KRB5_KRBHST_INIT(3) | Library Functions Manual | KRB5_KRBHST_INIT(3) |
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 hostsLIBRARY¶
Kerberos 5 Library (libkrb5, -lkrb5)SYNOPSIS¶
#include <krb5.h> krb5_error_codekrb5_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
- 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.
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;
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\n", 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.May 10, 2005 | HEIMDAL |