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/*
* Copyright 2006 Serge van den Boom <svdb@stack.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define RESOLVE_INTERNAL
#include "resolve.h"
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#define DEBUG_RESOLVE_REF
#ifdef DEBUG_RESOLVE_REF
# include "types.h"
# include "libs/log.h"
# include <string.h>
#endif
static ResolveState *
ResolveState_new(void) {
return (ResolveState *) malloc(sizeof (ResolveState));
}
static void
ResolveState_free(ResolveState *resolveState) {
free(resolveState);
}
static void
ResolveState_delete(ResolveState *resolveState) {
assert(resolveState->callbackID == CallbackID_invalid);
ResolveState_free(resolveState);
}
void
ResolveState_incRef(ResolveState *resolveState) {
assert(resolveState->refCount < REFCOUNT_MAX);
resolveState->refCount++;
#ifdef DEBUG_RESOLVE_REF
log_add(log_Debug, "ResolveState %08" PRIxPTR ": ref++ (%d)",
(uintptr_t) resolveState, resolveState->refCount);
#endif
}
bool
ResolveState_decRef(ResolveState *resolveState) {
assert(resolveState->refCount > 0);
resolveState->refCount--;
#ifdef DEBUG_RESOLVE_REF
log_add(log_Debug, "ResolveState %08" PRIxPTR ": ref-- (%d)",
(uintptr_t) resolveState, resolveState->refCount);
#endif
if (resolveState->refCount == 0) {
ResolveState_delete(resolveState);
return true;
}
return false;
}
void
ResolveState_setExtra(ResolveState *resolveState, void *extra) {
resolveState->extra = extra;
}
void *
ResolveState_getExtra(ResolveState *resolveState) {
return resolveState->extra;
}
static void
doResolveCallback(ResolveState *resolveState) {
ResolveState_incRef(resolveState);
(*resolveState->callback)(resolveState, resolveState->result);
{
bool released = ResolveState_decRef(resolveState);
assert(released);
(void) released; // In case assert() evaluates to nothing.
}
}
static void
doResolveErrorCallback(ResolveState *resolveState) {
ResolveState_incRef(resolveState);
resolveState->errorCallback(resolveState, &resolveState->error);
{
bool released = ResolveState_decRef(resolveState);
assert(released);
(void) released; // In case assert() evaluates to nothing.
}
}
static void
resolveCallback(ResolveState *resolveState) {
resolveState->callbackID = CallbackID_invalid;
if (resolveState->error.gaiRes == 0) {
// Successful lookup.
doResolveCallback(resolveState);
} else {
// Lookup failed.
doResolveErrorCallback(resolveState);
}
}
// Function that does getaddrinfo() and calls the callback function when
// the result is available.
// TODO: actually make this function asynchronous. Right now it just calls
// getaddrinfo() (which blocks) and then schedules the callback.
ResolveState *
getaddrinfoAsync(const char *node, const char *service,
const struct addrinfo *hints, ResolveFlags *flags,
ResolveCallback callback, ResolveErrorCallback errorCallback,
ResolveCallbackArg extra) {
ResolveState *resolveState;
resolveState = ResolveState_new();
resolveState->refCount = 1;
#ifdef DEBUG_RESOLVE_REF
log_add(log_Debug, "ResolveState %08" PRIxPTR ": ref=1 (%d)",
(uintptr_t) resolveState, resolveState->refCount);
#endif
resolveState->state = Resolve_resolving;
resolveState->flags = *flags;
resolveState->callback = callback;
resolveState->errorCallback = errorCallback;
resolveState->extra = extra;
resolveState->result = NULL;
resolveState->error.gaiRes =
getaddrinfo(node, service, hints, &resolveState->result);
resolveState->error.err = errno;
resolveState->callbackID = Callback_add(
(CallbackFunction) resolveCallback, (CallbackArg) resolveState);
return resolveState;
}
void
Resolve_close(ResolveState *resolveState) {
if (resolveState->callbackID != CallbackID_invalid) {
Callback_remove(resolveState->callbackID);
resolveState->callbackID = CallbackID_invalid;
}
resolveState->state = Resolve_closed;
ResolveState_decRef(resolveState);
}
// Split an addrinfo list into two separate lists, one with structures with
// the specified value for the ai_family field, the other with the other
// structures. The order of entries in the resulting lists will remain
// the same as in the original list.
// info - the original list
// family - the family for the first list
// selected - pointer to where the list of selected structures should be
// stored
// selectedEnd - pointer to where the end of 'selected' should be stored
// rest - pointer to where the list of not-selected structures should be
// stored
// restEnd - pointer to where the end of 'rest' should be stored
//
// Yes, it is allowed to modify the ai_next field of addrinfo structures.
// Or at least, it's not disallowed by RFC 3493, and the following
// text from that RFC seems to suggest it should be possible:
// ] The freeaddrinfo() function must support the freeing of arbitrary
// ] sublists of an addrinfo list originally returned by getaddrinfo().
void
splitAddrInfoOnFamily(struct addrinfo *info, int family,
struct addrinfo **selected, struct addrinfo ***selectedEnd,
struct addrinfo **rest, struct addrinfo ***restEnd) {
struct addrinfo *selectedFirst;
struct addrinfo **selectedNext;
struct addrinfo *restFirst;
struct addrinfo **restNext;
selectedNext = &selectedFirst;
restNext = &restFirst;
while (info != NULL) {
if (info->ai_family == family) {
*selectedNext = info;
selectedNext = &(*selectedNext)->ai_next;
} else {
*restNext = info;
restNext = &(*restNext)->ai_next;
}
info = info->ai_next;
}
*selectedNext = NULL;
*restNext = NULL;
// Fill in the result parameters.
*selected = selectedFirst;
*selectedEnd = selectedNext;
*rest = restFirst;
*restEnd = restNext;
}
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