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 <unistd.h>
  20 #include <signal.h>
  21
  22 #include <arpa/inet.h>
  23 #include <netinet/in.h>
  24
  25
  26 #include "netifd.h"
  27 #include "interface.h"
  28 #include "interface-ip.h"
  29 #include "proto.h"
  30 #include "system.h"
  31 #include "handler.h"
  32
  33 static int proto_fd = -1;
  34
  35 enum proto_shell_sm {
  36         S_IDLE,
  37         S_SETUP,
  38         S_SETUP_ABORT,
  39         S_TEARDOWN,
  40 };
  41
  42 struct proto_shell_handler {
  43         struct list_head list;
  44         struct proto_handler proto;
  45         struct uci_blob_param_list config;
  46         char *config_buf;
  47         bool init_available;
  48         char script_name[];
  49 };
  50
  51 struct proto_shell_dependency {
  52         struct list_head list;
  53
  54         struct proto_shell_state *proto;
  55         struct interface_user dep;
  56
  57         union if_addr host;
  58         bool v6;
  59
  60         char interface[];
  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
  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                 action = "setup";
 160                 state->last_error = -1;
 161                 proto_shell_clear_host_dep(state);
 162         } else {
 163                 if (state->sm == S_TEARDOWN)
 164                         return 0;
 165
 166                 if (state->script_task.uloop.pending) {
 167                         if (state->sm != S_SETUP_ABORT) {
 168                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 169                                 kill(state->script_task.uloop.pid, SIGTERM);
 170                                 if (state->proto_task.uloop.pending)
 171                                         kill(state->proto_task.uloop.pid, SIGTERM);
 172                                 state->sm = S_SETUP_ABORT;
 173                         }
 174                         return 0;
 175                 }
 176
 177                 action = "teardown";
 178                 state->sm = S_TEARDOWN;
 179                 if (state->last_error >= 0) {
 180                         snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 181                         envp[j++] = error_buf;
 182                 }
 183                 uloop_timeout_set(&state->teardown_timeout, 5000);
 184         }
 185
 186         config = blobmsg_format_json(state->config, true);
 187         if (!config)
 188                 return -1;
 189
 190         argv[i++] = handler->script_name;
 191         argv[i++] = handler->proto.name;
 192         argv[i++] = action;
 193         argv[i++] = proto->iface->name;
 194         argv[i++] = config;
 195         if (proto->iface->main_dev.dev)
 196                 argv[i++] = proto->iface->main_dev.dev->ifname;
 197         argv[i] = NULL;
 198         envp[j] = NULL;
 199
 200         ret = netifd_start_process(argv, envp, proc);
 201         free(config);
 202
 203         return ret;
 204 }
 205
 206 static void
 207 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 208                      enum interface_event ev)
 209 {
 210         struct proto_shell_dependency *pdep;
 211
 212         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 213                 return;
 214
 215         pdep = container_of(dep, struct proto_shell_dependency, dep);
 216         proto_shell_update_host_dep(pdep);
 217 }
 218
 219 static void
 220 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 221                        enum interface_event ev)
 222 {
 223         struct proto_shell_dependency *pdep;
 224         struct proto_shell_state *state;
 225
 226         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 227                 return;
 228
 229         pdep = container_of(dep, struct proto_shell_dependency, dep);
 230         interface_remove_user(dep);
 231         dep->cb = proto_shell_if_up_cb;
 232         interface_add_user(dep, NULL);
 233
 234         state = pdep->proto;
 235         if (state->sm == S_IDLE) {
 236                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 237                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 238         }
 239 }
 240
 241 static void
 242 proto_shell_task_finish(struct proto_shell_state *state,
 243                         struct netifd_process *task)
 244 {
 245         switch (state->sm) {
 246         case S_IDLE:
 247                 if (task == &state->proto_task)
 248                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 249                 /* fall through */
 250         case S_SETUP:
 251                 if (task == &state->proto_task)
 252                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 253                                             false);
 254                 break;
 255
 256         case S_SETUP_ABORT:
 257                 if (state->script_task.uloop.pending ||
 258                     state->proto_task.uloop.pending)
 259                         break;
 260
 261                 uloop_timeout_cancel(&state->teardown_timeout);
 262                 state->sm = S_IDLE;
 263                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 264                 break;
 265
 266         case S_TEARDOWN:
 267                 if (state->script_task.uloop.pending)
 268                         break;
 269
 270                 if (state->proto_task.uloop.pending) {
 271                         if (!state->proto_task_killed)
 272                                 kill(state->proto_task.uloop.pid, SIGTERM);
 273                         break;
 274                 }
 275
 276                 uloop_timeout_cancel(&state->teardown_timeout);
 277                 state->sm = S_IDLE;
 278                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 279                 break;
 280         }
 281 }
 282
 283 static void
 284 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 285 {
 286         struct proto_shell_state *state;
 287
 288         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 289
 290         netifd_kill_process(&state->script_task);
 291         netifd_kill_process(&state->proto_task);
 292         proto_shell_task_finish(state, NULL);
 293 }
 294
 295 static void
 296 proto_shell_script_cb(struct netifd_process *p, int ret)
 297 {
 298         struct proto_shell_state *state;
 299
 300         state = container_of(p, struct proto_shell_state, script_task);
 301         proto_shell_task_finish(state, p);
 302 }
 303
 304 static void
 305 proto_shell_task_cb(struct netifd_process *p, int ret)
 306 {
 307         struct proto_shell_state *state;
 308
 309         state = container_of(p, struct proto_shell_state, proto_task);
 310
 311         if (state->sm == S_IDLE || state->sm == S_SETUP)
 312                 state->last_error = WEXITSTATUS(ret);
 313
 314         proto_shell_task_finish(state, p);
 315 }
 316
 317 static void
 318 proto_shell_free(struct interface_proto_state *proto)
 319 {
 320         struct proto_shell_state *state;
 321
 322         state = container_of(proto, struct proto_shell_state, proto);
 323         uloop_timeout_cancel(&state->teardown_timeout);
 324         proto_shell_clear_host_dep(state);
 325         netifd_kill_process(&state->script_task);
 326         netifd_kill_process(&state->proto_task);
 327         free(state->config);
 328         free(state);
 329 }
 330
 331 static void
 332 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 333                              bool v6)
 334 {
 335         struct blob_attr *cur;
 336         int rem;
 337
 338         blobmsg_for_each_attr(cur, attr, rem) {
 339                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 340                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 341                         continue;
 342                 }
 343
 344                 interface_ip_add_route(iface, cur, v6);
 345         }
 346 }
 347
 348 static void
 349 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 350 {
 351         struct blob_attr *cur;
 352         int rem;
 353
 354         blobmsg_for_each_attr(cur, attr, rem)
 355                 interface_add_data(iface, cur);
 356 }
 357
 358 static struct device *
 359 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 360 {
 361         struct device *dev;
 362         struct blob_buf b;
 363
 364         memset(&b, 0, sizeof(b));
 365         blob_buf_init(&b, 0);
 366         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 367         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 368         blob_buf_free(&b);
 369
 370         return dev;
 371 }
 372
 373 enum {
 374         NOTIFY_ACTION,
 375         NOTIFY_ERROR,
 376         NOTIFY_COMMAND,
 377         NOTIFY_ENV,
 378         NOTIFY_SIGNAL,
 379         NOTIFY_AVAILABLE,
 380         NOTIFY_LINK_UP,
 381         NOTIFY_IFNAME,
 382         NOTIFY_ADDR_EXT,
 383         NOTIFY_ROUTES,
 384         NOTIFY_ROUTES6,
 385         NOTIFY_TUNNEL,
 386         NOTIFY_DATA,
 387         NOTIFY_KEEP,
 388         NOTIFY_HOST,
 389         NOTIFY_DNS,
 390         NOTIFY_DNS_SEARCH,
 391         __NOTIFY_LAST
 392 };
 393
 394 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 395         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 396         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 397         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 398         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 399         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 400         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 401         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 402         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 403         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 404         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 405         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 406         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 407         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 408         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 409         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 410         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 411         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 412 };
 413
 414 static int
 415 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 416 {
 417         struct interface *iface = state->proto.iface;
 418         struct blob_attr *cur;
 419         struct device *dev;
 420         const char *devname;
 421         int dev_create = 1;
 422         bool addr_ext = false;
 423         bool keep = false;
 424         bool up;
 425
 426         if (!tb[NOTIFY_LINK_UP])
 427                 return UBUS_STATUS_INVALID_ARGUMENT;
 428
 429         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 430         if (!up) {
 431                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 432                 return 0;
 433         }
 434
 435         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 436                 keep = blobmsg_get_bool(cur);
 437
 438         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 439                 addr_ext = blobmsg_get_bool(cur);
 440                 if (addr_ext)
 441                         dev_create = 2;
 442         }
 443
 444         if (!tb[NOTIFY_IFNAME]) {
 445                 if (!iface->main_dev.dev)
 446                         return UBUS_STATUS_INVALID_ARGUMENT;
 447         } else if (!keep || iface->state != IFS_UP) {
 448                 keep = false;
 449                 devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 450                 if (tb[NOTIFY_TUNNEL]) {
 451                         dev = proto_shell_create_tunnel(devname,
 452                                 tb[NOTIFY_TUNNEL]);
 453                         if (!dev)
 454                                 return UBUS_STATUS_INVALID_ARGUMENT;
 455                 } else {
 456                         dev = device_get(devname, dev_create);
 457                         if (!dev)
 458                                 return UBUS_STATUS_NOT_FOUND;
 459                 }
 460
 461                 interface_set_l3_dev(iface, dev);
 462                 device_claim(&iface->l3_dev);
 463                 device_set_present(dev, true);
 464         }
 465
 466         if (!keep)
 467                 interface_update_start(iface);
 468
 469         proto_apply_ip_settings(iface, data, addr_ext);
 470
 471         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 472                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 473
 474         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 475                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 476
 477         if ((cur = tb[NOTIFY_DNS]))
 478                 interface_add_dns_server_list(&iface->proto_ip, cur);
 479
 480         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 481                 interface_add_dns_search_list(&iface->proto_ip, cur);
 482
 483         interface_update_complete(state->proto.iface);
 484
 485         if (!keep)
 486                 state->proto.proto_event(&state->proto, IFPEV_UP);
 487         state->sm = S_IDLE;
 488
 489         if ((cur = tb[NOTIFY_DATA]))
 490                 proto_shell_parse_data(state->proto.iface, cur);
 491
 492         return 0;
 493 }
 494
 495 static bool
 496 fill_string_list(struct blob_attr *attr, char **argv, int max)
 497 {
 498         struct blob_attr *cur;
 499         int argc = 0;
 500         int rem;
 501
 502         if (!attr)
 503                 goto out;
 504
 505         blobmsg_for_each_attr(cur, attr, rem) {
 506                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 507                         return false;
 508
 509                 if (!blobmsg_check_attr(cur, NULL))
 510                         return false;
 511
 512                 argv[argc++] = blobmsg_data(cur);
 513                 if (argc == max - 1)
 514                         return false;
 515         }
 516
 517 out:
 518         argv[argc] = NULL;
 519         return true;
 520 }
 521
 522 static int
 523 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 524 {
 525         static char *argv[64];
 526         static char *env[32];
 527
 528         if (!tb[NOTIFY_COMMAND])
 529                 goto error;
 530
 531         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 532                 goto error;
 533
 534         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 535                 goto error;
 536
 537         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 538
 539         return 0;
 540
 541 error:
 542         return UBUS_STATUS_INVALID_ARGUMENT;
 543 }
 544
 545 static int
 546 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 547 {
 548         unsigned int signal = ~0;
 549
 550         if (tb[NOTIFY_SIGNAL])
 551                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 552
 553         if (signal > 31)
 554                 signal = SIGTERM;
 555
 556         if (state->proto_task.uloop.pending) {
 557                 state->proto_task_killed = true;
 558                 kill(state->proto_task.uloop.pid, signal);
 559         }
 560
 561         return 0;
 562 }
 563
 564 static int
 565 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 566 {
 567         struct blob_attr *cur;
 568         char *data[16];
 569         int n_data = 0;
 570         int rem;
 571
 572         if (!tb[NOTIFY_ERROR])
 573                 return UBUS_STATUS_INVALID_ARGUMENT;
 574
 575         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 576                 if (n_data + 1 == ARRAY_SIZE(data))
 577                         goto error;
 578
 579                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 580                         goto error;
 581
 582                 if (!blobmsg_check_attr(cur, NULL))
 583                         goto error;
 584
 585                 data[n_data++] = blobmsg_data(cur);
 586         }
 587
 588         if (!n_data)
 589                 goto error;
 590
 591         interface_add_error(state->proto.iface, state->handler->proto.name,
 592                         data[0], (const char **) &data[1], n_data - 1);
 593
 594         return 0;
 595
 596 error:
 597         return UBUS_STATUS_INVALID_ARGUMENT;
 598 }
 599
 600 static int
 601 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 602 {
 603         state->proto.iface->autostart = false;
 604         return 0;
 605 }
 606
 607 static int
 608 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 609 {
 610         if (!tb[NOTIFY_AVAILABLE])
 611                 return UBUS_STATUS_INVALID_ARGUMENT;
 612
 613         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 614         return 0;
 615 }
 616
 617 static int
 618 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 619 {
 620         struct proto_shell_dependency *dep;
 621         struct blob_attr *host = tb[NOTIFY_HOST];
 622         struct blob_attr *ifname = tb[NOTIFY_IFNAME];
 623         size_t ifnamelen = (ifname) ? blobmsg_data_len(ifname) : 1;
 624
 625         if (!host)
 626                 return UBUS_STATUS_INVALID_ARGUMENT;
 627
 628         dep = calloc(1, sizeof(*dep) + ifnamelen);
 629         if (inet_pton(AF_INET, blobmsg_data(host), &dep->host) < 1) {
 630                 if (inet_pton(AF_INET6, blobmsg_data(host), &dep->host) < 1) {
 631                         free(dep);
 632                         return UBUS_STATUS_INVALID_ARGUMENT;
 633                 } else {
 634                         dep->v6 = true;
 635                 }
 636         }
 637
 638         dep->proto = state;
 639         if (ifname)
 640                 memcpy(dep->interface, blobmsg_data(ifname), ifnamelen);
 641         else
 642                 dep->interface[0] = 0;
 643
 644         dep->dep.cb = proto_shell_if_up_cb;
 645         interface_add_user(&dep->dep, NULL);
 646         list_add(&dep->list, &state->deps);
 647         proto_shell_update_host_dep(dep);
 648         if (!dep->dep.iface)
 649                 return UBUS_STATUS_NOT_FOUND;
 650
 651         return 0;
 652 }
 653
 654 static int
 655 proto_shell_setup_failed(struct proto_shell_state *state)
 656 {
 657         switch (state->sm) {
 658         case S_IDLE:
 659                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 660                 /* fall through */
 661         case S_SETUP:
 662                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 663                 break;
 664         default:
 665                 break;
 666         }
 667         return 0;
 668 }
 669
 670 static int
 671 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 672 {
 673         struct proto_shell_state *state;
 674         struct blob_attr *tb[__NOTIFY_LAST];
 675
 676         state = container_of(proto, struct proto_shell_state, proto);
 677
 678         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 679         if (!tb[NOTIFY_ACTION])
 680                 return UBUS_STATUS_INVALID_ARGUMENT;
 681
 682         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 683         case 0:
 684                 return proto_shell_update_link(state, attr, tb);
 685         case 1:
 686                 return proto_shell_run_command(state, tb);
 687         case 2:
 688                 return proto_shell_kill_command(state, tb);
 689         case 3:
 690                 return proto_shell_notify_error(state, tb);
 691         case 4:
 692                 return proto_shell_block_restart(state, tb);
 693         case 5:
 694                 return proto_shell_set_available(state, tb);
 695         case 6:
 696                 return proto_shell_add_host_dependency(state, tb);
 697         case 7:
 698                 return proto_shell_setup_failed(state);
 699         default:
 700                 return UBUS_STATUS_INVALID_ARGUMENT;
 701         }
 702 }
 703
 704 static struct interface_proto_state *
 705 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 706                    struct blob_attr *attr)
 707 {
 708         struct proto_shell_state *state;
 709
 710         state = calloc(1, sizeof(*state));
 711         INIT_LIST_HEAD(&state->deps);
 712
 713         state->config = malloc(blob_pad_len(attr));
 714         if (!state->config)
 715                 goto error;
 716
 717         memcpy(state->config, attr, blob_pad_len(attr));
 718         state->proto.free = proto_shell_free;
 719         state->proto.notify = proto_shell_notify;
 720         state->proto.cb = proto_shell_handler;
 721         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 722         state->script_task.cb = proto_shell_script_cb;
 723         state->script_task.dir_fd = proto_fd;
 724         state->script_task.log_prefix = iface->name;
 725         state->proto_task.cb = proto_shell_task_cb;
 726         state->proto_task.dir_fd = proto_fd;
 727         state->proto_task.log_prefix = iface->name;
 728         state->handler = container_of(h, struct proto_shell_handler, proto);
 729
 730         return &state->proto;
 731
 732 error:
 733         free(state);
 734         return NULL;
 735 }
 736
 737 static json_object *
 738 check_type(json_object *obj, json_type type)
 739 {
 740         if (!obj)
 741                 return NULL;
 742
 743         if (json_object_get_type(obj) != type)
 744                 return NULL;
 745
 746         return obj;
 747 }
 748
 749 static inline json_object *
 750 get_field(json_object *obj, const char *name, json_type type)
 751 {
 752         return check_type(json_object_object_get(obj, name), type);
 753 }
 754
 755 static char *
 756 proto_shell_parse_config(struct uci_blob_param_list *config, json_object *obj)
 757 {
 758         struct blobmsg_policy *attrs;
 759         char *str_buf, *str_cur;
 760         int str_len = 0;
 761         int i;
 762
 763         config->n_params = json_object_array_length(obj);
 764         attrs = calloc(1, sizeof(*attrs) * config->n_params);
 765         if (!attrs)
 766                 return NULL;
 767
 768         config->params = attrs;
 769         for (i = 0; i < config->n_params; i++) {
 770                 json_object *cur, *name, *type;
 771
 772                 cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
 773                 if (!cur)
 774                         goto error;
 775
 776                 name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
 777                 if (!name)
 778                         goto error;
 779
 780                 type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
 781                 if (!type)
 782                         goto error;
 783
 784                 attrs[i].name = json_object_get_string(name);
 785                 attrs[i].type = json_object_get_int(type);
 786                 if (attrs[i].type > BLOBMSG_TYPE_LAST)
 787                         goto error;
 788
 789                 str_len += strlen(attrs[i].name) + 1;
 790         }
 791
 792         str_buf = malloc(str_len);
 793         if (!str_buf)
 794                 goto error;
 795
 796         str_cur = str_buf;
 797         for (i = 0; i < config->n_params; i++) {
 798                 const char *name = attrs[i].name;
 799
 800                 attrs[i].name = str_cur;
 801                 str_cur += sprintf(str_cur, "%s", name) + 1;
 802         }
 803
 804         return str_buf;
 805
 806 error:
 807         free(attrs);
 808         config->n_params = 0;
 809         return NULL;
 810 }
 811
 812 static void
 813 proto_shell_add_handler(const char *script, json_object *obj)
 814 {
 815         struct proto_shell_handler *handler;
 816         struct proto_handler *proto;
 817         json_object *config, *tmp;
 818         const char *name;
 819         char *str;
 820
 821         if (!check_type(obj, json_type_object))
 822                 return;
 823
 824         tmp = get_field(obj, "name", json_type_string);
 825         if (!tmp)
 826                 return;
 827
 828         name = json_object_get_string(tmp);
 829
 830         handler = calloc_a(sizeof(*handler) + strlen(script) + 1,
 831                            &str, strlen(name) + 1);
 832         if (!handler)
 833                 return;
 834
 835         strcpy(handler->script_name, script);
 836         strcpy(str, name);
 837
 838         proto = &handler->proto;
 839         proto->name = str;
 840         proto->config_params = &handler->config;
 841         proto->attach = proto_shell_attach;
 842
 843         tmp = get_field(obj, "no-device", json_type_boolean);
 844         if (tmp && json_object_get_boolean(tmp))
 845                 handler->proto.flags |= PROTO_FLAG_NODEV;
 846
 847         tmp = get_field(obj, "available", json_type_boolean);
 848         if (tmp && json_object_get_boolean(tmp))
 849                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 850
 851         config = get_field(obj, "config", json_type_array);
 852         if (config)
 853                 handler->config_buf = proto_shell_parse_config(&handler->config, config);
 854
 855         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 856         add_proto_handler(proto);
 857 }
 858
 859 static void __init proto_shell_init(void)
 860 {
 861         proto_fd = netifd_open_subdir("proto");
 862         if (proto_fd < 0)
 863                 return;
 864
 865         netifd_init_script_handlers(proto_fd, proto_shell_add_handler);
 866 }