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dirmngr: Add a background task framework.

Browse Source 
* dirmngr/workqueue.c: New.
* dirmngr/Makefile.am (dirmngr_SOURCES): Add new file.
* dirmngr/server.c (server_local_s): New field session_id.
(cmd_wkd_get): Add a task.
(task_check_wkd_support): New stub function.
(cmd_getinfo): New sub-commands "session_id" and "workqueue".
(start_command_handler): Add arg session_id and store it in
SERVER_LOCAL.
(dirmngr_status_helpf): New.
* dirmngr/dirmngr.h (wqtask_t): New type.
* dirmngr/dirmngr.c (main): Pass 0 as session_id to
start_command_handler.
(start_connection_thread): Introduce a session_id and pass it to
start_command_handler.  Run post session tasks.
(housekeeping_thread): Run global workqueue tasks.
--

Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 96a4fbecd1acf946dcde20bef4752c539dae196b)
This commit is contained in:
Werner Koch 2017-11-14 13:42:18 +01:00
parent 7a663c296e
commit f2997adee0
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
5 changed files with 305 additions and 12 deletions
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1
dirmngr/Makefile.am
View File

@ -60,6 +60,7 @@ noinst_HEADERS = dirmngr.h crlcache.h crlfetch.h misc.h
dirmngr_SOURCES = dirmngr.c dirmngr.h server.c crlcache.c crlfetch.c \
certcache.c certcache.h \
domaininfo.c \
workqueue.c \
loadswdb.c \
cdb.h cdblib.c misc.c dirmngr-err.h \
ocsp.c ocsp.h validate.c validate.h \

14
dirmngr/dirmngr.c
View File

@ -1134,7 +1134,7 @@ main (int argc, char **argv)
cert_cache_init (hkp_cacert_filenames);
crl_cache_init ();
http_register_netactivity_cb (netactivity_action);
start_command_handler (ASSUAN_INVALID_FD);
start_command_handler (ASSUAN_INVALID_FD, 0);
shutdown_reaper ();
}
#ifndef HAVE_W32_SYSTEM
@ -1939,7 +1939,10 @@ housekeeping_thread (void *arg)
network_activity_seen = 0;
if (opt.allow_version_check)
dirmngr_load_swdb (&ctrlbuf, 0);
workqueue_run_global_tasks (&ctrlbuf, 1);
}
else
workqueue_run_global_tasks (&ctrlbuf, 0);
dirmngr_deinit_default_ctrl (&ctrlbuf);
@ -2034,6 +2037,8 @@ check_nonce (assuan_fd_t fd, assuan_sock_nonce_t *nonce)
static void *
start_connection_thread (void *arg)
{
static unsigned int last_session_id;
unsigned int session_id;
union int_and_ptr_u argval;
gnupg_fd_t fd;
@ -2055,12 +2060,17 @@ start_connection_thread (void *arg)
if (opt.verbose)
log_info (_("handler for fd %d started\n"), FD2INT (fd));
start_command_handler (fd);
session_id = ++last_session_id;
if (!session_id)
session_id = ++last_session_id;
start_command_handler (fd, session_id);
if (opt.verbose)
log_info (_("handler for fd %d terminated\n"), FD2INT (fd));
active_connections--;
workqueue_run_post_session_tasks (session_id);
#ifndef HAVE_W32_SYSTEM
argval.afd = ASSUAN_INVALID_FD;
npth_setspecific (my_tlskey_current_fd, argval.aptr);

13
dirmngr/dirmngr.h
View File

@ -228,9 +228,11 @@ ksba_cert_t get_cert_local_ski (ctrl_t ctrl,
gpg_error_t get_istrusted_from_client (ctrl_t ctrl, const char *hexfpr);
int dirmngr_assuan_log_monitor (assuan_context_t ctx, unsigned int cat,
const char *msg);
void start_command_handler (gnupg_fd_t fd);
void start_command_handler (gnupg_fd_t fd, unsigned int session_id);
gpg_error_t dirmngr_status (ctrl_t ctrl, const char *keyword, ...);
gpg_error_t dirmngr_status_help (ctrl_t ctrl, const char *text);
gpg_error_t dirmngr_status_helpf (ctrl_t ctrl, const char *format,
...) GPGRT_ATTR_PRINTF(2,3);
gpg_error_t dirmngr_status_printf (ctrl_t ctrl, const char *keyword,
const char *format,
...) GPGRT_ATTR_PRINTF(3,4);
@ -258,6 +260,15 @@ void domaininfo_set_wkd_supported (const char *domain);
void domaininfo_set_wkd_not_supported (const char *domain);
void domaininfo_set_wkd_not_found (const char *domain);
/*-- workqueue.c --*/
typedef const char *(*wqtask_t)(ctrl_t ctrl, const char *args);
void workqueue_dump_queue (ctrl_t ctrl);
gpg_error_t workqueue_add_task (wqtask_t func, const char *args,
unsigned int session_id, int need_network);
void workqueue_run_global_tasks (ctrl_t ctrl, int with_network);
void workqueue_run_post_session_tasks (unsigned int session_id);
#endif /*DIRMNGR_H*/

75
dirmngr/server.c
View File

@ -90,6 +90,9 @@ struct server_local_s
/* Data used to associate an Assuan context with local server data */
assuan_context_t assuan_ctx;
/* The session id (a counter). */
unsigned int session_id;
/* Per-session LDAP servers. */
ldap_server_t ldapservers;
@ -125,6 +128,9 @@ static es_cookie_io_functions_t data_line_cookie_functions =
};
/* Local prototypes */
static const char *task_check_wkd_support (ctrl_t ctrl, const char *domain);
@ -992,8 +998,12 @@ cmd_wkd_get (assuan_context_t ctx, char *line)
break;
case GPG_ERR_NO_DATA:
if (is_wkd_query) /* Mark that - we will latter do a check. */
domaininfo_set_wkd_not_found (domain_orig);
if (is_wkd_query) /* Mark that and schedule a check. */
{
domaininfo_set_wkd_not_found (domain_orig);
workqueue_add_task (task_check_wkd_support, domain_orig,
ctrl->server_local->session_id, 1);
}
else if (opt_policy_flags) /* No policy file - no support. */
domaininfo_set_wkd_not_supported (domain_orig);
break;
@ -1014,6 +1024,20 @@ cmd_wkd_get (assuan_context_t ctx, char *line)
}
/* A task to check whether DOMAIN supports WKD. This is done by
* checking whether the policy flags file can be read. */
static const char *
task_check_wkd_support (ctrl_t ctrl, const char *domain)
{
if (!ctrl || !domain)
return "check_wkd_support";
log_debug ("FIXME: Implement %s\n", __func__);
return NULL;
}
static const char hlp_ldapserver[] =
"LDAPSERVER <data>\n"
@ -2428,12 +2452,15 @@ static const char hlp_getinfo[] =
"pid - Return the process id of the server.\n"
"tor - Return OK if running in Tor mode\n"
"dnsinfo - Return info about the DNS resolver\n"
"socket_name - Return the name of the socket.\n";
"socket_name - Return the name of the socket.\n"
"session_id - Return the current session_id.\n"
"workqueue - Inspect the work queue\n";
static gpg_error_t
cmd_getinfo (assuan_context_t ctx, char *line)
{
ctrl_t ctrl = assuan_get_pointer (ctx);
gpg_error_t err;
char numbuf[50];
if (!strcmp (line, "version"))
{
@ -2442,8 +2469,6 @@ cmd_getinfo (assuan_context_t ctx, char *line)
}
else if (!strcmp (line, "pid"))
{
char numbuf[50];
snprintf (numbuf, sizeof numbuf, "%lu", (unsigned long)getpid ());
err = assuan_send_data (ctx, numbuf, strlen (numbuf));
}
@ -2452,6 +2477,11 @@ cmd_getinfo (assuan_context_t ctx, char *line)
const char *s = dirmngr_get_current_socket_name ();
err = assuan_send_data (ctx, s, strlen (s));
}
else if (!strcmp (line, "session_id"))
{
snprintf (numbuf, sizeof numbuf, "%u", ctrl->server_local->session_id);
err = assuan_send_data (ctx, numbuf, strlen (numbuf));
}
else if (!strcmp (line, "tor"))
{
int use_tor;
@ -2487,6 +2517,11 @@ cmd_getinfo (assuan_context_t ctx, char *line)
}
err = 0;
}
else if (!strcmp (line, "workqueue"))
{
workqueue_dump_queue (ctrl);
err = 0;
}
else
err = set_error (GPG_ERR_ASS_PARAMETER, "unknown value for WHAT");
@ -2614,9 +2649,10 @@ dirmngr_assuan_log_monitor (assuan_context_t ctx, unsigned int cat,
/* Startup the server and run the main command loop. With FD = -1,
use stdin/stdout. */
* use stdin/stdout. SESSION_ID is either 0 or a unique number
* identifying a session. */
void
start_command_handler (assuan_fd_t fd)
start_command_handler (assuan_fd_t fd, unsigned int session_id)
{
static const char hello[] = "Dirmngr " VERSION " at your service";
static char *hello_line;
@ -2693,6 +2729,8 @@ start_command_handler (assuan_fd_t fd)
assuan_register_option_handler (ctx, option_handler);
assuan_register_reset_notify (ctx, reset_notify);
ctrl->server_local->session_id = session_id;
for (;;)
{
rc = assuan_accept (ctx);
@ -2792,8 +2830,7 @@ dirmngr_status (ctrl_t ctrl, const char *keyword, ...)
}
/* Print a help status line. TEXTLEN gives the length of the text
from TEXT to be printed. The function splits text at LFs. */
/* Print a help status line. The function splits text at LFs. */
gpg_error_t
dirmngr_status_help (ctrl_t ctrl, const char *text)
{
@ -2823,6 +2860,26 @@ dirmngr_status_help (ctrl_t ctrl, const char *text)
}
/* Print a help status line using a printf like format. The function
* splits text at LFs. */
gpg_error_t
dirmngr_status_helpf (ctrl_t ctrl, const char *format, ...)
{
va_list arg_ptr;
gpg_error_t err;
char *buf;
va_start (arg_ptr, format);
buf = es_vbsprintf (format, arg_ptr);
err = buf? 0 : gpg_error_from_syserror ();
va_end (arg_ptr);
if (!err)
err = dirmngr_status_help (ctrl, buf);
es_free (buf);
return err;
}
/* This function is similar to print_assuan_status but takes a CTRL
* arg instead of an assuan context as first argument. */
gpg_error_t

214
dirmngr/workqueue.c Normal file
View File

@ -0,0 +1,214 @@
/* workqueue.c - Maintain a queue of background tasks
* Copyright (C) 2017 Werner Koch
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: GPL-3.0+
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include "dirmngr.h"
/* An object for one item in the workqueue. */
struct wqitem_s
{
struct wqitem_s *next;
/* This flag is set if the task requires network access. */
unsigned int need_network:1;
/* The id of the session which created this task. If this is 0 the
* task is not associated with a specific session. */
unsigned int session_id;
/* The function to perform the backgrount task. */
wqtask_t func;
/* A string with the string argument for that task. */
char args[1];
};
typedef struct wqitem_s *wqitem_t;
/* The workque is a simple linked list. */
static wqitem_t workqueue;
/* Dump the queue using Assuan status comments. */
void
workqueue_dump_queue (ctrl_t ctrl)
{
wqitem_t saved_workqueue;
wqitem_t item;
unsigned int count;
/* Temporay detach the entiere workqueue so that other threads don't
* get into our way. */
saved_workqueue = workqueue;
workqueue = NULL;
for (count=0, item = saved_workqueue; item; item = item->next)
count++;
dirmngr_status_helpf (ctrl, "wq: number of entries: %u", count);
for (item = saved_workqueue; item; item = item->next)
dirmngr_status_helpf (ctrl, "wq: sess=%u net=%d %s(\"%.100s%s\")",
item->session_id, item->need_network,
item->func? item->func (NULL, NULL): "nop",
item->args, strlen (item->args) > 100? "[...]":"");
/* Restore then workqueue. Actually we append the saved queue do a
* possibly updated workqueue. */
if (!(item=workqueue))
workqueue = saved_workqueue;
else
{
while (item->next)
item = item->next;
item->next = saved_workqueue;
}
}
/* Append the task (FUNC,ARGS) to the work queue. FUNC shall return
* its name when called with (NULL, NULL). */
gpg_error_t
workqueue_add_task (wqtask_t func, const char *args, unsigned int session_id,
int need_network)
{
wqitem_t item, wi;
item = xtrycalloc (1, sizeof *item + strlen (args));
if (!item)
return gpg_error_from_syserror ();
strcpy (item->args, args);
item->func = func;
item->session_id = session_id;
item->need_network = !!need_network;
if (!(wi=workqueue))
workqueue = item;
else
{
while (wi->next)
wi = wi->next;
wi->next = item;
}
return 0;
}
/* Run the task described by ITEM. ITEM must have been detached from
* the workqueue; its ownership is transferred to this fucntion. */
static void
run_a_task (ctrl_t ctrl, wqitem_t item)
{
log_assert (!item->next);
if (opt.verbose)
log_info ("session %u: running %s(\"%s%s\")\n",
item->session_id,
item->func? item->func (NULL, NULL): "nop",
item->args, strlen (item->args) > 100? "[...]":"");
if (item->func)
item->func (ctrl, item->args);
xfree (item);
}
/* Run tasks not associated with a session. This is called from the
* ticker every few minutes. If WITH_NETWORK is not set tasks which
* require the network are not run. */
void
workqueue_run_global_tasks (ctrl_t ctrl, int with_network)
{
wqitem_t item, prev;
with_network = !!with_network;
if (opt.verbose)
log_info ("running scheduled tasks%s\n", with_network?" (with network)":"");
for (;;)
{
prev = NULL;
for (item = workqueue; item; prev = item, item = item->next)
if (!item->session_id
&& (!item->need_network || (item->need_network && with_network)))
break;
if (!item)
break; /* No more tasks to run. */
/* Detach that item from the workqueue. */
if (!prev)
workqueue = item->next;
else
prev->next = item->next;
item->next = NULL;
/* Run the task. */
run_a_task (ctrl, item);
}
}
/* Run tasks scheduled for running after a session. Those tasks are
* identified by the SESSION_ID. */
void
workqueue_run_post_session_tasks (unsigned int session_id)
{
struct server_control_s ctrlbuf;
ctrl_t ctrl = NULL;
wqitem_t item, prev;
if (!session_id)
return;
for (;;)
{
prev = NULL;
for (item = workqueue; item; prev = item, item = item->next)
if (item->session_id == session_id)
break;
if (!item)
break; /* No more tasks for this session. */
/* Detach that item from the workqueue. */
if (!prev)
workqueue = item->next;
else
prev->next = item->next;
item->next = NULL;
/* Create a CTRL object the first time we need it. */
if (!ctrl)
{
memset (&ctrlbuf, 0, sizeof ctrlbuf);
ctrl = &ctrlbuf;
dirmngr_init_default_ctrl (ctrl);
}
/* Run the task. */
run_a_task (ctrl, item);
}
dirmngr_deinit_default_ctrl (ctrl);
}