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glibc/resolv/tst-resolv-basic.c

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/* Test basic nss_dns functionality and the resolver test harness itself.
Copyright (C) 2016-2024 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/check_nss.h>
#include <support/format_nss.h>
#include <support/resolv_test.h>
#include <support/support.h>
#define LONG_NAME \
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaax." \
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaay." \
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaz." \
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaat"
static void
response (const struct resolv_response_context *ctx,
struct resolv_response_builder *b,
const char *qname, uint16_t qclass, uint16_t qtype)
{
TEST_VERIFY_EXIT (qname != NULL);
/* The "t." prefix can be used to request TCP fallback. */
bool force_tcp;
if (strncmp ("t.", qname, 2) == 0)
force_tcp = true;
else
force_tcp = false;
const char *qname_compare;
if (force_tcp)
qname_compare = qname + 2;
else
qname_compare = qname;
enum {www, alias, nxdomain, long_name, nodata} requested_qname;
if (strcmp (qname_compare, "www.example") == 0)
requested_qname = www;
else if (strcmp (qname_compare, "alias.example") == 0)
requested_qname = alias;
else if (strcmp (qname_compare, "nxdomain.example") == 0)
requested_qname = nxdomain;
else if (strcmp (qname_compare, LONG_NAME) == 0)
requested_qname = long_name;
else if (strcmp (qname_compare, "nodata.example") == 0)
requested_qname = nodata;
else
{
support_record_failure ();
printf ("error: unexpected QNAME: %s\n", qname);
return;
}
TEST_VERIFY_EXIT (qclass == C_IN);
struct resolv_response_flags flags = {.tc = force_tcp && !ctx->tcp};
if (requested_qname == nxdomain)
flags.rcode = 3; /* NXDOMAIN */
resolv_response_init (b, flags);
resolv_response_add_question (b, qname, qclass, qtype);
if (requested_qname == nxdomain || flags.tc)
return;
resolv_response_section (b, ns_s_an);
switch (requested_qname)
{
case www:
case long_name:
resolv_response_open_record (b, qname, qclass, qtype, 0);
break;
case alias:
resolv_response_open_record (b, qname, qclass, T_CNAME, 0);
resolv_response_add_name (b, "www.example");
resolv_response_close_record (b);
resolv_response_open_record (b, "www.example", qclass, qtype, 0);
break;
case nodata:
return;
case nxdomain:
FAIL_EXIT1 ("unreachable");
}
switch (qtype)
{
case T_A:
{
char ipv4[4] = {192, 0, 2, 17};
ipv4[3] += requested_qname + 2 * ctx->tcp + 4 * ctx->server_index;
resolv_response_add_data (b, &ipv4, sizeof (ipv4));
}
break;
case T_AAAA:
{
char ipv6[16]
= {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
ipv6[15] += requested_qname + 2 * ctx->tcp + 4 * ctx->server_index;
resolv_response_add_data (b, &ipv6, sizeof (ipv6));
}
break;
default:
support_record_failure ();
printf ("error: unexpected QTYPE: %s/%u/%u\n",
qname, qclass, qtype);
}
resolv_response_close_record (b);
}
static void
check_h (const char *name, int family, const char *expected)
{
if (family == AF_INET)
{
char *query = xasprintf ("gethostbyname (\"%s\")", name);
check_hostent (query, gethostbyname (name), expected);
free (query);
}
{
char *query = xasprintf ("gethostbyname2 (\"%s\", %d)", name, family);
check_hostent (query, gethostbyname2 (name, family), expected);
free (query);
}
bool too_small = true;
for (unsigned int offset = 0; offset < 8; ++offset)
for (unsigned int size = 1; too_small; ++size)
{
char *buf = xmalloc (offset + size);
too_small = false;
struct hostent hostbuf;
struct hostent *result;
int herror;
if (family == AF_INET)
{
char *query = xasprintf ("gethostbyname (\"%s\") %u/%u",
name, offset, size);
int ret = gethostbyname_r
(name, &hostbuf, buf + offset, size, &result, &herror);
if (ret == 0)
{
h_errno = herror;
check_hostent (query, result, expected);
}
else if (ret == ERANGE)
too_small = true;
else
{
errno = ret;
FAIL_EXIT1 ("gethostbyname_r: %m");
}
free (query);
memset (buf, 0, offset + size);
}
char *query = xasprintf ("gethostbyname2 (\"%s\", %d) %u/%u",
name, family, offset, size);
int ret = gethostbyname2_r
(name, family, &hostbuf, buf + offset, size, &result, &herror);
if (ret == 0)
{
h_errno = herror;
check_hostent (query, result, expected);
}
else if (ret == ERANGE)
too_small = true;
else
{
errno = ret;
FAIL_EXIT1 ("gethostbyname_r: %m");
}
free (buf);
free (query);
}
}
static void
check_ai_hints (const char *name, const char *service,
struct addrinfo hints, const char *expected)
{
struct addrinfo *ai;
char *query = xasprintf ("%s:%s [%d]/0x%x", name, service,
hints.ai_family, hints.ai_flags);
int ret = getaddrinfo (name, service, &hints, &ai);
check_addrinfo (query, ai, ret, expected);
if (ret == 0)
freeaddrinfo (ai);
free (query);
}
static void
check_ai (const char *name, const char *service,
int family, const char *expected)
{
return check_ai_hints (name, service,
(struct addrinfo) { .ai_family = family, },
expected);
}
/* Test for bug 21295: getaddrinfo used to discard address information
instead of merging it. */
static void
test_bug_21295 (void)
{
/* The address order is unpredictable. There are two factors which
contribute to that: The stub resolver does not perform proper
response matching for A/AAAA queries (an A response could be
associated with an AAAA query and vice versa), and without
namespaces, system configuration could affect address
ordering. */
for (int do_tcp = 0; do_tcp < 2; ++do_tcp)
{
const struct addrinfo hints =
{
.ai_family = AF_INET6,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_V4MAPPED | AI_ALL,
};
const char *qname;
if (do_tcp)
qname = "t.www.example";
else
qname = "www.example";
struct addrinfo *ai = NULL;
int ret = getaddrinfo (qname, "80", &hints, &ai);
TEST_VERIFY_EXIT (ret == 0);
const char *expected_a;
const char *expected_b;
if (do_tcp)
{
expected_a = "flags: AI_V4MAPPED AI_ALL\n"
"address: STREAM/TCP 2001:db8::3 80\n"
"address: STREAM/TCP ::ffff:192.0.2.19 80\n";
expected_b = "flags: AI_V4MAPPED AI_ALL\n"
"address: STREAM/TCP ::ffff:192.0.2.19 80\n"
"address: STREAM/TCP 2001:db8::3 80\n";
}
else
{
expected_a = "flags: AI_V4MAPPED AI_ALL\n"
"address: STREAM/TCP 2001:db8::1 80\n"
"address: STREAM/TCP ::ffff:192.0.2.17 80\n";
expected_b = "flags: AI_V4MAPPED AI_ALL\n"
"address: STREAM/TCP ::ffff:192.0.2.17 80\n"
"address: STREAM/TCP 2001:db8::1 80\n";
}
char *actual = support_format_addrinfo (ai, ret);
if (!(strcmp (actual, expected_a) == 0
|| strcmp (actual, expected_b) == 0))
{
support_record_failure ();
printf ("error: %s: unexpected response (TCP: %d):\n%s\n",
__func__, do_tcp, actual);
}
free (actual);
freeaddrinfo (ai);
}
}
/* Run tests which do not expect any data. */
static void
test_nodata_nxdomain (void)
{
/* Iterate through different address families. */
int families[] = { AF_UNSPEC, AF_INET, AF_INET6, -1 };
for (int i = 0; families[i] >= 0; ++i)
/* If do_tcp, prepend "t." to the name to trigger TCP
fallback. */
for (int do_tcp = 0; do_tcp < 2; ++do_tcp)
/* If do_nxdomain, trigger an NXDOMAIN error (DNS failure),
otherwise use a NODATA response (empty but successful
answer). */
for (int do_nxdomain = 0; do_nxdomain < 2; ++do_nxdomain)
{
int family = families[i];
char *name = xasprintf ("%s%s.example",
do_tcp ? "t." : "",
do_nxdomain ? "nxdomain" : "nodata");
if (family != AF_UNSPEC)
{
if (do_nxdomain)
check_h (name, family, "error: HOST_NOT_FOUND\n");
else
check_h (name, family, "error: NO_ADDRESS\n");
}
const char *expected;
if (do_nxdomain)
expected = "error: Name or service not known\n";
else
expected = "error: No address associated with hostname\n";
check_ai (name, "80", family, expected);
struct addrinfo hints =
{
.ai_family = family,
.ai_flags = AI_V4MAPPED | AI_ALL,
};
check_ai_hints (name, "80", hints, expected);
hints.ai_flags |= AI_CANONNAME;
check_ai_hints (name, "80", hints, expected);
free (name);
}
}
static int
do_test (void)
{
struct resolv_test *aux = resolv_test_start
((struct resolv_redirect_config)
{
.response_callback = response,
});
check_h ("www.example", AF_INET,
"name: www.example\n"
"address: 192.0.2.17\n");
check_h ("alias.example", AF_INET,
"name: www.example\n"
"alias: alias.example\n"
"address: 192.0.2.18\n");
check_h ("www.example", AF_INET6,
"name: www.example\n"
"address: 2001:db8::1\n");
check_h ("alias.example", AF_INET6,
"name: www.example\n"
"alias: alias.example\n"
"address: 2001:db8::2\n");
check_h (LONG_NAME, AF_INET,
"name: " LONG_NAME "\n"
"address: 192.0.2.20\n");
check_ai ("www.example", "80", AF_UNSPEC,
"address: STREAM/TCP 192.0.2.17 80\n"
"address: DGRAM/UDP 192.0.2.17 80\n"
"address: RAW/IP 192.0.2.17 80\n"
"address: STREAM/TCP 2001:db8::1 80\n"
"address: DGRAM/UDP 2001:db8::1 80\n"
"address: RAW/IP 2001:db8::1 80\n");
check_ai_hints ("www.example", "80",
(struct addrinfo) { .ai_family = AF_UNSPEC,
.ai_flags = AI_CANONNAME, },
"flags: AI_CANONNAME\n"
"canonname: www.example\n"
"address: STREAM/TCP 192.0.2.17 80\n"
"address: DGRAM/UDP 192.0.2.17 80\n"
"address: RAW/IP 192.0.2.17 80\n"
"address: STREAM/TCP 2001:db8::1 80\n"
"address: DGRAM/UDP 2001:db8::1 80\n"
"address: RAW/IP 2001:db8::1 80\n");
check_ai ("alias.example", "80", AF_UNSPEC,
"address: STREAM/TCP 192.0.2.18 80\n"
"address: DGRAM/UDP 192.0.2.18 80\n"
"address: RAW/IP 192.0.2.18 80\n"
"address: STREAM/TCP 2001:db8::2 80\n"
"address: DGRAM/UDP 2001:db8::2 80\n"
"address: RAW/IP 2001:db8::2 80\n");
check_ai_hints ("alias.example", "80",
(struct addrinfo) { .ai_family = AF_UNSPEC,
.ai_flags = AI_CANONNAME, },
"flags: AI_CANONNAME\n"
"canonname: www.example\n"
"address: STREAM/TCP 192.0.2.18 80\n"
"address: DGRAM/UDP 192.0.2.18 80\n"
"address: RAW/IP 192.0.2.18 80\n"
"address: STREAM/TCP 2001:db8::2 80\n"
"address: DGRAM/UDP 2001:db8::2 80\n"
"address: RAW/IP 2001:db8::2 80\n");
check_ai (LONG_NAME, "80", AF_UNSPEC,
"address: STREAM/TCP 192.0.2.20 80\n"
"address: DGRAM/UDP 192.0.2.20 80\n"
"address: RAW/IP 192.0.2.20 80\n"
"address: STREAM/TCP 2001:db8::4 80\n"
"address: DGRAM/UDP 2001:db8::4 80\n"
"address: RAW/IP 2001:db8::4 80\n");
check_ai ("www.example", "80", AF_INET,
"address: STREAM/TCP 192.0.2.17 80\n"
"address: DGRAM/UDP 192.0.2.17 80\n"
"address: RAW/IP 192.0.2.17 80\n");
check_ai_hints ("www.example", "80",
(struct addrinfo) { .ai_family = AF_INET,
.ai_flags = AI_CANONNAME, },
"flags: AI_CANONNAME\n"
"canonname: www.example\n"
"address: STREAM/TCP 192.0.2.17 80\n"
"address: DGRAM/UDP 192.0.2.17 80\n"
"address: RAW/IP 192.0.2.17 80\n");
check_ai ("alias.example", "80", AF_INET,
"address: STREAM/TCP 192.0.2.18 80\n"
"address: DGRAM/UDP 192.0.2.18 80\n"
"address: RAW/IP 192.0.2.18 80\n");
check_ai_hints ("alias.example", "80",
(struct addrinfo) { .ai_family = AF_INET,
.ai_flags = AI_CANONNAME, },
"flags: AI_CANONNAME\n"
"canonname: www.example\n"
"address: STREAM/TCP 192.0.2.18 80\n"
"address: DGRAM/UDP 192.0.2.18 80\n"
"address: RAW/IP 192.0.2.18 80\n");
check_ai (LONG_NAME, "80", AF_INET,
"address: STREAM/TCP 192.0.2.20 80\n"
"address: DGRAM/UDP 192.0.2.20 80\n"
"address: RAW/IP 192.0.2.20 80\n");
check_ai ("www.example", "80", AF_INET6,
"address: STREAM/TCP 2001:db8::1 80\n"
"address: DGRAM/UDP 2001:db8::1 80\n"
"address: RAW/IP 2001:db8::1 80\n");
check_ai_hints ("www.example", "80",
(struct addrinfo) { .ai_family = AF_INET6,
.ai_flags = AI_CANONNAME, },
"flags: AI_CANONNAME\n"
"canonname: www.example\n"
"address: STREAM/TCP 2001:db8::1 80\n"
"address: DGRAM/UDP 2001:db8::1 80\n"
"address: RAW/IP 2001:db8::1 80\n");
check_ai ("alias.example", "80", AF_INET6,
"address: STREAM/TCP 2001:db8::2 80\n"
"address: DGRAM/UDP 2001:db8::2 80\n"
"address: RAW/IP 2001:db8::2 80\n");
check_ai_hints ("alias.example", "80",
(struct addrinfo) { .ai_family = AF_INET6,
.ai_flags = AI_CANONNAME, },
"flags: AI_CANONNAME\n"
"canonname: www.example\n"
"address: STREAM/TCP 2001:db8::2 80\n"
"address: DGRAM/UDP 2001:db8::2 80\n"
"address: RAW/IP 2001:db8::2 80\n");
check_ai (LONG_NAME, "80", AF_INET6,
"address: STREAM/TCP 2001:db8::4 80\n"
"address: DGRAM/UDP 2001:db8::4 80\n"
"address: RAW/IP 2001:db8::4 80\n");
check_h ("t.www.example", AF_INET,
"name: t.www.example\n"
"address: 192.0.2.19\n");
check_h ("t.alias.example", AF_INET,
"name: www.example\n"
"alias: t.alias.example\n"
"address: 192.0.2.20\n");
check_h ("t.www.example", AF_INET6,
"name: t.www.example\n"
"address: 2001:db8::3\n");
check_h ("t.alias.example", AF_INET6,
"name: www.example\n"
"alias: t.alias.example\n"
"address: 2001:db8::4\n");
check_ai ("t.www.example", "80", AF_UNSPEC,
"address: STREAM/TCP 192.0.2.19 80\n"
"address: DGRAM/UDP 192.0.2.19 80\n"
"address: RAW/IP 192.0.2.19 80\n"
"address: STREAM/TCP 2001:db8::3 80\n"
"address: DGRAM/UDP 2001:db8::3 80\n"
"address: RAW/IP 2001:db8::3 80\n");
check_ai ("t.alias.example", "80", AF_UNSPEC,
"address: STREAM/TCP 192.0.2.20 80\n"
"address: DGRAM/UDP 192.0.2.20 80\n"
"address: RAW/IP 192.0.2.20 80\n"
"address: STREAM/TCP 2001:db8::4 80\n"
"address: DGRAM/UDP 2001:db8::4 80\n"
"address: RAW/IP 2001:db8::4 80\n");
check_ai ("t.www.example", "80", AF_INET,
"address: STREAM/TCP 192.0.2.19 80\n"
"address: DGRAM/UDP 192.0.2.19 80\n"
"address: RAW/IP 192.0.2.19 80\n");
check_ai ("t.alias.example", "80", AF_INET,
"address: STREAM/TCP 192.0.2.20 80\n"
"address: DGRAM/UDP 192.0.2.20 80\n"
"address: RAW/IP 192.0.2.20 80\n");
check_ai ("t.www.example", "80", AF_INET6,
"address: STREAM/TCP 2001:db8::3 80\n"
"address: DGRAM/UDP 2001:db8::3 80\n"
"address: RAW/IP 2001:db8::3 80\n");
check_ai ("t.alias.example", "80", AF_INET6,
"address: STREAM/TCP 2001:db8::4 80\n"
"address: DGRAM/UDP 2001:db8::4 80\n"
"address: RAW/IP 2001:db8::4 80\n");
test_bug_21295 ();
test_nodata_nxdomain ();
resolv_test_end (aux);
return 0;
}
#include <support/test-driver.c>
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