proto-shell.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <glob.h>
   5 #include <unistd.h>
   6 #include <fcntl.h>
   7 #include <signal.h>
   8
   9 #include <arpa/inet.h>
  10 #include <netinet/in.h>
  11
  12 #include <libubox/blobmsg_json.h>
  13
  14 #include "netifd.h"
  15 #include "interface.h"
  16 #include "interface-ip.h"
  17 #include "proto.h"
  18
  19 static int proto_fd;
  20
  21 struct proto_shell_handler {
  22         struct list_head list;
  23         struct proto_handler proto;
  24         struct config_param_list config;
  25         char *config_buf;
  26         char script_name[];
  27 };
  28
  29 struct proto_shell_state {
  30         struct interface_proto_state proto;
  31         struct proto_shell_handler *handler;
  32         struct blob_attr *config;
  33
  34         struct device_user l3_dev;
  35
  36         struct uloop_timeout setup_timeout;
  37         struct uloop_process setup_task;
  38         struct uloop_process teardown_task;
  39         bool teardown_pending;
  40 };
  41
  42 static int
  43 run_script(const char **argv, struct uloop_process *proc)
  44 {
  45         int pid;
  46
  47         if ((pid = fork()) < 0)
  48                 return -1;
  49
  50         if (!pid) {
  51                 fchdir(proto_fd);
  52                 execvp(argv[0], (char **) argv);
  53                 exit(127);
  54         }
  55
  56         if (pid < 0)
  57                 return -1;
  58
  59         proc->pid = pid;
  60         uloop_process_add(proc);
  61
  62         return 0;
  63 }
  64
  65 static int
  66 proto_shell_handler(struct interface_proto_state *proto,
  67                     enum interface_proto_cmd cmd, bool force)
  68 {
  69         struct proto_shell_state *state;
  70         struct proto_shell_handler *handler;
  71         struct uloop_process *proc;
  72         const char *argv[6];
  73         const char *action;
  74         char *config;
  75         int ret, i = 0;
  76
  77         state = container_of(proto, struct proto_shell_state, proto);
  78         handler = state->handler;
  79
  80         if (cmd == PROTO_CMD_SETUP) {
  81                 action = "setup";
  82                 proc = &state->setup_task;
  83         } else {
  84                 action = "teardown";
  85                 proc = &state->teardown_task;
  86                 if (state->setup_task.pending) {
  87                         uloop_timeout_set(&state->setup_timeout, 1000);
  88                         kill(state->setup_task.pid, SIGINT);
  89                         state->teardown_pending = true;
  90                         return 0;
  91                 }
  92         }
  93
  94         config = blobmsg_format_json(state->config, true);
  95         if (!config)
  96                 return -1;
  97
  98         argv[i++] = handler->script_name;
  99         argv[i++] = handler->proto.name;
 100         argv[i++] = action;
 101         argv[i++] = proto->iface->name;
 102         argv[i++] = config;
 103         if (proto->iface->main_dev.dev)
 104                 argv[i++] = proto->iface->main_dev.dev->ifname;
 105         argv[i] = NULL;
 106
 107         ret = run_script(argv, proc);
 108         free(config);
 109
 110         return ret;
 111 }
 112
 113 static void
 114 proto_shell_setup_timeout_cb(struct uloop_timeout *timeout)
 115 {
 116         struct proto_shell_state *state;
 117
 118         state = container_of(timeout, struct proto_shell_state, setup_timeout);
 119         kill(state->setup_task.pid, SIGKILL);
 120 }
 121
 122 static void
 123 proto_shell_setup_cb(struct uloop_process *p, int ret)
 124 {
 125         struct proto_shell_state *state;
 126
 127         state = container_of(p, struct proto_shell_state, setup_task);
 128         uloop_timeout_cancel(&state->setup_timeout);
 129         if (state->teardown_pending) {
 130                 state->teardown_pending = false;
 131                 proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
 132         }
 133 }
 134
 135 static void
 136 proto_shell_teardown_cb(struct uloop_process *p, int ret)
 137 {
 138         struct proto_shell_state *state;
 139
 140         state = container_of(p, struct proto_shell_state, teardown_task);
 141         state->proto.proto_event(&state->proto, IFPEV_DOWN);
 142         if (state->l3_dev.dev)
 143                 device_remove_user(&state->l3_dev);
 144 }
 145
 146 static void
 147 proto_shell_free(struct interface_proto_state *proto)
 148 {
 149         struct proto_shell_state *state;
 150
 151         state = container_of(proto, struct proto_shell_state, proto);
 152         free(state->config);
 153         free(state);
 154 }
 155
 156 static void
 157 proto_shell_parse_addr_list(struct interface *iface, struct blob_attr *attr,
 158                             bool v6, bool external)
 159 {
 160         struct device_addr *addr;
 161         struct blob_attr *cur;
 162         int rem;
 163
 164         blobmsg_for_each_attr(cur, attr, rem) {
 165                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING) {
 166                         DPRINTF("Ignore wrong address type: %d\n", blobmsg_type(cur));
 167                         continue;
 168                 }
 169
 170                 addr = proto_parse_ip_addr_string(blobmsg_data(cur), v6, v6 ? 32 : 128);
 171                 if (!addr) {
 172                         DPRINTF("Failed to parse IP address string: %s\n", (char *) blobmsg_data(cur));
 173                         continue;
 174                 }
 175
 176                 if (external)
 177                         addr->flags |= DEVADDR_EXTERNAL;
 178
 179                 vlist_add(&iface->proto_addr, &addr->node);
 180         }
 181 }
 182
 183 enum {
 184         ROUTE_TARGET,
 185         ROUTE_MASK,
 186         ROUTE_GATEWAY,
 187         ROUTE_DEVICE,
 188         __ROUTE_LAST
 189 };
 190
 191 static const struct blobmsg_policy route_attr[__ROUTE_LAST] = {
 192         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 193         [ROUTE_MASK] = { .name = "mask", .type = BLOBMSG_TYPE_INT32 },
 194         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
 195         [ROUTE_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 196 };
 197
 198 static void
 199 parse_route(struct interface *iface, struct blob_attr *attr, bool v6)
 200 {
 201         struct blob_attr *tb[__ROUTE_LAST], *cur;
 202         struct device_route *route;
 203         int af = v6 ? AF_INET6 : AF_INET;
 204
 205         blobmsg_parse(route_attr, __ROUTE_LAST, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 206
 207         if (!tb[ROUTE_GATEWAY] && !tb[ROUTE_DEVICE])
 208                 return;
 209
 210         route = calloc(1, sizeof(*route));
 211         if (!route)
 212                 return;
 213
 214         route->mask = v6 ? 128 : 32;
 215         if ((cur = tb[ROUTE_MASK]) != NULL) {
 216                 route->mask = blobmsg_get_u32(cur);
 217                 if (route->mask > v6 ? 128 : 32)
 218                         goto error;
 219         }
 220
 221         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 222                 if (!inet_pton(af, blobmsg_data(cur), &route->addr)) {
 223                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 224                         goto error;
 225                 }
 226         }
 227
 228         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 229                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 230                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 231                         goto error;
 232                 }
 233         }
 234
 235         if ((cur = tb[ROUTE_DEVICE]) != NULL)
 236                 route->device = device_get(blobmsg_data(cur), true);
 237
 238         vlist_add(&iface->proto_route, &route->node);
 239         return;
 240
 241 error:
 242         free(route);
 243 }
 244
 245 static void
 246 proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 247                              bool v6)
 248 {
 249         struct blob_attr *cur;
 250         int rem;
 251
 252         blobmsg_for_each_attr(cur, attr, rem) {
 253                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE) {
 254                         DPRINTF("Ignore wrong route type: %d\n", blobmsg_type(cur));
 255                         continue;
 256                 }
 257
 258                 parse_route(iface, cur, v6);
 259         }
 260 }
 261
 262
 263 enum {
 264         NOTIFY_LINK_UP,
 265         NOTIFY_IFNAME,
 266         NOTIFY_ADDR_EXT,
 267         NOTIFY_IPADDR,
 268         NOTIFY_IP6ADDR,
 269         NOTIFY_ROUTES,
 270         NOTIFY_ROUTES6,
 271         __NOTIFY_LAST
 272 };
 273
 274 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
 275         [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
 276         [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
 277         [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
 278         [NOTIFY_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
 279         [NOTIFY_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
 280         [NOTIFY_ROUTES] = { .name = "routes", .type = BLOBMSG_TYPE_ARRAY },
 281         [NOTIFY_ROUTES6] = { .name = "routes6", .type = BLOBMSG_TYPE_ARRAY },
 282 };
 283
 284 static int
 285 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 286 {
 287         struct proto_shell_state *state;
 288         struct blob_attr *tb[__NOTIFY_LAST], *cur;
 289         bool addr_ext = false;
 290         bool up;
 291
 292         state = container_of(proto, struct proto_shell_state, proto);
 293
 294         blobmsg_parse(notify_attr, __NOTIFY_LAST, tb, blob_data(attr), blob_len(attr));
 295         if (!tb[NOTIFY_LINK_UP])
 296                 return UBUS_STATUS_INVALID_ARGUMENT;
 297
 298         up = blobmsg_get_bool(tb[NOTIFY_LINK_UP]);
 299         if (up) {
 300                 if (!tb[NOTIFY_IFNAME])
 301                         return UBUS_STATUS_INVALID_ARGUMENT;
 302
 303                 if (!state->l3_dev.dev) {
 304                         device_add_user(&state->l3_dev,
 305                                 device_get(blobmsg_data(tb[NOTIFY_IFNAME]), true));
 306                         device_claim(&state->l3_dev);
 307                         state->proto.iface->l3_dev = &state->l3_dev;
 308                 }
 309                 state->proto.proto_event(&state->proto, IFPEV_UP);
 310         } else {
 311                 state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
 312         }
 313
 314         if ((cur = tb[NOTIFY_ADDR_EXT]) != NULL)
 315                 addr_ext = blobmsg_get_bool(cur);
 316
 317         if ((cur = tb[NOTIFY_IPADDR]) != NULL)
 318                 proto_shell_parse_addr_list(state->proto.iface, cur, false, addr_ext);
 319
 320         if ((cur = tb[NOTIFY_IP6ADDR]) != NULL)
 321                 proto_shell_parse_addr_list(state->proto.iface, cur, true, addr_ext);
 322
 323         if ((cur = tb[NOTIFY_ROUTES]) != NULL)
 324                 proto_shell_parse_route_list(state->proto.iface, cur, false);
 325
 326         if ((cur = tb[NOTIFY_ROUTES6]) != NULL)
 327                 proto_shell_parse_route_list(state->proto.iface, cur, true);
 328
 329         return 0;
 330 }
 331
 332 struct interface_proto_state *
 333 proto_shell_attach(const struct proto_handler *h, struct interface *iface,
 334                    struct blob_attr *attr)
 335 {
 336         struct proto_shell_state *state;
 337
 338         state = calloc(1, sizeof(*state));
 339         state->config = malloc(blob_pad_len(attr));
 340         if (!state->config)
 341                 goto error;
 342
 343         memcpy(state->config, attr, blob_pad_len(attr));
 344         state->proto.free = proto_shell_free;
 345         state->proto.notify = proto_shell_notify;
 346         state->proto.cb = proto_shell_handler;
 347         state->setup_timeout.cb = proto_shell_setup_timeout_cb;
 348         state->setup_task.cb = proto_shell_setup_cb;
 349         state->teardown_task.cb = proto_shell_teardown_cb;
 350         state->handler = container_of(h, struct proto_shell_handler, proto);
 351
 352         return &state->proto;
 353
 354 error:
 355         free(state);
 356         return NULL;
 357 }
 358
 359 static json_object *
 360 check_type(json_object *obj, json_type type)
 361 {
 362         if (!obj)
 363                 return NULL;
 364
 365         if (json_object_get_type(obj) != type)
 366                 return NULL;
 367
 368         return obj;
 369 }
 370
 371 static inline json_object *
 372 get_field(json_object *obj, const char *name, json_type type)
 373 {
 374         return check_type(json_object_object_get(obj, name), type);
 375 }
 376
 377 static char *
 378 proto_shell_parse_config(struct config_param_list *config, json_object *obj)
 379 {
 380         struct blobmsg_policy *attrs;
 381         char *str_buf, *str_cur;
 382         int str_len = 0;
 383         int i;
 384
 385         attrs = calloc(1, sizeof(*attrs));
 386         if (!attrs)
 387                 return NULL;
 388
 389         config->n_params = json_object_array_length(obj);
 390         config->params = attrs;
 391         for (i = 0; i < config->n_params; i++) {
 392                 json_object *cur, *name, *type;
 393
 394                 cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
 395                 if (!cur)
 396                         goto error;
 397
 398                 name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
 399                 if (!name)
 400                         goto error;
 401
 402                 type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
 403                 if (!type)
 404                         goto error;
 405
 406                 attrs[i].name = json_object_get_string(name);
 407                 attrs[i].type = json_object_get_int(type);
 408                 if (attrs[i].type > BLOBMSG_TYPE_LAST)
 409                         goto error;
 410
 411                 str_len += strlen(attrs[i].name + 1);
 412         }
 413
 414         str_buf = malloc(str_len);
 415         if (!str_buf)
 416                 goto error;
 417
 418         str_cur = str_buf;
 419         for (i = 0; i < config->n_params; i++) {
 420                 const char *name = attrs[i].name;
 421
 422                 attrs[i].name = str_cur;
 423                 str_cur += sprintf(str_cur, "%s", name) + 1;
 424         }
 425
 426         return str_buf;
 427
 428 error:
 429         free(attrs);
 430         config->n_params = 0;
 431         return NULL;
 432 }
 433
 434 static void
 435 proto_shell_add_handler(const char *script, json_object *obj)
 436 {
 437         struct proto_shell_handler *handler;
 438         struct proto_handler *proto;
 439         json_object *config, *tmp;
 440         const char *name;
 441         char *str;
 442
 443         if (!check_type(obj, json_type_object))
 444                 return;
 445
 446         tmp = get_field(obj, "name", json_type_string);
 447         if (!tmp)
 448                 return;
 449
 450         name = json_object_get_string(tmp);
 451
 452         handler = calloc(1, sizeof(*handler) +
 453                          strlen(script) + 1 +
 454                          strlen(name) + 1);
 455         if (!handler)
 456                 return;
 457
 458         strcpy(handler->script_name, script);
 459
 460         str = handler->script_name + strlen(handler->script_name) + 1;
 461         strcpy(str, name);
 462
 463         proto = &handler->proto;
 464         proto->name = str;
 465         proto->config_params = &handler->config;
 466         proto->attach = proto_shell_attach;
 467
 468         tmp = get_field(obj, "no-device", json_type_boolean);
 469         if (tmp && json_object_get_boolean(tmp))
 470                 handler->proto.flags |= PROTO_FLAG_NODEV;
 471
 472         config = get_field(obj, "config", json_type_array);
 473         if (config)
 474                 handler->config_buf = proto_shell_parse_config(&handler->config, config);
 475
 476         DPRINTF("Add handler for script %s: %s\n", script, proto->name);
 477         add_proto_handler(proto);
 478 }
 479
 480 static void proto_shell_add_script(const char *name)
 481 {
 482         struct json_tokener *tok = NULL;
 483         json_object *obj;
 484         static char buf[512];
 485         char *start, *end, *cmd;
 486         FILE *f;
 487         int buflen, len;
 488
 489 #define DUMP_SUFFIX     " '' dump"
 490
 491         cmd = alloca(strlen(name) + 1 + sizeof(DUMP_SUFFIX));
 492         sprintf(cmd, "%s" DUMP_SUFFIX, name);
 493
 494         f = popen(cmd, "r");
 495         if (!f)
 496                 return;
 497
 498         do {
 499                 buflen = fread(buf, 1, sizeof(buf) - 1, f);
 500                 if (buflen <= 0)
 501                         continue;
 502
 503                 start = buf;
 504                 len = buflen;
 505                 do {
 506                         end = memchr(start, '\n', len);
 507                         if (end)
 508                                 len = end - start;
 509
 510                         if (!tok)
 511                                 tok = json_tokener_new();
 512
 513                         obj = json_tokener_parse_ex(tok, start, len);
 514                         if (!is_error(obj)) {
 515                                 proto_shell_add_handler(name, obj);
 516                                 json_object_put(obj);
 517                                 json_tokener_free(tok);
 518                                 tok = NULL;
 519                         }
 520
 521                         if (end) {
 522                                 start = end + 1;
 523                                 len = buflen - (start - buf);
 524                         }
 525                 } while (len > 0);
 526         } while (!feof(f) && !ferror(f));
 527
 528         if (tok)
 529                 json_tokener_free(tok);
 530
 531         pclose(f);
 532 }
 533
 534 void __init proto_shell_init(void)
 535 {
 536         glob_t g;
 537         int main_fd;
 538         int i;
 539
 540         main_fd = open(".", O_RDONLY | O_DIRECTORY);
 541         if (main_fd < 0)
 542                 return;
 543
 544         if (chdir(main_path)) {
 545                 perror("chdir(main path)");
 546                 goto close_cur;
 547         }
 548
 549         if (chdir("./proto"))
 550                 goto close_cur;
 551
 552         proto_fd = open(".", O_RDONLY | O_DIRECTORY);
 553         if (proto_fd < 0)
 554                 goto close_cur;
 555
 556         glob("./*.sh", 0, NULL, &g);
 557         for (i = 0; i < g.gl_pathc; i++)
 558                 proto_shell_add_script(g.gl_pathv[i]);
 559
 560 close_cur:
 561         fchdir(main_fd);
 562         close(main_fd);
 563 }