src/test/test-fd-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <fcntl.h>
   4 #include <unistd.h>
   5
   6 #include "alloc-util.h"
   7 #include "fd-util.h"
   8 #include "fileio.h"
   9 #include "macro.h"
  10 #include "path-util.h"
  11 #include "process-util.h"
  12 #include "random-util.h"
  13 #include "serialize.h"
  14 #include "string-util.h"
  15 #include "tests.h"
  16 #include "tmpfile-util.h"
  17 #include "util.h"
  18
  19 static void test_close_many(void) {
  20         int fds[3];
  21         char name0[] = "/tmp/test-close-many.XXXXXX";
  22         char name1[] = "/tmp/test-close-many.XXXXXX";
  23         char name2[] = "/tmp/test-close-many.XXXXXX";
  24
  25         fds[0] = mkostemp_safe(name0);
  26         fds[1] = mkostemp_safe(name1);
  27         fds[2] = mkostemp_safe(name2);
  28
  29         close_many(fds, 2);
  30
  31         assert_se(fcntl(fds[0], F_GETFD) == -1);
  32         assert_se(fcntl(fds[1], F_GETFD) == -1);
  33         assert_se(fcntl(fds[2], F_GETFD) >= 0);
  34
  35         safe_close(fds[2]);
  36
  37         unlink(name0);
  38         unlink(name1);
  39         unlink(name2);
  40 }
  41
  42 static void test_close_nointr(void) {
  43         char name[] = "/tmp/test-test-close_nointr.XXXXXX";
  44         int fd;
  45
  46         fd = mkostemp_safe(name);
  47         assert_se(fd >= 0);
  48         assert_se(close_nointr(fd) >= 0);
  49         assert_se(close_nointr(fd) < 0);
  50
  51         unlink(name);
  52 }
  53
  54 static void test_same_fd(void) {
  55         _cleanup_close_pair_ int p[2] = { -1, -1 };
  56         _cleanup_close_ int a = -1, b = -1, c = -1;
  57
  58         assert_se(pipe2(p, O_CLOEXEC) >= 0);
  59         assert_se((a = fcntl(p[0], F_DUPFD, 3)) >= 0);
  60         assert_se((b = open("/dev/null", O_RDONLY|O_CLOEXEC)) >= 0);
  61         assert_se((c = fcntl(a, F_DUPFD, 3)) >= 0);
  62
  63         assert_se(same_fd(p[0], p[0]) > 0);
  64         assert_se(same_fd(p[1], p[1]) > 0);
  65         assert_se(same_fd(a, a) > 0);
  66         assert_se(same_fd(b, b) > 0);
  67
  68         assert_se(same_fd(a, p[0]) > 0);
  69         assert_se(same_fd(p[0], a) > 0);
  70         assert_se(same_fd(c, p[0]) > 0);
  71         assert_se(same_fd(p[0], c) > 0);
  72         assert_se(same_fd(a, c) > 0);
  73         assert_se(same_fd(c, a) > 0);
  74
  75         assert_se(same_fd(p[0], p[1]) == 0);
  76         assert_se(same_fd(p[1], p[0]) == 0);
  77         assert_se(same_fd(p[0], b) == 0);
  78         assert_se(same_fd(b, p[0]) == 0);
  79         assert_se(same_fd(p[1], a) == 0);
  80         assert_se(same_fd(a, p[1]) == 0);
  81         assert_se(same_fd(p[1], b) == 0);
  82         assert_se(same_fd(b, p[1]) == 0);
  83
  84         assert_se(same_fd(a, b) == 0);
  85         assert_se(same_fd(b, a) == 0);
  86 }
  87
  88 static void test_open_serialization_fd(void) {
  89         _cleanup_close_ int fd = -1;
  90
  91         fd = open_serialization_fd("test");
  92         assert_se(fd >= 0);
  93
  94         assert_se(write(fd, "test\n", 5) == 5);
  95 }
  96
  97 static void test_acquire_data_fd_one(unsigned flags) {
  98         char wbuffer[196*1024 - 7];
  99         char rbuffer[sizeof(wbuffer)];
 100         int fd;
 101
 102         fd = acquire_data_fd("foo", 3, flags);
 103         assert_se(fd >= 0);
 104
 105         zero(rbuffer);
 106         assert_se(read(fd, rbuffer, sizeof(rbuffer)) == 3);
 107         assert_se(streq(rbuffer, "foo"));
 108
 109         fd = safe_close(fd);
 110
 111         fd = acquire_data_fd("", 0, flags);
 112         assert_se(fd >= 0);
 113
 114         zero(rbuffer);
 115         assert_se(read(fd, rbuffer, sizeof(rbuffer)) == 0);
 116         assert_se(streq(rbuffer, ""));
 117
 118         fd = safe_close(fd);
 119
 120         random_bytes(wbuffer, sizeof(wbuffer));
 121
 122         fd = acquire_data_fd(wbuffer, sizeof(wbuffer), flags);
 123         assert_se(fd >= 0);
 124
 125         zero(rbuffer);
 126         assert_se(read(fd, rbuffer, sizeof(rbuffer)) == sizeof(rbuffer));
 127         assert_se(memcmp(rbuffer, wbuffer, sizeof(rbuffer)) == 0);
 128
 129         fd = safe_close(fd);
 130 }
 131
 132 static void test_acquire_data_fd(void) {
 133
 134         test_acquire_data_fd_one(0);
 135         test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL);
 136         test_acquire_data_fd_one(ACQUIRE_NO_MEMFD);
 137         test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD);
 138         test_acquire_data_fd_one(ACQUIRE_NO_PIPE);
 139         test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_PIPE);
 140         test_acquire_data_fd_one(ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE);
 141         test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE);
 142         test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE|ACQUIRE_NO_TMPFILE);
 143 }
 144
 145 static void test_fd_move_above_stdio(void) {
 146         int original_stdin, new_fd;
 147
 148         original_stdin = fcntl(0, F_DUPFD, 3);
 149         assert_se(original_stdin >= 3);
 150         assert_se(close_nointr(0) != EBADF);
 151
 152         new_fd = open("/dev/null", O_RDONLY);
 153         assert_se(new_fd == 0);
 154
 155         new_fd = fd_move_above_stdio(new_fd);
 156         assert_se(new_fd >= 3);
 157
 158         assert_se(dup(original_stdin) == 0);
 159         assert_se(close_nointr(original_stdin) != EBADF);
 160         assert_se(close_nointr(new_fd) != EBADF);
 161 }
 162
 163 static void test_rearrange_stdio(void) {
 164         pid_t pid;
 165         int r;
 166
 167         r = safe_fork("rearrange", FORK_WAIT|FORK_LOG, &pid);
 168         assert_se(r >= 0);
 169
 170         if (r == 0) {
 171                 _cleanup_free_ char *path = NULL;
 172                 char buffer[10];
 173
 174                 /* Child */
 175
 176                 safe_close(STDERR_FILENO); /* Let's close an fd < 2, to make it more interesting */
 177
 178                 assert_se(rearrange_stdio(-1, -1, -1) >= 0);
 179
 180                 assert_se(fd_get_path(STDIN_FILENO, &path) >= 0);
 181                 assert_se(path_equal(path, "/dev/null"));
 182                 path = mfree(path);
 183
 184                 assert_se(fd_get_path(STDOUT_FILENO, &path) >= 0);
 185                 assert_se(path_equal(path, "/dev/null"));
 186                 path = mfree(path);
 187
 188                 assert_se(fd_get_path(STDOUT_FILENO, &path) >= 0);
 189                 assert_se(path_equal(path, "/dev/null"));
 190                 path = mfree(path);
 191
 192                 safe_close(STDIN_FILENO);
 193                 safe_close(STDOUT_FILENO);
 194                 safe_close(STDERR_FILENO);
 195
 196                 {
 197                         int pair[2];
 198                         assert_se(pipe(pair) >= 0);
 199                         assert_se(pair[0] == 0);
 200                         assert_se(pair[1] == 1);
 201                         assert_se(fd_move_above_stdio(0) == 3);
 202                 }
 203                 assert_se(open("/dev/full", O_WRONLY|O_CLOEXEC) == 0);
 204                 assert_se(acquire_data_fd("foobar", 6, 0) == 2);
 205
 206                 assert_se(rearrange_stdio(2, 0, 1) >= 0);
 207
 208                 assert_se(write(1, "x", 1) < 0 && errno == ENOSPC);
 209                 assert_se(write(2, "z", 1) == 1);
 210                 assert_se(read(3, buffer, sizeof(buffer)) == 1);
 211                 assert_se(buffer[0] == 'z');
 212                 assert_se(read(0, buffer, sizeof(buffer)) == 6);
 213                 assert_se(memcmp(buffer, "foobar", 6) == 0);
 214
 215                 assert_se(rearrange_stdio(-1, 1, 2) >= 0);
 216                 assert_se(write(1, "a", 1) < 0 && errno == ENOSPC);
 217                 assert_se(write(2, "y", 1) == 1);
 218                 assert_se(read(3, buffer, sizeof(buffer)) == 1);
 219                 assert_se(buffer[0] == 'y');
 220
 221                 assert_se(fd_get_path(0, &path) >= 0);
 222                 assert_se(path_equal(path, "/dev/null"));
 223                 path = mfree(path);
 224
 225                 _exit(EXIT_SUCCESS);
 226         }
 227 }
 228
 229 static void assert_equal_fd(int fd1, int fd2) {
 230
 231         for (;;) {
 232                 uint8_t a[4096], b[4096];
 233                 ssize_t x, y;
 234
 235                 x = read(fd1, a, sizeof(a));
 236                 assert(x >= 0);
 237
 238                 y = read(fd2, b, sizeof(b));
 239                 assert(y >= 0);
 240
 241                 assert(x == y);
 242
 243                 if (x == 0)
 244                         break;
 245
 246                 assert(memcmp(a, b, x) == 0);
 247         }
 248 }
 249
 250 static void test_fd_duplicate_data_fd(void) {
 251         _cleanup_close_ int fd1 = -1, fd2 = -1;
 252         _cleanup_(close_pairp) int sfd[2] = { -1, -1 };
 253         _cleanup_(sigkill_waitp) pid_t pid = -1;
 254         uint64_t i, j;
 255         int r;
 256
 257         fd1 = open("/etc/fstab", O_RDONLY|O_CLOEXEC);
 258         if (fd1 >= 0) {
 259
 260                 fd2 = fd_duplicate_data_fd(fd1);
 261                 assert_se(fd2 >= 0);
 262
 263                 assert_se(lseek(fd1, 0, SEEK_SET) == 0);
 264                 assert_equal_fd(fd1, fd2);
 265         }
 266
 267         fd1 = safe_close(fd1);
 268         fd2 = safe_close(fd2);
 269
 270         fd1 = acquire_data_fd("hallo", 6,  0);
 271         assert_se(fd1 >= 0);
 272
 273         fd2 = fd_duplicate_data_fd(fd1);
 274         assert_se(fd2 >= 0);
 275
 276         safe_close(fd1);
 277         fd1 = acquire_data_fd("hallo", 6,  0);
 278         assert_se(fd1 >= 0);
 279
 280         assert_equal_fd(fd1, fd2);
 281
 282         fd1 = safe_close(fd1);
 283         fd2 = safe_close(fd2);
 284
 285         assert_se(socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, sfd) >= 0);
 286
 287         r = safe_fork("(sd-pipe)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
 288         assert_se(r >= 0);
 289
 290         if (r == 0) {
 291                 /* child */
 292
 293                 sfd[0] = safe_close(sfd[0]);
 294
 295                 for (i = 0; i < 1536*1024 / sizeof(uint64_t); i++)
 296                         assert_se(write(sfd[1], &i, sizeof(i)) == sizeof(i));
 297
 298                 sfd[1] = safe_close(sfd[1]);
 299
 300                 _exit(EXIT_SUCCESS);
 301         }
 302
 303         sfd[1] = safe_close(sfd[1]);
 304
 305         fd2 = fd_duplicate_data_fd(sfd[0]);
 306         assert_se(fd2 >= 0);
 307
 308         for (i = 0; i < 1536*1024 / sizeof(uint64_t); i++) {
 309                 assert_se(read(fd2, &j, sizeof(j)) == sizeof(j));
 310                 assert_se(i == j);
 311         }
 312
 313         assert_se(read(fd2, &j, sizeof(j)) == 0);
 314 }
 315
 316 static void test_read_nr_open(void) {
 317         log_info("nr-open: %i", read_nr_open());
 318 }
 319
 320 int main(int argc, char *argv[]) {
 321
 322         test_setup_logging(LOG_DEBUG);
 323
 324         test_close_many();
 325         test_close_nointr();
 326         test_same_fd();
 327         test_open_serialization_fd();
 328         test_acquire_data_fd();
 329         test_fd_move_above_stdio();
 330         test_rearrange_stdio();
 331         test_fd_duplicate_data_fd();
 332         test_read_nr_open();
 333
 334         return 0;
 335 }