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