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From 2eca7f5fa97a24997e4d8f900460ba43ae167e97 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Petr=20Men=C5=A1=C3=ADk?= <pemensik@redhat.com>
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Date: Tue, 29 Jan 2019 18:07:44 +0100
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Subject: [PATCH] Fallback to ASCII on output IDN conversion error
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It is possible dig used ACE encoded name in locale, which does not
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support converting it to unicode. Instead of fatal error, fallback to
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ACE name on output.
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(cherry picked from commit 7f4cb8f9584597fea16de6557124ac8b1bd47440)
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Modify idna test to fallback to ACE
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Test valid A-label on input would be displayed as A-label on output if
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locale does not allow U-label.
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(cherry picked from commit 4ce232f8605bdbe0594ebe5a71383c9d4e6f263b)
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Emit warning on IDN output failure
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Warning is emitted before any dig headers.
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(cherry picked from commit 4b410038c531fbb902cd5fb83174eed1f06cb7d7)
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---
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bin/dig/dighost.c | 15 +++++++++++++--
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bin/tests/system/idna/tests.sh | 17 +++++++++++++++++
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2 files changed, 30 insertions(+), 2 deletions(-)
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diff --git a/bin/dig/dighost.c b/bin/dig/dighost.c
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index bb8702c..d7cfc33 100644
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--- a/bin/dig/dighost.c
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+++ b/bin/dig/dighost.c
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@@ -4860,9 +4860,20 @@ idn_ace_to_locale(const char *from, char *to, size_t tolen) {
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*/
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res = idn2_to_unicode_8zlz(utf8_src, &tmp_str, 0);
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if (res != IDN2_OK) {
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- fatal("Cannot represent '%s' in the current locale (%s), "
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- "use +noidnout or a different locale",
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+ static bool warned = false;
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+
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+ res = idn2_to_ascii_8z(utf8_src, &tmp_str, 0);
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+ if (res != IDN2_OK) {
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+ fatal("Cannot represent '%s' "
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+ "in the current locale nor ascii (%s), "
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+ "use +noidnout or a different locale",
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from, idn2_strerror(res));
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+ } else if (!warned) {
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+ fprintf(stderr, ";; Warning: cannot represent '%s' "
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+ "in the current locale",
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+ tmp_str);
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+ warned = true;
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+ }
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}
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/*
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diff --git a/bin/tests/system/idna/tests.sh b/bin/tests/system/idna/tests.sh
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index 6637bf6..215a9d5 100644
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--- a/bin/tests/system/idna/tests.sh
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+++ b/bin/tests/system/idna/tests.sh
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@@ -244,6 +244,23 @@ idna_enabled_test() {
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idna_test "$text" "+idnin +noidnout" "xn--nxasmq6b.com" "xn--nxasmq6b.com."
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idna_test "$text" "+idnin +idnout" "xn--nxasmq6b.com" "βόλοσ.com."
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+ # Test of valid A-label in locale that cannot display it
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+ #
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+ # +noidnout: The string is sent as-is to the server and the returned qname
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+ # is displayed in the same form.
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+ # +idnout: The string is sent as-is to the server and the returned qname
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+ # is displayed as the corresponding A-label.
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+ #
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+ # The "+[no]idnout" flag has no effect in these cases.
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+ text="Checking valid A-label in C locale"
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+ label="xn--nxasmq6b.com"
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+ LC_ALL=C idna_test "$text" "" "$label" "$label."
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+ LC_ALL=C idna_test "$text" "+noidnin +noidnout" "$label" "$label."
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+ LC_ALL=C idna_test "$text" "+noidnin +idnout" "$label" "$label."
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+ LC_ALL=C idna_test "$text" "+idnin +noidnout" "$label" "$label."
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+ LC_ALL=C idna_test "$text" "+idnin +idnout" "$label" "$label."
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+ LC_ALL=C idna_test "$text" "+noidnin +idnout" "$label" "$label."
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+
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# Tests of invalid A-labels
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--
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2.20.1
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