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krb5_krbhst_init (3)

>> krb5_krbhst_init (3) ( FreeBSD man: Библиотечные вызовы )

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HEIMDAL

NAME

krb5_krbhst_init

 
krb5_krbhst_next

 
krb5_krbhst_next_as_string

 
krb5_krbhst_reset

 
krb5_krbhst_free

 
krb5_krbhst_format_string

 
krb5_krbhst_get_addrinfo

 - lookup Kerberos KDC hosts

LIBRARY

Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

#include <krb5.h>
krb5_error_code krb5_krbhst_init (krb5_context context const char *realm unsigned int type krb5_krbhst_handle *handle);
krb5_error_code krb5_krbhst_next (krb5_context context krb5_krbhst_handle handle krb5_krbhst_info **host);
krb5_error_code krb5_krbhst_next_as_string (krb5_context context krb5_krbhst_handle handle char *hostname size_t hostlen);
void krb5_krbhst_reset (krb5_context context krb5_krbhst_handle handle);
void krb5_krbhst_free (krb5_context context krb5_krbhst_handle handle);
krb5_error_code krb5_krbhst_format_string (krb5_context context const krb5_krbhst_info *host char *hostname size_t hostlen);
krb5_error_code krb5_krbhst_get_addrinfo (krb5_context context krb5_krbhst_info *host struct addrinfo **ai);

DESCRIPTION

These functions are used to sequence through all Kerberos hosts of a particular realm and service. The service type can be the KDCs, the administrative servers, the password changing servers, or the servers for Kerberos 4 ticket conversion.

First a handle to a particular service is obtained by calling krb5_krbhst_init ();
with the Fa realm of interest and the type of service to lookup. The Fa type can be one of:

KRB5_KRBHST_KDC
KRB5_KRBHST_ADMIN
KRB5_KRBHST_CHANGEPW
KRB5_KRBHST_KRB524

The Fa handle is returned to the caller, and should be passed to the other functions.

For each call to krb5_krbhst_next ();
information a new host is returned. The former function returns in Fa host a pointer to a structure containing information about the host, such as protocol, hostname, and port:

typedef struct krb5_krbhst_info {
    enum { KRB5_KRBHST_UDP,
           KRB5_KRBHST_TCP,
           KRB5_KRBHST_HTTP } proto;
    unsigned short port;
    struct addrinfo *ai;
    struct krb5_krbhst_info *next;
    char hostname[1];
} krb5_krbhst_info;

The related function, krb5_krbhst_next_as_string (,);
return the same information as a url-like string.

When there are no more hosts, these functions return KRB5_KDC_UNREACH

To re-iterate over all hosts, call krb5_krbhst_reset ();
and the next call to krb5_krbhst_next ();
will return the first host.

When done with the handle, krb5_krbhst_free ();
should be called.

To use a krb5_krbhst_info there are two functions: krb5_krbhst_format_string ();
that will return a printable representation of that struct and krb5_krbhst_get_addrinfo ();
that will return a struct addrinfo that can then be used for communicating with the server mentioned.

EXAMPLE

The following code will print the KDCs of the realm ``MY.REALM''

krb5_krbhst_handle handle;
char host[MAXHOSTNAMELEN];
krb5_krbhst_init(context, "MY.REALM", KRB5_KRBHST_KDC, &handle);
while(krb5_krbhst_next_as_string(context, handle,
                                 host, sizeof(host)) == 0)
    printf("%s\n", host);
krb5_krbhst_free(context, handle);