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dirmngr: Do not block during ADNS calls.

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* dirmngr/dns-stuff.c: Include npth.h
(my_unprotect, my_protect): New wrapper.
(resolve_name_adns): Put unprotect/protect around adns calls.
(get_dns_cert): Ditto.
(getsrv): Ditto.
(get_dns_cname): Ditto.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2015-11-12 13:31:59 +01:00
parent a2cc1d5755
commit a3b26d6c08
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
2 changed files with 36 additions and 8 deletions
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1
dirmngr/Makefile.am
View File

@ -142,6 +142,7 @@ t_ldap_parse_uri_SOURCES = \
t_ldap_parse_uri_CFLAGS = -DWITHOUT_NPTH=1
t_ldap_parse_uri_LDADD = $(ldaplibs) $(t_common_ldadd) $(DNSLIBS)
t_dns_stuff_CFLAGS = -DWITHOUT_NPTH=1
t_dns_stuff_SOURCES = t-dns-stuff.c dns-stuff.c
t_dns_stuff_LDADD = $(t_common_ldadd) $(DNSLIBS)

35
dirmngr/dns-stuff.c
View File

@ -51,10 +51,25 @@
# error Either getaddrinfo or the ADNS libary is required.
#endif
#ifdef WITHOUT_NPTH /* Give the Makefile a chance to build without Pth. */
# undef USE_NPTH
#endif
#ifdef USE_NPTH
# include <npth.h>
#endif
#include "util.h"
#include "host2net.h"
#include "dns-stuff.h"
#ifdef USE_NPTH
# define my_unprotect() npth_unprotect ()
# define my_protect() npth_protect ()
#else
# define my_unprotect() do { } while(0)
# define my_protect() do { } while(0)
#endif
/* We allow the use of 0 instead of AF_UNSPEC - check this assumption. */
#if AF_UNSPEC != 0
# error AF_UNSPEC does not have the value 0
@ -231,6 +246,7 @@ resolve_name_adns (const char *name, unsigned short port,
dns_addrinfo_t *r_dai, char **r_canonname)
{
gpg_error_t err = 0;
int ret;
dns_addrinfo_t daihead = NULL;
dns_addrinfo_t dai;
adns_state state;
@ -251,8 +267,11 @@ resolve_name_adns (const char *name, unsigned short port,
if (err)
return err;
if (adns_synchronous (state, name, adns_r_addr,
adns_qf_quoteok_query, &answer))
my_unprotect ();
ret = adns_synchronous (state, name, adns_r_addr,
adns_qf_quoteok_query, &answer);
my_protect ();
if (ret)
{
err = gpg_error_from_syserror ();
log_error ("DNS query failed: %s\n", gpg_strerror (err));
@ -629,6 +648,7 @@ get_dns_cert (const char *name, int want_certtype,
#ifdef USE_DNS_CERT
#ifdef USE_ADNS
gpg_error_t err;
int ret;
adns_state state;
adns_answer *answer = NULL;
unsigned int ctype;
@ -646,12 +666,15 @@ get_dns_cert (const char *name, int want_certtype,
if (err)
return err;
if (adns_synchronous (state, name,
my_unprotect ();
ret = adns_synchronous (state, name,
(adns_r_unknown
| (want_certtype < DNS_CERTTYPE_RRBASE
? my_adns_r_cert
: (want_certtype - DNS_CERTTYPE_RRBASE))),
adns_qf_quoteok_query, &answer))
adns_qf_quoteok_query, &answer);
my_protect ();
if (ret)
{
err = gpg_error_from_syserror ();
/* log_error ("DNS query failed: %s\n", strerror (errno)); */
@ -1001,8 +1024,10 @@ getsrv (const char *name,struct srventry **list)
if (my_adns_init (&state))
return -1;
my_unprotect ();
rc = adns_synchronous (state, name, adns_r_srv, adns_qf_quoteok_query,
&answer);
my_protect ();
if (rc)
{
log_error ("DNS query failed: %s\n", strerror (errno));
@ -1241,8 +1266,10 @@ get_dns_cname (const char *name, char **r_cname)
if (my_adns_init (&state))
return gpg_error (GPG_ERR_GENERAL);
my_unprotect ();
rc = adns_synchronous (state, name, adns_r_cname, adns_qf_quoteok_query,
&answer);
my_protect ();
if (rc)
{
err = gpg_error_from_syserror ();