process_gnba.c revision 15a44745412679c30a6d022733925af70a38b715
/*
* Copyright (C) 2000 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: process_gnba.c,v 1.25 2000/07/27 09:36:44 tale Exp $ */
#include <config.h>
#include <isc/socket.h>
#include <isc/string.h> /* Required for HP/UX (and others?) */
#include <isc/util.h>
#include <dns/adb.h>
#include <dns/byaddr.h>
#include <dns/result.h>
#include "client.h"
static void start_byaddr(client_t *);
static void
byaddr_done(isc_task_t *task, isc_event_t *event) {
client_t *client;
clientmgr_t *cm;
dns_byaddrevent_t *bevent;
int lwres;
lwres_buffer_t lwb;
dns_name_t *name;
isc_result_t result;
isc_region_t r;
isc_buffer_t b;
lwres_gnbaresponse_t *gnba;
isc_uint16_t naliases;
isc_stdtime_t now;
UNUSED(task);
lwb.base = NULL;
client = event->ev_arg;
cm = client->clientmgr;
INSIST(client->byaddr == (dns_byaddr_t *)event->ev_sender);
bevent = (dns_byaddrevent_t *)event;
gnba = &client->gnba;
DP(50, "byaddr event result = %s",
isc_result_totext(bevent->result));
result = bevent->result;
if (result != ISC_R_SUCCESS) {
dns_byaddr_destroy(&client->byaddr);
isc_event_free(&event);
bevent = NULL;
/*
* Were we trying bitstring or nibble mode? If bitstring,
* and we got FORMERROR or SERVFAIL, set the flag to
* avoid bitstring lables for 10 minutes. If we got any
* other error (NXDOMAIN, etc) just try again without
* bitstrings, and let our cache handle the negative answer
* for bitstrings.
*/
if ((client->options & DNS_BYADDROPT_IPV6NIBBLE) != 0) {
dns_adb_freeaddrinfo(cm->view->adb, &client->addrinfo);
error_pkt_send(client, LWRES_R_FAILURE);
return;
}
isc_stdtime_get(&now);
if (result == DNS_R_FORMERR ||
result == DNS_R_SERVFAIL ||
result == ISC_R_FAILURE)
dns_adb_setavoidbitstring(cm->view->adb,
client->addrinfo, now + 600);
/*
* Fall back to nibble reverse if the default of bitstrings
* fails.
*/
client->options |= DNS_BYADDROPT_IPV6NIBBLE;
start_byaddr(client);
return;
}
name = ISC_LIST_HEAD(bevent->names);
while (name != NULL) {
b = client->recv_buffer;
result = dns_name_totext(name, ISC_TRUE, &client->recv_buffer);
if (result != ISC_R_SUCCESS)
goto out;
DP(50, "found name '%.*s'",
client->recv_buffer.used - b.used,
(char *)(b.base) + b.used);
if (gnba->realname == NULL) {
gnba->realname = (char *)(b.base) + b.used;
gnba->realnamelen = client->recv_buffer.used - b.used;
} else {
naliases = gnba->naliases;
if (naliases >= LWRES_MAX_ALIASES)
break;
gnba->aliases[naliases] = (char *)(b.base) + b.used;
gnba->aliaslen[naliases] =
client->recv_buffer.used - b.used;
gnba->naliases++;
}
name = ISC_LIST_NEXT(name, link);
}
dns_byaddr_destroy(&client->byaddr);
dns_adb_freeaddrinfo(cm->view->adb, &client->addrinfo);
isc_event_free(&event);
/*
* Render the packet.
*/
client->pkt.recvlength = LWRES_RECVLENGTH;
client->pkt.authtype = 0; /* XXXMLG */
client->pkt.authlength = 0;
client->pkt.result = LWRES_R_SUCCESS;
lwres = lwres_gnbaresponse_render(cm->lwctx,
gnba, &client->pkt, &lwb);
if (lwres != LWRES_R_SUCCESS)
goto out;
r.base = lwb.base;
r.length = lwb.used;
client->sendbuf = r.base;
client->sendlength = r.length;
result = isc_socket_sendto(cm->sock, &r,
cm->task, client_send,
client, &client->address, NULL);
if (result != ISC_R_SUCCESS)
goto out;
CLIENT_SETSEND(client);
return;
out:
if (client->byaddr != NULL)
dns_byaddr_destroy(&client->byaddr);
if (client->addrinfo != NULL)
dns_adb_freeaddrinfo(cm->view->adb, &client->addrinfo);
if (lwb.base != NULL)
lwres_context_freemem(cm->lwctx,
lwb.base, lwb.length);
isc_event_free(&event);
}
static void
start_byaddr(client_t *client) {
isc_result_t result;
clientmgr_t *cm;
cm = client->clientmgr;
INSIST(client->byaddr == NULL);
result = dns_byaddr_create(cm->mctx, &client->na, cm->view,
client->options, cm->task, byaddr_done,
client, &client->byaddr);
if (result != ISC_R_SUCCESS) {
dns_adb_freeaddrinfo(cm->view->adb, &client->addrinfo);
error_pkt_send(client, LWRES_R_FAILURE);
return;
}
}
void
process_gnba(client_t *client, lwres_buffer_t *b) {
lwres_gnbarequest_t *req;
isc_result_t result;
isc_sockaddr_t sa;
clientmgr_t *cm;
REQUIRE(CLIENT_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;
if (req->addr.address == NULL)
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);
DP(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.
*/
client_init_gnba(client);
client->options = 0;
/*
* See if we should skip the byaddr bit.
*/
INSIST(client->addrinfo == NULL);
result = dns_adb_findaddrinfo(cm->view->adb, &sa,
&client->addrinfo, 0);
if (result != ISC_R_SUCCESS)
goto out;
if (client->addrinfo->avoid_bitstring > 0)
client->options |= DNS_BYADDROPT_IPV6NIBBLE;
/*
* 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);
error_pkt_send(client, LWRES_R_FAILURE);
}