Add OTR support.

This patch adds support for the OTR protocol to irssi. This is an import
of the external irssi-otr project that we are now taking over
maintership for.

Major thanks to the original authors of Irssi-OTR: Uli Meis and David
Goulet. Thanks to the OTR community in #OTR on OFTC, thanks to everyone
who have helped testing the patches and submitted UI suggestions.

1 files changed, 134 insertions, 0 deletions

diff --git a/m4/libotr.m4 b/m4/libotr.m4
new file mode 100644
index 00000000..80b25f86
--- /dev/null
+++ b/m4/libotr.m4
@@ -0,0 +1,134 @@
+dnl
+dnl  Off-the-Record Messaging library
+dnl  Copyright (C) 2004-2007  Ian Goldberg, Chris Alexander, Nikita Borisov
+dnl                           <otr@cypherpunks.ca>
+dnl
+dnl  This library is free software; you can redistribute it and/or
+dnl  modify it under the terms of version 2.1 of the GNU Lesser General
+dnl  Public License as published by the Free Software Foundation.
+dnl
+dnl  This library is distributed in the hope that it will be useful,
+dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+dnl  Lesser General Public License for more details.
+dnl
+dnl  You should have received a copy of the GNU Lesser General Public
+dnl  License along with this library; if not, write to the Free Software
+dnl  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+dnl
+
+dnl AM_PATH_LIBOTR([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
+dnl Test for libotr, and define LIBOTR_CFLAGS and LIBOTR_LIBS as appropriate.
+dnl enables arguments --with-libotr-prefix=
+dnl                   --with-libotr-inc-prefix=
+dnl
+dnl You must already have found libgcrypt with AM_PATH_LIBGCRYPT
+dnl
+dnl Adapted from alsa.m4, originally by
+dnl      Richard Boulton <richard-alsa@tartarus.org>
+dnl      Christopher Lansdown <lansdoct@cs.alfred.edu>
+dnl      Jaroslav Kysela <perex@suse.cz>
+
+AC_DEFUN([AM_PATH_LIBOTR],
+[dnl Save the original CFLAGS, LDFLAGS, and LIBS
+libotr_save_CFLAGS="$CFLAGS"
+libotr_save_LDFLAGS="$LDFLAGS"
+libotr_save_LIBS="$LIBS"
+libotr_found=yes
+
+dnl
+dnl Get the cflags and libraries for libotr
+dnl
+AC_ARG_WITH(libotr-prefix,
+[  --with-libotr-prefix=PFX  Prefix where libotr is installed(optional)],
+[libotr_prefix="$withval"], [libotr_prefix=""])
+
+AC_ARG_WITH(libotr-inc-prefix,
+[  --with-libotr-inc-prefix=PFX  Prefix where libotr includes are (optional)],
+[libotr_inc_prefix="$withval"], [libotr_inc_prefix=""])
+
+dnl Add any special include directories
+AC_MSG_CHECKING(for libotr CFLAGS)
+if test "$libotr_inc_prefix" != "" ; then
+	LIBOTR_CFLAGS="$LIBOTR_CFLAGS -I$libotr_inc_prefix"
+	CFLAGS="$CFLAGS $LIBOTR_CFLAGS"
+fi
+AC_MSG_RESULT($LIBOTR_CFLAGS)
+
+dnl add any special lib dirs
+AC_MSG_CHECKING(for libotr LIBS)
+if test "$libotr_prefix" != "" ; then
+	LIBOTR_LIBS="$LIBOTR_LIBS -L$libotr_prefix"
+	LDFLAGS="$LDFLAGS $LIBOTR_LIBS"
+fi
+
+dnl add the libotr library
+LIBOTR_LIBS="$LIBOTR_LIBS -lotr"
+LIBS="$LIBOTR_LIBS $LIBS"
+AC_MSG_RESULT($LIBOTR_LIBS)
+
+dnl Check for a working version of libotr that is of the right version.
+min_libotr_version=ifelse([$1], ,3.0.0,$1)
+no_libotr=""
+    libotr_min_major_version=`echo $min_libotr_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
+    libotr_min_minor_version=`echo $min_libotr_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
+    libotr_min_sub_version=`echo $min_libotr_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
+AC_MSG_CHECKING(for libotr headers version $libotr_min_major_version.x >= $min_libotr_version)
+
+AC_LANG_SAVE
+AC_LANG_C
+AC_TRY_COMPILE([
+#include <stdlib.h>
+#include <libotr/version.h>
+], [
+#  if(OTRL_VERSION_MAJOR != $libotr_min_major_version)
+#    error not present
+#  else
+
+#    if(OTRL_VERSION_MINOR > $libotr_min_minor_version)
+       exit(0);
+#    else
+#      if(OTRL_VERSION_MINOR < $libotr_min_minor_version)
+#        error not present
+#      endif
+
+#      if(OTRL_VERSION_SUB < $libotr_min_sub_version)
+#        error not present
+#      endif
+#    endif
+#  endif
+exit(0);
+],
+  [AC_MSG_RESULT(found.)],
+  [AC_MSG_RESULT(not present.)
+   ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libotr not found.)])
+   libotr_found=no]
+)
+AC_LANG_RESTORE
+
+dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.
+AC_CHECK_LIB([otr], [otrl_message_receiving],,
+	[ifelse([$3], , [AC_MSG_ERROR(No linkable libotr was found.)])
+	 libotr_found=no],
+	 $LIBGCRYPT_LIBS
+)
+
+LDFLAGS="$libotr_save_LDFLAGS"
+LIBS="$libotr_save_LIBS"
+
+if test "x$libotr_found" = "xyes" ; then
+   ifelse([$2], , :, [$2])
+else
+   LIBOTR_CFLAGS=""
+   LIBOTR_LIBS=""
+   ifelse([$3], , :, [$3])
+fi
+
+dnl That should be it.  Now just export our symbols:
+AC_SUBST(LIBOTR_CFLAGS)
+AC_SUBST(LIBOTR_LIBS)
+])
+