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