src/cmake/modules/CheckBPFAttach.cmake

   1
   2 INCLUDE(CheckCSourceRuns)
   3
   4 CHECK_C_SOURCE_RUNS("
   5 #include <unistd.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <sys/socket.h>
   9 #include <linux/filter.h>
  10
  11 int
  12 main(int argc, char *argv[])
  13 {
  14         struct sock_fprog bpf;
  15         int empty;
  16         int sock = 0;
  17
  18         memset(&bpf, 0, sizeof(bpf));
  19
  20         setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &bpf, sizeof(bpf));
  21         setsockopt(sock, SOL_SOCKET, SO_DETACH_FILTER, &empty, sizeof(empty));
  22         exit(0);
  23 }
  24 "
  25         BPFATTACH_RUN_RESULT)
  26
  27 SET(HAVE_BPF_ATTACH NO)
  28 IF(BPFATTACH_RUN_RESULT EQUAL 1)
  29     SET(HAVE_BPF_ATTACH YES)
  30     MESSAGE(STATUS "System has SO_ATTACH_FILTER/SO_DETACH_FILTER support")
  31 ELSE(BPFATTACH_RUN_RESULT EQUAL 1)
  32     MESSAGE(STATUS "System does not have SO_ATTACH_FILTER/SO_DETACH_FILTER support")
  33 ENDIF(BPFATTACH_RUN_RESULT EQUAL 1)