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 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 * 25 * files/netmasks.c -- "files" backend for nsswitch "netmasks" database 26 */ 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 29 30 /* 31 * All routines necessary to deal with the file /etc/inet/netmasks. The file 32 * contains mappings from 32 bit network internet addresses to their 33 * corresponding 32 bit mask internet addresses. The addresses are in dotted 34 * internet address form. 35 */ 36 37 #include "files_common.h" 38 #include <string.h> 39 #include <sys/types.h> 40 #include <sys/socket.h> 41 #include <net/if.h> 42 #include <netinet/in.h> 43 #include <arpa/inet.h> 44 #include <nss_dbdefs.h> 45 #include <ctype.h> 46 47 /* 48 * Validate 'files' netmasks entry. The comparison objects are in IPv4 49 * internet address format. 50 */ 51 static int 52 check_addr(nss_XbyY_args_t *argp, const char *line, int linelen) 53 { 54 const char *limit, *linep, *addrstart; 55 int addrlen; 56 char addrbuf[NSS_LINELEN_NETMASKS]; 57 struct in_addr lineaddr, argsaddr; 58 59 linep = line; 60 limit = line + linelen; 61 62 /* skip leading spaces */ 63 while (linep < limit && isspace(*linep)) 64 linep++; 65 66 addrstart = linep; 67 while (linep < limit && !isspace(*linep)) 68 linep++; 69 if (linep == limit) 70 return (0); 71 addrlen = linep - addrstart; 72 if (addrlen < sizeof (addrbuf)) { 73 (void) memcpy(addrbuf, addrstart, addrlen); 74 addrbuf[addrlen] = '\0'; 75 if ((lineaddr.s_addr = inet_addr(addrbuf)) == 76 (in_addr_t)0xffffffffU) 77 return (0); 78 if ((argsaddr.s_addr = inet_addr(argp->key.name)) 79 == (in_addr_t)0xffffffffU) 80 return (0); 81 return (lineaddr.s_addr == argsaddr.s_addr); 82 } 83 return (0); 84 } 85 86 static nss_status_t 87 getbynet(be, a) 88 files_backend_ptr_t be; 89 void *a; 90 { 91 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a; 92 nss_status_t res; 93 char tmpbuf[NSS_LINELEN_NETMASKS]; 94 95 /* 96 * use the buffer passed in if result is to be returned 97 * in /etc file format 98 */ 99 if (argp->buf.result != NULL) { 100 argp->buf.buffer = tmpbuf; 101 argp->buf.buflen = NSS_LINELEN_NETMASKS; 102 } 103 res = _nss_files_XY_all(be, argp, 0, argp->key.name, check_addr); 104 if (argp->buf.result != NULL) { 105 argp->buf.buffer = NULL; 106 argp->buf.buflen = 0; 107 } else { 108 /* the frontend expects the netmask data only */ 109 if (res == NSS_SUCCESS) { 110 char *m; 111 char *s = (char *)argp->returnval; 112 int l = 0; 113 114 m = s + argp->returnlen - 1; 115 116 /* skip trailing spaces */ 117 while (s < m && isspace(*m)) 118 m--; 119 120 for (; s <= m; m--) { 121 if (isspace(*m)) 122 break; 123 l++; 124 } 125 m++; 126 (void) memmove(argp->returnval, m, l); 127 argp->returnlen = l; 128 *(s + l) = '\0'; 129 } 130 } 131 132 return (res); 133 } 134 135 static files_backend_op_t netmasks_ops[] = { 136 _nss_files_destr, 137 getbynet 138 }; 139 140 /*ARGSUSED*/ 141 nss_backend_t * 142 _nss_files_netmasks_constr(dummy1, dummy2, dummy3) 143 const char *dummy1, *dummy2, *dummy3; 144 { 145 return (_nss_files_constr(netmasks_ops, 146 sizeof (netmasks_ops) / sizeof (netmasks_ops[0]), 147 _PATH_NETMASKS, NSS_LINELEN_NETMASKS, NULL)); 148 } 149