xref: /netbsd-src/external/bsd/ntp/dist/sntp/utilities.c (revision eabc0478de71e4e011a5b4e0392741e01d491794)

/*	$NetBSD: utilities.c,v 1.7 2024/08/18 20:47:20 christos Exp $	*/

#include <config.h>
#include "utilities.h"
#include <assert.h>

/* Display a NTP packet in hex with leading address offset
 * e.g. offset: value, 0: ff 1: fe ... 255: 00
 */
void
pkt_output (
		struct pkt *dpkg,
		int pkt_length,
		FILE *output
	   )
{
	register int a;
	u_char *pkt;

	pkt = (u_char *)dpkg;

	fprintf(output, HLINE);

	for (a = 0; a < pkt_length; a++) {
		if (a > 0 && a % 8 == 0)
			fprintf(output, "\n");

		fprintf(output, "%3d: %02x  ", a, pkt[a]);
	}

	fprintf(output, "\n");
	fprintf(output, HLINE);
}

/* Output a long floating point value in hex in the style described above
 */
void
l_fp_output(
	l_fp *	ts,
	FILE *	output
	)
{
	fprintf(output, "%s\n", prettydate(ts));
}

/* Output a long floating point value in binary in the style described above
 */
void
l_fp_output_bin (
		l_fp *ts,
		FILE *output
		)
{
	register int a, b;

	fprintf(output, HLINE);

	for(a=0; a<8; a++) {
		short tmp = ((unsigned char *) ts)[a];
		tmp++;

		fprintf(output, "%i: ", a);

		for(b=7; b>=0; b--) {
			int texp = (int) pow(2, b);

			if(tmp - texp > 0) {
				fprintf(output, "1");
				tmp -= texp;
			}
			else {
				fprintf(output, "0");
			}
		}

		fprintf(output, " ");
	}

	fprintf(output, "\n");
	fprintf(output, HLINE);
}

/* Output a long floating point value in decimal in the style described above
 */
void
l_fp_output_dec (
		l_fp *ts,
		FILE *output
	    )
{
	register int a;

	fprintf(output, HLINE);

	for(a=0; a<8; a++)
		fprintf(output, "%i: %i \t", a, ((unsigned char *) ts)[a]);

	fprintf(output, "\n");
	fprintf(output, HLINE);

}

/* Convert a struct addrinfo to a string containing the address in style
 * of inet_ntoa
 */
char *
addrinfo_to_str (
	const struct addrinfo *addr
	)
{
	sockaddr_u	s;

	ZERO(s);
	memcpy(&s, addr->ai_addr, min(sizeof(s), addr->ai_addrlen));

	return ss_to_str(&s);
}


/* Convert a sockaddr_u to a string containing the address in
 * style of inet_ntoa
 * Why not switch callers to use stoa from libntp?  No free() needed
 * in that case.
 */
char *
ss_to_str(
	sockaddr_u *saddr
	)
{
	return estrdup(stoa(saddr));
}


/*
 * Converts a struct tv to a date string
 */
char *
tv_to_str(
	const struct timeval *tv
	)
{
	const size_t bufsize = 48;
	char *buf;
	time_t gmt_time, local_time;
	struct tm *ptm, tm_local;
	int hh, mm, lto, isdst;

	/*
	 * convert to struct tm in UTC, then intentionally feed
	 * that tm to mktime() which expects local time input, to
	 * derive the offset from UTC to local time.
	 * Need to retrieve dst flag from localtime first for mktime.
	 */
	gmt_time = tv->tv_sec;
	ptm = localtime(&gmt_time);
	memcpy (&tm_local, ptm, sizeof(tm_local));
	isdst = ptm->tm_isdst;
	ptm = gmtime(&gmt_time);
	ptm->tm_isdst = isdst;
	local_time = mktime(ptm);

	/* Local timezone offsets should never cause an overflow.  Yeah. */
	lto = difftime(local_time, gmt_time);
	lto /= 60;
	hh = lto / 60;
	mm = abs(lto % 60);

	buf = emalloc(bufsize);
	snprintf(buf, bufsize,
		 "%d-%.2d-%.2d %.2d:%.2d:%.2d.%.6d (%+03d%02d)",
		 tm_local.tm_year + 1900,
		 tm_local.tm_mon + 1,
		 tm_local.tm_mday,
		 tm_local.tm_hour,
		 tm_local.tm_min,
		 tm_local.tm_sec,
		 (int)tv->tv_usec,
		 hh,
		 mm);

	return buf;
}


/*
 *
 * hostnameaddr()
 *
 * Formats the hostname and resulting numeric IP address into a string,
 * avoiding duplication if the "hostname" was in fact a numeric address.
 *
 */
const char *
hostnameaddr(
	const char *		hostname,
	const sockaddr_u *	addr
	)
{
	const char *	addrtxt;
	char *		result;
	int		cnt;

	addrtxt = stoa(addr);
	LIB_GETBUF(result);
	if (strcmp(hostname, addrtxt))
		cnt = snprintf(result, LIB_BUFLENGTH, "%s %s",
			       hostname, addrtxt);
	else
		cnt = snprintf(result, LIB_BUFLENGTH, "%s", addrtxt);
	if (cnt >= LIB_BUFLENGTH)
		snprintf(result, LIB_BUFLENGTH,
			 "hostnameaddr ERROR have %d (%d needed)",
			 LIB_BUFLENGTH, cnt + 1);

	return result;
}