2016-12-31 13:06:16 +00:00
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/* Test __libc_res_nsend buffer mismanagement, basic TCP coverage.
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2023-01-06 21:08:04 +00:00
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Copyright (C) 2016-2023 Free Software Foundation, Inc.
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2016-12-31 13:06:16 +00:00
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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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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2016-12-31 13:06:16 +00:00
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#include <errno.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdio.h>
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2017-02-16 22:31:42 +00:00
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#include <stdlib.h>
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2016-12-31 13:06:16 +00:00
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#include <string.h>
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#include <support/check.h>
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#include <support/check_nss.h>
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#include <support/resolv_test.h>
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#include <support/xthread.h>
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#include <support/xmemstream.h>
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static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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static int initial_address_count = 1;
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static int subsequent_address_count = 2000;
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static int response_number = 0;
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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_VERIFY_EXIT (qname != NULL);
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/* If not using TCP, just force its use. */
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if (!ctx->tcp)
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{
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struct resolv_response_flags flags = {.tc = true};
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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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return;
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}
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struct resolv_response_flags flags = {};
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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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/* The number of addresses (in the additional section) for the name
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server record (in the authoritative section). */
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int address_count;
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xpthread_mutex_lock (&lock);
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++response_number;
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if (response_number == 1)
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address_count = initial_address_count;
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else if (response_number == 2)
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{
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address_count = 0;
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resolv_response_drop (b);
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resolv_response_close (b);
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}
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else
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address_count = subsequent_address_count;
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xpthread_mutex_unlock (&lock);
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/* Only add the address record to the answer section if we requested
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any name server addresses. */
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if (address_count > 0)
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{
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resolv_response_open_record (b, qname, qclass, qtype, 0);
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switch (qtype)
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{
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case T_A:
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{
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char ipv4[4] = {10, response_number >> 8, response_number, 0};
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ipv4[3] = 2 * ctx->tcp + 4 * ctx->server_index;
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resolv_response_add_data (b, &ipv4, sizeof (ipv4));
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}
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break;
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case T_AAAA:
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{
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char ipv6[16]
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= {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0,
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response_number >> 8, response_number, 0, 0};
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ipv6[15] = 2 * ctx->tcp + 4 * ctx->server_index;
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resolv_response_add_data (b, &ipv6, sizeof (ipv6));
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}
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break;
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default:
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support_record_failure ();
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printf ("error: unexpected QTYPE: %s/%u/%u\n",
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qname, qclass, qtype);
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}
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resolv_response_close_record (b);
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/* Add the name server record. */
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resolv_response_section (b, ns_s_ns);
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resolv_response_open_record (b, "example", C_IN, T_NS, 0);
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resolv_response_add_name (b, "ns.example");
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resolv_response_close_record (b);
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/* Increase the response size with name server addresses. These
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addresses are not copied out of nss_dns, and thus do not
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trigger getaddrinfo retries with a larger buffer, making
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testing more predictable. */
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resolv_response_section (b, ns_s_ar);
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for (int i = 1; i <= address_count; ++i)
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{
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resolv_response_open_record (b, "ns.example", qclass, qtype, 0);
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switch (qtype)
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{
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case T_A:
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{
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char ipv4[4] = {response_number, i >> 8, i, 0};
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ipv4[3] = 2 * ctx->tcp + 4 * ctx->server_index;
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resolv_response_add_data (b, &ipv4, sizeof (ipv4));
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}
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break;
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case T_AAAA:
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{
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char ipv6[16]
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= {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0,
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response_number >> 8, response_number,
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i >> 8, i, 0, 0};
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ipv6[15] = 2 * ctx->tcp + 4 * ctx->server_index;
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resolv_response_add_data (b, &ipv6, sizeof (ipv6));
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}
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break;
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default:
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support_record_failure ();
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printf ("error: unexpected QTYPE: %s/%u/%u\n",
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qname, qclass, qtype);
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}
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resolv_response_close_record (b);
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}
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}
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}
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static char *
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expected_result (unsigned port, unsigned response_number)
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{
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struct xmemstream mem;
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xopen_memstream (&mem);
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/* We fail the second TCP query to the first server by closing the
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connection immediately, without returning any data. This should
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cause failover to the second server. */
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int server_index = 1;
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fprintf (mem.out, "address: STREAM/TCP 10.%u.%u.%u %u\n",
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(response_number >> 8) & 0xff, response_number & 0xff,
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2 + 4 * server_index, port);
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fprintf (mem.out, "address: STREAM/TCP 2001:db8::%x:%x %u\n",
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(response_number + 1) & 0xffff,
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2 + 4 * server_index, port);
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xfclose_memstream (&mem);
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return mem.buffer;
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}
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static void
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test_different_sizes (void)
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{
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struct addrinfo hints =
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{
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.ai_family = AF_UNSPEC,
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.ai_socktype = SOCK_STREAM,
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.ai_protocol = IPPROTO_TCP,
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};
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struct addrinfo *ai;
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char *expected;
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int ret;
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/* This magic number produces a response size close to 2048
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bytes. */
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initial_address_count = 124;
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response_number = 0;
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ret = getaddrinfo ("www.example", "80", &hints, &ai);
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expected = expected_result (80, 3);
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check_addrinfo ("www.example:80", ai, ret, expected);
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if (ret == 0)
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freeaddrinfo (ai);
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free (expected);
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response_number = 0;
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ret = getaddrinfo ("www123.example", "80", &hints, &ai);
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if (ret == 0)
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freeaddrinfo (ai);
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response_number = 0;
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ret = getaddrinfo ("www1234.example", "80", &hints, &ai);
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if (ret == 0)
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freeaddrinfo (ai);
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response_number = 0;
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ret = getaddrinfo ("www12345.example", "80", &hints, &ai);
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if (ret == 0)
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freeaddrinfo (ai);
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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 *obj = 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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test_different_sizes ();
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_res.options |= RES_SNGLKUP;
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test_different_sizes ();
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_res.options |= RES_SNGLKUPREOP;
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test_different_sizes ();
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resolv_test_end (obj);
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return 0;
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}
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#include <support/test-driver.c>
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