/* $NetBSD: numtohost.c,v 1.1.1.1 2000/03/29 12:38:50 simonb Exp $ */ /* * numtohost - convert network number to host name. */ #include #include "ntp_fp.h" #include "ntp_stdlib.h" #include "lib_strbuf.h" #define LOOPBACKNET 0x7f000000 #define LOOPBACKHOST 0x7f000001 #define LOOPBACKNETMASK 0xff000000 char * numtohost( u_int32 netnum ) { char *bp; struct hostent *hp; /* * This is really gross, but saves lots of hanging looking for * hostnames for the radio clocks. Don't bother looking up * addresses on the loopback network except for the loopback * host itself. */ if ((((ntohl(netnum) & LOOPBACKNETMASK) == LOOPBACKNET) && (ntohl(netnum) != LOOPBACKHOST)) || ((hp = gethostbyaddr((char *)&netnum, sizeof netnum, AF_INET)) == 0)) return numtoa(netnum); LIB_GETBUF(bp); bp[LIB_BUFLENGTH-1] = '\0'; (void) strncpy(bp, hp->h_name, LIB_BUFLENGTH-1); return bp; }