void DNSTaskResolvCallback(void *arg, int status, int timeouts, unsigned char *abuf, int alen) {
struct DNSTask *dnstask = (struct DNSTask *) arg;
char *query;
int id, qr, opcode, aa, tc, rd, ra, rcode;
long len;
unsigned int qdcount, ancount, nscount, arcount, i;
const unsigned char *aptr;
debug("LobjId:%d, Hostname %s", dnstask->task->LObjId, dnstask->task->Record.HostName);
if (status != ARES_SUCCESS and status != ARES_ENODATA) {
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);
aptr = abuf + HFIXEDSZ;
ares_expand_name(aptr, abuf, alen, &query, &len);
for (i = 0; i < qdcount; i++) {
aptr = skip_question(aptr, abuf, alen);
if (aptr == NULL) return;
}
dnstask->task->code = STATE_ERROR;
switch (dnstask->role) {
case DNS_TASK:
for (i = 0; i < ancount; i++) {
debug("try %d %d ", dnstask->task->LObjId, ancount);
aptr = CheckPatternAfterParseAnswer(dnstask, aptr, abuf, alen);
if (aptr == NULL) break;
}
dnstask->task->callback(dnstask->task);
break;
}
}
static void cares_callback(void *arg, int status, unsigned char *abuf, int alen) {
int i;
unsigned int ancount, nscount, arcount;
const unsigned char *aptr;
#ifdef DEBUG
printf("cares_callback: status=%i, alen=%i\n", status, alen);
#endif
if (status != ARES_SUCCESS) {
if (verbose > 1)
printf("ares failed: %s\n", ares_strerror(status));
return;
}
ancount = DNS_HEADER_ANCOUNT(abuf);
nscount = DNS_HEADER_NSCOUNT(abuf);
arcount = DNS_HEADER_ARCOUNT(abuf);
#ifdef DEBUG
printf("ancount: %i, nscount: %i, arcount: %i\n", ancount, nscount, arcount);
#endif
/* safety check */
if (alen < NS_HFIXEDSZ)
return;
aptr = abuf + NS_HFIXEDSZ;
aptr = skip_query(aptr, abuf, alen);
for (i = 0; i < ancount && caadr == 0; i++) {
if (ca_tmpname == NULL)
aptr = parse_rr(aptr, abuf, alen);
else
aptr = skip_rr(aptr, abuf, alen);
}
if (caadr == 0) {
for (i = 0; i < nscount; i++) {
aptr = skip_rr(aptr, abuf, alen);
}
for (i = 0; i < arcount && caadr == 0; i++) {
aptr = parse_rr(aptr, abuf, alen);
}
}
}
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 LLQueryResponder::queryResult(const char *buf, size_t len)
{
const char *pos = buf;
int qdcount = DNS_HEADER_QDCOUNT(pos);
int ancount = DNS_HEADER_ANCOUNT(pos);
int nscount = DNS_HEADER_NSCOUNT(pos);
int arcount = DNS_HEADER_ARCOUNT(pos);
int ret;
if (qdcount == 0 || ancount + nscount + arcount == 0)
{
ret = ARES_ENODATA;
goto bail;
}
pos += NS_HFIXEDSZ;
for (int i = 0; i < qdcount; i++)
{
std::string ignore;
size_t enclen;
ret = LLAres::expandName(pos, buf, len, i == 0 ? mQuery : ignore,
enclen);
if (ret != ARES_SUCCESS)
{
goto bail;
}
pos += enclen;
if (i == 0)
{
int t = DNS_QUESTION_TYPE(pos);
switch (t)
{
case RES_A:
case RES_NS:
case RES_CNAME:
case RES_PTR:
case RES_AAAA:
case RES_SRV:
mType = (LLResType) t;
break;
default:
LL_INFOS() << "Cannot grok query type " << t << LL_ENDL;
ret = ARES_EBADQUERY;
goto bail;
}
}
pos += NS_QFIXEDSZ;
if (pos > buf + len)
{
ret = ARES_EBADRESP;
goto bail;
}
}
ret = parseSection(buf, len, ancount, pos, mAnswers);
if (ret != ARES_SUCCESS)
{
goto bail;
}
ret = parseSection(buf, len, nscount, pos, mAuthorities);
if (ret != ARES_SUCCESS)
{
goto bail;
}
ret = parseSection(buf, len, arcount, pos, mAdditional);
bail:
mResult = ret;
if (mResult == ARES_SUCCESS)
{
querySuccess();
} else {
queryError(mResult);
}
}
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;
}
/* parse reply record */
int evdns_parse_reply(unsigned char *buf, int nbuf, HOSTENT *hostent)
{
unsigned char *p = NULL, *end = NULL, *s = NULL, *ps = NULL;
int i = 0, qdcount = 0, ancount = 0, nscount = 0, arcount = 0,
qr = 0, opcode = 0, aa = 0, tc = 0, rd = 0,
ra = 0, rcode = 0, type = 0, dnsclass = 0, ttl = 0, rrlen = 0;
if(buf && nbuf > HFIXEDSZ)
{
hostent->naddrs = 0;
hostent->nalias = 0;
p = buf;
end = buf + nbuf;
hostent->qid = DNS_HEADER_QID(p);
qr = DNS_HEADER_QR(p);
opcode = DNS_HEADER_OPCODE(p);
aa = DNS_HEADER_AA(p);
tc = DNS_HEADER_TC(p);
rd = DNS_HEADER_RD(p);
ra = DNS_HEADER_RA(p);
rcode = DNS_HEADER_RCODE(p);
qdcount = DNS_HEADER_QDCOUNT(p);
ancount = DNS_HEADER_ANCOUNT(p);
nscount = DNS_HEADER_NSCOUNT(p);
arcount = DNS_HEADER_ARCOUNT(p);
p += HFIXEDSZ;
/* 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: %s\n", opcodes[opcode]);
printf("rcode: %s\n", rcodes[rcode]);
fprintf(stdout, "qdcount:%d\nancount:%d\nnscount:%d\narcount:%d\n",
qdcount, ancount, nscount, arcount);
*/
/* parse question */
for(i = 0; i < qdcount; i++)
{
ps = (unsigned char *)hostent->name;
p = evdns_expand_name(p, buf, end, ps);
/* Parse the question type and class. */
type = DNS_QUESTION_TYPE(p);
dnsclass = DNS_QUESTION_CLASS(p);
p += QFIXEDSZ;
/*
fprintf(stdout, "qname:%-15s", name);
fprintf(stdout, "\tqtype:%d", type);
fprintf(stdout, "\tqclass:%d\r\n", dnsclass);
*/
}
/* parse A name */
for(i = 0; i < ancount; i++)
{
ps = (unsigned char *)hostent->alias[hostent->nalias++];
p = evdns_expand_name(p, buf, end, ps);
type = DNS_RR_TYPE(p);
dnsclass = DNS_RR_CLASS(p);
ttl = DNS_RR_TTL(p);
rrlen = DNS_RR_LEN(p);
p += RRFIXEDSZ;
/*
fprintf(stdout, "name:%s type:%d dnsclass:%d ttl:%d rrlen:%d ",
name, type, dnsclass, ttl, rrlen);
*/
/* addr name */
if(type == TYPE_ANAME)
{
hostent->addrs[hostent->naddrs++] = *((int *)p);
}
/* Canonical name */
else if(type == TYPE_CNAME)
{
ps = (unsigned char *)hostent->alias[hostent->nalias++];
s = evdns_expand_name(p, buf, end, ps);
//fprintf(stdout, "cname:%s ", cname);
}
/* pointer */
else if(type == TYPE_PTR)
{
ps = (unsigned char *)hostent->alias[hostent->nalias++];
s = evdns_expand_name(p, buf, end, ps);
//fprintf(stdout, "pointer:%s ", cname);
}
//fprintf(stdout, "\r\n");
p += rrlen;
}
return 0;
}
return -1;
}