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