AC_INIT(cmds.c)
AC_PREFIX_PROGRAM(ftpd)
AC_CONFIG_HEADER(config.h)
AC_PROG_CC

dnl
dnl Set of libraries to use
dnl
LIBS=""
AC_SUBST(LIBS)

AC_C_CONST
AC_FUNC_MMAP
AC_TYPE_SIGNAL
AC_CHECK_FUNCS(snprintf vsnprintf)

dnl
dnl Check if we need -lsocket -- taken from wu-ftpd
dnl
AC_CHECK_LIB(socket,socket,result=yes,result=no)
if test "$result" = "yes"; then
  LIBS="$LIBS -lsocket"
else
  AC_CHECK_LIB(socket,connect,result=yes,result=no)
  if test "$result" = "yes"; then
    LIBS="$LIBS -lsocket"
  fi
fi

dnl
dnl Check if we need -lcrypt
dnl
AC_CHECK_LIB(crypt,crypt,result=yes,result=no)
if test "$result" = "yes"; then
  LIBS="$LIBS -lcrypt"
fi

dnl
dnl The following weirdness is to support --disable as well as --enable
dnl (but long live m4!)
dnl 
define(ARG_ENABLE_BETAFTPD,[
AC_MSG_CHECKING(whether to enable $1)
AC_ARG_ENABLE($1,[$2],result=yes,result=no)
if test "$result" = "no"; then
	enableval=no
fi

if test "$enableval" = "yes"; then
	$3
fi
AC_MSG_RESULT($enableval)
])

dnl
dnl Check for options
dnl
ARG_ENABLE_BETAFTPD(xferlog,[  --enable-xferlog        Enable transfer log support],AC_DEFINE(WANT_XFERLOG))
ARG_ENABLE_BETAFTPD(ascii,[  --enable-ascii          Enable ASCII mode support],AC_DEFINE(WANT_ASCII))
ARG_ENABLE_BETAFTPD(fullscreen,[  --enable-fullscreen     Run in fullscreen mode (implies --disable-fork)],AC_DEFINE(WANT_FULLSCREEN))

if test "$enableval" = "no"; then
	ARG_ENABLE_BETAFTPD(fork,[  --enable-fork           Make the server fork into the background],AC_DEFINE(WANT_FORK))
fi

ARG_ENABLE_BETAFTPD(upload,[  --enable-upload         Enable upload support],AC_DEFINE(WANT_UPLOAD))
ARG_ENABLE_BETAFTPD(stat,[  --enable-stat           Enable STAT command (see README first)],AC_DEFINE(WANT_STAT))
ARG_ENABLE_BETAFTPD(dcache,[  --enable-dcache         Enable directory listing cache],AC_DEFINE(WANT_DCACHE))
ARG_ENABLE_BETAFTPD(message,[  --enable-message        Enable .message files etc.],AC_DEFINE(WANT_MESSAGE))

dnl
dnl The following line _must_ be last...
dnl
ARG_ENABLE_BETAFTPD(shadow,[  --enable-shadow         Enable shadow password support],AC_DEFINE(WANT_SHADOW))

nonroot_support=yes

if test "$enableval" = "yes"; then
	AC_CHECK_HEADERS(shadow.h)
	nonroot_support=no
else
	dnl Causes unknown trouble on SunOS, so it's disabled
	dnl if test -e "/etc/shadow"; then
	dnl	AC_MSG_WARN()
	dnl	AC_MSG_WARN([It looks like you're using shadow passwords, consider])
	dnl	AC_MSG_WARN([giving the --enable-shadow flag to configure. Proceeding])
	dnl	AC_MSG_WARN([_without_ support for shadow passwords -- you might not])
	dnl	AC_MSG_WARN([be able to log in!])
	dnl	AC_MSG_WARN()
	dnl fi
	echo
fi

if test "$nonroot_support" = "yes"; then
	ARG_ENABLE_BETAFTPD(nonroot,[  --enable-nonroot        Do not need root access (EXPERIMENTAL)],AC_DEFINE(WANT_NONROOT))
else
	enableval=no
fi

if test "$enableval" = "yes"; then
	AC_MSG_WARN()
        AC_MSG_WARN([Please read the README.nonroot file before using --enable-nonroot])
	AC_MSG_WARN()
else

dnl
dnl Try to find our effective userid (use our own C program?)
dnl
	AC_MSG_CHECKING(how to get effective uid)
	if test -n "$EUID"; then
		B_UID=$EUID
		AC_MSG_RESULT([\$EUID ($EUID)])
	elif test -n "$euid"; then
		B_UID=$euid
		AC_MSG_RESULT([\$euid ($euid)])
	elif test -n "$UID"; then
		B_UID=$UID
		AC_MSG_RESULT([\$UID ($UID)])
	elif test -n "$uid"; then
		B_UID=$uid
		AC_MSG_RESULT([\$uid ($uid)])
	elif test "`whoami 2>/dev/null`" = "root"; then
		B_UID=0
		AC_MSG_RESULT([whoami (root)])
	else
		# assume we're not root
		B_UID=1
		AC_MSG_RESULT(not found, assuming not root)
	fi

	if test "$B_UID" -ne 0; then
		AC_MSG_WARN()
		AC_MSG_WARN([You do not seem to have root privilegies. If you])
		AC_MSG_WARN([want to run BetaFTPD without being root, please])
		AC_MSG_WARN([consider giving the --enable-nonroot flag to])
		AC_MSG_WARN([configure, and read the README.nonroot file.])
		AC_MSG_WARN()
	fi
fi

AC_CHECK_TYPE(uid_t,int)
AC_CHECK_TYPE(gid_t,int)

AC_CHECK_HEADERS(crypt.h unistd.h time.h sys/time.h errno.h netinet/in.h)
AC_CHECK_HEADERS(netinet/ip.h stropts.h sys/conf.h arpa/inet.h sys/filio.h)
AC_CHECK_HEADERS(netinet/tcp.h sys/types.h netdb.h glob.h stdio.h)
AC_CHECK_HEADERS(stdlib.h stdarg.h stdlib.h string.h strings.h fcntl.h)
AC_CHECK_HEADERS(sys/ioctl.h sys/socket.h sys/stat.h sys/param.h signal.h)
AC_CHECK_HEADERS(sys/signal.h dirent.h pwd.h grp.h netinet/in_systm.h)
AC_CHECK_HEADERS(assert.h)

AC_CHECK_HEADER(netinet/tcp.h,result=yes,result=no)

dnl
dnl linux/socket.h can create some problems on Debian GNU/Linux systems
dnl

if test "$result" = "yes"; then
     AC_MSG_CHECKING(if netinet/tcp.h is enough)
     AC_EGREP_CPP(yes,
     [#include <netinet/tcp.h>
#ifndef TCP_NODELAY
      yes
#endif
     ], result=no, result=yes)
     AC_MSG_RESULT($result)
fi

if test "$result" = "no"; then
	AC_CHECK_HEADER(linux/socket.h)
fi

AC_CHECK_HEADERS(sys/poll.h)

AC_MSG_CHECKING([for poll()])
AC_TRY_COMPILE([
#if HAVE_SYS_POLL_H
#include <sys/poll.h>
#endif
],[
	struct pollfd fds[1];
	fds[0].fd = 0;
	fds[0].events = POLLIN | POLLOUT | POLLERR | POLLHUP | POLLNVAL;

	poll(fds, 1, 1000);
],enableval=yes,enableval=no)
AC_MSG_RESULT($enableval)

if test "$enableval" = "yes"; then
	AC_DEFINE(HAVE_POLL, 1, [Define if you have poll().])
fi

dnl
dnl sendfile() is not standard -- we'll have to check the different
dnl versions one by one :-)
dnl
AC_CHECK_HEADERS(sys/sendfile.h,result=yes,result=no)

if test "$result" = "yes"; then
	AC_MSG_CHECKING([for Linux sendfile()])
	AC_TRY_COMPILE([
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#if HAVE_SYS_LIMITS_H
#include <sys/limits.h>
#endif

#if HAVE_UNISTD_H
#include <unistd.h>
#endif

#if HAVE_SYS_SENDFILE_H
#include <sys/sendfile.h>
#endif

#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#if HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif],[
	int out_fd = 1, in_fd = 0;
	off_t offset = 0;
	size_t size = 1024;

	sendfile(out_fd, in_fd, &offset, size);
],enableval=yes,enableval=no)
	AC_MSG_RESULT($enableval)

	if test "$enableval" = "yes"; then
		AC_DEFINE(HAVE_LINUX_SENDFILE, 1, [Define if you have sendfile() with the Linux semantics.])
	fi
fi

AC_CHECK_HEADER(sys/uio.h,result=yes,result=no)
if test "$result" = "yes"; then
	AC_MSG_CHECKING([for BSD sendfile()])
	AC_TRY_COMPILE([
#if HAVE_SYS_LIMITS_H
#include <sys/limits.h>
#endif

#if HAVE_UNISTD_H
#include <unistd.h>
#endif

#if HAVE_SYS_SENDFILE_H
#include <sys/sendfile.h>
#endif

#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#if HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
],[
        int in_fd = 0, out_sock = 3;
        off_t offset;
        size_t size = 1024;
	struct sf_hdtr hdtr;

	hdtr.hdr_cnt = 0;
	hdtr.trl_cnt = 0;

        sendfile(in_fd, out_sock, offset, size, &hdtr, &offset, 0);
],enableval=yes,enableval=no)
	AC_MSG_RESULT($enableval)

	if test "$enableval" = "yes"; then
	       	AC_DEFINE(HAVE_BSD_SENDFILE, 1, [Define if you have sendfile() with the BSD semantics.])
	fi
fi

AC_OUTPUT(Makefile)