3 dnl This is the one location where the authoritative version number is stored
4 AC_INIT(shellinabox, 2.8, 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 sys/prctl.h sys/uio.h util.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 getpwnam_r getpwuid_r openpty \
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 We automatically detect SSL support, but allow users to disable it
60 [ --disable-ssl if available at built-time, support for SSL
61 connections will be enabled. It can still be
62 disabled at run-time, either on the daemon's
63 command line or if the operating system does not
64 have the OpenSSL libraries available.])
66 dnl We automatically detect PAM support, but allow users to disable it
68 [ --disable-pam PAM support is necessary in order to authenticate
69 users for running programs other than their default
72 dnl We try to always use dlopen() instead of linking libraries dynamically, as
73 dnl this reduces the hard run-time dependencies that our binary has. But we
74 dnl allow users to disable this feature.
75 AC_ARG_ENABLE(runtime-loading,
76 [ --disable-runtime-loading ShellInABox will try to load the OpenSSL, and PAM
77 libraries at run-time, if it has been compiled with
78 support for these libraries, and if the operating
79 system supports dynamic loading of libraries. This
80 allows you to install the same binary on different
81 systems independent of whether they have OpenSSL
82 and PAM enabled. If you would rather directly link
83 these libraries into the binary, thus making them a
84 hard dependency, then disable runtime-loading.])
86 dnl Only test for OpenSSL headers, if not explicitly disabled
87 if test "x$enable_ssl" != xno; then
88 AC_CHECK_HEADERS([openssl/bio.h openssl/err.h openssl/ssl.h])
91 dnl Only test for PAM headers, if not explicitly disabled
92 if test "x$enable_pam" != xno; then
93 AC_CHECK_HEADERS([security/pam_appl.h security/pam_client.h \
94 security/pam_misc.h ])
97 dnl Only test for dlopen(), if not explicitly disabled. Add required libdl.so
98 dnl library if necessary. Also, if dlopen() is not available on this system,
99 dnl explicitly disable runtime loading.
100 if test "x$enable_runtime_loading" != xno; then
101 AC_CHECK_FUNCS(dlopen, [],
102 [AC_CHECK_LIB(dl, dlopen,
104 AC_DEFINE(HAVE_DLOPEN)],
105 [enable_runtime_loading=no])])
108 dnl If runtime loading has been disabled, add OpenSSL and PAM as hard
110 if test "x$enable_runtime_loading" == xno; then
111 dnl Link against OpenSSL libraries, unless SSL support has been disabled
112 if test "x$enable_ssl" != xno; then
113 AC_CHECK_HEADER(openssl/bio.h,
114 [AC_CHECK_HEADER(openssl/err.h,
115 [AC_CHECK_HEADER(openssl/ssl.h, [LIBS="-lssl -lcrypto $LIBS"])])])
118 dnl Link against PAM libraries, unless PAM support has been disabled
119 if test "x$enable_pam" != xno; then
120 AC_CHECK_HEADER(security/pam_appl.h, [LIBS="-lpam $LIBS"])
121 AC_CHECK_HEADER(security/pam_misc.h, [LIBS="-lpam_misc $LIBS"])
125 dnl Generate output files
126 AC_CONFIG_FILES([Makefile])