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327 lines
12 KiB
C
327 lines
12 KiB
C
/* Test reverse DNS lookup.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <arpa/inet.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/check_nss.h>
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#include <support/next_to_fault.h>
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#include <support/resolv_test.h>
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#include <support/support.h>
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#include "tst-resolv-maybe_insert_sig.h"
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/* QNAME format:
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ADDRESSES.CNAMES...(lots of 0s)...8.b.d.0.1.0.0.2.ip6.arpa.
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CNAMES|ADDRESSES.2.0.192.in-addr-arpa.
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For the IPv4 reverse lookup, the address count is in the lower
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bits.
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CNAMES is the length of the CNAME chain, ADDRESSES is the number of
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addresses in the response. The special value 15 means that there
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are no addresses, and the RCODE is NXDOMAIN. */
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static void
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response (const struct resolv_response_context *ctx,
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struct resolv_response_builder *b,
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const char *qname, uint16_t qclass, uint16_t qtype)
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{
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TEST_COMPARE (qclass, C_IN);
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TEST_COMPARE (qtype, T_PTR);
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unsigned int addresses, cnames, bits;
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char *tail;
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if (strstr (qname, "ip6.arpa") != NULL
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&& sscanf (qname, "%x.%x.%ms", &addresses, &cnames, &tail) == 3)
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TEST_COMPARE_STRING (tail, "\
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0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa");
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else if (sscanf (qname, "%u.%ms", &bits, &tail) == 2)
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{
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TEST_COMPARE_STRING (tail, "2.0.192.in-addr.arpa");
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addresses = bits & 0x0f;
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cnames = bits >> 4;
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}
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else
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FAIL_EXIT1 ("invalid QNAME: %s", qname);
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free (tail);
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int rcode;
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if (addresses == 15)
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{
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/* Special case: Use no addresses with NXDOMAIN response. */
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rcode = ns_r_nxdomain;
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addresses = 0;
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}
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else
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rcode = 0;
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struct resolv_response_flags flags = { .rcode = rcode };
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resolv_response_init (b, flags);
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resolv_response_add_question (b, qname, qclass, qtype);
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resolv_response_section (b, ns_s_an);
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maybe_insert_sig (b, qname);
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/* Provide the requested number of CNAME records. */
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char *previous_name = (char *) qname;
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for (int unique = 0; unique < cnames; ++unique)
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{
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resolv_response_open_record (b, previous_name, qclass, T_CNAME, 60);
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char *new_name = xasprintf ("%d.alias.example", unique);
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resolv_response_add_name (b, new_name);
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resolv_response_close_record (b);
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maybe_insert_sig (b, qname);
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if (previous_name != qname)
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free (previous_name);
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previous_name = new_name;
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}
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for (int unique = 0; unique < addresses; ++unique)
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{
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resolv_response_open_record (b, previous_name, qclass, T_PTR, 60);
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char *ptr = xasprintf ("unique-%d.cnames-%u.addresses-%u.example",
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unique, cnames, addresses);
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resolv_response_add_name (b, ptr);
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free (ptr);
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resolv_response_close_record (b);
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}
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if (previous_name != qname)
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free (previous_name);
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}
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/* Used to check that gethostbyaddr_r does not write past the buffer
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end. */
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static struct support_next_to_fault ntf;
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/* Perform a gethostbyaddr call and check the result. */
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static void
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check_gethostbyaddr (const char *address, const char *expected)
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{
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unsigned char bytes[16];
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unsigned int byteslen;
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int family;
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if (strchr (address, ':') != NULL)
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{
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family = AF_INET6;
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byteslen = 16;
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}
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else
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{
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family = AF_INET;
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byteslen = 4;
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}
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TEST_COMPARE (inet_pton (family, address, bytes), 1);
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struct hostent *e = gethostbyaddr (bytes, byteslen, family);
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check_hostent (address, e, expected);
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if (e == NULL)
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return;
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/* Try gethostbyaddr_r with increasing sizes until success. First
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compute a reasonable minimum buffer size, to avoid many pointless
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attempts. */
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size_t minimum_size = strlen (e->h_name);
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for (int i = 0; e->h_addr_list[i] != NULL; ++i)
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minimum_size += e->h_length + sizeof (char *);
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for (int i = 0; e->h_aliases[i] != NULL; ++i)
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minimum_size += strlen (e->h_aliases[i]) + 1 + sizeof (char *);
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/* Gradually increase the size until success. */
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for (size_t size = minimum_size; size < ntf.length; ++size)
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{
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struct hostent result;
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int herrno;
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int ret = gethostbyaddr_r (bytes, byteslen, family, &result,
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ntf.buffer + ntf.length - size, size,
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&e, &herrno);
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if (ret == ERANGE)
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/* Retry with larger size. */
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TEST_COMPARE (herrno, NETDB_INTERNAL);
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else if (ret == 0)
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{
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TEST_VERIFY (size > minimum_size);
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check_hostent (address, e, expected);
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return;
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}
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else
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FAIL_EXIT1 ("Unexpected gethostbyaddr_r failure: %d", ret);
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}
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FAIL_EXIT1 ("gethostbyaddr_r always failed for: %s", address);
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}
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/* Perform a getnameinfo call and check the result. */
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static void
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check_getnameinfo (const char *address, const char *expected)
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{
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struct sockaddr_in sin = { };
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struct sockaddr_in6 sin6 = { };
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void *sa;
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socklen_t salen;
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if (strchr (address, ':') != NULL)
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{
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sin6.sin6_family = AF_INET6;
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TEST_COMPARE (inet_pton (AF_INET6, address, &sin6.sin6_addr), 1);
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sin6.sin6_port = htons (80);
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sa = &sin6;
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salen = sizeof (sin6);
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}
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else
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{
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sin.sin_family = AF_INET;
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TEST_COMPARE (inet_pton (AF_INET, address, &sin.sin_addr), 1);
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sin.sin_port = htons (80);
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sa = &sin;
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salen = sizeof (sin);
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}
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char host[64];
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char service[64];
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int ret = getnameinfo (sa, salen, host,
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sizeof (host), service, sizeof (service),
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NI_NAMEREQD | NI_NUMERICSERV);
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switch (ret)
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{
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case 0:
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TEST_COMPARE_STRING (host, expected);
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TEST_COMPARE_STRING (service, "80");
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break;
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case EAI_SYSTEM:
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TEST_COMPARE_STRING (strerror (errno), expected);
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break;
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default:
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TEST_COMPARE_STRING (gai_strerror (ret), expected);
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}
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}
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static int
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do_test (void)
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{
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/* Some reasonably upper bound for the maximum response size. */
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ntf = support_next_to_fault_allocate (4096);
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struct resolv_test *obj = resolv_test_start
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((struct resolv_redirect_config)
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{
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.response_callback = response
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});
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for (int do_insert_sig = 0; do_insert_sig < 2; ++do_insert_sig)
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{
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insert_sig = do_insert_sig;
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/* No PTR record, RCODE=0. */
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check_gethostbyaddr ("192.0.2.0", "error: NO_RECOVERY\n");
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check_getnameinfo ("192.0.2.0", "Name or service not known");
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check_gethostbyaddr ("192.0.2.16", "error: NO_RECOVERY\n");
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check_getnameinfo ("192.0.2.16", "Name or service not known");
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check_gethostbyaddr ("192.0.2.32", "error: NO_RECOVERY\n");
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check_getnameinfo ("192.0.2.32", "Name or service not known");
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check_gethostbyaddr ("2001:db8::", "error: NO_RECOVERY\n");
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check_getnameinfo ("2001:db8::", "Name or service not known");
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check_gethostbyaddr ("2001:db8::10", "error: NO_RECOVERY\n");
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check_getnameinfo ("2001:db8::10", "Name or service not known");
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check_gethostbyaddr ("2001:db8::20", "error: NO_RECOVERY\n");
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check_getnameinfo ("2001:db8::20", "Name or service not known");
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/* No PTR record, NXDOMAIN. */
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check_gethostbyaddr ("192.0.2.15", "error: HOST_NOT_FOUND\n");
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check_getnameinfo ("192.0.2.15", "Name or service not known");
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check_gethostbyaddr ("192.0.2.31", "error: HOST_NOT_FOUND\n");
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check_getnameinfo ("192.0.2.31", "Name or service not known");
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check_gethostbyaddr ("192.0.2.47", "error: HOST_NOT_FOUND\n");
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check_getnameinfo ("192.0.2.47", "Name or service not known");
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check_gethostbyaddr ("2001:db8::f", "error: HOST_NOT_FOUND\n");
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check_getnameinfo ("2001:db8::f", "Name or service not known");
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check_gethostbyaddr ("2001:db8::1f", "error: HOST_NOT_FOUND\n");
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check_getnameinfo ("2001:db8::1f", "Name or service not known");
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check_gethostbyaddr ("2001:db8::2f", "error: HOST_NOT_FOUND\n");
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check_getnameinfo ("2001:db8::2f", "Name or service not known");
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/* Actual response data. Only the first PTR record is returned. */
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check_gethostbyaddr ("192.0.2.1",
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"name: unique-0.cnames-0.addresses-1.example\n"
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"address: 192.0.2.1\n");
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check_getnameinfo ("192.0.2.1",
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"unique-0.cnames-0.addresses-1.example");
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check_gethostbyaddr ("192.0.2.17",
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"name: unique-0.cnames-1.addresses-1.example\n"
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"address: 192.0.2.17\n");
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check_getnameinfo ("192.0.2.17",
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"unique-0.cnames-1.addresses-1.example");
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check_gethostbyaddr ("192.0.2.18",
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"name: unique-0.cnames-1.addresses-2.example\n"
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"address: 192.0.2.18\n");
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check_getnameinfo ("192.0.2.18",
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"unique-0.cnames-1.addresses-2.example");
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check_gethostbyaddr ("192.0.2.33",
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"name: unique-0.cnames-2.addresses-1.example\n"
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"address: 192.0.2.33\n");
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check_getnameinfo ("192.0.2.33",
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"unique-0.cnames-2.addresses-1.example");
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check_gethostbyaddr ("192.0.2.34",
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"name: unique-0.cnames-2.addresses-2.example\n"
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"address: 192.0.2.34\n");
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check_getnameinfo ("192.0.2.34",
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"unique-0.cnames-2.addresses-2.example");
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/* Same for IPv6 addresses. */
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check_gethostbyaddr ("2001:db8::1",
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"name: unique-0.cnames-0.addresses-1.example\n"
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"address: 2001:db8::1\n");
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check_getnameinfo ("2001:db8::1",
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"unique-0.cnames-0.addresses-1.example");
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check_gethostbyaddr ("2001:db8::11",
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"name: unique-0.cnames-1.addresses-1.example\n"
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"address: 2001:db8::11\n");
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check_getnameinfo ("2001:db8::11",
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"unique-0.cnames-1.addresses-1.example");
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check_gethostbyaddr ("2001:db8::12",
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"name: unique-0.cnames-1.addresses-2.example\n"
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"address: 2001:db8::12\n");
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check_getnameinfo ("2001:db8::12",
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"unique-0.cnames-1.addresses-2.example");
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check_gethostbyaddr ("2001:db8::21",
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"name: unique-0.cnames-2.addresses-1.example\n"
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"address: 2001:db8::21\n");
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check_getnameinfo ("2001:db8::21",
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"unique-0.cnames-2.addresses-1.example");
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check_gethostbyaddr ("2001:db8::22",
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"name: unique-0.cnames-2.addresses-2.example\n"
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"address: 2001:db8::22\n");
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check_getnameinfo ("2001:db8::22",
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"unique-0.cnames-2.addresses-2.example");
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}
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resolv_test_end (obj);
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support_next_to_fault_free (&ntf);
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return 0;
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}
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#include <support/test-driver.c>
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