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 int 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 uloop_process setup_task;
  40         struct uloop_process teardown_task;
  41         bool teardown_pending;
  42
  43         struct uloop_process proto_task;
  44 };
  45
  46 static void
  47 kill_process(struct uloop_process *proc)
  48 {
  49         if (!proc->pending)
  50                 return;
  51
  52         kill(proc->pid, SIGTERM);
  53         uloop_process_delete(proc);
  54 }
  55
  56 static int
  57 start_process(const char **argv, struct uloop_process *proc)
  58 {
  59         int pid;
  60
  61         kill_process(proc);
  62
  63         if ((pid = fork()) < 0)
  64                 return -1;
  65
  66         if (!pid) {
  67                 fchdir(proto_fd);
  68                 execvp(argv[0], (char **) argv);
  69                 exit(127);
  70         }
  71
  72         if (pid < 0)
  73                 return -1;
  74
  75         proc->pid = pid;
  76         uloop_process_add(proc);
  77
  78         return 0;
  79 }
  80
  81 static int
  82 proto_shell_handler(struct interface_proto_state *proto,
  83                     enum interface_proto_cmd cmd, bool force)
  84 {
  85         struct proto_shell_state *state;
  86         struct proto_shell_handler *handler;
  87         struct uloop_process *proc;
  88         const char *argv[6];
  89         const char *action;
  90         char *config;
  91         int ret, i = 0;
  92
  93         state = container_of(proto, struct proto_shell_state, proto);
  94         handler = state->handler;
  95
  96         if (cmd == PROTO_CMD_SETUP) {
  97                 action = "setup";
  98                 proc = &state->setup_task;
  99         } else {
 100                 action = "teardown";
 101                 proc = &state->teardown_task;
 102                 if (state->setup_task.pending) {
 103                         uloop_timeout_set(&state->setup_timeout, 1000);
 104                         kill(state->setup_task.pid, SIGINT);
 105                         state->teardown_pending = true;
 106                         return 0;
 107                 }
 108         }
 109
 110         config = blobmsg_format_json(state->config, true);
 111         if (!config)
 112                 return -1;
 113
 114         argv[i++] = handler->script_name;
 115         argv[i++] = handler->proto.name;
 116         argv[i++] = action;
 117         argv[i++] = proto->iface->name;
 118         argv[i++] = config;
 119         if (proto->iface->main_dev.dev)
 120                 argv[i++] = proto->iface->main_dev.dev->ifname;
 121         argv[i] = NULL;
 122
 123         ret = start_process(argv, proc);
 124         free(config);
 125
 126         return ret;
 127 }
 128
 129 static void
 130 proto_shell_setup_timeout_cb(struct uloop_timeout *timeout)
 131 {
 132         struct proto_shell_state *state;
 133
 134         state = container_of(timeout, struct proto_shell_state, setup_timeout);
 135         kill(state->setup_task.pid, SIGKILL);
 136 }
 137
 138 static void
 139 proto_shell_setup_cb(struct uloop_process *p, int ret)
 140 {
 141         struct proto_shell_state *state;
 142
 143         state = container_of(p, struct proto_shell_state, setup_task);
 144         uloop_timeout_cancel(&state->setup_timeout);
 145         if (state->teardown_pending) {
 146                 state->teardown_pending = false;
 147                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 148         }
 149 }
 150
 151 static void
 152 proto_shell_teardown_cb(struct uloop_process *p, int ret)
 153 {
 154         struct proto_shell_state *state;
 155
 156         state = container_of(p, struct proto_shell_state, teardown_task);
 157
 158         kill_process(&state->proto_task);
 159
 160         if (state->l3_dev.dev)
 161                 device_remove_user(&state->l3_dev);
 162
 163         state->proto.proto_event(&state->proto, IFPEV_DOWN);
 164 }
 165
 166 static void
 167 proto_shell_task_cb(struct uloop_process *p, int ret)
 168 {
 169         struct proto_shell_state *state;
 170
 171         state = container_of(p, struct proto_shell_state, proto_task);
 172         if (state->teardown_pending || state->teardown_task.pending)
 173                 return;
 174
 175         state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 176         proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 177 }
 178
 179 static void
 180 proto_shell_free(struct interface_proto_state *proto)
 181 {
 182         struct proto_shell_state *state;
 183
 184         state = container_of(proto, struct proto_shell_state, proto);
 185         free(state->config);
 186         free(state);
 187 }
 188
 189 static void
 190 proto_shell_parse_addr_list(struct interface *iface, struct blob_attr *attr,
 191                             bool v6, bool external)
 192 {
 193         struct device_addr *addr;
 194         struct blob_attr *cur;
 195         int rem;
 196
 197         blobmsg_for_each_attr(cur, attr, rem) {
 198                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING) {
 199                         DPRINTF("Ignore wrong address type: %d\n", blobmsg_type(cur));
 200                         continue;
 201                 }
 202
 203                 addr = proto_parse_ip_addr_string(blobmsg_data(cur), v6, v6 ? 32 : 128);
 204                 if (!addr) {
 205                         DPRINTF("Failed to parse IP address string: %s\n", (char *) blobmsg_data(cur));
 206                         continue;
 207                 }
 208
 209                 if (external)
 210                         addr->flags |= DEVADDR_EXTERNAL;
 211
 212                 vlist_add(&iface->proto_addr, &addr->node);
 213         }
 214 }
 215
 216 enum {
 217         ROUTE_TARGET,
 218         ROUTE_MASK,
 219         ROUTE_GATEWAY,
 220         ROUTE_DEVICE,
 221         __ROUTE_LAST
 222 };
 223
 224 static const struct blobmsg_policy route_attr[__ROUTE_LAST] = {
 225         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 226         [ROUTE_MASK] = { .name = "mask", .type = BLOBMSG_TYPE_INT32 },
 227         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
 228         [ROUTE_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 229 };
 230
 231 static void
 232 parse_route(struct interface *iface, struct blob_attr *attr, bool v6)
 233 {
 234         struct blob_attr *tb[__ROUTE_LAST], *cur;
 235         struct device_route *route;
 236         int af = v6 ? AF_INET6 : AF_INET;
 237
 238         blobmsg_parse(route_attr, __ROUTE_LAST, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 239
 240         if (!tb[ROUTE_GATEWAY] && !tb[ROUTE_DEVICE])
 241                 return;
 242
 243         route = calloc(1, sizeof(*route));
 244         if (!route)
 245                 return;
 246
 247         route->mask = v6 ? 128 : 32;
 248         if ((cur = tb[ROUTE_MASK]) != NULL) {
 249                 route->mask = blobmsg_get_u32(cur);
 250                 if (route->mask > v6 ? 128 : 32)
 251                         goto error;
 252         }
 253
 254         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 255                 if (!inet_pton(af, blobmsg_data(cur), &route->addr)) {
 256                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 257                         goto error;
 258                 }
 259         }
 260
 261         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 262                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 263                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 264                         goto error;
 265                 }
 266         }
 267
 268         if ((cur = tb[ROUTE_DEVICE]) != NULL)
 269                 route->device = device_get(blobmsg_data(cur), true);
 270
 271         vlist_add(&iface->proto_route, &route->node);
 272         return;
 273
 274 error:
 275         free(route);
 276 }
 277
 278 static void
 279 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 280                              bool v6)
 281 {
 282         struct blob_attr *cur;
 283         int rem;
 284
 285         blobmsg_for_each_attr(cur, attr, rem) {
 286                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 287                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 288                         continue;
 289                 }
 290
 291                 parse_route(iface, cur, v6);
 292         }
 293 }
 294
 295
 296 enum {
 297         NOTIFY_ACTION,
 298         NOTIFY_COMMAND,
 299         NOTIFY_LINK_UP,
 300         NOTIFY_IFNAME,
 301         NOTIFY_ADDR_EXT,
 302         NOTIFY_IPADDR,
 303         NOTIFY_IP6ADDR,
 304         NOTIFY_ROUTES,
 305         NOTIFY_ROUTES6,
 306         __NOTIFY_LAST
 307 };
 308
 309 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 310         [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
 311         [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
 312         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 313         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 314         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 315         [NOTIFY_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
 316         [NOTIFY_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
 317         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 318         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 319 };
 320
 321 static int
 322 proto_shell_update_link(struct proto_shell_state *state, struct blob_attr **tb)
 323 {
 324         struct blob_attr *cur;
 325         bool addr_ext = false;
 326         bool up;
 327
 328         if (!tb[NOTIFY_LINK_UP])
 329                 return UBUS_STATUS_INVALID_ARGUMENT;
 330
 331         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 332         if (up) {
 333                 if (!tb[NOTIFY_IFNAME])
 334                         return UBUS_STATUS_INVALID_ARGUMENT;
 335
 336                 if (!state->l3_dev.dev) {
 337                         device_add_user(&state->l3_dev,
 338                                 device_get(blobmsg_data(tb[NOTIFY_IFNAME]), true));
 339                         device_claim(&state->l3_dev);
 340                         state->proto.iface->l3_dev = &state->l3_dev;
 341                 }
 342                 state->proto.proto_event(&state->proto, IFPEV_UP);
 343         } else {
 344                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 345         }
 346
 347         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL)
 348                 addr_ext = blobmsg_get_bool(cur);
 349
 350         if ((cur = tb[NOTIFY_IPADDR]) != NULL)
 351                 proto_shell_parse_addr_list(state->proto.iface, cur, false, addr_ext);
 352
 353         if ((cur = tb[NOTIFY_IP6ADDR]) != NULL)
 354                 proto_shell_parse_addr_list(state->proto.iface, cur, true, addr_ext);
 355
 356         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 357                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 358
 359         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 360                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 361
 362         return 0;
 363 }
 364
 365 static int
 366 proto_shell_run_command(struct proto_shell_state *state, struct blob_attr **tb)
 367 {
 368         struct blob_attr *cur;
 369         char *argv[64];
 370         int argc = 0;
 371         int rem;
 372
 373         if (!tb[NOTIFY_COMMAND])
 374                 goto error;
 375
 376         blobmsg_for_each_attr(cur, tb[NOTIFY_COMMAND], rem) {
 377                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 378                         goto error;
 379
 380                 if (!blobmsg_check_attr(cur, NULL))
 381                         goto error;
 382
 383                 argv[argc++] = blobmsg_data(cur);
 384                 if (argc == ARRAY_SIZE(argv) - 1)
 385                         goto error;
 386         }
 387         argv[argc] = NULL;
 388         start_process((const char **) argv, &state->proto_task);
 389
 390         return 0;
 391
 392 error:
 393         return UBUS_STATUS_INVALID_ARGUMENT;
 394 }
 395
 396 static int
 397 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 398 {
 399         struct proto_shell_state *state;
 400         struct blob_attr *tb[__NOTIFY_LAST];
 401
 402         state = container_of(proto, struct proto_shell_state, proto);
 403
 404         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 405         if (!tb[NOTIFY_ACTION])
 406                 return UBUS_STATUS_INVALID_ARGUMENT;
 407
 408         switch(blobmsg_get_u32(tb[NOTIFY_ACTION])) {
 409         case 0:
 410                 return proto_shell_update_link(state, tb);
 411         case 1:
 412                 return proto_shell_run_command(state, tb);
 413         default:
 414                 return UBUS_STATUS_INVALID_ARGUMENT;
 415         }
 416 }
 417
 418 struct interface_proto_state *
 419 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 420                    struct blob_attr *attr)
 421 {
 422         struct proto_shell_state *state;
 423
 424         state = calloc(1, sizeof(*state));
 425         state->config = malloc(blob_pad_len(attr));
 426         if (!state->config)
 427                 goto error;
 428
 429         memcpy(state->config, attr, blob_pad_len(attr));
 430         state->proto.free = proto_shell_free;
 431         state->proto.notify = proto_shell_notify;
 432         state->proto.cb = proto_shell_handler;
 433         state->setup_timeout.cb = proto_shell_setup_timeout_cb;
 434         state->setup_task.cb = proto_shell_setup_cb;
 435         state->teardown_task.cb = proto_shell_teardown_cb;
 436         state->proto_task.cb = proto_shell_task_cb;
 437         state->handler = container_of(h, struct proto_shell_handler, proto);
 438
 439         return &state->proto;
 440
 441 error:
 442         free(state);
 443         return NULL;
 444 }
 445
 446 static json_object *
 447 check_type(json_object *obj, json_type type)
 448 {
 449         if (!obj)
 450                 return NULL;
 451
 452         if (json_object_get_type(obj) != type)
 453                 return NULL;
 454
 455         return obj;
 456 }
 457
 458 static inline json_object *
 459 get_field(json_object *obj, const char *name, json_type type)
 460 {
 461         return check_type(json_object_object_get(obj, name), type);
 462 }
 463
 464 static char *
 465 proto_shell_parse_config(struct config_param_list *config, json_object *obj)
 466 {
 467         struct blobmsg_policy *attrs;
 468         char *str_buf, *str_cur;
 469         int str_len = 0;
 470         int i;
 471
 472         config->n_params = json_object_array_length(obj);
 473         attrs = calloc(1, sizeof(*attrs) * config->n_params);
 474         if (!attrs)
 475                 return NULL;
 476
 477         config->params = attrs;
 478         for (i = 0; i < config->n_params; i++) {
 479                 json_object *cur, *name, *type;
 480
 481                 cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
 482                 if (!cur)
 483                         goto error;
 484
 485                 name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
 486                 if (!name)
 487                         goto error;
 488
 489                 type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
 490                 if (!type)
 491                         goto error;
 492
 493                 attrs[i].name = json_object_get_string(name);
 494                 attrs[i].type = json_object_get_int(type);
 495                 if (attrs[i].type > BLOBMSG_TYPE_LAST)
 496                         goto error;
 497
 498                 str_len += strlen(attrs[i].name) + 1;
 499         }
 500
 501         str_buf = malloc(str_len);
 502         if (!str_buf)
 503                 goto error;
 504
 505         str_cur = str_buf;
 506         for (i = 0; i < config->n_params; i++) {
 507                 const char *name = attrs[i].name;
 508
 509                 attrs[i].name = str_cur;
 510                 str_cur += sprintf(str_cur, "%s", name) + 1;
 511         }
 512
 513         return str_buf;
 514
 515 error:
 516         free(attrs);
 517         config->n_params = 0;
 518         return NULL;
 519 }
 520
 521 static void
 522 proto_shell_add_handler(const char *script, json_object *obj)
 523 {
 524         struct proto_shell_handler *handler;
 525         struct proto_handler *proto;
 526         json_object *config, *tmp;
 527         const char *name;
 528         char *str;
 529
 530         if (!check_type(obj, json_type_object))
 531                 return;
 532
 533         tmp = get_field(obj, "name", json_type_string);
 534         if (!tmp)
 535                 return;
 536
 537         name = json_object_get_string(tmp);
 538
 539         handler = calloc(1, sizeof(*handler) +
 540                          strlen(script) + 1 +
 541                          strlen(name) + 1);
 542         if (!handler)
 543                 return;
 544
 545         strcpy(handler->script_name, script);
 546
 547         str = handler->script_name + strlen(handler->script_name) + 1;
 548         strcpy(str, name);
 549
 550         proto = &handler->proto;
 551         proto->name = str;
 552         proto->config_params = &handler->config;
 553         proto->attach = proto_shell_attach;
 554
 555         tmp = get_field(obj, "no-device", json_type_boolean);
 556         if (tmp && json_object_get_boolean(tmp))
 557                 handler->proto.flags |= PROTO_FLAG_NODEV;
 558
 559         config = get_field(obj, "config", json_type_array);
 560         if (config)
 561                 handler->config_buf = proto_shell_parse_config(&handler->config, config);
 562
 563         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 564         add_proto_handler(proto);
 565 }
 566
 567 static void proto_shell_add_script(const char *name)
 568 {
 569         struct json_tokener *tok = NULL;
 570         json_object *obj;
 571         static char buf[512];
 572         char *start, *end, *cmd;
 573         FILE *f;
 574         int buflen, len;
 575
 576 #define DUMP_SUFFIX     " '' dump"
 577
 578         cmd = alloca(strlen(name) + 1 + sizeof(DUMP_SUFFIX));
 579         sprintf(cmd, "%s" DUMP_SUFFIX, name);
 580
 581         f = popen(cmd, "r");
 582         if (!f)
 583                 return;
 584
 585         do {
 586                 buflen = fread(buf, 1, sizeof(buf) - 1, f);
 587                 if (buflen <= 0)
 588                         continue;
 589
 590                 start = buf;
 591                 len = buflen;
 592                 do {
 593                         end = memchr(start, '\n', len);
 594                         if (end)
 595                                 len = end - start;
 596
 597                         if (!tok)
 598                                 tok = json_tokener_new();
 599
 600                         obj = json_tokener_parse_ex(tok, start, len);
 601                         if (!is_error(obj)) {
 602                                 proto_shell_add_handler(name, obj);
 603                                 json_object_put(obj);
 604                                 json_tokener_free(tok);
 605                                 tok = NULL;
 606                         }
 607
 608                         if (end) {
 609                                 start = end + 1;
 610                                 len = buflen - (start - buf);
 611                         }
 612                 } while (len > 0);
 613         } while (!feof(f) && !ferror(f));
 614
 615         if (tok)
 616                 json_tokener_free(tok);
 617
 618         pclose(f);
 619 }
 620
 621 void __init proto_shell_init(void)
 622 {
 623         glob_t g;
 624         int main_fd;
 625         int i;
 626
 627         main_fd = open(".", O_RDONLY | O_DIRECTORY);
 628         if (main_fd < 0)
 629                 return;
 630
 631         if (chdir(main_path)) {
 632                 perror("chdir(main path)");
 633                 goto close_cur;
 634         }
 635
 636         if (chdir("./proto"))
 637                 goto close_cur;
 638
 639         proto_fd = open(".", O_RDONLY | O_DIRECTORY);
 640         if (proto_fd < 0)
 641                 goto close_cur;
 642
 643         glob("./*.sh", 0, NULL, &g);
 644         for (i = 0; i < g.gl_pathc; i++)
 645                 proto_shell_add_script(g.gl_pathv[i]);
 646
 647 close_cur:
 648         fchdir(main_fd);
 649         close(main_fd);
 650 }