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
  34 static struct netifd_fd proto_fd;
  35
  36 enum proto_shell_sm {
  37         S_IDLE,
  38         S_SETUP,
  39         S_SETUP_ABORT,
  40         S_TEARDOWN,
  41 };
  42
  43 struct proto_shell_handler {
  44         struct list_head list;
  45         struct proto_handler proto;
  46         struct config_param_list config;
  47         char *config_buf;
  48         bool init_available;
  49         char script_name[];
  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 };
  61
  62 struct proto_shell_state {
  63         struct interface_proto_state proto;
  64         struct proto_shell_handler *handler;
  65         struct blob_attr *config;
  66
  67         struct uloop_timeout teardown_timeout;
  68
  69         struct netifd_process script_task;
  70         struct netifd_process proto_task;
  71
  72         enum proto_shell_sm sm;
  73         bool proto_task_killed;
  74
  75         int last_error;
  76
  77         struct list_head deps;
  78 };
  79
  80 static void
  81 proto_shell_check_dependencies(struct proto_shell_state *state)
  82 {
  83         struct proto_shell_dependency *dep;
  84         bool available = true;
  85
  86         list_for_each_entry(dep, &state->deps, list) {
  87                 if (dep->dep.iface)
  88                         continue;
  89
  90                 available = false;
  91                 break;
  92         }
  93
  94         interface_set_available(state->proto.iface, available);
  95 }
  96
  97 static void
  98 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
  99                      enum interface_event ev);
 100 static void
 101 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 102                        enum interface_event ev);
 103
 104 static void
 105 proto_shell_update_host_dep(struct proto_shell_dependency *dep)
 106 {
 107         struct interface *iface;
 108
 109         if (dep->dep.iface)
 110                 goto out;
 111
 112         iface = interface_ip_add_target_route(&dep->host, dep->v6);
 113         if (!iface)
 114                 goto out;
 115
 116         interface_remove_user(&dep->dep);
 117         dep->dep.cb = proto_shell_if_down_cb;
 118         interface_add_user(&dep->dep, iface);
 119
 120 out:
 121         proto_shell_check_dependencies(dep->proto);
 122 }
 123
 124 static void
 125 proto_shell_clear_host_dep(struct proto_shell_state *state)
 126 {
 127         struct proto_shell_dependency *dep, *tmp;
 128
 129         list_for_each_entry_safe(dep, tmp, &state->deps, list) {
 130                 interface_remove_user(&dep->dep);
 131                 list_del(&dep->list);
 132                 free(dep);
 133         }
 134 }
 135
 136 static int
 137 proto_shell_handler(struct interface_proto_state *proto,
 138                     enum interface_proto_cmd cmd, bool force)
 139 {
 140         struct proto_shell_state *state;
 141         struct proto_shell_handler *handler;
 142         struct netifd_process *proc;
 143         static char error_buf[32];
 144         const char *argv[7];
 145         char *envp[2];
 146         const char *action;
 147         char *config;
 148         int ret, i = 0, j = 0;
 149
 150         state = container_of(proto, struct proto_shell_state, proto);
 151         handler = state->handler;
 152         proc = &state->script_task;
 153
 154         if (cmd == PROTO_CMD_SETUP) {
 155                 action = "setup";
 156                 state->last_error = -1;
 157                 proto_shell_clear_host_dep(state);
 158         } else {
 159                 if (state->sm == S_TEARDOWN)
 160                         return 0;
 161
 162                 if (state->script_task.uloop.pending) {
 163                         if (state->sm != S_SETUP_ABORT) {
 164                                 uloop_timeout_set(&state->teardown_timeout, 1000);
 165                                 kill(state->script_task.uloop.pid, SIGTERM);
 166                                 if (state->proto_task.uloop.pending)
 167                                         kill(state->proto_task.uloop.pid, SIGTERM);
 168                                 state->sm = S_SETUP_ABORT;
 169                         }
 170                         return 0;
 171                 }
 172
 173                 action = "teardown";
 174                 state->sm = S_TEARDOWN;
 175                 if (state->last_error >= 0) {
 176                         snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
 177                         envp[j++] = error_buf;
 178                 }
 179                 uloop_timeout_set(&state->teardown_timeout, 5000);
 180         }
 181
 182         config = blobmsg_format_json(state->config, true);
 183         if (!config)
 184                 return -1;
 185
 186         argv[i++] = handler->script_name;
 187         argv[i++] = handler->proto.name;
 188         argv[i++] = action;
 189         argv[i++] = proto->iface->name;
 190         argv[i++] = config;
 191         if (proto->iface->main_dev.dev)
 192                 argv[i++] = proto->iface->main_dev.dev->ifname;
 193         argv[i] = NULL;
 194         envp[j] = NULL;
 195
 196         ret = netifd_start_process(argv, envp, proc);
 197         free(config);
 198
 199         return ret;
 200 }
 201
 202 static void
 203 proto_shell_if_up_cb(struct interface_user *dep, struct interface *iface,
 204                      enum interface_event ev)
 205 {
 206         struct proto_shell_dependency *pdep;
 207
 208         if (ev != IFEV_UP)
 209                 return;
 210
 211         pdep = container_of(dep, struct proto_shell_dependency, dep);
 212         proto_shell_update_host_dep(pdep);
 213 }
 214
 215 static void
 216 proto_shell_if_down_cb(struct interface_user *dep, struct interface *iface,
 217                        enum interface_event ev)
 218 {
 219         struct proto_shell_dependency *pdep;
 220         struct proto_shell_state *state;
 221
 222         if (ev == IFEV_UP)
 223                 return;
 224
 225         pdep = container_of(dep, struct proto_shell_dependency, dep);
 226         interface_remove_user(dep);
 227         dep->cb = proto_shell_if_up_cb;
 228         interface_add_user(dep, NULL);
 229
 230         state = pdep->proto;
 231         if (state->sm == S_IDLE) {
 232                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 233                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 234         }
 235 }
 236
 237 static void
 238 proto_shell_task_finish(struct proto_shell_state *state,
 239                         struct netifd_process *task)
 240 {
 241         switch (state->sm) {
 242         case S_IDLE:
 243                 if (task == &state->proto_task)
 244                         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 245                 /* fall through */
 246         case S_SETUP:
 247                 if (task == &state->proto_task)
 248                         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
 249                                             false);
 250                 break;
 251
 252         case S_SETUP_ABORT:
 253                 if (state->script_task.uloop.pending ||
 254                     state->proto_task.uloop.pending)
 255                         break;
 256
 257                 uloop_timeout_cancel(&state->teardown_timeout);
 258                 state->sm = S_IDLE;
 259                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 260                 break;
 261
 262         case S_TEARDOWN:
 263                 if (state->script_task.uloop.pending)
 264                         break;
 265
 266                 if (state->proto_task.uloop.pending) {
 267                         if (!state->proto_task_killed)
 268                                 kill(state->proto_task.uloop.pid, SIGTERM);
 269                         break;
 270                 }
 271
 272                 uloop_timeout_cancel(&state->teardown_timeout);
 273                 state->sm = S_IDLE;
 274                 state->proto.proto_event(&state->proto, IFPEV_DOWN);
 275                 break;
 276         }
 277 }
 278
 279 static void
 280 proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 281 {
 282         struct proto_shell_state *state;
 283
 284         state = container_of(timeout, struct proto_shell_state, teardown_timeout);
 285
 286         netifd_kill_process(&state->script_task);
 287         netifd_kill_process(&state->proto_task);
 288         proto_shell_task_finish(state, NULL);
 289 }
 290
 291 static void
 292 proto_shell_script_cb(struct netifd_process *p, int ret)
 293 {
 294         struct proto_shell_state *state;
 295
 296         state = container_of(p, struct proto_shell_state, script_task);
 297         proto_shell_task_finish(state, p);
 298 }
 299
 300 static void
 301 proto_shell_task_cb(struct netifd_process *p, int ret)
 302 {
 303         struct proto_shell_state *state;
 304
 305         state = container_of(p, struct proto_shell_state, proto_task);
 306
 307         if (state->sm == S_IDLE || state->sm == S_SETUP)
 308                 state->last_error = WEXITSTATUS(ret);
 309
 310         proto_shell_task_finish(state, p);
 311 }
 312
 313 static void
 314 proto_shell_free(struct interface_proto_state *proto)
 315 {
 316         struct proto_shell_state *state;
 317
 318         state = container_of(proto, struct proto_shell_state, proto);
 319         proto_shell_clear_host_dep(state);
 320         netifd_kill_process(&state->script_task);
 321         netifd_kill_process(&state->proto_task);
 322         free(state->config);
 323         free(state);
 324 }
 325
 326 static void
 327 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 328                              bool v6)
 329 {
 330         struct blob_attr *cur;
 331         int rem;
 332
 333         blobmsg_for_each_attr(cur, attr, rem) {
 334                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 335                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 336                         continue;
 337                 }
 338
 339                 interface_ip_add_route(iface, cur, v6);
 340         }
 341 }
 342
 343 static void
 344 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 345 {
 346         struct blob_attr *cur;
 347         int rem;
 348
 349         blobmsg_for_each_attr(cur, attr, rem)
 350                 interface_add_data(iface, cur);
 351 }
 352
 353 static struct device *
 354 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 355 {
 356         struct device *dev;
 357         struct blob_buf b;
 358
 359         memset(&b, 0, sizeof(b));
 360         blob_buf_init(&b, 0);
 361         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 362         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 363         blob_buf_free(&b);
 364
 365         return dev;
 366 }
 367
 368 enum {
 369         NOTIFY_ACTION,
 370         NOTIFY_ERROR,
 371         NOTIFY_COMMAND,
 372         NOTIFY_ENV,
 373         NOTIFY_SIGNAL,
 374         NOTIFY_AVAILABLE,
 375         NOTIFY_LINK_UP,
 376         NOTIFY_IFNAME,
 377         NOTIFY_ADDR_EXT,
 378         NOTIFY_ROUTES,
 379         NOTIFY_ROUTES6,
 380         NOTIFY_TUNNEL,
 381         NOTIFY_DATA,
 382         NOTIFY_KEEP,
 383         NOTIFY_HOST,
 384         __NOTIFY_LAST
 385 };
 386
 387 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 388         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 389         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 390         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 391         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 392         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 393         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 394         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 395         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 396         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 397         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 398         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 399         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 400         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 401         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 402         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 403 };
 404
 405 static int
 406 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 407 {
 408         struct interface *iface = state->proto.iface;
 409         struct blob_attr *cur;
 410         struct device *dev;
 411         const char *devname;
 412         int dev_create = 1;
 413         bool addr_ext = false;
 414         bool keep = false;
 415         bool up;
 416
 417         if (!tb[NOTIFY_LINK_UP])
 418                 return UBUS_STATUS_INVALID_ARGUMENT;
 419
 420         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 421         if (!up) {
 422                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 423                 return 0;
 424         }
 425
 426         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 427                 keep = blobmsg_get_bool(cur);
 428
 429         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 430                 addr_ext = blobmsg_get_bool(cur);
 431                 if (addr_ext)
 432                         dev_create = 2;
 433         }
 434
 435         if (!tb[NOTIFY_IFNAME]) {
 436                 if (!iface->main_dev.dev)
 437                         return UBUS_STATUS_INVALID_ARGUMENT;
 438         } else if (!keep || iface->state != IFS_UP) {
 439                 keep = false;
 440                 devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 441                 if (tb[NOTIFY_TUNNEL]) {
 442                         dev = proto_shell_create_tunnel(devname,
 443                                 tb[NOTIFY_TUNNEL]);
 444                         if (!dev)
 445                                 return UBUS_STATUS_INVALID_ARGUMENT;
 446                 } else {
 447                         dev = device_get(devname, dev_create);
 448                         if (!dev)
 449                                 return UBUS_STATUS_NOT_FOUND;
 450                 }
 451
 452                 interface_set_l3_dev(iface, dev);
 453                 device_claim(&iface->l3_dev);
 454         }
 455
 456         if (!keep)
 457                 interface_update_start(iface);
 458
 459         proto_apply_ip_settings(iface, data, addr_ext);
 460
 461         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 462                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 463
 464         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 465                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 466
 467         interface_update_complete(state->proto.iface);
 468
 469         if (!keep)
 470                 state->proto.proto_event(&state->proto, IFPEV_UP);
 471         state->sm = S_IDLE;
 472
 473         if ((cur = tb[NOTIFY_DATA]))
 474                 proto_shell_parse_data(state->proto.iface, cur);
 475
 476         return 0;
 477 }
 478
 479 static bool
 480 fill_string_list(struct blob_attr *attr, char **argv, int max)
 481 {
 482         struct blob_attr *cur;
 483         int argc = 0;
 484         int rem;
 485
 486         if (!attr)
 487                 goto out;
 488
 489         blobmsg_for_each_attr(cur, attr, rem) {
 490                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 491                         return false;
 492
 493                 if (!blobmsg_check_attr(cur, NULL))
 494                         return false;
 495
 496                 argv[argc++] = blobmsg_data(cur);
 497                 if (argc == max - 1)
 498                         return false;
 499         }
 500
 501 out:
 502         argv[argc] = NULL;
 503         return true;
 504 }
 505
 506 static int
 507 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 508 {
 509         static char *argv[64];
 510         static char *env[32];
 511
 512         if (!tb[NOTIFY_COMMAND])
 513                 goto error;
 514
 515         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 516                 goto error;
 517
 518         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 519                 goto error;
 520
 521         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 522
 523         return 0;
 524
 525 error:
 526         return UBUS_STATUS_INVALID_ARGUMENT;
 527 }
 528
 529 static int
 530 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 531 {
 532         unsigned int signal = ~0;
 533
 534         if (tb[NOTIFY_SIGNAL])
 535                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 536
 537         if (signal > 31)
 538                 signal = SIGTERM;
 539
 540         if (state->proto_task.uloop.pending) {
 541                 state->proto_task_killed = true;
 542                 kill(state->proto_task.uloop.pid, signal);
 543         }
 544
 545         return 0;
 546 }
 547
 548 static int
 549 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 550 {
 551         struct blob_attr *cur;
 552         char *data[16];
 553         int n_data = 0;
 554         int rem;
 555
 556         if (!tb[NOTIFY_ERROR])
 557                 return UBUS_STATUS_INVALID_ARGUMENT;
 558
 559         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 560                 if (n_data + 1 == ARRAY_SIZE(data))
 561                         goto error;
 562
 563                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 564                         goto error;
 565
 566                 if (!blobmsg_check_attr(cur, NULL))
 567                         goto error;
 568
 569                 data[n_data++] = blobmsg_data(cur);
 570         }
 571
 572         if (!n_data)
 573                 goto error;
 574
 575         interface_add_error(state->proto.iface, state->handler->proto.name,
 576                         data[0], (const char **) &data[1], n_data - 1);
 577
 578         return 0;
 579
 580 error:
 581         return UBUS_STATUS_INVALID_ARGUMENT;
 582 }
 583
 584 static int
 585 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 586 {
 587         state->proto.iface->autostart = false;
 588         return 0;
 589 }
 590
 591 static int
 592 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 593 {
 594         if (!tb[NOTIFY_AVAILABLE])
 595                 return UBUS_STATUS_INVALID_ARGUMENT;
 596
 597         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 598         return 0;
 599 }
 600
 601 static int
 602 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 603 {
 604         struct proto_shell_dependency *dep;
 605         struct blob_attr *host = tb[NOTIFY_HOST];
 606
 607         if (!host)
 608                 return UBUS_STATUS_INVALID_ARGUMENT;
 609
 610         dep = calloc(1, sizeof(*dep));
 611         if (!inet_pton(AF_INET, blobmsg_data(host), &dep->host)) {
 612                 free(dep);
 613                 return UBUS_STATUS_INVALID_ARGUMENT;
 614         }
 615
 616         dep->proto = state;
 617         dep->dep.cb = proto_shell_if_up_cb;
 618         interface_add_user(&dep->dep, NULL);
 619         list_add(&dep->list, &state->deps);
 620         proto_shell_update_host_dep(dep);
 621         if (!dep->dep.iface)
 622                 return UBUS_STATUS_NOT_FOUND;
 623
 624         return 0;
 625 }
 626
 627 static int
 628 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 629 {
 630         struct proto_shell_state *state;
 631         struct blob_attr *tb[__NOTIFY_LAST];
 632
 633         state = container_of(proto, struct proto_shell_state, proto);
 634
 635         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 636         if (!tb[NOTIFY_ACTION])
 637                 return UBUS_STATUS_INVALID_ARGUMENT;
 638
 639         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 640         case 0:
 641                 return proto_shell_update_link(state, attr, tb);
 642         case 1:
 643                 return proto_shell_run_command(state, tb);
 644         case 2:
 645                 return proto_shell_kill_command(state, tb);
 646         case 3:
 647                 return proto_shell_notify_error(state, tb);
 648         case 4:
 649                 return proto_shell_block_restart(state, tb);
 650         case 5:
 651                 return proto_shell_set_available(state, tb);
 652         case 6:
 653                 return proto_shell_add_host_dependency(state, tb);
 654         default:
 655                 return UBUS_STATUS_INVALID_ARGUMENT;
 656         }
 657 }
 658
 659 static struct interface_proto_state *
 660 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 661                    struct blob_attr *attr)
 662 {
 663         struct proto_shell_state *state;
 664
 665         state = calloc(1, sizeof(*state));
 666         INIT_LIST_HEAD(&state->deps);
 667
 668         state->config = malloc(blob_pad_len(attr));
 669         if (!state->config)
 670                 goto error;
 671
 672         memcpy(state->config, attr, blob_pad_len(attr));
 673         state->proto.free = proto_shell_free;
 674         state->proto.notify = proto_shell_notify;
 675         state->proto.cb = proto_shell_handler;
 676         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 677         state->script_task.cb = proto_shell_script_cb;
 678         state->script_task.dir_fd = proto_fd.fd;
 679         state->script_task.log_prefix = iface->name;
 680         state->proto_task.cb = proto_shell_task_cb;
 681         state->proto_task.dir_fd = proto_fd.fd;
 682         state->proto_task.log_prefix = iface->name;
 683         state->handler = container_of(h, struct proto_shell_handler, proto);
 684
 685         return &state->proto;
 686
 687 error:
 688         free(state);
 689         return NULL;
 690 }
 691
 692 static json_object *
 693 check_type(json_object *obj, json_type type)
 694 {
 695         if (!obj)
 696                 return NULL;
 697
 698         if (json_object_get_type(obj) != type)
 699                 return NULL;
 700
 701         return obj;
 702 }
 703
 704 static inline json_object *
 705 get_field(json_object *obj, const char *name, json_type type)
 706 {
 707         return check_type(json_object_object_get(obj, name), type);
 708 }
 709
 710 static char *
 711 proto_shell_parse_config(struct config_param_list *config, json_object *obj)
 712 {
 713         struct blobmsg_policy *attrs;
 714         char *str_buf, *str_cur;
 715         int str_len = 0;
 716         int i;
 717
 718         config->n_params = json_object_array_length(obj);
 719         attrs = calloc(1, sizeof(*attrs) * config->n_params);
 720         if (!attrs)
 721                 return NULL;
 722
 723         config->params = attrs;
 724         for (i = 0; i < config->n_params; i++) {
 725                 json_object *cur, *name, *type;
 726
 727                 cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
 728                 if (!cur)
 729                         goto error;
 730
 731                 name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
 732                 if (!name)
 733                         goto error;
 734
 735                 type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
 736                 if (!type)
 737                         goto error;
 738
 739                 attrs[i].name = json_object_get_string(name);
 740                 attrs[i].type = json_object_get_int(type);
 741                 if (attrs[i].type > BLOBMSG_TYPE_LAST)
 742                         goto error;
 743
 744                 str_len += strlen(attrs[i].name) + 1;
 745         }
 746
 747         str_buf = malloc(str_len);
 748         if (!str_buf)
 749                 goto error;
 750
 751         str_cur = str_buf;
 752         for (i = 0; i < config->n_params; i++) {
 753                 const char *name = attrs[i].name;
 754
 755                 attrs[i].name = str_cur;
 756                 str_cur += sprintf(str_cur, "%s", name) + 1;
 757         }
 758
 759         return str_buf;
 760
 761 error:
 762         free(attrs);
 763         config->n_params = 0;
 764         return NULL;
 765 }
 766
 767 static void
 768 proto_shell_add_handler(const char *script, json_object *obj)
 769 {
 770         struct proto_shell_handler *handler;
 771         struct proto_handler *proto;
 772         json_object *config, *tmp;
 773         const char *name;
 774         char *str;
 775
 776         if (!check_type(obj, json_type_object))
 777                 return;
 778
 779         tmp = get_field(obj, "name", json_type_string);
 780         if (!tmp)
 781                 return;
 782
 783         name = json_object_get_string(tmp);
 784
 785         handler = calloc(1, sizeof(*handler) +
 786                          strlen(script) + 1 +
 787                          strlen(name) + 1);
 788         if (!handler)
 789                 return;
 790
 791         strcpy(handler->script_name, script);
 792
 793         str = handler->script_name + strlen(handler->script_name) + 1;
 794         strcpy(str, name);
 795
 796         proto = &handler->proto;
 797         proto->name = str;
 798         proto->config_params = &handler->config;
 799         proto->attach = proto_shell_attach;
 800
 801         tmp = get_field(obj, "no-device", json_type_boolean);
 802         if (tmp && json_object_get_boolean(tmp))
 803                 handler->proto.flags |= PROTO_FLAG_NODEV;
 804
 805         tmp = get_field(obj, "available", json_type_boolean);
 806         if (tmp && json_object_get_boolean(tmp))
 807                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 808
 809         config = get_field(obj, "config", json_type_array);
 810         if (config)
 811                 handler->config_buf = proto_shell_parse_config(&handler->config, config);
 812
 813         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 814         add_proto_handler(proto);
 815 }
 816
 817 static void proto_shell_add_script(const char *name)
 818 {
 819         struct json_tokener *tok = NULL;
 820         json_object *obj;
 821         static char buf[512];
 822         char *start, *cmd;
 823         FILE *f;
 824         int len;
 825
 826 #define DUMP_SUFFIX     " '' dump"
 827
 828         cmd = alloca(strlen(name) + 1 + sizeof(DUMP_SUFFIX));
 829         sprintf(cmd, "%s" DUMP_SUFFIX, name);
 830
 831         f = popen(cmd, "r");
 832         if (!f)
 833                 return;
 834
 835         do {
 836                 start = fgets(buf, sizeof(buf), f);
 837                 if (!start)
 838                         continue;
 839
 840                 len = strlen(start);
 841
 842                 if (!tok)
 843                         tok = json_tokener_new();
 844
 845                 obj = json_tokener_parse_ex(tok, start, len);
 846                 if (!is_error(obj)) {
 847                         proto_shell_add_handler(name, obj);
 848                         json_object_put(obj);
 849                         json_tokener_free(tok);
 850                         tok = NULL;
 851                 } else if (start[len - 1] == '\n') {
 852                         json_tokener_free(tok);
 853                         tok = NULL;
 854                 }
 855         } while (!feof(f) && !ferror(f));
 856
 857         if (tok)
 858                 json_tokener_free(tok);
 859
 860         pclose(f);
 861 }
 862
 863 static void __init proto_shell_init(void)
 864 {
 865         glob_t g;
 866         int main_fd;
 867         int i;
 868
 869         main_fd = open(".", O_RDONLY | O_DIRECTORY);
 870         if (main_fd < 0)
 871                 return;
 872
 873         if (chdir(main_path)) {
 874                 perror("chdir(main path)");
 875                 goto close_cur;
 876         }
 877
 878         if (chdir("./proto"))
 879                 goto close_cur;
 880
 881         proto_fd.fd = open(".", O_RDONLY | O_DIRECTORY);
 882         if (proto_fd.fd < 0)
 883                 goto close_cur;
 884
 885         netifd_fd_add(&proto_fd);
 886         glob("./*.sh", 0, NULL, &g);
 887         for (i = 0; i < g.gl_pathc; i++)
 888                 proto_shell_add_script(g.gl_pathv[i]);
 889
 890 close_cur:
 891         fchdir(main_fd);
 892         close(main_fd);
 893 }