From cb70b78c443de5f8b95c4469dd8eb7f77af880ed Mon Sep 17 00:00:00 2001
From: Dimitri Staessens <dimitri@ouroboros.rocks>
Date: Sat, 26 Jun 2021 00:20:17 +0200
Subject: build: Fix compilation with fuse (RIB) on FreeBSD

Compilation failed on FreeBSD 14 with fuse enabled because of some
missing definitions. __XSI_VISIBLE must be set before including
<ouroboros/rib.h> for some definitions in <sys/stat.h>. FreeBSD
doesn't know the MSG_CONFIRM flag to sendto() or
CLOCK_REALTIME_COARSE, which are Linux-specific.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
---
 src/ipcpd/udp/main.c               | 12 +++++++++---
 src/ipcpd/unicast/dt.c             |  1 +
 src/ipcpd/unicast/fa.c             |  5 +++++
 src/ipcpd/unicast/pol/link_state.c |  1 +
 src/lib/rib.c                      |  9 +++++----
 5 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/src/ipcpd/udp/main.c b/src/ipcpd/udp/main.c
index 03de24ab..6a3fb24a 100644
--- a/src/ipcpd/udp/main.c
+++ b/src/ipcpd/udp/main.c
@@ -75,6 +75,12 @@
 #define MGMT_FRAME_SIZE          (sizeof(struct mgmt_msg))
 #define MGMT_FRAME_BUF_SIZE      2048
 
+#ifdef __linux__
+#define SENDTO_FLAGS MSG_CONFIRM
+#else
+#define SENDTO_FLAGS 0
+#endif
+
 struct ipcp ipcpi;
 
 /* Keep order for alignment. */
@@ -216,7 +222,7 @@ static int ipcp_udp_port_alloc(const struct sockaddr_in * r_saddr,
         memcpy(buf + len, data, dlen);
 
         if (sendto(udp_data.s_fd, msg, len + dlen,
-                   MSG_CONFIRM,
+                   SENDTO_FLAGS,
                    (const struct sockaddr *) r_saddr, sizeof(*r_saddr)) < 0) {
                 free(buf);
                 return -1;
@@ -249,7 +255,7 @@ static int ipcp_udp_port_alloc_resp(const struct sockaddr_in * r_saddr,
         memcpy(msg + 1, data, len);
 
         if (sendto(udp_data.s_fd, msg, sizeof(*msg) + len,
-                   MSG_CONFIRM,
+                   SENDTO_FLAGS,
                    (const struct sockaddr *) r_saddr, sizeof(*r_saddr)) < 0 ) {
                 free(msg);
                 return -1;
@@ -552,7 +558,7 @@ static void * ipcp_udp_packet_writer(void * o)
                         pthread_cleanup_push(cleanup_sdb, sdb);
 
                         if (sendto(udp_data.s_fd, buf, len + OUR_HEADER_LEN,
-                                   MSG_CONFIRM,
+                                   SENDTO_FLAGS,
                                    (const struct sockaddr *) &saddr,
                                    sizeof(saddr)) < 0)
                                 log_err("Failed to send packet.");
diff --git a/src/ipcpd/unicast/dt.c b/src/ipcpd/unicast/dt.c
index 92496e54..c57ce031 100644
--- a/src/ipcpd/unicast/dt.c
+++ b/src/ipcpd/unicast/dt.c
@@ -24,6 +24,7 @@
 #define _DEFAULT_SOURCE
 #else
 #define _POSIX_C_SOURCE 200112L
+#define __XSI_VISIBLE 500
 #endif
 
 #include "config.h"
diff --git a/src/ipcpd/unicast/fa.c b/src/ipcpd/unicast/fa.c
index 71351d5a..14303a21 100644
--- a/src/ipcpd/unicast/fa.c
+++ b/src/ipcpd/unicast/fa.c
@@ -24,6 +24,7 @@
 #define _DEFAULT_SOURCE
 #else
 #define _POSIX_C_SOURCE 200112L
+#define __XSI_VISIBLE 500
 #endif
 
 #include "config.h"
@@ -51,6 +52,10 @@
 #include <stdlib.h>
 #include <string.h>
 
+#if defined (IPCP_FLOW_STATS) && !defined(CLOCK_REALTIME_COARSE)
+#define CLOCK_REALTIME_COARSE CLOCK_REALTIME
+#endif
+
 #define TIMEOUT 10000 /* nanoseconds */
 
 #define FLOW_REQ    0
diff --git a/src/ipcpd/unicast/pol/link_state.c b/src/ipcpd/unicast/pol/link_state.c
index cca85d63..69044889 100644
--- a/src/ipcpd/unicast/pol/link_state.c
+++ b/src/ipcpd/unicast/pol/link_state.c
@@ -24,6 +24,7 @@
 #define _DEFAULT_SOURCE
 #else
 #define _POSIX_C_SOURCE 200112L
+#define __XSI_VISIBLE 500
 #endif
 
 #include "config.h"
diff --git a/src/lib/rib.c b/src/lib/rib.c
index d9f59a3e..0418252b 100644
--- a/src/lib/rib.c
+++ b/src/lib/rib.c
@@ -24,6 +24,10 @@
 
 #include "config.h"
 
+#if defined (__FreeBSD__)
+#define __XSI_VISIBLE 500
+#endif
+
 #include <ouroboros/errno.h>
 #include <ouroboros/list.h>
 #include <ouroboros/rib.h>
@@ -41,9 +45,7 @@
 #define FUSE_USE_VERSION  26
 #if defined (__linux__)
 #define __USE_XOPEN
-#elif defined (__FreeBSD__)
-#define __XSI_VISIBLE 500
-#endif
+#endif /* __linux__ */
 #include <fuse.h>
 
 #ifndef CLOCK_REALTIME_COARSE
@@ -266,7 +268,6 @@ static void * fuse_thr(void * o)
 }
 #endif /* HAVE_FUSE */
 
-
 int rib_init(const char * mountpt)
 {
 #ifdef HAVE_FUSE
-- 
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