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rtp_relay_ctx.c
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rtp_relay_ctx.c
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/*
* Copyright (C) 2021 OpenSIPS Solutions
*
* This file is part of opensips, a free SIP server.
*
* opensips 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.
*
* opensips 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.
*/
#include "rtp_relay_ctx.h"
#include "../../mem/shm_mem.h"
#include "../tm/tm_load.h"
#include "../dialog/dlg_load.h"
#include "../../bin_interface.h"
#include "../../lib/cJSON.h"
static struct tm_binds rtp_relay_tmb;
static struct dlg_binds rtp_relay_dlg;
static int rtp_relay_tm_ctx_idx = -1;
static int rtp_relay_dlg_ctx_idx = -1;
static int rtp_relay_ctx_idx = -1;
static rw_lock_t *rtp_relay_contexts_lock;
static struct list_head *rtp_relay_contexts;
#define RTP_RELAY_GET_MSG_CTX() ((struct rtp_relay_ctx *)context_get_ptr(CONTEXT_GLOBAL, \
current_processing_ctx, rtp_relay_ctx_idx))
#define RTP_RELAY_PUT_CTX(_p) context_put_ptr(CONTEXT_GLOBAL, \
current_processing_ctx, rtp_relay_ctx_idx, (_p))
#define RTP_RELAY_GET_TM_CTX(_t) (rtp_relay_tmb.t_ctx_get_ptr(_t, rtp_relay_tm_ctx_idx))
#define RTP_RELAY_PUT_TM_CTX(_t, _p) \
rtp_relay_tmb.t_ctx_put_ptr(_t, rtp_relay_tm_ctx_idx, _p)
#define RTP_RELAY_GET_DLG_CTX(_d) (rtp_relay_dlg.dlg_ctx_get_ptr(_d, rtp_relay_dlg_ctx_idx))
#define RTP_RELAY_PUT_DLG_CTX(_d, _p) \
rtp_relay_dlg.dlg_ctx_put_ptr(_d, rtp_relay_dlg_ctx_idx, _p)
static str rtp_relay_dlg_name = str_init("_rtp_relay_ctx_");
static int rtp_relay_dlg_callbacks(struct dlg_cell *dlg, struct rtp_relay_ctx *ctx);
/* pvar handing */
static struct {
str name;
enum rtp_relay_var_flags flag;
} rtp_relay_var_flags_str[]= {
{ str_init("flags"), RTP_RELAY_FLAGS_SELF },
{ str_init("peer"), RTP_RELAY_FLAGS_PEER },
{ str_init("ip"), RTP_RELAY_FLAGS_IP },
{ str_init("type"), RTP_RELAY_FLAGS_TYPE },
{ str_init("iface"), RTP_RELAY_FLAGS_IFACE },
{ str_init("disabled"), RTP_RELAY_FLAGS_DISABLED },
};
str *rtp_relay_flags_get_str(enum rtp_relay_var_flags flags)
{
static str unknown = str_init("unknown");
int s = sizeof(rtp_relay_var_flags_str) / sizeof (rtp_relay_var_flags_str[0]);
if (flags >= s)
return &unknown;
for (--s; s >=0; s--)
if (rtp_relay_var_flags_str[s].flag == flags)
return &rtp_relay_var_flags_str[s].name;
return &unknown;
}
enum rtp_relay_var_flags rtp_relay_flags_get(const str *name)
{
int s = sizeof(rtp_relay_var_flags_str) / sizeof (rtp_relay_var_flags_str[0]);
for (--s; s >= 0; s--)
if (str_strcasecmp(name, &rtp_relay_var_flags_str[s].name) == 0)
return rtp_relay_var_flags_str[s].flag;
return RTP_RELAY_FLAGS_UNKNOWN;
}
static struct rtp_relay_ctx *rtp_relay_get_dlg_ctx(void)
{
struct dlg_cell *dlg = rtp_relay_dlg.get_dlg();
return dlg?RTP_RELAY_GET_DLG_CTX(dlg):NULL;
}
struct rtp_relay_ctx *rtp_relay_new_ctx(void)
{
struct rtp_relay_ctx *ctx = shm_malloc(sizeof *ctx);
if (!ctx) {
LM_ERR("oom for creating RTP relay context!\n");
return NULL;
}
memset(ctx, 0, sizeof *ctx);
lock_init(&ctx->lock);
INIT_LIST_HEAD(&ctx->sessions);
INIT_LIST_HEAD(&ctx->list);
return ctx;
}
struct rtp_relay_ctx *rtp_relay_get_ctx(void)
{
struct cell* t;
struct rtp_relay_ctx *ctx = rtp_relay_try_get_ctx();
t = rtp_relay_tmb.t_gett();
t = t==T_UNDEFINED ? NULL : t;
if (ctx) {
/* if it is local, and we have transaction, move it in transaction */
if (t && RTP_RELAY_GET_MSG_CTX()) {
RTP_RELAY_PUT_TM_CTX(t, ctx);
RTP_RELAY_PUT_CTX(NULL);
}
return ctx;
}
ctx = rtp_relay_new_ctx();
if (!ctx)
return NULL;
if (t)
RTP_RELAY_PUT_TM_CTX(t, ctx);
else
RTP_RELAY_PUT_CTX(ctx);
return ctx;
}
static void rtp_relay_ctx_free_sess(struct rtp_relay_sess *s)
{
int f;
for (f = 0; f < RTP_RELAY_FLAGS_SIZE; f++) {
if (s->flags[RTP_RELAY_OFFER][f].s)
shm_free(s->flags[RTP_RELAY_OFFER][f].s);
if (s->flags[RTP_RELAY_ANSWER][f].s)
shm_free(s->flags[RTP_RELAY_ANSWER][f].s);
}
if (s->server.node.s)
shm_free(s->server.node.s);
list_del(&s->list);
shm_free(s);
}
void rtp_relay_ctx_free(void *param)
{
struct list_head *it, *safe;
struct rtp_relay_ctx *ctx = (struct rtp_relay_ctx *)param;
if (!ctx)
return;
RTP_RELAY_CTX_LOCK(ctx);
if (rtp_relay_ctx_pending(ctx)) {
rtp_relay_ctx_set_deleted(ctx);
RTP_RELAY_CTX_UNLOCK(ctx);
return;
}
RTP_RELAY_CTX_UNLOCK(ctx);
if (ctx->callid.s)
shm_free(ctx->callid.s);
list_for_each_safe(it, safe, &ctx->sessions)
rtp_relay_ctx_free_sess(list_entry(it, struct rtp_relay_sess, list));
lock_destroy(&ctx->lock);
shm_free(ctx);
}
struct rtp_relay_ctx *rtp_relay_try_get_ctx(void)
{
struct cell* t;
struct rtp_relay_ctx* ctx = NULL;
if ((ctx = rtp_relay_get_dlg_ctx()) != NULL)
return ctx;
if ((ctx = RTP_RELAY_GET_MSG_CTX()) != NULL)
return ctx;
/* local one not found - search in transaction */
t = rtp_relay_tmb.t_gett();
t = t==T_UNDEFINED ? NULL : t;
return (t ? RTP_RELAY_GET_TM_CTX(t) : NULL);
}
static void rtp_relay_move_ctx( struct cell* t, int type, struct tmcb_params *ps)
{
struct rtp_relay_ctx *ctx = rtp_relay_try_get_ctx();
if (!ctx || rtp_relay_get_dlg_ctx())
return; /* nothing to move */
t = rtp_relay_tmb.t_gett();
if (!t || t == T_UNDEFINED) {
LM_DBG("no transaction - can't move the context - freeing!\n");
rtp_relay_ctx_free(ctx);
return;
}
RTP_RELAY_PUT_TM_CTX(t, ctx);
RTP_RELAY_PUT_CTX(NULL);
}
#define RTP_RELAY_CTX_VERSION 1
#define RTP_RELAY_BIN_PUSH(_type, _value) \
do { \
if (bin_push_##_type(&packet, _value) < 0) { \
LM_ERR("cannot push '" #_value "' in bin packet!\n"); \
bin_free_packet(&packet); \
return; \
} \
} while (0)
static void rtp_relay_store_callback(struct dlg_cell *dlg, int type,
struct dlg_cb_params *params)
{
str buffer;
str str_empty = str_init("");
bin_packet_t packet;
enum rtp_relay_type rtype;
enum rtp_relay_var_flags flag;
struct rtp_relay_sess *sess;
str name = str_init("rtp_relay_ctx");
struct rtp_relay_ctx *ctx = RTP_RELAY_GET_DLG_CTX(dlg);
if (!ctx)
return;
if (bin_init(&packet, &name, 0, RTP_RELAY_CTX_VERSION, 0) < 0) {
LM_ERR("cannot initialize bin packet!\n");
return;
}
if (!ctx->main) {
if (list_empty(&ctx->sessions)) {
LM_WARN("no rtp relay session!\n");
return;
}
LM_WARN("rtp relay session not established - storing last session!\n");
sess = list_last_entry(&ctx->sessions, struct rtp_relay_sess, list);
} else {
sess = ctx->main;
}
RTP_RELAY_BIN_PUSH(str, &sess->relay->name);
RTP_RELAY_BIN_PUSH(int, sess->index);
RTP_RELAY_BIN_PUSH(int, sess->state);
RTP_RELAY_BIN_PUSH(int, sess->server.set);
RTP_RELAY_BIN_PUSH(str, &sess->server.node);
for (rtype = RTP_RELAY_OFFER; rtype < RTP_RELAY_SIZE; rtype++) {
for (flag = RTP_RELAY_FLAGS_SELF; flag < RTP_RELAY_FLAGS_SIZE; flag++) {
if (sess->flags[rtype][flag].s)
RTP_RELAY_BIN_PUSH(str, &sess->flags[rtype][flag]);
else
RTP_RELAY_BIN_PUSH(str, &str_empty);
}
}
bin_get_buffer(&packet, &buffer);
bin_free_packet(&packet);
if (rtp_relay_dlg.store_dlg_value(dlg, &rtp_relay_dlg_name, &buffer) < 0)
LM_WARN("rtp relay ctx was not saved in dialog\n");
}
#undef RTP_RELAY_BIN_PUSH
#define RTP_RELAY_BIN_POP(_type, _value) \
do { \
if (bin_pop_##_type(&packet, _value) < 0) { \
LM_ERR("cannot pop '" #_value "' from bin packet!\n"); \
goto error; \
} \
} while (0)
static void rtp_relay_loaded_callback(struct dlg_cell *dlg, int type,
struct dlg_cb_params *params)
{
str tmp;
int index;
str buffer;
bin_packet_t packet;
struct rtp_relay *relay;
enum rtp_relay_type rtype;
enum rtp_relay_var_flags flag;
struct rtp_relay_sess *sess;
struct rtp_relay_ctx *ctx = NULL;
if (!dlg) {
LM_ERR("null dialog - cannot fetch rtp relay info!\n");
return;
}
if (rtp_relay_dlg.fetch_dlg_value(dlg, &rtp_relay_dlg_name, &buffer, 0) < 0) {
LM_DBG("cannot fetch rtp relay info from the dialog\n");
return;
}
bin_init_buffer(&packet, buffer.s, buffer.len);
if (get_bin_pkg_version(&packet) != RTP_RELAY_CTX_VERSION) {
LM_ERR("invalid serialization version (%d != %d)\n",
get_bin_pkg_version(&packet), RTP_RELAY_CTX_VERSION);
return;
}
RTP_RELAY_BIN_POP(str, &tmp);
relay = rtp_relay_get(&tmp);
if (!relay) {
LM_ERR("no registered '%.*s' relay module\n", tmp.len, tmp.s);
return;
}
ctx = rtp_relay_new_ctx();
if (!ctx)
return;
RTP_RELAY_BIN_POP(int, &index);
sess = rtp_relay_new_sess(ctx, index);
if (!sess)
goto error;
RTP_RELAY_BIN_POP(int, &sess->state);
sess->relay = relay;
RTP_RELAY_BIN_POP(int, &sess->server.set);
RTP_RELAY_BIN_POP(str, &tmp);
shm_str_dup(&sess->server.node, &tmp);
for (rtype = RTP_RELAY_OFFER; rtype < RTP_RELAY_SIZE; rtype++) {
for (flag = RTP_RELAY_FLAGS_SELF; flag < RTP_RELAY_FLAGS_SIZE; flag++) {
RTP_RELAY_BIN_POP(str, &tmp);
if (tmp.len && shm_str_dup(&sess->flags[rtype][flag], &tmp) < 0)
LM_ERR("could not duplicate rtp session flag!\n");
}
}
/* all good now - delete the dialog variable as it is useless */
rtp_relay_dlg.store_dlg_value(dlg, &rtp_relay_dlg_name, NULL);
ctx->main = sess;
if (rtp_relay_dlg_callbacks(dlg, ctx) < 0)
goto error;
return;
error:
rtp_relay_ctx_free(ctx);
}
#undef RTP_RELAY_BIN_POP
int rtp_relay_ctx_preinit(void)
{
/* load the TM API */
if (load_tm_api(&rtp_relay_tmb)!=0) {
LM_ERR("TM not loaded - aborting!\n");
return -1;
}
/* load the DLG API */
if (load_dlg_api(&rtp_relay_dlg)!=0) {
LM_ERR("Dialog not loaded - aborting!\n");
return -1;
}
/* we need to register pointer in pre-init, to make sure the new dialogs
* loaded have the context registered */
rtp_relay_dlg_ctx_idx = rtp_relay_dlg.dlg_ctx_register_ptr(rtp_relay_ctx_free);
return 0;
}
int rtp_relay_ctx_init(void)
{
rtp_relay_contexts_lock = lock_init_rw();
if (!rtp_relay_contexts_lock) {
LM_ERR("cannot create lock for RTP Relay sessions\n");
return -1;
}
rtp_relay_contexts = shm_malloc(sizeof *rtp_relay_contexts);
if (!rtp_relay_contexts) {
LM_ERR("cannot create RTP Relay sessions list\n");
return -1;
}
INIT_LIST_HEAD(rtp_relay_contexts);
rtp_relay_tm_ctx_idx = rtp_relay_tmb.t_ctx_register_ptr(rtp_relay_ctx_free);
/* register a routine to move the pointer in tm when the transaction
* is created! */
if (rtp_relay_tmb.register_tmcb(0, 0, TMCB_REQUEST_IN, rtp_relay_move_ctx, 0, 0)<=0) {
LM_ERR("cannot register tm callbacks\n");
return -2;
}
if (rtp_relay_dlg.register_dlgcb(NULL, DLGCB_LOADED,
rtp_relay_loaded_callback, NULL, NULL) < 0)
LM_WARN("cannot register callback for loaded dialogs - will not be "
"able to restore an ongoing media session after a restart!\n");
rtp_relay_ctx_idx = context_register_ptr(CONTEXT_GLOBAL, rtp_relay_ctx_free);
return 0;
}
int rtp_relay_ctx_branch(void)
{
return rtp_relay_tmb.get_branch_index();
}
int rtp_relay_ctx_upstream(void)
{
return rtp_relay_dlg.get_direction() == DLG_DIR_UPSTREAM;
}
struct rtp_relay_sess *rtp_relay_get_sess(struct rtp_relay_ctx *ctx, int index)
{
struct list_head *it;
struct rtp_relay_sess *sess;
if (index == RTP_RELAY_ALL_BRANCHES)
return ctx->main;
list_for_each(it, &ctx->sessions) {
sess = list_entry(it, struct rtp_relay_sess, list);
if (sess->index == index)
return sess;
}
return NULL;
}
static struct rtp_relay_sess *rtp_relay_sess_empty(void)
{
struct rtp_relay_sess *sess;
sess = shm_malloc(sizeof *sess);
if (!sess) {
LM_ERR("oom for new sess!\n");
return NULL;
}
memset(sess, 0, sizeof *sess);
sess->server.set = -1;
sess->index = RTP_RELAY_ALL_BRANCHES;
INIT_LIST_HEAD(&sess->list);
return sess;
}
struct rtp_relay_sess *rtp_relay_new_sess(struct rtp_relay_ctx *ctx, int index)
{
struct rtp_relay_sess *sess = rtp_relay_sess_empty();
if (!sess)
return NULL;
sess->index = index;
if (index == RTP_RELAY_ALL_BRANCHES)
ctx->main = sess;
list_add(&sess->list, &ctx->sessions);
return sess;
}
#define RTP_RELAY_FLAGS(_t, _f) \
(sess->flags[_t][_f].s?&sess->flags[_t][_f]: \
(main?&main->flags[_t][_f]:NULL))
#define RTP_RELAY_PEER(_t) \
(_t == RTP_RELAY_OFFER?RTP_RELAY_ANSWER:RTP_RELAY_OFFER)
static int rtp_relay_offer(struct rtp_relay_session *info,
struct rtp_relay_sess *sess, struct rtp_relay_sess *main,
enum rtp_relay_type type, str *body)
{
if (!sess->relay) {
LM_BUG("no relay found!\n");
return -1;
}
if (sess->relay->binds.offer(info, &sess->server,
RTP_RELAY_FLAGS(RTP_RELAY_PEER(type), RTP_RELAY_FLAGS_IP),
RTP_RELAY_FLAGS(RTP_RELAY_PEER(type), RTP_RELAY_FLAGS_TYPE),
RTP_RELAY_FLAGS(type, RTP_RELAY_FLAGS_IFACE),
RTP_RELAY_FLAGS(RTP_RELAY_PEER(type), RTP_RELAY_FLAGS_IFACE),
RTP_RELAY_FLAGS(type, RTP_RELAY_FLAGS_SELF),
RTP_RELAY_FLAGS(RTP_RELAY_PEER(type), RTP_RELAY_FLAGS_PEER), body) < 0) {
LM_ERR("could not engage offer!\n");
return -1;
}
rtp_sess_set_pending(sess);
return 1;
}
static int rtp_relay_answer(struct rtp_relay_session *info,
struct rtp_relay_sess *sess, struct rtp_relay_sess *main,
enum rtp_relay_type type, str *body)
{
if (!sess->relay) {
LM_BUG("no relay found!\n");
return -1;
}
return sess->relay->binds.answer(info, &sess->server,
RTP_RELAY_FLAGS(type, RTP_RELAY_FLAGS_IP),
RTP_RELAY_FLAGS(RTP_RELAY_PEER(type), RTP_RELAY_FLAGS_TYPE),
RTP_RELAY_FLAGS(RTP_RELAY_PEER(type), RTP_RELAY_FLAGS_IFACE),
RTP_RELAY_FLAGS(type, RTP_RELAY_FLAGS_IFACE),
RTP_RELAY_FLAGS(type, RTP_RELAY_FLAGS_SELF),
RTP_RELAY_FLAGS(type, RTP_RELAY_FLAGS_PEER), body);
}
#undef RTP_RELAY_PEER
static int rtp_relay_delete(struct rtp_relay_session *info,
struct rtp_relay_sess *sess, struct rtp_relay_sess *main)
{
int ret;
if (!sess->relay) {
LM_BUG("no relay found!\n");
return -1;
}
ret = sess->relay->binds.delete(info, &sess->server,
RTP_RELAY_FLAGS(RTP_RELAY_OFFER, RTP_RELAY_FLAGS_SELF),
RTP_RELAY_FLAGS(RTP_RELAY_ANSWER, RTP_RELAY_FLAGS_PEER));
if (ret < 0)
return -1;
rtp_sess_reset_pending(sess);
return 1;
}
#undef RTP_RELAY_FLAGS
static inline void rtp_relay_sess_merge(struct rtp_relay_ctx *ctx, struct rtp_relay_sess *sess)
{
int f;
if (ctx->main == sess)
return;
if (ctx->main) {
for (f = 0; f < RTP_RELAY_FLAGS_SIZE; f++) {
if (!sess->flags[RTP_RELAY_OFFER][f].s) {
sess->flags[RTP_RELAY_OFFER][f] =
ctx->main->flags[RTP_RELAY_OFFER][f];
ctx->main->flags[RTP_RELAY_OFFER][f].s = NULL;
}
if (!sess->flags[RTP_RELAY_ANSWER][f].s) {
sess->flags[RTP_RELAY_ANSWER][f] =
ctx->main->flags[RTP_RELAY_ANSWER][f];
ctx->main->flags[RTP_RELAY_ANSWER][f].s = NULL;
}
}
rtp_relay_ctx_free_sess(ctx->main);
}
ctx->main = sess;
}
static inline int rtp_relay_dlg_mi_flags(rtp_relay_flags flags,
mi_item_t *obj)
{
if (flags[RTP_RELAY_FLAGS_SELF].s &&
add_mi_string(obj, MI_SSTR("flags"),
flags[RTP_RELAY_FLAGS_SELF].s,
flags[RTP_RELAY_FLAGS_SELF].len) < 0)
return -1;
if (flags[RTP_RELAY_FLAGS_PEER].s &&
add_mi_string(obj, MI_SSTR("peer"),
flags[RTP_RELAY_FLAGS_PEER].s,
flags[RTP_RELAY_FLAGS_PEER].len) < 0)
return -1;
if (flags[RTP_RELAY_FLAGS_IP].s &&
add_mi_string(obj, MI_SSTR("IP"),
flags[RTP_RELAY_FLAGS_IP].s,
flags[RTP_RELAY_FLAGS_IP].len) < 0)
return -1;
if (flags[RTP_RELAY_FLAGS_TYPE].s &&
add_mi_string(obj, MI_SSTR("type"),
flags[RTP_RELAY_FLAGS_TYPE].s,
flags[RTP_RELAY_FLAGS_TYPE].len) < 0)
return -1;
if (flags[RTP_RELAY_FLAGS_IFACE].s &&
add_mi_string(obj, MI_SSTR("interface"),
flags[RTP_RELAY_FLAGS_IFACE].s,
flags[RTP_RELAY_FLAGS_IFACE].len) < 0)
return -1;
return 0;
}
static int mi_rtp_relay_ctx(struct rtp_relay_ctx *ctx,
mi_item_t *item, int callid)
{
int ret = -1;
struct rtp_relay_sess *sess;
mi_item_t *rtp_item, *caller_item, *callee_item;
rtp_item = add_mi_object(item, MI_SSTR("rtp_relay"));
if (!rtp_item) {
LM_ERR("cold not create rtp_relay!\n");
return ret;
}
sess = ctx->main;
if (!sess)
goto end;
if (callid && add_mi_string(rtp_item, MI_SSTR("callid"),
ctx->callid.s, ctx->callid.len) < 0)
goto end;
caller_item = add_mi_object(rtp_item, MI_SSTR("caller"));
if (!caller_item)
goto end;
if (rtp_relay_dlg_mi_flags(sess->flags[RTP_RELAY_OFFER], caller_item) < 0)
goto end;
callee_item = add_mi_object(rtp_item, MI_SSTR("callee"));
if (!callee_item)
goto end;
if (rtp_relay_dlg_mi_flags(sess->flags[RTP_RELAY_ANSWER], callee_item) < 0)
goto end;
if (add_mi_string(rtp_item, MI_SSTR("relay"),
sess->relay->name.s, sess->relay->name.len) < 0)
goto end;
if (add_mi_string(rtp_item, MI_SSTR("node"),
sess->server.node.s, sess->server.node.len) < 0)
goto end;
if (add_mi_number(rtp_item, MI_SSTR("set"), sess->server.set) < 0)
goto end;
if (sess->index != RTP_RELAY_ALL_BRANCHES &&
add_mi_number(rtp_item, MI_SSTR("branch"), sess->index) < 0)
goto end;
ret = 0;
end:
return ret;
}
static void rtp_relay_dlg_mi(struct dlg_cell* dlg, int type, struct dlg_cb_params * params)
{
mi_item_t *item = (mi_item_t *)(params->dlg_data);
struct rtp_relay_ctx *ctx = RTP_RELAY_GET_DLG_CTX(dlg);
if (!ctx || !item)
return;
RTP_RELAY_CTX_LOCK(ctx);
mi_rtp_relay_ctx(ctx, item, 0);
RTP_RELAY_CTX_UNLOCK(ctx);
}
static void rtp_relay_delete_dlg(struct dlg_cell *dlg,
struct rtp_relay_ctx *ctx, struct rtp_relay_sess *sess)
{
struct rtp_relay_session info;
memset(&info, 0, sizeof info);
info.callid = &ctx->callid;
info.from_tag = &dlg->legs[DLG_CALLER_LEG].tag;
info.to_tag = &dlg->legs[callee_idx(dlg)].tag;
info.branch = sess->index;
rtp_relay_delete(&info, sess, NULL);
}
static void rtp_relay_dlg_end(struct dlg_cell* dlg, int type, struct dlg_cb_params * params)
{
struct rtp_relay_ctx *ctx = RTP_RELAY_GET_DLG_CTX(dlg);
if (!ctx->main || !rtp_sess_pending(ctx->main))
return;
RTP_RELAY_CTX_LOCK(ctx);
rtp_relay_delete_dlg(dlg, ctx, ctx->main);
RTP_RELAY_CTX_UNLOCK(ctx);
lock_start_write(rtp_relay_contexts_lock);
list_del(&ctx->list);
lock_stop_write(rtp_relay_contexts_lock);
}
void rtp_relay_indlg_tm_req(struct cell* t, int type, struct tmcb_params *p)
{
enum rtp_relay_type rtype;
struct rtp_relay_session info;
struct dlg_cell *dlg = (struct dlg_cell *)(*p->param);
struct rtp_relay_ctx *ctx = RTP_RELAY_GET_DLG_CTX(dlg);
if (!ctx || !ctx->main) {
LM_BUG("could not find a rtp relay context in %p!\n", ctx);
return;
}
memset(&info, 0, sizeof info);
info.branch = ctx->main->index;
info.msg = p->req;
info.body = get_body_part(info.msg, TYPE_APPLICATION, SUBTYPE_SDP);
if (!info.body)
return;
rtype = (rtp_relay_ctx_upstream()?RTP_RELAY_ANSWER:RTP_RELAY_OFFER);
rtp_relay_offer(&info, ctx->main, NULL, rtype, NULL);
}
static void rtp_relay_indlg_tm_rpl(struct sip_msg *msg, struct dlg_cell *dlg, int up)
{
str *body;
enum rtp_relay_type rtype;
struct rtp_relay_session info;
struct rtp_relay_ctx *ctx = RTP_RELAY_GET_DLG_CTX(dlg);
if (!ctx || !ctx->main) {
LM_BUG("could not find a rtp relay context in %p!\n", ctx);
return;
}
body = get_body_part(msg, TYPE_APPLICATION, SUBTYPE_SDP);
if (!body)
return;
memset(&info, 0, sizeof info);
info.branch = ctx->main->index;
info.msg = msg;
info.body = body;
rtype = (up?RTP_RELAY_OFFER:RTP_RELAY_ANSWER);
if (rtp_sess_late(ctx->main))
rtp_relay_offer(&info, ctx->main, NULL, rtype, NULL);
else
rtp_relay_answer(&info, ctx->main, NULL, rtype, NULL);
}
static void rtp_relay_indlg_tm_rpl_up(struct cell* t, int type, struct tmcb_params *p)
{
rtp_relay_indlg_tm_rpl(p->rpl, (struct dlg_cell *)(*p->param), 1);
}
static void rtp_relay_indlg_tm_rpl_down(struct cell* t, int type, struct tmcb_params *p)
{
rtp_relay_indlg_tm_rpl(p->rpl, (struct dlg_cell *)(*p->param), 0);
}
static void rtp_relay_indlg(struct dlg_cell* dlg, int type, struct dlg_cb_params * params)
{
struct rtp_relay_session info;
struct sip_msg *msg = params->msg;
struct rtp_relay_ctx *ctx = RTP_RELAY_GET_DLG_CTX(dlg);
str *body;
int ret;
if (!msg) {
LM_DBG("no message available\n");
return;
}
body = get_body_part(msg, TYPE_APPLICATION, SUBTYPE_SDP);
RTP_RELAY_CTX_LOCK(ctx);
ret = (ctx->main && rtp_sess_pending(ctx->main));
if (ret && !body) {
if (msg->REQ_METHOD != METHOD_INVITE) {
if (msg->REQ_METHOD != METHOD_ACK)
LM_DBG("method %d without SDP\n", msg->REQ_METHOD);
else if (rtp_sess_late(ctx->main))
LM_WARN("late negociation without SDP in ACK!\n");
ret = 0;
} else {
rtp_sess_set_late(ctx->main);
}
}
RTP_RELAY_CTX_UNLOCK(ctx);
if (!ret)
return;
if (msg->REQ_METHOD == METHOD_ACK) {
if (ctx->main || !rtp_sess_late(ctx->main))
return;
memset(&info, 0, sizeof info);
info.msg = msg;
info.body = body;
info.branch = ctx->main->index;
rtp_relay_answer(&info, ctx->main, NULL,
(rtp_relay_ctx_upstream()?RTP_RELAY_ANSWER:RTP_RELAY_OFFER), NULL);
return;
}
if (!body && msg->REQ_METHOD != METHOD_INVITE) {
LM_DBG("%d without body! skipping update\n", msg->REQ_METHOD);
return;
}
rtp_sess_reset_pending(ctx->main);
if (rtp_relay_tmb.register_tmcb(msg, 0, TMCB_REQUEST_FWDED,
rtp_relay_indlg_tm_req, dlg, 0)!=1)
LM_ERR("failed to install TM request callback\n");
if (rtp_relay_ctx_upstream()) {
if (rtp_relay_tmb.register_tmcb(msg, 0, TMCB_RESPONSE_FWDED,
rtp_relay_indlg_tm_rpl_up, dlg, 0)!=1)
LM_ERR("failed to install TM upstream reply callback\n");
} else {
if (rtp_relay_tmb.register_tmcb(msg, 0, TMCB_RESPONSE_FWDED,
rtp_relay_indlg_tm_rpl_down, dlg, 0)!=1)
LM_ERR("failed to install TM downstream reply callback\n");
}
}
static int rtp_relay_dlg_callbacks(struct dlg_cell *dlg, struct rtp_relay_ctx *ctx)
{
if (shm_str_sync(&ctx->callid, &dlg->callid) < 0)
LM_ERR("could not store callid in dialog\n");
if (rtp_relay_dlg.register_dlgcb(dlg, DLGCB_MI_CONTEXT,
rtp_relay_dlg_mi, NULL, NULL) < 0)
LM_ERR("could not register MI dlg print!\n");
RTP_RELAY_PUT_DLG_CTX(dlg, ctx);
if (rtp_relay_dlg.register_dlgcb(dlg,
DLGCB_TERMINATED|DLGCB_EXPIRED,
rtp_relay_dlg_end, NULL, NULL) < 0) {
LM_ERR("could not register MI dlg end!\n");
goto error;
}
if (rtp_relay_dlg.register_dlgcb(dlg,
DLGCB_REQ_WITHIN,
rtp_relay_indlg, NULL, NULL) != 0) {
LM_ERR("could not register request within dlg callback!\n");
goto error;
}
if (rtp_relay_dlg.register_dlgcb(dlg, DLGCB_WRITE_VP,
rtp_relay_store_callback, NULL, NULL))
LM_WARN("cannot register callback for rtp relay serialization! "
"Will not be able to engage rtp relay in case of a restart!\n");
lock_start_write(rtp_relay_contexts_lock);
list_add(&ctx->list, rtp_relay_contexts);
lock_stop_write(rtp_relay_contexts_lock);
return 0;
error:
RTP_RELAY_PUT_DLG_CTX(dlg, NULL);
return -1;
}
static int rtp_relay_sess_last(struct rtp_relay_ctx *ctx,
struct rtp_relay_sess *sess)
{
struct list_head *it;
struct rtp_relay_sess *s;
int n = 0;
list_for_each(it, &ctx->sessions) {
s = list_entry(it, struct rtp_relay_sess, list);
if (s->index == RTP_RELAY_ALL_BRANCHES)
continue;
if (sess && sess->index == s->index)
continue;
n++;
}
return n == 0;
}
static int rtp_relay_sess_success(struct rtp_relay_ctx *ctx,
struct rtp_relay_sess *sess, struct cell *t)
{
struct dlg_cell *dlg;
rtp_sess_set_success(sess);
if (rtp_relay_sess_last(ctx, sess))
rtp_relay_sess_merge(ctx, sess);
if (!rtp_relay_ctx_established(ctx)) {
dlg = rtp_relay_dlg.get_dlg();
if (!dlg) {
LM_ERR("could not find dialog!\n");
return -1;
}
/* reset old pointers */
RTP_RELAY_PUT_TM_CTX(t, NULL);
RTP_RELAY_PUT_CTX(NULL);
if (rtp_relay_dlg_callbacks(dlg, ctx) < 0) {
RTP_RELAY_PUT_TM_CTX(t, ctx);
return -1;
}
rtp_relay_ctx_set_established(ctx);
}
return 0;
}
static void rtp_relay_sess_failed(struct rtp_relay_ctx *ctx,
struct rtp_relay_sess *sess)
{
struct rtp_relay_sess *last;
rtp_sess_reset_pending(sess);
list_del(&sess->list);
if (rtp_relay_sess_last(ctx, NULL)) {
last = list_last_entry(&ctx->sessions, struct rtp_relay_sess, list);
if (rtp_sess_success(last))
rtp_relay_sess_merge(ctx, last);
}
}
static int handle_rtp_relay_ctx_leg_reply(struct rtp_relay_ctx *ctx, struct sip_msg *msg,
struct cell *t, struct rtp_relay_sess *sess)
{
int ret;
struct rtp_relay_session info;
memset(&info, 0, sizeof info);
info.msg = msg;
if (msg->REPLY_STATUS >= 300) {
if (!rtp_sess_late(sess)) {
rtp_relay_delete(&info, sess, ctx->main);
} else {
/* nothing to do */
LM_DBG("negative reply on late branch\n");
}
rtp_relay_sess_failed(ctx, sess);
return 1;
}
info.body = get_body_part(msg, TYPE_APPLICATION, SUBTYPE_SDP);
if (!info.body) {
if (msg->REPLY_STATUS < 200) {
LM_DBG("provisioning reply %d without body\n", msg->REPLY_STATUS);
return 1;
} else if (rtp_sess_late(sess)) {
LM_WARN("no SDP in final reply of late negotiation\n");
return -1;
} else {
LM_WARN("final reply without SDP - cannot complete negotiation!\n");
return -1;
}
}
info.branch = sess->index;
if (rtp_sess_late(sess))
ret = rtp_relay_offer(&info, sess, ctx->main, RTP_RELAY_ANSWER, NULL);
else
ret = rtp_relay_answer(&info, sess, ctx->main, RTP_RELAY_ANSWER, NULL);
if (ret > 0 && msg->REPLY_STATUS >= 200)
rtp_relay_sess_success(ctx, sess, t);
return ret;
}
static void rtp_relay_ctx_initial_cb(struct cell* t, int type, struct tmcb_params *p)
{
struct rtp_relay_session info;
struct rtp_relay_sess *sess;
struct rtp_relay_ctx *ctx = *(struct rtp_relay_ctx **)(p->param);
RTP_RELAY_CTX_LOCK(ctx);
switch (type) {
case TMCB_RESPONSE_FWDED:
/* first check if there's anything setup on this branch */
sess = rtp_relay_get_sess(ctx, rtp_relay_ctx_branch());
if (sess) {
if (!rtp_sess_pending(sess)) {
LM_DBG("no pending session on branch %d\n",
rtp_relay_ctx_branch());
sess = ctx->main;
}
} else {
LM_DBG("no session on branch %d\n", rtp_relay_ctx_branch());
sess = ctx->main;
}
if (!sess) {
LM_DBG("no session to respond to\n");
goto end;
}
if (rtp_sess_disabled(sess) || (!rtp_sess_late(sess) && !rtp_sess_pending(sess))) {
LM_DBG("disabled and/or pending session %d/%d\n",
rtp_sess_disabled(sess), rtp_sess_pending(sess));
goto end;
}
handle_rtp_relay_ctx_leg_reply(ctx, p->rpl, t, sess);
break;
case TMCB_REQUEST_FWDED:
if (ctx->main && (rtp_sess_pending(ctx->main) || rtp_sess_late(ctx->main))) {
LM_DBG("RTP relay already engaged in main branch\n");
goto end;
}
sess = rtp_relay_get_sess(ctx, rtp_relay_ctx_branch());
if (!sess) /* not engagned on this branch */ {
LM_DBG("RTP relay not engaged on branch %d!\n", rtp_relay_ctx_branch());
goto end;
}
if (rtp_sess_disabled(sess)) {
LM_DBG("rtp relay on branch %d is disabled\n", rtp_relay_ctx_branch());
goto end;
}
if (rtp_sess_late(sess)) {
LM_DBG("rtp relay on branch %d is late\n", rtp_relay_ctx_branch());
goto end;
}
memset(&info, 0, sizeof info);
info.body = get_body_part(p->req, TYPE_APPLICATION, SUBTYPE_SDP);
info.msg = p->req;
info.branch = sess->index;
if (ctx->main && sess != ctx->main) {
/* inherit props from ctx->main */
if (sess->server.set == -1)
sess->server.set = ctx->main->server.set;
if (!sess->relay)
sess->relay = ctx->main->relay;
}
rtp_relay_offer(&info, sess, ctx->main, RTP_RELAY_OFFER, NULL);
break;
default:
LM_BUG("unhandled callback type %d\n", type);
break;
}
end:
RTP_RELAY_CTX_UNLOCK(ctx);
}
int rtp_relay_ctx_engage(struct sip_msg *msg,
struct rtp_relay_ctx *ctx, struct rtp_relay *relay, int *set)
{
int index;
struct rtp_relay_sess *sess;
struct rtp_relay_session info;
if (!rtp_relay_ctx_engaged(ctx)) {
/* handles the replies to the original INVITE */
if (rtp_relay_tmb.register_tmcb(msg, 0,
TMCB_RESPONSE_FWDED|TMCB_REQUEST_FWDED,
rtp_relay_ctx_initial_cb, ctx, 0)!=1) {
LM_ERR("failed to install TM reply callback\n");