config.c

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/*
 * Copyright (C) 2004-2015  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 2001-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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.
 */

/*! \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"
#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 true;\n\
#       directory <none>\n\
        dump-file \"named_dump.db\";\n\
        fake-iquery no;\n\
        has-old-clients false;\n\
        heartbeat-interval 60;\n\
        host-statistics no;\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 no;\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 20;\n\
        serial-query-rate 20;\n\
        server-id none;\n\
        startup-notify-rate 20;\n\
        statistics-file \"named.stats\";\n\
        statistics-interval 60;\n\
        tcp-clients 150;\n\
        tcp-listen-queue 10;\n\
#       tkey-dhkey <none>\n\
#       tkey-gssapi-credential <none>\n\
#       tkey-domain <none>\n\
        transfers-per-ns 2;\n\
        transfers-in 10;\n\
        transfers-out 10;\n\
        treat-cr-as-space true;\n\
        use-id-pool true;\n\
        use-ixfr true;\n\
        edns-udp-size 4096;\n\
        max-udp-size 4096;\n\
"
#ifdef ISC_PLATFORM_USESIT
"\
        nosit-udp-size 4096;\n\
        request-sit true;\n\
"
#endif
"\
        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-responses false;\n\
        recursion true;\n\
        provide-ixfr true;\n\
        request-ixfr true;\n\
        request-expire true;\n\
        fetch-glue no;\n\
        rfc2308-type1 no;\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 2;\n\
        lame-ttl 600;\n\
        servfail-ttl 10;\n\
        max-ncache-ttl 10800; /* 3 hours */\n\
        max-cache-ttl 604800; /* 1 week */\n\
        transfer-format many-answers;\n\
        max-cache-size 0;\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\
        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\
"
#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 no;\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_buffer(parser, &b, &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, isc_sockaddr_t **addrsp,
                          isc_dscp_t **dscpsp, dns_name_t ***keysp,
                          isc_uint32_t *countp)
{
        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;
        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(addrsp != NULL && *addrsp == NULL);
        REQUIRE(dscpsp != NULL && *dscpsp == NULL);
        REQUIRE(keysp != NULL && *keysp == NULL);
        REQUIRE(countp != NULL);

        /*
         * 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);

        *addrsp = addrs;
        *dscpsp = dscps;
        *keysp = keys;
        *countp = 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);
}

void
ns_config_putipandkeylist(isc_mem_t *mctx, isc_sockaddr_t **addrsp,
                          isc_dscp_t **dscpsp, dns_name_t ***keysp,
                          isc_uint32_t count)
{
        unsigned int i;
        dns_name_t **keys;

        REQUIRE(addrsp != NULL && *addrsp != NULL);
        REQUIRE(dscpsp == NULL || *dscpsp != NULL);
        REQUIRE(keysp != NULL && *keysp != NULL);

        keys = *keysp;

        isc_mem_put(mctx, *addrsp, count * sizeof(isc_sockaddr_t));
        if (dscpsp != NULL)
                isc_mem_put(mctx, *dscpsp, count * sizeof(isc_dscp_t));
        for (i = 0; i < count; i++) {
                if (keys[i] == NULL)
                        continue;
                if (dns_name_dynamic(keys[i]))
                        dns_name_free(keys[i], mctx);
                isc_mem_put(mctx, keys[i], sizeof(dns_name_t));
        }
        isc_mem_put(mctx, *keysp, count * sizeof(dns_name_t *));
        *addrsp = NULL;
        if (dscpsp != NULL)
                *dscpsp = NULL;
        *keysp = NULL;
}

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);
}

---