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/*
* sip-connection-helpers.c - Helper routines used by RakiaConnection
* Copyright (C) 2005 Collabora Ltd.
* Copyright (C) 2006-2009 Nokia Corporation
*
* This work is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This work 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <telepathy-glib/enums.h>
#include <telepathy-glib/errors.h>
#include <telepathy-glib/dbus.h>
#include <telepathy-glib/interfaces.h>
#include <telepathy-glib/svc-connection.h>
#include <rakia/util.h>
#include <rakia/handles.h>
#include "sip-connection-helpers.h"
#include <sofia-sip/sip.h>
#include <sofia-sip/sip_header.h>
#include <sofia-sip/tport_tag.h>
#include "sip-connection-private.h"
#define DEBUG_FLAG RAKIA_DEBUG_CONNECTION
#include "rakia/debug.h"
/* Default keepalive timeout in seconds,
* a value obtained from Sofia-SIP documentation */
#define RAKIA_CONNECTION_DEFAULT_KEEPALIVE_INTERVAL 120
/* The user is not allowed to set keepalive timeout to lower than that,
* to avoid wasting traffic and device power */
#define RAKIA_CONNECTION_MINIMUM_KEEPALIVE_INTERVAL 30
/* The user is not allowed to set keepalive timeout to lower than that
* for REGISTER keepalives, to avoid wasting traffic and device power.
* REGISTER is special because it may tie resources on the server side */
#define RAKIA_CONNECTION_MINIMUM_KEEPALIVE_INTERVAL_REGISTER 50
static sip_to_t *
priv_sip_to_url_make (RakiaConnection *conn,
su_home_t *home,
TpHandle contact)
{
const url_t *url;
url = rakia_base_connection_handle_to_uri (
(RakiaBaseConnection *) conn, contact);
return sip_to_create (home, (const url_string_t *) url);
}
static sip_from_t *
priv_sip_from_url_make (RakiaConnection *conn,
su_home_t *home)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
sip_from_t *from;
gchar *alias = NULL;
from = sip_from_create (home, (const url_string_t *) priv->account_url);
if (from == NULL)
return NULL;
g_object_get (conn, "alias", &alias, NULL);
if (alias != NULL)
{
gchar *alias_quoted;
/* Make the alias into a quoted string, escaping all characters
* that cannot go verbatim into a quoted string */
alias_quoted = rakia_quote_string (alias);
g_free (alias);
from->a_display = su_strdup (home, alias_quoted);
g_free (alias_quoted);
}
return from;
}
nua_handle_t *
rakia_conn_create_register_handle (RakiaConnection *conn,
TpHandle contact)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
nua_handle_t *result = NULL;
su_home_t temphome[1] = { SU_HOME_INIT(temphome) };
sip_to_t *to;
g_assert (priv->sofia_home != NULL);
g_assert (priv->sofia_nua != NULL);
to = priv_sip_to_url_make (conn, temphome, contact);
if (to)
result = nua_handle (priv->sofia_nua, NULL, SIPTAG_TO(to), TAG_END());
su_home_deinit (temphome);
return result;
}
nua_handle_t *
rakia_conn_create_request_handle (RakiaConnection *conn,
TpHandle contact)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
nua_handle_t *result = NULL;
su_home_t temphome[1] = { SU_HOME_INIT(temphome) };
sip_from_t *from;
sip_to_t *to;
g_assert (priv->sofia_home != NULL);
g_assert (priv->sofia_nua != NULL);
to = priv_sip_to_url_make (conn, temphome, contact);
from = priv_sip_from_url_make (conn, temphome);
if (to != NULL && from != NULL)
result = nua_handle (priv->sofia_nua, NULL,
NUTAG_URL(to->a_url),
SIPTAG_TO(to),
SIPTAG_FROM(from),
TAG_END());
su_home_deinit (temphome);
return result;
}
void
rakia_conn_update_proxy_and_transport (RakiaConnection *conn)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
if (priv->proxy_url != NULL)
{
su_home_t temphome[1] = { SU_HOME_INIT(temphome) };
sip_route_t *route = NULL;
const char *params = NULL;
if (priv->loose_routing)
{
url_t *route_url;
route_url = url_hdup (temphome, priv->proxy_url);
g_return_if_fail (route_url != NULL);
if (!url_has_param (route_url, "lr"))
url_param_add (temphome, route_url, "lr");
route = sip_route_create (temphome, route_url, NULL);
}
if (priv->transport != NULL && priv->proxy_url->url_type == url_sip)
{
if (g_ascii_strcasecmp (priv->transport, "tcp") == 0)
params = "transport=tcp";
else if (g_ascii_strcasecmp (priv->transport, "udp") == 0)
params = "transport=udp";
else
WARNING ("unrecognized transport parameter value: %s", priv->transport);
}
nua_set_params (priv->sofia_nua,
TAG_IF(route, NUTAG_INITIAL_ROUTE(route)),
TAG_IF(!priv->loose_routing,
NUTAG_PROXY(priv->proxy_url)),
TAG_IF(params, NUTAG_M_PARAMS(params)),
TAG_NULL());
su_home_deinit (temphome);
}
}
const url_t *
rakia_conn_get_local_url (RakiaConnection *conn)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
url_t *url;
url = url_make (priv->sofia_home, "sip:*:*");
if (url == NULL)
return NULL;
if (priv->proxy_url != NULL)
{
url->url_type = priv->proxy_url->url_type;
}
else
{
g_assert (priv->account_url != NULL);
url->url_type = priv->account_url->url_type;
}
if (priv->local_ip_address == NULL)
url->url_host = "0";
else
url->url_host = priv->local_ip_address;
if (priv->local_port == 0)
url->url_port = "*";
else
url->url_port = su_sprintf (priv->sofia_home, "%u", priv->local_port);
if (url->url_type == url_sip && priv->transport != NULL)
{
if (!g_ascii_strcasecmp(priv->transport, "udp"))
url->url_params = "transport=udp";
else if (!g_ascii_strcasecmp(priv->transport, "tcp"))
url->url_params = "transport=tcp";
}
/* url_sanitize (url); -- we're always sane B-] */
DEBUG("local binding expressed as <" URL_PRINT_FORMAT ">", URL_PRINT_ARGS(url));
return url;
}
static GHashTable*
priv_nua_get_outbound_options (nua_t* nua)
{
const char* outbound = NULL;
GHashTable* option_table;
gchar** options;
gchar* token;
gboolean value;
int i;
option_table = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
NULL);
nua_get_params (nua, NUTAG_OUTBOUND_REF(outbound), TAG_END());
if (outbound == NULL)
return option_table;
DEBUG ("got outbound options %s", outbound);
options = g_strsplit_set (outbound, " ", 0);
for (i = 0; (token = options[i]) != NULL; i++)
{
value = TRUE;
/* Look for the negation prefixes */
if (g_ascii_strncasecmp (token, "no", 2) == 0)
switch (token[2])
{
case '-':
case '_':
token += 3;
value = FALSE;
break;
case 'n':
case 'N':
switch (token[3])
{
case '-':
case '_':
token += 4;
value = FALSE;
break;
}
break;
}
g_hash_table_insert (option_table,
g_strdup (token),
GINT_TO_POINTER(value));
}
g_strfreev (options);
return option_table;
}
static void
priv_nua_outbound_vectorize_walk (gpointer key,
gpointer value,
gpointer user_data)
{
gchar ***pstrv = (gchar ***)user_data;
const gchar *option = (const gchar *)key;
*(*pstrv)++ = (value)? g_strdup (option) : g_strdup_printf ("no-%s", option);
}
static void
priv_nua_set_outbound_options (nua_t* nua, GHashTable* option_table)
{
gchar* outbound;
gchar** options;
gchar** walker;
/* construct the option string array */
options = g_new(gchar*, g_hash_table_size (option_table) + 1);
/* fill the array with option tokens and terminate with NULL */
walker = options;
g_hash_table_foreach (option_table, priv_nua_outbound_vectorize_walk, &walker);
*walker = NULL;
/* concatenate all tokens into a string */
outbound = g_strjoinv (" ", options);
g_strfreev (options);
g_assert (outbound != NULL);
/* deliver the option string to the stack */
DEBUG ("setting outbound options %s", outbound);
nua_set_params (nua, NUTAG_OUTBOUND(outbound), TAG_NULL());
g_free (outbound);
}
void
rakia_conn_update_nua_outbound (RakiaConnection *conn)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
GHashTable *option_table;
g_return_if_fail (priv->sofia_nua != NULL);
option_table = priv_nua_get_outbound_options (priv->sofia_nua);
/* Purge existing occurrences of the affected options */
g_hash_table_remove (option_table, "options-keepalive");
/* Set options that affect keepalive behavior */
switch (priv->keepalive_mechanism)
{
case RAKIA_CONNECTION_KEEPALIVE_NONE:
case RAKIA_CONNECTION_KEEPALIVE_REGISTER:
/* For REGISTER keepalives, we use NUTAG_M_FEATURES */
g_hash_table_insert (option_table,
g_strdup ("options-keepalive"),
GINT_TO_POINTER(FALSE));
break;
case RAKIA_CONNECTION_KEEPALIVE_OPTIONS:
g_hash_table_insert (option_table,
g_strdup ("options-keepalive"),
GINT_TO_POINTER(TRUE));
break;
case RAKIA_CONNECTION_KEEPALIVE_STUN:
/* Not supported */
break;
case RAKIA_CONNECTION_KEEPALIVE_AUTO:
default:
break;
}
g_hash_table_insert (option_table,
g_strdup ("natify"),
GINT_TO_POINTER(priv->discover_binding));
g_hash_table_insert (option_table,
g_strdup ("use-rport"),
GINT_TO_POINTER(priv->discover_binding));
/* Hand options back to the NUA */
priv_nua_set_outbound_options (priv->sofia_nua, option_table);
g_hash_table_unref (option_table);
}
static void
priv_sanitize_keepalive_interval (RakiaConnectionPrivate *priv)
{
guint minimum_interval;
if (priv->keepalive_interval != 0)
{
minimum_interval =
(priv->keepalive_mechanism == RAKIA_CONNECTION_KEEPALIVE_REGISTER)
? RAKIA_CONNECTION_MINIMUM_KEEPALIVE_INTERVAL_REGISTER
: RAKIA_CONNECTION_MINIMUM_KEEPALIVE_INTERVAL;
if (priv->keepalive_interval < minimum_interval)
{
WARNING ("keepalive interval is too low, pushing to %u", minimum_interval);
priv->keepalive_interval = minimum_interval;
}
}
}
void
rakia_conn_update_nua_keepalive_interval (RakiaConnection *conn)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
long keepalive_interval;
if (!priv->keepalive_interval_specified)
return;
if (priv->keepalive_mechanism == RAKIA_CONNECTION_KEEPALIVE_NONE)
keepalive_interval = 0;
else
{
priv_sanitize_keepalive_interval (priv);
keepalive_interval = (long) priv->keepalive_interval;
}
keepalive_interval *= 1000;
DEBUG("setting keepalive interval to %ld msec", keepalive_interval);
nua_set_params (priv->sofia_nua,
NUTAG_KEEPALIVE(keepalive_interval),
TPTAG_KEEPALIVE(keepalive_interval),
TAG_NULL());
}
void
rakia_conn_update_nua_contact_features (RakiaConnection *conn)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
char *contact_features;
guint timeout;
if (priv->keepalive_mechanism != RAKIA_CONNECTION_KEEPALIVE_REGISTER)
return;
if (priv->keepalive_interval == 0)
return;
priv_sanitize_keepalive_interval (priv);
timeout = priv->keepalive_interval_specified
? priv->keepalive_interval
: RAKIA_CONNECTION_DEFAULT_KEEPALIVE_INTERVAL;
contact_features = g_strdup_printf ("expires=%u", timeout);
nua_set_params(priv->sofia_nua,
NUTAG_M_FEATURES(contact_features),
TAG_NULL());
g_free (contact_features);
}
static void
rakia_conn_set_stun_server_address (RakiaConnection *conn, const gchar *address)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
g_return_if_fail (priv->media_manager != NULL);
g_object_set (priv->media_manager,
"stun-server", address,
"stun-port", priv->stun_port,
NULL);
}
static void
priv_stun_resolver_cb (sres_context_t *ctx, sres_query_t *query, sres_record_t **answers)
{
RakiaConnection *conn = RAKIA_CONNECTION (ctx);
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
sres_a_record_t *ans = NULL;
if (NULL != answers)
{
int i;
GPtrArray *items = g_ptr_array_sized_new (1);
for (i = 0; NULL != answers[i]; i++)
{
if ((0 == answers[i]->sr_record->r_status)
&& (sres_type_a == answers[i]->sr_record->r_type))
{
g_ptr_array_add (items, answers[i]->sr_a);
}
}
if (items->len > 0)
{
ans = g_ptr_array_index (items, g_random_int_range (0, items->len));
}
g_ptr_array_unref (items);
}
if (NULL != ans)
rakia_conn_set_stun_server_address (conn,
inet_ntoa (ans->a_addr));
else
MESSAGE ("could not resolve STUN server address, ignoring");
sres_free_answers (priv->sofia_resolver, answers);
}
void
rakia_conn_resolv_stun_server (RakiaConnection *conn, const gchar *stun_host)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
struct in_addr test_addr;
if (stun_host == NULL)
{
rakia_conn_set_stun_server_address (conn, NULL);
return;
}
/* FIXME: support IPv6 as well */
if (inet_aton (stun_host, &test_addr))
{
rakia_conn_set_stun_server_address (conn, stun_host);
return;
}
if (NULL == priv->sofia_resolver)
{
su_root_t *root = NULL;
g_object_get (conn, "sofia-root", &root, NULL);
priv->sofia_resolver = sres_resolver_create (root, NULL, TAG_END());
g_return_if_fail (priv->sofia_resolver != NULL);
}
DEBUG("creating a new resolver query for STUN host name %s", stun_host);
sres_query (priv->sofia_resolver,
priv_stun_resolver_cb,
(sres_context_t *) conn,
sres_type_a,
stun_host);
}
static void
priv_stun_discover_cb (sres_context_t *ctx,
sres_query_t *query,
sres_record_t **answers)
{
RakiaConnection *conn = RAKIA_CONNECTION (ctx);
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
sres_srv_record_t *sel = NULL;
guint n_sel_items = 0;
guint i;
if (answers == NULL)
return;
for (i = 0; NULL != answers[i]; i++)
{
if (answers[i]->sr_record->r_status != 0)
continue;
if (G_UNLIKELY (answers[i]->sr_record->r_type != sres_type_srv))
continue;
if (sel == NULL
|| (answers[i]->sr_srv->srv_priority < sel->srv_priority))
{
sel = answers[i]->sr_srv;
n_sel_items = 1;
}
else if (answers[i]->sr_srv->srv_priority == sel->srv_priority)
{
n_sel_items++;
}
}
if (n_sel_items > 1)
{
/* Random selection procedure as recommended in RFC 2782 */
GArray *items = g_array_sized_new (FALSE,
TRUE,
sizeof (sres_srv_record_t *),
n_sel_items);
int sum = 0;
int dice;
sres_srv_record_t *rec;
g_assert (sel != NULL);
for (i = 0; NULL != answers[i]; i++)
{
if (answers[i]->sr_record->r_status != 0)
continue;
if (G_UNLIKELY (answers[i]->sr_record->r_type != sres_type_srv))
continue;
rec = answers[i]->sr_srv;
if (rec->srv_priority != sel->srv_priority)
continue;
if (rec->srv_weight == 0)
g_array_prepend_val (items, rec);
else
g_array_append_val (items, rec);
}
g_assert (n_sel_items == items->len);
for (i = 0; i < n_sel_items; i++)
{
rec = g_array_index (items, sres_srv_record_t *, i);
sum = (rec->srv_weight += sum);
}
dice = g_random_int_range (0, sum + 1);
for (i = 0; i < n_sel_items; i++)
{
rec = g_array_index (items, sres_srv_record_t *, i);
if (rec->srv_weight >= dice)
{
sel = rec;
break;
}
}
g_array_unref (items);
}
if (sel != NULL)
{
DEBUG ("discovery got STUN server %s:%u",
sel->srv_target, sel->srv_port);
priv->stun_port = sel->srv_port;
rakia_conn_resolv_stun_server (conn, sel->srv_target);
}
sres_free_answers (priv->sofia_resolver, answers);
}
void
rakia_conn_discover_stun_server (RakiaConnection *conn)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
const char *url_host;
char *srv_domain;
struct in_addr test_addr;
g_return_if_fail (priv->account_url != NULL);
url_host = priv->account_url->url_host;
if (url_host == NULL)
{
DEBUG("unknown domain, not making STUN SRV lookup");
return;
}
/* FIXME: support IPv6 as well */
if (inet_aton (url_host, &test_addr))
{
DEBUG("AOR URI has IP address, not making STUN SRV lookup");
return;
}
if (NULL == priv->sofia_resolver)
{
su_root_t *root = NULL;
g_object_get (conn, "sofia-root", &root, NULL);
priv->sofia_resolver = sres_resolver_create (root, NULL, TAG_END());
g_return_if_fail (priv->sofia_resolver != NULL);
}
DEBUG("creating a new STUN SRV query for domain %s", url_host);
srv_domain = g_strdup_printf ("_stun._udp.%s", url_host);
sres_query (priv->sofia_resolver,
priv_stun_discover_cb,
(sres_context_t *) conn,
sres_type_srv,
srv_domain);
g_free (srv_domain);
}
gchar *
rakia_handle_normalize (TpHandleRepoIface *repo,
const gchar *sipuri,
gpointer context,
GError **error)
{
RakiaConnection *conn = RAKIA_CONNECTION (context);
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (conn);
return rakia_normalize_contact (sipuri, priv->account_url, priv->transport,
error);
}
#ifdef HAVE_LIBIPHB
static gushort
recommended_intervals[] = {
IPHB_GS_WAIT_10_HOURS,
IPHB_GS_WAIT_2_HOURS,
IPHB_GS_WAIT_1_HOUR,
IPHB_GS_WAIT_30_MINS,
IPHB_GS_WAIT_10_MINS * 2, /* It aligns with the 1 hour slot. */
IPHB_GS_WAIT_10_MINS,
IPHB_GS_WAIT_5_MINS,
IPHB_GS_WAIT_2_5_MINS,
IPHB_GS_WAIT_30_SEC};
static gushort
get_system_sync_interval (guint max_interval)
{
guint i;
for (i = 0; i < G_N_ELEMENTS (recommended_intervals); i++)
{
if (recommended_intervals[i] <= max_interval)
return recommended_intervals[i];
}
return (gushort) MIN (max_interval, G_MAXUSHORT);
}
static void
heartbeat_schedule_wait (RakiaConnection *self)
{
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (self);
gushort interval;
/* Passing the same minimum and maximum interval to iphb_wait() means
* that the iphb daemon will wake us up when its internal time is a
* multiple of the interval.
* By using recommended intervals across the platform we can get
* multiple processes waken up at the same time. */
interval = get_system_sync_interval (priv->keepalive_interval);
DEBUG ("requested %hd as maximum interval; using the recommended %hu "
"interval", priv->keepalive_interval, interval);
if (iphb_wait (priv->heartbeat, interval, interval, 0) < 0)
{
WARNING ("iphb_wait failed");
rakia_conn_heartbeat_shutdown (self);
}
}
static int
heartbeat_wakeup (su_root_magic_t *foo,
su_wait_t *wait,
void *user_data)
{
RakiaConnection *self = (RakiaConnection *) user_data;
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (self);
DEBUG("tick");
g_assert (priv->heartbeat != NULL);
if ((wait->revents & (SU_WAIT_IN | SU_WAIT_HUP | SU_WAIT_ERR)) != SU_WAIT_IN)
{
WARNING ("heartbeat descriptor invalidated prematurely with event mask %hd", wait->revents);
rakia_conn_heartbeat_shutdown (self);
return 0;
}
heartbeat_schedule_wait (self);
return 0;
}
#endif /* HAVE_LIBIPHB */
void
rakia_conn_heartbeat_init (RakiaConnection *self)
{
#ifdef HAVE_LIBIPHB
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (self);
int wait_id;
int reference_interval = 0;
su_root_t *root = NULL;
g_assert (priv->heartbeat == NULL);
priv->heartbeat = iphb_open (&reference_interval);
if (priv->heartbeat == NULL)
{
WARNING ("opening IP heartbeat failed: %s", strerror (errno));
return;
}
DEBUG("heartbeat opened with reference interval %d", reference_interval);
su_wait_init (priv->heartbeat_wait);
if (su_wait_create (priv->heartbeat_wait,
iphb_get_fd (priv->heartbeat),
SU_WAIT_IN) != 0)
rakia_log (DEBUG_FLAG, G_LOG_LEVEL_CRITICAL,
"could not create a wait object");
g_object_get (self, "sofia-root", &root, NULL);
wait_id = su_root_register (root,
priv->heartbeat_wait, heartbeat_wakeup, self, 0);
g_return_if_fail (wait_id > 0);
priv->heartbeat_wait_id = wait_id;
heartbeat_schedule_wait (self);
#endif /* HAVE_LIBIPHB */
}
void
rakia_conn_heartbeat_shutdown (RakiaConnection *self)
{
#ifdef HAVE_LIBIPHB
RakiaConnectionPrivate *priv = RAKIA_CONNECTION_GET_PRIVATE (self);
su_root_t *root = NULL;
if (priv->heartbeat_wait_id == 0)
return;
g_object_get (self, "sofia-root", &root, NULL);
su_root_deregister (root, priv->heartbeat_wait_id);
priv->heartbeat_wait_id = 0;
su_wait_destroy (priv->heartbeat_wait);
iphb_close (priv->heartbeat);
priv->heartbeat = NULL;
#endif /* HAVE_LIBIPHB */
}
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