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