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Diffstat (limited to 'freebsd/lib/libc/nameser/ns_name.c')
-rw-r--r--freebsd/lib/libc/nameser/ns_name.c255
1 files changed, 219 insertions, 36 deletions
diff --git a/freebsd/lib/libc/nameser/ns_name.c b/freebsd/lib/libc/nameser/ns_name.c
index 181a9756..fa1a32e3 100644
--- a/freebsd/lib/libc/nameser/ns_name.c
+++ b/freebsd/lib/libc/nameser/ns_name.c
@@ -18,8 +18,10 @@
*/
#ifndef lint
-static const char rcsid[] = "$Id: ns_name.c,v 1.8.18.2 2005/04/27 05:01:08 sra Exp $";
+static const char rcsid[] = "$Id: ns_name.c,v 1.11 2009/01/23 19:59:16 each Exp $";
#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
#include "port_before.h"
@@ -123,7 +125,7 @@ ns_name_ntop(const u_char *src, char *dst, size_t dstsiz)
}
if ((l = labellen(cp - 1)) < 0) {
errno = EMSGSIZE; /*%< XXX */
- return(-1);
+ return (-1);
}
if (dn + l >= eom) {
errno = EMSGSIZE;
@@ -135,12 +137,12 @@ ns_name_ntop(const u_char *src, char *dst, size_t dstsiz)
if (n != DNS_LABELTYPE_BITSTRING) {
/* XXX: labellen should reject this case */
errno = EINVAL;
- return(-1);
+ return (-1);
}
if ((m = decode_bitstring(&cp, dn, eom)) < 0)
{
errno = EMSGSIZE;
- return(-1);
+ return (-1);
}
dn += m;
continue;
@@ -199,10 +201,25 @@ ns_name_ntop(const u_char *src, char *dst, size_t dstsiz)
* notes:
*\li Enforces label and domain length limits.
*/
+int
+ns_name_pton(const char *src, u_char *dst, size_t dstsiz) {
+ return (ns_name_pton2(src, dst, dstsiz, NULL));
+}
+/*
+ * ns_name_pton2(src, dst, dstsiz, *dstlen)
+ * Convert a ascii string into an encoded domain name as per RFC1035.
+ * return:
+ * -1 if it fails
+ * 1 if string was fully qualified
+ * 0 is string was not fully qualified
+ * side effects:
+ * fills in *dstlen (if non-NULL)
+ * notes:
+ * Enforces label and domain length limits.
+ */
int
-ns_name_pton(const char *src, u_char *dst, size_t dstsiz)
-{
+ns_name_pton2(const char *src, u_char *dst, size_t dstsiz, size_t *dstlen) {
u_char *label, *bp, *eom;
int c, n, escaped, e = 0;
char *cp;
@@ -217,13 +234,13 @@ ns_name_pton(const char *src, u_char *dst, size_t dstsiz)
if (c == '[') { /*%< start a bit string label */
if ((cp = strchr(src, ']')) == NULL) {
errno = EINVAL; /*%< ??? */
- return(-1);
+ return (-1);
}
if ((e = encode_bitsring(&src, cp + 2,
&label, &bp, eom))
!= 0) {
errno = e;
- return(-1);
+ return (-1);
}
escaped = 0;
label = bp++;
@@ -231,7 +248,7 @@ ns_name_pton(const char *src, u_char *dst, size_t dstsiz)
goto done;
else if (c != '.') {
errno = EINVAL;
- return(-1);
+ return (-1);
}
continue;
}
@@ -283,6 +300,8 @@ ns_name_pton(const char *src, u_char *dst, size_t dstsiz)
errno = EMSGSIZE;
return (-1);
}
+ if (dstlen != NULL)
+ *dstlen = (bp - dst);
return (1);
}
if (c == 0 || *src == '.') {
@@ -320,6 +339,8 @@ ns_name_pton(const char *src, u_char *dst, size_t dstsiz)
errno = EMSGSIZE;
return (-1);
}
+ if (dstlen != NULL)
+ *dstlen = (bp - dst);
return (0);
}
@@ -367,7 +388,7 @@ ns_name_ntol(const u_char *src, u_char *dst, size_t dstsiz)
}
for ((void)NULL; l > 0; l--) {
c = *cp++;
- if (isupper(c))
+ if (isascii(c) && isupper(c))
*dn++ = tolower(c);
else
*dn++ = c;
@@ -387,6 +408,21 @@ int
ns_name_unpack(const u_char *msg, const u_char *eom, const u_char *src,
u_char *dst, size_t dstsiz)
{
+ return (ns_name_unpack2(msg, eom, src, dst, dstsiz, NULL));
+}
+
+/*
+ * ns_name_unpack2(msg, eom, src, dst, dstsiz, *dstlen)
+ * Unpack a domain name from a message, source may be compressed.
+ * return:
+ * -1 if it fails, or consumed octets if it succeeds.
+ * side effect:
+ * fills in *dstlen (if non-NULL).
+ */
+int
+ns_name_unpack2(const u_char *msg, const u_char *eom, const u_char *src,
+ u_char *dst, size_t dstsiz, size_t *dstlen)
+{
const u_char *srcp, *dstlim;
u_char *dstp;
int n, len, checked, l;
@@ -409,7 +445,7 @@ ns_name_unpack(const u_char *msg, const u_char *eom, const u_char *src,
/* Limit checks. */
if ((l = labellen(srcp - 1)) < 0) {
errno = EMSGSIZE;
- return(-1);
+ return (-1);
}
if (dstp + l + 1 >= dstlim || srcp + l >= eom) {
errno = EMSGSIZE;
@@ -429,11 +465,12 @@ ns_name_unpack(const u_char *msg, const u_char *eom, const u_char *src,
}
if (len < 0)
len = srcp - src + 1;
- srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff));
- if (srcp < msg || srcp >= eom) { /*%< Out of range. */
+ l = ((n & 0x3f) << 8) | (*srcp & 0xff);
+ if (l >= eom - msg) { /*%< Out of range. */
errno = EMSGSIZE;
return (-1);
}
+ srcp = msg + l;
checked += 2;
/*
* Check for loops in the compressed name;
@@ -451,7 +488,9 @@ ns_name_unpack(const u_char *msg, const u_char *eom, const u_char *src,
return (-1); /*%< flag error */
}
}
- *dstp = '\0';
+ *dstp++ = 0;
+ if (dstlen != NULL)
+ *dstlen = dstp - dst;
if (len < 0)
len = srcp - src;
return (len);
@@ -510,7 +549,7 @@ ns_name_pack(const u_char *src, u_char *dst, int dstsiz,
}
if ((l0 = labellen(srcp)) < 0) {
errno = EINVAL;
- return(-1);
+ return (-1);
}
l += l0 + 1;
if (l > MAXCDNAME) {
@@ -657,7 +696,7 @@ ns_name_skip(const u_char **ptrptr, const u_char *eom)
case NS_TYPE_ELT: /*%< EDNS0 extended label */
if ((l = labellen(cp - 1)) < 0) {
errno = EMSGSIZE; /*%< XXX */
- return(-1);
+ return (-1);
}
cp += l;
continue;
@@ -678,6 +717,150 @@ ns_name_skip(const u_char **ptrptr, const u_char *eom)
return (0);
}
+/* Find the number of octets an nname takes up, including the root label.
+ * (This is basically ns_name_skip() without compression-pointer support.)
+ * ((NOTE: can only return zero if passed-in namesiz argument is zero.))
+ */
+ssize_t
+ns_name_length(ns_nname_ct nname, size_t namesiz) {
+ ns_nname_ct orig = nname;
+ u_int n;
+
+ while (namesiz-- > 0 && (n = *nname++) != 0) {
+ if ((n & NS_CMPRSFLGS) != 0) {
+ errno = EISDIR;
+ return (-1);
+ }
+ if (n > namesiz) {
+ errno = EMSGSIZE;
+ return (-1);
+ }
+ nname += n;
+ namesiz -= n;
+ }
+ return (nname - orig);
+}
+
+/* Compare two nname's for equality. Return -1 on error (setting errno).
+ */
+int
+ns_name_eq(ns_nname_ct a, size_t as, ns_nname_ct b, size_t bs) {
+ ns_nname_ct ae = a + as, be = b + bs;
+ int ac, bc;
+
+ while (ac = *a, bc = *b, ac != 0 && bc != 0) {
+ if ((ac & NS_CMPRSFLGS) != 0 || (bc & NS_CMPRSFLGS) != 0) {
+ errno = EISDIR;
+ return (-1);
+ }
+ if (a + ac >= ae || b + bc >= be) {
+ errno = EMSGSIZE;
+ return (-1);
+ }
+ if (ac != bc || strncasecmp((const char *) ++a,
+ (const char *) ++b, ac) != 0)
+ return (0);
+ a += ac, b += bc;
+ }
+ return (ac == 0 && bc == 0);
+}
+
+/* Is domain "A" owned by (at or below) domain "B"?
+ */
+int
+ns_name_owned(ns_namemap_ct a, int an, ns_namemap_ct b, int bn) {
+ /* If A is shorter, it cannot be owned by B. */
+ if (an < bn)
+ return (0);
+
+ /* If they are unequal before the length of the shorter, A cannot... */
+ while (bn > 0) {
+ if (a->len != b->len ||
+ strncasecmp((const char *) a->base,
+ (const char *) b->base, a->len) != 0)
+ return (0);
+ a++, an--;
+ b++, bn--;
+ }
+
+ /* A might be longer or not, but either way, B owns it. */
+ return (1);
+}
+
+/* Build an array of <base,len> tuples from an nname, top-down order.
+ * Return the number of tuples (labels) thus discovered.
+ */
+int
+ns_name_map(ns_nname_ct nname, size_t namelen, ns_namemap_t map, int mapsize) {
+ u_int n;
+ int l;
+
+ n = *nname++;
+ namelen--;
+
+ /* Root zone? */
+ if (n == 0) {
+ /* Extra data follows name? */
+ if (namelen > 0) {
+ errno = EMSGSIZE;
+ return (-1);
+ }
+ return (0);
+ }
+
+ /* Compression pointer? */
+ if ((n & NS_CMPRSFLGS) != 0) {
+ errno = EISDIR;
+ return (-1);
+ }
+
+ /* Label too long? */
+ if (n > namelen) {
+ errno = EMSGSIZE;
+ return (-1);
+ }
+
+ /* Recurse to get rest of name done first. */
+ l = ns_name_map(nname + n, namelen - n, map, mapsize);
+ if (l < 0)
+ return (-1);
+
+ /* Too many labels? */
+ if (l >= mapsize) {
+ errno = ENAMETOOLONG;
+ return (-1);
+ }
+
+ /* We're on our way back up-stack, store current map data. */
+ map[l].base = nname;
+ map[l].len = n;
+ return (l + 1);
+}
+
+/* Count the labels in a domain name. Root counts, so COM. has two. This
+ * is to make the result comparable to the result of ns_name_map().
+ */
+int
+ns_name_labels(ns_nname_ct nname, size_t namesiz) {
+ int ret = 0;
+ u_int n;
+
+ while (namesiz-- > 0 && (n = *nname++) != 0) {
+ if ((n & NS_CMPRSFLGS) != 0) {
+ errno = EISDIR;
+ return (-1);
+ }
+ if (n > namesiz) {
+ errno = EMSGSIZE;
+ return (-1);
+ }
+ nname += n;
+ namesiz -= n;
+ ret++;
+ }
+ return (ret + 1);
+}
+
/* Private. */
/*%
@@ -808,7 +991,7 @@ decode_bitstring(const unsigned char **cpp, char *dn, const char *eom)
plen = (blen + 3) / 4;
plen += sizeof("\\[x/]") + (blen > 99 ? 3 : (blen > 9) ? 2 : 1);
if (dn + plen >= eom)
- return(-1);
+ return (-1);
cp++;
i = SPRINTF((dn, "\\[x"));
@@ -841,12 +1024,12 @@ decode_bitstring(const unsigned char **cpp, char *dn, const char *eom)
dn += i;
*cpp = cp;
- return(dn - beg);
+ return (dn - beg);
}
static int
encode_bitsring(const char **bp, const char *end, unsigned char **labelp,
- unsigned char ** dst, unsigned const char *eom)
+ unsigned char ** dst, unsigned const char *eom)
{
int afterslash = 0;
const char *cp = *bp;
@@ -860,23 +1043,23 @@ encode_bitsring(const char **bp, const char *end, unsigned char **labelp,
/* a bitstring must contain at least 2 characters */
if (end - cp < 2)
- return(EINVAL);
+ return (EINVAL);
/* XXX: currently, only hex strings are supported */
if (*cp++ != 'x')
- return(EINVAL);
+ return (EINVAL);
if (!isxdigit((*cp) & 0xff)) /*%< reject '\[x/BLEN]' */
- return(EINVAL);
+ return (EINVAL);
for (tp = *dst + 1; cp < end && tp < eom; cp++) {
switch((c = *cp)) {
case ']': /*%< end of the bitstring */
if (afterslash) {
if (beg_blen == NULL)
- return(EINVAL);
+ return (EINVAL);
blen = (int)strtol(beg_blen, &end_blen, 10);
if (*end_blen != ']')
- return(EINVAL);
+ return (EINVAL);
}
if (count)
*tp++ = ((value << 4) & 0xff);
@@ -888,24 +1071,24 @@ encode_bitsring(const char **bp, const char *end, unsigned char **labelp,
default:
if (afterslash) {
if (!isdigit(c&0xff))
- return(EINVAL);
+ return (EINVAL);
if (beg_blen == NULL) {
if (c == '0') {
/* blen never begings with 0 */
- return(EINVAL);
+ return (EINVAL);
}
beg_blen = cp;
}
} else {
if (!isxdigit(c&0xff))
- return(EINVAL);
+ return (EINVAL);
value <<= 4;
value += digitvalue[(int)c];
count += 4;
tbcount += 4;
if (tbcount > 256)
- return(EINVAL);
+ return (EINVAL);
if (count == 8) {
*tp++ = value;
count = 0;
@@ -916,7 +1099,7 @@ encode_bitsring(const char **bp, const char *end, unsigned char **labelp,
}
done:
if (cp >= end || tp >= eom)
- return(EMSGSIZE);
+ return (EMSGSIZE);
/*
* bit length validation:
@@ -930,10 +1113,10 @@ encode_bitsring(const char **bp, const char *end, unsigned char **labelp,
int traillen;
if (((blen + 3) & ~3) != tbcount)
- return(EINVAL);
+ return (EINVAL);
traillen = tbcount - blen; /*%< between 0 and 3 */
if (((value << (8 - traillen)) & 0xff) != 0)
- return(EINVAL);
+ return (EINVAL);
}
else
blen = tbcount;
@@ -947,7 +1130,7 @@ encode_bitsring(const char **bp, const char *end, unsigned char **labelp,
*bp = cp;
*dst = tp;
- return(0);
+ return (0);
}
static int
@@ -958,18 +1141,18 @@ labellen(const u_char *lp)
if ((l & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
/* should be avoided by the caller */
- return(-1);
+ return (-1);
}
if ((l & NS_CMPRSFLGS) == NS_TYPE_ELT) {
if (l == DNS_LABELTYPE_BITSTRING) {
if ((bitlen = *(lp + 1)) == 0)
bitlen = 256;
- return((bitlen + 7 ) / 8 + 1);
+ return ((bitlen + 7 ) / 8 + 1);
}
- return(-1); /*%< unknwon ELT */
+ return (-1); /*%< unknwon ELT */
}
- return(l);
+ return (l);
}
/*! \file */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-04 03:47:54 +0000