1/* vi: set sw=4 ts=4: */ 2/* 3 * Utility routines. 4 * 5 * create raw socket for icmp protocol test permision 6 * and drop root privilegies if running setuid 7 * 8 */ 9 10#include <sys/types.h> 11#include <netdb.h> 12#include <sys/socket.h> 13#include <errno.h> 14#include <unistd.h> 15#include "libbb.h" 16 17int create_icmp_socket(void) 18{ 19 struct protoent *proto; 20 int sock; 21 22 proto = getprotobyname("icmp"); 23 /* if getprotobyname failed, just silently force 24 * proto->p_proto to have the correct value for "icmp" */ 25 if ((sock = socket(AF_INET, SOCK_RAW, 26 (proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */ 27 if (errno == EPERM) 28 error_msg_and_die("permission denied. (are you root?)"); 29 else 30 perror_msg_and_die(can_not_create_raw_socket); 31 } 32 33 /* drop root privs if running setuid */ 34 setuid(getuid()); 35 36 return sock; 37} 38