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401311cfba
The old implementation based on hsearch_r used an ad-hoc C string encoding and produced an incorrect format on the wire for domain names which contained bytes which needed escaping when printed. This commit switches to ns_name_pton for the wire format conversion (now that we have separate tests for it) and uses a tsearch tree with a suitable comparison function to locate compression targets.
121 lines
4.0 KiB
C
121 lines
4.0 KiB
C
/* Test handling of binary domain names with res_send.
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Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <resolv.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/resolv_test.h>
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static void
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response (const struct resolv_response_context *ctx,
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struct resolv_response_builder *b,
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const char *qname, uint16_t qclass, uint16_t qtype)
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{
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TEST_COMPARE (qclass, C_IN);
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TEST_COMPARE (qtype, T_TXT);
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TEST_VERIFY (strlen (qname) <= 255);
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struct resolv_response_flags flags = { 0 };
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resolv_response_init (b, flags);
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resolv_response_add_question (b, qname, qclass, qtype);
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resolv_response_section (b, ns_s_an);
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resolv_response_open_record (b, qname, qclass, T_TXT, 0x12345678);
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unsigned char qnamelen = strlen (qname);
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resolv_response_add_data (b, &qnamelen, 1);
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resolv_response_add_data (b, qname, qnamelen);
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resolv_response_close_record (b);
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}
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static int
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do_test (void)
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{
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struct resolv_test *aux = resolv_test_start
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((struct resolv_redirect_config)
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{
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.response_callback = response,
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});
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for (int b = 0; b <= 255; ++b)
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{
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unsigned char query[] =
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{
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b, b, /* Transaction ID. */
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1, 0, /* Query with RD flag. */
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0, 1, /* One question. */
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0, 0, 0, 0, 0, 0, /* The other sections are empty. */
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1, b, 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 0,
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0, T_TXT, /* TXT query. */
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0, 1, /* Class IN. */
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};
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unsigned char response[512];
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int ret = res_send (query, sizeof (query), response, sizeof (response));
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char expected_name[20];
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/* The name is uncompressed in the query, so we can reference it
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directly. */
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TEST_VERIFY_EXIT (ns_name_ntop (query + 12, expected_name,
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sizeof (expected_name)) >= 0);
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TEST_COMPARE (ret,
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(ssize_t) sizeof (query)
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+ 2 /* Compression reference. */
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+ 2 + 2 + 4 + 2 /* Type, class, TTL, RDATA length. */
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+ 1 /* Pascal-style string length. */
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+ strlen (expected_name));
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/* Mark as answer, with recursion available, and one answer. */
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query[2] = 0x81;
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query[3] = 0x80;
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query[7] = 1;
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/* Prefix of the response must match the query. */
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TEST_COMPARE (memcmp (response, query, sizeof (query)), 0);
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/* The actual answer follows, starting with the compression
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reference. */
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unsigned char *p = response + sizeof (query);
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TEST_COMPARE (*p++, 0xc0);
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TEST_COMPARE (*p++, 0x0c);
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/* Type and class. */
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TEST_COMPARE (*p++, 0);
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TEST_COMPARE (*p++, T_TXT);
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TEST_COMPARE (*p++, 0);
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TEST_COMPARE (*p++, C_IN);
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/* TTL. */
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TEST_COMPARE (*p++, 0x12);
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TEST_COMPARE (*p++, 0x34);
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TEST_COMPARE (*p++, 0x56);
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TEST_COMPARE (*p++, 0x78);
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/* RDATA length. */
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TEST_COMPARE (*p++, 0);
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TEST_COMPARE (*p++, 1 + strlen (expected_name));
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/* RDATA. */
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TEST_COMPARE (*p++, strlen (expected_name));
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TEST_COMPARE (memcmp (p, expected_name, strlen (expected_name)), 0);
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}
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resolv_test_end (aux);
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return 0;
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}
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#include <support/test-driver.c>
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