src/resolve/test-dns-packet.c

   1 /***
   2   This file is part of systemd
   3
   4   Copyright 2016 Zbigniew Jędrzejewski-Szmek
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <net/if.h>
  21 #include <glob.h>
  22
  23 #include "alloc-util.h"
  24 #include "fileio.h"
  25 #include "glob-util.h"
  26 #include "log.h"
  27 #include "macro.h"
  28 #include "resolved-dns-packet.h"
  29 #include "resolved-dns-rr.h"
  30 #include "string-util.h"
  31 #include "strv.h"
  32
  33 #define HASH_KEY SD_ID128_MAKE(d3,1e,48,90,4b,fa,4c,fe,af,9d,d5,a1,d7,2e,8a,b1)
  34
  35 static uint64_t hash(DnsResourceRecord *rr) {
  36         struct siphash state;
  37
  38         siphash24_init(&state, HASH_KEY.bytes);
  39         dns_resource_record_hash_func(rr, &state);
  40         return siphash24_finalize(&state);
  41 }
  42
  43 static void test_packet_from_file(const char* filename, bool canonical) {
  44         _cleanup_free_ char *data = NULL;
  45         size_t data_size, packet_size, offset;
  46
  47         assert_se(read_full_file(filename, &data, &data_size) >= 0);
  48         assert_se(data);
  49         assert_se(data_size > 8);
  50
  51         log_info("============== %s %s==============", filename, canonical ? "canonical " : "");
  52
  53         for (offset = 0; offset < data_size; offset += 8 + packet_size) {
  54                 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL, *p2 = NULL;
  55                 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL, *rr2 = NULL;
  56                 const char *s, *s2;
  57                 uint64_t hash1, hash2;
  58
  59                 packet_size = le64toh( *(uint64_t*)(data + offset) );
  60                 assert_se(packet_size > 0);
  61                 assert_se(offset + 8 + packet_size <= data_size);
  62
  63                 assert_se(dns_packet_new(&p, DNS_PROTOCOL_DNS, 0) >= 0);
  64
  65                 assert_se(dns_packet_append_blob(p, data + offset + 8, packet_size, NULL) >= 0);
  66                 assert_se(dns_packet_read_rr(p, &rr, NULL, NULL) >= 0);
  67
  68                 s = dns_resource_record_to_string(rr);
  69                 assert_se(s);
  70                 puts(s);
  71
  72                 hash1 = hash(rr);
  73
  74                 assert_se(dns_resource_record_to_wire_format(rr, canonical) >= 0);
  75
  76                 assert_se(dns_packet_new(&p2, DNS_PROTOCOL_DNS, 0) >= 0);
  77                 assert_se(dns_packet_append_blob(p2, rr->wire_format, rr->wire_format_size, NULL) >= 0);
  78                 assert_se(dns_packet_read_rr(p2, &rr2, NULL, NULL) >= 0);
  79
  80                 s2 = dns_resource_record_to_string(rr);
  81                 assert_se(s2);
  82                 assert_se(streq(s, s2));
  83
  84                 hash2 = hash(rr);
  85                 assert_se(hash1 == hash2);
  86         }
  87 }
  88
  89 int main(int argc, char **argv) {
  90         int i, N;
  91         _cleanup_globfree_ glob_t g = {};
  92         _cleanup_strv_free_ char **globs = NULL;
  93         char **fnames;
  94
  95         log_parse_environment();
  96
  97         if (argc >= 2) {
  98                 N = argc - 1;
  99                 fnames = argv + 1;
 100         } else {
 101                 assert_se(glob(RESOLVE_TEST_DIR "/*.pkts", GLOB_NOSORT, NULL, &g) == 0);
 102                 N = g.gl_pathc;
 103                 fnames = g.gl_pathv;
 104         }
 105
 106         for (i = 0; i < N; i++) {
 107                 test_packet_from_file(fnames[i], false);
 108                 puts("");
 109                 test_packet_from_file(fnames[i], true);
 110                 if (i + 1 < N)
 111                         puts("");
 112         }
 113
 114         return EXIT_SUCCESS;
 115 }