From: Timo Sirainen <timo.sirainen@open-xchange.com>
Date: Wed, 12 Jun 2019 08:50:08 +0000 (+0300)
Subject: lib: Add net_get_hosterror_type()
X-Git-Tag: 2.3.9~439
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c85f1bc3ce612c736c9d2c468cc08306db1b5851;p=thirdparty%2Fdovecot%2Fcore.git

lib: Add net_get_hosterror_type()
---

diff --git a/src/lib/net.c b/src/lib/net.c
index 99d7bdf69d..25645c39bb 100644
--- a/src/lib/net.c
+++ b/src/lib/net.c
@@ -1062,6 +1062,33 @@ const char *net_gethosterror(int error)
 	return gai_strerror(error);
 }
 
+enum net_hosterror_type net_get_hosterror_type(int error)
+{
+	const struct {
+		int error;
+		enum net_hosterror_type type;
+	} error_map[] = {
+		{ EAI_ADDRFAMILY, NET_HOSTERROR_TYPE_NOT_FOUND },
+		{ EAI_AGAIN, NET_HOSTERROR_TYPE_NAMESERVER },
+		{ EAI_BADFLAGS, NET_HOSTERROR_TYPE_INTERNAL_ERROR },
+		{ EAI_FAIL, NET_HOSTERROR_TYPE_NAMESERVER },
+		{ EAI_FAMILY, NET_HOSTERROR_TYPE_INTERNAL_ERROR },
+		{ EAI_MEMORY, NET_HOSTERROR_TYPE_INTERNAL_ERROR },
+		{ EAI_NODATA, NET_HOSTERROR_TYPE_NOT_FOUND },
+		{ EAI_NONAME, NET_HOSTERROR_TYPE_NOT_FOUND },
+		{ EAI_SERVICE, NET_HOSTERROR_TYPE_INTERNAL_ERROR },
+		{ EAI_SOCKTYPE, NET_HOSTERROR_TYPE_INTERNAL_ERROR },
+		{ EAI_SYSTEM, NET_HOSTERROR_TYPE_INTERNAL_ERROR },
+	};
+	for (unsigned int i = 0; i < N_ELEMENTS(error_map); i++) {
+		if (error_map[i].error == error)
+			return error_map[i].type;
+	}
+
+	/* shouldn't happen? assume internal error */
+	return NET_HOSTERROR_TYPE_INTERNAL_ERROR;
+}
+
 int net_hosterror_notfound(int error)
 {
 #ifdef EAI_NODATA /* NODATA is depricated */
diff --git a/src/lib/net.h b/src/lib/net.h
index 3b540d0029..84d2f45b01 100644
--- a/src/lib/net.h
+++ b/src/lib/net.h
@@ -48,6 +48,15 @@ enum net_listen_flags {
 	NET_LISTEN_FLAG_REUSEPORT	= 0x01
 };
 
+enum net_hosterror_type {
+	/* Internal error - should be logged as an error */
+	NET_HOSTERROR_TYPE_INTERNAL_ERROR,
+	/* Host not found or no valid IP addresses found */
+	NET_HOSTERROR_TYPE_NOT_FOUND,
+	/* Nameserver returned an error */
+	NET_HOSTERROR_TYPE_NAMESERVER,
+};
+
 /* INADDR_ANY for IPv4 or IPv6. The IPv6 any address may
    include IPv4 depending on the system (Linux yes, BSD no). */
 extern const struct ip_addr net_ip4_any;
@@ -122,6 +131,8 @@ int net_gethostbyname(const char *addr, struct ip_addr **ips,
 int net_gethostbyaddr(const struct ip_addr *ip, const char **name_r);
 /* get error of net_gethostname() */
 const char *net_gethosterror(int error) ATTR_CONST;
+/* Return type of the error returned by net_gethostname() */
+enum net_hosterror_type net_get_hosterror_type(int error);
 /* return TRUE if host lookup failed because it didn't exist (ie. not
    some error with name server) */
 int net_hosterror_notfound(int error) ATTR_CONST;