File 0027-master-Plugs-a-socket-descriptor-leak-in-OMAPI.patch of Package dhcp.4389

From 1a6b62fe17a42b00fa234d06b6dfde3d03451894 Mon Sep 17 00:00:00 2001
From: Thomas Markwalder <tmark@isc.org>
Date: Thu, 7 Dec 2017 11:23:36 -0500
Subject: [PATCH] [master] Plugs a socket descriptor leak in OMAPI

    Merges in rt46767.
---
 RELNOTES         | 5 +++++
 omapip/buffer.c  | 9 +++++++++
 omapip/message.c | 2 +-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/RELNOTES b/RELNOTES
index 3e70688..97a9823 100644
--- a/RELNOTES
+++ b/RELNOTES
@@ -622,6 +622,11 @@ by Eric Young (eay@cryptsoft.com).
 - Handle an absent resolv.conf file better.
   [ISC-Bugs #35194]
 
+- Plugged a socket descriptor leak in OMAPI, that can occur when there is
+  data pending to be written to an OMAPI connection, when the connection
+  is closed by the reader.
+  [ISc-Bugs #46767]
+
 			Changes since 4.2.0 (new features)
 
 - If a client renews before 'dhcp-cache-threshold' percent of its lease
diff --git a/omapip/buffer.c b/omapip/buffer.c
index f7fdc32..809034d 100644
--- a/omapip/buffer.c
+++ b/omapip/buffer.c
@@ -566,6 +566,15 @@ isc_result_t omapi_connection_writer (omapi_object_t *h)
 			omapi_buffer_dereference (&buffer, MDL);
 		}
 	}
+
+	/* If we had data left to write when we're told to disconnect,
+	* we need recall disconnect, now that we're done writing.
+	* See rt46767. */
+	if (c->out_bytes == 0 && c->state == omapi_connection_disconnecting) {
+		omapi_disconnect (h, 1);
+		return ISC_R_SHUTTINGDOWN;
+	}
+
 	return ISC_R_SUCCESS;
 }
 
diff --git a/omapip/message.c b/omapip/message.c
index 59ccdc2..21bcfc3 100644
--- a/omapip/message.c
+++ b/omapip/message.c
@@ -339,7 +339,7 @@ isc_result_t omapi_message_unregister (omapi_object_t *mo)
 }
 
 #ifdef DEBUG_PROTOCOL
-static const char *omapi_message_op_name(int op) {
+const char *omapi_message_op_name(int op) {
 	switch (op) {
 	case OMAPI_OP_OPEN:    return "OMAPI_OP_OPEN";
 	case OMAPI_OP_REFRESH: return "OMAPI_OP_REFRESH";
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