execute.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <dirent.h>
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <signal.h>
  29 #include <sys/socket.h>
  30 #include <sys/un.h>
  31 #include <sys/prctl.h>
  32 #include <linux/sched.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <grp.h>
  36 #include <pwd.h>
  37
  38 #include "execute.h"
  39 #include "strv.h"
  40 #include "macro.h"
  41 #include "util.h"
  42 #include "log.h"
  43 #include "ioprio.h"
  44 #include "securebits.h"
  45 #include "cgroup.h"
  46
  47 static int close_fds(int except[], unsigned n_except) {
  48         DIR *d;
  49         struct dirent *de;
  50         int r = 0;
  51
  52         /* Modifies the fds array! (sorts it) */
  53
  54         if (!(d = opendir("/proc/self/fd")))
  55                 return -errno;
  56
  57         while ((de = readdir(d))) {
  58                 int fd;
  59
  60                 if (de->d_name[0] == '.')
  61                         continue;
  62
  63                 if ((r = safe_atoi(de->d_name, &fd)) < 0)
  64                         goto finish;
  65
  66                 if (fd < 3)
  67                         continue;
  68
  69                 if (fd == dirfd(d))
  70                         continue;
  71
  72                 if (except) {
  73                         bool found;
  74                         unsigned i;
  75
  76                         found = false;
  77                         for (i = 0; i < n_except; i++)
  78                                 if (except[i] == fd) {
  79                                         found = true;
  80                                         break;
  81                                 }
  82
  83                         if (found)
  84                                 continue;
  85                 }
  86
  87                 if ((r = close_nointr(fd)) < 0)
  88                         goto finish;
  89         }
  90
  91 finish:
  92         closedir(d);
  93         return r;
  94 }
  95
  96 static int shift_fds(int fds[], unsigned n_fds) {
  97         int start, restart_from;
  98
  99         if (n_fds <= 0)
 100                 return 0;
 101
 102         assert(fds);
 103
 104         start = 0;
 105         for (;;) {
 106                 int i;
 107
 108                 restart_from = -1;
 109
 110                 for (i = start; i < (int) n_fds; i++) {
 111                         int nfd;
 112
 113                         /* Already at right index? */
 114                         if (fds[i] == i+3)
 115                                 continue;
 116
 117                         if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
 118                                 return -errno;
 119
 120                         assert_se(close_nointr(fds[i]) == 0);
 121                         fds[i] = nfd;
 122
 123                         /* Hmm, the fd we wanted isn't free? Then
 124                          * let's remember that and try again from here*/
 125                         if (nfd != i+3 && restart_from < 0)
 126                                 restart_from = i;
 127                 }
 128
 129                 if (restart_from < 0)
 130                         break;
 131
 132                 start = restart_from;
 133         }
 134
 135         return 0;
 136 }
 137
 138 static int flags_fds(int fds[], unsigned n_fds, bool nonblock) {
 139         unsigned i;
 140
 141         if (n_fds <= 0)
 142                 return 0;
 143
 144         assert(fds);
 145
 146         /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
 147
 148         for (i = 0; i < n_fds; i++) {
 149                 int flags;
 150
 151                 if ((flags = fcntl(fds[i], F_GETFL, 0)) < 0)
 152                         return -errno;
 153
 154                 if (nonblock)
 155                         flags |= O_NONBLOCK;
 156                 else
 157                         flags &= ~O_NONBLOCK;
 158
 159                 if (fcntl(fds[i], F_SETFL, flags) < 0)
 160                         return -errno;
 161
 162                 /* We unconditionally drop FD_CLOEXEC from the fds,
 163                  * since after all we want to pass these fds to our
 164                  * children */
 165                 if ((flags = fcntl(fds[i], F_GETFD, 0)) < 0)
 166                         return -errno;
 167
 168                 if (fcntl(fds[i], F_SETFD, flags &~FD_CLOEXEC) < 0)
 169                         return -errno;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int replace_null_fd(int fd, int flags) {
 176         int nfd;
 177         assert(fd >= 0);
 178
 179         close_nointr(fd);
 180
 181         if ((nfd = open("/dev/null", flags|O_NOCTTY)) < 0)
 182                 return -errno;
 183
 184         if (nfd != fd) {
 185                 close_nointr_nofail(nfd);
 186                 return -EIO;
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int setup_output(const ExecContext *context, const char *ident) {
 193         int r;
 194
 195         assert(context);
 196
 197         switch (context->output) {
 198
 199         case EXEC_OUTPUT_CONSOLE:
 200                 return 0;
 201
 202         case EXEC_OUTPUT_NULL:
 203
 204                 if ((r = replace_null_fd(STDOUT_FILENO, O_WRONLY)) < 0 ||
 205                     (r = replace_null_fd(STDERR_FILENO, O_WRONLY)) < 0)
 206                         return r;
 207
 208                 return 0;
 209
 210         case EXEC_OUTPUT_KERNEL:
 211         case EXEC_OUTPUT_SYSLOG: {
 212
 213                 int fd;
 214                 union {
 215                         struct sockaddr sa;
 216                         struct sockaddr_un un;
 217                 } sa;
 218
 219                 close_nointr(STDOUT_FILENO);
 220                 close_nointr(STDERR_FILENO);
 221
 222                 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 223                         return -errno;
 224
 225                 if (fd != STDOUT_FILENO) {
 226                         close_nointr_nofail(fd);
 227                         return -EIO;
 228                 }
 229
 230                 zero(sa);
 231                 sa.sa.sa_family = AF_UNIX;
 232                 strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
 233
 234                 if (connect(fd, &sa.sa, sizeof(sa)) < 0) {
 235                         close_nointr_nofail(fd);
 236                         return -errno;
 237                 }
 238
 239                 if (shutdown(fd, SHUT_RD) < 0) {
 240                         close_nointr_nofail(fd);
 241                         return -errno;
 242                 }
 243
 244                 if ((fd = dup(fd)) < 0) {
 245                         close_nointr_nofail(fd);
 246                         return -errno;
 247                 }
 248
 249                 if (fd != STDERR_FILENO) {
 250                         close_nointr_nofail(fd);
 251                         return -EIO;
 252                 }
 253
 254                 /* We speak a very simple protocol between log server
 255                  * and client: one line for the log destination (kmsg
 256                  * or syslog), followed by the priority field,
 257                  * followed by the process name. Since we replaced
 258                  * stdin/stderr we simple use stdio to write to
 259                  * it. Note that we use stderr, to minimize buffer
 260                  * flushing issues. */
 261
 262                 fprintf(stderr,
 263                         "%s\n"
 264                         "%i\n"
 265                         "%s\n",
 266                         context->output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog",
 267                         context->syslog_priority,
 268                         context->syslog_identifier ? context->syslog_identifier : ident);
 269
 270                 return 0;
 271         }
 272
 273         default:
 274                 assert_not_reached("Unknown output type");
 275         }
 276 }
 277
 278 static int setup_input(const ExecContext *context) {
 279         int r;
 280
 281         assert(context);
 282
 283         switch (context->input) {
 284
 285         case EXEC_INPUT_CONSOLE:
 286                 return 0;
 287
 288         case EXEC_INPUT_NULL:
 289                 if ((r = replace_null_fd(STDIN_FILENO, O_RDONLY)) < 0)
 290                         return r;
 291
 292                 return 0;
 293
 294         default:
 295                 assert_not_reached("Unknown input type");
 296         }
 297 }
 298
 299 static int get_group_creds(const char *groupname, gid_t *gid) {
 300         struct group *g;
 301         unsigned long lu;
 302
 303         assert(groupname);
 304         assert(gid);
 305
 306         /* We enforce some special rules for gid=0: in order to avoid
 307          * NSS lookups for root we hardcode its data. */
 308
 309         if (streq(groupname, "root") || streq(groupname, "0")) {
 310                 *gid = 0;
 311                 return 0;
 312         }
 313
 314         if (safe_atolu(groupname, &lu) >= 0) {
 315                 errno = 0;
 316                 g = getgrgid((gid_t) lu);
 317         } else {
 318                 errno = 0;
 319                 g = getgrnam(groupname);
 320         }
 321
 322         if (!g)
 323                 return errno != 0 ? -errno : -ESRCH;
 324
 325         *gid = g->gr_gid;
 326         return 0;
 327 }
 328
 329 static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
 330         struct passwd *p;
 331         unsigned long lu;
 332
 333         assert(username);
 334         assert(*username);
 335         assert(uid);
 336         assert(gid);
 337         assert(home);
 338
 339         /* We enforce some special rules for uid=0: in order to avoid
 340          * NSS lookups for root we hardcode its data. */
 341
 342         if (streq(*username, "root") || streq(*username, "0")) {
 343                 *username = "root";
 344                 *uid = 0;
 345                 *gid = 0;
 346                 *home = "/root";
 347                 return 0;
 348         }
 349
 350         if (safe_atolu(*username, &lu) >= 0) {
 351                 errno = 0;
 352                 p = getpwuid((uid_t) lu);
 353
 354                 /* If there are multiple users with the same id, make
 355                  * sure to leave $USER to the configured value instead
 356                  * of the first occurence in the database. However if
 357                  * the uid was configured by a numeric uid, then let's
 358                  * pick the real username from /etc/passwd. */
 359                 if (*username && p)
 360                         *username = p->pw_name;
 361         } else {
 362                 errno = 0;
 363                 p = getpwnam(*username);
 364         }
 365
 366         if (!p)
 367                 return errno != 0 ? -errno : -ESRCH;
 368
 369         *uid = p->pw_uid;
 370         *gid = p->pw_gid;
 371         *home = p->pw_dir;
 372         return 0;
 373 }
 374
 375 static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
 376         bool keep_groups = false;
 377         int r;
 378
 379         assert(context);
 380
 381         /* Lookup and ser GID and supplementary group list. Here too
 382          * we avoid NSS lookups for gid=0. */
 383
 384         if (context->group || username) {
 385
 386                 if (context->group)
 387                         if ((r = get_group_creds(context->group, &gid)) < 0)
 388                                 return r;
 389
 390                 /* First step, initialize groups from /etc/groups */
 391                 if (username && gid != 0) {
 392                         if (initgroups(username, gid) < 0)
 393                                 return -errno;
 394
 395                         keep_groups = true;
 396                 }
 397
 398                 /* Second step, set our gids */
 399                 if (setresgid(gid, gid, gid) < 0)
 400                         return -errno;
 401         }
 402
 403         if (context->supplementary_groups) {
 404                 int ngroups_max, k;
 405                 gid_t *gids;
 406                 char **i;
 407
 408                 /* Final step, initialize any manually set supplementary groups */
 409                 ngroups_max = (int) sysconf(_SC_NGROUPS_MAX);
 410
 411                 if (!(gids = new(gid_t, ngroups_max)))
 412                         return -ENOMEM;
 413
 414                 if (keep_groups) {
 415                         if ((k = getgroups(ngroups_max, gids)) < 0) {
 416                                 free(gids);
 417                                 return -errno;
 418                         }
 419                 } else
 420                         k = 0;
 421
 422                 STRV_FOREACH(i, context->supplementary_groups) {
 423
 424                         if (k >= ngroups_max) {
 425                                 free(gids);
 426                                 return -E2BIG;
 427                         }
 428
 429                         if ((r = get_group_creds(*i, gids+k)) < 0) {
 430                                 free(gids);
 431                                 return r;
 432                         }
 433
 434                         k++;
 435                 }
 436
 437                 if (setgroups(k, gids) < 0) {
 438                         free(gids);
 439                         return -errno;
 440                 }
 441
 442                 free(gids);
 443         }
 444
 445         return 0;
 446 }
 447
 448 static int enforce_user(const ExecContext *context, uid_t uid) {
 449         int r;
 450         assert(context);
 451
 452         /* Sets (but doesn't lookup) the uid and make sure we keep the
 453          * capabilities while doing so. */
 454
 455         if (context->capabilities) {
 456                 cap_t d;
 457                 static const cap_value_t bits[] = {
 458                         CAP_SETUID,   /* Necessary so that we can run setresuid() below */
 459                         CAP_SETPCAP   /* Necessary so that we can set PR_SET_SECUREBITS later on */
 460                 };
 461
 462                 /* First step: If we need to keep capabilities but
 463                  * drop privileges we need to make sure we keep our
 464                  * caps, whiel we drop priviliges. */
 465                 if (uid != 0) {
 466                         int sb = context->secure_bits|SECURE_KEEP_CAPS;
 467
 468                         if (prctl(PR_GET_SECUREBITS) != sb)
 469                                 if (prctl(PR_SET_SECUREBITS, sb) < 0)
 470                                         return -errno;
 471                 }
 472
 473                 /* Second step: set the capabilites. This will reduce
 474                  * the capabilities to the minimum we need. */
 475
 476                 if (!(d = cap_dup(context->capabilities)))
 477                         return -errno;
 478
 479                 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
 480                     cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
 481                         r = -errno;
 482                         cap_free(d);
 483                         return r;
 484                 }
 485
 486                 if (cap_set_proc(d) < 0) {
 487                         r = -errno;
 488                         cap_free(d);
 489                         return r;
 490                 }
 491
 492                 cap_free(d);
 493         }
 494
 495         /* Third step: actually set the uids */
 496         if (setresuid(uid, uid, uid) < 0)
 497                 return -errno;
 498
 499         /* At this point we should have all necessary capabilities but
 500            are otherwise a normal user. However, the caps might got
 501            corrupted due to the setresuid() so we need clean them up
 502            later. This is done outside of this call. */
 503
 504         return 0;
 505 }
 506
 507 int exec_spawn(const ExecCommand *command,
 508                const ExecContext *context,
 509                int *fds, unsigned n_fds,
 510                bool apply_permissions,
 511                bool apply_chroot,
 512                CGroupBonding *cgroup_bondings,
 513                pid_t *ret) {
 514
 515         pid_t pid;
 516         int r;
 517
 518         assert(command);
 519         assert(context);
 520         assert(ret);
 521         assert(fds || n_fds <= 0);
 522
 523         log_debug("About to execute %s", command->path);
 524
 525         if (cgroup_bondings)
 526                 if ((r = cgroup_bonding_realize_list(cgroup_bondings)))
 527                         return r;
 528
 529         if ((pid = fork()) < 0)
 530                 return -errno;
 531
 532         if (pid == 0) {
 533                 int i;
 534                 sigset_t ss;
 535                 const char *username = NULL, *home = NULL;
 536                 uid_t uid = (uid_t) -1;
 537                 gid_t gid = (gid_t) -1;
 538                 char **our_env = NULL, **final_env = NULL;
 539                 unsigned n_env = 0;
 540
 541                 /* child */
 542
 543                 if (sigemptyset(&ss) < 0 ||
 544                     sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
 545                         r = EXIT_SIGNAL_MASK;
 546                         goto fail;
 547                 }
 548
 549                 if (setpgid(0, 0) < 0) {
 550                         r = EXIT_PGID;
 551                         goto fail;
 552                 }
 553
 554                 umask(context->umask);
 555
 556                 if (setup_input(context) < 0) {
 557                         r = EXIT_INPUT;
 558                         goto fail;
 559                 }
 560
 561                 if (setup_output(context, file_name_from_path(command->path)) < 0) {
 562                         r = EXIT_OUTPUT;
 563                         goto fail;
 564                 }
 565
 566                 if (cgroup_bondings)
 567                         if ((r = cgroup_bonding_install_list(cgroup_bondings, 0)) < 0) {
 568                                 r = EXIT_CGROUP;
 569                                 goto fail;
 570                         }
 571
 572                 if (context->oom_adjust_set) {
 573                         char t[16];
 574
 575                         snprintf(t, sizeof(t), "%i", context->oom_adjust);
 576                         char_array_0(t);
 577
 578                         if (write_one_line_file("/proc/self/oom_adj", t) < 0) {
 579                                 r = EXIT_OOM_ADJUST;
 580                                 goto fail;
 581                         }
 582                 }
 583
 584                 if (context->nice_set)
 585                         if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
 586                                 r = EXIT_NICE;
 587                                 goto fail;
 588                         }
 589
 590                 if (context->cpu_sched_set) {
 591                         struct sched_param param;
 592
 593                         zero(param);
 594                         param.sched_priority = context->cpu_sched_priority;
 595
 596                         if (sched_setscheduler(0, context->cpu_sched_policy |
 597                                                (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
 598                                 r = EXIT_SETSCHEDULER;
 599                                 goto fail;
 600                         }
 601                 }
 602
 603                 if (context->cpu_affinity_set)
 604                         if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) {
 605                                 r = EXIT_CPUAFFINITY;
 606                                 goto fail;
 607                         }
 608
 609                 if (context->ioprio_set)
 610                         if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
 611                                 r = EXIT_IOPRIO;
 612                                 goto fail;
 613                         }
 614
 615                 if (context->timer_slack_ns_set)
 616                         if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) {
 617                                 r = EXIT_TIMERSLACK;
 618                                 goto fail;
 619                         }
 620
 621                 if (context->user) {
 622                         username = context->user;
 623                         if (get_user_creds(&username, &uid, &gid, &home) < 0) {
 624                                 r = EXIT_USER;
 625                                 goto fail;
 626                         }
 627                 }
 628
 629                 if (apply_permissions)
 630                         if (enforce_groups(context, username, uid) < 0) {
 631                                 r = EXIT_GROUP;
 632                                 goto fail;
 633                         }
 634
 635                 if (apply_chroot) {
 636                         if (context->root_directory)
 637                                 if (chroot(context->root_directory) < 0) {
 638                                         r = EXIT_CHROOT;
 639                                         goto fail;
 640                                 }
 641
 642                         if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
 643                                 r = EXIT_CHDIR;
 644                                 goto fail;
 645                         }
 646                 } else {
 647
 648                         char *d;
 649
 650                         if (asprintf(&d, "%s/%s",
 651                                      context->root_directory ? context->root_directory : "",
 652                                      context->working_directory ? context->working_directory : "") < 0) {
 653                                 r = EXIT_MEMORY;
 654                                 goto fail;
 655                         }
 656
 657                         if (chdir(d) < 0) {
 658                                 free(d);
 659                                 r = EXIT_CHDIR;
 660                                 goto fail;
 661                         }
 662
 663                         free(d);
 664                 }
 665
 666                 if (close_fds(fds, n_fds) < 0 ||
 667                     shift_fds(fds, n_fds) < 0 ||
 668                     flags_fds(fds, n_fds, context->non_blocking) < 0) {
 669                         r = EXIT_FDS;
 670                         goto fail;
 671                 }
 672
 673                 if (apply_permissions) {
 674
 675                         for (i = 0; i < RLIMIT_NLIMITS; i++) {
 676                                 if (!context->rlimit[i])
 677                                         continue;
 678
 679                                 if (setrlimit(i, context->rlimit[i]) < 0) {
 680                                         r = EXIT_LIMITS;
 681                                         goto fail;
 682                                 }
 683                         }
 684
 685                         if (context->user)
 686                                 if (enforce_user(context, uid) < 0) {
 687                                         r = EXIT_USER;
 688                                         goto fail;
 689                                 }
 690
 691                         /* PR_GET_SECUREBITS is not priviliged, while
 692                          * PR_SET_SECUREBITS is. So to suppress
 693                          * potential EPERMs we'll try not to call
 694                          * PR_SET_SECUREBITS unless necessary. */
 695                         if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
 696                                 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
 697                                         r = EXIT_SECUREBITS;
 698                                         goto fail;
 699                                 }
 700
 701                         if (context->capabilities)
 702                                 if (cap_set_proc(context->capabilities) < 0) {
 703                                         r = EXIT_CAPABILITIES;
 704                                         goto fail;
 705                                 }
 706                 }
 707
 708                 if (!(our_env = new0(char*, 6))) {
 709                         r = EXIT_MEMORY;
 710                         goto fail;
 711                 }
 712
 713                 if (n_fds > 0)
 714                         if (asprintf(our_env + n_env++, "LISTEN_PID=%llu", (unsigned long long) getpid()) < 0 ||
 715                             asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
 716                                 r = EXIT_MEMORY;
 717                                 goto fail;
 718                         }
 719
 720                 if (home)
 721                         if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
 722                                 r = EXIT_MEMORY;
 723                                 goto fail;
 724                         }
 725
 726                 if (username)
 727                         if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
 728                             asprintf(our_env + n_env++, "USER=%s", username) < 0) {
 729                                 r = EXIT_MEMORY;
 730                                 goto fail;
 731                         }
 732
 733                 if (!(final_env = strv_env_merge(environ, our_env, context->environment, NULL))) {
 734                         r = EXIT_MEMORY;
 735                         goto fail;
 736                 }
 737
 738                 execve(command->path, command->argv, final_env);
 739                 r = EXIT_EXEC;
 740
 741         fail:
 742                 strv_free(our_env);
 743                 strv_free(final_env);
 744
 745                 _exit(r);
 746         }
 747
 748
 749         log_debug("Forked %s as %llu", command->path, (unsigned long long) pid);
 750
 751         *ret = pid;
 752         return 0;
 753 }
 754
 755 void exec_context_init(ExecContext *c) {
 756         assert(c);
 757
 758         c->umask = 0002;
 759         c->oom_adjust = 0;
 760         c->oom_adjust_set = false;
 761         c->nice = 0;
 762         c->nice_set = false;
 763         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
 764         c->ioprio_set = false;
 765         c->cpu_sched_policy = SCHED_OTHER;
 766         c->cpu_sched_priority = 0;
 767         c->cpu_sched_set = false;
 768         CPU_ZERO(&c->cpu_affinity);
 769         c->cpu_affinity_set = false;
 770
 771         c->input = 0;
 772         c->output = 0;
 773         c->syslog_priority = LOG_DAEMON|LOG_INFO;
 774
 775         c->secure_bits = 0;
 776         c->capability_bounding_set_drop = 0;
 777 }
 778
 779 void exec_context_done(ExecContext *c) {
 780         unsigned l;
 781
 782         assert(c);
 783
 784         strv_free(c->environment);
 785         c->environment = NULL;
 786
 787         for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
 788                 free(c->rlimit[l]);
 789                 c->rlimit[l] = NULL;
 790         }
 791
 792         free(c->working_directory);
 793         c->working_directory = NULL;
 794         free(c->root_directory);
 795         c->root_directory = NULL;
 796
 797         free(c->syslog_identifier);
 798         c->syslog_identifier = NULL;
 799
 800         free(c->user);
 801         c->user = NULL;
 802
 803         free(c->group);
 804         c->group = NULL;
 805
 806         strv_free(c->supplementary_groups);
 807         c->supplementary_groups = NULL;
 808
 809         if (c->capabilities) {
 810                 cap_free(c->capabilities);
 811                 c->capabilities = NULL;
 812         }
 813 }
 814
 815 void exec_command_free_list(ExecCommand *c) {
 816         ExecCommand *i;
 817
 818         while ((i = c)) {
 819                 LIST_REMOVE(ExecCommand, command, c, i);
 820
 821                 free(i->path);
 822                 strv_free(i->argv);
 823                 free(i);
 824         }
 825 }
 826
 827 void exec_command_free_array(ExecCommand **c, unsigned n) {
 828         unsigned i;
 829
 830         for (i = 0; i < n; i++) {
 831                 exec_command_free_list(c[i]);
 832                 c[i] = NULL;
 833         }
 834 }
 835
 836 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
 837         char ** e;
 838         unsigned i;
 839
 840         assert(c);
 841         assert(f);
 842
 843         if (!prefix)
 844                 prefix = "";
 845
 846         fprintf(f,
 847                 "%sUMask: %04o\n"
 848                 "%sWorkingDirectory: %s\n"
 849                 "%sRootDirectory: %s\n"
 850                 "%sNonBlocking: %s\n",
 851                 prefix, c->umask,
 852                 prefix, c->working_directory ? c->working_directory : "/",
 853                 prefix, c->root_directory ? c->root_directory : "/",
 854                 prefix, yes_no(c->non_blocking));
 855
 856         if (c->environment)
 857                 for (e = c->environment; *e; e++)
 858                         fprintf(f, "%sEnvironment: %s\n", prefix, *e);
 859
 860         if (c->nice_set)
 861                 fprintf(f,
 862                         "%sNice: %i\n",
 863                         prefix, c->nice);
 864
 865         if (c->oom_adjust_set)
 866                 fprintf(f,
 867                         "%sOOMAdjust: %i\n",
 868                         prefix, c->oom_adjust);
 869
 870         for (i = 0; i < RLIM_NLIMITS; i++)
 871                 if (c->rlimit[i])
 872                         fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
 873
 874         if (c->ioprio_set)
 875                 fprintf(f,
 876                         "%sIOSchedulingClass: %s\n"
 877                         "%sIOPriority: %i\n",
 878                         prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
 879                         prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
 880
 881         if (c->cpu_sched_set)
 882                 fprintf(f,
 883                         "%sCPUSchedulingPolicy: %s\n"
 884                         "%sCPUSchedulingPriority: %i\n"
 885                         "%sCPUSchedulingResetOnFork: %s\n",
 886                         prefix, sched_policy_to_string(c->cpu_sched_policy),
 887                         prefix, c->cpu_sched_priority,
 888                         prefix, yes_no(c->cpu_sched_reset_on_fork));
 889
 890         if (c->cpu_affinity_set) {
 891                 fprintf(f, "%sCPUAffinity:", prefix);
 892                 for (i = 0; i < CPU_SETSIZE; i++)
 893                         if (CPU_ISSET(i, &c->cpu_affinity))
 894                                 fprintf(f, " %i", i);
 895                 fputs("\n", f);
 896         }
 897
 898         if (c->timer_slack_ns_set)
 899                 fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns);
 900
 901         fprintf(f,
 902                 "%sInput: %s\n"
 903                 "%sOutput: %s\n",
 904                 prefix, exec_input_to_string(c->input),
 905                 prefix, exec_output_to_string(c->output));
 906
 907         if (c->output == EXEC_OUTPUT_SYSLOG || c->output == EXEC_OUTPUT_KERNEL)
 908                 fprintf(f,
 909                         "%sSyslogFacility: %s\n"
 910                         "%sSyslogLevel: %s\n",
 911                         prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)),
 912                         prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
 913
 914         if (c->capabilities) {
 915                 char *t;
 916                 if ((t = cap_to_text(c->capabilities, NULL))) {
 917                         fprintf(f, "%sCapabilities: %s\n",
 918                                 prefix, t);
 919                         cap_free(t);
 920                 }
 921         }
 922
 923         if (c->secure_bits)
 924                 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
 925                         prefix,
 926                         (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
 927                         (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
 928                         (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
 929                         (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
 930                         (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
 931                         (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
 932
 933         if (c->capability_bounding_set_drop) {
 934                 fprintf(f, "%sCapabilityBoundingSetDrop:", prefix);
 935
 936                 for (i = 0; i <= CAP_LAST_CAP; i++)
 937                         if (c->capability_bounding_set_drop & (1 << i)) {
 938                                 char *t;
 939
 940                                 if ((t = cap_to_name(i))) {
 941                                         fprintf(f, " %s", t);
 942                                         free(t);
 943                                 }
 944                         }
 945
 946                 fputs("\n", f);
 947         }
 948
 949         if (c->user)
 950                 fprintf(f, "%sUser: %s", prefix, c->user);
 951         if (c->group)
 952                 fprintf(f, "%sGroup: %s", prefix, c->group);
 953
 954         if (c->supplementary_groups) {
 955                 char **g;
 956
 957                 fprintf(f, "%sSupplementaryGroups:", prefix);
 958
 959                 STRV_FOREACH(g, c->supplementary_groups)
 960                         fprintf(f, " %s", *g);
 961
 962                 fputs("\n", f);
 963         }
 964 }
 965
 966 void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) {
 967         assert(s);
 968
 969         s->pid = pid;
 970         s->code = code;
 971         s->status = status;
 972         s->timestamp = now(CLOCK_REALTIME);
 973 }
 974
 975 char *exec_command_line(ExecCommand *c) {
 976         size_t k;
 977         char *n, *p, **a;
 978         bool first = true;
 979
 980         assert(c);
 981         assert(c->argv);
 982
 983         k = 1;
 984         STRV_FOREACH(a, c->argv)
 985                 k += strlen(*a)+3;
 986
 987         if (!(n = new(char, k)))
 988                 return NULL;
 989
 990         p = n;
 991         STRV_FOREACH(a, c->argv) {
 992
 993                 if (!first)
 994                         *(p++) = ' ';
 995                 else
 996                         first = false;
 997
 998                 if (strpbrk(*a, WHITESPACE)) {
 999                         *(p++) = '\'';
1000                         p = stpcpy(p, *a);
1001                         *(p++) = '\'';
1002                 } else
1003                         p = stpcpy(p, *a);
1004
1005         }
1006
1007         *p = 0;
1008
1009         /* FIXME: this doesn't really handle arguments that have
1010          * spaces and ticks in them */
1011
1012         return n;
1013 }
1014
1015 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
1016         char *cmd;
1017
1018         assert(c);
1019         assert(f);
1020
1021         if (!prefix)
1022                 prefix = "";
1023
1024         cmd = exec_command_line(c);
1025
1026         fprintf(f,
1027                 "%sCommand Line: %s\n",
1028                 prefix, cmd ? cmd : strerror(ENOMEM));
1029
1030         free(cmd);
1031 }
1032
1033 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
1034         assert(f);
1035
1036         if (!prefix)
1037                 prefix = "";
1038
1039         LIST_FOREACH(command, c, c)
1040                 exec_command_dump(c, f, prefix);
1041 }
1042
1043 void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
1044         ExecCommand *end;
1045
1046         assert(l);
1047         assert(e);
1048
1049         if (*l) {
1050                 /* It's kinda important that we keep the order here */
1051                 LIST_FIND_TAIL(ExecCommand, command, *l, end);
1052                 LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
1053         } else
1054               *l = e;
1055 }
1056
1057 static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
1058         [EXEC_OUTPUT_CONSOLE] = "console",
1059         [EXEC_OUTPUT_NULL] = "null",
1060         [EXEC_OUTPUT_SYSLOG] = "syslog",
1061         [EXEC_OUTPUT_KERNEL] = "kernel"
1062 };
1063
1064 DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
1065
1066 static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
1067         [EXEC_INPUT_NULL] = "null",
1068         [EXEC_INPUT_CONSOLE] = "console"
1069 };
1070
1071 DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);