/*

* Copyright (c) 2004-2006 Maxim Sobolev <sobomax@FreeBSD.org>

* Copyright (c) 2006-2007 Sippy Software, Inc., http://www.sippysoft.com

* All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

*

* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

* SUCH DAMAGE.

*

* $Id: rtpp_session.c,v 1.13 2008/12/24 10:46:03 sobomax Exp $

*

*/

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/un.h>

#include <assert.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "rtpp_defines.h"

#include "rtpp_log.h"

#include "rtpp_record.h"

#include "rtpp_session.h"

#include "rtpp_util.h"

#include "rtp_transcoder.h"

#include "rtpp_mem.h"

extern struct rtp_data_list* active_resized_sp_list;

extern int g_use_timed_resizer;

void

init_hash_table(struct cfg *cf)

{

int i;

for (i = 0; i < 256; i++)

{

cf->rand_table[i] = random();

}

}

static uint8_t

hash_string(struct cfg *cf, char *bp, char *ep)

{

uint8_t res;

for (res = cf->rand_table[0]; bp[0] != '\0' && bp != ep; bp++)

{

res = cf->rand_table[res ^ bp[0]];

}

return res;

}

void

hash_table_append(struct cfg *cf, struct rtpp_session *sp)

{

uint8_t hash;

struct rtpp_session *tsp;

assert(sp->rtcp != NULL);

hash = hash_string(cf, sp->call_id, NULL);

tsp = cf->hash_table[hash];

if (tsp == NULL)

{

cf->hash_table[hash] = sp;

sp->prev = sp->next = NULL;

return;

}

while (tsp->next != NULL)

{

tsp = tsp->next;

}

tsp->next = sp;

sp->prev = tsp;

sp->next = NULL;

}

static void

hash_table_remove(struct cfg *cf, struct rtpp_session *sp)

{

uint8_t hash;

assert(sp->rtcp != NULL);

if (sp->prev != NULL)

{

sp->prev->next = sp->next;

if (sp->next != NULL)

{

sp->next->prev = sp->prev;

}

return;

}

hash = hash_string(cf, sp->call_id, NULL);

/* Make sure we are removing the right session */

assert(cf->hash_table[hash] == sp);

cf->hash_table[hash] = sp->next;

if (sp->next != NULL)

{

sp->next->prev = NULL;

}

}

struct rtpp_session *

session_findfirst(struct cfg *cf, char *call_id)

{

uint8_t hash;

struct rtpp_session *sp;

hash = hash_string(cf, call_id, NULL);

for (sp = cf->hash_table[hash]; sp != NULL; sp = sp->next)

{

if (strcmp(sp->call_id, call_id) == 0)

{

break;

}

}

return(sp);

}

struct rtpp_session *

session_findnext(struct rtpp_session *psp)

{

struct rtpp_session *sp;

for (sp = psp->next; sp != NULL; sp = sp->next)

{

if (strcmp(sp->call_id, psp->call_id) == 0)

{

break;

}

}

return(sp);

}

void

append_session(struct cfg *cf, struct rtpp_session *sp, int index)

{

if (sp->fds[index] != -1)

{

cf->sessions[cf->nsessions] = sp;

cf->pfds[cf->nsessions].fd = sp->fds[index];

cf->pfds[cf->nsessions].events = POLLIN;

cf->pfds[cf->nsessions].revents = 0;

sp->sidx[index] = cf->nsessions;

rtpp_log_write(RTPP_LOG_INFO, sp->log, "appended-fd:%d session:%d\n", cf->pfds[cf->nsessions].fd, cf->nsessions);

cf->nsessions++;

}

else

{

sp->sidx[index] = -1;

}

}

void

remove_session(struct cfg *cf, struct rtpp_session *sp)

{

int i;

rtpp_log_write(RTPP_LOG_INFO, sp->log, "RTP stats: %lu in from callee, %lu "

"in from caller, %lu relayed, %lu dropped", sp->pcount[0], sp->pcount[1],

sp->pcount[2], sp->pcount[3]);

rtpp_log_write(RTPP_LOG_INFO, sp->log, "RTCP stats: %lu in from callee, %lu "

"in from caller, %lu relayed, %lu dropped", sp->rtcp->pcount[0],

sp->rtcp->pcount[1], sp->rtcp->pcount[2], sp->rtcp->pcount[3]);

rtpp_log_write(RTPP_LOG_INFO, sp->log, "session on ports %d/%d is cleaned up",

sp->ports[0], sp->ports[1]);

for (i = 0; i < 2; i++)

{

if (sp->addr[i] != NULL)

free(sp->addr[i]);

if (sp->prev_addr[i] != NULL)

free(sp->prev_addr[i]);

if (sp->rtcp->addr[i] != NULL)

free(sp->rtcp->addr[i]);

if (sp->rtcp->prev_addr[i] != NULL)

free(sp->rtcp->prev_addr[i]);

//if(sp->stream[i]->bio != NULL) {

// BIO_free(sp->stream[i]->bio);

//}

if (sp->stream[i] != NULL)

{

rtpp_dtls_free_stream(sp->stream[i]);

}

if (sp->rtcp->stream[i] != NULL)

{

rtpp_dtls_free_stream(sp->rtcp->stream[i]);

}

if (sp->fds[i] != -1)

{

close(sp->fds[i]);

assert(cf->sessions[sp->sidx[i]] == sp);

cf->sessions[sp->sidx[i]] = NULL;

assert(cf->pfds[sp->sidx[i]].fd == sp->fds[i]);

cf->pfds[sp->sidx[i]].fd = -1;

cf->pfds[sp->sidx[i]].events = 0;

}

if (sp->rtcp->fds[i] != -1)

{

close(sp->rtcp->fds[i]);

assert(cf->sessions[sp->rtcp->sidx[i]] == sp->rtcp);

cf->sessions[sp->rtcp->sidx[i]] = NULL;

assert(cf->pfds[sp->rtcp->sidx[i]].fd == sp->rtcp->fds[i]);

cf->pfds[sp->rtcp->sidx[i]].fd = -1;

cf->pfds[sp->rtcp->sidx[i]].events = 0;

}

if (sp->rrcs[i] != NULL)

rclose(sp, sp->rrcs[i], 1);

if (sp->rtcp->rrcs[i] != NULL)

rclose(sp, sp->rtcp->rrcs[i], 1);

if (sp->rtps[i] != NULL)

{

cf->rtp_servers[sp->sridx] = NULL;

rtp_server_free(sp->rtps[i]);

}

if (sp->codecs[i] != NULL)

free(sp->codecs[i]);

if (sp->rtcp->codecs[i] != NULL)

free(sp->rtcp->codecs[i]);

if (sp->bridgeBindAddr[i] != NULL) // VLAN Support (FRN4811)

free(sp->bridgeBindAddr[i]);

if (sp->ice_u[i] != NULL)

{

if (sp->ice_u[i]->local_user_name != NULL)

free(sp->ice_u[i]->local_user_name);

if (sp->ice_u[i]->local_password != NULL)

free(sp->ice_u[i]->local_password);

if (sp->ice_u[i]->remote_user_name != NULL)

free(sp->ice_u[i]->remote_user_name);

if (sp->ice_u[i]->remote_password != NULL)

free(sp->ice_u[i]->remote_password);

free(sp->ice_u[i]);

}

if (sp->ice_candidate_list[i] != NULL) // ICE remote candidate support

delete_ice_candidate(sp, i);

if (sp->rtcp->ice_candidate_list[i] != NULL)

delete_ice_candidate(sp->rtcp, i);

if (sp->transcode)

rtp_transcoder_free(&sp->trans[i],cf);

if (sp->secure)

{

rtpp_srtp_free_context(&sp->srtp[i]);

rtpp_srtp_free_context(&sp->rtcp->srtp[i]);

}

rtp_resizer_free(&sp->resizers[i]);

}// for

rtpp_stun_agent_remove(sp); //Remove stun agent Context.

remove_session_frm_active_rsz_lst(sp);

rtpp_log_write(RTPP_LOG_INFO, sp->log, "timed resizer lists cleaned up");

if (sp->timeout_data.notify_tag != NULL)

free(sp->timeout_data.notify_tag);

hash_table_remove(cf, sp);

if (sp->call_id != NULL)

free(sp->call_id);

if (sp->tag != NULL)

free(sp->tag);

rtpp_log_close(sp->log);

free(sp->rtcp);

free(sp);

cf->sessions_active--;

}

int

compare_session_tags(char *tag1, char *tag0, unsigned *medianum_p)

{

size_t len0 = strlen(tag0);

if (!strncmp(tag1, tag0, len0))

{

if (tag1[len0] == ';')

{

if (medianum_p != NULL)

*medianum_p = strtoul(tag1 + len0 + 1, NULL, 10);

return 2;

}

if (tag1[len0] == '\0')

return 1;

return 0;

}

return 0;

}

int

find_stream(struct cfg *cf, char *call_id, char *from_tag, char *to_tag,

struct rtpp_session **spp)

{

char *cp1, *cp2;

for (*spp = session_findfirst(cf, call_id); *spp != NULL; *spp = session_findnext(*spp))

{

if (strcmp((*spp)->tag, from_tag) == 0)

{

return 0;

}

else if (to_tag != NULL)

{

switch (compare_session_tags((*spp)->tag, to_tag, NULL))

{

case 1:

/* Exact tag match */

return 1;

case 2:

/*

* Reverse tag match without medianum. Medianum is always

* applied to the from tag, verify that.

*/

cp1 = strrchr((*spp)->tag, ';');

cp2 = strrchr(from_tag, ';');

if (cp2 != NULL && strcmp(cp1, cp2) == 0)

return 1;

break;

default:

break;

}

}

}

return -1;

}

static void

reconnect_timeout_handler(struct rtpp_session *sp, struct rtpp_timeout_handler *th)

{

struct sockaddr_un remote;

assert(th->socket_name != NULL && th->connected == 0);

if (th->fd == -1)

{

rtpp_log_write(RTPP_LOG_DBUG, sp->log, "connecting timeout socket");

}

else

{

rtpp_log_write(RTPP_LOG_DBUG, sp->log, "reconnecting timeout socket");

close(th->fd);

}

th->fd = socket(AF_UNIX, SOCK_STREAM, 0);

if (th->fd == -1)

{

rtpp_log_ewrite(RTPP_LOG_ERR, sp->log, "can't create timeout socket");

return;

}

remote.sun_family = AF_LOCAL;

strncpy(remote.sun_path, th->socket_name, sizeof(remote.sun_path) - 1);

#if defined(HAVE_SOCKADDR_SUN_LEN)

remote.sun_len = strlen(remote.sun_path);

#endif

if (connect(th->fd, (struct sockaddr *)&remote, sizeof(remote)) == -1)

{

rtpp_log_ewrite(RTPP_LOG_ERR, sp->log, "can't connect to timeout socket");

}

else

{

th->connected = 1;

}

}

void

do_timeout_notification(struct rtpp_session *sp, int retries)

{

int result, len;

struct rtpp_timeout_handler *th = sp->timeout_data.handler;

if (th == NULL)

return;

if (th->connected == 0)

{

reconnect_timeout_handler(sp, th);

/* If connect fails, no notification will be sent */

if (th->connected == 0)

{

rtpp_log_write(RTPP_LOG_ERR, sp->log, "unable to send timeout notification");

return;

}

}

if (sp->timeout_data.notify_tag == NULL)

{

len = snprintf(th->notify_buf, sizeof(th->notify_buf), "%d %d\n",

sp->ports[0], sp->ports[1]);

}

else

{

len = snprintf(th->notify_buf, sizeof(th->notify_buf), "%s\n",

sp->timeout_data.notify_tag);

}

assert(len < (int)sizeof(th->notify_buf));

do

{

result = send(th->fd, th->notify_buf, len, 0);

} while (len == -1 && errno == EINTR);

if (result < 0)

{

th->connected = 0;

rtpp_log_ewrite(RTPP_LOG_ERR, sp->log, "failed to send timeout notification");

if (retries > 0)

do_timeout_notification(sp, retries - 1);

}

}

int

get_ttl(struct rtpp_session *sp)

{

switch (sp->ttl_mode)

{

case TTL_UNIFIED:

return(MAX(sp->ttl[0], sp->ttl[1]));

case TTL_INDEPENDENT:

return(MIN(sp->ttl[0], sp->ttl[1]));

default:

/* Shouldn't happen[tm] */

break;

}

abort();

return 0;

}

void clean_session_rsz_pkt_list(struct rtpp_session *sp, int idx)

{

if (g_use_timed_resizer)

{

rtp_data_list_destroy(&(sp->rsz_pckt_list[idx]));

rtp_data_list_init(&sp->rsz_pckt_list[idx]);

sp->incr_pkt_ts[idx]=0;

sp->marker_status[idx]=0;

}

}

void remove_session_frm_active_rsz_lst(struct rtpp_session *sp)

{

if (g_use_timed_resizer)

{

rtp_data_node* cur = (rtp_data_node*)active_resized_sp_list->head;

int n=0;

for (n=0; n < active_resized_sp_list->node_count; n++)

{

if (cur==NULL) break;

struct active_rsz_sp* sptmp = (active_rsz_sp*)(cur->data);

if (sptmp && sptmp->rsz_sp == sp)

{

rtp_data_list_remove(cur->data, active_resized_sp_list);

break;

}

cur=cur->next;

}

}

clean_session_rsz_pkt_list(sp, 0);

clean_session_rsz_pkt_list(sp, 1);

}

// ICE candidates support

struct remote_ice_candidate*

find_ice_candidate(struct rtpp_session *sp, int ridx, struct sockaddr *raddr, int addr_len)

{

struct remote_ice_candidate *pi = NULL;

struct sockaddr_in *remote = (struct sockaddr_in*)raddr;

for (pi = sp->ice_candidate_list[ridx]; pi != NULL; pi = pi->next)

{

// if ip address and port is the same

struct sockaddr_in *candidate = (struct sockaddr_in*)(pi->addr);

if (candidate->sin_addr.s_addr == remote->sin_addr.s_addr && candidate->sin_port == remote->sin_port)

{

break;

}

}

/* Return the First Candidate as Default for the corresponding sp */

if (pi == NULL)

return sp->ice_candidate_list[ridx];

return pi;

}

void

append_ice_candidate(struct cfg *cf, struct remote_ice_candidate **head, struct remote_ice_candidate **candidate)

{

struct remote_ice_candidate *pi = *head;

if ((*head) == NULL)

{

*head = *candidate;

(*head)->prev = NULL;

return;

}

while (pi->next != NULL)

{

pi = pi->next;

}

pi->next = *candidate;

(*candidate)->prev = *head;

}

void

delete_ice_candidate(struct rtpp_session *sp, int ridx)

{

struct remote_ice_candidate *pi;

pi = sp->ice_candidate_list[ridx];

if (pi == NULL)

{

return;

}

while (pi->next != NULL)

{

pi = pi->next;

}

while (pi->prev != NULL)

{

pi = pi->prev;

free(pi->next->addr);

free(pi->next);

pi->next = NULL;

}

free(pi->addr);

free(pi);

sp->ice_candidate_list[ridx] = NULL;

}