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 /* 36 * netname utility routines 37 * convert from unix names to network names and vice-versa 38 * This module is operating system dependent! 39 * What we define here will work with any unix system that has adopted 40 * the sun NIS domain architecture. 41 */ 42 43 #include "namespace.h" 44 #include <sys/param.h> 45 #include <rpc/rpc.h> 46 #include <rpc/rpc_com.h> 47 #ifdef YP 48 #include <rpcsvc/yp_prot.h> 49 #include <rpcsvc/ypclnt.h> 50 #endif 51 #include <ctype.h> 52 #include <limits.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include "un-namespace.h" 58 59 #ifndef MAXHOSTNAMELEN 60 #define MAXHOSTNAMELEN 256 61 #endif 62 63 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) 64 65 #define TYPE_SIGNED(type) (((type) -1) < 0) 66 67 /* 68 ** 302 / 1000 is log10(2.0) rounded up. 69 ** Subtract one for the sign bit if the type is signed; 70 ** add one for integer division truncation; 71 ** add one more for a minus sign if the type is signed. 72 */ 73 #define INT_STRLEN_MAXIMUM(type) \ 74 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type)) 75 76 static char *OPSYS = "unix"; 77 78 /* 79 * Figure out my fully qualified network name 80 */ 81 int 82 getnetname(char name[MAXNETNAMELEN+1]) 83 { 84 uid_t uid; 85 86 uid = geteuid(); 87 if (uid == 0) { 88 return (host2netname(name, (char *) NULL, (char *) NULL)); 89 } else { 90 return (user2netname(name, uid, (char *) NULL)); 91 } 92 } 93 94 95 /* 96 * Convert unix cred to network-name 97 */ 98 int 99 user2netname(char netname[MAXNETNAMELEN + 1], const uid_t uid, const char *domain) 100 { 101 char *dfltdom; 102 103 if (domain == NULL) { 104 if (__rpc_get_default_domain(&dfltdom) != 0) { 105 return (0); 106 } 107 domain = dfltdom; 108 } 109 if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 110 return (0); 111 } 112 (void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain); 113 return (1); 114 } 115 116 117 /* 118 * Convert host to network-name 119 */ 120 int 121 host2netname(char netname[MAXNETNAMELEN + 1], const char *host, const char *domain) 122 { 123 char *dfltdom; 124 char hostname[MAXHOSTNAMELEN+1]; 125 126 if (domain == NULL) { 127 if (__rpc_get_default_domain(&dfltdom) != 0) { 128 return (0); 129 } 130 domain = dfltdom; 131 } 132 if (host == NULL) { 133 (void) gethostname(hostname, sizeof(hostname)); 134 host = hostname; 135 } 136 if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 137 return (0); 138 } 139 (void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain); 140 return (1); 141 } 142