--- /dev/null
+/* Implement suppression of AAAA queries.
+ Copyright (C) 2022 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 <string.h>
+#include <resolv-internal.h>
+#include <resolv_context.h>
+#include <arpa/nameser.h>
+
+/* Returns true if the question type at P matches EXPECTED, and the
+ class is IN. */
+static bool
+qtype_matches (const unsigned char *p, int expected)
+{
+ /* This assumes that T_A/C_IN constants are less than 256, which
+ they are. */
+ return p[0] == 0 && p[1] == expected && p[2] == 0 && p[3] == C_IN;
+}
+
+/* Handle RES_NOAAAA translation of AAAA queries. To produce a Name
+ Error (NXDOMAIN) repsonse for domain names that do not exist, it is
+ still necessary to send a query. Using question type A is a
+ conservative choice. In the returned answer, it is necessary to
+ switch back the question type to AAAA. */
+bool
+__res_handle_no_aaaa (struct resolv_context *ctx,
+ const unsigned char *buf, int buflen,
+ unsigned char *ans, int anssiz, int *result)
+{
+ /* AAAA mode is not active, or the query looks invalid (will not be
+ able to be parsed). */
+ if ((ctx->resp->options & RES_NOAAAA) == 0
+ || buflen <= sizeof (HEADER))
+ return false;
+
+ /* The replacement A query is produced here. */
+ struct
+ {
+ HEADER header;
+ unsigned char question[NS_MAXCDNAME + 4];
+ } replacement;
+ memcpy (&replacement.header, buf, sizeof (replacement.header));
+
+ if (replacement.header.qr
+ || replacement.header.opcode != 0
+ || replacement.header.rcode != 0
+ || ntohs (replacement.header.qdcount) != 1
+ || ntohs (replacement.header.ancount) != 0
+ || ntohs (replacement.header.nscount) != 0)
+ /* Not a well-formed question. Let the core resolver code produce
+ the proper error. */
+ return false;
+
+ /* Disable EDNS0. */
+ replacement.header.arcount = htons (0);
+
+ /* Extract the QNAME. */
+ int ret = __ns_name_unpack (buf, buf + buflen, buf + sizeof (HEADER),
+ replacement.question, NS_MAXCDNAME);
+ if (ret < 0)
+ /* Format error. */
+ return false;
+
+ /* Compute the end of the question name. */
+ const unsigned char *after_question = buf + sizeof (HEADER) + ret;
+
+ /* Check that we are dealing with an AAAA query. */
+ if (buf + buflen - after_question < 4
+ || !qtype_matches (after_question, T_AAAA))
+ return false;
+
+ /* Find the place to store the type/class data in the replacement
+ query. */
+ after_question = replacement.question;
+ /* This cannot fail because __ns_name_unpack above produced a valid
+ domain name. */
+ (void) __ns_name_skip (&after_question, &replacement.question[NS_MAXCDNAME]);
+ unsigned char *start_of_query = (unsigned char *) &replacement;
+ const unsigned char *end_of_query = after_question + 4;
+
+ /* Produce an A/IN query. */
+ {
+ unsigned char *p = (unsigned char *) after_question;
+ p[0] = 0;
+ p[1] = T_A;
+ p[2] = 0;
+ p[3] = C_IN;
+ }
+
+ /* Clear the output buffer, to avoid reading undefined data when
+ rewriting the result from A to AAAA. */
+ memset (ans, 0, anssiz);
+
+ /* Always perform the message translation, independent of the error
+ code. */
+ ret = __res_context_send (ctx,
+ start_of_query, end_of_query - start_of_query,
+ NULL, 0, ans, anssiz,
+ NULL, NULL, NULL, NULL, NULL);
+
+ /* Patch in the AAAA question type if there is room and the A query
+ type was received. */
+ after_question = ans + sizeof (HEADER);
+ if (__ns_name_skip (&after_question, ans + anssiz) == 0
+ && ans + anssiz - after_question >= 4
+ && qtype_matches (after_question, T_A))
+ {
+ ((unsigned char *) after_question)[1] = T_AAAA;
+
+ /* Create an aligned copy of the header. Hide all data except
+ the question from the response. Put back the header. There is
+ no need to change the response code. The zero answer count turns
+ a positive response with data into a no-data response. */
+ memcpy (&replacement.header, ans, sizeof (replacement.header));
+ replacement.header.ancount = htons (0);
+ replacement.header.nscount = htons (0);
+ replacement.header.arcount = htons (0);
+ memcpy (ans, &replacement.header, sizeof (replacement.header));
+
+ /* Truncate the reply. */
+ if (ret <= 0)
+ *result = ret;
+ else
+ *result = after_question - ans + 4;
+ }
+
+ return true;
+}
--- /dev/null
+/* Test the RES_NOAAAA resolver option.
+ Copyright (C) 2022 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 <stdlib.h>
+#include <support/check.h>
+#include <support/check_nss.h>
+#include <support/resolv_test.h>
+#include <support/support.h>
+
+/* Used to keep track of the number of queries. */
+static volatile unsigned int queries;
+
+static void
+response (const struct resolv_response_context *ctx,
+ struct resolv_response_builder *b,
+ const char *qname, uint16_t qclass, uint16_t qtype)
+{
+ /* Each test should only send one query. */
+ ++queries;
+ TEST_COMPARE (queries, 1);
+
+ /* AAAA queries are supposed to be disabled. */
+ TEST_VERIFY (qtype != T_AAAA);
+ TEST_COMPARE (qclass, C_IN);
+
+ /* The only other query type besides A is PTR. */
+ if (qtype != T_A)
+ TEST_COMPARE (qtype, T_PTR);
+
+ int an, ns, ar;
+ char *tail;
+ if (sscanf (qname, "an%d.ns%d.ar%d.%ms", &an, &ns, &ar, &tail) != 4)
+ FAIL_EXIT1 ("invalid QNAME: %s\n", qname);
+ TEST_COMPARE_STRING (tail, "example");
+ free (tail);
+
+ if (an < 0 || ns < 0 || ar < 0)
+ {
+ struct resolv_response_flags flags = { .rcode = NXDOMAIN, };
+ resolv_response_init (b, flags);
+ resolv_response_add_question (b, qname, qclass, qtype);
+ return;
+ }
+
+ 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);
+ for (int i = 0; i < an; ++i)
+ {
+ resolv_response_open_record (b, qname, qclass, qtype, 60);
+ switch (qtype)
+ {
+ case T_A:
+ char ipv4[4] = {192, 0, 2, i + 1};
+ resolv_response_add_data (b, &ipv4, sizeof (ipv4));
+ break;
+
+ case T_PTR:
+ char *name = xasprintf ("ptr-%d", i);
+ resolv_response_add_name (b, name);
+ free (name);
+ break;
+ }
+ resolv_response_close_record (b);
+ }
+
+ resolv_response_section (b, ns_s_ns);
+ for (int i = 0; i < ns; ++i)
+ {
+ resolv_response_open_record (b, qname, qclass, T_NS, 60);
+ char *name = xasprintf ("ns%d.example.net", i);
+ resolv_response_add_name (b, name);
+ free (name);
+ resolv_response_close_record (b);
+ }
+
+ resolv_response_section (b, ns_s_ar);
+ int addr = 1;
+ for (int i = 0; i < ns; ++i)
+ {
+ char *name = xasprintf ("ns%d.example.net", i);
+ for (int j = 0; j < ar; ++j)
+ {
+ resolv_response_open_record (b, name, qclass, T_A, 60);
+ char ipv4[4] = {192, 0, 2, addr};
+ resolv_response_add_data (b, &ipv4, sizeof (ipv4));
+ resolv_response_close_record (b);
+
+ resolv_response_open_record (b, name, qclass, T_AAAA, 60);
+ char ipv6[16]
+ = {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, addr};
+ resolv_response_add_data (b, &ipv6, sizeof (ipv6));
+ resolv_response_close_record (b);
+
+ ++addr;
+ }
+ free (name);
+ }
+}
+
+/* Number of modes. Lowest bit encodes *n* function vs implicit _res
+ argument. The mode numbers themselves are arbitrary. */
+enum { mode_count = 8 };
+
+/* res_send-like modes do not perform error translation. */
+enum { first_send_mode = 6 };
+
+static int
+libresolv_query (unsigned int mode, const char *qname, uint16_t qtype,
+ unsigned char *buf, size_t buflen)
+{
+ int saved_errno = errno;
+
+ TEST_VERIFY_EXIT (mode < mode_count);
+
+ switch (mode)
+ {
+ case 0:
+ return res_query (qname, C_IN, qtype, buf, buflen);
+ case 1:
+ return res_nquery (&_res, qname, C_IN, qtype, buf, buflen);
+ case 2:
+ return res_search (qname, C_IN, qtype, buf, buflen);
+ case 3:
+ return res_nsearch (&_res, qname, C_IN, qtype, buf, buflen);
+ case 4:
+ return res_querydomain (qname, "", C_IN, qtype, buf, buflen);
+ case 5:
+ return res_nquerydomain (&_res, qname, "", C_IN, qtype, buf, buflen);
+ case 6:
+ {
+ unsigned char querybuf[512];
+ int ret = res_mkquery (QUERY, qname, C_IN, qtype,
+ NULL, 0, NULL, querybuf, sizeof (querybuf));
+ TEST_VERIFY_EXIT (ret > 0);
+ errno = saved_errno;
+ return res_send (querybuf, ret, buf, buflen);
+ }
+ case 7:
+ {
+ unsigned char querybuf[512];
+ int ret = res_nmkquery (&_res, QUERY, qname, C_IN, qtype,
+ NULL, 0, NULL, querybuf, sizeof (querybuf));
+ TEST_VERIFY_EXIT (ret > 0);
+ errno = saved_errno;
+ return res_nsend (&_res, querybuf, ret, buf, buflen);
+ }
+ }
+ __builtin_unreachable ();
+}
+
+static int
+do_test (void)
+{
+ struct resolv_test *obj = resolv_test_start
+ ((struct resolv_redirect_config)
+ {
+ .response_callback = response
+ });
+
+ _res.options |= RES_NOAAAA;
+
+ check_hostent ("an1.ns2.ar1.example",
+ gethostbyname ("an1.ns2.ar1.example"),
+ "name: an1.ns2.ar1.example\n"
+ "address: 192.0.2.1\n");
+ queries = 0;
+ check_hostent ("an0.ns2.ar1.example",
+ gethostbyname ("an0.ns2.ar1.example"),
+ "error: NO_ADDRESS\n");
+ queries = 0;
+ check_hostent ("an-1.ns2.ar1.example",
+ gethostbyname ("an-1.ns2.ar1.example"),
+ "error: HOST_NOT_FOUND\n");
+ queries = 0;
+
+ check_hostent ("an1.ns2.ar1.example AF_INET",
+ gethostbyname2 ("an1.ns2.ar1.example", AF_INET),
+ "name: an1.ns2.ar1.example\n"
+ "address: 192.0.2.1\n");
+ queries = 0;
+ check_hostent ("an0.ns2.ar1.example AF_INET",
+ gethostbyname2 ("an0.ns2.ar1.example", AF_INET),
+ "error: NO_ADDRESS\n");
+ queries = 0;
+ check_hostent ("an-1.ns2.ar1.example AF_INET",
+ gethostbyname2 ("an-1.ns2.ar1.example", AF_INET),
+ "error: HOST_NOT_FOUND\n");
+ queries = 0;
+
+ check_hostent ("an1.ns2.ar1.example AF_INET6",
+ gethostbyname2 ("an1.ns2.ar1.example", AF_INET6),
+ "error: NO_ADDRESS\n");
+ queries = 0;
+ check_hostent ("an0.ns2.ar1.example AF_INET6",
+ gethostbyname2 ("an0.ns2.ar1.example", AF_INET6),
+ "error: NO_ADDRESS\n");
+ queries = 0;
+ check_hostent ("an-1.ns2.ar1.example AF_INET6",
+ gethostbyname2 ("an-1.ns2.ar1.example", AF_INET6),
+ "error: HOST_NOT_FOUND\n");
+ queries = 0;
+
+ /* Multiple addresses. */
+ check_hostent ("an2.ns0.ar0.example",
+ gethostbyname ("an2.ns0.ar0.example"),
+ "name: an2.ns0.ar0.example\n"
+ "address: 192.0.2.1\n"
+ "address: 192.0.2.2\n");
+ queries = 0;
+ check_hostent ("an2.ns0.ar0.example AF_INET6",
+ gethostbyname2 ("an2.ns0.ar0.example", AF_INET6),
+ "error: NO_ADDRESS\n");
+ queries = 0;
+
+ /* getaddrinfo checks with one address. */
+ struct addrinfo *ai;
+ int ret;
+ ret = getaddrinfo ("an1.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_INET,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an1.ns2.ar1.example (AF_INET)", ai, ret,
+ "address: STREAM/TCP 192.0.2.1 80\n");
+ freeaddrinfo (ai);
+ queries = 0;
+ ret = getaddrinfo ("an1.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_INET6,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an1.ns2.ar1.example (AF_INET6)", ai, ret,
+ "error: No address associated with hostname\n");
+ queries = 0;
+ ret = getaddrinfo ("an1.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an1.ns2.ar1.example (AF_UNSPEC)", ai, ret,
+ "address: STREAM/TCP 192.0.2.1 80\n");
+ freeaddrinfo (ai);
+ queries = 0;
+
+ /* getaddrinfo checks with three addresses. */
+ ret = getaddrinfo ("an3.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_INET,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an3.ns2.ar1.example (AF_INET)", ai, ret,
+ "address: STREAM/TCP 192.0.2.1 80\n"
+ "address: STREAM/TCP 192.0.2.2 80\n"
+ "address: STREAM/TCP 192.0.2.3 80\n");
+ freeaddrinfo (ai);
+ queries = 0;
+ ret = getaddrinfo ("an3.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_INET6,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an3.ns2.ar1.example (AF_INET6)", ai, ret,
+ "error: No address associated with hostname\n");
+ queries = 0;
+ ret = getaddrinfo ("an3.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an3.ns2.ar1.example (AF_UNSPEC)", ai, ret,
+ "address: STREAM/TCP 192.0.2.1 80\n"
+ "address: STREAM/TCP 192.0.2.2 80\n"
+ "address: STREAM/TCP 192.0.2.3 80\n");
+ freeaddrinfo (ai);
+ queries = 0;
+
+ /* getaddrinfo checks with no address. */
+ ret = getaddrinfo ("an0.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_INET,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an0.ns2.ar1.example (AF_INET)", ai, ret,
+ "error: No address associated with hostname\n");
+ queries = 0;
+ ret = getaddrinfo ("an0.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_INET6,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an0.ns2.ar1.example (AF_INET6)", ai, ret,
+ "error: No address associated with hostname\n");
+ queries = 0;
+ ret = getaddrinfo ("an0.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an-1.ns2.ar1.example (AF_UNSPEC)", ai, ret,
+ "error: No address associated with hostname\n");
+ queries = 0;
+
+ /* getaddrinfo checks with NXDOMAIN. */
+ ret = getaddrinfo ("an-1.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_INET,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an-1.ns2.ar1.example (AF_INET)", ai, ret,
+ "error: Name or service not known\n");
+ queries = 0;
+ ret = getaddrinfo ("an-1.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_INET6,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an-1.ns2.ar1.example (AF_INET6)", ai, ret,
+ "error: Name or service not known\n");
+ queries = 0;
+ ret = getaddrinfo ("an-1.ns2.ar1.example", "80",
+ &(struct addrinfo)
+ {
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_STREAM,
+ }, &ai);
+ check_addrinfo ("an-1.ns2.ar1.example (AF_UNSPEC)", ai, ret,
+ "error: Name or service not known\n");
+ queries = 0;
+
+ for (unsigned int mode = 0; mode < mode_count; ++mode)
+ {
+ unsigned char *buf;
+ int ret;
+
+ /* Response for A. */
+ buf = malloc (512);
+ ret = libresolv_query (mode, "an1.ns2.ar1.example", T_A, buf, 512);
+ TEST_VERIFY_EXIT (ret > 0);
+ check_dns_packet ("an1.ns2.ar1.example A", buf, ret,
+ "name: an1.ns2.ar1.example\n"
+ "address: 192.0.2.1\n");
+ free (buf);
+ queries = 0;
+
+ /* NODATA response for A. */
+ buf = malloc (512);
+ errno = 0;
+ ret = libresolv_query (mode, "an0.ns2.ar1.example", T_A, buf, 512);
+ if (mode < first_send_mode)
+ {
+ TEST_COMPARE (ret, -1);
+ TEST_COMPARE (errno, 0);
+ TEST_COMPARE (h_errno, NO_ADDRESS);
+ }
+ else
+ {
+ TEST_VERIFY_EXIT (ret > 0);
+ TEST_COMPARE (((HEADER *)buf)->rcode, 0);
+ check_dns_packet ("an1.ns2.ar1.example A", buf, ret,
+ "name: an0.ns2.ar1.example\n");
+ }
+ free (buf);
+ queries = 0;
+
+ /* NXDOMAIN response for A. */
+ buf = malloc (512);
+ errno = 0;
+ ret = libresolv_query (mode, "an-1.ns2.ar1.example", T_A, buf, 512);
+ if (mode < first_send_mode)
+ {
+ TEST_COMPARE (ret, -1);
+ TEST_COMPARE (errno, 0);
+ TEST_COMPARE (h_errno, HOST_NOT_FOUND);
+ }
+ else
+ {
+ TEST_VERIFY_EXIT (ret > 0);
+ TEST_COMPARE (((HEADER *)buf)->rcode, NXDOMAIN);
+ check_dns_packet ("an1.ns2.ar1.example A", buf, ret,
+ "name: an-1.ns2.ar1.example\n");
+ }
+ free (buf);
+ queries = 0;
+
+ /* Response for PTR. */
+ buf = malloc (512);
+ ret = libresolv_query (mode, "an1.ns2.ar1.example", T_PTR, buf, 512);
+ TEST_VERIFY_EXIT (ret > 0);
+ check_dns_packet ("an1.ns2.ar1.example PTR", buf, ret,
+ "name: an1.ns2.ar1.example\n"
+ "data: an1.ns2.ar1.example PTR ptr-0\n");
+ free (buf);
+ queries = 0;
+
+ /* NODATA response for PTR. */
+ buf = malloc (512);
+ errno = 0;
+ ret = libresolv_query (mode, "an0.ns2.ar1.example", T_PTR, buf, 512);
+ if (mode < first_send_mode)
+ {
+ TEST_COMPARE (ret, -1);
+ TEST_COMPARE (errno, 0);
+ TEST_COMPARE (h_errno, NO_ADDRESS);
+ }
+ else
+ {
+ TEST_VERIFY_EXIT (ret > 0);
+ TEST_COMPARE (((HEADER *)buf)->rcode, 0);
+ check_dns_packet ("an1.ns2.ar1.example PTR", buf, ret,
+ "name: an0.ns2.ar1.example\n");
+ }
+ free (buf);
+ queries = 0;
+
+ /* NXDOMAIN response for PTR. */
+ buf = malloc (512);
+ errno = 0;
+ ret = libresolv_query (mode, "an-1.ns2.ar1.example", T_PTR, buf, 512);
+ if (mode < first_send_mode)
+ {
+ TEST_COMPARE (ret, -1);
+ TEST_COMPARE (errno, 0);
+ TEST_COMPARE (h_errno, HOST_NOT_FOUND);
+ }
+ else
+ {
+ TEST_VERIFY_EXIT (ret > 0);
+ TEST_COMPARE (((HEADER *)buf)->rcode, NXDOMAIN);
+ check_dns_packet ("an1.ns2.ar1.example PTR", buf, ret,
+ "name: an-1.ns2.ar1.example\n");
+ }
+ free (buf);
+ queries = 0;
+
+ /* NODATA response for AAAA. */
+ buf = malloc (512);
+ errno = 0;
+ ret = libresolv_query (mode, "an1.ns2.ar1.example", T_AAAA, buf, 512);
+ if (mode < first_send_mode)
+ {
+ TEST_COMPARE (ret, -1);
+ TEST_COMPARE (errno, 0);
+ TEST_COMPARE (h_errno, NO_ADDRESS);
+ }
+ else
+ {
+ TEST_VERIFY_EXIT (ret > 0);
+ TEST_COMPARE (((HEADER *)buf)->rcode, 0);
+ check_dns_packet ("an1.ns2.ar1.example A", buf, ret,
+ "name: an1.ns2.ar1.example\n");
+ }
+ free (buf);
+ queries = 0;
+
+ /* NODATA response for AAAA (original is already NODATA). */
+ buf = malloc (512);
+ errno = 0;
+ ret = libresolv_query (mode, "an0.ns2.ar1.example", T_AAAA, buf, 512);
+ if (mode < first_send_mode)
+ {
+ TEST_COMPARE (ret, -1);
+ TEST_COMPARE (errno, 0);
+ TEST_COMPARE (h_errno, NO_ADDRESS);
+ }
+ else
+ {
+ TEST_VERIFY_EXIT (ret > 0);
+ TEST_COMPARE (((HEADER *)buf)->rcode, 0);
+ check_dns_packet ("an0.ns2.ar1.example A", buf, ret,
+ "name: an0.ns2.ar1.example\n");
+ }
+ free (buf);
+ queries = 0;
+
+ /* NXDOMAIN response. */
+ buf = malloc (512);
+ errno = 0;
+ ret = libresolv_query (mode, "an-1.ns2.ar1.example", T_AAAA, buf, 512);
+ if (mode < first_send_mode)
+ {
+ TEST_COMPARE (ret, -1);
+ TEST_COMPARE (errno, 0);
+ TEST_COMPARE (h_errno, HOST_NOT_FOUND);
+ }
+ else
+ {
+ TEST_VERIFY_EXIT (ret > 0);
+ TEST_COMPARE (((HEADER *)buf)->rcode, NXDOMAIN);
+ check_dns_packet ("an-1.ns2.ar1.example A", buf, ret,
+ "name: an-1.ns2.ar1.example\n");
+ }
+ free (buf);
+ queries = 0;
+ }
+
+ resolv_test_end (obj);
+
+ return 0;
+}
+
+#include <support/test-driver.c>