bin/named/lwdgrbn.c

	lwdgrbn.c revision 0c27b3fe77ac1d5094ba3521e8142d9e7973133f
/*
 * Copyright (C) 2000, 2001, 2003-2007, 2009, 2013-2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

/* $Id: lwdgrbn.c,v 1.22 2009/09/02 23:48:01 tbox Exp $ */

/*! \file */

#include <config.h>

#include <isc/mem.h>
#include <isc/socket.h>
#include <isc/string.h>     /* Required for HP/UX (and others?) */
#include <isc/util.h>

#include <dns/db.h>
#include <dns/lookup.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/result.h>
#include <dns/view.h>

#include <named/types.h>
#include <named/lwdclient.h>
#include <named/lwresd.h>
#include <named/lwsearch.h>

static void start_lookup(ns_lwdclient_t *);

static isc_result_t
fill_array(int *pos, dns_rdataset_t *rdataset,
       int size, unsigned char **rdatas, lwres_uint16_t *rdatalen)
{
    dns_rdata_t rdata;
    isc_result_t result;
    isc_region_t r;

    UNUSED(size);

    dns_rdata_init(&rdata);
    for (result = dns_rdataset_first(rdataset);
         result == ISC_R_SUCCESS;
         result = dns_rdataset_next(rdataset))
    {
        INSIST(*pos < size);
        dns_rdataset_current(rdataset, &rdata);
        dns_rdata_toregion(&rdata, &r);
        rdatas[*pos] = r.base;
        rdatalen[*pos] = r.length;
        dns_rdata_reset(&rdata);
        (*pos)++;
    }
    if (result == ISC_R_NOMORE)
        result = ISC_R_SUCCESS;
    return (result);
}

static isc_result_t
iterate_node(lwres_grbnresponse_t *grbn, dns_db_t *db, dns_dbnode_t *node,
         isc_mem_t *mctx)
{
    int used = 0, count;
    int size = 8, oldsize = 0;
    unsigned char **rdatas = NULL, **oldrdatas = NULL, **newrdatas = NULL;
    lwres_uint16_t *lens = NULL, *oldlens = NULL, *newlens = NULL;
    dns_rdatasetiter_t *iter = NULL;
    dns_rdataset_t set;
    dns_ttl_t ttl = ISC_INT32_MAX;
    lwres_uint32_t flags = LWRDATA_VALIDATED;
    isc_result_t result = ISC_R_NOMEMORY;

    result = dns_db_allrdatasets(db, node, NULL, 0, &iter);
    if (result != ISC_R_SUCCESS)
        goto out;

    rdatas = isc_mem_get(mctx, size * sizeof(*rdatas));
    if (rdatas == NULL)
        goto out;
    lens = isc_mem_get(mctx, size * sizeof(*lens));
    if (lens == NULL)
        goto out;

    for (result = dns_rdatasetiter_first(iter);
         result == ISC_R_SUCCESS;
         result = dns_rdatasetiter_next(iter))
    {
        result = ISC_R_NOMEMORY;
        dns_rdataset_init(&set);
        dns_rdatasetiter_current(iter, &set);

        if (set.type != dns_rdatatype_rrsig) {
            dns_rdataset_disassociate(&set);
            continue;
        }

        count = dns_rdataset_count(&set);
        if (used + count > size) {
            /* copy & reallocate */
            oldsize = size;
            oldrdatas = rdatas;
            oldlens = lens;
            rdatas = NULL;
            lens = NULL;

            size *= 2;

            rdatas = isc_mem_get(mctx, size * sizeof(*rdatas));
            if (rdatas == NULL)
                goto out;
            lens = isc_mem_get(mctx, size * sizeof(*lens));
            if (lens == NULL)
                goto out;
            memmove(rdatas, oldrdatas, used * sizeof(*rdatas));
            memmove(lens, oldlens, used * sizeof(*lens));
            isc_mem_put(mctx, oldrdatas,
                    oldsize * sizeof(*oldrdatas));
            isc_mem_put(mctx, oldlens, oldsize * sizeof(*oldlens));
            oldrdatas = NULL;
            oldlens = NULL;
        }
        if (set.ttl < ttl)
            ttl = set.ttl;
        if (set.trust != dns_trust_secure)
            flags &= (~LWRDATA_VALIDATED);
        result = fill_array(&used, &set, size, rdatas, lens);
        dns_rdataset_disassociate(&set);
        if (result != ISC_R_SUCCESS)
            goto out;
    }
    if (result == ISC_R_NOMORE)
        result = ISC_R_SUCCESS;
    if (result != ISC_R_SUCCESS)
        goto out;
    dns_rdatasetiter_destroy(&iter);

    /*
     * If necessary, shrink and copy the arrays.
     */
    if (size != used) {
        result = ISC_R_NOMEMORY;
        newrdatas = isc_mem_get(mctx, used * sizeof(*rdatas));
        if (newrdatas == NULL)
            goto out;
        newlens = isc_mem_get(mctx, used * sizeof(*lens));
        if (newlens == NULL)
            goto out;
        memmove(newrdatas, rdatas, used * sizeof(*rdatas));
        memmove(newlens, lens, used * sizeof(*lens));
        isc_mem_put(mctx, rdatas, size * sizeof(*rdatas));
        isc_mem_put(mctx, lens, size * sizeof(*lens));
        grbn->rdatas = newrdatas;
        grbn->rdatalen = newlens;
    } else {
        grbn->rdatas = rdatas;
        grbn->rdatalen = lens;
    }
    grbn->nrdatas = used;
    grbn->ttl = ttl;
    grbn->flags = flags;
    return (ISC_R_SUCCESS);

 out:
    dns_rdatasetiter_destroy(&iter);
    if (rdatas != NULL)
        isc_mem_put(mctx, rdatas, size * sizeof(*rdatas));
    if (lens != NULL)
        isc_mem_put(mctx, lens, size * sizeof(*lens));
    if (oldrdatas != NULL)
        isc_mem_put(mctx, oldrdatas, oldsize * sizeof(*oldrdatas));
    if (oldlens != NULL)
        isc_mem_put(mctx, oldlens, oldsize * sizeof(*oldlens));
    if (newrdatas != NULL)
        isc_mem_put(mctx, newrdatas, used * sizeof(*newrdatas));
    return (result);
}

static void
lookup_done(isc_task_t *task, isc_event_t *event) {
    ns_lwdclient_t *client;
    ns_lwdclientmgr_t *cm;
    dns_lookupevent_t *levent;
    lwres_buffer_t lwb;
    dns_name_t *name;
    dns_rdataset_t *rdataset;
    dns_rdataset_t *sigrdataset;
    isc_result_t result;
    lwres_result_t lwresult;
    isc_region_t r;
    isc_buffer_t b;
    lwres_grbnresponse_t *grbn;
    int i;

    REQUIRE(event != NULL);

    UNUSED(task);

    lwb.base = NULL;
    client = event->ev_arg;
    cm = client->clientmgr;
    INSIST(client->lookup == (dns_lookup_t *)event->ev_sender);

    levent = (dns_lookupevent_t *)event;
    grbn = &client->grbn;

    ns_lwdclient_log(50, "lookup event result = %s",
             isc_result_totext(levent->result));

    result = levent->result;
    if (result != ISC_R_SUCCESS) {
        dns_lookup_destroy(&client->lookup);
        isc_event_free(&event);
        levent = NULL;

        switch (result) {
        case DNS_R_NXDOMAIN:
        case DNS_R_NCACHENXDOMAIN:
            result = ns_lwsearchctx_next(&client->searchctx);
            if (result != ISC_R_SUCCESS)
                lwresult = LWRES_R_NOTFOUND;
            else {
                start_lookup(client);
                return;
            }
            break;
        case DNS_R_NXRRSET:
        case DNS_R_NCACHENXRRSET:
            lwresult = LWRES_R_TYPENOTFOUND;
            break;
        default:
            lwresult = LWRES_R_FAILURE;
        }
        ns_lwdclient_errorpktsend(client, lwresult);
        return;
    }

    name = levent->name;
    b = client->recv_buffer;

    grbn->flags = 0;

    grbn->nrdatas = 0;
    grbn->rdatas = NULL;
    grbn->rdatalen = NULL;

    grbn->nsigs = 0;
    grbn->sigs = NULL;
    grbn->siglen = NULL;

    result = dns_name_totext(name, ISC_TRUE, &client->recv_buffer);
    if (result != ISC_R_SUCCESS)
        goto out;
    grbn->realname = (char *)isc_buffer_used(&b);
    grbn->realnamelen = isc_buffer_usedlength(&client->recv_buffer) -
                isc_buffer_usedlength(&b);
    ns_lwdclient_log(50, "found name '%.*s'", grbn->realnamelen,
             grbn->realname);

    grbn->rdclass = cm->view->rdclass;
    grbn->rdtype = client->rdtype;

    rdataset = levent->rdataset;
    if (rdataset != NULL) {
        /* The normal case */
        grbn->nrdatas = dns_rdataset_count(rdataset);
        grbn->rdatas = isc_mem_get(cm->mctx, grbn->nrdatas *
                       sizeof(unsigned char *));
        if (grbn->rdatas == NULL)
            goto out;
        grbn->rdatalen = isc_mem_get(cm->mctx, grbn->nrdatas *
                         sizeof(lwres_uint16_t));
        if (grbn->rdatalen == NULL)
            goto out;

        i = 0;
        result = fill_array(&i, rdataset, grbn->nrdatas, grbn->rdatas,
                    grbn->rdatalen);
        if (result != ISC_R_SUCCESS)
            goto out;
        INSIST(i == grbn->nrdatas);
        grbn->ttl = rdataset->ttl;
        if (rdataset->trust == dns_trust_secure)
            grbn->flags |= LWRDATA_VALIDATED;
    } else {
        /* The SIG query case */
        result = iterate_node(grbn, levent->db, levent->node,
                      cm->mctx);
        if (result != ISC_R_SUCCESS)
            goto out;
    }
    ns_lwdclient_log(50, "filled in %d rdata%s", grbn->nrdatas,
             (grbn->nrdatas == 1) ? "" : "s");

    sigrdataset = levent->sigrdataset;
    if (sigrdataset != NULL) {
        grbn->nsigs = dns_rdataset_count(sigrdataset);
        grbn->sigs = isc_mem_get(cm->mctx, grbn->nsigs *
                     sizeof(unsigned char *));
        if (grbn->sigs == NULL)
            goto out;
        grbn->siglen = isc_mem_get(cm->mctx, grbn->nsigs *
                       sizeof(lwres_uint16_t));
        if (grbn->siglen == NULL)
            goto out;

        i = 0;
        result = fill_array(&i, sigrdataset, grbn->nsigs, grbn->sigs,
                    grbn->siglen);
        if (result != ISC_R_SUCCESS)
            goto out;
        INSIST(i == grbn->nsigs);
        ns_lwdclient_log(50, "filled in %d signature%s", grbn->nsigs,
                 (grbn->nsigs == 1) ? "" : "s");
    }

    /*
     * Render the packet.
     */
    client->pkt.recvlength = LWRES_RECVLENGTH;
    client->pkt.authtype = 0; /* XXXMLG */
    client->pkt.authlength = 0;
    client->pkt.result = LWRES_R_SUCCESS;

    lwresult = lwres_grbnresponse_render(cm->lwctx,
                         grbn, &client->pkt, &lwb);
    if (lwresult != LWRES_R_SUCCESS)
        goto out;

    isc_mem_put(cm->mctx, grbn->rdatas,
            grbn->nrdatas * sizeof(unsigned char *));
    isc_mem_put(cm->mctx, grbn->rdatalen,
            grbn->nrdatas * sizeof(lwres_uint16_t));

    if (grbn->sigs != NULL)
        isc_mem_put(cm->mctx, grbn->sigs,
                grbn->nsigs * sizeof(unsigned char *));
    if (grbn->siglen != NULL)
        isc_mem_put(cm->mctx, grbn->siglen,
                grbn->nsigs * sizeof(lwres_uint16_t));

    r.base = lwb.base;
    r.length = lwb.used;
    client->sendbuf = r.base;
    client->sendlength = r.length;
    result = ns_lwdclient_sendreply(client, &r);
    if (result != ISC_R_SUCCESS)
        goto out2;

    NS_LWDCLIENT_SETSEND(client);

    dns_lookup_destroy(&client->lookup);
    isc_event_free(&event);

    return;

 out:
    if (grbn->rdatas != NULL)
        isc_mem_put(cm->mctx, grbn->rdatas,
                grbn->nrdatas * sizeof(unsigned char *));
    if (grbn->rdatalen != NULL)
        isc_mem_put(cm->mctx, grbn->rdatalen,
                grbn->nrdatas * sizeof(lwres_uint16_t));

    if (grbn->sigs != NULL)
        isc_mem_put(cm->mctx, grbn->sigs,
                grbn->nsigs * sizeof(unsigned char *));
    if (grbn->siglen != NULL)
        isc_mem_put(cm->mctx, grbn->siglen,
                grbn->nsigs * sizeof(lwres_uint16_t));
 out2:
    if (client->lookup != NULL)
        dns_lookup_destroy(&client->lookup);
    if (lwb.base != NULL)
        lwres_context_freemem(cm->lwctx, lwb.base, lwb.length);

    isc_event_free(&event);

    ns_lwdclient_log(50, "error constructing getrrsetbyname response");
    ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
}

static void
start_lookup(ns_lwdclient_t *client) {
    isc_result_t result;
    ns_lwdclientmgr_t *cm;
    dns_fixedname_t absname;

    cm = client->clientmgr;

    INSIST(client->lookup == NULL);

    dns_fixedname_init(&absname);
    result = ns_lwsearchctx_current(&client->searchctx,
                    dns_fixedname_name(&absname));
    /*
     * This will return failure if relative name + suffix is too long.
     * In this case, just go on to the next entry in the search path.
     */
    if (result != ISC_R_SUCCESS)
        start_lookup(client);

    result = dns_lookup_create(cm->mctx,
                   dns_fixedname_name(&absname),
                   client->rdtype, cm->view,
                   client->options, cm->task, lookup_done,
                   client, &client->lookup);
    if (result != ISC_R_SUCCESS) {
        ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
        return;
    }
}

static void
init_grbn(ns_lwdclient_t *client) {
    client->grbn.rdclass = 0;
    client->grbn.rdtype = 0;
    client->grbn.ttl = 0;
    client->grbn.nrdatas = 0;
    client->grbn.realname = NULL;
    client->grbn.realnamelen = 0;
    client->grbn.rdatas = 0;
    client->grbn.rdatalen = 0;
    client->grbn.base = NULL;
    client->grbn.baselen = 0;
    isc_buffer_init(&client->recv_buffer, client->buffer, LWRES_RECVLENGTH);
}

void
ns_lwdclient_processgrbn(ns_lwdclient_t *client, lwres_buffer_t *b) {
    lwres_grbnrequest_t *req;
    isc_result_t result;
    ns_lwdclientmgr_t *cm;
    isc_buffer_t namebuf;

    REQUIRE(NS_LWDCLIENT_ISRECVDONE(client));
    INSIST(client->byaddr == NULL);

    cm = client->clientmgr;
    req = NULL;

    result = lwres_grbnrequest_parse(cm->lwctx,
                     b, &client->pkt, &req);
    if (result != LWRES_R_SUCCESS)
        goto out;
    if (req->name == NULL)
        goto out;

    client->options = 0;
    if (req->rdclass != cm->view->rdclass)
        goto out;

    if (req->rdclass == dns_rdataclass_any ||
        req->rdtype == dns_rdatatype_any)
        goto out;

    client->rdtype = req->rdtype;

    isc_buffer_init(&namebuf, req->name, req->namelen);
    isc_buffer_add(&namebuf, req->namelen);

    dns_fixedname_init(&client->query_name);
    result = dns_name_fromtext(dns_fixedname_name(&client->query_name),
                   &namebuf, NULL, 0, NULL);
    if (result != ISC_R_SUCCESS)
        goto out;
    ns_lwsearchctx_init(&client->searchctx,
                cm->listener->manager->search,
                dns_fixedname_name(&client->query_name),
                cm->listener->manager->ndots);
    ns_lwsearchctx_first(&client->searchctx);

    ns_lwdclient_log(50, "client %p looking for type %d",
             client, client->rdtype);

    /*
     * We no longer need to keep this around.
     */
    lwres_grbnrequest_free(cm->lwctx, &req);

    /*
     * Initialize the real name and alias arrays in the reply we're
     * going to build up.
     */
    init_grbn(client);

    /*
     * Start the find.
     */
    start_lookup(client);

    return;

    /*
     * We're screwed.  Return an error packet to our caller.
     */
 out:
    if (req != NULL)
        lwres_grbnrequest_free(cm->lwctx, &req);

    ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
}