diff options
Diffstat (limited to 'support')
| -rw-r--r-- | support/resolv_test.c | 56 | ||||
| -rw-r--r-- | support/resolv_test.h | 11 |
2 files changed, 64 insertions, 3 deletions
diff --git a/support/resolv_test.c b/support/resolv_test.c index 49ed210191..5c5a46353d 100644 --- a/support/resolv_test.c +++ b/support/resolv_test.c @@ -429,6 +429,7 @@ struct query_info char qname[MAXDNAME]; uint16_t qclass; uint16_t qtype; + struct resolv_edns_info edns; }; /* Update *INFO from the specified DNS packet. */ @@ -436,10 +437,26 @@ static void parse_query (struct query_info *info, const unsigned char *buffer, size_t length) { - if (length < 12) + HEADER hd; + _Static_assert (sizeof (hd) == 12, "DNS header size"); + if (length < sizeof (hd)) FAIL_EXIT1 ("malformed DNS query: too short: %zu bytes", length); - - int ret = dn_expand (buffer, buffer + length, buffer + 12, + memcpy (&hd, buffer, sizeof (hd)); + + if (ntohs (hd.qdcount) != 1) + FAIL_EXIT1 ("malformed DNS query: wrong question count: %d", + (int) ntohs (hd.qdcount)); + if (ntohs (hd.ancount) != 0) + FAIL_EXIT1 ("malformed DNS query: wrong answer count: %d", + (int) ntohs (hd.ancount)); + if (ntohs (hd.nscount) != 0) + FAIL_EXIT1 ("malformed DNS query: wrong authority count: %d", + (int) ntohs (hd.nscount)); + if (ntohs (hd.arcount) > 1) + FAIL_EXIT1 ("malformed DNS query: wrong additional count: %d", + (int) ntohs (hd.arcount)); + + int ret = dn_expand (buffer, buffer + length, buffer + sizeof (hd), info->qname, sizeof (info->qname)); if (ret < 0) FAIL_EXIT1 ("malformed DNS query: cannot uncompress QNAME"); @@ -457,6 +474,37 @@ parse_query (struct query_info *info, memcpy (&qtype_qclass, buffer + 12 + ret, sizeof (qtype_qclass)); info->qclass = ntohs (qtype_qclass.qclass); info->qtype = ntohs (qtype_qclass.qtype); + + memset (&info->edns, 0, sizeof (info->edns)); + if (ntohs (hd.arcount) > 0) + { + /* Parse EDNS record. */ + struct __attribute__ ((packed, aligned (1))) + { + uint8_t root; + uint16_t rtype; + uint16_t payload; + uint8_t edns_extended_rcode; + uint8_t edns_version; + uint16_t flags; + uint16_t rdatalen; + } rr; + _Static_assert (sizeof (rr) == 11, "EDNS record size"); + + if (remaining < 4 + sizeof (rr)) + FAIL_EXIT1 ("mailformed DNS query: no room for EDNS record"); + memcpy (&rr, buffer + 12 + ret + 4, sizeof (rr)); + if (rr.root != 0) + FAIL_EXIT1 ("malformed DNS query: invalid OPT RNAME: %d\n", rr.root); + if (rr.rtype != htons (41)) + FAIL_EXIT1 ("malformed DNS query: invalid OPT type: %d\n", + ntohs (rr.rtype)); + info->edns.active = true; + info->edns.extended_rcode = rr.edns_extended_rcode; + info->edns.version = rr.edns_version; + info->edns.flags = ntohs (rr.flags); + info->edns.payload_size = ntohs (rr.payload); + } } @@ -586,6 +634,7 @@ server_thread_udp_process_one (struct resolv_test *obj, int server_index) .query_length = length, .server_index = server_index, .tcp = false, + .edns = qinfo.edns, }; struct resolv_response_builder *b = response_builder_allocate (query, length); obj->config.response_callback @@ -821,6 +870,7 @@ server_thread_tcp_client (void *arg) .query_length = query_length, .server_index = closure->server_index, .tcp = true, + .edns = qinfo.edns, }; struct resolv_response_builder *b = response_builder_allocate (query_buffer, query_length); diff --git a/support/resolv_test.h b/support/resolv_test.h index 7a9f1f7ae8..6498751569 100644 --- a/support/resolv_test.h +++ b/support/resolv_test.h @@ -25,6 +25,16 @@ __BEGIN_DECLS +/* Information about EDNS properties of a DNS query. */ +struct resolv_edns_info +{ + bool active; + uint8_t extended_rcode; + uint8_t version; + uint16_t flags; + uint16_t payload_size; +}; + /* This struct provides context information when the response callback specified in struct resolv_redirect_config is invoked. */ struct resolv_response_context @@ -33,6 +43,7 @@ struct resolv_response_context size_t query_length; int server_index; bool tcp; + struct resolv_edns_info edns; }; /* This opaque struct is used to construct responses from within the |