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 1.2.6.1 2000/08/23 00:05:29 jhb 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 <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 58 #ifndef MAXHOSTNAMELEN 59 #define MAXHOSTNAMELEN 256 60 #endif 61 #ifndef NGROUPS 62 #define NGROUPS 16 63 #endif 64 65 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT) 66 67 #define TYPE_SIGNED(type) (((type) -1) < 0) 68 69 /* 70 ** 302 / 1000 is log10(2.0) rounded up. 71 ** Subtract one for the sign bit if the type is signed; 72 ** add one for integer division truncation; 73 ** add one more for a minus sign if the type is signed. 74 */ 75 #define INT_STRLEN_MAXIMUM(type) \ 76 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type)) 77 78 static char *OPSYS = "unix"; 79 80 /* 81 * Figure out my fully qualified network name 82 */ 83 int 84 getnetname(char *name) 85 { 86 uid_t uid; 87 88 uid = geteuid(); 89 if (uid == 0) { 90 return (host2netname(name, (char *) NULL, (char *) NULL)); 91 } else { 92 return (user2netname(name, uid, (char *) NULL)); 93 } 94 } 95 96 97 /* 98 * Convert unix cred to network-name 99 */ 100 int 101 user2netname(char *netname, uid_t uid, char *domain) 102 { 103 char *dfltdom; 104 105 if (domain == NULL) { 106 if (_rpc_get_default_domain(&dfltdom) != 0) { 107 return (0); 108 } 109 domain = dfltdom; 110 } 111 if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 112 return (0); 113 } 114 sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain); 115 return (1); 116 } 117 118 119 /* 120 * Convert host to network-name 121 */ 122 int 123 host2netname(char *netname, char *host, char *domain) 124 { 125 char *dfltdom; 126 char hostname[MAXHOSTNAMELEN+1]; 127 128 if (domain == NULL) { 129 if (_rpc_get_default_domain(&dfltdom) != 0) { 130 return (0); 131 } 132 domain = dfltdom; 133 } 134 if (host == NULL) { 135 gethostname(hostname, sizeof(hostname)); 136 host = hostname; 137 } 138 if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) { 139 return (0); 140 } 141 sprintf(netname, "%s.%s@%s", OPSYS, host, domain); 142 return (1); 143 } 144