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