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krb5_krbhst_next(3) [freebsd man page]

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 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_init_flags(krb5_context context, const char *realm, unsigned int type, int flags, 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() (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 con- taining 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 ``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 ", host); krb5_krbhst_free(context, handle); SEE ALSO
getaddrinfo(3), krb5_get_krbhst(3), krb5_send_to_kdc_flags(3) HISTORY
These functions first appeared in Heimdal 0.3g. HEIMDAL
May 10, 2005 HEIMDAL
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