C++ ISC_LINK_INIT函数代码示例

void
setup_entropy(isc_mem_t *mctx, const char *randomfile, isc_entropy_t **ectx) {
	isc_result_t result;
	isc_entropysource_t *source = NULL;
	entropysource_t *elt;
	int usekeyboard = ISC_ENTROPY_KEYBOARDMAYBE;

	REQUIRE(ectx != NULL);

	if (*ectx == NULL) {
		result = isc_entropy_create(mctx, ectx);
		if (result != ISC_R_SUCCESS)
			fatal("could not create entropy object");
		ISC_LIST_INIT(sources);
	}

	if (randomfile != NULL && strcmp(randomfile, "keyboard") == 0) {
		usekeyboard = ISC_ENTROPY_KEYBOARDYES;
		randomfile = NULL;
	}

	result = isc_entropy_usebestsource(*ectx, &source, randomfile,
					   usekeyboard);

	if (result != ISC_R_SUCCESS)
		fatal("could not initialize entropy source: %s",
		      isc_result_totext(result));

	if (source != NULL) {
		elt = isc_mem_get(mctx, sizeof(*elt));
		if (elt == NULL)
			fatal("out of memory");
		elt->source = source;
		elt->mctx = mctx;
		ISC_LINK_INIT(elt, link);
		ISC_LIST_APPEND(sources, elt, link);
	}
}

static inline isc_result_t
tostruct_in_nsap_ptr(ARGS_TOSTRUCT) {
	isc_region_t region;
	dns_rdata_in_nsap_ptr_t *nsap_ptr = target;
	dns_name_t name;

	REQUIRE(rdata->type == dns_rdatatype_nsap_ptr);
	REQUIRE(rdata->rdclass == dns_rdataclass_in);
	REQUIRE(target != NULL);
	REQUIRE(rdata->length != 0);

	nsap_ptr->common.rdclass = rdata->rdclass;
	nsap_ptr->common.rdtype = rdata->type;
	ISC_LINK_INIT(&nsap_ptr->common, link);

	dns_name_init(&name, NULL);
	dns_rdata_toregion(rdata, &region);
	dns_name_fromregion(&name, &region);
	dns_name_init(&nsap_ptr->owner, NULL);
	RETERR(name_duporclone(&name, mctx, &nsap_ptr->owner));
	nsap_ptr->mctx = mctx;
	return (ISC_R_SUCCESS);
}

static inline isc_result_t
tostruct_x25(ARGS_TOSTRUCT) {
    dns_rdata_x25_t *x25 = target;
    isc_region_t r;

    REQUIRE(rdata->type == dns_rdatatype_x25);
    REQUIRE(target != NULL);
    REQUIRE(rdata->length != 0);

    x25->common.rdclass = rdata->rdclass;
    x25->common.rdtype = rdata->type;
    ISC_LINK_INIT(&x25->common, link);

    dns_rdata_toregion(rdata, &r);
    x25->x25_len = uint8_fromregion(&r);
    isc_region_consume(&r, 1);
    x25->x25 = mem_maybedup(mctx, r.base, x25->x25_len);
    if (x25->x25 == NULL)
        return (ISC_R_NOMEMORY);

    x25->mctx = mctx;
    return (ISC_R_SUCCESS);
}

static inline isc_result_t tostruct_in_aaaa (ARGS_TOSTRUCT)
{
    dns_rdata_in_aaaa_t *aaaa = target;

    isc_region_t r;

    REQUIRE (rdata->type == 28);
    REQUIRE (rdata->rdclass == 1);
    REQUIRE (target != NULL);
    REQUIRE (rdata->length == 16);

    UNUSED (mctx);

    aaaa->common.rdclass = rdata->rdclass;
    aaaa->common.rdtype = rdata->type;
    ISC_LINK_INIT (&aaaa->common, link);

    dns_rdata_toregion (rdata, &r);
    INSIST (r.length == 16);
    memcpy (aaaa->in6_addr.s6_addr, r.base, 16);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
tostruct_in_dhcid(ARGS_TOSTRUCT) {
	dns_rdata_in_dhcid_t *dhcid = target;
	isc_region_t region;

	REQUIRE(rdata->type == 49);
	REQUIRE(rdata->rdclass == 1);
	REQUIRE(target != NULL);
	REQUIRE(rdata->length != 0);

	dhcid->common.rdclass = rdata->rdclass;
	dhcid->common.rdtype = rdata->type;
	ISC_LINK_INIT(&dhcid->common, link);

	dns_rdata_toregion(rdata, &region);

	dhcid->dhcid = mem_maybedup(mctx, region.base, region.length);
	if (dhcid->dhcid == NULL)
		return (ISC_R_NOMEMORY);

	dhcid->mctx = mctx;
	return (ISC_R_SUCCESS);
}

static inline isc_result_t
tostruct_in_nsap(ARGS_TOSTRUCT) {
	dns_rdata_in_nsap_t *nsap = target;
	isc_region_t r;

	REQUIRE(rdata->type == 22);
	REQUIRE(rdata->rdclass == 1);
	REQUIRE(target != NULL);
	REQUIRE(rdata->length != 0);

	nsap->common.rdclass = rdata->rdclass;
	nsap->common.rdtype = rdata->type;
	ISC_LINK_INIT(&nsap->common, link);

	dns_rdata_toregion(rdata, &r);
	nsap->nsap_len = r.length;
	nsap->nsap = mem_maybedup(mctx, r.base, r.length);
	if (nsap->nsap == NULL)
		return (ISC_R_NOMEMORY);

	nsap->mctx = mctx;
	return (ISC_R_SUCCESS);
}

static isc_result_t
controlkeylist_fromcfg(const cfg_obj_t *keylist, isc_mem_t *mctx,
		       controlkeylist_t *keyids)
{
	const cfg_listelt_t *element;
	char *newstr = NULL;
	const char *str;
	const cfg_obj_t *obj;
	controlkey_t *key;

	for (element = cfg_list_first(keylist);
	     element != NULL;
	     element = cfg_list_next(element))
	{
		obj = cfg_listelt_value(element);
		str = cfg_obj_asstring(obj);
		newstr = isc_mem_strdup(mctx, str);
		if (newstr == NULL)
			goto cleanup;
		key = isc_mem_get(mctx, sizeof(*key));
		if (key == NULL)
			goto cleanup;
		key->keyname = newstr;
		key->secret.base = NULL;
		key->secret.length = 0;
		ISC_LINK_INIT(key, link);
		ISC_LIST_APPEND(*keyids, key, link);
		newstr = NULL;
	}
	return (ISC_R_SUCCESS);

 cleanup:
	if (newstr != NULL)
		isc_mem_free(mctx, newstr);
	free_controlkeylist(keyids, mctx);
	return (ISC_R_NOMEMORY);
}

isc_result_t
dns_db_register(const char *name, dns_dbcreatefunc_t create, void *driverarg,
		isc_mem_t *mctx, dns_dbimplementation_t **dbimp)
{
	dns_dbimplementation_t *imp;

	REQUIRE(name != NULL);
	REQUIRE(dbimp != NULL && *dbimp == NULL);

	RUNTIME_CHECK(isc_once_do(&once, initialize) == ISC_R_SUCCESS);

	RWLOCK(&implock, isc_rwlocktype_write);
	imp = impfind(name);
	if (imp != NULL) {
		RWUNLOCK(&implock, isc_rwlocktype_write);
		return (ISC_R_EXISTS);
	}

	imp = isc_mem_get(mctx, sizeof(dns_dbimplementation_t));
	if (imp == NULL) {
		RWUNLOCK(&implock, isc_rwlocktype_write);
		return (ISC_R_NOMEMORY);
	}
	imp->name = name;
	imp->create = create;
	imp->mctx = NULL;
	imp->driverarg = driverarg;
	isc_mem_attach(mctx, &imp->mctx);
	ISC_LINK_INIT(imp, link);
	ISC_LIST_APPEND(implementations, imp, link);
	RWUNLOCK(&implock, isc_rwlocktype_write);

	*dbimp = imp;

	return (ISC_R_SUCCESS);
}

static inline isc_result_t tostruct_md (ARGS_TOSTRUCT)
{
    dns_rdata_md_t *md = target;

    isc_region_t r;

    dns_name_t name;

    REQUIRE (rdata->type == 3);
    REQUIRE (target != NULL);
    REQUIRE (rdata->length != 0);

    md->common.rdclass = rdata->rdclass;
    md->common.rdtype = rdata->type;
    ISC_LINK_INIT (&md->common, link);

    dns_name_init (&name, NULL);
    dns_rdata_toregion (rdata, &r);
    dns_name_fromregion (&name, &r);
    dns_name_init (&md->md, NULL);
    RETERR (name_duporclone (&name, mctx, &md->md));
    md->mctx = mctx;
    return (ISC_R_SUCCESS);
}

static inline isc_result_t
tostruct_isdn(ARGS_TOSTRUCT) {
	dns_rdata_isdn_t *isdn = target;
	isc_region_t r;

	REQUIRE(rdata->type == 20);
	REQUIRE(target != NULL);
	REQUIRE(rdata->length != 0);

	isdn->common.rdclass = rdata->rdclass;
	isdn->common.rdtype = rdata->type;
	ISC_LINK_INIT(&isdn->common, link);

	dns_rdata_toregion(rdata, &r);

	isdn->isdn_len = uint8_fromregion(&r);
	isc_region_consume(&r, 1);
	isdn->isdn = mem_maybedup(mctx, r.base, isdn->isdn_len);
	if (isdn->isdn == NULL)
		return (ISC_R_NOMEMORY);
	isc_region_consume(&r, isdn->isdn_len);

	isdn->subaddress_len = uint8_fromregion(&r);
	isc_region_consume(&r, 1);
	isdn->subaddress = mem_maybedup(mctx, r.base, isdn->subaddress_len);
	if (isdn->subaddress == NULL)
		goto cleanup;

	isdn->mctx = mctx;
	return (ISC_R_SUCCESS);

 cleanup:
	if (mctx != NULL && isdn->isdn != NULL)
		isc_mem_free(mctx, isdn->isdn);
	return (ISC_R_NOMEMORY);
}

static inline isc_result_t
tostruct_lp(ARGS_TOSTRUCT) {
	isc_region_t region;
	dns_rdata_lp_t *lp = target;
	dns_name_t name;

	REQUIRE(rdata->type == dns_rdatatype_lp);
	REQUIRE(target != NULL);
	REQUIRE(rdata->length != 0);

	lp->common.rdclass = rdata->rdclass;
	lp->common.rdtype = rdata->type;
	ISC_LINK_INIT(&lp->common, link);

	dns_name_init(&name, NULL);
	dns_rdata_toregion(rdata, &region);
	lp->pref = uint16_fromregion(&region);
	isc_region_consume(&region, 2);
	dns_name_fromregion(&name, &region);
	dns_name_init(&lp->lp, NULL);
	RETERR(name_duporclone(&name, mctx, &lp->lp));
	lp->mctx = mctx;
	return (ISC_R_SUCCESS);
}

static isc_result_t
listener_create(isc_mem_t *mctx, ns_lwresd_t *lwresd,
		ns_lwreslistener_t **listenerp)
{
	ns_lwreslistener_t *listener;
	isc_result_t result;

	REQUIRE(listenerp != NULL && *listenerp == NULL);

	listener = isc_mem_get(mctx, sizeof(ns_lwreslistener_t));
	if (listener == NULL)
		return (ISC_R_NOMEMORY);

	result = isc_mutex_init(&listener->lock);
	if (result != ISC_R_SUCCESS) {
		isc_mem_put(mctx, listener, sizeof(ns_lwreslistener_t));
		return (result);
	}

	listener->magic = LWRESLISTENER_MAGIC;
	listener->refs = 1;

	listener->sock = NULL;

	listener->manager = NULL;
	ns_lwdmanager_attach(lwresd, &listener->manager);

	listener->mctx = NULL;
	isc_mem_attach(mctx, &listener->mctx);

	ISC_LINK_INIT(listener, link);
	ISC_LIST_INIT(listener->cmgrs);

	*listenerp = listener;
	return (ISC_R_SUCCESS);
}

int
main(int argc, char *argv[]) {
	int i, ch, error;
	struct addrinfo hints, *res;
	isc_result_t result;
	isc_sockaddr_t sa;
	isc_sockaddrlist_t servers;
	isc_taskmgr_t *taskmgr = NULL;
	isc_socketmgr_t *socketmgr = NULL;
	isc_timermgr_t *timermgr = NULL;

	while ((ch = getopt(argc, argv, "c:dhv")) != -1) {
		switch (ch) {
		case 'c':
			cacheserver = optarg;
			break;
		case 'd':
			debug_mode = ISC_TRUE;
			break;
		case 'h':
			usage();
			break;
		case 'v':
			verbose_level++;
			break;
		default:
			usage();
			break;
		}
	}

	argc -= optind;
	argv += optind;

	/* Common set up */
	isc_lib_register();
	result = dns_lib_init();
	if (result != ISC_R_SUCCESS) {
		fprintf(stderr, "dns_lib_init failed: %d\n", result);
		exit(1);
	}

	result = ctxs_init(&mctx, &actx, &taskmgr, &socketmgr,
			   &timermgr);
	if (result != ISC_R_SUCCESS) {
		fprintf(stderr, "ctx create failed: %d\n", result);
		exit(1);
	}

	isc_app_ctxstart(actx);

	result = dns_client_createx(mctx, actx, taskmgr, socketmgr,
				    timermgr, 0, &client);
	if (result != ISC_R_SUCCESS) {
		fprintf(stderr, "dns_client_createx failed: %d\n", result);
		exit(1);
	}

	/* Set local cache server */
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = AF_UNSPEC;
	hints.ai_socktype = SOCK_DGRAM;
	error = getaddrinfo(cacheserver, "53", &hints, &res);
	if (error != 0) {
		fprintf(stderr, "failed to convert server name (%s): %s\n",
			cacheserver, gai_strerror(error));
		exit(1);
	}

	if (res->ai_addrlen > sizeof(sa.type)) {
		fprintf(stderr,
			"assumption failure: addrlen is too long: %ld\n",
			(long)res->ai_addrlen);
		exit(1);
	}
	memcpy(&sa.type.sa, res->ai_addr, res->ai_addrlen);
	sa.length = res->ai_addrlen;
	freeaddrinfo(res);
	ISC_LINK_INIT(&sa, link);
	ISC_LIST_INIT(servers);
	ISC_LIST_APPEND(servers, &sa, link);
	result = dns_client_setservers(client, dns_rdataclass_in, NULL,
				       &servers);
	if (result != ISC_R_SUCCESS) {
		fprintf(stderr, "failed to set server: %d\n", result);
		exit(1);
	}

	/* Create the main task */
	probe_task = NULL;
	result = isc_task_create(taskmgr, 0, &probe_task);
	if (result != ISC_R_SUCCESS) {
		fprintf(stderr, "failed to create task: %d\n", result);
		exit(1);
	}

	/* Open input file */
	if (argc == 0)
		fp = stdin;
	else {
//.........这里部分代码省略.........

static isc_result_t
ns_interface_create(ns_interfacemgr_t *mgr, isc_sockaddr_t *addr,
		    const char *name, ns_interface_t **ifpret)
{
	ns_interface_t *ifp;
	isc_result_t result;
	int disp;

	REQUIRE(NS_INTERFACEMGR_VALID(mgr));

	ifp = isc_mem_get(mgr->mctx, sizeof(*ifp));
	if (ifp == NULL)
		return (ISC_R_NOMEMORY);

	ifp->mgr = NULL;
	ifp->generation = mgr->generation;
	ifp->addr = *addr;
	ifp->flags = 0;
	strncpy(ifp->name, name, sizeof(ifp->name));
	ifp->name[sizeof(ifp->name)-1] = '\0';
	ifp->clientmgr = NULL;

	result = isc_mutex_init(&ifp->lock);
	if (result != ISC_R_SUCCESS)
		goto lock_create_failure;

	result = ns_clientmgr_create(mgr->mctx, mgr->taskmgr,
				     ns_g_timermgr,
				     &ifp->clientmgr);
	if (result != ISC_R_SUCCESS) {
		isc_log_write(IFMGR_COMMON_LOGARGS, ISC_LOG_ERROR,
			      "ns_clientmgr_create() failed: %s",
			      isc_result_totext(result));
		goto clientmgr_create_failure;
	}

	for (disp = 0; disp < MAX_UDP_DISPATCH; disp++)
		ifp->udpdispatch[disp] = NULL;

	ifp->tcpsocket = NULL;

	/*
	 * Create a single TCP client object.  It will replace itself
	 * with a new one as soon as it gets a connection, so the actual
	 * connections will be handled in parallel even though there is
	 * only one client initially.
	 */
	ifp->ntcptarget = 1;
	ifp->ntcpcurrent = 0;
	ifp->nudpdispatch = 0;

	ISC_LINK_INIT(ifp, link);

	ns_interfacemgr_attach(mgr, &ifp->mgr);
	ISC_LIST_APPEND(mgr->interfaces, ifp, link);

	ifp->references = 1;
	ifp->magic = IFACE_MAGIC;
	*ifpret = ifp;

	return (ISC_R_SUCCESS);

 clientmgr_create_failure:
	DESTROYLOCK(&ifp->lock);

 lock_create_failure:
	ifp->magic = 0;
	isc_mem_put(mgr->mctx, ifp, sizeof(*ifp));

	return (ISC_R_UNEXPECTED);
}

ISC_TIMERFUNC_SCOPE isc_result_t
isc__timer_create(isc_timermgr_t *manager0, isc_timertype_t type,
		  isc_time_t *expires, isc_interval_t *interval,
		  isc_task_t *task, isc_taskaction_t action, const void *arg,
		  isc_timer_t **timerp)
{
	isc__timermgr_t *manager = (isc__timermgr_t *)manager0;
	isc__timer_t *timer;
	isc_result_t result;
	isc_time_t now;

	/*
	 * Create a new 'type' timer managed by 'manager'.  The timers
	 * parameters are specified by 'expires' and 'interval'.  Events
	 * will be posted to 'task' and when dispatched 'action' will be
	 * called with 'arg' as the arg value.  The new timer is returned
	 * in 'timerp'.
	 */

	REQUIRE(VALID_MANAGER(manager));
	REQUIRE(task != NULL);
	REQUIRE(action != NULL);
	if (expires == NULL)
		expires = isc_time_epoch;
	if (interval == NULL)
		interval = isc_interval_zero;
	REQUIRE(type == isc_timertype_inactive ||
		!(isc_time_isepoch(expires) && isc_interval_iszero(interval)));
	REQUIRE(timerp != NULL && *timerp == NULL);
	REQUIRE(type != isc_timertype_limited ||
		!(isc_time_isepoch(expires) || isc_interval_iszero(interval)));

	/*
	 * Get current time.
	 */
	if (type != isc_timertype_inactive) {
		TIME_NOW(&now);
	} else {
		/*
		 * We don't have to do this, but it keeps the compiler from
		 * complaining about "now" possibly being used without being
		 * set, even though it will never actually happen.
		 */
		isc_time_settoepoch(&now);
	}


	timer = isc_mem_get(manager->mctx, sizeof(*timer));
	if (timer == NULL)
		return (ISC_R_NOMEMORY);

	timer->manager = manager;
	timer->references = 1;

	if (type == isc_timertype_once && !isc_interval_iszero(interval)) {
		result = isc_time_add(&now, interval, &timer->idle);
		if (result != ISC_R_SUCCESS) {
			isc_mem_put(manager->mctx, timer, sizeof(*timer));
			return (result);
		}
	} else
		isc_time_settoepoch(&timer->idle);

	timer->type = type;
	timer->expires = *expires;
	timer->interval = *interval;
	timer->task = NULL;
	isc_task_attach(task, &timer->task);
	timer->action = action;
	/*
	 * Removing the const attribute from "arg" is the best of two
	 * evils here.  If the timer->arg member is made const, then
	 * it affects a great many recipients of the timer event
	 * which did not pass in an "arg" that was truly const.
	 * Changing isc_timer_create() to not have "arg" prototyped as const,
	 * though, can cause compilers warnings for calls that *do*
	 * have a truly const arg.  The caller will have to carefully
	 * keep track of whether arg started as a true const.
	 */
	DE_CONST(arg, timer->arg);
	timer->index = 0;
	result = isc_mutex_init(&timer->lock);
	if (result != ISC_R_SUCCESS) {
		isc_task_detach(&timer->task);
		isc_mem_put(manager->mctx, timer, sizeof(*timer));
		return (result);
	}
	ISC_LINK_INIT(timer, link);
	timer->common.impmagic = TIMER_MAGIC;
	timer->common.magic = ISCAPI_TIMER_MAGIC;
	timer->common.methods = (isc_timermethods_t *)&timermethods;

	LOCK(&manager->lock);

	/*
	 * Note we don't have to lock the timer like we normally would because
	 * there are no external references to it yet.
	 */

	if (type != isc_timertype_inactive)
//.........这里部分代码省略.........