Merge pull request #854 from irssi/ahf/otr

OTR support, take 2

1 files changed, 267 insertions, 0 deletions

diff --git a/src/otr/otr-module.c b/src/otr/otr-module.c
new file mode 100644
index 00000000..f561b91c
--- /dev/null
+++ b/src/otr/otr-module.c
@@ -0,0 +1,267 @@
+/*
+ * Off-the-Record Messaging (OTR) module for the irssi IRC client
+ *
+ * Copyright (C) 2008  Uli Meis <a.sporto+bee@gmail.com>
+ *               2012  David Goulet <dgoulet@ev0ke.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301,USA
+ */
+
+#define _GNU_SOURCE
+#include <glib.h>
+
+#include "module.h"
+
+#include "common.h"
+#include "signals.h"
+#include "queries.h"
+#include "commands.h"
+
+#include "irc.h"
+#include "irc-servers.h"
+#include "irc-queries.h"
+#include "irc-commands.h"
+
+#include "key.h"
+#include "otr.h"
+#include "otr-formats.h"
+#include "otr-fe.h"
+#include "misc.h"
+
+/*
+ * Global state for the user. Init when the module loads.
+ */
+struct otr_user_state *user_state_global;
+
+/*
+ * Pipes all outgoing private messages through OTR
+ */
+static void sig_server_sendmsg(SERVER_REC *server, const char *target,
+		const char *msg, void *target_type_p)
+{
+	char *otrmsg = NULL;
+
+	if (GPOINTER_TO_INT(target_type_p) != SEND_TARGET_NICK) {
+		otrl_message_free(otrmsg);
+		return;
+	}
+
+	/* Critical section. On error, message MUST NOT be sent */
+	if (otr_send(server, msg, target, &otrmsg)) {
+		signal_stop();
+		otrl_message_free(otrmsg);
+		return;
+	}
+
+	if (otrmsg == NULL) {
+		/* Send original message */
+		signal_continue(4, server, target, msg, target_type_p);
+	} else {
+		/* Send encrypted message */
+		signal_continue(4, server, target, otrmsg, target_type_p);
+	}
+
+	otrl_message_free(otrmsg);
+}
+
+/*
+ * Pipes all incoming private messages through OTR
+ */
+void sig_message_private(SERVER_REC *server, const char *msg, const char *nick, const char *address, const char *target)
+{
+	char *new_msg = NULL;
+
+	if (otr_receive(server, msg, nick, &new_msg)) {
+		signal_stop();
+		otrl_message_free(new_msg);
+		return;
+	}
+
+	if (new_msg == NULL) {
+		/* This message was not OTR */
+		signal_continue(5, server, msg, nick, address, target);
+	} else {
+		/*
+		 * Check for /me IRC marker and if so, handle it so the user does not
+		 * receive a message beginning with /me but rather let irssi handle it
+		 * as a IRC action.
+		 */
+		if (strncmp(new_msg, OTR_IRC_MARKER_ME, OTR_IRC_MARKER_ME_LEN) == 0) {
+			signal_stop();
+			signal_emit("message irc action", 5, server, new_msg + OTR_IRC_MARKER_ME_LEN, nick, address, nick);
+		} else {
+			/* OTR received message */
+			signal_continue(5, server, new_msg, nick, address, target);
+		}
+	}
+
+	otrl_message_free(new_msg);
+}
+
+/*
+ * Finish an OTR conversation when its query is closed.
+ */
+static void sig_query_destroyed(QUERY_REC *query)
+{
+	if (query && query->server && query->server->connrec) {
+		otr_finish(query->server, query->name);
+	}
+}
+
+/*
+ * Handle /me IRC command.
+ */
+static void cmd_me(const char *data, IRC_SERVER_REC *server,
+		WI_ITEM_REC *item)
+{
+	const char *target;
+	char *msg, *otrmsg = NULL;
+	QUERY_REC *query;
+
+	query = QUERY(item);
+
+	if (query == NULL || query->server == NULL) {
+		return;
+	}
+
+	CMD_IRC_SERVER(server);
+	if (!IS_IRC_QUERY(query)) {
+		return;
+	}
+
+	if (server == NULL || !server->connected) {
+		cmd_return_error(CMDERR_NOT_CONNECTED);
+	}
+
+	target = window_item_get_target(item);
+
+	msg = g_strdup_printf(OTR_IRC_MARKER_ME "%s", data);
+	g_return_if_fail(msg != NULL);
+
+	/* Critical section. On error, message MUST NOT be sent */
+	otr_send(query->server, msg, target, &otrmsg);
+	g_free(msg);
+
+	if (otrmsg == NULL) {
+		return;
+	}
+
+	signal_stop();
+
+	if (otrmsg) {
+		/* Send encrypted message */
+		otr_send_message(SERVER(server), target, otrmsg);
+		otrl_message_free(otrmsg);
+	}
+
+	signal_emit("message irc own_action", 3, server, data, item->visible_name);
+}
+
+/*
+ * Optionally finish conversations on /quit. We're already doing this on unload
+ * but the quit handler terminates irc connections before unloading.
+ */
+static void cmd_quit(const char *data, void *server, WI_ITEM_REC *item)
+{
+	otr_finishall(user_state_global);
+}
+
+/*
+ * Create otr module directory if none exists.
+ */
+static void create_module_dir(void)
+{
+	char *dir_path = NULL;
+	struct stat statbuf;
+
+	/* Create ~/.irssi/otr directory. */
+	dir_path = g_strdup_printf("%s/%s", get_irssi_dir(), OTR_DIR);
+	g_return_if_fail(dir_path != NULL);
+
+	if (stat(dir_path, &statbuf) != 0) {
+		if (g_mkdir_with_parents(dir_path, 0700) != 0)
+			g_warning("Unable to create OTR directory path.");
+	} else if (!S_ISDIR(statbuf.st_mode)) {
+		g_warning("%s is not a directory.", dir_path);
+		g_warning("You should remove it with command: rm %s", dir_path);
+	}
+
+	g_free(dir_path);
+}
+
+void otr_send_message(SERVER_REC *server, const char *recipient, const char *msg)
+{
+	/*
+	 * Apparently, there are cases where the server record is NULL which has
+	 * been reported with the irssi xmpp plugin. In that case, just return an
+	 * do nothing.
+	 */
+	g_return_if_fail(server != NULL);
+
+	server->send_message(server, recipient, msg, GPOINTER_TO_INT(SEND_TARGET_NICK));
+}
+
+/*
+ * irssi init()
+ */
+void otr_core_init(void)
+{
+	module_register("otr", "core");
+
+	create_module_dir();
+
+	otr_lib_init();
+
+	user_state_global = otr_init_user_state();
+	g_return_if_fail(user_state_global != NULL);
+
+	signal_add_first("server sendmsg", (SIGNAL_FUNC) sig_server_sendmsg);
+	signal_add_first("message private", (SIGNAL_FUNC) sig_message_private);
+	signal_add("query destroyed", (SIGNAL_FUNC) sig_query_destroyed);
+
+	command_bind_first("quit", NULL, (SIGNAL_FUNC) cmd_quit);
+	command_bind_irc_first("me", NULL, (SIGNAL_FUNC) cmd_me);
+
+	otr_fe_init();
+}
+
+/*
+ * irssi deinit()
+ */
+void otr_core_deinit(void)
+{
+	signal_remove("server sendmsg", (SIGNAL_FUNC) sig_server_sendmsg);
+	signal_remove("message private", (SIGNAL_FUNC) sig_message_private);
+	signal_remove("query destroyed", (SIGNAL_FUNC) sig_query_destroyed);
+
+	otr_fe_deinit();
+
+	command_unbind("quit", (SIGNAL_FUNC) cmd_quit);
+	command_unbind("me", (SIGNAL_FUNC) cmd_me);
+
+	otr_finishall(user_state_global);
+
+	/* Remove glib timer if any. */
+	otr_control_timer(0, NULL);
+
+	otr_free_user_state(user_state_global);
+
+	otr_lib_uninit();
+}
+
+void otr_core_abicheck(int *version)
+{
+	*version = IRSSI_ABI_VERSION;
+}