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ypserv(8) [osx man page]

YPSERV(8)						    BSD System Manager's Manual 						 YPSERV(8)

ypserv -- YP server daemon SYNOPSIS
ypserv [-1] [-a aclfile] [-d] [-x] DESCRIPTION
Ypserv is a fundamental part of the network information system called YP. This server provides information from YP maps to the YP clients on the network. A YP map is stored on the server as a db(3) database. A number of YP maps is grouped together in a domain. Ypserv determines the domains it serves by looking for a directory with the domain name in /var/yp. YP hasn't been known for high security through the years. In recent years security has improved by restricting access to the server. In SunOS 4.1 has a new file occured named /var/yp/securenet. It contains networks the server can assume is secure. For information about file format see securenet(5). Before the author of this server had seen securenet(5) another format was implemented ypserv.acl(5). This file format makes it possible to allow and deny hosts and networks access to the server. This file can have any name since it's given by the argument to -a (use full path). The file used can be reread by sending a SIGHUP to ypserv. The process pid can be found in the file /var/run/ If a host isn't secure all queries to the server will result in a YP_NODOM result. If the file /var/yp/ypserv.log exists then messages will be written to the file. If a directory named the same as the system domainname exists in /var/yp/ (ie. the domainname is foo and directory /var/yp/foo exists), then ypserv will be automatically started at boot time. The options are as follows: -1 Allow ypserv to answer old YP version 1 requests. -a aclfile Don't use /var/yp/securenet. Use another file with another file format. For futher information see man page for ypserv.acl. -d Use Internet Domain Name System. If a query to map hosts.byname or hosts.byaddr fails, make a DNS query and return the result if suc- cessful. Alternately, if these maps were built on the YP master using makedbm -b then DNS queries will be done without needing to specify -d. -x Terminate the server after processing aclfile or /var/yp/securenet. FILES
/var/yp/ypserv.log /var/yp/securenet /var/run/ SEE ALSO
yp(8), ypserv.acl(5), securenet(5), ypbind(1) AUTHOR
Mats O Jansson <> BSD
June 27, 1994 BSD

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YPBIND(8)						    BSD System Manager's Manual 						 YPBIND(8)

ypbind -- create and maintain a binding to a YP server SYNOPSIS
ypbind [-ypset] [-ypsetme] [-insecure] DESCRIPTION
ypbind finds the server for a particular YP domain and stores information about it in a binding file. This binding information includes the IP address of the server associated with that particular domain and which port the server is using. This information is stored in the direc- tory /var/yp/binding in a file named with the convention DOMAINNAME.version. (The YP system only supplies information on version 2.) When ypbind starts the primary domain (or gets the first request for a new domain), it checks if a file for the domain in question exists in the directory /var/yp/binding (ie. /var/yp/binding/DOMAINNAME.ypservers). If such a file exists, it will list the hosts which ypbind should restrict its server search to. Otherwise, ypbind assumes it will need to use broadcasts to find a valid server. Using either of these tech- niques, ypbind will search for a server willing to serve maps for the client's domain. Once a binding is established, ypbind maintains this binding by periodically communicating with the server to which it is bound. If the binding is somehow lost, e.g by server reboot, ypbind marks the domain as unbound and attempts to re-establish the binding. When the binding is once again successful, ypbind marks the domain as bound and resumes its periodic check. The options are as follows: -ypset ypset(8) may be used to change the server to which a domain is bound. -ypsetme ypset(8) may be used only from this machine to change the server to which a domain is bound. -insecure permit binding to a ypserv(8) on a non-reserved port. This is needed if receiving maps from SunOS 3.x or Ultrix. -d enable debugging output. The -ypset and -ypsetme options are dangerous and should be avoided. For greatest security, the use of a server list in /var/yp/binding/DOMAINNAME.ypservers is recommended. The file should contain a list of valid YP server hostnames, with one hostname per line. The comment character is #. FILES
/var/yp/binding/DOMAINNAME.version - binding file for domainname /var/yp/binding/DOMAINNAME.ypservers - server list for this particular domain SEE ALSO
domainname(1), ypcat(1), ypmatch(1), yppoll(8), ypset(8), ypwhich(1), ypserv(8), yp(8) AUTHOR
Theo de Raadt BSD
October 25, 1994 BSD
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