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authorMatthias Andree <matthias.andree@gmx.de>2013-02-03 15:54:58 +0100
committerMatthias Andree <matthias.andree@gmx.de>2013-02-03 15:54:58 +0100
commitab5425702f3448cd56e1bb0c3a751c6c34c55d5f (patch)
treee11f69190c3b9dd27e6e7059ef4fe1faa3a7369a /checkalias.c
parent03a31a4771efd7e48256ac0d7d2442f5e6bc381f (diff)
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Work around systems returning obsolete EAI_NODATA.
Older systems that provide the older RFC-2553 implementation of getaddrinfo, rather than the current RFC-3493, and systems that do not provide this getaddrinfo() interface at all and thus use the replacement functions from libesmtp/getaddrinfo.?, might return EAI_NODATA when a host is registered in DNS as MX or similar, but without A or AAAA records. Handle this situation when checking for multidrop aliases and treat EAI_NODATA the same as EAI_NONAME, i. e. name cannot be resolved. The proper fix, however, is to upgrade the operating system.
Diffstat (limited to 'checkalias.c')
-rw-r--r--checkalias.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/checkalias.c b/checkalias.c
index 2e50ea09..1e1d1633 100644
--- a/checkalias.c
+++ b/checkalias.c
@@ -194,6 +194,15 @@ int is_host_alias(const char *name, struct query *ctl, struct addrinfo **res)
switch (e)
{
case EAI_NONAME: /* specified host is unknown */
+#ifdef EAI_NODATA
+ /* EAI_NODATA was in the older RFC-2553, but that got
+ * obsoleted by RFC-3493 - there, EAI_NODATA is no longer
+ * valid, and modern operating systems no longer issue this
+ * error code. libesmtp/getaddrinfo.?, however, still does.
+ * (This was reported to Brian Stafford 2013-02-03.)
+ */
+ case EAI_NODATA: /* specified host is unknown */
+#endif
break;
default: