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 <glob.h>
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22 #include <signal.h>
  23
  24 #include <arpa/inet.h>
  25 #include <netinet/in.h>
  26
  27 #include <libubox/blobmsg_json.h>
  28
  29 #include "netifd.h"
  30 #include "interface.h"
  31 #include "interface-ip.h"
  32 #include "proto.h"
  33 #include "system.h"
  34
  35 static int proto_fd = -1;
  36
  37 enum proto_shell_sm {
  38         S_IDLE,
  39         S_SETUP,
  40         S_SETUP_ABORT,
  41         S_TEARDOWN,
  42 };
  43
  44 struct proto_shell_handler {
  45         struct list_head list;
  46         struct proto_handler proto;
  47         struct uci_blob_param_list config;
  48         char *config_buf;
  49         bool init_available;
  50         char script_name[];
  51 };
  52
  53 struct proto_shell_dependency {
  54         struct list_head list;
  55
  56         struct proto_shell_state *proto;
  57         struct interface_user dep;
  58
  59         union if_addr host;
  60         bool v6;
  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         struct netifd_process script_task;
  73         struct netifd_process proto_task;
  74
  75         enum proto_shell_sm sm;
  76         bool proto_task_killed;
  77
  78         int last_error;
  79
  80         struct list_head deps;
  81 };
  82
  83 static void
  84 proto_shell_check_dependencies(struct proto_shell_state *state)
  85 {
  86         struct proto_shell_dependency *dep;
  87         bool available = true;
  88
  89         list_for_each_entry(dep, &state->deps, list) {
  90                 if (dep->dep.iface)
  91                         continue;
  92
  93                 available = false;
  94                 break;
  95         }
  96
  97         interface_set_available(state->proto.iface, available);
  98 }
  99
 100 static void
 101 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 102                      enum interface_event ev);
 103 static void
 104 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 105                        enum interface_event ev);
 106
 107 static void
 108 proto_shell_update_host_dep(struct proto_shell_dependency *dep)
 109 {
 110         struct interface *iface = NULL;
 111
 112         if (dep->dep.iface)
 113                 goto out;
 114
 115         if (dep->interface[0])
 116                 iface = vlist_find(&interfaces, dep->interface, iface, node);
 117
 118         iface = interface_ip_add_target_route(&dep->host, dep->v6, iface);
 119         if (!iface)
 120                 goto out;
 121
 122         interface_remove_user(&dep->dep);
 123         dep->dep.cb = proto_shell_if_down_cb;
 124         interface_add_user(&dep->dep, iface);
 125
 126 out:
 127         proto_shell_check_dependencies(dep->proto);
 128 }
 129
 130 static void
 131 proto_shell_clear_host_dep(struct proto_shell_state *state)
 132 {
 133         struct proto_shell_dependency *dep, *tmp;
 134
 135         list_for_each_entry_safe(dep, tmp, &state->deps, list) {
 136                 interface_remove_user(&dep->dep);
 137                 list_del(&dep->list);
 138                 free(dep);
 139         }
 140 }
 141
 142 static int
 143 proto_shell_handler(struct interface_proto_state *proto,
 144                     enum interface_proto_cmd cmd, bool force)
 145 {
 146         struct proto_shell_state *state;
 147         struct proto_shell_handler *handler;
 148         struct netifd_process *proc;
 149         static char error_buf[32];
 150         const char *argv[7];
 151         char *envp[2];
 152         const char *action;
 153         char *config;
 154         int ret, i = 0, j = 0;
 155
 156         state = container_of(proto, struct proto_shell_state, proto);
 157         handler = state->handler;
 158         proc = &state->script_task;
 159
 160         if (cmd == PROTO_CMD_SETUP) {
 161                 action = "setup";
 162                 state->last_error = -1;
 163                 proto_shell_clear_host_dep(state);
 164         } else {
 165                 if (state->sm == S_TEARDOWN)
 166                         return 0;
 167
 168                 if (state->script_task.uloop.pending) {
 169                         if (state->sm != S_SETUP_ABORT) {
 170                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 171                                 kill(state->script_task.uloop.pid, SIGTERM);
 172                                 if (state->proto_task.uloop.pending)
 173                                         kill(state->proto_task.uloop.pid, SIGTERM);
 174                                 state->sm = S_SETUP_ABORT;
 175                         }
 176                         return 0;
 177                 }
 178
 179                 action = "teardown";
 180                 state->sm = S_TEARDOWN;
 181                 if (state->last_error >= 0) {
 182                         snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 183                         envp[j++] = error_buf;
 184                 }
 185                 uloop_timeout_set(&state->teardown_timeout, 5000);
 186         }
 187
 188         config = blobmsg_format_json(state->config, true);
 189         if (!config)
 190                 return -1;
 191
 192         argv[i++] = handler->script_name;
 193         argv[i++] = handler->proto.name;
 194         argv[i++] = action;
 195         argv[i++] = proto->iface->name;
 196         argv[i++] = config;
 197         if (proto->iface->main_dev.dev)
 198                 argv[i++] = proto->iface->main_dev.dev->ifname;
 199         argv[i] = NULL;
 200         envp[j] = NULL;
 201
 202         ret = netifd_start_process(argv, envp, proc);
 203         free(config);
 204
 205         return ret;
 206 }
 207
 208 static void
 209 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 210                      enum interface_event ev)
 211 {
 212         struct proto_shell_dependency *pdep;
 213
 214         if (ev != IFEV_UP && ev != IFEV_UPDATE)
 215                 return;
 216
 217         pdep = container_of(dep, struct proto_shell_dependency, dep);
 218         proto_shell_update_host_dep(pdep);
 219 }
 220
 221 static void
 222 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 223                        enum interface_event ev)
 224 {
 225         struct proto_shell_dependency *pdep;
 226         struct proto_shell_state *state;
 227
 228         if (ev == IFEV_UP || ev == IFEV_UPDATE)
 229                 return;
 230
 231         pdep = container_of(dep, struct proto_shell_dependency, dep);
 232         interface_remove_user(dep);
 233         dep->cb = proto_shell_if_up_cb;
 234         interface_add_user(dep, NULL);
 235
 236         state = pdep->proto;
 237         if (state->sm == S_IDLE) {
 238                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 239                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 240         }
 241 }
 242
 243 static void
 244 proto_shell_task_finish(struct proto_shell_state *state,
 245                         struct netifd_process *task)
 246 {
 247         switch (state->sm) {
 248         case S_IDLE:
 249                 if (task == &state->proto_task)
 250                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 251                 /* fall through */
 252         case S_SETUP:
 253                 if (task == &state->proto_task)
 254                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 255                                             false);
 256                 break;
 257
 258         case S_SETUP_ABORT:
 259                 if (state->script_task.uloop.pending ||
 260                     state->proto_task.uloop.pending)
 261                         break;
 262
 263                 uloop_timeout_cancel(&state->teardown_timeout);
 264                 state->sm = S_IDLE;
 265                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 266                 break;
 267
 268         case S_TEARDOWN:
 269                 if (state->script_task.uloop.pending)
 270                         break;
 271
 272                 if (state->proto_task.uloop.pending) {
 273                         if (!state->proto_task_killed)
 274                                 kill(state->proto_task.uloop.pid, SIGTERM);
 275                         break;
 276                 }
 277
 278                 uloop_timeout_cancel(&state->teardown_timeout);
 279                 state->sm = S_IDLE;
 280                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 281                 break;
 282         }
 283 }
 284
 285 static void
 286 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 287 {
 288         struct proto_shell_state *state;
 289
 290         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 291
 292         netifd_kill_process(&state->script_task);
 293         netifd_kill_process(&state->proto_task);
 294         proto_shell_task_finish(state, NULL);
 295 }
 296
 297 static void
 298 proto_shell_script_cb(struct netifd_process *p, int ret)
 299 {
 300         struct proto_shell_state *state;
 301
 302         state = container_of(p, struct proto_shell_state, script_task);
 303         proto_shell_task_finish(state, p);
 304 }
 305
 306 static void
 307 proto_shell_task_cb(struct netifd_process *p, int ret)
 308 {
 309         struct proto_shell_state *state;
 310
 311         state = container_of(p, struct proto_shell_state, proto_task);
 312
 313         if (state->sm == S_IDLE || state->sm == S_SETUP)
 314                 state->last_error = WEXITSTATUS(ret);
 315
 316         proto_shell_task_finish(state, p);
 317 }
 318
 319 static void
 320 proto_shell_free(struct interface_proto_state *proto)
 321 {
 322         struct proto_shell_state *state;
 323
 324         state = container_of(proto, struct proto_shell_state, proto);
 325         uloop_timeout_cancel(&state->teardown_timeout);
 326         proto_shell_clear_host_dep(state);
 327         netifd_kill_process(&state->script_task);
 328         netifd_kill_process(&state->proto_task);
 329         free(state->config);
 330         free(state);
 331 }
 332
 333 static void
 334 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 335                              bool v6)
 336 {
 337         struct blob_attr *cur;
 338         int rem;
 339
 340         blobmsg_for_each_attr(cur, attr, rem) {
 341                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 342                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 343                         continue;
 344                 }
 345
 346                 interface_ip_add_route(iface, cur, v6);
 347         }
 348 }
 349
 350 static void
 351 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 352 {
 353         struct blob_attr *cur;
 354         int rem;
 355
 356         blobmsg_for_each_attr(cur, attr, rem)
 357                 interface_add_data(iface, cur);
 358 }
 359
 360 static struct device *
 361 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 362 {
 363         struct device *dev;
 364         struct blob_buf b;
 365
 366         memset(&b, 0, sizeof(b));
 367         blob_buf_init(&b, 0);
 368         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 369         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 370         blob_buf_free(&b);
 371
 372         return dev;
 373 }
 374
 375 enum {
 376         NOTIFY_ACTION,
 377         NOTIFY_ERROR,
 378         NOTIFY_COMMAND,
 379         NOTIFY_ENV,
 380         NOTIFY_SIGNAL,
 381         NOTIFY_AVAILABLE,
 382         NOTIFY_LINK_UP,
 383         NOTIFY_IFNAME,
 384         NOTIFY_ADDR_EXT,
 385         NOTIFY_ROUTES,
 386         NOTIFY_ROUTES6,
 387         NOTIFY_TUNNEL,
 388         NOTIFY_DATA,
 389         NOTIFY_KEEP,
 390         NOTIFY_HOST,
 391         NOTIFY_DNS,
 392         NOTIFY_DNS_SEARCH,
 393         __NOTIFY_LAST
 394 };
 395
 396 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 397         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 398         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 399         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 400         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 401         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 402         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 403         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 404         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 405         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 406         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 407         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 408         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 409         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 410         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 411         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 412         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 413         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 414 };
 415
 416 static int
 417 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 418 {
 419         struct interface *iface = state->proto.iface;
 420         struct blob_attr *cur;
 421         struct device *dev;
 422         const char *devname;
 423         int dev_create = 1;
 424         bool addr_ext = false;
 425         bool keep = false;
 426         bool up;
 427
 428         if (!tb[NOTIFY_LINK_UP])
 429                 return UBUS_STATUS_INVALID_ARGUMENT;
 430
 431         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 432         if (!up) {
 433                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 434                 return 0;
 435         }
 436
 437         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 438                 keep = blobmsg_get_bool(cur);
 439
 440         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 441                 addr_ext = blobmsg_get_bool(cur);
 442                 if (addr_ext)
 443                         dev_create = 2;
 444         }
 445
 446         if (!tb[NOTIFY_IFNAME]) {
 447                 if (!iface->main_dev.dev)
 448                         return UBUS_STATUS_INVALID_ARGUMENT;
 449         } else if (!keep || iface->state != IFS_UP) {
 450                 keep = false;
 451                 devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 452                 if (tb[NOTIFY_TUNNEL]) {
 453                         dev = proto_shell_create_tunnel(devname,
 454                                 tb[NOTIFY_TUNNEL]);
 455                         if (!dev)
 456                                 return UBUS_STATUS_INVALID_ARGUMENT;
 457                 } else {
 458                         dev = device_get(devname, dev_create);
 459                         if (!dev)
 460                                 return UBUS_STATUS_NOT_FOUND;
 461                 }
 462
 463                 interface_set_l3_dev(iface, dev);
 464                 device_claim(&iface->l3_dev);
 465                 device_set_present(dev, true);
 466         }
 467
 468         if (!keep)
 469                 interface_update_start(iface);
 470
 471         proto_apply_ip_settings(iface, data, addr_ext);
 472
 473         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 474                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 475
 476         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 477                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 478
 479         if ((cur = tb[NOTIFY_DNS]))
 480                 interface_add_dns_server_list(&iface->proto_ip, cur);
 481
 482         if ((cur = tb[NOTIFY_DNS_SEARCH]))
 483                 interface_add_dns_search_list(&iface->proto_ip, cur);
 484
 485         interface_update_complete(state->proto.iface);
 486
 487         if (!keep)
 488                 state->proto.proto_event(&state->proto, IFPEV_UP);
 489         state->sm = S_IDLE;
 490
 491         if ((cur = tb[NOTIFY_DATA]))
 492                 proto_shell_parse_data(state->proto.iface, cur);
 493
 494         return 0;
 495 }
 496
 497 static bool
 498 fill_string_list(struct blob_attr *attr, char **argv, int max)
 499 {
 500         struct blob_attr *cur;
 501         int argc = 0;
 502         int rem;
 503
 504         if (!attr)
 505                 goto out;
 506
 507         blobmsg_for_each_attr(cur, attr, rem) {
 508                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 509                         return false;
 510
 511                 if (!blobmsg_check_attr(cur, NULL))
 512                         return false;
 513
 514                 argv[argc++] = blobmsg_data(cur);
 515                 if (argc == max - 1)
 516                         return false;
 517         }
 518
 519 out:
 520         argv[argc] = NULL;
 521         return true;
 522 }
 523
 524 static int
 525 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 526 {
 527         static char *argv[64];
 528         static char *env[32];
 529
 530         if (!tb[NOTIFY_COMMAND])
 531                 goto error;
 532
 533         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 534                 goto error;
 535
 536         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 537                 goto error;
 538
 539         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 540
 541         return 0;
 542
 543 error:
 544         return UBUS_STATUS_INVALID_ARGUMENT;
 545 }
 546
 547 static int
 548 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 549 {
 550         unsigned int signal = ~0;
 551
 552         if (tb[NOTIFY_SIGNAL])
 553                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 554
 555         if (signal > 31)
 556                 signal = SIGTERM;
 557
 558         if (state->proto_task.uloop.pending) {
 559                 state->proto_task_killed = true;
 560                 kill(state->proto_task.uloop.pid, signal);
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int
 567 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 568 {
 569         struct blob_attr *cur;
 570         char *data[16];
 571         int n_data = 0;
 572         int rem;
 573
 574         if (!tb[NOTIFY_ERROR])
 575                 return UBUS_STATUS_INVALID_ARGUMENT;
 576
 577         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 578                 if (n_data + 1 == ARRAY_SIZE(data))
 579                         goto error;
 580
 581                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 582                         goto error;
 583
 584                 if (!blobmsg_check_attr(cur, NULL))
 585                         goto error;
 586
 587                 data[n_data++] = blobmsg_data(cur);
 588         }
 589
 590         if (!n_data)
 591                 goto error;
 592
 593         interface_add_error(state->proto.iface, state->handler->proto.name,
 594                         data[0], (const char **) &data[1], n_data - 1);
 595
 596         return 0;
 597
 598 error:
 599         return UBUS_STATUS_INVALID_ARGUMENT;
 600 }
 601
 602 static int
 603 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 604 {
 605         state->proto.iface->autostart = false;
 606         return 0;
 607 }
 608
 609 static int
 610 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 611 {
 612         if (!tb[NOTIFY_AVAILABLE])
 613                 return UBUS_STATUS_INVALID_ARGUMENT;
 614
 615         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 616         return 0;
 617 }
 618
 619 static int
 620 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 621 {
 622         struct proto_shell_dependency *dep;
 623         struct blob_attr *host = tb[NOTIFY_HOST];
 624         struct blob_attr *ifname = tb[NOTIFY_IFNAME];
 625         size_t ifnamelen = (ifname) ? blobmsg_data_len(ifname) : 1;
 626
 627         if (!host)
 628                 return UBUS_STATUS_INVALID_ARGUMENT;
 629
 630         dep = calloc(1, sizeof(*dep) + ifnamelen);
 631         if (inet_pton(AF_INET, blobmsg_data(host), &dep->host) < 1) {
 632                 if (inet_pton(AF_INET6, blobmsg_data(host), &dep->host) < 1) {
 633                         free(dep);
 634                         return UBUS_STATUS_INVALID_ARGUMENT;
 635                 } else {
 636                         dep->v6 = true;
 637                 }
 638         }
 639
 640         dep->proto = state;
 641         if (ifname)
 642                 memcpy(dep->interface, blobmsg_data(ifname), ifnamelen);
 643         else
 644                 dep->interface[0] = 0;
 645
 646         dep->dep.cb = proto_shell_if_up_cb;
 647         interface_add_user(&dep->dep, NULL);
 648         list_add(&dep->list, &state->deps);
 649         proto_shell_update_host_dep(dep);
 650         if (!dep->dep.iface)
 651                 return UBUS_STATUS_NOT_FOUND;
 652
 653         return 0;
 654 }
 655
 656 static int
 657 proto_shell_setup_failed(struct proto_shell_state *state)
 658 {
 659         switch (state->sm) {
 660         case S_IDLE:
 661                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 662                 /* fall through */
 663         case S_SETUP:
 664                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 665                 break;
 666         default:
 667                 break;
 668         }
 669         return 0;
 670 }
 671
 672 static int
 673 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 674 {
 675         struct proto_shell_state *state;
 676         struct blob_attr *tb[__NOTIFY_LAST];
 677
 678         state = container_of(proto, struct proto_shell_state, proto);
 679
 680         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 681         if (!tb[NOTIFY_ACTION])
 682                 return UBUS_STATUS_INVALID_ARGUMENT;
 683
 684         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 685         case 0:
 686                 return proto_shell_update_link(state, attr, tb);
 687         case 1:
 688                 return proto_shell_run_command(state, tb);
 689         case 2:
 690                 return proto_shell_kill_command(state, tb);
 691         case 3:
 692                 return proto_shell_notify_error(state, tb);
 693         case 4:
 694                 return proto_shell_block_restart(state, tb);
 695         case 5:
 696                 return proto_shell_set_available(state, tb);
 697         case 6:
 698                 return proto_shell_add_host_dependency(state, tb);
 699         case 7:
 700                 return proto_shell_setup_failed(state);
 701         default:
 702                 return UBUS_STATUS_INVALID_ARGUMENT;
 703         }
 704 }
 705
 706 static struct interface_proto_state *
 707 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 708                    struct blob_attr *attr)
 709 {
 710         struct proto_shell_state *state;
 711
 712         state = calloc(1, sizeof(*state));
 713         INIT_LIST_HEAD(&state->deps);
 714
 715         state->config = malloc(blob_pad_len(attr));
 716         if (!state->config)
 717                 goto error;
 718
 719         memcpy(state->config, attr, blob_pad_len(attr));
 720         state->proto.free = proto_shell_free;
 721         state->proto.notify = proto_shell_notify;
 722         state->proto.cb = proto_shell_handler;
 723         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 724         state->script_task.cb = proto_shell_script_cb;
 725         state->script_task.dir_fd = proto_fd;
 726         state->script_task.log_prefix = iface->name;
 727         state->proto_task.cb = proto_shell_task_cb;
 728         state->proto_task.dir_fd = proto_fd;
 729         state->proto_task.log_prefix = iface->name;
 730         state->handler = container_of(h, struct proto_shell_handler, proto);
 731
 732         return &state->proto;
 733
 734 error:
 735         free(state);
 736         return NULL;
 737 }
 738
 739 static json_object *
 740 check_type(json_object *obj, json_type type)
 741 {
 742         if (!obj)
 743                 return NULL;
 744
 745         if (json_object_get_type(obj) != type)
 746                 return NULL;
 747
 748         return obj;
 749 }
 750
 751 static inline json_object *
 752 get_field(json_object *obj, const char *name, json_type type)
 753 {
 754         return check_type(json_object_object_get(obj, name), type);
 755 }
 756
 757 static char *
 758 proto_shell_parse_config(struct uci_blob_param_list *config, json_object *obj)
 759 {
 760         struct blobmsg_policy *attrs;
 761         char *str_buf, *str_cur;
 762         int str_len = 0;
 763         int i;
 764
 765         config->n_params = json_object_array_length(obj);
 766         attrs = calloc(1, sizeof(*attrs) * config->n_params);
 767         if (!attrs)
 768                 return NULL;
 769
 770         config->params = attrs;
 771         for (i = 0; i < config->n_params; i++) {
 772                 json_object *cur, *name, *type;
 773
 774                 cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
 775                 if (!cur)
 776                         goto error;
 777
 778                 name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
 779                 if (!name)
 780                         goto error;
 781
 782                 type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
 783                 if (!type)
 784                         goto error;
 785
 786                 attrs[i].name = json_object_get_string(name);
 787                 attrs[i].type = json_object_get_int(type);
 788                 if (attrs[i].type > BLOBMSG_TYPE_LAST)
 789                         goto error;
 790
 791                 str_len += strlen(attrs[i].name) + 1;
 792         }
 793
 794         str_buf = malloc(str_len);
 795         if (!str_buf)
 796                 goto error;
 797
 798         str_cur = str_buf;
 799         for (i = 0; i < config->n_params; i++) {
 800                 const char *name = attrs[i].name;
 801
 802                 attrs[i].name = str_cur;
 803                 str_cur += sprintf(str_cur, "%s", name) + 1;
 804         }
 805
 806         return str_buf;
 807
 808 error:
 809         free(attrs);
 810         config->n_params = 0;
 811         return NULL;
 812 }
 813
 814 static void
 815 proto_shell_add_handler(const char *script, json_object *obj)
 816 {
 817         struct proto_shell_handler *handler;
 818         struct proto_handler *proto;
 819         json_object *config, *tmp;
 820         const char *name;
 821         char *str;
 822
 823         if (!check_type(obj, json_type_object))
 824                 return;
 825
 826         tmp = get_field(obj, "name", json_type_string);
 827         if (!tmp)
 828                 return;
 829
 830         name = json_object_get_string(tmp);
 831
 832         handler = calloc_a(sizeof(*handler) + strlen(script) + 1,
 833                            &str, strlen(name) + 1);
 834         if (!handler)
 835                 return;
 836
 837         strcpy(handler->script_name, script);
 838         strcpy(str, name);
 839
 840         proto = &handler->proto;
 841         proto->name = str;
 842         proto->config_params = &handler->config;
 843         proto->attach = proto_shell_attach;
 844
 845         tmp = get_field(obj, "no-device", json_type_boolean);
 846         if (tmp && json_object_get_boolean(tmp))
 847                 handler->proto.flags |= PROTO_FLAG_NODEV;
 848
 849         tmp = get_field(obj, "available", json_type_boolean);
 850         if (tmp && json_object_get_boolean(tmp))
 851                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 852
 853         config = get_field(obj, "config", json_type_array);
 854         if (config)
 855                 handler->config_buf = proto_shell_parse_config(&handler->config, config);
 856
 857         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 858         add_proto_handler(proto);
 859 }
 860
 861 static void proto_shell_add_script(const char *name)
 862 {
 863         struct json_tokener *tok = NULL;
 864         json_object *obj;
 865         static char buf[512];
 866         char *start, *cmd;
 867         FILE *f;
 868         int len;
 869
 870 #define DUMP_SUFFIX     " '' dump"
 871
 872         cmd = alloca(strlen(name) + 1 + sizeof(DUMP_SUFFIX));
 873         sprintf(cmd, "%s" DUMP_SUFFIX, name);
 874
 875         f = popen(cmd, "r");
 876         if (!f)
 877                 return;
 878
 879         do {
 880                 start = fgets(buf, sizeof(buf), f);
 881                 if (!start)
 882                         continue;
 883
 884                 len = strlen(start);
 885
 886                 if (!tok)
 887                         tok = json_tokener_new();
 888
 889                 obj = json_tokener_parse_ex(tok, start, len);
 890                 if (!is_error(obj)) {
 891                         proto_shell_add_handler(name, obj);
 892                         json_object_put(obj);
 893                         json_tokener_free(tok);
 894                         tok = NULL;
 895                 } else if (start[len - 1] == '\n') {
 896                         json_tokener_free(tok);
 897                         tok = NULL;
 898                 }
 899         } while (!feof(f) && !ferror(f));
 900
 901         if (tok)
 902                 json_tokener_free(tok);
 903
 904         pclose(f);
 905 }
 906
 907 static void __init proto_shell_init(void)
 908 {
 909         glob_t g;
 910         int main_fd;
 911         int i;
 912
 913         main_fd = open(".", O_RDONLY | O_DIRECTORY);
 914         if (main_fd < 0)
 915                 return;
 916
 917         if (chdir(main_path)) {
 918                 perror("chdir(main path)");
 919                 goto close_cur;
 920         }
 921
 922         if (chdir("./proto"))
 923                 goto close_cur;
 924
 925         proto_fd = open(".", O_RDONLY | O_DIRECTORY);
 926         if (proto_fd < 0)
 927                 goto close_cur;
 928
 929         system_fd_set_cloexec(proto_fd);
 930         glob("./*.sh", 0, NULL, &g);
 931         for (i = 0; i < g.gl_pathc; i++)
 932                 proto_shell_add_script(g.gl_pathv[i]);
 933
 934 close_cur:
 935         fchdir(main_fd);
 936         close(main_fd);
 937 }