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
)
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:
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.
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);