I'm sorry, 0002-Add-DNS_ERR_….patch had no error description and had
too much typos per line.
Here is correct patch.
--
WBRBW, Leonid Evdokimov
xmpp:l...@darkk.net.ru && http://darkk.net.ru
tel:+79816800702 && tel:+79050965222
From eade47790a2ca423390565eee87bf69bd46ee1b1 Mon Sep 17 00:00:00 2001
From: Leonid Evdokimov <da...@yandex-team.ru>
Date: Wed, 10 Aug 2011 15:58:47 +0400
Subject: [PATCH 2/2] Add DNS_ERR_NOANSWER error code to handle emptry replies.
---
evdns.c | 7 ++++++-
include/event2/dns.h | 2 ++
2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/evdns.c b/evdns.c
index 9beac91..b6c2916 100644
--- a/evdns.c
+++ b/evdns.c
@@ -842,13 +842,17 @@ reply_handle(struct request *const req, u16 flags, u32 ttl, struct reply *reply)
/* there was an error */
if (flags & 0x0200) {
error = DNS_ERR_TRUNCATED;
- } else {
+ } else if (flags & 0x000f) {
u16 error_code = (flags & 0x000f) - 1;
if (error_code > 4) {
error = DNS_ERR_UNKNOWN;
} else {
error = error_codes[error_code];
}
+ } else if (reply && !reply->have_answer) {
+ error = DNS_ERR_NOANSWER;
+ } else {
+ error = DNS_ERR_UNKNOWN;
}
switch (error) {
@@ -3841,6 +3845,7 @@ evdns_err_to_string(int err)
case DNS_ERR_TIMEOUT: return "request timed out";
case DNS_ERR_SHUTDOWN: return "dns subsystem shut down";
case DNS_ERR_CANCEL: return "dns request canceled";
+ case DNS_ERR_NOANSWER: return "no answer in the reply";
default: return "[Unknown error code]";
}
}
diff --git a/include/event2/dns.h b/include/event2/dns.h
index f9f9d0b..a8165db 100644
--- a/include/event2/dns.h
+++ b/include/event2/dns.h
@@ -166,6 +166,8 @@ extern "C" {
#define DNS_ERR_SHUTDOWN 68
/** The request was canceled via a call to evdns_cancel_request */
#define DNS_ERR_CANCEL 69
+/** There were no answers and no error condition in the DNS packet. */
+#define DNS_ERR_NOANSWER 70
#define DNS_IPv4_A 1
#define DNS_PTR 2
--
1.7.4.1
