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