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