mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
b25508dd77
Without passing alt_dns_packet_buffer, __res_context_search can only store 2048 bytes (what fits into dns_packet_buffer). However, the function returns the total packet size, and the subsequent DNS parsing code in _nss_dns_gethostbyname4_r reads beyond the end of the stack-allocated buffer. Fixes commitf282cdbe7f("resolv: Implement no-aaaa stub resolver option") and bug 30842. (cherry picked from commitbd77dd7e73)
130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/* Test the RES_NOAAAA resolver option with a large response.
|
|
Copyright (C) 2022-2023 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 <stdbool.h>
|
|
#include <stdlib.h>
|
|
#include <support/check.h>
|
|
#include <support/check_nss.h>
|
|
#include <support/resolv_test.h>
|
|
#include <support/support.h>
|
|
#include <support/xmemstream.h>
|
|
|
|
/* Used to keep track of the number of queries. */
|
|
static volatile unsigned int queries;
|
|
|
|
/* If true, add a large TXT record at the start of the answer section. */
|
|
static volatile bool stuff_txt;
|
|
|
|
static void
|
|
response (const struct resolv_response_context *ctx,
|
|
struct resolv_response_builder *b,
|
|
const char *qname, uint16_t qclass, uint16_t qtype)
|
|
{
|
|
/* If not using TCP, just force its use. */
|
|
if (!ctx->tcp)
|
|
{
|
|
struct resolv_response_flags flags = {.tc = true};
|
|
resolv_response_init (b, flags);
|
|
resolv_response_add_question (b, qname, qclass, qtype);
|
|
return;
|
|
}
|
|
|
|
/* The test needs to send four queries, the first three are used to
|
|
grow the NSS buffer via the ERANGE handshake. */
|
|
++queries;
|
|
TEST_VERIFY (queries <= 4);
|
|
|
|
/* AAAA queries are supposed to be disabled. */
|
|
TEST_COMPARE (qtype, T_A);
|
|
TEST_COMPARE (qclass, C_IN);
|
|
TEST_COMPARE_STRING (qname, "example.com");
|
|
|
|
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);
|
|
|
|
if (stuff_txt)
|
|
{
|
|
resolv_response_open_record (b, qname, qclass, T_TXT, 60);
|
|
int zero = 0;
|
|
for (int i = 0; i <= 15000; ++i)
|
|
resolv_response_add_data (b, &zero, sizeof (zero));
|
|
resolv_response_close_record (b);
|
|
}
|
|
|
|
for (int i = 0; i < 200; ++i)
|
|
{
|
|
resolv_response_open_record (b, qname, qclass, qtype, 60);
|
|
char ipv4[4] = {192, 0, 2, i + 1};
|
|
resolv_response_add_data (b, &ipv4, sizeof (ipv4));
|
|
resolv_response_close_record (b);
|
|
}
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
struct resolv_test *obj = resolv_test_start
|
|
((struct resolv_redirect_config)
|
|
{
|
|
.response_callback = response
|
|
});
|
|
|
|
_res.options |= RES_NOAAAA;
|
|
|
|
for (int do_stuff_txt = 0; do_stuff_txt < 2; ++do_stuff_txt)
|
|
{
|
|
queries = 0;
|
|
stuff_txt = do_stuff_txt;
|
|
|
|
struct addrinfo *ai = NULL;
|
|
int ret;
|
|
ret = getaddrinfo ("example.com", "80",
|
|
&(struct addrinfo)
|
|
{
|
|
.ai_family = AF_UNSPEC,
|
|
.ai_socktype = SOCK_STREAM,
|
|
}, &ai);
|
|
|
|
char *expected_result;
|
|
{
|
|
struct xmemstream mem;
|
|
xopen_memstream (&mem);
|
|
for (int i = 0; i < 200; ++i)
|
|
fprintf (mem.out, "address: STREAM/TCP 192.0.2.%d 80\n", i + 1);
|
|
xfclose_memstream (&mem);
|
|
expected_result = mem.buffer;
|
|
}
|
|
|
|
check_addrinfo ("example.com", ai, ret, expected_result);
|
|
|
|
free (expected_result);
|
|
freeaddrinfo (ai);
|
|
}
|
|
|
|
resolv_test_end (obj);
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|