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unbound/dynlibmod/dynlibmod.c
W.C.A. Wijngaards ff653a7ef8 Call module init init again, and new function startup and destartup. 
NULL can be used if the function is not used. Open shared ports during
reload. Deinit is called during reload.
2024-07-01 16:10:07 +02:00

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/**
* \file
* This file contains the dynamic library module for Unbound.
* This loads a dynamic library (.dll, .so) and calls that for the
* module actions.
*/
#include "config.h"
#include "dynlibmod/dynlibmod.h"
#include "util/module.h"
#include "util/config_file.h"
#if HAVE_WINDOWS_H
#include <windows.h>
#define __DYNMOD HMODULE
#define __DYNSYM FARPROC
#define __LOADSYM GetProcAddress
static void log_dlerror() {
DWORD dwLastError = GetLastError();
LPSTR MessageBuffer;
DWORD dwBufferLength;
DWORD dwFormatFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_IGNORE_INSERTS |
FORMAT_MESSAGE_FROM_SYSTEM ;
if((dwBufferLength = FormatMessageA(
dwFormatFlags,
NULL, // module to get message from (NULL == system)
dwLastError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // default language
(LPSTR) &MessageBuffer,
0,
NULL
)))
{
log_err("dynlibmod: %s (%ld)", MessageBuffer, dwLastError);
LocalFree(MessageBuffer);
}
}
static HMODULE open_library(const char* fname) {
return LoadLibrary(fname);
}
static void close_library(const char* fname, __DYNMOD handle) {
(void)fname;
(void)handle;
}
#else
#include <dlfcn.h>
#define __DYNMOD void*
#define __DYNSYM void*
#define __LOADSYM dlsym
static void log_dlerror() {
log_err("dynlibmod: %s", dlerror());
}
static void* open_library(const char* fname) {
return dlopen(fname, RTLD_LAZY | RTLD_GLOBAL);
}
static void close_library(const char* fname, __DYNMOD handle) {
if(!handle) return;
if(dlclose(handle) != 0) {
log_err("dlclose %s: %s", fname, strerror(errno));
}
}
#endif
/** module counter for multiple dynlib modules */
static int dynlib_mod_count = 0;
/** dynlib module init */
int dynlibmod_init(struct module_env* env, int id) {
int dynlib_mod_idx = dynlib_mod_count++;
struct config_strlist* cfg_item = env->cfg->dynlib_file;
struct dynlibmod_env* de = (struct dynlibmod_env*)calloc(1, sizeof(struct dynlibmod_env));
__DYNMOD dynamic_library;
int i;
if (!de)
{
log_err("dynlibmod[%d]: malloc failure", dynlib_mod_idx);
return 0;
}
env->modinfo[id] = (void*) de;
de->fname = NULL;
for(i = dynlib_mod_idx;
i != 0 && cfg_item != NULL;
i--, cfg_item = cfg_item->next) {}
if (cfg_item == NULL || cfg_item->str == NULL || cfg_item->str[0] == 0) {
log_err("dynlibmod[%d]: no dynamic library given.", dynlib_mod_idx);
return 0;
} else {
de->fname = cfg_item->str;
}
verbose(VERB_ALGO, "dynlibmod[%d]: Trying to load library %s", dynlib_mod_idx, de->fname);
dynamic_library = open_library(de->fname);
de->dynamic_library = (void*)dynamic_library;
if (dynamic_library == NULL) {
log_dlerror();
log_err("dynlibmod[%d]: unable to load dynamic library \"%s\".", dynlib_mod_idx, de->fname);
return 0;
} else {
__DYNSYM initializer;
__DYNSYM deinitializer;
__DYNSYM operate;
__DYNSYM inform;
__DYNSYM clear;
__DYNSYM get_mem;
initializer = __LOADSYM(dynamic_library,"init");
if (initializer == NULL) {
log_dlerror();
log_err("dynlibmod[%d]: unable to load init procedure from dynamic library \"%s\".", dynlib_mod_idx, de->fname);
return 0;
} else {
de->func_init = (func_init_t)(void*)initializer;
}
deinitializer = __LOADSYM(dynamic_library,"deinit");
if (deinitializer == NULL) {
log_dlerror();
log_err("dynlibmod[%d]: unable to load deinit procedure from dynamic library \"%s\".", dynlib_mod_idx, de->fname);
return 0;
} else {
de->func_deinit = (func_deinit_t)(void*)deinitializer;
}
operate = __LOADSYM(dynamic_library,"operate");
if (operate == NULL) {
log_dlerror();
log_err("dynlibmod[%d]: unable to load operate procedure from dynamic library \"%s\".", dynlib_mod_idx, de->fname);
return 0;
} else {
de->func_operate = (func_operate_t)(void*)operate;
}
inform = __LOADSYM(dynamic_library,"inform_super");
if (inform == NULL) {
log_dlerror();
log_err("dynlibmod[%d]: unable to load inform_super procedure from dynamic library \"%s\".", dynlib_mod_idx, de->fname);
return 0;
} else {
de->func_inform = (func_inform_t)(void*)inform;
}
clear = __LOADSYM(dynamic_library,"clear");
if (clear == NULL) {
log_dlerror();
log_err("dynlibmod[%d]: unable to load clear procedure from dynamic library \"%s\".", dynlib_mod_idx, de->fname);
return 0;
} else {
de->func_clear = (func_clear_t)(void*)clear;
}
get_mem = __LOADSYM(dynamic_library,"get_mem");
if (get_mem == NULL) {
log_dlerror();
log_err("dynlibmod[%d]: unable to load get_mem procedure from dynamic library \"%s\".", dynlib_mod_idx, de->fname);
return 0;
} else {
de->func_get_mem = (func_get_mem_t)(void*)get_mem;
}
}
de->inplace_cb_delete_wrapped = &inplace_cb_delete_wrapped;
de->inplace_cb_register_wrapped = &inplace_cb_register_wrapped;
return de->func_init(env, id);
}
/** dynlib module deinit */
void dynlibmod_deinit(struct module_env* env, int id) {
struct dynlibmod_env* de = env->modinfo[id];
if(de == NULL)
return;
de->func_deinit(env, id);
close_library(de->fname, (__DYNMOD)de->dynamic_library);
dynlib_mod_count--;
de->fname = NULL;
free(de);
}
/** dynlib module operate on a query */
void dynlibmod_operate(struct module_qstate* qstate, enum module_ev event,
int id, struct outbound_entry* outbound) {
struct dynlibmod_env* de = qstate->env->modinfo[id];
de->func_operate(qstate, event, id, outbound);
}
/** dynlib module */
void dynlibmod_inform_super(struct module_qstate* qstate, int id,
struct module_qstate* super) {
struct dynlibmod_env* de = qstate->env->modinfo[id];
de->func_inform(qstate, id, super);
}
/** dynlib module cleanup query state */
void dynlibmod_clear(struct module_qstate* qstate, int id) {
struct dynlibmod_env* de = qstate->env->modinfo[id];
de->func_clear(qstate, id);
}
/** dynlib module alloc size routine */
size_t dynlibmod_get_mem(struct module_env* env, int id) {
struct dynlibmod_env* de = (struct dynlibmod_env*)env->modinfo[id];
size_t size;
verbose(VERB_ALGO, "dynlibmod: get_mem, id: %d, de:%p", id, de);
if(!de)
return 0;
size = de->func_get_mem(env, id);
return size + sizeof(*de);
}
int dynlib_inplace_cb_reply_generic(struct query_info* qinfo,
struct module_qstate* qstate, struct reply_info* rep, int rcode,
struct edns_data* edns, struct edns_option** opt_list_out,
struct comm_reply* repinfo, struct regional* region,
struct timeval* start_time, int id, void* callback) {
struct cb_pair* cb_pair = (struct cb_pair*) callback;
return ((inplace_cb_reply_func_type*) cb_pair->cb)(qinfo, qstate, rep, rcode, edns, opt_list_out, repinfo, region, start_time, id, cb_pair->cb_arg);
}
int dynlib_inplace_cb_query_generic(struct query_info* qinfo, uint16_t flags,
struct module_qstate* qstate, struct sockaddr_storage* addr,
socklen_t addrlen, uint8_t* zone, size_t zonelen, struct regional* region,
int id, void* callback) {
struct cb_pair* cb_pair = (struct cb_pair*) callback;
return ((inplace_cb_query_func_type*) cb_pair->cb)(qinfo, flags, qstate, addr, addrlen, zone, zonelen, region, id, cb_pair->cb_arg);
}
int dynlib_inplace_cb_edns_back_parsed(struct module_qstate* qstate,
int id, void* cb_args) {
struct cb_pair* cb_pair = (struct cb_pair*) cb_args;
return ((inplace_cb_edns_back_parsed_func_type*) cb_pair->cb)(qstate, id, cb_pair->cb_arg);
}
int dynlib_inplace_cb_query_response(struct module_qstate* qstate,
struct dns_msg* response, int id, void* cb_args) {
struct cb_pair* cb_pair = (struct cb_pair*) cb_args;
return ((inplace_cb_query_response_func_type*) cb_pair->cb)(qstate, response, id, cb_pair->cb_arg);
}
int
inplace_cb_register_wrapped(void* cb, enum inplace_cb_list_type type, void* cbarg,
struct module_env* env, int id) {
struct cb_pair* cb_pair = malloc(sizeof(struct cb_pair));
if(cb_pair == NULL) {
log_err("dynlibmod[%d]: malloc failure", id);
return 0;
}
cb_pair->cb = cb;
cb_pair->cb_arg = cbarg;
if(type >= inplace_cb_reply && type <= inplace_cb_reply_servfail) {
return inplace_cb_register(&dynlib_inplace_cb_reply_generic, type, (void*) cb_pair, env, id);
} else if(type == inplace_cb_query) {
return inplace_cb_register(&dynlib_inplace_cb_query_generic, type, (void*) cb_pair, env, id);
} else if(type == inplace_cb_query_response) {
return inplace_cb_register(&dynlib_inplace_cb_query_response, type, (void*) cb_pair, env, id);
} else if(type == inplace_cb_edns_back_parsed) {
return inplace_cb_register(&dynlib_inplace_cb_edns_back_parsed, type, (void*) cb_pair, env, id);
} else {
free(cb_pair);
return 0;
}
}
void
inplace_cb_delete_wrapped(struct module_env* env, enum inplace_cb_list_type type,
int id) {
struct inplace_cb* temp = env->inplace_cb_lists[type];
struct inplace_cb* prev = NULL;
while(temp) {
if(temp->id == id) {
if(!prev) {
env->inplace_cb_lists[type] = temp->next;
free(temp->cb_arg);
free(temp);
temp = env->inplace_cb_lists[type];
}
else {
prev->next = temp->next;
free(temp->cb_arg);
free(temp);
temp = prev->next;
}
}
else {
prev = temp;
temp = temp->next;
}
}
}
/**
* The module function block
*/
static struct module_func_block dynlibmod_block = {
"dynlib",
&dynlibmod_init, &dynlibmod_deinit, NULL, NULL, &dynlibmod_operate,
&dynlibmod_inform_super, &dynlibmod_clear, &dynlibmod_get_mem
};
struct module_func_block* dynlibmod_get_funcblock(void)
{
return &dynlibmod_block;
}
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