/* * 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 1.2 2008/04/03 17:48:45 sobomax Exp $ * */#include <sys/types.h>#include <assert.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"voidinit_hash_table(struct cfg *cf){    int i;    for (i = 0; i < 256; i++) {	cf->rand_table[i] = random();    }}static uint8_thash_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;}voidhash_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);    rtpp_log_write(RTPP_LOG_DBUG, cf->glog, "hash_table_append: hash(%s) = %d", sp->call_id, hash);    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 voidhash_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 *hash_table_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 *hash_table_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);}voidappend_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;	cf->nsessions++;    } else {	sp->sidx[index] = -1;    }}voidremove_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->rtcp->addr[i] != NULL)	    free(sp->rtcp->addr[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]);	if (sp->rtcp->rrcs[i] != NULL)	    rclose(sp, sp->rtcp->rrcs[i]);	if (sp->rtps[i] != NULL) {	    cf->rtp_servers[sp->sridx] = NULL;	    rtp_server_free(sp->rtps[i]);	}    }    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);    rtp_resizer_free(&sp->resizers[0]);    rtp_resizer_free(&sp->resizers[1]);    free(sp);    cf->sessions_active--;}intcompare_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;}intfind_stream(struct cfg *cf, char *call_id, char *from_tag, char *to_tag,  struct rtpp_session **spp){    for (*spp = hash_table_findfirst(cf, call_id); *spp != NULL; *spp = hash_table_findnext(*spp)) {	if (strcmp((*spp)->tag, from_tag) == 0) {	    return 0;	} else if (to_tag != NULL && strcmp((*spp)->tag, to_tag) == 0) {	    return 1;	}    }    return -1;}