For historica researchy

FossilOrigin-Name: f7c8a2881ee16fc3465419e27c75b8a12bd7eddd75dc79e673c96ed825c81c9f
This commit is contained in:
7u83@mail.ru 2018-04-01 16:33:45 +00:00
parent d04e106dcd
commit c038599910
2 changed files with 903 additions and 0 deletions

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src/ac/old_wtpman.c Normal file
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/*
This file is part of actube.
actube 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 3 of the License, or
(at your option) any later version.
libcapwap 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 Foobar. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h> // sleep
#include "cw/capwap.h"
#include "cw/sock.h"
#include "cw/log.h"
#include "cw/timer.h"
#include "cw/cw.h"
#include "cw/dtls.h"
#include "cw/dbg.h"
#include "cw/conn.h"
#include "cw/format.h"
#include "ac.h"
#include "conf.h"
#include "db.h"
#include "socklist.h"
#include "wtpman.h"
#include "wtplist.h"
#include "cw/ktv.h"
static void reset_echointerval_timer(struct wtpman *wtpman)
{
char sock_buf[SOCK_ADDR_BUFSIZE];
/* uint16_t ct = mbag_get_word(wtpman->conn->local, CW_ITEM_CAPWAP_TIMERS,
CW_MAX_DISCOVERY_INTERVAL << 8 |
CAPWAP_ECHO_INTERVAL);
*/
/* start echinterval timer and put 2 seconds for "safety" on it */
/*
// wtpman->echointerval_timer = cw_timer_start(2+ (ct & 0xff));
// db_ping_wtp(sock_addr2str_p(&wtpman->conn->addr,sock_buf), conf_acname);
// cw_dbg(DBG_X, "Starting capwap timer: %d", wtpman->echointerval_timer);
*/
}
static int msg_start_handler(struct conn *conn, struct cw_action_in *a, uint8_t * data,
int len, struct sockaddr *from)
{
struct wtpman *wtpman = conn->data;
reset_echointerval_timer(wtpman);
return 0;
}
static void wtpman_remove(struct wtpman *wtpman)
{
wtplist_lock();
wtplist_remove(wtpman);
wtplist_unlock();
wtpman_destroy(wtpman);
}
static void wtpman_run_discovery(void *arg)
{
struct wtpman *wtpman = (struct wtpman *) arg;
time_t timer = cw_timer_start(10);
wtpman->conn->capwap_state = CAPWAP_STATE_DISCOVERY;
/*// wtpman->conn->actions = &capwap_actions;*/
/* wtpman->conn->outgoing = mbag_create();
wtpman->conn->incomming = mbag_create();
*/
wtpman->conn->remote_cfg = cw_ktv_create(); /*//mavl_cmp_kv,NULL,1312);*/
while (!cw_timer_timeout(timer)
&& wtpman->conn->capwap_state == CAPWAP_STATE_DISCOVERY) {
cw_read_messages(wtpman->conn);
}
/*
// struct mbag_item *wn = mbag_get(wtpman->conn->incomming, CW_ITEM_WTP_NAME);
// if (wn) {
// printf("WTP Name: %s\n", wn->data);
// exit(0);
// }
*/
wtpman_remove(wtpman);
return;
}
int xprocess_message(struct conn *conn, uint8_t * rawmsg, int rawlen,
struct sockaddr *from)
{
uint8_t *msgptr = rawmsg + cw_get_hdr_msg_offset(rawmsg);
uint32_t type = cw_get_msg_type(msgptr);
cw_log(LOG_ERR, "Hey: %d", type);
if (type == CAPWAP_MSG_DISCOVERY_REQUEST)
conn->capwap_state = CAPWAP_STATE_DISCOVERY;
return process_message(conn, rawmsg, rawlen, from);
}
static int wtpman_establish_dtls(void *arg)
{
char sock_buf[SOCK_ADDR_BUFSIZE];
struct wtpman *wtpman = (struct wtpman *) arg;
/* setup cipher */
wtpman->conn->dtls_cipher = conf_sslcipher;
/* setup DTSL certificates */
int dtls_ok = 0;
if (conf_sslkeyfilename && conf_sslcertfilename) {
wtpman->conn->dtls_key_file = conf_sslkeyfilename;
wtpman->conn->dtls_cert_file = conf_sslcertfilename;
wtpman->conn->dtls_key_pass = conf_sslkeypass;
wtpman->conn->dtls_verify_peer = conf_dtls_verify_peer;
cw_dbg(DBG_DTLS, "Using key file %s", wtpman->conn->dtls_key_file);
cw_dbg(DBG_DTLS, "Using cert file %s", wtpman->conn->dtls_cert_file);
dtls_ok = 1;
}
/* setup DTLS psk */
if (conf_dtls_psk) {
wtpman->conn->dtls_psk = conf_dtls_psk;
wtpman->conn->dtls_psk_len = strlen(conf_dtls_psk);
dtls_ok = 1;
}
if (!dtls_ok) {
cw_log(LOG_ERR,
"Can't establish DTLS session, neither psk nor certs set in config file.");
return 0;
}
/* try to accept the connection */
if (!dtls_accept(wtpman->conn)) {
cw_dbg(DBG_DTLS, "Error establishing DTLS session with %s",
sock_addr2str_p(&wtpman->conn->addr,sock_buf));
return 0;
}
cw_dbg(DBG_DTLS, "DTLS session established with %s, cipher=%s",
sock_addr2str_p(&wtpman->conn->addr,sock_buf), dtls_get_cipher(wtpman->conn));
return 1;
}
static int wtpman_join(void *arg, time_t timer)
{
char sock_buf[SOCK_ADDR_BUFSIZE];
struct wtpman *wtpman = (struct wtpman *) arg;
struct conn *conn = wtpman->conn;
/*
// wtpman->conn->outgoing = mbag_create();
// wtpman->conn->incomming = mbag_create();
// conn->config = conn->incomming;
// wtpman->conn->local = ac_config;
// mbag_set_str(conn->local, CW_ITEM_AC_NAME, conf_acname);
*/
wtpman->conn->capwap_state = CAPWAP_STATE_JOIN;
/*
// wtpman->conn->actions = &capwap_actions;
// wtpman->conn->itemstore = mbag_create();
*/
cw_dbg(DBG_INFO, "Join State - %s", sock_addr2str(&conn->addr,sock_buf));
int rc;
while (!cw_timer_timeout(timer) && wtpman->conn->capwap_state == CAPWAP_STATE_JOIN) {
rc = cw_read_messages(wtpman->conn);
if (rc < 0) {
break;
}
}
if (rc != 0) {
cw_log(LOG_ERR, "Error joining WTP %s", cw_strerror(rc));
return 0;
}
if (wtpman->conn->capwap_state == CAPWAP_STATE_JOIN) {
cw_dbg(DBG_MSG_ERR, "No join request from %s after %d seconds, WTP died.",
sock_addr2str(&wtpman->conn->addr,sock_buf), wtpman->conn->wait_dtls);
return 0;
}
return 1;
}
static void wtpman_image_data(struct wtpman *wtpman)
{
/* char sock_buf[SOCK_ADDR_BUFSIZE];
struct conn *conn = wtpman->conn;
// Image upload
const char *filename = mbag_get_str(conn->outgoing, CW_ITEM_IMAGE_FILENAME, NULL);
if (!filename) {
cw_log(LOG_ERR,
"Can't send image to %s. No Image Filename Item found.",
sock_addr2str(&conn->addr,sock_buf));
return;
}
cw_dbg(DBG_INFO, "Sending image file '%s' to '%s'.", filename,
sock_addr2str(&conn->addr,sock_buf));
FILE *infile = fopen(filename, "rb");
if (infile == NULL) {
cw_log(LOG_ERR, "Can't open image %s: %s",
sock_addr2str(&conn->addr,sock_buf), strerror(errno));
return;
}
CW_CLOCK_DEFINE(clk);
cw_clock_start(&clk);
mbag_item_t *eof = mbag_set_const_ptr(conn->outgoing, CW_ITEM_IMAGE_FILEHANDLE,
infile);
int rc = 0;
while (conn->capwap_state == CW_STATE_IMAGE_DATA && rc == 0 && eof != NULL) {
rc = cw_send_request(conn, CAPWAP_MSG_IMAGE_DATA_REQUEST);
eof = mbag_get(conn->outgoing, CW_ITEM_IMAGE_FILEHANDLE);
}
if (rc) {
cw_log(LOG_ERR, "Error sending image to %s: %s",
sock_addr2str(&conn->addr,sock_buf), cw_strrc(rc));
} else {
cw_dbg(DBG_INFO, "Image '%s' sucessful sent to %s in %0.1f seconds.",
filename, sock_addr2str(&conn->addr,sock_buf), cw_clock_stop(&clk));
conn->capwap_state = CW_STATE_NONE;
}
fclose(infile);
wtpman_remove(wtpman);
*/
}
void config_to_sql(struct conn *conn)
{
/*
// XXX for the moment we use just the IP adress as ID
char *wtp_id = sock_addr2str(&conn->addr);
// cw_dbg(DBG_X, "WTPID: %s\n", wtp_id);
MAVLITER_DEFINE(it, conn->incomming);
mavliter_foreach(&it) {
mbag_item_t *i = mavliter_get(&it);
const struct cw_itemdef *cwi =
cw_itemdef_get(conn->actions->items, i->id, NULL);
cw_dbg(DBG_X,"ID GOT: %s",i->id);
if (cwi) {
DBGX("SQL ID %s,%s", i->id, cwi->id);
DBGX("SQL Type %s,Typecwd %s", i->type->name, cwi->type->name);
// printf("%s != %s ?\n",i->type->name,cwi->type->name);
char str[256];
if (i->type->to_str) {
i->type->to_str(i, str);
db_put_wtp_prop(wtp_id, cwi->id, cwi->sub_id, str);
} else {
cw_log(LOG_ERR, "Can't converto to str for %s", cwi->id,
cwi->sub_id);
}
} else {
// DBGX("ID %d",i->id);
}
}
*/
}
void xradio_to_sql(struct conn *conn, char *wtp_id, int rid, int radio)
{
/*
MAVLITER_DEFINE(it, radio);
mavliter_foreach(&it) {
mbag_item_t *i = mavliter_get(&it);
const struct cw_itemdef *cwi =
cw_itemdef_get(conn->actions->radioitems, i->id, NULL);
if (cwi) {
char str[4096];
if (i->type->to_str) {
i->type->to_str(i, str);
// printf("I would put RID: %d, %s=>%s\n",rid,cwi->id,str);
char srid[6];
sprintf(srid,"%d",rid);
db_put_radio_prop(wtp_id,srid,cwi->id,cwi->sub_id,str);
// db_put_wtp_prop(wtp_id, cwi->id, cwi->sub_id, str);
} else {
cw_log(LOG_ERR, "Can't converto to str for %s", cwi->id,
cwi->sub_id);
}
} else {
// DBGX("ID %d",i->id);
}
}
// int rid = ((struct mbag_item*)mavliter_get(&it))->iid;
*/
}
/*
void radios_to_sql(struct conn *conn)
{
char sock_buf[SOCK_ADDR_BUFSIZE];
char *wtp_id = sock_addr2str(&conn->addr,sock_buf);
MAVLITER_DEFINE(it, conn->radios);
mavliter_foreach(&it) {
struct mbag_item * i = mavliter_get(&it);
int rid = i->u1.iid;
radio_to_sql(conn,wtp_id,rid,i->u2.data);
}
}
*/
void wtpman_run_data(void *wtpman_arg)
{
return;
struct wtpman *wtpman = (struct wtpman *) wtpman_arg;
struct conn *conn = wtpman->conn;
uint8_t data[1001];
memset(data, 0, 1000);
cw_log(LOG_ERR, "I am the data thread**********************************************************************\n");
while (1) {
sleep(5);
/*// conn->write_data(conn, data, 100);*/
cw_log(LOG_ERR, "O was the data thread***********************************************************\n");
}
}
static int msg_end_handler(struct conn *conn, struct cw_action_in *a, uint8_t * data,
int len, struct sockaddr *from)
{
/* if (a->msg_id ==CAPWAP_MSG_CHANGE_STATE_EVENT_REQUEST) {
props_to_sql(conn,conn->incomming,0);
radios_to_sql(conn);
}
*/
}
static void wtpman_run(void *arg)
{
char sock_buf[SOCK_ADDR_BUFSIZE];
struct wtpman *wtpman = (struct wtpman *) arg;
wtpman->conn->seqnum = 0;
struct conn *conn = wtpman->conn;
/* reject connections to our multi- or broadcast sockets */
/* if (socklist[wtpman->socklistindex].type != SOCKLIST_UNICAST_SOCKET) {
cw_dbg(DBG_DTLS, "Dropping connection from %s to non-unicast socket.",
CLIENT_IP);
wtpman_remove(wtpman);
return;
}
*/
time_t timer = cw_timer_start(wtpman->conn->wait_dtls);
/* establish dtls session */
/* if (!wtpman_establish_dtls(wtpman)) {
wtpman_remove(wtpman);
return;
}
*/
/* dtls is established, goto join state */
if (!wtpman_join(wtpman, timer)) {
wtpman_remove(wtpman);
return;
}
conn->msg_start = msg_start_handler;
cw_dbg(DBG_INFO, "WTP from %s has joined with session id: %s",
sock_addr2str_p(&conn->addr,sock_buf),
format_bin2hex(conn->session_id,16));
/*
// cw_dbg(DBG_INFO, "Creating data thread");
// pthread_t thread;
// pthread_create(&thread, NULL, (void *) wtpman_run_data, (void *) wtpman);
*/
/* here the WTP has joined, now we assume an image data request
or an configuration status request. Nothing else.
*/
int rc = 0;
while (!cw_timer_timeout(timer)
&& wtpman->conn->capwap_state == CW_STATE_CONFIGURE) {
rc = cw_read_messages(wtpman->conn);
if (rc < 0) {
if (errno != EAGAIN)
break;
}
}
if (!cw_result_is_ok(rc)) {
cw_dbg(DBG_INFO, "WTP Problem: %s", cw_strrc(rc));
wtpman_remove(wtpman);
return;
}
if (conn->capwap_state == CW_STATE_IMAGE_DATA) {
wtpman_image_data(wtpman);
return;
}
conn->capwap_state = CW_STATE_RUN;
/*
// XXX testing ...
// DBGX("Cofig to sql", "");
// props_to_sql(conn,conn->incomming,0);
// radios_to_sql(conn);
*/
conn->msg_end=msg_end_handler;
/* The main run loop */
reset_echointerval_timer(wtpman);
rc = 0;
while (wtpman->conn->capwap_state == CW_STATE_RUN) {
rc = cw_read_messages(wtpman->conn);
if (rc < 0) {
if (errno != EAGAIN)
break;
}
/*// cw_dbg(DBG_X, "Time left: %d",
//*/
cw_timer_timeleft(wtpman->echointerval_timer);
if (cw_timer_timeout(wtpman->echointerval_timer)) {
cw_dbg(DBG_INFO, "Lost connection to WTP:%s",
sock_addr2str_p(&conn->addr,sock_buf));
break;
}
/*
// mavl_del_all(conn->outgoing);
// conn_clear_upd(conn,1);
// props_to_sql(conn,conn->incomming,0);
// radios_to_sql(conn);
*/
mavl_t r;
r = db_get_update_tasks(conn, sock_addr2str(&conn->addr,sock_buf));
if (r) {
/*
// if (!conn->outgoing->count)
// continue;
*/
cw_dbg(DBG_INFO, "Updating WTP %s",sock_addr2str(&conn->addr,sock_buf));
rc = cw_send_request(conn, CAPWAP_MSG_CONFIGURATION_UPDATE_REQUEST);
/*
// mavl_merge(conn->config, conn->outgoing);
// mavl_destroy(conn->outgoing);
// conn->outgoing = mbag_create();
// props_to_sql(conn,conn->incomming,0);
// radios_to_sql(conn);
// mavl_destroy(r);
*/
}
r = db_get_radio_tasks(conn, sock_addr2str(&conn->addr,sock_buf));
if (r) {
/*
// if (!conn->radios_upd->count)
// continue;
*/
cw_dbg(DBG_INFO, "Updating Radios for %s",sock_addr2str(&conn->addr,sock_buf));
rc = cw_send_request(conn, CAPWAP_MSG_CONFIGURATION_UPDATE_REQUEST);
/*
// conn_clear_upd(conn,1);
// mavl_destroy(conn->radios_upd);
// conn->radios_upd=mbag_i_create();
// radios_to_sql(conn);
*/
/*
rc = cw_send_request(conn, CW_MSG_CONFIGURATION_UPDATE_REQUEST);
mavl_merge(conn->config, conn->outgoing);
mavl_destroy(conn->outgoing);
conn->outgoing = mbag_create();
config_to_sql(conn);
radios_to_sql(conn);
mavl_destroy(r);
*/
}
}
db_ping_wtp(sock_addr2str_p(&conn->addr,sock_buf), "");
wtpman_remove(wtpman);
return;
}
static void wtpman_run_dtls(void *arg)
{
char sock_buf[SOCK_ADDR_BUFSIZE];
struct wtpman *wtpman = (struct wtpman *) arg;
/* reject connections to our multi- or broadcast sockets */
if (socklist[wtpman->socklistindex].type != SOCKLIST_UNICAST_SOCKET) {
cw_dbg(DBG_DTLS, "Dropping connection from %s to non-unicast socket.",
sock_addr2str_p(&wtpman->conn->addr,sock_buf));
wtpman_remove(wtpman);
return;
}
/*// time_t timer = cw_timer_start(wtpman->conn->wait_dtls);*/
/* establish dtls session */
if (!wtpman_establish_dtls(wtpman)) {
wtpman_remove(wtpman);
return;
}
wtpman_run(arg);
}
void wtpman_destroy(struct wtpman *wtpman)
{
if (wtpman->conn)
conn_destroy(wtpman->conn);
free(wtpman);
}
struct wtpman *wtpman_create(int socklistindex, struct sockaddr *srcaddr)
{
char sock_buf[SOCK_ADDR_BUFSIZE];
struct wtpman *wtpman;
wtpman = malloc(sizeof(struct wtpman));
if (!wtpman)
return 0;
memset(wtpman, 0, sizeof(struct wtpman));
int replyfd;
if (socklist[socklistindex].type != SOCKLIST_UNICAST_SOCKET) {
int port = sock_getport(&socklist[socklistindex].addr);
replyfd = socklist_find_reply_socket(srcaddr, port);
if (replyfd == -1) {
cw_log(LOG_ERR, "Can't find reply socket for request from %s",
sock_addr2str(srcaddr,sock_buf));
free(wtpman);
return NULL;
}
} else {
replyfd = socklist[socklistindex].sockfd;
}
int sockfd = replyfd; /*//socklist[socklistindex].reply_sockfd;
*/
struct sockaddr dbgaddr;
socklen_t dbgaddrl = sizeof(dbgaddr);
getsockname(sockfd, &dbgaddr, &dbgaddrl);
cw_dbg(DBG_INFO, "Creating wtpman on socket %d, %s:%d", sockfd,
sock_addr2str(&dbgaddr,sock_buf), sock_getport(&dbgaddr));
/*
//extern int conn_process_packet2(struct conn *conn, uint8_t * packet, int len,
// struct sockaddr *from);
*/
wtpman->conn = conn_create(sockfd, srcaddr, 100);
wtpman->conn->role = CW_ROLE_AC;
wtpman->conn->data_sock = socklist[socklistindex].data_sockfd;
sock_copyaddr(&wtpman->conn->data_addr, (struct sockaddr *) &wtpman->conn->addr);
/*
// wtpman->conn->process_packet = conn_process_packet2;
*/
if (!wtpman->conn) {
wtpman_destroy(wtpman);
return NULL;
}
wtpman->conn->mods = conf_mods;
wtpman->conn->strict_capwap = conf_strict_capwap;
wtpman->conn->strict_hdr = conf_strict_headers;
/*
// wtpman->conn->radios = mbag_i_create();
// wtpman->conn->radios_upd = mbag_i_create();
// wtpman->conn->local = ac_config;
//wtpman->conn->capwap_mode=0; //CW_MODE_STD; //CISCO;
// wtpman->conn->capwap_mode = CW_MODE_CISCO;
//wtpman->conn->strict_capwap_hdr=0;
*/
wtpman->conn->local_cfg = cw_ktv_create();
wtpman->conn->global_cfg = actube_global_cfg;
wtpman->conn->local_cfg = actube_global_cfg;
return wtpman;
}
void wtpman_addpacket(struct wtpman *wtpman, uint8_t * packet, int len)
{
conn_q_add_packet(wtpman->conn, packet, len);
}
int nodtls = 0;
void wtpman_start(struct wtpman *wtpman, int dtlsmode)
{
if (dtlsmode) {
cw_dbg(DBG_INFO, "Starting wtpman in DTLS mode");
pthread_create(&wtpman->thread, NULL, (void *) wtpman_run_dtls,
(void *) wtpman);
} else {
cw_dbg(DBG_INFO, "Starting wtpman in non-dtls mode");
if (nodtls) {
wtpman->conn->process_message = xprocess_message;
pthread_create(&wtpman->thread, NULL, (void *) wtpman_run,
(void *) wtpman);
return;
}
pthread_create(&wtpman->thread, NULL, (void *) wtpman_run_discovery,
(void *) wtpman);
}
}
void wtpman_lw_addpacket(struct wtpman *wtpman, uint8_t * packet, int len)
{
/*
// uint8_t * m = packet+12;
// int l = LWTH_GET_LENGTH(packet+6);
*/
uint8_t *msg = packet + 12;
int msgtype = LWMSG_GET_TYPE(msg);
int msglen = LWMSG_GET_LEN(msg);
printf("Type is %d, Len is %d\n", msgtype, msglen);
/*
// uint8_t *msgdata = LWMSG_GET_DATA(msg);
*/
/*
int c=0;
while (c < msglen){
int eltype = LWMSGELEM_GET_TYPE(data);
int ellen = LWMSGELEM_GET_LEN(data);
printf ("ELEM TYPE: %d, LEN: %d\n",eltype,ellen);
c+=ellen+3;
data=data+ellen+3;
}
*/
/*//uint8_t *data;*/
/*
lw_foreach_msgelem(data,msgdata,msglen){
int eltype = LWMSGELEM_GET_TYPE(data);
int ellen = LWMSGELEM_GET_LEN(data);
uint8_t * eldata = LWMSGELEM_GET_DATA(data);
wtpinfo_lwreadelem_wtp_descriptor(&wtpman->wtpinfo,eltype,eldata,ellen);
printf ("ELEM TYPE: %d, LEN: %d\n",eltype,ellen);
}
*/
/*
// char wi[4096];
// wtpinfo_print(wi, &wtpman->wtpinfo);
// printf("WTPINFO: \n%s\n", wi);
// char buffer[2048];
// struct lwmsg lwmsg;
// lwmsg_init(&lwmsg, buffer,conf_macaddress,LWMSG_DISCOVERY_RESPONSE,conn_get_next_seqnum(wtpman->conn));
// conn_send_packet(wtpman->conn,buffer,60);
*/
}
/*
void wtpman_lw_start(struct wtpman *wtpman)
{
}
*/

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#ifndef __WTPMAN_H
#define __WTPMAN_H
#include <sys/socket.h>
#include <semaphore.h>
#include <pthread.h>
#include "cw/capwap.h"
#include "cw/fragman.h"
#include "cw/timer.h"
#define WTPMAN_QSIZE 1024
struct wtpman{
pthread_t thread;
/* packet queue */
/* uint8_t * q[WTPMAN_QSIZE];
int qrpos;
int qwpos;
sem_t q_sem;
*/
struct conn * conn;
/* wtp data */
uint8_t * wtp_name;
uint8_t * wtp_location;
uint8_t * session_id;
uint8_t wtp_mactype;
/* //struct wtpinfo wtpinfo;*/
int socklistindex;
int connected;
cw_timer_t echointerval_timer;
};
/*
struct wtp{
};
//extern void wtpman_run(void *arg);
*/
extern struct wtpman * wtpman_create();
extern struct wtpman * wtpman_create(int socklistindex,struct sockaddr * srcaddr);
extern void wtpman_addpacket(struct wtpman * wtpman,uint8_t *packet,int len);
extern void wtpman_destroy(struct wtpman * wtpman);
extern void wtpman_start(struct wtpman * wtpman,int dtlsmode);
#endif