lib/libc/rpc/netname.c

   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 }