glibc/resolv/tst-resolv-rotate.c

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/* Check that RES_ROTATE works with few nameserver entries (bug 13028).
Copyright (C) 2017-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
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 13:40:42 +08:00
<https://www.gnu.org/licenses/>. */
#include <netdb.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/check_nss.h>
#include <support/resolv_test.h>
#include <support/test-driver.h>
static volatile int drop_server = -1;
static volatile unsigned int query_counts[resolv_max_test_servers];
static const char address_ipv4[4] = {192, 0, 2, 1};
static const char address_ipv6[16]
= {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
static void
response (const struct resolv_response_context *ctx,
struct resolv_response_builder *b,
const char *qname, uint16_t qclass, uint16_t qtype)
{
if (ctx->server_index == drop_server)
{
resolv_response_drop (b);
resolv_response_close (b);
return;
}
bool force_tcp = strncmp (qname, "2.", 2) == 0;
struct resolv_response_flags flags = {.tc = force_tcp && !ctx->tcp};
resolv_response_init (b, flags);
resolv_response_add_question (b, qname, qclass, qtype);
if (flags.tc)
return;
TEST_VERIFY_EXIT (ctx->server_index < resolv_max_test_servers);
++query_counts[ctx->server_index];
resolv_response_section (b, ns_s_an);
resolv_response_open_record (b, qname, qclass, qtype, 0);
switch (qtype)
{
case T_A:
{
char addr[sizeof (address_ipv4)];
memcpy (addr, address_ipv4, sizeof (address_ipv4));
addr[3] = 1 + ctx->tcp;
resolv_response_add_data (b, addr, sizeof (addr));
}
break;
case T_AAAA:
{
char addr[sizeof (address_ipv6)];
memcpy (addr, address_ipv6, sizeof (address_ipv6));
addr[15] = 1 + ctx->tcp;
resolv_response_add_data (b, addr, sizeof (addr));
}
break;
case T_PTR:
if (force_tcp)
resolv_response_add_name (b, "2.host.example");
else
resolv_response_add_name (b, "host.example");
break;
default:
FAIL_EXIT1 ("unexpected QTYPE: %s/%u/%u", qname, qclass, qtype);
}
resolv_response_close_record (b);
}
static void
check_forward_1 (const char *name, int family)
{
unsigned char lsb;
if (strncmp (name, "2.", 2) == 0)
lsb = 2;
else
lsb = 1;
char expected_hostent_v4[200];
snprintf (expected_hostent_v4, sizeof (expected_hostent_v4),
"name: %s\naddress: 192.0.2.%d\n", name, lsb);
char expected_hostent_v6[200];
snprintf (expected_hostent_v6, sizeof (expected_hostent_v6),
"name: %s\naddress: 2001:db8::%d\n", name, lsb);
char expected_ai[200];
unsigned char address[16];
size_t address_length;
char *expected_hostent;
switch (family)
{
case AF_INET:
expected_hostent = expected_hostent_v4;
snprintf (expected_ai, sizeof (expected_ai),
"address: STREAM/TCP 192.0.2.%d 80\n", lsb);
TEST_VERIFY_EXIT (sizeof (address_ipv4) == sizeof (struct in_addr));
memcpy (address, address_ipv4, sizeof (address_ipv4));
address_length = sizeof (address_ipv4);
break;
case AF_INET6:
expected_hostent = expected_hostent_v6;
snprintf (expected_ai, sizeof (expected_ai),
"address: STREAM/TCP 2001:db8::%d 80\n", lsb);
TEST_VERIFY_EXIT (sizeof (address_ipv6) == sizeof (struct in6_addr));
memcpy (address, address_ipv6, sizeof (address_ipv6));
address_length = sizeof (address_ipv6);
break;
case AF_UNSPEC:
expected_hostent = NULL;
snprintf (expected_ai, sizeof (expected_ai),
"address: STREAM/TCP 192.0.2.%d 80\n"
"address: STREAM/TCP 2001:db8::%d 80\n",
lsb, lsb);
address_length = 0;
break;
default:
FAIL_EXIT1 ("unknown address family %d", family);
}
if (family == AF_INET)
{
struct hostent *e = gethostbyname (name);
check_hostent (name, e, expected_hostent_v4);
}
if (family != AF_UNSPEC)
{
struct hostent *e = gethostbyname2 (name, family);
check_hostent (name, e, expected_hostent);
}
if (address_length > 0)
{
address[address_length - 1] = lsb;
struct hostent *e = gethostbyaddr (address, address_length, family);
check_hostent (name, e, expected_hostent);
}
struct addrinfo hints =
{
.ai_family = family,
.ai_socktype = SOCK_STREAM,
.ai_protocol = IPPROTO_TCP,
};
struct addrinfo *ai;
int ret = getaddrinfo (name, "80", &hints, &ai);
check_addrinfo (name, ai, ret, expected_ai);
if (ret == 0)
{
for (struct addrinfo *p = ai; p != NULL; p = p->ai_next)
{
char host[200];
ret = getnameinfo (p->ai_addr, p->ai_addrlen,
host, sizeof (host),
NULL, 0, /* service */
0);
if (ret != 0)
{
support_record_failure ();
printf ("error: getnameinfo: %d\n", ret);
}
else
{
if (lsb == 1)
TEST_VERIFY (strcmp (host, "host.example") == 0);
else
TEST_VERIFY (strcmp (host, "2.host.example") == 0);
}
}
freeaddrinfo (ai);
}
}
static void
check_forward (int family)
{
check_forward_1 ("host.example", family);
check_forward_1 ("2.host.example", family);
}
static int
do_test (void)
{
for (int force_tcp = 0; force_tcp < 2; ++force_tcp)
for (int nscount = 1; nscount <= 3; ++nscount)
for (int disable_server = -1; disable_server < nscount; ++disable_server)
for (drop_server = -1; drop_server < nscount; ++drop_server)
{
/* A disabled server will never receive queries and
therefore cannot drop them. */
if (drop_server >= 0 && drop_server == disable_server)
continue;
/* No servers remaining to query, all queries are expected
to fail. */
int broken_servers = (disable_server >= 0) + (drop_server >= 0);
if (nscount <= broken_servers)
continue;
if (test_verbose > 0)
printf ("info: tcp=%d nscount=%d disable=%d drop=%d\n",
force_tcp, nscount, disable_server, drop_server);
struct resolv_redirect_config config =
{
.response_callback = response,
.nscount = nscount
};
if (disable_server >= 0)
{
config.servers[disable_server].disable_udp = true;
config.servers[disable_server].disable_tcp = true;
}
struct resolv_test *aux = resolv_test_start (config);
_res.options |= RES_ROTATE;
/* Run a few queries to make sure that all of them
succeed. We always perform more than nscount queries,
so we cover all active servers due to RES_ROTATE. */
for (size_t i = 0; i < resolv_max_test_servers; ++i)
query_counts[i] = 0;
check_forward (AF_INET);
check_forward (AF_INET6);
check_forward (AF_UNSPEC);
for (int i = 0; i < nscount; ++i)
{
if (i != disable_server && i != drop_server
&& query_counts[i] == 0)
{
support_record_failure ();
printf ("error: nscount=%d, but no query to server %d\n",
nscount, i);
}
}
resolv_test_end (aux);
}
return 0;
}
#define TIMEOUT 300
#include <support/test-driver.c>