configure.ac 60.2 KB
Newer Older
Roger Dingledine's avatar
Roger Dingledine committed
1
dnl Copyright (c) 2001-2004, Roger Dingledine
2
dnl Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson
3
dnl Copyright (c) 2007-2015, The Tor Project, Inc.
Nick Mathewson's avatar
Nick Mathewson committed
4
dnl See LICENSE for licensing information
5

6
AC_PREREQ([2.63])
Nick Mathewson's avatar
Nick Mathewson committed
7
AC_INIT([tor],[0.2.9.17])
Stewart Smith's avatar
Stewart Smith committed
8
AC_CONFIG_SRCDIR([src/or/main.c])
9
AC_CONFIG_MACRO_DIR([m4])
10
11
12
13
14
15

# "foreign" means we don't follow GNU package layout standards
# "1.11" means we require automake version 1.11 or newer
# "subdir-objects" means put .o files in the same directory as the .c files
AM_INIT_AUTOMAKE([foreign 1.11 subdir-objects])

16
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
17
AC_CONFIG_HEADERS([orconfig.h])
18

19
AC_USE_SYSTEM_EXTENSIONS
20
21
AC_CANONICAL_HOST

22
23
PKG_PROG_PKG_CONFIG

24
25
if test -f "/etc/redhat-release"; then
  if test -f "/usr/kerberos/include"; then
26
    CPPFLAGS="$CPPFLAGS -I/usr/kerberos/include"
27
  fi
28
fi
29

30
31
# Not a no-op; we want to make sure that CPPFLAGS is set before we use
# the += operator on it in src/or/Makefile.am
32
CPPFLAGS="$CPPFLAGS -I\${top_srcdir}/src/common"
33

34
AC_ARG_ENABLE(openbsd-malloc,
35
   AS_HELP_STRING(--enable-openbsd-malloc, [use malloc code from OpenBSD.  Linux only]))
36
AC_ARG_ENABLE(static-openssl,
37
   AS_HELP_STRING(--enable-static-openssl, [link against a static openssl library. Requires --with-openssl-dir]))
38
AC_ARG_ENABLE(static-libevent,
39
   AS_HELP_STRING(--enable-static-libevent, [link against a static libevent library. Requires --with-libevent-dir]))
40
AC_ARG_ENABLE(static-zlib,
41
   AS_HELP_STRING(--enable-static-zlib, [link against a static zlib library. Requires --with-zlib-dir]))
42
AC_ARG_ENABLE(static-tor,
43
   AS_HELP_STRING(--enable-static-tor, [create an entirely static Tor binary. Requires --with-openssl-dir and --with-libevent-dir and --with-zlib-dir]))
44
AC_ARG_ENABLE(unittests,
45
   AS_HELP_STRING(--disable-unittests, [don't build unit tests for Tor. Risky!]))
46
AC_ARG_ENABLE(coverage,
47
   AS_HELP_STRING(--enable-coverage, [enable coverage support in the unit-test build]))
48
49
AC_ARG_ENABLE(asserts-in-tests,
   AS_HELP_STRING(--disable-asserts-in-tests, [disable tor_assert() calls in the unit tests, for branch coverage]))
50
AC_ARG_ENABLE(system-torrc,
51
   AS_HELP_STRING(--disable-system-torrc, [don't look for a system-wide torrc file]))
52

53
if test "x$enable_coverage" != "xyes" -a "x$enable_asserts_in_tests" = "xno" ; then
54
55
56
    AC_MSG_ERROR([Can't disable assertions outside of coverage build])
fi

57
58
59
AM_CONDITIONAL(UNITTESTS_ENABLED, test "x$enable_unittests" != "xno")
AM_CONDITIONAL(COVERAGE_ENABLED, test "x$enable_coverage" = "xyes")
AM_CONDITIONAL(DISABLE_ASSERTS_IN_UNIT_TESTS, test "x$enable_asserts_in_tests" = "xno")
60

61
62
63
64
65
66
if test "$enable_static_tor" = "yes"; then
  enable_static_libevent="yes";
  enable_static_openssl="yes";
  enable_static_zlib="yes";
  CFLAGS="$CFLAGS -static"
fi
67

68
69
70
71
72
if test "$enable_system_torrc" = "no"; then
  AC_DEFINE(DISABLE_SYSTEM_TORRC, 1,
            [Defined if we're not going to look for a torrc in SYSCONF])
fi

73
AM_CONDITIONAL(USE_OPENBSD_MALLOC, test "x$enable_openbsd_malloc" = "xyes")
74

75
AC_ARG_ENABLE(asciidoc,
76
     AS_HELP_STRING(--disable-asciidoc, [don't use asciidoc (disables building of manpages)]),
77
     [case "${enableval}" in
78
79
        "yes") asciidoc=true ;;
        "no")  asciidoc=false ;;
80
81
82
        *) AC_MSG_ERROR(bad value for --disable-asciidoc) ;;
      esac], [asciidoc=true])

83
84
# systemd notify support
AC_ARG_ENABLE(systemd,
85
      AS_HELP_STRING(--enable-systemd, [enable systemd notification support]),
86
      [case "${enableval}" in
87
88
        "yes") systemd=true ;;
        "no")  systemd=false ;;
89
90
91
92
93
94
        * ) AC_MSG_ERROR(bad value for --enable-systemd) ;;
      esac], [systemd=auto])



# systemd support
95
if test "x$enable_systemd" = "xno"; then
96
97
98
99
100
101
    have_systemd=no;
else
    PKG_CHECK_MODULES(SYSTEMD,
        [libsystemd-daemon],
        have_systemd=yes,
        have_systemd=no)
102
    if test "x$have_systemd" = "xno"; then
103
104
105
106
107
108
        AC_MSG_NOTICE([Okay, checking for systemd a different way...])
        PKG_CHECK_MODULES(SYSTEMD,
            [libsystemd],
            have_systemd=yes,
            have_systemd=no)
    fi
109
110
fi

111
if test "x$have_systemd" = "xyes"; then
112
    AC_DEFINE(HAVE_SYSTEMD,1,[Have systemd])
113
    TOR_SYSTEMD_CFLAGS="${SYSTEMD_CFLAGS}"
114
    TOR_SYSTEMD_LIBS="${SYSTEMD_LIBS}"
115
    PKG_CHECK_MODULES(LIBSYSTEMD209, [libsystemd >= 209],
116
         [AC_DEFINE(HAVE_SYSTEMD_209,1,[Have systemd v209 or more])], [])
117
fi
118
AC_SUBST(TOR_SYSTEMD_CFLAGS)
119
120
AC_SUBST(TOR_SYSTEMD_LIBS)

121
if test "x$enable_systemd" = "xyes" -a "x$have_systemd" != "xyes" ; then
122
123
124
    AC_MSG_ERROR([Explicitly requested systemd support, but systemd not found])
fi

125
case "$host" in
126
127
128
129
130
   *-*-solaris* )
     AC_DEFINE(_REENTRANT, 1, [Define on some platforms to activate x_r() functions in time.h])
     ;;
esac

131
AC_ARG_ENABLE(gcc-warnings,
132
133
134
     AS_HELP_STRING(--enable-gcc-warnings, [deprecated alias for enable-fatal-warnings]))
AC_ARG_ENABLE(fatal-warnings,
     AS_HELP_STRING(--enable-fatal-warnings, [tell the compiler to treat all warnings as errors.]))
135
AC_ARG_ENABLE(gcc-warnings-advisory,
136
     AS_HELP_STRING(--disable-gcc-warnings-advisory, [disable the regular verbose warnings]))
137

138
139
dnl Others suggest '/gs /safeseh /nxcompat /dynamicbase' for non-gcc on Windows
AC_ARG_ENABLE(gcc-hardening,
140
    AS_HELP_STRING(--disable-gcc-hardening, [disable compiler security checks]))
141

142
AC_ARG_ENABLE(expensive-hardening,
143
    AS_HELP_STRING(--enable-expensive-hardening, [enable more expensive compiler hardening; makes Tor slower]))
144

145
146
147
dnl Linker hardening options
dnl Currently these options are ELF specific - you can't use this with MacOSX
AC_ARG_ENABLE(linker-hardening,
148
    AS_HELP_STRING(--disable-linker-hardening, [disable linker security fixups]))
149

150
AC_ARG_ENABLE(local-appdata,
151
   AS_HELP_STRING(--enable-local-appdata, [default to host local application data paths on Windows]))
152
153
154
155
156
if test "$enable_local_appdata" = "yes"; then
  AC_DEFINE(ENABLE_LOCAL_APPDATA, 1,
            [Defined if we default to host local appdata paths on Windows])
fi

157
158
# Tor2web mode flag
AC_ARG_ENABLE(tor2web-mode,
159
     AS_HELP_STRING(--enable-tor2web-mode, [support tor2web non-anonymous mode]),
160
[if test "x$enableval" = "xyes"; then
161
162
163
    CFLAGS="$CFLAGS -D ENABLE_TOR2WEB_MODE=1"
fi])

164
AC_ARG_ENABLE(tool-name-check,
165
     AS_HELP_STRING(--disable-tool-name-check, [check for sanely named toolchain when cross-compiling]))
166

167
AC_ARG_ENABLE(seccomp,
168
     AS_HELP_STRING(--disable-seccomp, [do not attempt to use libseccomp]))
169

170
AC_ARG_ENABLE(libscrypt,
171
     AS_HELP_STRING(--disable-libscrypt, [do not attempt to use libscrypt]))
172

173
174
175
176
177
178
dnl check for the correct "ar" when cross-compiling
AN_MAKEVAR([AR], [AC_PROG_AR])
AN_PROGRAM([ar], [AC_PROG_AR])
AC_DEFUN([AC_PROG_AR], [AC_CHECK_TOOL([AR], [ar], [ar])])
AC_PROG_AR

179
180
181
182
183
184
dnl Check whether the above macro has settled for a simply named tool even
dnl though we're cross compiling. We must do this before running AC_PROG_CC,
dnl because that will find any cc on the system, not only the cross-compiler,
dnl and then verify that a binary built with this compiler runs on the
dnl build system. It will then come to the false conclusion that we're not
dnl cross-compiling.
185
186
if test "x$enable_tool_name_check" != "xno"; then
    if test "x$ac_tool_warned" = "xyes"; then
187
        AC_MSG_ERROR([We are cross compiling but could not find a properly named toolchain. Do you have your cross-compiling toolchain in PATH? (You can --disable-tool-name-check to ignore this.)])
188
	elif test "x$ac_ct_AR" != "x" -a "x$cross_compiling" = "xmaybe"; then
189
190
191
192
		AC_MSG_ERROR([We think we are cross compiling but could not find a properly named toolchain. Do you have your cross-compiling toolchain in PATH? (You can --disable-tool-name-check to ignore this.)])
	fi
fi

193
AC_PROG_CC
194
AC_PROG_CPP
195
196
AC_PROG_MAKE_SET
AC_PROG_RANLIB
197

198
199
AC_PATH_PROG([PERL], [perl])

200
201
dnl autoconf 2.59 appears not to support AC_PROG_SED
AC_CHECK_PROG([SED],[sed],[sed],[/bin/false])
202

203
204
dnl check for asciidoc and a2x
AC_PATH_PROG([ASCIIDOC], [asciidoc], none)
205
AC_PATH_PROGS([A2X], [a2x a2x.py], none)
206

207
AM_CONDITIONAL(USE_ASCIIDOC, test "x$asciidoc" = "xtrue")
208

209
210
211
AM_CONDITIONAL(USE_FW_HELPER, test "x$natpmp" = "xtrue" || test "x$upnp" = "xtrue")
AM_CONDITIONAL(NAT_PMP, test "x$natpmp" = "xtrue")
AM_CONDITIONAL(MINIUPNPC, test "x$upnp" = "xtrue")
212
AM_PROG_CC_C_O
213
AC_PROG_CC_C99
214

215
AC_ARG_VAR([PYTHON], [path to Python binary])
216
217
218
219
220
AC_CHECK_PROGS(PYTHON, [ \
	python3 \
	python3.8 python3.7 python3.6 python3.5 python3.4 \
	python \
	python2 python2.7])
221
222
223
224
225
if test "x$PYTHON" = "x"; then
  AC_MSG_WARN([Python unavailable; some tests will not be run.])
fi
AM_CONDITIONAL(USEPYTHON, [test "x$PYTHON" != "x"])

226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
ifdef([AC_C_FLEXIBLE_ARRAY_MEMBER], [
AC_C_FLEXIBLE_ARRAY_MEMBER
], [
 dnl Maybe we've got an old autoconf...
 AC_CACHE_CHECK([for flexible array members],
     tor_cv_c_flexarray,
     [AC_COMPILE_IFELSE(
       AC_LANG_PROGRAM([
 struct abc { int a; char b[]; };
], [
 struct abc *def = malloc(sizeof(struct abc)+sizeof(char));
 def->b[0] = 33;
]),
  [tor_cv_c_flexarray=yes],
  [tor_cv_c_flexarray=no])])
241
 if test "$tor_cv_flexarray" = "yes"; then
242
   AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [], [Define to nothing if C supports flexible array members, and to 1 if it does not.])
243
 else
244
   AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [1], [Define to nothing if C supports flexible array members, and to 1 if it does not.])
245
246
247
 fi
])

248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
AC_CACHE_CHECK([for working C99 mid-block declaration syntax],
      tor_cv_c_c99_decl,
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([], [int x; x = 3; int y; y = 4 + x;])],
	 [tor_cv_c_c99_decl=yes],
	 [tor_cv_c_c99_decl=no] )])
if test "$tor_cv_c_c99_decl" != "yes"; then
  AC_MSG_ERROR([Your compiler doesn't support c99 mid-block declarations. This is required as of Tor 0.2.6.x])
fi

AC_CACHE_CHECK([for working C99 designated initializers],
      tor_cv_c_c99_designated_init,
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([struct s { int a; int b; };],
  	       [[ struct s ss = { .b = 5, .a = 6 }; ]])],
	 [tor_cv_c_c99_designated_init=yes],
	 [tor_cv_c_c99_designated_init=no] )])

if test "$tor_cv_c_c99_designated_init" != "yes"; then
  AC_MSG_ERROR([Your compiler doesn't support c99 designated initializers. This is required as of Tor 0.2.6.x])
fi

270
271
TORUSER=_tor
AC_ARG_WITH(tor-user,
272
        AS_HELP_STRING(--with-tor-user=NAME, [specify username for tor daemon]),
273
274
275
276
277
278
279
280
        [
           TORUSER=$withval
        ]
)
AC_SUBST(TORUSER)

TORGROUP=_tor
AC_ARG_WITH(tor-group,
281
        AS_HELP_STRING(--with-tor-group=NAME, [specify group name for tor daemon]),
282
283
284
285
286
287
        [
           TORGROUP=$withval
        ]
)
AC_SUBST(TORGROUP)

288

289
dnl If _WIN32 is defined and non-zero, we are building for win32
290
AC_MSG_CHECKING([for win32])
291
AC_RUN_IFELSE([AC_LANG_SOURCE([
292
int main(int c, char **v) {
293
294
#ifdef _WIN32
#if _WIN32
295
296
297
298
299
300
301
  return 0;
#else
  return 1;
#endif
#else
  return 2;
#endif
302
}])],
303
bwin32=true; AC_MSG_RESULT([yes]),
304
305
bwin32=false; AC_MSG_RESULT([no]),
bwin32=cross; AC_MSG_RESULT([cross])
306
307
)

308
if test "$bwin32" = "cross"; then
309
AC_MSG_CHECKING([for win32 (cross)])
310
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
311
#ifdef _WIN32
312
313
314
315
316
int main(int c, char **v) {return 0;}
#else
#error
int main(int c, char **v) {return x(y);}
#endif
317
])],
318
319
320
321
bwin32=true; AC_MSG_RESULT([yes]),
bwin32=false; AC_MSG_RESULT([no]))
fi

322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
AH_BOTTOM([
#ifdef _WIN32
/* Defined to access windows functions and definitions for >=WinXP */
# ifndef WINVER
#  define WINVER 0x0501
# endif

/* Defined to access _other_ windows functions and definitions for >=WinXP */
# ifndef _WIN32_WINNT
#  define _WIN32_WINNT 0x0501
# endif

/* Defined to avoid including some windows headers as part of Windows.h */
# ifndef WIN32_LEAN_AND_MEAN
#  define WIN32_LEAN_AND_MEAN 1
# endif
#endif
])

Nick Mathewson's avatar
Nick Mathewson committed
341

342
AM_CONDITIONAL(BUILD_NT_SERVICES, test "x$bwin32" = "xtrue")
343

344
345
dnl Enable C99 when compiling with MIPSpro
AC_MSG_CHECKING([for MIPSpro compiler])
346
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [
347
348
349
350
#if (defined(__sgi) && defined(_COMPILER_VERSION))
#error
  return x(y);
#endif
351
])],
352
bmipspro=false; AC_MSG_RESULT(no),
353
bmipspro=true; AC_MSG_RESULT(yes))
354

355
if test "$bmipspro" = "true"; then
356
357
358
  CFLAGS="$CFLAGS -c99"
fi

359
360
AC_C_BIGENDIAN

361
AC_SEARCH_LIBS(socket, [socket network])
362
AC_SEARCH_LIBS(gethostbyname, [nsl])
363
AC_SEARCH_LIBS(dlopen, [dl])
364
AC_SEARCH_LIBS(inet_aton, [resolv])
365
AC_SEARCH_LIBS(backtrace, [execinfo])
366
367
368
369
370
371
saved_LIBS="$LIBS"
AC_SEARCH_LIBS([clock_gettime], [rt])
if test "$LIBS" != "$saved_LIBS"; then
   # Looks like we need -lrt for clock_gettime().
   have_rt=yes
fi
372

373
374
375
376
if test "$bwin32" = "false"; then
  AC_SEARCH_LIBS(pthread_create, [pthread])
  AC_SEARCH_LIBS(pthread_detach, [pthread])
fi
377

378
379
AM_CONDITIONAL(THREADS_WIN32, test "$bwin32" = "true")
AM_CONDITIONAL(THREADS_PTHREADS, test "$bwin32" = "false")
380

381
AC_CHECK_FUNCS(
382
        _NSGetEnviron \
383
384
	RtlSecureZeroMemory \
	SecureZeroMemory \
Sebastian Hahn's avatar
Sebastian Hahn committed
385
        accept4 \
Nick Mathewson's avatar
Nick Mathewson committed
386
387
        backtrace \
        backtrace_symbols_fd \
388
	eventfd \
389
	explicit_bzero \
390
	timingsafe_memcmp \
391
392
393
        flock \
        ftime \
        getaddrinfo \
Sebastian Hahn's avatar
Sebastian Hahn committed
394
        getifaddrs \
395
        getpass \
396
397
398
        getrlimit \
        gettimeofday \
        gmtime_r \
399
	gnu_get_libc_version \
400
	htonll \
401
        inet_aton \
Sebastian Hahn's avatar
Sebastian Hahn committed
402
        ioctl \
403
        issetugid \
404
        llround \
405
        localtime_r \
Sebastian Hahn's avatar
Sebastian Hahn committed
406
        lround \
407
        memmem \
408
        memset_s \
409
410
	pipe \
	pipe2 \
411
        prctl \
412
	readpassphrase \
Sebastian Hahn's avatar
Sebastian Hahn committed
413
        rint \
Nick Mathewson's avatar
Nick Mathewson committed
414
        sigaction \
415
        socketpair \
416
	statvfs \
417
418
        strlcat \
        strlcpy \
419
	strnlen \
420
421
422
423
        strptime \
        strtok_r \
        strtoull \
        sysconf \
424
	sysctl \
Nick Mathewson's avatar
Nick Mathewson committed
425
	truncate \
426
        uname \
427
	usleep \
428
        vasprintf \
429
	_vscprintf
430
)
431

432
433
434
435
436
437
438
439
# Apple messed up when they added two functions functions in Sierra: they
# forgot to decorate them with appropriate AVAILABLE_MAC_OS_VERSION
# checks. So we should only probe for those functions if we are sure that we
# are not targetting OSX 10.11 or earlier.
AC_MSG_CHECKING([for a pre-Sierra OSX build target])
AC_TRY_COMPILE([
#ifdef __APPLE__
#  include <AvailabilityMacros.h>
440
441
#  ifndef MAC_OS_X_VERSION_10_12
#    define MAC_OS_X_VERSION_10_12 101200
442
443
#  endif
#  if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
444
#    if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
#      error "Running on Mac OSX 10.11 or earlier"
#    endif
#  endif
#endif
], [],
   [on_macos_pre_10_12=no ; AC_MSG_RESULT([no])],
   [on_macos_pre_10_12=yes; AC_MSG_RESULT([yes])])

if test "$on_macos_pre_10_12" = "no"; then
  AC_CHECK_FUNCS(
        clock_gettime \
        getentropy \
  )
fi

460
if test "$bwin32" != "true"; then
461
462
  AC_CHECK_HEADERS(pthread.h)
  AC_CHECK_FUNCS(pthread_create)
463
  AC_CHECK_FUNCS(pthread_condattr_setclock)
464
465
fi

466
if test "$bwin32" = "true"; then
467
468
469
470
471
472
473
  AC_CHECK_DECLS([SecureZeroMemory, _getwch], , , [
#include <windows.h>
#include <conio.h>
#include <wchar.h>
                 ])
fi

474
475
AM_CONDITIONAL(BUILD_READPASSPHRASE_C,
  test "x$ac_cv_func_readpassphrase" = "xno" && test "$bwin32" = "false")
476

477
dnl ------------------------------------------------------
478
dnl Where do you live, libevent?  And how do we call you?
479

480
if test "$bwin32" = "true"; then
481
  TOR_LIB_WS32=-lws2_32
482
  TOR_LIB_IPHLPAPI=-liphlpapi
483
484
  # Some of the cargo-cults recommend -lwsock32 as well, but I don't
  # think it's actually necessary.
485
  TOR_LIB_GDI=-lgdi32
Nick Mathewson's avatar
   
Nick Mathewson committed
486
else
487
488
  TOR_LIB_WS32=
  TOR_LIB_GDI=
Nick Mathewson's avatar
   
Nick Mathewson committed
489
fi
490
491
AC_SUBST(TOR_LIB_WS32)
AC_SUBST(TOR_LIB_GDI)
492
AC_SUBST(TOR_LIB_IPHLPAPI)
Nick Mathewson's avatar
   
Nick Mathewson committed
493

494
tor_libevent_pkg_redhat="libevent"
495
tor_libevent_pkg_debian="libevent-dev"
496
497
498
tor_libevent_devpkg_redhat="libevent-devel"
tor_libevent_devpkg_debian="libevent-dev"

499
500
501
502
dnl On Gnu/Linux or any place we require it, we'll add librt to the Libevent
dnl linking for static builds.
STATIC_LIBEVENT_FLAGS=""
if test "$enable_static_libevent" = "yes"; then
503
    if test "$have_rt" = "yes"; then
504
505
506
507
508
      STATIC_LIBEVENT_FLAGS=" -lrt "
    fi
fi

TOR_SEARCH_LIBRARY(libevent, $trylibeventdir, [-levent $STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32], [
509
#ifdef _WIN32
510
511
#include <winsock2.h>
#endif
512
#include <sys/time.h>
Roger Dingledine's avatar
Roger Dingledine committed
513
#include <sys/types.h>
514
#include <event2/event.h>], [
515
#ifdef _WIN32
516
517
#include <winsock2.h>
#endif
518
519
struct event_base;
struct event_base *event_base_new(void);],
520
    [
521
#ifdef _WIN32
522
{WSADATA d; WSAStartup(0x101,&d); }
523
#endif
524
event_base_new();
525
], [--with-libevent-dir], [/opt/libevent])
526

527
dnl Determine the incantation needed to link libevent.
528
529
save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
530
save_CPPFLAGS="$CPPFLAGS"
531
532

LIBS="$STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32 $save_LIBS"
533
LDFLAGS="$TOR_LDFLAGS_libevent $LDFLAGS"
534
CPPFLAGS="$TOR_CPPFLAGS_libevent $CPPFLAGS"
535

536
537
AC_CHECK_HEADERS(event2/event.h event2/dns.h event2/bufferevent_ssl.h)

538
539
540
541
if test "$enable_static_libevent" = "yes"; then
   if test "$tor_cv_library_libevent_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-libevent-dir=x option when using --enable-static-libevent")
   else
542
     TOR_LIBEVENT_LIBS="$TOR_LIBDIR_libevent/libevent.a $STATIC_LIBEVENT_FLAGS"
543
544
   fi
else
545
     if test "x$ac_cv_header_event2_event_h" = "xyes"; then
Nick Mathewson's avatar
Nick Mathewson committed
546
547
       AC_SEARCH_LIBS(event_new, [event event_core], , AC_MSG_ERROR("libevent2 is installed but linking it failed while searching for event_new"))
       AC_SEARCH_LIBS(evdns_base_new, [event event_extra], , AC_MSG_ERROR("libevent2 is installed but linking it failed while searching for evdns_base_new"))
548

549
       if test "$ac_cv_search_event_new" != "none required"; then
550
551
         TOR_LIBEVENT_LIBS="$ac_cv_search_event_new"
       fi
552
       if test "$ac_cv_search_evdns_base_new" != "none required"; then
553
554
555
         TOR_LIBEVENT_LIBS="$ac_cv_search_evdns_base_new $TOR_LIBEVENT_LIBS"
       fi
     else
556
       AC_MSG_ERROR("libevent2 is required but the headers could not be found")
557
     fi
558
559
fi

560
561
562
563
564
dnl Now check for particular libevent functions.
AC_CHECK_FUNCS([evutil_secure_rng_set_urandom_device_file \
                evutil_secure_rng_add_bytes \
])

565
566
567
568
LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

569
570
571
572
573
dnl Check that libevent is at least at version 2.0.10, the first stable
dnl release of its series
CPPFLAGS="$CPPFLAGS $TOR_CPPFLAGS_libevent"
AC_MSG_CHECKING([whether Libevent is new enough])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
574
#include <event2/event.h>
575
#if !defined(LIBEVENT_VERSION_NUMBER) || LIBEVENT_VERSION_NUMBER < 0x02000a00
576
577
578
579
580
#error
int x = y(zz);
#else
int x = 1;
#endif
581
582
583
584
585
586
587
588
])], [ AC_MSG_RESULT([yes]) ],
   [ AC_MSG_RESULT([no])
     AC_MSG_ERROR([Libevent is not new enough.  We require 2.0.10-stable or later]) ] )

LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

589
AC_SUBST(TOR_LIBEVENT_LIBS)
590

591
592
593
594
595
596
597
dnl ------------------------------------------------------
dnl Where do you live, libm?

dnl On some platforms (Haiku/BeOS) the math library is
dnl part of libroot. In which case don't link against lm
TOR_LIB_MATH=""
save_LIBS="$LIBS"
598
599
600
AC_SEARCH_LIBS(pow, [m], , AC_MSG_ERROR([Could not find pow in libm or libc.]))
if test "$ac_cv_search_pow" != "none required"; then
    TOR_LIB_MATH="$ac_cv_search_pow"
601
602
603
604
fi
LIBS="$save_LIBS"
AC_SUBST(TOR_LIB_MATH)

605
dnl ------------------------------------------------------
606
dnl Where do you live, openssl?  And how do we call you?
607

608
tor_openssl_pkg_redhat="openssl"
609
tor_openssl_pkg_debian="libssl-dev"
610
611
612
tor_openssl_devpkg_redhat="openssl-devel"
tor_openssl_devpkg_debian="libssl-dev"

613
614
ALT_openssl_WITHVAL=""
AC_ARG_WITH(ssl-dir,
615
  AS_HELP_STRING(--with-ssl-dir=PATH, [obsolete alias for --with-openssl-dir]),
616
  [
617
      if test "x$withval" != "xno" && test "x$withval" != "x"; then
618
619
620
621
         ALT_openssl_WITHVAL="$withval"
      fi
  ])

622
TOR_SEARCH_LIBRARY(openssl, $tryssldir, [-lssl -lcrypto $TOR_LIB_GDI],
623
624
    [#include <openssl/rand.h>],
    [void RAND_add(const void *buf, int num, double entropy);],
625
    [RAND_add((void*)0,0,0);], [],
626
    [/usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local /usr/athena /opt/openssl])
627

628
629
dnl XXXX check for OPENSSL_VERSION_NUMBER == SSLeay()

630
631
632
633
if test "$enable_static_openssl" = "yes"; then
   if test "$tor_cv_library_openssl_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-openssl-dir=x option when using --enable-static-openssl")
   else
634
     TOR_OPENSSL_LIBS="$TOR_LIBDIR_openssl/libssl.a $TOR_LIBDIR_openssl/libcrypto.a"
635
636
   fi
else
637
     TOR_OPENSSL_LIBS="-lssl -lcrypto"
638
639
640
fi
AC_SUBST(TOR_OPENSSL_LIBS)

641
642
643
644
645
646
647
dnl Now check for particular openssl functions.
save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
save_CPPFLAGS="$CPPFLAGS"
LIBS="$TOR_OPENSSL_LIBS $LIBS"
LDFLAGS="$TOR_LDFLAGS_openssl $LDFLAGS"
CPPFLAGS="$TOR_CPPFLAGS_openssl $CPPFLAGS"
648
649
650

AC_TRY_COMPILE([
#include <openssl/opensslv.h>
651
#if !defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER < 0x1000100fL
652
653
654
#error "too old"
#endif
   ], [],
655
   [ : ],
656
   [ AC_ERROR([OpenSSL is too old. We require 1.0.1 or later. You can specify a path to a newer one with --with-openssl-dir.]) ])
657

658
659
660
661
662
663
664
665
666
667
668
669
670
AC_TRY_COMPILE([
#include <openssl/opensslv.h>
#include <openssl/evp.h>
#if defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_ECDSA)
#error "no ECC"
#endif
#if !defined(NID_X9_62_prime256v1) || !defined(NID_secp224r1)
#error "curves unavailable"
#endif
   ], [],
   [ : ],
   [ AC_ERROR([OpenSSL is built without full ECC support, including curves P256 and P224. You can specify a path to one with ECC support with --with-openssl-dir.]) ])

671
672
673
674
AC_CHECK_MEMBERS([struct ssl_method_st.get_cipher_by_char], , ,
[#include <openssl/ssl.h>
])

675
676
677
678
679
AC_CHECK_FUNCS([ \
		SSL_SESSION_get_master_key \
		SSL_get_server_random \
                SSL_get_client_ciphers \
                SSL_get_client_random \
680
		SSL_CIPHER_find \
681
                SSL_CTX_set_security_level \
682
		TLS_method
683
	       ])
rl1987's avatar
rl1987 committed
684
685
686
687

dnl Check if OpenSSL has scrypt implementation.
AC_CHECK_FUNCS([ EVP_PBE_scrypt ])

688
689
690
691
692
dnl Check if OpenSSL structures are opaque
AC_CHECK_MEMBERS([SSL.state], , ,
[#include <openssl/ssl.h>
])

693
694
695
696
LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

697
698
699
dnl ------------------------------------------------------
dnl Where do you live, zlib?  And how do we call you?

700
701
702
703
tor_zlib_pkg_redhat="zlib"
tor_zlib_pkg_debian="zlib1g"
tor_zlib_devpkg_redhat="zlib-devel"
tor_zlib_devpkg_debian="zlib1g-dev"
704
705
706
707

TOR_SEARCH_LIBRARY(zlib, $tryzlibdir, [-lz],
    [#include <zlib.h>],
    [const char * zlibVersion(void);],
708
    [zlibVersion();], [--with-zlib-dir],
709
710
    [/opt/zlib])

711
712
713
714
715
716
717
718
719
720
721
722
if test "$enable_static_zlib" = "yes"; then
   if test "$tor_cv_library_zlib_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-zlib-dir=x option when
 using --enable-static-zlib")
   else
     TOR_ZLIB_LIBS="$TOR_LIBDIR_zlib/libz.a"
   fi
else
     TOR_ZLIB_LIBS="-lz"
fi
AC_SUBST(TOR_ZLIB_LIBS)

723
724
725
726
727
728
729
730
731
732
733
734
735
dnl ----------------------------------------------------------------------
dnl Check if libcap is available for capabilities.

tor_cap_pkg_debian="libcap2"
tor_cap_pkg_redhat="libcap"
tor_cap_devpkg_debian="libcap-dev"
tor_cap_devpkg_redhat="libcap-devel"

AC_CHECK_LIB([cap], [cap_init], [],
  AC_MSG_NOTICE([Libcap was not found. Capabilities will not be usable.])
)
AC_CHECK_FUNCS(cap_set_proc)

736
737
738
739
740
dnl ---------------------------------------------------------------------
dnl Now that we know about our major libraries, we can check for compiler
dnl and linker hardening options.  We need to do this with the libraries known,
dnl since sometimes the linker will like an option but not be willing to
dnl use it with a build of a library.
741

742
all_ldflags_for_check="$TOR_LDFLAGS_zlib $TOR_LDFLAGS_openssl $TOR_LDFLAGS_libevent"
743
all_libs_for_check="$TOR_ZLIB_LIBS $TOR_LIB_MATH $TOR_LIBEVENT_LIBS $TOR_OPENSSL_LIBS $TOR_SYSTEMD_LIBS $TOR_LIB_WS32 $TOR_LIB_GDI $TOR_CAP_LIBS"
744

745
746
747
748
749
CFLAGS_FTRAPV=
CFLAGS_FWRAPV=
CFLAGS_ASAN=
CFLAGS_UBSAN=

750
751
752
753
754
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !defined(__clang__)
#error
#endif])], have_clang=yes, have_clang=no)

755
if test "x$enable_gcc_hardening" != "xno"; then
756
    CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
757
    if test "x$have_clang" = "xyes"; then
758
759
        TOR_CHECK_CFLAGS(-Qunused-arguments)
    fi
760
761
762
    TOR_CHECK_CFLAGS(-fstack-protector-all, also_link)
    AS_VAR_PUSHDEF([can_compile], [tor_cv_cflags_-fstack-protector-all])
    AS_VAR_PUSHDEF([can_link], [tor_can_link_-fstack-protector-all])
763
m4_ifdef([AS_VAR_IF],[
764
765
766
767
    AS_VAR_IF(can_compile, [yes],
        AS_VAR_IF(can_link, [yes],
                  [],
                  AC_MSG_ERROR([We tried to build with stack protection; it looks like your compiler supports it but your libc does not provide it. Are you missing libssp? (You can --disable-gcc-hardening to ignore this error.)]))
768
        )])
769
770
    AS_VAR_POPDEF([can_link])
    AS_VAR_POPDEF([can_compile])
771
772
    TOR_CHECK_CFLAGS(-Wstack-protector)
    TOR_CHECK_CFLAGS(--param ssp-buffer-size=1)
773
774
775
776
    if test "$bwin32" = "false"; then
       TOR_CHECK_CFLAGS(-fPIE)
       TOR_CHECK_LDFLAGS(-pie, "$all_ldflags_for_check", "$all_libs_for_check")
    fi
777
    TOR_TRY_COMPILE_WITH_CFLAGS(-fwrapv, also_link, CFLAGS_FWRAPV="-fwrapv", true)
778
fi
779

780
if test "x$enable_expensive_hardening" = "xyes"; then
781
782
783
784
785
    TOR_TRY_COMPILE_WITH_CFLAGS(-ftrapv, also_link, CFLAGS_FTRAPV="-ftrapv", true)
   if test "$tor_cv_cflags__ftrapv" = "yes" && test "$tor_can_link__ftrapv" != "yes"; then
      AC_MSG_WARN([The compiler supports -ftrapv, but for some reason I was not able to link with -ftrapv. Are you missing run-time support? Run-time hardening will not work as well as it should.])
   fi

786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
   if test "$tor_cv_cflags__ftrapv" != "yes"; then
     AC_MSG_ERROR([You requested expensive hardening, but the compiler does not seem to support -ftrapv.])
   fi

   TOR_TRY_COMPILE_WITH_CFLAGS([-fsanitize=address], also_link, CFLAGS_ASAN="-fsanitize=address", true)
    if test "$tor_cv_cflags__fsanitize_address" = "yes" && test "$tor_can_link__fsanitize_address" != "yes"; then
      AC_MSG_ERROR([The compiler supports -fsanitize=address, but for some reason I was not able to link when using it. Are you missing run-time support? With GCC you need libubsan.so, and with Clang you need libclang_rt.ubsan*])
    fi

   TOR_TRY_COMPILE_WITH_CFLAGS([-fsanitize=undefined], also_link, CFLAGS_UBSAN="-fsanitize=undefined", true)
    if test "$tor_cv_cflags__fsanitize_address" = "yes" && test "$tor_can_link__fsanitize_address" != "yes"; then
      AC_MSG_ERROR([The compiler supports -fsanitize=undefined, but for some reason I was not able to link when using it. Are you missing run-time support? With GCC you need libasan.so, and with Clang you need libclang_rt.ubsan*])
    fi

TOR_CHECK_CFLAGS([-fno-omit-frame-pointer])
801
802
fi

803
804
805
CFLAGS_BUGTRAP="$CFLAGS_FTRAPV $CFLAGS_ASAN $CFLAGS_UBSAN"
CFLAGS_CONSTTIME="$CFLAGS_FWRAPV"

806
mulodi_fixes_ftrapv=no
807
808
809
810
811
812
813
814
815
816
817
if test "$have_clang" = "yes"; then
  saved_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS $CFLAGS_FTRAPV"
  AC_MSG_CHECKING([whether clang -ftrapv can link a 64-bit int multiply])
  AC_LINK_IFELSE([
      AC_LANG_SOURCE([[
          #include <stdint.h>
          #include <stdlib.h>
	  int main(int argc, char **argv)
	  {
            int64_t x = ((int64_t)atoi(argv[1])) * (int64_t)atoi(argv[2])
818
	                * (int64_t)atoi(argv[3]);
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
	    return x == 9;
	  } ]])],
	  [ftrapv_can_link=yes; AC_MSG_RESULT([yes])],
	  [ftrapv_can_link=no; AC_MSG_RESULT([no])])
  if test "$ftrapv_can_link" = "no"; then
    AC_MSG_CHECKING([whether defining __mulodi4 fixes that])
    AC_LINK_IFELSE([
      AC_LANG_SOURCE([[
          #include <stdint.h>
          #include <stdlib.h>
	  int64_t __mulodi4(int64_t a, int64_t b, int *overflow) {
             *overflow=0;
	     return a;
          }
	  int main(int argc, char **argv)
	  {
            int64_t x = ((int64_t)atoi(argv[1])) * (int64_t)atoi(argv[2])
836
	                * (int64_t)atoi(argv[3]);
837
838
839
840
841
842
843
844
	    return x == 9;
	  } ]])],
	  [mulodi_fixes_ftrapv=yes; AC_MSG_RESULT([yes])],
	  [mulodi_fixes_ftrapv=no; AC_MSG_RESULT([no])])
  fi
  CFLAGS="$saved_CFLAGS"
fi

845
846
AM_CONDITIONAL(ADD_MULODI4, test "$mulodi_fixes_ftrapv" = "yes")

847
848
849
850
851
852
853
854
dnl These cflags add bunches of branches, and we haven't been able to
dnl persuade ourselves that they're suitable for code that needs to be
dnl constant time.
AC_SUBST(CFLAGS_BUGTRAP)
dnl These cflags are variant ones sutable for code that needs to be
dnl constant-time.
AC_SUBST(CFLAGS_CONSTTIME)

855
if test "x$enable_linker_hardening" != "xno"; then
856
857
    TOR_CHECK_LDFLAGS(-z relro -z now, "$all_ldflags_for_check", "$all_libs_for_check")
fi
858

859
860
861
# For backtrace support
TOR_CHECK_LDFLAGS(-rdynamic)

862
dnl ------------------------------------------------------
863
864
865
866
dnl Now see if we have a -fomit-frame-pointer compiler option.

saved_CFLAGS="$CFLAGS"
TOR_CHECK_CFLAGS(-fomit-frame-pointer)
867
F_OMIT_FRAME_POINTER=''
868
if test "$saved_CFLAGS" != "$CFLAGS"; then
869
  if test "x$enable_expensive_hardening" != "xyes"; then
870
871
    F_OMIT_FRAME_POINTER='-fomit-frame-pointer'
  fi
872
873
874
875
fi
CFLAGS="$saved_CFLAGS"
AC_SUBST(F_OMIT_FRAME_POINTER)

876
877
878
879
880
881
882
dnl ------------------------------------------------------
dnl If we are adding -fomit-frame-pointer (or if the compiler's doing it
dnl for us, as GCC 4.6 and later do at many optimization levels), then
dnl we should try to add -fasynchronous-unwind-tables so that our backtrace
dnl code will work.
TOR_CHECK_CFLAGS(-fasynchronous-unwind-tables)

883
884
885
dnl ============================================================
dnl Check for libseccomp

886
887
888
889
if test "x$enable_seccomp" != "xno"; then
  AC_CHECK_HEADERS([seccomp.h])
  AC_SEARCH_LIBS(seccomp_init, [seccomp])
fi
890

891
892
893
894
895
896
dnl ============================================================
dnl Check for libscrypt

if test "x$enable_libscrypt" != "xno"; then
  AC_CHECK_HEADERS([libscrypt.h])
  AC_SEARCH_LIBS(libscrypt_scrypt, [scrypt])
897
  AC_CHECK_FUNCS([libscrypt_scrypt])
898
899
fi

900
901
902
903
904
905
906
907
908
909
dnl ============================================================
dnl We need an implementation of curve25519.

dnl set these defaults.
build_curve25519_donna=no
build_curve25519_donna_c64=no
use_curve25519_donna=no
use_curve25519_nacl=no
CURVE25519_LIBS=

910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
dnl The best choice is using curve25519-donna-c64, but that requires
dnl that we
AC_CACHE_CHECK([whether we can use curve25519-donna-c64],
  tor_cv_can_use_curve25519_donna_c64,
  [AC_RUN_IFELSE(
    [AC_LANG_PROGRAM([dnl
      #include <stdint.h>
      typedef unsigned uint128_t __attribute__((mode(TI)));
  int func(uint64_t a, uint64_t b) {
           uint128_t c = ((uint128_t)a) * b;
           int ok = ((uint64_t)(c>>96)) == 522859 &&
             (((uint64_t)(c>>64))&0xffffffffL) == 3604448702L &&
                 (((uint64_t)(c>>32))&0xffffffffL) == 2351960064L &&
                 (((uint64_t)(c))&0xffffffffL) == 0;
           return ok;
      }
  ], [dnl
    int ok = func( ((uint64_t)2000000000) * 1000000000,
                   ((uint64_t)1234567890) << 24);
        return !ok;
      ])],
  [tor_cv_can_use_curve25519_donna_c64=yes],
      [tor_cv_can_use_curve25519_donna_c64=no],
  [AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([dnl
      #include <stdint.h>
      typedef unsigned uint128_t __attribute__((mode(TI)));
  int func(uint64_t a, uint64_t b) {
           uint128_t c = ((uint128_t)a) * b;
           int ok = ((uint64_t)(c>>96)) == 522859 &&
             (((uint64_t)(c>>64))&0xffffffffL) == 3604448702L &&
                 (((uint64_t)(c>>32))&0xffffffffL) == 2351960064L &&
                 (((uint64_t)(c))&0xffffffffL) == 0;
           return ok;
      }
  ], [dnl
    int ok = func( ((uint64_t)2000000000) * 1000000000,
    	         ((uint64_t)1234567890) << 24);
        return !ok;
      ])],
          [tor_cv_can_use_curve25519_donna_c64=cross],
      [tor_cv_can_use_curve25519_donna_c64=no])])])

AC_CHECK_HEADERS([crypto_scalarmult_curve25519.h \
                  nacl/crypto_scalarmult_curve25519.h])

AC_CACHE_CHECK([for nacl compiled with a fast curve25519 implementation],
  tor_cv_can_use_curve25519_nacl,
  [tor_saved_LIBS="$LIBS"
   LIBS="$LIBS -lnacl"
   AC_LINK_IFELSE(
     [AC_LANG_PROGRAM([dnl
       #ifdef HAVE_CRYPTO_SCALARMULT_CURVE25519_H
       #include <crypto_scalarmult_curve25519.h>
   #elif defined(HAVE_NACL_CRYPTO_SCALARMULT_CURVE25519_H)
   #include <nacl/crypto_scalarmult_curve25519.h>
   #endif
       #ifdef crypto_scalarmult_curve25519_ref_BYTES
   #error Hey, this is the reference implementation! That's not fast.
   #endif
     ], [
   unsigned char *a, *b, *c; crypto_scalarmult_curve25519(a,b,c);
     ])], [tor_cv_can_use_curve25519_nacl=yes],
     [tor_cv_can_use_curve25519_nacl=no])
   LIBS="$tor_saved_LIBS" ])

 dnl Okay, now we need to figure out which one to actually use. Fall back
 dnl to curve25519-donna.c

979
 if test "x$tor_cv_can_use_curve25519_donna_c64" != "xno"; then
980
981
   build_curve25519_donna_c64=yes
   use_curve25519_donna=yes
982
 elif test "x$tor_cv_can_use_curve25519_nacl" = "xyes"; then
983
984
985
986
987
988
   use_curve25519_nacl=yes
   CURVE25519_LIBS=-lnacl
 else
   build_curve25519_donna=yes
   use_curve25519_donna=yes
 fi
989

990
if test "x$use_curve25519_donna" = "xyes"; then
991
992
993
  AC_DEFINE(USE_CURVE25519_DONNA, 1,
            [Defined if we should use an internal curve25519_donna{,_c64} implementation])
fi
994
if test "x$use_curve25519_nacl" = "xyes"; then
995
996
997
  AC_DEFINE(USE_CURVE25519_NACL, 1,
            [Defined if we should use a curve25519 from nacl])
fi
998
999
1000
AM_CONDITIONAL(BUILD_CURVE25519_DONNA,
  test "x$build_curve25519_donna" = "xyes")
AM_CONDITIONAL(BUILD_CURVE25519_DONNA_C64,