/*% Uses context ctx to convert the contents of packet pkt to a lwres_gnbarequest_t structure. */
lwres_result_t
lwres_gnbarequest_parse (lwres_context_t * ctx, lwres_buffer_t * b,
lwres_lwpacket_t * pkt, lwres_gnbarequest_t ** structp)
{
int ret;
lwres_gnbarequest_t *gnba;
REQUIRE (ctx != NULL);
REQUIRE (pkt != NULL);
REQUIRE (b != NULL);
REQUIRE (structp != NULL && *structp == NULL);
if ((pkt->pktflags & LWRES_LWPACKETFLAG_RESPONSE) != 0)
return (LWRES_R_FAILURE);
if (!SPACE_REMAINING (b, 4))
return (LWRES_R_UNEXPECTEDEND);
gnba = CTXMALLOC (sizeof (lwres_gnbarequest_t));
if (gnba == NULL)
return (LWRES_R_NOMEMORY);
gnba->flags = lwres_buffer_getuint32 (b);
ret = lwres_addr_parse (b, &gnba->addr);
if (ret != LWRES_R_SUCCESS)
goto out;
if (LWRES_BUFFER_REMAINING (b) != 0)
{
ret = LWRES_R_TRAILINGDATA;
goto out;
}
*structp = gnba;
return (LWRES_R_SUCCESS);
out:
if (gnba != NULL)
lwres_gnbarequest_free (ctx, &gnba);
return (ret);
}
void
ns_lwdclient_processgnba(ns_lwdclient_t *client, lwres_buffer_t *b) {
lwres_gnbarequest_t *req;
isc_result_t result;
isc_sockaddr_t sa;
ns_lwdclientmgr_t *cm;
REQUIRE(NS_LWDCLIENT_ISRECVDONE(client));
INSIST(client->byaddr == NULL);
cm = client->clientmgr;
req = NULL;
result = lwres_gnbarequest_parse(cm->lwctx,
b, &client->pkt, &req);
if (result != LWRES_R_SUCCESS)
goto out;
client->options = 0;
if (req->addr.family == LWRES_ADDRTYPE_V4) {
client->na.family = AF_INET;
if (req->addr.length != 4)
goto out;
memcpy(&client->na.type.in, req->addr.address, 4);
} else if (req->addr.family == LWRES_ADDRTYPE_V6) {
client->na.family = AF_INET6;
if (req->addr.length != 16)
goto out;
memcpy(&client->na.type.in6, req->addr.address, 16);
} else {
goto out;
}
isc_sockaddr_fromnetaddr(&sa, &client->na, 53);
ns_lwdclient_log(50, "client %p looking for addrtype %08x",
client, req->addr.family);
/*
* We no longer need to keep this around.
*/
lwres_gnbarequest_free(cm->lwctx, &req);
/*
* Initialize the real name and alias arrays in the reply we're
* going to build up.
*/
init_gnba(client);
client->options = 0;
/*
* Start the find.
*/
start_byaddr(client);
return;
/*
* We're screwed. Return an error packet to our caller.
*/
out:
if (req != NULL)
lwres_gnbarequest_free(cm->lwctx, &req);
ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
}
