1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #if defined(LIBC_SCCS) && !defined(lint) 32 static char sccsid[] = "@(#)netname.c 1.8 91/03/11 Copyr 1986 Sun Micro"; 33 #endif 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 /* 38 * netname utility routines 39 * convert from unix names to network names and vice-versa 40 * This module is operating system dependent! 41 * What we define here will work with any unix system that has adopted 42 * the sun NIS domain architecture. 43 */ 44 45 #include "namespace.h" 46 #include <sys/param.h> 47 #include <rpc/rpc.h> 48 #include <rpc/rpc_com.h> 49 #ifdef YP 50 #include <rpcsvc/yp_prot.h> 51 #include <rpcsvc/ypclnt.h> 52 #endif 53 #include <ctype.h> 54 #include <limits.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 #include "un-namespace.h" 60 61 #ifndef MAXHOSTNAMELEN 62 #define MAXHOSTNAMELEN 256 63 #endif 64 65 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) 66 67 #define TYPE_SIGNED(type) (((type) -1) < 0) 68 69 /* 70 ** 302 / 1000 is log10(2.0) rounded up. 71 ** Subtract one for the sign bit if the type is signed; 72 ** add one for integer division truncation; 73 ** add one more for a minus sign if the type is signed. 74 */ 75 #define INT_STRLEN_MAXIMUM(type) \ 76 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type)) 77 78 static char *OPSYS = "unix"; 79 80 /* 81 * Figure out my fully qualified network name 82 */ 83 int 84 getnetname(char name[MAXNETNAMELEN+1]) 85 { 86 uid_t uid; 87 88 uid = geteuid(); 89 if (uid == 0) { 90 return (host2netname(name, (char *) NULL, (char *) NULL)); 91 } else { 92 return (user2netname(name, uid, (char *) NULL)); 93 } 94 } 95 96 97 /* 98 * Convert unix cred to network-name 99 */ 100 int 101 user2netname(char netname[MAXNETNAMELEN + 1], const uid_t uid, const char *domain) 102 { 103 char *dfltdom; 104 105 if (domain == NULL) { 106 if (__rpc_get_default_domain(&dfltdom) != 0) { 107 return (0); 108 } 109 domain = dfltdom; 110 } 111 if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 112 return (0); 113 } 114 (void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain); 115 return (1); 116 } 117 118 119 /* 120 * Convert host to network-name 121 */ 122 int 123 host2netname(char netname[MAXNETNAMELEN + 1], const char *host, const char *domain) 124 { 125 char *dfltdom; 126 char hostname[MAXHOSTNAMELEN+1]; 127 128 if (domain == NULL) { 129 if (__rpc_get_default_domain(&dfltdom) != 0) { 130 return (0); 131 } 132 domain = dfltdom; 133 } 134 if (host == NULL) { 135 (void) gethostname(hostname, sizeof(hostname)); 136 host = hostname; 137 } 138 if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 139 return (0); 140 } 141 (void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain); 142 return (1); 143 } 144