LXR busybox/libbb/create_icmp

   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 source tree.
   9 */
  10
  11#include "libbb.h"
  12
  13int FAST_FUNC create_icmp_socket(void)
  14{
  15        int sock;
  16#if 0
  17        struct protoent *proto;
  18        proto = getprotobyname("icmp");
  19        /* if getprotobyname failed, just silently force
  20         * proto->p_proto to have the correct value for "icmp" */
  21        sock = socket(AF_INET, SOCK_RAW,
  22                        (proto ? proto->p_proto : 1)); /* 1 == ICMP */
  23#else
  24        sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */
  25#endif
  26        if (sock < 0) {
  27                if (errno == EPERM)
  28                        bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
  29                bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
  30        }
  31
  32        /* drop root privs if running setuid */
  33        xsetuid(getuid());
  34
  35        return sock;
  36}
  37