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/*
Copyright (C) 2019 Red Hat
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 3 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/>.
*/
#include <dlfcn.h>
#include <talloc.h>
#include <stdbool.h>
#include <errno.h>
#include "util/util_errors.h"
#include "util/debug.h"
#include "nss_dl_load.h"
#define NSS_FN_NAME "_nss_%s_%s"
static void *proxy_dlsym(void *handle,
const char *name,
const char *libname)
{
char *funcname;
void *funcptr;
funcname = talloc_asprintf(NULL, NSS_FN_NAME, libname, name);
if (funcname == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "talloc_asprintf() failed\n");
return NULL;
}
funcptr = dlsym(handle, funcname);
talloc_free(funcname);
return funcptr;
}
errno_t sss_load_nss_symbols(struct sss_nss_ops *ops, const char *libname,
struct sss_nss_symbols *syms, size_t nsyms)
{
errno_t ret;
char *libpath;
size_t i;
libpath = talloc_asprintf(NULL, "libnss_%s.so.2", libname);
if (libpath == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "talloc_asprintf() failed\n");
return ENOMEM;
}
ops->dl_handle = dlopen(libpath, RTLD_NOW);
if (ops->dl_handle == NULL) {
DEBUG(SSSDBG_FATAL_FAILURE, "Unable to load %s module, "
"error: %s\n", libpath, dlerror());
ret = ELIBACC;
goto out;
}
for (i = 0; i < nsyms; i++) {
*(syms[i].fptr) = proxy_dlsym(ops->dl_handle, syms[i].fname,
libname);
if (*(syms[i].fptr) == NULL) {
if (syms[i].mandatory) {
DEBUG(SSSDBG_FATAL_FAILURE, "Library '%s' did not provide "
"mandatory symbol '%s', error: %s.\n", libpath,
syms[i].fname, dlerror());
ret = ELIBBAD;
goto out;
} else {
DEBUG(SSSDBG_OP_FAILURE, "Library '%s' did not provide "
"optional symbol '%s', error: %s.\n", libpath,
syms[i].fname, dlerror());
}
}
}
ret = EOK;
out:
talloc_free(libpath);
return ret;
}
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