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 /* 35 * netname utility routines 36 * convert from unix names to network names and vice-versa 37 * This module is operating system dependent! 38 * What we define here will work with any unix system that has adopted 39 * the sun NIS domain architecture. 40 */ 41 42 #include "namespace.h" 43 #include <sys/param.h> 44 #include <rpc/rpc.h> 45 #include <rpc/rpc_com.h> 46 #ifdef YP 47 #include <rpcsvc/yp_prot.h> 48 #include <rpcsvc/ypclnt.h> 49 #endif 50 #include <ctype.h> 51 #include <limits.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 #include "un-namespace.h" 57 58 #ifndef MAXHOSTNAMELEN 59 #define MAXHOSTNAMELEN 256 60 #endif 61 62 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) 63 64 #define TYPE_SIGNED(type) (((type) -1) < 0) 65 66 /* 67 ** 302 / 1000 is log10(2.0) rounded up. 68 ** Subtract one for the sign bit if the type is signed; 69 ** add one for integer division truncation; 70 ** add one more for a minus sign if the type is signed. 71 */ 72 #define INT_STRLEN_MAXIMUM(type) \ 73 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type)) 74 75 static char *OPSYS = "unix"; 76 77 /* 78 * Figure out my fully qualified network name 79 */ 80 int 81 getnetname(char name[MAXNETNAMELEN+1]) 82 { 83 uid_t uid; 84 85 uid = geteuid(); 86 if (uid == 0) { 87 return (host2netname(name, (char *) NULL, (char *) NULL)); 88 } else { 89 return (user2netname(name, uid, (char *) NULL)); 90 } 91 } 92 93 94 /* 95 * Convert unix cred to network-name 96 */ 97 int 98 user2netname(char netname[MAXNETNAMELEN + 1], const uid_t uid, const char *domain) 99 { 100 char *dfltdom; 101 102 if (domain == NULL) { 103 if (__rpc_get_default_domain(&dfltdom) != 0) { 104 return (0); 105 } 106 domain = dfltdom; 107 } 108 if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 109 return (0); 110 } 111 (void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain); 112 return (1); 113 } 114 115 116 /* 117 * Convert host to network-name 118 */ 119 int 120 host2netname(char netname[MAXNETNAMELEN + 1], const char *host, const char *domain) 121 { 122 char *dfltdom; 123 char hostname[MAXHOSTNAMELEN+1]; 124 125 if (domain == NULL) { 126 if (__rpc_get_default_domain(&dfltdom) != 0) { 127 return (0); 128 } 129 domain = dfltdom; 130 } 131 if (host == NULL) { 132 (void) gethostname(hostname, sizeof(hostname)); 133 host = hostname; 134 } 135 if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 136 return (0); 137 } 138 (void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain); 139 return (1); 140 } 141