summaryrefslogtreecommitdiffstats
path: root/m4/sudo.m4
blob: 90fb25472b98f1bcf20017c6373558bb2a97f3ee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
dnl Local m4 macros for autoconf (used by sudo)
dnl
dnl SPDX-License-Identifier: ISC
dnl
dnl Copyright (c) 1994-1996, 1998-2005, 2007-2015
dnl	Todd C. Miller <Todd.Miller@sudo.ws>
dnl
dnl Permission to use, copy, modify, and distribute this software for any
dnl purpose with or without fee is hereby granted, provided that the above
dnl copyright notice and this permission notice appear in all copies.
dnl
dnl THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
dnl WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
dnl MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
dnl ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
dnl WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
dnl ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
dnl OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
dnl
dnl XXX - should cache values in all cases!!!
dnl
dnl checks for programs

dnl
dnl check for sendmail in well-known locations
dnl
AC_ARG_VAR([SENDMAILPROG], [The fully-qualified path to the sendmail program to use.])
AC_DEFUN([SUDO_PROG_SENDMAIL], [
    AC_PATH_PROG([SENDMAILPROG], [sendmail], [], [/usr/sbin$PATH_SEPARATOR/usr/lib$PATH_SEPARATOR/usr/etc$PATH_SEPARATOR/usr/ucblib$PATH_SEPARATOR/usr/local/lib$PATH_SEPARATOR/usr/local/bin])
    test -n "${ac_cv_path_SENDMAILPROG}" && SUDO_DEFINE_UNQUOTED(_PATH_SUDO_SENDMAIL, "${ac_cv_path_SENDMAILPROG}")
])dnl

dnl
dnl check for vi in well-known locations
dnl
AC_ARG_VAR([VIPROG], [The fully-qualified path to the vi program to use.])
AC_DEFUN([SUDO_PROG_VI], [
    AC_PATH_PROG([VIPROG], [vi], [], [/usr/bin$PATH_SEPARATOR/bin$PATH_SEPARATOR/usr/ucb$PATH_SEPARATOR/usr/bsd$PATH_SEPARATOR/usr/local/bin])
    test -n "${ac_cv_path_VIPROG}" && SUDO_DEFINE_UNQUOTED(_PATH_VI, "${ac_cv_path_VIPROG}")
])dnl

dnl
dnl check for mv in well-known locations
dnl
AC_ARG_VAR([MVPROG], [The fully-qualified path to the mv program to use.])
AC_DEFUN([SUDO_PROG_MV], [
    AC_PATH_PROG([MVPROG], [mv], [], [/usr/bin$PATH_SEPARATOR/bin$PATH_SEPARATOR/usr/ucb$PATH_SEPARATOR/usr/local/bin])
    test -n "${ac_cv_path_MVPROG}" && SUDO_DEFINE_UNQUOTED(_PATH_MV, "${ac_cv_path_MVPROG}")
])dnl

dnl
dnl check for bourne shell in well-known locations
dnl
AC_ARG_VAR([BSHELLPROG], [The fully-qualified path to the Bourne shell to use.])
AC_DEFUN([SUDO_PROG_BSHELL], [
    AC_PATH_PROG([BSHELLPROG], [sh], [/usr/bin$PATH_SEPARATOR/bin$PATH_SEPARATOR/usr/sbin$PATH_SEPARATOR/sbin])
    test -n "${ac_cv_path_BSHELLPROG}" && SUDO_DEFINE_UNQUOTED(_PATH_BSHELL, "${ac_cv_path_BSHELLPROG}")
])dnl

dnl
dnl check for utmp file
dnl
AC_DEFUN([SUDO_PATH_UTMP], [AC_MSG_CHECKING([for utmp file path])
found=no
for p in "/var/run/utmp" "/var/adm/utmp" "/etc/utmp"; do
    if test -r "$p"; then
	found=yes
	AC_MSG_RESULT([$p])
	SUDO_DEFINE_UNQUOTED(_PATH_UTMP, "$p")
	break
    fi
done
if test X"$found" != X"yes"; then
    AC_MSG_RESULT([not found])
fi
])dnl

dnl
dnl Where the log file goes, use /var/log if it exists, else /{var,usr}/adm
dnl
AC_DEFUN([SUDO_LOGFILE], [AC_MSG_CHECKING(for log file location)
    if test "${with_logpath-yes}" != "yes"; then
	logpath="$with_logpath"
    else
	# Default value of logpath set in configure.ac
	for d in /var/log /var/adm /usr/adm; do
	    if test -d "$d"; then
		logpath="$d/sudo.log"
		break
	    fi
	done
    fi
    AC_MSG_RESULT($logpath)
    SUDO_DEFINE_UNQUOTED(_PATH_SUDO_LOGFILE, "$logpath")
])dnl

dnl
dnl Detect time zone file directory, if any.
dnl
AC_DEFUN([SUDO_TZDIR], [AC_MSG_CHECKING(time zone data directory)
tzdir="$with_tzdir"
if test -z "$tzdir"; then
    tzdir=no
    for d in /usr/share /usr/share/lib /usr/lib /etc; do
	if test -d "$d/zoneinfo"; then
	    tzdir="$d/zoneinfo"
	    break
	fi
    done
fi
AC_MSG_RESULT([$tzdir])
if test "${tzdir}" != "no"; then
    SUDO_DEFINE_UNQUOTED(_PATH_ZONEINFO, "$tzdir")
fi
])dnl

dnl
dnl Parent directory for time stamp dir.
dnl
AC_DEFUN([SUDO_RUNDIR], [AC_MSG_CHECKING(for sudo run dir location)
if test -n "$with_rundir"; then
    rundir="$with_rundir"
elif test -n "$runstatedir" && test "$runstatedir" != '${localstatedir}/run'; then
    rundir="$runstatedir/sudo"
else
    # No --with-rundir or --runstatedir specified
    for d in /run /var/run /var/db /var/lib /var/adm /usr/adm; do
	if test -d "$d"; then
	    rundir="$d/sudo"
	    break
	fi
    done
fi
AC_MSG_RESULT([$rundir])
SUDO_DEFINE_UNQUOTED(_PATH_SUDO_TIMEDIR, "$rundir/ts")
SUDO_DEFINE_UNQUOTED(_PATH_SUDO_LOGSRVD_PID, "$rundir/sudo_logsrvd.pid")
])dnl

dnl
dnl Parent directory for the lecture status dir.
dnl
AC_DEFUN([SUDO_VARDIR], [AC_MSG_CHECKING(for sudo var dir location)
vardir="$with_vardir"
if test -z "$vardir"; then
    for d in /var/db /var/lib /var/adm /usr/adm; do
	if test -d "$d"; then
	    vardir="$d/sudo"
	    break
	fi
    done
fi
AC_MSG_RESULT([$vardir])
SUDO_DEFINE_UNQUOTED(_PATH_SUDO_LECTURE_DIR, "$vardir/lectured")
])dnl

dnl
dnl Where the I/O log files go, use /var/log/sudo-io if
dnl /var/log exists, else /{var,usr}/adm/sudo-io
dnl
AC_DEFUN([SUDO_IO_LOGDIR], [
    AC_MSG_CHECKING(for I/O log dir location)
    if test "${with_iologdir-yes}" != "yes"; then
	iolog_dir="$with_iologdir"
    else
	# Default value of iolog_dir set in configure.ac
	for d in /var/log /var/adm /usr/adm; do
	    if test -d "$d"; then
		iolog_dir="$d/sudo-io"
		break
	    fi
	done
    fi
    if test "${with_iologdir}" != "no"; then
	SUDO_DEFINE_UNQUOTED(_PATH_SUDO_IO_LOGDIR, "$iolog_dir")
    fi
    AC_MSG_RESULT($iolog_dir)
])dnl

dnl
dnl Where the log files go, use /var/log if it exists, else /{var,usr}/adm
dnl
AC_DEFUN([SUDO_LOGDIR], [
    AC_MSG_CHECKING(for log dir location)
    if test "${with_logdir-yes}" != "yes"; then
	log_dir="$with_logdir"
    else
	# Default value of log_dir set in configure.ac
	for d in /var/log /var/adm /usr/adm; do
	    if test -d "$d"; then
		log_dir="$d"
		break
	    fi
	done
    fi
    if test "${with_logdir}" != "no"; then
	SUDO_DEFINE_UNQUOTED(_PATH_SUDO_LOGDIR, "$log_dir")
    fi
    AC_MSG_RESULT($log_dir)
])dnl

dnl
dnl check for working fnmatch(3)
dnl
AC_DEFUN([SUDO_FUNC_FNMATCH],
[AC_MSG_CHECKING([for working fnmatch with FNM_CASEFOLD])
AC_CACHE_VAL(sudo_cv_func_fnmatch,
[rm -f conftestdata; > conftestdata
AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <fnmatch.h>
int main() { return(fnmatch("/*/bin/echo *", "/usr/bin/echo just a test", FNM_CASEFOLD)); }]])], [sudo_cv_func_fnmatch=yes], [sudo_cv_func_fnmatch=no],
  [sudo_cv_func_fnmatch=no])
rm -f core core.* *.core])
AC_MSG_RESULT($sudo_cv_func_fnmatch)
AS_IF([test $sudo_cv_func_fnmatch = yes], [$1], [$2])])

dnl
dnl Attempt to check for working PIE support.
dnl This is a bit of a hack but on Solaris 10 with GNU ld and GNU as
dnl we can end up with strange values from malloc().
dnl A better check would be to verify that ASLR works with PIE.
dnl
AC_DEFUN([SUDO_WORKING_PIE],
[AC_MSG_CHECKING([for working PIE support])
AC_CACHE_VAL(sudo_cv_working_pie,
[rm -f conftestdata; > conftestdata
AC_RUN_IFELSE([AC_LANG_SOURCE([AC_INCLUDES_DEFAULT
int main() { char *p = malloc(1024); if (p == NULL) return 1; memset(p, 0, 1024); return 0; }])], [sudo_cv_working_pie=yes], [sudo_cv_working_pie=no],
  [sudo_cv_working_pie=no])
rm -f core core.* *.core])
AC_MSG_RESULT($sudo_cv_working_pie)
AS_IF([test $sudo_cv_working_pie = yes], [$1], [$2])])

dnl
dnl check for isblank(3)
dnl
AC_DEFUN([SUDO_FUNC_ISBLANK],
  [AC_CACHE_CHECK([for isblank], [sudo_cv_func_isblank],
    [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <ctype.h>]], [[return (isblank('a'));]])],
    [sudo_cv_func_isblank=yes], [sudo_cv_func_isblank=no])])
] [
  if test "$sudo_cv_func_isblank" = "yes"; then
    AC_DEFINE(HAVE_ISBLANK, 1, [Define if you have isblank(3).])
  else
    AC_LIBOBJ(isblank)
    SUDO_APPEND_COMPAT_EXP(isblank)
  fi
])

AC_DEFUN([SUDO_CHECK_LIB], [
    _sudo_check_lib_extras=`echo "$5"|sed -e 's/[ 	]*//g' -e 's/-l/_/g'`
    AC_MSG_CHECKING([for $2 in -l$1${5+ }$5])
    AC_CACHE_VAL([sudo_cv_lib_$1''_$2$_sudo_check_lib_extras], [
	SUDO_CHECK_LIB_OLIBS="$LIBS"
	LIBS="$LIBS -l$1${5+ }$5"
	AC_LINK_IFELSE(
	    [AC_LANG_CALL([], [$2])],
	    [eval sudo_cv_lib_$1''_$2$_sudo_check_lib_extras=yes],
	    [eval sudo_cv_lib_$1''_$2$_sudo_check_lib_extras=no]
	)
	LIBS="$SUDO_CHECK_LIB_OLIBS"
    ])
    if eval test \$sudo_cv_lib_$1''_$2$_sudo_check_lib_extras = "yes"; then
	AC_MSG_RESULT([yes])
	$3
    else
	AC_MSG_RESULT([no])
	$4
    fi
])

dnl
dnl check unsetenv() return value
dnl
AC_DEFUN([SUDO_FUNC_UNSETENV_VOID],
  [AC_CACHE_CHECK([whether unsetenv returns void], [sudo_cv_func_unsetenv_void],
    [AC_RUN_IFELSE([AC_LANG_PROGRAM(
      [AC_INCLUDES_DEFAULT
        int unsetenv();
      ], [
        [return unsetenv("FOO") != 0;]
      ])
    ],
    [sudo_cv_func_unsetenv_void=no],
    [sudo_cv_func_unsetenv_void=yes],
    [sudo_cv_func_unsetenv_void=no])])
    if test $sudo_cv_func_unsetenv_void = yes; then
      AC_DEFINE(UNSETENV_VOID, 1,
        [Define to 1 if the `unsetenv' function returns void instead of `int'.])
    fi
  ])

dnl
dnl check putenv() argument for const
dnl
AC_DEFUN([SUDO_FUNC_PUTENV_CONST],
[AC_CACHE_CHECK([whether putenv takes a const argument],
sudo_cv_func_putenv_const,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
int putenv(const char *string) {return 0;}], [])],
    [sudo_cv_func_putenv_const=yes],
    [sudo_cv_func_putenv_const=no])
  ])
  if test $sudo_cv_func_putenv_const = yes; then
    AC_DEFINE(PUTENV_CONST, const, [Define to const if the `putenv' takes a const argument.])
  else
    AC_DEFINE(PUTENV_CONST, [])
  fi
])

dnl
dnl check whether au_close() takes 3 or 4 arguments
dnl
AC_DEFUN([SUDO_FUNC_AU_CLOSE_SOLARIS11],
[AC_CACHE_CHECK([whether au_close() takes 4 arguments],
sudo_cv_func_au_close_solaris11,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
#include <bsm/audit.h>
#include <bsm/libbsm.h>
#include <bsm/audit_uevents.h>

int au_close(int d, int keep, au_event_t event, au_emod_t emod) {return 0;}], [])],
    [sudo_cv_func_au_close_solaris11=yes],
    [sudo_cv_func_au_close_solaris11=no])
  ])
  if test $sudo_cv_func_au_close_solaris11 = yes; then
    AC_DEFINE(HAVE_AU_CLOSE_SOLARIS11, 1, [Define to 1 if the `au_close' functions takes 4 arguments like Solaris 11.])
  fi
])

dnl
dnl Check if the data argument for the sha2 functions is void * or u_char *
dnl
AC_DEFUN([SUDO_FUNC_SHA2_VOID_PTR],
[AC_CACHE_CHECK([whether the data argument of SHA224Update() is void *],
sudo_cv_func_sha2_void_ptr,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
#include <sha2.h>
void SHA224Update(SHA2_CTX *context, const void *data, size_t len) {return;}], [])],
    [sudo_cv_func_sha2_void_ptr=yes],
    [sudo_cv_func_sha2_void_ptr=no])
  ])
  if test $sudo_cv_func_sha2_void_ptr = yes; then
    AC_DEFINE(SHA2_VOID_PTR, 1,
      [Define to 1 if the sha2 functions use `const void *' instead of `const unsigned char'.])
  fi
])

dnl
dnl check for sa_len field in struct sockaddr
dnl
AC_DEFUN([SUDO_SOCK_SA_LEN], [
    AC_CHECK_MEMBER([struct sockaddr.sa_len], 
	[AC_DEFINE(HAVE_STRUCT_SOCKADDR_SA_LEN, 1, [Define if your struct sockaddr has an sa_len field.])],
	[], [
#	  include <sys/types.h>
#	  include <sys/socket.h>] 
    )]
)

dnl
dnl check for sin_len field in struct sockaddr_in
dnl
AC_DEFUN([SUDO_SOCK_SIN_LEN], [
    AC_CHECK_MEMBER([struct sockaddr_in.sin_len],
	[AC_DEFINE(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN, 1, [Define if your struct sockaddr_in has a sin_len field.])],
	[], [
#	  include <sys/types.h>
#	  include <sys/socket.h>]
    )]
)

dnl
dnl check for max length of uid_t in string representation.
dnl we can't really trust UID_MAX or MAXUID since they may exist
dnl only for backward compatibility.
dnl
AC_DEFUN([SUDO_UID_T_LEN],
[AC_REQUIRE([AC_TYPE_UID_T])
AC_MSG_CHECKING(max length of uid_t)
AC_CACHE_VAL(sudo_cv_uid_t_len,
[rm -f conftestdata
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <string.h>
#include <pwd.h>
#include <limits.h>
#include <sys/types.h>
int main() {
  FILE *f;
  char b[1024];
  uid_t u = (uid_t) -1;

  if ((f = fopen("conftestdata", "w")) == NULL)
    return(1);

  (void) sprintf(b, "%lu", (unsigned long) u);
  (void) fprintf(f, "%d\n", (int)strlen(b));
  (void) fclose(f);
  return(0);
}]])], [sudo_cv_uid_t_len=`cat conftestdata`], [sudo_cv_uid_t_len=10], [sudo_cv_uid_t_len=10])
])
rm -f conftestdata
AC_MSG_RESULT($sudo_cv_uid_t_len)
AC_DEFINE_UNQUOTED(MAX_UID_T_LEN, $sudo_cv_uid_t_len, [Define to the max length of a uid_t in string context (excluding the NUL).])
])

dnl
dnl There are three different utmp variants we need to check for.
dnl SUDO_CHECK_UTMP_MEMBERS(utmp_type)
dnl
AC_DEFUN([SUDO_CHECK_UTMP_MEMBERS], [
    dnl
    dnl Check for utmp/utmpx/utmps struct members.
    dnl
    AC_CHECK_MEMBER([struct $1.ut_id], [
	AC_DEFINE(HAVE_STRUCT_UTMP_UT_ID, 1, [Define to 1 if `ut_id' is a member of `struct utmp'.])
    ], [], [
#	include <sys/types.h>
#	include <$1.h>
    ])
    AC_CHECK_MEMBER([struct $1.ut_pid], [
	AC_DEFINE(HAVE_STRUCT_UTMP_UT_PID, 1, [Define to 1 if `ut_pid' is a member of `struct utmp'.])
    ], [], [
#	include <sys/types.h>
#	include <$1.h>
    ])
    AC_CHECK_MEMBER([struct $1.ut_tv], [
	AC_DEFINE(HAVE_STRUCT_UTMP_UT_TV, 1, [Define to 1 if `ut_tv' is a member of `struct utmp'.])
    ], [], [
#	include <sys/types.h>
#	include <$1.h>
    ])
    AC_CHECK_MEMBER([struct $1.ut_type], [
	AC_DEFINE(HAVE_STRUCT_UTMP_UT_TYPE, 1, [Define to 1 if `ut_type' is a member of `struct utmp'.])
    ], [], [
#	include <sys/types.h>
#	include <$1.h>
    ])
    dnl
    dnl Older struct utmp has ut_name instead of ut_user
    dnl
    if test "$1" = "utmp"; then
	AC_CHECK_MEMBERS([struct utmp.ut_user], [], [], [
#	include <sys/types.h>
#	include <$1.h>
	])
    fi
    dnl
    dnl Check for ut_exit.__e_termination first, then ut_exit.e_termination
    dnl We need to have already defined _GNU_SOURCE on glibc which only has
    dnl __e_termination visible when _GNU_SOURCE is *not* defined.
    dnl
    AC_CHECK_MEMBER([struct $1.ut_exit.__e_termination], [
	AC_DEFINE(HAVE_STRUCT_UTMP_UT_EXIT, 1, [Define to 1 if `ut_exit' is a member of `struct utmp'.])
	AC_DEFINE(HAVE_STRUCT_UTMP_UT_EXIT___E_TERMINATION, 1, [Define to 1 if `ut_exit.__e_termination' is a member of `struct utmp'.])
    ], [
	AC_CHECK_MEMBER([struct $1.ut_exit.e_termination], [
	    AC_DEFINE(HAVE_STRUCT_UTMP_UT_EXIT, 1, [Define to 1 if `ut_exit' is a member of `struct utmp'.])
	    AC_DEFINE(HAVE_STRUCT_UTMP_UT_EXIT_E_TERMINATION, 1, [Define to 1 if `ut_exit.e_termination' is a member of `struct utmp'.])
	], [], [
#	    include <sys/types.h>
#	    include <$1.h>
	])
    ], [
#	include <sys/types.h>
#	include <$1.h>
    ])
])

dnl
dnl Append a libpath to an LDFLAGS style variable if not already present.
dnl Also appends to the _R version unless rpath is disabled.
dnl
AC_DEFUN([SUDO_APPEND_LIBPATH], [
    AX_APPEND_FLAG([-L$2], [$1])
    if test X"$enable_rpath" = X"yes"; then
	AX_APPEND_FLAG([-R$2], [$1_R])
    fi
])

dnl
dnl Append one or more symbols to COMPAT_EXP
dnl
AC_DEFUN([SUDO_APPEND_COMPAT_EXP], [
    for _sym in $1; do
	COMPAT_EXP="${COMPAT_EXP}${_sym}
"
    done
])

dnl
dnl Determine the mail spool location
dnl NOTE: must be run *after* check for paths.h
dnl
AC_DEFUN([SUDO_MAILDIR], [
maildir=no
if test X"$ac_cv_header_paths_h" = X"yes"; then
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
#include <paths.h>],
[char *p = _PATH_MAILDIR;])], [maildir=yes], [])
fi
if test $maildir = no; then
    # Solaris has maillock.h which defines MAILDIR
    AC_CHECK_HEADERS(maillock.h, [
	SUDO_DEFINE(_PATH_MAILDIR, MAILDIR)
	maildir=yes
    ])
    if test $maildir = no; then
	for d in /var/mail /var/spool/mail /usr/spool/mail; do
	    if test -d "$d"; then
		maildir=yes
		SUDO_DEFINE_UNQUOTED(_PATH_MAILDIR, "$d")
		break
	    fi
	done
	if test $maildir = no; then
	    # unable to find mail dir, hope for the best
	    SUDO_DEFINE_UNQUOTED(_PATH_MAILDIR, "/var/mail")
	fi
    fi
fi
])

dnl
dnl private versions of AC_DEFINE and AC_DEFINE_UNQUOTED that don't support
dnl tracing that we use to define paths for pathnames.h so autoheader doesn't
dnl put them in config.h.in.  An awful hack.
dnl
m4_define([SUDO_DEFINE],
[cat >>confdefs.h <<\EOF
[@%:@define] $1 m4_if($#, 2, [$2], $#, 3, [$2], 1)
EOF
])

m4_define([SUDO_DEFINE_UNQUOTED],
[cat >>confdefs.h <<EOF
[@%:@define] $1 m4_if($#, 2, [$2], $#, 3, [$2], 1)
EOF
])