/* dns_t_resolve - test resolving names */

#include <stdio.h>

#include "sock.h"

#include "dns.h"

#include "memutil.h"

#include "defutil.h"

int

main(int argc, char **argv) {

char *ns, *hostname;

sock_t sock;

struct sockaddr_in addr;

sockaddrlen_t addrlen;

char buf_query[4096];

char buf_reply[4096];

char buf_out[4096];

char buf[4096];

dns_rr_t hosts[100];

int i, n, err=-1;

int id;

dns_t dns_reply;

do {

debug_init(DEBUG_INFO, 0, 0);

sock_init();

if( argc <= 2 ) {

fprintf(stderr, "USAGE: %s nameserver hostname\n", argv[0]);

break;

}

ns = argv[1];

hostname = argv[2];

i = dns_resolve_query(buf_query, sizeof(buf_query), hostname, 977);

assertb(i>=0);

memdump(buf_out, sizeof(buf_out), buf_query, i);

fprintf(stderr, "query: len=%d\n%s\n", i, buf_out);

/* send the query to ns*/

sock = socket(PF_INET, SOCK_DGRAM, 0);

assertb_sockerr(sock>=0);

addrlen = iaddr_pack(&addr, inet_resolve(ns), 53);

assertb(addrlen>0);

n = sendto(sock, buf_query, i, 0,

(struct sockaddr*)&addr, addrlen);

assertb_sockerr(n==i);

/* receive a response */

n = recvfrom(sock, buf_reply, sizeof(buf_reply), 0,

(struct sockaddr*)&addr, &addrlen);

assertb_sockerr(n>0);

debug(DEBUG_INFO,

("recvfrom raw query from %s\n%s\n"

, netpkt_ntoa(addr.sin_addr.s_addr, 0)

, memdump(buf_out, sizeof(buf_out), buf_reply, n)

));

dns_init(&dns_reply, buf_reply, n);

dns_pack(&dns_reply, PACK_NET2HOST);

debug(DEBUG_INFO,

("dns answer %s\n"

,dns_fmt(&dns_reply, buf, sizeof(buf))));

n = dns_resolve_reply(buf_reply, n, &id, hosts, NELTS(hosts));

for(i=0; i<n; i++) {

fprintf(stderr, "hosts[%d]: %s=%s\n", i,

hosts[i].name, netpkt_ntoa(hosts[i].rdata.a.addr, 0));

}

} while(0);

}