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 1.8 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, (char *) NULL, (char *) NULL));
  93         } else {
  94                 return (user2netname(name, uid, (char *) 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 }