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dnstester.cpp
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dnstester.cpp
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/* dns64perf++ - C++14 DNS64 performance tester
* Based on dns64perf by Gabor Lencse <lencse@sze.hu>
* (http://ipv6.tilb.sze.hu/dns64perf/)
* Copyright (C) 2017 Daniel Bakai <bakaid@kszk.bme.hu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include "dnstester.h"
#include "spin_sleep.hpp"
#include <arpa/inet.h>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <iostream>
#include <limits.h>
#include <net/if.h>
#include <sstream>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
TestException::TestException(std::string what) : what_{what} {}
const char *TestException::what() const noexcept { return what_.c_str(); }
DnsQuery::DnsQuery()
: received_{false}, answered_{false}, rtt_{std::chrono::nanoseconds{-1}} {}
DnsTester::DnsTester(
struct in6_addr server_addr, uint16_t port, uint32_t ip, uint8_t netmask,
uint32_t num_req, uint32_t num_burst, uint32_t num_thread,
uint32_t thread_id,
const std::chrono::time_point<std::chrono::high_resolution_clock>
&test_start_time,
std::chrono::nanoseconds burst_delay, struct timeval timeout)
: ip_{ip}, netmask_{netmask}, num_req_{num_req / num_thread},
num_burst_{num_burst}, num_thread_{num_thread}, thread_id_{thread_id},
test_start_time_{test_start_time}, burst_delay_{burst_delay}, num_sent_{
0} {
/* Set timeout */
timeout_ = timeout;
/* Calculate offset */
num_offset_ = thread_id_ * num_req_;
/* Fill server sockaddr structure */
memset(&server_, 0x00, sizeof(server_));
server_.sin6_family = AF_INET6;
server_.sin6_addr = server_addr;
server_.sin6_port = htons(port);
/* Create socket */
int sockfd;
if ((sockfd = ::socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
std::stringstream ss;
ss << "Cannot create socket: " << strerror(errno);
throw TestException{ss.str()};
}
sock_ = Socket{sockfd};
/* Bind socket */
struct sockaddr_in6 local_addr;
memset(&local_addr, 0x00, sizeof(local_addr));
local_addr.sin6_family = AF_INET6; // IPv6
local_addr.sin6_addr = in6addr_any; // To any valid IP address
local_addr.sin6_port = htons(0); // Get a random port
if (::bind(sock_, reinterpret_cast<struct sockaddr *>(&local_addr),
sizeof(local_addr)) == -1) {
std::stringstream ss;
ss << "Unable to bind socket: " << strerror(errno);
throw TestException{ss.str()};
}
/* Set socket timeout */
if (::setsockopt(sock_, SOL_SOCKET, SO_RCVTIMEO,
reinterpret_cast<const void *>(&timeout_),
sizeof(timeout_))) {
throw TestException("Cannot set timeout: setsockopt failed");
}
/* Preallocate the test queries */
tests_.reserve(num_req_);
/* Create the test queries */
for (uint32_t i = 0; i < num_req_; i++) {
tests_.push_back(DnsQuery{});
}
/* Creating the base query */
memset(query_data_, 0x00, sizeof(query_data_));
/* Filling the header */
DNSHeader *header = reinterpret_cast<DNSHeader *>(query_data_);
header->id(0);
header->qr(0);
header->opcode(DNSHeader::OpCode::Query);
header->aa(false);
header->tc(false);
header->rd(true);
header->ra(false);
header->rcode(DNSHeader::RCODE::NoError);
header->qdcount(1);
header->ancount(0);
header->nscount(0);
header->arcount(0);
/* Creating the question*/
uint8_t *question = query_data_ + sizeof(DNSHeader);
/* Creating the domain name */
char addr[64];
char query_addr[512];
snprintf(addr, sizeof(addr), dns64_addr_format_string, 0, 0, 0, 0);
snprintf(query_addr, sizeof(query_addr), "%s.%s.", addr, dns64_addr_domain);
/* Convering the domain name to DNS Name format */
char *label = strtok(query_addr, ".");
while (label != nullptr) {
*question = strlen(label);
question += 1;
memcpy(question, label, strlen(label));
question += strlen(label);
label = strtok(nullptr, ".");
}
*question = 0x00;
question += 1;
/* Setting the query type and class */
*reinterpret_cast<uint16_t *>(question) = htons(QType::AAAA);
question += sizeof(uint16_t);
*reinterpret_cast<uint16_t *>(question) = htons(QClass::IN);
question += sizeof(uint16_t);
/* Constructing the DnsQuery */
size_t len = (size_t)(question - query_data_);
query_ = std::unique_ptr<DNSPacket>{
new DNSPacket{query_data_, len, sizeof(query_data_)}};
}
void DnsTester::test() {
for (uint32_t i = 0; i < num_burst_; i++) {
/* Get query store */
DnsQuery &query = tests_[num_sent_];
/* Modify the base query */
/* Modify the label */
char label[64];
uint32_t ip = ip_ | (num_sent_ + num_offset_);
snprintf(label, sizeof(label), dns64_addr_format_string, (ip >> 24) & 0xff,
(ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff);
memcpy(query_->labels_[0].begin_ + 1, label, strlen(label));
/* Modify the Transaction ID */
query_->header_->id((num_sent_ + num_offset_) % (1 << 16));
/* Send the query */
if (::sendto(sock_, reinterpret_cast<const void *>(query_->begin_),
query_->len_, 0,
reinterpret_cast<const struct sockaddr *>(&server_),
sizeof(server_)) != query_->len_) {
std::cerr << "Can't send packet." << std::endl;
}
/* Store the time */
query.time_sent_ = std::chrono::high_resolution_clock::now();
m_.lock();
num_sent_++;
m_.unlock();
}
}
void DnsTester::start() {
/* Starting test packet sending */
timer_ = std::unique_ptr<Timer>{
new Timer{"Sender " + std::to_string(thread_id_),
[&]() { spinsleep::sleep_until(test_start_time_); },
std::bind(&DnsTester::test, this), burst_delay_,
(size_t)(num_req_ / num_burst_)}};
timer_->start();
/* Receiving answers */
struct sockaddr_in6 sender;
socklen_t sender_len;
ssize_t recvlen;
uint8_t answer_data[UDP_MAX_LEN];
bool continue_receiving;
std::chrono::time_point<std::chrono::high_resolution_clock> receive_until;
continue_receiving = true;
while (continue_receiving ||
std::chrono::high_resolution_clock::now() <= receive_until) {
m_.lock();
size_t remaining = num_req_ - num_sent_;
m_.unlock();
if (remaining == 0) {
continue_receiving = false;
receive_until = std::chrono::high_resolution_clock::now() +
std::chrono::seconds{timeout_.tv_sec} +
std::chrono::microseconds{timeout_.tv_usec};
}
memset(&sender, 0x00, sizeof(sender));
sender_len = sizeof(sender);
if ((recvlen = ::recvfrom(sock_, answer_data, sizeof(answer_data), 0,
reinterpret_cast<struct sockaddr *>(&sender),
&sender_len)) > 0) {
/* Get the time of the receipt */
std::chrono::high_resolution_clock::time_point time_received =
std::chrono::high_resolution_clock::now();
/* Test whether the answer came from the DUT */
if (memcmp(reinterpret_cast<const void *>(&sender.sin6_addr),
reinterpret_cast<const void *>(&server_.sin6_addr),
sizeof(struct in6_addr)) != 0 ||
sender.sin6_port != server_.sin6_port) {
char sender_text[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, reinterpret_cast<const void *>(&sender.sin6_addr),
sender_text, sizeof(sender_text));
std::stringstream ss;
ss << "Received packet from other host than the DUT: [" << sender_text
<< "]:" << ntohs(sender.sin6_port);
throw TestException{ss.str()};
}
/* Parse the answer */
DNSPacket answer{answer_data, (size_t)recvlen, sizeof(answer_data)};
/* Test whether the query is valid */
if (answer.header_->qdcount() < 1) {
/* It is invalid, continue */
continue;
}
/* Find the corresponding query */
char label[64];
uint32_t ip;
uint8_t temp[4];
strncpy(label, (const char *)answer.labels_[0].begin_ + 1,
answer.labels_[0].length());
label[answer.labels_[0].length()] = '\0';
if (sscanf(label, dns64_addr_format_string, temp, temp + 1, temp + 2,
temp + 3) != 4) {
throw TestException{"Invalid question."};
}
ip = (temp[0] << 24) | (temp[1] << 16) | (temp[2] << 8) | temp[3];
auto fqdn = ip & (((uint64_t)1 << (32 - netmask_)) - 1);
if (fqdn < num_offset_) {
throw TestException{"Unexpected FQDN in question: too small."};
} else if (fqdn >= (num_offset_ + num_req_)) {
throw TestException{"Unexpected FQDN in question: too large."};
}
DnsQuery &query = tests_[fqdn - num_offset_];
/* Set the received flag true */
query.received_ = true;
/* Set the received timestamp */
query.time_received_ = time_received;
/* Check whether there is an answer */
query.answered_ = answer.header_->qr() == 1 &&
answer.header_->rcode() == DNSHeader::RCODE::NoError &&
answer.header_->ancount() > 0;
} else {
/* If the error is not caused by timeout, there is something wrong */
if (errno != EWOULDBLOCK) {
std::stringstream ss;
ss << "Error in recvfrom: " << strerror(errno);
throw TestException{ss.str()};
}
}
}
timer_->stop();
for (auto &query : tests_) {
/* Calculate the Round-Trip-Time */
if (query.received_) {
query.rtt_ = std::chrono::duration_cast<std::chrono::nanoseconds>(
query.time_received_ - query.time_sent_);
}
/* Adjust answer validity with timeout */
query.answered_ =
query.answered_ &&
query.rtt_ < (std::chrono::seconds{timeout_.tv_sec} +
std::chrono::microseconds{timeout_.tv_usec});
}
}
DnsTesterAggregator::DnsTesterAggregator(
const std::vector<std::unique_ptr<DnsTester>> &dns_testers)
: dns_testers_(dns_testers) {}
void DnsTesterAggregator::display() {
uint32_t num_received, num_answered, num_total;
double average, standard_deviation;
num_total = 0;
num_received = 0;
num_answered = 0;
/* Number of received and answered queries */
for (const auto &tester : dns_testers_) {
for (const auto &query : tester->tests_) {
num_total++;
if (query.received_) {
num_received++;
}
if (query.answered_) {
num_answered++;
}
}
}
/* Average */
average = 0;
for (const auto &tester : dns_testers_) {
for (const auto &query : tester->tests_) {
if (query.received_) {
average += (double)query.rtt_.count() / num_received;
}
}
}
/* Standard deviation */
standard_deviation = 0;
for (const auto &tester : dns_testers_) {
for (auto &query : tester->tests_) {
if (query.received_) {
standard_deviation += pow(query.rtt_.count() - average, 2.0);
}
}
}
standard_deviation = sqrt(standard_deviation / num_received);
/* Print results */
printf("Sent queries: %u\n", num_total);
printf("Received answers: %u (%.02f%%)\n", num_received,
((double)num_received / num_total) * 100);
printf("Valid answers: %u (%.02f%%)\n", num_answered,
((double)num_answered / num_total) * 100);
printf("Average round-trip time: %.02f ms\n", average / 1000000.0);
printf("Standard deviation of the round-trip time: %.02f ms\n",
standard_deviation / 1000000.0);
}
void DnsTesterAggregator::write(const char *filename) {
const auto &first_tester = dns_testers_[0];
char server[INET6_ADDRSTRLEN];
/* Convert server address to string */
if (inet_ntop(
AF_INET6,
reinterpret_cast<const void *>(&first_tester->server_.sin6_addr),
server, sizeof(server)) == NULL) {
std::stringstream ss;
ss << "Bad server address: " << strerror(errno);
throw TestException{ss.str()};
}
/* Open file */
FILE *fp;
if ((fp = fopen(filename, "w")) == nullptr) {
throw TestException{"Can't open file"};
}
/* Write header */
fprintf(fp, "%s\n", "dns64perf++ test parameters");
fprintf(fp, "server: %s\n", server);
fprintf(fp, "port: %hu\n", ntohs(first_tester->server_.sin6_port));
fprintf(fp, "number of requests: %u\n",
first_tester->num_req_ * first_tester->num_thread_);
fprintf(fp, "burst size: %u\n", first_tester->num_burst_);
fprintf(fp, "number of threads: %u\n", first_tester->num_thread_);
fprintf(fp, "delay between bursts: %lu ns\n\n",
first_tester->burst_delay_.count());
fprintf(
fp,
"query;thread id;tsent [ns];treceived [ns];received;answered;rtt [ns]\n");
/* Write queries */
char addr[64];
char query_addr[512];
uint32_t ip;
for (const auto &tester : dns_testers_) {
int n = 0;
for (const auto &query : tester->tests_) {
ip = tester->ip_ | (tester->num_offset_ + n++);
snprintf(addr, sizeof(addr), dns64_addr_format_string, (ip >> 24) & 0xff,
(ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff);
snprintf(query_addr, sizeof(query_addr), "%s.%s.", addr,
dns64_addr_domain);
fprintf(fp, "%s;%u;%lu;%lu;%d;%d;%ld\n", query_addr, tester->thread_id_,
std::chrono::duration_cast<std::chrono::nanoseconds>(
query.time_sent_.time_since_epoch())
.count(),
std::chrono::duration_cast<std::chrono::nanoseconds>(
query.time_received_.time_since_epoch())
.count(),
query.received_, query.answered_, query.rtt_.count());
}
}
fclose(fp);
}