bin/named/config.c

	config.c revision 0c27b3fe77ac1d5094ba3521e8142d9e7973133f
/*
 * Copyright (C) 2001-2016  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/.
 */

/*! \file */

#include <config.h>

#include <stdlib.h>

#include <isc/buffer.h>
#include <isc/log.h>
#include <isc/mem.h>
#include <isc/parseint.h>
#include <isc/region.h>
#include <isc/result.h>
#include <isc/sockaddr.h>
#include <isc/string.h>
#include <isc/util.h>

#include <isccfg/namedconf.h>

#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/rdataclass.h>
#include <dns/rdatatype.h>
#include <dns/tsig.h>
#include <dns/zone.h>

#include <dst/dst.h>

#include <named/config.h>
#include <named/globals.h>

#include <bind.keys.h>

/*% default configuration */
static char defaultconf[] = "\
options {\n\
    automatic-interface-scan yes;\n\
    bindkeys-file \"" NS_SYSCONFDIR "/bind.keys\";\n\
#   blackhole {none;};\n"
#if defined(HAVE_OPENSSL_AES) || defined(HAVE_OPENSSL_EVP_AES)
"   cookie-algorithm aes;\n"
#else
"   cookie-algorithm sha256;\n"
#endif
#ifndef WIN32
"   coresize default;\n\
    datasize default;\n\
    files unlimited;\n\
    stacksize default;\n"
#endif
"#  session-keyfile \"" NS_LOCALSTATEDIR "/run/named/session.key\";\n\
    session-keyname local-ddns;\n\
    session-keyalg hmac-sha256;\n\
#   deallocate-on-exit <obsolete>;\n\
#   directory <none>\n\
    dump-file \"named_dump.db\";\n\
#   fake-iquery <obsolete>;\n\
#   has-old-clients <obsolete>;\n\
    heartbeat-interval 60;\n\
#   host-statistics <obsolete>;\n\
    interface-interval 60;\n\
#   keep-response-order {none;};\n\
    listen-on {any;};\n\
    listen-on-v6 {any;};\n\
    match-mapped-addresses no;\n\
    max-rsa-exponent-size 0; /* no limit */\n\
    memstatistics-file \"named.memstats\";\n\
#   multiple-cnames <obsolete>;\n\
#   named-xfer <obsolete>;\n\
    nta-lifetime 3600;\n\
    nta-recheck 300;\n\
    notify-rate 20;\n\
#   pid-file \"" NS_LOCALSTATEDIR "/run/named/named.pid\"; /* or /lwresd.pid */\n\
#   lock-file \"" NS_LOCALSTATEDIR "/run/named/named.lock\";\n\
    port 53;\n\
    prefetch 2 9;\n\
    recursing-file \"named.recursing\";\n\
    secroots-file \"named.secroots\";\n\
"
#ifdef PATH_RANDOMDEV
"\
    random-device \"" PATH_RANDOMDEV "\";\n\
"
#endif
"\
    recursive-clients 1000;\n\
    resolver-query-timeout 10;\n\
    rrset-order { order random; };\n\
#   serial-queries <obsolete>;\n\
    serial-query-rate 20;\n\
    server-id none;\n\
    startup-notify-rate 20;\n\
    statistics-file \"named.stats\";\n\
#   statistics-interval <obsolete>;\n\
    tcp-clients 150;\n\
    tcp-listen-queue 10;\n\
#   tkey-dhkey <none>\n\
#   tkey-gssapi-credential <none>\n\
#   tkey-domain <none>\n\
    transfer-message-size 20480;\n\
    transfers-per-ns 2;\n\
    transfers-in 10;\n\
    transfers-out 10;\n\
#   treat-cr-as-space <obsolete>;\n\
#   use-id-pool <obsolete>;\n\
#   use-ixfr <obsolete>;\n\
    edns-udp-size 4096;\n\
    max-udp-size 4096;\n\
    nocookie-udp-size 4096;\n\
    send-cookie true;\n\
    request-nsid false;\n\
    reserved-sockets 512;\n\
\n\
    /* DLV */\n\
    dnssec-lookaside . trust-anchor dlv.isc.org;\n\
\n\
    /* view */\n\
    allow-notify {none;};\n\
    allow-update-forwarding {none;};\n\
    allow-query-cache { localnets; localhost; };\n\
    allow-query-cache-on { any; };\n\
    allow-recursion { localnets; localhost; };\n\
    allow-recursion-on { any; };\n\
#   allow-v6-synthesis <obsolete>;\n\
#   sortlist <none>\n\
#   topology <none>\n\
    auth-nxdomain false;\n\
    minimal-any false;\n\
    minimal-responses false;\n\
    recursion true;\n\
    provide-ixfr true;\n\
    request-ixfr true;\n\
    request-expire true;\n\
#   fetch-glue <obsolete>;\n\
#   rfc2308-type1 <obsolete>;\n\
    additional-from-auth true;\n\
    additional-from-cache true;\n\
    query-source address *;\n\
    query-source-v6 address *;\n\
    notify-source *;\n\
    notify-source-v6 *;\n\
    cleaning-interval 0;  /* now meaningless */\n\
#   min-roots <obsolete>;\n\
    lame-ttl 600;\n\
    servfail-ttl 1;\n\
    max-ncache-ttl 10800; /* 3 hours */\n\
    max-cache-ttl 604800; /* 1 week */\n\
    transfer-format many-answers;\n\
    max-cache-size 90%;\n\
    check-names master fail;\n\
    check-names slave warn;\n\
    check-names response ignore;\n\
    check-dup-records warn;\n\
    check-mx warn;\n\
    check-spf warn;\n\
    acache-enable no;\n\
    acache-cleaning-interval 60;\n\
    max-acache-size 16M;\n\
    dnssec-enable yes;\n\
    dnssec-validation yes; \n\
    dnssec-accept-expired no;\n\
    fetches-per-zone 0;\n\
    fetch-quota-params 100 0.1 0.3 0.7;\n\
    clients-per-query 10;\n\
    max-clients-per-query 100;\n\
    max-recursion-depth 7;\n\
    max-recursion-queries 75;\n\
    zero-no-soa-ttl-cache no;\n\
    nsec3-test-zone no;\n\
    allow-new-zones no;\n\
    fetches-per-server 0;\n\
    require-server-cookie no;\n\
    v6-bias 50;\n\
    message-compression yes;\n\
"
#ifdef HAVE_DNSTAP
"\
    dnstap-identity hostname;\n\
"
#endif
#ifdef HAVE_GEOIP
"\
    geoip-use-ecs yes;\n\
"
#endif
#ifdef ALLOW_FILTER_AAAA
"   filter-aaaa-on-v4 no;\n\
    filter-aaaa-on-v6 no;\n\
    filter-aaaa { any; };\n\
"
#endif

"   /* zone */\n\
    allow-query {any;};\n\
    allow-query-on {any;};\n\
    allow-transfer {any;};\n\
    notify yes;\n\
#   also-notify <none>\n\
    notify-delay 5;\n\
    notify-to-soa no;\n\
    dialup no;\n\
#   forward <none>\n\
#   forwarders <none>\n\
#   maintain-ixfr-base <obsolete>;\n\
#   max-ixfr-log-size <obsolete>\n\
    transfer-source *;\n\
    transfer-source-v6 *;\n\
    alt-transfer-source *;\n\
    alt-transfer-source-v6 *;\n\
    max-transfer-time-in 120;\n\
    max-transfer-time-out 120;\n\
    max-transfer-idle-in 60;\n\
    max-transfer-idle-out 60;\n\
    max-retry-time 1209600; /* 2 weeks */\n\
    min-retry-time 500;\n\
    max-refresh-time 2419200; /* 4 weeks */\n\
    min-refresh-time 300;\n\
    multi-master no;\n\
    dnssec-secure-to-insecure no;\n\
    sig-validity-interval 30; /* days */\n\
    sig-signing-nodes 100;\n\
    sig-signing-signatures 10;\n\
    sig-signing-type 65534;\n\
    inline-signing no;\n\
    zone-statistics terse;\n\
    max-journal-size unlimited;\n\
    ixfr-from-differences false;\n\
    check-wildcard yes;\n\
    check-sibling yes;\n\
    check-integrity yes;\n\
    check-mx-cname warn;\n\
    check-srv-cname warn;\n\
    zero-no-soa-ttl yes;\n\
    update-check-ksk yes;\n\
    serial-update-method increment;\n\
    dnssec-update-mode maintain;\n\
    dnssec-dnskey-kskonly no;\n\
    dnssec-loadkeys-interval 60;\n\
    try-tcp-refresh yes; /* BIND 8 compat */\n\
};\n\
"

"#\n\
#  Zones in the \"_bind\" view are NOT counted in the count of zones.\n\
#\n\
view \"_bind\" chaos {\n\
    recursion no;\n\
    notify no;\n\
    allow-new-zones no;\n\
\n\
    # Prevent use of this zone in DNS amplified reflection DoS attacks\n\
    rate-limit {\n\
        responses-per-second 3;\n\
        slip 0;\n\
        min-table-size 10;\n\
    };\n\
\n\
    zone \"version.bind\" chaos {\n\
        type master;\n\
        database \"_builtin version\";\n\
    };\n\
\n\
    zone \"hostname.bind\" chaos {\n\
        type master;\n\
        database \"_builtin hostname\";\n\
    };\n\
\n\
    zone \"authors.bind\" chaos {\n\
        type master;\n\
        database \"_builtin authors\";\n\
    };\n\
\n\
    zone \"id.server\" chaos {\n\
        type master;\n\
        database \"_builtin id\";\n\
    };\n\
};\n\
"
"#\n\
#  Default trusted key(s) for builtin DLV support\n\
#  (used if \"dnssec-lookaside auto;\" is set and\n\
#  sysconfdir/bind.keys doesn't exist).\n\
#\n\
# BEGIN MANAGED KEYS\n"

/* Imported from bind.keys.h: */
MANAGED_KEYS

"# END MANAGED KEYS\n\
";

isc_result_t
ns_config_parsedefaults(cfg_parser_t *parser, cfg_obj_t **conf) {
    isc_buffer_t b;

    isc_buffer_init(&b, defaultconf, sizeof(defaultconf) - 1);
    isc_buffer_add(&b, sizeof(defaultconf) - 1);
    return (cfg_parse_buffer2(parser, &b, __FILE__,
                  &cfg_type_namedconf, conf));
}

isc_result_t
ns_config_get(cfg_obj_t const * const *maps, const char *name,
          const cfg_obj_t **obj)
{
    int i;

    for (i = 0;; i++) {
        if (maps[i] == NULL)
            return (ISC_R_NOTFOUND);
        if (cfg_map_get(maps[i], name, obj) == ISC_R_SUCCESS)
            return (ISC_R_SUCCESS);
    }
}

isc_result_t
ns_checknames_get(const cfg_obj_t **maps, const char *which,
          const cfg_obj_t **obj)
{
    const cfg_listelt_t *element;
    const cfg_obj_t *checknames;
    const cfg_obj_t *type;
    const cfg_obj_t *value;
    int i;

    for (i = 0;; i++) {
        if (maps[i] == NULL)
            return (ISC_R_NOTFOUND);
        checknames = NULL;
        if (cfg_map_get(maps[i], "check-names",
                &checknames) == ISC_R_SUCCESS) {
            /*
             * Zone map entry is not a list.
             */
            if (checknames != NULL && !cfg_obj_islist(checknames)) {
                *obj = checknames;
                return (ISC_R_SUCCESS);
            }
            for (element = cfg_list_first(checknames);
                 element != NULL;
                 element = cfg_list_next(element)) {
                value = cfg_listelt_value(element);
                type = cfg_tuple_get(value, "type");
                if (strcasecmp(cfg_obj_asstring(type),
                           which) == 0) {
                    *obj = cfg_tuple_get(value, "mode");
                    return (ISC_R_SUCCESS);
                }
            }

        }
    }
}

int
ns_config_listcount(const cfg_obj_t *list) {
    const cfg_listelt_t *e;
    int i = 0;

    for (e = cfg_list_first(list); e != NULL; e = cfg_list_next(e))
        i++;

    return (i);
}

isc_result_t
ns_config_getclass(const cfg_obj_t *classobj, dns_rdataclass_t defclass,
           dns_rdataclass_t *classp) {
    isc_textregion_t r;
    isc_result_t result;

    if (!cfg_obj_isstring(classobj)) {
        *classp = defclass;
        return (ISC_R_SUCCESS);
    }
    DE_CONST(cfg_obj_asstring(classobj), r.base);
    r.length = strlen(r.base);
    result = dns_rdataclass_fromtext(classp, &r);
    if (result != ISC_R_SUCCESS)
        cfg_obj_log(classobj, ns_g_lctx, ISC_LOG_ERROR,
                "unknown class '%s'", r.base);
    return (result);
}

isc_result_t
ns_config_gettype(const cfg_obj_t *typeobj, dns_rdatatype_t deftype,
           dns_rdatatype_t *typep) {
    isc_textregion_t r;
    isc_result_t result;

    if (!cfg_obj_isstring(typeobj)) {
        *typep = deftype;
        return (ISC_R_SUCCESS);
    }
    DE_CONST(cfg_obj_asstring(typeobj), r.base);
    r.length = strlen(r.base);
    result = dns_rdatatype_fromtext(typep, &r);
    if (result != ISC_R_SUCCESS)
        cfg_obj_log(typeobj, ns_g_lctx, ISC_LOG_ERROR,
                "unknown type '%s'", r.base);
    return (result);
}

dns_zonetype_t
ns_config_getzonetype(const cfg_obj_t *zonetypeobj) {
    dns_zonetype_t ztype = dns_zone_none;
    const char *str;

    str = cfg_obj_asstring(zonetypeobj);
    if (strcasecmp(str, "master") == 0)
        ztype = dns_zone_master;
    else if (strcasecmp(str, "slave") == 0)
        ztype = dns_zone_slave;
    else if (strcasecmp(str, "stub") == 0)
        ztype = dns_zone_stub;
    else if (strcasecmp(str, "static-stub") == 0)
        ztype = dns_zone_staticstub;
    else if (strcasecmp(str, "redirect") == 0)
        ztype = dns_zone_redirect;
    else
        INSIST(0);
    return (ztype);
}

isc_result_t
ns_config_getiplist(const cfg_obj_t *config, const cfg_obj_t *list,
            in_port_t defport, isc_mem_t *mctx,
            isc_sockaddr_t **addrsp, isc_dscp_t **dscpsp,
            isc_uint32_t *countp)
{
    int count, i = 0;
    const cfg_obj_t *addrlist;
    const cfg_obj_t *portobj, *dscpobj;
    const cfg_listelt_t *element;
    isc_sockaddr_t *addrs;
    in_port_t port;
    isc_dscp_t dscp = -1, *dscps = NULL;
    isc_result_t result;

    INSIST(addrsp != NULL && *addrsp == NULL);
    INSIST(dscpsp == NULL || *dscpsp == NULL);
    INSIST(countp != NULL);

    addrlist = cfg_tuple_get(list, "addresses");
    count = ns_config_listcount(addrlist);

    portobj = cfg_tuple_get(list, "port");
    if (cfg_obj_isuint32(portobj)) {
        isc_uint32_t val = cfg_obj_asuint32(portobj);
        if (val > ISC_UINT16_MAX) {
            cfg_obj_log(portobj, ns_g_lctx, ISC_LOG_ERROR,
                    "port '%u' out of range", val);
            return (ISC_R_RANGE);
        }
        port = (in_port_t) val;
    } else if (defport != 0)
        port = defport;
    else {
        result = ns_config_getport(config, &port);
        if (result != ISC_R_SUCCESS)
            return (result);
    }

    if (dscpsp != NULL) {
        dscpobj = cfg_tuple_get(list, "dscp");
        if (dscpobj != NULL && cfg_obj_isuint32(dscpobj)) {
            if (cfg_obj_asuint32(dscpobj) > 63) {
                cfg_obj_log(dscpobj, ns_g_lctx, ISC_LOG_ERROR,
                        "dscp value '%u' is out of range",
                        cfg_obj_asuint32(dscpobj));
                return (ISC_R_RANGE);
            }
            dscp = (isc_dscp_t)cfg_obj_asuint32(dscpobj);
        }

        dscps = isc_mem_get(mctx, count * sizeof(isc_dscp_t));
        if (dscps == NULL)
            return (ISC_R_NOMEMORY);
    }

    addrs = isc_mem_get(mctx, count * sizeof(isc_sockaddr_t));
    if (addrs == NULL) {
        if (dscps != NULL)
            isc_mem_put(mctx, dscps, count * sizeof(isc_dscp_t));
        return (ISC_R_NOMEMORY);
    }

    for (element = cfg_list_first(addrlist);
         element != NULL;
         element = cfg_list_next(element), i++)
    {
        const cfg_obj_t *addr;
        INSIST(i < count);
        addr = cfg_listelt_value(element);
        addrs[i] = *cfg_obj_assockaddr(addr);
        if (dscpsp != NULL) {
            isc_dscp_t innerdscp;
            innerdscp = cfg_obj_getdscp(addr);
            if (innerdscp == -1)
                innerdscp = dscp;
            dscps[i] = innerdscp;
        }
        if (isc_sockaddr_getport(&addrs[i]) == 0)
            isc_sockaddr_setport(&addrs[i], port);
    }
    INSIST(i == count);

    *addrsp = addrs;
    *countp = count;

    if (dscpsp != NULL)
        *dscpsp = dscps;

    return (ISC_R_SUCCESS);
}

void
ns_config_putiplist(isc_mem_t *mctx, isc_sockaddr_t **addrsp,
            isc_dscp_t **dscpsp, isc_uint32_t count)
{
    INSIST(addrsp != NULL && *addrsp != NULL);
    INSIST(dscpsp == NULL || *dscpsp != NULL);

    isc_mem_put(mctx, *addrsp, count * sizeof(isc_sockaddr_t));
    *addrsp = NULL;

    if (dscpsp != NULL) {
        isc_mem_put(mctx, *dscpsp, count * sizeof(isc_dscp_t));
        *dscpsp = NULL;
    }
}

static isc_result_t
get_masters_def(const cfg_obj_t *cctx, const char *name,
        const cfg_obj_t **ret)
{
    isc_result_t result;
    const cfg_obj_t *masters = NULL;
    const cfg_listelt_t *elt;

    result = cfg_map_get(cctx, "masters", &masters);
    if (result != ISC_R_SUCCESS)
        return (result);
    for (elt = cfg_list_first(masters);
         elt != NULL;
         elt = cfg_list_next(elt)) {
        const cfg_obj_t *list;
        const char *listname;

        list = cfg_listelt_value(elt);
        listname = cfg_obj_asstring(cfg_tuple_get(list, "name"));

        if (strcasecmp(listname, name) == 0) {
            *ret = list;
            return (ISC_R_SUCCESS);
        }
    }
    return (ISC_R_NOTFOUND);
}

isc_result_t
ns_config_getipandkeylist(const cfg_obj_t *config, const cfg_obj_t *list,
              isc_mem_t *mctx, dns_ipkeylist_t *ipkl)
{
    isc_uint32_t addrcount = 0, dscpcount = 0, keycount = 0, i = 0;
    isc_uint32_t listcount = 0, l = 0, j;
    isc_uint32_t stackcount = 0, pushed = 0;
    isc_result_t result;
    const cfg_listelt_t *element;
    const cfg_obj_t *addrlist;
    const cfg_obj_t *portobj;
    const cfg_obj_t *dscpobj;
    in_port_t port;
    isc_dscp_t dscp = -1;
    dns_fixedname_t fname;
    isc_sockaddr_t *addrs = NULL;
    isc_dscp_t *dscps = NULL;
    dns_name_t **keys = NULL;
    struct { const char *name; } *lists = NULL;
    struct {
        const cfg_listelt_t *element;
        in_port_t port;
        isc_dscp_t dscp;
    } *stack = NULL;

    REQUIRE(ipkl != NULL);
    REQUIRE(ipkl->count == 0);
    REQUIRE(ipkl->addrs == NULL);
    REQUIRE(ipkl->keys == NULL);
    REQUIRE(ipkl->dscps == NULL);
    REQUIRE(ipkl->labels == NULL);
    REQUIRE(ipkl->allocated == 0);

    /*
     * Get system defaults.
     */
    result = ns_config_getport(config, &port);
    if (result != ISC_R_SUCCESS)
        goto cleanup;

    result = ns_config_getdscp(config, &dscp);
    if (result != ISC_R_SUCCESS)
        goto cleanup;

 newlist:
    addrlist = cfg_tuple_get(list, "addresses");
    portobj = cfg_tuple_get(list, "port");
    dscpobj = cfg_tuple_get(list, "dscp");

    if (cfg_obj_isuint32(portobj)) {
        isc_uint32_t val = cfg_obj_asuint32(portobj);
        if (val > ISC_UINT16_MAX) {
            cfg_obj_log(portobj, ns_g_lctx, ISC_LOG_ERROR,
                    "port '%u' out of range", val);
            result = ISC_R_RANGE;
            goto cleanup;
        }
        port = (in_port_t) val;
    }

    if (dscpobj != NULL && cfg_obj_isuint32(dscpobj)) {
        if (cfg_obj_asuint32(dscpobj) > 63) {
            cfg_obj_log(dscpobj, ns_g_lctx, ISC_LOG_ERROR,
                    "dscp value '%u' is out of range",
                    cfg_obj_asuint32(dscpobj));
            result = ISC_R_RANGE;
            goto cleanup;
        }
        dscp = (isc_dscp_t)cfg_obj_asuint32(dscpobj);
    }

    result = ISC_R_NOMEMORY;

    element = cfg_list_first(addrlist);
 resume:
    for ( ;
         element != NULL;
         element = cfg_list_next(element))
    {
        const cfg_obj_t *addr;
        const cfg_obj_t *key;
        const char *keystr;
        isc_buffer_t b;

        addr = cfg_tuple_get(cfg_listelt_value(element),
                     "masterselement");
        key = cfg_tuple_get(cfg_listelt_value(element), "key");

        if (!cfg_obj_issockaddr(addr)) {
            const char *listname = cfg_obj_asstring(addr);
            isc_result_t tresult;

            /* Grow lists? */
            if (listcount == l) {
                void * new;
                isc_uint32_t newlen = listcount + 16;
                size_t newsize, oldsize;

                newsize = newlen * sizeof(*lists);
                oldsize = listcount * sizeof(*lists);
                new = isc_mem_get(mctx, newsize);
                if (new == NULL)
                    goto cleanup;
                if (listcount != 0) {
                    memmove(new, lists, oldsize);
                    isc_mem_put(mctx, lists, oldsize);
                }
                lists = new;
                listcount = newlen;
            }
            /* Seen? */
            for (j = 0; j < l; j++)
                if (strcasecmp(lists[j].name, listname) == 0)
                    break;
            if (j < l)
                continue;
            tresult = get_masters_def(config, listname, &list);
            if (tresult == ISC_R_NOTFOUND) {
                cfg_obj_log(addr, ns_g_lctx, ISC_LOG_ERROR,
                    "masters \"%s\" not found", listname);

                result = tresult;
                goto cleanup;
            }
            if (tresult != ISC_R_SUCCESS)
                goto cleanup;
            lists[l++].name = listname;
            /* Grow stack? */
            if (stackcount == pushed) {
                void * new;
                isc_uint32_t newlen = stackcount + 16;
                size_t newsize, oldsize;

                newsize = newlen * sizeof(*stack);
                oldsize = stackcount * sizeof(*stack);
                new = isc_mem_get(mctx, newsize);
                if (new == NULL)
                    goto cleanup;
                if (stackcount != 0) {
                    memmove(new, stack, oldsize);
                    isc_mem_put(mctx, stack, oldsize);
                }
                stack = new;
                stackcount = newlen;
            }
            /*
             * We want to resume processing this list on the
             * next element.
             */
            stack[pushed].element = cfg_list_next(element);
            stack[pushed].port = port;
            stack[pushed].dscp = dscp;
            pushed++;
            goto newlist;
        }

        if (i == addrcount) {
            void * new;
            isc_uint32_t newlen = addrcount + 16;
            size_t newsize, oldsize;

            newsize = newlen * sizeof(isc_sockaddr_t);
            oldsize = addrcount * sizeof(isc_sockaddr_t);
            new = isc_mem_get(mctx, newsize);
            if (new == NULL)
                goto cleanup;
            if (addrcount != 0) {
                memmove(new, addrs, oldsize);
                isc_mem_put(mctx, addrs, oldsize);
            }
            addrs = new;
            addrcount = newlen;

            newsize = newlen * sizeof(isc_dscp_t);
            oldsize = dscpcount * sizeof(isc_dscp_t);
            new = isc_mem_get(mctx, newsize);
            if (new == NULL)
                goto cleanup;
            if (dscpcount != 0) {
                memmove(new, dscps, oldsize);
                isc_mem_put(mctx, dscps, oldsize);
            }
            dscps = new;
            dscpcount = newlen;

            newsize = newlen * sizeof(dns_name_t *);
            oldsize = keycount * sizeof(dns_name_t *);
            new = isc_mem_get(mctx, newsize);
            if (new == NULL)
                goto cleanup;
            if (keycount != 0) {
                memmove(new, keys, oldsize);
                isc_mem_put(mctx, keys, oldsize);
            }
            keys = new;
            keycount = newlen;
        }

        addrs[i] = *cfg_obj_assockaddr(addr);
        if (isc_sockaddr_getport(&addrs[i]) == 0)
            isc_sockaddr_setport(&addrs[i], port);
        dscps[i] = cfg_obj_getdscp(addr);
        if (dscps[i] == -1)
            dscps[i] = dscp;
        keys[i] = NULL;
        i++;    /* Increment here so that cleanup on error works. */
        if (!cfg_obj_isstring(key))
            continue;
        keys[i - 1] = isc_mem_get(mctx, sizeof(dns_name_t));
        if (keys[i - 1] == NULL)
            goto cleanup;
        dns_name_init(keys[i - 1], NULL);

        keystr = cfg_obj_asstring(key);
        isc_buffer_constinit(&b, keystr, strlen(keystr));
        isc_buffer_add(&b, strlen(keystr));
        dns_fixedname_init(&fname);
        result = dns_name_fromtext(dns_fixedname_name(&fname), &b,
                       dns_rootname, 0, NULL);
        if (result != ISC_R_SUCCESS)
            goto cleanup;
        result = dns_name_dup(dns_fixedname_name(&fname), mctx,
                      keys[i - 1]);
        if (result != ISC_R_SUCCESS)
            goto cleanup;
    }
    if (pushed != 0) {
        pushed--;
        element = stack[pushed].element;
        port = stack[pushed].port;
        dscp = stack[pushed].dscp;
        goto resume;
    }
    if (i < addrcount) {
        void * new;
        size_t newsize, oldsize;

        newsize = i * sizeof(isc_sockaddr_t);
        oldsize = addrcount * sizeof(isc_sockaddr_t);
        if (i != 0) {
            new = isc_mem_get(mctx, newsize);
            if (new == NULL)
                goto cleanup;
            memmove(new, addrs, newsize);
        } else
            new = NULL;
        isc_mem_put(mctx, addrs, oldsize);
        addrs = new;
        addrcount = i;

        newsize = i * sizeof(isc_dscp_t);
        oldsize = dscpcount * sizeof(isc_dscp_t);
        if (i != 0) {
            new = isc_mem_get(mctx, newsize);
            if (new == NULL)
                goto cleanup;
            memmove(new, dscps, newsize);
        } else
            new = NULL;
        isc_mem_put(mctx, dscps, oldsize);
        dscps = new;
        dscpcount = i;

        newsize = i * sizeof(dns_name_t *);
        oldsize = keycount * sizeof(dns_name_t *);
        if (i != 0) {
            new = isc_mem_get(mctx, newsize);
            if (new == NULL)
                goto cleanup;
            memmove(new, keys,  newsize);
        } else
            new = NULL;
        isc_mem_put(mctx, keys, oldsize);
        keys = new;
        keycount = i;
    }

    if (lists != NULL)
        isc_mem_put(mctx, lists, listcount * sizeof(*lists));
    if (stack != NULL)
        isc_mem_put(mctx, stack, stackcount * sizeof(*stack));

    INSIST(keycount == addrcount);

    ipkl->addrs = addrs;
    ipkl->dscps = dscps;
    ipkl->keys = keys;
    ipkl->count = addrcount;
    ipkl->allocated = addrcount;

    return (ISC_R_SUCCESS);

 cleanup:
    if (addrs != NULL)
        isc_mem_put(mctx, addrs, addrcount * sizeof(isc_sockaddr_t));
    if (dscps != NULL)
        isc_mem_put(mctx, dscps, dscpcount * sizeof(isc_dscp_t));
    if (keys != NULL) {
        for (j = 0; j < i; j++) {
            if (keys[j] == NULL)
                continue;
            if (dns_name_dynamic(keys[j]))
                dns_name_free(keys[j], mctx);
            isc_mem_put(mctx, keys[j], sizeof(dns_name_t));
        }
        isc_mem_put(mctx, keys, keycount * sizeof(dns_name_t *));
    }
    if (lists != NULL)
        isc_mem_put(mctx, lists, listcount * sizeof(*lists));
    if (stack != NULL)
        isc_mem_put(mctx, stack, stackcount * sizeof(*stack));
    return (result);
}

isc_result_t
ns_config_getport(const cfg_obj_t *config, in_port_t *portp) {
    const cfg_obj_t *maps[3];
    const cfg_obj_t *options = NULL;
    const cfg_obj_t *portobj = NULL;
    isc_result_t result;
    int i;

    (void)cfg_map_get(config, "options", &options);
    i = 0;
    if (options != NULL)
        maps[i++] = options;
    maps[i++] = ns_g_defaults;
    maps[i] = NULL;

    result = ns_config_get(maps, "port", &portobj);
    INSIST(result == ISC_R_SUCCESS);
    if (cfg_obj_asuint32(portobj) >= ISC_UINT16_MAX) {
        cfg_obj_log(portobj, ns_g_lctx, ISC_LOG_ERROR,
                "port '%u' out of range",
                cfg_obj_asuint32(portobj));
        return (ISC_R_RANGE);
    }
    *portp = (in_port_t)cfg_obj_asuint32(portobj);
    return (ISC_R_SUCCESS);
}

isc_result_t
ns_config_getdscp(const cfg_obj_t *config, isc_dscp_t *dscpp) {
    const cfg_obj_t *options = NULL;
    const cfg_obj_t *dscpobj = NULL;
    isc_result_t result;

    (void)cfg_map_get(config, "options", &options);
    if (options == NULL)
        return (ISC_R_SUCCESS);

    result = cfg_map_get(options, "dscp", &dscpobj);
    if (result != ISC_R_SUCCESS || dscpobj == NULL) {
        *dscpp = -1;
        return (ISC_R_SUCCESS);
    }
    if (cfg_obj_asuint32(dscpobj) >= 64) {
        cfg_obj_log(dscpobj, ns_g_lctx, ISC_LOG_ERROR,
                "dscp '%u' out of range",
                cfg_obj_asuint32(dscpobj));
        return (ISC_R_RANGE);
    }
    *dscpp = (isc_dscp_t)cfg_obj_asuint32(dscpobj);
    return (ISC_R_SUCCESS);
}

struct keyalgorithms {
    const char *str;
    enum { hmacnone, hmacmd5, hmacsha1, hmacsha224,
           hmacsha256, hmacsha384, hmacsha512 } hmac;
    unsigned int type;
    isc_uint16_t size;
} algorithms[] = {
    { "hmac-md5", hmacmd5, DST_ALG_HMACMD5, 128 },
    { "hmac-md5.sig-alg.reg.int", hmacmd5, DST_ALG_HMACMD5, 0 },
    { "hmac-md5.sig-alg.reg.int.", hmacmd5, DST_ALG_HMACMD5, 0 },
    { "hmac-sha1", hmacsha1, DST_ALG_HMACSHA1, 160 },
    { "hmac-sha224", hmacsha224, DST_ALG_HMACSHA224, 224 },
    { "hmac-sha256", hmacsha256, DST_ALG_HMACSHA256, 256 },
    { "hmac-sha384", hmacsha384, DST_ALG_HMACSHA384, 384 },
    { "hmac-sha512", hmacsha512, DST_ALG_HMACSHA512, 512 },
    {  NULL, hmacnone, DST_ALG_UNKNOWN, 0 }
};

isc_result_t
ns_config_getkeyalgorithm(const char *str, dns_name_t **name,
              isc_uint16_t *digestbits)
{
    return (ns_config_getkeyalgorithm2(str, name, NULL, digestbits));
}

isc_result_t
ns_config_getkeyalgorithm2(const char *str, dns_name_t **name,
               unsigned int *typep, isc_uint16_t *digestbits)
{
    int i;
    size_t len = 0;
    isc_uint16_t bits;
    isc_result_t result;

    for (i = 0; algorithms[i].str != NULL; i++) {
        len = strlen(algorithms[i].str);
        if (strncasecmp(algorithms[i].str, str, len) == 0 &&
            (str[len] == '\0' ||
             (algorithms[i].size != 0 && str[len] == '-')))
            break;
    }
    if (algorithms[i].str == NULL)
        return (ISC_R_NOTFOUND);
    if (str[len] == '-') {
        result = isc_parse_uint16(&bits, str + len + 1, 10);
        if (result != ISC_R_SUCCESS)
            return (result);
        if (bits > algorithms[i].size)
            return (ISC_R_RANGE);
    } else if (algorithms[i].size == 0)
        bits = 128;
    else
        bits = algorithms[i].size;

    if (name != NULL) {
        switch (algorithms[i].hmac) {
        case hmacmd5: *name = dns_tsig_hmacmd5_name; break;
        case hmacsha1: *name = dns_tsig_hmacsha1_name; break;
        case hmacsha224: *name = dns_tsig_hmacsha224_name; break;
        case hmacsha256: *name = dns_tsig_hmacsha256_name; break;
        case hmacsha384: *name = dns_tsig_hmacsha384_name; break;
        case hmacsha512: *name = dns_tsig_hmacsha512_name; break;
        default:
            INSIST(0);
        }
    }
    if (typep != NULL)
        *typep = algorithms[i].type;
    if (digestbits != NULL)
        *digestbits = bits;
    return (ISC_R_SUCCESS);
}