res_debug.c

bind-3.2.

	const char *result;
	static char classbuf[20];

	result = sym_ntos(__p_class_syms, class, &success);
	if (success)
		return (result);
	if (class < 0 || class > 0xfff)
		return ("BADCLASS");
	sprintf(classbuf, "CLASS%d", class);
	return (classbuf);
}

/*
 * Return a mnemonic for an option
 */
const char *
p_option(u_long option) {
	static char nbuf[40];

	switch (option) {
	case RES_INIT:		return "init";
	case RES_DEBUG:		return "debug";
	case RES_AAONLY:	return "aaonly(unimpl)";
	case RES_USEVC:		return "usevc";
	case RES_PRIMARY:	return "primry(unimpl)";
	case RES_IGNTC:		return "igntc";
	case RES_RECURSE:	return "recurs";
	case RES_DEFNAMES:	return "defnam";
	case RES_STAYOPEN:	return "styopn";
	case RES_DNSRCH:	return "dnsrch";
	case RES_INSECURE1:	return "insecure1";
	case RES_INSECURE2:	return "insecure2";
	case RES_NOALIASES:	return "noaliases";
	case RES_USE_INET6:	return "inet6";
#ifdef RES_USE_EDNS0	/* KAME extension */
	case RES_USE_EDNS0:	return "edns0";
#endif
#ifdef RES_USE_DNAME
	case RES_USE_DNAME:	return "dname";
#endif
#ifdef RES_USE_DNSSEC
	case RES_USE_DNSSEC:	return "dnssec";
#endif
#ifdef RES_NOTLDQUERY
	case RES_NOTLDQUERY:	return "no-tld-query";
#endif

				/* XXX nonreentrant */
	default:		sprintf(nbuf, "?0x%lx?", (u_long)option);
				return (nbuf);
	}
}

/*
 * Return a mnemonic for a time to live.
 */
const char *
p_time(u_int32_t value) {
	static char nbuf[40];		/* XXX nonreentrant */

	if (ns_format_ttl(value, nbuf, sizeof nbuf) < 0)
		sprintf(nbuf, "%u", value);
	return (nbuf);
}

/*
 * Return a string for the rcode.
 */
const char *
p_rcode(int rcode) {
	return (sym_ntos(__p_rcode_syms, rcode, (int *)0));
}

/*
 * Return a string for a res_sockaddr_union.
 */
const char *
p_sockun(union res_sockaddr_union u, char *buf, size_t size) {
	char ret[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:123.123.123.123"];

	switch (u.sin.sin_family) {
	case AF_INET:
		inet_ntop(AF_INET, &u.sin.sin_addr, ret, sizeof ret);
		break;
#ifdef HAS_INET6_STRUCTS
	case AF_INET6:
		inet_ntop(AF_INET6, &u.sin6.sin6_addr, ret, sizeof ret);
		break;
#endif
	default:
		sprintf(ret, "[af%d]", u.sin.sin_family);
		break;
	}
	if (size > 0) {
		strncpy(buf, ret, size - 1);
		buf[size - 1] = '0';
	}
	return (buf);
}

/*
 * routines to convert between on-the-wire RR format and zone file format.
 * Does not contain conversion to/from decimal degrees; divide or multiply
 * by 60*60*1000 for that.
 */

static unsigned int poweroften[10] = {1, 10, 100, 1000, 10000, 100000,
				      1000000,10000000,100000000,1000000000};

/* takes an XeY precision/size value, returns a string representation. */
static const char *
precsize_ntoa(prec)
	u_int8_t prec;
{
	static char retbuf[sizeof "90000000.00"];	/* XXX nonreentrant */
	unsigned long val;
	int mantissa, exponent;

	mantissa = (int)((prec >> 4) & 0x0f) % 10;
	exponent = (int)((prec >> 0) & 0x0f) % 10;

	val = mantissa * poweroften[exponent];

	(void) sprintf(retbuf, "%lu.%.2lu", val/100, val%100);
	return (retbuf);
}

/* converts ascii size/precision X * 10**Y(cm) to 0xXY.  moves pointer. */
static u_int8_t
precsize_aton(const char **strptr) {
	unsigned int mval = 0, cmval = 0;
	u_int8_t retval = 0;
	const char *cp;
	int exponent;
	int mantissa;

	cp = *strptr;

	while (isdigit((unsigned char)*cp))
		mval = mval * 10 + (*cp++ - '0');

	if (*cp == '.') {		/* centimeters */
		cp++;
		if (isdigit((unsigned char)*cp)) {
			cmval = (*cp++ - '0') * 10;
			if (isdigit((unsigned char)*cp)) {
				cmval += (*cp++ - '0');
			}
		}
	}
	cmval = (mval * 100) + cmval;

	for (exponent = 0; exponent < 9; exponent++)
		if (cmval < poweroften[exponent+1])
			break;

	mantissa = cmval / poweroften[exponent];
	if (mantissa > 9)
		mantissa = 9;

	retval = (mantissa << 4) | exponent;

	*strptr = cp;

	return (retval);
}

/* converts ascii lat/lon to unsigned encoded 32-bit number.  moves pointer. */
static u_int32_t
latlon2ul(const char **latlonstrptr, int *which) {
	const char *cp;
	u_int32_t retval;
	int deg = 0, min = 0, secs = 0, secsfrac = 0;

	cp = *latlonstrptr;

	while (isdigit((unsigned char)*cp))
		deg = deg * 10 + (*cp++ - '0');

	while (isspace((unsigned char)*cp))
		cp++;

	if (!(isdigit((unsigned char)*cp)))
		goto fndhemi;

	while (isdigit((unsigned char)*cp))
		min = min * 10 + (*cp++ - '0');

	while (isspace((unsigned char)*cp))
		cp++;

	if (!(isdigit((unsigned char)*cp)))
		goto fndhemi;

	while (isdigit((unsigned char)*cp))
		secs = secs * 10 + (*cp++ - '0');

	if (*cp == '.') {		/* decimal seconds */
		cp++;
		if (isdigit((unsigned char)*cp)) {
			secsfrac = (*cp++ - '0') * 100;
			if (isdigit((unsigned char)*cp)) {
				secsfrac += (*cp++ - '0') * 10;
				if (isdigit((unsigned char)*cp)) {
					secsfrac += (*cp++ - '0');
				}
			}
		}
	}

	while (!isspace((unsigned char)*cp))	/* if any trailing garbage */
		cp++;

	while (isspace((unsigned char)*cp))
		cp++;

 fndhemi:
	switch (*cp) {
	case 'N': case 'n':
	case 'E': case 'e':
		retval = ((unsigned)1<<31)
			+ (((((deg * 60) + min) * 60) + secs) * 1000)
			+ secsfrac;
		break;
	case 'S': case 's':
	case 'W': case 'w':
		retval = ((unsigned)1<<31)
			- (((((deg * 60) + min) * 60) + secs) * 1000)
			- secsfrac;
		break;
	default:
		retval = 0;	/* invalid value -- indicates error */
		break;
	}

	switch (*cp) {
	case 'N': case 'n':
	case 'S': case 's':
		*which = 1;	/* latitude */
		break;
	case 'E': case 'e':
	case 'W': case 'w':
		*which = 2;	/* longitude */
		break;
	default:
		*which = 0;	/* error */
		break;
	}

	cp++;			/* skip the hemisphere */

	while (!isspace((unsigned char)*cp))	/* if any trailing garbage */
		cp++;

	while (isspace((unsigned char)*cp))	/* move to next field */
		cp++;

	*latlonstrptr = cp;

	return (retval);
}

/* converts a zone file representation in a string to an RDATA on-the-wire
 * representation. */
int
loc_aton(ascii, binary)
	const char *ascii;
	u_char *binary;
{
	const char *cp, *maxcp;
	u_char *bcp;

	u_int32_t latit = 0, longit = 0, alt = 0;
	u_int32_t lltemp1 = 0, lltemp2 = 0;
	int altmeters = 0, altfrac = 0, altsign = 1;
	u_int8_t hp = 0x16;	/* default = 1e6 cm = 10000.00m = 10km */
	u_int8_t vp = 0x13;	/* default = 1e3 cm = 10.00m */
	u_int8_t siz = 0x12;	/* default = 1e2 cm = 1.00m */
	int which1 = 0, which2 = 0;

	cp = ascii;
	maxcp = cp + strlen(ascii);

	lltemp1 = latlon2ul(&cp, &which1);

	lltemp2 = latlon2ul(&cp, &which2);

	switch (which1 + which2) {
	case 3:			/* 1 + 2, the only valid combination */
		if ((which1 == 1) && (which2 == 2)) { /* normal case */
			latit = lltemp1;
			longit = lltemp2;
		} else if ((which1 == 2) && (which2 == 1)) { /* reversed */
			longit = lltemp1;
			latit = lltemp2;
		} else {	/* some kind of brokenness */
			return (0);
		}
		break;
	default:		/* we didn't get one of each */
		return (0);
	}

	/* altitude */
	if (*cp == '-') {
		altsign = -1;
		cp++;
	}
    
	if (*cp == '+')
		cp++;

	while (isdigit((unsigned char)*cp))
		altmeters = altmeters * 10 + (*cp++ - '0');

	if (*cp == '.') {		/* decimal meters */
		cp++;
		if (isdigit((unsigned char)*cp)) {
			altfrac = (*cp++ - '0') * 10;
			if (isdigit((unsigned char)*cp)) {
				altfrac += (*cp++ - '0');
			}
		}
	}

	alt = (10000000 + (altsign * (altmeters * 100 + altfrac)));

	while (!isspace((unsigned char)*cp) && (cp < maxcp)) /* if trailing garbage or m */
		cp++;

	while (isspace((unsigned char)*cp) && (cp < maxcp))
		cp++;

	if (cp >= maxcp)
		goto defaults;

	siz = precsize_aton(&cp);
	
	while (!isspace((unsigned char)*cp) && (cp < maxcp))	/* if trailing garbage or m */
		cp++;

	while (isspace((unsigned char)*cp) && (cp < maxcp))
		cp++;

	if (cp >= maxcp)
		goto defaults;

	hp = precsize_aton(&cp);

	while (!isspace((unsigned char)*cp) && (cp < maxcp))	/* if trailing garbage or m */
		cp++;

	while (isspace((unsigned char)*cp) && (cp < maxcp))
		cp++;

	if (cp >= maxcp)
		goto defaults;

	vp = precsize_aton(&cp);

 defaults:

	bcp = binary;
	*bcp++ = (u_int8_t) 0;	/* version byte */
	*bcp++ = siz;
	*bcp++ = hp;
	*bcp++ = vp;
	PUTLONG(latit,bcp);
	PUTLONG(longit,bcp);
	PUTLONG(alt,bcp);
    
	return (16);		/* size of RR in octets */
}

/* takes an on-the-wire LOC RR and formats it in a human readable format. */
const char *
loc_ntoa(binary, ascii)
	const u_char *binary;
	char *ascii;
{
	static const char *error = "?";
	static char tmpbuf[sizeof
"1000 60 60.000 N 1000 60 60.000 W -12345678.00m 90000000.00m 90000000.00m 90000000.00m"];
	const u_char *cp = binary;

	int latdeg, latmin, latsec, latsecfrac;
	int longdeg, longmin, longsec, longsecfrac;
	char northsouth, eastwest;
	const char *altsign;
	int altmeters, altfrac;

	const u_int32_t referencealt = 100000 * 100;

	int32_t latval, longval, altval;
	u_int32_t templ;
	u_int8_t sizeval, hpval, vpval, versionval;
    
	char *sizestr, *hpstr, *vpstr;

	versionval = *cp++;

	if (ascii == NULL)
		ascii = tmpbuf;

	if (versionval) {
		(void) sprintf(ascii, "; error: unknown LOC RR version");
		return (ascii);
	}

	sizeval = *cp++;

	hpval = *cp++;
	vpval = *cp++;

	GETLONG(templ, cp);
	latval = (templ - ((unsigned)1<<31));

	GETLONG(templ, cp);
	longval = (templ - ((unsigned)1<<31));

	GETLONG(templ, cp);
	if (templ < referencealt) { /* below WGS 84 spheroid */
		altval = referencealt - templ;
		altsign = "-";
	} else {
		altval = templ - referencealt;
		altsign = "";
	}

	if (latval < 0) {
		northsouth = 'S';
		latval = -latval;
	} else
		northsouth = 'N';

	latsecfrac = latval % 1000;
	latval = latval / 1000;
	latsec = latval % 60;
	latval = latval / 60;
	latmin = latval % 60;
	latval = latval / 60;
	latdeg = latval;

	if (longval < 0) {
		eastwest = 'W';
		longval = -longval;
	} else
		eastwest = 'E';

	longsecfrac = longval % 1000;
	longval = longval / 1000;
	longsec = longval % 60;
	longval = longval / 60;
	longmin = longval % 60;
	longval = longval / 60;
	longdeg = longval;

	altfrac = altval % 100;
	altmeters = (altval / 100);

	sizestr = strdup(precsize_ntoa(sizeval));
	hpstr = strdup(precsize_ntoa(hpval));
	vpstr = strdup(precsize_ntoa(vpval));

	sprintf(ascii,
	    "%d %.2d %.2d.%.3d %c %d %.2d %.2d.%.3d %c %s%d.%.2dm %sm %sm %sm",
		latdeg, latmin, latsec, latsecfrac, northsouth,
		longdeg, longmin, longsec, longsecfrac, eastwest,
		altsign, altmeters, altfrac,
		(sizestr != NULL) ? sizestr : error,
		(hpstr != NULL) ? hpstr : error,
		(vpstr != NULL) ? vpstr : error);

	if (sizestr != NULL)
		free(sizestr);
	if (hpstr != NULL)
		free(hpstr);
	if (vpstr != NULL)
		free(vpstr);

	return (ascii);
}


/* Return the number of DNS hierarchy levels in the name. */
int
dn_count_labels(const char *name) {
	int i, len, count;

	len = strlen(name);
	for (i = 0, count = 0; i < len; i++) {
		/* XXX need to check for \. or use named's nlabels(). */
		if (name[i] == '.')
			count++;
	}

	/* don't count initial wildcard */
	if (name[0] == '*')
		if (count)
			count--;

	/* don't count the null label for root. */
	/* if terminating '.' not found, must adjust */
	/* count to include last label */
	if (len > 0 && name[len-1] != '.')
		count++;
	return (count);
}


/* 
 * Make dates expressed in seconds-since-Jan-1-1970 easy to read.  
 * SIG records are required to be printed like this, by the Secure DNS RFC.
 */
char *
p_secstodate (u_long secs) {
	/* XXX nonreentrant */
	static char output[15];		/* YYYYMMDDHHMMSS and null */
	time_t clock = secs;
	struct tm *time;
	
#ifdef HAVE_TIME_R
	gmtime_r(&clock, &time);
#else
	time = gmtime(&clock);
#endif
	time->tm_year += 1900;
	time->tm_mon += 1;
	sprintf(output, "%04d%02d%02d%02d%02d%02d",
		time->tm_year, time->tm_mon, time->tm_mday,
		time->tm_hour, time->tm_min, time->tm_sec);
	return (output);
}

u_int16_t
res_nametoclass(const char *buf, int *successp) {
	unsigned long result;
	char *endptr;
	int success;

	result = sym_ston(__p_class_syms, buf, &success);
	if (success)
		goto done;

	if (strncasecmp(buf, "CLASS", 5) != 0 ||
	    !isdigit((unsigned char)buf[5]))
		goto done;
	errno = 0;
	result = strtoul(buf + 5, &endptr, 10);
	if (errno == 0 && *endptr == '\0' && result <= 0xffff)
		success = 1;
 done:
	if (successp)
		*successp = success;
	return (result);
}

u_int16_t
res_nametotype(const char *buf, int *successp) {
	unsigned long result;
	char *endptr;
	int success;

	result = sym_ston(__p_type_syms, buf, &success);
	if (success)
		goto done;

	if (strncasecmp(buf, "type", 4) != 0 ||
	    !isdigit((unsigned char)buf[4]))
		goto done;
	errno = 0;
	result = strtoul(buf + 4, &endptr, 10);
	if (errno == 0 && *endptr == '\0' && result <= 0xffff)
		success = 1;
 done:
	if (successp)
		*successp = success;
	return (result);
}