tests/test-streaming.c

   1 /* nbdkit
   2  * Copyright (C) 2014 Red Hat Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <config.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stdint.h>
  38 #include <inttypes.h>
  39 #include <string.h>
  40 #include <fcntl.h>
  41 #include <unistd.h>
  42 #include <sys/types.h>
  43 #include <sys/stat.h>
  44 #include <sys/wait.h>
  45
  46 #include <guestfs.h>
  47
  48 #include "test.h"
  49
  50 static char data[65536];
  51
  52 int
  53 main (int argc, char *argv[])
  54 {
  55   pid_t md5pid;
  56   guestfs_h *g;
  57   int r;
  58   size_t i;
  59   int pipefd[2];
  60   char md5[33];
  61   int status;
  62
  63   unlink ("streaming.fifo");
  64   if (mknod ("streaming.fifo", S_IFIFO | 0600, 0) == -1) {
  65     perror ("streaming.fifo");
  66     exit (EXIT_FAILURE);
  67   }
  68
  69   if (test_start_nbdkit ("streaming", "pipe=streaming.fifo", "size=640k",
  70                          NULL) == -1)
  71     exit (EXIT_FAILURE);
  72
  73   /* Fork to run a second process which reads from streaming.fifo and
  74    * checks that the content is correct.  The test doesn't care about
  75    * fd leaks, so we don't bother with CLOEXEC.
  76    */
  77   if (pipe (pipefd) == -1) {
  78     perror ("pipe");
  79     exit (EXIT_FAILURE);
  80   }
  81
  82   md5pid = fork ();
  83   if (md5pid == -1) {
  84     perror ("fork");
  85     exit (EXIT_FAILURE);
  86   }
  87
  88   if (md5pid == 0) {
  89     /* Child: run md5sum on the pipe. */
  90     char *argv[] = { "md5sum", NULL };
  91
  92     close (0);
  93     open ("streaming.fifo", O_RDONLY);
  94     close (1);
  95     dup2 (pipefd[1], 1);
  96     close (pipefd[0]);
  97
  98     execvp ("md5sum", argv);
  99     perror ("md5sum");
 100     _exit (EXIT_FAILURE);
 101   }
 102
 103   close (pipefd[1]);
 104
 105   g = guestfs_create ();
 106   if (g == NULL) {
 107     perror ("guestfs_create");
 108     exit (EXIT_FAILURE);
 109   }
 110
 111   r = guestfs_add_drive_opts (g, "",
 112                               GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
 113                               GUESTFS_ADD_DRIVE_OPTS_PROTOCOL, "nbd",
 114                               GUESTFS_ADD_DRIVE_OPTS_SERVER, server,
 115                               -1);
 116   if (r == -1)
 117     exit (EXIT_FAILURE);
 118
 119   if (guestfs_launch (g) == -1)
 120     exit (EXIT_FAILURE);
 121
 122   /* Write linearly to the virtual disk. */
 123   memset (data, 1, sizeof data);
 124   for (i = 0; i < 10; ++i) {
 125     guestfs_pwrite_device (g, "/dev/sda", data, sizeof data,
 126                            i * sizeof data);
 127   }
 128
 129   if (guestfs_shutdown (g) == -1)
 130     exit (EXIT_FAILURE);
 131
 132   guestfs_close (g);
 133
 134   /* We have to explicitly kill nbdkit here so that it closes the
 135    * pipe.
 136    */
 137   kill (pid, SIGINT);
 138
 139   /* Check the hash computed by the child process. */
 140   if (read (pipefd[0], md5, 32) != 32) {
 141     perror ("read");
 142     exit (EXIT_FAILURE);
 143   }
 144   md5[32] = '\0';
 145
 146   if (strcmp (md5, "2c7f81c580f7f9eb52c1bd2f6f493b6f") != 0) {
 147     fprintf (stderr, "unexpected hash: %s\n", md5);
 148     exit (EXIT_FAILURE);
 149   }
 150
 151   if (waitpid (md5pid, &status, 0) == -1) {
 152     perror ("waitpid");
 153     exit (EXIT_FAILURE);
 154   }
 155   if (status != 0) {
 156     fprintf (stderr, "md5sum subprocess failed\n");
 157     exit (EXIT_FAILURE);
 158   }
 159
 160   exit (EXIT_SUCCESS);
 161 }