From c00cf65b1c29b836e0c95c28b22279157585a2e7 Mon Sep 17 00:00:00 2001
From: Stef Walter <stef@memberwebs.com>
Date: Tue, 10 Jun 2008 02:47:43 +0000
Subject: Add support for resolving name server to multiple ip addresses

---
 tools/notify-dns-slaves.c | 75 +++++++++++++++++++++++++++++++++++++----------
 1 file changed, 59 insertions(+), 16 deletions(-)

(limited to 'tools')

diff --git a/tools/notify-dns-slaves.c b/tools/notify-dns-slaves.c
index 3a7f342..956fdac 100644
--- a/tools/notify-dns-slaves.c
+++ b/tools/notify-dns-slaves.c
@@ -386,7 +386,7 @@ process_all_packets (uint64_t when, void *unused)
 }
 
 static void
-prepare_and_process (notification *notif, uint64_t when)
+complete_packet (notification *notif, uint64_t when)
 {
 	assert (notif);
 	assert (SANY_TYPE (notif->address));
@@ -397,39 +397,81 @@ prepare_and_process (notification *notif, uint64_t when)
 	notif->timeout = notif->start + TIMEOUT_INTERVAL;
 	notif->retries = RETRIES;
 	notif->retry = when;
+}
+
+static notification*
+duplicate_notification (notification *orig)
+{
+	notification *notif;
+	HEADER *hdr;
+
+	assert (orig);
+
+	notif = calloc (1, sizeof (notification));
+	if (!notif) {
+		warningx ("out of memory");
+		return NULL;
+	}
+
+	memcpy (notif, orig, sizeof (notification));
+	hdr = (HEADER*)notif->packet;
+	notif->unique = hdr->id = htons (unique_identifier++);
+
+	/* Add it to the queue */
+	notif->next = the_notifications;
+	the_notifications = notif;
 
-	process_all_packets (when, NULL);
+	return notif;
 }
 
 static void
 address_resolved (int ecode, struct addrinfo *ai, void *arg)
 {
-	notification **not, *notif;
+	notification **not, *notif, *copy;
+	char hostname[256];
+	uint64_t when;
+	int num = 0;
 
 	for (not = &the_notifications; *not; not = &(*not)->next) {
 		notif = *not;
 
-		/* We search for the notification, in case it has been freed */
-		if (notif != arg)
-			continue;
-
 		/* A bummer resolve */
 		if (ecode) {
 			warningx ("couldn't resolve server: %s: %s",
 			          notif->server, gai_strerror (ecode));
 			*not = notif->next;
 			free (notif);
-			break;
+			return;
+		}
+
+		when = server_get_time ();
 
 		/* A successful resolve */
-		} else {
-			debug ("resolved address for: %s", notif->server);
-			memcpy (&SANY_ADDR (notif->address), ai->ai_addr, ai->ai_addrlen);
-			SANY_LEN (notif->address) = ai->ai_addrlen;
-			notif->resolved = 1;
-			prepare_and_process (notif, server_get_time ());
-			break;
+		while (ai) {
+			if (num == 0)
+				copy = notif;
+			else
+				copy = duplicate_notification (notif);
+
+			if (copy) {
+				memcpy (&SANY_ADDR (copy->address), ai->ai_addr, ai->ai_addrlen);
+				SANY_LEN (copy->address) = ai->ai_addrlen;
+				copy->resolved = 1;
+				++num;
+
+				if (sock_any_ntop (&copy->address, hostname, sizeof (hostname), SANY_OPT_NOPORT) < 0)
+					strcpy (hostname, "[unknown]");
+				debug ("resolved address for: %s", hostname);
+
+				complete_packet (copy, when);
+			}
+
+			/* The next resolved address */
+			ai = ai->ai_next;
 		}
+
+		process_all_packets (when, NULL);
+		return;
 	}
 }
 
@@ -578,7 +620,8 @@ process_notify (const char *zone, const char *server, uint64_t delay)
 		async_resolver_queue (notif->server, "53", &hints, address_resolved, notif);
 	} else {
 		notif->resolved = 1;
-		prepare_and_process (notif, when);
+		complete_packet (notif, when);
+		process_all_packets (when, NULL);
 	}
 
 	return 0;
-- 
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