proto-shell.c

   1 #define _GNU_SOURCE
   2
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <glob.h>
   7 #include <unistd.h>
   8 #include <fcntl.h>
   9 #include <signal.h>
  10
  11 #include <arpa/inet.h>
  12 #include <netinet/in.h>
  13
  14 #include <libubox/blobmsg_json.h>
  15
  16 #include "netifd.h"
  17 #include "interface.h"
  18 #include "interface-ip.h"
  19 #include "proto.h"
  20
  21 static struct netifd_fd proto_fd;
  22
  23 struct proto_shell_handler {
  24         struct list_head list;
  25         struct proto_handler proto;
  26         struct config_param_list config;
  27         char *config_buf;
  28         char script_name[];
  29 };
  30
  31 struct proto_shell_state {
  32         struct interface_proto_state proto;
  33         struct proto_shell_handler *handler;
  34         struct blob_attr *config;
  35
  36         struct device_user l3_dev;
  37
  38         struct uloop_timeout setup_timeout;
  39         struct netifd_process setup_task;
  40         struct netifd_process teardown_task;
  41         bool teardown_pending;
  42         bool teardown_wait_task;
  43
  44         struct netifd_process proto_task;
  45         int last_error;
  46 };
  47
  48 static int
  49 proto_shell_handler(struct interface_proto_state *proto,
  50                     enum interface_proto_cmd cmd, bool force)
  51 {
  52         struct proto_shell_state *state;
  53         struct proto_shell_handler *handler;
  54         struct netifd_process *proc;
  55         static char error_buf[32];
  56         const char *argv[7];
  57         char *envp[2];
  58         const char *action;
  59         char *config;
  60         int ret, i = 0, j = 0;
  61
  62         state = container_of(proto, struct proto_shell_state, proto);
  63         handler = state->handler;
  64
  65         if (cmd == PROTO_CMD_SETUP) {
  66                 action = "setup";
  67                 proc = &state->setup_task;
  68                 state->last_error = -1;
  69         } else {
  70                 action = "teardown";
  71                 proc = &state->teardown_task;
  72                 if (state->setup_task.uloop.pending && !state->teardown_wait_task) {
  73                         uloop_timeout_set(&state->setup_timeout, 1000);
  74                         kill(state->setup_task.uloop.pid, SIGTERM);
  75                         state->teardown_pending = true;
  76                         return 0;
  77                 }
  78                 if (state->last_error >= 0) {
  79                         snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
  80                         envp[j++] = error_buf;
  81                 }
  82         }
  83
  84         config = blobmsg_format_json(state->config, true);
  85         if (!config)
  86                 return -1;
  87
  88         argv[i++] = handler->script_name;
  89         argv[i++] = handler->proto.name;
  90         argv[i++] = action;
  91         argv[i++] = proto->iface->name;
  92         argv[i++] = config;
  93         if (proto->iface->main_dev.dev)
  94                 argv[i++] = proto->iface->main_dev.dev->ifname;
  95         argv[i] = NULL;
  96         envp[j] = NULL;
  97
  98         ret = netifd_start_process(argv, envp, proc);
  99         free(config);
 100
 101         return ret;
 102 }
 103
 104 static void
 105 proto_shell_setup_timeout_cb(struct uloop_timeout *timeout)
 106 {
 107         struct proto_shell_state *state;
 108
 109         state = container_of(timeout, struct proto_shell_state, setup_timeout);
 110         kill(state->setup_task.uloop.pid, SIGKILL);
 111 }
 112
 113 static void
 114 proto_shell_setup_cb(struct netifd_process *p, int ret)
 115 {
 116         struct proto_shell_state *state;
 117
 118         state = container_of(p, struct proto_shell_state, setup_task);
 119         uloop_timeout_cancel(&state->setup_timeout);
 120         if (state->teardown_pending) {
 121                 state->teardown_pending = false;
 122                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 123         }
 124 }
 125
 126 static void
 127 proto_shell_teardown_cb(struct netifd_process *p, int ret)
 128 {
 129         struct proto_shell_state *state;
 130
 131         state = container_of(p, struct proto_shell_state, teardown_task);
 132
 133         if (state->teardown_wait_task)
 134                 return;
 135
 136         netifd_kill_process(&state->proto_task);
 137         state->proto.proto_event(&state->proto, IFPEV_DOWN);
 138 }
 139
 140 static void
 141 proto_shell_task_cb(struct netifd_process *p, int ret)
 142 {
 143         struct proto_shell_state *state;
 144         bool teardown_wait_task;
 145
 146         state = container_of(p, struct proto_shell_state, proto_task);
 147
 148         teardown_wait_task = state->teardown_wait_task;
 149         state->teardown_wait_task = false;
 150         if (state->teardown_pending || state->teardown_task.uloop.pending)
 151                 return;
 152
 153         if (teardown_wait_task) {
 154                 proto_shell_teardown_cb(&state->teardown_task, 0);
 155                 return;
 156         }
 157
 158         state->last_error = ret;
 159         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 160         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 161 }
 162
 163 static void
 164 proto_shell_free(struct interface_proto_state *proto)
 165 {
 166         struct proto_shell_state *state;
 167
 168         state = container_of(proto, struct proto_shell_state, proto);
 169         free(state->config);
 170         free(state);
 171 }
 172
 173 static void
 174 proto_shell_parse_addr_list(struct interface_ip_settings *ip, struct blob_attr *attr,
 175                             bool v6, bool external)
 176 {
 177         struct device_addr *addr;
 178         struct blob_attr *cur;
 179         int rem;
 180
 181         blobmsg_for_each_attr(cur, attr, rem) {
 182                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING) {
 183                         DPRINTF("Ignore wrong address type: %d\n", blobmsg_type(cur));
 184                         continue;
 185                 }
 186
 187                 addr = proto_parse_ip_addr_string(blobmsg_data(cur), v6, v6 ? 32 : 128);
 188                 if (!addr) {
 189                         DPRINTF("Failed to parse IP address string: %s\n", (char *) blobmsg_data(cur));
 190                         continue;
 191                 }
 192
 193                 if (external)
 194                         addr->flags |= DEVADDR_EXTERNAL;
 195
 196                 vlist_add(&ip->addr, &addr->node);
 197         }
 198 }
 199
 200 static void
 201 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 202                              bool v6)
 203 {
 204         struct blob_attr *cur;
 205         int rem;
 206
 207         blobmsg_for_each_attr(cur, attr, rem) {
 208                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 209                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 210                         continue;
 211                 }
 212
 213                 interface_ip_add_route(iface, cur, v6);
 214         }
 215 }
 216
 217 enum {
 218         NOTIFY_ACTION,
 219         NOTIFY_COMMAND,
 220         NOTIFY_ENV,
 221         NOTIFY_SIGNAL,
 222         NOTIFY_LINK_UP,
 223         NOTIFY_IFNAME,
 224         NOTIFY_ADDR_EXT,
 225         NOTIFY_IPADDR,
 226         NOTIFY_IP6ADDR,
 227         NOTIFY_ROUTES,
 228         NOTIFY_ROUTES6,
 229         NOTIFY_DNS,
 230         NOTIFY_DNS_SEARCH,
 231         __NOTIFY_LAST
 232 };
 233
 234 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 235         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 236         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 237         [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
 238         [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
 239         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 240         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 241         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 242         [NOTIFY_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
 243         [NOTIFY_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
 244         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 245         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 246         [NOTIFY_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 247         [NOTIFY_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
 248 };
 249
 250 static int
 251 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr **tb)
 252 {
 253         struct interface_ip_settings *ip;
 254         struct blob_attr *cur;
 255         int dev_create = 1;
 256         bool addr_ext = false;
 257         bool up;
 258
 259         if (!tb[NOTIFY_LINK_UP])
 260                 return UBUS_STATUS_INVALID_ARGUMENT;
 261
 262         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 263         if (!up) {
 264                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 265                 return 0;
 266         }
 267
 268         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL) {
 269                 addr_ext = blobmsg_get_bool(cur);
 270                 if (addr_ext)
 271                         dev_create = 2;
 272         }
 273
 274         if (!tb[NOTIFY_IFNAME]) {
 275                 if (!state->proto.iface->main_dev.dev)
 276                         return UBUS_STATUS_INVALID_ARGUMENT;
 277         } else {
 278                 if (state->l3_dev.dev)
 279                         device_remove_user(&state->l3_dev);
 280
 281                 device_add_user(&state->l3_dev,
 282                         device_get(blobmsg_data(tb[NOTIFY_IFNAME]), dev_create));
 283                 state->proto.iface->l3_dev = &state->l3_dev;
 284                 device_claim(&state->l3_dev);
 285         }
 286
 287         ip = &state->proto.iface->proto_ip;
 288         interface_update_start(state->proto.iface);
 289
 290         if ((cur = tb[NOTIFY_IPADDR]) != NULL)
 291                 proto_shell_parse_addr_list(ip, cur, false, addr_ext);
 292
 293         if ((cur = tb[NOTIFY_IP6ADDR]) != NULL)
 294                 proto_shell_parse_addr_list(ip, cur, true, addr_ext);
 295
 296         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 297                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 298
 299         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 300                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 301
 302         if ((cur = tb[NOTIFY_DNS]) != NULL)
 303                 interface_add_dns_server_list(ip, cur);
 304
 305         if ((cur = tb[NOTIFY_DNS_SEARCH]) != NULL)
 306                 interface_add_dns_search_list(ip, cur);
 307
 308         interface_update_complete(state->proto.iface);
 309
 310         state->proto.proto_event(&state->proto, IFPEV_UP);
 311
 312         return 0;
 313 }
 314
 315 static bool
 316 fill_string_list(struct blob_attr *attr, char **argv, int max)
 317 {
 318         struct blob_attr *cur;
 319         int argc = 0;
 320         int rem;
 321
 322         if (!attr)
 323                 goto out;
 324
 325         blobmsg_for_each_attr(cur, attr, rem) {
 326                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 327                         return false;
 328
 329                 if (!blobmsg_check_attr(cur, NULL))
 330                         return false;
 331
 332                 argv[argc++] = blobmsg_data(cur);
 333                 if (argc == max - 1)
 334                         return false;
 335         }
 336
 337 out:
 338         argv[argc] = NULL;
 339         return true;
 340 }
 341
 342 static int
 343 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 344 {
 345         static char *argv[64];
 346         static char *env[32];
 347
 348         if (!tb[NOTIFY_COMMAND])
 349                 goto error;
 350
 351         if (!fill_string_list(tb[NOTIFY_COMMAND], argv, ARRAY_SIZE(argv)))
 352                 goto error;
 353
 354         if (!fill_string_list(tb[NOTIFY_ENV], env, ARRAY_SIZE(env)))
 355                 goto error;
 356
 357         netifd_start_process((const char **) argv, (char **) env, &state->proto_task);
 358
 359         return 0;
 360
 361 error:
 362         return UBUS_STATUS_INVALID_ARGUMENT;
 363 }
 364
 365 static int
 366 proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
 367 {
 368         unsigned int signal = ~0;
 369
 370         if (tb[NOTIFY_SIGNAL])
 371                 signal = blobmsg_get_u32(tb[NOTIFY_SIGNAL]);
 372
 373         if (signal > 31)
 374                 signal = SIGTERM;
 375
 376         if (state->proto_task.uloop.pending) {
 377                 kill(state->proto_task.uloop.pid, signal);
 378                 state->teardown_wait_task = true;
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int
 385 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 386 {
 387         struct proto_shell_state *state;
 388         struct blob_attr *tb[__NOTIFY_LAST];
 389
 390         state = container_of(proto, struct proto_shell_state, proto);
 391
 392         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 393         if (!tb[NOTIFY_ACTION])
 394                 return UBUS_STATUS_INVALID_ARGUMENT;
 395
 396         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 397         case 0:
 398                 return proto_shell_update_link(state, tb);
 399         case 1:
 400                 return proto_shell_run_command(state, tb);
 401         case 2:
 402                 return proto_shell_kill_command(state, tb);
 403         default:
 404                 return UBUS_STATUS_INVALID_ARGUMENT;
 405         }
 406 }
 407
 408 static struct interface_proto_state *
 409 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 410                    struct blob_attr *attr)
 411 {
 412         struct proto_shell_state *state;
 413
 414         state = calloc(1, sizeof(*state));
 415         state->config = malloc(blob_pad_len(attr));
 416         if (!state->config)
 417                 goto error;
 418
 419         memcpy(state->config, attr, blob_pad_len(attr));
 420         state->proto.free = proto_shell_free;
 421         state->proto.notify = proto_shell_notify;
 422         state->proto.cb = proto_shell_handler;
 423         state->setup_timeout.cb = proto_shell_setup_timeout_cb;
 424         state->setup_task.cb = proto_shell_setup_cb;
 425         state->setup_task.dir_fd = proto_fd.fd;
 426         state->setup_task.log_prefix = iface->name;
 427         state->teardown_task.cb = proto_shell_teardown_cb;
 428         state->teardown_task.dir_fd = proto_fd.fd;
 429         state->teardown_task.log_prefix = iface->name;
 430         state->proto_task.cb = proto_shell_task_cb;
 431         state->proto_task.dir_fd = proto_fd.fd;
 432         state->proto_task.log_prefix = iface->name;
 433         state->handler = container_of(h, struct proto_shell_handler, proto);
 434
 435         return &state->proto;
 436
 437 error:
 438         free(state);
 439         return NULL;
 440 }
 441
 442 static json_object *
 443 check_type(json_object *obj, json_type type)
 444 {
 445         if (!obj)
 446                 return NULL;
 447
 448         if (json_object_get_type(obj) != type)
 449                 return NULL;
 450
 451         return obj;
 452 }
 453
 454 static inline json_object *
 455 get_field(json_object *obj, const char *name, json_type type)
 456 {
 457         return check_type(json_object_object_get(obj, name), type);
 458 }
 459
 460 static char *
 461 proto_shell_parse_config(struct config_param_list *config, json_object *obj)
 462 {
 463         struct blobmsg_policy *attrs;
 464         char *str_buf, *str_cur;
 465         int str_len = 0;
 466         int i;
 467
 468         config->n_params = json_object_array_length(obj);
 469         attrs = calloc(1, sizeof(*attrs) * config->n_params);
 470         if (!attrs)
 471                 return NULL;
 472
 473         config->params = attrs;
 474         for (i = 0; i < config->n_params; i++) {
 475                 json_object *cur, *name, *type;
 476
 477                 cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
 478                 if (!cur)
 479                         goto error;
 480
 481                 name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
 482                 if (!name)
 483                         goto error;
 484
 485                 type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
 486                 if (!type)
 487                         goto error;
 488
 489                 attrs[i].name = json_object_get_string(name);
 490                 attrs[i].type = json_object_get_int(type);
 491                 if (attrs[i].type > BLOBMSG_TYPE_LAST)
 492                         goto error;
 493
 494                 str_len += strlen(attrs[i].name) + 1;
 495         }
 496
 497         str_buf = malloc(str_len);
 498         if (!str_buf)
 499                 goto error;
 500
 501         str_cur = str_buf;
 502         for (i = 0; i < config->n_params; i++) {
 503                 const char *name = attrs[i].name;
 504
 505                 attrs[i].name = str_cur;
 506                 str_cur += sprintf(str_cur, "%s", name) + 1;
 507         }
 508
 509         return str_buf;
 510
 511 error:
 512         free(attrs);
 513         config->n_params = 0;
 514         return NULL;
 515 }
 516
 517 static void
 518 proto_shell_add_handler(const char *script, json_object *obj)
 519 {
 520         struct proto_shell_handler *handler;
 521         struct proto_handler *proto;
 522         json_object *config, *tmp;
 523         const char *name;
 524         char *str;
 525
 526         if (!check_type(obj, json_type_object))
 527                 return;
 528
 529         tmp = get_field(obj, "name", json_type_string);
 530         if (!tmp)
 531                 return;
 532
 533         name = json_object_get_string(tmp);
 534
 535         handler = calloc(1, sizeof(*handler) +
 536                          strlen(script) + 1 +
 537                          strlen(name) + 1);
 538         if (!handler)
 539                 return;
 540
 541         strcpy(handler->script_name, script);
 542
 543         str = handler->script_name + strlen(handler->script_name) + 1;
 544         strcpy(str, name);
 545
 546         proto = &handler->proto;
 547         proto->name = str;
 548         proto->config_params = &handler->config;
 549         proto->attach = proto_shell_attach;
 550
 551         tmp = get_field(obj, "no-device", json_type_boolean);
 552         if (tmp && json_object_get_boolean(tmp))
 553                 handler->proto.flags |= PROTO_FLAG_NODEV;
 554
 555         config = get_field(obj, "config", json_type_array);
 556         if (config)
 557                 handler->config_buf = proto_shell_parse_config(&handler->config, config);
 558
 559         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 560         add_proto_handler(proto);
 561 }
 562
 563 static void proto_shell_add_script(const char *name)
 564 {
 565         struct json_tokener *tok = NULL;
 566         json_object *obj;
 567         static char buf[512];
 568         char *start, *cmd;
 569         FILE *f;
 570         int len;
 571
 572 #define DUMP_SUFFIX     " '' dump"
 573
 574         cmd = alloca(strlen(name) + 1 + sizeof(DUMP_SUFFIX));
 575         sprintf(cmd, "%s" DUMP_SUFFIX, name);
 576
 577         f = popen(cmd, "r");
 578         if (!f)
 579                 return;
 580
 581         do {
 582                 start = fgets(buf, sizeof(buf), f);
 583                 if (!start)
 584                         continue;
 585
 586                 len = strlen(start);
 587
 588                 if (!tok)
 589                         tok = json_tokener_new();
 590
 591                 obj = json_tokener_parse_ex(tok, start, len);
 592                 if (!is_error(obj)) {
 593                         proto_shell_add_handler(name, obj);
 594                         json_object_put(obj);
 595                         json_tokener_free(tok);
 596                         tok = NULL;
 597                 } else if (start[len - 1] == '\n') {
 598                         json_tokener_free(tok);
 599                         tok = NULL;
 600                 }
 601         } while (!feof(f) && !ferror(f));
 602
 603         if (tok)
 604                 json_tokener_free(tok);
 605
 606         pclose(f);
 607 }
 608
 609 static void __init proto_shell_init(void)
 610 {
 611         glob_t g;
 612         int main_fd;
 613         int i;
 614
 615         main_fd = open(".", O_RDONLY | O_DIRECTORY);
 616         if (main_fd < 0)
 617                 return;
 618
 619         if (chdir(main_path)) {
 620                 perror("chdir(main path)");
 621                 goto close_cur;
 622         }
 623
 624         if (chdir("./proto"))
 625                 goto close_cur;
 626
 627         proto_fd.fd = open(".", O_RDONLY | O_DIRECTORY);
 628         if (proto_fd.fd < 0)
 629                 goto close_cur;
 630
 631         netifd_fd_add(&proto_fd);
 632         glob("./*.sh", 0, NULL, &g);
 633         for (i = 0; i < g.gl_pathc; i++)
 634                 proto_shell_add_script(g.gl_pathv[i]);
 635
 636 close_cur:
 637         fchdir(main_fd);
 638         close(main_fd);
 639 }