static void callback(void *arg, int status, int timeouts,
unsigned char *abuf, int alen)
{
char *name = (char *) arg;
int id, qr, opcode, aa, tc, rd, ra, rcode;
unsigned int qdcount, ancount, nscount, arcount, i;
const unsigned char *aptr;
(void) timeouts;
/* Display the query name if given. */
if (name)
printf("Answer for query %s:\n", name);
/* Display an error message if there was an error, but only stop if
* we actually didn't get an answer buffer.
*/
if (status != ARES_SUCCESS)
{
printf("%s\n", ares_strerror(status));
if (!abuf)
return;
}
/* Won't happen, but check anyway, for safety. */
if (alen < HFIXEDSZ)
return;
/* Parse the answer header. */
id = DNS_HEADER_QID(abuf);
qr = DNS_HEADER_QR(abuf);
opcode = DNS_HEADER_OPCODE(abuf);
aa = DNS_HEADER_AA(abuf);
tc = DNS_HEADER_TC(abuf);
rd = DNS_HEADER_RD(abuf);
ra = DNS_HEADER_RA(abuf);
rcode = DNS_HEADER_RCODE(abuf);
qdcount = DNS_HEADER_QDCOUNT(abuf);
ancount = DNS_HEADER_ANCOUNT(abuf);
nscount = DNS_HEADER_NSCOUNT(abuf);
arcount = DNS_HEADER_ARCOUNT(abuf);
/* Display the answer header. */
printf("id: %d\n", id);
printf("flags: %s%s%s%s%s\n",
qr ? "qr " : "",
aa ? "aa " : "",
tc ? "tc " : "",
rd ? "rd " : "",
ra ? "ra " : "");
printf("opcode: %d %s\n", opcode, opcodes[opcode]);
printf("rcode: %d %s\n", rcode, rcodes[rcode]);
printf("qdcount: %d\n", qdcount);
printf("ancount: %d\n", ancount);
printf("nscount: %d\n", nscount);
printf("arcount: %d\n", arcount);
/* Display the questions. */
printf("Questions:\n");
aptr = abuf + HFIXEDSZ;
for (i = 0; i < qdcount; i++)
{
aptr = display_question(aptr, abuf, alen);
if (aptr == NULL)
return;
}
/* Display the answers. */
printf("Answers:\n");
for (i = 0; i < ancount; i++)
{
aptr = display_rr(aptr, abuf, alen);
if (aptr == NULL)
return;
}
/* Display the NS records. */
printf("NS records:\n");
for (i = 0; i < nscount; i++)
{
aptr = display_rr(aptr, abuf, alen);
if (aptr == NULL)
return;
}
/* Display the additional records. */
printf("Additional records:\n");
for (i = 0; i < arcount; i++)
{
aptr = display_rr(aptr, abuf, alen);
if (aptr == NULL)
return;
}
}
void dns_detail_callback(void *arg, int status, int timeouts, unsigned char *abuf, int alen)
{
int id, qr, opcode, aa, tc, rd, ra, rcode;
unsigned int qdcount, ancount, nscount, arcount, i;
const unsigned char *aptr;
dns_resp_t *response = (dns_resp_t *) arg;
clearstrbuffer(response->msgbuf);
response->msgstatus = status;
/*
* Display an error message if there was an error, but only stop if
* we actually didn't get an answer buffer.
*/
switch (status) {
case ARES_SUCCESS:
break;
case ARES_ENODATA:
addtobuffer(response->msgbuf, "No data returned from server\n");
if (!abuf) return;
break;
case ARES_EFORMERR:
addtobuffer(response->msgbuf, "Server could not understand query\n");
if (!abuf) return;
break;
case ARES_ESERVFAIL:
addtobuffer(response->msgbuf, "Server failed\n");
if (!abuf) return;
break;
case ARES_ENOTFOUND:
addtobuffer(response->msgbuf, "Name not found\n");
if (!abuf) return;
break;
case ARES_ENOTIMP:
addtobuffer(response->msgbuf, "Not implemented\n");
if (!abuf) return;
break;
case ARES_EREFUSED:
addtobuffer(response->msgbuf, "Server refused query\n");
if (!abuf) return;
break;
case ARES_EBADNAME:
addtobuffer(response->msgbuf, "Invalid name in query\n");
if (!abuf) return;
break;
case ARES_ETIMEOUT:
addtobuffer(response->msgbuf, "Timeout\n");
if (!abuf) return;
break;
case ARES_ECONNREFUSED:
addtobuffer(response->msgbuf, "Server unavailable\n");
if (!abuf) return;
break;
case ARES_ENOMEM:
addtobuffer(response->msgbuf, "Out of memory\n");
if (!abuf) return;
break;
case ARES_EDESTRUCTION:
addtobuffer(response->msgbuf, "Timeout (channel destroyed)\n");
if (!abuf) return;
break;
default:
addtobuffer(response->msgbuf, "Undocumented ARES return code\n");
if (!abuf) return;
break;
}
/* Won't happen, but check anyway, for safety. */
if (alen < HFIXEDSZ) return;
/* Parse the answer header. */
id = DNS_HEADER_QID(abuf);
qr = DNS_HEADER_QR(abuf);
opcode = DNS_HEADER_OPCODE(abuf);
aa = DNS_HEADER_AA(abuf);
tc = DNS_HEADER_TC(abuf);
rd = DNS_HEADER_RD(abuf);
ra = DNS_HEADER_RA(abuf);
rcode = DNS_HEADER_RCODE(abuf);
qdcount = DNS_HEADER_QDCOUNT(abuf);
ancount = DNS_HEADER_ANCOUNT(abuf);
nscount = DNS_HEADER_NSCOUNT(abuf);
arcount = DNS_HEADER_ARCOUNT(abuf);
/* Display the answer header. */
sprintf(msg, "id: %d\n", id);
addtobuffer(response->msgbuf, msg);
sprintf(msg, "flags: %s%s%s%s%s\n",
qr ? "qr " : "",
aa ? "aa " : "",
tc ? "tc " : "",
rd ? "rd " : "",
ra ? "ra " : "");
addtobuffer(response->msgbuf, msg);
sprintf(msg, "opcode: %s\n", opcodes[opcode]);
addtobuffer(response->msgbuf, msg);
sprintf(msg, "rcode: %s\n", rcodes[rcode]);
addtobuffer(response->msgbuf, msg);
/* Display the questions. */
addtobuffer(response->msgbuf, "Questions:\n");
aptr = abuf + HFIXEDSZ;
for (i = 0; i < qdcount; i++) {
aptr = display_question(aptr, abuf, alen, response);
if (aptr == NULL) return;
}
/* Display the answers. */
addtobuffer(response->msgbuf, "Answers:\n");
for (i = 0; i < ancount; i++) {
aptr = display_rr(aptr, abuf, alen, response);
if (aptr == NULL) return;
}
/* Display the NS records. */
addtobuffer(response->msgbuf, "NS records:\n");
for (i = 0; i < nscount; i++) {
aptr = display_rr(aptr, abuf, alen, response);
if (aptr == NULL) return;
}
/* Display the additional records. */
addtobuffer(response->msgbuf, "Additional records:\n");
for (i = 0; i < arcount; i++) {
aptr = display_rr(aptr, abuf, alen, response);
if (aptr == NULL) return;
}
return;
}