From 16b50c700f517efdf2a1528eaa603fd2c3200453 Mon Sep 17 00:00:00 2001
From: Brian Kendall <brian@briankendall.net>
Date: Fri, 28 Oct 2022 13:12:56 -0400
Subject: [PATCH] Add optional parameter for binding service to specific
 interface

---
 avahicore.cpp | 14 +++++++++-----
 bonjour.cpp   |  4 ++--
 qzeroconf.h   |  2 +-
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/avahicore.cpp b/avahicore.cpp
index b9dd1ca..8fe08c2 100644
--- a/avahicore.cpp
+++ b/avahicore.cpp
@@ -72,7 +72,7 @@ public:
 				ref->ready = 1;
                 if (ref->registerWaiting) {
                     ref->registerWaiting = 0;
-                    ref->registerService(ref->name.toUtf8(), ref->type.toUtf8(), ref->domain.toUtf8(), ref->port);
+                    ref->registerService(ref->name.toUtf8(), ref->type.toUtf8(), ref->domain.toUtf8(), ref->port, 0);
 				}
 				break;
 			case AVAHI_SERVER_COLLISION:
@@ -230,7 +230,7 @@ public:
 		resolvers.clear();
 	}
 
-	void registerService(const char *name, const char *type, const char *domain, quint16 port)
+	void registerService(const char *name, const char *type, const char *domain, quint16 port, quint32 interface)
 	{
 		qint32 ret;
 		group = avahi_s_entry_group_new(server, QZeroConfPrivate::groupCallback, this);
@@ -239,7 +239,11 @@ public:
 			return;
 		}
 
-		ret = avahi_server_add_service_strlst(server, group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_UPDATE, name, type, domain, NULL, port, txt);
+		if (interface <= 0) {
+			interface = AVAHI_IF_UNSPEC;
+		}
+
+		ret = avahi_server_add_service_strlst(server, group, interface, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_UPDATE, name, type, domain, NULL, port, txt);
 		if (ret < 0) {
 			avahi_s_entry_group_free(group);
 			group = NULL;
@@ -290,14 +294,14 @@ QZeroConf::~QZeroConf()
 	delete pri;
 }
 
-void QZeroConf::startServicePublish(const char *name, const char *type, const char *domain, quint16 port)
+void QZeroConf::startServicePublish(const char *name, const char *type, const char *domain, quint16 port, quint32 interface)
 {
 	if (pri->group) {
 		emit error(QZeroConf::serviceRegistrationFailed);
 		return;
 	}
 	if (pri->ready)
-		pri->registerService(name, type, domain, port);
+		pri->registerService(name, type, domain, port, interface);
 	else {
 		pri->registerWaiting = 1;
 		pri->name = name;
diff --git a/bonjour.cpp b/bonjour.cpp
index c43e0e9..2698af0 100644
--- a/bonjour.cpp
+++ b/bonjour.cpp
@@ -268,7 +268,7 @@ QZeroConf::~QZeroConf()
 	delete pri;
 }
 
-void QZeroConf::startServicePublish(const char *name, const char *type, const char *domain, quint16 port)
+void QZeroConf::startServicePublish(const char *name, const char *type, const char *domain, quint16 port, quint32 interface)
 {
 	DNSServiceErrorType err;
 
@@ -277,7 +277,7 @@ void QZeroConf::startServicePublish(const char *name, const char *type, const ch
 		return;
 	}
 
-	err = DNSServiceRegister(&pri->dnssRef, 0, 0,
+	err = DNSServiceRegister(&pri->dnssRef, 0, interface,
 			name,
 			type,
 			domain,
diff --git a/qzeroconf.h b/qzeroconf.h
index 4597591..cbbbb0d 100644
--- a/qzeroconf.h
+++ b/qzeroconf.h
@@ -50,7 +50,7 @@ public:
 	};
     QZeroConf(QObject *parent = Q_NULLPTR);
 	~QZeroConf();
-	void startServicePublish(const char *name, const char *type, const char *domain, quint16 port);
+	void startServicePublish(const char *name, const char *type, const char *domain, quint16 port, quint32 interface = 0);
 	void stopServicePublish(void);
 	bool publishExists(void);
 	inline void startBrowser(QString type)