From b6574898519ef89d5481ad677347f0630c877561 Mon Sep 17 00:00:00 2001
From: Joel Grunbaum <joelgrun@gmail.com>
Date: Tue, 20 Oct 2020 13:29:13 +0000
Subject: [PATCH] Specify number of serves and hosts, test and sort servers
---
main.c | 113 +++++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 82 insertions(+), 31 deletions(-)
diff --git a/main.c b/main.c
index 15ea1d1..3db7eee 100644
--- a/main.c
+++ b/main.c
@@ -1,44 +1,95 @@
#include <stdio.h>
#include <stdlib.h>
+#include <unistd.h>
#include <string.h>
-#include <sys/socket.h>
-#include <arpa/inet.h>
-#include <netint/in.h>
-//#include <netdb.h>
-#include <sys/time.h>
+#include <time.h>
+#include "dns.h"
+#include "servers.h"
+#include "slist.h"
-// DNS resource records
-#define T_A 1 // IPv4 address
-#define T_NS // Name Server
-#define T_CNAME 5 // Cannonical name
-#define T_SOA 6 // State of Authority
-#define T_PTR 12 // Domain name pointer
-#define T_MX 15 // Mail exchange
+#define NUM_TESTS 10
-struct DNS_QUERY
-{
- unsigned short id; //ID number
- unsigned char rd :1; //recursion
- unsigned char aa :1; //truncated message
- unsigned char opcode :4; //message purpose
- unsigned char qr :1; //query/response
- unsigned char rcode :4; //response code
-
-}
+int test_dns(struct dns_list *dnss, struct hosts_list *hosts, int num_hosts, int num_tests);
+struct timespec test_server(struct dns_list *dns, struct hosts_list *hosts, int num_hosts, int num_tests);
int main(int argc, char** argv)
{
-
+ int option, num_hosts = 0, added_hosts = 0, num_tests = NUM_TESTS;
+ struct hosts_list *servers_hosts = NULL;
+ struct dns_list *servers_dns = NULL;
+ while((option = getopt(argc, argv, "s:h:t:n:")) != -1) {
+ switch (option) {
+ case 's': //server to use
+ add_dns_server(&servers_dns, optarg);
+ break;
+ case 'h': //hostname to search
+ add_hosts_server(&servers_hosts, optarg);
+ added_hosts++;
+ break;
+ case 't': //set number of hosts to test
+ num_hosts = atoi(optarg);
+ break;
+ case 'n': //number of tests to perform
+ num_tests = atoi(optarg);
+ break;
+ case '?':
+ default:
+ printf("Error: invalid option -%c\n", optopt);
+ free_dns_list(&servers_dns);
+ free_hosts_list(&servers_hosts);
+ exit(1);
+ }
+ }
+ if (num_hosts == 0 || num_hosts > NUM_HOSTNAMES+added_hosts) {
+ num_hosts = NUM_HOSTNAMES + added_hosts;
+ }
+ for (int i = added_hosts; i < num_hosts; i++) {
+ add_hosts_server(&servers_hosts, HOSTNAMES[i-added_hosts]);
+ }
+ for (int i = 0; i < NUM_DNS; i++) {
+ add_dns_server(&servers_dns, DNS_SERVERS[i]);
+ }
+ test_dns(servers_dns, servers_hosts, num_hosts, num_tests);
+ sort_servers(&servers_dns);
+ print_servers(servers_dns);
+ free_dns_list(&servers_dns);
+ free_hosts_list(&servers_hosts);
+ return 0;
}
-void resolve(char* hostname, char* dns_ip)
+int test_dns(struct dns_list *dnss, struct hosts_list *hosts, int num_hosts, int num_tests)
{
- int s;
- struct sockaddr_in dest;
+ struct dns_list *curr = dnss;
+ while (curr) {
+ test_server(curr, hosts, num_hosts, num_tests);
+ curr = curr->next;
+ }
+ return 0;
+}
- s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
- dest.sin_family = AF_INET;
- dest.sin_port = htons(53);
- dest.sin_addr.s_addr = inet_addr(dns_ip);
-
+struct timespec test_server(struct dns_list *dns, struct hosts_list *hosts, int num_hosts, int num_tests)
+{
+ unsigned long long avg_nsec = 0;
+ dns->time.tv_sec = 0; dns->time.tv_nsec = 0;
+ for (int i = 0; i < num_tests; i++) {
+ struct hosts_list *curr = hosts;
+ while (curr) {
+ struct timespec run;
+ unsigned char buf[65536];
+ run = resolve(buf, curr->server, dns->server, T_A);
+ if (run.tv_sec == -1)
+ continue;
+ dns->time.tv_sec += run.tv_sec;
+ dns->time.tv_nsec += run.tv_nsec;
+ if (dns->time.tv_nsec >= 1000000000) {
+ dns->time.tv_sec += 1;
+ dns->time.tv_nsec -= 1000000000;
+ }
+ curr = curr->next;
+ }
+ }
+ avg_nsec = 1000000000*(dns->time.tv_sec%(num_hosts*num_tests))+dns->time.tv_nsec;
+ dns->time.tv_sec = dns->time.tv_sec/(num_hosts*num_tests);
+ dns->time.tv_nsec = avg_nsec/(num_hosts*num_tests);
+ return dns->time;
}
--
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