/* Test whether two files have the same ACLs.
   Copyright (C) 2008 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 of the License, 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 <http://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2008.  */

#include <config.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

#if HAVE_ACL_GET_FILE || HAVE_ACL || HAVE_ACLX_GET || HAVE_STATACL
# include <sys/types.h>
# include <sys/acl.h>
#endif

#include "progname.h"
#include "read-file.h"
#include "xalloc.h"

#define ASSERT(expr) \
  do									     \
    {									     \
      if (!(expr))							     \
        {								     \
          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
          fflush (stderr);						     \
          abort ();							     \
        }								     \
    }									     \
  while (0)

int
main (int argc, char *argv[])
{
  const char *file1;
  const char *file2;

  set_program_name (argv[0]);

  ASSERT (argc == 3);

  file1 = argv[1];
  file2 = argv[2];

  /* Compare the contents of the two files.  */
  {
    size_t size1;
    char *contents1;
    size_t size2;
    char *contents2;

    contents1 = read_file (file1, &size1);
    if (contents1 == NULL)
      {
	fprintf (stderr, "error reading file %s: errno = %d\n", file1, errno);
	fflush (stderr);
	abort ();
      }
    contents2 = read_file (file2, &size2);
    if (contents2 == NULL)
      {
	fprintf (stderr, "error reading file %s: errno = %d\n", file2, errno);
	fflush (stderr);
	abort ();
      }

    if (size2 != size1)
      {
	fprintf (stderr, "files %s and %s have different sizes\n",
		 file1, file2);
	fflush (stderr);
	abort ();
      }
    if (memcmp (contents1, contents2, size1) != 0)
      {
	fprintf (stderr, "files %s and %s have different contents\n",
		 file1, file2);
	fflush (stderr);
	abort ();
      }
  }

  /* Compare the access permissions of the two files, including ACLs.  */
  {
    struct stat statbuf1;
    struct stat statbuf2;

    if (stat (file1, &statbuf1) < 0)
      {
	fprintf (stderr, "error accessing file %s: errno = %d\n", file1, errno);
	fflush (stderr);
	abort ();
      }
    if (stat (file2, &statbuf2) < 0)
      {
	fprintf (stderr, "error accessing file %s: errno = %d\n", file2, errno);
	fflush (stderr);
	abort ();
      }
    if (statbuf1.st_mode != statbuf2.st_mode)
      {
	fprintf (stderr, "files %s and %s have different access modes: %03o and %03o\n",
		 file1, file2,
		(unsigned int) statbuf1.st_mode, (unsigned int) statbuf2.st_mode);
	return 1;
      }
  }
  {
#if HAVE_ACL_GET_FILE /* Linux, FreeBSD, MacOS X, IRIX, Tru64 */
    static const int types[] =
      {
	ACL_TYPE_ACCESS
# if HAVE_ACL_TYPE_EXTENDED /* MacOS X */
	, ACL_TYPE_EXTENDED
# endif
      };
    int t;

    for (t = 0; t < sizeof (types) / sizeof (types[0]); t++)
      {
	int type = types[t];
	acl_t acl1;
	char *text1;
	int errno1;
	acl_t acl2;
	char *text2;
	int errno2;

	acl1 = acl_get_file (file1, type);
	if (acl1 == (acl_t)NULL)
	  {
	    text1 = NULL;
	    errno1 = errno;
	  }
	else
	  {
	    text1 = acl_to_text (acl1, NULL);
	    if (text1 == NULL)
	      errno1 = errno;
	    else
	      errno1 = 0;
	  }
	acl2 = acl_get_file (file2, type);
	if (acl2 == (acl_t)NULL)
	  {
	    text2 = NULL;
	    errno2 = errno;
	  }
	else
	  {
	    text2 = acl_to_text (acl2, NULL);
	    if (text2 == NULL)
	      errno2 = errno;
	    else
	      errno2 = 0;
	  }

	if (acl1 != (acl_t)NULL)
	  {
	    if (acl2 != (acl_t)NULL)
	      {
		if (text1 != NULL)
		  {
		    if (text2 != NULL)
		      {
			if (strcmp (text1, text2) != 0)
			  {
			    fprintf (stderr, "files %s and %s have different ACLs:\n%s\n%s\n",
				     file1, file2, text1, text2);
			    return 1;
			  }
		      }
		    else
		      {
			fprintf (stderr, "file %s has a valid ACL, but file %s has an invalid ACL\n",
				 file1, file2);
			return 1;
		      }
		  }
		else
		  {
		    if (text2 != NULL)
		      {
			fprintf (stderr, "file %s has an invalid ACL, but file %s has a valid ACL\n",
				 file1, file2);
			return 1;
		      }
		    else
		      {
			if (errno1 != errno2)
			  {
			    fprintf (stderr, "files %s and %s have differently invalid ACLs, errno = %d vs. %d\n",
				     file1, file2, errno1, errno2);
			    return 1;
			  }
		      }
		  }
	      }
	    else
	      {
		fprintf (stderr, "file %s has an ACL, but file %s has no ACL\n",
			 file1, file2);
		return 1;
	      }
	  }
	else
	  {
	    if (acl2 != (acl_t)NULL)
	      {
		fprintf (stderr, "file %s has no ACL, but file %s has an ACL\n",
			 file1, file2);
		return 1;
	      }
	  }
      }
#elif HAVE_ACL && defined GETACL /* Solaris, Cygwin, not HP-UX */
  int count1;
  int count2;

  count1 = acl (file1, GETACLCNT, 0, NULL);
  count2 = acl (file2, GETACLCNT, 0, NULL);

  if (count1 < 0)
    {
      fprintf (stderr, "error accessing the ACLs of file %s\n", file1);
      fflush (stderr);
      abort ();
    }
  if (count2 < 0)
    {
      fprintf (stderr, "error accessing the ACLs of file %s\n", file2);
      fflush (stderr);
      abort ();
    }
  if (count1 != count2)
    {
      fprintf (stderr, "files %s and %s have different number of ACLs: %d and %d\n",
	       file1, file2, count1, count2);
      return 1;
    }
  else
    {
      aclent_t *entries1 = XNMALLOC (count1, aclent_t);
      aclent_t *entries2 = XNMALLOC (count2, aclent_t);
      int i;

      if (acl (file1, GETACL, count1, entries1) < count1)
	{
	  fprintf (stderr, "error retrieving the ACLs of file %s\n", file1);
	  fflush (stderr);
	  abort ();
	}
      if (acl (file2, GETACL, count2, entries2) < count1)
	{
	  fprintf (stderr, "error retrieving the ACLs of file %s\n", file2);
	  fflush (stderr);
	  abort ();
	}
      for (i = 0; i < count1; i++)
	{
	  if (entries1[i].a_type != entries2[i].a_type)
	    {
	      fprintf (stderr, "files %s and %s: different ACL entry #%d: different types %d and %d\n",
		       file1, file2, i, entries1[i].a_type, entries2[i].a_type);
	      return 1;
	    }
	  if (entries1[i].a_id != entries2[i].a_id)
	    {
	      fprintf (stderr, "files %s and %s: different ACL entry #%d: different ids %d and %d\n",
		       file1, file2, i, (int)entries1[i].a_id, (int)entries2[i].a_id);
	      return 1;
	    }
	  if (entries1[i].a_perm != entries2[i].a_perm)
	    {
	      fprintf (stderr, "files %s and %s: different ACL entry #%d: different permissions %03o and %03o\n",
		       file1, file2, i, (unsigned int) entries1[i].a_perm, (unsigned int) entries2[i].a_perm);
	      return 1;
	    }
	}
    }
# ifdef ACE_GETACL
  count1 = acl (file1, ACE_GETACLCNT, 0, NULL);
  if (count1 < 0 && errno == EINVAL)
    count1 = 0;
  count2 = acl (file2, ACE_GETACLCNT, 0, NULL);
  if (count2 < 0 && errno == EINVAL)
    count2 = 0;
  if (count1 < 0)
    {
      fprintf (stderr, "error accessing the ACE-ACLs of file %s\n", file1);
      fflush (stderr);
      abort ();
    }
  if (count2 < 0)
    {
      fprintf (stderr, "error accessing the ACE-ACLs of file %s\n", file2);
      fflush (stderr);
      abort ();
    }
  if (count1 != count2)
    {
      fprintf (stderr, "files %s and %s have different number of ACE-ACLs: %d and %d\n",
	       file1, file2, count1, count2);
      return 1;
    }
  else if (count1 > 0)
    {
      ace_t *entries1 = XNMALLOC (count1, ace_t);
      ace_t *entries2 = XNMALLOC (count2, ace_t);
      int i;

      if (acl (file1, ACE_GETACL, count1, entries1) < count1)
	{
	  fprintf (stderr, "error retrieving the ACE-ACLs of file %s\n", file1);
	  fflush (stderr);
	  abort ();
	}
      if (acl (file2, ACE_GETACL, count2, entries2) < count1)
	{
	  fprintf (stderr, "error retrieving the ACE-ACLs of file %s\n", file2);
	  fflush (stderr);
	  abort ();
	}
      for (i = 0; i < count1; i++)
	{
	  if (entries1[i].a_type != entries2[i].a_type)
	    {
	      fprintf (stderr, "files %s and %s: different ACE-ACL entry #%d: different types %d and %d\n",
		       file1, file2, i, entries1[i].a_type, entries2[i].a_type);
	      return 1;
	    }
	  if (entries1[i].a_who != entries2[i].a_who)
	    {
	      fprintf (stderr, "files %s and %s: different ACE-ACL entry #%d: different ids %d and %d\n",
		       file1, file2, i, (int)entries1[i].a_who, (int)entries2[i].a_who);
	      return 1;
	    }
	  if (entries1[i].a_access_mask != entries2[i].a_access_mask)
	    {
	      fprintf (stderr, "files %s and %s: different ACE-ACL entry #%d: different access masks %03o and %03o\n",
		       file1, file2, i, (unsigned int) entries1[i].a_access_mask, (unsigned int) entries2[i].a_access_mask);
	      return 1;
	    }
	  if (entries1[i].a_flags != entries2[i].a_flags)
	    {
	      fprintf (stderr, "files %s and %s: different ACE-ACL entry #%d: different flags 0x%x and 0x%x\n",
		       file1, file2, i, (unsigned int) entries1[i].a_flags, (unsigned int) entries2[i].a_flags);
	      return 1;
	    }
	}
    }
# endif
#elif HAVE_GETACL /* HP-UX */
  int count1;
  int count2;

  count1 = getacl (file1, 0, NULL);
  if (count1 < 0 && (errno == ENOSYS || errno == EOPNOTSUPP))
    count1 = 0;
  count2 = getacl (file2, 0, NULL);
  if (count2 < 0 && (errno == ENOSYS || errno == EOPNOTSUPP))
    count2 = 0;

  if (count1 < 0)
    {
      fprintf (stderr, "error accessing the ACLs of file %s\n", file1);
      fflush (stderr);
      abort ();
    }
  if (count2 < 0)
    {
      fprintf (stderr, "error accessing the ACLs of file %s\n", file2);
      fflush (stderr);
      abort ();
    }
  if (count1 != count2)
    {
      fprintf (stderr, "files %s and %s have different number of ACLs: %d and %d\n",
	       file1, file2, count1, count2);
      return 1;
    }
  else if (count1 > 0)
    {
      struct acl_entry *entries1 = XNMALLOC (count1, struct acl_entry);
      struct acl_entry *entries2 = XNMALLOC (count2, struct acl_entry);
      int i;

      if (getacl (file1, count1, entries1) < count1)
	{
	  fprintf (stderr, "error retrieving the ACLs of file %s\n", file1);
	  fflush (stderr);
	  abort ();
	}
      if (getacl (file2, count2, entries2) < count1)
	{
	  fprintf (stderr, "error retrieving the ACLs of file %s\n", file2);
	  fflush (stderr);
	  abort ();
	}
      for (i = 0; i < count1; i++)
	{
	  if (entries1[i].uid != entries2[i].uid)
	    {
	      fprintf (stderr, "files %s and %s: different ACL entry #%d: different uids %d and %d\n",
		       file1, file2, i, (int)entries1[i].uid, (int)entries2[i].uid);
	      return 1;
	    }
	  if (entries1[i].gid != entries2[i].gid)
	    {
	      fprintf (stderr, "files %s and %s: different ACL entry #%d: different gids %d and %d\n",
		       file1, file2, i, (int)entries1[i].gid, (int)entries2[i].gid);
	      return 1;
	    }
	  if (entries1[i].mode != entries2[i].mode)
	    {
	      fprintf (stderr, "files %s and %s: different ACL entry #%d: different permissions %03o and %03o\n",
		       file1, file2, i, (unsigned int) entries1[i].mode, (unsigned int) entries2[i].mode);
	      return 1;
	    }
	}
    }
#elif HAVE_ACLX_GET /* AIX */
  acl_type_t type1;
  char acl1[1000];
  size_t aclsize1 = sizeof (acl1);
  mode_t mode1;
  char text1[1000];
  acl_type_t type2;
  char acl2[1000];
  size_t aclsize2 = sizeof (acl2);
  mode_t mode2;
  char text2[1000];

  /* The docs say that type1 being 0 is equivalent to ACL_ANY, but it is not
     true, in AIX 5.3.  */
  type1.u64 = ACL_ANY;
  if (aclx_get (file1, 0, &type1, acl1, &aclsize1, &mode1) < 0)
    {
      fprintf (stderr, "error accessing the ACLs of file %s\n", file1);
      fflush (stderr);
      abort ();
    }
  if (aclx_printStr (text1, sizeof (text1), acl1, aclsize1, type1, file1, 0) < 0)
    {
      fprintf (stderr, "cannot convert the ACLs of file %s to text\n", file1);
      fflush (stderr);
      abort ();
    }

  /* The docs say that type2 being 0 is equivalent to ACL_ANY, but it is not
     true, in AIX 5.3.  */
  type2.u64 = ACL_ANY;
  if (aclx_get (file2, 0, &type2, acl2, &aclsize2, &mode2) < 0)
    {
      fprintf (stderr, "error accessing the ACLs of file %s\n", file2);
      fflush (stderr);
      abort ();
    }
  if (aclx_printStr (text2, sizeof (text2), acl2, aclsize2, type2, file2, 0) < 0)
    {
      fprintf (stderr, "cannot convert the ACLs of file %s to text\n", file2);
      fflush (stderr);
      abort ();
    }

  if (strcmp (text1, text2) != 0)
    {
      fprintf (stderr, "files %s and %s have different ACLs:\n%s\n%s\n",
	       file1, file2, text1, text2);
      return 1;
    }
#elif HAVE_STATACL /* older AIX */
  union { struct acl a; char room[4096]; } acl1;
  union { struct acl a; char room[4096]; } acl2;
  unsigned int i;

  if (statacl (file1, STX_NORMAL, &acl1.a, sizeof (acl1)) < 0)
    {
      fprintf (stderr, "error accessing the ACLs of file %s\n", file1);
      fflush (stderr);
      abort ();
    }
  if (statacl (file2, STX_NORMAL, &acl2.a, sizeof (acl2)) < 0)
    {
      fprintf (stderr, "error accessing the ACLs of file %s\n", file2);
      fflush (stderr);
      abort ();
    }

  if (acl1.a.acl_len != acl2.a.acl_len)
    {
      fprintf (stderr, "files %s and %s have different ACL lengths: %u and %u\n",
	       file1, file2, acl1.a.acl_len, acl2.a.acl_len);
      return 1;
    }
  if (acl1.a.acl_mode != acl2.a.acl_mode)
    {
      fprintf (stderr, "files %s and %s have different ACL modes: %03o and %03o\n",
	       file1, file2, acl1.a.acl_mode, acl2.a.acl_mode);
      return 1;
    }
  if (acl1.a.u_access != acl2.a.u_access
      || acl1.a.g_access != acl2.a.g_access
      || acl1.a.o_access != acl2.a.o_access)
    {
      fprintf (stderr, "files %s and %s have different ACL access masks: %03o %03o %03o and %03o %03o %03o\n",
	       file1, file2,
	       acl1.a.u_access, acl1.a.g_access, acl1.a.o_access,
	       acl2.a.u_access, acl2.a.g_access, acl2.a.o_access);
      return 1;
    }
  if (memcmp (acl1.a.acl_ext, acl2.a.acl_ext, acl1.a.acl_len) != 0)
    {
      fprintf (stderr, "files %s and %s have different ACL entries\n",
	       file1, file2);
      return 1;
    }
#endif
  }

  return 0;
}
