3 dnl This is the one location where the authoritative version number is stored
4 AC_INIT(shellinabox, 2.10, markus@shellinabox.com)
7 AC_DEFINE_UNQUOTED(VCS_REVISION, "${VCS_REVISION}",
8 [Most recent revision number in the version control system])
10 dnl Set up autoconf/automake for building C libraries and binaries with GCC
11 CFLAGS="${CFLAGS:--Os}"
13 AM_CONFIG_HEADER(config.h)
18 AC_SUBST(LIBTOOL_DEPS)
20 AC_PROG_GCC_TRADITIONAL
22 dnl Check for header files that do not exist on all platforms
23 AC_CHECK_HEADERS([libutil.h pthread.h pty.h strings.h sys/prctl.h sys/uio.h \
24 util.h utmp.h utmpx.h])
26 dnl Most systems require linking against libutil.so in order to get login_tty()
27 AC_CHECK_FUNCS(login_tty, [],
28 [AC_CHECK_LIB(util, login_tty,
30 AC_DEFINE(HAVE_LOGIN_TTY)])])
32 dnl Use strlcat() instead of strncat() to avoid spurious warnings
33 AC_CHECK_FUNCS([strlcat])
35 dnl Prefer thread-safe functions, if available
36 AC_CHECK_FUNCS([getgrgid_r getgrnam_r gethostbyname_r getpwnam_r getpwuid_r \
39 dnl We prefer ptsname_r(), but will settle for ptsname() if necessary
40 AC_TRY_LINK([#ifndef _XOPEN_SOURCE
47 [char buf[10]; ptsname_r(0, buf, sizeof(buf));],
48 [AC_DEFINE(HAVE_PTSNAME_R, 1,
49 Define to 1 if you have a re-entrant version of ptsname)])
51 dnl Apparently, some systems define sigwait() but fail to implement it
52 AC_TRY_LINK([#include <pthread.h>
54 [sigset_t s; int n; sigwait(&s, &n);],
55 [AC_DEFINE(HAVE_SIGWAIT, 1,
56 Define to 1 if you have a working sigwait)])
58 dnl Not every system has support for isnan()
59 AC_TRY_LINK([#include <math.h>],
60 [if (isnan(0.0)) return 1;],
61 [AC_DEFINE(HAVE_ISNAN, 1,
62 Define to 1 if you have support for isnan)])
64 dnl Even if utmpx.h exists, not all systems have support for updwtmpx()
65 AC_TRY_LINK([#include <utmp.h>],
67 [AC_DEFINE(HAVE_UPDWTMP, 1,
68 Define to 1 if you have support for updwtmp)])
69 AC_TRY_LINK([#include <utmpx.h>],
71 [AC_DEFINE(HAVE_UPDWTMPX, 1,
72 Define to 1 if you have support for updwtmpx)])
74 dnl Check if the compiler supports aliasing of symbols
75 AC_TRY_LINK([void x(void) { };
76 void y(void) __attribute__((alias("x")));],
78 [AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
79 Define to 1 if you have support for symbol aliasing)])
81 dnl On some systems, calling /bin/login does not work. Disable the LOGIN
82 dnl feature, if the user tells us that it does not do the right thing.
84 [ --disable-login on some systems (e.g. Fedora), calling /bin/login
85 does not work well. If you know that your system
86 suffers from this problem, set this option to
87 remove support for the LOGIN keyword in the
88 service description.])
89 if test "x$enable_login" != xno; then
90 AC_DEFINE(HAVE_BIN_LOGIN, 1,
91 Set if you want support for calling /bin/login)
94 dnl We automatically detect SSL support, but allow users to disable it
96 [ --disable-ssl if available at built-time, support for SSL
97 connections will be enabled. It can still be
98 disabled at run-time, either on the daemon's
99 command line or if the operating system does not
100 have the OpenSSL libraries available.])
102 dnl We automatically detect PAM support, but allow users to disable it
104 [ --disable-pam PAM support is necessary in order to authenticate
105 users for running programs other than their default
108 dnl We try to always use dlopen() instead of linking libraries dynamically, as
109 dnl this reduces the hard run-time dependencies that our binary has. But we
110 dnl allow users to disable this feature.
111 AC_ARG_ENABLE(runtime-loading,
112 [ --disable-runtime-loading ShellInABox will try to load the OpenSSL, and PAM
113 libraries at run-time, if it has been compiled with
114 support for these libraries, and if the operating
115 system supports dynamic loading of libraries. This
116 allows you to install the same binary on different
117 systems independent of whether they have OpenSSL
118 and PAM enabled. If you would rather directly link
119 these libraries into the binary, thus making them a
120 hard dependency, then disable runtime-loading.])
122 dnl Only test for OpenSSL headers, if not explicitly disabled
123 if test "x$enable_ssl" != xno; then
124 AC_CHECK_HEADERS([openssl/bio.h openssl/err.h openssl/ssl.h])
127 dnl Only test for PAM headers, if not explicitly disabled
128 if test "x$enable_pam" != xno; then
129 AC_CHECK_HEADERS([security/pam_appl.h security/pam_client.h \
130 security/pam_misc.h ])
133 dnl Only test for dlopen(), if not explicitly disabled. Add required libdl.so
134 dnl library if necessary. Also, if dlopen() is not available on this system,
135 dnl explicitly disable runtime loading.
136 if test "x$enable_runtime_loading" != xno; then
137 AC_CHECK_FUNCS(dlopen, [],
138 [AC_CHECK_LIB(dl, dlopen,
140 AC_DEFINE(HAVE_DLOPEN)],
141 [enable_runtime_loading=no])])
144 dnl If runtime loading has been disabled, add OpenSSL and PAM as hard
146 if test "x$enable_runtime_loading" == xno; then
147 dnl Link against OpenSSL libraries, unless SSL support has been disabled
148 if test "x$enable_ssl" != xno; then
149 AC_CHECK_HEADER(openssl/bio.h,
150 [AC_CHECK_HEADER(openssl/err.h,
151 [AC_CHECK_HEADER(openssl/ssl.h, [LIBS="-lssl -lcrypto $LIBS"])])])
154 dnl Link against PAM libraries, unless PAM support has been disabled
155 if test "x$enable_pam" != xno; then
156 AC_CHECK_HEADER(security/pam_appl.h, [LIBS="-lpam $LIBS"])
157 AC_CHECK_HEADER(security/pam_misc.h, [LIBS="-lpam_misc $LIBS"])
161 AC_CHECK_LIB(z, deflate, [
162 AC_CHECK_HEADER(zlib.h, [LIBS="-lz $LIBS"
163 AC_DEFINE(HAVE_ZLIB, 1,
164 Define to 1 if zlib development files are installed)
167 dnl Generate output files
168 AC_CONFIG_FILES([Makefile])