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Add configure option to force retry on DNS failure

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This is apparently needed on system which keep nameservers specified
in /etc/resolv.conf even when there is no network connection. Should be
used with care as invalid names will be retried forever.
This commit is contained in:
Miroslav Lichvar
2011-04-05 18:14:05 +02:00
parent faec23f6bd
commit 598c04eea2
2 changed files with 19 additions and 0 deletions
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10
configure vendored
View File

@@ -102,6 +102,7 @@ For better control, use the options below.
--disable-pps Disable PPS API support --disable-pps Disable PPS API support
--disable-rtc Don't include RTC even on Linux --disable-rtc Don't include RTC even on Linux
--disable-linuxcaps Disable Linux capabilities support --disable-linuxcaps Disable Linux capabilities support
--enable-forcednsretry Force retry on DNS failure
Fine tuning of the installation directories: Fine tuning of the installation directories:
--sysconfdir=DIR chrony.conf location [/etc] --sysconfdir=DIR chrony.conf location [/etc]
@@ -162,6 +163,7 @@ feat_ipv6=1
feat_pps=1 feat_pps=1
try_setsched=0 try_setsched=0
try_lockmem=0 try_lockmem=0
feat_forcednsretry=0
for option for option
do do
@@ -226,6 +228,9 @@ do
--disable-linuxcaps) --disable-linuxcaps)
feat_linuxcaps=0 feat_linuxcaps=0
;; ;;
--enable-forcednsretry)
feat_forcednsretry=1
;;
--host-system=* ) --host-system=* )
OPERATINGSYSTEM=`echo $option | sed -e 's/^.*=//;'` OPERATINGSYSTEM=`echo $option | sed -e 's/^.*=//;'`
;; ;;
@@ -399,6 +404,11 @@ then
SYSDEFS="${SYSDEFS} -DHAVE_MLOCKALL" SYSDEFS="${SYSDEFS} -DHAVE_MLOCKALL"
fi fi
if [ $feat_forcednsretry = "1" ]
then
EXTRA_DEFS="$EXTRA_DEFS -DFORCE_DNSRETRY=1"
fi
READLINE_COMPILE="" READLINE_COMPILE=""
READLINE_LINK="" READLINE_LINK=""
if [ $feat_readline = "1" ]; then if [ $feat_readline = "1" ]; then

9
nameserv.c
View File

@@ -56,7 +56,11 @@ DNS_Name2IPAddress(const char *name, IPAddr *addr)
result = getaddrinfo(name, NULL, &hints, &res); result = getaddrinfo(name, NULL, &hints, &res);
if (result) { if (result) {
#ifdef FORCE_DNSRETRY
return DNS_TryAgain;
#else
return result == EAI_AGAIN ? DNS_TryAgain : DNS_Failure; return result == EAI_AGAIN ? DNS_TryAgain : DNS_Failure;
#endif
} }
for (ai = res; !result && ai != NULL; ai = ai->ai_next) { for (ai = res; !result && ai != NULL; ai = ai->ai_next) {
@@ -94,8 +98,13 @@ DNS_Name2IPAddress(const char *name, IPAddr *addr)
return DNS_Success; return DNS_Success;
} }
#ifdef FORCE_DNSRETRY
return DNS_TryAgain;
#else
return DNS_Failure; return DNS_Failure;
#endif #endif
#endif
} }
/* ================================================== */ /* ================================================== */