ipcpd: Support Berkeley Packet Filter in LLC shim

This adds support reading Ethernet frames using the Berkeley Packet
Filter (BPF). Ouroboros now fully runs on OS X Sierra.

1 files changed, 43 insertions, 20 deletions

diff --git a/src/ipcpd/shim-eth-llc/CMakeLists.txt b/src/ipcpd/shim-eth-llc/CMakeLists.txt
index 12bfb42e..21003cf0 100644
--- a/src/ipcpd/shim-eth-llc/CMakeLists.txt
+++ b/src/ipcpd/shim-eth-llc/CMakeLists.txt
@@ -17,31 +17,54 @@ find_path(NETMAP_C_INCLUDE_DIR
   HINTS /usr/include /usr/local/include
   )
 
-protobuf_generate_c(SHIM_ETH_LLC_PROTO_SRCS SHIM_ETH_LLC_PROTO_HDRS
-  shim_eth_llc_messages.proto)
-
-set(IPCP_SHIM_ETH_LLC_TARGET ipcpd-shim-eth-llc
-  CACHE STRING "IPCP_SHIM_ETH_LLC_TARGET")
-
-set(SHIM_ETH_LLC_SOURCES
-  # Add source files here
-  ${CMAKE_CURRENT_SOURCE_DIR}/main.c)
+find_path(BPF_C_INCLUDE_DIR
+  net/bpf.h
+  HINTS /usr/include /usr/local/include
+  )
 
-add_executable(ipcpd-shim-eth-llc ${SHIM_ETH_LLC_SOURCES} ${IPCP_SOURCES}
-  ${SHIM_ETH_LLC_PROTO_SRCS})
-target_link_libraries(ipcpd-shim-eth-llc LINK_PUBLIC ouroboros
-  ${PROTOBUF_C_LIBRARY})
+if (NOT CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
+    NOT BPF_C_INCLUDE_DIR STREQUAL "BPF_C_INCLUDE_DIR-NOTFOUND")
+  message(STATUS "Found Berkeley Packet Filter headers in ${BPF_C_INCLUDE_DIR}")
+  set(HAVE_BPF "1" CACHE STRING "Have Berkeley Packet Filter")
+endif ()
 
-if (NOT ${NETMAP_C_INCLUDE_DIR} STREQUAL "NETMAP_C_INCLUDE_DIR-NOTFOUND")
+if (NOT NETMAP_C_INCLUDE_DIR STREQUAL "NETMAP_C_INCLUDE_DIR-NOTFOUND")
   message(STATUS "Found netmap headers in ${NETMAP_C_INCLUDE_DIR}")
-  include_directories(${NETMAP_C_INCLUDE_DIR})
   set(HAVE_NETMAP "1" CACHE STRING "Have netmap")
   test_and_set_c_compiler_flag_global(-std=c99)
 endif ()
 
-include(AddCompileFlags)
-if (CMAKE_BUILD_TYPE MATCHES Debug)
-  add_compile_flags(ipcpd-shim-eth-llc -DCONFIG_OUROBOROS_DEBUG)
-endif (CMAKE_BUILD_TYPE MATCHES Debug)
+if (HAVE_NETMAP OR HAVE_BPF OR CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  message(STATUS "Supported raw Ethernet API found, building shim-eth-llc")
+  protobuf_generate_c(SHIM_ETH_LLC_PROTO_SRCS SHIM_ETH_LLC_PROTO_HDRS
+    shim_eth_llc_messages.proto)
+
+  set(SHIM_ETH_LLC_SOURCES
+    # Add source files here
+    ${CMAKE_CURRENT_SOURCE_DIR}/main.c
+  )
+
+  set(IPCP_SHIM_ETH_LLC_TARGET ipcpd-shim-eth-llc
+      CACHE STRING "IPCP_SHIM_ETH_LLC_TARGET")
+
+  add_executable(ipcpd-shim-eth-llc ${SHIM_ETH_LLC_SOURCES} ${IPCP_SOURCES}
+    ${SHIM_ETH_LLC_PROTO_SRCS})
+
+  if (HAVE_BPF AND NOT APPLE)
+    target_include_directories(ipcpd-shim-eth-llc PUBLIC ${BPF_C_INCLUDE_DIR})
+  endif ()
+
+  if (HAVE_NETMAP AND NOT APPLE)
+    target_include_directories(ipcpd-shim-eth-llc PUBLIC ${NETMAP_C_INCLUDE_DIR})
+  endif ()
 
-install(TARGETS ipcpd-shim-eth-llc RUNTIME DESTINATION sbin)
+  target_link_libraries(ipcpd-shim-eth-llc LINK_PUBLIC ouroboros
+    ${PROTOBUF_C_LIBRARY})
+
+  include(AddCompileFlags)
+  if (CMAKE_BUILD_TYPE MATCHES Debug)
+    add_compile_flags(ipcpd-shim-eth-llc -DCONFIG_OUROBOROS_DEBUG)
+  endif (CMAKE_BUILD_TYPE MATCHES Debug)
+
+  install(TARGETS ipcpd-shim-eth-llc RUNTIME DESTINATION sbin)
+endif ()