naptr_35.c

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/*
 * Copyright (C) 2004, 2005, 2007-2009, 2011-2014  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2001, 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.
 */

/* $Id$ */

/* Reviewed: Thu Mar 16 16:52:50 PST 2000 by bwelling */

/* RFC2915 */

#ifndef RDATA_GENERIC_NAPTR_35_C
#define RDATA_GENERIC_NAPTR_35_C

#define RRTYPE_NAPTR_ATTRIBUTES (0)

#include <isc/regex.h>

/*
 * Check the wire format of the Regexp field.
 * Don't allow embeded NUL's.
 */
static inline isc_result_t
txt_valid_regex(const unsigned char *txt) {
        unsigned int nsub = 0;
        char regex[256];
        char *cp;
        isc_boolean_t flags = ISC_FALSE;
        isc_boolean_t replace = ISC_FALSE;
        unsigned char c;
        unsigned char delim;
        unsigned int len;
        int n;

        len = *txt++;
        if (len == 0U)
                return (ISC_R_SUCCESS);

        delim = *txt++;
        len--;

        /*
         * Digits, backslash and flags can't be delimiters.
         */
        switch (delim) {
        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
        case '\\': case 'i': case 0:
                return (DNS_R_SYNTAX);
        }

        cp = regex;
        while (len-- > 0) {
                c = *txt++;
                if (c == 0)
                        return (DNS_R_SYNTAX);
                if (c == delim && !replace) {
                        replace = ISC_TRUE;
                        continue;
                } else if (c == delim && !flags) {
                        flags = ISC_TRUE;
                        continue;
                } else if (c == delim)
                        return (DNS_R_SYNTAX);
                /*
                 * Flags are not escaped.
                 */
                if (flags) {
                        switch (c) {
                        case 'i':
                                continue;
                        default:
                                return (DNS_R_SYNTAX);
                        }
                }
                if (!replace)
                        *cp++ = c;
                if (c == '\\') {
                        if (len == 0)
                                return (DNS_R_SYNTAX);
                        c = *txt++;
                        if (c == 0)
                                return (DNS_R_SYNTAX);
                        len--;
                        if (replace)
                                switch (c) {
                                case '0': return (DNS_R_SYNTAX);
                                case '1': if (nsub < 1) nsub = 1; break;
                                case '2': if (nsub < 2) nsub = 2; break;
                                case '3': if (nsub < 3) nsub = 3; break;
                                case '4': if (nsub < 4) nsub = 4; break;
                                case '5': if (nsub < 5) nsub = 5; break;
                                case '6': if (nsub < 6) nsub = 6; break;
                                case '7': if (nsub < 7) nsub = 7; break;
                                case '8': if (nsub < 8) nsub = 8; break;
                                case '9': if (nsub < 9) nsub = 9; break;
                                }
                        if (!replace)
                                *cp++ = c;
                }
        }
        if (!flags)
                return (DNS_R_SYNTAX);
        *cp = '\0';
        n = isc_regex_validate(regex);
        if (n < 0 || nsub > (unsigned int)n)
                return (DNS_R_SYNTAX);
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromtext_naptr(ARGS_FROMTEXT) {
        isc_token_t token;
        dns_name_t name;
        isc_buffer_t buffer;
        unsigned char *regex;

        REQUIRE(type == 35);

        UNUSED(type);
        UNUSED(rdclass);
        UNUSED(callbacks);

        /*
         * Order.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
                                      ISC_FALSE));
        if (token.value.as_ulong > 0xffffU)
                RETTOK(ISC_R_RANGE);
        RETERR(uint16_tobuffer(token.value.as_ulong, target));

        /*
         * Preference.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
                                      ISC_FALSE));
        if (token.value.as_ulong > 0xffffU)
                RETTOK(ISC_R_RANGE);
        RETERR(uint16_tobuffer(token.value.as_ulong, target));

        /*
         * Flags.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
                                      ISC_FALSE));
        RETTOK(txt_fromtext(&token.value.as_textregion, target));

        /*
         * Service.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
                                      ISC_FALSE));
        RETTOK(txt_fromtext(&token.value.as_textregion, target));

        /*
         * Regexp.
         */
        regex = isc_buffer_used(target);
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
                                      ISC_FALSE));
        RETTOK(txt_fromtext(&token.value.as_textregion, target));
        RETTOK(txt_valid_regex(regex));

        /*
         * Replacement.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                                      ISC_FALSE));
        dns_name_init(&name, NULL);
        buffer_fromregion(&buffer, &token.value.as_region);
        origin = (origin != NULL) ? origin : dns_rootname;
        RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
totext_naptr(ARGS_TOTEXT) {
        isc_region_t region;
        dns_name_t name;
        dns_name_t prefix;
        isc_boolean_t sub;
        char buf[sizeof("64000")];
        unsigned short num;

        REQUIRE(rdata->type == 35);
        REQUIRE(rdata->length != 0);

        dns_name_init(&name, NULL);
        dns_name_init(&prefix, NULL);

        dns_rdata_toregion(rdata, &region);

        /*
         * Order.
         */
        num = uint16_fromregion(&region);
        isc_region_consume(&region, 2);
        sprintf(buf, "%u", num);
        RETERR(str_totext(buf, target));
        RETERR(str_totext(" ", target));

        /*
         * Preference.
         */
        num = uint16_fromregion(&region);
        isc_region_consume(&region, 2);
        sprintf(buf, "%u", num);
        RETERR(str_totext(buf, target));
        RETERR(str_totext(" ", target));

        /*
         * Flags.
         */
        RETERR(txt_totext(&region, ISC_TRUE, target));
        RETERR(str_totext(" ", target));

        /*
         * Service.
         */
        RETERR(txt_totext(&region, ISC_TRUE, target));
        RETERR(str_totext(" ", target));

        /*
         * Regexp.
         */
        RETERR(txt_totext(&region, ISC_TRUE, target));
        RETERR(str_totext(" ", target));

        /*
         * Replacement.
         */
        dns_name_fromregion(&name, &region);
        sub = name_prefix(&name, tctx->origin, &prefix);
        return (dns_name_totext(&prefix, sub, target));
}

static inline isc_result_t
fromwire_naptr(ARGS_FROMWIRE) {
        dns_name_t name;
        isc_region_t sr;
        unsigned char *regex;

        REQUIRE(type == 35);

        UNUSED(type);
        UNUSED(rdclass);

        dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);

        dns_name_init(&name, NULL);

        /*
         * Order, preference.
         */
        isc_buffer_activeregion(source, &sr);
        if (sr.length < 4)
                return (ISC_R_UNEXPECTEDEND);
        RETERR(mem_tobuffer(target, sr.base, 4));
        isc_buffer_forward(source, 4);

        /*
         * Flags.
         */
        RETERR(txt_fromwire(source, target));

        /*
         * Service.
         */
        RETERR(txt_fromwire(source, target));

        /*
         * Regexp.
         */
        regex = isc_buffer_used(target);
        RETERR(txt_fromwire(source, target));
        RETERR(txt_valid_regex(regex));

        /*
         * Replacement.
         */
        return (dns_name_fromwire(&name, source, dctx, options, target));
}

static inline isc_result_t
towire_naptr(ARGS_TOWIRE) {
        dns_name_t name;
        dns_offsets_t offsets;
        isc_region_t sr;

        REQUIRE(rdata->type == 35);
        REQUIRE(rdata->length != 0);

        dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
        /*
         * Order, preference.
         */
        dns_rdata_toregion(rdata, &sr);
        RETERR(mem_tobuffer(target, sr.base, 4));
        isc_region_consume(&sr, 4);

        /*
         * Flags.
         */
        RETERR(mem_tobuffer(target, sr.base, sr.base[0] + 1));
        isc_region_consume(&sr, sr.base[0] + 1);

        /*
         * Service.
         */
        RETERR(mem_tobuffer(target, sr.base, sr.base[0] + 1));
        isc_region_consume(&sr, sr.base[0] + 1);

        /*
         * Regexp.
         */
        RETERR(mem_tobuffer(target, sr.base, sr.base[0] + 1));
        isc_region_consume(&sr, sr.base[0] + 1);

        /*
         * Replacement.
         */
        dns_name_init(&name, offsets);
        dns_name_fromregion(&name, &sr);
        return (dns_name_towire(&name, cctx, target));
}

static inline int
compare_naptr(ARGS_COMPARE) {
        dns_name_t name1;
        dns_name_t name2;
        isc_region_t region1;
        isc_region_t region2;
        int order, len;

        REQUIRE(rdata1->type == rdata2->type);
        REQUIRE(rdata1->rdclass == rdata2->rdclass);
        REQUIRE(rdata1->type == 35);
        REQUIRE(rdata1->length != 0);
        REQUIRE(rdata2->length != 0);

        dns_rdata_toregion(rdata1, &region1);
        dns_rdata_toregion(rdata2, &region2);

        /*
         * Order, preference.
         */
        order = memcmp(region1.base, region2.base, 4);
        if (order != 0)
                return (order < 0 ? -1 : 1);
        isc_region_consume(&region1, 4);
        isc_region_consume(&region2, 4);

        /*
         * Flags.
         */
        len = ISC_MIN(region1.base[0], region2.base[0]);
        order = memcmp(region1.base, region2.base, len + 1);
        if (order != 0)
                return (order < 0 ? -1 : 1);
        isc_region_consume(&region1, region1.base[0] + 1);
        isc_region_consume(&region2, region2.base[0] + 1);

        /*
         * Service.
         */
        len = ISC_MIN(region1.base[0], region2.base[0]);
        order = memcmp(region1.base, region2.base, len + 1);
        if (order != 0)
                return (order < 0 ? -1 : 1);
        isc_region_consume(&region1, region1.base[0] + 1);
        isc_region_consume(&region2, region2.base[0] + 1);

        /*
         * Regexp.
         */
        len = ISC_MIN(region1.base[0], region2.base[0]);
        order = memcmp(region1.base, region2.base, len + 1);
        if (order != 0)
                return (order < 0 ? -1 : 1);
        isc_region_consume(&region1, region1.base[0] + 1);
        isc_region_consume(&region2, region2.base[0] + 1);

        /*
         * Replacement.
         */
        dns_name_init(&name1, NULL);
        dns_name_init(&name2, NULL);

        dns_name_fromregion(&name1, &region1);
        dns_name_fromregion(&name2, &region2);

        return (dns_name_rdatacompare(&name1, &name2));
}

static inline isc_result_t
fromstruct_naptr(ARGS_FROMSTRUCT) {
        dns_rdata_naptr_t *naptr = source;
        isc_region_t region;

        REQUIRE(type == 35);
        REQUIRE(source != NULL);
        REQUIRE(naptr->common.rdtype == type);
        REQUIRE(naptr->common.rdclass == rdclass);
        REQUIRE(naptr->flags != NULL || naptr->flags_len == 0);
        REQUIRE(naptr->service != NULL || naptr->service_len == 0);
        REQUIRE(naptr->regexp != NULL || naptr->regexp_len == 0);

        UNUSED(type);
        UNUSED(rdclass);

        RETERR(uint16_tobuffer(naptr->order, target));
        RETERR(uint16_tobuffer(naptr->preference, target));
        RETERR(uint8_tobuffer(naptr->flags_len, target));
        RETERR(mem_tobuffer(target, naptr->flags, naptr->flags_len));
        RETERR(uint8_tobuffer(naptr->service_len, target));
        RETERR(mem_tobuffer(target, naptr->service, naptr->service_len));
        RETERR(uint8_tobuffer(naptr->regexp_len, target));
        RETERR(mem_tobuffer(target, naptr->regexp, naptr->regexp_len));
        dns_name_toregion(&naptr->replacement, &region);
        return (isc_buffer_copyregion(target, &region));
}

static inline isc_result_t
tostruct_naptr(ARGS_TOSTRUCT) {
        dns_rdata_naptr_t *naptr = target;
        isc_region_t r;
        isc_result_t result;
        dns_name_t name;

        REQUIRE(rdata->type == 35);
        REQUIRE(target != NULL);
        REQUIRE(rdata->length != 0);

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

        naptr->flags = NULL;
        naptr->service = NULL;
        naptr->regexp = NULL;

        dns_rdata_toregion(rdata, &r);

        naptr->order = uint16_fromregion(&r);
        isc_region_consume(&r, 2);

        naptr->preference = uint16_fromregion(&r);
        isc_region_consume(&r, 2);

        naptr->flags_len = uint8_fromregion(&r);
        isc_region_consume(&r, 1);
        INSIST(naptr->flags_len <= r.length);
        naptr->flags = mem_maybedup(mctx, r.base, naptr->flags_len);
        if (naptr->flags == NULL)
                goto cleanup;
        isc_region_consume(&r, naptr->flags_len);

        naptr->service_len = uint8_fromregion(&r);
        isc_region_consume(&r, 1);
        INSIST(naptr->service_len <= r.length);
        naptr->service = mem_maybedup(mctx, r.base, naptr->service_len);
        if (naptr->service == NULL)
                goto cleanup;
        isc_region_consume(&r, naptr->service_len);

        naptr->regexp_len = uint8_fromregion(&r);
        isc_region_consume(&r, 1);
        INSIST(naptr->regexp_len <= r.length);
        naptr->regexp = mem_maybedup(mctx, r.base, naptr->regexp_len);
        if (naptr->regexp == NULL)
                goto cleanup;
        isc_region_consume(&r, naptr->regexp_len);

        dns_name_init(&name, NULL);
        dns_name_fromregion(&name, &r);
        dns_name_init(&naptr->replacement, NULL);
        result = name_duporclone(&name, mctx, &naptr->replacement);
        if (result != ISC_R_SUCCESS)
                goto cleanup;
        naptr->mctx = mctx;
        return (ISC_R_SUCCESS);

 cleanup:
        if (mctx != NULL && naptr->flags != NULL)
                isc_mem_free(mctx, naptr->flags);
        if (mctx != NULL && naptr->service != NULL)
                isc_mem_free(mctx, naptr->service);
        if (mctx != NULL && naptr->regexp != NULL)
                isc_mem_free(mctx, naptr->regexp);
        return (ISC_R_NOMEMORY);
}

static inline void
freestruct_naptr(ARGS_FREESTRUCT) {
        dns_rdata_naptr_t *naptr = source;

        REQUIRE(source != NULL);
        REQUIRE(naptr->common.rdtype == 35);

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

        if (naptr->flags != NULL)
                isc_mem_free(naptr->mctx, naptr->flags);
        if (naptr->service != NULL)
                isc_mem_free(naptr->mctx, naptr->service);
        if (naptr->regexp != NULL)
                isc_mem_free(naptr->mctx, naptr->regexp);
        dns_name_free(&naptr->replacement, naptr->mctx);
        naptr->mctx = NULL;
}

static inline isc_result_t
additionaldata_naptr(ARGS_ADDLDATA) {
        dns_name_t name;
        dns_offsets_t offsets;
        isc_region_t sr;
        dns_rdatatype_t atype;
        unsigned int i, flagslen;
        char *cp;

        REQUIRE(rdata->type == 35);

        /*
         * Order, preference.
         */
        dns_rdata_toregion(rdata, &sr);
        isc_region_consume(&sr, 4);

        /*
         * Flags.
         */
        atype = 0;
        flagslen = sr.base[0];
        cp = (char *)&sr.base[1];
        for (i = 0; i < flagslen; i++, cp++) {
                if (*cp == 'S' || *cp == 's') {
                        atype = dns_rdatatype_srv;
                        break;
                }
                if (*cp == 'A' || *cp == 'a') {
                        atype = dns_rdatatype_a;
                        break;
                }
        }
        isc_region_consume(&sr, flagslen + 1);

        /*
         * Service.
         */
        isc_region_consume(&sr, sr.base[0] + 1);

        /*
         * Regexp.
         */
        isc_region_consume(&sr, sr.base[0] + 1);

        /*
         * Replacement.
         */
        dns_name_init(&name, offsets);
        dns_name_fromregion(&name, &sr);

        if (atype != 0)
                return ((add)(arg, &name, atype));

        return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_naptr(ARGS_DIGEST) {
        isc_region_t r1, r2;
        unsigned int length, n;
        isc_result_t result;
        dns_name_t name;

        REQUIRE(rdata->type == 35);

        dns_rdata_toregion(rdata, &r1);
        r2 = r1;
        length = 0;

        /*
         * Order, preference.
         */
        length += 4;
        isc_region_consume(&r2, 4);

        /*
         * Flags.
         */
        n = r2.base[0] + 1;
        length += n;
        isc_region_consume(&r2, n);

        /*
         * Service.
         */
        n = r2.base[0] + 1;
        length += n;
        isc_region_consume(&r2, n);

        /*
         * Regexp.
         */
        n = r2.base[0] + 1;
        length += n;
        isc_region_consume(&r2, n);

        /*
         * Digest the RR up to the replacement name.
         */
        r1.length = length;
        result = (digest)(arg, &r1);
        if (result != ISC_R_SUCCESS)
                return (result);

        /*
         * Replacement.
         */

        dns_name_init(&name, NULL);
        dns_name_fromregion(&name, &r2);

        return (dns_name_digest(&name, digest, arg));
}

static inline isc_boolean_t
checkowner_naptr(ARGS_CHECKOWNER) {

        REQUIRE(type == 35);

        UNUSED(name);
        UNUSED(type);
        UNUSED(rdclass);
        UNUSED(wildcard);

        return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_naptr(ARGS_CHECKNAMES) {

        REQUIRE(rdata->type == 35);

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

        return (ISC_TRUE);
}

static inline int
casecompare_naptr(ARGS_COMPARE) {
        return (compare_naptr(rdata1, rdata2));
}

#endif  /* RDATA_GENERIC_NAPTR_35_C */

---