src/test/test-socket-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <fcntl.h>
   4 #include <grp.h>
   5 #include <net/if_arp.h>
   6 #include <sys/stat.h>
   7 #include <sys/types.h>
   8 #include <unistd.h>
   9
  10 #include "alloc-util.h"
  11 #include "async.h"
  12 #include "escape.h"
  13 #include "exit-status.h"
  14 #include "fd-util.h"
  15 #include "fs-util.h"
  16 #include "in-addr-util.h"
  17 #include "iovec-util.h"
  18 #include "log.h"
  19 #include "macro.h"
  20 #include "path-util.h"
  21 #include "process-util.h"
  22 #include "random-util.h"
  23 #include "rm-rf.h"
  24 #include "socket-util.h"
  25 #include "string-util.h"
  26 #include "tests.h"
  27 #include "tmpfile-util.h"
  28
  29 assert_cc(SUN_PATH_LEN == 108);
  30
  31 TEST(ifname_valid) {
  32         assert_se( ifname_valid("foo"));
  33         assert_se( ifname_valid("eth0"));
  34
  35         assert_se(!ifname_valid("0"));
  36         assert_se(!ifname_valid("99"));
  37         assert_se( ifname_valid("a99"));
  38         assert_se( ifname_valid("99a"));
  39
  40         assert_se(!ifname_valid(NULL));
  41         assert_se(!ifname_valid(""));
  42         assert_se(!ifname_valid(" "));
  43         assert_se(!ifname_valid(" foo"));
  44         assert_se(!ifname_valid("bar\n"));
  45         assert_se(!ifname_valid("."));
  46         assert_se(!ifname_valid(".."));
  47         assert_se(ifname_valid("foo.bar"));
  48         assert_se(!ifname_valid("x:y"));
  49
  50         assert_se( ifname_valid_full("xxxxxxxxxxxxxxx", 0));
  51         assert_se(!ifname_valid_full("xxxxxxxxxxxxxxxx", 0));
  52         assert_se( ifname_valid_full("xxxxxxxxxxxxxxxx", IFNAME_VALID_ALTERNATIVE));
  53         assert_se( ifname_valid_full("xxxxxxxxxxxxxxxx", IFNAME_VALID_ALTERNATIVE));
  54         assert_se(!ifname_valid_full("999", IFNAME_VALID_ALTERNATIVE));
  55         assert_se( ifname_valid_full("999", IFNAME_VALID_ALTERNATIVE | IFNAME_VALID_NUMERIC));
  56         assert_se(!ifname_valid_full("0", IFNAME_VALID_ALTERNATIVE | IFNAME_VALID_NUMERIC));
  57 }
  58
  59 static void test_socket_print_unix_one(const char *in, size_t len_in, const char *expected) {
  60         _cleanup_free_ char *out = NULL, *c = NULL;
  61
  62         assert_se(len_in <= SUN_PATH_LEN);
  63         SocketAddress a = { .sockaddr = { .un = { .sun_family = AF_UNIX } },
  64                             .size = offsetof(struct sockaddr_un, sun_path) + len_in,
  65                             .type = SOCK_STREAM,
  66         };
  67         memcpy(a.sockaddr.un.sun_path, in, len_in);
  68
  69         assert_se(socket_address_print(&a, &out) >= 0);
  70         assert_se(c = cescape(in));
  71         log_info("\"%s\" → \"%s\" (expect \"%s\")", in, out, expected);
  72         ASSERT_STREQ(out, expected);
  73 }
  74
  75 TEST(socket_print_unix) {
  76         /* Some additional tests for abstract addresses which we don't parse */
  77
  78         test_socket_print_unix_one("\0\0\0\0", 4, "@\\000\\000\\000");
  79         test_socket_print_unix_one("@abs", 5, "@abs");
  80         test_socket_print_unix_one("\n", 2, "\\n");
  81         test_socket_print_unix_one("", 1, "<unnamed>");
  82         test_socket_print_unix_one("\0", 1, "<unnamed>");
  83         test_socket_print_unix_one("\0_________________________there's 108 characters in this string_____________________________________________", 108,
  84                                    "@_________________________there\\'s 108 characters in this string_____________________________________________");
  85         test_socket_print_unix_one("////////////////////////////////////////////////////////////////////////////////////////////////////////////", 108,
  86                                    "////////////////////////////////////////////////////////////////////////////////////////////////////////////");
  87         test_socket_print_unix_one("\0\a\b\n\255", 6, "@\\a\\b\\n\\255\\000");
  88 }
  89
  90 TEST(sockaddr_equal) {
  91         union sockaddr_union a = {
  92                 .in.sin_family = AF_INET,
  93                 .in.sin_port = 0,
  94                 .in.sin_addr.s_addr = htobe32(INADDR_ANY),
  95         };
  96         union sockaddr_union b = {
  97                 .in.sin_family = AF_INET,
  98                 .in.sin_port = 0,
  99                 .in.sin_addr.s_addr = htobe32(INADDR_ANY),
 100         };
 101         union sockaddr_union c = {
 102                 .in.sin_family = AF_INET,
 103                 .in.sin_port = 0,
 104                 .in.sin_addr.s_addr = htobe32(1234),
 105         };
 106         union sockaddr_union d = {
 107                 .in6.sin6_family = AF_INET6,
 108                 .in6.sin6_port = 0,
 109                 .in6.sin6_addr = IN6ADDR_ANY_INIT,
 110         };
 111         union sockaddr_union e = {
 112                 .vm.svm_family = AF_VSOCK,
 113                 .vm.svm_port = 0,
 114                 .vm.svm_cid = VMADDR_CID_ANY,
 115         };
 116
 117         assert_se(sockaddr_equal(&a, &a));
 118         assert_se(sockaddr_equal(&a, &b));
 119         assert_se(sockaddr_equal(&d, &d));
 120         assert_se(sockaddr_equal(&e, &e));
 121         assert_se(!sockaddr_equal(&a, &c));
 122         assert_se(!sockaddr_equal(&b, &c));
 123         assert_se(!sockaddr_equal(&a, &e));
 124 }
 125
 126 TEST(sockaddr_un_len) {
 127         static const struct sockaddr_un fs = {
 128                 .sun_family = AF_UNIX,
 129                 .sun_path = "/foo/bar/waldo",
 130         };
 131
 132         static const struct sockaddr_un abstract = {
 133                 .sun_family = AF_UNIX,
 134                 .sun_path = "\0foobar",
 135         };
 136
 137         assert_se(SOCKADDR_UN_LEN(fs) == offsetof(struct sockaddr_un, sun_path) + strlen(fs.sun_path) + 1);
 138         assert_se(SOCKADDR_UN_LEN(abstract) == offsetof(struct sockaddr_un, sun_path) + 1 + strlen(abstract.sun_path + 1));
 139 }
 140
 141 TEST(in_addr_is_multicast) {
 142         union in_addr_union a, b;
 143         int f;
 144
 145         assert_se(in_addr_from_string_auto("192.168.3.11", &f, &a) >= 0);
 146         assert_se(in_addr_is_multicast(f, &a) == 0);
 147
 148         assert_se(in_addr_from_string_auto("224.0.0.1", &f, &a) >= 0);
 149         assert_se(in_addr_is_multicast(f, &a) == 1);
 150
 151         assert_se(in_addr_from_string_auto("FF01:0:0:0:0:0:0:1", &f, &b) >= 0);
 152         assert_se(in_addr_is_multicast(f, &b) == 1);
 153
 154         assert_se(in_addr_from_string_auto("2001:db8::c:69b:aeff:fe53:743e", &f, &b) >= 0);
 155         assert_se(in_addr_is_multicast(f, &b) == 0);
 156 }
 157
 158 TEST(getpeercred_getpeergroups) {
 159         int r;
 160
 161         r = safe_fork("(getpeercred)", FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT, NULL);
 162         assert_se(r >= 0);
 163
 164         if (r == 0) {
 165                 static const gid_t gids[] = { 3, 4, 5, 6, 7 };
 166                 gid_t *test_gids;
 167                 size_t n_test_gids;
 168                 uid_t test_uid;
 169                 gid_t test_gid;
 170                 struct ucred ucred;
 171                 int pair[2] = EBADF_PAIR;
 172
 173                 if (geteuid() == 0) {
 174                         test_uid = 1;
 175                         test_gid = 2;
 176                         test_gids = (gid_t*) gids;
 177                         n_test_gids = ELEMENTSOF(gids);
 178
 179                         assert_se(fully_set_uid_gid(test_uid, test_gid, test_gids, n_test_gids) >= 0);
 180                 } else {
 181                         long ngroups_max;
 182
 183                         test_uid = getuid();
 184                         test_gid = getgid();
 185
 186                         ngroups_max = sysconf(_SC_NGROUPS_MAX);
 187                         assert_se(ngroups_max > 0);
 188
 189                         test_gids = newa(gid_t, ngroups_max);
 190
 191                         r = getgroups(ngroups_max, test_gids);
 192                         assert_se(r >= 0);
 193                         n_test_gids = (size_t) r;
 194                 }
 195
 196                 assert_se(socketpair(AF_UNIX, SOCK_STREAM, 0, pair) >= 0);
 197
 198                 assert_se(getpeercred(pair[0], &ucred) >= 0);
 199
 200                 assert_se(ucred.uid == test_uid);
 201                 assert_se(ucred.gid == test_gid);
 202                 assert_se(ucred.pid == getpid_cached());
 203
 204                 {
 205                         _cleanup_free_ gid_t *peer_groups = NULL;
 206
 207                         r = getpeergroups(pair[0], &peer_groups);
 208                         assert_se(r >= 0 || IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT));
 209
 210                         if (r >= 0) {
 211                                 assert_se((size_t) r == n_test_gids);
 212                                 assert_se(memcmp(peer_groups, test_gids, sizeof(gid_t) * n_test_gids) == 0);
 213                         }
 214                 }
 215
 216                 safe_close_pair(pair);
 217                 _exit(EXIT_SUCCESS);
 218         }
 219 }
 220
 221 TEST(passfd_read) {
 222         static const char file_contents[] = "test contents for passfd";
 223         _cleanup_close_pair_ int pair[2] = EBADF_PAIR;
 224         int r;
 225
 226         assert_se(socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) >= 0);
 227
 228         r = safe_fork("(passfd_read)", FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT, NULL);
 229         assert_se(r >= 0);
 230
 231         if (r == 0) {
 232                 /* Child */
 233                 pair[0] = safe_close(pair[0]);
 234
 235                 char tmpfile[] = "/tmp/test-socket-util-passfd-read-XXXXXX";
 236                 assert_se(write_tmpfile(tmpfile, file_contents) == 0);
 237
 238                 _cleanup_close_ int tmpfd = open(tmpfile, O_RDONLY);
 239                 assert_se(tmpfd >= 0);
 240                 assert_se(unlink(tmpfile) == 0);
 241
 242                 assert_se(send_one_fd(pair[1], tmpfd, MSG_DONTWAIT) == 0);
 243                 _exit(EXIT_SUCCESS);
 244         }
 245
 246         /* Parent */
 247         char buf[64];
 248         struct iovec iov = IOVEC_MAKE(buf, sizeof(buf)-1);
 249         _cleanup_close_ int fd = -EBADF;
 250
 251         pair[1] = safe_close(pair[1]);
 252
 253         assert_se(receive_one_fd_iov(pair[0], &iov, 1, MSG_DONTWAIT, &fd) == 0);
 254
 255         assert_se(fd >= 0);
 256         r = read(fd, buf, sizeof(buf)-1);
 257         assert_se(r >= 0);
 258         buf[r] = 0;
 259         ASSERT_STREQ(buf, file_contents);
 260 }
 261
 262 TEST(passfd_contents_read) {
 263         _cleanup_close_pair_ int pair[2] = EBADF_PAIR;
 264         static const char file_contents[] = "test contents in the file";
 265         static const char wire_contents[] = "test contents on the wire";
 266         int r;
 267
 268         assert_se(socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) >= 0);
 269
 270         r = safe_fork("(passfd_contents_read)", FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT, NULL);
 271         assert_se(r >= 0);
 272
 273         if (r == 0) {
 274                 /* Child */
 275                 struct iovec iov = IOVEC_MAKE_STRING(wire_contents);
 276                 char tmpfile[] = "/tmp/test-socket-util-passfd-contents-read-XXXXXX";
 277
 278                 pair[0] = safe_close(pair[0]);
 279
 280                 assert_se(write_tmpfile(tmpfile, file_contents) == 0);
 281
 282                 _cleanup_close_ int tmpfd = open(tmpfile, O_RDONLY);
 283                 assert_se(tmpfd >= 0);
 284                 assert_se(unlink(tmpfile) == 0);
 285
 286                 assert_se(send_one_fd_iov(pair[1], tmpfd, &iov, 1, MSG_DONTWAIT) > 0);
 287                 _exit(EXIT_SUCCESS);
 288         }
 289
 290         /* Parent */
 291         char buf[64];
 292         struct iovec iov = IOVEC_MAKE(buf, sizeof(buf)-1);
 293         _cleanup_close_ int fd;
 294         ssize_t k;
 295
 296         pair[1] = safe_close(pair[1]);
 297
 298         k = receive_one_fd_iov(pair[0], &iov, 1, MSG_DONTWAIT, &fd);
 299         assert_se(k > 0);
 300         buf[k] = 0;
 301         ASSERT_STREQ(buf, wire_contents);
 302
 303         assert_se(fd >= 0);
 304         r = read(fd, buf, sizeof(buf)-1);
 305         assert_se(r >= 0);
 306         buf[r] = 0;
 307         ASSERT_STREQ(buf, file_contents);
 308 }
 309
 310 TEST(pass_many_fds_contents_read) {
 311         _cleanup_close_pair_ int pair[2] = EBADF_PAIR;
 312         static const char file_contents[][STRLEN("test contents in the fileX") + 1] = {
 313                 "test contents in the file0",
 314                 "test contents in the file1",
 315                 "test contents in the file2"
 316         };
 317         static const char wire_contents[] = "test contents on the wire";
 318         int r;
 319
 320         assert_se(socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) >= 0);
 321
 322         r = safe_fork("(passfd_contents_read)", FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT, NULL);
 323         assert_se(r >= 0);
 324
 325         if (r == 0) {
 326                 /* Child */
 327                 struct iovec iov = IOVEC_MAKE_STRING(wire_contents);
 328                 char tmpfile[][STRLEN("/tmp/test-socket-util-passfd-contents-read-XXXXXX") + 1] = {
 329                         "/tmp/test-socket-util-passfd-contents-read-XXXXXX",
 330                         "/tmp/test-socket-util-passfd-contents-read-XXXXXX",
 331                         "/tmp/test-socket-util-passfd-contents-read-XXXXXX"
 332                 };
 333                 int tmpfds[3] = EBADF_TRIPLET;
 334
 335                 pair[0] = safe_close(pair[0]);
 336
 337                 for (size_t i = 0; i < 3; ++i) {
 338                         assert_se(write_tmpfile(tmpfile[i], file_contents[i]) == 0);
 339                         tmpfds[i] = open(tmpfile[i], O_RDONLY);
 340                         assert_se(tmpfds[i] >= 0);
 341                         assert_se(unlink(tmpfile[i]) == 0);
 342                 }
 343
 344                 assert_se(send_many_fds_iov(pair[1], tmpfds, 3, &iov, 1, MSG_DONTWAIT) > 0);
 345                 close_many(tmpfds, 3);
 346                 _exit(EXIT_SUCCESS);
 347         }
 348
 349         /* Parent */
 350         char buf[64];
 351         struct iovec iov = IOVEC_MAKE(buf, sizeof(buf)-1);
 352         _cleanup_free_ int *fds = NULL;
 353         size_t n_fds = 0;
 354         ssize_t k;
 355
 356         pair[1] = safe_close(pair[1]);
 357
 358         k = receive_many_fds_iov(pair[0], &iov, 1, &fds, &n_fds, MSG_DONTWAIT);
 359         assert_se(k > 0);
 360         buf[k] = 0;
 361         ASSERT_STREQ(buf, wire_contents);
 362
 363         assert_se(n_fds == 3);
 364
 365         for (size_t i = 0; i < 3; ++i) {
 366                 assert_se(fds[i] >= 0);
 367                 r = read(fds[i], buf, sizeof(buf)-1);
 368                 assert_se(r >= 0);
 369                 buf[r] = 0;
 370                 ASSERT_STREQ(buf, file_contents[i]);
 371                 safe_close(fds[i]);
 372         }
 373 }
 374
 375 TEST(receive_nopassfd) {
 376         _cleanup_close_pair_ int pair[2] = EBADF_PAIR;
 377         static const char wire_contents[] = "no fd passed here";
 378         int r;
 379
 380         assert_se(socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) >= 0);
 381
 382         r = safe_fork("(receive_nopassfd)", FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT, NULL);
 383         assert_se(r >= 0);
 384
 385         if (r == 0) {
 386                 /* Child */
 387                 struct iovec iov = IOVEC_MAKE_STRING(wire_contents);
 388
 389                 pair[0] = safe_close(pair[0]);
 390
 391                 assert_se(send_one_fd_iov(pair[1], -1, &iov, 1, MSG_DONTWAIT) > 0);
 392                 _exit(EXIT_SUCCESS);
 393         }
 394
 395         /* Parent */
 396         char buf[64];
 397         struct iovec iov = IOVEC_MAKE(buf, sizeof(buf)-1);
 398         int fd = -999;
 399         ssize_t k;
 400
 401         pair[1] = safe_close(pair[1]);
 402
 403         k = receive_one_fd_iov(pair[0], &iov, 1, MSG_DONTWAIT, &fd);
 404         assert_se(k > 0);
 405         buf[k] = 0;
 406         ASSERT_STREQ(buf, wire_contents);
 407
 408         /* no fd passed here, confirm it was reset */
 409         assert_se(fd == -EBADF);
 410 }
 411
 412 TEST(send_nodata_nofd) {
 413         _cleanup_close_pair_ int pair[2] = EBADF_PAIR;
 414         int r;
 415
 416         assert_se(socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) >= 0);
 417
 418         r = safe_fork("(send_nodata_nofd)", FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT, NULL);
 419         assert_se(r >= 0);
 420
 421         if (r == 0) {
 422                 /* Child */
 423                 pair[0] = safe_close(pair[0]);
 424
 425                 assert_se(send_one_fd_iov(pair[1], -1, NULL, 0, MSG_DONTWAIT) == -EINVAL);
 426                 _exit(EXIT_SUCCESS);
 427         }
 428
 429         /* Parent */
 430         char buf[64];
 431         struct iovec iov = IOVEC_MAKE(buf, sizeof(buf)-1);
 432         int fd = -999;
 433         ssize_t k;
 434
 435         pair[1] = safe_close(pair[1]);
 436
 437         k = receive_one_fd_iov(pair[0], &iov, 1, MSG_DONTWAIT, &fd);
 438         /* recvmsg() will return errno EAGAIN if nothing was sent */
 439         assert_se(k == -EAGAIN);
 440
 441         /* receive_one_fd_iov returned error, so confirm &fd wasn't touched */
 442         assert_se(fd == -999);
 443 }
 444
 445 TEST(send_emptydata) {
 446         _cleanup_close_pair_ int pair[2] = EBADF_PAIR;
 447         int r;
 448
 449         assert_se(socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) >= 0);
 450
 451         r = safe_fork("(send_emptydata)", FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT, NULL);
 452         assert_se(r >= 0);
 453
 454         if (r == 0) {
 455                 /* Child */
 456                 struct iovec iov = IOVEC_MAKE_STRING("");  /* zero-length iov */
 457                 assert_se(iov.iov_len == 0);
 458
 459                 pair[0] = safe_close(pair[0]);
 460
 461                 /* This will succeed, since iov is set. */
 462                 assert_se(send_one_fd_iov(pair[1], -1, &iov, 1, MSG_DONTWAIT) == 0);
 463                 _exit(EXIT_SUCCESS);
 464         }
 465
 466         /* Parent */
 467         char buf[64];
 468         struct iovec iov = IOVEC_MAKE(buf, sizeof(buf)-1);
 469         int fd = -999;
 470         ssize_t k;
 471
 472         pair[1] = safe_close(pair[1]);
 473
 474         k = receive_one_fd_iov(pair[0], &iov, 1, MSG_DONTWAIT, &fd);
 475         /* receive_one_fd_iov() returns -EIO if an fd is not found and no data was returned. */
 476         assert_se(k == -EIO);
 477
 478         /* receive_one_fd_iov returned error, so confirm &fd wasn't touched */
 479         assert_se(fd == -999);
 480 }
 481
 482 TEST(flush_accept) {
 483         _cleanup_close_ int listen_stream, listen_dgram, listen_seqpacket, connect_stream, connect_dgram, connect_seqpacket;
 484         static const union sockaddr_union sa = { .un.sun_family = AF_UNIX };
 485         union sockaddr_union lsa;
 486         socklen_t l;
 487
 488         listen_stream = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 489         assert_se(listen_stream >= 0);
 490
 491         listen_dgram = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 492         assert_se(listen_dgram >= 0);
 493
 494         listen_seqpacket = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 495         assert_se(listen_seqpacket >= 0);
 496
 497         assert_se(flush_accept(listen_stream) < 0);
 498         assert_se(flush_accept(listen_dgram) < 0);
 499         assert_se(flush_accept(listen_seqpacket) < 0);
 500
 501         assert_se(bind(listen_stream, &sa.sa, sizeof(sa_family_t)) >= 0);
 502         assert_se(bind(listen_dgram, &sa.sa, sizeof(sa_family_t)) >= 0);
 503         assert_se(bind(listen_seqpacket, &sa.sa, sizeof(sa_family_t)) >= 0);
 504
 505         assert_se(flush_accept(listen_stream) < 0);
 506         assert_se(flush_accept(listen_dgram) < 0);
 507         assert_se(flush_accept(listen_seqpacket) < 0);
 508
 509         assert_se(listen(listen_stream, SOMAXCONN_DELUXE) >= 0);
 510         assert_se(listen(listen_dgram, SOMAXCONN_DELUXE) < 0);
 511         assert_se(listen(listen_seqpacket, SOMAXCONN_DELUXE) >= 0);
 512
 513         assert_se(flush_accept(listen_stream) >= 0);
 514         assert_se(flush_accept(listen_dgram) < 0);
 515         assert_se(flush_accept(listen_seqpacket) >= 0);
 516
 517         connect_stream = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 518         assert_se(connect_stream >= 0);
 519
 520         connect_dgram = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 521         assert_se(connect_dgram >= 0);
 522
 523         connect_seqpacket = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 524         assert_se(connect_seqpacket >= 0);
 525
 526         l = sizeof(lsa);
 527         assert_se(getsockname(listen_stream, &lsa.sa, &l) >= 0);
 528         assert_se(connect(connect_stream, &lsa.sa, l) >= 0);
 529
 530         l = sizeof(lsa);
 531         assert_se(getsockname(listen_dgram, &lsa.sa, &l) >= 0);
 532         assert_se(connect(connect_dgram, &lsa.sa, l) >= 0);
 533
 534         l = sizeof(lsa);
 535         assert_se(getsockname(listen_seqpacket, &lsa.sa, &l) >= 0);
 536         assert_se(connect(connect_seqpacket, &lsa.sa, l) >= 0);
 537
 538         assert_se(flush_accept(listen_stream) >= 0);
 539         assert_se(flush_accept(listen_dgram) < 0);
 540         assert_se(flush_accept(listen_seqpacket) >= 0);
 541 }
 542
 543 TEST(ipv6_enabled) {
 544         log_info("IPv6 supported: %s", yes_no(socket_ipv6_is_supported()));
 545         log_info("IPv6 enabled: %s", yes_no(socket_ipv6_is_enabled()));
 546 }
 547
 548 TEST(sockaddr_un_set_path) {
 549         _cleanup_(rm_rf_physical_and_freep) char *t = NULL;
 550         _cleanup_(unlink_and_freep) char *sh = NULL;
 551         _cleanup_free_ char *j = NULL;
 552         union sockaddr_union sa;
 553         _cleanup_close_ int fd1, fd2, fd3;
 554
 555         assert_se(mkdtemp_malloc("/tmp/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaXXXXXX", &t) >= 0);
 556         assert_se(strlen(t) > SUN_PATH_LEN);
 557
 558         assert_se(j = path_join(t, "sock"));
 559         assert_se(sockaddr_un_set_path(&sa.un, j) == -ENAMETOOLONG); /* too long for AF_UNIX socket */
 560
 561         assert_se(asprintf(&sh, "/tmp/%" PRIx64, random_u64()) >= 0);
 562         assert_se(symlink(t, sh) >= 0); /* create temporary symlink, to access it anyway */
 563
 564         free(j);
 565         assert_se(j = path_join(sh, "sock"));
 566         assert_se(sockaddr_un_set_path(&sa.un, j) >= 0);
 567
 568         fd1 = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
 569         assert_se(fd1 >= 0);
 570         assert_se(bind(fd1, &sa.sa, SOCKADDR_LEN(sa)) >= 0);
 571         assert_se(listen(fd1, 1) >= 0);
 572
 573         sh = unlink_and_free(sh); /* remove temporary symlink */
 574
 575         fd2 = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
 576         assert_se(fd2 >= 0);
 577         assert_se(connect(fd2, &sa.sa, SOCKADDR_LEN(sa)) < 0);
 578         assert_se(errno == ENOENT); /* we removed the symlink, must fail */
 579
 580         free(j);
 581         assert_se(j = path_join(t, "sock"));
 582
 583         fd3 = open(j, O_CLOEXEC|O_PATH|O_NOFOLLOW);
 584         assert_se(fd3 > 0);
 585         assert_se(sockaddr_un_set_path(&sa.un, FORMAT_PROC_FD_PATH(fd3)) >= 0); /* connect via O_PATH instead, circumventing 108ch limit */
 586
 587         assert_se(connect(fd2, &sa.sa, SOCKADDR_LEN(sa)) >= 0);
 588 }
 589
 590 DEFINE_TEST_MAIN(LOG_DEBUG);