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pjproject/pjmedia/src/pjmedia/transport_srtp.c

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/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pjmedia/transport_srtp.h>
#include <pjmedia/endpoint.h>
#include <pjmedia/rtp.h>
#include <pjlib-util/base64.h>
#include <pj/array.h>
#include <pj/assert.h>
#include <pj/ctype.h>
#include <pj/lock.h>
#include <pj/log.h>
#include <pj/os.h>
#include <pj/pool.h>
#if defined(PJMEDIA_HAS_SRTP) && (PJMEDIA_HAS_SRTP != 0)
/* Enable this to test ROC initialization setting. For offerer,
* it will send packets with ROC 1 and expect to receive ROC 2.
* For answerer it will be the other way around.
*/
#define TEST_ROC 0
#if defined(PJ_HAS_SSL_SOCK) && PJ_HAS_SSL_SOCK != 0 && \
(PJ_SSL_SOCK_IMP == PJ_SSL_SOCK_IMP_OPENSSL)
# include <openssl/rand.h>
# include <openssl/opensslv.h>
/* Suppress compile warning of OpenSSL deprecation (OpenSSL is deprecated
* since MacOSX 10.7).
*/
#if defined(PJ_DARWINOS) && PJ_DARWINOS==1
# pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
#endif
#if defined(PJMEDIA_EXTERNAL_SRTP)
#if (PJMEDIA_EXTERNAL_SRTP == 1) /* External SRTP 1.x */
# include <srtp/srtp.h>
# include <srtp/crypto_kernel.h>
#define srtp_crypto_policy_t crypto_policy_t
#define srtp_cipher_type_id_t cipher_type_id_t
#define srtp_cipher_type_t cipher_type_t
#define srtp_auth_type_id_t auth_type_id_t
#define srtp_sec_serv_t sec_serv_t
#define srtp_err_status_t err_status_t
#define srtp_err_status_ok err_status_ok
#define srtp_err_status_replay_old err_status_replay_old
#define srtp_err_status_replay_fail err_status_replay_fail
#define srtp_crypto_policy_set_aes_cm_256_hmac_sha1_32 \
crypto_policy_set_aes_cm_256_hmac_sha1_32
#define srtp_crypto_policy_set_aes_cm_256_hmac_sha1_80 \
crypto_policy_set_aes_cm_256_hmac_sha1_80
#define SRTP_NULL_CIPHER NULL_CIPHER
#define SRTP_NULL_AUTH NULL_AUTH
#define SRTP_AES_ICM_128 AES_ICM
#define SRTP_AES_ICM_192 AES_ICM
#define SRTP_AES_ICM_256 AES_ICM
#define SRTP_AES_GCM_128 AES_128_GCM
#define SRTP_AES_GCM_256 AES_256_GCM
#define SRTP_HMAC_SHA1 HMAC_SHA1
#define srtp_aes_gcm_256_openssl aes_gcm_256_openssl
#define srtp_aes_gcm_128_openssl aes_gcm_128_openssl
#else /* External SRTP 2.x */
# include <srtp2/srtp.h>
# include <srtp2/cipher.h>
/* In libsrtp 2.0.0, the macro SRTP_AES_ICM_128 is not available.
* Instead it was named with ICM at the end: SRTP_AES_128_ICM.
*/
# ifdef SRTP_AES_128_ICM
# define SRTP_AES_ICM_128 SRTP_AES_128_ICM
# define SRTP_AES_ICM_192 SRTP_AES_192_ICM
# define SRTP_AES_ICM_256 SRTP_AES_256_ICM
# define SRTP_AES_GCM_128 SRTP_AES_128_GCM
# define SRTP_AES_GCM_256 SRTP_AES_256_GCM
# endif
#endif
#else /* Bundled SRTP */
# include <srtp.h>
# include <crypto_kernel.h>
#endif
#define THIS_FILE "transport_srtp.c"
/* Maximum size of outgoing packet */
#define MAX_RTP_BUFFER_LEN PJMEDIA_MAX_MTU
#define MAX_RTCP_BUFFER_LEN PJMEDIA_MAX_MTU
/* Maximum SRTP crypto key length */
#define MAX_KEY_LEN 128
/* Initial value of probation counter. When probation counter > 0,
* it means SRTP is in probation state, and it may restart when
* srtp_unprotect() returns err_status_replay_*
*/
#define PROBATION_CNT_INIT 100
#define DEACTIVATE_MEDIA(pool, m) pjmedia_sdp_media_deactivate(pool, m)
#ifdef SRTP_MAX_TRAILER_LEN
# define MAX_TRAILER_LEN SRTP_MAX_TRAILER_LEN
#else
# define MAX_TRAILER_LEN 10
#endif
/* Maximum number of SRTP keying method */
#define MAX_KEYING 2
static const pj_str_t ID_RTP_AVP = { "RTP/AVP", 7 };
static const pj_str_t ID_RTP_SAVP = { "RTP/SAVP", 8 };
// static const pj_str_t ID_INACTIVE = { "inactive", 8 };
static const pj_str_t ID_CRYPTO = { "crypto", 6 };
typedef void (*crypto_method_t)(srtp_crypto_policy_t *policy);
typedef struct crypto_suite
{
char *name;
srtp_cipher_type_id_t cipher_type;
unsigned cipher_key_len; /* key + salt length */
unsigned cipher_salt_len; /* salt only length */
srtp_auth_type_id_t auth_type;
unsigned auth_key_len;
unsigned srtp_auth_tag_len;
unsigned srtcp_auth_tag_len;
srtp_sec_serv_t service;
/* This is an attempt to validate crypto support by libsrtp, i.e: it should
* raise linking error if the libsrtp does not support the crypto.
*/
srtp_cipher_type_t *ext_cipher_type;
crypto_method_t ext_crypto_method;
} crypto_suite;
extern srtp_cipher_type_t srtp_aes_gcm_256_openssl;
extern srtp_cipher_type_t srtp_aes_gcm_128_openssl;
extern srtp_cipher_type_t srtp_aes_icm_192;
/* https://www.iana.org/assignments/sdp-security-descriptions/sdp-security-descriptions.xhtml */
static crypto_suite crypto_suites[] = {
/* plain RTP/RTCP (no cipher & no auth) */
{"NULL", SRTP_NULL_CIPHER, 0, SRTP_NULL_AUTH, 0, 0, 0, sec_serv_none},
#if defined(PJMEDIA_SRTP_HAS_AES_GCM_256)&&(PJMEDIA_SRTP_HAS_AES_GCM_256!=0)
/* cipher AES_GCM, NULL auth, auth tag len = 16 octets */
{"AEAD_AES_256_GCM", SRTP_AES_GCM_256, 44, 12,
SRTP_NULL_AUTH, 0, 16, 16, sec_serv_conf_and_auth,
&srtp_aes_gcm_256_openssl},
/* cipher AES_GCM, NULL auth, auth tag len = 8 octets */
{"AEAD_AES_256_GCM_8", SRTP_AES_GCM_256, 44, 12,
SRTP_NULL_AUTH, 0, 8, 8, sec_serv_conf_and_auth,
&srtp_aes_gcm_256_openssl},
#endif
#if defined(PJMEDIA_SRTP_HAS_AES_CM_256)&&(PJMEDIA_SRTP_HAS_AES_CM_256!=0)
/* cipher AES_CM_256, auth SRTP_HMAC_SHA1, auth tag len = 10 octets */
{"AES_256_CM_HMAC_SHA1_80", SRTP_AES_ICM_256, 46, 14,
SRTP_HMAC_SHA1, 20, 10, 10, sec_serv_conf_and_auth,
NULL, &srtp_crypto_policy_set_aes_cm_256_hmac_sha1_80},
/* cipher AES_CM_256, auth SRTP_HMAC_SHA1, auth tag len = 10 octets */
{"AES_256_CM_HMAC_SHA1_32", SRTP_AES_ICM_256, 46, 14,
SRTP_HMAC_SHA1, 20, 4, 10, sec_serv_conf_and_auth,
NULL, &srtp_crypto_policy_set_aes_cm_256_hmac_sha1_32},
#endif
#if defined(PJMEDIA_SRTP_HAS_AES_CM_192)&&(PJMEDIA_SRTP_HAS_AES_CM_192!=0)
/* cipher AES_CM_192, auth SRTP_HMAC_SHA1, auth tag len = 10 octets */
{"AES_192_CM_HMAC_SHA1_80", SRTP_AES_ICM_192, 38, 14,
SRTP_HMAC_SHA1, 20, 10, 10, sec_serv_conf_and_auth,
&srtp_aes_icm_192},
/* cipher AES_CM_192, auth SRTP_HMAC_SHA1, auth tag len = 4 octets */
{"AES_192_CM_HMAC_SHA1_32", SRTP_AES_ICM_192, 38, 14,
SRTP_HMAC_SHA1, 20, 4, 10, sec_serv_conf_and_auth,
&srtp_aes_icm_192},
#endif
#if defined(PJMEDIA_SRTP_HAS_AES_GCM_128)&&(PJMEDIA_SRTP_HAS_AES_GCM_128!=0)
/* cipher AES_GCM, NULL auth, auth tag len = 16 octets */
{"AEAD_AES_128_GCM", SRTP_AES_GCM_128, 28, 12,
SRTP_NULL_AUTH, 0, 16, 16, sec_serv_conf_and_auth,
&srtp_aes_gcm_128_openssl},
/* cipher AES_GCM, NULL auth, auth tag len = 8 octets */
{"AEAD_AES_128_GCM_8", SRTP_AES_GCM_128, 28, 12,
SRTP_NULL_AUTH, 0, 8, 8, sec_serv_conf_and_auth,
&srtp_aes_gcm_128_openssl},
#endif
#if defined(PJMEDIA_SRTP_HAS_AES_CM_128)&&(PJMEDIA_SRTP_HAS_AES_CM_128!=0)
/* cipher AES_CM_128, auth SRTP_HMAC_SHA1, auth tag len = 10 octets */
{"AES_CM_128_HMAC_SHA1_80", SRTP_AES_ICM_128, 30, 14,
SRTP_HMAC_SHA1, 20, 10, 10, sec_serv_conf_and_auth},
/* cipher AES_CM_128, auth SRTP_HMAC_SHA1, auth tag len = 4 octets */
{"AES_CM_128_HMAC_SHA1_32", SRTP_AES_ICM_128, 30, 14,
SRTP_HMAC_SHA1, 20, 4, 10, sec_serv_conf_and_auth},
#endif
/*
* F8_128_HMAC_SHA1_8 not supported by libsrtp?
* {"F8_128_HMAC_SHA1_8", NULL_CIPHER, 0, 0, NULL_AUTH, 0, 0, 0,
* sec_serv_none}
*/
};
/* SRTP transport */
typedef struct transport_srtp
{
pjmedia_transport base; /**< Base transport interface. */
pj_pool_t *pool; /**< Pool for transport SRTP. */
pj_lock_t *mutex; /**< Mutex for libsrtp contexts.*/
char rtp_tx_buffer[MAX_RTP_BUFFER_LEN];
char rtcp_tx_buffer[MAX_RTCP_BUFFER_LEN];
pjmedia_srtp_setting setting;
unsigned media_option;
pj_bool_t use_rtcp_mux; /**< Use RTP& RTCP multiplexing?*/
/* SRTP policy */
pj_bool_t session_inited;
pj_bool_t offerer_side;
pj_bool_t bypass_srtp;
char tx_key[MAX_KEY_LEN];
char rx_key[MAX_KEY_LEN];
pjmedia_srtp_crypto tx_policy;
pjmedia_srtp_crypto rx_policy;
/* Temporary policy for negotiation */
pjmedia_srtp_crypto tx_policy_neg;
pjmedia_srtp_crypto rx_policy_neg;
/* libSRTP contexts */
srtp_t srtp_tx_ctx;
srtp_t srtp_rx_ctx;
/* Stream information */
void *user_data;
void (*rtp_cb)( void *user_data,
void *pkt,
pj_ssize_t size);
void (*rtp_cb2)(pjmedia_tp_cb_param*);
void (*rtcp_cb)(void *user_data,
void *pkt,
pj_ssize_t size);
/* Transport information */
pjmedia_transport *member_tp; /**< Underlying transport. */
pj_bool_t member_tp_attached;
pj_bool_t started;
/* SRTP usage policy of peer. This field is updated when media is starting.
* This is useful when SRTP is in optional mode and peer is using mandatory
* mode, so when local is about to reinvite/update, it should offer
* RTP/SAVP instead of offering RTP/AVP.
*/
pjmedia_srtp_use peer_use;
/* When probation counter > 0, it means SRTP is in probation state,
* and it may restart when srtp_unprotect() returns err_status_replay_*
*/
unsigned probation_cnt;
/* SRTP keying methods. The keying is implemented using media transport
* abstraction, so it will also be invoked when the SRTP media transport
* operation is invoked.
*
* As there can be multiple keying methods enabled (currently only SDES &
* DTLS-SRTP), each keying method will be given the chance to respond to
* remote SDP. If any keying operation returns non-success, it will be
* removed from the session. And once SRTP key is obtained via a keying
* method, any other keying methods will be stopped and destroyed.
*/
unsigned all_keying_cnt;
pjmedia_transport *all_keying[MAX_KEYING];
/* Current active SRTP keying methods. */
unsigned keying_cnt;
pjmedia_transport *keying[MAX_KEYING];
/* If not zero, keying nego is ongoing (async-ly, e.g: by DTLS-SRTP).
* This field may be updated by keying method.
*/
unsigned keying_pending_cnt;
/* RTP SSRC in receiving direction, used in getting and setting SRTP
* roll over counter (ROC) on SRTP restart.
*/
pj_uint32_t rx_ssrc;
pj_uint32_t tx_ssrc;
} transport_srtp;
/*
* This callback is called by transport when incoming rtp is received
*/
static void srtp_rtp_cb(pjmedia_tp_cb_param *param);
/*
* This callback is called by transport when incoming rtcp is received
*/
static void srtp_rtcp_cb( void *user_data, void *pkt, pj_ssize_t size);
/*
* These are media transport operations.
*/
static pj_status_t transport_get_info (pjmedia_transport *tp,
pjmedia_transport_info *info);
//static pj_status_t transport_attach (pjmedia_transport *tp,
// void *user_data,
// const pj_sockaddr_t *rem_addr,
// const pj_sockaddr_t *rem_rtcp,
// unsigned addr_len,
// void (*rtp_cb)(void*,
// void*,
// pj_ssize_t),
// void (*rtcp_cb)(void*,
// void*,
// pj_ssize_t));
static void transport_detach (pjmedia_transport *tp,
void *strm);
static pj_status_t transport_send_rtp( pjmedia_transport *tp,
const void *pkt,
pj_size_t size);
static pj_status_t transport_send_rtcp(pjmedia_transport *tp,
const void *pkt,
pj_size_t size);
static pj_status_t transport_send_rtcp2(pjmedia_transport *tp,
const pj_sockaddr_t *addr,
unsigned addr_len,
const void *pkt,
pj_size_t size);
static pj_status_t transport_media_create(pjmedia_transport *tp,
pj_pool_t *sdp_pool,
unsigned options,
const pjmedia_sdp_session *sdp_remote,
unsigned media_index);
static pj_status_t transport_encode_sdp(pjmedia_transport *tp,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *sdp_remote,
unsigned media_index);
static pj_status_t transport_media_start (pjmedia_transport *tp,
pj_pool_t *pool,
const pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *sdp_remote,
unsigned media_index);
static pj_status_t transport_media_stop(pjmedia_transport *tp);
static pj_status_t transport_simulate_lost(pjmedia_transport *tp,
pjmedia_dir dir,
unsigned pct_lost);
static pj_status_t transport_destroy (pjmedia_transport *tp);
static pj_status_t transport_attach2 (pjmedia_transport *tp,
pjmedia_transport_attach_param *param);
static pjmedia_transport_op transport_srtp_op =
{
&transport_get_info,
NULL, //&transport_attach,
&transport_detach,
&transport_send_rtp,
&transport_send_rtcp,
&transport_send_rtcp2,
&transport_media_create,
&transport_encode_sdp,
&transport_media_start,
&transport_media_stop,
&transport_simulate_lost,
&transport_destroy,
&transport_attach2
};
/* Get crypto index from crypto name */
static int get_crypto_idx(const pj_str_t* crypto_name);
/* Is crypto empty (i.e: no name or key)? */
static pj_bool_t srtp_crypto_empty(const pjmedia_srtp_crypto* c);
/* Compare crypto, return zero if same */
static int srtp_crypto_cmp(const pjmedia_srtp_crypto* c1,
const pjmedia_srtp_crypto* c2);
/* Start SRTP */
static pj_status_t start_srtp(transport_srtp *srtp);
/* This function may also be used by other module, e.g: pjmedia/errno.c,
* it should have C compatible declaration.
*/
PJ_BEGIN_DECL
const char* get_libsrtp_errstr(int err);
PJ_END_DECL
const char* get_libsrtp_errstr(int err)
{
#if defined(PJ_HAS_ERROR_STRING) && (PJ_HAS_ERROR_STRING != 0)
static char *liberr[] = {
"ok", /* srtp_err_status_ok = 0 */
"unspecified failure", /* err_status_fail = 1 */
"unsupported parameter", /* err_status_bad_param = 2 */
"couldn't allocate memory", /* err_status_alloc_fail = 3 */
"couldn't deallocate properly", /* err_status_dealloc_fail = 4 */
"couldn't initialize", /* err_status_init_fail = 5 */
"can't process as much data as requested",
/* err_status_terminus = 6 */
"authentication failure", /* err_status_auth_fail = 7 */
"cipher failure", /* err_status_cipher_fail = 8 */
"replay check failed (bad index)", /* err_status_replay_fail = 9 */
"replay check failed (index too old)",
/* err_status_replay_old = 10 */
"algorithm failed test routine", /* err_status_algo_fail = 11 */
"unsupported operation", /* err_status_no_such_op = 12 */
"no appropriate context found", /* err_status_no_ctx = 13 */
"unable to perform desired validation",
/* err_status_cant_check = 14 */
"can't use key any more", /* err_status_key_expired = 15 */
"error in use of socket", /* err_status_socket_err = 16 */
"error in use POSIX signals", /* err_status_signal_err = 17 */
"nonce check failed", /* err_status_nonce_bad = 18 */
"couldn't read data", /* err_status_read_fail = 19 */
"couldn't write data", /* err_status_write_fail = 20 */
"error pasring data", /* err_status_parse_err = 21 */
"error encoding data", /* err_status_encode_err = 22 */
"error while using semaphores", /* err_status_semaphore_err = 23 */
"error while using pfkey" /* err_status_pfkey_err = 24 */
};
if (err >= 0 && err < (int)PJ_ARRAY_SIZE(liberr)) {
return liberr[err];
} else {
static char msg[32];
pj_ansi_snprintf(msg, sizeof(msg), "Unknown libsrtp error %d", err);
return msg;
}
#else
static char msg[32];
pj_ansi_snprintf(msg, sizeof(msg), "libsrtp error %d", err);
return msg;
#endif
}
/* SRTP keying method: Session Description */
#if defined(PJMEDIA_SRTP_HAS_SDES) && (PJMEDIA_SRTP_HAS_SDES != 0)
# include "transport_srtp_sdes.c"
#endif
/* SRTP keying method: DTLS */
#if defined(PJMEDIA_SRTP_HAS_DTLS) && (PJMEDIA_SRTP_HAS_DTLS != 0)
# include "transport_srtp_dtls.c"
#else
PJ_DEF(pj_status_t) pjmedia_transport_srtp_dtls_start_nego(
pjmedia_transport *srtp,
const pjmedia_srtp_dtls_nego_param *param)
{
PJ_UNUSED_ARG(srtp);
PJ_UNUSED_ARG(param);
return PJ_ENOTSUP;
}
PJ_DEF(pj_status_t) pjmedia_transport_srtp_dtls_get_fingerprint(
pjmedia_transport *srtp,
const char *hash,
char *buf, pj_size_t *len)
{
PJ_UNUSED_ARG(srtp);
PJ_UNUSED_ARG(hash);
PJ_UNUSED_ARG(buf);
PJ_UNUSED_ARG(len);
return PJ_ENOTSUP;
}
#endif
static pj_bool_t libsrtp_initialized;
static void pjmedia_srtp_deinit_lib(pjmedia_endpt *endpt);
PJ_DEF(pj_status_t) pjmedia_srtp_init_lib(pjmedia_endpt *endpt)
{
pj_status_t status = PJ_SUCCESS;
if (libsrtp_initialized)
return PJ_SUCCESS;
#if PJMEDIA_LIBSRTP_AUTO_INIT_DEINIT
/* Init libsrtp */
{
srtp_err_status_t err;
err = srtp_init();
if (err != srtp_err_status_ok) {
PJ_LOG(4, (THIS_FILE, "Failed to initialize libsrtp: %s",
get_libsrtp_errstr(err)));
return PJMEDIA_ERRNO_FROM_LIBSRTP(err);
}
}
#endif
#if defined(PJMEDIA_SRTP_HAS_DTLS) && (PJMEDIA_SRTP_HAS_DTLS != 0)
dtls_init();
#endif
status = pjmedia_endpt_atexit(endpt, pjmedia_srtp_deinit_lib);
if (status != PJ_SUCCESS) {
/* There will be memory leak when it fails to schedule libsrtp
* deinitialization, however the memory leak could be harmless,
* since in modern OS's memory used by an application is released
* when the application terminates.
*/
PJ_PERROR(4, (THIS_FILE, status,
"Failed to register libsrtp deinit."));
/* Ignore this error */
status = PJ_SUCCESS;
}
libsrtp_initialized = PJ_TRUE;
return status;
}
static void pjmedia_srtp_deinit_lib(pjmedia_endpt *endpt)
{
srtp_err_status_t err;
/* Note that currently this SRTP init/deinit is not equipped with
* reference counter, it should be safe as normally there is only
* one single instance of media endpoint and even if it isn't, the
* pjmedia_transport_srtp_create() will invoke SRTP init (the only
* drawback should be the delay described by #788).
*/
PJ_UNUSED_ARG(endpt);
#if !defined(PJMEDIA_SRTP_HAS_DEINIT) && !defined(PJMEDIA_SRTP_HAS_SHUTDOWN)
# define PJMEDIA_SRTP_HAS_SHUTDOWN 1
#endif
#if PJMEDIA_LIBSRTP_AUTO_INIT_DEINIT
# if defined(PJMEDIA_SRTP_HAS_DEINIT) && PJMEDIA_SRTP_HAS_DEINIT!=0
err = srtp_deinit();
# elif defined(PJMEDIA_SRTP_HAS_SHUTDOWN) && PJMEDIA_SRTP_HAS_SHUTDOWN!=0
err = srtp_shutdown();
# else
err = srtp_err_status_ok;
# endif
if (err != srtp_err_status_ok) {
PJ_LOG(4, (THIS_FILE, "Failed to deinitialize libsrtp: %s",
get_libsrtp_errstr(err)));
}
#endif // PJMEDIA_LIBSRTP_AUTO_INIT_DEINIT
#if defined(PJMEDIA_SRTP_HAS_DTLS) && (PJMEDIA_SRTP_HAS_DTLS != 0)
dtls_deinit();
#endif
libsrtp_initialized = PJ_FALSE;
}
static int get_crypto_idx(const pj_str_t* crypto_name)
{
int i;
int cs_cnt = PJ_ARRAY_SIZE(crypto_suites);
/* treat unspecified crypto_name as crypto 'NULL' */
if (crypto_name->slen == 0)
return 0;
for (i=0; i<cs_cnt; ++i) {
if (!pj_stricmp2(crypto_name, crypto_suites[i].name))
return i;
}
return -1;
}
static int srtp_crypto_cmp(const pjmedia_srtp_crypto* c1,
const pjmedia_srtp_crypto* c2)
{
int r;
r = pj_strcmp(&c1->key, &c2->key);
if (r != 0)
return r;
r = pj_stricmp(&c1->name, &c2->name);
if (r != 0)
return r;
return (c1->flags != c2->flags);
}
static pj_bool_t srtp_crypto_empty(const pjmedia_srtp_crypto* c)
{
return (c->name.slen==0 || c->key.slen==0);
}
PJ_DEF(void) pjmedia_srtp_setting_default(pjmedia_srtp_setting *opt)
{
pj_assert(opt);
pj_bzero(opt, sizeof(pjmedia_srtp_setting));
opt->close_member_tp = PJ_TRUE;
opt->use = PJMEDIA_SRTP_OPTIONAL;
}
/*
* Enumerate all SRTP cryptos, except "NULL".
*/
PJ_DEF(pj_status_t) pjmedia_srtp_enum_crypto(unsigned *count,
pjmedia_srtp_crypto crypto[])
{
unsigned i, max;
PJ_ASSERT_RETURN(count && crypto, PJ_EINVAL);
max = PJ_ARRAY_SIZE(crypto_suites) - 1;
if (*count > max)
*count = max;
for (i=0; i<*count; ++i) {
pj_bzero(&crypto[i], sizeof(crypto[0]));
crypto[i].name = pj_str(crypto_suites[i+1].name);
}
return PJ_SUCCESS;
}
/*
* Enumerate available SRTP keying methods.
*/
PJ_DEF(pj_status_t) pjmedia_srtp_enum_keying(unsigned *count,
pjmedia_srtp_keying_method keying[])
{
unsigned max;
PJ_ASSERT_RETURN(count && keying, PJ_EINVAL);
max = *count;
*count = 0;
#if defined(PJMEDIA_SRTP_HAS_SDES) && (PJMEDIA_SRTP_HAS_SDES != 0)
if (*count < max)
keying[(*count)++] = PJMEDIA_SRTP_KEYING_SDES;
#endif
#if defined(PJMEDIA_SRTP_HAS_DTLS) && (PJMEDIA_SRTP_HAS_DTLS != 0)
if (*count < max)
keying[(*count)++] = PJMEDIA_SRTP_KEYING_DTLS_SRTP;
#endif
return PJ_SUCCESS;
}
/*
* Create an SRTP media transport.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_create(
pjmedia_endpt *endpt,
pjmedia_transport *tp,
const pjmedia_srtp_setting *opt,
pjmedia_transport **p_tp)
{
pj_pool_t *pool;
transport_srtp *srtp;
pj_status_t status;
unsigned i;
PJ_ASSERT_RETURN(endpt && tp && p_tp, PJ_EINVAL);
/* Check crypto */
if (opt && opt->use != PJMEDIA_SRTP_DISABLED) {
for (i=0; i < opt->crypto_count; ++i) {
int cs_idx = get_crypto_idx(&opt->crypto[i].name);
/* check crypto name */
if (cs_idx == -1)
return PJMEDIA_SRTP_ENOTSUPCRYPTO;
/* check key length */
if (opt->crypto[i].key.slen &&
opt->crypto[i].key.slen <
(pj_ssize_t)crypto_suites[cs_idx].cipher_key_len)
return PJMEDIA_SRTP_EINKEYLEN;
}
}
/* Init libsrtp. */
status = pjmedia_srtp_init_lib(endpt);
if (status != PJ_SUCCESS)
return status;
pool = pjmedia_endpt_create_pool(endpt, "srtp%p", 1000, 1000);
srtp = PJ_POOL_ZALLOC_T(pool, transport_srtp);
srtp->pool = pool;
srtp->session_inited = PJ_FALSE;
srtp->bypass_srtp = PJ_FALSE;
srtp->probation_cnt = PROBATION_CNT_INIT;
if (opt) {
srtp->setting = *opt;
if (opt->use == PJMEDIA_SRTP_DISABLED)
srtp->setting.crypto_count = 0;
for (i=0; i < srtp->setting.crypto_count; ++i) {
int cs_idx = get_crypto_idx(&opt->crypto[i].name);
pj_str_t tmp_key = opt->crypto[i].key;
/* re-set crypto */
srtp->setting.crypto[i].name = pj_str(crypto_suites[cs_idx].name);
/* cut key length */
if (tmp_key.slen)
tmp_key.slen = crypto_suites[cs_idx].cipher_key_len;
pj_strdup(pool, &srtp->setting.crypto[i].key, &tmp_key);
}
} else {
pjmedia_srtp_setting_default(&srtp->setting);
}
/* If crypto count is set to zero, setup default crypto-suites,
* i.e: all available crypto but 'NULL'.
*/
if (srtp->setting.crypto_count == 0 &&
srtp->setting.use != PJMEDIA_SRTP_DISABLED)
{
srtp->setting.crypto_count = PJMEDIA_SRTP_MAX_CRYPTOS;
pjmedia_srtp_enum_crypto(&srtp->setting.crypto_count,
srtp->setting.crypto);
}
status = pj_lock_create_recursive_mutex(pool, pool->obj_name,
&srtp->mutex);
if (status != PJ_SUCCESS) {
pj_pool_release(pool);
return status;
}
/* Initialize base pjmedia_transport */
pj_memcpy(srtp->base.name, pool->obj_name, PJ_MAX_OBJ_NAME);
if (tp)
srtp->base.type = tp->type;
else
srtp->base.type = PJMEDIA_TRANSPORT_TYPE_UDP;
srtp->base.op = &transport_srtp_op;
srtp->base.user_data = srtp->setting.user_data;
/* Set underlying transport */
srtp->member_tp = tp;
/* Initialize peer's SRTP usage mode. */
srtp->peer_use = srtp->setting.use;
/* If keying count set to zero, setup default keying count & priorities */
if (srtp->setting.keying_count == 0) {
srtp->setting.keying_count = PJMEDIA_SRTP_KEYINGS_COUNT;
pjmedia_srtp_enum_keying(&srtp->setting.keying_count,
srtp->setting.keying);
}
/* Initialize SRTP keying method. */
for (i = 0; i < srtp->setting.keying_count && i < MAX_KEYING; ++i) {
switch(srtp->setting.keying[i]) {
case PJMEDIA_SRTP_KEYING_SDES:
#if defined(PJMEDIA_SRTP_HAS_SDES) && (PJMEDIA_SRTP_HAS_SDES != 0)
sdes_create(srtp, &srtp->all_keying[srtp->all_keying_cnt++]);
#endif
break;
case PJMEDIA_SRTP_KEYING_DTLS_SRTP:
#if defined(PJMEDIA_SRTP_HAS_DTLS) && (PJMEDIA_SRTP_HAS_DTLS != 0)
dtls_create(srtp, &srtp->all_keying[srtp->all_keying_cnt++]);
#endif
break;
default:
break;
}
}
/* Done */
*p_tp = &srtp->base;
return PJ_SUCCESS;
}
/*
* Get SRTP media transport setting.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_get_setting(
pjmedia_transport *tp,
pjmedia_srtp_setting *opt)
{
transport_srtp *srtp = (transport_srtp*) tp;
*opt = srtp->setting;
return PJ_SUCCESS;
}
/*
* Modify SRTP media transport setting.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_modify_setting(
pjmedia_transport *tp,
const pjmedia_srtp_setting *opt)
{
transport_srtp *srtp = (transport_srtp*) tp;
srtp->setting = *opt;
return PJ_SUCCESS;
}
/*
* Initialize and start SRTP session with the given parameters.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_start(
pjmedia_transport *tp,
const pjmedia_srtp_crypto *tx,
const pjmedia_srtp_crypto *rx)
{
transport_srtp *srtp = (transport_srtp*) tp;
srtp_policy_t tx_;
srtp_policy_t rx_;
srtp_err_status_t err;
int cr_tx_idx = 0;
int au_tx_idx = 0;
int cr_rx_idx = 0;
int au_rx_idx = 0;
pj_status_t status = PJ_SUCCESS;
PJ_ASSERT_RETURN(tp && tx && rx, PJ_EINVAL);
pj_lock_acquire(srtp->mutex);
if (srtp->session_inited) {
pjmedia_transport_srtp_stop(tp);
}
/* Get encryption and authentication method */
cr_tx_idx = au_tx_idx = get_crypto_idx(&tx->name);
if (tx->flags & PJMEDIA_SRTP_NO_ENCRYPTION)
cr_tx_idx = 0;
if (tx->flags & PJMEDIA_SRTP_NO_AUTHENTICATION)
au_tx_idx = 0;
cr_rx_idx = au_rx_idx = get_crypto_idx(&rx->name);
if (rx->flags & PJMEDIA_SRTP_NO_ENCRYPTION)
cr_rx_idx = 0;
if (rx->flags & PJMEDIA_SRTP_NO_AUTHENTICATION)
au_rx_idx = 0;
/* Check whether the crypto-suite requested is supported */
if (cr_tx_idx == -1 || cr_rx_idx == -1 || au_tx_idx == -1 ||
au_rx_idx == -1)
{
status = PJMEDIA_SRTP_ENOTSUPCRYPTO;
goto on_return;
}
/* If all options points to 'NULL' method, just bypass SRTP */
if (cr_tx_idx == 0 && cr_rx_idx == 0 && au_tx_idx == 0 && au_rx_idx == 0) {
srtp->bypass_srtp = PJ_TRUE;
goto on_return;
}
/* Check key length */
if (tx->key.slen != (pj_ssize_t)crypto_suites[cr_tx_idx].cipher_key_len ||
rx->key.slen != (pj_ssize_t)crypto_suites[cr_rx_idx].cipher_key_len)
{
status = PJMEDIA_SRTP_EINKEYLEN;
goto on_return;
}
/* Init transmit direction */
pj_bzero(&tx_, sizeof(srtp_policy_t));
pj_memmove(srtp->tx_key, tx->key.ptr, tx->key.slen);
if (cr_tx_idx && au_tx_idx)
tx_.rtp.sec_serv = sec_serv_conf_and_auth;
else if (cr_tx_idx)
tx_.rtp.sec_serv = sec_serv_conf;
else if (au_tx_idx)
tx_.rtp.sec_serv = sec_serv_auth;
else
tx_.rtp.sec_serv = sec_serv_none;
tx_.key = (uint8_t*)srtp->tx_key;
if (srtp->setting.tx_roc.roc != 0 &&
srtp->setting.tx_roc.ssrc != 0)
{
tx_.ssrc.type = ssrc_specific;
tx_.ssrc.value = srtp->setting.tx_roc.ssrc;
} else {
tx_.ssrc.type = ssrc_any_outbound;
tx_.ssrc.value = 0;
}
tx_.rtp.cipher_type = crypto_suites[cr_tx_idx].cipher_type;
tx_.rtp.cipher_key_len = crypto_suites[cr_tx_idx].cipher_key_len;
tx_.rtp.auth_type = crypto_suites[au_tx_idx].auth_type;
tx_.rtp.auth_key_len = crypto_suites[au_tx_idx].auth_key_len;
tx_.rtp.auth_tag_len = crypto_suites[au_tx_idx].srtp_auth_tag_len;
tx_.rtcp = tx_.rtp;
tx_.rtcp.auth_tag_len = crypto_suites[au_tx_idx].srtcp_auth_tag_len;
tx_.next = NULL;
err = srtp_create(&srtp->srtp_tx_ctx, &tx_);
if (err != srtp_err_status_ok) {
status = PJMEDIA_ERRNO_FROM_LIBSRTP(err);
goto on_return;
}
if (srtp->setting.tx_roc.roc != 0 &&
srtp->setting.tx_roc.ssrc != 0)
{
err = srtp_set_stream_roc(srtp->srtp_tx_ctx,
srtp->setting.tx_roc.ssrc,
srtp->setting.tx_roc.roc);
PJ_LOG(4, (THIS_FILE, "Initializing SRTP TX ROC to SSRC %d with "
"ROC %d %s\n", srtp->setting.tx_roc.ssrc,
srtp->setting.tx_roc.roc,
(err == srtp_err_status_ok)? "succeeded": "failed"));
}
srtp->tx_policy = *tx;
pj_strset(&srtp->tx_policy.key, srtp->tx_key, tx->key.slen);
srtp->tx_policy.name=pj_str(crypto_suites[get_crypto_idx(&tx->name)].name);
/* Init receive direction */
pj_bzero(&rx_, sizeof(srtp_policy_t));
pj_memmove(srtp->rx_key, rx->key.ptr, rx->key.slen);
if (cr_rx_idx && au_rx_idx)
rx_.rtp.sec_serv = sec_serv_conf_and_auth;
else if (cr_rx_idx)
rx_.rtp.sec_serv = sec_serv_conf;
else if (au_rx_idx)
rx_.rtp.sec_serv = sec_serv_auth;
else
rx_.rtp.sec_serv = sec_serv_none;
rx_.key = (uint8_t*)srtp->rx_key;
if (srtp->setting.rx_roc.roc != 0 &&
srtp->setting.rx_roc.ssrc != 0)
{
rx_.ssrc.type = ssrc_specific;
rx_.ssrc.value = srtp->setting.rx_roc.ssrc;
} else {
rx_.ssrc.type = ssrc_any_inbound;
rx_.ssrc.value = 0;
}
rx_.rtp.sec_serv = crypto_suites[cr_rx_idx].service;
rx_.rtp.cipher_type = crypto_suites[cr_rx_idx].cipher_type;
rx_.rtp.cipher_key_len = crypto_suites[cr_rx_idx].cipher_key_len;
rx_.rtp.auth_type = crypto_suites[au_rx_idx].auth_type;
rx_.rtp.auth_key_len = crypto_suites[au_rx_idx].auth_key_len;
rx_.rtp.auth_tag_len = crypto_suites[au_rx_idx].srtp_auth_tag_len;
rx_.rtcp = rx_.rtp;
rx_.rtcp.auth_tag_len = crypto_suites[au_rx_idx].srtcp_auth_tag_len;
rx_.next = NULL;
err = srtp_create(&srtp->srtp_rx_ctx, &rx_);
if (err != srtp_err_status_ok) {
srtp_dealloc(srtp->srtp_tx_ctx);
status = PJMEDIA_ERRNO_FROM_LIBSRTP(err);
goto on_return;
}
if (srtp->setting.rx_roc.roc != 0 &&
srtp->setting.rx_roc.ssrc != 0)
{
err = srtp_set_stream_roc(srtp->srtp_rx_ctx,
srtp->setting.rx_roc.ssrc,
srtp->setting.rx_roc.roc);
PJ_LOG(4, (THIS_FILE, "Initializing SRTP RX ROC from SSRC %d with "
"ROC %d %s\n",
srtp->setting.rx_roc.ssrc, srtp->setting.rx_roc.roc,
(err == srtp_err_status_ok)? "succeeded": "failed"));
}
srtp->rx_policy = *rx;
pj_strset(&srtp->rx_policy.key, srtp->rx_key, rx->key.slen);
srtp->rx_policy.name=pj_str(crypto_suites[get_crypto_idx(&rx->name)].name);
/* Declare SRTP session initialized */
srtp->session_inited = PJ_TRUE;
/* Logging stuffs */
#if PJ_LOG_MAX_LEVEL >= 5
{
char b64[PJ_BASE256_TO_BASE64_LEN(MAX_KEY_LEN)];
int b64_len;
/* TX crypto and key */
b64_len = sizeof(b64);
status = pj_base64_encode((pj_uint8_t*)tx->key.ptr, (int)tx->key.slen,
b64, &b64_len);
if (status != PJ_SUCCESS)
b64_len = pj_ansi_sprintf(b64, "--key too long--");
else
b64[b64_len] = '\0';
PJ_LOG(5, (srtp->pool->obj_name, "TX: %s key=%s",
srtp->tx_policy.name.ptr, b64));
if (srtp->tx_policy.flags) {
PJ_LOG(5,(srtp->pool->obj_name, "TX: disable%s%s",
(cr_tx_idx?"":" enc"),
(au_tx_idx?"":" auth")));
}
/* RX crypto and key */
b64_len = sizeof(b64);
status = pj_base64_encode((pj_uint8_t*)rx->key.ptr, (int)rx->key.slen,
b64, &b64_len);
if (status != PJ_SUCCESS)
b64_len = pj_ansi_sprintf(b64, "--key too long--");
else
b64[b64_len] = '\0';
PJ_LOG(5, (srtp->pool->obj_name, "RX: %s key=%s",
srtp->rx_policy.name.ptr, b64));
if (srtp->rx_policy.flags) {
PJ_LOG(5,(srtp->pool->obj_name,"RX: disable%s%s",
(cr_rx_idx?"":" enc"),
(au_rx_idx?"":" auth")));
}
}
#endif
on_return:
pj_lock_release(srtp->mutex);
return status;
}
/*
* Stop SRTP session.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_stop(pjmedia_transport *srtp)
{
transport_srtp *p_srtp = (transport_srtp*) srtp;
srtp_err_status_t err;
PJ_ASSERT_RETURN(srtp, PJ_EINVAL);
pj_lock_acquire(p_srtp->mutex);
if (!p_srtp->session_inited) {
pj_lock_release(p_srtp->mutex);
return PJ_SUCCESS;
}
err = srtp_dealloc(p_srtp->srtp_rx_ctx);
if (err != srtp_err_status_ok) {
PJ_LOG(4, (p_srtp->pool->obj_name,
"Failed to dealloc RX SRTP context: %s",
get_libsrtp_errstr(err)));
}
err = srtp_dealloc(p_srtp->srtp_tx_ctx);
if (err != srtp_err_status_ok) {
PJ_LOG(4, (p_srtp->pool->obj_name,
"Failed to dealloc TX SRTP context: %s",
get_libsrtp_errstr(err)));
}
p_srtp->srtp_rx_ctx = NULL;
p_srtp->srtp_tx_ctx = NULL;
p_srtp->session_inited = PJ_FALSE;
pj_bzero(&p_srtp->rx_policy, sizeof(p_srtp->rx_policy));
pj_bzero(&p_srtp->tx_policy, sizeof(p_srtp->tx_policy));
pj_lock_release(p_srtp->mutex);
return PJ_SUCCESS;
}
static pj_status_t start_srtp(transport_srtp *srtp)
{
/* Make sure we have the SRTP policies */
if (srtp_crypto_empty(&srtp->tx_policy_neg) ||
srtp_crypto_empty(&srtp->rx_policy_neg))
{
srtp->bypass_srtp = PJ_TRUE;
srtp->peer_use = PJMEDIA_SRTP_DISABLED;
if (srtp->session_inited) {
pjmedia_transport_srtp_stop(&srtp->base);
}
PJ_LOG(4, (srtp->pool->obj_name, "SRTP not active"));
return PJ_SUCCESS;
}
/* Got policy_local & policy_remote, let's initalize the SRTP */
/* Ticket #1075: media_start() is called whenever media description
* gets updated, e.g: call hold, however we should restart SRTP only
* when the SRTP policy settings are updated.
*/
if (srtp_crypto_cmp(&srtp->tx_policy_neg, &srtp->tx_policy) ||
srtp_crypto_cmp(&srtp->rx_policy_neg, &srtp->rx_policy))
{
pj_status_t status;
status = pjmedia_transport_srtp_start(&srtp->base,
&srtp->tx_policy_neg,
&srtp->rx_policy_neg);
if (status != PJ_SUCCESS)
return status;
/* Reset probation counts */
srtp->probation_cnt = PROBATION_CNT_INIT;
PJ_LOG(4, (srtp->pool->obj_name,
"SRTP started, keying=%s, crypto=%s",
((int)srtp->keying[0]->type==PJMEDIA_SRTP_KEYING_SDES?
"SDES":"DTLS-SRTP"),
srtp->tx_policy.name.ptr));
}
srtp->bypass_srtp = PJ_FALSE;
return PJ_SUCCESS;
}
PJ_DEF(pjmedia_transport *) pjmedia_transport_srtp_get_member(
pjmedia_transport *tp)
{
transport_srtp *srtp = (transport_srtp*) tp;
PJ_ASSERT_RETURN(tp, NULL);
return srtp->member_tp;
}
static pj_status_t transport_get_info(pjmedia_transport *tp,
pjmedia_transport_info *info)
{
transport_srtp *srtp = (transport_srtp*) tp;
pjmedia_srtp_info srtp_info;
int spc_info_idx;
unsigned i;
PJ_ASSERT_RETURN(tp && info, PJ_EINVAL);
PJ_ASSERT_RETURN(info->specific_info_cnt <
PJMEDIA_TRANSPORT_SPECIFIC_INFO_MAXCNT, PJ_ETOOMANY);
PJ_ASSERT_RETURN(sizeof(pjmedia_srtp_info) <=
PJMEDIA_TRANSPORT_SPECIFIC_INFO_MAXSIZE, PJ_ENOMEM);
srtp_info.active = srtp->session_inited;
srtp_info.rx_policy = srtp->rx_policy;
srtp_info.tx_policy = srtp->tx_policy;
srtp_info.use = srtp->setting.use;
srtp_info.peer_use = srtp->peer_use;
pj_bzero(&srtp_info.tx_roc, sizeof(srtp_info.tx_roc));
pj_bzero(&srtp_info.rx_roc, sizeof(srtp_info.rx_roc));
if (srtp->srtp_rx_ctx && srtp->rx_ssrc != 0) {
srtp_info.rx_roc.ssrc = srtp->rx_ssrc;
srtp_get_stream_roc(srtp->srtp_rx_ctx, srtp->rx_ssrc,
&srtp_info.rx_roc.roc);
} else if (srtp->setting.rx_roc.ssrc != 0) {
srtp_info.rx_roc.ssrc = srtp->setting.rx_roc.ssrc;
srtp_info.rx_roc.roc = srtp->setting.rx_roc.roc;
}
if (srtp->srtp_tx_ctx && srtp->tx_ssrc != 0) {
srtp_info.tx_roc.ssrc = srtp->tx_ssrc;
srtp_get_stream_roc(srtp->srtp_tx_ctx, srtp->tx_ssrc,
&srtp_info.tx_roc.roc);
} else if (srtp->setting.tx_roc.ssrc != 0) {
srtp_info.tx_roc.ssrc = srtp->setting.tx_roc.ssrc;
srtp_info.tx_roc.roc = srtp->setting.tx_roc.roc;
}
spc_info_idx = info->specific_info_cnt++;
info->spc_info[spc_info_idx].type = PJMEDIA_TRANSPORT_TYPE_SRTP;
info->spc_info[spc_info_idx].tp = tp;
info->spc_info[spc_info_idx].cbsize = sizeof(srtp_info);
pj_memcpy(&info->spc_info[spc_info_idx].buffer, &srtp_info,
sizeof(srtp_info));
/* Invoke get_info() from any active keying method */
for (i=0; i < srtp->keying_cnt; i++)
pjmedia_transport_get_info(srtp->keying[i], info);
return pjmedia_transport_get_info(srtp->member_tp, info);
}
static pj_status_t transport_attach2(pjmedia_transport *tp,
pjmedia_transport_attach_param *param)
{
transport_srtp *srtp = (transport_srtp*) tp;
pjmedia_transport_attach_param member_param;
pj_status_t status;
PJ_ASSERT_RETURN(tp && param, PJ_EINVAL);
/* Save the callbacks */
pj_lock_acquire(srtp->mutex);
if (param->rtp_cb || param->rtp_cb2) {
/* Do not update rtp_cb if not set, as attach() is called by
* keying method.
*/
srtp->rtp_cb = param->rtp_cb;
srtp->rtp_cb2 = param->rtp_cb2;
srtp->rtcp_cb = param->rtcp_cb;
srtp->user_data = param->user_data;
}
pj_lock_release(srtp->mutex);
/* Attach self to member transport */
member_param = *param;
member_param.user_data = srtp;
member_param.rtp_cb = NULL;
member_param.rtp_cb2 = &srtp_rtp_cb;
member_param.rtcp_cb = &srtp_rtcp_cb;
status = pjmedia_transport_attach2(srtp->member_tp, &member_param);
if (status != PJ_SUCCESS) {
pj_lock_acquire(srtp->mutex);
srtp->rtp_cb = NULL;
srtp->rtcp_cb = NULL;
srtp->user_data = NULL;
pj_lock_release(srtp->mutex);
return status;
}
/* Check if we are multiplexing RTP & RTCP. */
srtp->use_rtcp_mux = (pj_sockaddr_has_addr(&param->rem_addr) &&
pj_sockaddr_cmp(&param->rem_addr,
&param->rem_rtcp) == 0);
srtp->member_tp_attached = PJ_TRUE;
return PJ_SUCCESS;
}
static void transport_detach(pjmedia_transport *tp, void *strm)
{
transport_srtp *srtp = (transport_srtp*) tp;
PJ_UNUSED_ARG(strm);
PJ_ASSERT_ON_FAIL(tp, return);
if (srtp->member_tp) {
pjmedia_transport_detach(srtp->member_tp, srtp);
}
/* Clear up application infos from transport */
pj_lock_acquire(srtp->mutex);
srtp->rtp_cb = NULL;
srtp->rtp_cb2 = NULL;
srtp->rtcp_cb = NULL;
srtp->user_data = NULL;
pj_lock_release(srtp->mutex);
srtp->member_tp_attached = PJ_FALSE;
}
static pj_status_t transport_send_rtp( pjmedia_transport *tp,
const void *pkt,
pj_size_t size)
{
pj_status_t status;
transport_srtp *srtp = (transport_srtp*) tp;
int len = (int)size;
srtp_err_status_t err;
if (srtp->bypass_srtp)
return pjmedia_transport_send_rtp(srtp->member_tp, pkt, size);
if (size > sizeof(srtp->rtp_tx_buffer) - MAX_TRAILER_LEN)
return PJ_ETOOBIG;
pj_memcpy(srtp->rtp_tx_buffer, pkt, size);
pj_lock_acquire(srtp->mutex);
if (!srtp->session_inited) {
pj_lock_release(srtp->mutex);
return PJMEDIA_SRTP_EKEYNOTREADY;
}
/* Save outgoing SSRC */
srtp->tx_ssrc = ntohl(((pjmedia_rtp_hdr*)pkt)->ssrc);
#if TEST_ROC
if (srtp->setting.tx_roc.ssrc == 0) {
srtp_err_status_t status;
status = srtp_set_stream_roc(srtp->srtp_tx_ctx, srtp->tx_ssrc,
(srtp->offerer_side? 1: 2));
if (status == srtp_err_status_ok) {
srtp->setting.tx_roc.ssrc = srtp->tx_ssrc;
srtp->setting.tx_roc.roc = (srtp->offerer_side? 1: 2);
PJ_LOG(4, (THIS_FILE, "Setting TX ROC to SSRC %d to %d",
srtp->tx_ssrc, srtp->setting.tx_roc.roc));
}
}
#endif
err = srtp_protect(srtp->srtp_tx_ctx, srtp->rtp_tx_buffer, &len);
pj_lock_release(srtp->mutex);
if (err == srtp_err_status_ok) {
status = pjmedia_transport_send_rtp(srtp->member_tp,
srtp->rtp_tx_buffer, len);
} else {
status = PJMEDIA_ERRNO_FROM_LIBSRTP(err);
}
return status;
}
static pj_status_t transport_send_rtcp(pjmedia_transport *tp,
const void *pkt,
pj_size_t size)
{
return transport_send_rtcp2(tp, NULL, 0, pkt, size);
}
static pj_status_t transport_send_rtcp2(pjmedia_transport *tp,
const pj_sockaddr_t *addr,
unsigned addr_len,
const void *pkt,
pj_size_t size)
{
pj_status_t status;
transport_srtp *srtp = (transport_srtp*) tp;
int len = (int)size;
srtp_err_status_t err;
if (srtp->bypass_srtp) {
return pjmedia_transport_send_rtcp2(srtp->member_tp, addr, addr_len,
pkt, size);
}
if (size > sizeof(srtp->rtcp_tx_buffer) - (MAX_TRAILER_LEN+4))
return PJ_ETOOBIG;
pj_memcpy(srtp->rtcp_tx_buffer, pkt, size);
pj_lock_acquire(srtp->mutex);
if (!srtp->session_inited) {
pj_lock_release(srtp->mutex);
return PJMEDIA_SRTP_EKEYNOTREADY;
}
err = srtp_protect_rtcp(srtp->srtp_tx_ctx, srtp->rtcp_tx_buffer, &len);
pj_lock_release(srtp->mutex);
if (err == srtp_err_status_ok) {
status = pjmedia_transport_send_rtcp2(srtp->member_tp, addr, addr_len,
srtp->rtcp_tx_buffer, len);
} else {
status = PJMEDIA_ERRNO_FROM_LIBSRTP(err);
}
return status;
}
static pj_status_t transport_simulate_lost(pjmedia_transport *tp,
pjmedia_dir dir,
unsigned pct_lost)
{
transport_srtp *srtp = (transport_srtp *) tp;
PJ_ASSERT_RETURN(tp, PJ_EINVAL);
return pjmedia_transport_simulate_lost(srtp->member_tp, dir, pct_lost);
}
static pj_status_t transport_destroy (pjmedia_transport *tp)
{
transport_srtp *srtp = (transport_srtp *) tp;
pj_status_t status;
unsigned i;
PJ_ASSERT_RETURN(tp, PJ_EINVAL);
/* Close all keying. Note that any keying should not be destroyed before
* SRTP transport is destroyed as re-INVITE may initiate new keying method
* without destroying SRTP transport.
*/
for (i=0; i < srtp->all_keying_cnt; i++)
pjmedia_transport_close(srtp->all_keying[i]);
/* Close member if configured */
if (srtp->setting.close_member_tp && srtp->member_tp) {
pjmedia_transport_close(srtp->member_tp);
}
status = pjmedia_transport_srtp_stop(tp);
/* In case mutex is being acquired by other thread */
pj_lock_acquire(srtp->mutex);
pj_lock_release(srtp->mutex);
pj_lock_destroy(srtp->mutex);
pj_pool_release(srtp->pool);
return status;
}
/*
* This callback is called by transport when incoming rtp is received
*/
static void srtp_rtp_cb(pjmedia_tp_cb_param *param)
{
transport_srtp *srtp = (transport_srtp *) param->user_data;
void *pkt = param->pkt;
pj_ssize_t size = param->size;
int len = (int)size;
srtp_err_status_t err;
void (*cb)(void*, void*, pj_ssize_t) = NULL;
void (*cb2)(pjmedia_tp_cb_param*) = NULL;
void *cb_data = NULL;
if (srtp->bypass_srtp) {
if (srtp->rtp_cb2) {
pjmedia_tp_cb_param param2 = *param;
param2.user_data = srtp->user_data;
srtp->rtp_cb2(&param2);
param->rem_switch = param2.rem_switch;
} else if (srtp->rtp_cb) {
srtp->rtp_cb(srtp->user_data, pkt, size);
}
return;
}
if (size < 0) {
return;
}
/* Give the packet to keying first by invoking its send_rtp() op.
* Yes, the usage of send_rtp() is rather hacky, but it is convenient
* as the signature suits the purpose and it is ready to use
* (no futher registration/setting needed), and it may never be used
* by any keying method in the future.
*/
{
unsigned i;
pj_status_t status;
for (i=0; i < srtp->keying_cnt; i++) {
if (!srtp->keying[i]->op->send_rtp)
continue;
status = pjmedia_transport_send_rtp(srtp->keying[i], pkt, size);
if (status != PJ_EIGNORED) {
/* Packet is already consumed by the keying method */
return;
}
}
}
/* Make sure buffer is 32bit aligned */
PJ_ASSERT_ON_FAIL( (((pj_ssize_t)pkt) & 0x03)==0, return );
if (srtp->probation_cnt > 0)
--srtp->probation_cnt;
pj_lock_acquire(srtp->mutex);
if (!srtp->session_inited) {
pj_lock_release(srtp->mutex);
return;
}
/* Check if multiplexing is allowed and the payload indicates RTCP. */
if (srtp->use_rtcp_mux) {
pjmedia_rtp_hdr *hdr = (pjmedia_rtp_hdr *)pkt;
if (hdr->pt >= 64 && hdr->pt <= 95) {
pj_lock_release(srtp->mutex);
srtp_rtcp_cb(srtp, pkt, size);
return;
}
}
#if TEST_ROC
if (srtp->setting.rx_roc.ssrc == 0) {
srtp_err_status_t status;
srtp->rx_ssrc = ntohl(((pjmedia_rtp_hdr*)pkt)->ssrc);
status = srtp_set_stream_roc(srtp->srtp_rx_ctx, srtp->rx_ssrc,
(srtp->offerer_side? 2: 1));
if (status == srtp_err_status_ok) {
srtp->setting.rx_roc.ssrc = srtp->rx_ssrc;
srtp->setting.rx_roc.roc = (srtp->offerer_side? 2: 1);
PJ_LOG(4, (THIS_FILE, "Setting RX ROC from SSRC %d to %d",
srtp->rx_ssrc, srtp->setting.rx_roc.roc));
} else {
PJ_LOG(4, (THIS_FILE, "Setting RX ROC %s",
get_libsrtp_errstr(status)));
}
}
#endif
err = srtp_unprotect(srtp->srtp_rx_ctx, (pj_uint8_t*)pkt, &len);
#if PJMEDIA_SRTP_CHECK_RTP_SEQ_ON_RESTART
if (srtp->probation_cnt > 0 &&
(err == srtp_err_status_replay_old ||
err == srtp_err_status_replay_fail))
{
/* Handle such condition that stream is updated (RTP seq is reinited
* & SRTP is restarted), but some old packets are still coming
* so SRTP is learning wrong RTP seq. While the newly inited RTP seq
* comes, SRTP thinks the RTP seq is replayed, so srtp_unprotect()
* will return err_status_replay_*. Restarting SRTP can resolve this.
*/
pjmedia_srtp_crypto tx, rx;
pj_status_t status;
tx = srtp->tx_policy;
rx = srtp->rx_policy;
/* Stop SRTP first, otherwise srtp_start() will maintain current
* roll-over counter.
*/
pjmedia_transport_srtp_stop((pjmedia_transport*)srtp);
status = pjmedia_transport_srtp_start((pjmedia_transport*)srtp,
&tx, &rx);
if (status != PJ_SUCCESS) {
PJ_LOG(5,(srtp->pool->obj_name, "Failed to restart SRTP, err=%s",
get_libsrtp_errstr(err)));
} else if (!srtp->bypass_srtp) {
err = srtp_unprotect(srtp->srtp_rx_ctx, (pj_uint8_t*)pkt, &len);
}
}
#if PJMEDIA_SRTP_CHECK_ROC_ON_RESTART
else
#endif
#endif
#if PJMEDIA_SRTP_CHECK_ROC_ON_RESTART
if (srtp->probation_cnt > 0 && err == srtp_err_status_auth_fail &&
srtp->setting.prev_rx_roc.ssrc != 0 &&
srtp->setting.prev_rx_roc.ssrc == srtp->setting.rx_roc.ssrc &&
srtp->setting.prev_rx_roc.roc != srtp->setting.rx_roc.roc)
{
unsigned roc, new_roc;
srtp_err_status_t status;
srtp_get_stream_roc(srtp->srtp_rx_ctx, srtp->setting.rx_roc.ssrc,
&roc);
new_roc = (roc == srtp->setting.rx_roc.roc?
srtp->setting.prev_rx_roc.roc: srtp->setting.rx_roc.roc);
status = srtp_set_stream_roc(srtp->srtp_rx_ctx,
srtp->setting.rx_roc.ssrc, new_roc);
if (status == srtp_err_status_ok) {
PJ_LOG(4, (srtp->pool->obj_name,
"Retrying to unprotect SRTP from ROC %d to new ROC %d",
roc, new_roc));
err = srtp_unprotect(srtp->srtp_rx_ctx, (pj_uint8_t*)pkt, &len);
}
}
#endif
if (err != srtp_err_status_ok) {
PJ_LOG(5,(srtp->pool->obj_name,
"Failed to unprotect SRTP, pkt size=%d, err=%s",
size, get_libsrtp_errstr(err)));
} else {
cb = srtp->rtp_cb;
cb2 = srtp->rtp_cb2;
cb_data = srtp->user_data;
/* Save SSRC after successful SRTP unprotect */
srtp->rx_ssrc = ntohl(((pjmedia_rtp_hdr*)pkt)->ssrc);
}
pj_lock_release(srtp->mutex);
if (cb2) {
pjmedia_tp_cb_param param2 = *param;
param2.user_data = cb_data;
param2.pkt = pkt;
param2.size = len;
(*cb2)(&param2);
param->rem_switch = param2.rem_switch;
} else if (cb) {
(*cb)(cb_data, pkt, len);
}
}
/*
* This callback is called by transport when incoming rtcp is received
*/
static void srtp_rtcp_cb( void *user_data, void *pkt, pj_ssize_t size)
{
transport_srtp *srtp = (transport_srtp *) user_data;
int len = (int)size;
srtp_err_status_t err;
void (*cb)(void*, void*, pj_ssize_t) = NULL;
void *cb_data = NULL;
if (srtp->bypass_srtp) {
srtp->rtcp_cb(srtp->user_data, pkt, size);
return;
}
if (size < 0) {
return;
}
/* Make sure buffer is 32bit aligned */
PJ_ASSERT_ON_FAIL( (((pj_ssize_t)pkt) & 0x03)==0, return );
pj_lock_acquire(srtp->mutex);
if (!srtp->session_inited) {
pj_lock_release(srtp->mutex);
return;
}
err = srtp_unprotect_rtcp(srtp->srtp_rx_ctx, (pj_uint8_t*)pkt, &len);
if (err != srtp_err_status_ok) {
PJ_LOG(5,(srtp->pool->obj_name,
"Failed to unprotect SRTCP, pkt size=%d, err=%s",
size, get_libsrtp_errstr(err)));
} else {
cb = srtp->rtcp_cb;
cb_data = srtp->user_data;
}
pj_lock_release(srtp->mutex);
if (cb) {
(*cb)(cb_data, pkt, len);
}
}
static pj_status_t transport_media_create(pjmedia_transport *tp,
pj_pool_t *sdp_pool,
unsigned options,
const pjmedia_sdp_session *sdp_remote,
unsigned media_index)
{
struct transport_srtp *srtp = (struct transport_srtp*) tp;
unsigned member_tp_option;
pj_status_t keying_status = PJ_SUCCESS;
pj_status_t status;
unsigned i;
PJ_ASSERT_RETURN(tp, PJ_EINVAL);
pj_bzero(&srtp->rx_policy_neg, sizeof(srtp->rx_policy_neg));
pj_bzero(&srtp->tx_policy_neg, sizeof(srtp->tx_policy_neg));
srtp->tx_ssrc = srtp->rx_ssrc = 0;
srtp->media_option = member_tp_option = options;
srtp->offerer_side = (sdp_remote == NULL);
if (srtp->offerer_side && srtp->setting.use == PJMEDIA_SRTP_DISABLED) {
/* If we are offerer and SRTP is disabled, simply bypass SRTP and
* skip keying.
*/
srtp->bypass_srtp = PJ_TRUE;
srtp->keying_cnt = 0;
} else {
/* If we are answerer and SRTP is disabled, we need to verify that
* SRTP is disabled too in remote SDP, so we can't just skip keying.
*/
srtp->bypass_srtp = PJ_FALSE;
srtp->keying_cnt = srtp->all_keying_cnt;
for (i = 0; i < srtp->all_keying_cnt; ++i)
srtp->keying[i] = srtp->all_keying[i];
member_tp_option |= PJMEDIA_TPMED_NO_TRANSPORT_CHECKING;
}
status = pjmedia_transport_media_create(srtp->member_tp, sdp_pool,
member_tp_option, sdp_remote,
media_index);
if (status != PJ_SUCCESS)
return status;
/* Invoke media_create() of all keying methods, keying actions for each
* SRTP mode:
* - DISABLED:
* - as offerer, nothing (keying is skipped).
* - as answerer, verify remote SDP, make sure it has SRTP disabled too,
* if not, return error.
* - OPTIONAL:
* - as offerer, general initialization.
* - as answerer, optionally verify SRTP attr in remote SDP (if any).
* - MANDATORY:
* - as offerer, general initialization.
* - as answerer, verify SRTP attr in remote SDP.
*/
for (i=0; i < srtp->keying_cnt; ) {
pj_status_t st;
st = pjmedia_transport_media_create(srtp->keying[i], sdp_pool,
options, sdp_remote,
media_index);
if (st != PJ_SUCCESS) {
/* This keying method returns error, remove it */
pj_array_erase(srtp->keying, sizeof(srtp->keying[0]),
srtp->keying_cnt, i);
srtp->keying_cnt--;
keying_status = st;
continue;
} else if (srtp->offerer_side) {
/* Currently we can send one keying only in outgoing offer */
srtp->keying[0] = srtp->keying[i];
srtp->keying_cnt = 1;
break;
}
++i;
}
/* All keying method failed to process remote SDP? */
if (srtp->keying_cnt == 0)
return keying_status;
/* Bypass SRTP & skip keying as SRTP is disabled and verification on
* remote SDP has been done.
*/
if (srtp->setting.use == PJMEDIA_SRTP_DISABLED) {
srtp->bypass_srtp = PJ_TRUE;
srtp->keying_cnt = 0;
}
return PJ_SUCCESS;
}
static pj_status_t transport_encode_sdp(pjmedia_transport *tp,
pj_pool_t *sdp_pool,
pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *sdp_remote,
unsigned media_index)
{
struct transport_srtp *srtp = (struct transport_srtp*) tp;
pj_status_t keying_status = PJ_SUCCESS;
pj_status_t status;
unsigned i;
PJ_ASSERT_RETURN(tp && sdp_pool && sdp_local, PJ_EINVAL);
pj_bzero(&srtp->rx_policy_neg, sizeof(srtp->rx_policy_neg));
pj_bzero(&srtp->tx_policy_neg, sizeof(srtp->tx_policy_neg));
srtp->offerer_side = (sdp_remote == NULL);
if (!srtp->offerer_side && srtp->started) {
/* This is may be incoming reoffer that may change keying */
srtp->keying_cnt = srtp->all_keying_cnt;
for (i = 0; i < srtp->all_keying_cnt; ++i)
srtp->keying[i] = srtp->all_keying[i];
}
status = pjmedia_transport_encode_sdp(srtp->member_tp, sdp_pool,
sdp_local, sdp_remote, media_index);
if (status != PJ_SUCCESS)
return status;
/* Invoke encode_sdp() of all keying methods, keying actions for each
* SRTP mode:
* - DISABLED: nothing (keying is skipped)
* - OPTIONAL:
* - as offerer, generate offer.
* - as answerer, if remote has the same SRTP keying in SDP, verify it,
* generate answer, start crypto nego.
* - MANDATORY:
* - as offerer, generate offer.
* - as answerer, verify remote SDP, generate answer, start crypto nego.
*
* Note: because the SDP will be processed by other keying/components,
* keying must do verification on remote SDP first (e.g: keying
* is being used) before touching local SDP.
*/
for (i=0; i < srtp->keying_cnt; ) {
pj_status_t st;
st = pjmedia_transport_encode_sdp(srtp->keying[i], sdp_pool,
sdp_local, sdp_remote,
media_index);
if (st != PJ_SUCCESS) {
/* This keying method returns error, remove it */
pj_array_erase(srtp->keying, sizeof(srtp->keying[0]),
srtp->keying_cnt, i);
srtp->keying_cnt--;
keying_status = st;
continue;
} else if (!srtp->offerer_side) {
/* Answer with one keying only */
srtp->keying[0] = srtp->keying[i];
srtp->keying_cnt = 1;
break;
}
i++;
}
/* All keying method failed to process remote SDP? */
if (srtp->keying_cnt == 0) {
if (keying_status != PJ_SUCCESS) {
DEACTIVATE_MEDIA(sdp_pool, sdp_local->media[media_index]);
}
return keying_status;
}
/* Bypass SRTP & skip keying as SRTP is disabled and verification on
* remote SDP has been done.
*/
if (srtp->setting.use == PJMEDIA_SRTP_DISABLED) {
srtp->bypass_srtp = PJ_TRUE;
srtp->keying_cnt = 0;
}
if (srtp->keying_cnt != 0) {
/* At this point for now, keying count should be 1 */
pj_assert(srtp->keying_cnt == 1);
PJ_LOG(4, (srtp->pool->obj_name, "SRTP uses keying method %s",
((int)srtp->keying[0]->type==PJMEDIA_SRTP_KEYING_SDES?
"SDES":"DTLS-SRTP")));
}
return PJ_SUCCESS;
}
static pj_status_t transport_media_start(pjmedia_transport *tp,
pj_pool_t *pool,
const pjmedia_sdp_session *sdp_local,
const pjmedia_sdp_session *sdp_remote,
unsigned media_index)
{
struct transport_srtp *srtp = (struct transport_srtp*) tp;
pj_status_t keying_status = PJ_SUCCESS;
pj_status_t status;
unsigned i;
PJ_ASSERT_RETURN(tp, PJ_EINVAL);
/* At this point for now, keying count should be 0 or 1 */
pj_assert(srtp->keying_cnt <= 1);
srtp->started = PJ_TRUE;
status = pjmedia_transport_media_start(srtp->member_tp, pool,
sdp_local, sdp_remote,
media_index);
if (status != PJ_SUCCESS)
return status;
/* Invoke media_start() of all keying methods, keying actions for each
* SRTP mode:
* - DISABLED: nothing (keying is skipped)
* - OPTIONAL:
* - as offerer, if remote answer has the same SRTP keying in SDP,
* verify it and start crypto nego.
* - as answerer, start crypto nego if not yet (usually initated in
* encode_sdp()).
* - MANDATORY:
* - as offerer, verify remote answer and start crypto nego.
* - as answerer, start crypto nego if not yet (usually initated in
* encode_sdp()).
*/
for (i=0; i < srtp->keying_cnt; ) {
status = pjmedia_transport_media_start(srtp->keying[i], pool,
sdp_local, sdp_remote,
media_index);
if (status != PJ_SUCCESS) {
/* This keying method returns error, remove it */
pj_array_erase(srtp->keying, sizeof(srtp->keying[0]),
srtp->keying_cnt, i);
srtp->keying_cnt--;
keying_status = status;
continue;
}
if (!srtp_crypto_empty(&srtp->tx_policy_neg) &&
!srtp_crypto_empty(&srtp->rx_policy_neg))
{
/* SRTP nego is done */
srtp->keying_cnt = 1;
srtp->keying[0] = srtp->keying[i];
srtp->keying_pending_cnt = 0;
break;
}
i++;
}
/* All keying method failed to process remote SDP? */
if (srtp->keying_cnt == 0)
return keying_status;
/* If SRTP key is being negotiated, just return now.
* The keying method should start the SRTP once keying nego is done.
*/
if (srtp->keying_pending_cnt)
return PJ_SUCCESS;
/* Start SRTP */
status = start_srtp(srtp);
return status;
}
static pj_status_t transport_media_stop(pjmedia_transport *tp)
{
struct transport_srtp *srtp = (struct transport_srtp*) tp;
pj_status_t status;
unsigned i;
PJ_ASSERT_RETURN(tp, PJ_EINVAL);
srtp->started = PJ_FALSE;
/* Invoke media_stop() of all keying methods */
for (i=0; i < srtp->keying_cnt; ++i) {
pjmedia_transport_media_stop(srtp->keying[i]);
}
/* Invoke media_stop() of member tp */
status = pjmedia_transport_media_stop(srtp->member_tp);
if (status != PJ_SUCCESS)
PJ_PERROR(4, (srtp->pool->obj_name, status,
"SRTP failed stop underlying media transport."));
/* Finally, stop SRTP */
return pjmedia_transport_srtp_stop(tp);
}
/* Utility */
PJ_DEF(pj_status_t) pjmedia_transport_srtp_decrypt_pkt(pjmedia_transport *tp,
pj_bool_t is_rtp,
void *pkt,
int *pkt_len)
{
transport_srtp *srtp = (transport_srtp *)tp;
srtp_err_status_t err;
if (srtp->bypass_srtp)
return PJ_SUCCESS;
PJ_ASSERT_RETURN(tp && pkt && (*pkt_len>0), PJ_EINVAL);
PJ_ASSERT_RETURN(srtp->session_inited, PJ_EINVALIDOP);
/* Make sure buffer is 32bit aligned */
PJ_ASSERT_ON_FAIL( (((pj_ssize_t)pkt) & 0x03)==0, return PJ_EINVAL);
pj_lock_acquire(srtp->mutex);
if (!srtp->session_inited) {
pj_lock_release(srtp->mutex);
return PJ_EINVALIDOP;
}
if (is_rtp)
err = srtp_unprotect(srtp->srtp_rx_ctx, pkt, pkt_len);
else
err = srtp_unprotect_rtcp(srtp->srtp_rx_ctx, pkt, pkt_len);
if (err != srtp_err_status_ok) {
PJ_LOG(5,(srtp->pool->obj_name,
"Failed to unprotect SRTP, pkt size=%d, err=%s",
*pkt_len, get_libsrtp_errstr(err)));
}
pj_lock_release(srtp->mutex);
return (err==srtp_err_status_ok) ? PJ_SUCCESS :
PJMEDIA_ERRNO_FROM_LIBSRTP(err);
}
#endif
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