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glibc/resolv/tst-resolv-noaaaa.c

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/* Test the RES_NOAAAA resolver option.
Copyright (C) 2022-2024 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <netdb.h>
#include <resolv.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/check_nss.h>
#include <support/resolv_test.h>
#include <support/support.h>
/* Used to keep track of the number of queries. */
static volatile unsigned int queries;
static void
response (const struct resolv_response_context *ctx,
struct resolv_response_builder *b,
const char *qname, uint16_t qclass, uint16_t qtype)
{
/* Each test should only send one query. */
++queries;
TEST_COMPARE (queries, 1);
/* AAAA queries are supposed to be disabled. */
TEST_VERIFY (qtype != T_AAAA);
TEST_COMPARE (qclass, C_IN);
/* The only other query type besides A is PTR. */
if (qtype != T_A)
TEST_COMPARE (qtype, T_PTR);
int an, ns, ar;
char *tail;
if (sscanf (qname, "an%d.ns%d.ar%d.%ms", &an, &ns, &ar, &tail) != 4)
FAIL_EXIT1 ("invalid QNAME: %s\n", qname);
TEST_COMPARE_STRING (tail, "example");
free (tail);
if (an < 0 || ns < 0 || ar < 0)
{
struct resolv_response_flags flags = { .rcode = NXDOMAIN, };
resolv_response_init (b, flags);
resolv_response_add_question (b, qname, qclass, qtype);
return;
}
struct resolv_response_flags flags = {};
resolv_response_init (b, flags);
resolv_response_add_question (b, qname, qclass, qtype);
resolv_response_section (b, ns_s_an);
for (int i = 0; i < an; ++i)
{
resolv_response_open_record (b, qname, qclass, qtype, 60);
switch (qtype)
{
case T_A:
{
char ipv4[4] = {192, 0, 2, i + 1};
resolv_response_add_data (b, &ipv4, sizeof (ipv4));
}
break;
case T_PTR:
{
char *name = xasprintf ("ptr-%d", i);
resolv_response_add_name (b, name);
free (name);
}
break;
}
resolv_response_close_record (b);
}
resolv_response_section (b, ns_s_ns);
for (int i = 0; i < ns; ++i)
{
resolv_response_open_record (b, qname, qclass, T_NS, 60);
char *name = xasprintf ("ns%d.example.net", i);
resolv_response_add_name (b, name);
free (name);
resolv_response_close_record (b);
}
resolv_response_section (b, ns_s_ar);
int addr = 1;
for (int i = 0; i < ns; ++i)
{
char *name = xasprintf ("ns%d.example.net", i);
for (int j = 0; j < ar; ++j)
{
resolv_response_open_record (b, name, qclass, T_A, 60);
char ipv4[4] = {192, 0, 2, addr};
resolv_response_add_data (b, &ipv4, sizeof (ipv4));
resolv_response_close_record (b);
resolv_response_open_record (b, name, qclass, T_AAAA, 60);
char ipv6[16]
= {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, addr};
resolv_response_add_data (b, &ipv6, sizeof (ipv6));
resolv_response_close_record (b);
++addr;
}
free (name);
}
}
/* Number of modes. Lowest bit encodes *n* function vs implicit _res
argument. The mode numbers themselves are arbitrary. */
enum { mode_count = 8 };
/* res_send-like modes do not perform error translation. */
enum { first_send_mode = 6 };
static int
libresolv_query (unsigned int mode, const char *qname, uint16_t qtype,
unsigned char *buf, size_t buflen)
{
int saved_errno = errno;
TEST_VERIFY_EXIT (mode < mode_count);
switch (mode)
{
case 0:
return res_query (qname, C_IN, qtype, buf, buflen);
case 1:
return res_nquery (&_res, qname, C_IN, qtype, buf, buflen);
case 2:
return res_search (qname, C_IN, qtype, buf, buflen);
case 3:
return res_nsearch (&_res, qname, C_IN, qtype, buf, buflen);
case 4:
return res_querydomain (qname, "", C_IN, qtype, buf, buflen);
case 5:
return res_nquerydomain (&_res, qname, "", C_IN, qtype, buf, buflen);
case 6:
{
unsigned char querybuf[512];
int ret = res_mkquery (QUERY, qname, C_IN, qtype,
NULL, 0, NULL, querybuf, sizeof (querybuf));
TEST_VERIFY_EXIT (ret > 0);
errno = saved_errno;
return res_send (querybuf, ret, buf, buflen);
}
case 7:
{
unsigned char querybuf[512];
int ret = res_nmkquery (&_res, QUERY, qname, C_IN, qtype,
NULL, 0, NULL, querybuf, sizeof (querybuf));
TEST_VERIFY_EXIT (ret > 0);
errno = saved_errno;
return res_nsend (&_res, querybuf, ret, buf, buflen);
}
}
__builtin_unreachable ();
}
static int
do_test (void)
{
struct resolv_test *obj = resolv_test_start
((struct resolv_redirect_config)
{
.response_callback = response
});
_res.options |= RES_NOAAAA;
check_hostent ("an1.ns2.ar1.example",
gethostbyname ("an1.ns2.ar1.example"),
"name: an1.ns2.ar1.example\n"
"address: 192.0.2.1\n");
queries = 0;
check_hostent ("an0.ns2.ar1.example",
gethostbyname ("an0.ns2.ar1.example"),
"error: NO_ADDRESS\n");
queries = 0;
check_hostent ("an-1.ns2.ar1.example",
gethostbyname ("an-1.ns2.ar1.example"),
"error: HOST_NOT_FOUND\n");
queries = 0;
check_hostent ("an1.ns2.ar1.example AF_INET",
gethostbyname2 ("an1.ns2.ar1.example", AF_INET),
"name: an1.ns2.ar1.example\n"
"address: 192.0.2.1\n");
queries = 0;
check_hostent ("an0.ns2.ar1.example AF_INET",
gethostbyname2 ("an0.ns2.ar1.example", AF_INET),
"error: NO_ADDRESS\n");
queries = 0;
check_hostent ("an-1.ns2.ar1.example AF_INET",
gethostbyname2 ("an-1.ns2.ar1.example", AF_INET),
"error: HOST_NOT_FOUND\n");
queries = 0;
check_hostent ("an1.ns2.ar1.example AF_INET6",
gethostbyname2 ("an1.ns2.ar1.example", AF_INET6),
"error: NO_ADDRESS\n");
queries = 0;
check_hostent ("an0.ns2.ar1.example AF_INET6",
gethostbyname2 ("an0.ns2.ar1.example", AF_INET6),
"error: NO_ADDRESS\n");
queries = 0;
check_hostent ("an-1.ns2.ar1.example AF_INET6",
gethostbyname2 ("an-1.ns2.ar1.example", AF_INET6),
"error: HOST_NOT_FOUND\n");
queries = 0;
/* Multiple addresses. */
check_hostent ("an2.ns0.ar0.example",
gethostbyname ("an2.ns0.ar0.example"),
"name: an2.ns0.ar0.example\n"
"address: 192.0.2.1\n"
"address: 192.0.2.2\n");
queries = 0;
check_hostent ("an2.ns0.ar0.example AF_INET6",
gethostbyname2 ("an2.ns0.ar0.example", AF_INET6),
"error: NO_ADDRESS\n");
queries = 0;
/* getaddrinfo checks with one address. */
struct addrinfo *ai;
int ret;
ret = getaddrinfo ("an1.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_INET,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an1.ns2.ar1.example (AF_INET)", ai, ret,
"address: STREAM/TCP 192.0.2.1 80\n");
freeaddrinfo (ai);
queries = 0;
ret = getaddrinfo ("an1.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_INET6,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an1.ns2.ar1.example (AF_INET6)", ai, ret,
"error: No address associated with hostname\n");
queries = 0;
ret = getaddrinfo ("an1.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an1.ns2.ar1.example (AF_UNSPEC)", ai, ret,
"address: STREAM/TCP 192.0.2.1 80\n");
freeaddrinfo (ai);
queries = 0;
/* getaddrinfo checks with three addresses. */
ret = getaddrinfo ("an3.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_INET,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an3.ns2.ar1.example (AF_INET)", ai, ret,
"address: STREAM/TCP 192.0.2.1 80\n"
"address: STREAM/TCP 192.0.2.2 80\n"
"address: STREAM/TCP 192.0.2.3 80\n");
freeaddrinfo (ai);
queries = 0;
ret = getaddrinfo ("an3.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_INET6,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an3.ns2.ar1.example (AF_INET6)", ai, ret,
"error: No address associated with hostname\n");
queries = 0;
ret = getaddrinfo ("an3.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an3.ns2.ar1.example (AF_UNSPEC)", ai, ret,
"address: STREAM/TCP 192.0.2.1 80\n"
"address: STREAM/TCP 192.0.2.2 80\n"
"address: STREAM/TCP 192.0.2.3 80\n");
freeaddrinfo (ai);
queries = 0;
/* getaddrinfo checks with no address. */
ret = getaddrinfo ("an0.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_INET,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an0.ns2.ar1.example (AF_INET)", ai, ret,
"error: No address associated with hostname\n");
queries = 0;
ret = getaddrinfo ("an0.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_INET6,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an0.ns2.ar1.example (AF_INET6)", ai, ret,
"error: No address associated with hostname\n");
queries = 0;
ret = getaddrinfo ("an0.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an-1.ns2.ar1.example (AF_UNSPEC)", ai, ret,
"error: No address associated with hostname\n");
queries = 0;
/* getaddrinfo checks with NXDOMAIN. */
ret = getaddrinfo ("an-1.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_INET,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an-1.ns2.ar1.example (AF_INET)", ai, ret,
"error: Name or service not known\n");
queries = 0;
ret = getaddrinfo ("an-1.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_INET6,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an-1.ns2.ar1.example (AF_INET6)", ai, ret,
"error: Name or service not known\n");
queries = 0;
ret = getaddrinfo ("an-1.ns2.ar1.example", "80",
&(struct addrinfo)
{
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
}, &ai);
check_addrinfo ("an-1.ns2.ar1.example (AF_UNSPEC)", ai, ret,
"error: Name or service not known\n");
queries = 0;
for (unsigned int mode = 0; mode < mode_count; ++mode)
{
unsigned char *buf;
int ret;
/* Response for A. */
buf = malloc (512);
ret = libresolv_query (mode, "an1.ns2.ar1.example", T_A, buf, 512);
TEST_VERIFY_EXIT (ret > 0);
check_dns_packet ("an1.ns2.ar1.example A", buf, ret,
"name: an1.ns2.ar1.example\n"
"address: 192.0.2.1\n");
free (buf);
queries = 0;
/* NODATA response for A. */
buf = malloc (512);
errno = 0;
ret = libresolv_query (mode, "an0.ns2.ar1.example", T_A, buf, 512);
if (mode < first_send_mode)
{
TEST_COMPARE (ret, -1);
TEST_COMPARE (errno, 0);
TEST_COMPARE (h_errno, NO_ADDRESS);
}
else
{
TEST_VERIFY_EXIT (ret > 0);
TEST_COMPARE (((HEADER *)buf)->rcode, 0);
check_dns_packet ("an1.ns2.ar1.example A", buf, ret,
"name: an0.ns2.ar1.example\n");
}
free (buf);
queries = 0;
/* NXDOMAIN response for A. */
buf = malloc (512);
errno = 0;
ret = libresolv_query (mode, "an-1.ns2.ar1.example", T_A, buf, 512);
if (mode < first_send_mode)
{
TEST_COMPARE (ret, -1);
TEST_COMPARE (errno, 0);
TEST_COMPARE (h_errno, HOST_NOT_FOUND);
}
else
{
TEST_VERIFY_EXIT (ret > 0);
TEST_COMPARE (((HEADER *)buf)->rcode, NXDOMAIN);
check_dns_packet ("an1.ns2.ar1.example A", buf, ret,
"name: an-1.ns2.ar1.example\n");
}
free (buf);
queries = 0;
/* Response for PTR. */
buf = malloc (512);
ret = libresolv_query (mode, "an1.ns2.ar1.example", T_PTR, buf, 512);
TEST_VERIFY_EXIT (ret > 0);
check_dns_packet ("an1.ns2.ar1.example PTR", buf, ret,
"name: an1.ns2.ar1.example\n"
"data: an1.ns2.ar1.example PTR ptr-0\n");
free (buf);
queries = 0;
/* NODATA response for PTR. */
buf = malloc (512);
errno = 0;
ret = libresolv_query (mode, "an0.ns2.ar1.example", T_PTR, buf, 512);
if (mode < first_send_mode)
{
TEST_COMPARE (ret, -1);
TEST_COMPARE (errno, 0);
TEST_COMPARE (h_errno, NO_ADDRESS);
}
else
{
TEST_VERIFY_EXIT (ret > 0);
TEST_COMPARE (((HEADER *)buf)->rcode, 0);
check_dns_packet ("an1.ns2.ar1.example PTR", buf, ret,
"name: an0.ns2.ar1.example\n");
}
free (buf);
queries = 0;
/* NXDOMAIN response for PTR. */
buf = malloc (512);
errno = 0;
ret = libresolv_query (mode, "an-1.ns2.ar1.example", T_PTR, buf, 512);
if (mode < first_send_mode)
{
TEST_COMPARE (ret, -1);
TEST_COMPARE (errno, 0);
TEST_COMPARE (h_errno, HOST_NOT_FOUND);
}
else
{
TEST_VERIFY_EXIT (ret > 0);
TEST_COMPARE (((HEADER *)buf)->rcode, NXDOMAIN);
check_dns_packet ("an1.ns2.ar1.example PTR", buf, ret,
"name: an-1.ns2.ar1.example\n");
}
free (buf);
queries = 0;
/* NODATA response for AAAA. */
buf = malloc (512);
errno = 0;
ret = libresolv_query (mode, "an1.ns2.ar1.example", T_AAAA, buf, 512);
if (mode < first_send_mode)
{
TEST_COMPARE (ret, -1);
TEST_COMPARE (errno, 0);
TEST_COMPARE (h_errno, NO_ADDRESS);
}
else
{
TEST_VERIFY_EXIT (ret > 0);
TEST_COMPARE (((HEADER *)buf)->rcode, 0);
check_dns_packet ("an1.ns2.ar1.example A", buf, ret,
"name: an1.ns2.ar1.example\n");
}
free (buf);
queries = 0;
/* NODATA response for AAAA (original is already NODATA). */
buf = malloc (512);
errno = 0;
ret = libresolv_query (mode, "an0.ns2.ar1.example", T_AAAA, buf, 512);
if (mode < first_send_mode)
{
TEST_COMPARE (ret, -1);
TEST_COMPARE (errno, 0);
TEST_COMPARE (h_errno, NO_ADDRESS);
}
else
{
TEST_VERIFY_EXIT (ret > 0);
TEST_COMPARE (((HEADER *)buf)->rcode, 0);
check_dns_packet ("an0.ns2.ar1.example A", buf, ret,
"name: an0.ns2.ar1.example\n");
}
free (buf);
queries = 0;
/* NXDOMAIN response. */
buf = malloc (512);
errno = 0;
ret = libresolv_query (mode, "an-1.ns2.ar1.example", T_AAAA, buf, 512);
if (mode < first_send_mode)
{
TEST_COMPARE (ret, -1);
TEST_COMPARE (errno, 0);
TEST_COMPARE (h_errno, HOST_NOT_FOUND);
}
else
{
TEST_VERIFY_EXIT (ret > 0);
TEST_COMPARE (((HEADER *)buf)->rcode, NXDOMAIN);
check_dns_packet ("an-1.ns2.ar1.example A", buf, ret,
"name: an-1.ns2.ar1.example\n");
}
free (buf);
queries = 0;
}
resolv_test_end (obj);
return 0;
}
#include <support/test-driver.c>
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