src/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 #include <sys/mount.h>
  38 #include <linux/fs.h>
  39
  40 #include "execute.h"
  41 #include "strv.h"
  42 #include "macro.h"
  43 #include "util.h"
  44 #include "log.h"
  45 #include "ioprio.h"
  46 #include "securebits.h"
  47 #include "cgroup.h"
  48 #include "namespace.h"
  49 #include "tcpwrap.h"
  50
  51 /* This assumes there is a 'tty' group */
  52 #define TTY_MODE 0620
  53
  54 static int shift_fds(int fds[], unsigned n_fds) {
  55         int start, restart_from;
  56
  57         if (n_fds <= 0)
  58                 return 0;
  59
  60         /* Modifies the fds array! (sorts it) */
  61
  62         assert(fds);
  63
  64         start = 0;
  65         for (;;) {
  66                 int i;
  67
  68                 restart_from = -1;
  69
  70                 for (i = start; i < (int) n_fds; i++) {
  71                         int nfd;
  72
  73                         /* Already at right index? */
  74                         if (fds[i] == i+3)
  75                                 continue;
  76
  77                         if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
  78                                 return -errno;
  79
  80                         close_nointr_nofail(fds[i]);
  81                         fds[i] = nfd;
  82
  83                         /* Hmm, the fd we wanted isn't free? Then
  84                          * let's remember that and try again from here*/
  85                         if (nfd != i+3 && restart_from < 0)
  86                                 restart_from = i;
  87                 }
  88
  89                 if (restart_from < 0)
  90                         break;
  91
  92                 start = restart_from;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
  99         unsigned i;
 100         int r;
 101
 102         if (n_fds <= 0)
 103                 return 0;
 104
 105         assert(fds);
 106
 107         /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
 108
 109         for (i = 0; i < n_fds; i++) {
 110
 111                 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
 112                         return r;
 113
 114                 /* We unconditionally drop FD_CLOEXEC from the fds,
 115                  * since after all we want to pass these fds to our
 116                  * children */
 117
 118                 if ((r = fd_cloexec(fds[i], false)) < 0)
 119                         return r;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static const char *tty_path(const ExecContext *context) {
 126         assert(context);
 127
 128         if (context->tty_path)
 129                 return context->tty_path;
 130
 131         return "/dev/console";
 132 }
 133
 134 static int open_null_as(int flags, int nfd) {
 135         int fd, r;
 136
 137         assert(nfd >= 0);
 138
 139         if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
 140                 return -errno;
 141
 142         if (fd != nfd) {
 143                 r = dup2(fd, nfd) < 0 ? -errno : nfd;
 144                 close_nointr_nofail(fd);
 145         } else
 146                 r = nfd;
 147
 148         return r;
 149 }
 150
 151 static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) {
 152         int fd, r;
 153         union {
 154                 struct sockaddr sa;
 155                 struct sockaddr_un un;
 156         } sa;
 157
 158         assert(context);
 159         assert(output < _EXEC_OUTPUT_MAX);
 160         assert(ident);
 161         assert(nfd >= 0);
 162
 163         if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 164                 return -errno;
 165
 166         zero(sa);
 167         sa.sa.sa_family = AF_UNIX;
 168         strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
 169
 170         if (connect(fd, &sa.sa, sizeof(sa)) < 0) {
 171                 close_nointr_nofail(fd);
 172                 return -errno;
 173         }
 174
 175         if (shutdown(fd, SHUT_RD) < 0) {
 176                 close_nointr_nofail(fd);
 177                 return -errno;
 178         }
 179
 180         /* We speak a very simple protocol between log server
 181          * and client: one line for the log destination (kmsg
 182          * or syslog), followed by the priority field,
 183          * followed by the process name. Since we replaced
 184          * stdin/stderr we simple use stdio to write to
 185          * it. Note that we use stderr, to minimize buffer
 186          * flushing issues. */
 187
 188         dprintf(fd,
 189                 "%s\n"
 190                 "%i\n"
 191                 "%s\n"
 192                 "%i\n",
 193                 output == EXEC_OUTPUT_KMSG ? "kmsg" : "syslog",
 194                 context->syslog_priority,
 195                 context->syslog_identifier ? context->syslog_identifier : ident,
 196                 !context->syslog_no_prefix);
 197
 198         if (fd != nfd) {
 199                 r = dup2(fd, nfd) < 0 ? -errno : nfd;
 200                 close_nointr_nofail(fd);
 201         } else
 202                 r = nfd;
 203
 204         return r;
 205 }
 206 static int open_terminal_as(const char *path, mode_t mode, int nfd) {
 207         int fd, r;
 208
 209         assert(path);
 210         assert(nfd >= 0);
 211
 212         if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
 213                 return fd;
 214
 215         if (fd != nfd) {
 216                 r = dup2(fd, nfd) < 0 ? -errno : nfd;
 217                 close_nointr_nofail(fd);
 218         } else
 219                 r = nfd;
 220
 221         return r;
 222 }
 223
 224 static bool is_terminal_input(ExecInput i) {
 225         return
 226                 i == EXEC_INPUT_TTY ||
 227                 i == EXEC_INPUT_TTY_FORCE ||
 228                 i == EXEC_INPUT_TTY_FAIL;
 229 }
 230
 231 static int fixup_input(ExecInput std_input, int socket_fd) {
 232
 233         if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
 234                 return EXEC_INPUT_NULL;
 235
 236         return std_input;
 237 }
 238
 239 static int fixup_output(ExecOutput std_output, int socket_fd) {
 240
 241         if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
 242                 return EXEC_OUTPUT_INHERIT;
 243
 244         return std_output;
 245 }
 246
 247 static int setup_input(const ExecContext *context, int socket_fd) {
 248         ExecInput i;
 249
 250         assert(context);
 251
 252         i = fixup_input(context->std_input, socket_fd);
 253
 254         switch (i) {
 255
 256         case EXEC_INPUT_NULL:
 257                 return open_null_as(O_RDONLY, STDIN_FILENO);
 258
 259         case EXEC_INPUT_TTY:
 260         case EXEC_INPUT_TTY_FORCE:
 261         case EXEC_INPUT_TTY_FAIL: {
 262                 int fd, r;
 263
 264                 if ((fd = acquire_terminal(
 265                                      tty_path(context),
 266                                      i == EXEC_INPUT_TTY_FAIL,
 267                                      i == EXEC_INPUT_TTY_FORCE,
 268                                      false)) < 0)
 269                         return fd;
 270
 271                 if (fd != STDIN_FILENO) {
 272                         r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
 273                         close_nointr_nofail(fd);
 274                 } else
 275                         r = STDIN_FILENO;
 276
 277                 return r;
 278         }
 279
 280         case EXEC_INPUT_SOCKET:
 281                 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
 282
 283         default:
 284                 assert_not_reached("Unknown input type");
 285         }
 286 }
 287
 288 static int setup_output(const ExecContext *context, int socket_fd, const char *ident) {
 289         ExecOutput o;
 290         ExecInput i;
 291
 292         assert(context);
 293         assert(ident);
 294
 295         i = fixup_input(context->std_input, socket_fd);
 296         o = fixup_output(context->std_output, socket_fd);
 297
 298         /* This expects the input is already set up */
 299
 300         switch (o) {
 301
 302         case EXEC_OUTPUT_INHERIT:
 303
 304                 /* If the input is connected to a terminal, inherit that... */
 305                 if (i != EXEC_INPUT_NULL)
 306                         return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
 307
 308                 /* For PID 1 stdout is always connected to /dev/null,
 309                  * hence reopen the console if out parent is PID1. */
 310                 if (getppid() == 1)
 311                         return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
 312
 313                 return STDOUT_FILENO;
 314
 315         case EXEC_OUTPUT_NULL:
 316                 return open_null_as(O_WRONLY, STDOUT_FILENO);
 317
 318         case EXEC_OUTPUT_TTY:
 319                 if (is_terminal_input(i))
 320                         return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
 321
 322                 /* We don't reset the terminal if this is just about output */
 323                 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
 324
 325         case EXEC_OUTPUT_SYSLOG:
 326         case EXEC_OUTPUT_KMSG:
 327                 return connect_logger_as(context, o, ident, STDOUT_FILENO);
 328
 329         case EXEC_OUTPUT_SOCKET:
 330                 assert(socket_fd >= 0);
 331                 return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
 332
 333         default:
 334                 assert_not_reached("Unknown output type");
 335         }
 336 }
 337
 338 static int setup_error(const ExecContext *context, int socket_fd, const char *ident) {
 339         ExecOutput o, e;
 340         ExecInput i;
 341
 342         assert(context);
 343         assert(ident);
 344
 345         i = fixup_input(context->std_input, socket_fd);
 346         o = fixup_output(context->std_output, socket_fd);
 347         e = fixup_output(context->std_error, socket_fd);
 348
 349         /* This expects the input and output are already set up */
 350
 351         /* Don't change the stderr file descriptor if we inherit all
 352          * the way and are not on a tty */
 353         if (e == EXEC_OUTPUT_INHERIT &&
 354             o == EXEC_OUTPUT_INHERIT &&
 355             i != EXEC_INPUT_NULL &&
 356             getppid () != 1)
 357                 return STDERR_FILENO;
 358
 359         /* Duplicate form stdout if possible */
 360         if (e == o || e == EXEC_OUTPUT_INHERIT)
 361                 return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
 362
 363         switch (e) {
 364
 365         case EXEC_OUTPUT_NULL:
 366                 return open_null_as(O_WRONLY, STDERR_FILENO);
 367
 368         case EXEC_OUTPUT_TTY:
 369                 if (is_terminal_input(i))
 370                         return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
 371
 372                 /* We don't reset the terminal if this is just about output */
 373                 return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
 374
 375         case EXEC_OUTPUT_SYSLOG:
 376         case EXEC_OUTPUT_KMSG:
 377                 return connect_logger_as(context, e, ident, STDERR_FILENO);
 378
 379         case EXEC_OUTPUT_SOCKET:
 380                 assert(socket_fd >= 0);
 381                 return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
 382
 383         default:
 384                 assert_not_reached("Unknown error type");
 385         }
 386 }
 387
 388 static int chown_terminal(int fd, uid_t uid) {
 389         struct stat st;
 390
 391         assert(fd >= 0);
 392
 393         /* This might fail. What matters are the results. */
 394         (void) fchown(fd, uid, -1);
 395         (void) fchmod(fd, TTY_MODE);
 396
 397         if (fstat(fd, &st) < 0)
 398                 return -errno;
 399
 400         if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
 401                 return -EPERM;
 402
 403         return 0;
 404 }
 405
 406 static int setup_confirm_stdio(const ExecContext *context,
 407                                int *_saved_stdin,
 408                                int *_saved_stdout) {
 409         int fd = -1, saved_stdin, saved_stdout = -1, r;
 410
 411         assert(context);
 412         assert(_saved_stdin);
 413         assert(_saved_stdout);
 414
 415         /* This returns positive EXIT_xxx return values instead of
 416          * negative errno style values! */
 417
 418         if ((saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3)) < 0)
 419                 return EXIT_STDIN;
 420
 421         if ((saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3)) < 0) {
 422                 r = EXIT_STDOUT;
 423                 goto fail;
 424         }
 425
 426         if ((fd = acquire_terminal(
 427                              tty_path(context),
 428                              context->std_input == EXEC_INPUT_TTY_FAIL,
 429                              context->std_input == EXEC_INPUT_TTY_FORCE,
 430                              false)) < 0) {
 431                 r = EXIT_STDIN;
 432                 goto fail;
 433         }
 434
 435         if (chown_terminal(fd, getuid()) < 0) {
 436                 r = EXIT_STDIN;
 437                 goto fail;
 438         }
 439
 440         if (dup2(fd, STDIN_FILENO) < 0) {
 441                 r = EXIT_STDIN;
 442                 goto fail;
 443         }
 444
 445         if (dup2(fd, STDOUT_FILENO) < 0) {
 446                 r = EXIT_STDOUT;
 447                 goto fail;
 448         }
 449
 450         if (fd >= 2)
 451                 close_nointr_nofail(fd);
 452
 453         *_saved_stdin = saved_stdin;
 454         *_saved_stdout = saved_stdout;
 455
 456         return 0;
 457
 458 fail:
 459         if (saved_stdout >= 0)
 460                 close_nointr_nofail(saved_stdout);
 461
 462         if (saved_stdin >= 0)
 463                 close_nointr_nofail(saved_stdin);
 464
 465         if (fd >= 0)
 466                 close_nointr_nofail(fd);
 467
 468         return r;
 469 }
 470
 471 static int restore_confirm_stdio(const ExecContext *context,
 472                                  int *saved_stdin,
 473                                  int *saved_stdout,
 474                                  bool *keep_stdin,
 475                                  bool *keep_stdout) {
 476
 477         assert(context);
 478         assert(saved_stdin);
 479         assert(*saved_stdin >= 0);
 480         assert(saved_stdout);
 481         assert(*saved_stdout >= 0);
 482
 483         /* This returns positive EXIT_xxx return values instead of
 484          * negative errno style values! */
 485
 486         if (is_terminal_input(context->std_input)) {
 487
 488                 /* The service wants terminal input. */
 489
 490                 *keep_stdin = true;
 491                 *keep_stdout =
 492                         context->std_output == EXEC_OUTPUT_INHERIT ||
 493                         context->std_output == EXEC_OUTPUT_TTY;
 494
 495         } else {
 496                 /* If the service doesn't want a controlling terminal,
 497                  * then we need to get rid entirely of what we have
 498                  * already. */
 499
 500                 if (release_terminal() < 0)
 501                         return EXIT_STDIN;
 502
 503                 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
 504                         return EXIT_STDIN;
 505
 506                 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
 507                         return EXIT_STDOUT;
 508
 509                 *keep_stdout = *keep_stdin = false;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static int get_group_creds(const char *groupname, gid_t *gid) {
 516         struct group *g;
 517         unsigned long lu;
 518
 519         assert(groupname);
 520         assert(gid);
 521
 522         /* We enforce some special rules for gid=0: in order to avoid
 523          * NSS lookups for root we hardcode its data. */
 524
 525         if (streq(groupname, "root") || streq(groupname, "0")) {
 526                 *gid = 0;
 527                 return 0;
 528         }
 529
 530         if (safe_atolu(groupname, &lu) >= 0) {
 531                 errno = 0;
 532                 g = getgrgid((gid_t) lu);
 533         } else {
 534                 errno = 0;
 535                 g = getgrnam(groupname);
 536         }
 537
 538         if (!g)
 539                 return errno != 0 ? -errno : -ESRCH;
 540
 541         *gid = g->gr_gid;
 542         return 0;
 543 }
 544
 545 static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
 546         struct passwd *p;
 547         unsigned long lu;
 548
 549         assert(username);
 550         assert(*username);
 551         assert(uid);
 552         assert(gid);
 553         assert(home);
 554
 555         /* We enforce some special rules for uid=0: in order to avoid
 556          * NSS lookups for root we hardcode its data. */
 557
 558         if (streq(*username, "root") || streq(*username, "0")) {
 559                 *username = "root";
 560                 *uid = 0;
 561                 *gid = 0;
 562                 *home = "/root";
 563                 return 0;
 564         }
 565
 566         if (safe_atolu(*username, &lu) >= 0) {
 567                 errno = 0;
 568                 p = getpwuid((uid_t) lu);
 569
 570                 /* If there are multiple users with the same id, make
 571                  * sure to leave $USER to the configured value instead
 572                  * of the first occurence in the database. However if
 573                  * the uid was configured by a numeric uid, then let's
 574                  * pick the real username from /etc/passwd. */
 575                 if (*username && p)
 576                         *username = p->pw_name;
 577         } else {
 578                 errno = 0;
 579                 p = getpwnam(*username);
 580         }
 581
 582         if (!p)
 583                 return errno != 0 ? -errno : -ESRCH;
 584
 585         *uid = p->pw_uid;
 586         *gid = p->pw_gid;
 587         *home = p->pw_dir;
 588         return 0;
 589 }
 590
 591 static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
 592         bool keep_groups = false;
 593         int r;
 594
 595         assert(context);
 596
 597         /* Lookup and ser GID and supplementary group list. Here too
 598          * we avoid NSS lookups for gid=0. */
 599
 600         if (context->group || username) {
 601
 602                 if (context->group)
 603                         if ((r = get_group_creds(context->group, &gid)) < 0)
 604                                 return r;
 605
 606                 /* First step, initialize groups from /etc/groups */
 607                 if (username && gid != 0) {
 608                         if (initgroups(username, gid) < 0)
 609                                 return -errno;
 610
 611                         keep_groups = true;
 612                 }
 613
 614                 /* Second step, set our gids */
 615                 if (setresgid(gid, gid, gid) < 0)
 616                         return -errno;
 617         }
 618
 619         if (context->supplementary_groups) {
 620                 int ngroups_max, k;
 621                 gid_t *gids;
 622                 char **i;
 623
 624                 /* Final step, initialize any manually set supplementary groups */
 625                 ngroups_max = (int) sysconf(_SC_NGROUPS_MAX);
 626
 627                 if (!(gids = new(gid_t, ngroups_max)))
 628                         return -ENOMEM;
 629
 630                 if (keep_groups) {
 631                         if ((k = getgroups(ngroups_max, gids)) < 0) {
 632                                 free(gids);
 633                                 return -errno;
 634                         }
 635                 } else
 636                         k = 0;
 637
 638                 STRV_FOREACH(i, context->supplementary_groups) {
 639
 640                         if (k >= ngroups_max) {
 641                                 free(gids);
 642                                 return -E2BIG;
 643                         }
 644
 645                         if ((r = get_group_creds(*i, gids+k)) < 0) {
 646                                 free(gids);
 647                                 return r;
 648                         }
 649
 650                         k++;
 651                 }
 652
 653                 if (setgroups(k, gids) < 0) {
 654                         free(gids);
 655                         return -errno;
 656                 }
 657
 658                 free(gids);
 659         }
 660
 661         return 0;
 662 }
 663
 664 static int enforce_user(const ExecContext *context, uid_t uid) {
 665         int r;
 666         assert(context);
 667
 668         /* Sets (but doesn't lookup) the uid and make sure we keep the
 669          * capabilities while doing so. */
 670
 671         if (context->capabilities) {
 672                 cap_t d;
 673                 static const cap_value_t bits[] = {
 674                         CAP_SETUID,   /* Necessary so that we can run setresuid() below */
 675                         CAP_SETPCAP   /* Necessary so that we can set PR_SET_SECUREBITS later on */
 676                 };
 677
 678                 /* First step: If we need to keep capabilities but
 679                  * drop privileges we need to make sure we keep our
 680                  * caps, whiel we drop priviliges. */
 681                 if (uid != 0) {
 682                         int sb = context->secure_bits|SECURE_KEEP_CAPS;
 683
 684                         if (prctl(PR_GET_SECUREBITS) != sb)
 685                                 if (prctl(PR_SET_SECUREBITS, sb) < 0)
 686                                         return -errno;
 687                 }
 688
 689                 /* Second step: set the capabilites. This will reduce
 690                  * the capabilities to the minimum we need. */
 691
 692                 if (!(d = cap_dup(context->capabilities)))
 693                         return -errno;
 694
 695                 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
 696                     cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
 697                         r = -errno;
 698                         cap_free(d);
 699                         return r;
 700                 }
 701
 702                 if (cap_set_proc(d) < 0) {
 703                         r = -errno;
 704                         cap_free(d);
 705                         return r;
 706                 }
 707
 708                 cap_free(d);
 709         }
 710
 711         /* Third step: actually set the uids */
 712         if (setresuid(uid, uid, uid) < 0)
 713                 return -errno;
 714
 715         /* At this point we should have all necessary capabilities but
 716            are otherwise a normal user. However, the caps might got
 717            corrupted due to the setresuid() so we need clean them up
 718            later. This is done outside of this call. */
 719
 720         return 0;
 721 }
 722
 723 int exec_spawn(ExecCommand *command,
 724                char **argv,
 725                const ExecContext *context,
 726                int fds[], unsigned n_fds,
 727                char **environment,
 728                bool apply_permissions,
 729                bool apply_chroot,
 730                bool confirm_spawn,
 731                CGroupBonding *cgroup_bondings,
 732                pid_t *ret) {
 733
 734         pid_t pid;
 735         int r;
 736         char *line;
 737         int socket_fd;
 738
 739         assert(command);
 740         assert(context);
 741         assert(ret);
 742         assert(fds || n_fds <= 0);
 743
 744         if (context->std_input == EXEC_INPUT_SOCKET ||
 745             context->std_output == EXEC_OUTPUT_SOCKET ||
 746             context->std_error == EXEC_OUTPUT_SOCKET) {
 747
 748                 if (n_fds != 1)
 749                         return -EINVAL;
 750
 751                 socket_fd = fds[0];
 752
 753                 fds = NULL;
 754                 n_fds = 0;
 755         } else
 756                 socket_fd = -1;
 757
 758         if (!argv)
 759                 argv = command->argv;
 760
 761         if (!(line = exec_command_line(argv)))
 762                 return -ENOMEM;
 763
 764         log_debug("About to execute: %s", line);
 765         free(line);
 766
 767         if (cgroup_bondings)
 768                 if ((r = cgroup_bonding_realize_list(cgroup_bondings)))
 769                         return r;
 770
 771         if ((pid = fork()) < 0)
 772                 return -errno;
 773
 774         if (pid == 0) {
 775                 int i;
 776                 sigset_t ss;
 777                 const char *username = NULL, *home = NULL;
 778                 uid_t uid = (uid_t) -1;
 779                 gid_t gid = (gid_t) -1;
 780                 char **our_env = NULL, **final_env = NULL;
 781                 unsigned n_env = 0;
 782                 int saved_stdout = -1, saved_stdin = -1;
 783                 bool keep_stdout = false, keep_stdin = false;
 784
 785                 /* child */
 786
 787                 /* We reset exactly these signals, since they are the
 788                  * only ones we set to SIG_IGN in the main daemon. All
 789                  * others we leave untouched because we set them to
 790                  * SIG_DFL or a valid handler initially, both of which
 791                  * will be demoted to SIG_DFL. */
 792                 default_signals(SIGNALS_CRASH_HANDLER,
 793                                 SIGNALS_IGNORE, -1);
 794
 795                 if (sigemptyset(&ss) < 0 ||
 796                     sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
 797                         r = EXIT_SIGNAL_MASK;
 798                         goto fail;
 799                 }
 800
 801                 if (!context->no_setsid)
 802                         if (setsid() < 0) {
 803                                 r = EXIT_SETSID;
 804                                 goto fail;
 805                         }
 806
 807                 if (socket_fd >= 0 && context->tcpwrap_name)
 808                         if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
 809                                 r = EXIT_TCPWRAP;
 810                                 goto fail;
 811                         }
 812
 813                 if (confirm_spawn) {
 814                         char response;
 815
 816                         /* Set up terminal for the question */
 817                         if ((r = setup_confirm_stdio(context,
 818                                                      &saved_stdin, &saved_stdout)))
 819                                 goto fail;
 820
 821                         /* Now ask the question. */
 822                         if (!(line = exec_command_line(argv))) {
 823                                 r = EXIT_MEMORY;
 824                                 goto fail;
 825                         }
 826
 827                         r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line);
 828                         free(line);
 829
 830                         if (r < 0 || response == 'n') {
 831                                 r = EXIT_CONFIRM;
 832                                 goto fail;
 833                         } else if (response == 's') {
 834                                 r = 0;
 835                                 goto fail;
 836                         }
 837
 838                         /* Release terminal for the question */
 839                         if ((r = restore_confirm_stdio(context,
 840                                                        &saved_stdin, &saved_stdout,
 841                                                        &keep_stdin, &keep_stdout)))
 842                                 goto fail;
 843                 }
 844
 845                 if (!keep_stdin)
 846                         if (setup_input(context, socket_fd) < 0) {
 847                                 r = EXIT_STDIN;
 848                                 goto fail;
 849                         }
 850
 851                 if (!keep_stdout)
 852                         if (setup_output(context, socket_fd, file_name_from_path(command->path)) < 0) {
 853                                 r = EXIT_STDOUT;
 854                                 goto fail;
 855                         }
 856
 857                 if (setup_error(context, socket_fd, file_name_from_path(command->path)) < 0) {
 858                         r = EXIT_STDERR;
 859                         goto fail;
 860                 }
 861
 862                 if (cgroup_bondings)
 863                         if ((r = cgroup_bonding_install_list(cgroup_bondings, 0)) < 0) {
 864                                 r = EXIT_CGROUP;
 865                                 goto fail;
 866                         }
 867
 868                 if (context->oom_adjust_set) {
 869                         char t[16];
 870
 871                         snprintf(t, sizeof(t), "%i", context->oom_adjust);
 872                         char_array_0(t);
 873
 874                         if (write_one_line_file("/proc/self/oom_adj", t) < 0) {
 875                                 r = EXIT_OOM_ADJUST;
 876                                 goto fail;
 877                         }
 878                 }
 879
 880                 if (context->nice_set)
 881                         if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
 882                                 r = EXIT_NICE;
 883                                 goto fail;
 884                         }
 885
 886                 if (context->cpu_sched_set) {
 887                         struct sched_param param;
 888
 889                         zero(param);
 890                         param.sched_priority = context->cpu_sched_priority;
 891
 892                         if (sched_setscheduler(0, context->cpu_sched_policy |
 893                                                (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
 894                                 r = EXIT_SETSCHEDULER;
 895                                 goto fail;
 896                         }
 897                 }
 898
 899                 if (context->cpu_affinity_set)
 900                         if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) {
 901                                 r = EXIT_CPUAFFINITY;
 902                                 goto fail;
 903                         }
 904
 905                 if (context->ioprio_set)
 906                         if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
 907                                 r = EXIT_IOPRIO;
 908                                 goto fail;
 909                         }
 910
 911                 if (context->timer_slack_ns_set)
 912                         if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) {
 913                                 r = EXIT_TIMERSLACK;
 914                                 goto fail;
 915                         }
 916
 917                 if (context->user) {
 918                         username = context->user;
 919                         if (get_user_creds(&username, &uid, &gid, &home) < 0) {
 920                                 r = EXIT_USER;
 921                                 goto fail;
 922                         }
 923
 924                         if (is_terminal_input(context->std_input))
 925                                 if (chown_terminal(STDIN_FILENO, uid) < 0) {
 926                                         r = EXIT_STDIN;
 927                                         goto fail;
 928                                 }
 929                 }
 930
 931                 if (apply_permissions)
 932                         if (enforce_groups(context, username, uid) < 0) {
 933                                 r = EXIT_GROUP;
 934                                 goto fail;
 935                         }
 936
 937                 umask(context->umask);
 938
 939                 if (strv_length(context->read_write_dirs) > 0 ||
 940                     strv_length(context->read_only_dirs) > 0 ||
 941                     strv_length(context->inaccessible_dirs) > 0 ||
 942                     context->mount_flags != MS_SHARED ||
 943                     context->private_tmp)
 944                         if ((r = setup_namespace(
 945                                              context->read_write_dirs,
 946                                              context->read_only_dirs,
 947                                              context->inaccessible_dirs,
 948                                              context->private_tmp,
 949                                              context->mount_flags)) < 0)
 950                                 goto fail;
 951
 952                 if (apply_chroot) {
 953                         if (context->root_directory)
 954                                 if (chroot(context->root_directory) < 0) {
 955                                         r = EXIT_CHROOT;
 956                                         goto fail;
 957                                 }
 958
 959                         if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
 960                                 r = EXIT_CHDIR;
 961                                 goto fail;
 962                         }
 963                 } else {
 964
 965                         char *d;
 966
 967                         if (asprintf(&d, "%s/%s",
 968                                      context->root_directory ? context->root_directory : "",
 969                                      context->working_directory ? context->working_directory : "") < 0) {
 970                                 r = EXIT_MEMORY;
 971                                 goto fail;
 972                         }
 973
 974                         if (chdir(d) < 0) {
 975                                 free(d);
 976                                 r = EXIT_CHDIR;
 977                                 goto fail;
 978                         }
 979
 980                         free(d);
 981                 }
 982
 983                 if (close_all_fds(fds, n_fds) < 0 ||
 984                     shift_fds(fds, n_fds) < 0 ||
 985                     flags_fds(fds, n_fds, context->non_blocking) < 0) {
 986                         r = EXIT_FDS;
 987                         goto fail;
 988                 }
 989
 990                 if (apply_permissions) {
 991
 992                         for (i = 0; i < RLIMIT_NLIMITS; i++) {
 993                                 if (!context->rlimit[i])
 994                                         continue;
 995
 996                                 if (setrlimit(i, context->rlimit[i]) < 0) {
 997                                         r = EXIT_LIMITS;
 998                                         goto fail;
 999                                 }
1000                         }
1001
1002                         if (context->user)
1003                                 if (enforce_user(context, uid) < 0) {
1004                                         r = EXIT_USER;
1005                                         goto fail;
1006                                 }
1007
1008                         /* PR_GET_SECUREBITS is not priviliged, while
1009                          * PR_SET_SECUREBITS is. So to suppress
1010                          * potential EPERMs we'll try not to call
1011                          * PR_SET_SECUREBITS unless necessary. */
1012                         if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1013                                 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1014                                         r = EXIT_SECUREBITS;
1015                                         goto fail;
1016                                 }
1017
1018                         if (context->capabilities)
1019                                 if (cap_set_proc(context->capabilities) < 0) {
1020                                         r = EXIT_CAPABILITIES;
1021                                         goto fail;
1022                                 }
1023                 }
1024
1025                 if (!(our_env = new0(char*, 6))) {
1026                         r = EXIT_MEMORY;
1027                         goto fail;
1028                 }
1029
1030                 if (n_fds > 0)
1031                         if (asprintf(our_env + n_env++, "LISTEN_PID=%llu", (unsigned long long) getpid()) < 0 ||
1032                             asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
1033                                 r = EXIT_MEMORY;
1034                                 goto fail;
1035                         }
1036
1037                 if (home)
1038                         if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
1039                                 r = EXIT_MEMORY;
1040                                 goto fail;
1041                         }
1042
1043                 if (username)
1044                         if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
1045                             asprintf(our_env + n_env++, "USER=%s", username) < 0) {
1046                                 r = EXIT_MEMORY;
1047                                 goto fail;
1048                         }
1049
1050                 assert(n_env <= 6);
1051
1052                 if (!(final_env = strv_env_merge(environment, our_env, context->environment, NULL))) {
1053                         r = EXIT_MEMORY;
1054                         goto fail;
1055                 }
1056
1057                 execve(command->path, argv, final_env);
1058                 r = EXIT_EXEC;
1059
1060         fail:
1061                 strv_free(our_env);
1062                 strv_free(final_env);
1063
1064                 if (saved_stdin >= 0)
1065                         close_nointr_nofail(saved_stdin);
1066
1067                 if (saved_stdout >= 0)
1068                         close_nointr_nofail(saved_stdout);
1069
1070                 _exit(r);
1071         }
1072
1073         /* We add the new process to the cgroup both in the child (so
1074          * that we can be sure that no user code is ever executed
1075          * outside of the cgroup) and in the parent (so that we can be
1076          * sure that when we kill the cgroup the process will be
1077          * killed too). */
1078         if (cgroup_bondings)
1079                 cgroup_bonding_install_list(cgroup_bondings, pid);
1080
1081         log_debug("Forked %s as %llu", command->path, (unsigned long long) pid);
1082
1083         command->exec_status.pid = pid;
1084         command->exec_status.start_timestamp = now(CLOCK_REALTIME);
1085
1086         *ret = pid;
1087         return 0;
1088 }
1089
1090 void exec_context_init(ExecContext *c) {
1091         assert(c);
1092
1093         c->umask = 0002;
1094         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
1095         c->cpu_sched_policy = SCHED_OTHER;
1096         c->syslog_priority = LOG_DAEMON|LOG_INFO;
1097         c->mount_flags = MS_SHARED;
1098 }
1099
1100 void exec_context_done(ExecContext *c) {
1101         unsigned l;
1102
1103         assert(c);
1104
1105         strv_free(c->environment);
1106         c->environment = NULL;
1107
1108         for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
1109                 free(c->rlimit[l]);
1110                 c->rlimit[l] = NULL;
1111         }
1112
1113         free(c->working_directory);
1114         c->working_directory = NULL;
1115         free(c->root_directory);
1116         c->root_directory = NULL;
1117
1118         free(c->tty_path);
1119         c->tty_path = NULL;
1120
1121         free(c->tcpwrap_name);
1122         c->tcpwrap_name = NULL;
1123
1124         free(c->syslog_identifier);
1125         c->syslog_identifier = NULL;
1126
1127         free(c->user);
1128         c->user = NULL;
1129
1130         free(c->group);
1131         c->group = NULL;
1132
1133         strv_free(c->supplementary_groups);
1134         c->supplementary_groups = NULL;
1135
1136         if (c->capabilities) {
1137                 cap_free(c->capabilities);
1138                 c->capabilities = NULL;
1139         }
1140
1141         strv_free(c->read_only_dirs);
1142         c->read_only_dirs = NULL;
1143
1144         strv_free(c->read_write_dirs);
1145         c->read_write_dirs = NULL;
1146
1147         strv_free(c->inaccessible_dirs);
1148         c->inaccessible_dirs = NULL;
1149 }
1150
1151 void exec_command_done(ExecCommand *c) {
1152         assert(c);
1153
1154         free(c->path);
1155         c->path = NULL;
1156
1157         strv_free(c->argv);
1158         c->argv = NULL;
1159 }
1160
1161 void exec_command_done_array(ExecCommand *c, unsigned n) {
1162         unsigned i;
1163
1164         for (i = 0; i < n; i++)
1165                 exec_command_done(c+i);
1166 }
1167
1168 void exec_command_free_list(ExecCommand *c) {
1169         ExecCommand *i;
1170
1171         while ((i = c)) {
1172                 LIST_REMOVE(ExecCommand, command, c, i);
1173                 exec_command_done(i);
1174                 free(i);
1175         }
1176 }
1177
1178 void exec_command_free_array(ExecCommand **c, unsigned n) {
1179         unsigned i;
1180
1181         for (i = 0; i < n; i++) {
1182                 exec_command_free_list(c[i]);
1183                 c[i] = NULL;
1184         }
1185 }
1186
1187 static void strv_fprintf(FILE *f, char **l) {
1188         char **g;
1189
1190         assert(f);
1191
1192         STRV_FOREACH(g, l)
1193                 fprintf(f, " %s", *g);
1194 }
1195
1196 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
1197         char ** e;
1198         unsigned i;
1199
1200         assert(c);
1201         assert(f);
1202
1203         if (!prefix)
1204                 prefix = "";
1205
1206         fprintf(f,
1207                 "%sUMask: %04o\n"
1208                 "%sWorkingDirectory: %s\n"
1209                 "%sRootDirectory: %s\n"
1210                 "%sNonBlocking: %s\n"
1211                 "%sPrivateTmp: %s\n",
1212                 prefix, c->umask,
1213                 prefix, c->working_directory ? c->working_directory : "/",
1214                 prefix, c->root_directory ? c->root_directory : "/",
1215                 prefix, yes_no(c->non_blocking),
1216                 prefix, yes_no(c->private_tmp));
1217
1218         if (c->environment)
1219                 for (e = c->environment; *e; e++)
1220                         fprintf(f, "%sEnvironment: %s\n", prefix, *e);
1221
1222         if (c->tcpwrap_name)
1223                 fprintf(f,
1224                         "%sTCPWrapName: %s\n",
1225                         prefix, c->tcpwrap_name);
1226
1227         if (c->nice_set)
1228                 fprintf(f,
1229                         "%sNice: %i\n",
1230                         prefix, c->nice);
1231
1232         if (c->oom_adjust_set)
1233                 fprintf(f,
1234                         "%sOOMAdjust: %i\n",
1235                         prefix, c->oom_adjust);
1236
1237         for (i = 0; i < RLIM_NLIMITS; i++)
1238                 if (c->rlimit[i])
1239                         fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
1240
1241         if (c->ioprio_set)
1242                 fprintf(f,
1243                         "%sIOSchedulingClass: %s\n"
1244                         "%sIOPriority: %i\n",
1245                         prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
1246                         prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
1247
1248         if (c->cpu_sched_set)
1249                 fprintf(f,
1250                         "%sCPUSchedulingPolicy: %s\n"
1251                         "%sCPUSchedulingPriority: %i\n"
1252                         "%sCPUSchedulingResetOnFork: %s\n",
1253                         prefix, sched_policy_to_string(c->cpu_sched_policy),
1254                         prefix, c->cpu_sched_priority,
1255                         prefix, yes_no(c->cpu_sched_reset_on_fork));
1256
1257         if (c->cpu_affinity_set) {
1258                 fprintf(f, "%sCPUAffinity:", prefix);
1259                 for (i = 0; i < CPU_SETSIZE; i++)
1260                         if (CPU_ISSET(i, &c->cpu_affinity))
1261                                 fprintf(f, " %i", i);
1262                 fputs("\n", f);
1263         }
1264
1265         if (c->timer_slack_ns_set)
1266                 fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns);
1267
1268         fprintf(f,
1269                 "%sStandardInput: %s\n"
1270                 "%sStandardOutput: %s\n"
1271                 "%sStandardError: %s\n",
1272                 prefix, exec_input_to_string(c->std_input),
1273                 prefix, exec_output_to_string(c->std_output),
1274                 prefix, exec_output_to_string(c->std_error));
1275
1276         if (c->tty_path)
1277                 fprintf(f,
1278                         "%sTTYPath: %s\n",
1279                         prefix, c->tty_path);
1280
1281         if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG ||
1282             c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG)
1283                 fprintf(f,
1284                         "%sSyslogFacility: %s\n"
1285                         "%sSyslogLevel: %s\n",
1286                         prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)),
1287                         prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
1288
1289         if (c->capabilities) {
1290                 char *t;
1291                 if ((t = cap_to_text(c->capabilities, NULL))) {
1292                         fprintf(f, "%sCapabilities: %s\n",
1293                                 prefix, t);
1294                         cap_free(t);
1295                 }
1296         }
1297
1298         if (c->secure_bits)
1299                 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
1300                         prefix,
1301                         (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
1302                         (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
1303                         (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
1304                         (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
1305                         (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
1306                         (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
1307
1308         if (c->capability_bounding_set_drop) {
1309                 fprintf(f, "%sCapabilityBoundingSetDrop:", prefix);
1310
1311                 for (i = 0; i <= CAP_LAST_CAP; i++)
1312                         if (c->capability_bounding_set_drop & (1 << i)) {
1313                                 char *t;
1314
1315                                 if ((t = cap_to_name(i))) {
1316                                         fprintf(f, " %s", t);
1317                                         free(t);
1318                                 }
1319                         }
1320
1321                 fputs("\n", f);
1322         }
1323
1324         if (c->user)
1325                 fprintf(f, "%sUser: %s", prefix, c->user);
1326         if (c->group)
1327                 fprintf(f, "%sGroup: %s", prefix, c->group);
1328
1329         if (strv_length(c->supplementary_groups) > 0) {
1330                 fprintf(f, "%sSupplementaryGroups:", prefix);
1331                 strv_fprintf(f, c->supplementary_groups);
1332                 fputs("\n", f);
1333         }
1334
1335         if (strv_length(c->read_write_dirs) > 0) {
1336                 fprintf(f, "%sReadWriteDirs:", prefix);
1337                 strv_fprintf(f, c->read_write_dirs);
1338                 fputs("\n", f);
1339         }
1340
1341         if (strv_length(c->read_only_dirs) > 0) {
1342                 fprintf(f, "%sReadOnlyDirs:", prefix);
1343                 strv_fprintf(f, c->read_only_dirs);
1344                 fputs("\n", f);
1345         }
1346
1347         if (strv_length(c->inaccessible_dirs) > 0) {
1348                 fprintf(f, "%sInaccessibleDirs:", prefix);
1349                 strv_fprintf(f, c->inaccessible_dirs);
1350                 fputs("\n", f);
1351         }
1352 }
1353
1354 void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) {
1355         assert(s);
1356
1357         s->pid = pid;
1358         s->exit_timestamp = now(CLOCK_REALTIME);
1359
1360         s->code = code;
1361         s->status = status;
1362 }
1363
1364 void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
1365         char buf[FORMAT_TIMESTAMP_MAX];
1366
1367         assert(s);
1368         assert(f);
1369
1370         if (!prefix)
1371                 prefix = "";
1372
1373         if (s->pid <= 0)
1374                 return;
1375
1376         fprintf(f,
1377                 "%sPID: %llu\n",
1378                 prefix, (unsigned long long) s->pid);
1379
1380         if (s->start_timestamp > 0)
1381                 fprintf(f,
1382                         "%sStart Timestamp: %s\n",
1383                         prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp));
1384
1385         if (s->exit_timestamp > 0)
1386                 fprintf(f,
1387                         "%sExit Timestamp: %s\n"
1388                         "%sExit Code: %s\n"
1389                         "%sExit Status: %i\n",
1390                         prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp),
1391                         prefix, sigchld_code_to_string(s->code),
1392                         prefix, s->status);
1393 }
1394
1395 char *exec_command_line(char **argv) {
1396         size_t k;
1397         char *n, *p, **a;
1398         bool first = true;
1399
1400         assert(argv);
1401
1402         k = 1;
1403         STRV_FOREACH(a, argv)
1404                 k += strlen(*a)+3;
1405
1406         if (!(n = new(char, k)))
1407                 return NULL;
1408
1409         p = n;
1410         STRV_FOREACH(a, argv) {
1411
1412                 if (!first)
1413                         *(p++) = ' ';
1414                 else
1415                         first = false;
1416
1417                 if (strpbrk(*a, WHITESPACE)) {
1418                         *(p++) = '\'';
1419                         p = stpcpy(p, *a);
1420                         *(p++) = '\'';
1421                 } else
1422                         p = stpcpy(p, *a);
1423
1424         }
1425
1426         *p = 0;
1427
1428         /* FIXME: this doesn't really handle arguments that have
1429          * spaces and ticks in them */
1430
1431         return n;
1432 }
1433
1434 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
1435         char *p2;
1436         const char *prefix2;
1437
1438         char *cmd;
1439
1440         assert(c);
1441         assert(f);
1442
1443         if (!prefix)
1444                 prefix = "";
1445         p2 = strappend(prefix, "\t");
1446         prefix2 = p2 ? p2 : prefix;
1447
1448         cmd = exec_command_line(c->argv);
1449
1450         fprintf(f,
1451                 "%sCommand Line: %s\n",
1452                 prefix, cmd ? cmd : strerror(ENOMEM));
1453
1454         free(cmd);
1455
1456         exec_status_dump(&c->exec_status, f, prefix2);
1457
1458         free(p2);
1459 }
1460
1461 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
1462         assert(f);
1463
1464         if (!prefix)
1465                 prefix = "";
1466
1467         LIST_FOREACH(command, c, c)
1468                 exec_command_dump(c, f, prefix);
1469 }
1470
1471 void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
1472         ExecCommand *end;
1473
1474         assert(l);
1475         assert(e);
1476
1477         if (*l) {
1478                 /* It's kinda important that we keep the order here */
1479                 LIST_FIND_TAIL(ExecCommand, command, *l, end);
1480                 LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
1481         } else
1482               *l = e;
1483 }
1484
1485 int exec_command_set(ExecCommand *c, const char *path, ...) {
1486         va_list ap;
1487         char **l, *p;
1488
1489         assert(c);
1490         assert(path);
1491
1492         va_start(ap, path);
1493         l = strv_new_ap(path, ap);
1494         va_end(ap);
1495
1496         if (!l)
1497                 return -ENOMEM;
1498
1499         if (!(p = strdup(path))) {
1500                 strv_free(l);
1501                 return -ENOMEM;
1502         }
1503
1504         free(c->path);
1505         c->path = p;
1506
1507         strv_free(c->argv);
1508         c->argv = l;
1509
1510         return 0;
1511 }
1512
1513 const char* exit_status_to_string(ExitStatus status) {
1514
1515         /* We cast to int here, so that -Wenum doesn't complain that
1516          * EXIT_SUCCESS/EXIT_FAILURE aren't in the enum */
1517
1518         switch ((int) status) {
1519
1520         case EXIT_SUCCESS:
1521                 return "SUCCESS";
1522
1523         case EXIT_FAILURE:
1524                 return "FAILURE";
1525
1526         case EXIT_INVALIDARGUMENT:
1527                 return "INVALIDARGUMENT";
1528
1529         case EXIT_NOTIMPLEMENTED:
1530                 return "NOTIMPLEMENTED";
1531
1532         case EXIT_NOPERMISSION:
1533                 return "NOPERMISSION";
1534
1535         case EXIT_NOTINSTALLED:
1536                 return "NOTINSSTALLED";
1537
1538         case EXIT_NOTCONFIGURED:
1539                 return "NOTCONFIGURED";
1540
1541         case EXIT_NOTRUNNING:
1542                 return "NOTRUNNING";
1543
1544         case EXIT_CHDIR:
1545                 return "CHDIR";
1546
1547         case EXIT_NICE:
1548                 return "NICE";
1549
1550         case EXIT_FDS:
1551                 return "FDS";
1552
1553         case EXIT_EXEC:
1554                 return "EXEC";
1555
1556         case EXIT_MEMORY:
1557                 return "MEMORY";
1558
1559         case EXIT_LIMITS:
1560                 return "LIMITS";
1561
1562         case EXIT_OOM_ADJUST:
1563                 return "OOM_ADJUST";
1564
1565         case EXIT_SIGNAL_MASK:
1566                 return "SIGNAL_MASK";
1567
1568         case EXIT_STDIN:
1569                 return "STDIN";
1570
1571         case EXIT_STDOUT:
1572                 return "STDOUT";
1573
1574         case EXIT_CHROOT:
1575                 return "CHROOT";
1576
1577         case EXIT_IOPRIO:
1578                 return "IOPRIO";
1579
1580         case EXIT_TIMERSLACK:
1581                 return "TIMERSLACK";
1582
1583         case EXIT_SECUREBITS:
1584                 return "SECUREBITS";
1585
1586         case EXIT_SETSCHEDULER:
1587                 return "SETSCHEDULER";
1588
1589         case EXIT_CPUAFFINITY:
1590                 return "CPUAFFINITY";
1591
1592         case EXIT_GROUP:
1593                 return "GROUP";
1594
1595         case EXIT_USER:
1596                 return "USER";
1597
1598         case EXIT_CAPABILITIES:
1599                 return "CAPABILITIES";
1600
1601         case EXIT_CGROUP:
1602                 return "CGROUP";
1603
1604         case EXIT_SETSID:
1605                 return "SETSID";
1606
1607         case EXIT_CONFIRM:
1608                 return "CONFIRM";
1609
1610         case EXIT_STDERR:
1611                 return "STDERR";
1612
1613         case EXIT_TCPWRAP:
1614                 return "TCPWRAP";
1615
1616         default:
1617                 return NULL;
1618         }
1619 }
1620
1621 static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
1622         [EXEC_INPUT_NULL] = "null",
1623         [EXEC_INPUT_TTY] = "tty",
1624         [EXEC_INPUT_TTY_FORCE] = "tty-force",
1625         [EXEC_INPUT_TTY_FAIL] = "tty-fail",
1626         [EXEC_INPUT_SOCKET] = "socket"
1627 };
1628
1629 static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
1630         [EXEC_OUTPUT_INHERIT] = "inherit",
1631         [EXEC_OUTPUT_NULL] = "null",
1632         [EXEC_OUTPUT_TTY] = "tty",
1633         [EXEC_OUTPUT_SYSLOG] = "syslog",
1634         [EXEC_OUTPUT_KMSG] = "kmsg",
1635         [EXEC_OUTPUT_SOCKET] = "socket"
1636 };
1637
1638 DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
1639
1640 DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);