40 lines
853 B
C
40 lines
853 B
C
/*
|
|
* numtohost - convert network number to host name.
|
|
*/
|
|
#include <netdb.h>
|
|
|
|
#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;
|
|
}
|