Add support of IPv6 disabling

CMakeLists.txt

@@ -148,6 +148,11 @@ else()
   add_dllflag("-Wl,-z,defs")
 endif()
 
+option(USE_IPV6 "Use IPv6 in tests" ON)
+if(NOT USE_IPV6)
+  add_definitions(-DUSE_IPV6=0)
+endif()
+
 option(BUILD_TOXAV "Whether to build the tox AV library" ON)
 
 include(Dependencies)

configure.ac

@@ -193,6 +193,16 @@ AC_ARG_ENABLE([[epoll]],
     [enable_epoll='auto']
   )
 
+AC_ARG_ENABLE([[ipv6]],
+  [AS_HELP_STRING([[--disable-ipv6[=ARG]]], [use ipv4 in tests (yes, no, auto) [auto]])],
+    [use_ipv6=${enableval}],
+    [use_ipv6='auto']
+  )
+
+if test "$use_ipv6" != "yes"; then
+  AC_DEFINE([USE_IPV6],[0],[define to 0 to force ipv4])
+fi
+
 AX_HAVE_EPOLL
 if test "$enable_epoll" != "no"; then
   if test "${ax_cv_have_epoll}" = "yes"; then

other/travis/autotools-script

@@ -1,5 +1,16 @@
 #!/bin/sh
 
+if perl -e '
+    use Socket qw(PF_INET6 SOCK_STREAM pack_sockaddr_in6 IN6ADDR_LOOPBACK);
+
+    socket(S, PF_INET6, SOCK_STREAM, 0) || exit 1;
+    bind(S, pack_sockaddr_in6(0, IN6ADDR_LOOPBACK)) || exit 1;
+'; then
+    IPV6_FLAG="--enable-ipv6"
+else
+    IPV6_FLAG="--disable-ipv6"
+fi
+
 # Build toxcore with some custom flags here. Note that this does *not* run the
 # tests, so any flags passed here are irrelevant to testing. This only checks
 # that we can build toxcore with the specified flags. Tests run with default
@@ -12,6 +23,7 @@
   --enable-daemon \
   --enable-logging \
   --enable-ntox \
+  $IPV6_FLAG \
   --with-log-level=TRACE
 
 # We use make instead of RUN $MAKE here, because the autotools build will only

other/travis/toxcore-script

@@ -22,6 +22,18 @@ for i in `seq 0 7`; do
   RUN rm -rf $BUILD_DIR
 done
 
+if perl -e '
+    use Socket qw(PF_INET6 SOCK_STREAM pack_sockaddr_in6 IN6ADDR_LOOPBACK);
+
+    socket(S, PF_INET6, SOCK_STREAM, 0) || exit 1;
+    bind(S, pack_sockaddr_in6(0, IN6ADDR_LOOPBACK)) || exit 1;
+'; then
+    USE_IPV6=yes
+else
+    USE_IPV6=no
+fi
+
+
 # Build toxcore and run tests.
 RUN $CMAKE                                      \
   -B$BUILD_DIR                                  \
@@ -32,6 +44,7 @@ RUN $CMAKE                                      \
   -DSTRICT_ABI=ON                               \
   -DTEST_TIMEOUT_SECONDS=120                    \
   -DTRACE=ON                                    \
+  -DUSE_IPV6=$USE_IPV6                          \
   $CMAKE_EXTRA_FLAGS
 
 export CTEST_OUTPUT_ON_FAILURE=1