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         netifd_kill_process(&state->script_task);
 320         netifd_kill_process(&state->proto_task);
 321         free(state->config);
 322         free(state);
 323 }
 324
 325 static void
 326 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 327                              bool v6)
 328 {
 329         struct blob_attr *cur;
 330         int rem;
 331
 332         blobmsg_for_each_attr(cur, attr, rem) {
 333                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 334                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 335                         continue;
 336                 }
 337
 338                 interface_ip_add_route(iface, cur, v6);
 339         }
 340 }
 341
 342 static void
 343 proto_shell_parse_data(struct interface *iface, struct blob_attr *attr)
 344 {
 345         struct blob_attr *cur;
 346         int rem;
 347
 348         blobmsg_for_each_attr(cur, attr, rem)
 349                 interface_add_data(iface, cur);
 350 }
 351
 352 static struct device *
 353 proto_shell_create_tunnel(const char *name, struct blob_attr *attr)
 354 {
 355         struct device *dev;
 356         struct blob_buf b;
 357
 358         memset(&b, 0, sizeof(b));
 359         blob_buf_init(&b, 0);
 360         blob_put(&b, 0, blobmsg_data(attr), blobmsg_data_len(attr));
 361         dev = device_create(name, &tunnel_device_type, blob_data(b.head));
 362         blob_buf_free(&b);
 363
 364         return dev;
 365 }
 366
 367 enum {
 368         NOTIFY_ACTION,
 369         NOTIFY_ERROR,
 370         NOTIFY_COMMAND,
 371         NOTIFY_ENV,
 372         NOTIFY_SIGNAL,
 373         NOTIFY_AVAILABLE,
 374         NOTIFY_LINK_UP,
 375         NOTIFY_IFNAME,
 376         NOTIFY_ADDR_EXT,
 377         NOTIFY_ROUTES,
 378         NOTIFY_ROUTES6,
 379         NOTIFY_TUNNEL,
 380         NOTIFY_DATA,
 381         NOTIFY_KEEP,
 382         NOTIFY_HOST,
 383         __NOTIFY_LAST
 384 };
 385
 386 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 387         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 388         [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
 389         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 390         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 391         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 392         [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
 393         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 394         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 395         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 396         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 397         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 398         [NOTIFY_TUNNEL] = { .name = "tunnel", .type = BLOBMSG_TYPE_TABLE },
 399         [NOTIFY_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 400         [NOTIFY_KEEP] = { .name = "keep", .type = BLOBMSG_TYPE_BOOL },
 401         [NOTIFY_HOST] = { .name = "host", .type = BLOBMSG_TYPE_STRING },
 402 };
 403
 404 static int
 405 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr *data, struct blob_attr **tb)
 406 {
 407         struct interface *iface = state->proto.iface;
 408         struct blob_attr *cur;
 409         struct device *dev;
 410         const char *devname;
 411         int dev_create = 1;
 412         bool addr_ext = false;
 413         bool keep = false;
 414         bool up;
 415
 416         if (!tb[NOTIFY_LINK_UP])
 417                 return UBUS_STATUS_INVALID_ARGUMENT;
 418
 419         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 420         if (!up) {
 421                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 422                 return 0;
 423         }
 424
 425         if ((cur = tb[NOTIFY_KEEP]) != NULL)
 426                 keep = blobmsg_get_bool(cur);
 427
 428         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 429                 addr_ext = blobmsg_get_bool(cur);
 430                 if (addr_ext)
 431                         dev_create = 2;
 432         }
 433
 434         if (!tb[NOTIFY_IFNAME]) {
 435                 if (!iface->main_dev.dev)
 436                         return UBUS_STATUS_INVALID_ARGUMENT;
 437         } else if (!keep || iface->state != IFS_UP) {
 438                 keep = false;
 439                 devname = blobmsg_data(tb[NOTIFY_IFNAME]);
 440                 if (tb[NOTIFY_TUNNEL]) {
 441                         dev = proto_shell_create_tunnel(devname,
 442                                 tb[NOTIFY_TUNNEL]);
 443                         if (!dev)
 444                                 return UBUS_STATUS_INVALID_ARGUMENT;
 445                 } else {
 446                         dev = device_get(devname, dev_create);
 447                         if (!dev)
 448                                 return UBUS_STATUS_NOT_FOUND;
 449                 }
 450
 451                 interface_set_l3_dev(iface, dev);
 452                 device_claim(&iface->l3_dev);
 453         }
 454
 455         if (!keep)
 456                 interface_update_start(iface);
 457
 458         proto_apply_ip_settings(iface, data, addr_ext);
 459
 460         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 461                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 462
 463         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 464                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 465
 466         interface_update_complete(state->proto.iface);
 467
 468         if (!keep)
 469                 state->proto.proto_event(&state->proto, IFPEV_UP);
 470         state->sm = S_IDLE;
 471
 472         if ((cur = tb[NOTIFY_DATA]))
 473                 proto_shell_parse_data(state->proto.iface, cur);
 474
 475         return 0;
 476 }
 477
 478 static bool
 479 fill_string_list(struct blob_attr *attr, char **argv, int max)
 480 {
 481         struct blob_attr *cur;
 482         int argc = 0;
 483         int rem;
 484
 485         if (!attr)
 486                 goto out;
 487
 488         blobmsg_for_each_attr(cur, attr, rem) {
 489                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 490                         return false;
 491
 492                 if (!blobmsg_check_attr(cur, NULL))
 493                         return false;
 494
 495                 argv[argc++] = blobmsg_data(cur);
 496                 if (argc == max - 1)
 497                         return false;
 498         }
 499
 500 out:
 501         argv[argc] = NULL;
 502         return true;
 503 }
 504
 505 static int
 506 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 507 {
 508         static char *argv[64];
 509         static char *env[32];
 510
 511         if (!tb[NOTIFY_COMMAND])
 512                 goto error;
 513
 514         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 515                 goto error;
 516
 517         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 518                 goto error;
 519
 520         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 521
 522         return 0;
 523
 524 error:
 525         return UBUS_STATUS_INVALID_ARGUMENT;
 526 }
 527
 528 static int
 529 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 530 {
 531         unsigned int signal = ~0;
 532
 533         if (tb[NOTIFY_SIGNAL])
 534                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 535
 536         if (signal > 31)
 537                 signal = SIGTERM;
 538
 539         if (state->proto_task.uloop.pending) {
 540                 state->proto_task_killed = true;
 541                 kill(state->proto_task.uloop.pid, signal);
 542         }
 543
 544         return 0;
 545 }
 546
 547 static int
 548 proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
 549 {
 550         struct blob_attr *cur;
 551         char *data[16];
 552         int n_data = 0;
 553         int rem;
 554
 555         if (!tb[NOTIFY_ERROR])
 556                 return UBUS_STATUS_INVALID_ARGUMENT;
 557
 558         blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
 559                 if (n_data + 1 == ARRAY_SIZE(data))
 560                         goto error;
 561
 562                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 563                         goto error;
 564
 565                 if (!blobmsg_check_attr(cur, NULL))
 566                         goto error;
 567
 568                 data[n_data++] = blobmsg_data(cur);
 569         }
 570
 571         if (!n_data)
 572                 goto error;
 573
 574         interface_add_error(state->proto.iface, state->handler->proto.name,
 575                         data[0], (const char **) &data[1], n_data - 1);
 576
 577         return 0;
 578
 579 error:
 580         return UBUS_STATUS_INVALID_ARGUMENT;
 581 }
 582
 583 static int
 584 proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
 585 {
 586         state->proto.iface->autostart = false;
 587         return 0;
 588 }
 589
 590 static int
 591 proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
 592 {
 593         if (!tb[NOTIFY_AVAILABLE])
 594                 return UBUS_STATUS_INVALID_ARGUMENT;
 595
 596         interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
 597         return 0;
 598 }
 599
 600 static int
 601 proto_shell_add_host_dependency(struct proto_shell_state *state, struct blob_attr **tb)
 602 {
 603         struct proto_shell_dependency *dep;
 604         struct blob_attr *host = tb[NOTIFY_HOST];
 605
 606         if (!host)
 607                 return UBUS_STATUS_INVALID_ARGUMENT;
 608
 609         dep = calloc(1, sizeof(*dep));
 610         if (!inet_pton(AF_INET, blobmsg_data(host), &dep->host)) {
 611                 free(dep);
 612                 return UBUS_STATUS_INVALID_ARGUMENT;
 613         }
 614
 615         dep->proto = state;
 616         dep->dep.cb = proto_shell_if_up_cb;
 617         interface_add_user(&dep->dep, NULL);
 618         list_add(&dep->list, &state->deps);
 619         proto_shell_update_host_dep(dep);
 620         if (!dep->dep.iface)
 621                 return UBUS_STATUS_NOT_FOUND;
 622
 623         return 0;
 624 }
 625
 626 static int
 627 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 628 {
 629         struct proto_shell_state *state;
 630         struct blob_attr *tb[__NOTIFY_LAST];
 631
 632         state = container_of(proto, struct proto_shell_state, proto);
 633
 634         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 635         if (!tb[NOTIFY_ACTION])
 636                 return UBUS_STATUS_INVALID_ARGUMENT;
 637
 638         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 639         case 0:
 640                 return proto_shell_update_link(state, attr, tb);
 641         case 1:
 642                 return proto_shell_run_command(state, tb);
 643         case 2:
 644                 return proto_shell_kill_command(state, tb);
 645         case 3:
 646                 return proto_shell_notify_error(state, tb);
 647         case 4:
 648                 return proto_shell_block_restart(state, tb);
 649         case 5:
 650                 return proto_shell_set_available(state, tb);
 651         case 6:
 652                 return proto_shell_add_host_dependency(state, tb);
 653         default:
 654                 return UBUS_STATUS_INVALID_ARGUMENT;
 655         }
 656 }
 657
 658 static struct interface_proto_state *
 659 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 660                    struct blob_attr *attr)
 661 {
 662         struct proto_shell_state *state;
 663
 664         state = calloc(1, sizeof(*state));
 665         INIT_LIST_HEAD(&state->deps);
 666
 667         state->config = malloc(blob_pad_len(attr));
 668         if (!state->config)
 669                 goto error;
 670
 671         memcpy(state->config, attr, blob_pad_len(attr));
 672         state->proto.free = proto_shell_free;
 673         state->proto.notify = proto_shell_notify;
 674         state->proto.cb = proto_shell_handler;
 675         state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
 676         state->script_task.cb = proto_shell_script_cb;
 677         state->script_task.dir_fd = proto_fd.fd;
 678         state->script_task.log_prefix = iface->name;
 679         state->proto_task.cb = proto_shell_task_cb;
 680         state->proto_task.dir_fd = proto_fd.fd;
 681         state->proto_task.log_prefix = iface->name;
 682         state->handler = container_of(h, struct proto_shell_handler, proto);
 683
 684         return &state->proto;
 685
 686 error:
 687         free(state);
 688         return NULL;
 689 }
 690
 691 static json_object *
 692 check_type(json_object *obj, json_type type)
 693 {
 694         if (!obj)
 695                 return NULL;
 696
 697         if (json_object_get_type(obj) != type)
 698                 return NULL;
 699
 700         return obj;
 701 }
 702
 703 static inline json_object *
 704 get_field(json_object *obj, const char *name, json_type type)
 705 {
 706         return check_type(json_object_object_get(obj, name), type);
 707 }
 708
 709 static char *
 710 proto_shell_parse_config(struct config_param_list *config, json_object *obj)
 711 {
 712         struct blobmsg_policy *attrs;
 713         char *str_buf, *str_cur;
 714         int str_len = 0;
 715         int i;
 716
 717         config->n_params = json_object_array_length(obj);
 718         attrs = calloc(1, sizeof(*attrs) * config->n_params);
 719         if (!attrs)
 720                 return NULL;
 721
 722         config->params = attrs;
 723         for (i = 0; i < config->n_params; i++) {
 724                 json_object *cur, *name, *type;
 725
 726                 cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
 727                 if (!cur)
 728                         goto error;
 729
 730                 name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
 731                 if (!name)
 732                         goto error;
 733
 734                 type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
 735                 if (!type)
 736                         goto error;
 737
 738                 attrs[i].name = json_object_get_string(name);
 739                 attrs[i].type = json_object_get_int(type);
 740                 if (attrs[i].type > BLOBMSG_TYPE_LAST)
 741                         goto error;
 742
 743                 str_len += strlen(attrs[i].name) + 1;
 744         }
 745
 746         str_buf = malloc(str_len);
 747         if (!str_buf)
 748                 goto error;
 749
 750         str_cur = str_buf;
 751         for (i = 0; i < config->n_params; i++) {
 752                 const char *name = attrs[i].name;
 753
 754                 attrs[i].name = str_cur;
 755                 str_cur += sprintf(str_cur, "%s", name) + 1;
 756         }
 757
 758         return str_buf;
 759
 760 error:
 761         free(attrs);
 762         config->n_params = 0;
 763         return NULL;
 764 }
 765
 766 static void
 767 proto_shell_add_handler(const char *script, json_object *obj)
 768 {
 769         struct proto_shell_handler *handler;
 770         struct proto_handler *proto;
 771         json_object *config, *tmp;
 772         const char *name;
 773         char *str;
 774
 775         if (!check_type(obj, json_type_object))
 776                 return;
 777
 778         tmp = get_field(obj, "name", json_type_string);
 779         if (!tmp)
 780                 return;
 781
 782         name = json_object_get_string(tmp);
 783
 784         handler = calloc(1, sizeof(*handler) +
 785                          strlen(script) + 1 +
 786                          strlen(name) + 1);
 787         if (!handler)
 788                 return;
 789
 790         strcpy(handler->script_name, script);
 791
 792         str = handler->script_name + strlen(handler->script_name) + 1;
 793         strcpy(str, name);
 794
 795         proto = &handler->proto;
 796         proto->name = str;
 797         proto->config_params = &handler->config;
 798         proto->attach = proto_shell_attach;
 799
 800         tmp = get_field(obj, "no-device", json_type_boolean);
 801         if (tmp && json_object_get_boolean(tmp))
 802                 handler->proto.flags |= PROTO_FLAG_NODEV;
 803
 804         tmp = get_field(obj, "available", json_type_boolean);
 805         if (tmp && json_object_get_boolean(tmp))
 806                 handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
 807
 808         config = get_field(obj, "config", json_type_array);
 809         if (config)
 810                 handler->config_buf = proto_shell_parse_config(&handler->config, config);
 811
 812         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 813         add_proto_handler(proto);
 814 }
 815
 816 static void proto_shell_add_script(const char *name)
 817 {
 818         struct json_tokener *tok = NULL;
 819         json_object *obj;
 820         static char buf[512];
 821         char *start, *cmd;
 822         FILE *f;
 823         int len;
 824
 825 #define DUMP_SUFFIX     " '' dump"
 826
 827         cmd = alloca(strlen(name) + 1 + sizeof(DUMP_SUFFIX));
 828         sprintf(cmd, "%s" DUMP_SUFFIX, name);
 829
 830         f = popen(cmd, "r");
 831         if (!f)
 832                 return;
 833
 834         do {
 835                 start = fgets(buf, sizeof(buf), f);
 836                 if (!start)
 837                         continue;
 838
 839                 len = strlen(start);
 840
 841                 if (!tok)
 842                         tok = json_tokener_new();
 843
 844                 obj = json_tokener_parse_ex(tok, start, len);
 845                 if (!is_error(obj)) {
 846                         proto_shell_add_handler(name, obj);
 847                         json_object_put(obj);
 848                         json_tokener_free(tok);
 849                         tok = NULL;
 850                 } else if (start[len - 1] == '\n') {
 851                         json_tokener_free(tok);
 852                         tok = NULL;
 853                 }
 854         } while (!feof(f) && !ferror(f));
 855
 856         if (tok)
 857                 json_tokener_free(tok);
 858
 859         pclose(f);
 860 }
 861
 862 static void __init proto_shell_init(void)
 863 {
 864         glob_t g;
 865         int main_fd;
 866         int i;
 867
 868         main_fd = open(".", O_RDONLY | O_DIRECTORY);
 869         if (main_fd < 0)
 870                 return;
 871
 872         if (chdir(main_path)) {
 873                 perror("chdir(main path)");
 874                 goto close_cur;
 875         }
 876
 877         if (chdir("./proto"))
 878                 goto close_cur;
 879
 880         proto_fd.fd = open(".", O_RDONLY | O_DIRECTORY);
 881         if (proto_fd.fd < 0)
 882                 goto close_cur;
 883
 884         netifd_fd_add(&proto_fd);
 885         glob("./*.sh", 0, NULL, &g);
 886         for (i = 0; i < g.gl_pathc; i++)
 887                 proto_shell_add_script(g.gl_pathv[i]);
 888
 889 close_cur:
 890         fchdir(main_fd);
 891         close(main_fd);
 892 }