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    The following form allows you to view linux man pages.

    Command:

    hosts_access

    
    
    
    

    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;
    
           void fromhost(request)
           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.
    
           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.    fromhost()   must   be   called   before
           hosts_access().
    
           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
           caller 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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