npf_extmod.c revision 1.3.2.2
1 1.3.2.2 riz /* $NetBSD: npf_extmod.c,v 1.3.2.2 2012/11/18 22:38:28 riz Exp $ */ 2 1.3.2.2 riz 3 1.3.2.2 riz /*- 4 1.3.2.2 riz * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 1.3.2.2 riz * All rights reserved. 6 1.3.2.2 riz * 7 1.3.2.2 riz * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 riz * by Mindaugas Rasiukevicius. 9 1.3.2.2 riz * 10 1.3.2.2 riz * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 riz * modification, are permitted provided that the following conditions 12 1.3.2.2 riz * are met: 13 1.3.2.2 riz * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 riz * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 riz * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 riz * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 riz * documentation and/or other materials provided with the distribution. 18 1.3.2.2 riz * 19 1.3.2.2 riz * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.2.2 riz * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.2.2 riz * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.2.2 riz * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.2.2 riz * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.2.2 riz * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.2.2 riz * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.2.2 riz * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.2.2 riz * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.2.2 riz * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.2.2 riz * POSSIBILITY OF SUCH DAMAGE. 30 1.3.2.2 riz */ 31 1.3.2.2 riz 32 1.3.2.2 riz /* 33 1.3.2.2 riz * npfctl(8) extension loading interface. 34 1.3.2.2 riz */ 35 1.3.2.2 riz 36 1.3.2.2 riz #include <sys/cdefs.h> 37 1.3.2.2 riz __RCSID("$NetBSD: npf_extmod.c,v 1.3.2.2 2012/11/18 22:38:28 riz Exp $"); 38 1.3.2.2 riz 39 1.3.2.2 riz #include <stdlib.h> 40 1.3.2.2 riz #include <inttypes.h> 41 1.3.2.2 riz #include <string.h> 42 1.3.2.2 riz #include <err.h> 43 1.3.2.2 riz #include <dlfcn.h> 44 1.3.2.2 riz 45 1.3.2.2 riz #include "npfctl.h" 46 1.3.2.2 riz 47 1.3.2.2 riz struct npf_extmod { 48 1.3.2.2 riz char * name; 49 1.3.2.2 riz npfext_initfunc_t init; 50 1.3.2.2 riz npfext_consfunc_t cons; 51 1.3.2.2 riz npfext_paramfunc_t param; 52 1.3.2.2 riz struct npf_extmod * next; 53 1.3.2.2 riz }; 54 1.3.2.2 riz 55 1.3.2.2 riz static npf_extmod_t * npf_extmod_list; 56 1.3.2.2 riz 57 1.3.2.2 riz static void * 58 1.3.2.2 riz npf_extmod_sym(void *handle, const char *name, const char *func) 59 1.3.2.2 riz { 60 1.3.2.2 riz char buf[64]; 61 1.3.2.2 riz void *sym; 62 1.3.2.2 riz 63 1.3.2.2 riz snprintf(buf, sizeof(buf), "npfext_%s_%s", name, func); 64 1.3.2.2 riz sym = dlsym(handle, buf); 65 1.3.2.2 riz if (sym == NULL) { 66 1.3.2.2 riz errx(EXIT_FAILURE, "dlsym: %s", dlerror()); 67 1.3.2.2 riz } 68 1.3.2.2 riz return sym; 69 1.3.2.2 riz } 70 1.3.2.2 riz 71 1.3.2.2 riz static npf_extmod_t * 72 1.3.2.2 riz npf_extmod_load(const char *name) 73 1.3.2.2 riz { 74 1.3.2.2 riz npf_extmod_t *ext; 75 1.3.2.2 riz void *handle; 76 1.3.2.2 riz char extlib[PATH_MAX]; 77 1.3.2.2 riz 78 1.3.2.2 riz snprintf(extlib, sizeof(extlib), "/usr/lib/npf/ext_%s.so", name); 79 1.3.2.2 riz handle = dlopen(extlib, RTLD_LAZY | RTLD_LOCAL); 80 1.3.2.2 riz if (handle == NULL) { 81 1.3.2.2 riz errx(EXIT_FAILURE, "dlopen: %s", dlerror()); 82 1.3.2.2 riz } 83 1.3.2.2 riz 84 1.3.2.2 riz ext = zalloc(sizeof(npf_extmod_t)); 85 1.3.2.2 riz ext->name = xstrdup(name); 86 1.3.2.2 riz ext->init = npf_extmod_sym(handle, name, "init"); 87 1.3.2.2 riz ext->cons = npf_extmod_sym(handle, name, "construct"); 88 1.3.2.2 riz ext->param = npf_extmod_sym(handle, name, "param"); 89 1.3.2.2 riz 90 1.3.2.2 riz /* Initialise the module. */ 91 1.3.2.2 riz if (ext->init() != 0) { 92 1.3.2.2 riz free(ext); 93 1.3.2.2 riz return NULL; 94 1.3.2.2 riz } 95 1.3.2.2 riz 96 1.3.2.2 riz ext->next = npf_extmod_list; 97 1.3.2.2 riz npf_extmod_list = ext; 98 1.3.2.2 riz return ext; 99 1.3.2.2 riz } 100 1.3.2.2 riz 101 1.3.2.2 riz npf_extmod_t * 102 1.3.2.2 riz npf_extmod_get(const char *name, nl_ext_t **extcall) 103 1.3.2.2 riz { 104 1.3.2.2 riz npf_extmod_t *extmod = npf_extmod_list; 105 1.3.2.2 riz 106 1.3.2.2 riz while (extmod) { 107 1.3.2.2 riz if ((strcmp(extmod->name, name) == 0) && 108 1.3.2.2 riz (*extcall = extmod->cons(name)) != NULL) { 109 1.3.2.2 riz return extmod; 110 1.3.2.2 riz } 111 1.3.2.2 riz extmod = extmod->next; 112 1.3.2.2 riz } 113 1.3.2.2 riz 114 1.3.2.2 riz extmod = npf_extmod_load(name); 115 1.3.2.2 riz if (extmod && (*extcall = extmod->cons(name)) != NULL) { 116 1.3.2.2 riz return extmod; 117 1.3.2.2 riz } 118 1.3.2.2 riz 119 1.3.2.2 riz return NULL; 120 1.3.2.2 riz } 121 1.3.2.2 riz 122 1.3.2.2 riz int 123 1.3.2.2 riz npf_extmod_param(npf_extmod_t *extmod, nl_ext_t *ext, 124 1.3.2.2 riz const char *param, const char *val) 125 1.3.2.2 riz { 126 1.3.2.2 riz return extmod->param(ext, param, val); 127 1.3.2.2 riz } 128
Indexes created Wed Oct 22 00:09:40 GMT 2025