create_icmp_socket.c 850 B

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * Utility routines.
  4. *
  5. * create raw socket for icmp protocol
  6. * and drop root privileges if running setuid
  7. *
  8. * Licensed under GPLv2, see file LICENSE in this tarball for details.
  9. */
  10. #include "libbb.h"
  11. int FAST_FUNC create_icmp_socket(void)
  12. {
  13. int sock;
  14. #if 0
  15. struct protoent *proto;
  16. proto = getprotobyname("icmp");
  17. /* if getprotobyname failed, just silently force
  18. * proto->p_proto to have the correct value for "icmp" */
  19. sock = socket(AF_INET, SOCK_RAW,
  20. (proto ? proto->p_proto : 1)); /* 1 == ICMP */
  21. #else
  22. sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */
  23. #endif
  24. if (sock < 0) {
  25. if (errno == EPERM)
  26. bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
  27. bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
  28. }
  29. /* drop root privs if running setuid */
  30. xsetuid(getuid());
  31. return sock;
  32. }