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/*
* stunnel TLS offloading and load-balancing proxy
* Copyright (C) 1998-2018 Michal Trojnara <Michal.Trojnara@stunnel.org>
*
* This program 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 2 of the License, or (at your
* option) any later version.
*
* This program 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 this program; if not, see <http://www.gnu.org/licenses>.
*
* Linking stunnel statically or dynamically with other modules is making
* a combined work based on stunnel. Thus, the terms and conditions of
* the GNU General Public License cover the whole combination.
*
* In addition, as a special exception, the copyright holder of stunnel
* gives you permission to combine stunnel with free software programs or
* libraries that are released under the GNU LGPL and with code included
* in the standard release of OpenSSL under the OpenSSL License (or
* modified versions of such code, with unchanged license). You may copy
* and distribute such a system following the terms of the GNU GPL for
* stunnel and the licenses of the other code concerned.
*
* Note that people who make modified versions of stunnel are not obligated
* to grant this special exception for their modified versions; it is their
* choice whether to do so. The GNU General Public License gives permission
* to release a modified version without this exception; this exception
* also makes it possible to release a modified version which carries
* forward this exception.
*/
#include "common.h"
#include "prototypes.h"
volatile int tls_initialized=0;
NOEXPORT void tls_platform_init();
#if OPENSSL_VERSION_NUMBER<0x10100000L
NOEXPORT void free_function(void *);
#endif
/**************************************** thread local storage */
/* this has to be the first function called from ui_*.c */
void tls_init() {
tls_platform_init();
tls_initialized=1;
ui_tls=tls_alloc(NULL, NULL, "ui");
#if OPENSSL_VERSION_NUMBER>=0x10100000L
CRYPTO_set_mem_functions(str_alloc_detached_debug,
str_realloc_detached_debug, str_free_debug);
#else
CRYPTO_set_mem_ex_functions(str_alloc_detached_debug,
str_realloc_detached_debug, free_function);
#endif
}
/* this has to be the first function called by a new thread */
TLS_DATA *tls_alloc(CLI *c, TLS_DATA *inherited, char *txt) {
TLS_DATA *tls_data;
if(inherited) { /* reuse the thread-local storage after fork() */
tls_data=inherited;
str_free(tls_data->id);
} else {
tls_data=calloc(1, sizeof(TLS_DATA));
if(!tls_data)
fatal("Out of memory");
if(c)
c->tls=tls_data;
str_init(tls_data);
tls_data->c=c;
tls_data->opt=c?c->opt:&service_options;
}
tls_data->id="unconfigured";
tls_set(tls_data);
/* str.c functions can be used below this point */
if(txt) {
tls_data->id=str_dup(txt);
str_detach(tls_data->id); /* it is deallocated after str_stats() */
} else if(c) {
tls_data->id=log_id(c);
str_detach(tls_data->id); /* it is deallocated after str_stats() */
}
return tls_data;
}
/* per-thread thread-local storage cleanup */
void tls_cleanup() {
TLS_DATA *tls_data;
tls_data=tls_get();
if(!tls_data)
return;
str_cleanup(tls_data);
str_free(tls_data->id); /* detached allocation */
tls_set(NULL);
free(tls_data);
}
#ifdef USE_UCONTEXT
static TLS_DATA *global_tls=NULL;
NOEXPORT void tls_platform_init() {
}
void tls_set(TLS_DATA *tls_data) {
if(ready_head)
ready_head->tls=tls_data;
else /* ucontext threads not initialized */
global_tls=tls_data;
}
TLS_DATA *tls_get() {
if(ready_head)
return ready_head->tls;
else /* ucontext threads not initialized */
return global_tls;
}
#endif /* USE_UCONTEXT */
#ifdef USE_FORK
static TLS_DATA *global_tls=NULL;
NOEXPORT void tls_platform_init() {
}
void tls_set(TLS_DATA *tls_data) {
global_tls=tls_data;
}
TLS_DATA *tls_get() {
return global_tls;
}
#endif /* USE_FORK */
#ifdef USE_PTHREAD
static pthread_key_t pthread_key;
NOEXPORT void tls_platform_init() {
pthread_key_create(&pthread_key, NULL);
}
void tls_set(TLS_DATA *tls_data) {
pthread_setspecific(pthread_key, tls_data);
}
TLS_DATA *tls_get() {
return pthread_getspecific(pthread_key);
}
#endif /* USE_PTHREAD */
#ifdef USE_WIN32
static DWORD tls_index;
NOEXPORT void tls_platform_init() {
tls_index=TlsAlloc();
}
void tls_set(TLS_DATA *tls_data) {
TlsSetValue(tls_index, tls_data);
}
TLS_DATA *tls_get() {
return TlsGetValue(tls_index);
}
#endif /* USE_WIN32 */
/**************************************** OpenSSL allocator hook */
#if OPENSSL_VERSION_NUMBER<0x10100000L
NOEXPORT void free_function(void *ptr) {
/* CRYPTO_set_mem_ex_functions() needs a function rather than a macro */
/* unfortunately, OpenSSL provides no file:line information here */
str_free_debug(ptr, "OpenSSL", 0);
}
#endif
/* end of tls.c */
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