int hub_handle_password(struct hub_info* hub, struct hub_user* u, struct adc_message* cmd)
{
char* password = adc_msg_get_argument(cmd, 0);
int ret = 0;
if (u->state == state_verify)
{
if (acl_password_verify(hub, u, password))
{
on_login_success(hub, u);
}
else
{
on_login_failure(hub, u, status_msg_auth_invalid_password);
ret = -1;
}
}
hub_free(password);
return ret;
}
/*
* If user is in the connecting state, we need to do fairly
* strict checking of all arguments.
* This means we disconnect users when they provide invalid data
* during the login sequence.
* When users are merely updating their data after successful login
* we can just ignore any invalid data and not broadcast it.
*
* The data we need to check is:
* - nick name (valid, not taken, etc)
* - CID/PID (valid, not taken, etc).
* - IP addresses (IPv4 and IPv6)
*/
int hub_handle_info(struct hub_info* hub, struct hub_user* user, const struct adc_message* cmd_unmodified)
{
int ret;
struct adc_message* cmd = adc_msg_copy(cmd_unmodified);
if (!cmd) return -1; /* OOM */
cmd->priority = 1;
hub_handle_info_common(user, cmd);
/* If user is logging in, perform more checks,
otherwise only a few things need to be checked.
*/
if (user_is_connecting(user))
{
/*
* Don't allow the user to send multiple INF messages in this stage!
* Since that can have serious side-effects.
*/
if (user->info)
{
adc_msg_free(cmd);
return 0;
}
ret = hub_handle_info_login(hub, user, cmd);
if (ret < 0)
{
on_login_failure(hub, user, ret);
adc_msg_free(cmd);
return -1;
}
else
{
/* Post a message, the user has joined */
struct event_data post;
memset(&post, 0, sizeof(post));
post.id = UHUB_EVENT_USER_JOIN;
post.ptr = user;
post.flags = ret; /* 0 - all OK, 1 - need authentication */
event_queue_post(hub->queue, &post);
adc_msg_free(cmd);
return 0;
}
}
else
{
/* These must not be allowed updated, let's remove them! */
adc_msg_remove_named_argument(cmd, ADC_INF_FLAG_PRIVATE_ID);
adc_msg_remove_named_argument(cmd, ADC_INF_FLAG_CLIENT_ID);
/*
* If the nick is not accepted, do not relay it.
* Otherwise, the nickname will be updated.
*/
if (adc_msg_has_named_argument(cmd, ADC_INF_FLAG_NICK))
{
#ifdef ALLOW_CHANGE_NICK
if (!check_nick(hub, user, cmd))
#endif
adc_msg_remove_named_argument(cmd, ADC_INF_FLAG_NICK);
}
ret = check_limits(hub, user, cmd);
if (ret < 0)
{
on_update_failure(hub, user, ret);
adc_msg_free(cmd);
return -1;
}
strip_network(user, cmd);
hub_handle_info_low_bandwidth(hub, user, cmd);
user_update_info(user, cmd);
if (!adc_msg_is_empty(cmd))
{
route_message(hub, user, cmd);
}
adc_msg_free(cmd);
}
return 0;
}
static void hub_event_dispatcher(void* callback_data, struct event_data* message)
{
int status;
struct hub_info* hub = (struct hub_info*) callback_data;
struct hub_user* user = (struct hub_user*) message->ptr;
uhub_assert(hub != NULL);
switch (message->id)
{
case UHUB_EVENT_USER_JOIN:
{
if (user_is_disconnecting(user))
break;
if (message->flags)
{
hub_send_password_challenge(hub, user);
}
else
{
/* Race condition, we could have two messages for two logins queued up.
So make sure we don't let the second client in. */
status = check_duplicate_logins_ok(hub, user);
if (!status)
{
on_login_success(hub, user);
}
else
{
on_login_failure(hub, user, (enum status_message) status);
}
}
break;
}
case UHUB_EVENT_USER_QUIT:
{
uman_remove(hub->users, user);
uman_send_quit_message(hub, hub->users, user);
on_logout_user(hub, user);
hub_schedule_destroy_user(hub, user);
break;
}
case UHUB_EVENT_USER_DESTROY:
{
user_destroy(user);
break;
}
case UHUB_EVENT_HUB_SHUTDOWN:
{
struct hub_user* u = (struct hub_user*) list_get_first(hub->users->list);
while (u)
{
uman_remove(hub->users, u);
user_destroy(u);
u = (struct hub_user*) list_get_first(hub->users->list);
}
break;
}
default:
/* FIXME: ignored */
break;
}
}
int hub_handle_support(struct hub_info* hub, struct hub_user* u, struct adc_message* cmd)
{
int ret = 0;
int index = 0;
int ok = 1;
char* arg = adc_msg_get_argument(cmd, index);
if (hub->status == hub_status_disabled && u->state == state_protocol)
{
on_login_failure(hub, u, status_msg_hub_disabled);
hub_free(arg);
return -1;
}
while (arg)
{
if (strlen(arg) == 6)
{
fourcc_t fourcc = FOURCC(arg[2], arg[3], arg[4], arg[5]);
if (strncmp(arg, ADC_SUP_FLAG_ADD, 2) == 0)
{
user_support_add(u, fourcc);
}
else if (strncmp(arg, ADC_SUP_FLAG_REMOVE, 2) == 0)
{
user_support_remove(u, fourcc);
}
else
{
ok = 0;
}
}
else
{
ok = 0;
}
index++;
hub_free(arg);
arg = adc_msg_get_argument(cmd, index);
}
if (u->state == state_protocol)
{
if (index == 0) ok = 0; /* Need to support *SOMETHING*, at least BASE */
if (!ok)
{
/* disconnect user. Do not send crap during initial handshake! */
hub_disconnect_user(hub, u, quit_logon_error);
return -1;
}
if (user_flag_get(u, feature_base))
{
/* User supports ADC/1.0 and a hash we know */
if (user_flag_get(u, feature_tiger))
{
hub_send_handshake(hub, u);
/* TODO: timeouts for mux users */
if (u->connection)
net_con_set_timeout(u->connection, TIMEOUT_HANDSHAKE);
}
else
{
// no common hash algorithm.
hub_send_status(hub, u, status_msg_proto_no_common_hash, status_level_fatal);
hub_disconnect_user(hub, u, quit_protocol_error);
}
}
else if (user_flag_get(u, feature_bas0))
{
if (hub->config->obsolete_clients)
{
hub_send_handshake(hub, u);
/* TODO: timeouts for mux users */
if (u->connection)
net_con_set_timeout(u->connection, TIMEOUT_HANDSHAKE);
}
else
{
/* disconnect user for using an obsolete client. */
char* tmp = adc_msg_escape(hub->config->msg_proto_obsolete_adc0);
struct adc_message* message = adc_msg_construct(ADC_CMD_IMSG, 6 + strlen(tmp));
adc_msg_add_argument(message, tmp);
hub_free(tmp);
route_to_user(hub, u, message);
adc_msg_free(message);
hub_disconnect_user(hub, u, quit_protocol_error);
}
}
else
{
/* Not speaking a compatible protocol - just disconnect. */
hub_disconnect_user(hub, u, quit_logon_error);
}
}
return ret;
}
