From 8635449a060aae62af80dad139dc06fbb9a346d9 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Sat, 13 Jun 2020 21:39:39 +0200
Subject: [PATCH] Set NOSIGPIPE on all sockets.

MacOS can raise a SIGPIPE when a local socket gets disconnected.
---
 src/meshlink.c   | 10 ++++++++++
 src/net_socket.c |  5 +++++
 src/utcp-test.c  |  5 +++++
 3 files changed, 20 insertions(+)

diff --git a/src/meshlink.c b/src/meshlink.c
index d3cf36ad..a5d8d431 100644
--- a/src/meshlink.c
+++ b/src/meshlink.c
@@ -268,6 +268,11 @@ char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int fami
 
 		int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
 
+#ifdef SO_NOSIGPIPE
+		int nosigpipe = 1;
+		setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
+#endif
+
 		if(s >= 0) {
 			set_timeout(s, 5000);
 
@@ -2905,6 +2910,11 @@ bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
 					continue;
 				}
 
+#ifdef SO_NOSIGPIPE
+				int nosigpipe = 1;
+				setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
+#endif
+
 				set_timeout(state.sock, 5000);
 
 				if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
diff --git a/src/net_socket.c b/src/net_socket.c
index 51a79c1d..5464b95f 100644
--- a/src/net_socket.c
+++ b/src/net_socket.c
@@ -71,6 +71,11 @@ static void configure_tcp(connection_t *c) {
 	int lowdelay = IPTOS_LOWDELAY;
 	setsockopt(c->socket, IPPROTO_IP, IP_TOS, (void *)&lowdelay, sizeof(lowdelay));
 #endif
+
+#if defined(SO_NOSIGPIPE)
+	int nosigpipe = 1;
+	setsockopt(c->socket, SOL_SOCKET, SO_NOSIGPIPE, (void *)&nosigpipe, sizeof(nosigpipe));
+#endif
 }
 
 static void retry_outgoing_handler(event_loop_t *loop, void *data) {
diff --git a/src/utcp-test.c b/src/utcp-test.c
index d78c4b86..564bfba8 100644
--- a/src/utcp-test.c
+++ b/src/utcp-test.c
@@ -270,6 +270,11 @@ int main(int argc, char *argv[]) {
 			return 1;
 		}
 	} else {
+#ifdef SO_NOSIGPIPE
+		int nosigpipe = 1;
+		setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
+#endif
+
 		if(connect(s, ai->ai_addr, ai->ai_addrlen)) {
 			debug("Could not connect: %s\n", strerror(errno));
 			return 1;
-- 
2.39.2