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/* Test search/default domain name behavior.
Copyright (C) 2016-2020 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 <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/check_nss.h>
#include <support/resolv_test.h>
#include <support/support.h>
#include <support/xmemstream.h>
struct item
{
const char *name;
int response;
};
const struct item items[] =
{
{"hostname.usersys.example.com", 1},
{"hostname.corp.example.com", 1},
{"hostname.example.com", 1},
{"mail.corp.example.com", 1},
{"mail.example.com", 1},
{"file.corp.example.com", 2},
{"file.corp", 1},
{"file.example.com", 1},
{"servfail-usersys.usersys.example.com", -ns_r_servfail},
{"servfail-usersys.corp.example.com", 1},
{"servfail-usersys.example.com", 1},
{"servfail-corp.usersys.example.com", 1},
{"servfail-corp.corp.example.com", -ns_r_servfail},
{"servfail-corp.example.com", 1},
{"www.example.com", 1},
{"large.example.com", 200},
/* Test query amplification with a SERVFAIL response combined with
a large RRset. */
{"large-servfail.usersys.example.com", -ns_r_servfail},
{"large-servfail.example.com", 2000},
{}
};
enum
{
name_not_found = -1,
name_no_data = -2
};
static int
find_name (const char *name)
{
for (int i = 0; items[i].name != NULL; ++i)
{
if (strcmp (name, items[i].name) == 0)
return i;
}
if (strcmp (name, "example.com") == 0
|| strcmp (name, "usersys.example.com") == 0
|| strcmp (name, "corp.example.com") == 0)
return name_no_data;
return name_not_found;
}
static int rcode_override_server_index = -1;
static int rcode_override;
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 == rcode_override_server_index)
{
struct resolv_response_flags flags = {.rcode = rcode_override};
resolv_response_init (b, flags);
resolv_response_add_question (b, qname, qclass, qtype);
return;
}
int index = find_name (qname);
struct resolv_response_flags flags = {};
if (index == name_not_found)
flags.rcode = ns_r_nxdomain;
else if (index >= 0 && items[index].response < 0)
flags.rcode = -items[index].response;
else if (index >= 0 && items[index].response > 5 && !ctx->tcp)
/* Force TCP if more than 5 addresses where requested. */
flags.tc = true;
resolv_response_init (b, flags);
resolv_response_add_question (b, qname, qclass, qtype);
if (flags.tc || index < 0 || items[index].response < 0)
return;
resolv_response_section (b, ns_s_an);
for (int i = 0; i < items[index].response; ++i)
{
resolv_response_open_record (b, qname, qclass, qtype, 0);
switch (qtype)
{
case T_A:
{
char addr[4] = {10, index, i >> 8, i};
resolv_response_add_data (b, addr, sizeof (addr));
}
break;
case T_AAAA:
{
char addr[16]
= {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0,
0, index + 1, (i + 1) >> 8, i + 1};
resolv_response_add_data (b, addr, sizeof (addr));
}
break;
default:
support_record_failure ();
printf ("error: unexpected QTYPE: %s/%u/%u\n",
qname, qclass, qtype);
}
resolv_response_close_record (b);
}
}
enum output_format
{
format_get, format_gai
};
static void
format_expected_1 (FILE *out, int family, enum output_format format, int index)
{
for (int i = 0; i < items[index].response; ++i)
{
char address[200];
switch (family)
{
case AF_INET:
snprintf (address, sizeof (address), "10.%d.%d.%d",
index, (i >> 8) & 0xff, i & 0xff);
break;
case AF_INET6:
snprintf (address, sizeof (address), "2001:db8::%x:%x",
index + 1, i + 1);
break;
default:
FAIL_EXIT1 ("unreachable");
}
switch (format)
{
case format_get:
fprintf (out, "address: %s\n", address);
break;
case format_gai:
fprintf (out, "address: STREAM/TCP %s 80\n", address);
}
}
}
static char *
format_expected (const char *fqdn, int family, enum output_format format)
{
int index = find_name (fqdn);
TEST_VERIFY_EXIT (index >= 0);
struct xmemstream stream;
xopen_memstream (&stream);
TEST_VERIFY_EXIT (items[index].response >= 0);
if (format == format_get)
fprintf (stream.out, "name: %s\n", items[index].name);
if (family == AF_INET || family == AF_UNSPEC)
format_expected_1 (stream.out, AF_INET, format, index);
if (family == AF_INET6 || family == AF_UNSPEC)
format_expected_1 (stream.out, AF_INET6, format, index);
xfclose_memstream (&stream);
return stream.buffer;
}
static void
do_get (const char *name, const char *fqdn, int family)
{
char *expected = format_expected (fqdn, family, format_get);
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);
/* Test res_search. */
int qtype;
switch (family)
{
case AF_INET:
qtype = T_A;
break;
case AF_INET6:
qtype = T_AAAA;
break;
default:
qtype = -1;
}
if (qtype >= 0)
{
int sz = 512;
unsigned char *response = xmalloc (sz);
int ret = res_search (name, C_IN, qtype, response, sz);
TEST_VERIFY_EXIT (ret >= 0);
if (ret > sz)
{
/* Truncation. Retry with a larger buffer. */
sz = 65535;
unsigned char *newptr = xrealloc (response, sz);
response = newptr;
ret = res_search (name, C_IN, qtype, response, sz);
TEST_VERIFY_EXIT (ret >= 0);
TEST_VERIFY_EXIT (ret < sz);
}
check_dns_packet (query, response, ret, expected);
free (response);
}
free (query);
free (expected);
}
static void
do_gai (const char *name, const char *fqdn, int family)
{
struct addrinfo hints =
{
.ai_family = family,
.ai_protocol = IPPROTO_TCP,
.ai_socktype = SOCK_STREAM
};
struct addrinfo *ai;
char *query = xasprintf ("%s:80 [%d]", name, family);
int ret = getaddrinfo (name, "80", &hints, &ai);
char *expected = format_expected (fqdn, family, format_gai);
check_addrinfo (query, ai, ret, expected);
if (ret == 0)
freeaddrinfo (ai);
free (expected);
free (query);
}
static void
do_both (const char *name, const char *fqdn)
{
do_get (name, fqdn, AF_INET);
do_get (name, fqdn, AF_INET6);
do_gai (name, fqdn, AF_INET);
do_gai (name, fqdn, AF_INET6);
do_gai (name, fqdn, AF_UNSPEC);
}
static void
do_test_all (bool unconnectable_server)
{
struct resolv_redirect_config config =
{
.response_callback = response,
.search = {"usersys.example.com", "corp.example.com", "example.com"},
};
struct resolv_test *obj = resolv_test_start (config);
if (unconnectable_server)
{
/* 255.255.255.255 results in an immediate connect failure. The
next server will supply the answer instead. This is a
triggering condition for bug 19791. */
_res.nsaddr_list[0].sin_addr.s_addr = -1;
_res.nsaddr_list[0].sin_port = htons (53);
}
do_both ("file", "file.corp.example.com");
do_both ("www", "www.example.com");
do_both ("servfail-usersys", "servfail-usersys.corp.example.com");
do_both ("servfail-corp", "servfail-corp.usersys.example.com");
do_both ("large", "large.example.com");
do_both ("large-servfail", "large-servfail.example.com");
do_both ("file.corp", "file.corp");
/* Check that SERVFAIL and REFUSED responses do not alter the search
path resolution. */
rcode_override_server_index = 0;
rcode_override = ns_r_servfail;
do_both ("hostname", "hostname.usersys.example.com");
do_both ("large", "large.example.com");
do_both ("large-servfail", "large-servfail.example.com");
rcode_override = ns_r_refused;
do_both ("hostname", "hostname.usersys.example.com");
do_both ("large", "large.example.com");
do_both ("large-servfail", "large-servfail.example.com");
/* Likewise, but with an NXDOMAIN for the first search path
entry. */
rcode_override = ns_r_servfail;
do_both ("mail", "mail.corp.example.com");
rcode_override = ns_r_refused;
do_both ("mail", "mail.corp.example.com");
/* Likewise, but with ndots handling. */
rcode_override = ns_r_servfail;
do_both ("file.corp", "file.corp");
rcode_override = ns_r_refused;
do_both ("file.corp", "file.corp");
resolv_test_end (obj);
}
static int
do_test (void)
{
for (int unconnectable_server = 0; unconnectable_server < 2;
++unconnectable_server)
do_test_all (unconnectable_server);
return 0;
}
#include <support/test-driver.c>
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