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Bonjour: Fix: Set Query ID to zero, no ID checking in responses. Fix #1864

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This commit is contained in:
Vojtech Kral 2019-03-01 15:25:07 +01:00
parent 2ddd2ed4c7
commit 96d09ce0ad
1 changed files with 16 additions and 29 deletions
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45
src/slic3r/Utils/Bonjour.cpp
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@ -5,7 +5,6 @@
#include <array>
#include <vector>
#include <string>
#include <random>
#include <thread>
#include <boost/optional.hpp>
#include <boost/system/error_code.hpp>
@ -34,6 +33,9 @@ namespace Slic3r {
// the implementations has been tested with AFL.
// Relevant RFC: https://www.ietf.org/rfc/rfc6762.txt
struct DnsName: public std::string
{
enum
@ -387,7 +389,7 @@ struct DnsMessage
DnsSDMap sdmap;
static optional<DnsMessage> decode(const std::vector<char> &buffer, optional<uint16_t> id_wanted = boost::none)
static optional<DnsMessage> decode(const std::vector<char> &buffer)
{
const auto size = buffer.size();
if (size < DnsHeader::SIZE + DnsQuestion::MIN_SIZE || size > MAX_SIZE) {
@ -397,10 +399,6 @@ struct DnsMessage
DnsMessage res;
res.header = DnsHeader::decode(buffer);
if (id_wanted && *id_wanted != res.header.id) {
return boost::none;
}
if (res.header.qdcount > 1 || res.header.ancount > MAX_ANS) {
return boost::none;
}
@ -472,16 +470,12 @@ struct BonjourRequest
static const asio::ip::address_v4 MCAST_IP4;
static const uint16_t MCAST_PORT;
uint16_t id;
std::vector<char> data;
static optional<BonjourRequest> make(const std::string &service, const std::string &protocol);
private:
BonjourRequest(uint16_t id, std::vector<char> &&data) :
id(id),
data(std::move(data))
{}
BonjourRequest(std::vector<char> &&data) : data(std::move(data)) {}
};
const asio::ip::address_v4 BonjourRequest::MCAST_IP4{0xe00000fb};
@ -493,22 +487,15 @@ optional<BonjourRequest> BonjourRequest::make(const std::string &service, const
return boost::none;
}
std::random_device dev;
std::uniform_int_distribution<uint16_t> dist;
uint16_t id = dist(dev);
uint16_t id_big = endian::native_to_big(id);
const char *id_char = reinterpret_cast<char*>(&id_big);
std::vector<char> data;
data.reserve(service.size() + 18);
// Add the transaction ID
data.push_back(id_char[0]);
data.push_back(id_char[1]);
// Add metadata
static const unsigned char rq_meta[] = {
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
0x00, 0x00, // Query ID (zero for mDNS)
0x00, 0x00, // Flags
0x00, 0x01, // One query
0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // Zero Answer, Authority, and Additional RRs
};
std::copy(rq_meta, rq_meta + sizeof(rq_meta), std::back_inserter(data));
@ -522,11 +509,14 @@ optional<BonjourRequest> BonjourRequest::make(const std::string &service, const
// Add the rest of PTR record
static const unsigned char ptr_tail[] = {
0x05, 0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x00, 0x00, 0x0c, 0x00, 0xff,
0x05, // length of "label"
0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x00, // "label" string and terminator
0x00, 0x0c, // Type PTR
0x00, 0xff, // Class ANY
};
std::copy(ptr_tail, ptr_tail + sizeof(ptr_tail), std::back_inserter(data));
return BonjourRequest(id, std::move(data));
return BonjourRequest(std::move(data));
}
@ -539,7 +529,6 @@ struct Bonjour::priv
const std::string service_dn;
unsigned timeout;
unsigned retries;
uint16_t rq_id;
std::vector<char> buffer;
std::thread io_thread;
@ -558,8 +547,7 @@ Bonjour::priv::priv(std::string service, std::string protocol) :
protocol(std::move(protocol)),
service_dn((boost::format("_%1%._%2%.local") % this->service % this->protocol).str()),
timeout(10),
retries(1),
rq_id(0)
retries(1)
{
buffer.resize(DnsMessage::MAX_SIZE);
}
@ -585,7 +573,7 @@ void Bonjour::priv::udp_receive(udp::endpoint from, size_t bytes)
}
buffer.resize(bytes);
const auto dns_msg = DnsMessage::decode(buffer, rq_id);
const auto dns_msg = DnsMessage::decode(buffer);
if (dns_msg) {
asio::ip::address ip = from.address();
if (dns_msg->rr_a) { ip = dns_msg->rr_a->ip; }
@ -629,7 +617,6 @@ void Bonjour::priv::lookup_perform()
}
auto self = this;
rq_id = brq->id;
try {
boost::asio::io_service io_service;