rdata/in_1/wks_11.c

/*
 * Copyright (C) 1999-2002, 2004, 2007, 2009, 2011-2017  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/.
 */

/* $Id$ */

/* Reviewed: Fri Mar 17 15:01:49 PST 2000 by explorer */

#ifndef RDATA_IN_1_WKS_11_C
#define RDATA_IN_1_WKS_11_C

#include <limits.h>
#include <stdlib.h>

#include <isc/net.h>
#include <isc/netdb.h>
#include <isc/once.h>

#define RRTYPE_WKS_ATTRIBUTES (0)

static isc_mutex_t wks_lock;

static void init_lock(void) {
    RUNTIME_CHECK(isc_mutex_init(&wks_lock) == ISC_R_SUCCESS);
}

static isc_boolean_t
mygetprotobyname(const char *name, long *proto) {
    struct protoent *pe;

    LOCK(&wks_lock);
    pe = getprotobyname(name);
    if (pe != NULL)
        *proto = pe->p_proto;
    UNLOCK(&wks_lock);
    return (ISC_TF(pe != NULL));
}

static isc_boolean_t
mygetservbyname(const char *name, const char *proto, long *port) {
    struct servent *se;

    LOCK(&wks_lock);
    se = getservbyname(name, proto);
    if (se != NULL)
        *port = ntohs(se->s_port);
    UNLOCK(&wks_lock);
    return (ISC_TF(se != NULL));
}

#ifdef _WIN32
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#endif

static inline isc_result_t
fromtext_in_wks(ARGS_FROMTEXT) {
    static isc_once_t once = ISC_ONCE_INIT;
    isc_token_t token;
    isc_region_t region;
    struct in_addr addr;
    char *e;
    long proto;
    unsigned char bm[8*1024]; /* 64k bits */
    long port;
    long maxport = -1;
    const char *ps = NULL;
    unsigned int n;
    char service[32];
    int i;
    isc_result_t result;

    REQUIRE(type == dns_rdatatype_wks);
    REQUIRE(rdclass == dns_rdataclass_in);

    UNUSED(type);
    UNUSED(origin);
    UNUSED(options);
    UNUSED(rdclass);

    RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS);

#ifdef _WIN32
    {
        WORD wVersionRequested;
        WSADATA wsaData;
        int err;

        wVersionRequested = MAKEWORD(2, 0);

        err = WSAStartup(wVersionRequested, &wsaData );
        if (err != 0)
            return (ISC_R_FAILURE);
    }
#endif

    /*
     * IPv4 dotted quad.
     */
    CHECK(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                      ISC_FALSE));

    isc_buffer_availableregion(target, &region);
    if (getquad(DNS_AS_STR(token), &addr, lexer, callbacks) != 1)
        CHECKTOK(DNS_R_BADDOTTEDQUAD);
    if (region.length < 4)
        return (ISC_R_NOSPACE);
    memmove(region.base, &addr, 4);
    isc_buffer_add(target, 4);

    /*
     * Protocol.
     */
    CHECK(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                      ISC_FALSE));

    proto = strtol(DNS_AS_STR(token), &e, 10);
    if (*e == 0)
        ;
    else if (!mygetprotobyname(DNS_AS_STR(token), &proto))
        CHECKTOK(DNS_R_UNKNOWNPROTO);

    if (proto < 0 || proto > 0xff)
        CHECKTOK(ISC_R_RANGE);

    if (proto == IPPROTO_TCP)
        ps = "tcp";
    else if (proto == IPPROTO_UDP)
        ps = "udp";

    CHECK(uint8_tobuffer(proto, target));

    memset(bm, 0, sizeof(bm));
    do {
        CHECK(isc_lex_getmastertoken(lexer, &token,
                          isc_tokentype_string, ISC_TRUE));
        if (token.type != isc_tokentype_string)
            break;

        /*
         * Lowercase the service string as some getservbyname() are
         * case sensitive and the database is usually in lowercase.
         */
        strncpy(service, DNS_AS_STR(token), sizeof(service));
        service[sizeof(service)-1] = '\0';
        for (i = strlen(service) - 1; i >= 0; i--)
            if (isupper(service[i]&0xff))
                service[i] = tolower(service[i]&0xff);

        port = strtol(DNS_AS_STR(token), &e, 10);
        if (*e == 0)
            ;
        else if (!mygetservbyname(service, ps, &port) &&
             !mygetservbyname(DNS_AS_STR(token), ps, &port))
            CHECKTOK(DNS_R_UNKNOWNSERVICE);
        if (port < 0 || port > 0xffff)
            CHECKTOK(ISC_R_RANGE);
        if (port > maxport)
            maxport = port;
        bm[port / 8] |= (0x80 >> (port % 8));
    } while (1);

    /*
     * Let upper layer handle eol/eof.
     */
    isc_lex_ungettoken(lexer, &token);

    n = (maxport + 8) / 8;
    result = mem_tobuffer(target, bm, n);

 cleanup:
#ifdef _WIN32
    WSACleanup();
#endif

    return (result);
}

static inline isc_result_t
totext_in_wks(ARGS_TOTEXT) {
    isc_region_t sr;
    unsigned short proto;
    char buf[sizeof("65535")];
    unsigned int i, j;

    UNUSED(tctx);

    REQUIRE(rdata->type == dns_rdatatype_wks);
    REQUIRE(rdata->rdclass == dns_rdataclass_in);
    REQUIRE(rdata->length >= 5);

    dns_rdata_toregion(rdata, &sr);
    RETERR(inet_totext(AF_INET, &sr, target));
    isc_region_consume(&sr, 4);

    proto = uint8_fromregion(&sr);
    snprintf(buf, sizeof(buf), "%u", proto);
    RETERR(str_totext(" ", target));
    RETERR(str_totext(buf, target));
    isc_region_consume(&sr, 1);

    INSIST(sr.length <= 8*1024);
    for (i = 0; i < sr.length; i++) {
        if (sr.base[i] != 0)
            for (j = 0; j < 8; j++)
                if ((sr.base[i] & (0x80 >> j)) != 0) {
                    snprintf(buf, sizeof(buf),
                         "%u", i * 8 + j);
                    RETERR(str_totext(" ", target));
                    RETERR(str_totext(buf, target));
                }
    }

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_in_wks(ARGS_FROMWIRE) {
    isc_region_t sr;
    isc_region_t tr;

    REQUIRE(type == dns_rdatatype_wks);
    REQUIRE(rdclass == dns_rdataclass_in);

    UNUSED(type);
    UNUSED(dctx);
    UNUSED(options);
    UNUSED(rdclass);

    isc_buffer_activeregion(source, &sr);
    isc_buffer_availableregion(target, &tr);

    if (sr.length < 5)
        return (ISC_R_UNEXPECTEDEND);
    if (sr.length > 8 * 1024 + 5)
        return (DNS_R_EXTRADATA);
    if (tr.length < sr.length)
        return (ISC_R_NOSPACE);

    memmove(tr.base, sr.base, sr.length);
    isc_buffer_add(target, sr.length);
    isc_buffer_forward(source, sr.length);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_in_wks(ARGS_TOWIRE) {
    isc_region_t sr;

    UNUSED(cctx);

    REQUIRE(rdata->type == dns_rdatatype_wks);
    REQUIRE(rdata->rdclass == dns_rdataclass_in);
    REQUIRE(rdata->length != 0);

    dns_rdata_toregion(rdata, &sr);
    return (mem_tobuffer(target, sr.base, sr.length));
}

static inline int
compare_in_wks(ARGS_COMPARE) {
    isc_region_t r1;
    isc_region_t r2;

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == dns_rdatatype_wks);
    REQUIRE(rdata1->rdclass == dns_rdataclass_in);
    REQUIRE(rdata1->length != 0);
    REQUIRE(rdata2->length != 0);

    dns_rdata_toregion(rdata1, &r1);
    dns_rdata_toregion(rdata2, &r2);
    return (isc_region_compare(&r1, &r2));
}

static inline isc_result_t
fromstruct_in_wks(ARGS_FROMSTRUCT) {
    dns_rdata_in_wks_t *wks = source;
    isc_uint32_t a;

    REQUIRE(type == dns_rdatatype_wks);
    REQUIRE(rdclass == dns_rdataclass_in);
    REQUIRE(source != NULL);
    REQUIRE(wks->common.rdtype == type);
    REQUIRE(wks->common.rdclass == rdclass);
    REQUIRE((wks->map != NULL && wks->map_len <= 8*1024) ||
         wks->map_len == 0);

    UNUSED(type);
    UNUSED(rdclass);

    a = ntohl(wks->in_addr.s_addr);
    RETERR(uint32_tobuffer(a, target));
    RETERR(uint8_tobuffer(wks->protocol, target));
    return (mem_tobuffer(target, wks->map, wks->map_len));
}

static inline isc_result_t
tostruct_in_wks(ARGS_TOSTRUCT) {
    dns_rdata_in_wks_t *wks = target;
    isc_uint32_t n;
    isc_region_t region;

    REQUIRE(rdata->type == dns_rdatatype_wks);
    REQUIRE(rdata->rdclass == dns_rdataclass_in);
    REQUIRE(rdata->length != 0);

    wks->common.rdclass = rdata->rdclass;
    wks->common.rdtype = rdata->type;
    ISC_LINK_INIT(&wks->common, link);

    dns_rdata_toregion(rdata, &region);
    n = uint32_fromregion(&region);
    wks->in_addr.s_addr = htonl(n);
    isc_region_consume(&region, 4);
    wks->protocol = uint8_fromregion(&region);
    isc_region_consume(&region, 1);
    wks->map_len = region.length;
    wks->map = mem_maybedup(mctx, region.base, region.length);
    if (wks->map == NULL)
        return (ISC_R_NOMEMORY);
    wks->mctx = mctx;
    return (ISC_R_SUCCESS);
}

static inline void
freestruct_in_wks(ARGS_FREESTRUCT) {
    dns_rdata_in_wks_t *wks = source;

    REQUIRE(source != NULL);
    REQUIRE(wks->common.rdtype == dns_rdatatype_wks);
    REQUIRE(wks->common.rdclass == dns_rdataclass_in);

    if (wks->mctx == NULL)
        return;

    if (wks->map != NULL)
        isc_mem_free(wks->mctx, wks->map);
    wks->mctx = NULL;
}

static inline isc_result_t
additionaldata_in_wks(ARGS_ADDLDATA) {
    UNUSED(rdata);
    UNUSED(add);
    UNUSED(arg);

    REQUIRE(rdata->type == dns_rdatatype_wks);
    REQUIRE(rdata->rdclass == dns_rdataclass_in);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_in_wks(ARGS_DIGEST) {
    isc_region_t r;

    REQUIRE(rdata->type == dns_rdatatype_wks);
    REQUIRE(rdata->rdclass == dns_rdataclass_in);

    dns_rdata_toregion(rdata, &r);

    return ((digest)(arg, &r));
}

static inline isc_boolean_t
checkowner_in_wks(ARGS_CHECKOWNER) {

    REQUIRE(type == dns_rdatatype_wks);
    REQUIRE(rdclass == dns_rdataclass_in);

    UNUSED(type);
    UNUSED(rdclass);

    return (dns_name_ishostname(name, wildcard));
}

static inline isc_boolean_t
checknames_in_wks(ARGS_CHECKNAMES) {

    REQUIRE(rdata->type == dns_rdatatype_wks);
    REQUIRE(rdata->rdclass == dns_rdataclass_in);

    UNUSED(rdata);
    UNUSED(owner);
    UNUSED(bad);

    return (ISC_TRUE);
}

static inline int
casecompare_in_wks(ARGS_COMPARE) {
    return (compare_in_wks(rdata1, rdata2));
}

#endif  /* RDATA_IN_1_WKS_11_C */