1 /*- 2 * Copyright (c) 2009, Sun Microsystems, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * - Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * - Neither the name of Sun Microsystems, Inc. nor the names of its 13 * contributors may be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD: src/lib/libc/rpc/netname.c,v 1.8 2004/10/16 06:11:35 obrien Exp $ 29 * 30 * @(#)netname.c 1.8 91/03/11 Copyr 1986 Sun Micro 31 */ 32 33 /* 34 * netname utility routines 35 * convert from unix names to network names and vice-versa 36 * This module is operating system dependent! 37 * What we define here will work with any unix system that has adopted 38 * the sun NIS domain architecture. 39 */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #include <rpc/rpc.h> 44 #include <rpc/rpc_com.h> 45 #ifdef YP 46 #include <rpcsvc/yp_prot.h> 47 #include <rpcsvc/ypclnt.h> 48 #endif 49 #include <ctype.h> 50 #include <limits.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include "un-namespace.h" 56 57 #ifndef MAXHOSTNAMELEN 58 #define MAXHOSTNAMELEN 256 59 #endif 60 #ifndef NGROUPS 61 #define NGROUPS 16 62 #endif 63 64 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) 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 U_INT_STRLEN_MAXIMUM(type) \ 73 (TYPE_BIT(type) * 302 / 1000 + 1) 74 #define S_INT_STRLEN_MAXIMUM(type) \ 75 ((TYPE_BIT(type) - 1) * 302 / 1000 + 1 + 1) 76 77 static char *OPSYS = "unix"; 78 79 /* 80 * Figure out my fully qualified network name 81 */ 82 int 83 getnetname(char *name) 84 { 85 uid_t uid; 86 87 uid = geteuid(); 88 if (uid == 0) { 89 return (host2netname(name, NULL, NULL)); 90 } else { 91 return (user2netname(name, uid, NULL)); 92 } 93 } 94 95 96 /* 97 * Convert unix cred to network-name 98 */ 99 int 100 user2netname(char *netname, const uid_t uid, const char *domain) 101 { 102 char *dfltdom; 103 104 if (domain == NULL) { 105 if (__rpc_get_default_domain(&dfltdom) != 0) { 106 return (0); 107 } 108 domain = dfltdom; 109 } 110 if (strlen(domain) + 1 + U_INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 111 return (0); 112 } 113 sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain); 114 return (1); 115 } 116 117 118 /* 119 * Convert host to network-name 120 */ 121 int 122 host2netname(char *netname, const char *host, const char *domain) 123 { 124 char *dfltdom; 125 char hostname[MAXHOSTNAMELEN+1]; 126 127 if (domain == NULL) { 128 if (__rpc_get_default_domain(&dfltdom) != 0) { 129 return (0); 130 } 131 domain = dfltdom; 132 } 133 if (host == NULL) { 134 gethostname(hostname, sizeof(hostname)); 135 host = hostname; 136 } 137 if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 138 return (0); 139 } 140 sprintf(netname, "%s.%s@%s", OPSYS, host, domain); 141 return (1); 142 } 143