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1d4ffe42c457b8b5e7f0ac89f9507e7ba9baee31
openairinterface5g/common/utils/load_module_shlib.c
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laurent d6d4d87e0b code review comments
2022-08-18 16:43:26 +02:00

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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/*! \file common/utils/load_module_shlib.c
* \brief shared library loader implementation
* \author Francois TABURET
* \date 2017
* \version 0.1
* \company NOKIA BellLabs France
* \email: francois.taburet@nokia-bell-labs.com
* \note
* \warning
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <dlfcn.h>
#include "openair1/PHY/defs_common.h"
#define LOAD_MODULE_SHLIB_MAIN
#include "common/config/config_userapi.h"
#include "load_module_shlib.h"
void loader_init(void) {
paramdef_t LoaderParams[] = LOADER_PARAMS_DESC;
loader_data.mainexec_buildversion = PACKAGE_VERSION;
int ret = config_get( LoaderParams,sizeof(LoaderParams)/sizeof(paramdef_t),LOADER_CONFIG_PREFIX);
if (ret <0) {
printf("[LOADER] configuration couldn't be performed via config module, parameters set to default values\n");
if (loader_data.shlibpath == NULL) {
loader_data.shlibpath=DEFAULT_PATH;
}
loader_data.maxshlibs = DEFAULT_MAXSHLIBS;
}
loader_data.shlibs = malloc(loader_data.maxshlibs * sizeof(loader_shlibdesc_t));
if(loader_data.shlibs == NULL) {
fprintf(stderr,"[LOADER] %s %d memory allocation error %s\n",__FILE__, __LINE__,strerror(errno));
exit_fun("[LOADER] unrecoverable error");
}
memset(loader_data.shlibs,0,loader_data.maxshlibs * sizeof(loader_shlibdesc_t));
}
/* build the full shared lib name from the module name */
char *loader_format_shlibpath(char *modname, char *version)
{
char *tmpstr;
char *shlibpath =NULL;
char *shlibversion=NULL;
paramdef_t LoaderParams[] ={{"shlibpath", NULL, 0, strptr:&shlibpath, defstrval:NULL, TYPE_STRING, 0, NULL},
{"shlibversion", NULL, 0, strptr:&shlibversion, defstrval:"", TYPE_STRING, 0, NULL}};
int ret;
/* looks for specific path for this module in the config file */
/* specific value for a module path and version is located in a modname subsection of the loader section */
/* shared lib name is formatted as lib<module name><module version>.so */
char cfgprefix[sizeof(LOADER_CONFIG_PREFIX)+strlen(modname)+16];
sprintf(cfgprefix,LOADER_CONFIG_PREFIX ".%s",modname);
ret = config_get( LoaderParams,sizeof(LoaderParams)/sizeof(paramdef_t),cfgprefix);
if (ret <0) {
fprintf(stderr,"[LOADER] %s %d couldn't retrieve config from section %s\n",__FILE__, __LINE__,cfgprefix);
}
/* no specific path, use loader default shared lib path */
if (shlibpath == NULL) {
shlibpath = loader_data.shlibpath ;
}
/* no specific shared lib version */
if (version != NULL) { // version specified as a function parameter
shlibversion=version;
}
if (shlibversion == NULL) { // no specific version specified, neither as a config param or as a function param
shlibversion = "" ;
}
/* alloc memory for full module shared lib file name */
tmpstr = malloc(strlen(shlibpath)+strlen(modname)+strlen(shlibversion)+16);
if (tmpstr == NULL) {
fprintf(stderr,"[LOADER] %s %d malloc error loading module %s, %s\n",__FILE__, __LINE__, modname, strerror(errno));
exit_fun("[LOADER] unrecoverable error");
}
if(shlibpath[0] != 0) {
ret=sprintf(tmpstr,"%s/",shlibpath);
} else {
ret = 0;
}
sprintf(tmpstr+ret,"lib%s%s.so",modname,shlibversion);
return tmpstr;
}
int load_module_version_shlib(char *modname, char *version, loader_shlibfunc_t *farray, int numf, void *autoinit_arg)
{
void *lib_handle = NULL;
initfunc_t fpi;
checkverfunc_t fpc;
getfarrayfunc_t fpg;
char *shlib_path = NULL;
char *afname = NULL;
int ret = 0;
int lib_idx = -1;
if (!modname) {
fprintf(stderr, "[LOADER] load_module_shlib(): no library name given\n");
return -1;
}
if (!loader_data.shlibpath) {
loader_init();
}
shlib_path = loader_format_shlibpath(modname, version);
printf("shlib_path %s\n", shlib_path);
for (int i = 0; i < loader_data.numshlibs; i++) {
if (strcmp(loader_data.shlibs[i].name, modname) == 0) {
printf("[LOADER] library %s has been loaded previously, reloading function pointers\n",
shlib_path);
lib_idx = i;
break;
}
}
if (lib_idx < 0) {
lib_idx = loader_data.numshlibs;
++loader_data.numshlibs;
if (loader_data.numshlibs > loader_data.maxshlibs) {
fprintf(stderr, "[LOADER] can not load more than %d shlibs\n",
loader_data.maxshlibs);
ret = -1;
goto load_module_shlib_exit;
}
loader_data.shlibs[lib_idx].name = strdup(modname);
loader_data.shlibs[lib_idx].thisshlib_path = strdup(shlib_path);
}
lib_handle = dlopen(shlib_path, RTLD_LAZY|RTLD_NODELETE|RTLD_GLOBAL);
if (!lib_handle) {
fprintf(stderr,"[LOADER] library %s is not loaded: %s\n", shlib_path,dlerror());
ret = -1;
goto load_module_shlib_exit;
}
printf("[LOADER] library %s successfully loaded\n", shlib_path);
afname = malloc(strlen(modname)+15);
if (!afname) {
fprintf(stderr, "[LOADER] unable to allocate memory for library %s\n", shlib_path);
ret = -1;
goto load_module_shlib_exit;
}
sprintf(afname,"%s_checkbuildver",modname);
fpc = dlsym(lib_handle,afname);
if (fpc) {
int chkver_ret = fpc(loader_data.mainexec_buildversion,
&(loader_data.shlibs[lib_idx].shlib_buildversion));
if (chkver_ret < 0) {
fprintf(stderr, "[LOADER] %s %d lib %s, version mismatch",
__FILE__, __LINE__, modname);
ret = -1;
goto load_module_shlib_exit;
}
}
sprintf(afname,"%s_autoinit",modname);
fpi = dlsym(lib_handle,afname);
if (fpi) {
fpi(autoinit_arg);
}
if (farray) {
loader_shlibdesc_t *shlib = &loader_data.shlibs[lib_idx];
if (!shlib->funcarray) {
shlib->funcarray = calloc(numf, sizeof(loader_shlibfunc_t));
if (!shlib->funcarray) {
fprintf(stderr, "[LOADER] load_module_shlib(): unable to allocate memory\n");
ret = -1;
goto load_module_shlib_exit;
}
shlib->len_funcarray = numf;
shlib->numfunc = 0;
}
for (int i = 0; i < numf; i++) {
farray[i].fptr = dlsym(lib_handle,farray[i].fname);
if (!farray[i].fptr) {
fprintf(stderr, "[LOADER] load_module_shlib(): function %s not found: %s\n",
farray[i].fname, dlerror());
ret = -1;
goto load_module_shlib_exit;
}
/* check whether this function has been loaded before */
int j = 0;
for (; j < shlib->numfunc; ++j) {
if (shlib->funcarray[j].fptr == farray[i].fptr) {
int rc = strcmp(shlib->funcarray[i].fname, farray[i].fname);
AssertFatal(rc == 0,
"reloading the same fptr with different fnames (%s, %s)\n",
shlib->funcarray[i].fname, farray[i].fname);
break;
}
}
if (j == shlib->numfunc) {
if (shlib->numfunc == shlib->len_funcarray) {
loader_shlibfunc_t *n = realloc(shlib->funcarray, shlib->numfunc * 2 * sizeof(loader_shlibfunc_t));
if (!n) {
fprintf(stderr, "[LOADER] %s(): unable to allocate memory\n", __func__);
ret = -1;
goto load_module_shlib_exit;
}
shlib->funcarray = n;
shlib->len_funcarray = shlib->numfunc * 2;
}
shlib->funcarray[j].fname = strdup(farray[i].fname);
shlib->funcarray[j].fptr = farray[i].fptr;
shlib->numfunc++;
}
} /* for int i... */
} else { /* farray ! NULL */
sprintf(afname,"%s_getfarray",modname);
fpg = dlsym(lib_handle,afname);
if (fpg) {
loader_data.shlibs[lib_idx].numfunc =
fpg(&(loader_data.shlibs[lib_idx].funcarray));
}
} /* farray ! NULL */
load_module_shlib_exit:
if (shlib_path) free(shlib_path);
if (afname) free(afname);
if (lib_handle) dlclose(lib_handle);
return ret;
}
void * get_shlibmodule_fptr(char *modname, char *fname)
{
for (int i=0; i<loader_data.numshlibs && loader_data.shlibs[i].name != NULL; i++) {
if ( strcmp(loader_data.shlibs[i].name, modname) == 0) {
for (int j =0; j<loader_data.shlibs[i].numfunc ; j++) {
if (strcmp(loader_data.shlibs[i].funcarray[j].fname, fname) == 0) {
return loader_data.shlibs[i].funcarray[j].fptr;
}
} /* for j loop on module functions*/
}
} /* for i loop on modules */
return NULL;
}
void loader_reset()
{
for (int i = 0; i < loader_data.numshlibs && loader_data.shlibs[i].name != NULL; i++) {
loader_shlibdesc_t *shlib = &loader_data.shlibs[i];
free(shlib->name);
free(shlib->thisshlib_path);
for (int j = 0; j < shlib->numfunc; ++j)
free(shlib->funcarray[j].fname);
free(shlib->funcarray);
shlib->numfunc = 0;
shlib->len_funcarray = 0;
}
if(loader_data.shlibpath){
free(loader_data.shlibpath);
loader_data.shlibpath=NULL;
}
free(loader_data.shlibs);
}
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