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-rw-r--r--src/xmpp/biboumi_component.cpp568
1 files changed, 568 insertions, 0 deletions
diff --git a/src/xmpp/biboumi_component.cpp b/src/xmpp/biboumi_component.cpp
new file mode 100644
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--- /dev/null
+++ b/src/xmpp/biboumi_component.cpp
@@ -0,0 +1,568 @@
+#include <xmpp/biboumi_component.hpp>
+
+#include <utils/timed_events.hpp>
+#include <utils/scopeguard.hpp>
+#include <utils/tolower.hpp>
+#include <logger/logger.hpp>
+#include <xmpp/adhoc_command.hpp>
+#include <bridge/list_element.hpp>
+#include <config/config.hpp>
+#include <xmpp/jid.hpp>
+#include <utils/sha1.hpp>
+
+#include <stdexcept>
+#include <iostream>
+
+#include <stdio.h>
+
+#include <louloulibs.h>
+
+#include <uuid.h>
+
+#ifdef SYSTEMD_FOUND
+# include <systemd/sd-daemon.h>
+#endif
+
+using namespace std::string_literals;
+
+static std::set<std::string> kickable_errors{
+ "gone",
+ "internal-server-error",
+ "item-not-found",
+ "jid-malformed",
+ "recipient-unavailable",
+ "redirect",
+ "remote-server-not-found",
+ "remote-server-timeout",
+ "service-unavailable",
+ "malformed-error"
+ };
+
+
+BiboumiComponent::BiboumiComponent(std::shared_ptr<Poller> poller, const std::string& hostname, const std::string& secret):
+ XmppComponent(poller, hostname, secret)
+{
+ this->stanza_handlers.emplace("presence",
+ std::bind(&BiboumiComponent::handle_presence, this,std::placeholders::_1));
+ this->stanza_handlers.emplace("message",
+ std::bind(&BiboumiComponent::handle_message, this,std::placeholders::_1));
+ this->stanza_handlers.emplace("iq",
+ std::bind(&BiboumiComponent::handle_iq, this,std::placeholders::_1));
+
+ this->adhoc_commands_handler.get_commands()= {
+ {"ping", AdhocCommand({&PingStep1}, "Do a ping", false)},
+ {"hello", AdhocCommand({&HelloStep1, &HelloStep2}, "Receive a custom greeting", false)},
+ {"disconnect-user", AdhocCommand({&DisconnectUserStep1, &DisconnectUserStep2}, "Disconnect a user from the gateway", true)},
+ {"reload", AdhocCommand({&Reload}, "Reload biboumi’s configuration", true)}
+ };
+}
+
+void BiboumiComponent::shutdown()
+{
+ for (auto it = this->bridges.begin(); it != this->bridges.end(); ++it)
+ {
+ it->second->shutdown("Gateway shutdown");
+ }
+}
+
+void BiboumiComponent::clean()
+{
+ auto it = this->bridges.begin();
+ while (it != this->bridges.end())
+ {
+ it->second->clean();
+ if (it->second->active_clients() == 0)
+ it = this->bridges.erase(it);
+ else
+ ++it;
+ }
+}
+
+void BiboumiComponent::handle_presence(const Stanza& stanza)
+{
+ std::string from = stanza.get_tag("from");
+ std::string id = stanza.get_tag("id");
+ std::string to_str = stanza.get_tag("to");
+ std::string type = stanza.get_tag("type");
+
+ // Check for mandatory tags
+ if (from.empty())
+ {
+ log_warning("Received an invalid presence stanza: tag 'from' is missing.");
+ return;
+ }
+ if (to_str.empty())
+ {
+ this->send_stanza_error("presence", from, this->served_hostname, id,
+ "modify", "bad-request", "Missing 'to' tag");
+ return;
+ }
+
+ Bridge* bridge = this->get_user_bridge(from);
+ Jid to(to_str);
+ Iid iid(to.local);
+
+ // An error stanza is sent whenever we exit this function without
+ // disabling this scopeguard. If error_type and error_name are not
+ // changed, the error signaled is internal-server-error. Change their
+ // value to signal an other kind of error. For example
+ // feature-not-implemented, etc. Any non-error process should reach the
+ // stanza_error.disable() call at the end of the function.
+ std::string error_type("cancel");
+ std::string error_name("internal-server-error");
+ utils::ScopeGuard stanza_error([&](){
+ this->send_stanza_error("presence", from, to_str, id,
+ error_type, error_name, "");
+ });
+
+ if (iid.is_channel && !iid.get_server().empty())
+ { // presence toward a MUC that corresponds to an irc channel, or a
+ // dummy channel if iid.chan is empty
+ if (type.empty())
+ {
+ const std::string own_nick = bridge->get_own_nick(iid);
+ if (!own_nick.empty() && own_nick != to.resource)
+ bridge->send_irc_nick_change(iid, to.resource);
+ XmlNode* x = stanza.get_child("x", MUC_NS);
+ XmlNode* password = x ? x->get_child("password", MUC_NS): nullptr;
+ bridge->join_irc_channel(iid, to.resource,
+ password ? password->get_inner() : "");
+ }
+ else if (type == "unavailable")
+ {
+ XmlNode* status = stanza.get_child("status", COMPONENT_NS);
+ bridge->leave_irc_channel(std::move(iid), status ? std::move(status->get_inner()) : "");
+ }
+ }
+ else
+ {
+ // An user wants to join an invalid IRC channel, return a presence error to him
+ if (type.empty())
+ this->send_invalid_room_error(to.local, to.resource, from);
+ }
+ stanza_error.disable();
+}
+
+void BiboumiComponent::handle_message(const Stanza& stanza)
+{
+ std::string from = stanza.get_tag("from");
+ std::string id = stanza.get_tag("id");
+ std::string to_str = stanza.get_tag("to");
+ std::string type = stanza.get_tag("type");
+
+ if (from.empty())
+ return;
+ if (type.empty())
+ type = "normal";
+ Bridge* bridge = this->get_user_bridge(from);
+ Jid to(to_str);
+ Iid iid(to.local);
+
+ std::string error_type("cancel");
+ std::string error_name("internal-server-error");
+ utils::ScopeGuard stanza_error([&](){
+ this->send_stanza_error("message", from, to_str, id,
+ error_type, error_name, "");
+ });
+ XmlNode* body = stanza.get_child("body", COMPONENT_NS);
+ if (type == "groupchat" && iid.is_channel)
+ {
+ if (body && !body->get_inner().empty())
+ {
+ bridge->send_channel_message(iid, body->get_inner());
+ }
+ XmlNode* subject = stanza.get_child("subject", COMPONENT_NS);
+ if (subject)
+ bridge->set_channel_topic(iid, subject->get_inner());
+ }
+ else if (type == "error")
+ {
+ const XmlNode* error = stanza.get_child("error", COMPONENT_NS);
+ // Only a set of errors are considered “fatal”. If we encounter one of
+ // them, we purge (we disconnect the user from all the IRC servers).
+ // We consider this to be true, unless the error condition is
+ // specified and is not in the kickable_errors set
+ bool kickable_error = true;
+ if (error && error->has_children())
+ {
+ const XmlNode* condition = error->get_last_child();
+ if (kickable_errors.find(condition->get_name()) == kickable_errors.end())
+ kickable_error = false;
+ }
+ if (kickable_error)
+ bridge->shutdown("Error from remote client");
+ }
+ else if (type == "chat")
+ {
+ if (body && !body->get_inner().empty())
+ {
+ // a message for nick!server
+ if (iid.is_user && !iid.get_local().empty())
+ {
+ bridge->send_private_message(iid, body->get_inner());
+ bridge->remove_preferred_from_jid(iid.get_local());
+ }
+ else if (!iid.is_user && !to.resource.empty())
+ { // a message for chan%server@biboumi/Nick or
+ // server@biboumi/Nick
+ // Convert that into a message to nick!server
+ Iid user_iid(utils::tolower(to.resource) + "!" + iid.get_server());
+ bridge->send_private_message(user_iid, body->get_inner());
+ bridge->set_preferred_from_jid(user_iid.get_local(), to_str);
+ }
+ }
+ }
+ else if (iid.is_user)
+ this->send_invalid_user_error(to.local, from);
+ stanza_error.disable();
+}
+
+// We MUST return an iq, whatever happens, except if the type is
+// "result".
+// To do this, we use a scopeguard. If an exception is raised somewhere, an
+// iq of type error "internal-server-error" is sent. If we handle the
+// request properly (by calling a function that registers an iq to be sent
+// later, or that directly sends an iq), we disable the ScopeGuard. If we
+// reach the end of the function without having disabled the scopeguard, we
+// send a "feature-not-implemented" iq as a result. If an other kind of
+// error is found (for example the feature is implemented in biboumi, but
+// the request is missing some attribute) we can just change the values of
+// error_type and error_name and return from the function (without disabling
+// the scopeguard); an iq error will be sent
+void BiboumiComponent::handle_iq(const Stanza& stanza)
+{
+ std::string id = stanza.get_tag("id");
+ std::string from = stanza.get_tag("from");
+ std::string to_str = stanza.get_tag("to");
+ std::string type = stanza.get_tag("type");
+
+ if (from.empty())
+ return;
+ if (id.empty() || to_str.empty() || type.empty())
+ {
+ this->send_stanza_error("iq", from, this->served_hostname, id,
+ "modify", "bad-request", "");
+ return;
+ }
+
+ Bridge* bridge = this->get_user_bridge(from);
+ Jid to(to_str);
+
+ // These two values will be used in the error iq sent if we don't disable
+ // the scopeguard.
+ std::string error_type("cancel");
+ std::string error_name("internal-server-error");
+ utils::ScopeGuard stanza_error([&](){
+ this->send_stanza_error("iq", from, to_str, id,
+ error_type, error_name, "");
+ });
+ if (type == "set")
+ {
+ XmlNode* query;
+ if ((query = stanza.get_child("query", MUC_ADMIN_NS)))
+ {
+ const XmlNode* child = query->get_child("item", MUC_ADMIN_NS);
+ if (child)
+ {
+ std::string nick = child->get_tag("nick");
+ std::string role = child->get_tag("role");
+ std::string affiliation = child->get_tag("affiliation");
+ if (!nick.empty())
+ {
+ Iid iid(to.local);
+ if (role == "none")
+ { // This is a kick
+ std::string reason;
+ XmlNode* reason_el = child->get_child("reason", MUC_ADMIN_NS);
+ if (reason_el)
+ reason = reason_el->get_inner();
+ bridge->send_irc_kick(iid, nick, reason, id, from);
+ }
+ else
+ bridge->forward_affiliation_role_change(iid, nick, affiliation, role);
+ stanza_error.disable();
+ }
+ }
+ }
+ else if ((query = stanza.get_child("command", ADHOC_NS)))
+ {
+ Stanza response("iq");
+ response["to"] = from;
+ response["from"] = this->served_hostname;
+ response["id"] = id;
+ XmlNode inner_node = this->adhoc_commands_handler.handle_request(from, *query);
+ if (inner_node.get_child("error", ADHOC_NS))
+ response["type"] = "error";
+ else
+ response["type"] = "result";
+ response.add_child(std::move(inner_node));
+ response.close();
+ this->send_stanza(response);
+ stanza_error.disable();
+ }
+ }
+ else if (type == "get")
+ {
+ XmlNode* query;
+ if ((query = stanza.get_child("query", DISCO_INFO_NS)))
+ { // Disco info
+ if (to_str == this->served_hostname)
+ {
+ const std::string node = query->get_tag("node");
+ if (node.empty())
+ {
+ // On the gateway itself
+ this->send_self_disco_info(id, from);
+ stanza_error.disable();
+ }
+ }
+ }
+ else if ((query = stanza.get_child("query", VERSION_NS)))
+ {
+ Iid iid(to.local);
+ if (iid.is_user ||
+ (iid.is_channel && !to.resource.empty()))
+ {
+ // Get the IRC user version
+ std::string target;
+ if (iid.is_user)
+ target = iid.get_local();
+ else
+ target = to.resource;
+ bridge->send_irc_version_request(iid.get_server(), target, id,
+ from, to_str);
+ }
+ else
+ {
+ // On the gateway itself or on a channel
+ this->send_version(id, from, to_str);
+ }
+ stanza_error.disable();
+ }
+ else if ((query = stanza.get_child("query", DISCO_ITEMS_NS)))
+ {
+ Iid iid(to.local);
+ const std::string node = query->get_tag("node");
+ if (node == ADHOC_NS)
+ {
+ this->send_adhoc_commands_list(id, from);
+ stanza_error.disable();
+ }
+ else if (node.empty() && !iid.is_user && !iid.is_channel)
+ { // Disco on an IRC server: get the list of channels
+ bridge->send_irc_channel_list_request(iid, id, from);
+ stanza_error.disable();
+ }
+ }
+ else if ((query = stanza.get_child("ping", PING_NS)))
+ {
+ Iid iid(to.local);
+ if (iid.is_user)
+ { // Ping any user (no check on the nick done ourself)
+ bridge->send_irc_user_ping_request(iid.get_server(),
+ iid.get_local(), id, from, to_str);
+ }
+ else if (iid.is_channel && !to.resource.empty())
+ { // Ping a room participant (we check if the nick is in the room)
+ bridge->send_irc_participant_ping_request(iid,
+ to.resource, id, from, to_str);
+ }
+ else
+ { // Ping a channel, a server or the gateway itself
+ bridge->on_gateway_ping(iid.get_server(),
+ id, from, to_str);
+ }
+ stanza_error.disable();
+ }
+ }
+ else if (type == "result")
+ {
+ stanza_error.disable();
+ XmlNode* query;
+ if ((query = stanza.get_child("query", VERSION_NS)))
+ {
+ XmlNode* name_node = query->get_child("name", VERSION_NS);
+ XmlNode* version_node = query->get_child("version", VERSION_NS);
+ XmlNode* os_node = query->get_child("os", VERSION_NS);
+ std::string name;
+ std::string version;
+ std::string os;
+ if (name_node)
+ name = name_node->get_inner() + " (through the biboumi gateway)";
+ if (version_node)
+ version = version_node->get_inner();
+ if (os_node)
+ os = os_node->get_inner();
+ const Iid iid(to.local);
+ bridge->send_xmpp_version_to_irc(iid, name, version, os);
+ }
+ else
+ {
+ const auto it = this->waiting_iq.find(id);
+ if (it != this->waiting_iq.end())
+ {
+ it->second(bridge, stanza);
+ this->waiting_iq.erase(it);
+ }
+ }
+ }
+ error_type = "cancel";
+ error_name = "feature-not-implemented";
+}
+
+Bridge* BiboumiComponent::get_user_bridge(const std::string& user_jid)
+{
+ try
+ {
+ return this->bridges.at(user_jid).get();
+ }
+ catch (const std::out_of_range& exception)
+ {
+ this->bridges.emplace(user_jid, std::make_unique<Bridge>(user_jid, this, this->poller));
+ return this->bridges.at(user_jid).get();
+ }
+}
+
+Bridge* BiboumiComponent::find_user_bridge(const std::string& user_jid)
+{
+ try
+ {
+ return this->bridges.at(user_jid).get();
+ }
+ catch (const std::out_of_range& exception)
+ {
+ return nullptr;
+ }
+}
+
+std::list<Bridge*> BiboumiComponent::get_bridges() const
+{
+ std::list<Bridge*> res;
+ for (auto it = this->bridges.begin(); it != this->bridges.end(); ++it)
+ res.push_back(it->second.get());
+ return res;
+}
+
+void BiboumiComponent::send_self_disco_info(const std::string& id, const std::string& jid_to)
+{
+ Stanza iq("iq");
+ iq["type"] = "result";
+ iq["id"] = id;
+ iq["to"] = jid_to;
+ iq["from"] = this->served_hostname;
+ XmlNode query("query");
+ query["xmlns"] = DISCO_INFO_NS;
+ XmlNode identity("identity");
+ identity["category"] = "conference";
+ identity["type"] = "irc";
+ identity["name"] = "Biboumi XMPP-IRC gateway";
+ identity.close();
+ query.add_child(std::move(identity));
+ for (const std::string& ns: {DISCO_INFO_NS, MUC_NS, ADHOC_NS})
+ {
+ XmlNode feature("feature");
+ feature["var"] = ns;
+ feature.close();
+ query.add_child(std::move(feature));
+ }
+ query.close();
+ iq.add_child(std::move(query));
+ iq.close();
+ this->send_stanza(iq);
+}
+
+void BiboumiComponent::send_adhoc_commands_list(const std::string& id, const std::string& requester_jid)
+{
+ Stanza iq("iq");
+ iq["type"] = "result";
+ iq["id"] = id;
+ iq["to"] = requester_jid;
+ iq["from"] = this->served_hostname;
+ XmlNode query("query");
+ query["xmlns"] = DISCO_ITEMS_NS;
+ query["node"] = ADHOC_NS;
+ for (const auto& kv: this->adhoc_commands_handler.get_commands())
+ {
+ XmlNode item("item");
+ item["jid"] = this->served_hostname;
+ item["node"] = kv.first;
+ item["name"] = kv.second.name;
+ item.close();
+ query.add_child(std::move(item));
+ }
+ query.close();
+ iq.add_child(std::move(query));
+ iq.close();
+ this->send_stanza(iq);
+}
+
+void BiboumiComponent::send_iq_version_request(const std::string& from,
+ const std::string& jid_to)
+{
+ Stanza iq("iq");
+ iq["type"] = "get";
+ iq["id"] = "version_"s + this->next_id();
+ iq["from"] = from + "@" + this->served_hostname;
+ iq["to"] = jid_to;
+ XmlNode query("query");
+ query["xmlns"] = VERSION_NS;
+ query.close();
+ iq.add_child(std::move(query));
+ iq.close();
+ this->send_stanza(iq);
+}
+
+void BiboumiComponent::send_ping_request(const std::string& from,
+ const std::string& jid_to,
+ const std::string& id)
+{
+ Stanza iq("iq");
+ iq["type"] = "get";
+ iq["id"] = id;
+ iq["from"] = from + "@" + this->served_hostname;
+ iq["to"] = jid_to;
+ XmlNode ping("ping");
+ ping["xmlns"] = PING_NS;
+ ping.close();
+ iq.add_child(std::move(ping));
+ iq.close();
+ this->send_stanza(iq);
+
+ auto result_cb = [from, id](Bridge* bridge, const Stanza& stanza)
+ {
+ Jid to(stanza.get_tag("to"));
+ if (to.local != from)
+ {
+ log_error("Received a corresponding ping result, but the 'to' from "
+ "the response mismatches the 'from' of the request");
+ }
+ else
+ bridge->send_irc_ping_result(from, id);
+ };
+ this->waiting_iq[id] = result_cb;
+}
+
+void BiboumiComponent::send_iq_room_list_result(const std::string& id,
+ const std::string to_jid,
+ const std::string& from,
+ const std::vector<ListElement>& rooms_list)
+{
+ Stanza iq("iq");
+ iq["from"] = from + "@" + this->served_hostname;
+ iq["to"] = to_jid;
+ iq["id"] = id;
+ iq["type"] = "result";
+ XmlNode query("query");
+ query["xmlns"] = DISCO_ITEMS_NS;
+ for (const auto& room: rooms_list)
+ {
+ XmlNode item("item");
+ item["jid"] = room.channel + "%" + from + "@" + this->served_hostname;
+ item.close();
+ query.add_child(std::move(item));
+ }
+ query.close();
+ iq.add_child(std::move(query));
+ iq.close();
+ this->send_stanza(iq);
+}