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/* Copyright (C) 2009-2011 Codership Oy <info@codersihp.com>
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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*! @file wsrep implementation loader */
#include <dlfcn.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include "wsrep_api.h"
// Logging stuff for the loader
static const char* log_levels[] = {"FATAL", "ERROR", "WARN", "INFO", "DEBUG"};
static void default_logger (wsrep_log_level_t lvl, const char* msg)
{
fprintf (stderr, "wsrep loader: [%s] %s\n", log_levels[lvl], msg);
}
static wsrep_log_cb_t logger = default_logger;
/**************************************************************************
* Library loader
**************************************************************************/
static int wsrep_check_iface_version(const char* found, const char* iface_ver)
{
const size_t msg_len = 128;
char msg[128];
if (strcmp(found, iface_ver)) {
snprintf (msg, msg_len,
"provider interface version mismatch: need '%s', found '%s'",
iface_ver, found);
logger (WSREP_LOG_ERROR, msg);
return EINVAL;
}
return 0;
}
static int verify(const wsrep_t *wh, const char *iface_ver)
{
char msg[128];
#define VERIFY(_p) if (!(_p)) { \
snprintf(msg, sizeof(msg), "wsrep_load(): verify(): %s\n", # _p); \
logger (WSREP_LOG_ERROR, msg); \
return EINVAL; \
}
VERIFY(wh);
VERIFY(wh->version);
if (wsrep_check_iface_version(wh->version, iface_ver))
return EINVAL;
VERIFY(wh->init);
VERIFY(wh->options_set);
VERIFY(wh->options_get);
VERIFY(wh->connect);
VERIFY(wh->disconnect);
VERIFY(wh->recv);
VERIFY(wh->pre_commit);
VERIFY(wh->post_commit);
VERIFY(wh->post_rollback);
VERIFY(wh->replay_trx);
VERIFY(wh->abort_pre_commit);
VERIFY(wh->append_key);
VERIFY(wh->append_data);
VERIFY(wh->free_connection);
VERIFY(wh->to_execute_start);
VERIFY(wh->to_execute_end);
VERIFY(wh->preordered_collect);
VERIFY(wh->preordered_commit);
VERIFY(wh->sst_sent);
VERIFY(wh->sst_received);
VERIFY(wh->stats_get);
VERIFY(wh->stats_free);
VERIFY(wh->stats_reset);
VERIFY(wh->pause);
VERIFY(wh->resume);
VERIFY(wh->desync);
VERIFY(wh->resync);
VERIFY(wh->lock);
VERIFY(wh->unlock);
VERIFY(wh->is_locked);
VERIFY(wh->provider_name);
VERIFY(wh->provider_version);
VERIFY(wh->provider_vendor);
VERIFY(wh->free);
return 0;
}
typedef int (*wsrep_loader_fun)(wsrep_t*);
static wsrep_loader_fun wsrep_dlf(void *dlh, const char *sym)
{
union {
wsrep_loader_fun dlfun;
void *obj;
} alias;
alias.obj = dlsym(dlh, sym);
return alias.dlfun;
}
static int wsrep_check_version_symbol(void *dlh)
{
char** dlversion = NULL;
dlversion = (char**) dlsym(dlh, "wsrep_interface_version");
if (dlversion == NULL)
return 0;
return wsrep_check_iface_version(*dlversion, WSREP_INTERFACE_VERSION);
}
extern int wsrep_dummy_loader(wsrep_t *w);
int wsrep_load(const char *spec, wsrep_t **hptr, wsrep_log_cb_t log_cb)
{
int ret = 0;
void *dlh = NULL;
wsrep_loader_fun dlfun;
char msg[1025];
msg[sizeof(msg)-1] = 0;
if (NULL != log_cb)
logger = log_cb;
if (!(spec && hptr))
return EINVAL;
snprintf (msg, sizeof(msg)-1,
"wsrep_load(): loading provider library '%s'", spec);
logger (WSREP_LOG_INFO, msg);
if (!(*hptr = malloc(sizeof(wsrep_t)))) {
logger (WSREP_LOG_FATAL, "wsrep_load(): out of memory");
return ENOMEM;
}
if (!spec || strcmp(spec, WSREP_NONE) == 0) {
if ((ret = wsrep_dummy_loader(*hptr)) != 0) {
free (*hptr);
*hptr = NULL;
}
return ret;
}
if (!(dlh = dlopen(spec, RTLD_NOW | RTLD_LOCAL))) {
snprintf(msg, sizeof(msg)-1, "wsrep_load(): dlopen(): %s", dlerror());
logger (WSREP_LOG_ERROR, msg);
ret = EINVAL;
goto out;
}
if (!(dlfun = wsrep_dlf(dlh, "wsrep_loader"))) {
ret = EINVAL;
goto out;
}
if (wsrep_check_version_symbol(dlh) != 0) {
ret = EINVAL;
goto out;
}
if ((ret = (*dlfun)(*hptr)) != 0) {
snprintf(msg, sizeof(msg)-1, "wsrep_load(): loader failed: %s",
strerror(ret));
logger (WSREP_LOG_ERROR, msg);
goto out;
}
if ((ret = verify(*hptr, WSREP_INTERFACE_VERSION)) != 0) {
snprintf (msg, sizeof(msg)-1,
"wsrep_load(): interface version mismatch: my version %s, "
"provider version %s", WSREP_INTERFACE_VERSION,
(*hptr)->version);
logger (WSREP_LOG_ERROR, msg);
goto out;
}
(*hptr)->dlh = dlh;
out:
if (ret != 0) {
if (dlh) dlclose(dlh);
free(*hptr);
*hptr = NULL;
} else {
snprintf (msg, sizeof(msg)-1,
"wsrep_load(): %s %s by %s loaded successfully.",
(*hptr)->provider_name, (*hptr)->provider_version,
(*hptr)->provider_vendor);
logger (WSREP_LOG_INFO, msg);
}
return ret;
}
void wsrep_unload(wsrep_t *hptr)
{
if (!hptr) {
logger (WSREP_LOG_WARN, "wsrep_unload(): null pointer.");
} else {
if (hptr->free)
hptr->free(hptr);
if (hptr->dlh)
dlclose(hptr->dlh);
free(hptr);
}
}
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