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dirmngr: Do a DNS lookup even if it is missing from nsswitch.conf.

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* dirmngr/dns-stuff.c (libdns_init): Do not print error message for a
missing nsswitch.conf.  Make sure that tehre is a DNS entry.
--

GnuPG-bug-id: 2948
Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2017-02-13 20:09:26 +01:00
parent 30dac0486b
commit dee026d761
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 21 additions and 6 deletions
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27
dirmngr/dns-stuff.c
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@ -498,12 +498,10 @@ libdns_init (void)
(dns_nssconf_loadpath (ld.resolv_conf, fname));
if (err)
{
log_error ("failed to load '%s': %s\n", fname, gpg_strerror (err));
/* not fatal, nsswitch.conf is not used on all systems; assume
* classic behavior instead. Our dns library states "bf" which tries
* DNS then Files, which is not classic; FreeBSD
* /usr/src/lib/libc/net/gethostnamadr.c defines default_src[] which
* is Files then DNS, which is. */
/* This is not a fatal error: nsswitch.conf is not used on
* all systems; assume classic behavior instead. */
if (gpg_err_code (err) != GPG_ERR_ENOENT)
log_error ("failed to load '%s': %s\n", fname, gpg_strerror (err));
if (opt_debug)
log_debug ("dns: fallback resolution order, files then DNS\n");
ld.resolv_conf->lookup[0] = 'f';
@ -511,6 +509,23 @@ libdns_init (void)
ld.resolv_conf->lookup[2] = '\0';
err = GPG_ERR_NO_ERROR;
}
else if (!strchr (ld.resolv_conf->lookup, 'b'))
{
/* No DNS resulution type found in the list. This might be
* due to systemd based systems which allow for custom
* keywords which are not known to us and thus we do not
* know whether DNS is wanted or not. Becuase DNS is
* important for our infrastructure, we forcefully append
* DNS to the end of the list. */
if (strlen (ld.resolv_conf->lookup)+2 < sizeof ld.resolv_conf->lookup)
{
if (opt_debug)
log_debug ("dns: appending DNS to resolution order\n");
strcat (ld.resolv_conf->lookup, "b");
}
else
log_error ("failed to append DNS to resolution order\n");
}
#endif /* Unix */
}