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 /* 32 * netname utility routines 33 * convert from unix names to network names and vice-versa 34 * This module is operating system dependent! 35 * What we define here will work with any unix system that has adopted 36 * the sun NIS domain architecture. 37 */ 38 39 #include "namespace.h" 40 #include <sys/param.h> 41 #include <rpc/rpc.h> 42 #include <rpc/rpc_com.h> 43 #ifdef YP 44 #include <rpcsvc/yp_prot.h> 45 #include <rpcsvc/ypclnt.h> 46 #endif 47 #include <ctype.h> 48 #include <limits.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include "un-namespace.h" 54 55 #ifndef MAXHOSTNAMELEN 56 #define MAXHOSTNAMELEN 256 57 #endif 58 59 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) 60 61 #define TYPE_SIGNED(type) (((type) -1) < 0) 62 63 /* 64 ** 302 / 1000 is log10(2.0) rounded up. 65 ** Subtract one for the sign bit if the type is signed; 66 ** add one for integer division truncation; 67 ** add one more for a minus sign if the type is signed. 68 */ 69 #define INT_STRLEN_MAXIMUM(type) \ 70 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type)) 71 72 static char *OPSYS = "unix"; 73 74 /* 75 * Figure out my fully qualified network name 76 */ 77 int 78 getnetname(char name[MAXNETNAMELEN+1]) 79 { 80 uid_t uid; 81 82 uid = geteuid(); 83 if (uid == 0) { 84 return (host2netname(name, (char *) NULL, (char *) NULL)); 85 } else { 86 return (user2netname(name, uid, (char *) NULL)); 87 } 88 } 89 90 91 /* 92 * Convert unix cred to network-name 93 */ 94 int 95 user2netname(char netname[MAXNETNAMELEN + 1], const uid_t uid, const char *domain) 96 { 97 char *dfltdom; 98 99 if (domain == NULL) { 100 if (__rpc_get_default_domain(&dfltdom) != 0) { 101 return (0); 102 } 103 domain = dfltdom; 104 } 105 if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 106 return (0); 107 } 108 (void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain); 109 return (1); 110 } 111 112 113 /* 114 * Convert host to network-name 115 */ 116 int 117 host2netname(char netname[MAXNETNAMELEN + 1], const char *host, const char *domain) 118 { 119 char *dfltdom; 120 char hostname[MAXHOSTNAMELEN+1]; 121 122 if (domain == NULL) { 123 if (__rpc_get_default_domain(&dfltdom) != 0) { 124 return (0); 125 } 126 domain = dfltdom; 127 } 128 if (host == NULL) { 129 (void) gethostname(hostname, sizeof(hostname)); 130 host = hostname; 131 } 132 if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 133 return (0); 134 } 135 (void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain); 136 return (1); 137 } 138