man krb5_krbhst_next (Fonctions bibliothèques) - krb5_krbhst_init ,

NAME

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

LIBRARY

Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

krb5_krbhst_init krb5_context context const char *realm unsigned int type krb5_krbhst_handle *handlekrb5_krbhst_init_flags krb5_context context const char *realm unsigned int type int flags krb5_krbhst_handle *handlekrb5_krbhst_next krb5_context context krb5_krbhst_handle handle krb5_krbhst_info **hostkrb5_krbhst_next_as_string krb5_context context krb5_krbhst_handle handle char *hostname size_t hostlenkrb5_krbhst_reset krb5_context context krb5_krbhst_handle handlekrb5_krbhst_free krb5_context context krb5_krbhst_handle handlekrb5_krbhst_format_string krb5_context context const krb5_krbhst_info *host char *hostname size_t hostlenkrb5_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 (or krb5_krbhst_init_flags ) with the realm of interest and the type of service to lookup. The type can be one of:

KRB5_KRBHST_KDC
KRB5_KRBHST_ADMIN
KRB5_KRBHST_CHANGEPW
KRB5_KRBHST_KRB524

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 that.

For each call to krb5_krbhst_next information on a new host is returned. The former function 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_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.

EXAMPLES

The following code will print the KDCs of the 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);

SEE ALSO

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

HISTORY

These functions first appeared in Heimdal 0.3g.