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$Id$
--- fetchmail-6.3.9.orig/mxget.c 2007-06-10 10:32:47.000000000 +0200
+++ fetchmail-6.3.9/mxget.c 2009-06-12 22:24:29.000000000 +0200
@@ -56,6 +56,123 @@
/* minimum possible size of MX record in packet */
#define MIN_MX_SIZE 8 /* corresp to "a.com 0" w/ terminating space */
+/* from bind9 package: */
+/*
+Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
+Copyright (C) 1996-2003 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.
+
+$Id: COPYRIGHT,v 1.9.18.3 2007/01/08 02:41:59 marka Exp $
+
+Portions Copyright (C) 1996-2001 Nominum, Inc.
+
+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 NOMINUM DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM 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.
+*/
+#define NS_TYPE_ELT 0x40 /*%< EDNS0 extended label
+type
+*/
+#define NS_CMPRSFLGS 0xc0 /*%< Flag bits indicating name compression. */
+#define DNS_LABELTYPE_BITSTRING 0x41
+static int
+labellen(const u_char *lp)
+{
+ int bitlen;
+ u_char l = *lp;
+
+ if ((l & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
+ /* should be avoided by the caller */
+ 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(-1); /*%< unknwon ELT */
+ }
+ return(l);
+}
+/*%
+ * Advance *ptrptr to skip over the compressed name it points at.
+ *
+ * return:
+ *\li 0 on success, -1 (with errno set) on failure.
+ */
+int
+ns_name_skip(const u_char **ptrptr, const u_char *eom)
+{
+ const u_char *cp;
+ u_int n;
+ int l;
+
+ cp = *ptrptr;
+ while (cp < eom && (n = *cp++) != 0) {
+ /* Check for indirection. */
+ switch (n & NS_CMPRSFLGS) {
+ case 0: /*%< normal case, n == len */
+ cp += n;
+ continue;
+ case NS_TYPE_ELT: /*%< EDNS0 extended label */
+ if ((l = labellen(cp - 1)) < 0) {
+// errno = EMSGSIZE; /*%< XXX */
+ return(-1);
+ }
+ cp += l;
+ continue;
+ case NS_CMPRSFLGS: /*%< indirection */
+ cp++;
+ break;
+ default: /*%< illegal type */
+// errno = EMSGSIZE;
+ return (-1);
+ }
+ break;
+ }
+ if (cp > eom) {
+// errno = EMSGSIZE;
+ return (-1);
+ }
+ *ptrptr = cp;
+ return (0);
+}
+
+/*%
+ * Skip over a compressed domain name. Return the size or -1.
+ */
+int
+dn_skipname(const u_char *ptr, const u_char *eom) {
+ const u_char *saveptr = ptr;
+
+ if (ns_name_skip(&ptr, eom) == -1)
+ return (-1);
+ return (ptr - saveptr);
+}
+/* End from Bind9 package */
+
+
struct mxentry *getmxrecords(const char *name)
/* get MX records for given host */
{
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