uxc.c

   1 /*
   2  * Copyright (C) 2020 Daniel Golle <daniel@makrotopia.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License version 2.1
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #ifndef _GNU_SOURCE
  15 #define _GNU_SOURCE
  16 #endif
  17
  18 #include <stdlib.h>
  19 #include <stdbool.h>
  20 #include <fcntl.h>
  21 #include <libubus.h>
  22 #include <libubox/avl-cmp.h>
  23 #include <libubox/blobmsg.h>
  24 #include <libubox/blobmsg_json.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29 #include <errno.h>
  30 #include <getopt.h>
  31 #include <sys/stat.h>
  32 #include <sys/types.h>
  33 #include <glob.h>
  34 #include <signal.h>
  35
  36 #include "log.h"
  37
  38 #define UXC_VERSION "0.2"
  39 #define OCI_VERSION_STRING "1.0.2"
  40 #define UXC_ETC_CONFDIR "/etc/uxc"
  41 #define UXC_VOL_CONFDIR "/var/state/uxc"
  42
  43 static bool verbose = false;
  44 static char *confdir = UXC_ETC_CONFDIR;
  45
  46 struct runtime_state {
  47         struct avl_node avl;
  48         char *container_name;
  49         char *instance_name;
  50         char *jail_name;
  51         bool running;
  52         int runtime_pid;
  53         int exitcode;
  54         struct blob_attr *ocistate;
  55 };
  56
  57 enum uxc_cmd {
  58         CMD_LIST,
  59         CMD_BOOT,
  60         CMD_START,
  61         CMD_STATE,
  62         CMD_KILL,
  63         CMD_ENABLE,
  64         CMD_DISABLE,
  65         CMD_DELETE,
  66         CMD_CREATE,
  67         CMD_UNKNOWN
  68 };
  69
  70 #define OPT_ARGS "ab:fm:p:t:vVw:"
  71 static struct option long_options[] = {
  72         {"autostart",           no_argument,            0,      'a'     },
  73         {"bundle",              required_argument,      0,      'b'     },
  74         {"force",               no_argument,            0,      'f'     },
  75         {"mounts",              required_argument,      0,      'm'     },
  76         {"pid-file",            required_argument,      0,      'p'     },
  77         {"temp-overlay-size",   required_argument,      0,      't'     },
  78         {"write-overlay-path",  required_argument,      0,      'w'     },
  79         {"verbose",             no_argument,            0,      'v'     },
  80         {"version",             no_argument,            0,      'V'     },
  81         {0,                     0,                      0,      0       }
  82 };
  83
  84 AVL_TREE(runtime, avl_strcmp, false, NULL);
  85 static struct blob_buf conf;
  86 static struct blob_attr *blockinfo;
  87 static struct blob_attr *fstabinfo;
  88 static struct ubus_context *ctx;
  89
  90 static int usage(void) {
  91         printf("syntax: uxc <command> [parameters ...]\n");
  92         printf("commands:\n");
  93         printf("\tlist\t\t\t\t\t\tlist all configured containers\n");
  94         printf("\tcreate <conf>\t\t\t\t\t(re-)create <conf>\n");
  95         printf("                [--bundle <path>]\t\t\tOCI bundle at <path>\n");
  96         printf("                [--autostart]\t\t\t\tstart on boot\n");
  97         printf("                [--temp-overlay-size size]\t\tuse tmpfs overlay with {size}\n");
  98         printf("                [--write-overlay-path path]\t\tuse overlay on {path}\n");
  99         printf("                [--mounts v1,v2,...,vN]\t\trequire filesystems to be available\n");
 100         printf("\tstart <conf>\t\t\t\t\tstart container <conf>\n");
 101         printf("\tstate <conf>\t\t\t\t\tget state of container <conf>\n");
 102         printf("\tkill <conf> [<signal>]\t\t\t\tsend signal to container <conf>\n");
 103         printf("\tenable <conf>\t\t\t\t\tstart container <conf> on boot\n");
 104         printf("\tdisable <conf>\t\t\t\t\tdon't start container <conf> on boot\n");
 105         printf("\tdelete <conf> [--force]\t\t\t\tdelete <conf>\n");
 106         return EINVAL;
 107 }
 108
 109 enum {
 110         CONF_NAME,
 111         CONF_PATH,
 112         CONF_JAIL,
 113         CONF_AUTOSTART,
 114         CONF_PIDFILE,
 115         CONF_TEMP_OVERLAY_SIZE,
 116         CONF_WRITE_OVERLAY_PATH,
 117         CONF_VOLUMES,
 118         __CONF_MAX,
 119 };
 120
 121 static const struct blobmsg_policy conf_policy[__CONF_MAX] = {
 122         [CONF_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 123         [CONF_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 124         [CONF_JAIL] = { .name = "jail", .type = BLOBMSG_TYPE_STRING },
 125         [CONF_AUTOSTART] = { .name = "autostart", .type = BLOBMSG_TYPE_BOOL },
 126         [CONF_PIDFILE] = { .name = "pidfile", .type = BLOBMSG_TYPE_STRING },
 127         [CONF_TEMP_OVERLAY_SIZE] = { .name = "temp-overlay-size", .type = BLOBMSG_TYPE_STRING },
 128         [CONF_WRITE_OVERLAY_PATH] = { .name = "write-overlay-path", .type = BLOBMSG_TYPE_STRING },
 129         [CONF_VOLUMES] = { .name = "volumes", .type = BLOBMSG_TYPE_ARRAY },
 130 };
 131
 132 static int conf_load(void)
 133 {
 134         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 135         int j, res;
 136         glob_t gl;
 137         char *globstr;
 138         void *c, *o;
 139         struct stat sb;
 140
 141         if (!stat(UXC_VOL_CONFDIR, &sb)) {
 142                 if (sb.st_mode & S_IFDIR)
 143                         confdir = UXC_VOL_CONFDIR;
 144         }
 145
 146         if (asprintf(&globstr, "%s/*.json", confdir) == -1)
 147                 return ENOMEM;
 148
 149         blob_buf_init(&conf, 0);
 150         c = blobmsg_open_table(&conf, NULL);
 151
 152         res = glob(globstr, gl_flags, NULL, &gl);
 153         free(globstr);
 154         if (res < 0)
 155                 return 0;
 156
 157         for (j = 0; j < gl.gl_pathc; j++) {
 158                 o = blobmsg_open_table(&conf, strdup(gl.gl_pathv[j]));
 159                 if (!blobmsg_add_json_from_file(&conf, gl.gl_pathv[j])) {
 160                         ERROR("uxc: failed to load %s\n", gl.gl_pathv[j]);
 161                         continue;
 162                 }
 163                 blobmsg_close_table(&conf, o);
 164         }
 165         blobmsg_close_table(&conf, c);
 166         globfree(&gl);
 167
 168         return 0;
 169 }
 170
 171 enum {
 172         LIST_INSTANCES,
 173         __LIST_MAX,
 174 };
 175
 176 static const struct blobmsg_policy list_policy[__LIST_MAX] = {
 177         [LIST_INSTANCES] = { .name = "instances", .type = BLOBMSG_TYPE_TABLE },
 178 };
 179
 180 enum {
 181         INSTANCE_RUNNING,
 182         INSTANCE_PID,
 183         INSTANCE_EXITCODE,
 184         INSTANCE_JAIL,
 185         __INSTANCE_MAX,
 186 };
 187
 188 static const struct blobmsg_policy instance_policy[__INSTANCE_MAX] = {
 189         [INSTANCE_RUNNING] = { .name = "running", .type = BLOBMSG_TYPE_BOOL },
 190         [INSTANCE_PID] = { .name = "pid", .type = BLOBMSG_TYPE_INT32 },
 191         [INSTANCE_EXITCODE] = { .name = "exit_code", .type = BLOBMSG_TYPE_INT32 },
 192         [INSTANCE_JAIL] = { .name = "jail", .type = BLOBMSG_TYPE_TABLE },
 193 };
 194
 195 enum {
 196         JAIL_NAME,
 197         __JAIL_MAX,
 198 };
 199
 200 static const struct blobmsg_policy jail_policy[__JAIL_MAX] = {
 201         [JAIL_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 202 };
 203
 204 static struct runtime_state *
 205 runtime_alloc(const char *container_name)
 206 {
 207         struct runtime_state *s;
 208         char *new_name;
 209         s = calloc_a(sizeof(*s), &new_name, strlen(container_name) + 1);
 210         strcpy(new_name, container_name);
 211         s->container_name = new_name;
 212         s->avl.key = s->container_name;
 213         return s;
 214 }
 215
 216 enum {
 217         STATE_OCIVERSION,
 218         STATE_ID,
 219         STATE_STATUS,
 220         STATE_PID,
 221         STATE_BUNDLE,
 222         STATE_ANNOTATIONS,
 223         __STATE_MAX,
 224 };
 225
 226 static const struct blobmsg_policy state_policy[__STATE_MAX] = {
 227         [STATE_OCIVERSION] = { .name = "ociVersion", .type = BLOBMSG_TYPE_STRING },
 228         [STATE_ID] = { .name = "id", .type = BLOBMSG_TYPE_STRING },
 229         [STATE_STATUS] = { .name = "status", .type = BLOBMSG_TYPE_STRING },
 230         [STATE_PID] = { .name = "pid", .type = BLOBMSG_TYPE_INT32 },
 231         [STATE_BUNDLE] = { .name = "bundle", .type = BLOBMSG_TYPE_STRING },
 232         [STATE_ANNOTATIONS] = { .name = "annotations", .type = BLOBMSG_TYPE_TABLE },
 233 };
 234
 235
 236 static void ocistate_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 237 {
 238         struct blob_attr **ocistate = (struct blob_attr **)req->priv;
 239         struct blob_attr *tb[__STATE_MAX];
 240
 241         blobmsg_parse(state_policy, __STATE_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
 242
 243         if (!tb[STATE_OCIVERSION] ||
 244             !tb[STATE_ID] ||
 245             !tb[STATE_STATUS] ||
 246             !tb[STATE_BUNDLE])
 247                 return;
 248
 249         *ocistate = blob_memdup(msg);
 250 }
 251
 252 static void get_ocistate(struct blob_attr **ocistate, const char *name)
 253 {
 254         char *objname;
 255         unsigned int id;
 256         int ret;
 257         *ocistate = NULL;
 258
 259         if (asprintf(&objname, "container.%s", name) == -1)
 260                 exit(ENOMEM);
 261
 262         ret = ubus_lookup_id(ctx, objname, &id);
 263         free(objname);
 264         if (ret)
 265                 return;
 266
 267         ubus_invoke(ctx, id, "state", NULL, ocistate_cb, ocistate, 3000);
 268 }
 269
 270 static void list_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 271 {
 272         struct blob_attr *cur, *curi, *tl[__LIST_MAX], *ti[__INSTANCE_MAX], *tj[__JAIL_MAX];
 273         int rem, remi;
 274         const char *container_name, *instance_name, *jail_name;
 275         bool running;
 276         int pid, exitcode;
 277         struct runtime_state *rs;
 278
 279         blobmsg_for_each_attr(cur, msg, rem) {
 280                 container_name = blobmsg_name(cur);
 281                 blobmsg_parse(list_policy, __LIST_MAX, tl, blobmsg_data(cur), blobmsg_len(cur));
 282                 if (!tl[LIST_INSTANCES])
 283                         continue;
 284
 285                 blobmsg_for_each_attr(curi, tl[LIST_INSTANCES], remi) {
 286                         instance_name = blobmsg_name(curi);
 287                         blobmsg_parse(instance_policy, __INSTANCE_MAX, ti, blobmsg_data(curi), blobmsg_len(curi));
 288
 289                         if (!ti[INSTANCE_JAIL])
 290                                 continue;
 291
 292                         blobmsg_parse(jail_policy, __JAIL_MAX, tj, blobmsg_data(ti[INSTANCE_JAIL]), blobmsg_len(ti[INSTANCE_JAIL]));
 293                         if (!tj[JAIL_NAME])
 294                                 continue;
 295
 296                         jail_name = blobmsg_get_string(tj[JAIL_NAME]);
 297
 298                         running = ti[INSTANCE_RUNNING] && blobmsg_get_bool(ti[INSTANCE_RUNNING]);
 299
 300                         if (ti[INSTANCE_PID])
 301                                 pid = blobmsg_get_u32(ti[INSTANCE_PID]);
 302                         else
 303                                 pid = -1;
 304
 305                         if (ti[INSTANCE_EXITCODE])
 306                                 exitcode = blobmsg_get_u32(ti[INSTANCE_EXITCODE]);
 307                         else
 308                                 exitcode = -1;
 309
 310                         rs = runtime_alloc(container_name);
 311                         rs->instance_name = strdup(instance_name);
 312                         rs->jail_name = strdup(jail_name);
 313                         rs->runtime_pid = pid;
 314                         rs->exitcode = exitcode;
 315                         rs->running = running;
 316                         avl_insert(&runtime, &rs->avl);
 317                 }
 318         }
 319
 320         return;
 321 }
 322
 323 static int runtime_load(void)
 324 {
 325         struct runtime_state *item, *tmp;
 326         uint32_t id;
 327
 328         avl_init(&runtime, avl_strcmp, false, NULL);
 329         if (ubus_lookup_id(ctx, "container", &id) ||
 330                 ubus_invoke(ctx, id, "list", NULL, list_cb, &runtime, 3000))
 331                 return EIO;
 332
 333
 334         avl_for_each_element_safe(&runtime, item, avl, tmp)
 335                 get_ocistate(&item->ocistate, item->jail_name);
 336
 337         return 0;
 338 }
 339
 340 static void runtime_free(void)
 341 {
 342         struct runtime_state *item, *tmp;
 343
 344         avl_for_each_element_safe(&runtime, item, avl, tmp) {
 345                 avl_delete(&runtime, &item->avl);
 346                 free(item->instance_name);
 347                 free(item->jail_name);
 348                 free(item->ocistate);
 349                 free(item);
 350         }
 351
 352         return;
 353 }
 354
 355 static int uxc_state(char *name)
 356 {
 357         struct runtime_state *s = avl_find_element(&runtime, name, s, avl);
 358         struct blob_attr *ocistate = NULL;
 359         struct blob_attr *cur, *tb[__CONF_MAX];
 360         int rem;
 361         char *bundle = NULL;
 362         char *jail_name = NULL;
 363         char *state = NULL;
 364         static struct blob_buf buf;
 365
 366         if (s)
 367                 ocistate = s->ocistate;
 368
 369         if (ocistate) {
 370                 state = blobmsg_format_json_indent(ocistate, true, 0);
 371                 if (!state)
 372                         return 1;
 373
 374                 printf("%s\n", state);
 375                 free(state);
 376                 return 0;
 377         }
 378
 379         blobmsg_for_each_attr(cur, blob_data(conf.head), rem) {
 380                 blobmsg_parse(conf_policy, __CONF_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 381                 if (!tb[CONF_NAME] || !tb[CONF_PATH])
 382                         continue;
 383
 384                 if (!strcmp(name, blobmsg_get_string(tb[CONF_NAME]))) {
 385                         if (tb[CONF_JAIL])
 386                                 jail_name = blobmsg_get_string(tb[CONF_JAIL]);
 387                         else
 388                                 jail_name = name;
 389
 390                         bundle = blobmsg_get_string(tb[CONF_PATH]);
 391                         break;
 392                 }
 393         }
 394
 395         if (!bundle)
 396                 return ENOENT;
 397
 398         blob_buf_init(&buf, 0);
 399         blobmsg_add_string(&buf, "ociVersion", OCI_VERSION_STRING);
 400         blobmsg_add_string(&buf, "id", jail_name);
 401         blobmsg_add_string(&buf, "status", s?"stopped":"uninitialized");
 402         blobmsg_add_string(&buf, "bundle", bundle);
 403
 404         printf("%s\n", blobmsg_format_json_indent(buf.head, true, 0));
 405         blob_buf_free(&buf);
 406
 407         return 0;
 408 }
 409
 410 static int uxc_list(void)
 411 {
 412         struct blob_attr *cur, *tb[__CONF_MAX], *ts[__STATE_MAX];
 413         int rem;
 414         struct runtime_state *s = NULL;
 415         char *name;
 416         char *ocistatus;
 417         int container_pid = -1;
 418         bool autostart;
 419
 420         blobmsg_for_each_attr(cur, blob_data(conf.head), rem) {
 421                 blobmsg_parse(conf_policy, __CONF_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 422                 if (!tb[CONF_NAME] || !tb[CONF_PATH])
 423                         continue;
 424
 425                 autostart = tb[CONF_AUTOSTART] && blobmsg_get_bool(tb[CONF_AUTOSTART]);
 426                 ocistatus = NULL;
 427                 container_pid = 0;
 428                 name = blobmsg_get_string(tb[CONF_NAME]);
 429                 s = avl_find_element(&runtime, name, s, avl);
 430
 431                 if (s && s->ocistate) {
 432                         blobmsg_parse(state_policy, __STATE_MAX, ts, blobmsg_data(s->ocistate), blobmsg_len(s->ocistate));
 433                         ocistatus = blobmsg_get_string(ts[STATE_STATUS]);
 434                         container_pid = blobmsg_get_u32(ts[STATE_PID]);
 435                 }
 436
 437                 printf("[%c] %s %s", autostart?'*':' ', name, ocistatus?:(s && s->running)?"creating":"stopped");
 438
 439                 if (s && !s->running && (s->exitcode >= 0))
 440                         printf(" exitcode: %d (%s)", s->exitcode, strerror(s->exitcode));
 441
 442                 if (s && s->running && (s->runtime_pid >= 0))
 443                         printf(" runtime pid: %d", s->runtime_pid);
 444
 445                 if (s && s->running && (container_pid >= 0))
 446                         printf(" container pid: %d", container_pid);
 447
 448                 printf("\n");
 449         }
 450
 451         return 0;
 452 }
 453
 454 static int uxc_create(char *name, bool immediately)
 455 {
 456         static struct blob_buf req;
 457         struct blob_attr *cur, *tb[__CONF_MAX];
 458         int rem, ret;
 459         uint32_t id;
 460         struct runtime_state *s = NULL;
 461         char *path = NULL, *jailname = NULL, *pidfile = NULL, *tmprwsize = NULL, *writepath = NULL;
 462
 463         void *in, *ins, *j;
 464         bool found = false;
 465
 466         s = avl_find_element(&runtime, name, s, avl);
 467
 468         if (s && (s->running))
 469                 return EEXIST;
 470
 471         blobmsg_for_each_attr(cur, blob_data(conf.head), rem) {
 472                 blobmsg_parse(conf_policy, __CONF_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 473                 if (!tb[CONF_NAME] || !tb[CONF_PATH])
 474                         continue;
 475
 476                 if (strcmp(name, blobmsg_get_string(tb[CONF_NAME])))
 477                         continue;
 478
 479                 found = true;
 480         }
 481
 482         if (!found)
 483                 return ENOENT;
 484
 485         path = blobmsg_get_string(tb[CONF_PATH]);
 486
 487         if (tb[CONF_PIDFILE])
 488                 pidfile = blobmsg_get_string(tb[CONF_PIDFILE]);
 489
 490         if (tb[CONF_TEMP_OVERLAY_SIZE])
 491                 tmprwsize = blobmsg_get_string(tb[CONF_TEMP_OVERLAY_SIZE]);
 492
 493         if (tb[CONF_WRITE_OVERLAY_PATH])
 494                 writepath = blobmsg_get_string(tb[CONF_WRITE_OVERLAY_PATH]);
 495
 496
 497         if (tb[CONF_JAIL])
 498                 jailname = blobmsg_get_string(tb[CONF_JAIL]);
 499
 500         blob_buf_init(&req, 0);
 501         blobmsg_add_string(&req, "name", name);
 502         ins = blobmsg_open_table(&req, "instances");
 503         in = blobmsg_open_table(&req, name);
 504         blobmsg_add_string(&req, "bundle", path);
 505         j = blobmsg_open_table(&req, "jail");
 506         blobmsg_add_string(&req, "name", jailname?:name);
 507         blobmsg_add_u8(&req, "immediately", immediately);
 508
 509         if (pidfile)
 510                 blobmsg_add_string(&req, "pidfile", pidfile);
 511
 512         blobmsg_close_table(&req, j);
 513
 514         if (writepath)
 515                 blobmsg_add_string(&req, "overlaydir", writepath);
 516
 517         if (tmprwsize)
 518                 blobmsg_add_string(&req, "tmpoverlaysize", tmprwsize);
 519
 520         blobmsg_close_table(&req, in);
 521         blobmsg_close_table(&req, ins);
 522
 523         if (verbose) {
 524                 char *tmp;
 525                 tmp = blobmsg_format_json_indent(req.head, true, 1);
 526                 if (!tmp)
 527                         return ENOMEM;
 528
 529                 fprintf(stderr, "adding container to procd:\n\t%s\n", tmp);
 530                 free(tmp);
 531         }
 532
 533         ret = 0;
 534         if (ubus_lookup_id(ctx, "container", &id) ||
 535                 ubus_invoke(ctx, id, "add", req.head, NULL, NULL, 3000)) {
 536                 ret = EIO;
 537         }
 538
 539         free(jailname);
 540         free(path);
 541         blob_buf_free(&req);
 542
 543         return ret;
 544 }
 545
 546 static int uxc_start(const char *name)
 547 {
 548         char *objname;
 549         unsigned int id;
 550
 551         if (asprintf(&objname, "container.%s", name) == -1)
 552                 return ENOMEM;
 553
 554         if (ubus_lookup_id(ctx, objname, &id))
 555                 return ENOENT;
 556
 557         return ubus_invoke(ctx, id, "start", NULL, NULL, NULL, 3000);
 558 }
 559
 560 static int uxc_kill(char *name, int signal)
 561 {
 562         static struct blob_buf req;
 563         struct blob_attr *cur, *tb[__CONF_MAX];
 564         int rem, ret;
 565         char *objname;
 566         unsigned int id;
 567         struct runtime_state *s = NULL;
 568         bool found = false;
 569
 570         blobmsg_for_each_attr(cur, blob_data(conf.head), rem) {
 571                 blobmsg_parse(conf_policy, __CONF_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 572                 if (!tb[CONF_NAME] || !tb[CONF_PATH])
 573                         continue;
 574
 575                 if (strcmp(name, blobmsg_get_string(tb[CONF_NAME])))
 576                         continue;
 577
 578                 found = true;
 579                 break;
 580         }
 581
 582         if (!found)
 583                 return ENOENT;
 584
 585         s = avl_find_element(&runtime, name, s, avl);
 586
 587         if (!s || !(s->running))
 588                 return ENOENT;
 589
 590         blob_buf_init(&req, 0);
 591         blobmsg_add_u32(&req, "signal", signal);
 592         blobmsg_add_string(&req, "name", name);
 593
 594         if (asprintf(&objname, "container.%s", name) == -1)
 595                 return ENOMEM;
 596
 597         ret = ubus_lookup_id(ctx, objname, &id);
 598         free(objname);
 599         if (ret)
 600                 return ENOENT;
 601
 602         if (ubus_invoke(ctx, id, "kill", req.head, NULL, NULL, 3000))
 603                 return EIO;
 604
 605         return 0;
 606 }
 607
 608
 609 static int uxc_set(char *name, char *path, bool autostart, bool add, char *pidfile, char *_tmprwsize, char *_writepath, char *requiredmounts)
 610 {
 611         static struct blob_buf req;
 612         struct blob_attr *cur, *tb[__CONF_MAX];
 613         int rem, ret;
 614         bool found = false;
 615         char *fname = NULL;
 616         char *keeppath = NULL;
 617         char *tmprwsize = _tmprwsize;
 618         char *writepath = _writepath;
 619         char *curvol, *tmp, *mnttok;
 620         void *mntarr;
 621         int f;
 622         struct stat sb;
 623
 624         blobmsg_for_each_attr(cur, blob_data(conf.head), rem) {
 625                 blobmsg_parse(conf_policy, __CONF_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 626                 if (!tb[CONF_NAME] || !tb[CONF_PATH])
 627                         continue;
 628
 629                 if (strcmp(name, blobmsg_get_string(tb[CONF_NAME])))
 630                         continue;
 631
 632                 found = true;
 633                 break;
 634         }
 635
 636         if (found && add)
 637                 return EEXIST;
 638
 639         if (!found && !add)
 640                 return ENOENT;
 641
 642         if (add && !path)
 643                 return EINVAL;
 644
 645         if (path) {
 646                 if (stat(path, &sb) == -1)
 647                         return ENOENT;
 648
 649                 if ((sb.st_mode & S_IFMT) != S_IFDIR)
 650                         return ENOTDIR;
 651         }
 652
 653         ret = mkdir(confdir, 0755);
 654
 655         if (ret && errno != EEXIST)
 656                 return ret;
 657
 658         if (asprintf(&fname, "%s/%s.json", confdir, name) == -1)
 659                 return ENOMEM;
 660
 661         f = open(fname, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 662         if (f < 0)
 663                 return errno;
 664
 665         if (!add) {
 666                 keeppath = blobmsg_get_string(tb[CONF_PATH]);
 667                 if (tb[CONF_WRITE_OVERLAY_PATH])
 668                         writepath = blobmsg_get_string(tb[CONF_WRITE_OVERLAY_PATH]);
 669
 670                 if (tb[CONF_TEMP_OVERLAY_SIZE])
 671                         tmprwsize = blobmsg_get_string(tb[CONF_TEMP_OVERLAY_SIZE]);
 672         }
 673
 674         blob_buf_init(&req, 0);
 675         blobmsg_add_string(&req, "name", name);
 676         blobmsg_add_string(&req, "path", path?:keeppath);
 677         blobmsg_add_u8(&req, "autostart", autostart);
 678         if (pidfile)
 679                 blobmsg_add_string(&req, "pidfile", pidfile);
 680
 681         if (tmprwsize)
 682                 blobmsg_add_string(&req, "temp-overlay-size", tmprwsize);
 683
 684         if (writepath)
 685                 blobmsg_add_string(&req, "write-overlay-path", writepath);
 686
 687         if (!add && tb[CONF_VOLUMES])
 688                 blobmsg_add_blob(&req, tb[CONF_VOLUMES]);
 689
 690         if (add && requiredmounts) {
 691                 mntarr = blobmsg_open_array(&req, "volumes");
 692                 for (mnttok = requiredmounts; ; mnttok = NULL) {
 693                         curvol = strtok_r(mnttok, ",;", &tmp);
 694                         if (!curvol)
 695                                 break;
 696
 697                         blobmsg_add_string(&req, NULL, curvol);
 698                 }
 699                 blobmsg_close_array(&req, mntarr);
 700         }
 701         tmp = blobmsg_format_json_indent(req.head, true, 0);
 702         if (tmp) {
 703                 dprintf(f, "%s\n", tmp);
 704                 free(tmp);
 705         }
 706
 707         blob_buf_free(&req);
 708
 709         return 0;
 710 }
 711
 712 enum {
 713         BLOCK_INFO_DEVICE,
 714         BLOCK_INFO_UUID,
 715         BLOCK_INFO_TARGET,
 716         BLOCK_INFO_TYPE,
 717         BLOCK_INFO_MOUNT,
 718         __BLOCK_INFO_MAX,
 719 };
 720
 721 static const struct blobmsg_policy block_info_policy[__BLOCK_INFO_MAX] = {
 722         [BLOCK_INFO_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 723         [BLOCK_INFO_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 724         [BLOCK_INFO_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 725         [BLOCK_INFO_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
 726         [BLOCK_INFO_MOUNT] = { .name = "mount", .type = BLOBMSG_TYPE_STRING },
 727 };
 728
 729
 730 /* check if device 'devname' is mounted according to blockd */
 731 static int checkblock(const char *uuid)
 732 {
 733         struct blob_attr *tb[__BLOCK_INFO_MAX];
 734         struct blob_attr *cur;
 735         int rem;
 736
 737         blobmsg_for_each_attr(cur, blockinfo, rem) {
 738                 blobmsg_parse(block_info_policy, __BLOCK_INFO_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 739
 740                 if (!tb[BLOCK_INFO_UUID] || !tb[BLOCK_INFO_MOUNT])
 741                         continue;
 742
 743                 if (!strcmp(uuid, blobmsg_get_string(tb[BLOCK_INFO_UUID])))
 744                         return 0;
 745         }
 746
 747         return 1;
 748 }
 749
 750 enum {
 751         UCI_FSTAB_UUID,
 752         UCI_FSTAB_ANONYMOUS,
 753         __UCI_FSTAB_MAX,
 754 };
 755
 756 static const struct blobmsg_policy uci_fstab_policy[__UCI_FSTAB_MAX] = {
 757         [UCI_FSTAB_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 758         [UCI_FSTAB_ANONYMOUS] = { .name = ".anonymous", .type = BLOBMSG_TYPE_BOOL },
 759 };
 760
 761 static const char *resolveuuid(const char *volname)
 762 {
 763         struct blob_attr *tb[__UCI_FSTAB_MAX];
 764         struct blob_attr *cur;
 765         const char *mntname;
 766         char *tmpvolname, *replc;
 767         int rem, res;
 768
 769         blobmsg_for_each_attr(cur, fstabinfo, rem) {
 770                 blobmsg_parse(uci_fstab_policy, __UCI_FSTAB_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 771
 772                 if (!tb[UCI_FSTAB_UUID])
 773                         continue;
 774
 775                 if (tb[UCI_FSTAB_ANONYMOUS] && blobmsg_get_bool(tb[UCI_FSTAB_ANONYMOUS]))
 776                         continue;
 777
 778                 mntname = blobmsg_name(cur);
 779                 if (!mntname)
 780                         continue;
 781
 782                 tmpvolname = strdup(volname);
 783                 while ((replc = strchr(tmpvolname, '-')))
 784                         *replc = '_';
 785
 786                 res = strcmp(tmpvolname, mntname);
 787                 free(tmpvolname);
 788
 789                 if (!res)
 790                         return blobmsg_get_string(tb[UCI_FSTAB_UUID]);
 791         };
 792
 793         return volname;
 794 };
 795
 796 /* check status of each required volume */
 797 static int checkvolumes(struct blob_attr *volumes)
 798 {
 799         struct blob_attr *cur;
 800         int rem;
 801
 802         blobmsg_for_each_attr(cur, volumes, rem) {
 803                 if (checkblock(resolveuuid(blobmsg_get_string(cur))))
 804                         return 1;
 805         }
 806
 807         return 0;
 808 }
 809
 810 static void block_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 811 {
 812         blockinfo = blob_memdup(blobmsg_data(msg));
 813 }
 814
 815 static void fstab_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 816 {
 817         fstabinfo = blob_memdup(blobmsg_data(msg));
 818 }
 819
 820 static int uxc_boot(void)
 821 {
 822         struct blob_attr *cur, *tb[__CONF_MAX];
 823         struct runtime_state *s;
 824         static struct blob_buf req;
 825         int rem, ret = 0;
 826         char *name;
 827         unsigned int id;
 828
 829         ret = ubus_lookup_id(ctx, "block", &id);
 830         if (ret)
 831                 return ENOENT;
 832
 833         ret = ubus_invoke(ctx, id, "info", NULL, block_cb, NULL, 3000);
 834         if (ret)
 835                 return ENXIO;
 836
 837         ret = ubus_lookup_id(ctx, "uci", &id);
 838         if (ret)
 839                 return ENOENT;
 840
 841         blob_buf_init(&req, 0);
 842         blobmsg_add_string(&req, "config", "fstab");
 843         blobmsg_add_string(&req, "type", "mount");
 844
 845         ret = ubus_invoke(ctx, id, "get", req.head, fstab_cb, NULL, 3000);
 846         if (ret)
 847                 return ENXIO;
 848
 849         blobmsg_for_each_attr(cur, blob_data(conf.head), rem) {
 850                 blobmsg_parse(conf_policy, __CONF_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 851                 if (!tb[CONF_NAME] || !tb[CONF_PATH] || !tb[CONF_AUTOSTART] || !blobmsg_get_bool(tb[CONF_AUTOSTART]))
 852                         continue;
 853
 854                 s = avl_find_element(&runtime, blobmsg_get_string(tb[CONF_NAME]), s, avl);
 855                 if (s)
 856                         continue;
 857
 858                 /* make sure all volumes are ready before starting */
 859                 if (tb[CONF_VOLUMES])
 860                         if (checkvolumes(tb[CONF_VOLUMES]))
 861                                 continue;
 862
 863                 name = strdup(blobmsg_get_string(tb[CONF_NAME]));
 864                 ret += uxc_create(name, true);
 865                 free(name);
 866         }
 867
 868         return ret;
 869 }
 870
 871 static int uxc_delete(char *name, bool force)
 872 {
 873         struct blob_attr *cur, *tb[__CONF_MAX];
 874         struct runtime_state *s = NULL;
 875         static struct blob_buf req;
 876         uint32_t id;
 877         int rem, ret = 0;
 878         bool found = false;
 879         char *fname;
 880         struct stat sb;
 881
 882         blobmsg_for_each_attr(cur, blob_data(conf.head), rem) {
 883                 blobmsg_parse(conf_policy, __CONF_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 884                 if (!tb[CONF_NAME] || !tb[CONF_PATH])
 885                         continue;
 886
 887                 if (strcmp(name, blobmsg_get_string(tb[CONF_NAME])))
 888                         continue;
 889
 890                 fname = strdup(blobmsg_name(cur));
 891                 if (!fname)
 892                         return errno;
 893
 894                 found = true;
 895                 break;
 896         }
 897
 898         if (!found)
 899                 return ENOENT;
 900
 901         s = avl_find_element(&runtime, name, s, avl);
 902
 903         if (s && s->running) {
 904                 if (force) {
 905                         ret = uxc_kill(name, SIGKILL);
 906                         if (ret)
 907                                 goto errout;
 908
 909                 } else {
 910                         ret = EWOULDBLOCK;
 911                         goto errout;
 912                 }
 913         }
 914
 915         if (s) {
 916                 ret = ubus_lookup_id(ctx, "container", &id);
 917                 if (ret)
 918                         goto errout;
 919
 920                 blob_buf_init(&req, 0);
 921                 blobmsg_add_string(&req, "name", s->container_name);
 922                 blobmsg_add_string(&req, "instance", s->instance_name);
 923
 924                 if (ubus_invoke(ctx, id, "delete", req.head, NULL, NULL, 3000)) {
 925                         blob_buf_free(&req);
 926                         ret=EIO;
 927                         goto errout;
 928                 }
 929         }
 930
 931         if (stat(fname, &sb) == -1) {
 932                 ret=ENOENT;
 933                 goto errout;
 934         }
 935
 936         if (unlink(fname) == -1)
 937                 ret=errno;
 938
 939 errout:
 940         free(fname);
 941         return ret;
 942 }
 943
 944 static void reload_conf(void)
 945 {
 946         blob_buf_free(&conf);
 947         conf_load();
 948 }
 949
 950 int main(int argc, char **argv)
 951 {
 952         enum uxc_cmd cmd = CMD_UNKNOWN;
 953         int ret = EINVAL;
 954         char *bundle = NULL;
 955         char *pidfile = NULL;
 956         char *tmprwsize = NULL;
 957         char *writepath = NULL;
 958         char *requiredmounts = NULL;
 959         bool autostart = false;
 960         bool force = false;
 961         int signal = SIGTERM;
 962         int c;
 963
 964         if (argc < 2)
 965                 return usage();
 966
 967         ctx = ubus_connect(NULL);
 968         if (!ctx)
 969                 return ENODEV;
 970
 971         ret = conf_load();
 972         if (ret)
 973                 goto out;
 974
 975         ret = runtime_load();
 976         if (ret)
 977                 goto conf_out;
 978
 979         while (true) {
 980                 int option_index = 0;
 981                 c = getopt_long(argc, argv, OPT_ARGS, long_options, &option_index);
 982                 if (c == -1)
 983                         break;
 984
 985                 switch (c) {
 986                         case 'a':
 987                                 autostart = true;
 988                                 break;
 989
 990                         case 'b':
 991                                 bundle = optarg;
 992                                 break;
 993
 994                         case 'f':
 995                                 force = true;
 996                                 break;
 997
 998                         case 'p':
 999                                 pidfile = optarg;
1000                                 break;
1001
1002                         case 't':
1003                                 tmprwsize = optarg;
1004                                 break;
1005
1006                         case 'v':
1007                                 verbose = true;
1008                                 break;
1009
1010                         case 'V':
1011                                 printf("uxc %s\n", UXC_VERSION);
1012                                 exit(0);
1013
1014                         case 'w':
1015                                 writepath = optarg;
1016                                 break;
1017
1018                         case 'm':
1019                                 requiredmounts = optarg;
1020                                 break;
1021                 }
1022         }
1023
1024         if (optind == argc)
1025                 goto usage_out;
1026
1027         if (!strcmp("list", argv[optind]))
1028                 cmd = CMD_LIST;
1029         else if (!strcmp("boot", argv[optind]))
1030                 cmd = CMD_BOOT;
1031         else if(!strcmp("start", argv[optind]))
1032                 cmd = CMD_START;
1033         else if(!strcmp("state", argv[optind]))
1034                 cmd = CMD_STATE;
1035         else if(!strcmp("kill", argv[optind]))
1036                 cmd = CMD_KILL;
1037         else if(!strcmp("enable", argv[optind]))
1038                 cmd = CMD_ENABLE;
1039         else if(!strcmp("disable", argv[optind]))
1040                 cmd = CMD_DISABLE;
1041         else if(!strcmp("delete", argv[optind]))
1042                 cmd = CMD_DELETE;
1043         else if(!strcmp("create", argv[optind]))
1044                 cmd = CMD_CREATE;
1045
1046         switch (cmd) {
1047                 case CMD_LIST:
1048                         ret = uxc_list();
1049                         break;
1050
1051                 case CMD_BOOT:
1052                         ret = uxc_boot();
1053                         break;
1054
1055                 case CMD_START:
1056                         if (optind != argc - 2)
1057                                 goto usage_out;
1058
1059                         ret = uxc_start(argv[optind + 1]);
1060                         break;
1061
1062                 case CMD_STATE:
1063                         if (optind != argc - 2)
1064                                 goto usage_out;
1065
1066                         ret = uxc_state(argv[optind + 1]);
1067                         break;
1068
1069                 case CMD_KILL:
1070                         if (optind == (argc - 3))
1071                                 signal = atoi(argv[optind + 2]);
1072                         else if (optind > argc - 2)
1073                                 goto usage_out;
1074
1075                         ret = uxc_kill(argv[optind + 1], signal);
1076                         break;
1077
1078                 case CMD_ENABLE:
1079                         if (optind != argc - 2)
1080                                 goto usage_out;
1081
1082                         ret = uxc_set(argv[optind + 1], NULL, true, false, NULL, NULL, NULL, NULL);
1083                         break;
1084
1085                 case CMD_DISABLE:
1086                         if (optind != argc - 2)
1087                                 goto usage_out;
1088
1089                         ret = uxc_set(argv[optind + 1], NULL, false, false, NULL, NULL, NULL, NULL);
1090                         break;
1091
1092                 case CMD_DELETE:
1093                         if (optind != argc - 2)
1094                                 goto usage_out;
1095
1096                         ret = uxc_delete(argv[optind + 1], force);
1097                         break;
1098
1099                 case CMD_CREATE:
1100                         if (optind != argc - 2)
1101                                 goto usage_out;
1102
1103                         if (bundle) {
1104                                 ret = uxc_set(argv[optind + 1], bundle, autostart, true, pidfile, tmprwsize, writepath, requiredmounts);
1105                                 if (ret)
1106                                         goto runtime_out;
1107
1108                                 reload_conf();
1109                         }
1110
1111                         ret = uxc_create(argv[optind + 1], false);
1112                         break;
1113
1114                 default:
1115                         goto usage_out;
1116         }
1117
1118         goto runtime_out;
1119
1120 usage_out:
1121         usage();
1122 runtime_out:
1123         runtime_free();
1124 conf_out:
1125         blob_buf_free(&conf);
1126 out:
1127         ubus_free(ctx);
1128
1129         if (ret != 0)
1130                 fprintf(stderr, "uxc error: %s\n", strerror(ret));
1131
1132         return ret;
1133 }