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d6c9574f 1/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
5cb5a6ff 2
a7334b09
LP		 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
5cb5a6ff 22#include <assert.h>
034c6ed7
LP		 23#include <dirent.h>
24#include <errno.h>
25#include <fcntl.h>
26#include <unistd.h>
44d8db9e 27#include <string.h>
309bff19 28#include <signal.h>
071830ff
LP		 29#include <sys/socket.h>
30#include <sys/un.h>
94f04347 31#include <sys/prctl.h>
66ee3769 32#include <linux/sched.h>
451a074f
LP		 33#include <sys/types.h>
34#include <sys/stat.h>
81a2b7ce
LP		 35#include <grp.h>
36#include <pwd.h>
15ae422b 37#include <sys/mount.h>
25e870b5 38#include <linux/fs.h>
dd6c17b1 39#include <linux/oom.h>
5cb5a6ff 40
5b6319dc
LP		 41#ifdef HAVE_PAM
42#include <security/pam_appl.h>
43#endif
44
5cb5a6ff
LP		 45#include "execute.h"
46#include "strv.h"
47#include "macro.h"
48#include "util.h"
acbb0225 49#include "log.h"
9eba9da4 50#include "ioprio.h"
94f04347 51#include "securebits.h"
8e274523 52#include "cgroup.h"
15ae422b 53#include "namespace.h"
df1f0afe 54#include "tcpwrap.h"
d06dacd0 55#include "exit-status.h"
dd6c17b1 56#include "missing.h"
169c1bda 57#include "utmp-wtmp.h"
f6a6225e 58#include "def.h"
5cb5a6ff 59
02a51aba
LP		 60/* This assumes there is a 'tty' group */
61#define TTY_MODE 0620
62
034c6ed7
LP		 63static int shift_fds(int fds[], unsigned n_fds) {
64 int start, restart_from;
65
66 if (n_fds <= 0)
67 return 0;
68
a0d40ac5
LP		 69 /* Modifies the fds array! (sorts it) */
70
034c6ed7
LP		 71 assert(fds);
72
73 start = 0;
74 for (;;) {
75 int i;
76
77 restart_from = -1;
78
79 for (i = start; i < (int) n_fds; i++) {
80 int nfd;
81
82 /* Already at right index? */
83 if (fds[i] == i+3)
84 continue;
85
86 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
87 return -errno;
88
e1f5e051 89 close_nointr_nofail(fds[i]);
034c6ed7
LP		 90 fds[i] = nfd;
91
92 /* Hmm, the fd we wanted isn't free? Then
93 * let's remember that and try again from here*/
94 if (nfd != i+3 && restart_from < 0)
95 restart_from = i;
96 }
97
98 if (restart_from < 0)
99 break;
100
101 start = restart_from;
102 }
103
104 return 0;
105}
106
c2748801 107static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
47a71eed 108 unsigned i;
e2c76839 109 int r;
47a71eed
LP		 110
111 if (n_fds <= 0)
112 return 0;
113
114 assert(fds);
115
451a074f 116 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
47a71eed
LP		 117
118 for (i = 0; i < n_fds; i++) {
47a71eed 119
e2c76839
LP		 120 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
121 return r;
47a71eed 122
451a074f
LP		 123 /* We unconditionally drop FD_CLOEXEC from the fds,
124 * since after all we want to pass these fds to our
125 * children */
47a71eed 126
e2c76839
LP		 127 if ((r = fd_cloexec(fds[i], false)) < 0)
128 return r;
47a71eed
LP		 129 }
130
131 return 0;
132}
133
80876c20
LP		 134static const char *tty_path(const ExecContext *context) {
135 assert(context);
136
137 if (context->tty_path)
138 return context->tty_path;
139
140 return "/dev/console";
141}
142
6ea832a2
LP		 143void exec_context_tty_reset(const ExecContext *context) {
144 assert(context);
145
146 if (context->tty_vhangup)
147 terminal_vhangup(tty_path(context));
148
149 if (context->tty_reset)
150 reset_terminal(tty_path(context));
151
152 if (context->tty_vt_disallocate && context->tty_path)
153 vt_disallocate(context->tty_path);
154}
155
80876c20
LP		 156static int open_null_as(int flags, int nfd) {
157 int fd, r;
071830ff 158
80876c20 159 assert(nfd >= 0);
071830ff 160
80876c20 161 if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
071830ff
LP		 162 return -errno;
163
80876c20
LP		 164 if (fd != nfd) {
165 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 166 close_nointr_nofail(fd);
80876c20
LP		 167 } else
168 r = nfd;
071830ff 169
80876c20 170 return r;
071830ff
LP		 171}
172
80876c20
LP		 173static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) {
174 int fd, r;
175 union {
176 struct sockaddr sa;
177 struct sockaddr_un un;
178 } sa;
071830ff
LP		 179
180 assert(context);
80876c20
LP		 181 assert(output < _EXEC_OUTPUT_MAX);
182 assert(ident);
183 assert(nfd >= 0);
071830ff 184
80876c20
LP		 185 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
186 return -errno;
071830ff 187
80876c20
LP		 188 zero(sa);
189 sa.sa.sa_family = AF_UNIX;
91b22f21 190 strncpy(sa.un.sun_path, LOGGER_SOCKET, sizeof(sa.un.sun_path));
071830ff 191
91b22f21 192 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + sizeof(LOGGER_SOCKET) - 1) < 0) {
80876c20
LP		 193 close_nointr_nofail(fd);
194 return -errno;
195 }
071830ff 196
80876c20
LP		 197 if (shutdown(fd, SHUT_RD) < 0) {
198 close_nointr_nofail(fd);
199 return -errno;
200 }
071830ff 201
80876c20
LP		 202 /* We speak a very simple protocol between log server
203 * and client: one line for the log destination (kmsg
204 * or syslog), followed by the priority field,
205 * followed by the process name. Since we replaced
206 * stdin/stderr we simple use stdio to write to
207 * it. Note that we use stderr, to minimize buffer
208 * flushing issues. */
209
210 dprintf(fd,
211 "%s\n"
212 "%i\n"
4f4a1dbf
LP		 213 "%s\n"
214 "%i\n",
28dbc1e8
LP		 215 output == EXEC_OUTPUT_KMSG ? "kmsg" :
216 output == EXEC_OUTPUT_KMSG_AND_CONSOLE ? "kmsg+console" :
217 output == EXEC_OUTPUT_SYSLOG ? "syslog" :
218 "syslog+console",
80876c20 219 context->syslog_priority,
4f4a1dbf 220 context->syslog_identifier ? context->syslog_identifier : ident,
74922904 221 context->syslog_level_prefix);
80876c20
LP		 222
223 if (fd != nfd) {
224 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 225 close_nointr_nofail(fd);
80876c20
LP		 226 } else
227 r = nfd;
071830ff 228
80876c20
LP		 229 return r;
230}
231static int open_terminal_as(const char *path, mode_t mode, int nfd) {
232 int fd, r;
071830ff 233
80876c20
LP		 234 assert(path);
235 assert(nfd >= 0);
071830ff 236
80876c20
LP		 237 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
238 return fd;
071830ff 239
80876c20
LP		 240 if (fd != nfd) {
241 r = dup2(fd, nfd) < 0 ? -errno : nfd;
242 close_nointr_nofail(fd);
243 } else
244 r = nfd;
071830ff 245
80876c20
LP		 246 return r;
247}
071830ff 248
80876c20
LP		 249static bool is_terminal_input(ExecInput i) {
250 return
251 i == EXEC_INPUT_TTY ||
252 i == EXEC_INPUT_TTY_FORCE ||
253 i == EXEC_INPUT_TTY_FAIL;
254}
071830ff 255
1e3ad081
LP		 256static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
257
258 if (is_terminal_input(std_input) && !apply_tty_stdin)
259 return EXEC_INPUT_NULL;
071830ff 260
03fd9c49 261 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 262 return EXEC_INPUT_NULL;
263
03fd9c49 264 return std_input;
4f2d528d
LP		 265}
266
03fd9c49 267static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 268
03fd9c49 269 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 270 return EXEC_OUTPUT_INHERIT;
271
03fd9c49 272 return std_output;
4f2d528d
LP		 273}
274
1e3ad081 275static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
4f2d528d
LP		 276 ExecInput i;
277
278 assert(context);
279
1e3ad081 280 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
4f2d528d
LP		 281
282 switch (i) {
071830ff 283
80876c20
LP		 284 case EXEC_INPUT_NULL:
285 return open_null_as(O_RDONLY, STDIN_FILENO);
286
287 case EXEC_INPUT_TTY:
288 case EXEC_INPUT_TTY_FORCE:
289 case EXEC_INPUT_TTY_FAIL: {
290 int fd, r;
071830ff 291
80876c20
LP		 292 if ((fd = acquire_terminal(
293 tty_path(context),
4f2d528d 294 i == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 295 i == EXEC_INPUT_TTY_FORCE,
296 false)) < 0)
80876c20
LP		 297 return fd;
298
299 if (fd != STDIN_FILENO) {
300 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
071830ff 301 close_nointr_nofail(fd);
80876c20
LP		 302 } else
303 r = STDIN_FILENO;
304
305 return r;
306 }
307
4f2d528d
LP		 308 case EXEC_INPUT_SOCKET:
309 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
310
80876c20
LP		 311 default:
312 assert_not_reached("Unknown input type");
313 }
314}
315
1e3ad081 316static int setup_output(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
4f2d528d
LP		 317 ExecOutput o;
318 ExecInput i;
319
80876c20
LP		 320 assert(context);
321 assert(ident);
322
1e3ad081 323 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49 324 o = fixup_output(context->std_output, socket_fd);
4f2d528d 325
80876c20
LP		 326 /* This expects the input is already set up */
327
4f2d528d 328 switch (o) {
071830ff 329
80876c20
LP		 330 case EXEC_OUTPUT_INHERIT:
331
21d21ea4
LP		 332 /* If input got downgraded, inherit the original value */
333 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
334 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
335
acb591e4 336 /* If the input is connected to anything that's not a /dev/null, inherit that... */
ff876e28 337 if (i != EXEC_INPUT_NULL)
80876c20 338 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
071830ff 339
acb591e4
LP		 340 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
341 if (getppid() != 1)
342 return STDOUT_FILENO;
ff876e28 343
acb591e4
LP		 344 /* We need to open /dev/null here anew, to get the
345 * right access mode. So we fall through */
80876c20
LP		 346
347 case EXEC_OUTPUT_NULL:
348 return open_null_as(O_WRONLY, STDOUT_FILENO);
349
4f2d528d
LP		 350 case EXEC_OUTPUT_TTY:
351 if (is_terminal_input(i))
80876c20
LP		 352 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
353
354 /* We don't reset the terminal if this is just about output */
355 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
94f04347 356
80876c20 357 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 358 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 359 case EXEC_OUTPUT_KMSG:
28dbc1e8 360 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
4f2d528d
LP		 361 return connect_logger_as(context, o, ident, STDOUT_FILENO);
362
363 case EXEC_OUTPUT_SOCKET:
364 assert(socket_fd >= 0);
365 return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
80876c20 366
94f04347
LP		 367 default:
368 assert_not_reached("Unknown output type");
071830ff 369 }
94f04347
LP		 370}
371
1e3ad081 372static int setup_error(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
4f2d528d
LP		 373 ExecOutput o, e;
374 ExecInput i;
375
94f04347 376 assert(context);
02a51aba 377 assert(ident);
071830ff 378
1e3ad081 379 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49
LP		 380 o = fixup_output(context->std_output, socket_fd);
381 e = fixup_output(context->std_error, socket_fd);
4f2d528d 382
80876c20 383 /* This expects the input and output are already set up */
94f04347 384
80876c20
LP		 385 /* Don't change the stderr file descriptor if we inherit all
386 * the way and are not on a tty */
4f2d528d
LP		 387 if (e == EXEC_OUTPUT_INHERIT &&
388 o == EXEC_OUTPUT_INHERIT &&
acb591e4 389 i == EXEC_INPUT_NULL &&
21d21ea4 390 !is_terminal_input(context->std_input) &&
dec5d552 391 getppid () != 1)
80876c20 392 return STDERR_FILENO;
94f04347 393
21d21ea4 394 /* Duplicate from stdout if possible */
4f2d528d 395 if (e == o || e == EXEC_OUTPUT_INHERIT)
80876c20 396 return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347 397
4f2d528d 398 switch (e) {
80876c20
LP		 399
400 case EXEC_OUTPUT_NULL:
401 return open_null_as(O_WRONLY, STDERR_FILENO);
402
403 case EXEC_OUTPUT_TTY:
4f2d528d 404 if (is_terminal_input(i))
80876c20
LP		 405 return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
406
407 /* We don't reset the terminal if this is just about output */
408 return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
409
410 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 411 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 412 case EXEC_OUTPUT_KMSG:
28dbc1e8 413 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
4f2d528d
LP		 414 return connect_logger_as(context, e, ident, STDERR_FILENO);
415
416 case EXEC_OUTPUT_SOCKET:
417 assert(socket_fd >= 0);
418 return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347
LP		 419
420 default:
80876c20 421 assert_not_reached("Unknown error type");
94f04347 422 }
071830ff
LP		 423}
424
02a51aba
LP		 425static int chown_terminal(int fd, uid_t uid) {
426 struct stat st;
427
428 assert(fd >= 0);
02a51aba
LP		 429
430 /* This might fail. What matters are the results. */
bab45044
LP		 431 (void) fchown(fd, uid, -1);
432 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 433
434 if (fstat(fd, &st) < 0)
435 return -errno;
436
d8b4e2e9 437 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 438 return -EPERM;
439
440 return 0;
441}
442
80876c20
LP		 443static int setup_confirm_stdio(const ExecContext *context,
444 int *_saved_stdin,
445 int *_saved_stdout) {
446 int fd = -1, saved_stdin, saved_stdout = -1, r;
447
448 assert(context);
449 assert(_saved_stdin);
450 assert(_saved_stdout);
451
452 /* This returns positive EXIT_xxx return values instead of
453 * negative errno style values! */
454
455 if ((saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3)) < 0)
456 return EXIT_STDIN;
457
458 if ((saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3)) < 0) {
459 r = EXIT_STDOUT;
460 goto fail;
461 }
462
463 if ((fd = acquire_terminal(
464 tty_path(context),
465 context->std_input == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 466 context->std_input == EXEC_INPUT_TTY_FORCE,
467 false)) < 0) {
80876c20
LP		 468 r = EXIT_STDIN;
469 goto fail;
470 }
471
02a51aba
LP		 472 if (chown_terminal(fd, getuid()) < 0) {
473 r = EXIT_STDIN;
474 goto fail;
475 }
476
80876c20
LP		 477 if (dup2(fd, STDIN_FILENO) < 0) {
478 r = EXIT_STDIN;
479 goto fail;
480 }
481
482 if (dup2(fd, STDOUT_FILENO) < 0) {
483 r = EXIT_STDOUT;
484 goto fail;
485 }
486
487 if (fd >= 2)
488 close_nointr_nofail(fd);
489
490 *_saved_stdin = saved_stdin;
491 *_saved_stdout = saved_stdout;
492
493 return 0;
494
495fail:
496 if (saved_stdout >= 0)
497 close_nointr_nofail(saved_stdout);
498
499 if (saved_stdin >= 0)
500 close_nointr_nofail(saved_stdin);
501
502 if (fd >= 0)
503 close_nointr_nofail(fd);
504
505 return r;
506}
507
2608882f 508static int restore_confirm_stdio(const ExecContext *context,
80876c20
LP		 509 int *saved_stdin,
510 int *saved_stdout,
511 bool *keep_stdin,
512 bool *keep_stdout) {
513
514 assert(context);
515 assert(saved_stdin);
516 assert(*saved_stdin >= 0);
517 assert(saved_stdout);
518 assert(*saved_stdout >= 0);
519
520 /* This returns positive EXIT_xxx return values instead of
521 * negative errno style values! */
522
523 if (is_terminal_input(context->std_input)) {
524
525 /* The service wants terminal input. */
526
527 *keep_stdin = true;
528 *keep_stdout =
529 context->std_output == EXEC_OUTPUT_INHERIT ||
530 context->std_output == EXEC_OUTPUT_TTY;
531
532 } else {
533 /* If the service doesn't want a controlling terminal,
534 * then we need to get rid entirely of what we have
535 * already. */
536
537 if (release_terminal() < 0)
538 return EXIT_STDIN;
539
540 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
541 return EXIT_STDIN;
542
543 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
544 return EXIT_STDOUT;
545
546 *keep_stdout = *keep_stdin = false;
547 }
548
549 return 0;
550}
551
81a2b7ce
LP		 552static int get_group_creds(const char *groupname, gid_t *gid) {
553 struct group *g;
ddd88763 554 gid_t id;
81a2b7ce
LP		 555
556 assert(groupname);
557 assert(gid);
558
559 /* We enforce some special rules for gid=0: in order to avoid
560 * NSS lookups for root we hardcode its data. */
561
562 if (streq(groupname, "root") || streq(groupname, "0")) {
563 *gid = 0;
564 return 0;
565 }
566
ddd88763 567 if (parse_gid(groupname, &id) >= 0) {
81a2b7ce 568 errno = 0;
ddd88763 569 g = getgrgid(id);
81a2b7ce
LP		 570 } else {
571 errno = 0;
572 g = getgrnam(groupname);
573 }
574
575 if (!g)
576 return errno != 0 ? -errno : -ESRCH;
577
578 *gid = g->gr_gid;
579 return 0;
580}
581
81a2b7ce
LP		 582static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
583 bool keep_groups = false;
584 int r;
585
586 assert(context);
587
35b8ca3a 588 /* Lookup and set GID and supplementary group list. Here too
81a2b7ce
LP		 589 * we avoid NSS lookups for gid=0. */
590
591 if (context->group || username) {
592
593 if (context->group)
594 if ((r = get_group_creds(context->group, &gid)) < 0)
595 return r;
596
597 /* First step, initialize groups from /etc/groups */
598 if (username && gid != 0) {
599 if (initgroups(username, gid) < 0)
600 return -errno;
601
602 keep_groups = true;
603 }
604
605 /* Second step, set our gids */
606 if (setresgid(gid, gid, gid) < 0)
607 return -errno;
608 }
609
610 if (context->supplementary_groups) {
611 int ngroups_max, k;
612 gid_t *gids;
613 char **i;
614
615 /* Final step, initialize any manually set supplementary groups */
da19d5c1 616 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
81a2b7ce
LP		 617
618 if (!(gids = new(gid_t, ngroups_max)))
619 return -ENOMEM;
620
621 if (keep_groups) {
622 if ((k = getgroups(ngroups_max, gids)) < 0) {
623 free(gids);
624 return -errno;
625 }
626 } else
627 k = 0;
628
629 STRV_FOREACH(i, context->supplementary_groups) {
630
631 if (k >= ngroups_max) {
632 free(gids);
633 return -E2BIG;
634 }
635
636 if ((r = get_group_creds(*i, gids+k)) < 0) {
637 free(gids);
638 return r;
639 }
640
641 k++;
642 }
643
644 if (setgroups(k, gids) < 0) {
645 free(gids);
646 return -errno;
647 }
648
649 free(gids);
650 }
651
652 return 0;
653}
654
655static int enforce_user(const ExecContext *context, uid_t uid) {
656 int r;
657 assert(context);
658
659 /* Sets (but doesn't lookup) the uid and make sure we keep the
660 * capabilities while doing so. */
661
662 if (context->capabilities) {
663 cap_t d;
664 static const cap_value_t bits[] = {
665 CAP_SETUID, /* Necessary so that we can run setresuid() below */
666 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
667 };
668
669 /* First step: If we need to keep capabilities but
670 * drop privileges we need to make sure we keep our
35b8ca3a 671 * caps, whiel we drop privileges. */
693ced48
LP		 672 if (uid != 0) {
673 int sb = context->secure_bits|SECURE_KEEP_CAPS;
674
675 if (prctl(PR_GET_SECUREBITS) != sb)
676 if (prctl(PR_SET_SECUREBITS, sb) < 0)
677 return -errno;
678 }
81a2b7ce 679
35b8ca3a 680 /* Second step: set the capabilities. This will reduce
81a2b7ce
LP		 681 * the capabilities to the minimum we need. */
682
683 if (!(d = cap_dup(context->capabilities)))
684 return -errno;
685
686 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
687 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
688 r = -errno;
689 cap_free(d);
690 return r;
691 }
692
693 if (cap_set_proc(d) < 0) {
694 r = -errno;
695 cap_free(d);
696 return r;
697 }
698
699 cap_free(d);
700 }
701
702 /* Third step: actually set the uids */
703 if (setresuid(uid, uid, uid) < 0)
704 return -errno;
705
706 /* At this point we should have all necessary capabilities but
707 are otherwise a normal user. However, the caps might got
708 corrupted due to the setresuid() so we need clean them up
709 later. This is done outside of this call. */
710
711 return 0;
712}
713
5b6319dc
LP		 714#ifdef HAVE_PAM
715
716static int null_conv(
717 int num_msg,
718 const struct pam_message **msg,
719 struct pam_response **resp,
720 void *appdata_ptr) {
721
722 /* We don't support conversations */
723
724 return PAM_CONV_ERR;
725}
726
727static int setup_pam(
728 const char *name,
729 const char *user,
730 const char *tty,
731 char ***pam_env,
732 int fds[], unsigned n_fds) {
733
734 static const struct pam_conv conv = {
735 .conv = null_conv,
736 .appdata_ptr = NULL
737 };
738
739 pam_handle_t *handle = NULL;
740 sigset_t ss, old_ss;
741 int pam_code = PAM_SUCCESS;
742 char **e = NULL;
743 bool close_session = false;
744 pid_t pam_pid = 0, parent_pid;
745
746 assert(name);
747 assert(user);
748 assert(pam_env);
749
750 /* We set up PAM in the parent process, then fork. The child
35b8ca3a 751 * will then stay around until killed via PR_GET_PDEATHSIG or
5b6319dc
LP		 752 * systemd via the cgroup logic. It will then remove the PAM
753 * session again. The parent process will exec() the actual
754 * daemon. We do things this way to ensure that the main PID
755 * of the daemon is the one we initially fork()ed. */
756
757 if ((pam_code = pam_start(name, user, &conv, &handle)) != PAM_SUCCESS) {
758 handle = NULL;
759 goto fail;
760 }
761
762 if (tty)
763 if ((pam_code = pam_set_item(handle, PAM_TTY, tty)) != PAM_SUCCESS)
764 goto fail;
765
766 if ((pam_code = pam_acct_mgmt(handle, PAM_SILENT)) != PAM_SUCCESS)
767 goto fail;
768
769 if ((pam_code = pam_open_session(handle, PAM_SILENT)) != PAM_SUCCESS)
770 goto fail;
771
772 close_session = true;
773
5b6319dc
LP		 774 if ((!(e = pam_getenvlist(handle)))) {
775 pam_code = PAM_BUF_ERR;
776 goto fail;
777 }
778
779 /* Block SIGTERM, so that we know that it won't get lost in
780 * the child */
781 if (sigemptyset(&ss) < 0 ||
782 sigaddset(&ss, SIGTERM) < 0 ||
783 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
784 goto fail;
785
786 parent_pid = getpid();
787
788 if ((pam_pid = fork()) < 0)
789 goto fail;
790
791 if (pam_pid == 0) {
792 int sig;
793 int r = EXIT_PAM;
794
795 /* The child's job is to reset the PAM session on
796 * termination */
797
798 /* This string must fit in 10 chars (i.e. the length
799 * of "/sbin/init") */
3dead8d9 800 rename_process("sd(PAM)");
5b6319dc
LP		 801
802 /* Make sure we don't keep open the passed fds in this
803 child. We assume that otherwise only those fds are
804 open here that have been opened by PAM. */
805 close_many(fds, n_fds);
806
807 /* Wait until our parent died. This will most likely
808 * not work since the kernel does not allow
35b8ca3a 809 * unprivileged parents kill their privileged children
5b6319dc
LP		 810 * this way. We rely on the control groups kill logic
811 * to do the rest for us. */
812 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
813 goto child_finish;
814
815 /* Check if our parent process might already have
816 * died? */
817 if (getppid() == parent_pid) {
3dead8d9
LP		 818 for (;;) {
819 if (sigwait(&ss, &sig) < 0) {
820 if (errno == EINTR)
821 continue;
822
823 goto child_finish;
824 }
5b6319dc 825
3dead8d9
LP		 826 assert(sig == SIGTERM);
827 break;
828 }
5b6319dc
LP		 829 }
830
3dead8d9 831 /* If our parent died we'll end the session */
5b6319dc
LP		 832 if (getppid() != parent_pid)
833 if ((pam_code = pam_close_session(handle, PAM_DATA_SILENT)) != PAM_SUCCESS)
834 goto child_finish;
835
836 r = 0;
837
838 child_finish:
839 pam_end(handle, pam_code | PAM_DATA_SILENT);
840 _exit(r);
841 }
842
843 /* If the child was forked off successfully it will do all the
844 * cleanups, so forget about the handle here. */
845 handle = NULL;
846
3b8bddde 847 /* Unblock SIGTERM again in the parent */
5b6319dc
LP		 848 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
849 goto fail;
850
851 /* We close the log explicitly here, since the PAM modules
852 * might have opened it, but we don't want this fd around. */
853 closelog();
854
aa87e624
LP		 855 *pam_env = e;
856 e = NULL;
857
5b6319dc
LP		 858 return 0;
859
860fail:
861 if (handle) {
862 if (close_session)
863 pam_code = pam_close_session(handle, PAM_DATA_SILENT);
864
865 pam_end(handle, pam_code | PAM_DATA_SILENT);
866 }
867
868 strv_free(e);
869
870 closelog();
871
430c18ed 872 if (pam_pid > 1) {
5b6319dc 873 kill(pam_pid, SIGTERM);
430c18ed
LP		 874 kill(pam_pid, SIGCONT);
875 }
5b6319dc
LP		 876
877 return EXIT_PAM;
878}
879#endif
880
73090dc8
LP		 881static int do_capability_bounding_set_drop(uint64_t drop) {
882 unsigned long i;
883 cap_t old_cap = NULL, new_cap = NULL;
884 cap_flag_value_t fv;
885 int r;
886
887 /* If we are run as PID 1 we will lack CAP_SETPCAP by default
888 * in the effective set (yes, the kernel drops that when
889 * executing init!), so get it back temporarily so that we can
890 * call PR_CAPBSET_DROP. */
891
892 old_cap = cap_get_proc();
893 if (!old_cap)
894 return -errno;
895
896 if (cap_get_flag(old_cap, CAP_SETPCAP, CAP_EFFECTIVE, &fv) < 0) {
897 r = -errno;
898 goto finish;
899 }
900
901 if (fv != CAP_SET) {
902 static const cap_value_t v = CAP_SETPCAP;
903
904 new_cap = cap_dup(old_cap);
905 if (!new_cap) {
906 r = -errno;
907 goto finish;
908 }
909
910 if (cap_set_flag(new_cap, CAP_EFFECTIVE, 1, &v, CAP_SET) < 0) {
911 r = -errno;
912 goto finish;
913 }
914
915 if (cap_set_proc(new_cap) < 0) {
916 r = -errno;
917 goto finish;
918 }
919 }
920
ae556c21 921 for (i = 0; i <= MAX(63LU, (unsigned long) CAP_LAST_CAP); i++)
73090dc8
LP		 922 if (drop & ((uint64_t) 1ULL << (uint64_t) i)) {
923 if (prctl(PR_CAPBSET_DROP, i) < 0) {
ae556c21
LP		 924 if (errno == EINVAL)
925 break;
926
73090dc8
LP		 927 r = -errno;
928 goto finish;
929 }
930 }
931
932 r = 0;
933
934finish:
935 if (new_cap)
936 cap_free(new_cap);
937
938 if (old_cap) {
939 cap_set_proc(old_cap);
940 cap_free(old_cap);
941 }
942
943 return r;
944}
945
9fb86720 946int exec_spawn(ExecCommand *command,
9e2f7c11 947 char **argv,
81a2b7ce 948 const ExecContext *context,
c2748801 949 int fds[], unsigned n_fds,
1137a57c 950 char **environment,
81a2b7ce
LP		 951 bool apply_permissions,
952 bool apply_chroot,
1e3ad081 953 bool apply_tty_stdin,
80876c20 954 bool confirm_spawn,
8e274523 955 CGroupBonding *cgroup_bondings,
81a2b7ce
LP		 956 pid_t *ret) {
957
034c6ed7 958 pid_t pid;
8e274523 959 int r;
1a63a750 960 char *line;
4f2d528d 961 int socket_fd;
8c7be95e 962 char **files_env = NULL;
034c6ed7 963
5cb5a6ff
LP		 964 assert(command);
965 assert(context);
966 assert(ret);
034c6ed7
LP		 967 assert(fds || n_fds <= 0);
968
4f2d528d
LP		 969 if (context->std_input == EXEC_INPUT_SOCKET ||
970 context->std_output == EXEC_OUTPUT_SOCKET ||
971 context->std_error == EXEC_OUTPUT_SOCKET) {
972
973 if (n_fds != 1)
974 return -EINVAL;
975
976 socket_fd = fds[0];
977
978 fds = NULL;
979 n_fds = 0;
980 } else
981 socket_fd = -1;
982
8c7be95e
LP		 983 if ((r = exec_context_load_environment(context, &files_env)) < 0) {
984 log_error("Failed to load environment files: %s", strerror(-r));
985 return r;
986 }
987
9e2f7c11
LP		 988 if (!argv)
989 argv = command->argv;
990
8c7be95e
LP		 991 if (!(line = exec_command_line(argv))) {
992 r = -ENOMEM;
993 goto fail_parent;
994 }
1a63a750
LP		 995
996 log_debug("About to execute: %s", line);
997 free(line);
acbb0225 998
8e274523
LP		 999 if (cgroup_bondings)
1000 if ((r = cgroup_bonding_realize_list(cgroup_bondings)))
8c7be95e 1001 goto fail_parent;
8e274523 1002
8c7be95e
LP		 1003 if ((pid = fork()) < 0) {
1004 r = -errno;
1005 goto fail_parent;
1006 }
034c6ed7
LP		 1007
1008 if (pid == 0) {
8e274523 1009 int i;
309bff19 1010 sigset_t ss;
81a2b7ce
LP		 1011 const char *username = NULL, *home = NULL;
1012 uid_t uid = (uid_t) -1;
1013 gid_t gid = (gid_t) -1;
fab56fc5 1014 char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
81a2b7ce 1015 unsigned n_env = 0;
80876c20
LP		 1016 int saved_stdout = -1, saved_stdin = -1;
1017 bool keep_stdout = false, keep_stdin = false;
309bff19 1018
034c6ed7 1019 /* child */
5cb5a6ff 1020
5b6319dc
LP		 1021 /* This string must fit in 10 chars (i.e. the length
1022 * of "/sbin/init") */
aa87e624 1023 rename_process("sd(EXEC)");
5b6319dc 1024
1b91d3e8
LP		 1025 /* We reset exactly these signals, since they are the
1026 * only ones we set to SIG_IGN in the main daemon. All
1027 * others we leave untouched because we set them to
1028 * SIG_DFL or a valid handler initially, both of which
1029 * will be demoted to SIG_DFL. */
1030 default_signals(SIGNALS_CRASH_HANDLER,
9a34ec5f 1031 SIGNALS_IGNORE, -1);
7b683879 1032
309bff19
LP		 1033 if (sigemptyset(&ss) < 0 ||
1034 sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
1035 r = EXIT_SIGNAL_MASK;
8c7be95e 1036 goto fail_child;
309bff19
LP		 1037 }
1038
85d73053
LP		 1039 /* Close sockets very early to make sure we don't
1040 * block init reexecution because it cannot bind its
1041 * sockets */
73883adc
LP		 1042 if (close_all_fds(socket_fd >= 0 ? &socket_fd : fds,
1043 socket_fd >= 0 ? 1 : n_fds) < 0) {
fc9b2a84 1044 r = EXIT_FDS;
8c7be95e 1045 goto fail_child;
fc9b2a84
LP		 1046 }
1047
74922904 1048 if (!context->same_pgrp)
8d567588
LP		 1049 if (setsid() < 0) {
1050 r = EXIT_SETSID;
8c7be95e 1051 goto fail_child;
8d567588 1052 }
80876c20 1053
c5da34ef
LP		 1054 if (context->tcpwrap_name) {
1055 if (socket_fd >= 0)
1056 if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
1057 r = EXIT_TCPWRAP;
8c7be95e 1058 goto fail_child;
c5da34ef
LP		 1059 }
1060
1061 for (i = 0; i < (int) n_fds; i++) {
1062 if (!socket_tcpwrap(fds[i], context->tcpwrap_name)) {
1063 r = EXIT_TCPWRAP;
8c7be95e 1064 goto fail_child;
c5da34ef 1065 }
df1f0afe 1066 }
c5da34ef 1067 }
df1f0afe 1068
6ea832a2
LP		 1069 exec_context_tty_reset(context);
1070
1e3ad081
LP		 1071 /* We skip the confirmation step if we shall not apply the TTY */
1072 if (confirm_spawn &&
1073 (!is_terminal_input(context->std_input) || apply_tty_stdin)) {
80876c20
LP		 1074 char response;
1075
1076 /* Set up terminal for the question */
1077 if ((r = setup_confirm_stdio(context,
1078 &saved_stdin, &saved_stdout)))
8c7be95e 1079 goto fail_child;
80876c20
LP		 1080
1081 /* Now ask the question. */
9e2f7c11 1082 if (!(line = exec_command_line(argv))) {
80876c20 1083 r = EXIT_MEMORY;
8c7be95e 1084 goto fail_child;
ee2b4894 1085 }
80876c20
LP		 1086
1087 r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line);
1088 free(line);
1089
1090 if (r < 0 || response == 'n') {
1091 r = EXIT_CONFIRM;
8c7be95e 1092 goto fail_child;
80876c20
LP		 1093 } else if (response == 's') {
1094 r = 0;
8c7be95e 1095 goto fail_child;
ee2b4894 1096 }
80876c20
LP		 1097
1098 /* Release terminal for the question */
2608882f 1099 if ((r = restore_confirm_stdio(context,
80876c20
LP		 1100 &saved_stdin, &saved_stdout,
1101 &keep_stdin, &keep_stdout)))
8c7be95e 1102 goto fail_child;
034c6ed7
LP		 1103 }
1104
da726a4d
LP		 1105 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1106 * must sure to drop O_NONBLOCK */
1107 if (socket_fd >= 0)
1108 fd_nonblock(socket_fd, false);
1109
80876c20 1110 if (!keep_stdin)
1e3ad081 1111 if (setup_input(context, socket_fd, apply_tty_stdin) < 0) {
80876c20 1112 r = EXIT_STDIN;
8c7be95e 1113 goto fail_child;
80876c20 1114 }
9eba9da4 1115
80876c20 1116 if (!keep_stdout)
1e3ad081 1117 if (setup_output(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin) < 0) {
80876c20 1118 r = EXIT_STDOUT;
8c7be95e 1119 goto fail_child;
80876c20 1120 }
94f04347 1121
1e3ad081 1122 if (setup_error(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin) < 0) {
80876c20 1123 r = EXIT_STDERR;
8c7be95e 1124 goto fail_child;
071830ff
LP		 1125 }
1126
8e274523 1127 if (cgroup_bondings)
e364ad06 1128 if (cgroup_bonding_install_list(cgroup_bondings, 0) < 0) {
8e274523 1129 r = EXIT_CGROUP;
8c7be95e 1130 goto fail_child;
8e274523
LP		 1131 }
1132
dd6c17b1 1133 if (context->oom_score_adjust_set) {
fb33a393 1134 char t[16];
034c6ed7 1135
dd6c17b1 1136 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
fb33a393 1137 char_array_0(t);
034c6ed7 1138
dd6c17b1
LP		 1139 if (write_one_line_file("/proc/self/oom_score_adj", t) < 0) {
1140 /* Compatibility with Linux <= 2.6.35 */
1141
1142 int adj;
1143
1144 adj = (context->oom_score_adjust * -OOM_DISABLE) / OOM_SCORE_ADJ_MAX;
1145 adj = CLAMP(adj, OOM_DISABLE, OOM_ADJUST_MAX);
1146
1147 snprintf(t, sizeof(t), "%i", adj);
1148 char_array_0(t);
1149
90a5f6e4
LP		 1150 if (write_one_line_file("/proc/self/oom_adj", t) < 0
1151 && errno != EACCES) {
dd6c17b1 1152 r = EXIT_OOM_ADJUST;
8c7be95e 1153 goto fail_child;
dd6c17b1 1154 }
fb33a393 1155 }
034c6ed7
LP		 1156 }
1157
fb33a393
LP		 1158 if (context->nice_set)
1159 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1160 r = EXIT_NICE;
8c7be95e 1161 goto fail_child;
fb33a393
LP		 1162 }
1163
94f04347
LP		 1164 if (context->cpu_sched_set) {
1165 struct sched_param param;
1166
1167 zero(param);
1168 param.sched_priority = context->cpu_sched_priority;
1169
38b48754
LP		 1170 if (sched_setscheduler(0, context->cpu_sched_policy |
1171 (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
94f04347 1172 r = EXIT_SETSCHEDULER;
8c7be95e 1173 goto fail_child;
94f04347
LP		 1174 }
1175 }
1176
82c121a4
LP		 1177 if (context->cpuset)
1178 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
94f04347 1179 r = EXIT_CPUAFFINITY;
8c7be95e 1180 goto fail_child;
94f04347
LP		 1181 }
1182
9eba9da4
LP		 1183 if (context->ioprio_set)
1184 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1185 r = EXIT_IOPRIO;
8c7be95e 1186 goto fail_child;
9eba9da4
LP		 1187 }
1188
03fae018
LP		 1189 if (context->timer_slack_nsec_set)
1190 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
94f04347 1191 r = EXIT_TIMERSLACK;
8c7be95e 1192 goto fail_child;
94f04347
LP		 1193 }
1194
169c1bda
LP		 1195 if (context->utmp_id)
1196 utmp_put_init_process(0, context->utmp_id, getpid(), getsid(0), context->tty_path);
1197
81a2b7ce
LP		 1198 if (context->user) {
1199 username = context->user;
1200 if (get_user_creds(&username, &uid, &gid, &home) < 0) {
1201 r = EXIT_USER;
8c7be95e 1202 goto fail_child;
81a2b7ce 1203 }
d8b4e2e9
LP		 1204
1205 if (is_terminal_input(context->std_input))
1206 if (chown_terminal(STDIN_FILENO, uid) < 0) {
1207 r = EXIT_STDIN;
8c7be95e 1208 goto fail_child;
d8b4e2e9 1209 }
64747e2d
LP		 1210
1211 if (cgroup_bondings && context->control_group_modify)
1212 if (cgroup_bonding_set_group_access_list(cgroup_bondings, 0755, uid, gid) < 0 ||
1213 cgroup_bonding_set_task_access_list(cgroup_bondings, 0644, uid, gid) < 0) {
1214 r = EXIT_CGROUP;
1215 goto fail_child;
1216 }
81a2b7ce
LP		 1217 }
1218
3b8bddde
LP		 1219 if (apply_permissions)
1220 if (enforce_groups(context, username, uid) < 0) {
1221 r = EXIT_GROUP;
1222 goto fail_child;
1223 }
1224
1225 umask(context->umask);
1226
5b6319dc
LP		 1227#ifdef HAVE_PAM
1228 if (context->pam_name && username) {
7fbf31df 1229 if (setup_pam(context->pam_name, username, context->tty_path, &pam_env, fds, n_fds) != 0) {
5b6319dc 1230 r = EXIT_PAM;
8c7be95e 1231 goto fail_child;
5b6319dc
LP		 1232 }
1233 }
1234#endif
1235
04aa0cb9
LP		 1236 if (strv_length(context->read_write_dirs) > 0 ||
1237 strv_length(context->read_only_dirs) > 0 ||
1238 strv_length(context->inaccessible_dirs) > 0 ||
1239 context->mount_flags != MS_SHARED ||
1240 context->private_tmp)
1241 if ((r = setup_namespace(
1242 context->read_write_dirs,
1243 context->read_only_dirs,
1244 context->inaccessible_dirs,
1245 context->private_tmp,
1246 context->mount_flags)) < 0)
8c7be95e 1247 goto fail_child;
04aa0cb9 1248
81a2b7ce
LP		 1249 if (apply_chroot) {
1250 if (context->root_directory)
1251 if (chroot(context->root_directory) < 0) {
1252 r = EXIT_CHROOT;
8c7be95e 1253 goto fail_child;
81a2b7ce
LP		 1254 }
1255
1256 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1257 r = EXIT_CHDIR;
8c7be95e 1258 goto fail_child;
81a2b7ce
LP		 1259 }
1260 } else {
1261
1262 char *d;
1263
1264 if (asprintf(&d, "%s/%s",
1265 context->root_directory ? context->root_directory : "",
1266 context->working_directory ? context->working_directory : "") < 0) {
1267 r = EXIT_MEMORY;
8c7be95e 1268 goto fail_child;
81a2b7ce
LP		 1269 }
1270
1271 if (chdir(d) < 0) {
1272 free(d);
1273 r = EXIT_CHDIR;
8c7be95e 1274 goto fail_child;
81a2b7ce
LP		 1275 }
1276
1277 free(d);
1278 }
1279
fc9b2a84
LP		 1280 /* We repeat the fd closing here, to make sure that
1281 * nothing is leaked from the PAM modules */
a0d40ac5 1282 if (close_all_fds(fds, n_fds) < 0 ||
47a71eed 1283 shift_fds(fds, n_fds) < 0 ||
451a074f 1284 flags_fds(fds, n_fds, context->non_blocking) < 0) {
034c6ed7 1285 r = EXIT_FDS;
8c7be95e 1286 goto fail_child;
034c6ed7
LP		 1287 }
1288
81a2b7ce 1289 if (apply_permissions) {
034c6ed7 1290
81a2b7ce
LP		 1291 for (i = 0; i < RLIMIT_NLIMITS; i++) {
1292 if (!context->rlimit[i])
1293 continue;
1294
1295 if (setrlimit(i, context->rlimit[i]) < 0) {
1296 r = EXIT_LIMITS;
8c7be95e 1297 goto fail_child;
81a2b7ce 1298 }
034c6ed7 1299 }
034c6ed7 1300
260abb78 1301 if (context->capability_bounding_set_drop)
73090dc8
LP		 1302 if (do_capability_bounding_set_drop(context->capability_bounding_set_drop) < 0) {
1303 r = EXIT_CAPABILITIES;
1304 goto fail_child;
1305 }
260abb78 1306
81a2b7ce
LP		 1307 if (context->user)
1308 if (enforce_user(context, uid) < 0) {
1309 r = EXIT_USER;
8c7be95e 1310 goto fail_child;
81a2b7ce
LP		 1311 }
1312
35b8ca3a 1313 /* PR_GET_SECUREBITS is not privileged, while
693ced48
LP		 1314 * PR_SET_SECUREBITS is. So to suppress
1315 * potential EPERMs we'll try not to call
1316 * PR_SET_SECUREBITS unless necessary. */
1317 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1318 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1319 r = EXIT_SECUREBITS;
8c7be95e 1320 goto fail_child;
693ced48 1321 }
81a2b7ce
LP		 1322
1323 if (context->capabilities)
1324 if (cap_set_proc(context->capabilities) < 0) {
1325 r = EXIT_CAPABILITIES;
8c7be95e 1326 goto fail_child;
81a2b7ce 1327 }
94f04347
LP		 1328 }
1329
e3aa71c3 1330 if (!(our_env = new0(char*, 7))) {
81a2b7ce 1331 r = EXIT_MEMORY;
8c7be95e 1332 goto fail_child;
81a2b7ce 1333 }
034c6ed7 1334
81a2b7ce 1335 if (n_fds > 0)
bb00e604 1336 if (asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 ||
81a2b7ce
LP		 1337 asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
1338 r = EXIT_MEMORY;
8c7be95e 1339 goto fail_child;
81a2b7ce 1340 }
034c6ed7 1341
81a2b7ce
LP		 1342 if (home)
1343 if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
1344 r = EXIT_MEMORY;
8c7be95e 1345 goto fail_child;
81a2b7ce 1346 }
034c6ed7 1347
81a2b7ce
LP		 1348 if (username)
1349 if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
1350 asprintf(our_env + n_env++, "USER=%s", username) < 0) {
1351 r = EXIT_MEMORY;
8c7be95e 1352 goto fail_child;
81a2b7ce 1353 }
034c6ed7 1354
e3aa71c3
LP		 1355 if (is_terminal_input(context->std_input) ||
1356 context->std_output == EXEC_OUTPUT_TTY ||
1357 context->std_error == EXEC_OUTPUT_TTY)
1358 if (!(our_env[n_env++] = strdup(default_term_for_tty(tty_path(context))))) {
1359 r = EXIT_MEMORY;
8c7be95e 1360 goto fail_child;
e3aa71c3
LP		 1361 }
1362
1363 assert(n_env <= 7);
4e85aff4 1364
5b6319dc 1365 if (!(final_env = strv_env_merge(
8c7be95e 1366 5,
5b6319dc
LP		 1367 environment,
1368 our_env,
1369 context->environment,
8c7be95e 1370 files_env,
5b6319dc
LP		 1371 pam_env,
1372 NULL))) {
81a2b7ce 1373 r = EXIT_MEMORY;
8c7be95e 1374 goto fail_child;
81a2b7ce 1375 }
034c6ed7 1376
fab56fc5
LP		 1377 if (!(final_argv = replace_env_argv(argv, final_env))) {
1378 r = EXIT_MEMORY;
8c7be95e 1379 goto fail_child;
fab56fc5
LP		 1380 }
1381
a6ff950e
LP		 1382 final_env = strv_env_clean(final_env);
1383
fab56fc5 1384 execve(command->path, final_argv, final_env);
034c6ed7
LP		 1385 r = EXIT_EXEC;
1386
8c7be95e 1387 fail_child:
81a2b7ce
LP		 1388 strv_free(our_env);
1389 strv_free(final_env);
5b6319dc 1390 strv_free(pam_env);
8c7be95e 1391 strv_free(files_env);
fab56fc5 1392 strv_free(final_argv);
81a2b7ce 1393
80876c20
LP		 1394 if (saved_stdin >= 0)
1395 close_nointr_nofail(saved_stdin);
1396
1397 if (saved_stdout >= 0)
1398 close_nointr_nofail(saved_stdout);
1399
034c6ed7
LP		 1400 _exit(r);
1401 }
1402
8c7be95e
LP		 1403 strv_free(files_env);
1404
80876c20
LP		 1405 /* We add the new process to the cgroup both in the child (so
1406 * that we can be sure that no user code is ever executed
1407 * outside of the cgroup) and in the parent (so that we can be
1408 * sure that when we kill the cgroup the process will be
1409 * killed too). */
1410 if (cgroup_bondings)
4e85aff4 1411 cgroup_bonding_install_list(cgroup_bondings, pid);
2da3263a 1412
bb00e604 1413 log_debug("Forked %s as %lu", command->path, (unsigned long) pid);
2da3263a 1414
b58b4116 1415 exec_status_start(&command->exec_status, pid);
9fb86720 1416
034c6ed7 1417 *ret = pid;
5cb5a6ff 1418 return 0;
8c7be95e
LP		 1419
1420fail_parent:
1421 strv_free(files_env);
1422
1423 return r;
5cb5a6ff
LP		 1424}
1425
034c6ed7
LP		 1426void exec_context_init(ExecContext *c) {
1427 assert(c);
1428
1429 c->umask = 0002;
9eba9da4 1430 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1431 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1432 c->syslog_priority = LOG_DAEMON|LOG_INFO;
74922904 1433 c->syslog_level_prefix = true;
15ae422b 1434 c->mount_flags = MS_SHARED;
2e22afe9 1435 c->kill_signal = SIGTERM;
ba035df2 1436 c->send_sigkill = true;
034c6ed7
LP		 1437}
1438
1439void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1440 unsigned l;
1441
1442 assert(c);
1443
1444 strv_free(c->environment);
034c6ed7 1445 c->environment = NULL;
5cb5a6ff 1446
8c7be95e
LP		 1447 strv_free(c->environment_files);
1448 c->environment_files = NULL;
1449
034c6ed7 1450 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1451 free(c->rlimit[l]);
034c6ed7
LP		 1452 c->rlimit[l] = NULL;
1453 }
1454
9eba9da4
LP		 1455 free(c->working_directory);
1456 c->working_directory = NULL;
1457 free(c->root_directory);
1458 c->root_directory = NULL;
5cb5a6ff 1459
80876c20
LP		 1460 free(c->tty_path);
1461 c->tty_path = NULL;
1462
df1f0afe
LP		 1463 free(c->tcpwrap_name);
1464 c->tcpwrap_name = NULL;
1465
071830ff
LP		 1466 free(c->syslog_identifier);
1467 c->syslog_identifier = NULL;
1468
5cb5a6ff 1469 free(c->user);
034c6ed7
LP		 1470 c->user = NULL;
1471
5cb5a6ff 1472 free(c->group);
034c6ed7
LP		 1473 c->group = NULL;
1474
1475 strv_free(c->supplementary_groups);
1476 c->supplementary_groups = NULL;
94f04347 1477
5b6319dc
LP		 1478 free(c->pam_name);
1479 c->pam_name = NULL;
1480
94f04347
LP		 1481 if (c->capabilities) {
1482 cap_free(c->capabilities);
1483 c->capabilities = NULL;
1484 }
15ae422b
LP		 1485
1486 strv_free(c->read_only_dirs);
1487 c->read_only_dirs = NULL;
1488
1489 strv_free(c->read_write_dirs);
1490 c->read_write_dirs = NULL;
1491
1492 strv_free(c->inaccessible_dirs);
1493 c->inaccessible_dirs = NULL;
82c121a4
LP		 1494
1495 if (c->cpuset)
1496 CPU_FREE(c->cpuset);
86a3475b
LP		 1497
1498 free(c->utmp_id);
1499 c->utmp_id = NULL;
5cb5a6ff
LP		 1500}
1501
43d0fcbd
LP		 1502void exec_command_done(ExecCommand *c) {
1503 assert(c);
1504
1505 free(c->path);
1506 c->path = NULL;
1507
1508 strv_free(c->argv);
1509 c->argv = NULL;
1510}
1511
1512void exec_command_done_array(ExecCommand *c, unsigned n) {
1513 unsigned i;
1514
1515 for (i = 0; i < n; i++)
1516 exec_command_done(c+i);
1517}
1518
5cb5a6ff
LP		 1519void exec_command_free_list(ExecCommand *c) {
1520 ExecCommand *i;
1521
1522 while ((i = c)) {
034c6ed7 1523 LIST_REMOVE(ExecCommand, command, c, i);
43d0fcbd 1524 exec_command_done(i);
5cb5a6ff
LP		 1525 free(i);
1526 }
1527}
1528
034c6ed7
LP		 1529void exec_command_free_array(ExecCommand **c, unsigned n) {
1530 unsigned i;
1531
1532 for (i = 0; i < n; i++) {
1533 exec_command_free_list(c[i]);
1534 c[i] = NULL;
1535 }
1536}
1537
8c7be95e
LP		 1538int exec_context_load_environment(const ExecContext *c, char ***l) {
1539 char **i, **r = NULL;
1540
1541 assert(c);
1542 assert(l);
1543
1544 STRV_FOREACH(i, c->environment_files) {
1545 char *fn;
1546 int k;
1547 bool ignore = false;
1548 char **p;
1549
1550 fn = *i;
1551
1552 if (fn[0] == '-') {
1553 ignore = true;
1554 fn ++;
1555 }
1556
1557 if (!path_is_absolute(fn)) {
1558
1559 if (ignore)
1560 continue;
1561
1562 strv_free(r);
1563 return -EINVAL;
1564 }
1565
1566 if ((k = load_env_file(fn, &p)) < 0) {
1567
1568 if (ignore)
1569 continue;
1570
1571 strv_free(r);
1572 return k;
1573 }
1574
1575 if (r == NULL)
1576 r = p;
1577 else {
1578 char **m;
1579
1580 m = strv_env_merge(2, r, p);
1581 strv_free(r);
1582 strv_free(p);
1583
1584 if (!m)
1585 return -ENOMEM;
1586
1587 r = m;
1588 }
1589 }
1590
1591 *l = r;
1592
1593 return 0;
1594}
1595
15ae422b
LP		 1596static void strv_fprintf(FILE *f, char **l) {
1597 char **g;
1598
1599 assert(f);
1600
1601 STRV_FOREACH(g, l)
1602 fprintf(f, " %s", *g);
1603}
1604
5cb5a6ff 1605void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
94f04347
LP		 1606 char ** e;
1607 unsigned i;
9eba9da4 1608
5cb5a6ff
LP		 1609 assert(c);
1610 assert(f);
1611
1612 if (!prefix)
1613 prefix = "";
1614
1615 fprintf(f,
94f04347
LP		 1616 "%sUMask: %04o\n"
1617 "%sWorkingDirectory: %s\n"
451a074f 1618 "%sRootDirectory: %s\n"
15ae422b 1619 "%sNonBlocking: %s\n"
64747e2d
LP		 1620 "%sPrivateTmp: %s\n"
1621 "%sControlGroupModify: %s\n",
5cb5a6ff 1622 prefix, c->umask,
9eba9da4 1623 prefix, c->working_directory ? c->working_directory : "/",
451a074f 1624 prefix, c->root_directory ? c->root_directory : "/",
15ae422b 1625 prefix, yes_no(c->non_blocking),
64747e2d
LP		 1626 prefix, yes_no(c->private_tmp),
1627 prefix, yes_no(c->control_group_modify));
fb33a393 1628
8c7be95e
LP		 1629 STRV_FOREACH(e, c->environment)
1630 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
1631
1632 STRV_FOREACH(e, c->environment_files)
1633 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
94f04347 1634
df1f0afe
LP		 1635 if (c->tcpwrap_name)
1636 fprintf(f,
1637 "%sTCPWrapName: %s\n",
1638 prefix, c->tcpwrap_name);
1639
fb33a393
LP		 1640 if (c->nice_set)
1641 fprintf(f,
1642 "%sNice: %i\n",
1643 prefix, c->nice);
1644
dd6c17b1 1645 if (c->oom_score_adjust_set)
fb33a393 1646 fprintf(f,
dd6c17b1
LP		 1647 "%sOOMScoreAdjust: %i\n",
1648 prefix, c->oom_score_adjust);
9eba9da4 1649
94f04347
LP		 1650 for (i = 0; i < RLIM_NLIMITS; i++)
1651 if (c->rlimit[i])
ea430986 1652 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
94f04347 1653
9eba9da4
LP		 1654 if (c->ioprio_set)
1655 fprintf(f,
1656 "%sIOSchedulingClass: %s\n"
1657 "%sIOPriority: %i\n",
94f04347 1658 prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
9eba9da4 1659 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
94f04347
LP		 1660
1661 if (c->cpu_sched_set)
1662 fprintf(f,
1663 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 1664 "%sCPUSchedulingPriority: %i\n"
1665 "%sCPUSchedulingResetOnFork: %s\n",
94f04347 1666 prefix, sched_policy_to_string(c->cpu_sched_policy),
38b48754
LP		 1667 prefix, c->cpu_sched_priority,
1668 prefix, yes_no(c->cpu_sched_reset_on_fork));
94f04347 1669
82c121a4 1670 if (c->cpuset) {
94f04347 1671 fprintf(f, "%sCPUAffinity:", prefix);
82c121a4
LP		 1672 for (i = 0; i < c->cpuset_ncpus; i++)
1673 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
94f04347
LP		 1674 fprintf(f, " %i", i);
1675 fputs("\n", f);
1676 }
1677
03fae018
LP		 1678 if (c->timer_slack_nsec_set)
1679 fprintf(f, "%sTimerSlackNSec: %lu\n", prefix, c->timer_slack_nsec);
94f04347
LP		 1680
1681 fprintf(f,
80876c20
LP		 1682 "%sStandardInput: %s\n"
1683 "%sStandardOutput: %s\n"
1684 "%sStandardError: %s\n",
1685 prefix, exec_input_to_string(c->std_input),
1686 prefix, exec_output_to_string(c->std_output),
1687 prefix, exec_output_to_string(c->std_error));
1688
1689 if (c->tty_path)
1690 fprintf(f,
6ea832a2
LP		 1691 "%sTTYPath: %s\n"
1692 "%sTTYReset: %s\n"
1693 "%sTTYVHangup: %s\n"
1694 "%sTTYVTDisallocate: %s\n",
1695 prefix, c->tty_path,
1696 prefix, yes_no(c->tty_reset),
1697 prefix, yes_no(c->tty_vhangup),
1698 prefix, yes_no(c->tty_vt_disallocate));
94f04347 1699
9a6bca7a 1700 if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG ||
28dbc1e8
LP		 1701 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
1702 c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG ||
1703 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE)
94f04347
LP		 1704 fprintf(f,
1705 "%sSyslogFacility: %s\n"
1706 "%sSyslogLevel: %s\n",
7d76f312 1707 prefix, log_facility_unshifted_to_string(c->syslog_priority >> 3),
94f04347
LP		 1708 prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
1709
1710 if (c->capabilities) {
1711 char *t;
1712 if ((t = cap_to_text(c->capabilities, NULL))) {
1713 fprintf(f, "%sCapabilities: %s\n",
1714 prefix, t);
1715 cap_free(t);
1716 }
1717 }
1718
1719 if (c->secure_bits)
1720 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
1721 prefix,
1722 (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
1723 (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
1724 (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
1725 (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
1726 (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
1727 (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
1728
1729 if (c->capability_bounding_set_drop) {
ae556c21 1730 unsigned long l;
260abb78 1731 fprintf(f, "%sCapabilityBoundingSet:", prefix);
94f04347 1732
ae556c21
LP		 1733 for (l = 0; l <= (unsigned long) CAP_LAST_CAP; l++)
1734 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
94f04347
LP		 1735 char *t;
1736
ae556c21 1737 if ((t = cap_to_name(l))) {
94f04347 1738 fprintf(f, " %s", t);
260abb78 1739 cap_free(t);
94f04347
LP		 1740 }
1741 }
1742
1743 fputs("\n", f);
1744 }
1745
1746 if (c->user)
f2d3769a 1747 fprintf(f, "%sUser: %s\n", prefix, c->user);
94f04347 1748 if (c->group)
f2d3769a 1749 fprintf(f, "%sGroup: %s\n", prefix, c->group);
94f04347 1750
15ae422b 1751 if (strv_length(c->supplementary_groups) > 0) {
94f04347 1752 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 1753 strv_fprintf(f, c->supplementary_groups);
1754 fputs("\n", f);
1755 }
94f04347 1756
5b6319dc 1757 if (c->pam_name)
f2d3769a 1758 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
5b6319dc 1759
15ae422b
LP		 1760 if (strv_length(c->read_write_dirs) > 0) {
1761 fprintf(f, "%sReadWriteDirs:", prefix);
1762 strv_fprintf(f, c->read_write_dirs);
1763 fputs("\n", f);
1764 }
1765
1766 if (strv_length(c->read_only_dirs) > 0) {
1767 fprintf(f, "%sReadOnlyDirs:", prefix);
1768 strv_fprintf(f, c->read_only_dirs);
1769 fputs("\n", f);
1770 }
94f04347 1771
15ae422b
LP		 1772 if (strv_length(c->inaccessible_dirs) > 0) {
1773 fprintf(f, "%sInaccessibleDirs:", prefix);
1774 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 1775 fputs("\n", f);
1776 }
2e22afe9
LP		 1777
1778 fprintf(f,
1779 "%sKillMode: %s\n"
ba035df2
LP		 1780 "%sKillSignal: SIG%s\n"
1781 "%sSendSIGKILL: %s\n",
2e22afe9 1782 prefix, kill_mode_to_string(c->kill_mode),
ba035df2
LP		 1783 prefix, signal_to_string(c->kill_signal),
1784 prefix, yes_no(c->send_sigkill));
169c1bda
LP		 1785
1786 if (c->utmp_id)
1787 fprintf(f,
1788 "%sUtmpIdentifier: %s\n",
1789 prefix, c->utmp_id);
5cb5a6ff
LP		 1790}
1791
b58b4116 1792void exec_status_start(ExecStatus *s, pid_t pid) {
034c6ed7 1793 assert(s);
5cb5a6ff 1794
b58b4116
LP		 1795 zero(*s);
1796 s->pid = pid;
1797 dual_timestamp_get(&s->start_timestamp);
1798}
1799
6ea832a2 1800void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
b58b4116
LP		 1801 assert(s);
1802
1803 if ((s->pid && s->pid != pid) ||
1804 !s->start_timestamp.realtime <= 0)
1805 zero(*s);
1806
034c6ed7 1807 s->pid = pid;
63983207 1808 dual_timestamp_get(&s->exit_timestamp);
9fb86720 1809
034c6ed7
LP		 1810 s->code = code;
1811 s->status = status;
169c1bda 1812
6ea832a2
LP		 1813 if (context) {
1814 if (context->utmp_id)
1815 utmp_put_dead_process(context->utmp_id, pid, code, status);
1816
1817 exec_context_tty_reset(context);
1818 }
9fb86720
LP		 1819}
1820
1821void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
1822 char buf[FORMAT_TIMESTAMP_MAX];
1823
1824 assert(s);
1825 assert(f);
1826
1827 if (!prefix)
1828 prefix = "";
1829
1830 if (s->pid <= 0)
1831 return;
1832
1833 fprintf(f,
bb00e604
LP		 1834 "%sPID: %lu\n",
1835 prefix, (unsigned long) s->pid);
9fb86720 1836
63983207 1837 if (s->start_timestamp.realtime > 0)
9fb86720
LP		 1838 fprintf(f,
1839 "%sStart Timestamp: %s\n",
63983207 1840 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
9fb86720 1841
63983207 1842 if (s->exit_timestamp.realtime > 0)
9fb86720
LP		 1843 fprintf(f,
1844 "%sExit Timestamp: %s\n"
1845 "%sExit Code: %s\n"
1846 "%sExit Status: %i\n",
63983207 1847 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
9fb86720
LP		 1848 prefix, sigchld_code_to_string(s->code),
1849 prefix, s->status);
5cb5a6ff 1850}
44d8db9e 1851
9e2f7c11 1852char *exec_command_line(char **argv) {
44d8db9e
LP		 1853 size_t k;
1854 char *n, *p, **a;
1855 bool first = true;
1856
9e2f7c11 1857 assert(argv);
44d8db9e 1858
9164977d 1859 k = 1;
9e2f7c11 1860 STRV_FOREACH(a, argv)
44d8db9e
LP		 1861 k += strlen(*a)+3;
1862
1863 if (!(n = new(char, k)))
1864 return NULL;
1865
1866 p = n;
9e2f7c11 1867 STRV_FOREACH(a, argv) {
44d8db9e
LP		 1868
1869 if (!first)
1870 *(p++) = ' ';
1871 else
1872 first = false;
1873
1874 if (strpbrk(*a, WHITESPACE)) {
1875 *(p++) = '\'';
1876 p = stpcpy(p, *a);
1877 *(p++) = '\'';
1878 } else
1879 p = stpcpy(p, *a);
1880
1881 }
1882
9164977d
LP		 1883 *p = 0;
1884
44d8db9e
LP		 1885 /* FIXME: this doesn't really handle arguments that have
1886 * spaces and ticks in them */
1887
1888 return n;
1889}
1890
1891void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
9fb86720
LP		 1892 char *p2;
1893 const char *prefix2;
1894
44d8db9e
LP		 1895 char *cmd;
1896
1897 assert(c);
1898 assert(f);
1899
1900 if (!prefix)
1901 prefix = "";
9fb86720
LP		 1902 p2 = strappend(prefix, "\t");
1903 prefix2 = p2 ? p2 : prefix;
44d8db9e 1904
9e2f7c11 1905 cmd = exec_command_line(c->argv);
44d8db9e
LP		 1906
1907 fprintf(f,
1908 "%sCommand Line: %s\n",
1909 prefix, cmd ? cmd : strerror(ENOMEM));
1910
1911 free(cmd);
9fb86720
LP		 1912
1913 exec_status_dump(&c->exec_status, f, prefix2);
1914
1915 free(p2);
44d8db9e
LP		 1916}
1917
1918void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
1919 assert(f);
1920
1921 if (!prefix)
1922 prefix = "";
1923
1924 LIST_FOREACH(command, c, c)
1925 exec_command_dump(c, f, prefix);
1926}
94f04347 1927
a6a80b4f
LP		 1928void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
1929 ExecCommand *end;
1930
1931 assert(l);
1932 assert(e);
1933
1934 if (*l) {
35b8ca3a 1935 /* It's kind of important, that we keep the order here */
a6a80b4f
LP		 1936 LIST_FIND_TAIL(ExecCommand, command, *l, end);
1937 LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
1938 } else
1939 *l = e;
1940}
1941
26fd040d
LP		 1942int exec_command_set(ExecCommand *c, const char *path, ...) {
1943 va_list ap;
1944 char **l, *p;
1945
1946 assert(c);
1947 assert(path);
1948
1949 va_start(ap, path);
1950 l = strv_new_ap(path, ap);
1951 va_end(ap);
1952
1953 if (!l)
1954 return -ENOMEM;
1955
1956 if (!(p = strdup(path))) {
1957 strv_free(l);
1958 return -ENOMEM;
1959 }
1960
1961 free(c->path);
1962 c->path = p;
1963
1964 strv_free(c->argv);
1965 c->argv = l;
1966
1967 return 0;
1968}
1969
80876c20
LP		 1970static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
1971 [EXEC_INPUT_NULL] = "null",
1972 [EXEC_INPUT_TTY] = "tty",
1973 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 1974 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
1975 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 1976};
1977
8a0867d6
LP		 1978DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
1979
94f04347 1980static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 1981 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 1982 [EXEC_OUTPUT_NULL] = "null",
80876c20 1983 [EXEC_OUTPUT_TTY] = "tty",
94f04347 1984 [EXEC_OUTPUT_SYSLOG] = "syslog",
28dbc1e8 1985 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
9a6bca7a 1986 [EXEC_OUTPUT_KMSG] = "kmsg",
28dbc1e8 1987 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
4f2d528d 1988 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 1989};
1990
1991DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
1992
8a0867d6
LP		 1993static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1994 [KILL_CONTROL_GROUP] = "control-group",
8a0867d6
LP		 1995 [KILL_PROCESS] = "process",
1996 [KILL_NONE] = "none"
1997};
1998
1999DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);
2000
2001static const char* const kill_who_table[_KILL_WHO_MAX] = {
2002 [KILL_MAIN] = "main",
2003 [KILL_CONTROL] = "control",
2004 [KILL_ALL] = "all"
2005};
2006
2007DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);
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