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/** @example tkt_creds.c
*
* Usage example for krb5_tkt_creds function family
*/
#include "krb5.h"
krb5_error_code
func(krb5_context context, krb5_flags options,
krb5_ccache ccache, krb5_creds *in_creds,
krb5_creds **out_creds)
{
krb5_error_code code = KRB5_OK;
krb5_creds *ncreds = NULL;
krb5_tkt_creds_context ctx = NULL;
*out_creds = NULL;
/* Allocate a container. */
ncreds = k5alloc(sizeof(*ncreds), &code);
if (ncreds == NULL)
goto cleanup;
/* Make and execute a krb5_tkt_creds context to get the credential. */
code = krb5_tkt_creds_init(context, ccache, in_creds, options, &ctx);
if (code != KRB5_OK)
goto cleanup;
code = krb5_tkt_creds_get(context, ctx);
if (code != KRB5_OK)
goto cleanup;
code = krb5_tkt_creds_get_creds(context, ctx, ncreds);
if (code != KRB5_OK)
goto cleanup;
*out_creds = ncreds;
ncreds = NULL;
cleanup:
krb5_free_creds(context, ncreds);
krb5_tkt_creds_free(context, ctx);
return code;
}
/* Allocate zeroed memory; set *code to 0 on success or ENOMEM on failure. */
static inline void *
k5alloc(size_t len, krb5_error_code *code)
{
void *ptr;
/* Allocate at least one byte since zero-byte allocs may return NULL. */
ptr = calloc((len > 0) ? len : 1, 1);
*code = (ptr == NULL) ? ENOMEM : 0;
return ptr;
}
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