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# Macro to check if websockets support was enabled. This macro also
# takes care of detecting older versions of libwebsockets (lacking
# pkg-config support, no per-context userdata) and propagating this
# information to config.h and the compilation process.
#
AC_DEFUN([CHECK_WEBSOCKETS],
[
AC_LANG_PUSH([C])
AC_ARG_ENABLE(websockets,
[ --enable-websockets enable websockets support],
[enable_websockets=$enableval], [enable_websockets=auto])
# Check if we have properly packaged libwebsockets (json-c is now mandatory
# and already has been tested for).
if test "$enable_websockets" != "no"; then
PKG_CHECK_MODULES(WEBSOCKETS, [libwebsockets],
[have_websockets=yes], [have_websockets=no])
if test "$have_websockets" = "yes"; then
WEBSOCKETS_CFLAGS="`pkg-config --cflags libwebsockets`"
# Check for a couple of recent features we need to adopt to.
saved_CFLAGS="$CFLAGS"
saved_LDFLAGS="$LDFLAGS"
saved_LIBS="$LIBS"
# Note that (at least with autoconf 2.69 and gcc 4.7.2), setting
# LD_AS_NEEDED to 1 breaks AC_LINK_IFELSE. That macro generates
# the compilation command so that the libraries are specified
# before the generated C source so all referenced/tested symbols
# from any of the libraries end up being undefined. This fools
# AC_LINK_IFELSE to consider the test a failure and select the
# else branch.
# rpmbuild always sets LD_AS_NEEDED to 1. To work around this save
# and restore LD_AS_NEEDED for the duration of the AC_LINK_IFELSE
# tests.
saved_LD_AS_NEEDED="$LD_AS_NEEDED"
unset LD_AS_NEEDED
CFLAGS="`pkg-config --cflags libwebsockets`"
LIBS="`pkg-config --libs libwebsockets`"
# Check for new context creation API.
AC_MSG_CHECKING([for WEBSOCKETS new context creation API])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>]],
[[struct libwebsocket_context *ctx;
ctx = libwebsocket_create_context(NULL);]])],
[websockets_cci=yes],
[websockets_cci=no])
AC_MSG_RESULT([$websockets_cci])
# Check for new libwebsockets_get_internal_extensions.
AC_MSG_CHECKING([for WEBSOCKETS internal extension query API])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>]],
[[struct libwebsocket_extension *ext;
ext = libwebsocket_get_internal_extensions();]])],
[websockets_query_ext=yes],
[websockets_query_ext=no])
AC_MSG_RESULT([$websockets_query_ext])
# Check for newer lws_set_log_level API.
# Note that we cheat heavily here: instead of rolling a proper
# test, we blindly assume gcc, turn on the -Werror flag (to catch
# calls with a mismatching function pointer) and hope that we will
# not get false negatives because of other warnings.
no_werror_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror"
AC_MSG_CHECKING([for WEBSOCKETS updated logging API.])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>
static void logger(int level, const char *line) {
return;
}]],
[[lws_set_log_level(LLL_INFO, logger);]])],
[websockets_log_with_level=yes],
[websockets_log_with_level=no])
AC_MSG_RESULT([$websockets_log_with_level])
# Check whether we have libwebsocket_close_and_free_session.
AC_MSG_CHECKING([for WEBSOCKETS close_and_free_session API])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>]],
[[libwebsocket_close_and_free_session(NULL, NULL, 0);]])],
[websockets_close_session=yes],
[websockets_close_session=no])
AC_MSG_RESULT([$websockets_close_session])
# Check for LWS_CALLBACK_FILTER_HTTP_CONNECTION.
AC_MSG_CHECKING([for WEBSOCKETS LWS_CALLBACK_FILTER_HTTP_CONNECTION])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>]],
[[int foo = LWS_CALLBACK_FILTER_HTTP_CONNECTION;]])],
[websockets_filter_http_connection=yes],
[websockets_filter_http_connection=no])
AC_MSG_RESULT([$websockets_filter_http_connection])
# Check for LWS_CALLBACK_CHANGE_MODE_POLL_FD.
AC_MSG_CHECKING([for WEBSOCKETS LWS_CALLBACK_CHANGE_MODE_POLL_FD])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>]],
[[int foo = LWS_CALLBACK_CHANGE_MODE_POLL_FD;]])],
[websockets_change_poll=yes],
[websockets_change_poll=no])
AC_MSG_RESULT([$websockets_change_poll])
# Check the signature of libwebsockets_serve_http_file to see if
# it takes an extra (other_headers) argument.
AC_MSG_CHECKING([for WEBSOCKETS libwebsockets_serve_http_file other_headers argument])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>]],
[[return libwebsockets_serve_http_file(NULL, NULL, "", "", "");]])],
[websockets_serve_file_extraarg=yes],
[websockets_serve_file_extraarg=no])
AC_MSG_RESULT([$websockets_serve_file_extraarg])
CFLAGS="$saved_CFLAGS"
LDFLAGS="$saved_LDFLAGS"
LIBS="$saved_LIBS"
if test -n "$saved_LD_AS_NEEDED"; then
export LD_AS_NEEDED="$saved_LD_AS_NEEDED"
fi
else
WEBSOCKETS_CFLAGS=""
fi
# Check for older websockets.
if test "$have_websockets" = "no"; then
saved_LDFLAGS="$LDFLAGS"
saved_LIBS="$LIBS"
LIBS="-lwebsockets"
AC_MSG_CHECKING([for WEBSOCKETS without pkg-config support])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>]],
[[struct libwebsocket_context *ctx;
ctx = libwebsocket_create_context(0, NULL, NULL, NULL,
NULL, NULL, NULL,
-1, -1, 0, NULL);]])],
[have_websockets=yes;old_websockets=no],
[have_websockets=no])
AC_MSG_RESULT([$have_websockets])
fi
# Check if we have a really old libwebsockets, still without
# per-context user data.
if test "$old_websockets" != "no"; then
AC_MSG_CHECKING([for really old WEBSOCKETS])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <libwebsockets.h>]],
[[struct libwebsocket_context *ctx;
ctx = libwebsocket_create_context(0, NULL, NULL, NULL,
NULL, NULL,
-1, -1, 0);]])],
[have_websockets=yes;old_websockets=yes],
[old_websockets=no])
AC_MSG_RESULT([$old_websockets])
fi
WEBSOCKETS_LIBS="-lwebsockets"
if test "$old_websockets" = "yes"; then
WEBSOCKETS_CFLAGS="$WEBSOCKETS_CFLAGS -DWEBSOCKETS_OLD"
fi
if test "$websockets_cci" = "yes"; then
WEBSOCKETS_CFLAGS="$WEBSOCKETS_CFLAGS -DWEBSOCKETS_CONTEXT_INFO"
fi
if test "$websockets_query_ext" = "yes"; then
WEBSOCKETS_CFLAGS="$WEBSOCKETS_CFLAGS -DWEBSOCKETS_QUERY_EXTENSIONS"
fi
if test "$websockets_log_with_level" = "yes"; then
WEBSOCKETS_CFLAGS="$WEBSOCKETS_CFLAGS -DWEBSOCKETS_LOG_WITH_LEVEL"
fi
if test "$websockets_close_session" = "yes"; then
WEBSOCKETS_CFLAGS="$WEBSOCKETS_CFLAGS -DWEBSOCKETS_CLOSE_SESSION"
fi
if test "$websockets_filter_http_connection" = "yes"; then
WEBSOCKETS_CFLAGS="$WEBSOCKETS_CFLAGS -DWEBSOCKETS_FILTER_HTTP_CONNECTION"
fi
if test "$websockets_change_poll" = "yes"; then
WEBSOCKETS_CFLAGS="$WEBSOCKETS_CFLAGS -DWEBSOCKETS_CHANGE_MODE_POLL_FD"
fi
if test "$websockets_serve_file_extraarg" = "yes"; then
WEBSOCKETS_CFLAGS="$WEBSOCKETS_CFLAGS -DWEBSOCKETS_SERVE_FILE_EXTRAARG"
fi
LDFLAGS="$saved_LDFLAGS"
LIBS="$saved_LIBS"
else
AC_MSG_NOTICE([libwebsockets support is disabled.])
fi
# Bail out if we lack mandatory support.
if test "$enable_websockets" = "yes" -a "$have_websockets" = "no"; then
AC_MSG_ERROR([libwebsockets development libraries not found.])
fi
# Enable if found and autosupport requested.
if test "$enable_websockets" = "auto"; then
enable_websockets=$have_websockets
fi
# If enabled, set up our autoconf variables accordingly.
if test "$enable_websockets" = "yes"; then
AC_DEFINE([WEBSOCKETS_ENABLED], 1, [Enable websockets support ?])
if test "$old_websockets" = "yes"; then
AC_DEFINE([WEBSOCKETS_OLD], 1, [No per-context userdata ?])
fi
fi
# Finally substitute everything.
AM_CONDITIONAL(WEBSOCKETS_ENABLED, [test "$enable_websockets" = "yes"])
AM_CONDITIONAL(WEBSOCKETS_OLD, [test "$old_websockets" = "yes"])
AC_SUBST(WEBSOCKETS_ENABLED)
AC_SUBST(WEBSOCKETS_CFLAGS)
AC_SUBST(WEBSOCKETS_LIBS)
AC_SUBST(WEBSOCKETS_OLD)
AC_LANG_POP
])
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