1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user or with the express written consent of 8 * Sun Microsystems, Inc. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 * 30 * $FreeBSD: src/lib/libc/rpc/netname.c,v 1.8 2004/10/16 06:11:35 obrien Exp $ 31 * $DragonFly: src/lib/libc/rpc/netname.c,v 1.3 2005/11/13 12:27:04 swildner Exp $ 32 * 33 * @(#)netname.c 1.8 91/03/11 Copyr 1986 Sun Micro 34 */ 35 36 /* 37 * netname utility routines 38 * convert from unix names to network names and vice-versa 39 * This module is operating system dependent! 40 * What we define here will work with any unix system that has adopted 41 * the sun NIS domain architecture. 42 */ 43 44 #include "namespace.h" 45 #include <sys/param.h> 46 #include <rpc/rpc.h> 47 #include <rpc/rpc_com.h> 48 #ifdef YP 49 #include <rpcsvc/yp_prot.h> 50 #include <rpcsvc/ypclnt.h> 51 #endif 52 #include <ctype.h> 53 #include <limits.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 #include "un-namespace.h" 59 60 #ifndef MAXHOSTNAMELEN 61 #define MAXHOSTNAMELEN 256 62 #endif 63 #ifndef NGROUPS 64 #define NGROUPS 16 65 #endif 66 67 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) 68 69 #define TYPE_SIGNED(type) (((type) -1) < 0) 70 71 /* 72 ** 302 / 1000 is log10(2.0) rounded up. 73 ** Subtract one for the sign bit if the type is signed; 74 ** add one for integer division truncation; 75 ** add one more for a minus sign if the type is signed. 76 */ 77 #define INT_STRLEN_MAXIMUM(type) \ 78 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type)) 79 80 static char *OPSYS = "unix"; 81 82 /* 83 * Figure out my fully qualified network name 84 */ 85 int 86 getnetname(char *name) 87 { 88 uid_t uid; 89 90 uid = geteuid(); 91 if (uid == 0) { 92 return (host2netname(name, NULL, NULL)); 93 } else { 94 return (user2netname(name, uid, NULL)); 95 } 96 } 97 98 99 /* 100 * Convert unix cred to network-name 101 */ 102 int 103 user2netname(char *netname, const uid_t uid, const char *domain) 104 { 105 char *dfltdom; 106 107 if (domain == NULL) { 108 if (__rpc_get_default_domain(&dfltdom) != 0) { 109 return (0); 110 } 111 domain = dfltdom; 112 } 113 if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 114 return (0); 115 } 116 sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain); 117 return (1); 118 } 119 120 121 /* 122 * Convert host to network-name 123 */ 124 int 125 host2netname(char *netname, const char *host, const char *domain) 126 { 127 char *dfltdom; 128 char hostname[MAXHOSTNAMELEN+1]; 129 130 if (domain == NULL) { 131 if (__rpc_get_default_domain(&dfltdom) != 0) { 132 return (0); 133 } 134 domain = dfltdom; 135 } 136 if (host == NULL) { 137 gethostname(hostname, sizeof(hostname)); 138 host = hostname; 139 } 140 if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 141 return (0); 142 } 143 sprintf(netname, "%s.%s@%s", OPSYS, host, domain); 144 return (1); 145 } 146