configure.ac 71.4 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) 2007-2017, The Tor Project, Inc.
Nick Mathewson's avatar
Nick Mathewson committed
4
dnl See LICENSE for licensing information
5

6
AC_PREREQ([2.63])
7
AC_INIT([tor],[0.3.4.0-alpha-dev])
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

# "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
14
AM_INIT_AUTOMAKE([foreign 1.11 subdir-objects -Wall -Werror])
15

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]))
Nick Mathewson's avatar
Nick Mathewson committed
52
AC_ARG_ENABLE(libfuzzer,
53
54
55
   AS_HELP_STRING(--enable-libfuzzer, [build extra fuzzers based on 'libfuzzer']))
AC_ARG_ENABLE(oss-fuzz,
   AS_HELP_STRING(--enable-oss-fuzz, [build extra fuzzers based on 'oss-fuzz' environment]))
56
57
AC_ARG_ENABLE(memory-sentinels,
   AS_HELP_STRING(--disable-memory-sentinels, [disable code that tries to prevent some kinds of memory access bugs. For fuzzing only.]))
58
59
AC_ARG_ENABLE(rust,
   AS_HELP_STRING(--enable-rust, [enable rust integration]))
60
61
AC_ARG_ENABLE(cargo-online-mode,
   AS_HELP_STRING(--enable-cargo-online-mode, [Allow cargo to make network requests to fetch crates. For builds with rust only.]))
62
63
AC_ARG_ENABLE(restart-debugging,
   AS_HELP_STRING(--enable-restart-debugging, [Build Tor with support for debugging in-process restart. Developers only.]))
64
65
AC_ARG_ENABLE(zstd-advanced-apis,
   AS_HELP_STRING(--disable-zstd-advanced-apis, [Build without support for zstd's "static-only" APIs.]))
66

67
if test "x$enable_coverage" != "xyes" -a "x$enable_asserts_in_tests" = "xno" ; then
68
69
70
    AC_MSG_ERROR([Can't disable assertions outside of coverage build])
fi

71
72
73
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$enable_asserts_in_tests" = "xno")
Nick Mathewson's avatar
Nick Mathewson committed
74
AM_CONDITIONAL(LIBFUZZER_ENABLED, test "x$enable_libfuzzer" = "xyes")
75
AM_CONDITIONAL(OSS_FUZZ_ENABLED, test "x$enable_oss_fuzz" = "xyes")
76
AM_CONDITIONAL(USE_RUST, test "x$enable_rust" = "xyes")
77

78
79
80
81
82
83
if test "$enable_static_tor" = "yes"; then
  enable_static_libevent="yes";
  enable_static_openssl="yes";
  enable_static_zlib="yes";
  CFLAGS="$CFLAGS -static"
fi
84

85
86
87
88
89
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

90
91
92
93
94
if test "$enable_memory_sentinels" = "no"; then
  AC_DEFINE(DISABLE_MEMORY_SENTINELS, 1,
           [Defined if we're turning off memory safety code to look for bugs])
fi

95
AM_CONDITIONAL(USE_OPENBSD_MALLOC, test "x$enable_openbsd_malloc" = "xyes")
96

97
AC_ARG_ENABLE(asciidoc,
98
     AS_HELP_STRING(--disable-asciidoc, [don't use asciidoc (disables building of manpages)]),
99
     [case "${enableval}" in
100
101
        "yes") asciidoc=true ;;
        "no")  asciidoc=false ;;
102
103
104
        *) AC_MSG_ERROR(bad value for --disable-asciidoc) ;;
      esac], [asciidoc=true])

105
106
# systemd notify support
AC_ARG_ENABLE(systemd,
107
      AS_HELP_STRING(--enable-systemd, [enable systemd notification support]),
108
      [case "${enableval}" in
109
110
        "yes") systemd=true ;;
        "no")  systemd=false ;;
111
112
113
        * ) AC_MSG_ERROR(bad value for --enable-systemd) ;;
      esac], [systemd=auto])

114
115
116
117
if test "$enable_restart_debugging" = "yes"; then
  AC_DEFINE(ENABLE_RESTART_DEBUGGING, 1,
            [Defined if we're building with support for in-process restart debugging.])
fi
118

119
120
121
122
if test "$enable_zstd_advanced_apis" != "no"; then
   AC_DEFINE(ENABLE_ZSTD_ADVANCED_APIS, 1,
             [Defined if we're going to try to use zstd's "static-only" APIs.])
fi
123
124

# systemd support
125
if test "x$enable_systemd" = "xno"; then
126
127
128
129
130
131
    have_systemd=no;
else
    PKG_CHECK_MODULES(SYSTEMD,
        [libsystemd-daemon],
        have_systemd=yes,
        have_systemd=no)
132
    if test "x$have_systemd" = "xno"; then
133
134
135
136
137
138
        AC_MSG_NOTICE([Okay, checking for systemd a different way...])
        PKG_CHECK_MODULES(SYSTEMD,
            [libsystemd],
            have_systemd=yes,
            have_systemd=no)
    fi
139
140
fi

141
if test "x$have_systemd" = "xyes"; then
142
    AC_DEFINE(HAVE_SYSTEMD,1,[Have systemd])
143
    TOR_SYSTEMD_CFLAGS="${SYSTEMD_CFLAGS}"
144
    TOR_SYSTEMD_LIBS="${SYSTEMD_LIBS}"
145
    PKG_CHECK_MODULES(LIBSYSTEMD209, [libsystemd >= 209],
146
         [AC_DEFINE(HAVE_SYSTEMD_209,1,[Have systemd v209 or more])], [])
147
fi
148
AC_SUBST(TOR_SYSTEMD_CFLAGS)
149
150
AC_SUBST(TOR_SYSTEMD_LIBS)

151
if test "x$enable_systemd" = "xyes" -a "x$have_systemd" != "xyes" ; then
152
153
154
    AC_MSG_ERROR([Explicitly requested systemd support, but systemd not found])
fi

155
case "$host" in
156
157
158
159
160
   *-*-solaris* )
     AC_DEFINE(_REENTRANT, 1, [Define on some platforms to activate x_r() functions in time.h])
     ;;
esac

161
AC_ARG_ENABLE(gcc-warnings,
162
163
164
     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.]))
165
AC_ARG_ENABLE(gcc-warnings-advisory,
166
     AS_HELP_STRING(--disable-gcc-warnings-advisory, [disable the regular verbose warnings]))
167

168
169
dnl Others suggest '/gs /safeseh /nxcompat /dynamicbase' for non-gcc on Windows
AC_ARG_ENABLE(gcc-hardening,
170
    AS_HELP_STRING(--disable-gcc-hardening, [disable compiler security checks]))
171

172
dnl Deprecated --enable-expensive-hardening but keep it for now for backward compat.
173
AC_ARG_ENABLE(expensive-hardening,
174
175
176
177
178
179
    AS_HELP_STRING(--enable-expensive-hardening, [enable more fragile and expensive compiler hardening; makes Tor slower]))
AC_ARG_ENABLE(fragile-hardening,
    AS_HELP_STRING(--enable-fragile-hardening, [enable more fragile and expensive compiler hardening; makes Tor slower]))
if test "x$enable_expensive_hardening" = "xyes" || test "x$enable_fragile_hardening" = "xyes"; then
  fragile_hardening="yes"
fi
180

181
182
183
dnl Linker hardening options
dnl Currently these options are ELF specific - you can't use this with MacOSX
AC_ARG_ENABLE(linker-hardening,
184
    AS_HELP_STRING(--disable-linker-hardening, [disable linker security fixups]))
185

186
AC_ARG_ENABLE(local-appdata,
187
   AS_HELP_STRING(--enable-local-appdata, [default to host local application data paths on Windows]))
188
189
190
191
192
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

193
194
# Tor2web mode flag
AC_ARG_ENABLE(tor2web-mode,
195
     AS_HELP_STRING(--enable-tor2web-mode, [support tor2web non-anonymous mode]),
196
[if test "x$enableval" = "xyes"; then
197
198
199
    CFLAGS="$CFLAGS -D ENABLE_TOR2WEB_MODE=1"
fi])

200
AC_ARG_ENABLE(tool-name-check,
201
     AS_HELP_STRING(--disable-tool-name-check, [check for sanely named toolchain when cross-compiling]))
202

203
AC_ARG_ENABLE(seccomp,
204
     AS_HELP_STRING(--disable-seccomp, [do not attempt to use libseccomp]))
205

206
AC_ARG_ENABLE(libscrypt,
207
     AS_HELP_STRING(--disable-libscrypt, [do not attempt to use libscrypt]))
208

209
210
211
212
213
214
215
216
217
218
dnl Enable event tracing which are transformed to debug log statement.
AC_ARG_ENABLE(event-tracing-debug,
     AS_HELP_STRING(--enable-event-tracing-debug, [build with event tracing to debug log]))
AM_CONDITIONAL([USE_EVENT_TRACING_DEBUG], [test "x$enable_event_tracing_debug" = "xyes"])

if test x$enable_event_tracing_debug = xyes; then
  AC_DEFINE([USE_EVENT_TRACING_DEBUG], [1], [Tracing framework to log debug])
  AC_DEFINE([TOR_EVENT_TRACING_ENABLED], [1], [Compile the event tracing instrumentation])
fi

219
220
221
222
223
224
225
226
227
228
229
230
231
232
dnl Enable Android only features.
AC_ARG_ENABLE(android,
     AS_HELP_STRING(--enable-android, [build with Android features enabled]))
AM_CONDITIONAL([USE_ANDROID], [test "x$enable_android" = "xyes"])

if test "x$enable_android" = "xyes"; then
  AC_DEFINE([USE_ANDROID], [1], [Compile with Android specific features enabled])

  dnl Check if the Android log library is available.
  AC_CHECK_HEADERS([android/log.h])
  AC_SEARCH_LIBS(__android_log_write, [log])

fi

233
234
235
236
237
238
239
240
241
dnl check for the correct "ar" when cross-compiling.
dnl   (AM_PROG_AR was new in automake 1.11.2, which we do not yet require,
dnl    so kludge up a replacement for the case where it isn't there yet.)
m4_ifdef([AM_PROG_AR],
         [AM_PROG_AR],
         [AN_MAKEVAR([AR], [AC_PROG_AR])
          AN_PROGRAM([ar], [AC_PROG_AR])
          AC_DEFUN([AC_PROG_AR], [AC_CHECK_TOOL([AR], [ar], [:])])
          AC_PROG_AR])
242

243
244
245
246
247
248
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.
249
250
if test "x$enable_tool_name_check" != "xno"; then
    if test "x$ac_tool_warned" = "xyes"; then
251
        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.)])
252
	elif test "x$ac_ct_AR" != "x" -a "x$cross_compiling" = "xmaybe"; then
253
254
255
256
		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

257
AC_PROG_CC
258
AC_PROG_CPP
259
260
AC_PROG_MAKE_SET
AC_PROG_RANLIB
261
AC_PROG_SED
262

263
264
265
AC_ARG_VAR([PERL], [path to Perl binary])
AC_CHECK_PROGS([PERL], [perl])
AM_CONDITIONAL(USE_PERL, [test "x$ac_cv_prog_PERL" != "x"])
266

267
268
dnl check for asciidoc and a2x
AC_PATH_PROG([ASCIIDOC], [asciidoc], none)
269
AC_PATH_PROGS([A2X], [a2x a2x.py], none)
270

271
AM_CONDITIONAL(USE_ASCIIDOC, test "x$asciidoc" = "xtrue")
272

273
AM_PROG_CC_C_O
274
AC_PROG_CC_C99
275

276
AC_ARG_VAR([PYTHON], [path to Python binary])
277
AC_CHECK_PROGS(PYTHON, [python python2 python2.7 python3 python3.3])
278
279
280
281
282
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"])

283
dnl List all external rust crates we depend on here. Include the version
284
rust_crates="libc-0.2.39"
285
AC_SUBST(rust_crates)
286

287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
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])])
302
 if test "$tor_cv_flexarray" = "yes"; then
303
   AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [], [Define to nothing if C supports flexible array members, and to 1 if it does not.])
304
 else
305
   AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [1], [Define to nothing if C supports flexible array members, and to 1 if it does not.])
306
307
308
 fi
])

309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
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

331
332
TORUSER=_tor
AC_ARG_WITH(tor-user,
333
        AS_HELP_STRING(--with-tor-user=NAME, [specify username for tor daemon]),
334
335
336
337
338
339
340
341
        [
           TORUSER=$withval
        ]
)
AC_SUBST(TORUSER)

TORGROUP=_tor
AC_ARG_WITH(tor-group,
342
        AS_HELP_STRING(--with-tor-group=NAME, [specify group name for tor daemon]),
343
344
345
346
347
348
        [
           TORGROUP=$withval
        ]
)
AC_SUBST(TORGROUP)

349

350
dnl If _WIN32 is defined and non-zero, we are building for win32
351
AC_MSG_CHECKING([for win32])
352
AC_RUN_IFELSE([AC_LANG_SOURCE([
353
int main(int c, char **v) {
354
355
#ifdef _WIN32
#if _WIN32
356
357
358
359
360
361
362
  return 0;
#else
  return 1;
#endif
#else
  return 2;
#endif
363
}])],
364
bwin32=true; AC_MSG_RESULT([yes]),
365
366
bwin32=false; AC_MSG_RESULT([no]),
bwin32=cross; AC_MSG_RESULT([cross])
367
368
)

369
if test "$bwin32" = "cross"; then
370
AC_MSG_CHECKING([for win32 (cross)])
371
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
372
#ifdef _WIN32
373
374
375
376
377
int main(int c, char **v) {return 0;}
#else
#error
int main(int c, char **v) {return x(y);}
#endif
378
])],
379
380
381
382
bwin32=true; AC_MSG_RESULT([yes]),
bwin32=false; AC_MSG_RESULT([no]))
fi

383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
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
402

403
AM_CONDITIONAL(BUILD_NT_SERVICES, test "x$bwin32" = "xtrue")
404
AM_CONDITIONAL(BUILD_LIBTORRUNNER, test "x$bwin32" != "xtrue")
405

406
407
dnl Enable C99 when compiling with MIPSpro
AC_MSG_CHECKING([for MIPSpro compiler])
408
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [
409
410
411
412
#if (defined(__sgi) && defined(_COMPILER_VERSION))
#error
  return x(y);
#endif
413
])],
414
bmipspro=false; AC_MSG_RESULT(no),
415
bmipspro=true; AC_MSG_RESULT(yes))
416

417
if test "$bmipspro" = "true"; then
418
419
420
  CFLAGS="$CFLAGS -c99"
fi

421
422
AC_C_BIGENDIAN

423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
if test "x$enable_rust" = "xyes"; then
  AC_ARG_VAR([RUSTC], [path to the rustc binary])
  AC_CHECK_PROG([RUSTC], [rustc], [rustc],[no])
  if test "x$RUSTC" = "xno"; then
    AC_MSG_ERROR([rustc unavailable but rust integration requested.])
  fi

  AC_ARG_VAR([CARGO], [path to the cargo binary])
  AC_CHECK_PROG([CARGO], [cargo], [cargo],[no])
  if test "x$CARGO" = "xno"; then
    AC_MSG_ERROR([cargo unavailable but rust integration requested.])
  fi

  AC_DEFINE([HAVE_RUST], 1, [have Rust])
  if test "x$enable_cargo_online_mode" = "xyes"; then
    CARGO_ONLINE=
    RUST_DL=#
  else
    CARGO_ONLINE=--frozen
    RUST_DL=

    dnl When we're not allowed to touch the network, we need crate dependencies
    dnl locally available.
    AC_MSG_CHECKING([rust crate dependencies])
447
448
    AC_ARG_VAR([TOR_RUST_DEPENDENCIES], [path to directory with local crate mirror])
    if test "x$TOR_RUST_DEPENDENCIES" = "x"; then
449
      TOR_RUST_DEPENDENCIES="${srcdir}/src/ext/rust/crates"
450
    fi
451
    dnl Check whether the path exists before we try to cd into it.
452
453
    if test ! -d "$TOR_RUST_DEPENDENCIES"; then
      AC_MSG_ERROR([Rust dependency directory $TOR_RUST_DEPENDENCIES does not exist. Specify a dependency directory using the TOR_RUST_DEPENDENCIES variable or allow cargo to fetch crates using --enable-cargo-online-mode.])
454
      ERRORED=1
455
    fi
456
457
458
459
    dnl Make the path absolute, since we'll be using it from within a
    dnl subdirectory.
    TOR_RUST_DEPENDENCIES=$(cd "$TOR_RUST_DEPENDENCIES" ; pwd)

460
    for dep in $rust_crates; do
461
462
      if test ! -d "$TOR_RUST_DEPENDENCIES"/"$dep"; then
        AC_MSG_ERROR([Failure to find rust dependency $TOR_RUST_DEPENDENCIES/$dep. Specify a dependency directory using the TOR_RUST_DEPENDENCIES variable or allow cargo to fetch crates using --enable-cargo-online-mode.])
463
        ERRORED=1
464
465
      fi
    done
466
467
468
    if test "x$ERRORED" = "x"; then
      AC_MSG_RESULT([yes])
    fi
469
470
  fi

471
472
473
474
475
476
477
478
479
  dnl This is a workaround for #46797
  dnl (a.k.a https://github.com/rust-lang/rust/issues/46797 ).  Once the
  dnl upstream bug is fixed, we can remove this workaround.
  case "$host_os" in
      darwin*)
        TOR_RUST_EXTRA_LIBS="-lresolv"
	;;
  esac

480
481
482
  dnl For now both MSVC and MinGW rust libraries will output static libs with
  dnl the MSVC naming convention.
  if test "$bwin32" = "true"; then
483
    TOR_RUST_STATIC_NAME=tor_rust.lib
484
  else
485
    TOR_RUST_STATIC_NAME=libtor_rust.a
486
487
  fi

488
  AC_SUBST(TOR_RUST_STATIC_NAME)
489
490
491
492
493
  AC_SUBST(CARGO_ONLINE)
  AC_SUBST(RUST_DL)

  dnl Let's check the rustc version, too
  AC_MSG_CHECKING([rust version])
494
  RUSTC_VERSION=`$RUSTC --version`
495
496
497
498
499
500
501
502
  RUSTC_VERSION_MAJOR=`$RUSTC --version | cut -d ' ' -f 2 | cut -d '.' -f 1`
  RUSTC_VERSION_MINOR=`$RUSTC --version | cut -d ' ' -f 2 | cut -d '.' -f 2`
  if test "x$RUSTC_VERSION_MAJOR" = "x" -o "x$RUSTC_VERSION_MINOR" = "x"; then
    AC_MSG_ERROR([rustc version couldn't be identified])
  fi
  if test "$RUSTC_VERSION_MAJOR" -lt 2 -a "$RUSTC_VERSION_MINOR" -lt 14; then
    AC_MSG_ERROR([rustc must be at least version 1.14])
  fi
503
  AC_MSG_RESULT([$RUSTC_VERSION])
504
505
fi

506
507
AC_SUBST(TOR_RUST_EXTRA_LIBS)

508
AC_SEARCH_LIBS(socket, [socket network])
509
AC_SEARCH_LIBS(gethostbyname, [nsl])
510
AC_SEARCH_LIBS(dlopen, [dl])
511
AC_SEARCH_LIBS(inet_aton, [resolv])
512
AC_SEARCH_LIBS(backtrace, [execinfo])
513
514
515
516
517
518
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
519

520
521
AC_SEARCH_LIBS(pthread_create, [pthread])
AC_SEARCH_LIBS(pthread_detach, [pthread])
522

523
524
AM_CONDITIONAL(THREADS_WIN32, test "$bwin32" = "true")
AM_CONDITIONAL(THREADS_PTHREADS, test "$bwin32" = "false")
525

526
AC_CHECK_FUNCS(
527
        _NSGetEnviron \
528
529
	RtlSecureZeroMemory \
	SecureZeroMemory \
Sebastian Hahn's avatar
Sebastian Hahn committed
530
        accept4 \
Nick Mathewson's avatar
Nick Mathewson committed
531
532
        backtrace \
        backtrace_symbols_fd \
533
	eventfd \
534
	explicit_bzero \
535
	timingsafe_memcmp \
536
537
        flock \
        ftime \
538
        get_current_dir_name \
539
        getaddrinfo \
Sebastian Hahn's avatar
Sebastian Hahn committed
540
        getifaddrs \
541
        getpass \
542
543
544
        getrlimit \
        gettimeofday \
        gmtime_r \
545
	gnu_get_libc_version \
546
	htonll \
547
        inet_aton \
Sebastian Hahn's avatar
Sebastian Hahn committed
548
        ioctl \
549
        issetugid \
550
        llround \
551
        localtime_r \
Sebastian Hahn's avatar
Sebastian Hahn committed
552
        lround \
553
	mach_approximate_time \
554
        memmem \
555
        memset_s \
556
        mmap \
557
558
	pipe \
	pipe2 \
559
        prctl \
560
	readpassphrase \
Sebastian Hahn's avatar
Sebastian Hahn committed
561
        rint \
Nick Mathewson's avatar
Nick Mathewson committed
562
        sigaction \
563
        socketpair \
564
	statvfs \
565
566
        strlcat \
        strlcpy \
567
	strnlen \
568
569
570
571
        strptime \
        strtok_r \
        strtoull \
        sysconf \
572
	sysctl \
Nick Mathewson's avatar
Nick Mathewson committed
573
	truncate \
574
        uname \
575
	usleep \
576
        vasprintf \
577
	_vscprintf
578
)
579

580
581
582
# 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
583
# are not targeting OSX 10.11 or earlier.
584
AC_MSG_CHECKING([for a pre-Sierra OSX build target])
585
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
586
587
#ifdef __APPLE__
#  include <AvailabilityMacros.h>
588
589
#  ifndef MAC_OS_X_VERSION_10_12
#    define MAC_OS_X_VERSION_10_12 101200
590
591
#  endif
#  if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
592
#    if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
593
594
595
596
#      error "Running on Mac OSX 10.11 or earlier"
#    endif
#  endif
#endif
597
]], [[]])],
598
599
600
601
602
603
604
605
606
607
   [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

608
if test "$bwin32" != "true"; then
609
610
  AC_CHECK_HEADERS(pthread.h)
  AC_CHECK_FUNCS(pthread_create)
611
  AC_CHECK_FUNCS(pthread_condattr_setclock)
612
613
fi

614
if test "$bwin32" = "true"; then
615
616
617
618
619
620
621
  AC_CHECK_DECLS([SecureZeroMemory, _getwch], , , [
#include <windows.h>
#include <conio.h>
#include <wchar.h>
                 ])
fi

622
623
AM_CONDITIONAL(BUILD_READPASSPHRASE_C,
  test "x$ac_cv_func_readpassphrase" = "xno" && test "$bwin32" = "false")
624

625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
AC_MSG_CHECKING([whether free(NULL) works])
AC_RUN_IFELSE([AC_LANG_PROGRAM([
  #include <stdlib.h>
], [
char *p = NULL;
free(p);
])],
[free_null_ok=true; AC_MSG_RESULT(yes)],
[free_null_ok=false; AC_MSG_RESULT(no)],
[free_null_ok=cross; AC_MSG_RESULT(cross)])

if test "$free_null_ok" = "false"; then
   AC_MSG_ERROR([Your libc implementation doesn't allow free(NULL), as required by C99.])
fi

640
dnl ------------------------------------------------------
641
dnl Where do you live, libevent?  And how do we call you?
642

643
if test "$bwin32" = "true"; then
644
  TOR_LIB_WS32=-lws2_32
645
  TOR_LIB_IPHLPAPI=-liphlpapi
646
647
  # Some of the cargo-cults recommend -lwsock32 as well, but I don't
  # think it's actually necessary.
648
  TOR_LIB_GDI=-lgdi32
649
  TOR_LIB_USERENV=-luserenv
Nick Mathewson's avatar
   
Nick Mathewson committed
650
else
651
652
  TOR_LIB_WS32=
  TOR_LIB_GDI=
653
  TOR_LIB_USERENV=
Nick Mathewson's avatar
   
Nick Mathewson committed
654
fi
655
656
AC_SUBST(TOR_LIB_WS32)
AC_SUBST(TOR_LIB_GDI)
657
AC_SUBST(TOR_LIB_IPHLPAPI)
658
AC_SUBST(TOR_LIB_USERENV)
Nick Mathewson's avatar
   
Nick Mathewson committed
659

660
tor_libevent_pkg_redhat="libevent"
661
tor_libevent_pkg_debian="libevent-dev"
662
663
664
tor_libevent_devpkg_redhat="libevent-devel"
tor_libevent_devpkg_debian="libevent-dev"

665
666
667
668
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 "$enable_static_libevent" = "yes"; then
669
    if test "$have_rt" = "yes"; then
670
671
672
673
674
      STATIC_LIBEVENT_FLAGS=" -lrt "
    fi
fi

TOR_SEARCH_LIBRARY(libevent, $trylibeventdir, [-levent $STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32], [
675
#ifdef _WIN32
676
677
#include <winsock2.h>
#endif
678
#include <sys/time.h>
Roger Dingledine's avatar
Roger Dingledine committed
679
#include <sys/types.h>
680
#include <event2/event.h>], [
681
#ifdef _WIN32
682
683
#include <winsock2.h>
#endif
684
struct event_base;
685
686
struct event_base *event_base_new(void);
void event_base_free(struct event_base *);],
687
    [
688
#ifdef _WIN32
689
{WSADATA d; WSAStartup(0x101,&d); }
690
#endif
Alex Xu's avatar
Alex Xu committed
691
event_base_free(event_base_new());
692
], [--with-libevent-dir], [/opt/libevent])
693

694
dnl Determine the incantation needed to link libevent.
695
696
save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
697
save_CPPFLAGS="$CPPFLAGS"
698
699

LIBS="$STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32 $save_LIBS"
700
LDFLAGS="$TOR_LDFLAGS_libevent $LDFLAGS"
701
CPPFLAGS="$TOR_CPPFLAGS_libevent $CPPFLAGS"
702

703
704
AC_CHECK_HEADERS(event2/event.h event2/dns.h event2/bufferevent_ssl.h)

705
706
707
708
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
709
     TOR_LIBEVENT_LIBS="$TOR_LIBDIR_libevent/libevent.a $STATIC_LIBEVENT_FLAGS"
710
711
   fi
else
712
     if test "x$ac_cv_header_event2_event_h" = "xyes"; then
Nick Mathewson's avatar
Nick Mathewson committed
713
714
       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"))
715

716
       if test "$ac_cv_search_event_new" != "none required"; then
717
718
         TOR_LIBEVENT_LIBS="$ac_cv_search_event_new"
       fi
719
       if test "$ac_cv_search_evdns_base_new" != "none required"; then
720
721
722
         TOR_LIBEVENT_LIBS="$ac_cv_search_evdns_base_new $TOR_LIBEVENT_LIBS"
       fi
     else
723
       AC_MSG_ERROR("libevent2 is required but the headers could not be found")
724
     fi
725
726
fi

727
728
729
730
731
dnl Now check for particular libevent functions.
AC_CHECK_FUNCS([evutil_secure_rng_set_urandom_device_file \
                evutil_secure_rng_add_bytes \
])

732
733
734
735
LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

736
737
738
739
740
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([
741
#include <event2/event.h>
742
#if !defined(LIBEVENT_VERSION_NUMBER) || LIBEVENT_VERSION_NUMBER < 0x02000a00
743
744
745
746
747
#error
int x = y(zz);
#else
int x = 1;
#endif
748
749
750
751
752
753
754
755
])], [ 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"

756
AC_SUBST(TOR_LIBEVENT_LIBS)
757

758
759
760
761
762
763
764
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="$LIBS"
765
766
767
AC_SEARCH_LIBS(pow, [m], , AC_MSG_ERROR([Could not find pow in libm or libc.]))
if test "$ac_cv_search_pow" != "none required"; then
    TOR_LIB_MATH="$ac_cv_search_pow"
768
769
770
771
fi
LIBS="$save_LIBS"
AC_SUBST(TOR_LIB_MATH)

772
dnl ------------------------------------------------------
773
dnl Where do you live, openssl?  And how do we call you?
774

775
tor_openssl_pkg_redhat="openssl"
776
tor_openssl_pkg_debian="libssl-dev"
777
778
779
tor_openssl_devpkg_redhat="openssl-devel"
tor_openssl_devpkg_debian="libssl-dev"

780
781
ALT_openssl_WITHVAL=""
AC_ARG_WITH(ssl-dir,
782
  AS_HELP_STRING(--with-ssl-dir=PATH, [obsolete alias for --with-openssl-dir]),
783
  [
784
      if test "x$withval" != "xno" && test "x$withval" != "x"; then
785
786
787
788
         ALT_openssl_WITHVAL="$withval"
      fi
  ])

789
AC_MSG_NOTICE([Now, we'll look for OpenSSL >= 1.0.1])
790
TOR_SEARCH_LIBRARY(openssl, $tryssldir, [-lssl -lcrypto $TOR_LIB_GDI $TOR_LIB_WS32],
791
792
793
    [#include <openssl/ssl.h>],
    [struct ssl_method_st; const struct ssl_method_st *TLSv1_1_method(void);],
    [TLSv1_1_method();], [],
794
    [/usr/local/opt/openssl /usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local /opt/openssl])
795

796
797
dnl XXXX check for OPENSSL_VERSION_NUMBER == SSLeay()

798
799
800
801
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
802
     TOR_OPENSSL_LIBS="$TOR_LIBDIR_openssl/libssl.a $TOR_LIBDIR_openssl/libcrypto.a"
803
804
   fi
else
805
     TOR_OPENSSL_LIBS="-lssl -lcrypto"
806
807
808
fi
AC_SUBST(TOR_OPENSSL_LIBS)

809
810
811
812
813
814
815
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"
816

817
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
818
#include <openssl/opensslv.h>
819
#if !defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER < 0x1000100fL
820
821
#error "too old"
#endif
822
   ]], [[]])],
823
   [ : ],
824
   [ AC_MSG_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.]) ])
825

826
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
827
828
829
830
831
832
833
834
#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
835
   ]], [[]])],
836
   [ : ],
837
   [ AC_MSG_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.]) ])
838

839
840
841
842
AC_CHECK_MEMBERS([struct ssl_method_st.get_cipher_by_char], , ,
[#include <openssl/ssl.h>
])

843
844
845
846
847
AC_CHECK_FUNCS([ \
		SSL_SESSION_get_master_key \
		SSL_get_server_random \
                SSL_get_client_ciphers \
                SSL_get_client_random \
848
		SSL_CIPHER_find \
849
		TLS_method
850
	       ])
rl1987's avatar
rl1987 committed
851
852
853
854

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

855
856
857
858
859
dnl Check if OpenSSL structures are opaque
AC_CHECK_MEMBERS([SSL.state], , ,
[#include <openssl/ssl.h>
])

860
861
862
863
AC_CHECK_SIZEOF(SHA_CTX, , [AC_INCLUDES_DEFAULT()
#include <openssl/sha.h>
])

864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
dnl Define the set of checks for KIST scheduler support.
AC_DEFUN([CHECK_KIST_SUPPORT],[
  dnl KIST needs struct tcp_info and for certain members to exist.
  AC_CHECK_MEMBERS(
    [struct tcp_info.tcpi_unacked, struct tcp_info.tcpi_snd_mss],
    , ,[[#include <netinet/tcp.h>]])
  dnl KIST needs SIOCOUTQNSD to exist for an ioctl call.
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
                     #include <linux/sockios.h>
                     #ifndef SIOCOUTQNSD
                     #error
                     #endif
                     ])], have_siocoutqnsd=yes, have_siocoutqnsd=no)
  if test "x$have_siocoutqnsd" = "xyes"; then
    if test "x$ac_cv_member_struct_tcp_info_tcpi_unacked" = "xyes"; then
      if test "x$ac_cv_member_struct_tcp_info_tcpi_snd_mss" = "xyes"; then
        have_kist_support=yes
      fi
    fi
  fi
])
dnl Now, trigger the check.
CHECK_KIST_SUPPORT
AS_IF([test "x$have_kist_support" = "xyes"],
      [AC_DEFINE(HAVE_KIST_SUPPORT, 1, [Defined if KIST scheduler is supported
                                        on this system])],
      [AC_MSG_NOTICE([KIST scheduler can't be used. Missing support.])])

892
893
894
895
LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

896
897
898
dnl ------------------------------------------------------
dnl Where do you live, zlib?  And how do we call you?

899
900
901
902
tor_zlib_pkg_redhat="zlib"
tor_zlib_pkg_debian="zlib1g"
tor_zlib_devpkg_redhat="zlib-devel"
tor_zlib_devpkg_debian="zlib1g-dev"
903
904
905
906

TOR_SEARCH_LIBRARY(zlib, $tryzlibdir, [-lz],
    [#include <zlib.h>],
    [const char * zlibVersion(void);],
907
    [zlibVersion();], [--with-zlib-dir],
908
909
    [/opt/zlib])

910
911
912
913
914
915
916
917
918
919
920
921
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)

922
923
924
925
dnl ------------------------------------------------------
dnl Where we do we find lzma?

AC_ARG_ENABLE(lzma,
Taylor Yu's avatar
Taylor Yu committed
926
      AS_HELP_STRING(--enable-lzma, [enable support for the LZMA compression scheme.]),
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
      [case "${enableval}" in
        "yes") lzma=true ;;
        "no")  lzma=false ;;
        * ) AC_MSG_ERROR(bad value for --enable-lzma) ;;
      esac], [lzma=auto])

if test "x$enable_lzma" = "xno"; then
    have_lzma=no;
else
    PKG_CHECK_MODULES([LZMA],
                      [liblzma],
                      have_lzma=yes,
                      have_lzma=no)

    if test "x$have_lzma" = "xno" ; then
        AC_MSG_WARN([Unable to find liblzma.])
    fi
fi

if test "x$have_lzma" = "xyes"; then
    AC_DEFINE(HAVE_LZMA,1,[Have LZMA])
    TOR_LZMA_CFLAGS="${LZMA_CFLAGS}"
    TOR_LZMA_LIBS="${LZMA_LIBS}"
fi
AC_SUBST(TOR_LZMA_CFLAGS)
AC_SUBST(TOR_LZMA_LIBS)

954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
dnl ------------------------------------------------------
dnl Where we do we find zstd?

AC_ARG_ENABLE(zstd,
      AS_HELP_STRING(--enable-zstd, [enable support for the Zstandard compression scheme.]),
      [case "${enableval}" in
        "yes") zstd=true ;;
        "no")  zstd=false ;;
        * ) AC_MSG_ERROR(bad value for --enable-zstd) ;;
      esac], [zstd=auto])

if test "x$enable_zstd" = "xno"; then
    have_zstd=no;
else
    PKG_CHECK_MODULES([ZSTD],
Taylor Yu's avatar
Taylor Yu committed
969
                      [libzstd >= 1.1],
970
971
972
973
974
975
976
977
978
979
980
981
                      have_zstd=yes,
                      have_zstd=no)

    if test "x$have_zstd" = "xno" ; then
        AC_MSG_WARN([Unable to find libzstd.])
    fi
fi

if test "x$have_zstd" = "xyes"; then
    AC_DEFINE(HAVE_ZSTD,1,[Have Zstd])
    TOR_ZSTD_CFLAGS="${ZSTD_CFLAGS}"
    TOR_ZSTD_LIBS="${ZSTD_LIBS}"
982
983
984
985
986
987
988
989
990
991

    dnl now check for zstd functions
    save_LIBS="$LIBS"
    save_CFLAGS="$CFLAGS"
    LIBS="$LIBS $ZSTD_LIBS"
    CFLAGS="$CFLAGS $ZSTD_CFLAGS"
    AC_CHECK_FUNCS(ZSTD_estimateCStreamSize \
                   ZSTD_estimateDCtxSize)
    LIBS="$save_LIBS"
    CFLAGS="$save_CFLAGS"
992
993
994
995
fi
AC_SUBST(TOR_ZSTD_CFLAGS)
AC_SUBST(TOR_ZSTD_LIBS)

996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
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)

1009
1010
1011
1012
1013
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.
1014

1015
all_ldflags_for_check="$TOR_LDFLAGS_zlib $TOR_LDFLAGS_openssl $TOR_LDFLAGS_libevent"
1016
all_libs_for_check="$TOR_ZLIB_LIBS $TOR_LIB_MATH $TOR_LIBEVENT_LIBS $TOR_OPENSSL_LIBS $TOR_SYSTEMD_LIBS $TOR_LIB_WS32 $TOR_LIB_GDI $TOR_LIB_USERENV $TOR_CAP_LIBS"
1017

1018
1019
1020
1021
1022
CFLAGS_FTRAPV=
CFLAGS_FWRAPV=
CFLAGS_ASAN=
CFLAGS_UBSAN=

Nick Mathewson's avatar
Nick Mathewson committed
1023

1024
1025
1026
1027
1028
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !defined(__clang__)
#error
#endif])], have_clang=yes, have_clang=no)

1029
if test "x$enable_gcc_hardening" != "xno"; then
1030
    CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
1031
    if test "x$have_clang" = "xyes"; then
1032
1033
        TOR_CHECK_CFLAGS(-Qunused-arguments)
    fi
1034
1035
1036
    TOR_CHECK_CFLAGS(-fstack-protector-all, also_link)
    AS_VAR_PUSHDEF([can_compile], [tor_cv_cflags_-fstack-protector-all])
    AS_VAR_PUSHDEF([can_link], [tor_can_link_-fstack-protector-all])
1037
m4_ifdef([AS_VAR_IF],[
1038
1039
1040
1041
    AS_VAR_IF(can_compile, [yes],
        AS_VAR_IF(can_link, [yes],
                  [],
                  AC_MSG_ERROR([We tried to build with stack protection; it looks like your compiler supports it but your libc does not provide it. Are you missing libssp? (You can --disable-gcc-hardening to ignore this error.)]))
1042
        )])
1043
1044
    AS_VAR_POPDEF([can_link])
    AS_VAR_POPDEF([can_compile])
1045
1046
    TOR_CHECK_CFLAGS(-Wstack-protector)
    TOR_CHECK_CFLAGS(--param ssp-buffer-size=1)
Nick Mathewson's avatar
Nick Mathewson committed
1047
    if test "$bwin32" = "false" && test "$enable_libfuzzer" != "yes" && test "$enable_oss_fuzz" != "yes"; then
1048
1049
1050
       TOR_CHECK_CFLAGS(-fPIE)
       TOR_CHECK_LDFLAGS(-pie, "$all_ldflags_for_check", "$all_libs_for_check")
    fi
1051
    TOR_TRY_COMPILE_WITH_CFLAGS(-fwrapv, also_link, CFLAGS_FWRAPV="-fwrapv", true)
1052
fi
1053

1054
if test "$fragile_hardening" = "yes"; then
1055
1056
1057
1058
1059
    TOR_TRY_COMPILE_WITH_CFLAGS(-ftrapv, also_link, CFLAGS_FTRAPV="-ftrapv", true)
   if test "$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

1060
   if test "$tor_cv_cflags__ftrapv" != "yes"; then
1061
     AC_MSG_ERROR([You requested fragile hardening, but the compiler does not seem to support -ftrapv.])
1062
1063
1064
1065
   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
1066
      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.*, and with Clang you need libclang_rt.ubsan*])
1067
1068
1069
1070
    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
1071
      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.*, and with Clang you need libclang_rt.ubsan*])
1072
1073
1074
    fi

TOR_CHECK_CFLAGS([-fno-omit-frame-pointer])
1075
1076
fi

1077
1078
1079
CFLAGS_BUGTRAP="$CFLAGS_FTRAPV $CFLAGS_ASAN $CFLAGS_UBSAN"
CFLAGS_CONSTTIME="$CFLAGS_FWRAPV"

1080
mulodi_fixes_ftrapv=no
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
if test "$have_clang" = "yes"; then
  saved_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS $CFLAGS_FTRAPV"
  AC_MSG_CHECKING([whether clang -ftrapv can link a 64-bit int multiply])
  AC_LINK_IFELSE([
      AC_LANG_SOURCE([[
          #include <stdint.h>
          #include <stdlib.h>
	  int main(int argc, char **argv)
	  {
            int64_t x = ((int64_t)atoi(argv[1])) * (int64_t)atoi(argv[2])
1092
	                * (int64_t)atoi(argv[3]);
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
	    return x == 9;
	  } ]])],
	  [ftrapv_can_link=yes; AC_MSG_RESULT([yes])],
	  [ftrapv_can_link=no; AC_MSG_RESULT([no])])
  if test "$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])
1110
	                * (int64_t)atoi(argv[3]);
1111
1112
1113
1114
1115
1116
1117
1118
	    return x == 9;
	  } ]])],
	  [mulodi_fixes_ftrapv=yes; AC_MSG_RESULT([yes])],
	  [mulodi_fixes_ftrapv=no; AC_MSG_RESULT([no])])
  fi
  CFLAGS="$saved_CFLAGS"
fi

1119
1120
AM_CONDITIONAL(ADD_MULODI4, test "$mulodi_fixes_ftrapv" = "yes")

1121
1122
1123
1124
1125
1126
1127
1128
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)