1 /* $NetBSD: nsdispatch.c,v 1.30 2005/11/29 03:11:59 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 1999, 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn; and by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /*- 40 * Copyright (c) 2003 Networks Associates Technology, Inc. 41 * All rights reserved. 42 * 43 * Portions of this software were developed for the FreeBSD Project by 44 * Jacques A. Vidrine, Safeport Network Services, and Network 45 * Associates Laboratories, the Security Research Division of Network 46 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 47 * ("CBOSS"), as part of the DARPA CHATS research program. 48 * 49 * Redistribution and use in source and binary forms, with or without 50 * modification, are permitted provided that the following conditions 51 * are met: 52 * 1. Redistributions of source code must retain the above copyright 53 * notice, this list of conditions and the following disclaimer. 54 * 2. Redistributions in binary form must reproduce the above copyright 55 * notice, this list of conditions and the following disclaimer in the 56 * documentation and/or other materials provided with the distribution. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 */ 70 71 #include <sys/cdefs.h> 72 #include <sys/types.h> 73 #include <sys/param.h> 74 #include <sys/stat.h> 75 76 #include <assert.h> 77 #ifdef __ELF__ 78 #include <dlfcn.h> 79 #endif /* __ELF__ */ 80 #include <fcntl.h> 81 #define _NS_PRIVATE 82 #include <nsswitch.h> 83 #include <stdarg.h> 84 #include <stdio.h> 85 #include <stdlib.h> 86 #include <string.h> 87 #include <unistd.h> 88 89 static nss_method _nsmethod(const char * source,const char * database,const char * method,const ns_dtab disp_tab[],void ** cb_data)90 _nsmethod(const char *source, const char *database, const char *method, 91 const ns_dtab disp_tab[], void **cb_data) 92 { 93 int curdisp; 94 95 if (disp_tab != NULL) { 96 for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++) { 97 if (strcasecmp(source, disp_tab[curdisp].src) == 0) { 98 *cb_data = disp_tab[curdisp].cb_data; 99 return (disp_tab[curdisp].callback); 100 } 101 } 102 } 103 104 *cb_data = NULL; 105 return (NULL); 106 } 107 108 int 109 /*ARGSUSED*/ nsdispatch(void * retval,const ns_dtab disp_tab[],const char * database,const char * method,const ns_src defaults[],...)110 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database, 111 const char *method, const ns_src defaults[], ...) 112 { 113 va_list ap; 114 int i, result; 115 const ns_src *srclist; 116 int srclistsize; 117 nss_method cb; 118 void *cb_data; 119 120 /* retval may be NULL */ 121 /* disp_tab may be NULL */ 122 assert(database != NULL); 123 assert(method != NULL); 124 assert(defaults != NULL); 125 if (database == NULL || method == NULL || defaults == NULL) 126 return (NS_UNAVAIL); 127 128 srclist = defaults; 129 srclistsize = 0; 130 while (srclist[srclistsize].name != NULL) 131 srclistsize++; 132 133 result = 0; 134 135 for (i = 0; i < srclistsize; i++) { 136 cb = _nsmethod(srclist[i].name, database, method, 137 disp_tab, &cb_data); 138 result = 0; 139 if (cb != NULL) { 140 va_start(ap, defaults); 141 result = (*cb)(retval, cb_data, ap); 142 va_end(ap); 143 if (defaults[0].flags & NS_FORCEALL) 144 continue; 145 if (result & srclist[i].flags) 146 break; 147 } 148 } 149 result &= NS_STATUSMASK; /* clear private flags in result */ 150 151 return (result ? result : NS_NOTFOUND); 152 } 153