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 73 #include <assert.h> 74 #include <errno.h> 75 #include <nsswitch.h> 76 #include <stdarg.h> 77 #include <strings.h> 78 79 static nss_method 80 _nsmethod(const char *source, const char *database __unused, const char *method __unused, 81 const ns_dtab disp_tab[], void **cb_data) 82 { 83 int curdisp; 84 85 if (disp_tab != NULL) { 86 for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++) { 87 if (strcasecmp(source, disp_tab[curdisp].src) == 0) { 88 *cb_data = disp_tab[curdisp].cb_data; 89 return (disp_tab[curdisp].callback); 90 } 91 } 92 } 93 94 *cb_data = NULL; 95 return (NULL); 96 } 97 98 int 99 /*ARGSUSED*/ 100 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database, 101 const char *method, const ns_src defaults[], ...) 102 { 103 va_list ap; 104 int i, result; 105 const ns_src *srclist; 106 int srclistsize; 107 nss_method cb; 108 void *cb_data; 109 110 /* retval may be NULL */ 111 /* disp_tab may be NULL */ 112 assert(database != NULL); 113 assert(method != NULL); 114 assert(defaults != NULL); 115 if (database == NULL || method == NULL || defaults == NULL) 116 return (NS_UNAVAIL); 117 118 srclist = defaults; 119 srclistsize = 0; 120 while (srclist[srclistsize].name != NULL) 121 srclistsize++; 122 123 result = 0; 124 125 for (i = 0; i < srclistsize; i++) { 126 cb = _nsmethod(srclist[i].name, database, method, 127 disp_tab, &cb_data); 128 result = 0; 129 if (cb != NULL) { 130 va_start(ap, defaults); 131 result = (*cb)(retval, cb_data, ap); 132 va_end(ap); 133 if (defaults[0].flags & NS_FORCEALL) 134 continue; 135 if (result & srclist[i].flags) 136 break; 137 /* Stop trying next resolver when there is a memory space fatal error. */ 138 if ((result & NS_UNAVAIL) != 0 && errno == ENOSPC) { 139 break; 140 } 141 } 142 } 143 result &= NS_STATUSMASK; /* clear private flags in result */ 144 145 return (result ? result : NS_NOTFOUND); 146 } 147
