load-fragment.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #include <linux/oom.h>
   4 #include <assert.h>
   5 #include <errno.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8 #include <fcntl.h>
   9
  10 #include "unit.h"
  11 #include "strv.h"
  12 #include "conf-parser.h"
  13 #include "load-fragment.h"
  14 #include "log.h"
  15
  16 static int config_parse_deps(
  17                 const char *filename,
  18                 unsigned line,
  19                 const char *section,
  20                 const char *lvalue,
  21                 const char *rvalue,
  22                 void *data,
  23                 void *userdata) {
  24
  25         UnitDependency d = PTR_TO_UINT(data);
  26         Unit *u = userdata;
  27         char *w;
  28         size_t l;
  29         char *state;
  30
  31         assert(filename);
  32         assert(lvalue);
  33         assert(rvalue);
  34
  35         FOREACH_WORD(w, &l, rvalue, state) {
  36                 char *t;
  37                 int r;
  38                 Unit *other;
  39
  40                 if (!(t = strndup(w, l)))
  41                         return -ENOMEM;
  42
  43                 r = manager_load_unit(u->meta.manager, t, &other);
  44                 free(t);
  45
  46                 if (r < 0)
  47                         return r;
  48
  49                 if ((r = unit_add_dependency(u, d, other)) < 0)
  50                         return r;
  51         }
  52
  53         return 0;
  54 }
  55
  56 static int config_parse_names(
  57                 const char *filename,
  58                 unsigned line,
  59                 const char *section,
  60                 const char *lvalue,
  61                 const char *rvalue,
  62                 void *data,
  63                 void *userdata) {
  64
  65         Unit *u = userdata;
  66         char *w;
  67         size_t l;
  68         char *state;
  69
  70         assert(filename);
  71         assert(lvalue);
  72         assert(rvalue);
  73         assert(data);
  74
  75         FOREACH_WORD(w, &l, rvalue, state) {
  76                 char *t;
  77                 int r;
  78                 Unit *other;
  79
  80                 if (!(t = strndup(w, l)))
  81                         return -ENOMEM;
  82
  83                 other = manager_get_unit(u->meta.manager, t);
  84
  85                 if (other) {
  86
  87                         if (other != u) {
  88
  89                                 if (other->meta.load_state != UNIT_STUB) {
  90                                         free(t);
  91                                         return -EEXIST;
  92                                 }
  93
  94                                 if ((r = unit_merge(u, other)) < 0) {
  95                                         free(t);
  96                                         return r;
  97                                 }
  98                         }
  99
 100                 } else {
 101                         if ((r = unit_add_name(u, t)) < 0) {
 102                                 free(t);
 103                                 return r;
 104                         }
 105                 }
 106
 107                 free(t);
 108         }
 109
 110         return 0;
 111 }
 112
 113 static int config_parse_listen(
 114                 const char *filename,
 115                 unsigned line,
 116                 const char *section,
 117                 const char *lvalue,
 118                 const char *rvalue,
 119                 void *data,
 120                 void *userdata) {
 121
 122         int r;
 123         SocketPort *p;
 124         Socket *s;
 125
 126         assert(filename);
 127         assert(lvalue);
 128         assert(rvalue);
 129         assert(data);
 130
 131         s = (Socket*) data;
 132
 133         if (!(p = new0(SocketPort, 1)))
 134                 return -ENOMEM;
 135
 136         if (streq(lvalue, "ListenFIFO")) {
 137                 p->type = SOCKET_FIFO;
 138
 139                 if (!(p->path = strdup(rvalue))) {
 140                         free(p);
 141                         return -ENOMEM;
 142                 }
 143         } else {
 144                 p->type = SOCKET_SOCKET;
 145
 146                 if ((r = socket_address_parse(&p->address, rvalue)) < 0) {
 147                         log_error("[%s:%u] Failed to parse address value: %s", filename, line, rvalue);
 148                         free(p);
 149                         return r;
 150                 }
 151
 152                 if (streq(lvalue, "ListenStream"))
 153                         p->address.type = SOCK_STREAM;
 154                 else if (streq(lvalue, "ListenDatagram"))
 155                         p->address.type = SOCK_DGRAM;
 156                 else {
 157                         assert(streq(lvalue, "ListenSequentialPacket"));
 158                         p->address.type = SOCK_SEQPACKET;
 159                 }
 160
 161                 if (socket_address_family(&p->address) != AF_LOCAL && p->address.type == SOCK_SEQPACKET) {
 162                         free(p);
 163                         return -EPROTONOSUPPORT;
 164                 }
 165         }
 166
 167         p->fd = -1;
 168         LIST_PREPEND(SocketPort, port, s->ports, p);
 169
 170         return 0;
 171 }
 172
 173 static int config_parse_socket_bind(
 174                 const char *filename,
 175                 unsigned line,
 176                 const char *section,
 177                 const char *lvalue,
 178                 const char *rvalue,
 179                 void *data,
 180                 void *userdata) {
 181
 182         int r;
 183         Socket *s;
 184
 185         assert(filename);
 186         assert(lvalue);
 187         assert(rvalue);
 188         assert(data);
 189
 190         s = (Socket*) data;
 191
 192         if ((r = parse_boolean(rvalue)) < 0) {
 193                 log_error("[%s:%u] Failed to parse bind IPv6 only value: %s", filename, line, rvalue);
 194                 return r;
 195         }
 196
 197         s->bind_ipv6_only = r ? SOCKET_ADDRESS_IPV6_ONLY : SOCKET_ADDRESS_BOTH;
 198
 199         return 0;
 200 }
 201
 202 static int config_parse_nice(
 203                 const char *filename,
 204                 unsigned line,
 205                 const char *section,
 206                 const char *lvalue,
 207                 const char *rvalue,
 208                 void *data,
 209                 void *userdata) {
 210
 211         int *i = data, priority, r;
 212
 213         assert(filename);
 214         assert(lvalue);
 215         assert(rvalue);
 216         assert(data);
 217
 218         if ((r = safe_atoi(rvalue, &priority)) < 0) {
 219                 log_error("[%s:%u] Failed to parse nice priority: %s", filename, line, rvalue);
 220                 return r;
 221         }
 222
 223         if (priority < PRIO_MIN || priority >= PRIO_MAX) {
 224                 log_error("[%s:%u] Nice priority out of range: %s", filename, line, rvalue);
 225                 return -ERANGE;
 226         }
 227
 228         *i = priority;
 229         return 0;
 230 }
 231
 232 static int config_parse_oom_adjust(
 233                 const char *filename,
 234                 unsigned line,
 235                 const char *section,
 236                 const char *lvalue,
 237                 const char *rvalue,
 238                 void *data,
 239                 void *userdata) {
 240
 241         int *i = data, oa, r;
 242
 243         assert(filename);
 244         assert(lvalue);
 245         assert(rvalue);
 246         assert(data);
 247
 248         if ((r = safe_atoi(rvalue, &oa)) < 0) {
 249                 log_error("[%s:%u] Failed to parse OOM adjust value: %s", filename, line, rvalue);
 250                 return r;
 251         }
 252
 253         if (oa < OOM_DISABLE || oa > OOM_ADJUST_MAX) {
 254                 log_error("[%s:%u] OOM adjust value out of range: %s", filename, line, rvalue);
 255                 return -ERANGE;
 256         }
 257
 258         *i = oa;
 259         return 0;
 260 }
 261
 262 static int config_parse_umask(
 263                 const char *filename,
 264                 unsigned line,
 265                 const char *section,
 266                 const char *lvalue,
 267                 const char *rvalue,
 268                 void *data,
 269                 void *userdata) {
 270
 271         mode_t *m = data;
 272         long l;
 273         char *x = NULL;
 274
 275         assert(filename);
 276         assert(lvalue);
 277         assert(rvalue);
 278         assert(data);
 279
 280         errno = 0;
 281         l = strtol(rvalue, &x, 8);
 282         if (!x || *x || errno) {
 283                 log_error("[%s:%u] Failed to parse umask value: %s", filename, line, rvalue);
 284                 return errno ? -errno : -EINVAL;
 285         }
 286
 287         if (l < 0000 || l > 0777) {
 288                 log_error("[%s:%u] umask value out of range: %s", filename, line, rvalue);
 289                 return -ERANGE;
 290         }
 291
 292         *m = (mode_t) l;
 293         return 0;
 294 }
 295
 296 static int config_parse_exec(
 297                 const char *filename,
 298                 unsigned line,
 299                 const char *section,
 300                 const char *lvalue,
 301                 const char *rvalue,
 302                 void *data,
 303                 void *userdata) {
 304
 305         ExecCommand **e = data, *ee, *nce = NULL;
 306         char **n;
 307         char *w;
 308         unsigned k;
 309         size_t l;
 310         char *state;
 311
 312         assert(filename);
 313         assert(lvalue);
 314         assert(rvalue);
 315         assert(data);
 316
 317         k = 0;
 318         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 319                 k++;
 320
 321         if (!(n = new(char*, k+1)))
 322                 return -ENOMEM;
 323
 324         k = 0;
 325         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 326                 if (!(n[k++] = strndup(w, l)))
 327                         goto fail;
 328
 329         n[k] = NULL;
 330
 331         if (!n[0] || n[0][0] != '/') {
 332                 log_error("[%s:%u] Invalid executable path in command line: %s", filename, line, rvalue);
 333                 strv_free(n);
 334                 return -EINVAL;
 335         }
 336
 337         if (!(nce = new0(ExecCommand, 1)))
 338                 goto fail;
 339
 340         nce->argv = n;
 341         if (!(nce->path = strdup(n[0])))
 342                 goto fail;
 343
 344         if (*e) {
 345                 /* It's kinda important that we keep the order here */
 346                 LIST_FIND_TAIL(ExecCommand, command, *e, ee);
 347                 LIST_INSERT_AFTER(ExecCommand, command, *e, ee, nce);
 348         } else
 349                 *e = nce;
 350
 351         return 0;
 352
 353 fail:
 354         for (; k > 0; k--)
 355                 free(n[k-1]);
 356         free(n);
 357
 358         free(nce);
 359
 360         return -ENOMEM;
 361 }
 362
 363 static int config_parse_usec(
 364                 const char *filename,
 365                 unsigned line,
 366                 const char *section,
 367                 const char *lvalue,
 368                 const char *rvalue,
 369                 void *data,
 370                 void *userdata) {
 371
 372         usec_t *usec = data;
 373         unsigned long long u;
 374         int r;
 375
 376         assert(filename);
 377         assert(lvalue);
 378         assert(rvalue);
 379         assert(data);
 380
 381         if ((r = safe_atollu(rvalue, &u)) < 0) {
 382                 log_error("[%s:%u] Failed to parse time value: %s", filename, line, rvalue);
 383                 return r;
 384         }
 385
 386         /* We actually assume the user configures seconds. Later on we
 387          * might choose to support suffixes for time values, to
 388          * configure bigger or smaller units */
 389
 390         *usec = u * USEC_PER_SEC;
 391
 392         return 0;
 393 }
 394
 395 static int config_parse_service_type(
 396                 const char *filename,
 397                 unsigned line,
 398                 const char *section,
 399                 const char *lvalue,
 400                 const char *rvalue,
 401                 void *data,
 402                 void *userdata) {
 403
 404         Service *s = data;
 405
 406         assert(filename);
 407         assert(lvalue);
 408         assert(rvalue);
 409         assert(data);
 410
 411         if (streq(rvalue, "forking"))
 412                 s->type = SERVICE_FORKING;
 413         else if (streq(rvalue, "simple"))
 414                 s->type = SERVICE_SIMPLE;
 415         else {
 416                 log_error("[%s:%u] Failed to parse service type: %s", filename, line, rvalue);
 417                 return -EBADMSG;
 418         }
 419
 420         return 0;
 421 }
 422
 423 static int config_parse_service_restart(
 424                 const char *filename,
 425                 unsigned line,
 426                 const char *section,
 427                 const char *lvalue,
 428                 const char *rvalue,
 429                 void *data,
 430                 void *userdata) {
 431
 432         Service *s = data;
 433
 434         assert(filename);
 435         assert(lvalue);
 436         assert(rvalue);
 437         assert(data);
 438
 439         if (streq(rvalue, "once"))
 440                 s->restart = SERVICE_ONCE;
 441         else if (streq(rvalue, "on-success"))
 442                 s->type = SERVICE_RESTART_ON_SUCCESS;
 443         else if (streq(rvalue, "always"))
 444                 s->type = SERVICE_RESTART_ALWAYS;
 445         else {
 446                 log_error("[%s:%u] Failed to parse service type: %s", filename, line, rvalue);
 447                 return -EBADMSG;
 448         }
 449
 450         return 0;
 451 }
 452
 453 #define FOLLOW_MAX 8
 454
 455 static char *build_path(const char *path, const char *filename) {
 456         char *e, *r;
 457         size_t k;
 458
 459         assert(path);
 460         assert(filename);
 461
 462         /* This removes the last component of path and appends
 463          * filename, unless the latter is absolute anyway or the
 464          * former isn't */
 465
 466         if (filename[0] == '/')
 467                 return strdup(filename);
 468
 469         if (!(e = strrchr(path, '/')))
 470                 return strdup(filename);
 471
 472         k = strlen(filename);
 473         if (!(r = new(char, e-path+1+k+1)))
 474                 return NULL;
 475
 476         memcpy(r, path, e-path+1);
 477         memcpy(r+(e-path)+1, filename, k+1);
 478
 479         return r;
 480 }
 481
 482 static int open_follow(const char **filename, FILE **_f, Set *names) {
 483         unsigned c;
 484         int fd, r;
 485         FILE *f;
 486         char *n = NULL;
 487         const char *fn;
 488
 489         assert(filename);
 490         assert(*filename);
 491         assert(_f);
 492         assert(names);
 493
 494         fn = *filename;
 495
 496         for (c = 0; c < FOLLOW_MAX; c++) {
 497                 char *target, *k, *name;
 498
 499                 /* Add the file name we are currently looking at to
 500                  * the names of this unit */
 501                 name = file_name_from_path(fn);
 502                 if (!set_get(names, name)) {
 503
 504                         if (!(name = strdup(name))) {
 505                                 r = -ENOMEM;
 506                                 goto finish;
 507                         }
 508
 509                         if ((r = set_put(names, name)) < 0) {
 510                                 free(name);
 511                                 goto finish;
 512                         }
 513
 514                         free(name);
 515                 }
 516
 517                 /* Try to open the file name, but don' if its a symlink */
 518                 fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
 519                 if (fd >= 0 || errno != ELOOP)
 520                         break;
 521
 522                 /* Hmm, so this is a symlink. Let's read the name, and follow it manually */
 523                 if ((r = readlink_malloc(fn, &target)) < 0)
 524                         goto finish;
 525
 526                 k = build_path(fn, target);
 527                 free(target);
 528
 529                 if (!k) {
 530                         r = -ENOMEM;
 531                         goto finish;
 532                 }
 533
 534                 free(n);
 535                 fn = n = k;
 536         }
 537
 538         if (c >= FOLLOW_MAX) {
 539                 r = -ELOOP;
 540                 goto finish;
 541         }
 542
 543         if (fd < 0) {
 544                 r = -errno;
 545                 goto finish;
 546         }
 547
 548         if (!(f = fdopen(fd, "r"))) {
 549                 r = -errno;
 550                 assert(close_nointr(fd) == 0);
 551                 goto finish;
 552         }
 553
 554         *_f = f;
 555         *filename = fn;
 556         r = 0;
 557
 558 finish:
 559         free(n);
 560         return r;
 561 }
 562
 563 int unit_load_fragment(Unit *u) {
 564
 565         static const char* const section_table[_UNIT_TYPE_MAX] = {
 566                 [UNIT_SERVICE]   = "Service",
 567                 [UNIT_TIMER]     = "Timer",
 568                 [UNIT_SOCKET]    = "Socket",
 569                 [UNIT_TARGET]    = "Target",
 570                 [UNIT_DEVICE]    = "Device",
 571                 [UNIT_MOUNT]     = "Mount",
 572                 [UNIT_AUTOMOUNT] = "Automount",
 573                 [UNIT_SNAPSHOT]  = "Snapshot"
 574         };
 575
 576 #define EXEC_CONTEXT_CONFIG_ITEMS(context, section) \
 577                 { "Directory",              config_parse_path,            &(context).directory,                              section   }, \
 578                 { "User",                   config_parse_string,          &(context).user,                                   section   }, \
 579                 { "Group",                  config_parse_string,          &(context).group,                                  section   }, \
 580                 { "SupplementaryGroups",    config_parse_strv,            &(context).supplementary_groups,                   section   }, \
 581                 { "Nice",                   config_parse_nice,            &(context).nice,                                   section   }, \
 582                 { "OOMAdjust",              config_parse_oom_adjust,      &(context).oom_adjust,                             section   }, \
 583                 { "UMask",                  config_parse_umask,           &(context).umask,                                  section   }, \
 584                 { "Environment",            config_parse_strv,            &(context).environment,                            section   }
 585
 586         const ConfigItem items[] = {
 587                 { "Names",                  config_parse_names,           u,                                                 "Meta"    },
 588                 { "Description",            config_parse_string,          &u->meta.description,                              "Meta"    },
 589                 { "Requires",               config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES),                        "Meta"    },
 590                 { "SoftRequires",           config_parse_deps,            UINT_TO_PTR(UNIT_SOFT_REQUIRES),                   "Meta"    },
 591                 { "Wants",                  config_parse_deps,            UINT_TO_PTR(UNIT_WANTS),                           "Meta"    },
 592                 { "Requisite",              config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE),                       "Meta"    },
 593                 { "SoftRequisite",          config_parse_deps,            UINT_TO_PTR(UNIT_SOFT_REQUISITE),                  "Meta"    },
 594                 { "Conflicts",              config_parse_deps,            UINT_TO_PTR(UNIT_CONFLICTS),                       "Meta"    },
 595                 { "Before",                 config_parse_deps,            UINT_TO_PTR(UNIT_BEFORE),                          "Meta"    },
 596                 { "After",                  config_parse_deps,            UINT_TO_PTR(UNIT_AFTER),                           "Meta"    },
 597
 598                 { "PIDFile",                config_parse_path,            &u->service.pid_file,                              "Service" },
 599                 { "ExecStartPre",           config_parse_exec,            &u->service.exec_command[SERVICE_EXEC_START_PRE],  "Service" },
 600                 { "ExecStart",              config_parse_exec,            &u->service.exec_command[SERVICE_EXEC_START],      "Service" },
 601                 { "ExecStartPost",          config_parse_exec,            &u->service.exec_command[SERVICE_EXEC_START_POST], "Service" },
 602                 { "ExecReload",             config_parse_exec,            &u->service.exec_command[SERVICE_EXEC_RELOAD],     "Service" },
 603                 { "ExecStop",               config_parse_exec,            &u->service.exec_command[SERVICE_EXEC_STOP],       "Service" },
 604                 { "ExecStopPost",           config_parse_exec,            &u->service.exec_command[SERVICE_EXEC_STOP_POST],  "Service" },
 605                 { "RestartSec",             config_parse_usec,            &u->service.restart_usec,                          "Service" },
 606                 { "TimeoutSec",             config_parse_usec,            &u->service.timeout_usec,                          "Service" },
 607                 { "Type",                   config_parse_service_type,    &u->service,                                       "Service" },
 608                 { "Restart",                config_parse_service_restart, &u->service,                                       "Service" },
 609                 EXEC_CONTEXT_CONFIG_ITEMS(u->service.exec_context, "Service"),
 610
 611                 { "ListenStream",           config_parse_listen,          &u->socket,                                        "Socket"  },
 612                 { "ListenDatagram",         config_parse_listen,          &u->socket,                                        "Socket"  },
 613                 { "ListenSequentialPacket", config_parse_listen,          &u->socket,                                        "Socket"  },
 614                 { "ListenFIFO",             config_parse_listen,          &u->socket,                                        "Socket"  },
 615                 { "BindIPv6Only",           config_parse_socket_bind,     &u->socket,                                        "Socket"  },
 616                 { "Backlog",                config_parse_unsigned,        &u->socket.backlog,                                "Socket"  },
 617                 { "ExecStartPre",           config_parse_exec,            &u->service.exec_command[SOCKET_EXEC_START_PRE],   "Socket"  },
 618                 { "ExecStartPost",          config_parse_exec,            &u->service.exec_command[SOCKET_EXEC_START_POST],  "Socket"  },
 619                 { "ExecStopPre",            config_parse_exec,            &u->service.exec_command[SOCKET_EXEC_STOP_PRE],    "Socket"  },
 620                 { "ExecStopPost",           config_parse_exec,            &u->service.exec_command[SOCKET_EXEC_STOP_POST],   "Socket"  },
 621                 EXEC_CONTEXT_CONFIG_ITEMS(u->socket.exec_context, "Socket"),
 622
 623                 EXEC_CONTEXT_CONFIG_ITEMS(u->automount.exec_context, "Automount"),
 624
 625                 { NULL, NULL, NULL, NULL }
 626         };
 627
 628 #undef EXEC_CONTEXT_CONFIG_ITEMS
 629
 630         char *t, *k;
 631         int r;
 632         const char *sections[3];
 633         Iterator i;
 634         Set *symlink_names;
 635
 636         assert(u);
 637         assert(u->meta.load_state == UNIT_STUB);
 638
 639         sections[0] = "Meta";
 640         sections[1] = section_table[u->meta.type];
 641         sections[2] = NULL;
 642
 643         if (!(symlink_names = set_new(string_hash_func, string_compare_func)))
 644                 return -ENOMEM;
 645
 646         /* Try to find a name we can load this with */
 647         SET_FOREACH(t, u->meta.names, i) {
 648                 FILE *f;
 649                 char *fn;
 650
 651                 /* Clear the symlink name set first */
 652                 while ((k = set_steal_first(symlink_names)))
 653                         free(k);
 654
 655                 /* Instead of opening the path right away, we manually
 656                  * follow all symlinks and add their name to our unit
 657                  * name set while doing so */
 658                 fn = t;
 659                 if ((r = open_follow((const char**) &fn, &f, symlink_names)) < 0) {
 660                         if (r == -ENOENT)
 661                                 continue;
 662
 663                         goto finish;
 664                 }
 665
 666                 /* Now, parse the file contents */
 667                 r = config_parse(fn, f, sections, items, u);
 668                 if (fn != t)
 669                         free(fn);
 670                 if (r < 0)
 671                         goto finish;
 672
 673                 /* Let's try to add in all symlink names we found */
 674                 while ((k = set_steal_first(symlink_names)))
 675                         if ((r = unit_add_name(u, k)) < 0)
 676                                 goto finish;
 677
 678                 /* Yay, we succeeded! Now let's call this our identifier */
 679                 u->meta.id = t;
 680                 goto finish;
 681         }
 682
 683
 684         r = -ENOENT;
 685
 686 finish:
 687         while ((k = set_steal_first(symlink_names)))
 688                 free(k);
 689
 690         set_free(symlink_names);
 691
 692         return r;
 693 }