114 lines
3.3 KiB
Diff
114 lines
3.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: bradh352 <brad@brad-house.com>
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Date: Fri, 11 Jun 2021 12:39:24 -0400
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Subject: [PATCH] ares_expand_name(): fix formatting and handling of root name
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response
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Fixes issue introduced in prior commit with formatting and handling
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of parsing a root name response which should not be escaped.
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Fix By: Brad House
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[rebased onto 1.15.0]
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Signed-off-by: Petr Štetiar <ynezz@true.cz>
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---
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ares_expand_name.c | 62 ++++++++++++++++++++++++++++++----------------
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1 file changed, 40 insertions(+), 22 deletions(-)
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diff --git a/ares_expand_name.c b/ares_expand_name.c
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index 8604543fc39d..f89ee3f7a602 100644
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--- a/ares_expand_name.c
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+++ b/ares_expand_name.c
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@@ -133,27 +133,37 @@ int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
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}
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else
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{
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- len = *p;
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+ int name_len = *p;
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+ len = name_len;
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p++;
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+
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while (len--)
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{
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- if (!isprint(*p)) {
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- /* Output as \DDD for consistency with RFC1035 5.1 */
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- *q++ = '\\';
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- *q++ = '0' + *p / 100;
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- *q++ = '0' + (*p % 100) / 10;
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- *q++ = '0' + (*p % 10);
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- } else if (is_reservedch(*p)) {
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- *q++ = '\\';
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- *q++ = *p;
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- } else {
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- *q++ = *p;
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- }
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+ /* Output as \DDD for consistency with RFC1035 5.1, except
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+ * for the special case of a root name response */
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+ if (!isprint(*p) && !(name_len == 1 && *p == 0))
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+ {
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+
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+ *q++ = '\\';
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+ *q++ = '0' + *p / 100;
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+ *q++ = '0' + (*p % 100) / 10;
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+ *q++ = '0' + (*p % 10);
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+ }
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+ else if (is_reservedch(*p))
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+ {
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+ *q++ = '\\';
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+ *q++ = *p;
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+ }
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+ else
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+ {
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+ *q++ = *p;
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+ }
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p++;
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}
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*q++ = '.';
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}
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- }
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+ }
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+
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if (!indir)
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*enclen = aresx_uztosl(p + 1U - encoded);
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@@ -200,21 +210,29 @@ static int name_length(const unsigned char *encoded, const unsigned char *abuf,
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}
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else if (top == 0x00)
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{
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- offset = *encoded;
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+ int name_len = *encoded;
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+ offset = name_len;
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if (encoded + offset + 1 >= abuf + alen)
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return -1;
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encoded++;
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+
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while (offset--)
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{
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- if (!isprint(*encoded)) {
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- n += 4;
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- } else if (is_reservedch(*encoded)) {
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- n += 2;
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- } else {
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- n += 1;
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- }
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+ if (!isprint(*encoded) && !(name_len == 1 && *encoded == 0))
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+ {
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+ n += 4;
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+ }
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+ else if (is_reservedch(*encoded))
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+ {
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+ n += 2;
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+ }
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+ else
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+ {
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+ n += 1;
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+ }
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encoded++;
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}
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+
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n++;
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}
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else
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