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KRB5_KRBHST_INIT(3)		   BSD Library Functions Manual 	      KRB5_KRBHST_INIT(3)

     krb5_krbhst_init, krb5_krbhst_init_flags, 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

     Kerberos 5 Library (libkrb5, -lkrb5)

     #include <krb5/krb5.h>

     krb5_krbhst_init(krb5_context context, const char *realm, unsigned int type,
	 krb5_krbhst_handle *handle);

     krb5_krbhst_init_flags(krb5_context context, const char *realm, unsigned int type,
	 int flags, krb5_krbhst_handle *handle);

     krb5_krbhst_next(krb5_context context, krb5_krbhst_handle handle, krb5_krbhst_info **host);

     krb5_krbhst_next_as_string(krb5_context context, krb5_krbhst_handle handle, char *hostname,
	 size_t hostlen);

     krb5_krbhst_reset(krb5_context context, krb5_krbhst_handle handle);

     krb5_krbhst_free(krb5_context context, krb5_krbhst_handle handle);

     krb5_krbhst_format_string(krb5_context context, const krb5_krbhst_info *host,
	 char *hostname, size_t hostlen);

     krb5_krbhst_get_addrinfo(krb5_context context, krb5_krbhst_info *host,
	 struct addrinfo **ai);

     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() (or
     krb5_krbhst_init_flags()) with the realm of interest and the type of service to lookup. The
     type can be one of:


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

     The flag argument to krb5_krbhst_init_flags is the same flags as krb5_send_to_kdc_flags()
     uses.  Possible values are:

	   KRB5_KRBHST_FLAGS_MASTER	only talk to master (readwrite) KDC
	   KRB5_KRBHST_FLAGS_LARGE_MSG	this is a large message, so use transport that can handle

     For each call to krb5_krbhst_next() information on a new host is returned. The former func-
     tion returns in 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_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.

     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);

     getaddrinfo(3), krb5_get_krbhst(3), krb5_send_to_kdc_flags(3)

     These functions first appeared in Heimdal 0.3g.

BSD					   May 10, 2005 				      BSD
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