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More lenient IDNA processing in dig

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If there are any problems with IDN processing, DiG will now quietly
handle the name as if IDN were disabled. This means that international
query names are rendered verbatim on the wire, and ACE names are
printed raw without conversion to UTF8.

If you want to check the syntax of international domain names,
use the `idn2` utility.
This commit is contained in:
Tony Finch
2022-09-05 15:49:49 +01:00
parent 8b9dba53dd
commit f820ef49bf
5 changed files with 141 additions and 288 deletions
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45
bin/dig/dig.c
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@@ -235,10 +235,8 @@ help(void) {
" +[no]identify (ID responders in short "
"answers)\n"
#ifdef HAVE_LIBIDN2
" +[no]idnin (Parse IDN names "
"[default=on on tty])\n"
" +[no]idnout (Convert IDN response "
"[default=on on tty])\n"
" +[no]idn (convert international "
"domain names)\n"
#endif /* ifdef HAVE_LIBIDN2 */
" +[no]ignore (Don't revert to TCP for "
"TC responses.)\n"
@@ -1615,7 +1613,7 @@ plus_option(char *option, bool is_batchfile, bool *need_clone,
break;
case 'i':
switch (cmd[1]) {
case 'd': /* identify */
case 'd':
switch (cmd[2]) {
case 'e':
FULLCHECK("identify");
@@ -1623,33 +1621,28 @@ plus_option(char *option, bool is_batchfile, bool *need_clone,
break;
case 'n':
switch (cmd[3]) {
case 'i':
FULLCHECK("idnin");
#ifndef HAVE_LIBIDN2
if (state) {
fprintf(stderr,
";; IDN input support"
" not enabled\n");
}
#else /* ifndef HAVE_LIBIDN2 */
case '\0':
FULLCHECK("idn");
lookup->idnin = state;
#endif /* ifndef HAVE_LIBIDN2 */
break;
case 'o':
FULLCHECK("idnout");
#ifndef HAVE_LIBIDN2
if (state) {
fprintf(stderr,
";; IDN output support"
" not enabled\n");
}
#else /* ifndef HAVE_LIBIDN2 */
lookup->idnout = state;
#endif /* ifndef HAVE_LIBIDN2 */
break;
case 'i': /* (compat) */
FULLCHECK("idnin");
lookup->idnin = state;
break;
case 'o': /* (compat) */
FULLCHECK("idnout");
lookup->idnout = state;
break;
default:
goto invalid_option;
}
#ifndef HAVE_LIBIDN2
if (state) {
printf(";; IDN support "
"is not available\n");
}
#endif /* ifndef HAVE_LIBIDN2 */
break;
default:
goto invalid_option;