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HOSTS_ACCESS(3)						       HOSTS_ACCESS(3)

NAME
       hosts_access,  hosts_ctl,  request_init,	 request_set  - access control
       library

SYNOPSIS
       #include "tcpd.h"

       extern int allow_severity;
       extern int deny_severity;

       struct request_info *request_init(request, key, value, ..., 0)
       struct request_info *request;

       struct request_info *request_set(request, key, value, ..., 0)
       struct request_info *request;

       int hosts_access(request)
       struct request_info *request;

       int hosts_ctl(daemon, client_name, client_addr, client_user)
       char *daemon;
       char *client_name;
       char *client_addr;
       char *client_user;

DESCRIPTION
       The routines described in this  document	 are  part  of	the  libwrap.a
       library.	 They  implement  a  rule-based	 access	 control language with
       optional shell commands that are executed when a rule fires.

       request_init() initializes a structure with information about a	client
       request.	 request_set()	updates	 an already initialized request struc‐
       ture. Both functions take a variable-length list of key-value pairs and
       return  their first argument.  The argument lists are terminated with a
       zero key value. All string-valued arguments are	copied.	 The  expected
       keys (and corresponding value types) are:

       RQ_FILE (int)
	      The file descriptor associated with the request.

       RQ_CLIENT_NAME (char *)
	      The client host name.

       RQ_CLIENT_ADDR (char *)
	      A printable representation of the client network address.

       RQ_CLIENT_SIN (struct sockaddr_in *)
	      An  internal  representation  of	the client network address and
	      port.  The contents of the structure are not copied.

       RQ_SERVER_NAME (char *)
	      The hostname associated with the server endpoint address.

       RQ_SERVER_ADDR (char *)
	      A printable representation of the server endpoint address.

       RQ_SERVER_SIN (struct sockaddr_in *)
	      An internal representation of the server	endpoint  address  and
	      port.  The contents of the structure are not copied.

       RQ_DAEMON (char *)
	      The name of the daemon process running on the server host.

       RQ_USER (char *)
	      The  name	 of the user on whose behalf the client host makes the
	      request.

       hosts_access() consults the access  control  tables  described  in  the
       hosts_access(5)	manual	page.	When  internal endpoint information is
       available, host names and client user names are looked  up  on  demand,
       using the request structure as a cache.	hosts_access() returns zero if
       access should be denied.

       hosts_ctl() is a wrapper around the request_init()  and	hosts_access()
       routines	 with  a perhaps more convenient interface (though it does not
       pass  on	 enough	 information  to  support  automated  client  username
       lookups).  The client host address, client host name and username argu‐
       ments should contain valid data or STRING_UNKNOWN.  hosts_ctl() returns
       zero if access should be denied.

       The  allow_severity  and deny_severity variables determine how accepted
       and rejected requests may be logged. They must be provided by the call‐
       er and may be modified by rules in the access control tables.

DIAGNOSTICS
       Problems are reported via the syslog daemon.

SEE ALSO
       hosts_access(5),	   format    of	   the	  access    control    tables.
       hosts_options(5), optional extensions to the base language.

FILES
       /etc/hosts.allow, /etc/hosts.deny, access control tables.

BUGS
       hosts_access() uses the strtok() library function. This	may  interfere
       with other code that relies on strtok().

AUTHOR
       Wietse Venema (wietse@wzv.win.tue.nl)
       Department of Mathematics and Computing Science
       Eindhoven University of Technology
       Den Dolech 2, P.O. Box 513,
       5600 MB Eindhoven, The Netherlands

							       HOSTS_ACCESS(3)
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