {
 222                                 snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 223                                 envp[j++] = error_buf;
 224                         }
 225                         uloop_timeout_set(&state->teardown_timeout, 5000);
 226                         break;
 227
 228                 case S_TEARDOWN:
 229                         return 0;
 230
 231                 default:
 232                         return -1;
 233                 }
 234         }
 235
 236         D(INTERFACE, "run %s for interface '%s'\n", action, proto->iface->name);
 237         config = blobmsg_format_json(state->config, true);
 238         if (!config)
 239                 return -1;
 240
 241         argv[i++] = handler->script_name;
 242         argv[i++] = handler->proto.name;
 243         argv[i++] = action;
 244         argv[i++] = proto->iface->name;
 245         argv[i++] = config;
 246         if (proto->iface->main_dev.dev)
 247                 argv[i++] = proto->iface->main_dev.dev->ifname;
 248         argv[i] = NULL;
 249         envp[j] = NULL;
 250
 251         ret = netifd_start_process(argv, envp, proc);
 252         free(config);
 253
 254         return ret;
 255 }
 256
 257 static void
 258 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 259                      enum interface_event ev)
 260 {
 261         struct proto_shell_dependency *pdep;
 262
 263         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 264                 return;
 265
 266         pdep = container_of(dep, struct proto_shell_dependency, dep);
 267         proto_shell_update_host_dep(pdep);
 268 }
 269
 270 static void
 271 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 272                        enum interface_event ev)
 273 {
 274         struct proto_shell_dependency *pdep;
 275         struct proto_shell_state *state;
 276
 277         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 278                 return;
 279
 280         pdep = container_of(dep, struct proto_shell_dependency, dep);
 281         interface_remove_user(dep);
 282         dep->cb = proto_shell_if_up_cb;
 283         interface_add_user(dep, NULL);
 284
 285         state = pdep->proto;
 286         if (state->sm == S_IDLE) {
 287                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 288                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 289         }
 290 }
 291
 292 static void
 293 proto_shell_task_finish(struct proto_shell_state *state,
 294                         struct netifd_process *task)
 295 {
 296         switch (state->sm) {
 297         case S_IDLE:
 298                 if (task == &state->proto_task)
 299                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 300                 /* fall through */
 301         case S_SETUP:
 302                 if (task == &state->proto_task)
 303                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 304                                             false);
 305                 else if (task == &state->script_task) {
 306                         if (state->renew_pending)
 307                                 proto_shell_handler(&state->proto,
 308                                                     PROTO_CMD_RENEW, false);
 309                         else if (!state->handler->no_proto_task &&
 310                                  !state->proto_task.uloop.pending &&
 311                                  state->sm == S_SETUP)
 312                                 proto_shell_handler(&state->proto,
 313                                                     PROTO_CMD_TEARDOWN,
 314                                                     false);
 315
 316                         /* check up status after setup attempt by this script_task */
 317                         if (state->sm == S_SETUP && state->checkup_interval > 0) {
 318                                 uloop_timeout_set(&state->checkup_timeout,
 319                                                   state->checkup_interval * 1000);
 320                         }
 321                 }
 322                 break;
 323
 324         case S_SETUP_ABORT:
 325                 if (state->script_task.uloop.pending ||
 326                     state->proto_task.uloop.pending)
 327                         break;
 328
 329                 /* completed aborting all tasks, now idle */
 330                 uloop_timeout_cancel(&state->teardown_timeout);
 331                 uloop_timeout_cancel(&state->checkup_timeout);
 332                 state->sm = S_IDLE;
 333                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 334                 break;
 335
 336         case S_TEARDOWN:
 337                 if (state->script_task.uloop.pending)
 338                         break;
 339
 340                 if (state->proto_task.uloop.pending) {
 341                         if (!state->proto_task_killed)
 342                                 kill(state->proto_task.uloop.pid, SIGTERM);
 343                         break;
 344                 }
 345
 346                 /* completed tearing down all tasks, now idle */
 347                 uloop_timeout_cancel(&state->teardown_timeout);
 348                 uloop_timeout_cancel(&state->checkup_timeout);
 349                 state->sm = S_IDLE;
 350                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 351                 break;
 352         }
 353 }
 354
 355 static void
 356 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 357 {
 358         struct proto_shell_state *state;
 359
 360         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 361
 362         netifd_kill_process(&state->script_task);
 363         netifd_kill_process(&state->proto_task);
 364         proto_shell_task_finish(state, NULL);
 365 }
 366
 367 static void
 368 proto_shell_script_cb(struct netifd_process *p, int ret)
 369 {
 370         struct proto_shell_state *state;
 371
 372         state = container_of(p, struct proto_shell_state, script_task);
 373         proto_shell_task_finish(state, p);
 374 }
 375
 376 static void
 377 proto_shell_task_cb(struct netifd_process *p, int ret)
 378 {
 379         struct proto_shell_state *state;
 380
 381         state = container_of(p, struct proto_shell_state, proto_task);
 382
 383         if (state->sm == S_IDLE || state->sm == S_SETUP)
 384                 state->last_error = WEXITSTATUS(ret);
 385
 386         proto_shell_task_finish(state, p);
 387 }
 388
 389 static void
 390 proto_shell_free(struct interface_proto_state *proto)
 391 {
 392         struct proto_shell_state *state;
 393
 394         state = container_of(proto, struct proto_shell_state, proto);
 395         uloop_timeout_cancel(&state->teardown_timeout);
 396         uloop_timeout_cancel(&state->checkup_timeout);
 397         proto_shell_clear_host_dep(state);
 398         netifd_kill_process(&state->script_task);
 399         netifd_kill_process(&state->proto_task);
 400         free(state->config);
 401         free(state);
 402 }
 403
 404 static void
 405 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 406                              bool v6)
 407 {
 408         struct blob_attr *cur;
 409         int rem;
 410
 411         blobmsg_for_each_attr(cur, attr, rem) {
 412                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 413                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 414                         continue;
 415                 }
 416
 417                 interface_ip_add_route(iface, cur, v6);
 418         }
 419 }
 420
 421 static void
 422 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 423 {
 424         struct blob_attr *cur;
 425         int rem;
 426
 427         blobmsg_for_each_attr(cur, attr, rem)
 428                 interface_add_data(iface, cur);
 429 }
 430
 431 static struct device *
 432 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 433 {
 434         struct device *dev;
 435         struct blob_buf b;
 436
 437         memset(&b, 0, sizeof(b));
 438         blob_buf_init(&b, 0);
 439         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 440         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 441         blob_buf_free(&b);
 442
 443         return dev;
 444 }
 445
 446 enum {
 447         NOTIFY_ACTION,
 448         NOTIFY_ERROR,
 449         NOTIFY_COMMAND,
 450         NOTIFY_ENV,
 451         NOTIFY_SIGNAL,
 452         NOTIFY_AVAILABLE,
 453         NOTIFY_LINK_UP,
 454         NOTIFY_IFNAME,
 455         NOTIFY_ADDR_EXT,
 456         NOTIFY_ROUTES,
 457         NOTIFY_ROUTES6,
 458         NOTIFY_TUNNEL,
 459         NOTIFY_DATA,
 460         NOTIFY_KEEP,
 461         NOTIFY_HOST,
 462         NOTIFY_DNS,
 463         NOTIFY_DNS_SEARCH,
 464         __NOTIFY_LAST
 465 };
 466
 467 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 468         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 469         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 470         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 471         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 472         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 473         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 474         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 475         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 476         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 477         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 478         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 479         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 480         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 481         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 482         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 483         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 484         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 485 };
 486
 487 static int
 488 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 489 {
 490         struct interface *iface = state->proto.iface;
 491         struct blob_attr *cur;
 492         struct device *dev;
 493         const char *devname;
 494         int dev_create = 1;
 495         bool addr_ext = false;
 496         bool keep = false;
 497         bool up;
 498
 499         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 500                 return UBUS_STATUS_PERMISSION_DENIED;
 501
 502         if (!tb[NOTIFY_LINK_UP])
 503                 return UBUS_STATUS_INVALID_ARGUMENT;
 504
 505         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 506         if (!up) {
 507                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 508                 return 0;
 509         }
 510
 511         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 512                 keep = blobmsg_get_bool(cur);
 513
 514         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 515                 addr_ext = blobmsg_get_bool(cur);
 516                 if (addr_ext)
 517                         dev_create = 2;
 518         }
 519
 520         if (iface->state != IFS_UP || !iface->l3_dev.dev)
 521                 keep = false;
 522
 523         if (!keep) {
 524                 dev = iface->main_dev.dev;
 525                 if (tb[NOTIFY_IFNAME]) {
 526                         keep = false;
 527                         devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 528                         if (tb[NOTIFY_TUNNEL])
 529                                 dev = proto_shell_create_tunnel(devname, tb[NOTIFY_TUNNEL]);
 530                         else
 531                                 dev = device_get(devname, dev_create);
 532                 }
 533
 534                 if (!dev)
 535                         return UBUS_STATUS_INVALID_ARGUMENT;
 536
 537                 interface_set_l3_dev(iface, dev);
 538                 if (device_claim(&iface->l3_dev) < 0)
 539                         return UBUS_STATUS_UNKNOWN_ERROR;
 540
 541                 device_set_present(dev, true);
 542
 543                 interface_update_start(iface);
 544         }
 545
 546         proto_apply_ip_settings(iface, data, addr_ext);
 547
 548         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 549                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 550
 551         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 552                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 553
 554         if ((cur = tb[NOTIFY_DNS]))
 555                 interface_add_dns_server_list(&iface->proto_ip, cur);
 556
 557         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 558                 interface_add_dns_search_list(&iface->proto_ip, cur);
 559
 560         if ((cur = tb[NOTIFY_DATA]))
 561                 proto_shell_parse_data(state->proto.iface, cur);
 562
 563         interface_update_complete(state->proto.iface);
 564
 565         if ((state->sm != S_SETUP_ABORT) && (state->sm != S_TEARDOWN)) {
 566                 if (!keep)
 567                         state->proto.proto_event(&state->proto, IFPEV_UP);
 568                 state->sm = S_IDLE;
 569         }
 570
 571         return 0;
 572 }
 573
 574 static bool
 575 fill_string_list(struct blob_attr *attr, char **argv, int max)
 576 {
 577         struct blob_attr *cur;
 578         int argc = 0;
 579         int rem;
 580
 581         if (!attr)
 582                 goto out;
 583
 584         blobmsg_for_each_attr(cur, attr, rem) {
 585                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 586                         return false;
 587
 588                 if (!blobmsg_check_attr(cur, NULL))
 589                         return false;
 590
 591                 argv[argc++] = blobmsg_data(cur);
 592                 if (argc == max - 1)
 593                         return false;
 594         }
 595
 596 out:
 597         argv[argc] = NULL;
 598         return true;
 599 }
 600
 601 static int
 602 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 603 {
 604         static char *argv[64];
 605         static char *env[32];
 606
 607         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 608                 return UBUS_STATUS_PERMISSION_DENIED;
 609
 610         if (!tb[NOTIFY_COMMAND])
 611                 goto error;
 612
 613         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 614                 goto error;
 615
 616         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 617                 goto error;
 618
 619         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 620
 621         return 0;
 622
 623 error:
 624         return UBUS_STATUS_INVALID_ARGUMENT;
 625 }
 626
 627 static int
 628 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 629 {
 630         unsigned int signal = ~0;
 631
 632         if (tb[NOTIFY_SIGNAL])
 633                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 634
 635         if (signal > 31)
 636                 signal = SIGTERM;
 637
 638         if (state->proto_task.uloop.pending) {
 639                 if (signal == SIGTERM || signal == SIGKILL)
 640                         state->proto_task_killed = true;
 641                 kill(state->proto_task.uloop.pid, signal);
 642         }
 643
 644         return 0;
 645 }
 646
 647 static int
 648 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 649 {
 650         struct blob_attr *cur;
 651         char *data[16];
 652         int n_data = 0;
 653         int rem;
 654
 655         if (!tb[NOTIFY_ERROR])
 656                 return UBUS_STATUS_INVALID_ARGUMENT;
 657
 658         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 659                 if (n_data + 1 == ARRAY_SIZE(data))
 660                         goto error;
 661
 662                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 663                         goto error;
 664
 665                 if (!blobmsg_check_attr(cur, NULL))
 666                         goto error;
 667
 668                 data[n_data++] = blobmsg_data(cur);
 669         }
 670
 671         if (!n_data)
 672                 goto error;
 673
 674         interface_add_error(state->proto.iface, state->handler->proto.name,
 675                         data[0], (const char **) &data[1], n_data - 1);
 676
 677         return 0;
 678
 679 error:
 680         return UBUS_STATUS_INVALID_ARGUMENT;
 681 }
 682
 683 static int
 684 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 685 {
 686         state->proto.iface->autostart = false;
 687         return 0;
 688 }
 689
 690 static int
 691 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 692 {
 693         if (!tb[NOTIFY_AVAILABLE])
 694                 return UBUS_STATUS_INVALID_ARGUMENT;
 695
 696         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 697         return 0;
 698 }
 699
 700 static int
 701 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 702 {
 703         struct proto_shell_dependency *dep;
 704         const char *ifname = tb[NOTIFY_IFNAME] ? blobmsg_data(tb[NOTIFY_IFNAME]) : "";
 705         const char *host = tb[NOTIFY_HOST] ? blobmsg_data(tb[NOTIFY_HOST]) : "";
 706
 707         if (state->sm == S_TEARDOWN || state->sm == S_SETUP_ABORT)
 708                 return UBUS_STATUS_PERMISSION_DENIED;
 709
 710         dep = calloc(1, sizeof(*dep) + strlen(ifname) + 1);
 711         if (!dep)
 712                 return UBUS_STATUS_UNKNOWN_ERROR;
 713
 714         if (!host[0] && ifname[0]) {
 715                 dep->any = true;
 716         } else if (inet_pton(AF_INET, host, &dep->host) < 1) {
 717                 if (inet_pton(AF_INET6, host, &dep->host) < 1) {
 718                         free(dep);
 719                         return UBUS_STATUS_INVALID_ARGUMENT;
 720                 } else {
 721                         dep->v6 = true;
 722                 }
 723         }
 724
 725         dep->proto = state;
 726         strcpy(dep->interface, ifname);
 727
 728         dep->dep.cb = proto_shell_if_up_cb;
 729         interface_add_user(&dep->dep, NULL);
 730         list_add(&dep->list, &state->deps);
 731         proto_shell_update_host_dep(dep);
 732         if (!dep->dep.iface)
 733                 return UBUS_STATUS_NOT_FOUND;
 734
 735         return 0;
 736 }
 737
 738 static int
 739 proto_shell_setup_failed(struct proto_shell_state *state)
 740 {
 741         int ret = 0;
 742
 743         switch (state->sm) {
 744         case S_IDLE:
 745                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 746                 /* fall through */
 747         case S_SETUP:
 748                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 749                 break;
 750         case S_SETUP_ABORT:
 751         case S_TEARDOWN:
 752         default:
 753                 ret = UBUS_STATUS_PERMISSION_DENIED;
 754                 break;
 755         }
 756         return ret;
 757 }
 758
 759 static int
 760 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 761 {
 762         struct proto_shell_state *state;
 763         struct blob_attr *tb[__NOTIFY_LAST];
 764
 765         state = container_of(proto, struct proto_shell_state, proto);
 766
 767         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 768         if (!tb[NOTIFY_ACTION])
 769                 return UBUS_STATUS_INVALID_ARGUMENT;
 770
 771         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 772         case 0:
 773                 return proto_shell_update_link(state, attr, tb);
 774         case 1:
 775                 return proto_shell_run_command(state, tb);
 776         case 2:
 777                 return proto_shell_kill_command(state, tb);
 778         case 3:
 779                 return proto_shell_notify_error(state, tb);
 780         case 4:
 781                 return proto_shell_block_restart(state, tb);
 782         case 5:
 783                 return proto_shell_set_available(state, tb);
 784         case 6:
 785                 return proto_shell_add_host_dependency(state, tb);
 786         case 7:
 787                 return proto_shell_setup_failed(state);
 788         default:
 789                 return UBUS_STATUS_INVALID_ARGUMENT;
 790         }
 791 }
 792
 793 static void
 794 proto_shell_checkup_timeout_cb(struct uloop_timeout *timeout)
 795 {
 796         struct proto_shell_state *state = container_of(timeout, struct
 797                         proto_shell_state, checkup_timeout);
 798         struct interface_proto_state *proto = &state->proto;
 799         struct interface *iface = proto->iface;
 800
 801         if (!iface->autostart)
 802                 return;
 803
 804         if (iface->state == IFS_UP)
 805                 return;
 806
 807         D(INTERFACE, "Interface '%s' is not up after %d sec\n",
 808                         iface->name, state->checkup_interval);
 809         proto_shell_handler(proto, PROTO_CMD_TEARDOWN, false);
 810 }
 811
 812 static void
 813 proto_shell_checkup_attach(struct proto_shell_state *state,
 814                 const struct blob_attr *attr)
 815 {
 816         struct blob_attr *tb;
 817         struct blobmsg_policy checkup_policy = {
 818                 .name = "checkup_interval",
 819                 .type = BLOBMSG_TYPE_INT32
 820         };
 821
 822         blobmsg_parse(&checkup_policy, 1, &tb, blob_data(attr), blob_len(attr));
 823         if (!tb) {
 824                 state->checkup_interval = -1;
 825                 state->checkup_timeout.cb = NULL;
 826         } else {
 827                 state->checkup_interval = blobmsg_get_u32(tb);
 828                 state->checkup_timeout.cb = proto_shell_checkup_timeout_cb;
 829         }
 830 }
 831
 832 static struct interface_proto_state *
 833 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 834                    struct blob_attr *attr)
 835 {
 836         struct proto_shell_state *state;
 837
 838         state = calloc(1, sizeof(*state));
 839         if (!state)
 840                 return NULL;
 841
 842         INIT_LIST_HEAD(&state->deps);
 843
 844         state->config = malloc(blob_pad_len(attr));
 845         if (!state->config)
 846                 goto error;
 847
 848         memcpy(state->config, attr, blob_pad_len(attr));
 849         proto_shell_checkup_attach(state, state->config);
 850         state->proto.free = proto_shell_free;
 851         state->proto.notify = proto_shell_notify;
 852         state->proto.cb = proto_shell_handler;
 853         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 854         state->script_task.cb = proto_shell_script_cb;
 855         state->script_task.dir_fd = proto_fd;
 856         state->script_task.log_prefix = iface->name;
 857         state->proto_task.cb = proto_shell_task_cb;
 858         state->proto_task.dir_fd = proto_fd;
 859         state->proto_task.log_prefix = iface->name;
 860         state->handler = container_of(h, struct proto_shell_handler, proto);
 861
 862         return &state->proto;
 863
 864 error:
 865         free(state);
 866         return NULL;
 867 }
 868
 869 static void
 870 proto_shell_add_handler(const char *script, const char *name, json_object *obj)
 871 {
 872         struct proto_shell_handler *handler;
 873         struct proto_handler *proto;
 874         json_object *config, *tmp;
 875         char *proto_name, *script_name;
 876
 877         handler = calloc_a(sizeof(*handler),
 878                            &proto_name, strlen(name) + 1,
 879                            &script_name, strlen(script) + 1);
 880         if (!handler)
 881                 return;
 882
 883         handler->script_name = strcpy(script_name, script);
 884
 885         proto = &handler->proto;
 886         proto->name = strcpy(proto_name, name);
 887         proto->config_params = &handler->config;
 888         proto->attach = proto_shell_attach;
 889
 890         tmp = json_get_field(obj, "no-device", json_type_boolean);
 891         if (tmp && json_object_get_boolean(tmp))
 892                 handler->proto.flags |= PROTO_FLAG_NODEV;
 893
 894         tmp = json_get_field(obj, "no-proto-task", json_type_boolean);
 895         handler->no_proto_task = tmp && json_object_get_boolean(tmp);
 896
 897         tmp = json_get_field(obj, "available", json_type_boolean);
 898         if (tmp && json_object_get_boolean(tmp))
 899                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 900
 901         tmp = json_get_field(obj, "renew-handler", json_type_boolean);
 902         if (tmp && json_object_get_boolean(tmp))
 903                 handler->proto.flags |= PROTO_FLAG_RENEW_AVAILABLE;
 904
 905         tmp = json_get_field(obj, "lasterror", json_type_boolean);
 906         if (tmp && json_object_get_boolean(tmp))
 907                 handler->proto.flags |= PROTO_FLAG_LASTERROR;
 908
 909         tmp = json_get_field(obj, "teardown-on-l3-link-down", json_type_boolean);
 910         if (tmp && json_object_get_boolean(tmp))
 911                 handler->proto.flags |= PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN;
 912
 913         config = json_get_field(obj, "config", json_type_array);
 914         if (config)
 915                 handler->config_buf = netifd_handler_parse_config(&handler->config, config);
 916
 917         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 918         add_proto_handler(proto);
 919 }
 920
 921 void proto_shell_init(void)
 922 {
 923         proto_fd = netifd_open_subdir("proto");
 924         if (proto_fd < 0)
 925                 return;
 926
 927         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 928 }