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/* Test getnetbyname and getnetbyaddr.
Copyright (C) 2016-2018 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
<http://www.gnu.org/licenses/>. */
#include <netdb.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>
static void
send_ptr (struct resolv_response_builder *b,
const char *qname, uint16_t qclass, uint16_t qtype,
const char *alias)
{
resolv_response_init (b, (struct resolv_response_flags) {});
resolv_response_add_question (b, qname, qclass, qtype);
resolv_response_section (b, ns_s_an);
resolv_response_open_record (b, qname, qclass, T_PTR, 0);
resolv_response_add_name (b, alias);
resolv_response_close_record (b);
}
static void
handle_code (const struct resolv_response_context *ctx,
struct resolv_response_builder *b,
const char *qname, uint16_t qclass, uint16_t qtype,
int code)
{
switch (code)
{
case 1:
send_ptr (b, qname, qclass, qtype, "1.in-addr.arpa");
break;
case 2:
send_ptr (b, qname, qclass, qtype, "2.1.in-addr.arpa");
break;
case 3:
send_ptr (b, qname, qclass, qtype, "3.2.1.in-addr.arpa");
break;
case 4:
send_ptr (b, qname, qclass, qtype, "4.3.2.1.in-addr.arpa");
break;
case 5:
/* Test multiple PTR records. */
resolv_response_init (b, (struct resolv_response_flags) {});
resolv_response_add_question (b, qname, qclass, qtype);
resolv_response_section (b, ns_s_an);
resolv_response_open_record (b, qname, qclass, T_PTR, 0);
resolv_response_add_name (b, "127.in-addr.arpa");
resolv_response_close_record (b);
resolv_response_open_record (b, qname, qclass, T_PTR, 0);
resolv_response_add_name (b, "0.in-addr.arpa");
resolv_response_close_record (b);
break;
case 6:
/* Test skipping of RRSIG record. */
resolv_response_init (b, (struct resolv_response_flags) { });
resolv_response_add_question (b, qname, qclass, qtype);
resolv_response_section (b, ns_s_an);
resolv_response_open_record (b, qname, qclass, T_PTR, 0);
resolv_response_add_name (b, "127.in-addr.arpa");
resolv_response_close_record (b);
resolv_response_open_record (b, qname, qclass, 46 /* RRSIG */, 0);
{
char buf[500];
memset (buf, 0x3f, sizeof (buf));
resolv_response_add_data (b, buf, sizeof (buf));
}
resolv_response_close_record (b);
resolv_response_open_record (b, qname, qclass, T_PTR, 0);
resolv_response_add_name (b, "0.in-addr.arpa");
resolv_response_close_record (b);
break;
case 7:
/* Test CNAME handling. */
resolv_response_init (b, (struct resolv_response_flags) { });
resolv_response_add_question (b, qname, qclass, qtype);
resolv_response_section (b, ns_s_an);
resolv_response_open_record (b, qname, qclass, T_CNAME, 0);
resolv_response_add_name (b, "cname.example");
resolv_response_close_record (b);
resolv_response_open_record (b, "cname.example", qclass, T_PTR, 0);
resolv_response_add_name (b, "4.3.2.1.in-addr.arpa");
resolv_response_close_record (b);
break;
case 100:
resolv_response_init (b, (struct resolv_response_flags) { .rcode = 0, });
resolv_response_add_question (b, qname, qclass, qtype);
break;
case 101:
resolv_response_init (b, (struct resolv_response_flags)
{ .rcode = NXDOMAIN, });
resolv_response_add_question (b, qname, qclass, qtype);
break;
case 102:
resolv_response_init (b, (struct resolv_response_flags) {.rcode = SERVFAIL});
resolv_response_add_question (b, qname, qclass, qtype);
break;
case 103:
/* Check response length matching. */
if (!ctx->tcp)
{
resolv_response_init (b, (struct resolv_response_flags) {.tc = true});
resolv_response_add_question (b, qname, qclass, qtype);
}
else
{
resolv_response_init (b, (struct resolv_response_flags) {.ancount = 1});
resolv_response_add_question (b, qname, qclass, qtype);
resolv_response_section (b, ns_s_an);
resolv_response_open_record (b, qname, qclass, T_PTR, 0);
resolv_response_add_name (b, "127.in-addr.arpa");
resolv_response_close_record (b);
resolv_response_open_record (b, qname, qclass, T_PTR, 0);
resolv_response_add_name (b, "example");
resolv_response_close_record (b);
resolv_response_open_record (b, qname, qclass, T_PTR, 0);
size_t to_fill = 65535 - resolv_response_length (b)
- 2 /* length, "n" */ - 2 /* compression reference */
- 2 /* RR type */;
for (size_t i = 0; i < to_fill; ++i)
resolv_response_add_data (b, "", 1);
resolv_response_close_record (b);
resolv_response_add_name (b, "n.example");
uint16_t rrtype = htons (T_PTR);
resolv_response_add_data (b, &rrtype, sizeof (rrtype));
}
break;
case 104:
send_ptr (b, qname, qclass, qtype, "host.example");
break;
default:
FAIL_EXIT1 ("invalid QNAME: %s (code %d)", qname, code);
}
}
static void
response (const struct resolv_response_context *ctx,
struct resolv_response_builder *b,
const char *qname, uint16_t qclass, uint16_t qtype)
{
int code;
if (strstr (qname, "in-addr.arpa") == NULL)
{
char *tail;
if (sscanf (qname, "code%d.%ms", &code, &tail) != 2
|| strcmp (tail, "example") != 0)
FAIL_EXIT1 ("invalid QNAME: %s", qname);
free (tail);
handle_code (ctx, b, qname, qclass, qtype, code);
}
else
{
/* Reverse lookup. */
int components[4];
char *tail;
if (sscanf (qname, "%d.%d.%d.%d.%ms",
components, components + 1, components + 2, components + 3,
&tail) != 5
|| strcmp (tail, "in-addr.arpa") != 0)
FAIL_EXIT1 ("invalid QNAME: %s", qname);
free (tail);
handle_code (ctx, b, qname, qclass, qtype, components[3]);
}
}
static void
check_reverse (int code, const char *expected)
{
char *query = xasprintf ("code=%d", code);
check_netent (query, getnetbyaddr (code, AF_INET), expected);
free (query);
}
/* Test for CVE-2016-3075. */
static void
check_long_name (void)
{
struct xmemstream mem;
xopen_memstream (&mem);
char label[65];
memset (label, 'x', 63);
label[63] = '.';
label[64] = '\0';
for (unsigned i = 0; i < 64 * 1024 * 1024 / strlen (label); ++i)
fprintf (mem.out, "%s", label);
xfclose_memstream (&mem);
check_netent ("long name", getnetbyname (mem.buffer),
"error: NO_RECOVERY\n");
free (mem.buffer);
}
static int
do_test (void)
{
struct resolv_test *obj = resolv_test_start
((struct resolv_redirect_config)
{
.response_callback = response
});
/* Lookup by name, success cases. */
check_netent ("code1.example", getnetbyname ("code1.example"),
"alias: 1.in-addr.arpa\n"
"net: 0x00000001\n");
check_netent ("code2.example", getnetbyname ("code2.example"),
"alias: 2.1.in-addr.arpa\n"
"net: 0x00000102\n");
check_netent ("code3.example", getnetbyname ("code3.example"),
"alias: 3.2.1.in-addr.arpa\n"
"net: 0x00010203\n");
check_netent ("code4.example", getnetbyname ("code4.example"),
"alias: 4.3.2.1.in-addr.arpa\n"
"net: 0x01020304\n");
check_netent ("code5.example", getnetbyname ("code5.example"),
"alias: 127.in-addr.arpa\n"
"alias: 0.in-addr.arpa\n"
"net: 0x0000007f\n");
check_netent ("code6.example", getnetbyname ("code6.example"),
"alias: 127.in-addr.arpa\n"
"alias: 0.in-addr.arpa\n"
"net: 0x0000007f\n");
check_netent ("code7.example", getnetbyname ("code7.example"),
"alias: 4.3.2.1.in-addr.arpa\n"
"net: 0x01020304\n");
/* Lookup by name, failure cases. */
check_netent ("code100.example", getnetbyname ("code100.example"),
"error: NO_ADDRESS\n");
check_netent ("code101.example", getnetbyname ("code101.example"),
"error: HOST_NOT_FOUND\n");
check_netent ("code102.example", getnetbyname ("code102.example"),
"error: TRY_AGAIN\n");
check_netent ("code103.example", getnetbyname ("code103.example"),
"error: NO_RECOVERY\n");
/* Test bug #17630. */
check_netent ("code104.example", getnetbyname ("code104.example"),
"error: TRY_AGAIN\n");
/* Lookup by address, success cases. */
check_reverse (1,
"name: 1.in-addr.arpa\n"
"net: 0x00000001\n");
check_reverse (2,
"name: 2.1.in-addr.arpa\n"
"net: 0x00000002\n");
check_reverse (3,
"name: 3.2.1.in-addr.arpa\n"
"net: 0x00000003\n");
check_reverse (4,
"name: 4.3.2.1.in-addr.arpa\n"
"net: 0x00000004\n");
check_reverse (5,
"name: 127.in-addr.arpa\n"
"alias: 0.in-addr.arpa\n"
"net: 0x00000005\n");
check_reverse (6,
"name: 127.in-addr.arpa\n"
"alias: 0.in-addr.arpa\n"
"net: 0x00000006\n");
check_reverse (7,
"name: 4.3.2.1.in-addr.arpa\n"
"net: 0x00000007\n");
/* Lookup by address, failure cases. */
check_reverse (100,
"error: NO_ADDRESS\n");
check_reverse (101,
"error: HOST_NOT_FOUND\n");
check_reverse (102,
"error: TRY_AGAIN\n");
check_reverse (103,
"error: NO_RECOVERY\n");
check_long_name ();
resolv_test_end (obj);
return 0;
}
#include <support/test-driver.c>
|
