126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Mindaugas Rasiukevicius.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* npfctl(8) extension loading interface.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: npf_extmod.c,v 1.5 2018/09/29 14:41:36 rmind Exp $");
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#include <stdlib.h>
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#include <inttypes.h>
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#include <string.h>
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#include <err.h>
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#include <dlfcn.h>
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#include "npfctl.h"
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struct npf_extmod {
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char * name;
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npfext_initfunc_t init;
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npfext_consfunc_t cons;
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npfext_paramfunc_t param;
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struct npf_extmod * next;
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};
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static npf_extmod_t * npf_extmod_list;
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static void *
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npf_extmod_sym(void *handle, const char *name, const char *func)
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{
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char buf[64];
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void *sym;
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snprintf(buf, sizeof(buf), "npfext_%s_%s", name, func);
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sym = dlsym(handle, buf);
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if (sym == NULL) {
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errx(EXIT_FAILURE, "dlsym: %s", dlerror());
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}
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return sym;
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}
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static npf_extmod_t *
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npf_extmod_load(const char *name)
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{
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npf_extmod_t *ext;
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void *handle;
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char extlib[PATH_MAX];
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snprintf(extlib, sizeof(extlib), "/lib/npf/ext_%s.so", name);
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handle = dlopen(extlib, RTLD_LAZY | RTLD_LOCAL);
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if (handle == NULL) {
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errx(EXIT_FAILURE, "dlopen: %s", dlerror());
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}
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ext = ecalloc(1, sizeof(npf_extmod_t));
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ext->name = estrdup(name);
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ext->init = npf_extmod_sym(handle, name, "init");
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ext->cons = npf_extmod_sym(handle, name, "construct");
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ext->param = npf_extmod_sym(handle, name, "param");
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/* Initialise the module. */
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if (ext->init() != 0) {
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free(ext);
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return NULL;
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}
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ext->next = npf_extmod_list;
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npf_extmod_list = ext;
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return ext;
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}
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npf_extmod_t *
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npf_extmod_get(const char *name, nl_ext_t **extcall)
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{
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npf_extmod_t *extmod = npf_extmod_list;
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while (extmod) {
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if ((strcmp(extmod->name, name) == 0) &&
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(*extcall = extmod->cons(name)) != NULL) {
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return extmod;
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}
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extmod = extmod->next;
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}
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extmod = npf_extmod_load(name);
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if (extmod && (*extcall = extmod->cons(name)) != NULL) {
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return extmod;
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}
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return NULL;
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}
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int
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npf_extmod_param(npf_extmod_t *extmod, nl_ext_t *ext,
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const char *param, const char *val)
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{
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return extmod->param(ext, param, val);
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}
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