/*
 * lib/krb5/rcache/rc_base.c
 *
 * This file of the Kerberos V5 software is derived from public-domain code
 * contributed by Daniel J. Bernstein, <brnstnd@acf10.nyu.edu>.
 *
 */


/*
 * Base "glue" functions for the replay cache.
 */

#include "rc_base.h"
#include "rc-int.h"
#include "k5-thread.h"

#define FREE(x) ((void) free((char *) (x)))

struct krb5_rc_typelist {
    const krb5_rc_ops *ops;
    struct krb5_rc_typelist *next;
};
static struct krb5_rc_typelist none = { &krb5_rc_none_ops, 0 };
static struct krb5_rc_typelist krb5_rc_typelist_dfl = { &krb5_rc_dfl_ops, &none };
static struct krb5_rc_typelist *typehead = &krb5_rc_typelist_dfl;
static k5_mutex_t rc_typelist_lock = K5_MUTEX_PARTIAL_INITIALIZER;

int krb5int_rc_finish_init(void)
{
    return k5_mutex_finish_init(&rc_typelist_lock);
}
void krb5int_rc_terminate(void)
{
    struct krb5_rc_typelist *t, *t_next;
    k5_mutex_destroy(&rc_typelist_lock);
    for (t = typehead; t != &krb5_rc_typelist_dfl; t = t_next) {
	t_next = t->next;
	free(t);
    }
}

krb5_error_code krb5_rc_register_type(krb5_context context,
				      const krb5_rc_ops *ops)
{
    struct krb5_rc_typelist *t;
    krb5_error_code err;
    err = k5_mutex_lock(&rc_typelist_lock);
    if (err)
	return err;
    for (t = typehead;t && strcmp(t->ops->type,ops->type);t = t->next)
	;
    if (t) {
	k5_mutex_unlock(&rc_typelist_lock);
	return KRB5_RC_TYPE_EXISTS;
    }
    t = (struct krb5_rc_typelist *) malloc(sizeof(struct krb5_rc_typelist));
    if (t == NULL) {
	k5_mutex_unlock(&rc_typelist_lock);
	return KRB5_RC_MALLOC;
    }
    t->next = typehead;
    t->ops = ops;
    typehead = t;
    k5_mutex_unlock(&rc_typelist_lock);
    return 0;
}

krb5_error_code krb5_rc_resolve_type(krb5_context context, krb5_rcache *id,
				     char *type)
{
    struct krb5_rc_typelist *t;
    krb5_error_code err;
    err = k5_mutex_lock(&rc_typelist_lock);
    if (err)
	return err;
    for (t = typehead;t && strcmp(t->ops->type,type);t = t->next)
	;
    if (!t) {
	k5_mutex_unlock(&rc_typelist_lock);
	return KRB5_RC_TYPE_NOTFOUND;
    }
    /* allocate *id? nah */
    (*id)->ops = t->ops;
    k5_mutex_unlock(&rc_typelist_lock);
    return k5_mutex_init(&(*id)->lock);
}

char * krb5_rc_get_type(krb5_context context, krb5_rcache id)
{
    return id->ops->type;
}

char * krb5_rc_default_type(krb5_context context)
{
    char *s;
    if ((s = getenv("KRB5RCACHETYPE")))
	return s;
    else
	return "dfl";
}

char * krb5_rc_default_name(krb5_context context)
{
    char *s;
    if ((s = getenv("KRB5RCACHENAME")))
	return s;
    else
	return (char *) 0;
}

krb5_error_code
krb5_rc_default(krb5_context context, krb5_rcache *id)
{
    krb5_error_code retval;

    if (!(*id = (krb5_rcache )malloc(sizeof(**id))))
	return KRB5_RC_MALLOC;

    if ((retval = krb5_rc_resolve_type(context, id, 
				       krb5_rc_default_type(context)))) {
	k5_mutex_destroy(&(*id)->lock);
	FREE(*id);
	return retval;
    }
    if ((retval = krb5_rc_resolve(context, *id, 
				  krb5_rc_default_name(context)))) {
	k5_mutex_destroy(&(*id)->lock);
	FREE(*id);
	return retval;
    }
    (*id)->magic = KV5M_RCACHE;
    return retval;
}


krb5_error_code krb5_rc_resolve_full(krb5_context context, krb5_rcache *id, char *string_name)
{
    char *type;
    char *residual;
    krb5_error_code retval;
    unsigned int diff;

    if (!(residual = strchr(string_name,':')))
	return KRB5_RC_PARSE;
 
    diff = residual - string_name;
    if (!(type = malloc(diff + 1)))
	return KRB5_RC_MALLOC;
    (void) strncpy(type, string_name, diff);
    type[residual - string_name] = '\0';

    if (!(*id = (krb5_rcache) malloc(sizeof(**id)))) {
	FREE(type);
	return KRB5_RC_MALLOC;
    }

    if ((retval = krb5_rc_resolve_type(context, id,type))) {
	FREE(type);
	k5_mutex_destroy(&(*id)->lock);
	FREE(*id);
	return retval;
    }
    FREE(type);
    if ((retval = krb5_rc_resolve(context, *id,residual + 1))) {
	k5_mutex_destroy(&(*id)->lock);
	FREE(*id);
	return retval;
    }
    (*id)->magic = KV5M_RCACHE;
    return retval;
}

