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-rw-r--r--lib/dns/rcode.c585
1 files changed, 585 insertions, 0 deletions
diff --git a/lib/dns/rcode.c b/lib/dns/rcode.c
new file mode 100644
index 0000000..78897e9
--- /dev/null
+++ b/lib/dns/rcode.c
@@ -0,0 +1,585 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <ctype.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include <isc/buffer.h>
+#include <isc/parseint.h>
+#include <isc/print.h>
+#include <isc/region.h>
+#include <isc/result.h>
+#include <isc/stdio.h>
+#include <isc/string.h>
+#include <isc/types.h>
+#include <isc/util.h>
+
+#include <dns/cert.h>
+#include <dns/ds.h>
+#include <dns/dsdigest.h>
+#include <dns/keyflags.h>
+#include <dns/keyvalues.h>
+#include <dns/rcode.h>
+#include <dns/rdataclass.h>
+#include <dns/secalg.h>
+#include <dns/secproto.h>
+
+#define RETERR(x) \
+ do { \
+ isc_result_t _r = (x); \
+ if (_r != ISC_R_SUCCESS) \
+ return ((_r)); \
+ } while (0)
+
+#define NUMBERSIZE sizeof("037777777777") /* 2^32-1 octal + NUL */
+
+#define TOTEXTONLY 0x01
+
+#define RCODENAMES \
+ /* standard rcodes */ \
+ { dns_rcode_noerror, "NOERROR", 0 }, \
+ { dns_rcode_formerr, "FORMERR", 0 }, \
+ { dns_rcode_servfail, "SERVFAIL", 0 }, \
+ { dns_rcode_nxdomain, "NXDOMAIN", 0 }, \
+ { dns_rcode_notimp, "NOTIMP", 0 }, \
+ { dns_rcode_refused, "REFUSED", 0 }, \
+ { dns_rcode_yxdomain, "YXDOMAIN", 0 }, \
+ { dns_rcode_yxrrset, "YXRRSET", 0 }, \
+ { dns_rcode_nxrrset, "NXRRSET", 0 }, \
+ { dns_rcode_notauth, "NOTAUTH", 0 }, \
+ { dns_rcode_notzone, "NOTZONE", 0 }, \
+ { 11, "RESERVED11", TOTEXTONLY }, \
+ { 12, "RESERVED12", TOTEXTONLY }, \
+ { 13, "RESERVED13", TOTEXTONLY }, \
+ { 14, "RESERVED14", TOTEXTONLY }, \
+ { 15, "RESERVED15", TOTEXTONLY },
+
+#define ERCODENAMES \
+ /* extended rcodes */ \
+ { dns_rcode_badvers, "BADVERS", 0 }, \
+ { dns_rcode_badcookie, "BADCOOKIE", 0 }, { \
+ 0, NULL, 0 \
+ }
+
+#define TSIGRCODENAMES \
+ /* extended rcodes */ \
+ { dns_tsigerror_badsig, "BADSIG", 0 }, \
+ { dns_tsigerror_badkey, "BADKEY", 0 }, \
+ { dns_tsigerror_badtime, "BADTIME", 0 }, \
+ { dns_tsigerror_badmode, "BADMODE", 0 }, \
+ { dns_tsigerror_badname, "BADNAME", 0 }, \
+ { dns_tsigerror_badalg, "BADALG", 0 }, \
+ { dns_tsigerror_badtrunc, "BADTRUNC", 0 }, { \
+ 0, NULL, 0 \
+ }
+
+/* RFC4398 section 2.1 */
+
+#define CERTNAMES \
+ { 1, "PKIX", 0 }, { 2, "SPKI", 0 }, { 3, "PGP", 0 }, \
+ { 4, "IPKIX", 0 }, { 5, "ISPKI", 0 }, { 6, "IPGP", 0 }, \
+ { 7, "ACPKIX", 0 }, { 8, "IACPKIX", 0 }, { 253, "URI", 0 }, \
+ { 254, "OID", 0 }, { \
+ 0, NULL, 0 \
+ }
+
+/* RFC2535 section 7, RFC3110 */
+
+#define SECALGNAMES \
+ { DNS_KEYALG_RSAMD5, "RSAMD5", 0 }, { DNS_KEYALG_DH, "DH", 0 }, \
+ { DNS_KEYALG_DSA, "DSA", 0 }, \
+ { DNS_KEYALG_RSASHA1, "RSASHA1", 0 }, \
+ { DNS_KEYALG_NSEC3DSA, "NSEC3DSA", 0 }, \
+ { DNS_KEYALG_NSEC3RSASHA1, "NSEC3RSASHA1", 0 }, \
+ { DNS_KEYALG_RSASHA256, "RSASHA256", 0 }, \
+ { DNS_KEYALG_RSASHA512, "RSASHA512", 0 }, \
+ { DNS_KEYALG_ECCGOST, "ECCGOST", 0 }, \
+ { DNS_KEYALG_ECDSA256, "ECDSAP256SHA256", 0 }, \
+ { DNS_KEYALG_ECDSA256, "ECDSA256", 0 }, \
+ { DNS_KEYALG_ECDSA384, "ECDSAP384SHA384", 0 }, \
+ { DNS_KEYALG_ECDSA384, "ECDSA384", 0 }, \
+ { DNS_KEYALG_ED25519, "ED25519", 0 }, \
+ { DNS_KEYALG_ED448, "ED448", 0 }, \
+ { DNS_KEYALG_INDIRECT, "INDIRECT", 0 }, \
+ { DNS_KEYALG_PRIVATEDNS, "PRIVATEDNS", 0 }, \
+ { DNS_KEYALG_PRIVATEOID, "PRIVATEOID", 0 }, { \
+ 0, NULL, 0 \
+ }
+
+/* RFC2535 section 7.1 */
+
+#define SECPROTONAMES \
+ { 0, "NONE", 0 }, { 1, "TLS", 0 }, { 2, "EMAIL", 0 }, \
+ { 3, "DNSSEC", 0 }, { 4, "IPSEC", 0 }, { 255, "ALL", 0 }, { \
+ 0, NULL, 0 \
+ }
+
+#define HASHALGNAMES \
+ { 1, "SHA-1", 0 }, { 0, NULL, 0 }
+
+/* RFC3658, RFC4509, RFC5933, RFC6605 */
+
+#define DSDIGESTNAMES \
+ { DNS_DSDIGEST_SHA1, "SHA-1", 0 }, { DNS_DSDIGEST_SHA1, "SHA1", 0 }, \
+ { DNS_DSDIGEST_SHA256, "SHA-256", 0 }, \
+ { DNS_DSDIGEST_SHA256, "SHA256", 0 }, \
+ { DNS_DSDIGEST_GOST, "GOST", 0 }, \
+ { DNS_DSDIGEST_SHA384, "SHA-384", 0 }, \
+ { DNS_DSDIGEST_SHA384, "SHA384", 0 }, { \
+ 0, NULL, 0 \
+ }
+
+struct tbl {
+ unsigned int value;
+ const char *name;
+ int flags;
+};
+
+static struct tbl rcodes[] = { RCODENAMES ERCODENAMES };
+static struct tbl tsigrcodes[] = { RCODENAMES TSIGRCODENAMES };
+static struct tbl certs[] = { CERTNAMES };
+static struct tbl secalgs[] = { SECALGNAMES };
+static struct tbl secprotos[] = { SECPROTONAMES };
+static struct tbl hashalgs[] = { HASHALGNAMES };
+static struct tbl dsdigests[] = { DSDIGESTNAMES };
+
+static struct keyflag {
+ const char *name;
+ unsigned int value;
+ unsigned int mask;
+} keyflags[] = { { "NOCONF", 0x4000, 0xC000 },
+ { "NOAUTH", 0x8000, 0xC000 },
+ { "NOKEY", 0xC000, 0xC000 },
+ { "FLAG2", 0x2000, 0x2000 },
+ { "EXTEND", 0x1000, 0x1000 },
+ { "FLAG4", 0x0800, 0x0800 },
+ { "FLAG5", 0x0400, 0x0400 },
+ { "USER", 0x0000, 0x0300 },
+ { "ZONE", 0x0100, 0x0300 },
+ { "HOST", 0x0200, 0x0300 },
+ { "NTYP3", 0x0300, 0x0300 },
+ { "FLAG8", 0x0080, 0x0080 },
+ { "FLAG9", 0x0040, 0x0040 },
+ { "FLAG10", 0x0020, 0x0020 },
+ { "FLAG11", 0x0010, 0x0010 },
+ { "SIG0", 0x0000, 0x000F },
+ { "SIG1", 0x0001, 0x000F },
+ { "SIG2", 0x0002, 0x000F },
+ { "SIG3", 0x0003, 0x000F },
+ { "SIG4", 0x0004, 0x000F },
+ { "SIG5", 0x0005, 0x000F },
+ { "SIG6", 0x0006, 0x000F },
+ { "SIG7", 0x0007, 0x000F },
+ { "SIG8", 0x0008, 0x000F },
+ { "SIG9", 0x0009, 0x000F },
+ { "SIG10", 0x000A, 0x000F },
+ { "SIG11", 0x000B, 0x000F },
+ { "SIG12", 0x000C, 0x000F },
+ { "SIG13", 0x000D, 0x000F },
+ { "SIG14", 0x000E, 0x000F },
+ { "SIG15", 0x000F, 0x000F },
+ { "KSK", DNS_KEYFLAG_KSK, DNS_KEYFLAG_KSK },
+ { NULL, 0, 0 } };
+
+static isc_result_t
+str_totext(const char *source, isc_buffer_t *target) {
+ unsigned int l;
+ isc_region_t region;
+
+ isc_buffer_availableregion(target, &region);
+ l = strlen(source);
+
+ if (l > region.length) {
+ return (ISC_R_NOSPACE);
+ }
+
+ memmove(region.base, source, l);
+ isc_buffer_add(target, l);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+maybe_numeric(unsigned int *valuep, isc_textregion_t *source, unsigned int max,
+ bool hex_allowed) {
+ isc_result_t result;
+ uint32_t n;
+ char buffer[NUMBERSIZE];
+ int v;
+
+ if (!isdigit((unsigned char)source->base[0]) ||
+ source->length > NUMBERSIZE - 1)
+ {
+ return (ISC_R_BADNUMBER);
+ }
+
+ /*
+ * We have a potential number. Try to parse it with
+ * isc_parse_uint32(). isc_parse_uint32() requires
+ * null termination, so we must make a copy.
+ */
+ v = snprintf(buffer, sizeof(buffer), "%.*s", (int)source->length,
+ source->base);
+ if (v < 0 || (unsigned)v != source->length) {
+ return (ISC_R_BADNUMBER);
+ }
+ INSIST(buffer[source->length] == '\0');
+
+ result = isc_parse_uint32(&n, buffer, 10);
+ if (result == ISC_R_BADNUMBER && hex_allowed) {
+ result = isc_parse_uint32(&n, buffer, 16);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ if (n > max) {
+ return (ISC_R_RANGE);
+ }
+ *valuep = n;
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+dns_mnemonic_fromtext(unsigned int *valuep, isc_textregion_t *source,
+ struct tbl *table, unsigned int max) {
+ isc_result_t result;
+ int i;
+
+ result = maybe_numeric(valuep, source, max, false);
+ if (result != ISC_R_BADNUMBER) {
+ return (result);
+ }
+
+ for (i = 0; table[i].name != NULL; i++) {
+ unsigned int n;
+ n = strlen(table[i].name);
+ if (n == source->length && (table[i].flags & TOTEXTONLY) == 0 &&
+ strncasecmp(source->base, table[i].name, n) == 0)
+ {
+ *valuep = table[i].value;
+ return (ISC_R_SUCCESS);
+ }
+ }
+ return (DNS_R_UNKNOWN);
+}
+
+static isc_result_t
+dns_mnemonic_totext(unsigned int value, isc_buffer_t *target,
+ struct tbl *table) {
+ int i = 0;
+ char buf[sizeof("4294967296")];
+ while (table[i].name != NULL) {
+ if (table[i].value == value) {
+ return (str_totext(table[i].name, target));
+ }
+ i++;
+ }
+ snprintf(buf, sizeof(buf), "%u", value);
+ return (str_totext(buf, target));
+}
+
+isc_result_t
+dns_rcode_fromtext(dns_rcode_t *rcodep, isc_textregion_t *source) {
+ unsigned int value;
+ RETERR(dns_mnemonic_fromtext(&value, source, rcodes, 0xffff));
+ *rcodep = value;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_rcode_totext(dns_rcode_t rcode, isc_buffer_t *target) {
+ return (dns_mnemonic_totext(rcode, target, rcodes));
+}
+
+isc_result_t
+dns_tsigrcode_fromtext(dns_rcode_t *rcodep, isc_textregion_t *source) {
+ unsigned int value;
+ RETERR(dns_mnemonic_fromtext(&value, source, tsigrcodes, 0xffff));
+ *rcodep = value;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_tsigrcode_totext(dns_rcode_t rcode, isc_buffer_t *target) {
+ return (dns_mnemonic_totext(rcode, target, tsigrcodes));
+}
+
+isc_result_t
+dns_cert_fromtext(dns_cert_t *certp, isc_textregion_t *source) {
+ unsigned int value;
+ RETERR(dns_mnemonic_fromtext(&value, source, certs, 0xffff));
+ *certp = value;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_cert_totext(dns_cert_t cert, isc_buffer_t *target) {
+ return (dns_mnemonic_totext(cert, target, certs));
+}
+
+isc_result_t
+dns_secalg_fromtext(dns_secalg_t *secalgp, isc_textregion_t *source) {
+ unsigned int value;
+ RETERR(dns_mnemonic_fromtext(&value, source, secalgs, 0xff));
+ *secalgp = value;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_secalg_totext(dns_secalg_t secalg, isc_buffer_t *target) {
+ return (dns_mnemonic_totext(secalg, target, secalgs));
+}
+
+void
+dns_secalg_format(dns_secalg_t alg, char *cp, unsigned int size) {
+ isc_buffer_t b;
+ isc_region_t r;
+ isc_result_t result;
+
+ REQUIRE(cp != NULL && size > 0);
+ isc_buffer_init(&b, cp, size - 1);
+ result = dns_secalg_totext(alg, &b);
+ isc_buffer_usedregion(&b, &r);
+ r.base[r.length] = 0;
+ if (result != ISC_R_SUCCESS) {
+ r.base[0] = 0;
+ }
+}
+
+isc_result_t
+dns_secproto_fromtext(dns_secproto_t *secprotop, isc_textregion_t *source) {
+ unsigned int value;
+ RETERR(dns_mnemonic_fromtext(&value, source, secprotos, 0xff));
+ *secprotop = value;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_secproto_totext(dns_secproto_t secproto, isc_buffer_t *target) {
+ return (dns_mnemonic_totext(secproto, target, secprotos));
+}
+
+isc_result_t
+dns_hashalg_fromtext(unsigned char *hashalg, isc_textregion_t *source) {
+ unsigned int value;
+ RETERR(dns_mnemonic_fromtext(&value, source, hashalgs, 0xff));
+ *hashalg = value;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_keyflags_fromtext(dns_keyflags_t *flagsp, isc_textregion_t *source) {
+ isc_result_t result;
+ char *text, *end;
+ unsigned int value = 0;
+#ifdef notyet
+ unsigned int mask = 0;
+#endif /* ifdef notyet */
+
+ result = maybe_numeric(&value, source, 0xffff, true);
+ if (result == ISC_R_SUCCESS) {
+ *flagsp = value;
+ return (ISC_R_SUCCESS);
+ }
+ if (result != ISC_R_BADNUMBER) {
+ return (result);
+ }
+
+ text = source->base;
+ end = source->base + source->length;
+
+ while (text < end) {
+ struct keyflag *p;
+ unsigned int len;
+ char *delim = memchr(text, '|', end - text);
+ if (delim != NULL) {
+ len = (unsigned int)(delim - text);
+ } else {
+ len = (unsigned int)(end - text);
+ }
+ for (p = keyflags; p->name != NULL; p++) {
+ if (strncasecmp(p->name, text, len) == 0) {
+ break;
+ }
+ }
+ if (p->name == NULL) {
+ return (DNS_R_UNKNOWNFLAG);
+ }
+ value |= p->value;
+#ifdef notyet
+ if ((mask & p->mask) != 0) {
+ warn("overlapping key flags");
+ }
+ mask |= p->mask;
+#endif /* ifdef notyet */
+ text += len;
+ if (delim != NULL) {
+ text++; /* Skip "|" */
+ }
+ }
+ *flagsp = value;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_dsdigest_fromtext(dns_dsdigest_t *dsdigestp, isc_textregion_t *source) {
+ unsigned int value;
+ RETERR(dns_mnemonic_fromtext(&value, source, dsdigests, 0xff));
+ *dsdigestp = value;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_dsdigest_totext(dns_dsdigest_t dsdigest, isc_buffer_t *target) {
+ return (dns_mnemonic_totext(dsdigest, target, dsdigests));
+}
+
+void
+dns_dsdigest_format(dns_dsdigest_t typ, char *cp, unsigned int size) {
+ isc_buffer_t b;
+ isc_region_t r;
+ isc_result_t result;
+
+ REQUIRE(cp != NULL && size > 0);
+ isc_buffer_init(&b, cp, size - 1);
+ result = dns_dsdigest_totext(typ, &b);
+ isc_buffer_usedregion(&b, &r);
+ r.base[r.length] = 0;
+ if (result != ISC_R_SUCCESS) {
+ r.base[0] = 0;
+ }
+}
+
+/*
+ * This uses lots of hard coded values, but how often do we actually
+ * add classes?
+ */
+isc_result_t
+dns_rdataclass_fromtext(dns_rdataclass_t *classp, isc_textregion_t *source) {
+#define COMPARE(string, rdclass) \
+ if (((sizeof(string) - 1) == source->length) && \
+ (strncasecmp(source->base, string, source->length) == 0)) \
+ { \
+ *classp = rdclass; \
+ return (ISC_R_SUCCESS); \
+ }
+
+ switch (tolower((unsigned char)source->base[0])) {
+ case 'a':
+ COMPARE("any", dns_rdataclass_any);
+ break;
+ case 'c':
+ /*
+ * RFC1035 says the mnemonic for the CHAOS class is CH,
+ * but historical BIND practice is to call it CHAOS.
+ * We will accept both forms, but only generate CH.
+ */
+ COMPARE("ch", dns_rdataclass_chaos);
+ COMPARE("chaos", dns_rdataclass_chaos);
+
+ if (source->length > 5 &&
+ source->length < (5 + sizeof("65000")) &&
+ strncasecmp("class", source->base, 5) == 0)
+ {
+ char buf[sizeof("65000")];
+ char *endp;
+ unsigned int val;
+
+ /*
+ * source->base is not required to be NUL terminated.
+ * Copy up to remaining bytes and NUL terminate.
+ */
+ snprintf(buf, sizeof(buf), "%.*s",
+ (int)(source->length - 5), source->base + 5);
+ val = strtoul(buf, &endp, 10);
+ if (*endp == '\0' && val <= 0xffff) {
+ *classp = (dns_rdataclass_t)val;
+ return (ISC_R_SUCCESS);
+ }
+ }
+ break;
+ case 'h':
+ COMPARE("hs", dns_rdataclass_hs);
+ COMPARE("hesiod", dns_rdataclass_hs);
+ break;
+ case 'i':
+ COMPARE("in", dns_rdataclass_in);
+ break;
+ case 'n':
+ COMPARE("none", dns_rdataclass_none);
+ break;
+ case 'r':
+ COMPARE("reserved0", dns_rdataclass_reserved0);
+ break;
+ }
+
+#undef COMPARE
+
+ return (DNS_R_UNKNOWN);
+}
+
+isc_result_t
+dns_rdataclass_totext(dns_rdataclass_t rdclass, isc_buffer_t *target) {
+ switch (rdclass) {
+ case dns_rdataclass_any:
+ return (str_totext("ANY", target));
+ case dns_rdataclass_chaos:
+ return (str_totext("CH", target));
+ case dns_rdataclass_hs:
+ return (str_totext("HS", target));
+ case dns_rdataclass_in:
+ return (str_totext("IN", target));
+ case dns_rdataclass_none:
+ return (str_totext("NONE", target));
+ case dns_rdataclass_reserved0:
+ return (str_totext("RESERVED0", target));
+ default:
+ return (dns_rdataclass_tounknowntext(rdclass, target));
+ }
+}
+
+isc_result_t
+dns_rdataclass_tounknowntext(dns_rdataclass_t rdclass, isc_buffer_t *target) {
+ char buf[sizeof("CLASS65535")];
+
+ snprintf(buf, sizeof(buf), "CLASS%u", rdclass);
+ return (str_totext(buf, target));
+}
+
+void
+dns_rdataclass_format(dns_rdataclass_t rdclass, char *array,
+ unsigned int size) {
+ isc_result_t result;
+ isc_buffer_t buf;
+
+ if (size == 0U) {
+ return;
+ }
+
+ isc_buffer_init(&buf, array, size);
+ result = dns_rdataclass_totext(rdclass, &buf);
+ /*
+ * Null terminate.
+ */
+ if (result == ISC_R_SUCCESS) {
+ if (isc_buffer_availablelength(&buf) >= 1) {
+ isc_buffer_putuint8(&buf, 0);
+ } else {
+ result = ISC_R_NOSPACE;
+ }
+ }
+ if (result != ISC_R_SUCCESS) {
+ strlcpy(array, "<unknown>", size);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-04 00:08:20 +0000