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2e074f4eb46491d97556c80177da0b89fba7334c
MaxScale/server/core/load_utils.c
Markus Mäkelä cefc253e2c Check configuration with declared parameters 
The declared parameters are now used to check whether the configuration is
valid. As the filters and monitors don't use the new declarations, the
code needs to be commented out. Once the parameter processing has been
migrated to the new system, the code can be enabled.
2017-01-05 09:58:10 +02:00

852 lines
25 KiB
C
Raw Blame History

/*
* Copyright (c) 2016 MariaDB Corporation Ab
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file and at www.mariadb.com/bsl.
*
* Change Date: 2019-07-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2 or later of the General
* Public License.
*/
/**
* @file load_utils.c Utility functions to aid the loading of dynamic
* modules into the gateway
*
* @verbatim
* Revision History
*
* Date Who Description
* 13/06/13 Mark Riddoch Initial implementation
* 14/06/13 Mark Riddoch Updated to add call to ModuleInit if one is
* defined in the loaded module.
* Also updated to call fixed GetModuleObject
* 02/06/14 Mark Riddoch Addition of module info
* 26/02/15 Massimiliano Pinto Addition of module_feedback_send
*
* @endverbatim
*/
#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dlfcn.h>
#include <maxscale/modules.h>
#include <maxscale/modinfo.h>
#include <maxscale/log_manager.h>
#include <maxscale/version.h>
#include <maxscale/notification.h>
#include <curl/curl.h>
#include <sys/utsname.h>
#include <openssl/sha.h>
#include <maxscale/gwdirs.h>
#include <maxscale/alloc.h>
typedef struct loaded_module
{
char *module; /**< The name of the module */
char *type; /**< The module type */
char *version; /**< Module version */
void *handle; /**< The handle returned by dlopen */
void *modobj; /**< The module "object" this is the set of entry points */
MXS_MODULE *info; /**< The module information */
struct loaded_module *next; /**< Next module in the linked list */
} LOADED_MODULE;
static LOADED_MODULE *registered = NULL;
static LOADED_MODULE *find_module(const char *module);
static LOADED_MODULE* register_module(const char *module,
const char *type,
void *dlhandle,
MXS_MODULE *mod_info);
static void unregister_module(const char *module);
int module_create_feedback_report(GWBUF **buffer, LOADED_MODULE *modules, FEEDBACK_CONF *cfg);
int do_http_post(GWBUF *buffer, void *cfg);
struct MemoryStruct
{
char *data;
size_t size;
};
/**
* Callback write routine for curl library, getting remote server reply
*
* @param contents New data to add
* @param size Data size
* @param nmemb Elements in the buffer
* @param userp Pointer to the buffer
* @return 0 on failure, memory size on success
*
*/
static size_t
WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)userp;
void *data = MXS_REALLOC(mem->data, mem->size + realsize + 1);
if (data == NULL)
{
return 0;
}
mem->data = data;
memcpy(&(mem->data[mem->size]), contents, realsize);
mem->size += realsize;
mem->data[mem->size] = 0;
return realsize;
}
static bool check_module(const MXS_MODULE *mod_info, const char *type, const char *module)
{
bool success = true;
if (strcmp(type, MODULE_PROTOCOL) == 0
&& mod_info->modapi != MXS_MODULE_API_PROTOCOL)
{
MXS_ERROR("Module '%s' does not implement the protocol API.", module);
success = false;
}
if (strcmp(type, MODULE_AUTHENTICATOR) == 0
&& mod_info->modapi != MXS_MODULE_API_AUTHENTICATOR)
{
MXS_ERROR("Module '%s' does not implement the authenticator API.", module);
success = false;
}
if (strcmp(type, MODULE_ROUTER) == 0
&& mod_info->modapi != MXS_MODULE_API_ROUTER)
{
MXS_ERROR("Module '%s' does not implement the router API.", module);
success = false;
}
if (strcmp(type, MODULE_MONITOR) == 0
&& mod_info->modapi != MXS_MODULE_API_MONITOR)
{
MXS_ERROR("Module '%s' does not implement the monitor API.", module);
success = false;
}
if (strcmp(type, MODULE_FILTER) == 0
&& mod_info->modapi != MXS_MODULE_API_FILTER)
{
MXS_ERROR("Module '%s' does not implement the filter API.", module);
success = false;
}
if (strcmp(type, MODULE_QUERY_CLASSIFIER) == 0
&& mod_info->modapi != MXS_MODULE_API_QUERY_CLASSIFIER)
{
MXS_ERROR("Module '%s' does not implement the query classifier API.", module);
success = false;
}
if (mod_info->version == NULL)
{
MXS_ERROR("Module '%s' does not define a version string", module);
success = false;
}
if (mod_info->module_object == NULL)
{
MXS_ERROR("Module '%s' does not define a module object", module);
success = false;
}
return success;
}
void *load_module(const char *module, const char *type)
{
ss_dassert(module && type);
LOADED_MODULE *mod;
if ((mod = find_module(module)) == NULL)
{
/** The module is not already loaded, search for the shared object */
char fname[MAXPATHLEN + 1];
snprintf(fname, MAXPATHLEN + 1, "%s/lib%s.so", get_libdir(), module);
if (access(fname, F_OK) == -1)
{
MXS_ERROR("Unable to find library for "
"module: %s. Module dir: %s",
module, get_libdir());
return NULL;
}
void *dlhandle = dlopen(fname, RTLD_NOW | RTLD_LOCAL);
if (dlhandle == NULL)
{
MXS_ERROR("Unable to load library for module: "
"%s\n\n\t\t %s."
"\n\n",
module, dlerror());
return NULL;
}
void *sym = dlsym(dlhandle, MXS_MODULE_SYMBOL_NAME);
if (sym == NULL)
{
MXS_ERROR("Expected entry point interface missing "
"from module: %s\n\t\t\t %s.",
module, dlerror());
dlclose(dlhandle);
return NULL;
}
void *(*entry_point)() = sym;
MXS_MODULE *mod_info = entry_point();
if (!check_module(mod_info, type, module) ||
(mod = register_module(module, type, dlhandle, mod_info)) == NULL)
{
dlclose(dlhandle);
return NULL;
}
MXS_NOTICE("Loaded module %s: %s from %s", module, mod_info->version, fname);
}
return mod->modobj;
}
void unload_module(const char *module)
{
LOADED_MODULE *mod = find_module(module);
if (mod)
{
void *handle = mod->handle;
unregister_module(module);
dlclose(handle);
}
}
/**
* Find a module that has been previously loaded and return the handle for that
* library
*
* @param module The name of the module
* @return The module handle or NULL if it was not found
*/
static LOADED_MODULE *
find_module(const char *module)
{
LOADED_MODULE *mod = registered;
if (module)
{
while (mod)
{
if (strcmp(mod->module, module) == 0)
{
return mod;
}
else
{
mod = mod->next;
}
}
}
return NULL;
}
/**
* Register a newly loaded module. The registration allows for single copies
* to be loaded and cached entry point information to be return.
*
* @param module The name of the module loaded
* @param type The type of the module loaded
* @param dlhandle The handle returned by dlopen
* @param version The version string returned by the module
* @param modobj The module object
* @param mod_info The module information
* @return The new registered module or NULL on memory allocation failure
*/
static LOADED_MODULE* register_module(const char *module,
const char *type,
void *dlhandle,
MXS_MODULE *mod_info)
{
module = MXS_STRDUP(module);
type = MXS_STRDUP(type);
char *version = MXS_STRDUP(mod_info->version);
LOADED_MODULE *mod = (LOADED_MODULE *)MXS_MALLOC(sizeof(LOADED_MODULE));
if (!module || !type || !version || !mod)
{
MXS_FREE((void*)module);
MXS_FREE((void*)type);
MXS_FREE(version);
MXS_FREE(mod);
return NULL;
}
mod->module = (char*)module;
mod->type = (char*)type;
mod->handle = dlhandle;
mod->version = version;
mod->modobj = mod_info->module_object;
mod->next = registered;
mod->info = mod_info;
registered = mod;
return mod;
}
/**
* Unregister a module
*
* @param module The name of the module to remove
*/
static void
unregister_module(const char *module)
{
LOADED_MODULE *mod = find_module(module);
LOADED_MODULE *ptr;
if (!mod)
{
return; // Module not found
}
if (registered == mod)
{
registered = mod->next;
}
else
{
ptr = registered;
while (ptr && ptr->next != mod)
{
ptr = ptr->next;
}
/*<
* Remove the module to be be freed from the list.
*/
if (ptr && (ptr->next == mod))
{
ptr->next = ptr->next->next;
}
}
/*<
* The module is now not in the linked list and all
* memory related to it can be freed
*/
dlclose(mod->handle);
MXS_FREE(mod->module);
MXS_FREE(mod->type);
MXS_FREE(mod->version);
MXS_FREE(mod);
}
void unload_all_modules()
{
while (registered)
{
unregister_module(registered->module);
}
}
void printModules()
{
LOADED_MODULE *ptr = registered;
printf("%-15s | %-11s | Version\n", "Module Name", "Module Type");
printf("-----------------------------------------------------\n");
while (ptr)
{
printf("%-15s | %-11s | %s\n", ptr->module, ptr->type, ptr->version);
ptr = ptr->next;
}
}
void dprintAllModules(DCB *dcb)
{
LOADED_MODULE *ptr = registered;
dcb_printf(dcb, "Modules.\n");
dcb_printf(dcb, "----------------+-----------------+---------+-------+-------------------------\n");
dcb_printf(dcb, "%-15s | %-15s | Version | API | Status\n", "Module Name", "Module Type");
dcb_printf(dcb, "----------------+-----------------+---------+-------+-------------------------\n");
while (ptr)
{
dcb_printf(dcb, "%-15s | %-15s | %-7s ", ptr->module, ptr->type, ptr->version);
if (ptr->info)
dcb_printf(dcb, "| %d.%d.%d | %s",
ptr->info->api_version.major,
ptr->info->api_version.minor,
ptr->info->api_version.patch,
ptr->info->status == MXS_MODULE_IN_DEVELOPMENT
? "In Development"
: (ptr->info->status == MXS_MODULE_ALPHA_RELEASE
? "Alpha"
: (ptr->info->status == MXS_MODULE_BETA_RELEASE
? "Beta"
: (ptr->info->status == MXS_MODULE_GA
? "GA"
: (ptr->info->status == MXS_MODULE_EXPERIMENTAL
? "Experimental" : "Unknown")))));
dcb_printf(dcb, "\n");
ptr = ptr->next;
}
dcb_printf(dcb, "----------------+-----------------+---------+-------+-------------------------\n\n");
}
void moduleShowFeedbackReport(DCB *dcb)
{
GWBUF *buffer;
LOADED_MODULE *modules_list = registered;
FEEDBACK_CONF *feedback_config = config_get_feedback_data();
if (!module_create_feedback_report(&buffer, modules_list, feedback_config))
{
MXS_ERROR("Error in module_create_feedback_report(): gwbuf_alloc() failed to allocate memory");
return;
}
dcb_printf(dcb, "%s", (char *)GWBUF_DATA(buffer));
gwbuf_free(buffer);
}
/**
* Provide a row to the result set that defines the set of modules
*
* @param set The result set
* @param data The index of the row to send
* @return The next row or NULL
*/
static RESULT_ROW *
moduleRowCallback(RESULTSET *set, void *data)
{
int *rowno = (int *)data;
int i = 0;;
char *stat, buf[20];
RESULT_ROW *row;
LOADED_MODULE *ptr;
ptr = registered;
while (i < *rowno && ptr)
{
i++;
ptr = ptr->next;
}
if (ptr == NULL)
{
MXS_FREE(data);
return NULL;
}
(*rowno)++;
row = resultset_make_row(set);
resultset_row_set(row, 0, ptr->module);
resultset_row_set(row, 1, ptr->type);
resultset_row_set(row, 2, ptr->version);
snprintf(buf, 19, "%d.%d.%d", ptr->info->api_version.major,
ptr->info->api_version.minor,
ptr->info->api_version.patch);
buf[19] = '\0';
resultset_row_set(row, 3, buf);
resultset_row_set(row, 4, ptr->info->status == MXS_MODULE_IN_DEVELOPMENT
? "In Development"
: (ptr->info->status == MXS_MODULE_ALPHA_RELEASE
? "Alpha"
: (ptr->info->status == MXS_MODULE_BETA_RELEASE
? "Beta"
: (ptr->info->status == MXS_MODULE_GA
? "GA"
: (ptr->info->status == MXS_MODULE_EXPERIMENTAL
? "Experimental" : "Unknown")))));
return row;
}
RESULTSET *moduleGetList()
{
RESULTSET *set;
int *data;
if ((data = (int *)MXS_MALLOC(sizeof(int))) == NULL)
{
return NULL;
}
*data = 0;
if ((set = resultset_create(moduleRowCallback, data)) == NULL)
{
MXS_FREE(data);
return NULL;
}
resultset_add_column(set, "Module Name", 18, COL_TYPE_VARCHAR);
resultset_add_column(set, "Module Type", 12, COL_TYPE_VARCHAR);
resultset_add_column(set, "Version", 10, COL_TYPE_VARCHAR);
resultset_add_column(set, "API Version", 8, COL_TYPE_VARCHAR);
resultset_add_column(set, "Status", 15, COL_TYPE_VARCHAR);
return set;
}
void module_feedback_send(void* data)
{
LOADED_MODULE *modules_list = registered;
CURL *curl = NULL;
CURLcode res;
struct curl_httppost *formpost = NULL;
struct curl_httppost *lastptr = NULL;
GWBUF *buffer = NULL;
void *data_ptr = NULL;
long http_code = 0;
int last_action = _NOTIFICATION_SEND_PENDING;
time_t now;
struct tm *now_tm;
int hour;
int n_mod = 0;
char hex_setup_info[2 * SHA_DIGEST_LENGTH + 1] = "";
int http_send = 0;
now = time(NULL);
struct tm now_result;
now_tm = localtime_r(&now, &now_result);
hour = now_tm->tm_hour;
FEEDBACK_CONF *feedback_config = (FEEDBACK_CONF *) data;
/* Configuration check */
if (feedback_config->feedback_enable == 0 ||
feedback_config->feedback_url == NULL ||
feedback_config->feedback_user_info == NULL)
{
MXS_ERROR("Error in module_feedback_send(): some mandatory parameters are not set"
" feedback_enable=%u, feedback_url=%s, feedback_user_info=%s",
feedback_config->feedback_enable,
feedback_config->feedback_url == NULL ? "NULL" : feedback_config->feedback_url,
feedback_config->feedback_user_info == NULL ?
"NULL" : feedback_config->feedback_user_info);
feedback_config->feedback_last_action = _NOTIFICATION_SEND_ERROR;
return;
}
/**
* Task runs nightly, from 2 AM to 4 AM
*
* If it's done in that time interval, it will be skipped
*/
if (hour > 4 || hour < 2)
{
/* It's not the rigt time, mark it as to be done and return */
feedback_config->feedback_last_action = _NOTIFICATION_SEND_PENDING;
MXS_INFO("module_feedback_send(): execution skipped, current hour [%d]"
" is not within the proper interval (from 2 AM to 4 AM)",
hour);
return;
}
/* Time to run the task: if a previous run was succesfull skip next runs */
if (feedback_config->feedback_last_action == _NOTIFICATION_SEND_OK)
{
/* task was done before, return */
MXS_INFO("module_feedback_send(): execution skipped because of previous "
"succesful run: hour is [%d], last_action [%d]",
hour, feedback_config->feedback_last_action);
return;
}
MXS_INFO("module_feedback_send(): task now runs: hour is [%d], last_action [%d]",
hour, feedback_config->feedback_last_action);
if (!module_create_feedback_report(&buffer, modules_list, feedback_config))
{
MXS_ERROR("Error in module_create_feedback_report(): gwbuf_alloc() failed to allocate memory");
feedback_config->feedback_last_action = _NOTIFICATION_SEND_ERROR;
return;
}
/* try sending data via http/https post */
http_send = do_http_post(buffer, feedback_config);
if (http_send == 0)
{
feedback_config->feedback_last_action = _NOTIFICATION_SEND_OK;
}
else
{
feedback_config->feedback_last_action = _NOTIFICATION_SEND_ERROR;
MXS_INFO("Error in module_create_feedback_report(): do_http_post ret_code is %d", http_send);
}
MXS_INFO("module_feedback_send(): task completed: hour is [%d], last_action [%d]",
hour,
feedback_config->feedback_last_action);
gwbuf_free(buffer);
}
/**
* Create the feedback report as string.
* I t could be sent to notification service
* or just printed via maxadmin/telnet
*
* @param buffe The pointr for GWBUF allocation, to be freed by the caller
* @param modules The mouleds list
* @param cfg The feedback configuration
* @return 0 on failure, 1 on success
*
*/
int
module_create_feedback_report(GWBUF **buffer, LOADED_MODULE *modules, FEEDBACK_CONF *cfg)
{
LOADED_MODULE *ptr = modules;
int n_mod = 0;
char *data_ptr = NULL;
char hex_setup_info[2 * SHA_DIGEST_LENGTH + 1] = "";
time_t now;
struct tm *now_tm;
int report_max_bytes = 0;
if (buffer == NULL)
{
return 0;
}
now = time(NULL);
/* count loaded modules */
while (ptr)
{
ptr = ptr->next;
n_mod++;
}
/* module lists pointer is set back to the head */
ptr = modules;
/**
* allocate gwbuf for data to send
*
* each module gives 4 rows
* product and release rows add 7 rows
* row is _NOTIFICATION_REPORT_ROW_LEN bytes long
*/
report_max_bytes = ((n_mod * 4) + 7) * (_NOTIFICATION_REPORT_ROW_LEN + 1);
*buffer = gwbuf_alloc(report_max_bytes);
if (*buffer == NULL)
{
return 0;
}
/* encode MAC-sha1 to HEX */
gw_bin2hex(hex_setup_info, cfg->mac_sha1, SHA_DIGEST_LENGTH);
data_ptr = (char *)GWBUF_DATA(*buffer);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "FEEDBACK_SERVER_UID\t%s\n", hex_setup_info);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "FEEDBACK_USER_INFO\t%s\n",
cfg->feedback_user_info == NULL ? "not_set" : cfg->feedback_user_info);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "VERSION\t%s\n", MAXSCALE_VERSION);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN * 2, "NOW\t%lu\nPRODUCT\t%s\n", now, "maxscale");
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "Uname_sysname\t%s\n", cfg->sysname);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "Uname_distribution\t%s\n", cfg->release_info);
data_ptr += strlen(data_ptr);
while (ptr)
{
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN * 2,
"module_%s_type\t%s\nmodule_%s_version\t%s\n",
ptr->module, ptr->type, ptr->module, ptr->version);
data_ptr += strlen(data_ptr);
if (ptr->info)
{
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "module_%s_api\t%d.%d.%d\n",
ptr->module,
ptr->info->api_version.major,
ptr->info->api_version.minor,
ptr->info->api_version.patch);
data_ptr += strlen(data_ptr);
snprintf(data_ptr, _NOTIFICATION_REPORT_ROW_LEN, "module_%s_releasestatus\t%s\n",
ptr->module,
ptr->info->status == MXS_MODULE_IN_DEVELOPMENT
? "In Development"
: (ptr->info->status == MXS_MODULE_ALPHA_RELEASE
? "Alpha"
: (ptr->info->status == MXS_MODULE_BETA_RELEASE
? "Beta"
: (ptr->info->status == MXS_MODULE_GA
? "GA"
: (ptr->info->status == MXS_MODULE_EXPERIMENTAL
? "Experimental" : "Unknown")))));
data_ptr += strlen(data_ptr);
}
ptr = ptr->next;
}
return 1;
}
/**
* Send data to notification service via http/https
*
* @param buffer The GWBUF with data to send
* @param cfg The configuration details of notification service
* @return 0 on success, != 0 on failure
*/
int
do_http_post(GWBUF *buffer, void *cfg)
{
CURL *curl = NULL;
CURLcode res;
struct curl_httppost *formpost = NULL;
struct curl_httppost *lastptr = NULL;
long http_code = 0;
struct MemoryStruct chunk;
int ret_code = 1;
FEEDBACK_CONF *feedback_config = (FEEDBACK_CONF *) cfg;
/* allocate first memory chunck for httpd servr reply */
chunk.data = MXS_MALLOC(1); /* will be grown as needed by the realloc above */
MXS_ABORT_IF_NULL(chunk.data);
chunk.size = 0; /* no data at this point */
/* Initializing curl library for data send via HTTP */
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if (curl)
{
char error_message[CURL_ERROR_SIZE] = "";
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error_message);
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, feedback_config->feedback_connect_timeout);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, feedback_config->feedback_timeout);
/* curl API call for data send via HTTP POST using a "file" type input */
curl_formadd(&formpost,
&lastptr,
CURLFORM_COPYNAME, "data",
CURLFORM_BUFFER, "report.txt",
CURLFORM_BUFFERPTR, (char *)GWBUF_DATA(buffer),
CURLFORM_BUFFERLENGTH, strlen((char *)GWBUF_DATA(buffer)),
CURLFORM_CONTENTTYPE, "text/plain",
CURLFORM_END);
curl_easy_setopt(curl, CURLOPT_HEADER, 1);
/* some servers don't like requests that are made without a user-agent field, so we provide one */
curl_easy_setopt(curl, CURLOPT_USERAGENT, "MaxScale-agent/http-1.0");
/* Force HTTP/1.0 */
curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
curl_easy_setopt(curl, CURLOPT_URL, feedback_config->feedback_url);
curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
/* send all data to this function */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
/* we pass our 'chunk' struct to the callback function */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if (res != CURLE_OK)
{
ret_code = 2;
MXS_ERROR("do_http_post(), curl call for [%s] failed due: %s, %s",
feedback_config->feedback_url,
curl_easy_strerror(res),
error_message);
goto cleanup;
}
else
{
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
}
if (http_code == 302)
{
char *from = strstr(chunk.data, "<h1>ok</h1>");
if (from)
{
ret_code = 0;
}
else
{
ret_code = 3;
goto cleanup;
}
}
else
{
MXS_ERROR("do_http_post(), Bad HTTP Code from remote server: %lu", http_code);
ret_code = 4;
goto cleanup;
}
}
else
{
MXS_ERROR("do_http_post(), curl object not initialized");
ret_code = 1;
goto cleanup;
}
MXS_INFO("do_http_post() ret_code [%d], HTTP code [%ld]",
ret_code, http_code);
cleanup:
if (chunk.data)
{
MXS_FREE(chunk.data);
}
if (curl)
{
curl_easy_cleanup(curl);
curl_formfree(formpost);
}
curl_global_cleanup();
return ret_code;
}
const MXS_MODULE *get_module(const char *name, const char *type)
{
LOADED_MODULE *mod = find_module(name);
if (mod == NULL && load_module(name, type))
{
mod = find_module(name);
}
return mod ? mod->info : NULL;
}
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