1AC_DEFUN([CHECK_LIBC_COMPAT], [
2# Check for libc headers
3AC_CHECK_HEADERS([err.h readpassphrase.h])
4# Check for general libc functions
5AC_CHECK_FUNCS([asprintf freezero memmem])
6AC_CHECK_FUNCS([readpassphrase reallocarray recallocarray])
7AC_CHECK_FUNCS([strlcat strlcpy strndup strnlen strsep strtonum])
8AC_CHECK_FUNCS([timegm _mkgmtime timespecsub])
9AC_CHECK_FUNCS([getprogname syslog syslog_r])
10AC_CACHE_CHECK([for getpagesize], ac_cv_func_getpagesize, [
11	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
12// Since Android NDK v16 getpagesize is defined as inline inside unistd.h
13#ifdef __ANDROID__
14#	include <unistd.h>
15#endif
16		]], [[
17	getpagesize();
18]])],
19	[ ac_cv_func_getpagesize="yes" ],
20	[ ac_cv_func_getpagesize="no"
21	])
22])
23AM_CONDITIONAL([HAVE_ASPRINTF], [test "x$ac_cv_func_asprintf" = xyes])
24AM_CONDITIONAL([HAVE_FREEZERO], [test "x$ac_cv_func_freezero" = xyes])
25AM_CONDITIONAL([HAVE_GETPAGESIZE], [test "x$ac_cv_func_getpagesize" = xyes])
26AM_CONDITIONAL([HAVE_MEMMEM], [test "x$ac_cv_func_memmem" = xyes])
27AM_CONDITIONAL([HAVE_READPASSPHRASE], [test "x$ac_cv_func_readpassphrase" = xyes])
28AM_CONDITIONAL([HAVE_REALLOCARRAY], [test "x$ac_cv_func_reallocarray" = xyes])
29AM_CONDITIONAL([HAVE_RECALLOCARRAY], [test "x$ac_cv_func_recallocarray" = xyes])
30AM_CONDITIONAL([HAVE_STRLCAT], [test "x$ac_cv_func_strlcat" = xyes])
31AM_CONDITIONAL([HAVE_STRLCPY], [test "x$ac_cv_func_strlcpy" = xyes])
32AM_CONDITIONAL([HAVE_STRNDUP], [test "x$ac_cv_func_strndup" = xyes])
33AM_CONDITIONAL([HAVE_STRNLEN], [test "x$ac_cv_func_strnlen" = xyes])
34AM_CONDITIONAL([HAVE_STRSEP], [test "x$ac_cv_func_strsep" = xyes])
35AM_CONDITIONAL([HAVE_STRTONUM], [test "x$ac_cv_func_strtonum" = xyes])
36AM_CONDITIONAL([HAVE_TIMEGM], [test "x$ac_cv_func_timegm" = xyes])
37AM_CONDITIONAL([HAVE_GETPROGNAME], [test "x$ac_cv_func_getprogname" = xyes])
38AM_CONDITIONAL([HAVE_SYSLOG], [test "x$ac_cv_func_syslog" = xyes])
39AM_CONDITIONAL([HAVE_SYSLOG_R], [test "x$ac_cv_func_syslog_r" = xyes])
40])
41
42AC_DEFUN([CHECK_SYSCALL_COMPAT], [
43AC_CHECK_FUNCS([accept4 pipe2 pledge poll socketpair])
44AM_CONDITIONAL([HAVE_ACCEPT4], [test "x$ac_cv_func_accept4" = xyes])
45AM_CONDITIONAL([HAVE_PIPE2], [test "x$ac_cv_func_pipe2" = xyes])
46AM_CONDITIONAL([HAVE_PLEDGE], [test "x$ac_cv_func_pledge" = xyes])
47AM_CONDITIONAL([HAVE_POLL], [test "x$ac_cv_func_poll" = xyes])
48AM_CONDITIONAL([HAVE_SOCKETPAIR], [test "x$ac_cv_func_socketpair" = xyes])
49])
50
51AC_DEFUN([CHECK_B64_NTOP], [
52AC_SEARCH_LIBS([b64_ntop],[resolv])
53AC_SEARCH_LIBS([__b64_ntop],[resolv])
54AC_CACHE_CHECK([for b64_ntop], ac_cv_have_b64_ntop_arg, [
55	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
56#include <sys/types.h>
57#include <sys/socket.h>
58#include <netinet/in.h>
59#include <arpa/inet.h>
60#include <resolv.h>
61		]], [[ b64_ntop(NULL, 0, NULL, 0); ]])],
62	[ ac_cv_have_b64_ntop_arg="yes" ],
63	[ ac_cv_have_b64_ntop_arg="no"
64	])
65])
66AM_CONDITIONAL([HAVE_B64_NTOP], [test "x$ac_cv_func_b64_ntop_arg" = xyes])
67])
68
69AC_DEFUN([CHECK_CRYPTO_COMPAT], [
70# Check crypto-related libc functions and syscalls
71AC_CHECK_FUNCS([arc4random arc4random_buf arc4random_uniform])
72AC_CHECK_FUNCS([explicit_bzero getauxval])
73
74AC_CACHE_CHECK([for getentropy], ac_cv_func_getentropy, [
75	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
76#include <sys/types.h>
77#include <unistd.h>
78
79/*
80 * Explanation:
81 *
82 *   - iOS <= 10.1 fails because of missing sys/random.h
83 *
84 *   - in macOS 10.12 getentropy is not tagged as introduced in
85 *     10.12 so we cannot use it for target < 10.12
86 */
87#ifdef __APPLE__
88#  include <AvailabilityMacros.h>
89#  include <TargetConditionals.h>
90
91# if (TARGET_OS_IPHONE || TARGET_OS_SIMULATOR)
92#  include <sys/random.h> /* Not available as of iOS <= 10.1 */
93# else
94
95#  include <sys/random.h> /* Pre 10.12 systems should die here */
96
97/* Based on: https://gitweb.torproject.org/tor.git/commit/?id=16fcbd21 */
98#  ifndef MAC_OS_X_VERSION_10_12
99#    define MAC_OS_X_VERSION_10_12 101200 /* Robustness */
100#  endif
101#  if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
102#    if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
103#      error "Targeting on Mac OSX 10.11 or earlier"
104#    endif
105#  endif
106
107# endif
108#endif /* __APPLE__ */
109		]], [[
110	char buffer;
111	(void)getentropy(&buffer, sizeof (buffer));
112]])],
113	[ ac_cv_func_getentropy="yes" ],
114	[ ac_cv_func_getentropy="no"
115	])
116])
117
118AC_CHECK_FUNCS([timingsafe_bcmp timingsafe_memcmp])
119AM_CONDITIONAL([HAVE_ARC4RANDOM], [test "x$ac_cv_func_arc4random" = xyes])
120AM_CONDITIONAL([HAVE_ARC4RANDOM_BUF], [test "x$ac_cv_func_arc4random_buf" = xyes])
121AM_CONDITIONAL([HAVE_ARC4RANDOM_UNIFORM], [test "x$ac_cv_func_arc4random_uniform" = xyes])
122AM_CONDITIONAL([HAVE_EXPLICIT_BZERO], [test "x$ac_cv_func_explicit_bzero" = xyes])
123AM_CONDITIONAL([HAVE_GETENTROPY], [test "x$ac_cv_func_getentropy" = xyes])
124AM_CONDITIONAL([HAVE_TIMINGSAFE_BCMP], [test "x$ac_cv_func_timingsafe_bcmp" = xyes])
125AM_CONDITIONAL([HAVE_TIMINGSAFE_MEMCMP], [test "x$ac_cv_func_timingsafe_memcmp" = xyes])
126
127# Override arc4random_buf implementations with known issues
128AM_CONDITIONAL([HAVE_ARC4RANDOM_BUF],
129	[test "x$USE_BUILTIN_ARC4RANDOM" != xyes \
130	   -a "x$ac_cv_func_arc4random_buf" = xyes])
131
132# Check for getentropy fallback dependencies
133AC_CHECK_FUNCS([getauxval])
134AC_SEARCH_LIBS([dl_iterate_phdr],[dl])
135AC_CHECK_FUNCS([dl_iterate_phdr])
136
137AC_SEARCH_LIBS([pthread_once],[pthread])
138AC_SEARCH_LIBS([pthread_mutex_lock],[pthread])
139AC_SEARCH_LIBS([clock_gettime],[rt posix4])
140AC_CHECK_FUNCS([clock_gettime])
141AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "x$ac_cv_func_clock_gettime" = xyes])
142])
143
144AC_DEFUN([CHECK_VA_COPY], [
145AC_CACHE_CHECK([whether va_copy exists], ac_cv_have_va_copy, [
146	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
147#include <stdarg.h>
148va_list x,y;
149		]], [[ va_copy(x,y); ]])],
150	[ ac_cv_have_va_copy="yes" ],
151	[ ac_cv_have_va_copy="no"
152	])
153])
154if test "x$ac_cv_have_va_copy" = "xyes" ; then
155	AC_DEFINE([HAVE_VA_COPY], [1], [Define if va_copy exists])
156fi
157
158AC_CACHE_CHECK([whether __va_copy exists], ac_cv_have___va_copy, [
159	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
160#include <stdarg.h>
161va_list x,y;
162		]], [[ __va_copy(x,y); ]])],
163	[ ac_cv_have___va_copy="yes" ], [ ac_cv_have___va_copy="no"
164	])
165])
166if test "x$ac_cv_have___va_copy" = "xyes" ; then
167	AC_DEFINE([HAVE___VA_COPY], [1], [Define if __va_copy exists])
168fi
169])
170