Adding upstream version 1:9.18.19.upstream/1%9.18.19upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 219 insertions, 0 deletions

diff --git a/fuzz/dns_rdata_fromwire_text.c b/fuzz/dns_rdata_fromwire_text.c
new file mode 100644
index 0000000..f05ddd4
--- /dev/null
+++ b/fuzz/dns_rdata_fromwire_text.c
@@ -0,0 +1,219 @@
+/*
+ * 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 <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>
+
+#include "fuzz.h"
+
+bool debug = false;
+
+/*
+ * 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.
+ */
+
+static isc_mem_t *mctx = NULL;
+static isc_lex_t *lex = NULL;
+
+int
+LLVMFuzzerInitialize(int *argc __attribute__((unused)),
+		     char ***argv __attribute__((unused))) {
+	isc_lexspecials_t specials;
+
+	isc_mem_create(&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);
+
+	return (0);
+}
+
+static void
+nullmsg(dns_rdatacallbacks_t *cb, const char *fmt, ...) {
+	va_list args;
+
+	UNUSED(cb);
+
+	if (debug) {
+		va_start(args, fmt);
+		vfprintf(stderr, fmt, args);
+		fprintf(stderr, "\n");
+		va_end(args);
+	}
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+	char totext[64 * 1044 * 4];
+	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_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;
+
+	/*
+	 * First 2 bytes are used to select type and class.
+	 * dns_rdata_fromwire() only accepts input up to 2^16-1 octets.
+	 */
+	if (size < 2 || size > 0xffff + 2) {
+		return (0);
+	}
+
+	/*
+	 * 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--;
+
+	if (debug) {
+		fprintf(stderr, "type=%u, class=%u\n", rdtype, rdclass);
+	}
+
+	dns_rdatacallbacks_init(&callbacks);
+	callbacks.warn = callbacks.error = nullmsg;
+
+	/* Disallow decompression as we are reading a packet */
+	dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_NONE);
+
+	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));
+	assert(rdata1.length == size);
+
+	/*
+	 * Convert to text from wire.
+	 */
+	isc_buffer_init(&target, totext, sizeof(totext) - 1);
+	result = dns_rdata_totext(&rdata1, NULL, &target);
+	assert(result == ISC_R_SUCCESS);
+
+	/*
+	 * Make debugging easier by NUL terminating.
+	 */
+	totext[isc_buffer_usedlength(&target)] = 0;
+
+	/*
+	 * 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);
+	if (debug && result != ISC_R_SUCCESS) {
+		fprintf(stderr, "'%s'\n", totext);
+	}
+	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_disable(&cctx);
+	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));
+
+	return (0);
+}