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/* Copyright (c) 2002-2005 Sam Trenholme
*
* TERMS
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* This software is provided 'as is' with no guarantees of correctness or
* fitness for purpose.
*/
/* Simple testing DNS resolving client. This sends out simple
queries to DNS servers and prints out to stdout the replies
it receives.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include "../MaraDns.h"
/* All of the labels */
#include "askmara_labels_en.h"
#include "../dns/functions_dns.h"
int querynum;
int harderror(char *msg) {
printf("%s%s%s",L_HARD_ERROR,msg,L_NEWLINE);
exit(1);
}
void timeout() {
printf("Query failed on query number %d\n",querynum);
exit(1);
}
int main(int argc, char **argv) {
char *server_address = NULL;
struct sockaddr_in dns_udp;
int len_inet; /* Length */
int s; /* Socket */
js_string *outdata; /* Outgoing data */
js_string *indata, *uindata; /* Incoming data (uncompressed version) */
q_header header; /* header data */
q_question question;
int place,count;
/* Determine what the query string is */
if(argc < 2 || argc > 3)
harderror(L_USAGE);
/* Determine what IP address to bind to */
if(argc == 3)
server_address = argv[2];
else
server_address = "127.0.0.3";
if((indata = js_create(512,1)) == 0)
harderror(L_JS_CREATE_INDATA);
if((uindata = js_create(2048,1)) == 0)
harderror(L_JS_CREATE_UINDATA);
if((outdata = js_create(512,1)) == 0)
harderror(L_JS_CREATE_OUTDATA);
if((question.qname = js_create(512,1)) == 0)
harderror(L_JS_CREATE_QNAME);
/* Create a UDP client socket */
if((s = socket(AF_INET,SOCK_DGRAM,0)) == -1)
harderror(L_SOCKET);
/* Create a socket address to use with sendto() */
memset(&dns_udp,0,sizeof(dns_udp));
dns_udp.sin_family = AF_INET;
dns_udp.sin_port = htons(53);
if((dns_udp.sin_addr.s_addr = inet_addr(server_address)) == INADDR_NONE)
harderror(L_MAL_IP);
len_inet = sizeof(dns_udp);
/* Format a DNS request */
/* DNS header -> using dig defaults */
header.id = 6;
header.qr = 0;
header.opcode = 0;
header.aa = 0;
header.tc = 0;
header.rd = 1;
header.ra = 0;
header.z = 0;
header.rcode = 0;
header.qdcount = 1;
header.ancount = 0;
header.nscount = 0;
header.arcount = 0;
/* Create a DNS question , and put it in raw UDP format */
/* DNS question -> looking up an A record... */
question.qclass = 1; /* ...on the internet */
if(js_qstr2js(question.qname,argv[1]) == JS_ERROR)
harderror(L_INVALID_Q); /* Invalid query */
/* Make 'Aexample.com.' raw UDP data */
place = hname_2rfc1035(question.qname);
if(place == JS_ERROR)
harderror(L_INVALID_DQ); /* Invalid form of domain query */
question.qtype = place;
/* Make a string containing the RAW UDP query */
make_hdr(&header,outdata);
make_question(&question,outdata);
/* Create an timeout alarm */
signal(SIGALRM,timeout);
alarm(10); /* 10 seconds */
/* The core of the stress test for the server */
for(querynum = 0; querynum < 50000; querynum++) {
/* Send out a DNS request */
if(sendto(s,outdata->string,outdata->unit_count,0,
(struct sockaddr *)&dns_udp,len_inet) < 0)
harderror(L_UDP_NOSEND); /* Unable to send UDP packet */
/* Wait for a reply from the DNS server */
if((count = recvfrom(s,indata->string,indata->max_count,0,
(struct sockaddr *)&dns_udp,
(socklen_t *)&len_inet)) < 0)
harderror(L_DNS_R_ERROR); /* Problem getting DNS server response */
if(querynum % 1000 == 0)
printf("%d queries performed\n",querynum);
}
return 0;
}
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