Hackery to get udpgw building on Mac

.gitignore

@@ -0,0 +1,5 @@
+Makefile
+CMakeFiles
+*.a
+*.cmake
+CMakeCache.txt

CMakeLists.txt

@@ -168,8 +168,9 @@ else ()
     set(BADVPN_THREADWORK_USE_PTHREAD 1)
     add_definitions(-DBADVPN_THREADWORK_USE_PTHREAD)
     add_definitions(-DBADVPN_THREAD_SAFE=1)
+    add_definitions(-DBADVPN_USE_KEVENT)
 
-    link_libraries(rt pthread)
+    link_libraries(pthread)
 
     if (EMSCRIPTEN)
         add_definitions(-DBADVPN_EMSCRIPTEN)
@@ -215,7 +216,6 @@ else ()
         if (NOT HAVE_KQUEUE)
             message(FATAL_ERROR "kqueue is required")
         endif ()
-        add_definitions(-DBADVPN_USE_KEVENT)
     endif ()
 
     if (NOT DEFINED BADVPN_WITHOUT_CRYPTODEV)

compile-udpgw-mac.sh

@@ -0,0 +1,13 @@
+# Unclear how many of these are necessary
+export CPPFLAGS="-I/usr/local/opt/openssl@3/include -I/usr/local/opt/nss/include"
+export CFLAGS="-I/usr/local/opt/openssl@3/include -I/usr/local/opt/nss/include"
+export LDFLAGS="-L/usr/local/opt/openssl@3/lib -L/usr/local/opt/nss/lib"
+
+cmake . -DBUILD_NOTHING_BY_DEFAULT=1 -DBUILD_UDPGW=1
+
+# This will fail, but whatever
+make
+
+# This should work
+cd udpgw
+make

compile-udpgw.sh

@@ -82,4 +82,4 @@ for f in $SOURCES; do
     OBJS=( "${OBJS[@]}" "${obj}" )
 done
 
-"${CC}" ${LDFLAGS} "${OBJS[@]}" -o udpgw -lrt -lpthread
+"${CC}" ${LDFLAGS} "${OBJS[@]}" -o udpgw -lpthread

system/BDatagram_unix.c

@@ -31,6 +31,8 @@
 #define _GNU_SOURCE
 #endif
 
+#define __APPLE_USE_RFC_2292
+
 #include <stddef.h>
 #include <string.h>
 #include <unistd.h>

system/BDatagram_unix.h

@@ -32,6 +32,7 @@
 
 #define BDATAGRAM_SEND_LIMIT 2
 #define BDATAGRAM_RECV_LIMIT 2
+#define __APPLE_USE_RFC_2292
 
 struct BDatagram_s {
     BReactor *reactor;

udpgw/CMakeLists.txt

@@ -1,7 +1,7 @@
 add_executable(badvpn-udpgw
     udpgw.c
 )
-target_link_libraries(badvpn-udpgw system flow flowextra)
+target_link_libraries(badvpn-udpgw system flow flowextra resolv)
 
 install(
     TARGETS badvpn-udpgw