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KRB5_KRBHST_INIT (3) | C library functions | Unix Manual Pages | :man

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

CONTENTS

Library
Synopsis
Description
Example
History
See Also

LIBRARY

Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS


.In 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 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.

For each call to krb5_krbhst_next information 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.

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);

HISTORY

These functions first appeared in Heimdal 0.3g.

SEE ALSO

getaddrinfo(3), krb5_get_krbhst(3)


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