/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <pthread.h>
#include <sip.h>

#include "sip_msg.h"
#include "sip_miscdefs.h"
#include "sip_xaction.h"
#include "sip_dialog.h"
#include "sip_parse_generic.h"

void            (*sip_ulp_recv)(const sip_conn_object_t, sip_msg_t,
                    const sip_dialog_t) = NULL;
uint_t          (*sip_stack_timeout)(void *, void (*func)(void *),
                    struct timeval *) = NULL;
boolean_t       (*sip_stack_untimeout)(uint_t) = NULL;
int             (*sip_stack_send)(sip_conn_object_t xonn_object, char *, int) =
                    NULL;
void            (*sip_refhold_conn)(sip_conn_object_t) = NULL;
void            (*sip_refrele_conn)(sip_conn_object_t) = NULL;
boolean_t       (*sip_is_conn_stream)(sip_conn_object_t) = NULL;
boolean_t       (*sip_is_conn_reliable)(sip_conn_object_t) = NULL;
int             (*sip_conn_rem_addr)(sip_conn_object_t, struct sockaddr *,
                    socklen_t *) = NULL;
int             (*sip_conn_local_addr)(sip_conn_object_t, struct sockaddr *,
                    socklen_t *) = NULL;
int             (*sip_conn_transport)(sip_conn_object_t) = NULL;
int             (*sip_conn_timer1)(sip_conn_object_t) = NULL;
int             (*sip_conn_timer2)(sip_conn_object_t) = NULL;
int             (*sip_conn_timer4)(sip_conn_object_t) = NULL;
int             (*sip_conn_timerd)(sip_conn_object_t) = NULL;

boolean_t       sip_manage_dialog = B_FALSE;

uint64_t        sip_hash_salt = 0;

/*
 * Defaults, overridden by configured values, if any
 */
int             sip_timer_T1 = SIP_TIMER_T1;
int             sip_timer_T2 = SIP_TIMER_T2;
int             sip_timer_T4 = SIP_TIMER_T4;
int             sip_timer_TD = 32 * SIP_SECONDS;

/*
 * list of sent-by values registered by the UA
 */
sent_by_list_t  *sip_sent_by = NULL;
int             sip_sent_by_count = 0;
pthread_mutex_t sip_sent_by_lock;

/*
 * Create and send an error response
 */
static void
sip_send_resp(sip_conn_object_t conn_obj, _sip_msg_t *sip_msg, int resp)
{
        _sip_msg_t              *sip_msg_resp;

        sip_msg_resp = (_sip_msg_t *)sip_create_response((sip_msg_t)sip_msg,
            resp, sip_get_resp_desc(resp), NULL, NULL);
        if (sip_msg_resp == NULL) {
                /*
                 * Message was too bad to even create a
                 * response. Just drop the messge.
                 */
                return;
        }
        /*
         * We directly send it to the transport here.
         */
        if (sip_adjust_msgbuf(sip_msg_resp) != 0) {
                sip_free_msg((sip_msg_t)sip_msg_resp);
                return;
        }

        SIP_UPDATE_COUNTERS(B_FALSE, 0, resp, B_TRUE, sip_msg_resp->
            sip_msg_len);
        (void) sip_stack_send(conn_obj, sip_msg_resp->sip_msg_buf,
            sip_msg_resp->sip_msg_len);
        sip_free_msg((sip_msg_t)sip_msg_resp);
}

/*
 * Validate some of the common headers
 */
boolean_t
sip_check_common_headers(sip_conn_object_t conn_obj, _sip_msg_t *sip_msg)
{
        int     err;

        if (sip_get_to_uri_str((sip_msg_t)sip_msg, &err) == NULL)
                goto error;
        if (sip_get_from_uri_str((sip_msg_t)sip_msg, &err) == NULL)
                goto error;
        if (sip_get_callseq_num((sip_msg_t)sip_msg, &err) < 0)
                goto error;
        if (sip_get_callid((sip_msg_t)sip_msg, &err) == NULL)
                goto error;
        return (B_FALSE);
error:
        sip_send_resp(conn_obj, sip_msg, SIP_BAD_REQUEST);
        return (B_TRUE);
}

/*
 * setup pointers to where the headers are.
 */
static int
sip_setup_header_pointers(_sip_msg_t *sip_msg)
{
        char            *msg;
        _sip_header_t   *sip_msg_header;
        char            *end;

        msg = sip_msg->sip_msg_buf;
        end = sip_msg->sip_msg_buf + sip_msg->sip_msg_len;
        /*
         * Skip while space.
         */
        while (isspace(*msg)) {
                if (msg < end)
                        msg++;
                else
                        return (EINVAL);
        }

        /*
         * We consider Request and Response line as a header
         */
        for (;;) {
                /*
                 * Skip CRLF
                 */
                if (strncmp(SIP_CRLF, msg, strlen(SIP_CRLF)) == 0) {
                        if (sip_msg->sip_msg_headers_end != NULL) {
                                SKIP_CRLF(msg);
                                sip_msg->sip_msg_headers_end->sip_hdr_end = msg;
                        }
                        /*
                         * Start of a header.
                         * Check for empty line.
                         */
                        if (strncmp(SIP_CRLF, msg, strlen(SIP_CRLF)) == 0) {
                                /*
                                 * empty line, start of content.
                                 */
                                SKIP_CRLF(msg);
                                sip_msg->sip_msg_headers_end->sip_hdr_end = msg;
                                break;
                        }
                        /*
                         * store start of header.
                         */
                        sip_msg_header = calloc(1, sizeof (_sip_header_t));
                        if (sip_msg_header == NULL)
                                return (EINVAL);
                        sip_msg_header->sip_hdr_start = msg;
                        sip_msg_header->sip_hdr_current = msg;
                        sip_msg_header->sip_hdr_allocated = B_FALSE;
                        sip_msg_header->sip_hdr_prev =
                            sip_msg->sip_msg_headers_end;
                        sip_msg_header->sip_hdr_next = NULL;
                        sip_msg_header->sip_hdr_sipmsg = sip_msg;
                        sip_msg->sip_msg_headers_end->sip_hdr_next =
                            sip_msg_header;
                        sip_msg->sip_msg_headers_end = sip_msg_header;
                } else {
                        if (sip_msg->sip_msg_headers_start == NULL) {
                                /*
                                 * Allocate first header structure.
                                 */
                                sip_msg_header = calloc(1,
                                    sizeof (_sip_header_t));
                                if (sip_msg_header == NULL)
                                        return (EINVAL);
                                sip_msg_header->sip_hdr_allocated = B_FALSE;
                                sip_msg_header->sip_hdr_start = msg;
                                sip_msg_header->sip_hdr_current = msg;
                                sip_msg_header->sip_hdr_sipmsg = sip_msg;
                                sip_msg->sip_msg_headers_start = sip_msg_header;
                                sip_msg->sip_msg_headers_end = sip_msg_header;
                        }
                        msg++;
                }
                /*
                 * We have reached the end without hitting the empty line.
                 */
                if (msg - sip_msg->sip_msg_buf >= sip_msg->sip_msg_len)
                        return (EINVAL);
        }

        if (sip_msg->sip_msg_headers_start == NULL)
                return (EPROTO);

        /*
         * Move start line to be a separate line.
         */
        sip_msg->sip_msg_start_line = sip_msg->sip_msg_headers_start;
        sip_msg->sip_msg_headers_start =
            sip_msg->sip_msg_headers_start->sip_hdr_next;
        sip_msg->sip_msg_start_line->sip_hdr_prev = NULL;
        sip_msg->sip_msg_start_line->sip_hdr_next = NULL;

        if (sip_msg->sip_msg_headers_start == NULL)
                return (EINVAL);
        sip_msg->sip_msg_headers_start->sip_hdr_prev = NULL;


        /*
         * Deal with content.
         */
        sip_msg->sip_msg_content = calloc(1, sizeof (sip_content_t));
        sip_msg->sip_msg_content->sip_content_start = msg;
        sip_msg->sip_msg_content->sip_content_end = sip_msg->sip_msg_buf +
            sip_msg->sip_msg_len;
        sip_msg->sip_msg_content->sip_content_allocated = B_FALSE;
        sip_msg->sip_msg_content_len =
            sip_msg->sip_msg_content->sip_content_end -
            sip_msg->sip_msg_content->sip_content_start;
        return (0);
}

/*
 * The send interface to the sip stack. Used by upper layers.
 */
int
sip_sendmsg(sip_conn_object_t obj, sip_msg_t sip_msg, sip_dialog_t dialog,
    uint32_t flags)
{
        sip_xaction_t           *sip_trans = NULL;
        int                     ret = 0;
        sip_message_type_t      *sip_msg_info;
        _sip_msg_t              *_sip_msg;
        boolean_t               stateful = flags & SIP_SEND_STATEFUL;
        boolean_t               dlg_on_fork = flags & SIP_DIALOG_ON_FORK;

        sip_refhold_conn(obj);

        _sip_msg = (_sip_msg_t *)sip_msg;
        if ((ret = sip_adjust_msgbuf(_sip_msg)) != 0) {
                sip_refrele_conn(obj);
                return (ret);
        }

        assert(_sip_msg->sip_msg_req_res != NULL);
        sip_msg_info = _sip_msg->sip_msg_req_res;
        /*
         * Send it statefully if:
         * if stateful is set in 'flags' AND
         * this is not an ACK request, if it is a request (should the upper
         * layer set stateful in the latter case?, i.e is the check
         * necessary here?)
         */
        if (stateful && (!sip_msg_info->is_request ||
            sip_msg_info->sip_req_method != ACK)) {
                sip_trans = (sip_xaction_t *)sip_xaction_get(obj, sip_msg,
                    B_TRUE, sip_msg_info->is_request ? SIP_CLIENT_TRANSACTION :
                    SIP_SERVER_TRANSACTION, &ret);
                if (sip_trans == NULL) {
                        sip_refrele_conn(obj);
                        return (ret);
                }
                ret = sip_xaction_output(obj, sip_trans, _sip_msg);
                SIP_XACTION_REFCNT_DECR(sip_trans);
                if (ret != 0) {
                        sip_refrele_conn(obj);
                        return (ret);
                }
        }
        /*
         * If the appln wants us to create the dialog, create a partial
         * dialog at this stage, when we get the response, we will
         * complete it.
         */
        if (sip_manage_dialog) {
                if (sip_msg_info->is_request && dialog == NULL) {
                        dialog = (sip_dialog_t)sip_seed_dialog(obj, sip_msg,
                            dlg_on_fork, SIP_UAC_DIALOG);
                } else if (dialog != NULL && (!sip_msg_info->is_request ||
                    sip_msg_info->sip_req_method == NOTIFY)) {
                        (void) sip_update_dialog(dialog, _sip_msg);
                } else if (dialog != NULL) {
                        /*
                         * Dialog is in CONFIRMED state. If logging is enabled
                         * track the SIP message sent within a dialog.
                         */
                        (void) pthread_mutex_lock(&dialog->sip_dlg_mutex);
                        dialog->sip_dlg_msgcnt++;
                        sip_add_log(&dialog->sip_dlg_log[dialog->sip_dlg_state],
                            (sip_msg_t)sip_msg, dialog->sip_dlg_msgcnt,
                            SIP_DIALOG_LOG);
                        (void) pthread_mutex_unlock(&dialog->sip_dlg_mutex);

                        if (sip_msg_info->is_request && sip_msg_info->
                            sip_req_method == INVITE) {
                                (void) sip_dialog_add_new_contact(dialog,
                                    _sip_msg);
                        }
                }
        }
        /*
         * if measure sip traffic is enabled, capture the measurements
         * Is this the right place to measure or should I put this after
         * the call to sip_stack_send()
         */
        if (sip_msg_info->is_request) {
                SIP_UPDATE_COUNTERS(B_TRUE, sip_msg_info->sip_req_method, 0,
                    B_TRUE, _sip_msg->sip_msg_len);
        } else {
                SIP_UPDATE_COUNTERS(B_FALSE, 0, sip_msg_info->sip_resp_code,
                    B_TRUE, _sip_msg->sip_msg_len);
        }
        if ((ret = sip_stack_send(obj, _sip_msg->sip_msg_buf,
            _sip_msg->sip_msg_len)) != 0) {
                if (sip_trans != NULL) {
                        sip_xaction_terminate(sip_trans, _sip_msg,
                            sip_conn_transport(obj));
                }
                sip_refrele_conn(obj);
                return (ret);
        }
        sip_refrele_conn(obj);
        return (ret);
}

/*
 * Given a sent-by value check if it is in the registered list. If no values
 * have been registered, the check passes.
 */
static boolean_t
sip_sent_by_registered(const sip_str_t *sb_val)
{
        sent_by_list_t  *sb;
        int             count = 0;

        (void) pthread_mutex_lock(&sip_sent_by_lock);
        if (sip_sent_by == NULL) {
                (void) pthread_mutex_unlock(&sip_sent_by_lock);
                return (B_TRUE);
        }
        sb = sip_sent_by;
        for (count = 0; count < sip_sent_by_count; count++) {
                if (strncasecmp(sb->sb_val, sb_val->sip_str_ptr,
                    sb_val->sip_str_len) == 0) {
                        (void) pthread_mutex_unlock(&sip_sent_by_lock);
                        return (B_TRUE);
                }
                sb = sb->sb_next;
        }
        (void) pthread_mutex_unlock(&sip_sent_by_lock);
        return (B_FALSE);
}

/*
 * Given a response, check if the sent-by in the VIA header is valid.
 */
boolean_t
sip_valid_sent_by(sip_msg_t sip_msg)
{
        sip_header_t            via;
        sip_header_value_t      value = NULL;
        int                     error;
        const sip_str_t         *sent_by = NULL;

        via = (sip_header_t)sip_get_header(sip_msg, SIP_VIA,  NULL, &error);
        if (via == NULL || error != 0)
                return (B_TRUE);
        value = (sip_header_value_t)sip_get_header_value(via, &error);
        if (value == NULL || error != 0)
                return (B_TRUE);
        sent_by = sip_get_via_sent_by_host(value, &error);
        if (sent_by == NULL || error != 0)
                return (B_TRUE);
        if (sip_sent_by_registered(sent_by))
                return (B_TRUE);
        return (B_FALSE);
}


/*
 * The receive interface to the transport layer.
 */
void
sip_process_new_packet(sip_conn_object_t conn_object, void *msgstr,
    size_t msglen)
{
        _sip_msg_t              *sip_msg;
        sip_message_type_t      *sip_msg_info;
        sip_xaction_t           *sip_trans;
        sip_dialog_t            dialog = NULL;
        boolean_t               dialog_created = B_FALSE;
        int                     transport;
        char                    *msgbuf = NULL;

        sip_refhold_conn(conn_object);
        transport = sip_conn_transport(conn_object);
        if (transport == IPPROTO_TCP) {
next_msg:
                msgstr = (char *)sip_get_tcp_msg(conn_object, (char *)msgstr,
                    &msglen);
                if (msgstr == NULL) {
                        sip_refrele_conn(conn_object);
                        return;
                }
        } else {
                msgbuf = (char *)malloc(msglen + 1);
                if (msgbuf == NULL) {
                        sip_refrele_conn(conn_object);
                        return;
                }
                (void) strncpy(msgbuf, msgstr, msglen);
                msgbuf[msglen] = '\0';
                msgstr = msgbuf;
        }
        sip_msg = (_sip_msg_t *)sip_new_msg();
        if (sip_msg == NULL) {
                if (msgbuf != NULL)
                        free(msgbuf);
                sip_refrele_conn(conn_object);
                return;
        }
        sip_msg->sip_msg_buf = (char *)msgstr;
        sip_msg->sip_msg_len = msglen;
        (void) pthread_mutex_lock(&sip_msg->sip_msg_mutex);
        if (sip_setup_header_pointers(sip_msg) != 0) {
                (void) pthread_mutex_unlock(&sip_msg->sip_msg_mutex);
                sip_refrele_conn(conn_object);
                sip_free_msg((sip_msg_t)sip_msg);
                return;
        }
        if (sip_parse_first_line(sip_msg->sip_msg_start_line,
            &sip_msg->sip_msg_req_res)) {
                (void) pthread_mutex_unlock(&sip_msg->sip_msg_mutex);
                sip_refrele_conn(conn_object);
                sip_free_msg((sip_msg_t)sip_msg);
                return;
        }
        sip_msg_info = sip_msg->sip_msg_req_res;
        (void) pthread_mutex_unlock(&sip_msg->sip_msg_mutex);

        if (sip_check_common_headers(conn_object, sip_msg)) {
                sip_refrele_conn(conn_object);
                sip_free_msg((sip_msg_t)sip_msg);
                return;
        }

        /*
         * Silently discard the response if the top VIA has a sent-by value AND
         * the UA has registered sent-by values AND the one in the VIA is
         * not part of the registerd sent-by values.
         */
        if (!sip_msg_info->is_request && !sip_valid_sent_by(sip_msg)) {
                sip_refrele_conn(conn_object);
                sip_free_msg((sip_msg_t)sip_msg);
                return;

        }
        sip_trans = (sip_xaction_t *)sip_xaction_get(conn_object,
            (sip_msg_t)sip_msg,
            B_FALSE, sip_msg_info->is_request ? SIP_SERVER_TRANSACTION :
            SIP_CLIENT_TRANSACTION, NULL);
        if (sip_trans != NULL) {
                if (sip_xaction_input(conn_object, sip_trans, &sip_msg) != 0) {
                        SIP_XACTION_REFCNT_DECR(sip_trans);
                        sip_refrele_conn(conn_object);
                        sip_free_msg((sip_msg_t)sip_msg);
                        return;
                }
                SIP_XACTION_REFCNT_DECR(sip_trans);

                /*
                 * msg was retransmission - handled by the transaction
                 */
                if (sip_msg == NULL)
                        goto check_next;
        } else {
                /*
                 * If we are getting an INVITE request, let us send a
                 * 100 TRYING response here, as in 17.2.1:
                 * "The server transaction MUST generate a 100 (Trying)
                 * response unless it knows that the TU will generate a
                 * provisional or final response within 200 ms".
                 */
                if (sip_msg_info->is_request &&
                    sip_msg_info->sip_req_method == INVITE) {
                        sip_send_resp(conn_object, sip_msg, SIP_TRYING);
                }
        }
        if (sip_manage_dialog) {
                dialog = sip_dialog_find(sip_msg);
                if (dialog == NULL) {
                        if (sip_msg_info->is_request) {
                                /*
                                 * sip_seed_dialog will check for the
                                 * method in the request
                                 */
                                dialog = (sip_dialog_t)sip_seed_dialog(
                                    conn_object, sip_msg,
                                    B_FALSE, SIP_UAS_DIALOG);
                                dialog_created = B_TRUE;
                        }
                } else if (sip_incomplete_dialog(dialog)) {
                        if (!sip_msg_info->is_request ||
                            sip_msg_info->sip_req_method == NOTIFY) {
                                dialog = sip_update_dialog(dialog, sip_msg);
                        }
                } else if (sip_dialog_process(sip_msg, &dialog) != 0) {
                        if (dialog != NULL)
                                sip_release_dialog(dialog);
                        /*
                         * cseq number in error, send a
                         * SIP_SERVER_INTERNAL_ERROR response.
                         */
                        if (sip_msg_info->is_request) {
                                sip_send_resp(conn_object, sip_msg,
                                    SIP_SERVER_INTERNAL_ERROR);
                        }
                        sip_refrele_conn(conn_object);
                        sip_free_msg((sip_msg_t)sip_msg);
                        return;
                }
        }
        if (sip_msg_info->is_request) {
                SIP_UPDATE_COUNTERS(B_TRUE, sip_msg_info->sip_req_method, 0,
                    B_FALSE, sip_msg->sip_msg_len);
        } else {
                SIP_UPDATE_COUNTERS(B_FALSE, 0, sip_msg_info->sip_resp_code,
                    B_FALSE, sip_msg->sip_msg_len);
        }
        sip_ulp_recv(conn_object, (sip_msg_t)sip_msg, dialog);
        sip_free_msg((sip_msg_t)sip_msg);
        if (dialog != NULL && !dialog_created)
                sip_release_dialog(dialog);
check_next:
        /*
         * Check if there are more complete messages in the TCP fragment list
         * to be consumed
         */
        if (transport == IPPROTO_TCP) {
                msgstr = NULL;
                msglen = 0;
                goto next_msg;
        }
        sip_refrele_conn(conn_object);
}

/*
 * Initialize the stack. The connection manager functions, upper layer
 * receive functions are mandatory.
 */
int
sip_stack_init(sip_stack_init_t *stack_val)
{
#ifdef  __linux__
        struct timespec tspec;
#endif

        /*
         * If the stack has already been configured, return error
         */
        if (sip_stack_send != NULL ||
            stack_val->sip_version != SIP_STACK_VERSION) {
                return (EINVAL);
        }
        if (stack_val->sip_io_pointers == NULL ||
            stack_val->sip_ulp_pointers == NULL) {
                return (EINVAL);
        }
        sip_ulp_recv = stack_val->sip_ulp_pointers->sip_ulp_recv;
        sip_manage_dialog = stack_val->sip_stack_flags & SIP_STACK_DIALOGS;

        sip_stack_send = stack_val->sip_io_pointers->sip_conn_send;
        sip_refhold_conn = stack_val->sip_io_pointers->sip_hold_conn_object;
        sip_refrele_conn = stack_val->sip_io_pointers->sip_rel_conn_object;
        sip_is_conn_stream = stack_val->sip_io_pointers->sip_conn_is_stream;
        sip_is_conn_reliable = stack_val->sip_io_pointers->sip_conn_is_reliable;
        sip_conn_rem_addr = stack_val->sip_io_pointers->sip_conn_remote_address;
        sip_conn_local_addr =
            stack_val->sip_io_pointers->sip_conn_local_address;
        sip_conn_transport = stack_val->sip_io_pointers->sip_conn_transport;
        sip_header_function_table_external = stack_val->sip_function_table;

        if (sip_ulp_recv == NULL || sip_stack_send == NULL ||
            sip_refhold_conn == NULL || sip_refrele_conn == NULL ||
            sip_is_conn_stream == NULL || sip_is_conn_reliable == NULL ||
            sip_conn_rem_addr == NULL || sip_conn_local_addr == NULL ||
            sip_conn_transport == NULL) {
        err_ret:
                sip_ulp_recv = NULL;
                sip_stack_send = NULL;
                sip_refhold_conn = NULL;
                sip_refrele_conn = NULL;
                sip_is_conn_stream = NULL;
                sip_is_conn_reliable = NULL;
                sip_conn_rem_addr = NULL;
                sip_conn_local_addr = NULL;
                sip_conn_transport = NULL;
                sip_header_function_table_external = NULL;
                sip_stack_timeout = NULL;
                sip_stack_untimeout = NULL;
                return (EINVAL);
        }

        sip_conn_timer1 = stack_val->sip_io_pointers->sip_conn_timer1;
        sip_conn_timer2 = stack_val->sip_io_pointers->sip_conn_timer2;
        sip_conn_timer4 = stack_val->sip_io_pointers->sip_conn_timer4;
        sip_conn_timerd = stack_val->sip_io_pointers->sip_conn_timerd;

        /*
         * Use Appln timeout routines, if provided
         */
        if (stack_val->sip_ulp_pointers->sip_ulp_timeout != NULL) {
                if (stack_val->sip_ulp_pointers->sip_ulp_untimeout == NULL)
                        goto err_ret;
                sip_stack_timeout =
                    stack_val->sip_ulp_pointers->sip_ulp_timeout;
                sip_stack_untimeout =
                    stack_val->sip_ulp_pointers->sip_ulp_untimeout;
        } else {
                if (stack_val->sip_ulp_pointers->sip_ulp_untimeout != NULL)
                        goto err_ret;
                sip_timeout_init();
                sip_stack_timeout = sip_timeout;
                sip_stack_untimeout = sip_untimeout;
        }

        /*
         * Manage Dialogs?
         */
        if (sip_manage_dialog) {
                sip_dialog_init(stack_val->sip_ulp_pointers->sip_ulp_dlg_del,
                    stack_val->sip_ulp_pointers->sip_ulp_dlg_state_cb);
        }
        sip_xaction_init(stack_val->sip_ulp_pointers->sip_ulp_trans_error,
            stack_val->sip_ulp_pointers->sip_ulp_trans_state_cb);

        /*
         * Initialize SIP traffic counter mutex
         */
        (void) pthread_mutex_init(&sip_counters.sip_counter_mutex, NULL);

        /*
         * Initialize SIP logfile structures mutex
         */
        (void) pthread_mutex_init(&trans_log.sip_logfile_mutex, NULL);
        (void) pthread_mutex_init(&dialog_log.sip_logfile_mutex, NULL);

#ifdef  __linux__
        if (clock_gettime(CLOCK_REALTIME, &tspec) != 0)
                goto err_ret;
        sip_hash_salt = tspec.tv_nsec;
#else
        sip_hash_salt = gethrtime();
#endif
        (void) pthread_mutex_init(&sip_sent_by_lock, NULL);
        return (0);
}