dirmngr: Serialize access to hosttable.

* dirmngr/dirmngr.h (ks_hkp_init): New.
* dirmngr/dirmngr.c (main): Call ks_hkp_init.
* dirmngr/ks-engine-hkp.c (ks_hkp_init): New.
(ks_hkp_mark_host): Serialize access to hosttable.
(ks_hkp_print_hosttable, make_host_part): Likewise.
(ks_hkp_housekeeping, ks_hkp_reload): Likewise.

--

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

dirmngr/dirmngr.c

@@ -1143,6 +1143,7 @@ main (int argc, char **argv)
       thread_init ();
       cert_cache_init (hkp_cacert_filenames);
       crl_cache_init ();
+      ks_hkp_init ();
       http_register_netactivity_cb (netactivity_action);
       start_command_handler (ASSUAN_INVALID_FD, 0);
       shutdown_reaper ();
@@ -1178,6 +1179,7 @@ main (int argc, char **argv)
       thread_init ();
       cert_cache_init (hkp_cacert_filenames);
       crl_cache_init ();
+      ks_hkp_init ();
       http_register_netactivity_cb (netactivity_action);
       handle_connections (3);
       shutdown_reaper ();
@@ -1399,6 +1401,7 @@ main (int argc, char **argv)
       thread_init ();
       cert_cache_init (hkp_cacert_filenames);
       crl_cache_init ();
+      ks_hkp_init ();
       http_register_netactivity_cb (netactivity_action);
       handle_connections (fd);
       shutdown_reaper ();
@@ -1421,6 +1424,7 @@ main (int argc, char **argv)
       thread_init ();
       cert_cache_init (hkp_cacert_filenames);
       crl_cache_init ();
+      ks_hkp_init ();
       if (!argc)
         rc = crl_cache_load (&ctrlbuf, NULL);
       else
@@ -1444,6 +1448,7 @@ main (int argc, char **argv)
       thread_init ();
       cert_cache_init (hkp_cacert_filenames);
       crl_cache_init ();
+      ks_hkp_init ();
       rc = crl_fetch (&ctrlbuf, argv[0], &reader);
       if (rc)
         log_error (_("fetching CRL from '%s' failed: %s\n"),

dirmngr/dirmngr.h

@@ -218,7 +218,7 @@ int dirmngr_use_tor (void);
 /*-- Various housekeeping functions.  --*/
 void ks_hkp_housekeeping (time_t curtime);
 void ks_hkp_reload (void);
-
+void ks_hkp_init (void);
 
 /*-- server.c --*/
 ldap_server_t get_ldapservers_from_ctrl (ctrl_t ctrl);

dirmngr/ks-engine-hkp.c

@@ -35,6 +35,7 @@
 # include <netdb.h>
 #endif /*!HAVE_W32_SYSTEM*/
 
+#include <npth.h>
 #include "dirmngr.h"
 #include "misc.h"
 #include "../common/userids.h"
@@ -108,6 +109,8 @@ struct hostinfo_s
    resolved from a pool name and its allocated size.*/
 static hostinfo_t *hosttable;
 static int hosttable_size;
+/* A mutex used to serialize access to the hosttable. */
+static npth_mutex_t hosttable_lock;
 
 /* The number of host slots we initially allocate for HOSTTABLE.  */
 #define INITIAL_HOSTTABLE_SIZE 50
@@ -753,9 +756,15 @@ ks_hkp_mark_host (ctrl_t ctrl, const char *name, int alive)
   if (!name || !*name || !strcmp (name, "localhost"))
     return 0;
 
+  if (npth_mutex_lock (&hosttable_lock))
+    log_fatal ("failed to acquire mutex\n");
+
   idx = find_hostinfo (name);
   if (idx == -1)
-    return gpg_error (GPG_ERR_NOT_FOUND);
+    {
+      err = gpg_error (GPG_ERR_NOT_FOUND);
+      goto leave;
+    }
 
   hi = hosttable[idx];
   if (alive && hi->dead)
@@ -814,6 +823,10 @@ ks_hkp_mark_host (ctrl_t ctrl, const char *name, int alive)
         }
     }
 
+ leave:
+  if (npth_mutex_unlock (&hosttable_lock))
+    log_fatal ("failed to release mutex\n");
+
   return err;
 }
 
@@ -834,7 +847,9 @@ ks_hkp_print_hosttable (ctrl_t ctrl)
   if (err)
     return err;
 
-  /* FIXME: We need a lock for the hosttable.  */
+  if (npth_mutex_lock (&hosttable_lock))
+    log_fatal ("failed to acquire mutex\n");
+
   curtime = gnupg_get_time ();
   for (idx=0; idx < hosttable_size; idx++)
     if ((hi=hosttable[idx]))
@@ -927,12 +942,12 @@ ks_hkp_print_hosttable (ctrl_t ctrl)
                               diedstr? ")":""   );
         xfree (died);
         if (err)
-          return err;
+	  goto leave;
 
         if (hi->cname)
           err = ks_printf_help (ctrl, "  .       %s", hi->cname);
         if (err)
-          return err;
+	  goto leave;
 
         if (hi->pool)
           {
@@ -947,14 +962,21 @@ ks_hkp_print_hosttable (ctrl_t ctrl)
             put_membuf( &mb, "", 1);
             p = get_membuf (&mb, NULL);
             if (!p)
-              return gpg_error_from_syserror ();
+	      {
+		err = gpg_error_from_syserror ();
+		goto leave;
+	      }
             err = ks_print_help (ctrl, p);
             xfree (p);
             if (err)
-              return err;
+              goto leave;
           }
       }
-  return 0;
+
+ leave:
+  if (npth_mutex_unlock (&hosttable_lock))
+    log_fatal ("failed to release mutex\n");
+  return err;
 }
 
 
@@ -1023,9 +1045,16 @@ make_host_part (ctrl_t ctrl,
       protocol = KS_PROTOCOL_HKP;
     }
 
+  if (npth_mutex_lock (&hosttable_lock))
+    log_fatal ("failed to acquire mutex\n");
+
   portstr[0] = 0;
   err = map_host (ctrl, host, srvtag, force_reselect, protocol,
                   &hostname, portstr, r_httpflags, r_httphost);
+
+  if (npth_mutex_unlock (&hosttable_lock))
+    log_fatal ("failed to release mutex\n");
+
   if (err)
     return err;
 
@@ -1099,6 +1128,9 @@ ks_hkp_housekeeping (time_t curtime)
   int idx;
   hostinfo_t hi;
 
+  if (npth_mutex_lock (&hosttable_lock))
+    log_fatal ("failed to acquire mutex\n");
+
   for (idx=0; idx < hosttable_size; idx++)
     {
       hi = hosttable[idx];
@@ -1115,6 +1147,9 @@ ks_hkp_housekeeping (time_t curtime)
           log_info ("resurrected host '%s'", hi->name);
         }
     }
+
+  if (npth_mutex_unlock (&hosttable_lock))
+    log_fatal ("failed to release mutex\n");
 }
 
 
@@ -1126,6 +1161,9 @@ ks_hkp_reload (void)
   int idx, count;
   hostinfo_t hi;
 
+  if (npth_mutex_lock (&hosttable_lock))
+    log_fatal ("failed to acquire mutex\n");
+
   for (idx=count=0; idx < hosttable_size; idx++)
     {
       hi = hosttable[idx];
@@ -1139,6 +1177,9 @@ ks_hkp_reload (void)
     }
   if (count)
     log_info ("number of resurrected hosts: %d", count);
+
+  if (npth_mutex_unlock (&hosttable_lock))
+    log_fatal ("failed to release mutex\n");
 }
 
 
@@ -1754,3 +1795,13 @@ ks_hkp_put (ctrl_t ctrl, parsed_uri_t uri, const void *data, size_t datalen)
   xfree (httphost);
   return err;
 }
+
+void
+ks_hkp_init (void)
+{
+  int err;
+
+  err = npth_mutex_init (&hosttable_lock, NULL);
+  if (err)
+    log_fatal ("error initializing mutex: %s\n", strerror (err));
+}