1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * files/ether_addr.c -- "files" backend for nsswitch "ethers" database 23 * 24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 29 30 /* 31 * All routines necessary to deal with the file /etc/ethers. The file 32 * contains mappings from 48 bit ethernet addresses to their corresponding 33 * hosts names. The addresses have an ascii representation of the form 34 * "x:x:x:x:x:x" where x is a hex number between 0x00 and 0xff; the 35 * bytes are always in network order. 36 */ 37 38 #include <sys/types.h> 39 #include <sys/socket.h> 40 #include <net/if.h> 41 #include <netinet/in.h> 42 #include <netinet/if_ether.h> 43 #include <nss_dbdefs.h> 44 #include "files_common.h" 45 #include <strings.h> 46 #include <ctype.h> 47 48 #define _PATH_ETHERS "/etc/ethers" 49 #define DIGIT(x) \ 50 (isdigit(x) ? (x) - '0' : islower(x) ? (x) + 10 - 'a' : (x) + 10 - 'A') 51 52 static int 53 check_host(nss_XbyY_args_t *argp, const char *line, int linelen) 54 { 55 const char *limit, *linep, *keyp; 56 linep = line; 57 limit = line + linelen; 58 59 /* skip leading spaces */ 60 while (linep < limit && isspace(*linep)) 61 linep++; 62 /* skip mac address */ 63 while (linep < limit && !isspace(*linep)) 64 linep++; 65 /* skip the delimiting spaces */ 66 while (linep < limit && isspace(*linep)) 67 linep++; 68 if (linep == limit) 69 return (0); 70 71 /* compare the host name */ 72 keyp = argp->key.name; 73 while (*keyp != '\0' && linep < limit && *keyp == *linep) { 74 keyp++; 75 linep++; 76 } 77 return (*keyp == '\0' && linep == limit); 78 } 79 80 static nss_status_t 81 getbyhost(be, a) 82 files_backend_ptr_t be; 83 void *a; 84 { 85 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a; 86 char hostname[MAXHOSTNAMELEN]; 87 nss_status_t res; 88 89 /* 90 * use the buffer passed in if result is to be returned 91 * in /etc file format 92 */ 93 if (argp->buf.result != NULL) { 94 argp->buf.buffer = hostname; 95 argp->buf.buflen = MAXHOSTNAMELEN; 96 } 97 98 res = _nss_files_XY_all(be, argp, 0, argp->key.name, check_host); 99 100 if (argp->buf.result != NULL) { 101 argp->buf.buffer = NULL; 102 argp->buf.buflen = 0; 103 } 104 105 return (res); 106 } 107 108 static int 109 check_ether(nss_XbyY_args_t *argp, const char *line, int linelen) 110 { 111 112 const char *limit, *linep; 113 uchar_t ether[6]; 114 ptrdiff_t i; 115 int n; 116 117 linep = line; 118 limit = line + linelen; 119 120 /* skip leading spaces */ 121 while (linep < limit && isspace(*linep)) 122 linep++; 123 124 for (i = 0; i < 6; i++) { 125 n = 0; 126 while (linep < limit && isxdigit(*linep)) { 127 n = 16 * n + DIGIT(*linep); 128 linep++; 129 } 130 if (*linep != ':' && i < 5) { 131 return (0); 132 } else if (*linep == ':' && i == 5) { 133 return (0); 134 } else { 135 linep++; 136 ether[i] = (uchar_t)n; 137 } 138 } 139 return (ether_cmp((void *)ether, (void *)argp->key.ether) == 0); 140 } 141 142 static nss_status_t 143 getbyether(be, a) 144 files_backend_ptr_t be; 145 void *a; 146 { 147 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a; 148 struct ether_addr etheraddr; 149 nss_status_t res; 150 151 argp->buf.result = ðeraddr; 152 153 res = _nss_files_XY_all(be, argp, 0, NULL, check_ether); 154 155 argp->buf.result = NULL; 156 return (res); 157 } 158 159 static files_backend_op_t ethers_ops[] = { 160 _nss_files_destr, 161 getbyhost, 162 getbyether 163 }; 164 165 /*ARGSUSED*/ 166 nss_backend_t * 167 _nss_files_ethers_constr(dummy1, dummy2, dummy3) 168 const char *dummy1, *dummy2, *dummy3; 169 { 170 return (_nss_files_constr(ethers_ops, 171 sizeof (ethers_ops) / sizeof (ethers_ops[0]), 172 _PATH_ETHERS, 173 NSS_LINELEN_ETHERS, 174 NULL)); 175 } 176