ypbind.tproj/ypbind.8

   1 .\"     $OpenBSD: ypbind.8,v 1.8 1997/06/18 23:50:12 deraadt Exp $
   2 .\"     $NetBSD: ypbind.8,v 1.2 1996/02/28 01:21:00 thorpej Exp $
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   4 .\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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   7 .\" This code is derived from software contributed to The NetBSD Foundation
   8 .\" by Jason R. Thorpe.
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  38 .Dd October 25, 1994
  39 .Dt YPBIND 8
  40 .Os
  41 .Sh NAME
  42 .Nm ypbind
  43 .Nd create and maintain a binding to a YP server
  44 .Sh SYNOPSIS
  45 .Nm
  46 .Op Fl ypset
  47 .Op Fl ypsetme
  48 .Op Fl insecure
  49 .Sh DESCRIPTION
  50 .Nm
  51 finds the server for a particular YP domain and stores information about it
  52 in a
  53 .Pa binding file.
  54 This binding information includes the IP address of the server associated with
  55 that particular domain and which port the server is using.  This information
  56 is stored in the directory
  57 .Pa /var/yp/binding
  58 in a file named with the convention
  59 .Pa DOMAINNAME.version.
  60 (The YP system only supplies information on version 2.)
  61 .Pp
  62 When
  63 .Nm
  64 starts the primary domain (or gets the first request for a new domain),
  65 it checks if a file for the domain in question exists in the directory
  66 .Pa /etc/yp/
  67 (ie. /etc/yp/DOMAINNAME).
  68 If such a file exists, it will list the hosts which
  69 .Nm
  70 should restrict it's server search to.
  71 Otherwise,
  72 .Nm
  73 assumes it will need to use broadcasts to find a valid server.
  74 Using either of these techniques,
  75 .Nm
  76 will search for a server willing to serve maps for the
  77 client's domain.  Once a binding is established,
  78 .Nm
  79 maintains this binding by periodically communicating with the server to which
  80 it is bound.  If the binding is somehow lost, e.g by server reboot,
  81 .Nm
  82 marks the domain as unbound and attempts to re-establish the binding.
  83 When the binding is once again successful,
  84 .Nm
  85 marks the domain as bound and resumes its periodic check.
  86 .Pp
  87 The options are as follows:
  88 .Bl -tag -width indentxx
  89 .It Fl ypset
  90 .Xr ypset 8
  91 may be used to change the server to which a domain is bound.
  92 .It Fl ypsetme
  93 .Xr ypset 8
  94 may be used only from this machine to change the server
  95 to which a domain is bound.
  96 .It Fl insecure
  97 permit binding to a
  98 .Xr ypserv 8
  99 on a non-reserved port.  This is needed if receiving maps from
 100 SunOS 3.x or Ultrix.
 101 .El
 102 .Pp
 103 The
 104 .Fl ypset
 105 and
 106 .Fl ypsetme
 107 options are dangerous and should be avoided.
 108 For greatest security, the use of a server list in
 109 .Pa /etc/yp/DOMAINNAME
 110 is recommended.
 111 The file should contain a list of valid YP server hostnames,
 112 with one hostname per line.
 113 The comment character is #.
 114 .Pp
 115 If the directory
 116 .Pa /var/yp/binding
 117 exists, YP is started automatically at boot time by
 118 .Pa /etc/rc .
 119 .Sh FILES
 120 .Pa /var/yp/binding/DOMAINNAME.version
 121 - binding file for domainname
 122 .Pa /etc/yp/DOMAINNNAME
 123 - server list for this particular domain
 124 .Sh SEE ALSO
 125 .Xr domainname 1 ,
 126 .Xr ypcat 1 ,
 127 .Xr ypmatch 1 ,
 128 .Xr yppoll 8 ,
 129 .Xr ypset 8 ,
 130 .Xr ypwhich 1 ,
 131 .Xr ypserv 8 ,
 132 .Xr yp 8
 133 .Sh AUTHOR
 134 Theo de Raadt