test-dns-packet: add framework to read and dump packets

Packets are stored in a simple format:
<size> <packet-wire-format> <size> <packet-wire-format> ...

Packets for some example domains are dumped, to test rr code for various
record types. Currently:
A
AAAA
CAA
DNSKEY
LOC
MX
NS
NSEC
OPENPGPKEY
SOA
SPF
TXT

The hashing code is executed, but results are not checked.

Also build other tests in src/resolve only with --enable-resolve.

.gitignore

@@ -184,6 +184,7 @@
 /test-dhcp-server
 /test-dhcp6-client
 /test-dns-domain
+/test-dns-packet
 /test-dnssec
 /test-efi-disk.img
 /test-ellipsize

Makefile.am

@@ -1501,6 +1501,7 @@ tests += \
 	test-af-list \
 	test-arphrd-list \
 	test-dns-domain \
+	test-dns-packet \
 	test-resolve-tables \
 	test-install-root \
 	test-rlimit-util \
@@ -1666,16 +1667,6 @@ test_dns_domain_LDADD = \
 	libsystemd-network.la \
 	libshared.la
 
-test_resolve_tables_SOURCES = \
-	src/resolve/test-resolve-tables.c \
-	src/shared/test-tables.h \
-	src/resolve/dns-type.c \
-	src/resolve/dns-type.h \
-	src/resolve/dns_type-from-name.h \
-	src/resolve/dns_type-to-name.h
-
-test_resolve_tables_LDADD = \
-	libshared.la
 
 if ENABLE_EFI
 manual_tests += \
@@ -5166,6 +5157,20 @@ EXTRA_DIST += \
 # ------------------------------------------------------------------------------
 if ENABLE_RESOLVED
 
+basic_dns_sources = \
+	src/resolve/resolved-dns-dnssec.c \
+	src/resolve/resolved-dns-dnssec.h \
+	src/resolve/resolved-dns-packet.c \
+	src/resolve/resolved-dns-packet.h \
+	src/resolve/resolved-dns-rr.c \
+	src/resolve/resolved-dns-rr.h \
+	src/resolve/resolved-dns-answer.c \
+	src/resolve/resolved-dns-answer.h \
+	src/resolve/resolved-dns-question.c \
+	src/resolve/resolved-dns-question.h \
+	src/resolve/dns-type.c \
+	src/resolve/dns-type.h
+
 systemd_resolved_SOURCES = \
 	src/resolve/resolved.c \
 	src/resolve/resolved-manager.c \
@@ -5185,14 +5190,7 @@ systemd_resolved_SOURCES = \
 	src/resolve/resolved-mdns.h \
 	src/resolve/resolved-mdns.c \
 	src/resolve/resolved-def.h \
-	src/resolve/resolved-dns-rr.h \
+	$(basic_dns_sources) \
-	src/resolve/resolved-dns-rr.c \
-	src/resolve/resolved-dns-question.h \
-	src/resolve/resolved-dns-question.c \
-	src/resolve/resolved-dns-answer.h \
-	src/resolve/resolved-dns-answer.c \
-	src/resolve/resolved-dns-packet.h \
-	src/resolve/resolved-dns-packet.c \
 	src/resolve/resolved-dns-query.h \
 	src/resolve/resolved-dns-query.c \
 	src/resolve/resolved-dns-synthesize.h \
@@ -5211,14 +5209,10 @@ systemd_resolved_SOURCES = \
 	src/resolve/resolved-dns-zone.c \
 	src/resolve/resolved-dns-stream.h \
 	src/resolve/resolved-dns-stream.c \
-	src/resolve/resolved-dns-dnssec.h \
-	src/resolve/resolved-dns-dnssec.c \
 	src/resolve/resolved-dns-trust-anchor.h \
 	src/resolve/resolved-dns-trust-anchor.c \
 	src/resolve/resolved-etc-hosts.h \
 	src/resolve/resolved-etc-hosts.c \
-	src/resolve/dns-type.c \
-	src/resolve/dns-type.h \
 	src/shared/gcrypt-util.c \
 	src/shared/gcrypt-util.h
 
@@ -5280,18 +5274,7 @@ lib_LTLIBRARIES += \
 
 systemd_resolve_SOURCES = \
 	src/resolve/resolve-tool.c \
-	src/resolve/resolved-dns-dnssec.c \
+	$(basic_dns_sources) \
-	src/resolve/resolved-dns-dnssec.h \
-	src/resolve/resolved-dns-packet.c \
-	src/resolve/resolved-dns-packet.h \
-	src/resolve/resolved-dns-rr.c \
-	src/resolve/resolved-dns-rr.h \
-	src/resolve/resolved-dns-answer.c \
-	src/resolve/resolved-dns-answer.h \
-	src/resolve/resolved-dns-question.c \
-	src/resolve/resolved-dns-question.h \
-	src/resolve/dns-type.c \
-	src/resolve/dns-type.h \
 	src/shared/gcrypt-util.c \
 	src/shared/gcrypt-util.h
 
@@ -5312,20 +5295,36 @@ tests += \
 manual_tests += \
 	test-dnssec-complex
 
+test_resolve_tables_SOURCES = \
+	src/resolve/test-resolve-tables.c \
+	src/resolve/dns_type-from-name.h \
+	src/resolve/dns_type-to-name.h \
+	$(basic_dns_sources) \
+	src/shared/test-tables.h
+
+test_resolve_tables_LDADD = \
+	libshared.la
+
+test_dns_packet_SOURCES = \
+	src/resolve/test-dns-packet.c \
+	$(basic_dns_sources)
+
+test_dns_packet_LDADD = \
+	libshared.la
+
+EXTRA_DIST += \
+	src/resolve/test-data/_openpgpkey.fedoraproject.org.pkts \
+	src/resolve/test-data/fedoraproject.org.pkts \
+	src/resolve/test-data/gandi.net.pkts \
+	src/resolve/test-data/google.com.pkts \
+	src/resolve/test-data/root.pkts \
+	src/resolve/test-data/sw1a1aa-sw1a2aa-sw1a2ab-sw1a2ac.find.me.uk.pkts \
+	src/resolve/test-data/teamits.com.pkts \
+	src/resolve/test-data/zbyszek@fedoraproject.org.pkts
+
 test_dnssec_SOURCES = \
 	src/resolve/test-dnssec.c \
-	src/resolve/resolved-dns-packet.c \
+	$(basic_dns_sources)
-	src/resolve/resolved-dns-packet.h \
-	src/resolve/resolved-dns-rr.c \
-	src/resolve/resolved-dns-rr.h \
-	src/resolve/resolved-dns-answer.c \
-	src/resolve/resolved-dns-answer.h \
-	src/resolve/resolved-dns-question.c \
-	src/resolve/resolved-dns-question.h \
-	src/resolve/resolved-dns-dnssec.c \
-	src/resolve/resolved-dns-dnssec.h \
-	src/resolve/dns-type.c \
-	src/resolve/dns-type.h
 
 test_dnssec_LDADD = \
 	libshared.la

src/resolve/resolved-dns-rr.c

@@ -1302,7 +1302,7 @@ int dns_resource_record_is_synthetic(DnsResourceRecord *rr) {
         return !r;
 }
 
-static void dns_resource_record_hash_func(const void *i, struct siphash *state) {
+void dns_resource_record_hash_func(const void *i, struct siphash *state) {
         const DnsResourceRecord *rr = i;
 
         assert(rr);

src/resolve/resolved-dns-rr.h

@@ -325,6 +325,8 @@ int dns_resource_record_is_synthetic(DnsResourceRecord *rr);
 DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i);
 bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b);
 
+void dns_resource_record_hash_func(const void *i, struct siphash *state);
+
 extern const struct hash_ops dns_resource_key_hash_ops;
 extern const struct hash_ops dns_resource_record_hash_ops;
 

src/resolve/test-dns-packet.c

@@ -0,0 +1,100 @@
+/***
+  This file is part of systemd
+
+  Copyright 2016 Zbigniew Jędrzejewski-Szmek
+
+  systemd 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.
+
+  systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <net/if.h>
+
+#include "alloc-util.h"
+#include "fileio.h"
+#include "macro.h"
+#include "log.h"
+#include "resolved-dns-packet.h"
+#include "resolved-dns-rr.h"
+#include "string-util.h"
+
+#define HASH_KEY SD_ID128_MAKE(d3,1e,48,90,4b,fa,4c,fe,af,9d,d5,a1,d7,2e,8a,b1)
+
+static uint64_t hash(DnsResourceRecord *rr) {
+        struct siphash state;
+
+        siphash24_init(&state, HASH_KEY.bytes);
+        dns_resource_record_hash_func(rr, &state);
+        return siphash24_finalize(&state);
+}
+
+static void test_packet_from_file(const char* filename, bool canonical) {
+        _cleanup_free_ char *data = NULL;
+        size_t data_size, packet_size, offset;
+
+        assert_se(read_full_file(filename, &data, &data_size) >= 0);
+        assert_se(data);
+        assert_se(data_size > 8);
+
+        log_info("============== %s %s==============", filename, canonical ? "canonical " : "");
+
+        for (offset = 0; offset < data_size; offset += 8 + packet_size) {
+                _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL, *p2 = NULL;
+                _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL, *rr2 = NULL;
+                const char *s, *s2;
+                uint64_t hash1, hash2;
+
+                packet_size = le64toh( *(uint64_t*)(data + offset) );
+                assert_se(packet_size > 0);
+                assert_se(offset + 8 + packet_size <= data_size);
+
+                assert_se(dns_packet_new(&p, DNS_PROTOCOL_DNS, 0) >= 0);
+
+                assert_se(dns_packet_append_blob(p, data + offset + 8, packet_size, NULL) >= 0);
+                assert_se(dns_packet_read_rr(p, &rr, NULL, NULL) >= 0);
+
+                s = dns_resource_record_to_string(rr);
+                assert_se(s);
+                puts(s);
+
+                hash1 = hash(rr);
+
+                assert_se(dns_resource_record_to_wire_format(rr, canonical) >= 0);
+
+                assert_se(dns_packet_new(&p2, DNS_PROTOCOL_DNS, 0) >= 0);
+                assert_se(dns_packet_append_blob(p2, rr->wire_format, rr->wire_format_size, NULL) >= 0);
+                assert_se(dns_packet_read_rr(p2, &rr2, NULL, NULL) >= 0);
+
+                s2 = dns_resource_record_to_string(rr);
+                assert_se(s2);
+                assert_se(streq(s, s2));
+
+                hash2 = hash(rr);
+                assert_se(hash1 == hash2);
+        }
+}
+
+int main(int argc, char **argv) {
+        int i;
+
+        log_parse_environment();
+
+        for (i = 1; i < argc; i++) {
+                test_packet_from_file(argv[i], false);
+                puts("");
+                test_packet_from_file(argv[i], true);
+                if (i + 1 < argc)
+                        puts("");
+        }
+
+        return EXIT_SUCCESS;
+}