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      1 /*	$NetBSD: numtoa.c,v 1.6 2024/08/18 20:47:13 christos Exp $	*/
      2 
      3 /*
      4  * numtoa - return asciized network numbers store in local array space
      5  */
      6 #include <config.h>
      7 
      8 #include <sys/types.h>
      9 #ifdef HAVE_NETINET_IN_H
     10 #include <netinet/in.h>		/* ntohl */
     11 #endif
     12 
     13 #include <stdio.h>
     14 #include <ctype.h>
     15 
     16 #include "ntp_fp.h"
     17 #include "ntp_stdlib.h"
     18 
     19 char *
     20 numtoa(
     21 	u_int32 num
     22 	)
     23 {
     24 	register u_int32 netnum;
     25 	register char *buf;
     26 
     27 	netnum = ntohl(num);
     28 	LIB_GETBUF(buf);
     29 	snprintf(buf, LIB_BUFLENGTH, "%lu.%lu.%lu.%lu",
     30 		 ((u_long)netnum >> 24) & 0xff,
     31 		 ((u_long)netnum >> 16) & 0xff,
     32 		 ((u_long)netnum >> 8) & 0xff,
     33 		 (u_long)netnum & 0xff);
     34 	return buf;
     35 }
     36 
     37 
     38 /*
     39  * Convert a refid & stratum to a string.  If stratum is negative and the
     40  * refid consists entirely of graphic chars, up to an optional
     41  * terminating zero, display as text similar to stratum 0 & 1.
     42  */
     43 const char *
     44 refid_str(
     45 	u_int32	refid,
     46 	int	stratum
     47 	)
     48 {
     49 	char *	text;
     50 	size_t	tlen;
     51 	char *	cp;
     52 	int	printable;
     53 
     54 	/*
     55 	 * ntpd can have stratum = 0 and refid 127.0.0.1 in orphan mode.
     56 	 * https://bugs.ntp.org/3854.  Mirror the refid logic in timer().
     57 	 */
     58 	if (0 == stratum && LOOPBACKADR_N == refid) {
     59 		return ".ORPH.";
     60 	}
     61 	printable = FALSE;
     62 	if (stratum < 2) {
     63 		text = lib_getbuf();
     64 		text[0] = '.';
     65 		memcpy(&text[1], &refid, sizeof(refid));
     66 		text[1 + sizeof(refid)] = '\0';
     67 		tlen = strlen(text);
     68 		text[tlen] = '.';
     69 		text[tlen + 1] = '\0';
     70 		/*
     71 		 * Now make sure the contents are 'graphic'.
     72 		 *
     73 		 * This refid is expected to be up to 4 printable ASCII.
     74 		 * isgraph() is similar to isprint() but excludes space.
     75 		 * If any character is not graphic, replace it with a '?'.
     76 		 * This will at least alert the viewer of a problem.
     77 		 */
     78 		for (cp = text + 1; '\0' != *cp; ++cp) {
     79 			if (!isgraph((int)*cp)) {
     80 				printable = FALSE;
     81 				*cp = '?';
     82 			}
     83 		}
     84 		if (   (stratum < 0 && printable)
     85 		    || stratum < 2) {
     86 			return text;
     87 		}
     88 	}
     89 	return numtoa(refid);
     90 }
     91 
     92