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-rw-r--r--resolv/Makefile1
-rw-r--r--resolv/Versions4
-rw-r--r--resolv/ns_name.c194
-rw-r--r--resolv/ns_name_pack.c202
4 files changed, 206 insertions, 195 deletions
diff --git a/resolv/Makefile b/resolv/Makefile
index 7839e1f..8bb2585 100644
--- a/resolv/Makefile
+++ b/resolv/Makefile
@@ -33,6 +33,7 @@ routines := \
inet_ntop \
inet_pton \
ns_name_ntop \
+ ns_name_pack \
ns_name_pton \
ns_name_skip \
ns_name_uncompress \
diff --git a/resolv/Versions b/resolv/Versions
index 770a2b8..8ea42da 100644
--- a/resolv/Versions
+++ b/resolv/Versions
@@ -26,6 +26,7 @@ libc {
}
GLIBC_2.9 {
ns_name_ntop;
+ ns_name_pack;
ns_name_pton;
ns_name_skip;
ns_name_uncompress;
@@ -39,6 +40,7 @@ libc {
getaddrinfo_a;
%endif
ns_name_ntop;
+ ns_name_pack;
ns_name_pton;
ns_name_skip;
ns_name_uncompress;
@@ -52,6 +54,7 @@ libc {
__inet_aton_exact;
__inet_pton_length;
__ns_name_ntop;
+ __ns_name_pack;
__ns_name_pton;
__ns_name_skip;
__ns_name_uncompress;
@@ -154,7 +157,6 @@ libresolv {
ns_msg_getflag;
ns_name_compress;
ns_name_ntol;
- ns_name_pack;
ns_name_pton;
ns_name_rollback;
ns_name_skip;
diff --git a/resolv/ns_name.c b/resolv/ns_name.c
index 9f7ca4a..f1a84ad 100644
--- a/resolv/ns_name.c
+++ b/resolv/ns_name.c
@@ -31,9 +31,6 @@
/* Forward. */
-static int dn_find(const u_char *, const u_char *,
- const u_char * const *,
- const u_char * const *);
static int labellen(const u_char *);
/* Public. */
@@ -93,118 +90,6 @@ ns_name_ntol(const u_char *src, u_char *dst, size_t dstsiz)
}
/*%
- * Pack domain name 'domain' into 'comp_dn'.
- *
- * return:
- *\li Size of the compressed name, or -1.
- *
- * notes:
- *\li 'dnptrs' is an array of pointers to previous compressed names.
- *\li dnptrs[0] is a pointer to the beginning of the message. The array
- * ends with NULL.
- *\li 'lastdnptr' is a pointer to the end of the array pointed to
- * by 'dnptrs'.
- *
- * Side effects:
- *\li The list of pointers in dnptrs is updated for labels inserted into
- * the message as we compress the name. If 'dnptr' is NULL, we don't
- * try to compress names. If 'lastdnptr' is NULL, we don't update the
- * list.
- */
-int
-ns_name_pack(const u_char *src, u_char *dst, int dstsiz,
- const u_char **dnptrs, const u_char **lastdnptr)
-{
- u_char *dstp;
- const u_char **cpp, **lpp, *eob, *msg;
- const u_char *srcp;
- int n, l, first = 1;
-
- srcp = src;
- dstp = dst;
- eob = dstp + dstsiz;
- lpp = cpp = NULL;
- if (dnptrs != NULL) {
- if ((msg = *dnptrs++) != NULL) {
- for (cpp = dnptrs; *cpp != NULL; cpp++)
- (void)NULL;
- lpp = cpp; /*%< end of list to search */
- }
- } else
- msg = NULL;
-
- /* make sure the domain we are about to add is legal */
- l = 0;
- do {
- int l0;
-
- n = *srcp;
- if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
- __set_errno (EMSGSIZE);
- return (-1);
- }
- if ((l0 = labellen(srcp)) < 0) {
- __set_errno (EINVAL);
- return(-1);
- }
- l += l0 + 1;
- if (l > MAXCDNAME) {
- __set_errno (EMSGSIZE);
- return (-1);
- }
- srcp += l0 + 1;
- } while (n != 0);
-
- /* from here on we need to reset compression pointer array on error */
- srcp = src;
- do {
- /* Look to see if we can use pointers. */
- n = *srcp;
- if (n != 0 && msg != NULL) {
- l = dn_find(srcp, msg, (const u_char * const *)dnptrs,
- (const u_char * const *)lpp);
- if (l >= 0) {
- if (dstp + 1 >= eob) {
- goto cleanup;
- }
- *dstp++ = (l >> 8) | NS_CMPRSFLGS;
- *dstp++ = l % 256;
- return (dstp - dst);
- }
- /* Not found, save it. */
- if (lastdnptr != NULL && cpp < lastdnptr - 1 &&
- (dstp - msg) < 0x4000 && first) {
- *cpp++ = dstp;
- *cpp = NULL;
- first = 0;
- }
- }
- /* copy label to buffer */
- if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
- /* Should not happen. */
- goto cleanup;
- }
- n = labellen(srcp);
- if (n + 1 > eob - dstp) {
- goto cleanup;
- }
- memcpy(dstp, srcp, n + 1);
- srcp += n + 1;
- dstp += n + 1;
- } while (n != 0);
-
- if (dstp > eob) {
-cleanup:
- if (msg != NULL)
- *lpp = NULL;
- __set_errno (EMSGSIZE);
- return (-1);
- }
- return (dstp - dst);
-}
-libresolv_hidden_def (ns_name_pack)
-
-/*%
* Compress a domain name into wire format, using compression pointers.
*
* return:
@@ -250,85 +135,6 @@ ns_name_rollback(const u_char *src, const u_char **dnptrs,
/* Private. */
-/*%
- * Thinking in noninternationalized USASCII (per the DNS spec),
- * convert this character to lower case if it's upper case.
- */
-static int
-mklower(int ch) {
- if (ch >= 0x41 && ch <= 0x5A)
- return (ch + 0x20);
- return (ch);
-}
-
-/*%
- * Search for the counted-label name in an array of compressed names.
- *
- * return:
- *\li offset from msg if found, or -1.
- *
- * notes:
- *\li dnptrs is the pointer to the first name on the list,
- *\li not the pointer to the start of the message.
- */
-static int
-dn_find(const u_char *domain, const u_char *msg,
- const u_char * const *dnptrs,
- const u_char * const *lastdnptr)
-{
- const u_char *dn, *cp, *sp;
- const u_char * const *cpp;
- u_int n;
-
- for (cpp = dnptrs; cpp < lastdnptr; cpp++) {
- sp = *cpp;
- /*
- * terminate search on:
- * root label
- * compression pointer
- * unusable offset
- */
- while (*sp != 0 && (*sp & NS_CMPRSFLGS) == 0 &&
- (sp - msg) < 0x4000) {
- dn = domain;
- cp = sp;
- while ((n = *cp++) != 0) {
- /*
- * check for indirection
- */
- switch (n & NS_CMPRSFLGS) {
- case 0: /*%< normal case, n == len */
- n = labellen(cp - 1); /*%< XXX */
- if (n != *dn++)
- goto next;
-
- for ((void)NULL; n > 0; n--)
- if (mklower(*dn++) !=
- mklower(*cp++))
- goto next;
- /* Is next root for both ? */
- if (*dn == '\0' && *cp == '\0')
- return (sp - msg);
- if (*dn)
- continue;
- goto next;
- case NS_CMPRSFLGS: /*%< indirection */
- cp = msg + (((n & 0x3f) << 8) | *cp);
- break;
-
- default: /*%< illegal type */
- __set_errno (EMSGSIZE);
- return (-1);
- }
- }
- next: ;
- sp += *sp + 1;
- }
- }
- __set_errno (ENOENT);
- return (-1);
-}
-
/* Return the length of the encoded label starting at LP, or -1 for
compression references and extended label types. */
static int
diff --git a/resolv/ns_name_pack.c b/resolv/ns_name_pack.c
new file mode 100644
index 0000000..3200b78
--- /dev/null
+++ b/resolv/ns_name_pack.c
@@ -0,0 +1,202 @@
+/* Compression of DNS domain names.
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1996,1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <arpa/nameser.h>
+#include <errno.h>
+#include <string.h>
+#include <shlib-compat.h>
+
+/* Thinking in noninternationalized USASCII (per the DNS spec),
+ convert this character to lower case if it's upper case. */
+static int
+mklower (int ch)
+{
+ if (ch >= 'A' && ch <= 'Z')
+ return ch - 'A' + 'a';
+ return ch;
+}
+
+/* Search for the counted-label name in an array of compressed names.
+ Returns the offset from MSG if found, or -1.
+
+ DNPTRS is the pointer to the first name on the list, not the
+ pointer to the start of the message. */
+static int
+dn_find (const unsigned char *domain, const unsigned char *msg,
+ const unsigned char **dnptrs,
+ const unsigned char **lastdnptr)
+{
+ const unsigned char *dn, *cp, *sp;
+ const unsigned char **cpp;
+ unsigned int n;
+
+ for (cpp = dnptrs; cpp < lastdnptr; cpp++)
+ {
+ sp = *cpp;
+ /* Terminate search on: root label, compression pointer, unusable
+ offset. */
+ while (*sp != 0 && (*sp & NS_CMPRSFLGS) == 0 && (sp - msg) < 0x4000)
+ {
+ dn = domain;
+ cp = sp;
+ while ((n = *cp++) != 0)
+ {
+ /* Check for indirection. */
+ switch (n & NS_CMPRSFLGS)
+ {
+ case 0: /* Normal case, n == len. */
+ if (n != *dn++)
+ goto next;
+
+ for (; n > 0; n--)
+ if (mklower (*dn++) != mklower (*cp++))
+ goto next;
+ /* Is next root for both? */
+ if (*dn == '\0' && *cp == '\0')
+ return sp - msg;
+ if (*dn)
+ continue;
+ goto next;
+ case NS_CMPRSFLGS: /* Indirection. */
+ cp = msg + (((n & 0x3f) << 8) | *cp);
+ break;
+
+ default: /* Illegal type. */
+ __set_errno (EMSGSIZE);
+ return -1;
+ }
+ }
+ next: ;
+ sp += *sp + 1;
+ }
+ }
+ __set_errno (ENOENT);
+ return -1;
+}
+
+/* Packs domain name SRC into DST. Returns size of the compressed
+ name, or -1.
+
+ DNPTRS is an array of pointers to previous compressed names.
+ DNPTRS[0] is a pointer to the beginning of the message. The array
+ ends with NULL. LASTDNPTR is a pointer to the end of the array
+ pointed to by 'dnptrs'.
+
+ The list of pointers in DNPTRS is updated for labels inserted into
+ the message as we compress the name. If DNPTRS is NULL, we don't
+ try to compress names. If LASTDNPTR is NULL, we don't update the
+ list. */
+int
+___ns_name_pack (const unsigned char *src, unsigned char *dst, int dstsiz,
+ const unsigned char **dnptrs, const unsigned char **lastdnptr)
+{
+ unsigned char *dstp;
+ const unsigned char **cpp, **lpp, *eob, *msg;
+ const unsigned char *srcp;
+ int n, l, first = 1;
+
+ srcp = src;
+ dstp = dst;
+ eob = dstp + dstsiz;
+ lpp = cpp = NULL;
+ if (dnptrs != NULL)
+ {
+ if ((msg = *dnptrs++) != NULL)
+ {
+ for (cpp = dnptrs; *cpp != NULL; cpp++)
+ ;
+ lpp = cpp; /* End of list to search. */
+ }
+ }
+ else
+ msg = NULL;
+
+ /* Make sure the domain we are about to add is legal. */
+ l = 0;
+ do
+ {
+ n = *srcp;
+ if (n >= 64)
+ {
+ __set_errno (EMSGSIZE);
+ return -1;
+ }
+ l += n + 1;
+ if (l > MAXCDNAME)
+ {
+ __set_errno (EMSGSIZE);
+ return -1;
+ }
+ srcp += n + 1;
+ }
+ while (n != 0);
+
+ /* from here on we need to reset compression pointer array on error */
+ srcp = src;
+ do
+ {
+ /* Look to see if we can use pointers. */
+ n = *srcp;
+ if (n != 0 && msg != NULL)
+ {
+ l = dn_find (srcp, msg, dnptrs, lpp);
+ if (l >= 0)
+ {
+ if (eob - dstp <= 1)
+ goto cleanup;
+ *dstp++ = (l >> 8) | NS_CMPRSFLGS;
+ *dstp++ = l % 256;
+ return dstp - dst;
+ }
+ /* Not found, save it. */
+ if (lastdnptr != NULL && cpp < lastdnptr - 1
+ && (dstp - msg) < 0x4000 && first)
+ {
+ *cpp++ = dstp;
+ *cpp = NULL;
+ first = 0;
+ }
+ }
+ /* Copy label to buffer. */
+ if (n >= 64)
+ /* Should not happen. */
+ goto cleanup;
+ if (n + 1 > eob - dstp)
+ goto cleanup;
+ memcpy (dstp, srcp, n + 1);
+ srcp += n + 1;
+ dstp += n + 1;
+ }
+ while (n != 0);
+
+ if (dstp > eob)
+ {
+ cleanup:
+ if (msg != NULL)
+ *lpp = NULL;
+ __set_errno (EMSGSIZE);
+ return -1;
+ }
+ return dstp - dst;
+}
+versioned_symbol (libc, ___ns_name_pack, ns_name_pack, GLIBC_2_34);
+versioned_symbol (libc, ___ns_name_pack, __ns_name_pack, GLIBC_PRIVATE);
+libc_hidden_ver (___ns_name_pack, __ns_name_pack)
+
+#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34)
+compat_symbol (libresolv, ___ns_name_pack, ns_name_pack, GLIBC_2_9);
+#endif
generated by cgit v1.1 at 2024-10-31 17:49:44 +0000