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dns: Make reading resolv.conf more robust.

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* dirmngr/dns.c (dns_resconf_loadfile): Skip "search" which
begins with '.'.

--

GnuPG-bug-id: 5657
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2021-10-15 10:49:33 +09:00
parent fb26e144ad
commit 48359c7232
1 changed files with 6 additions and 1 deletions
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5
dirmngr/dns.c
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@ -5657,7 +5657,12 @@ skip:
memset(resconf->search, '\0', sizeof resconf->search); memset(resconf->search, '\0', sizeof resconf->search);
for (i = 1, j = 0; i < wc && j < lengthof(resconf->search); i++, j++) for (i = 1, j = 0; i < wc && j < lengthof(resconf->search); i++, j++)
if (words[i][0] == '.') {
/* Ignore invalid search spec. */
j--;
} else {
dns_d_anchor(resconf->search[j], sizeof resconf->search[j], words[i], strlen(words[i])); dns_d_anchor(resconf->search[j], sizeof resconf->search[j], words[i], strlen(words[i]));
}
break; break;
case DNS_RESCONF_LOOKUP: case DNS_RESCONF_LOOKUP: