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nodemcu-firmware/app/modules/tls.c

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// Module for TLS
#include "module.h"
#if defined(CLIENT_SSL_ENABLE) && defined(LUA_USE_MODULES_NET)
#include "lauxlib.h"
#include "platform.h"
#include "lmem.h"
#include "c_string.h"
#include "c_stdlib.h"
#include "c_types.h"
#include "mem.h"
#include "lwip/ip_addr.h"
#include "espconn.h"
#include "lwip/err.h"
#include "lwip/dns.h"
#ifdef HAVE_SSL_SERVER_CRT
#include HAVE_SSL_SERVER_CRT
#else
__attribute__((section(".servercert.flash"))) unsigned char tls_server_cert_area[INTERNAL_FLASH_SECTOR_SIZE];
#endif
__attribute__((section(".clientcert.flash"))) unsigned char tls_client_cert_area[INTERNAL_FLASH_SECTOR_SIZE];
extern int tls_socket_create( lua_State *L );
extern const LUA_REG_TYPE tls_cert_map[];
typedef struct {
struct espconn *pesp_conn;
int self_ref;
int cb_connect_ref;
int cb_reconnect_ref;
int cb_disconnect_ref;
int cb_sent_ref;
int cb_receive_ref;
int cb_dns_ref;
} tls_socket_ud;
int tls_socket_create( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud*) lua_newuserdata(L, sizeof(tls_socket_ud));
ud->pesp_conn = NULL;
ud->self_ref =
ud->cb_connect_ref =
ud->cb_reconnect_ref =
ud->cb_disconnect_ref =
ud->cb_sent_ref =
ud->cb_receive_ref =
ud->cb_dns_ref = LUA_NOREF;
luaL_getmetatable(L, "tls.socket");
lua_setmetatable(L, -2);
return 1;
}
static void tls_socket_onconnect( struct espconn *pesp_conn ) {
tls_socket_ud *ud = (tls_socket_ud *)pesp_conn->reverse;
if (!ud || ud->self_ref == LUA_NOREF) return;
if (ud->cb_connect_ref != LUA_NOREF) {
lua_State *L = lua_getstate();
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->cb_connect_ref);
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->self_ref);
lua_call(L, 1, 0);
}
}
static void tls_socket_cleanup(tls_socket_ud *ud) {
if (ud->pesp_conn) {
espconn_secure_disconnect(ud->pesp_conn);
if (ud->pesp_conn->proto.tcp) {
c_free(ud->pesp_conn->proto.tcp);
ud->pesp_conn->proto.tcp = NULL;
}
c_free(ud->pesp_conn);
ud->pesp_conn = NULL;
}
lua_State *L = lua_getstate();
lua_gc(L, LUA_GCSTOP, 0);
luaL_unref(L, LUA_REGISTRYINDEX, ud->self_ref);
ud->self_ref = LUA_NOREF;
lua_gc(L, LUA_GCRESTART, 0);
}
static void tls_socket_ondisconnect( struct espconn *pesp_conn ) {
tls_socket_ud *ud = (tls_socket_ud *)pesp_conn->reverse;
if (!ud || ud->self_ref == LUA_NOREF) return;
tls_socket_cleanup(ud);
if (ud->cb_disconnect_ref != LUA_NOREF) {
lua_State *L = lua_getstate();
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->cb_disconnect_ref);
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->self_ref);
tls_socket_cleanup(ud);
lua_call(L, 1, 0);
} else tls_socket_cleanup(ud);
}
static void tls_socket_onreconnect( struct espconn *pesp_conn, s8 err ) {
tls_socket_ud *ud = (tls_socket_ud *)pesp_conn->reverse;
if (!ud || ud->self_ref == LUA_NOREF) return;
if (ud->cb_reconnect_ref != LUA_NOREF) {
const char* reason = NULL;
switch (err) {
case(ESPCONN_MEM): reason = "Out of memory"; break;
case(ESPCONN_TIMEOUT): reason = "Timeout"; break;
case(ESPCONN_RTE): reason = "Routing problem"; break;
case(ESPCONN_ABRT): reason = "Connection aborted"; break;
case(ESPCONN_RST): reason = "Connection reset"; break;
case(ESPCONN_CLSD): reason = "Connection closed"; break;
case(ESPCONN_HANDSHAKE): reason = "SSL handshake failed"; break;
case(ESPCONN_SSL_INVALID_DATA): reason = "SSL application invalid"; break;
}
lua_State *L = lua_getstate();
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->cb_reconnect_ref);
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->self_ref);
if (reason != NULL) {
lua_pushstring(L, reason);
} else {
lua_pushnil(L);
}
tls_socket_cleanup(ud);
lua_call(L, 2, 0);
} else tls_socket_cleanup(ud);
}
static void tls_socket_onrecv( struct espconn *pesp_conn, char *buf, u16 length ) {
tls_socket_ud *ud = (tls_socket_ud *)pesp_conn->reverse;
if (!ud || ud->self_ref == LUA_NOREF) return;
if (ud->cb_receive_ref != LUA_NOREF) {
lua_State *L = lua_getstate();
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->cb_receive_ref);
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->self_ref);
lua_pushlstring(L, buf, length);
lua_call(L, 2, 0);
}
}
static void tls_socket_onsent( struct espconn *pesp_conn ) {
tls_socket_ud *ud = (tls_socket_ud *)pesp_conn->reverse;
if (!ud || ud->self_ref == LUA_NOREF) return;
if (ud->cb_sent_ref != LUA_NOREF) {
lua_State *L = lua_getstate();
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->cb_sent_ref);
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->self_ref);
lua_call(L, 1, 0);
}
}
static void tls_socket_dns_cb( const char* domain, const ip_addr_t *ip_addr, tls_socket_ud *ud ) {
if (ud->self_ref == LUA_NOREF) return;
ip_addr_t addr;
if (ip_addr) addr = *ip_addr;
else addr.addr = 0xFFFFFFFF;
lua_State *L = lua_getstate();
if (ud->cb_dns_ref != LUA_NOREF) {
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->cb_dns_ref);
lua_rawgeti(L, LUA_REGISTRYINDEX, ud->self_ref);
if (addr.addr == 0xFFFFFFFF) {
lua_pushnil(L);
} else {
char tmp[20];
c_sprintf(tmp, IPSTR, IP2STR(&addr.addr));
lua_pushstring(L, tmp);
}
lua_call(L, 2, 0);
}
if (addr.addr == 0xFFFFFFFF) {
lua_gc(L, LUA_GCSTOP, 0);
luaL_unref(L, LUA_REGISTRYINDEX, ud->self_ref);
ud->self_ref = LUA_NOREF;
lua_gc(L, LUA_GCRESTART, 0);
} else {
os_memcpy(ud->pesp_conn->proto.tcp->remote_ip, &addr.addr, 4);
espconn_secure_connect(ud->pesp_conn);
}
}
static int tls_socket_connect( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
if (ud->pesp_conn) {
return luaL_error(L, "already connected");
}
u16 port = luaL_checkinteger( L, 2 );
size_t il;
const char *domain = "127.0.0.1";
if( lua_isstring(L, 3) )
domain = luaL_checklstring( L, 3, &il );
if (port == 0)
return luaL_error(L, "invalid port");
if (domain == NULL)
return luaL_error(L, "invalid domain");
ud->pesp_conn = (struct espconn*)c_zalloc(sizeof(struct espconn));
if(!ud->pesp_conn)
return luaL_error(L, "not enough memory");
ud->pesp_conn->proto.udp = NULL;
ud->pesp_conn->proto.tcp = (esp_tcp *)c_zalloc(sizeof(esp_tcp));
if(!ud->pesp_conn->proto.tcp){
c_free(ud->pesp_conn);
ud->pesp_conn = NULL;
return luaL_error(L, "not enough memory");
}
ud->pesp_conn->type = ESPCONN_TCP;
ud->pesp_conn->state = ESPCONN_NONE;
ud->pesp_conn->reverse = ud;
ud->pesp_conn->proto.tcp->remote_port = port;
espconn_regist_connectcb(ud->pesp_conn, (espconn_connect_callback)tls_socket_onconnect);
espconn_regist_disconcb(ud->pesp_conn, (espconn_connect_callback)tls_socket_ondisconnect);
espconn_regist_reconcb(ud->pesp_conn, (espconn_reconnect_callback)tls_socket_onreconnect);
espconn_regist_recvcb(ud->pesp_conn, (espconn_recv_callback)tls_socket_onrecv);
espconn_regist_sentcb(ud->pesp_conn, (espconn_sent_callback)tls_socket_onsent);
if (ud->self_ref == LUA_NOREF) {
lua_pushvalue(L, 1); // copy to the top of stack
ud->self_ref = luaL_ref(L, LUA_REGISTRYINDEX);
}
ip_addr_t addr;
err_t err = dns_gethostbyname(domain, &addr, (dns_found_callback)tls_socket_dns_cb, ud);
if (err == ERR_OK) {
tls_socket_dns_cb(domain, &addr, ud);
} else if (err != ERR_INPROGRESS) {
tls_socket_dns_cb(domain, NULL, ud);
}
return 0;
}
static int tls_socket_on( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
size_t sl;
const char *method = luaL_checklstring( L, 2, &sl );
if (method == NULL)
return luaL_error( L, "wrong arg type" );
luaL_checkanyfunction(L, 3);
lua_pushvalue(L, 3); // copy argument (func) to the top of stack
if (strcmp(method, "connection") == 0) {
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_connect_ref);
ud->cb_connect_ref = luaL_ref(L, LUA_REGISTRYINDEX);
} else if (strcmp(method, "disconnection") == 0) {
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_disconnect_ref);
ud->cb_disconnect_ref = luaL_ref(L, LUA_REGISTRYINDEX);
} else if (strcmp(method, "reconnection") == 0) {
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_reconnect_ref);
ud->cb_reconnect_ref = luaL_ref(L, LUA_REGISTRYINDEX);
} else if (strcmp(method, "receive") == 0) {
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_receive_ref);
ud->cb_receive_ref = luaL_ref(L, LUA_REGISTRYINDEX);
} else if (strcmp(method, "sent") == 0) {
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_sent_ref);
ud->cb_sent_ref = luaL_ref(L, LUA_REGISTRYINDEX);
} else if (strcmp(method, "dns") == 0) {
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_dns_ref);
ud->cb_dns_ref = luaL_ref(L, LUA_REGISTRYINDEX);
} else {
return luaL_error(L, "invalid method");
}
return 0;
}
static int tls_socket_send( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
if(ud->pesp_conn == NULL) {
NODE_DBG("not connected");
return 0;
}
size_t sl;
const char* buf = luaL_checklstring(L, 2, &sl);
if (!buf) {
return luaL_error(L, "wrong arg type");
}
espconn_secure_send(ud->pesp_conn, (void*)buf, sl);
return 0;
}
static int tls_socket_hold( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
if(ud->pesp_conn == NULL) {
NODE_DBG("not connected");
return 0;
}
espconn_recv_hold(ud->pesp_conn);
return 0;
}
static int tls_socket_unhold( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
if(ud->pesp_conn == NULL) {
NODE_DBG("not connected");
return 0;
}
espconn_recv_unhold(ud->pesp_conn);
return 0;
}
static int tls_socket_dns( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
return 0;
}
static int tls_socket_getpeer( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
if(ud->pesp_conn && ud->pesp_conn->proto.tcp->remote_port != 0){
char temp[20] = {0};
c_sprintf(temp, IPSTR, IP2STR( &(ud->pesp_conn->proto.tcp->remote_ip) ) );
lua_pushstring( L, temp );
lua_pushinteger( L, ud->pesp_conn->proto.tcp->remote_port );
} else {
lua_pushnil( L );
lua_pushnil( L );
}
return 2;
}
static int tls_socket_close( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
if (ud->pesp_conn) {
espconn_secure_disconnect(ud->pesp_conn);
}
return 0;
}
static int tls_socket_delete( lua_State *L ) {
tls_socket_ud *ud = (tls_socket_ud *)luaL_checkudata(L, 1, "tls.socket");
luaL_argcheck(L, ud, 1, "TLS socket expected");
if(ud==NULL){
NODE_DBG("userdata is nil.\n");
return 0;
}
if (ud->pesp_conn) {
espconn_secure_disconnect(ud->pesp_conn);
if (ud->pesp_conn->proto.tcp) {
c_free(ud->pesp_conn->proto.tcp);
ud->pesp_conn->proto.tcp = NULL;
}
c_free(ud->pesp_conn);
ud->pesp_conn = NULL;
}
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_connect_ref);
ud->cb_connect_ref = LUA_NOREF;
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_disconnect_ref);
ud->cb_disconnect_ref = LUA_NOREF;
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_reconnect_ref);
ud->cb_reconnect_ref = LUA_NOREF;
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_dns_ref);
ud->cb_dns_ref = LUA_NOREF;
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_receive_ref);
ud->cb_receive_ref = LUA_NOREF;
luaL_unref(L, LUA_REGISTRYINDEX, ud->cb_sent_ref);
ud->cb_sent_ref = LUA_NOREF;
lua_gc(L, LUA_GCSTOP, 0);
luaL_unref(L, LUA_REGISTRYINDEX, ud->self_ref);
ud->self_ref = LUA_NOREF;
lua_gc(L, LUA_GCRESTART, 0);
return 0;
}
// Returns NULL on success, error message otherwise
static const char *append_pem_blob(const char *pem, const char *type, uint8_t **buffer_p, uint8_t *buffer_limit, const char *name) {
char unb64[256];
memset(unb64, 0xff, sizeof(unb64));
int i;
for (i = 0; i < 64; i++) {
unb64["ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[i]] = i;
}
if (!pem) {
return "No PEM blob";
}
// Scan for -----BEGIN CERT
pem = strstr(pem, "-----BEGIN ");
if (!pem) {
return "No PEM header";
}
if (strncmp(pem + 11, type, strlen(type))) {
return "Wrong PEM type";
}
pem = strchr(pem, '\n');
if (!pem) {
return "Incorrect PEM format";
}
//
// Base64 encoded data starts here
// Get all the base64 data into a single buffer....
// We will use the back end of the buffer....
//
uint8_t *buffer = *buffer_p;
uint8_t *dest = buffer + 32 + 2; // Leave space for name and length
int bitcount = 0;
int accumulator = 0;
for (; *pem && dest < buffer_limit; pem++) {
int val = unb64[*(uint8_t*) pem];
if (val & 0xC0) {
// not a base64 character
if (isspace(*(uint8_t*) pem)) {
continue;
}
if (*pem == '=') {
// just ignore -- at the end
bitcount = 0;
continue;
}
if (*pem == '-') {
break;
}
return "Invalid character in PEM";
} else {
bitcount += 6;
accumulator = (accumulator << 6) + val;
if (bitcount >= 8) {
bitcount -= 8;
*dest++ = accumulator >> bitcount;
}
}
}
if (dest >= buffer_limit || strncmp(pem, "-----END ", 9) || strncmp(pem + 9, type, strlen(type)) || bitcount) {
return "Invalid PEM format data";
}
size_t len = dest - (buffer + 32 + 2);
memset(buffer, 0, 32);
strcpy(buffer, name);
buffer[32] = len & 0xff;
buffer[33] = (len >> 8) & 0xff;
*buffer_p = dest;
return NULL;
}
static const char *fill_page_with_pem(lua_State *L, const unsigned char *flash_memory, int flash_offset, const char **types, const char **names)
{
uint8_t *buffer = luaM_malloc(L, INTERNAL_FLASH_SECTOR_SIZE);
uint8_t *buffer_base = buffer;
uint8_t *buffer_limit = buffer + INTERNAL_FLASH_SECTOR_SIZE;
int argno;
for (argno = 1; argno <= lua_gettop(L) && types[argno - 1]; argno++) {
const char *pem = lua_tostring(L, argno);
const char *error = append_pem_blob(pem, types[argno - 1], &buffer, buffer_limit, names[argno - 1]);
if (error) {
luaM_free(L, buffer_base);
return error;
}
}
memset(buffer, 0xff, buffer_limit - buffer);
// Lets see if it matches what is already there....
if (c_memcmp(buffer_base, flash_memory, INTERNAL_FLASH_SECTOR_SIZE) != 0) {
// Starts being dangerous
if (platform_flash_erase_sector(flash_offset / INTERNAL_FLASH_SECTOR_SIZE) != PLATFORM_OK) {
luaM_free(L, buffer_base);
return "Failed to erase sector";
}
if (platform_s_flash_write(buffer_base, flash_offset, INTERNAL_FLASH_SECTOR_SIZE) != INTERNAL_FLASH_SECTOR_SIZE) {
luaM_free(L, buffer_base);
return "Failed to write sector";
}
// ends being dangerous
}
luaM_free(L, buffer_base);
return NULL;
}
// Lua: tls.cert.auth(true / false | PEM data [, PEM data] )
static int tls_cert_auth(lua_State *L)
{
int enable;
uint32_t flash_offset = platform_flash_mapped2phys((uint32_t) &tls_client_cert_area[0]);
if ((flash_offset & 0xfff) || flash_offset > 0xff000 || INTERNAL_FLASH_SECTOR_SIZE != 0x1000) {
// THis should never happen
return luaL_error( L, "bad offset" );
}
if (lua_type(L, 1) == LUA_TSTRING) {
const char *types[3] = { "CERTIFICATE", "RSA PRIVATE KEY", NULL };
const char *names[2] = { "certificate", "private_key" };
const char *error = fill_page_with_pem(L, &tls_client_cert_area[0], flash_offset, types, names);
if (error) {
return luaL_error(L, error);
}
enable = 1;
} else {
enable = lua_toboolean(L, 1);
}
bool rc;
if (enable) {
// See if there is a cert there
if (tls_client_cert_area[0] == 0x00 || tls_client_cert_area[0] == 0xff) {
return luaL_error( L, "no certificates found" );
}
rc = espconn_secure_cert_req_enable(1, flash_offset / INTERNAL_FLASH_SECTOR_SIZE);
} else {
rc = espconn_secure_cert_req_disable(1);
}
lua_pushboolean(L, rc);
return 1;
}
// Lua: tls.cert.verify(true / false | PEM data [, PEM data] )
static int tls_cert_verify(lua_State *L)
{
int enable;
uint32_t flash_offset = platform_flash_mapped2phys((uint32_t) &tls_server_cert_area[0]);
if ((flash_offset & 0xfff) || flash_offset > 0xff000 || INTERNAL_FLASH_SECTOR_SIZE != 0x1000) {
// THis should never happen
return luaL_error( L, "bad offset" );
}
if (lua_type(L, 1) == LUA_TSTRING) {
const char *types[2] = { "CERTIFICATE", NULL };
const char *names[1] = { "certificate" };
const char *error = fill_page_with_pem(L, &tls_server_cert_area[0], flash_offset, types, names);
if (error) {
return luaL_error(L, error);
}
enable = 1;
} else {
enable = lua_toboolean(L, 1);
}
bool rc;
if (enable) {
// See if there is a cert there
if (tls_server_cert_area[0] == 0x00 || tls_server_cert_area[0] == 0xff) {
return luaL_error( L, "no certificates found" );
}
rc = espconn_secure_ca_enable(1, flash_offset / INTERNAL_FLASH_SECTOR_SIZE);
} else {
rc = espconn_secure_ca_disable(1);
}
lua_pushboolean(L, rc);
return 1;
}
static const LUA_REG_TYPE tls_socket_map[] = {
{ LSTRKEY( "connect" ), LFUNCVAL( tls_socket_connect ) },
{ LSTRKEY( "close" ), LFUNCVAL( tls_socket_close ) },
{ LSTRKEY( "on" ), LFUNCVAL( tls_socket_on ) },
{ LSTRKEY( "send" ), LFUNCVAL( tls_socket_send ) },
{ LSTRKEY( "hold" ), LFUNCVAL( tls_socket_hold ) },
{ LSTRKEY( "unhold" ), LFUNCVAL( tls_socket_unhold ) },
{ LSTRKEY( "dns" ), LFUNCVAL( tls_socket_dns ) },
{ LSTRKEY( "getpeer" ), LFUNCVAL( tls_socket_getpeer ) },
{ LSTRKEY( "__gc" ), LFUNCVAL( tls_socket_delete ) },
{ LSTRKEY( "__index" ), LROVAL( tls_socket_map ) },
{ LNILKEY, LNILVAL }
};
const LUA_REG_TYPE tls_cert_map[] = {
{ LSTRKEY( "verify" ), LFUNCVAL( tls_cert_verify ) },
{ LSTRKEY( "auth" ), LFUNCVAL( tls_cert_auth ) },
{ LSTRKEY( "__index" ), LROVAL( tls_cert_map ) },
{ LNILKEY, LNILVAL }
};
static const LUA_REG_TYPE tls_map[] = {
{ LSTRKEY( "createConnection" ), LFUNCVAL( tls_socket_create ) },
{ LSTRKEY( "cert" ), LROVAL( tls_cert_map ) },
{ LSTRKEY( "__metatable" ), LROVAL( tls_map ) },
{ LNILKEY, LNILVAL }
};
int luaopen_tls( lua_State *L ) {
luaL_rometatable(L, "tls.socket", (void *)tls_socket_map); // create metatable for net.server
espconn_secure_set_size(ESPCONN_CLIENT, 4096);
return 0;
}
NODEMCU_MODULE(TLS, "tls", tls_map, luaopen_tls);
#endif
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