#ifndef DNS_LOOKUP_H
#define DNS_LOOKUP_H
#define DNS_CLIENT_SOCKET_NAME "dns-client"
struct dns_lookup;
struct dns_lookup_settings {
const char *dns_client_socket_path;
unsigned int timeout_msecs;
/* the idle_timeout_msecs works only with the dns_client_* API.
0 = disconnect immediately */
unsigned int idle_timeout_msecs;
/* ioloop to run the lookup on (defaults to current_ioloop) */
struct ioloop *ioloop;
};
struct dns_lookup_result {
/* all is ok if ret=0, otherwise it contains net_gethosterror()
compatible error code. error string is always set if ret != 0. */
int ret;
const char *error;
/* how many milliseconds the lookup took. */
unsigned int msecs;
/* for IP lookup: */
unsigned int ips_count;
const struct ip_addr *ips;
/* for PTR lookup: */
const char *name;
};
typedef void dns_lookup_callback_t(const struct dns_lookup_result *result,
void *context);
/* Do asynchronous DNS lookup via dns-client UNIX socket. Returns 0 if lookup
started, -1 if there was an error communicating with the UNIX socket.
When failing with -1, the callback is called before returning from the
function. */
int dns_lookup(const char *host, const struct dns_lookup_settings *set,
dns_lookup_callback_t *callback, void *context,
struct dns_lookup **lookup_r) ATTR_NULL(4);
#define dns_lookup(host, set, callback, context, lookup_r) \
dns_lookup(host + \
CALLBACK_TYPECHECK(callback, void (*)( \
const struct dns_lookup_result *, typeof(context))), \
set, (dns_lookup_callback_t *)callback, context, lookup_r)
int dns_lookup_ptr(const struct ip_addr *ip,
const struct dns_lookup_settings *set,
dns_lookup_callback_t *callback, void *context,
struct dns_lookup **lookup_r) ATTR_NULL(4);
#define dns_lookup_ptr(host, set, callback, context, lookup_r) \
dns_lookup_ptr(host + \
CALLBACK_TYPECHECK(callback, void (*)( \
const struct dns_lookup_result *, typeof(context))), \
set, (dns_lookup_callback_t *)callback, context, lookup_r)
/* Abort the DNS lookup without calling the callback. */
void dns_lookup_abort(struct dns_lookup **lookup);
void dns_lookup_switch_ioloop(struct dns_lookup *lookup);
/* Alternative API for clients that need to do multiple DNS lookups. */
struct dns_client *dns_client_init(const struct dns_lookup_settings *set);
void dns_client_deinit(struct dns_client **client);
/* Connect immediately to the dns-lookup socket. */
int dns_client_connect(struct dns_client *client, const char **error_r);
int dns_client_lookup(struct dns_client *client, const char *host,
dns_lookup_callback_t *callback, void *context,
struct dns_lookup **lookup_r) ATTR_NULL(4);
#define dns_client_lookup(client, host, callback, context, lookup_r) \
dns_client_lookup(client, host + \
CALLBACK_TYPECHECK(callback, void (*)( \
const struct dns_lookup_result *, typeof(context))), \
(dns_lookup_callback_t *)callback, context, lookup_r)
int dns_client_lookup_ptr(struct dns_client *client, const struct ip_addr *ip,
dns_lookup_callback_t *callback, void *context,
struct dns_lookup **lookup_r) ATTR_NULL(4);
#define dns_client_lookup_ptr(client, host, callback, context, lookup_r) \
dns_client_lookup_ptr(client, host + \
CALLBACK_TYPECHECK(callback, void (*)( \
const struct dns_lookup_result *, typeof(context))), \
(dns_lookup_callback_t *)callback, context, lookup_r)
void dns_client_switch_ioloop(struct dns_client *client);
#endif