/* Test of execute.
   Copyright (C) 2020-2021 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

#include "execute.h"

#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>

#if defined _WIN32 && ! defined __CYGWIN__
/* Get _isatty, _getcwd.  */
# include <io.h>
#endif

#include "read-file.h"
#include "macros.h"

/* The name of the "always silent" device.  */
#if defined _WIN32 && ! defined __CYGWIN__
/* Native Windows API.  */
# define DEV_NULL "NUL"
#else
/* Unix API.  */
# define DEV_NULL "/dev/null"
#endif

#define BASE "test-execute"

int
main (int argc, char *argv[])
{
  if (argc != 3)
    {
      fprintf (stderr, "%s: need 2 arguments\n", argv[0]);
      return 2;
    }
  char *prog_path = argv[1];
  const char *progname = "test-execute-child";
  int test = atoi (argv[2]);
  switch (test)
    {
    case 0:
      {
        /* Check an invocation without arguments.  Check the exit code.  */
        const char *prog_argv[2] = { prog_path, NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 40);
      }
      break;
    case 1:
      {
        /* Check an invocation of a non-existent program.  */
        const char *prog_argv[3] = { "./non-existent", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 127);
      }
      break;
    case 2:
      {
        /* Check argument passing.  */
        const char *prog_argv[13] =
          {
            prog_path,
            "2",
            "abc def",
            "abc\"def\"ghi",
            "xyz\"",
            "abc\\def\\ghi",
            "xyz\\",
            "???",
            "***",
            "",
            "foo",
            "",
            NULL
          };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);
      }
      break;
    case 3:
      #if !(defined _WIN32 && !defined __CYGWIN__)
      {
        /* Check SIGPIPE handling with ignore_sigpipe = false.  */
        const char *prog_argv[3] = { prog_path, "3", NULL };
        int termsig = 0xDEADBEEF;
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, &termsig);
        ASSERT (ret == 127);
        ASSERT (termsig == SIGPIPE);
      }
      #endif
      break;
    case 4:
      #if !(defined _WIN32 && !defined __CYGWIN__)
      {
        /* Check SIGPIPE handling with ignore_sigpipe = true.  */
        const char *prog_argv[3] = { prog_path, "4", NULL };
        int termsig = 0xDEADBEEF;
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           true, false, false, false, true, false, &termsig);
        ASSERT (ret == 0);
        ASSERT (termsig == SIGPIPE);
      }
      #endif
      break;
    case 5:
      {
        /* Check other signal.  */
        const char *prog_argv[3] = { prog_path, "5", NULL };
        int termsig = 0xDEADBEEF;
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, &termsig);
        ASSERT (ret == 127);
        #if defined _WIN32 && !defined __CYGWIN__
        ASSERT (termsig == SIGTERM); /* dummy, from WTERMSIG in <sys/wait.h> */
        #else
        ASSERT (termsig == SIGINT);
        #endif
      }
      break;
    case 6:
      {
        /* Check stdin is inherited.  */
        FILE *fp = fopen (BASE ".tmp", "w");
        fputs ("Foo", fp);
        ASSERT (fclose (fp) == 0);

        fp = freopen (BASE ".tmp", "r", stdin);
        ASSERT (fp != NULL);

        const char *prog_argv[3] = { prog_path, "6", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);

        ASSERT (fclose (stdin) == 0);
        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 7:
      {
        /* Check null_stdin = true.  */
        FILE *fp = fopen (BASE ".tmp", "w");
        fputs ("Foo", fp);
        ASSERT (fclose (fp) == 0);

        fp = freopen (BASE ".tmp", "r", stdin);
        ASSERT (fp != NULL);

        const char *prog_argv[3] = { prog_path, "7", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, true, false, false, true, false, NULL);
        ASSERT (ret == 0);

        ASSERT (fclose (stdin) == 0);
        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 8:
      {
        /* Check stdout is inherited, part 1 (regular file).  */
        FILE *fp = freopen (BASE ".tmp", "w", stdout);
        ASSERT (fp != NULL);

        const char *prog_argv[3] = { prog_path, "8", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);

        ASSERT (fclose (stdout) == 0);

        size_t length;
        char *contents = read_file (BASE ".tmp", 0, &length);
        ASSERT (length == 3 && memcmp (contents, "bar", 3) == 0);

        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 9:
      {
        /* Check stdout is inherited, part 2 (device).  */
        FILE *fp = freopen (DEV_NULL, "w", stdout);
        ASSERT (fp != NULL);

        const char *prog_argv[3] = { prog_path, "9", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);
      }
      break;
    case 10:
      {
        /* Check null_stdout = true.  */
        FILE *fp = freopen (BASE ".tmp", "w", stdout);
        ASSERT (fp != NULL);

        const char *prog_argv[3] = { prog_path, "10", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, true, false, true, false, NULL);
        ASSERT (ret == 0);

        ASSERT (fclose (stdout) == 0);

        size_t length;
        (void) read_file (BASE ".tmp", 0, &length);
        ASSERT (length == 0);

        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 11:
      {
        /* Check stderr is inherited, part 1 (regular file).  */
        FILE *fp = freopen (BASE ".tmp", "w", stderr);
        ASSERT (fp != NULL);

        const char *prog_argv[3] = { prog_path, "11", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);

        ASSERT (fclose (stderr) == 0);

        size_t length;
        char *contents = read_file (BASE ".tmp", 0, &length);
        ASSERT (length == 3 && memcmp (contents, "bar", 3) == 0);

        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 12:
      {
        /* Check stderr is inherited, part 2 (device).  */
        FILE *fp = freopen (DEV_NULL, "w", stderr);
        ASSERT (fp != NULL);

        const char *prog_argv[3] = { prog_path, "12", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);
      }
      break;
    case 13:
      {
        /* Check null_stderr = true.  */
        FILE *fp = freopen (BASE ".tmp", "w", stderr);
        ASSERT (fp != NULL);

        const char *prog_argv[3] = { prog_path, "13", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, true, true, false, NULL);
        ASSERT (ret == 0);

        ASSERT (fclose (stderr) == 0);

        size_t length;
        (void) read_file (BASE ".tmp", 0, &length);
        ASSERT (length == 0);

        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 14:
      {
        /* Check file descriptors >= 3 can be inherited.  */
        ASSERT (dup2 (STDOUT_FILENO, 10) >= 0);
        const char *prog_argv[3] = { prog_path, "14", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           true, false, false, false, true, false, NULL);
        ASSERT (ret == 0);
      }
      break;
    case 15:
      {
        /* Check file descriptors >= 3 can be inherited.  */
        ASSERT (fcntl (STDOUT_FILENO, F_DUPFD, 10) >= 0);
        const char *prog_argv[3] = { prog_path, "15", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           true, false, false, false, true, false, NULL);
        ASSERT (ret == 0);
      }
      break;
    case 16:
      {
        /* Check file descriptors >= 3 with O_CLOEXEC bit are not inherited.  */
        ASSERT (fcntl (STDOUT_FILENO, F_DUPFD_CLOEXEC, 10) >= 0);
        const char *prog_argv[3] = { prog_path, "16", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           true, false, false, false, true, false, NULL);
        ASSERT (ret == 0);
      }
      break;
    case 17:
      {
        /* Check that file descriptors >= 3, open for reading, can be inherited,
           including the file position.  */
        FILE *fp = fopen (BASE ".tmp", "w");
        fputs ("Foobar", fp);
        ASSERT (fclose (fp) == 0);

        int fd = open (BASE ".tmp", O_RDONLY);
        ASSERT (fd >= 0 && fd < 10);

        ASSERT (dup2 (fd, 10) >= 0);
        close (fd);
        fd = 10;

        char buf[2];
        ASSERT (read (fd, buf, sizeof (buf)) == sizeof (buf));
        /* The file position is now 2.  */

        const char *prog_argv[3] = { prog_path, "17", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);

        close (fd);
        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 18:
      {
        /* Check that file descriptors >= 3, open for writing, can be inherited,
           including the file position.  */
        remove (BASE ".tmp");
        int fd = open (BASE ".tmp", O_RDWR | O_CREAT | O_TRUNC, 0600);
        ASSERT (fd >= 0 && fd < 10);

        ASSERT (dup2 (fd, 10) >= 0);
        close (fd);
        fd = 10;

        ASSERT (write (fd, "Foo", 3) == 3);
        /* The file position is now 3.  */

        const char *prog_argv[3] = { prog_path, "18", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);

        close (fd);

        size_t length;
        char *contents = read_file (BASE ".tmp", 0, &length);
        ASSERT (length == 6 && memcmp (contents, "Foobar", 6) == 0);

        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 19:
      {
        /* Check that file descriptors >= 3, when inherited, preserve their
           isatty() property, part 1 (regular file).  */
        FILE *fp = fopen (BASE ".tmp", "w");
        fputs ("Foo", fp);
        ASSERT (fclose (fp) == 0);

        int fd_in = open (BASE ".tmp", O_RDONLY);
        ASSERT (fd_in >= 0 && fd_in < 10);

        int fd_out = open (BASE ".tmp", O_WRONLY | O_APPEND);
        ASSERT (fd_out >= 0 && fd_out < 10);

        ASSERT (dup2 (fd_in, 10) >= 0);
        close (fd_in);
        fd_in = 10;

        ASSERT (dup2 (fd_out, 11) >= 0);
        close (fd_out);
        fd_out = 11;

        const char *prog_argv[3] = { prog_path, "19", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        #if defined _WIN32 && ! defined __CYGWIN__
        ASSERT (ret == 4 + 2 * (_isatty (10) != 0) + (_isatty (11) != 0));
        #else
        ASSERT (ret == 4 + 2 * (isatty (10) != 0) + (isatty (11) != 0));
        #endif

        close (fd_in);
        close (fd_out);
        ASSERT (remove (BASE ".tmp") == 0);
      }
      break;
    case 20:
      {
        /* Check that file descriptors >= 3, when inherited, preserve their
           isatty() property, part 2 (character devices).  */
        ASSERT (dup2 (STDIN_FILENO, 10) >= 0);
        int fd_in = 10;

        ASSERT (dup2 (STDOUT_FILENO, 11) >= 0);
        int fd_out = 11;

        const char *prog_argv[3] = { prog_path, "20", NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, NULL,
                           false, false, false, false, true, false, NULL);
        #if defined _WIN32 && ! defined __CYGWIN__
        ASSERT (ret == 4 + 2 * (_isatty (10) != 0) + (_isatty (11) != 0));
        #else
        ASSERT (ret == 4 + 2 * (isatty (10) != 0) + (isatty (11) != 0));
        #endif

        close (fd_in);
        close (fd_out);
      }
      break;
    case 21:
      {
        /* Check execution in a different directory.  */
        rmdir (BASE ".sub");
        ASSERT (mkdir (BASE ".sub", 0700) == 0);

        char cwd[1024];
        #if defined _WIN32 && ! defined __CYGWIN__
        ASSERT (_getcwd (cwd, sizeof (cwd)) != NULL);
        #else
        ASSERT (getcwd (cwd, sizeof (cwd)) != NULL);
        #endif

        const char *prog_argv[4] = { prog_path, "21", cwd, NULL };
        int ret = execute (progname, prog_argv[0], prog_argv, BASE ".sub",
                           false, false, false, false, true, false, NULL);
        ASSERT (ret == 0);

        ASSERT (rmdir (BASE ".sub") == 0);
      }
      break;
    default:
      ASSERT (false);
    }
  return 0;
}