npf_extmod.c revision 1.1.2.2
1 1.1.2.2 yamt /* $NetBSD: npf_extmod.c,v 1.1.2.2 2012/10/30 19:00:43 yamt Exp $ */ 2 1.1.2.2 yamt 3 1.1.2.2 yamt /*- 4 1.1.2.2 yamt * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 1.1.2.2 yamt * All rights reserved. 6 1.1.2.2 yamt * 7 1.1.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 yamt * by Mindaugas Rasiukevicius. 9 1.1.2.2 yamt * 10 1.1.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 yamt * modification, are permitted provided that the following conditions 12 1.1.2.2 yamt * are met: 13 1.1.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.1.2.2 yamt * 19 1.1.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.1.2.2 yamt */ 31 1.1.2.2 yamt 32 1.1.2.2 yamt /* 33 1.1.2.2 yamt * npfctl(8) extension loading interface. 34 1.1.2.2 yamt */ 35 1.1.2.2 yamt 36 1.1.2.2 yamt #include <sys/cdefs.h> 37 1.1.2.2 yamt __RCSID("$NetBSD: npf_extmod.c,v 1.1.2.2 2012/10/30 19:00:43 yamt Exp $"); 38 1.1.2.2 yamt 39 1.1.2.2 yamt #include <stdlib.h> 40 1.1.2.2 yamt #include <inttypes.h> 41 1.1.2.2 yamt #include <string.h> 42 1.1.2.2 yamt #include <err.h> 43 1.1.2.2 yamt #include <dlfcn.h> 44 1.1.2.2 yamt 45 1.1.2.2 yamt #include "npfctl.h" 46 1.1.2.2 yamt 47 1.1.2.2 yamt struct npf_extmod { 48 1.1.2.2 yamt char * name; 49 1.1.2.2 yamt npfext_initfunc_t init; 50 1.1.2.2 yamt npfext_consfunc_t cons; 51 1.1.2.2 yamt npfext_paramfunc_t param; 52 1.1.2.2 yamt struct npf_extmod * next; 53 1.1.2.2 yamt }; 54 1.1.2.2 yamt 55 1.1.2.2 yamt static npf_extmod_t * npf_extmod_list; 56 1.1.2.2 yamt 57 1.1.2.2 yamt static void * 58 1.1.2.2 yamt npf_extmod_sym(void *handle, const char *name, const char *func) 59 1.1.2.2 yamt { 60 1.1.2.2 yamt char buf[64]; 61 1.1.2.2 yamt void *sym; 62 1.1.2.2 yamt 63 1.1.2.2 yamt snprintf(buf, sizeof(buf), "npfext_%s_%s", name, func); 64 1.1.2.2 yamt sym = dlsym(handle, buf); 65 1.1.2.2 yamt if (sym == NULL) { 66 1.1.2.2 yamt errx(EXIT_FAILURE, "dlsym: %s", dlerror()); 67 1.1.2.2 yamt } 68 1.1.2.2 yamt return sym; 69 1.1.2.2 yamt } 70 1.1.2.2 yamt 71 1.1.2.2 yamt static npf_extmod_t * 72 1.1.2.2 yamt npf_extmod_load(const char *name) 73 1.1.2.2 yamt { 74 1.1.2.2 yamt npf_extmod_t *ext; 75 1.1.2.2 yamt void *handle; 76 1.1.2.2 yamt char extlib[PATH_MAX]; 77 1.1.2.2 yamt 78 1.1.2.2 yamt snprintf(extlib, sizeof(extlib), "/usr/lib/npf/ext_%s.so", name); 79 1.1.2.2 yamt handle = dlopen(extlib, RTLD_LAZY | RTLD_LOCAL); 80 1.1.2.2 yamt if (handle == NULL) { 81 1.1.2.2 yamt errx(EXIT_FAILURE, "dlopen: %s", dlerror()); 82 1.1.2.2 yamt } 83 1.1.2.2 yamt 84 1.1.2.2 yamt ext = zalloc(sizeof(npf_extmod_t)); 85 1.1.2.2 yamt ext->name = xstrdup(name); 86 1.1.2.2 yamt ext->init = npf_extmod_sym(handle, name, "init"); 87 1.1.2.2 yamt ext->cons = npf_extmod_sym(handle, name, "construct"); 88 1.1.2.2 yamt ext->param = npf_extmod_sym(handle, name, "param"); 89 1.1.2.2 yamt 90 1.1.2.2 yamt /* Initialise the module. */ 91 1.1.2.2 yamt if (ext->init() != 0) { 92 1.1.2.2 yamt free(ext); 93 1.1.2.2 yamt return NULL; 94 1.1.2.2 yamt } 95 1.1.2.2 yamt 96 1.1.2.2 yamt ext->next = npf_extmod_list; 97 1.1.2.2 yamt npf_extmod_list = ext; 98 1.1.2.2 yamt return ext; 99 1.1.2.2 yamt } 100 1.1.2.2 yamt 101 1.1.2.2 yamt npf_extmod_t * 102 1.1.2.2 yamt npf_extmod_get(const char *name, nl_ext_t **extcall) 103 1.1.2.2 yamt { 104 1.1.2.2 yamt npf_extmod_t *extmod = npf_extmod_list; 105 1.1.2.2 yamt 106 1.1.2.2 yamt while (extmod) { 107 1.1.2.2 yamt if ((strcmp(extmod->name, name) == 0) && 108 1.1.2.2 yamt (*extcall = extmod->cons(name)) != NULL) { 109 1.1.2.2 yamt return extmod; 110 1.1.2.2 yamt } 111 1.1.2.2 yamt extmod = extmod->next; 112 1.1.2.2 yamt } 113 1.1.2.2 yamt 114 1.1.2.2 yamt extmod = npf_extmod_load(name); 115 1.1.2.2 yamt if (extmod && (*extcall = extmod->cons(name)) != NULL) { 116 1.1.2.2 yamt return extmod; 117 1.1.2.2 yamt } 118 1.1.2.2 yamt 119 1.1.2.2 yamt return NULL; 120 1.1.2.2 yamt } 121 1.1.2.2 yamt 122 1.1.2.2 yamt int 123 1.1.2.2 yamt npf_extmod_param(npf_extmod_t *extmod, nl_ext_t *ext, 124 1.1.2.2 yamt const char *param, const char *val) 125 1.1.2.2 yamt { 126 1.1.2.2 yamt return extmod->param(ext, param, val); 127 1.1.2.2 yamt } 128
Indexes created Thu Oct 23 22:10:10 GMT 2025