44 lines
908 B
C
44 lines
908 B
C
/*
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* numtohost - convert network number to host name.
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*/
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#include <config.h>
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#include <sys/types.h>
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h> /* ntohl */
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#endif
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#include "ntp_fp.h"
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#include "ntp_stdlib.h"
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#include "lib_strbuf.h"
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#define LOOPBACKNET 0x7f000000
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#define LOOPBACKHOST 0x7f000001
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#define LOOPBACKNETMASK 0xff000000
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char *
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numtohost(
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u_int32 netnum
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)
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{
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char *bp;
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struct hostent *hp;
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/*
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* This is really gross, but saves lots of hanging looking for
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* hostnames for the radio clocks. Don't bother looking up
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* addresses on the loopback network except for the loopback
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* host itself.
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*/
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if ((((ntohl(netnum) & LOOPBACKNETMASK) == LOOPBACKNET)
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&& (ntohl(netnum) != LOOPBACKHOST))
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|| ((hp = gethostbyaddr((char *)&netnum, sizeof netnum, AF_INET))
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== 0))
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return numtoa(netnum);
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LIB_GETBUF(bp);
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strlcpy(bp, hp->h_name, LIB_BUFLENGTH);
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return bp;
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}
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