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