From 80e97634cb75878ee94b23ebf35cebc92481fbfc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A1szl=C3=B3=20V=C3=A1rady?= <laszlo.varady@anno.io>
Date: Wed, 30 Aug 2023 19:32:17 +0200
Subject: [PATCH] transport-udp: support platforms where PKTINFO is not
 available
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For example, older macOS versions.

Signed-off-by: László Várady <laszlo.varady@anno.io>
---
 lib/transport/transport-udp-socket.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/transport/transport-udp-socket.c b/lib/transport/transport-udp-socket.c
index 821f20b1ee..2bd9fe2350 100644
--- lib/transport/transport-udp-socket.c
+++ lib/transport/transport-udp-socket.c
@@ -63,6 +63,7 @@ _extract_dest_ip4_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
 GSockAddr *
 _extract_dest_ip4_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
 {
+#ifdef IP_PKTINFO
   if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO)
     {
       struct sockaddr_in sin;
@@ -76,6 +77,7 @@ _extract_dest_ip4_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
       sin.sin_addr = inpkt.ipi_addr;
       return g_sockaddr_new((struct sockaddr *) &sin, sizeof(sin));
     }
+#endif
   return NULL;
 }
 #endif
@@ -85,6 +87,7 @@ _extract_dest_ip4_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
 GSockAddr *
 _extract_dest_ip6_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
 {
+#ifdef IPV6_PKTINFO
   if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO)
     {
       struct sockaddr_in6 sin6;
@@ -98,6 +101,7 @@ _extract_dest_ip6_addr_from_cmsg(struct cmsghdr *cmsg, GSockAddr *bind_addr)
       sin6.sin6_addr = in6pkt.ipi6_addr;
       return g_sockaddr_new((struct sockaddr *) &sin6, sizeof(sin6));
     }
+#endif
   return NULL;
 }
 
@@ -142,11 +146,11 @@ _setup_fd(LogTransportUDP *self, gint fd)
     {
 #if defined(__FreeBSD__) || defined(__OpenBSD__)
       setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &on, sizeof(on));
-#else
+#elif defined(IP_PKTINFO)
       setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &on, sizeof(on));
 #endif
     }
-#if SYSLOG_NG_ENABLE_IPV6
+#if SYSLOG_NG_ENABLE_IPV6 && defined(IPV6_RECVPKTINFO)
   else if (self->bind_addr->sa.sa_family == AF_INET6)
     setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on));
 #endif