--- /dev/null
+/*
+ * Copyright (C) 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/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <isc/buffer.h>
+#include <isc/lex.h>
+#include <isc/mem.h>
+#include <isc/result.h>
+#include <isc/util.h>
+
+#include <dns/callbacks.h>
+#include <dns/compress.h>
+#include <dns/master.h>
+#include <dns/rdata.h>
+#include <dns/rdatatype.h>
+
+#define CHECK(x) ({ if ((result = (x)) != ISC_R_SUCCESS) goto done; })
+
+/*
+ * Fuzz input to dns_rdata_fromwire(). Then convert the result
+ * to text, back to wire format, to multiline text, and back to wire
+ * format again, checking for consistency throughout the sequence.
+ */
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
+
+static void
+nullmsg(dns_rdatacallbacks_t *cb, const char *fmt, ...) {
+ va_list ap;
+
+ UNUSED(cb);
+ UNUSED(fmt);
+ UNUSED(ap);
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+ char totext[1024];
+ dns_compress_t cctx;
+ dns_decompress_t dctx;
+ dns_rdatatype_t rdtype;
+ dns_rdataclass_t rdclass;
+ dns_rdatatype_t typelist[256] = { 1000 }; /* unknown */
+ dns_rdataclass_t classlist[] = { dns_rdataclass_in,
+ dns_rdataclass_hs,
+ dns_rdataclass_ch,
+ dns_rdataclass_any,
+ 60 };
+ dns_rdata_t rdata1 = DNS_RDATA_INIT,
+ rdata2 = DNS_RDATA_INIT,
+ rdata3 = DNS_RDATA_INIT;
+ dns_rdatacallbacks_t callbacks;
+ isc_buffer_t source, target;
+ isc_lex_t *lex = NULL;
+ isc_lexspecials_t specials;
+ isc_mem_t *mctx = NULL;
+ isc_result_t result;
+ unsigned char fromtext[1024];
+ unsigned char fromwire[1024];
+ unsigned char towire[1024];
+ unsigned int classes = (sizeof(classlist)/sizeof(classlist[0]));
+ unsigned int types = 1, flags, t;
+
+ if (size < 2) {
+ goto done;
+ }
+
+ /*
+ * Append known types to list.
+ */
+ for (t = 1; t <= 0x10000; t++) {
+ char typebuf[256];
+ if (dns_rdatatype_ismeta(t)) {
+ continue;
+ }
+ dns_rdatatype_format(t, typebuf, sizeof(typebuf));
+ if (strncmp(typebuf, "TYPE", 4) != 0) {
+ /* Assert when we need to grow typelist. */
+ assert(types < sizeof(typelist)/sizeof(typelist[0]));
+ typelist[types++] = t;
+ }
+ }
+
+ /*
+ * Random type and class from a limited set.
+ */
+ rdtype = typelist[(*data++) % types]; size--;
+ rdclass = classlist[(*data++) % classes]; size--;
+
+ CHECK(isc_mem_create(0, 0, &mctx));
+
+ CHECK(isc_lex_create(mctx, 64, &lex));
+ memset(specials, 0, sizeof(specials));
+ specials[0] = 1;
+ specials['('] = 1;
+ specials[')'] = 1;
+ specials['"'] = 1;
+ isc_lex_setspecials(lex, specials);
+ isc_lex_setcomments(lex, ISC_LEXCOMMENT_DNSMASTERFILE);
+
+ dns_rdatacallbacks_init(&callbacks);
+ callbacks.warn = callbacks.error = nullmsg;
+
+ dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_ANY);
+
+ isc_buffer_constinit(&source, data, size);
+ isc_buffer_add(&source, size);
+ isc_buffer_setactive(&source, size);
+
+ isc_buffer_init(&target, fromwire, sizeof(fromwire));
+
+ /*
+ * Reject invalid rdata.
+ */
+ CHECK(dns_rdata_fromwire(&rdata1, rdclass, rdtype, &source, &dctx,
+ 0, &target));
+
+ /*
+ * Convert to text from wire.
+ */
+ isc_buffer_init(&target, totext, sizeof(totext));
+ result = dns_rdata_totext(&rdata1, NULL, &target);
+ assert(result == ISC_R_SUCCESS);
+
+ /*
+ * Convert to wire from text.
+ */
+ isc_buffer_constinit(&source, totext, isc_buffer_usedlength(&target));
+ isc_buffer_add(&source, isc_buffer_usedlength(&target));
+ CHECK(isc_lex_openbuffer(lex, &source));
+
+ isc_buffer_init(&target, fromtext, sizeof(fromtext));
+ result = dns_rdata_fromtext(&rdata2, rdclass, rdtype, lex,
+ dns_rootname, 0, mctx, &target,
+ &callbacks);
+ assert(result == ISC_R_SUCCESS);
+ assert(rdata2.length == size);
+ assert(!memcmp(rdata2.data, data, size));
+
+ /*
+ * Convert to multi-line text from wire.
+ */
+ isc_buffer_init(&target, totext, sizeof(totext));
+ flags = dns_master_styleflags(&dns_master_style_default);
+ result = dns_rdata_tofmttext(&rdata1, dns_rootname, flags,
+ 80 - 32, 4, "\n", &target);
+ assert(result == ISC_R_SUCCESS);
+
+ /*
+ * Convert to wire from text.
+ */
+ isc_buffer_constinit(&source, totext, isc_buffer_usedlength(&target));
+ isc_buffer_add(&source, isc_buffer_usedlength(&target));
+ CHECK(isc_lex_openbuffer(lex, &source));
+
+ isc_buffer_init(&target, fromtext, sizeof(fromtext));
+ result = dns_rdata_fromtext(&rdata3, rdclass, rdtype, lex,
+ dns_rootname, 0, mctx, &target,
+ &callbacks);
+ assert(result == ISC_R_SUCCESS);
+ assert(rdata3.length == size);
+ assert(!memcmp(rdata3.data, data, size));
+
+ /*
+ * Convert rdata back to wire.
+ */
+ CHECK(dns_compress_init(&cctx, -1, mctx));
+ dns_compress_setsensitive(&cctx, true);
+ isc_buffer_init(&target, towire, sizeof(towire));
+ result = dns_rdata_towire(&rdata1, &cctx, &target);
+ dns_compress_invalidate(&cctx);
+ assert(result == ISC_R_SUCCESS);
+ assert(target.used == size);
+ assert(!memcmp(target.base, data, size));
+
+ done:
+ if (lex != NULL) {
+ isc_lex_destroy(&lex);
+ }
+ if (lex != NULL) {
+ isc_mem_detach(&mctx);
+ }
+ return (0);
+}
projects / thirdparty / bind9.git / commitdiff
